Low-stress rotating pipe, low-stress rotating fire-fighting water crane and mounting method of low-stress rotating fire-fighting water crane

Abstract

The invention relates to the technical field of fire fighting, in particular to a low-stress rotating pipe, a low-stress rotating fire-fighting water crane and an installation method thereof.The low-stress rotating pipe comprises an overground conveying pipe and a water receiving pipeline which is communicated with the bottom end of the overground conveying pipe and fixedly connected with the bottom end of the overground conveying pipe; the overground conveying pipe comprises a water inlet pipe and a water outlet pipe, the water inlet pipe is communicated with the end of the water receiving pipeline and fixedly connected with the end of the water receiving pipeline, the water outlet pipe is arranged at the end of the water inlet pipe, and a low-stress rotating pipe is arranged between the top end of the water outlet pipe and the side end of the water inlet pipe. A driven fluted disc is arranged on the outer wall of the low-stress rotating pipe, a rotating device is arranged on the outer wall of the water inlet pipe, the top end of the rotating device is sleeved with a driving gear in meshed connection with the driven fluted disc, the rotating device is rotated to drive the driving gear to rotate, and rotating force is output to the low-stress rotating pipe through the driven fluted disc so that the angle of the water outlet pipe can be changed.

Description

Technical Field

[0001] The invention relates to the technical field of fire fighting, and in particular to a low-stress rotating pipe, a low-stress rotating fire fighting water crane and an installation method thereof. Background Art

[0002] A fire water crane refers to a pipeline equipment used in firefighting to connect firefighting equipment and instruments and to transport water for firefighting. The fire water crane is directly connected to the fire water source. When in use, fire water can be quickly transmitted from the pipeline through the fire water crane, and the fire water is injected from the top into the fire water tank of the fire truck through a curved pipe. Compared with the traditional method of connecting the fire water tank through a fire hydrant and a fire hose, adding fire water through a fire water crane can reduce the impact of water pressure when the water level in the water tank is high, making the speed of adding fire water faster. At the same time, in order to cope with the harsh environment when a fire occurs, the fire water crane has good pressure resistance, corrosion resistance, and high temperature resistance.

[0003] Although the above-mentioned prior art can solve the corresponding technical problems, it still has certain defects: the existing fire water crane is fixedly locked and connected through multiple split fire pipe fittings, so that its extension angle and transmission angle are fixed. When the fire truck is adding water, it is often necessary to move to a designated position to align the fire water crane with the water filling port of its water tank. When it is necessary to adjust the end alignment position of the fire water crane, it cannot be adjusted directly, and the alignment position needs to be adjusted and changed through a hose or additionally connected split pipe fittings. The adjustment steps are cumbersome and time-consuming, which makes the adaptability of the fire water crane poor. Summary of the invention

[0004] The purpose of the present invention is to provide a low-stress rotating pipe, a low-stress rotating fire-fighting water crane and an installation method thereof, which are simple to adjust, have strong adaptability and are not easy to break at the top, in view of the defects and shortcomings of the prior art.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a low-stress rotating tube, comprising an outlet tube and a rotating tube welded and connected at the bottom end of the outlet tube, the rotating tube comprising a rotating tube and a fixed tube whose inner wall is slidably connected to the outer wall of the bottom of the rotating tube, the outer wall of the rotating tube is integrally formed with a plurality of sealing ring grooves, a sealing ring is sleeved in the sealing ring groove, a first ball rolling groove is provided on the outer wall at the position where the rotating tube and the fixed tube are in contact, a second ball rolling groove is provided at a position of the inner wall of the fixed tube corresponding to the first ball rolling groove, the first ball rolling groove and the second ball rolling groove are provided with an outer wall and the first ball rolling groove and the upper and lower surfaces of the inner wall of the second ball rolling groove The ball is fitted together, and the inner walls of the first ball groove and the second ball groove are filled with grease. The outer wall of the fixed tube is also provided with a ball loading and unloading groove which is connected to the side wall of the second ball groove. The inner wall of the ball loading and unloading groove is detachably engaged with a closing plug whose end extends to the outside of the fixed tube. The closing plug includes a closing plug body and an engaging threaded layer which is turned and formed on the outer wall of the closing plug body and is engaged with the inner wall of the ball loading and unloading groove. The outer wall of the rotating tube is detachably sleeved with a driven gear disc sleeve for connecting the gear disc, and the outer wall of the rotating tube is provided with an internal thread groove. The outer wall of the rotating tube is provided with a plurality of fixing bolts which are engaged with the internal thread groove and penetrate the driven gear disc sleeve.

