Pipe fitting casting equipment and casting method

Abstract

The present invention belongs to the technical field of pipe processing and forming, and in particular to a pipe casting and forming device and a casting and forming method. In view of the problems that the existing slurry cannot be fully and evenly filled into the mold, the manual application of the release agent is inefficient and there are smearing holes, and the pipe molding is time-consuming, the following scheme is proposed, including a base, a U-shaped frame is fixed on the top of the base, a rotating column is rotatably connected between the top of the base and the inner wall of the top of the U-shaped frame, the outer wall of the rotating column is fixedly sleeved with a rotating seat that rotates on the top of the base, a plurality of circular holes are provided on the top of the rotating seat, and a first motor is fixed in the base. In the present invention, the slurry can be evenly cast in the casting cavity by rotating the inner mold relative to the outer mold, thereby avoiding the hollow phenomenon, and the slurry in the casting cavity is heated through the inclined hole in the later stage to accelerate the molding speed of the slurry.

Description

Technical Field

[0001] The invention relates to the technical field of pipe fitting processing and forming, and in particular to a pipe fitting casting and forming equipment and a casting and forming method. Background Art

[0002] Cement pipes are also called cement pressure pipes and reinforced concrete pipes. They are widely used in the sewer system in urban construction for sewage and flood control. At the same time, they are also often used as water pipes in some special factories, mines and farmland wells. In the production and processing of today's cement pipes, a skeleton needs to be placed in the mold and cement is cast to form it.

[0003] However, the prior art still has the following disadvantages in the process of pipe pouring:

[0004] 1. During pouring, the slurry cannot be fully and evenly poured into the mold, resulting in voids inside the pipeline later;

[0005] 2. Before pouring, it is necessary to manually apply the release agent on the inner wall of the outer mold. Manual application is not only inefficient, but also prone to uneven application or omissions, which affects the smooth demoulding in the later stage;

[0006] 3. After pouring, the pipe fittings need to be left to stand for a period of time before demoulding, which will undoubtedly reduce the pouring efficiency of the pipe fittings.

[0007] In view of the above problems, the present invention document proposes a pipe casting molding device and a casting molding method. Summary of the invention

[0008] The purpose of the present invention is to solve the shortcomings of the existing slurry that cannot be fully and evenly filled into the mold, the low efficiency of manual application of release agent and the existence of application holes, and the time-consuming pipe molding, and to propose a pipe casting molding equipment and casting molding method.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A pipe casting and molding device comprises a base, a U-shaped frame is fixed on the top of the base, a rotating column is rotatably connected between the top of the base and the inner wall of the top of the U-shaped frame, a rotating seat that rotates on the top of the base is fixedly sleeved on the outer wall of the rotating column, a plurality of circular holes are arranged on the top of the rotating seat, a first motor is fixed in the base, and the output shaft of the first motor is fixedly connected to the bottom end of the rotating column through a coupling;

[0011] It also includes a bottom mold, which is placed on the top of the rotating seat, the bottom mold is matched with the circular hole, and a steel mesh is placed on the top of the bottom mold;

[0012] It also includes a plurality of fixed arms, each of which is fixed to the outer wall of the rotating column, and an outer mold and an inner mold are provided below each of the fixed arms, and the inner mold is located inside the outer mold, and a casting cavity is formed between the inner mold and the outer mold for casting slurry and curing to form a pipe fitting, and the inner mold, the outer mold and the bottom mold cooperate;

[0013] The casting structure is arranged below the fixed arm and is used to drive the outer mold and the inner mold to move downward and cooperate with the bottom mold to complete the casting operation of the pipe fittings;

[0014] The molding structure is arranged in the base and is used to accelerate the molding and solidification of the slurry in the casting cavity;

[0015] The smearing structure is arranged on the top of the base and is used to automatically smear the release agent to the inner wall of the outer mold and the outer wall of the inner mold to facilitate the later demoulding.

