A device and method for preparing rubber linings for pipes

Abstract

This invention discloses a device for preparing rubber linings for pipes, comprising a base plate, a placement frame fixedly connected to the front of the base plate, and a pipe movably sleeved on the top of the placement frame. The invention utilizes an inner annular groove and a flow channel within a support plate, along with a mounting ring fixedly fitted to the outer surface of a spraying rod and a hole on the mounting ring. Hot-melt rubber is introduced into the internal channel of the spraying rod, and with the aid of annularly distributed outlet pipes, the hot-melt rubber is sprayed into the space between the pipe and the spraying rod, forming a lining layer. During the gradual cooling and curing process, a motor continuously rotates the spraying rod to prevent the cured lining from adhering to it, ensuring easy removal of the spraying rod after curing. This maintains the stability of the rubber lining and prevents tearing during separation if the lining is adhered, ensuring stable molding and good performance of the rubber lining.

Description

Technical Field

[0001] This invention relates to a device and method for preparing rubber linings for pipelines, belonging to the field of rubber lining product manufacturing technology. Background Technology

[0002] In industrial production, pipe linings are required to accommodate different media. Currently, the main pipe lining processes include the interlocking lining method, the spiral winding method, and the hot-melt roller coating method. These processes differ significantly in their manufacturing methods, raw materials, and technical characteristics.

[0003] In existing rubber liner preparation equipment, a spraying rod is typically inserted into the pipe to spray hot-melt rubber liquid onto the inside of the pipe. The cooled hot-melt rubber liquid then solidifies to form the pipe liner. However, after spraying, the solidified rubber liner adheres to the spraying pipe, making separation difficult. Forcible separation can easily cause the solidified rubber liner to tear, resulting in poor actual rubber liner preparation.

[0004] Furthermore, in existing rubber liner preparation equipment, after spraying through the internal channels of the spraying rod, the rubber concentrate in the channels cools and solidifies as the temperature decreases, causing channel blockage. In practice, the spraying rod needs to be internally treated before use. Moreover, during long-distance transportation, the hot melt rubber concentrate in the channels of the spraying rod cools down significantly, its fluidity is significantly reduced, greatly reducing the molding efficiency of the rubber liner and resulting in poor actual performance. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for preparing rubber linings for pipes, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A device and method for preparing rubber linings for pipes are disclosed, comprising a base plate, a placement frame fixedly connected to the front of the base plate, a pipe movably sleeved on the top of the placement frame, a mounting plate fixedly connected to the top surface of the base plate, telescopic rods fixedly mounted on both the left and right sides of the mounting plate, a support plate fixedly mounted on the end face of the telescopic rods, a sleeve hole formed on the side of the support plate, a spraying rod movably sleeved on the inner surface of the sleeve hole, a motor provided on the side of the support plate, the output shaft of the motor fixedly connected to the spraying rod, an inner annular groove formed inside the support plate, and a mounting ring fixedly sleeved on the outer surface of the spraying rod. The outer surface of the mounting ring has a first annular groove, and the interior of the mounting ring has a first hole. The mounting ring is movably fitted into the first inner annular groove. The interior and side of the spraying rod have a channel hole and a second hole, respectively. The two ends of the second hole are connected to the channel hole and the first hole, respectively. An outlet tube is fixedly fitted inside the spraying rod, and the inner end of the outlet tube is connected to the channel hole. The interior of the support plate has a first flow channel, which is connected to the first inner annular groove. The outer surface of the spraying rod is movably fitted into the pipe. A stepped cover is fixedly fitted onto the outer surface of the spraying rod, and the stepped cover is movably fitted into the pipe.

[0008] First embodiment: as follows Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the pipe is placed in the top inner groove of the placement frame, and the mounting bolts are tightened to clamp and fix the pipe. The telescopic rod is activated, causing the support plate to move laterally, so that the spraying rods on both sides are inserted into the inside of the pipe, and the stepped caps on the outer surface of the spraying rods are inserted into the pipe and cover it. Hot-melt rubber raw material is injected into the feed box and passed through the feed hole into the first flow channel, and then enters the first inner ring groove through the first flow channel. It enters the channel hole through the second hole on the outer surface of the spraying rod and the first hole on the mounting ring. The hot-melt rubber entering the channel hole is continuously injected and sprayed onto the inner wall of the pipe through the outlet pipe connected to the channel hole. At the same time, the motor is started, so that the motor drives the spraying rod to keep rotating and continue spraying during the rotation. After the spraying is completed, the rotation is maintained and the inner lining is cured and formed. After curing, the telescopic rod is activated, so that the spraying rods on both sides are removed from the pipe, completing the inner lining preparation.