[0006] A further improvement is that a positioning block is provided at the bottom of the fixed tube.

[0007] A further improvement is that a hexagonal nut with a width greater than the diameter of the closing plug body is also provided on the top of the closing plug body.

[0008] A further improvement is that a raw tape layer is also wound around the outer wall of the meshing thread layer.

[0009] A further improvement is that a hemispherical sealing block made of silicone material is provided at the bottom end of the sealing plug body.

[0010] A further improvement is that a connecting flange is provided at the bottom of the rotating tube.

[0011] To achieve the above-mentioned purpose, the present invention can also adopt the following technical scheme: a low-stress rotating fire-fighting water crane, comprising an above-ground delivery pipe and a water receiving pipe interconnected and fixedly connected to the bottom end of the above-ground delivery pipe, a drain valve is provided in the middle section of the water receiving pipe, and an extension rod extending upward to the surface is provided on the rotating shaft of the drain valve, the above-ground delivery pipe comprises an inlet pipe interconnected and fixedly connected to the end of the water receiving pipe and a water outlet pipe arranged at the end of the inlet pipe, a low-stress rotating pipe is provided between the top end of the outlet pipe and the side end of the inlet pipe, a driven gear is provided on the outer wall of the low-stress rotating pipe, a rotating device is provided on the outer wall of the water inlet pipe, a driving gear meshing with the driven gear is sleeved on the top end of the rotating device, the rotating device is rotated to drive the driving gear to rotate, and the rotational force is output to the low-stress rotating pipe through the driven gear to change the angle of the outlet pipe.

[0012] A further improvement is that a main valve is also provided on the middle section of the water receiving pipeline close to the input end.

[0013] A further improvement is that the outer wall of the extension rod is also sleeved with a protective sleeve.

[0014] A further improvement is that a twist handle is detachably provided on the top end of the extension rod.

[0015] A further improvement is that a connector is also provided in the middle section of the water inlet pipe.

[0016] A further improvement is that the rotating device includes a connecting shell fixedly arranged on the outer wall of the water inlet pipe and a driving shaft movably engaged and penetrating the side wall of the connecting shell, a driven shaft is also penetrated through the connecting shell, a driving gear is sleeved on the top end of the driven shaft, and the driving shaft and the driven shaft are connected by a gear set.

[0017] A further improvement is that the gear set includes a first bevel gear sleeved on the outer wall of the end of the driving shaft and a second bevel gear sleeved on the outer wall of the driven shaft, and the first bevel gear is meshed and connected with the second bevel gear.

[0018] A further improvement is that a second twist handle is also provided at the other end of the driving shaft.

[0019] A further improvement is that the outer wall of the water inlet pipe is also provided with a support frame which is movably engaged with the middle section of the driven shaft.

[0020] To achieve the above object, the present invention can also adopt the following technical solution: a method for installing a low-stress rotating fire-fighting water crane, comprising the following steps: Step 1: Install the middle section of the water pipe into the main valve, and install the drain valve and extension rod behind the main valve. Close the main valve and connect the water pipe to the municipal water pipe. Bury the water pipe in the ground so that the top of the water pipe is level with the ground and the extension rod is higher than the ground surface. Step 2: insert the outer wall of the rotating tube into the driven gear disc sleeve and load the driven gear disc on the outer wall of the driven gear disc sleeve, weld the lead-out tube at the top of the rotating tube, insert the sealing ring into the sealing ring groove of the outer wall of the rotating tube, and then insert the rotating tube into the fixed tube, align the first ball groove with the second ball groove, load the ball from the ball loading and unloading groove, and then fill in grease and close the ball loading and unloading groove through the closing plug to form a low-stress rotating tube; Step 3: Fix the bottom end of the low-stress rotating tube to the top of the water inlet pipe, and make the driven gear plate engage with the driving gear; Step 4: Connect the top of the water receiving pipe to the water inlet pipe, so that the top of the water receiving pipe and the bottom of the water inlet pipe are fixedly connected and connected to each other to complete the installation.