[0016] The cam is an axially movable member which is adapted to move the load-carrying mechanism together with the support frame, and the cam is adapted to move the load-carrying mechanism together with the support frame. The inner mold is driven to rotate by the retaining ring through the multi-way tube, a retaining ring is arranged in the casting cavity, and the retaining ring rotating sleeve is arranged on the outer wall of the inner mold, the retaining ring is fixed on the inner wall of the outer mold, the slurry is limited by the outer mold, a plurality of feeding grooves for injecting slurry are arranged in the retaining ring, the outer wall fixed sleeve of the feeding pipe is provided with a gear ring, the bottom of the sliding plate is fixed with a third motor, and the output shaft of the third motor is fixed with a gear meshing with the gear ring; the outer mold and the inner mold move down to the top of the bottom mold, the slurry falls on the retaining ring through the multi-way tube, the third motor drives the feeding pipe to rotate through the cooperation of the gear and the gear ring, the feeding pipe drives the inner mold to rotate, the multi-way tube evenly sprinkles the slurry on the retaining ring, and the scraper scrapes the slurry on the retaining ring into the feeding groove, in addition, when the first rotating ring and the inner mold rotate, since the brake plate abuts against the top of the second rotating ring, the outer mold is in a stationary state, and the inner mold rotates relative to the outer mold, so that the slurry can be evenly injected into the cavity between the outer mold and the inner mold, so that the slurry is evenly filled to avoid hollowing.

[0017] In one possible design, the molding structure includes two partitions fixed in the inner mold and arranged in an upper and lower manner. An injection hole is provided in the lower partition, and the injection hole cooperates with the circular hole. An injection pipe is fixedly passed through the base, and the end of the injection pipe away from the base is connected to an external steam generating device for injecting steam. The top of the injection pipe is connected to one of the circular holes, and the injection pipe injects steam into the inner mold through the circular hole and the injection hole. A plurality of inclined holes are provided on the outer wall of the inner mold for heating and curing the slurry in the casting cavity by steam; the rotating column drives the rotating seat and the sliding plate to rotate synchronously until the circular hole moves to the top of the injection pipe, and the external steam generating device injects steam into the circular hole through the injection pipe, and the steam is injected into the inner mold through the injection hole, and the slurry in the casting cavity is heated through the inclined hole to accelerate the molding and curing of the slurry.

[0018] In a possible design, the coating structure includes a liquid storage tank fixed on the top of the base, a water pump is fixed on the top of the liquid storage tank, the liquid inlet end of the water pump is connected to the liquid storage tank through a hose, an electric push rod is fixed to the inner wall of one side of the U-shaped frame, the output shaft of the electric push rod is fixed to a liquid spraying pipe, the electric push rod drives the liquid spraying pipe to move to make way for the guide rod, the liquid outlet end of the water pump is connected to the bottom end of the liquid spraying pipe through a hose, and nozzles are fixed on both sides of the liquid spraying pipe for spraying the release agent on the outer wall of the inner mold and the inner wall of the outer mold, and the two nozzles are located on both sides of the top of the liquid spraying pipe; The output shaft of the electric push rod pushes the spray pipe to move toward the middle until it moves to the bottom of the casting cavity. The second motor continues to drive the sliding plate downward through the screw rod. The feed pipe drives the first rotating ring and the inner mold to rotate. The first rotating ring drives the outer mold to rotate through the second rotating ring. The release agent in the storage tank is sprayed onto the inner wall of the outer mold and the outer wall of the inner mold through the nozzle through the water pump. The outer mold and the inner mold rotate synchronously. The release agent can be evenly sprayed on the outer mold and the inner mold through the nozzle to avoid smearing holes, which is convenient for the later casting operation.