[0009] First, by creating an inner annular groove and a flow channel inside the support plate, and using a mounting ring fixedly fitted to the outer surface of the spraying rod, along with a hole on the mounting ring, hot melt rubber is introduced into the internal channel hole of the spraying rod. Combined with annularly distributed outlet pipes, the hot melt rubber is sprayed into the space between the pipes and the spraying rod, forming an inner lining. During the gradual cooling and curing process, a motor continuously drives the spraying rod to rotate, preventing the cured lining from adhering to the spraying rod. This ensures that the spraying rod can be easily removed after curing, maintaining the stability of the rubber lining and preventing tearing during separation if the rubber lining is adhered. This ensures stable molding of the rubber lining and good performance.

[0010] Preferably, a feeding box is fixedly installed on the top surface of the support plate, and a feeding hole is opened on the top surface of the support plate. The upper and lower ends of the feeding hole are respectively connected to the feeding box and the first flow channel. A motor frame is fixedly installed on the side of the support plate, and the inner surface of the motor frame is fixedly installed with the motor. Hot melt rubber is injected by using the feeding box in conjunction with an external feeding device.

[0011] Preferably, the spraying rod has mounting holes inside, which are distributed in a ring inside the spraying rod. The inner surface of the mounting holes is fixedly sleeved with the outlet tube. By using the mounting ring to movably sleeve with the first inner ring groove, it is ensured that the motor can drive the spraying rod to rotate stably. In conjunction with the first ring groove and the first hole, hot melt rubber is introduced into the interior of the spraying rod, ensuring that spraying can still be achieved during the rotation of the spraying rod.

[0012] Preferably, a control box is fixedly installed on the top surface of the base plate, and mounting bolts are threaded onto the front of the placement rack. The control box is used to start and stop the control device, and the mounting bolts are used to fix the pipe in place.

[0013] Preferably, the spraying rod has an annular cavity inside, a heating tube is fixedly installed inside the annular cavity, a partition is fixedly connected to the inner surface of the annular cavity, and a side opening is opened on the front of the partition. By using the partitions distributed vertically in the annular cavity, the annular cavity is divided into two spaces, front and rear, to ensure that the supplied air can enter and exit from the same end, adapting to the arrangement of the air inlet and outlet, and forming a stable air passage path.

[0014] Preferably, the support plate has a second inner annular groove inside, and the outer surface of the spraying rod has a second annular groove. An air inlet and an air outlet are respectively provided on both sides of the outer surface of the spraying rod. Both the air inlet and outlet are connected to the second annular groove. The second inner annular groove is located outside the second annular groove. By utilizing the second inner annular groove and the second annular groove, along with the left and right distributed air inlets and outlets, an air passage is formed. This ensures that the supplied air heats the hot-melt rubber along the path after absorbing heat, and also allows the supplied air to be discharged. Crucially, this ensures that the air passage remains operational during the rotation of the spraying rod.

[0015] Preferably, the support plate has a connecting hole and a heat insulation cavity inside. The heat insulation cavity is located outside the first flow channel. The two ends of the connecting hole are connected to the heat insulation cavity and the second inner annular groove, respectively. The inner side of the support plate has an air vent, which is connected to the heat insulation cavity. By using the heat insulation cavity to insulate the inside of the support plate, the hot melt rubber flow path has a good heat insulation effect, and the air vent is used to discharge air.

[0016] Preferably, a mounting frame is fixedly connected to the front of the support plate, and a fan is provided inside the mounting frame. The mounting frame is connected to the air inlet. By using the fan in the mounting frame to introduce ambient air, on the one hand, the air is guided to absorb heat and become hot air, which gradually keeps the flow path of the hot melt rubber warm and reduces the cooling rate of the hot melt rubber. On the other hand, when the heating tube is turned off, the ambient air is introduced to achieve rapid cooling and improve the preparation efficiency of the rubber lining cooling and curing.

