A ductile iron pipe cement lining curing device

Abstract

The present invention discloses a device for curing cement linings of ductile iron pipes, comprising a closed cover and a cast pipe support component arranged inside the closed cover for supporting the cast pipe and driving it to move; the cast pipe support component comprises a driving wheel hinged above the side wall of the closed cover, a driven wheel hinged below the side wall of the closed cover, and a chain sleeved on the outside of the driving wheel and the driven wheel for following rotation; a plurality of chain claws are hinged on the chain at even intervals and can be opened and closed 90° following the rotation of the chain, and a longitudinal section of the chain claw comprises a right angle and a short right-angled side and a long right-angled side forming the right angle, the ridge where the right angle is located is the hinge point between the chain claw and the chain, the surface where the short right-angled side is located is the contact support surface between the chain claw and the chain, and the surface where the long right-angled side is located is the support surface of the cast pipe. The present invention can realize automatic transportation and automatic curing, does not require manual lifting and stacking, and can ensure the quality of the cement lining.

Description

Technical Field

[0001] The invention relates to a ductile iron pipe cement lining curing device, belonging to the technical field of ductile iron pipe curing devices. Background Art

[0002] Ductile iron pipes are made by centrifugally casting ductile iron at high speed using a centrifugal ductile iron machine, using molten iron of grade 18 or higher, after adding a nodulizer. They are primarily used for conveying tap water and are an ideal choice for water pipes. Their inner walls require a cement lining for corrosion resistance.

[0003] After applying the cement lining, curing is required. In the existing technology, this is done using a curing kiln for steam curing. An overhead crane is used to transport the cement-lined ductile iron pipes into the kiln, where they are stacked layer by layer (crisscrossing the stacking pattern). The pipes are then sealed and steam-cured for 7-8 hours. The overhead crane operation requires two people to tie knots and hooks, which is inefficient and labor-intensive. Furthermore, the lifting process can cause the pipes to bump against the ductile iron pipes, impacting the lining quality. In the curing kiln, the cement-lined ductile iron pipes are stacked layer by layer. The weight of the stacked pipes compresses the lower layers, impacting the quality of the cement lining and potentially causing cracks. Furthermore, the existing curing methods often result in pipes that have been cured first being brought online last, failing to meet production requirements for first-curing and first-passing. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a ductile iron pipe cement lining curing device, which can realize automatic transportation and automatic curing, does not require manual lifting and stacking, and can ensure the quality of the cement lining.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A device for curing cement linings of ductile iron pipes, comprising a closed cover and a pipe support component disposed within the closed cover for supporting the pipe and driving its movement; the pipe support component comprises a driving wheel hinged to the upper side wall of the closed cover, a driven wheel hinged to the lower side wall of the closed cover, and a chain sleeved outside the driving wheel and the driven wheel for rotating therewith; the chain is hinged to a plurality of chain claws at even intervals, each of which can be opened and closed 90 degrees in response to the rotation of the chain; a longitudinal section of the chain claw comprises a right angle, a short right-angled side forming the right angle, and a long right-angled side; the ridge at the right angle serves as the hinge point between the chain claw and the chain; the surface on which the short right-angled side is located serves as the contact and support surface between the chain claw and the chain; and the surface on which the long right-angled side is located serves as the support surface for the pipe.

[0007] The cast pipe support components are arranged in two groups at intervals in the horizontal direction to form a set of cast pipe support components, which respectively support the two ends of the cast pipe, and the two driving wheels in each set of cast pipe support components rotate in a linked manner;

[0008] A first conveyor belt for transporting the cast pipe from outside to inside to the chain claw is provided at the top end of the side wall of the closure cover, and an inlet for the cast pipe is opened on the side wall; two guide plates for guiding are provided at intervals on the forward extension line of the first conveyor belt and located between the two driving wheels in each set of cast pipe support components;

[0009] Steam pipes are evenly distributed on the side walls of the closed cover, and the steam pipes are connected to the steam main pipe through pipelines;

[0010] An outlet for transporting the cast pipe is provided at the bottom of the closed cover, where the cast pipe is unloaded from the chain claw, and a second conveyor belt for transporting the cured cast pipe to the next link is provided below the outlet.

[0011] A further improvement of the technical solution of the present invention is that the driving wheel and the driven wheel are hinged to the side wall of the closed cover through a support, and the driving wheel is driven to rotate by a motor fixed on the support, and the two motors in each set of cast pipe support components are arranged in a linkage.

[0012] A further improvement of the technical solution of the present invention is that the guide surface of the guide plate is arranged in an arc shape, and the guide plate is fixedly arranged on the support.