[0019] In a possible design, the smearing structure also includes an arc-shaped strip fixed to the inner wall of one side of the U-shaped frame, and the arc-shaped strip is located above the electric push rod, a moving hole is provided in the sliding plate, a guide rod is fixed in the moving hole, a brake plate is provided on the outer wall sliding sleeve of the guide rod, and the brake plate slides in the moving hole, a first spring fixedly connected to the brake plate is provided on the outer wall sleeve of the guide rod, an end of the first spring away from the brake plate is fixedly connected to the inner wall of one side of the moving hole, a moving frame is fixed on the side of the brake plate away from the rotating column, and the moving frame slides on the top of the sliding plate, the moving frame cooperates with the arc-shaped strip to drive the brake plate to move, a rubber block is fixed at the bottom of the brake plate, which is used to increase the friction between the brake plate and the second rotating ring and brake the second rotating ring, and a first spring is provided in the moving frame. There is a clearance hole, and the top end of the guide rod passes through the clearance hole; the rotating column continues to drive the rotating seat and the sliding plate to rotate, and the moving frame moves toward the middle under the push and squeeze of the arc strip, and the brake plate moves from the second rotating ring to the first rotating ring, and the thickness of the first rotating ring is less than the thickness of the second rotating ring, so the brake plate does not contact the first rotating ring, and when the sliding plate moves down, the feed pipe drives the first rotating ring and the inner mold to rotate, and the first rotating ring drives the outer mold to rotate through the second rotating ring, and the release agent in the liquid storage tank is sprayed to the inner wall of the outer mold and the outer wall of the inner mold through the nozzle through the water pump, and the outer mold and the inner mold rotate synchronously, and the release agent can be evenly sprayed on the outer mold and the inner mold through the nozzle to avoid the smearing hole phenomenon, which is convenient for the later casting operation.

[0020] In one possible design, the thickness of the first rotating ring is smaller than that of the second rotating ring, so as to prevent the brake plate from contacting the first rotating ring; the brake plate moves from the second rotating ring to the first rotating ring, and the thickness of the first rotating ring is smaller than that of the second rotating ring, so the brake plate does not contact the first rotating ring, and therefore the first rotating ring can drive the second rotating ring to rotate, making it easier for the nozzle to spray the release agent on the inner wall of the outer mold and the outer wall of the inner mold.

[0021] In one possible design, a barrel is fixed to the top of the U-shaped frame, a discharge pipe is fixed to the bottom end of the barrel, and the bottom end of the discharge pipe passes through the top inner wall of the U-shaped frame, an electromagnetic valve is provided on the outer wall of the discharge pipe, a feed hopper is fixed to the top of the fixed arm for receiving the slurry discharged from the discharge pipe, a bellows is fixed to the bottom end of the feed hopper, and the bottom end of the bellows extends into the feed pipe and is rotatably connected to the inner wall of the feed pipe, so as to smoothly inject the slurry into the feed pipe after the feed pipe moves downward.

[0022] In one possible design, a plurality of scrapers are fixed to the outer wall of the inner mold for scraping the slurry on the retaining ring into the feed trough. A limiting ring is provided on the top of the rotating seat, and the limiting ring cooperates with the outer mold for positioning the outer mold.

[0023] In a possible design, a plurality of positioning structures for positioning the bottom mold are provided on the top of the rotating seat;