[0017] Second embodiment: as follows Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, when hot melt rubber raw material is introduced, the heating pipe is activated to raise the temperature in the annular cavity, stabilizing the temperature of the hot melt rubber in the channel hole. Simultaneously, the fan is activated to introduce air into the annular cavity through the air inlet. The air entering the annular cavity moves along the upper and lower partitions and flows to the side opening on the other side of the partition. From there, it flows into the annular cavity on the other side of the partition and then back to the air outlet. The air then flows through the air outlet and the second inner annular groove into the connecting hole. The hot air entering the connecting hole enters the insulation cavity, stabilizing the temperature of the hot melt rubber in the first flow channel. After spraying is completed, the spraying rod is kept rotating, the heating pipe is turned off, and the fan continues to be activated, allowing ambient air to be blown into the spraying rod. This rapidly lowers the internal temperature of the spraying rod, causing the injected hot melt rubber to cool and solidify quickly. When injecting into subsequent channels, the heating pipe and fan are activated in advance during the injection of hot melt rubber, allowing the rubber solidified in the channel hole and the first flow channel to quickly become a hot melt transition state.

[0018] First, by utilizing the annular cavity in the spraying rod and adding a heating tube within it, the temperature inside the spraying rod is increased during lining preparation in conjunction with a fan. This stabilizes the temperature of the hot-melt rubber in the channel holes, preventing a decrease in flow rate due to temperature drop. The fan also facilitates hot air transfer, directing hot air to one side of the first flow channel, thus maintaining the temperature along the hot-melt rubber's flow path and preventing cooling during flow, significantly improving spraying efficiency. During the second spraying preparation, the heating tube further heats and solidifies the rubber in the spraying rod, causing it to remelt, preventing blockages and improving unblocking efficiency.

[0019] Furthermore, by utilizing a fan and annular cavity, after the hot melt rubber injection and spraying are completed, ambient cold air is introduced into the spraying rod while the heating pipe is closed, thereby increasing the cooling rate inside the spraying rod and enabling the hot melt rubber to quickly exchange heat and cool down. This greatly improves the cooling and curing speed of the hot melt rubber after spraying, increases the actual rubber lining preparation efficiency, and results in good performance.

[0020] A method for preparing a rubber liner for pipes includes the following preparation steps:

[0021] Step 1: Place the pipe in the top inner groove of the placement rack and tighten the mounting bolts. Activate the telescopic rod to move the support plate laterally, so that the spraying rods on both sides can fit into the inside of the pipe and the stepped caps on the outer surface of the spraying rods can cover the pipe.

[0022] Step 2: Inject the hot-melt rubber raw material into the feed box, and enter the inner ring groove through the first flow channel. It also enters the channel hole through the second hole on the outer surface of the spray rod and the first hole on the mounting ring. It is sprayed onto the inner wall of the pipe through the outlet pipe connected to the channel hole. At the same time, the motor is started to keep the spray rod rotating and continue spraying during the rotation. After the spraying is completed, the rotation is maintained and the inner lining is cured and formed.

[0023] Step 3: When hot melt rubber raw material is introduced, start the heating tube to raise the temperature in the annular cavity and stabilize the temperature of the hot melt rubber in the channel hole. Start the fan to introduce air into the annular cavity. The air entering the annular cavity moves along the upper and lower partitions and enters the annular cavity on the other side of the partition through the side openings on the partitions. It then flows in reverse to the air outlet and enters the insulation cavity through the connecting hole, stabilizing the temperature of the hot melt rubber in the first flow channel. After the spraying is completed, keep the spraying rod rotating, turn off the heating tube, and continue to start the fan to blow ambient air into the spraying rod, allowing the sprayed hot melt rubber to cool and solidify quickly.