[0021] After adopting the above technical solution, the beneficial effects of the present invention are: When the water outlet angle of the water outlet pipe needs to be changed, the present invention only needs to quickly twist the rotating device to drive the driving gear to rotate through the rotating device, and then the driven gear plate is rotated synchronously through the gear meshing, so that the rotating tube of the rotating tube rotates in the fixed tube, and then the water outlet pipe connected thereto is driven to rotate. At this time, the water outlet pipe can be rotated synchronously with the rotating tube, so as to change the water outlet angle. The adjustment is simple, the water outlet angle is variable, and the adaptability is strong.

[0022] After the water delivery is completed, the present invention can drain the remaining water in the pipeline to the outside through the drain valve, thereby avoiding water accumulation in the pipeline. Furthermore, when used in cold areas, it can effectively prevent the accumulated water from condensing into ice and causing the pipeline to be frozen and cracked, thereby extending the service life and enhancing adaptability.

[0023] The low-stress rotating pipe of the present invention is arranged at the top of the water inlet pipe and is directly connected to the water outlet pipe through the outlet pipe. Compared with the traditional fire water crane in which the connecting pipe is loaded at the bottom of the water inlet pipe, the lateral component of force caused by the gravity of the water outlet pipe is lower. Therefore, under the same load-bearing conditions, the length of the water outlet pipe can be made longer, so that the fire water crane can transport water to farther places, thereby further improving the adaptability of the fire water crane.

[0024] The present invention provides a first ball groove and a second ball groove on the fixed tube and the rotating tube of the low-stress rotating tube, and the two are matched with each other and balls are loaded into the two, so that the friction resistance of the fixed tube and the rotating tube during relative rotation is reduced by the balls, so that the rotation is smoother, and at the same time, the balls are used to clamp the fixed tube and the rotating tube, so that the force required for the fixed tube and the rotating tube to be separated is greatly increased, thereby further improving the anti-separation ability, and the closing plug and the ball loading and unloading groove are used to make the ball disassembly and assembly simpler than the traditional bearing structure. At the same time, compared with the traditional bearing structure, the precision requirement is lower, and it is less likely to be stuck and unable to rotate when subjected to lateral force. It can adapt to longer and heavier water outlet pipes, further improving the applicability of fire water cranes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 2. It is a schematic structural diagram of the low stress rotating tube of the present invention in a front view; Figure 2It is a structural schematic diagram of a front view cross section of a rotating tube of the present invention; Figure 3 It is a schematic diagram of the structure of the top cross section of the rotating tube of the present invention located at the first ball groove and the second ball groove; Figure 4 is a schematic structural diagram of a front cross-section of a sealing plug of the present invention; Figure 5 It is a structural schematic diagram of the front cross section of the fire fighting water crane of the present invention after assembly; Figure 6 It is a structural schematic diagram of the above-ground delivery pipe of the present invention from the front view; Figure 7 It is a structural schematic diagram of a front view cross section of the rotating device of the present invention. DETAILED DESCRIPTION