[0024] The positioning structure includes a plurality of limit blocks fixed on the top of the rotating seat, and the limit blocks are used to limit the bottom mold. Two fixed seats are fixed on the top of the rotating seat, and the two fixed seats are located on both sides of the bottom mold. Sliding rods are slidably penetrated in the two fixed seats, and an L-shaped positioning plate is fixed on the ends of the two sliding rods close to each other. A second spring is fixed on the sides of the two L-shaped positioning plates away from each other, and the end of the second spring away from the L-shaped positioning plate is fixedly connected to the corresponding fixed seat, and the second spring is sleeved on the outer wall of the corresponding sliding rod for driving the L-shaped positioning plate to reset. Positioning grooves are provided on both sides of the bottom mold, and the positioning grooves cooperate with the L-shaped positioning plates. A first inclined surface is provided on one side of the L-shaped positioning plate, which is used for the L-shaped positioning plate to be smoothly inserted into the positioning groove when the bottom mold moves. A second inclined surface is provided on the bottom of one side of the L-shaped positioning plate, which is used for When the mold moves upward, the brake of the L-shaped positioning plate on the bottom mold is released, and two sockets are provided in the bottom mold, so that the fork plate of the forklift can be inserted into the sockets to lift the bottom mold upward; the bottom mold is placed on the rotating seat, and the rotating seat is pushed toward the middle, and when the bottom mold moves, the cooperation between the bottom mold and the first inclined surface pushes the L-shaped positioning plate to both sides until the limit block limits it, and the L-shaped positioning plate is just aligned with the positioning groove. The L-shaped positioning plate is plugged and matched with the positioning groove under the elastic force of the second spring, and the bottom mold is initially fixed to avoid displacement of the bottom mold during the later pouring of slurry. In addition, the fork plate of the forklift is inserted into the socket, and then the bottom mold and the pipe fittings are lifted upward by the fork plate. The cooperation of the positioning groove and the second inclined surface pushes the L-shaped positioning plate to move outward, thereby releasing the brake of the L-shaped positioning plate on the bottom mold, and the bottom mold and the pipe fittings thereon can be moved out.

[0025] In the present application, a casting method using a pipe casting device comprises the following steps:

[0026] S1. Place the bottom mold on the rotating seat and push it to the limit position. During the process, the L-shaped positioning plate is pushed outward by the bottom mold until it is plugged into the positioning groove after the limit position, thereby preliminarily fixing the bottom mold;

[0027] S2, the first motor drives the rotating seat and the outer mold to rotate to the bottom of the barrel, and the second motor drives the sliding plate, the feed pipe, the outer mold and the inner mold to descend through the screw rod, so that the inner and outer molds are matched with the bottom mold; the slurry is evenly injected from the barrel through the feed hopper, the feed pipe, and the multi-way pipe into the casting cavity, and the inner mold rotates to promote uniform filling of the slurry;

[0028] S3, the rotating seat drives the sliding plate to rotate above the gas injection pipe, and the steam heats the slurry through the gas injection hole and the inclined hole of the inner mold to accelerate the molding and curing. The rotation of the inner mold ensures uniform steam heating;

[0029] S4. After the slurry solidifies, the screw drives the sliding plate to rise and demould, and the inner mold rotates to prevent the pipe from sticking; then, the brake plate moves to the first rotating ring, the electric push rod pushes the spray pipe to the bottom of the casting cavity, and the water pump sprays the demoulding agent evenly to the inner wall of the outer mold and the outer wall of the inner mold through the nozzle;

[0030] S5. After the cured pipe fittings are placed on the bottom mold, the forklift fork is inserted into the socket to lift the bottom mold. The L-shaped positioning plate is pushed outward by the second inclined surface to release the brake on the bottom mold, making it easier to remove the bottom mold and the pipe fittings.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] In the present invention, a feed pipe is rotatably penetrated in the sliding plate, and the outer wall of the feed pipe passes through a plurality of fixed rods, and a first rotating ring is fixed to the plurality of fixed rods, and a second rotating ring is rotatably sleeved on the outer wall of the first rotating ring, and the top of the outer mold is fixed to the bottom of the second rotating ring, and the bottom end of the feed pipe is fixedly connected to the inner mold through a multi-way pipe, and a retaining ring is rotatably sleeved on the outer wall of the inner mold and fixed to the inner wall of the outer mold; the feed pipe drives the inner mold to rotate, and the multi-way pipe evenly sprinkles the slurry on the retaining ring, and the scraper scrapes the slurry on the retaining ring into the feed trough, and the inner mold rotates, thereby being able to evenly inject the slurry into the cavity between the outer mold and the inner mold, and in addition, the rotation of the inner mold can evenly fill the slurry in the casting cavity to avoid hollowing;