[0024] The beneficial effects of this invention are as follows:

[0025] This invention utilizes an inner annular groove and a flow channel within a support plate, along with a mounting ring fixedly fitted to the outer surface of a spraying rod and a hole on the mounting ring. Hot-melt rubber is introduced into the internal channel of the spraying rod, and with the aid of annularly distributed outlet pipes, the hot-melt rubber is sprayed into the space between the pipes and the spraying rod, forming an inner lining. During the gradual cooling and curing process, a motor continuously rotates the spraying rod to prevent the cured lining from adhering to it, ensuring easy removal of the spraying rod after curing. This maintains the stability of the rubber lining and prevents tearing during separation if the lining is adhered, ensuring stable molding of the rubber lining and excellent performance.

[0026] Meanwhile, by utilizing the annular cavity in the spraying rod and adding a heating tube within it, the temperature inside the spraying rod is increased during lining preparation in conjunction with a fan. This stabilizes the temperature of the hot-melt rubber in the channel holes, preventing a decrease in flow rate due to temperature drop. The fan also facilitates hot air transfer, directing hot air to one side of the first flow channel to maintain the temperature along the hot-melt rubber's flow path, preventing temperature drop during flow and significantly improving spraying efficiency. Furthermore, during the secondary spraying preparation, the heating tube heats and solidifies the rubber in the spraying rod, causing it to remelt, preventing blockage and improving unblocking efficiency.

[0027] In addition, by utilizing a fan and annular cavity, after the hot melt rubber injection and spraying is completed, ambient cold air is introduced into the spraying rod while the heating tube is closed, thereby increasing the internal cooling rate of the spraying rod and enabling the hot melt rubber to quickly exchange heat and cool down. This greatly improves the cooling and curing speed of the hot melt rubber after spraying, increases the actual rubber lining preparation efficiency, and has good performance. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a cross-sectional schematic diagram of the support plate and spraying rod of the present invention;

[0030] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0031] Figure 4 This is a schematic diagram of the support plate of the present invention;

[0032] Figure 5 This is an exploded view of the area between the spraying rod and the mounting ring of the present invention;

[0033] Figure 6 This is a cross-sectional view of the spraying rod of the present invention;

[0034] Figure 7 This is a cross-sectional view of the spraying rod of the present invention;

[0035] Figure 8 This is a cross-sectional schematic diagram of the support plate of the present invention;

[0036] Figure 9 This is a schematic diagram of the partition of the present invention.

[0037] In the diagram: 1. Base plate; 2. Control box; 3. Placement rack; 4. Pipe; 5. Mounting plate; 6. Telescopic rod; 7. Support plate; 8. Socket hole; 9. No. 1 inner ring groove; 10. Spraying rod; 11. Mounting ring; 12. No. 1 ring groove; 13. No. 1 hole; 14. Channel hole; 15. Outlet pipe; 16. Motor frame; 17. Motor; 18. No. 1 flow channel; 19. Feed hole; 20. Feed box; 21. Stepped cover; 22. No. 2 hole; 23. Mounting bolt; 24. Ring cavity; 25. Heating tube; 26. Mounting hole; 27. Air inlet; 28. Air outlet; 29. ​​No. 2 ring groove; 30. Partition plate; 31. No. 2 inner ring groove; 32. Connecting hole; 33. Insulation cavity; 34. Air outlet; 35. Mounting frame; 36. Fan; 37. Side opening. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] like Figures 1 to 9As shown, this embodiment of the invention provides a device and method for preparing rubber linings for pipes, including a base plate 1. A placement frame 3 is fixedly connected to the front of the base plate 1, and a pipe 4 is movably sleeved on the top of the placement frame 3. A mounting plate 5 is fixedly connected to the top surface of the base plate 1. Telescopic rods 6 are fixedly installed on both the left and right sides of the mounting plate 5. A support plate 7 is fixedly installed on the end face of the telescopic rods 6. A sleeve hole 8 is opened on the side of the support plate 7, and a spraying rod 10 is movably sleeved on the inner surface of the sleeve hole 8. A motor 17 is provided on the side of the support plate 7, and the output shaft of the motor 17 is fixedly connected to the spraying rod 10. An inner annular groove 9 is opened inside the support plate 7, and an installation ring 11 is fixedly sleeved on the outer surface of the spraying rod 10. A first annular groove 12 is formed on the outer surface of the ring 11, and a first hole 13 is formed inside the mounting ring 11. The mounting ring 11 is movably fitted into the first inner annular groove 9. The spraying rod 10 has a channel hole 14 and a second hole 22 formed on its interior and side, respectively. The two ends of the second hole 22 are connected to the channel hole 14 and the first hole 13, respectively. An outlet tube 15 is fixedly fitted inside the spraying rod 10. The inner end of the outlet tube 15 is connected to the channel hole 14. A first flow channel 18 is formed inside the support plate 7. The first flow channel 18 is connected to the first inner annular groove 9. The outer surface of the spraying rod 10 is movably fitted into the pipe 4. A stepped cover 21 is fixedly fitted onto the outer surface of the spraying rod 10. The stepped cover 21 is movably fitted into the pipe 4.