[0027] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0028] See also Figure 1-7 As shown, the technical solution adopted in this specific embodiment is: a low-stress rotating tube, including an outlet tube 52 and a rotating tube 53 welded and connected to the bottom end of the outlet tube 52, the rotating tube 53 includes a rotating tube 531 and a fixed tube 532 whose inner wall is slidably connected to the outer wall of the bottom of the rotating tube 531, and the outer wall of the rotating tube 531 is integrally formed with a plurality of sealing ring grooves 534, and a sealing ring 533 is sleeved in the sealing ring groove 534; The outer wall of the rotating tube 531 is detachably sleeved with a driven sprocket sleeve for connecting the sprocket, which is conducive to connecting the sprocket to the driven sprocket sleeve, thereby making it easier to disassemble and maintain the connected sprocket; The outer wall of the rotating tube 531 is provided with an internal thread groove 540, and the outer wall of the rotating tube 531 is provided with a plurality of fixing bolts 539 meshing with the internal thread groove 540 and penetrating the driven gear disc sleeve, which is conducive to locking the driven gear disc sleeve more firmly on the rotating tube 531 by screwing in the fixing bolts 539 to prevent relative sliding, so that the rotational force transmitted by the driven gear disc 7 is transmitted more fully; A first ball groove 536 is provided on the outer wall of the rotating tube 531 at the joint position with the fixed tube 532, and a second ball groove 535 is provided on the inner wall of the fixed tube 532 at a position corresponding to the first ball groove 536. The first ball groove 536 and the second ball groove 535 are provided with balls 537 whose outer walls are in contact with the first ball groove 536 and the inner walls of the second ball groove 535 on the upper and lower sides. The first ball groove 536 and the inner walls of the second ball groove 535 are both filled with grease. A ball loading and unloading groove 31 connected to the side wall of the second ball groove 535 is also provided on the outer wall of the fixed tube 532. Before use, the balls 537 can be loaded through the ball loading and unloading groove 31. When the rotating tube 531 rotates, the balls 537 The outer surface of 37 is fitted with the first ball groove 536 and the second ball groove 535, and then during rotation, the friction between the rotating tube 531 and the fixed tube 532 is replaced by the rolling of the ball 537, thereby reducing the friction resistance of the fixed tube 532 and the rotating tube 531 during relative rotation by the ball 537, making the rotation smoother, and at the same time, the ball 537 is inserted between the first ball groove 536 and the second ball groove 535 to clamp the fixed tube 532 and the rotating tube 531, so that the force required for the fixed tube 532 to be separated from the rotating tube 531 is greatly increased, thereby further improving the anti-detachment ability, and thus being able to adapt to a longer and heavier water outlet pipe, further improving the anti-detachment performance and applicability of the rotating tube; A positioning block 538 is provided at the bottom of the fixed tube 532 to prevent the rotating tube 531 from being excessively inserted into the fixed tube 532 and to facilitate alignment with the first ball groove 536 and the second ball groove 535; The inner wall of the ball loading and unloading groove 31 is detachably engaged with a closing plug 32 whose end extends to the outside of the fixing tube 532. The closing plug 32 includes a closing plug body 321 and an engaging thread layer 322 which is formed by turning on the outer wall of the closing plug body 321 and is engaged with the inner wall of the ball loading and unloading groove 31. The closing plug 32 is used to close the ball loading and unloading groove 31 after the ball 537 is loaded, so as to prevent the ball 537 from rolling out during use and affecting the rotation effect. The top of the closing plug body 321 is also provided with a hexagonal nut 325 whose width is greater than the diameter of the closing plug body 321, which is conducive to unscrewing the closing plug body 321 more labor-savingly through a hexagonal wrench or bare hands through the hexagonal nut 325, making disassembly and assembly more convenient.

[0029] The outer wall of the meshing thread layer 322 is also wrapped with a raw tape layer 323, which is beneficial to improving the sealing effect between the meshing thread layer 322 and the ball loading and unloading groove 31 and preventing grease from leaking.

[0030] The bottom end of the closing plug body 321 is provided with a hemispherical closing block 326 made of silicone material, which is beneficial for further improving the sealing effect of the closing plug body 321 on the ball loading and unloading groove 31 through the hemispherical closing block 326 made of silicone material after the closing plug body 321 is installed, and further preventing grease from leaking out and affecting the rotation effect of the ball 537.

[0031] A connecting flange 54 is provided at the bottom of the rotating tube 53 , which is conducive to making the connection between the rotating tube 53 and the water inlet pipe 1 simpler and faster.