[0033] In the present invention, the molding structure includes two partitions fixed in the inner mold and arranged up and down, an air injection hole is provided in the lower partition, an air injection pipe is fixedly passed through the base, and a plurality of inclined holes are provided on the outer wall of the inner mold; an external steam generating device injects steam into the circular hole through the air injection pipe, and the steam is injected into the inner mold through the air injection hole, and the slurry in the casting cavity is heated through the inclined hole to accelerate the molding and curing of the slurry;

[0034] In the present invention, an electric push rod is fixed to the inner wall of one side of the U-shaped frame, and a liquid spraying pipe is fixed to the output shaft of the electric push rod, and nozzles are fixed on both sides of the liquid spraying pipe; the output shaft of the electric push rod pushes the liquid spraying pipe to move toward the middle until the liquid spraying pipe moves to the bottom of the casting cavity, and the second motor drives the sliding plate to move downward through the screw rod, and the feed pipe drives the first rotating ring, the inner mold and the outer mold to rotate, and the mold release agent in the liquid storage tank is sprayed to the inner wall of the outer mold and the outer wall of the inner mold through the nozzle through the water pump, and the outer mold and the inner mold rotate synchronously, and the mold release agent can be evenly sprayed on the outer mold and the inner mold through the nozzle, so as to avoid the occurrence of smearing holes, which is convenient for the later casting operation;

[0035] In the present invention, the coating structure also includes an arc-shaped strip fixed to the inner wall of one side of the U-shaped frame, a brake plate is provided on the sliding sleeve of the outer wall of the guide rod, a moving frame matched with the arc-shaped strip is fixed on one side of the brake plate, and the thickness of the first rotating ring is less than that of the second rotating ring; the moving frame moves toward the middle under the pushing and squeezing of the arc-shaped strip, and the brake plate moves from the second rotating ring to the first rotating ring to release the brake on the second rotating ring, so that the first rotating ring can drive the second rotating ring to rotate later, so that the spray head can evenly spray the release agent on the outer mold and the inner mold, avoiding the occurrence of coating holes, and facilitating the casting operation again later;

[0036] In the present invention, the inner mold is rotated relative to the outer mold, so that the slurry can be evenly poured in the pouring cavity to avoid hollowing. In the later stage, the slurry in the pouring cavity is heated through the inclined hole to accelerate the forming speed of the slurry. In addition, the cooperation between the moving frame and the arc strip can make the outer mold and the inner mold rotate synchronously, which is convenient for the nozzle to evenly spray the release agent on the outer mold and the inner mold in the later stage to avoid the smearing gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the three-dimensional structure of a pipe casting and molding device provided in Example 1 of the present invention;

[0038] Figure 2 A schematic diagram of a three-dimensional exploded structure of a pipe casting and molding device provided in Example 1 of the present invention;

[0039] Figure 3 A schematic diagram of a three-dimensional cross-sectional structure of a U-shaped frame of a pipe casting and molding equipment provided in Example 1 of the present invention;

[0040] Figure 4 A schematic diagram of a three-dimensional explosion structure of a bottom mold and a steel mesh of a pipe casting and molding equipment provided in Example 1 of the present invention;

[0041] Figure 5 A schematic cross-sectional view of a sliding plate, a fixed arm and an outer mold of a pipe casting and molding device provided in Example 1 of the present invention;

[0042] Figure 6 A schematic diagram of the three-dimensional structure of a fixed arm, a sliding plate, a second rotating ring and an outer mold of a pipe casting and molding device provided in Example 1 of the present invention;

[0043] Figure 7 A schematic diagram of a three-dimensional exploded structure of a sliding plate, a second rotating ring and an outer mold of a pipe casting and molding device provided in Example 1 of the present invention;

[0044] Figure 8A schematic diagram of the three-dimensional structure of an inner mold, a retaining ring and a scraper of a pipe casting and molding device provided in Example 1 of the present invention;