[0040] First embodiment: as follows Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, pipe 4 is placed in the top inner groove of the placement frame 3, and the mounting bolts 23 are tightened to clamp and fix pipe 4. The telescopic rod 6 is activated, causing the support plate 7 to move laterally, so that the spraying rods 10 on both sides are inserted into the inside of pipe 4, and the stepped cover 21 on the outer surface of the spraying rod 10 is inserted into pipe 4 and covers pipe 4. Hot melt rubber raw material is injected into the feed box 20 and introduced into the first flow channel 18 through the feed hole 19, and enters the first inner ring groove 9 through the first flow channel 18, and is then introduced into the first inner ring groove 9 through the spraying rod 10. The second hole 22 on the surface and the first hole 13 on the mounting ring 11 enter the channel hole 14. The hot melt rubber entering the channel hole 14 is continuously injected and sprayed onto the inner wall of the pipe 4 through the outlet pipe 15 connected to the channel hole 14. At the same time, the motor 17 is started, so that the motor 17 drives the spraying rod 10 to keep rotating and continue spraying during the rotation. After the spraying is completed, the rotation is maintained and the inner lining is cured and formed. After curing and forming, the telescopic rod 6 is started, so that the spraying rods 10 on both sides are removed from the pipe 4, completing the preparation of the inner lining.

[0041] First, by opening an inner annular groove 9 and a flow channel 18 inside the support plate 7, and using a mounting ring 11 fixedly fitted to the outer surface of the spraying rod 10, and a hole 13 on the mounting ring 11, hot melt rubber is introduced into the internal channel hole 14 of the spraying rod 10. With the help of the annularly distributed outlet pipe 15, the hot melt rubber is sprayed into the space between the pipe 4 and the spraying rod 10 to form an inner lining layer. During the gradual cooling and curing process, the motor 17 continuously drives the spraying rod 10 to rotate, preventing the cured inner lining from adhering to the spraying rod 10. This ensures that the spraying rod 10 can be easily removed after curing, maintaining the stability of the rubber inner lining and preventing tearing during separation if the rubber inner lining is adhered. This ensures the stable molding of the rubber inner lining and good performance.

[0042] The top surface of the support plate 7 is fixedly equipped with a feeding box 20, and the top surface of the support plate 7 is provided with a feeding hole 19. The upper and lower ends of the feeding hole 19 are respectively connected to the feeding box 20 and the first flow channel 18. The side of the support plate 7 is fixedly equipped with a motor frame 16, and the inner surface of the motor frame 16 is fixedly installed with a motor 17. The motor 17 provides rotational power, and the hot melt rubber is injected by using the feeding box 20 in conjunction with the external feeding equipment.

[0043] The spraying rod 10 has mounting holes 26 inside, which are distributed in a ring inside the spraying rod 10. The inner surface of the mounting holes 26 is fixedly sleeved with the outlet tube 15. By using the mounting ring 11 to movably sleeve with the first inner ring groove 9, the motor 17 can drive the spraying rod 10 to rotate stably. In conjunction with the first ring groove 12 and the first hole 13, hot melt rubber is introduced into the interior of the spraying rod 10, ensuring that spraying can still be achieved during the rotation of the spraying rod 10.

[0044] The control box 2 is fixedly installed on the top surface of the base plate 1, and the mounting bolt 23 is threaded on the front of the placement frame 3. The control box 2 is used to start and stop the control device, and the mounting bolt 23 is used to fix the pipe 4.