[0032] The present invention also provides a low-stress rotating fire-fighting water crane, comprising an above-ground delivery pipe and a water receiving pipe 100 interconnected and fixedly connected to the bottom end of the above-ground delivery pipe, a drain valve 12 is provided in the middle section of the water receiving pipe 100, an extension rod 13 extending upward to the surface of the ground is provided on the rotating shaft of the drain valve 12, the above-ground delivery pipe comprises an inlet pipe 1 interconnected and fixedly connected to the end of the water receiving pipe 100 and an outlet pipe 6 arranged at the end of the inlet pipe 1, a low-stress rotating pipe 5 is provided between the top end of the outlet pipe 6 and the side end of the inlet pipe 1, a driven gear disc 7 is provided on the outer wall of the low-stress rotating pipe 5, the low-stress rotating pipe 5 comprises an outlet pipe 52 welded to the top end and the side end of the outlet pipe 6 and a rotating pipe welded to the bottom end of the outlet pipe 52 53, the bottom end of the rotating tube 53 is fixedly connected to the top of the water outlet pipe 6, the outer wall of the rotating tube 53 is detachably sleeved with a driven gear disc sleeve for fixing the driven gear disc 7, the rotating tube 53 includes a rotating tube 531 and a fixed tube 532 whose inner wall is slidably connected to the outer wall of the bottom of the rotating tube 531, the driven gear disc sleeve is detachably sleeved on the outer wall of the rotating tube 531, the outer wall of the rotating tube 531 is integrally formed with a plurality of sealing ring grooves 534, the sealing ring grooves 534 are sleeved with sealing rings 533, the outer wall of the water inlet pipe 1 is provided with a rotating device 9, the rotating device 9 includes a connecting shell 21 fixedly set on the outer wall of the water inlet pipe 1 and a driving shaft 23 movably engaged and penetrated and set on the side wall of the connecting shell 21, and the connecting shell 21 is also penetrated by a There is a driven shaft 22, the top of the driven shaft 22 is sleeved with a driving gear 8, the driving shaft 23 is connected to the driven shaft 22 through a gear set, the gear set includes a first bevel gear 25 sleeved on the outer wall of the end of the driving shaft 23 and a second bevel gear 24 sleeved on the outer wall of the driven shaft 22, the first bevel gear 25 is meshed with the second bevel gear 24, the top of the rotating device 9 is sleeved with a driving gear 8 meshed with a driven toothed disc 7, the rotating device 9 is rotated to drive the driving gear 8 to rotate, and the rotational force is output to the low-stress rotating pipe 5 through the driven toothed disc 7 to change the angle of the water outlet pipe 6. When in use, the municipal water pipe is connected to the water receiving pipe 100 so that water can be introduced into the water receiving pipe 100. When not in use, the drain valve 12 is used to The water receiving pipe 100 is closed. When it is needed, the drain valve 12 can be rotated on the ground by the extension rod 13 to open it, so that water flows through the drain valve 12 and enters the water inlet pipe 1, so that water enters through the water inlet pipe 1, and passes through the water inlet pipe 1, the low-stress rotating pipe 5, and the water outlet pipe 6 in sequence, and then is discharged from the water outlet pipe 6. After use, the drain valve 12 is closed by rotating the extension rod 13, and the remaining accumulated water in the pipe is discharged outwardly through the drain valve 12. The drain valve 12 is a prior art, thereby avoiding water accumulation in the pipe, and when used in cold areas, it can effectively prevent the accumulated water from condensing into ice and causing the pipe to be frozen and cracked. The service life is longer and the adaptability is stronger. When the water outlet angle of the water outlet pipe 6 needs to be changed,At this time, the driving shaft 23 of the rotating device 9 can be twisted to make it rotate, and the first bevel gear 25 of the gear set can be driven to rotate synchronously. The first bevel gear 25 is meshed and connected with the second bevel gear 24, and then the rotational force is output to the second bevel gear 24 and the rotational force is output to the driven shaft 22 through the second bevel gear 24. A driving gear 8 is provided at the top of the driven shaft 22, so that the driving gear 8 is rotated, and the rotational force is output to the driven gear plate 7 through the meshing of teeth, and then the rotational force is received by the driven gear plate 7 and applied to the driven gear plate sleeve of the low-stress rotating tube 5, and then the driven gear plate sleeve is used to drive the rotating tube 531 to rotate, thereby making the rotating tube 531 rotate in the fixed tube 532, and then the rotating tube 531 drives the outlet pipe 52 and the water outlet pipe 6 to rotate, and at this time, the outlet pipe 52 can be made to rotate. The water pipe 6 rotates synchronously with the rotating pipe 531, thereby changing the water outlet angle, which is simple to adjust, the water outlet angle is variable, and the adaptability is strong. It is fully sealed with a number of sealing rings 533 to prevent water leakage during use. At the same time, the low-stress rotating pipe 5 is arranged at the top of the water inlet pipe 1 and is directly connected to the water outlet pipe 6 through the outlet pipe 52. Compared with the traditional fire water crane connecting pipes loaded at the bottom of the water inlet pipe 1, the lateral force caused by the gravity of the water outlet pipe 6 is lower. Under the same load-bearing conditions, the length of the water outlet pipe 6 can be made longer, so that the fire water crane can deliver water to a farther place, so that the adaptability of the fire water crane is further improved. At the same time, there is no need to set an additional inspection valve in the middle section of the water inlet pipe 1 of the fire water crane, fewer parts, and more cost-saving; A main valve 11 is also provided on the middle section of the water receiving pipe 100 near the input end. In daily use, the main valve 11 is in an open state for a long time, which is conducive to controlling the opening and closing of the water receiving pipe 100 through the main valve 11. When the fire water crane is inspected and maintained, the main valve 11 can be closed, thereby making the inspection safer and preventing water leakage; The outer wall of the extension rod 13 is also covered with a protective sleeve 15, which is beneficial to protect the extension rod 13 and prevent it from being damaged or distorted due to corrosion and impact; The top of the extension rod 13 is detachably provided with a twisting handle 14, which is conducive to making the twisting of the extension rod 13 more labor-saving and convenient; The middle section of the water inlet pipe 1 is also provided with a connector 2, which is conducive to connecting pipes from the position of the connector 2 to obtain more fire-fighting water or fire-fighting agent output ports; The other end of the driving shaft 23 is also provided with a second twisting handle 26, which is conducive to making the twisting of the driving shaft 23 more labor-saving and convenient; The outer wall of the rotating tube 5 is also provided with a support frame 10 that is movably engaged with the middle section of the driven shaft 22, which is beneficial to supporting the driven shaft 22 and preventing it from being displaced or deformed after long-term use to affect the combination effect of the driving gear 8 and the driven gear plate 7.