[0045] Fig. 9 A schematic diagram of a three-dimensional cross-sectional structure of a sliding plate of a pipe casting and molding device provided in Example 1 of the present invention;

[0046] Fig.10 A schematic cross-sectional view of a rotating seat, a base and an inner mold of a pipe casting and molding device provided in Example 1 of the present invention;

[0047] Fig.11 A schematic diagram of the three-dimensional structure of the cooperation between the limit block and the bottom mold of a pipe casting and molding equipment provided in Example 2 of the present invention;

[0048] Fig.12 This is a schematic diagram of the three-dimensional exploded structure of a bottom mold and an L-shaped positioning plate of a pipe casting and molding equipment provided in Example 2 of the present invention.

[0049] In the figure: 1, base; 2, U-shaped frame; 3, rotating column; 4, first motor; 5, rotating seat; 6, round hole; 7, bottom mold; 8, limit ring; 9, steel mesh; 10, barrel; 11, fixed arm; 12, screw rod; 13, guide rod; 14, second motor; 15, sliding plate; 16, feed hopper; 17, feed pipe; 18, gear ring; 19, third motor; 20, gear; 21, fixed rod; 22, first rotating ring; 23, second rotating ring; 24, outer mold; 25, multi-way pipe; 26, inner mold; 27, retaining ring; 28 , feed trough; 29, scraper; 30, arc strip; 31, moving hole; 32, guide rod; 33, first spring; 34, brake plate; 35, moving frame; 36, electric push rod; 37, spray pipe; 38, nozzle; 39, water pump; 40, liquid storage tank; 41, air injection pipe; 42, partition; 43, air injection hole; 44, inclined hole; 45, limit block; 46, socket; 47, positioning groove; 48, fixed seat; 49, sliding rod; 50, second spring; 51, L-shaped positioning plate; 52, first inclined surface; 53, second inclined surface. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0051] Example 1: Reference Figure 1 and Figure 2, molding equipment, which is used in the field of cement pipe processing. The pipe casting and molding equipment includes a base 1, and a U-shaped frame 2 is installed on the top of the base 1 by bolts or other fixing methods. A rotating column 3 is rotatably connected between the top center of the base 1 and the top inner wall of the U-shaped frame 2 through a bearing, and a rotating seat 5 is fixedly sleeved on the outer wall of the rotating column 3, and the rotating seat 5 can rotate on the top of the base 1. A plurality of circular holes 6 are evenly opened on the top of the rotating seat 5. A first motor 4 is fixed in the base 1, and the output shaft of the first motor 4 is fixedly connected to the bottom end of the rotating column 3 through a coupling, so when the first motor 4 is started, the rotating column 3 and the rotating seat 5 can be driven to rotate.

[0052] Reference Figure 1-Figure 4 A bottom mold 7 is placed on the top of the rotating seat 5. The shape of the bottom mold 7 matches the circular hole 6, so that the bottom mold 7 can be stably placed on the rotating seat 5. The top of the bottom mold 7 is used to place a steel mesh 9, which is used to enhance the strength of the final formed pipe fitting.

[0053] Reference Figure 1 , Figure 3 and Figure 5 A plurality of fixed arms 11 are fixed to the outer wall of the rotating column 3, and the fixed arms 11 are evenly distributed along the circumference of the rotating column 3. An outer mold 24 and an inner mold 26 are arranged below each fixed arm 11, and the inner mold 26 is located inside the outer mold 24, and a casting cavity is formed between the two. When the bottom mold 7 is placed on the rotating seat 5, the outer mold 24 and the inner mold 26 can cooperate with the bottom mold 7 to form a complete pipe fitting mold.