[0045] The spray bar 10 has an annular cavity 24 inside, and a heating tube 25 is fixedly installed inside the annular cavity 24. A partition 30 is fixedly connected to the inner surface of the annular cavity 24. A side opening 37 is opened on the front of the partition 30. By using the partition 30 distributed vertically in the annular cavity 24, the annular cavity 24 is divided into two spaces, front and rear, to ensure that the supplied air can enter and exit from the same end, adapting to the arrangement of the air inlet 27 and the air outlet 28, forming a stable air passage path.

[0046] The support plate 7 has a second inner annular groove 31 inside, and the outer surface of the spray rod 10 has a second annular groove 29. The two sides of the outer surface of the spray rod 10 have air inlets 27 and air outlets 28 respectively. Both air inlets 27 and air outlets 28 are connected to the second annular groove 29. The second inner annular groove 31 is located outside the second annular groove 29. By utilizing the second inner annular groove 31 and the second annular groove 29, and in conjunction with the left and right distributed air inlets 27 and air outlets 28, an air passage is formed to ensure that the supplied air heats the hot melt rubber on the path after absorbing heat, and to realize the discharge of the supplied air. The key point is to ensure that the air passage is still used during the rotation of the spray rod 10.

[0047] The support plate 7 has a connecting hole 32 and a heat insulation cavity 33 inside. The heat insulation cavity 33 is located outside the first flow channel 18. The two ends of the connecting hole 32 are connected to the heat insulation cavity 33 and the second inner ring groove 31, respectively. The inner side of the support plate 7 has an air outlet 34, which is connected to the heat insulation cavity 33. By using the heat insulation cavity 33 to insulate the inside of the support plate 7, the hot melt rubber flow path has a good heat insulation effect, and the air outlet 34 is used to discharge air.

[0048] The support plate 7 is fixedly connected to the front of the mounting frame 35. The mounting frame 35 is equipped with a fan 36. The mounting frame 35 is connected to the air inlet 27. By using the fan 36 in the mounting frame 35 to introduce ambient air, on the one hand, the air is guided to absorb heat and become hot air, which gradually keeps the flow path of the hot melt rubber warm and reduces the cooling rate of the hot melt rubber. On the other hand, when the heating tube 25 is closed, the ambient air is introduced to achieve rapid cooling and improve the preparation efficiency of the rubber lining cooling and curing.

[0049] Second embodiment: as follows Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9As shown, when hot melt rubber raw material is introduced, the heating tube 25 is activated, causing the temperature in the annular cavity 24 to rise, thus stabilizing the temperature of the hot melt rubber in the channel hole 14. The fan 36 is also activated, drawing air into the annular cavity 24 through the air inlet 27. The air entering the annular cavity 24 moves along the upper and lower partitions 30 and flows to the side opening 37 on the other side of the partition 30. Through the side opening 37, it enters the annular cavity 24 on the other side of the partition 30 and flows in the reverse direction to the air outlet 28. It then flows through the air outlet 28 and the second inner annular groove 31 into the connecting hole 32, entering the... Hot air from the connecting hole 32 enters the insulation cavity 33, stabilizing the temperature of the hot melt rubber in the first flow channel 18. After spraying, the spraying rod 10 is kept rotating, the heating tube 25 is turned off, and the fan 36 is started again, so that ambient air is blown into the spraying rod 10, causing the internal temperature of the spraying rod 10 to drop rapidly, and the sprayed hot melt rubber to cool and solidify quickly. When injecting into the subsequent pipe 4, the heating tube 25 and the fan 36 are started in advance when injecting the hot melt rubber, so that the rubber solidified in the channel hole 14 and the first flow channel 18 quickly becomes a hot melt transition state.

[0050] First, by utilizing the annular cavity 24 in the spraying rod 10 and adding a heating tube 25 to the annular cavity 24, the internal temperature of the spraying rod 10 is increased during the preparation of the liner, in conjunction with the fan 36. This increases the temperature of the hot melt rubber in the channel hole 14, stabilizing the temperature and preventing a decrease in flow rate due to temperature drop. The fan also facilitates hot air transfer, allowing hot air to enter one side of the first flow channel 18, thus maintaining the temperature along the flow path of the hot melt rubber and preventing temperature drop during flow, greatly improving spraying efficiency. During the second spraying preparation, the heating tube 25 is used to heat and solidify the rubber in the spraying rod 10, making it melt again, preventing blockage and improving unblocking efficiency.