[0013] A further improvement of the technical solution of the present invention is that each of the chain claws can bear the weight of 2 to 3 cast pipes.

[0014] A further improvement of the technical solution of the present invention is that reinforcing ribs are provided on both sides of the root of the chain claw.

[0015] A further improvement of the technical solution of the present invention is that a compression spring having a shock-absorbing effect is fixedly provided on the non-hinged end of the contact support surface where the short right-angled side of the chain claw is located.

[0016] A further improvement of the technical solution of the present invention is that a rubber pad having a buffering effect is provided on the cast pipe support surface where the long right-angled side of the chain claw is located.

[0017] A further improvement of the technical solution of the present invention is that a hanging curtain is hung at the inlet position of the casting pipe on the closed cover.

[0018] A further improvement of the technical solution of the present invention is that a sealing cover made of flexible rubber material is provided at the outlet position of the cast pipe on the closing cover, and an opening is opened in the middle of the sealing cover so that the cast pipe can be deformed under the action of gravity so that the cast pipe can be drilled out, and can return to its original shape and close after the cast pipe is drilled out.

[0019] A further improvement of the technical solution of the present invention is that two sets of cast pipe support components are arranged in parallel in the closed cover, and each set of the cast pipe support components is provided with a first conveyor belt and a guide plate that match it.

[0020] Due to the adoption of the above technical solution, the technical advancements achieved by the present invention are:

[0021] The present invention can realize automation. Through the cooperation of the first conveyor belt, the cast pipe support component and the second conveyor belt, the cast pipe is automatically transported to the closed cover for curing, omitting the step of knotting and hooking, saving operation time and improving production efficiency. At the same time, it can also avoid the damage to the cement lining during the overhead crane lifting process in traditional curing, and avoid the damage to the cement lining of the bottom cast pipe when stacking layer by layer in the traditional curing process. At the same time, it can realize the production requirements of curing first and passing the line first that the traditional curing kiln does not have.

[0022] The two motors in each set of cast pipe support components of the present invention are linked to ensure that the driving wheels in each set of cast pipe support components rotate synchronously, ensuring that both ends of the cast pipe are in the same horizontal plane when curing on the chain claws.

[0023] The guide surface of the guide plate of the present invention is arranged in an arc shape. When the cast pipe rolls down, it will roll down along the guide surface, guiding the cast pipe and preventing the cast pipe from rolling to other places when it falls from the first conveyor belt to the chain claw.

[0024] The end of the cast pipe supporting surface of the chain claw of the present invention is tilted upward, which has a blocking effect on the cast pipe and prevents the cast pipe from rolling off the chain claw; at the same time, a rubber pad is provided on the cast pipe supporting surface, and a compression spring is fixedly provided on the non-hinged end in contact with the supporting surface. The cooperation of the rubber pad and the compression spring enables the cast pipe to play a shock-absorbing and buffering role when it falls onto the chain claw, preventing the impact force of the cast pipe when it falls from the chain claw from causing damage to the chain claw; reinforcing ribs are provided on both sides of the root of the chain claw to play a reinforcing role.

[0025] The curtain hung at the inlet of the casting pipe on the sealing cover of the present invention and the sealing cover arranged at the outlet both play a sealing role to ensure that the steam in the sealing cover escapes from here, thereby causing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 This is a horizontal position relationship diagram of the first conveyor belt, chain and guide plate of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the chain and chain claws of the present invention;

[0029] Among them, 1. motor, 2. chain, 3. driving wheel, 4. chain claw, 5. steam pipe, 6. closing cover, 7. first transmission belt, 8. driven wheel, 9. second transmission belt, 10. cast pipe, 11. guide plate, 12. compression spring. DETAILED DESCRIPTION

[0030] The present invention is described in further detail below in conjunction with the embodiments:

[0031] A device for curing the cement lining of ductile iron pipes can be automated. The cast pipes are automatically transported to a closed cover for curing through the cooperation of a first conveyor belt, a cast pipe support component and a second conveyor belt. The steps of knotting and hooking are omitted, operation time is saved, and production efficiency is improved. At the same time, the device can also avoid damage to the cement lining during the overhead crane lifting process in traditional curing, and avoid damage to the cement lining of the bottom cast pipe when stacking layer by layer in the traditional curing process. At the same time, it can realize the production requirements of curing first and passing the line first, which are not available in traditional curing kilns.