[0033] The present invention also provides a method for installing a low-stress rotating fire-fighting water crane, comprising the following steps: Step 1: Install the middle section of the water receiving pipe 100 into the main valve 11, and install the drain valve 12 and the extension rod 13 behind the main valve 11, close the main valve 11, connect the water receiving pipe 100 to the municipal water pipe, and bury the water receiving pipe 100 in the ground, so that the top of the water receiving pipe 100 is level with the ground, and the extension rod 13 is higher than the ground surface; Step 2: Insert the outer wall of the rotating tube 531 into the driven gear disc sleeve and load the driven gear disc 7 on the outer wall of the driven gear disc sleeve, weld the outlet tube 52 at the top of the rotating tube 531, and insert the sealing ring 533 into the sealing ring groove 534 on the outer wall of the rotating tube 531, then insert the rotating tube 531 into the fixed tube 532, align the first ball groove 536 with the second ball groove 535, load the ball 537 from the ball loading and unloading groove 31, then fill in grease and close the ball loading and unloading groove 31 through the closing plug 32 to form a low-stress rotating tube 5; Step 3: Fix the bottom end of the low-stress rotating tube 5 to the top end of the water inlet pipe 1, and make the driven gear plate 7 engage with the driving gear 8; Step 4: Connect the top end of the water receiving pipe 100 to the water inlet pipe 1, so that the top end of the water receiving pipe 100 and the bottom end of the water inlet pipe 1 are fixedly connected and connected to each other to complete the installation.

[0034] Working principle of the present invention: When the present invention is used, the municipal water pipe is connected to the water receiving pipe 100 so that water can be introduced into the water receiving pipe 100. When it is not in use, the water receiving pipe 100 is closed by the drain valve 12. When it is needed, the drain valve 12 can be rotated on the ground by the extension rod 13 to open it, so that water flows through the drain valve 12 and enters the water inlet pipe 1, so that water enters through the water inlet pipe 1, and passes through the water inlet pipe 1, the low-stress rotating pipe 5, and the water outlet pipe 6 in sequence, and then is discharged from the water outlet pipe 6. After use, the drain valve 12 is closed by rotating the extension rod 13, and the pipe is The remaining accumulated water is discharged outwardly through the drain valve 12. The drain valve 12 is a prior art, thereby avoiding the accumulation of water in the pipeline, and then when used in cold areas, it can effectively prevent the accumulated water from condensing into ice and causing the pipeline to be frozen and cracked. The service life is longer and the adaptability is stronger. When it is necessary to change the water outlet angle of the water outlet pipe 6, the driving shaft 23 of the rotating device 9 can be twisted to rotate it, and the first bevel gear 25 of the gear set can be driven to rotate synchronously. The first bevel gear 25 is meshed and connected with the second bevel gear 24, and then the rotational force is output to the second bevel gear 24 and the second bevel gear 24 is used to change the water outlet angle of the water outlet pipe 6. The rotational force is output to the driven shaft 22. A driving gear 8 is provided at the top of the driven shaft 22, so that the driving gear 8 rotates, and the rotational force is output to the driven toothed disc 7 through tooth meshing, and then the rotational force is received by the driven toothed disc 7 and applied to the driven toothed disc sleeve of the low-stress rotating tube 5, and then the driven toothed disc sleeve drives the rotating tube 531 to rotate, thereby causing the rotating tube 531 to rotate in the fixed tube 532, and then the rotating tube 531 drives the outlet tube 52 and the water outlet pipe 6 to rotate, and at this time, the water outlet pipe 6 can be made to rotate synchronously with the rotating tube 531, thereby changing the water outlet angle and adjusting It is simple, has a variable water outlet angle, and is highly adaptable. At the same time, the low-stress rotating tube 5 is arranged at the top of the water inlet pipe 1, and is directly connected to the water outlet pipe 6 through the outlet pipe 52. Compared with the traditional fire water crane in which the connecting pipe is loaded at the bottom of the water inlet pipe 1, the lateral force caused by the gravity of the water outlet pipe 6 is lower, and thus under the same load-bearing conditions, the length of the water outlet pipe 6 can be made longer, so that the fire water crane can transport water to farther places, and the adaptability of the fire water crane is further improved. At the same time, there is no need to additionally set an inspection valve in the middle section of the water inlet pipe 1 of the fire water crane, fewer components, and more cost-saving.