[0051] Furthermore, by utilizing the fan 36 and the annular cavity 24, after the hot melt rubber injection and spraying are completed, and with the heating pipe 25 closed, ambient cold air is introduced into the spraying rod 10, thereby increasing the internal cooling rate of the spraying rod 10, enabling the hot melt rubber to quickly exchange heat and cool down, thus greatly improving the cooling and curing speed of the hot melt rubber after spraying, improving the actual rubber lining preparation efficiency, and achieving good results.

[0052] A method for preparing a rubber liner for pipes includes the following preparation steps:

[0053] Step 1: Place the pipe 4 in the top inner groove of the placement rack 3 and tighten the mounting bolts 23. Activate the telescopic rod 6 to move the support plate 7 laterally, so that the spraying rods 10 on both sides can be inserted into the inside of the pipe 4 and the stepped cover 21 on the outer surface of the spraying rod 10 can cover the pipe 4.

[0054] Step 2: The hot-melted rubber raw material is injected into the feed box 20 and enters the inner ring groove 9 through the first flow channel 18. It enters the channel hole 14 through the second hole 22 on the outer surface of the spray rod 10 and the first hole 13 on the mounting ring 11. It is sprayed onto the inner wall of the pipe 4 through the outlet pipe 15 connected to the channel hole 14. At the same time, the motor 17 is started so that the spray rod 10 keeps rotating and continues to spray during the rotation. After the spraying is completed, it continues to rotate and the inner lining is cured and formed.

[0055] Step 3: When hot melt rubber raw material is introduced, the heating tube 25 is activated to raise the temperature in the annular cavity 24, thereby stabilizing the temperature of the hot melt rubber in the channel hole 14. The fan 36 is activated to introduce air into the interior of the annular cavity 24. The air entering the annular cavity 24 moves along the upper and lower partitions 30 and enters the annular cavity 24 on the other side of the partition 30 through the side opening 37 on the partition 30. It then flows in reverse to the air outlet 28 and enters the heat preservation cavity 33 through the connecting hole 32, thereby stabilizing the temperature of the hot melt rubber in the first flow channel 18. After the spraying is completed, the spraying rod 10 is kept rotating, the heating tube 25 is turned off, and the fan 36 is activated again to blow ambient air into the spraying rod 10, thereby rapidly cooling and curing the sprayed hot melt rubber.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A device for preparing a rubber inner lining for a pipe, comprising a base plate (1), characterised in that: A placement rack (3) is fixedly connected to the front of the base plate (1). A pipe (4) is movably sleeved on the top of the placement rack (3). An mounting plate (5) is fixedly connected to the top surface of the base plate (1). Telescopic rods (6) are fixedly installed on both the left and right sides of the mounting plate (5). A support plate (7) is fixedly installed on the end face of the telescopic rod (6). A sleeve hole (8) is opened on the side of the support plate (7). A spraying rod (10) is movably sleeved on the inner surface of the sleeve hole (8). A motor (17) is provided on the side of the support plate (7). The output shaft of the motor (17) is fixedly connected to the spraying rod (10). An inner annular groove (9) is opened inside the support plate (7). An installation ring (11) is fixedly sleeved on the outer surface of the spraying rod (10). An annular groove (12) is opened on the outer surface of the installation ring (11). The mounting ring (11) has a first hole (13) inside, and the mounting ring (11) is movably fitted in the first inner ring groove (9). The spraying rod (10) has a channel hole (14) and a second hole (22) inside and on the side, respectively. The two ends of the second hole (22) are connected to the channel hole (14) and the first hole (13), respectively. The spraying rod (10) has a fixed outlet tube (15) inside, and the inner end of the outlet tube (15) is connected to the channel hole (14). The support plate (7) has a first flow channel (18) inside, and the first flow channel (18) is connected to the first inner ring groove (9). The outer surface of the spraying rod (10) is movably fitted with the pipe (4). The outer surface of the spraying rod (10) is fixedly fitted with a stepped cover (21), and the stepped cover (21) is movably fitted with the pipe (4).