[0032] like Figure 1 As shown, the housing 6 includes a housing 6 and a housing support assembly disposed within the housing 6 for supporting and moving a cast pipe 10. The housing support assembly includes a driving wheel 3 hinged to the upper sidewall of the housing 6, a driven wheel 8 hinged to the lower sidewall of the housing 6, and a chain 2 sleeved around the driving wheel 3 and driven wheel 8 for rotation. The driving wheel 3 and driven wheel 8 are hinged to the sidewall of the housing 6 via a support, and the driving wheel 3 is driven by a motor 1 fixed to the support. The chain 2 is hinged to a plurality of chain claws 4 at regular intervals, each capable of opening and closing 90° as the chain 2 rotates. A longitudinal section of each chain claw 4 includes a right angle, a short right-angled side, and a long right-angled side. The right angle is the hinge point between the chain claw 4 and the chain 2. The short right-angled side is the contact support surface between the chain claw 4 and the chain 2, and the long right-angled side is the support surface for the cast pipe 10.

[0033] like Figure 3 As shown, the chain claw 4 is in a drooping state due to the action of gravity. At this time, the chain claw is in contact with the chain as a whole, saving space; after passing the top driving wheel 3, the chain claw 4 is in contact with the chain 2 under the action of gravity, and the contact support surface where the short right-angled side is located contacts the chain 2, playing a supporting role, so that the chain claw 4 is in a horizontal state, perpendicular to the chain 2. At this time, each chain claw can withstand the weight of 2-3 cast pipes 10; when the chain claw 4 moves to the bottom driven wheel, under the action of gravity, it returns to the state where the chain claw is in contact with the chain as a whole, and the cast pipe 10 is drilled out from the bottom outlet and enters the second conveyor belt 9 for transportation to the next link.

[0034] The cast pipe support surface, where the long right-angled side of the chain claw 4 lies, is equipped with a rubber cushion to provide a cushioning effect. The end of the cast pipe support surface is tilted upward to block the cast pipe and prevent it from rolling off the chain claw. A compression spring 12 is fixed to the non-hinged end of the contact support surface, where the short right-angled side of the chain claw 4 lies. The combination of the rubber cushion and the compression spring provides a shock-absorbing effect when the cast pipe falls onto the chain claw, preventing damage to the chain claw caused by the impact of the falling cast pipe. Reinforcing ribs are provided on both sides of the base of the chain claw 4 for added strength.

[0035] The cast pipe support components are arranged in two groups at intervals in the horizontal direction to form a set of cast pipe support components, which respectively support the two ends of the cast pipe 10, and the two motors 1 in each set of cast pipe support components are arranged in linkage, which can ensure that the rotation of the driving wheel in each set of cast pipe support components is synchronous, ensuring that the two ends of the cast pipe 10 are in the same horizontal plane when curing on the chain claws.

[0036] The top of the side wall of the closed cover 6 is provided with a first conveyor belt 7 for transporting the casting pipe 10 from the outside to the inside to the chain claw 4, and an entrance for the casting pipe 10 is opened on the side wall, and a hanging curtain is hung at the entrance position; on the extension line of the first conveyor belt 7 for forward transportation, two guide plates 11 for guiding are arranged at intervals between the two driving wheels 3 in each set of casting pipe support components, and the position relationship is as follows: Figure 2 shown.

[0037] Steam pipes 5 are evenly distributed on the side walls of the closed cover 6, and the steam pipes 5 are connected to the steam main pipe through a pipeline, so that the temperature inside the closed cover can reach 50-60°C, which is the required temperature for the curing process.

[0038] An outlet for the cast pipe 10 to be transported out is provided at the bottom of the closing cover 6, where the cast pipe 10 is unloaded from the chain claw 4, and a second conveyor belt 9 is provided below the outlet to transport the cured cast pipe 10 to the next link. A sealing cover made of a flexible rubber material is provided at the outlet position of the cast pipe 10 on the closing cover 6, and an opening slit is provided in the middle of the sealing cover so that the cast pipe 10 can be deformed under the action of gravity to allow the cast pipe to be drilled out, and can return to its original shape and close after the cast pipe is drilled out.

[0039] Two sets of cast pipe support components are arranged in parallel in the closed cover 6, and each set of the cast pipe support components is provided with a first conveyor belt 7 and a guide plate 11 matched therewith.

[0040] Directions:

[0041] After the ductile iron pipes are cement-lined, they are transported by the upper first conveyor belt 7 to the top of the chain within the enclosure 6. Driven by guide plates 11, they gradually roll onto and rest on the horizontal chain claw 4. Driven by the chain, the claw 4 moves downward once every cycle, ensuring that the pipes awaiting curing remain within the enclosure for the 7-8 hours of steam curing. As the claw moves from the top to the bottom driven pulley, the claw 4 gradually tilts from its horizontal position, lowering the steam-cured pipes to the lower second conveyor belt 9 for transport to the next process step.