[0035] The invention is intended to protect the structure of the product. The model of each component is not the content of the invention, and it is also a known technology. Any component on the market that can achieve the above functions of the invention can be used as a choice. Therefore, the model and other parameters of the component are not described in detail in the invention. The contribution of the invention lies in the scientific combination of the components.

[0036] The above shows and describes the basic principles and main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents. Anything not described in detail in the present invention is a well-known technology of those skilled in the art.

Claims

1. A low stress rotating tube, characterized in that: The invention comprises an outlet tube (52) and a rotating tube (53) which is welded to the bottom end of the outlet tube (52), the rotating tube (53) comprising a rotating tube (531) and a fixed tube (532) whose inner wall is slidably connected to the outer wall at the bottom of the rotating tube (531), the outer wall of the rotating tube (531) being integrally formed with a plurality of sealing ring grooves (534), the sealing ring grooves (534) being sleeved with sealing rings (533), a first ball rolling groove (536) being provided on the outer wall at a position where the rotating tube (531) and the fixed tube (532) are in contact with each other, a second ball rolling groove (535) being provided at a position of the inner wall of the fixed tube (532) corresponding to the first ball rolling groove (536), balls (537) being provided in the first ball rolling groove (536) and the second ball rolling groove (535), the outer walls of which are in contact with the upper and lower surfaces of the inner walls of the first ball rolling groove (536) and the second ball rolling groove (535), The inner walls of the first ball groove (536) and the second ball groove (535) are filled with grease. The outer wall of the fixed tube (532) is also provided with a ball loading and unloading groove (31) which is connected to the side wall of the second ball groove (535). The inner wall of the ball loading and unloading groove (31) is detachably engaged with a closing bolt (32) whose end extends outside the fixed tube (532). The closing bolt (32) comprises a closing bolt body (321) and a meshing thread layer (322) which is machined and formed on the outer wall of the closing bolt body (321) and meshed with the inner wall of the ball loading and unloading groove (31). The outer wall of the rotating tube (531) is detachably sleeved with a driven toothed disc sleeve for connecting the toothed disc. The outer wall of the rotating tube (531) is provided with an internal thread groove (540). The outer wall of the rotating tube (531) is provided with a plurality of fixing bolts (539) which mesh with the internal thread groove (540) and penetrate the driven toothed disc sleeve.

2. A low stress rotating tube according to claim 1, characterized in that: A positioning block (538) is provided at the bottom of the fixing tube (532).

3. The low stress rotating tube according to claim 1, characterized in that: The top of the closing plug body (321) is also provided with a hexagonal nut (325) having a width greater than the diameter of the closing plug body (321).

4. The low stress rotating tube according to claim 1, characterized in that: The outer wall of the meshing thread layer (322) is also wound with a raw tape layer (323).

5. The low stress rotating tube according to claim 1, characterized in that: A hemispherical sealing block (326) made of silicone material is provided at the bottom end of the sealing plug body (321).

6. The low stress rotating tube according to claim 1, characterized in that: A connecting flange (54) is provided at the bottom of the rotating tube (53).