2. The apparatus for preparing rubber linings for pipes according to claim 1, characterized in that: The top surface of the support plate (7) is fixedly installed with a feed box (20), and the top surface of the support plate (7) is provided with a feed hole (19). The upper and lower ends of the feed hole (19) are respectively connected to the feed box (20) and the first flow channel (18). The side surface of the support plate (7) is fixedly installed with a motor frame (16), and the inner surface of the motor frame (16) is fixedly installed with a motor (17).

3. The apparatus for preparing rubber linings for pipes according to claim 1, characterized in that: The spraying rod (10) has an installation hole (26) inside. The installation hole (26) is distributed in a ring inside the spraying rod (10). The inner surface of the installation hole (26) is fixedly sleeved with the outlet tube (15).

4. The apparatus for preparing rubber linings for pipes according to claim 1, characterized in that: The control box (2) is fixedly installed on the top surface of the base plate (1), and the mounting bolt (23) is threaded onto the front of the placement rack (3).

5. The apparatus for preparing rubber linings for pipes according to claim 1, characterized in that: The spraying rod (10) has an annular cavity (24) inside, and a heating tube (25) is fixedly installed inside the annular cavity (24). A partition (30) is fixedly connected to the inner surface of the annular cavity (24), and a side opening (37) is opened on the front of the partition (30).

6. The apparatus for preparing rubber linings for pipes according to claim 1, characterized in that: The support plate (7) has a second inner ring groove (31) inside, and the spray rod (10) has a second ring groove (29) on its outer surface. The spray rod (10) has an air inlet (27) and an air outlet (28) on both sides of its outer surface. The air inlet (27) and the air outlet (28) are connected to the second ring groove (29). The second inner ring groove (31) is located outside the second ring groove (29).

7. The apparatus for preparing rubber linings for pipes according to claim 1, characterized in that: The support plate (7) has a connecting hole (32) and a heat preservation cavity (33) respectively. The heat preservation cavity (33) is located outside the first flow channel (18). The two ends of the connecting hole (32) are connected to the heat preservation cavity (33) and the second inner ring groove (31) respectively. The inner side of the support plate (7) has an air outlet (34) connected to the heat preservation cavity (33).

8. The apparatus for preparing rubber linings for pipes according to claim 1, characterized in that: The front of the support plate (7) is fixedly connected to the mounting frame (35), and the inside of the mounting frame (35) is provided with a fan (36). The mounting frame (35) is connected to the air inlet (27).

9. A method for preparing a pipe rubber liner preparation apparatus according to any one of claims 1-8, characterized in that: The preparation steps include the following: Step 1: Place the pipe (4) in the top inner groove of the placement rack (3) and tighten the mounting bolts (23). Start the telescopic rod (6) to make the support plate (7) move laterally, so that the spraying rods (10) on both sides fit into the inside of the pipe (4) and the stepped cover (21) on the outer surface of the spraying rod (10) covers the pipe (4). Step 2: Inject the hot melt rubber raw liquid into the feed box (20), and enter the first inner ring groove (9) through the first flow channel (18). It also enters the channel hole (14) through the second hole (22) on the outer surface of the spray rod (10) and the first hole (13) on the mounting ring (11). It is sprayed onto the inner wall of the pipe (4) through the outlet pipe (15) connected to the channel hole (14). At the same time, the motor (17) is started, so that the spray rod (10) keeps rotating and continues to spray during the rotation. After the spraying is completed, it continues to rotate and the inner lining is cured and formed. Step 3: When hot melt rubber liquid is introduced, start the heating tube (25) to raise the temperature in the annular cavity (24) and stabilize the temperature of the hot melt rubber in the channel hole (14). Start the fan (36) to introduce air into the annular cavity (24). The air entering the annular cavity (24) moves along the upper and lower partitions (30) and enters the annular cavity (24) on the other side of the partition (30) through the side opening (37) on the partition (30). It then flows in reverse to the air outlet (28) and enters the heat preservation cavity (33) through the connecting hole (32) to stabilize the temperature of the hot melt rubber in the first flow channel (18). After the spraying is completed, keep the spraying rod (10) rotating, turn off the heating tube (25) and continue to start the fan (36) to blow ambient air into the spraying rod (10) so that the sprayed hot melt rubber can cool and solidify quickly.

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