[0042] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A ductile iron pipe cement lining curing device, characterized by: The invention comprises a closed cover (6) and a cast pipe supporting component arranged inside the closed cover (6) for supporting a cast pipe (10) and driving the cast pipe to move; the cast pipe supporting component comprises a driving wheel (3) hinged on the upper side wall of the closed cover (6), a driven wheel (8) hinged on the lower side wall of the closed cover (6), and a chain (2) sleeved on the outside of the driving wheel (3) and the driven wheel (8) for following the rotation; a plurality of chain claws (4) are hinged on the chain (2) at even intervals and can be opened and closed 90 degrees following the rotation of the chain (2); the longitudinal section of the chain claw (4) comprises a right angle and a short right angle side and a long right angle side forming the right angle; the ridge where the right angle is located is the hinge point of the chain claw (4) and the chain (2); the surface where the short right angle side is located is the contact support surface of the chain claw (4) and the chain (2); and the surface where the long right angle side is located is the support surface of the cast pipe (10); The cast pipe support components are arranged in two groups at intervals in the horizontal direction to form a set of cast pipe support components, which respectively support the two ends of the cast pipe (10), and the two driving wheels (3) in each set of cast pipe support components rotate in a linked manner; A first conveyor belt (7) for conveying the casting pipe (10) from outside to inside to the chain claw (4) is provided at the top end of the side wall of the closing cover (6), and an inlet for the casting pipe (10) to enter is opened on the side wall; two guide plates (11) for guiding are provided at intervals on the extension line of the first conveyor belt (7) for conveying forward, at a position between the two driving wheels (3) in each set of casting pipe support components; Steam pipes (5) are evenly distributed on the side walls of the closed cover (6), and the steam pipes (5) are connected to the steam main pipe through a pipeline; An outlet for transporting the cast pipe (10) is provided at the bottom of the closure cover (6) and at the position where the cast pipe (10) is unloaded from the chain claw (4), and a second conveyor belt (9) is provided below the outlet to transport the cured cast pipe (10) to the next link.

2. The device for curing the cement lining of a ductile iron pipe according to claim 1, characterized in that: The driving wheel (3) and the driven wheel (8) are hinged to the side wall of the closed cover (6) through a support, and the driving wheel (3) is driven to rotate by a motor (1) fixedly arranged on the support, and the two motors (1) in each set of cast pipe support components are arranged in a linkage manner.

3. The ductile iron pipe cement lining curing device according to claim 2, characterized in that: The guide surface of the guide plate (11) is arranged in an arc shape, and the guide plate (11) is fixedly arranged on the support.

4. The device for curing the cement lining of a ductile iron pipe according to claim 1, characterized in that: Each of the chain claws (4) can bear the weight of 2 to 3 cast pipes (10).

5. The device for curing the cement lining of a ductile iron pipe according to claim 4, characterized in that: Reinforcement ribs are provided on both sides of the root of the chain claw (4).

6. The device for curing the cement lining of a ductile iron pipe according to claim 1, characterized in that: A compression spring (12) having a shock-absorbing effect is fixedly provided on the non-hinged end of the contact support surface where the short right-angled side of the chain claw (4) is located.

7. The device for curing the cement lining of a ductile iron pipe according to claim 1, characterized in that: A rubber pad having a buffering effect is provided on the cast pipe support surface where the long right-angled side of the chain claw (4) is located, and the end of the cast pipe support surface is tilted upward.

8. The device for curing the cement lining of a ductile iron pipe according to claim 1, characterized in that: A hanging curtain is hung at the inlet position of the casting pipe (10) on the closing cover (6).

9. The device for curing the cement lining of a ductile iron pipe according to claim 1, characterized in that: A sealing cover made of a flexible rubber material is provided at the outlet position of the cast pipe (10) on the closing cover (6), and an opening is provided in the middle of the sealing cover so that the cast pipe (10) can be deformed under the action of gravity to allow the cast pipe to be drilled out, and can return to its original shape and close after the cast pipe is drilled out.

10. The device for curing the cement lining of a ductile iron pipe according to claim 1, characterized in that: Two sets of cast pipe support components are arranged in parallel in the closed cover (6), and each set of the cast pipe support components is provided with a first conveyor belt (7) and a guide plate (11) that match it.

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