7. A low-stress rotating fire-fighting water crane, comprising an above-ground delivery pipe and a water receiving pipe (100) interconnected and fixedly connected to the bottom end of the above-ground delivery pipe, characterized in that: A drain valve (12) is provided in the middle section of the water receiving pipe (100), and an extension rod (13) extending upward to the ground surface is provided on the rotating shaft of the drain valve (12). The above-ground delivery pipe comprises an inlet pipe (1) which is interconnected and fixedly connected to the end of the water receiving pipe (100), and an outlet pipe (6) arranged at the end of the inlet pipe (1). A low-stress rotating pipe (5) as claimed in any one of claims 1 to 6 is provided between the top end of the outlet pipe (6) and the side end of the inlet pipe (1). A driven gear disc (7) is provided on the outer wall of the low-stress rotating pipe (5). A rotating device (9) is provided on the outer wall of the water inlet pipe (1). A driving gear (8) meshingly connected to the driven gear disc (7) is sleeved on the top end of the rotating device (9). The rotating device (9) is rotated to drive the driving gear (8) to rotate, and the rotational force is output to the low-stress rotating pipe (5) through the driven gear disc (7) to change the angle of the outlet pipe (6).

8. A low stress rotating fire fighting water crane according to claim 7, characterized in that: A main valve (11) is also provided on the middle section of the water receiving pipe (100) close to the input end.

9. A low stress rotating fire fighting water crane according to claim 7, characterized in that: The outer wall of the extension rod (13) is also sleeved with a protective sleeve (15).

10. A low stress rotating fire fighting water crane according to claim 7, characterized in that: The top end of the extension rod (13) is detachably provided with a twist handle (14).

11. A low stress rotating fire fighting water crane according to claim 7, characterized in that: The middle section of the water inlet pipe (1) is also provided with a connector (2).

12. A low stress rotating fire fighting water crane according to claim 7, characterized in that: The rotating device (9) comprises a connecting shell (21) fixedly arranged on the outer wall of the water inlet pipe (1) and a driving shaft (23) movably engaged and penetrating the side wall of the connecting shell (21); a driven shaft (22) is also penetrated through the connecting shell (21); a driving gear (8) is sleeved on the top end of the driven shaft (22); and the driving shaft (23) and the driven shaft (22) are connected via a gear set.

13. A low stress rotating fire fighting water crane according to claim 12, characterized in that: The gear set comprises a first bevel gear (25) sleeved on the outer wall of the end of the driving shaft (23) and a second bevel gear (24) sleeved on the outer wall of the driven shaft (22), and the first bevel gear (25) is meshingly connected with the second bevel gear (24).

14. A low stress rotating fire fighting water crane according to claim 13, characterized in that: A second twist handle (26) is also provided at the other end of the driving shaft (23).

15. A low stress rotating fire fighting water crane according to claim 12, characterized in that: The outer wall of the water inlet pipe (1) is also provided with a support frame (10) that is movably engaged with the middle section of the driven shaft (22).

16. A method for installing a low-stress rotating fire-fighting water crane, characterized in that: The steps include: Step 1: Install the middle section of the water receiving pipe (100) into the main valve (11), and install the drain valve (12) and the extension rod (13) behind the main valve (11), close the main valve (11), connect the water receiving pipe (100) to the municipal water pipe, and bury the water receiving pipe (100) in the ground so that the top of the water receiving pipe (100) is level with the ground and the extension rod (13) is higher than the ground surface; Step 2: insert the outer wall of the rotating tube (531) into the driven gear disc sleeve and load the driven gear disc (7) on the outer wall of the driven gear disc sleeve, weld the outlet tube (52) to the top of the rotating tube (531), and insert the sealing ring (533) into the sealing ring groove (534) on the outer wall of the rotating tube (531), then insert the rotating tube (531) into the fixed tube (532), align the first ball groove (536) with the second ball groove (535), load the ball (537) from the ball loading and unloading groove (31), then fill in grease and close the ball loading and unloading groove (31) through the closing plug (32), so as to form a low-stress rotating tube (5); Step 3: Fix the bottom end of the low-stress rotating tube (5) to the top end of the water inlet pipe (1), and make the driven gear plate (7) engage with the driving gear (8); Step 4: Connect the top end of the water receiving pipe (100) to the water inlet pipe (1), so that the top end of the water receiving pipe (100) and the bottom end of the water inlet pipe (1) are fixedly connected and connected to each other, and the installation is completed.

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