[0054] Reference Figure 5-Figure 8 In order to realize the downward movement of the outer mold 24 and the inner mold 26 and cooperate with the bottom mold 7, the device also includes a casting structure. The casting structure specifically includes a sliding plate 15 arranged below the fixed arm 11, and one end of the sliding plate 15 can slide on the outer wall of the rotating column 3. The bottom side of the fixed arm 11 is rotatably connected with a screw rod 12 through a bearing, and the screw rod 12 and the sliding plate 15 are connected by a thread. The bottom end of the screw rod 12 is also rotatably connected to the top of the rotating seat 5 through a bearing, and the top of the fixed arm 11 is fixed with a second motor 14 through a frame, and the output shaft of the second motor 14 is fixedly connected to the top of the screw rod 12 through a coupling. Therefore, when the second motor 14 is started, the screw rod 12 can be driven to rotate, thereby driving the sliding plate 15 to rise and fall. At the same time, in order to increase the stability of the lifting and lowering of the sliding plate 15, the same guide rod 13 is also fixed between the bottom of the fixed arm 11 and the top of the rotating seat 5, and the guide rod 13 slides through the sliding plate 15.

[0055] Reference Figure 5 , Figure 7 and Figure 8A feed pipe 17 is rotatably passed through the sliding plate 15, and a plurality of fixed rods 21 located below the sliding plate 15 are fixed to the outer wall of the feed pipe 17, and a first rotating ring 22 is fixed to one end of these fixed rods 21 away from each other. A second rotating ring 23 is rotatably sleeved on the outer wall of the first rotating ring 22, and the top of the outer mold 24 is fixed to the bottom of the second rotating ring 23. A multi-way tube 25 is fixed to the bottom end of the feed pipe 17, and one end of the multi-way tube 25 away from the retaining ring 27 is fixed and passes through the inner mold 26. The retaining ring 27 is rotatably sleeved on the outer wall of the inner mold 26 and fixed to the inner wall of the outer mold 24, and is used to limit the slurry. A retaining ring 27 is also provided in the casting cavity, and a plurality of feed troughs 28 for injecting slurry are provided in the retaining ring 27.

[0056] Reference Figure 5-Figure 9 , the outer wall of the feed tube 17 is also fixedly sleeved with a gear ring 18, and the bottom of the sliding plate 15 is fixed with a third motor 19, and the output shaft of the third motor 19 is fixed with a gear 20 meshing with the gear ring 18. Therefore, when the third motor 19 is started, it can drive the gear 20 to rotate, and then drive the feed tube 17 to rotate through the gear ring 18. Since the multi-way tube 25 is fixedly connected to the inner mold 26, the rotation of the feed tube 17 will drive the inner mold 26 to rotate. At the same time, in order to limit the rotation of the outer mold 24, a brake plate 34 is also set on the top of the second rotating ring 23. The brake plate 34 is fixedly set in an appropriate position to resist the second rotating ring 23 when the outer mold 24 and the inner mold 26 rotate, so that the outer mold 24 remains stationary.

[0057] Specifically, when the outer mold 24 and the inner mold 26 move down to the top of the bottom mold 7, the slurry can fall on the retaining ring 27 through the multi-way pipe 25. At this time, the third motor 19 is started, and the gear 20 and the gear ring 18 cooperate to drive the feed pipe 17 to rotate, thereby driving the inner mold 26 to rotate. The multi-way pipe 25 evenly sprinkles the slurry on the retaining ring 27, and scrapes the slurry on the retaining ring 27 into the feed trough 28 through the scraper 29. Since the outer mold 24 remains stationary and the inner mold 26 rotates relative to the outer mold 24, the slurry can be evenly injected into the cavity between the outer mold 24 and the inner mold 26, so that the slurry is evenly filled to avoid hollowing.

[0058] Reference Figure 2 and Fig.10In addition, the device also includes a molding structure for accelerating the molding and solidification of the slurry in the casting cavity. The molding structure specifically includes two partitions 42 fixed in the inner mold 26 and arranged in an upper and lower manner. The partition 42 located at the bottom is provided with an injection hole 43, and the injection hole 43 cooperates with the circular hole 6. An injection pipe 41 is fixedly passed through the base 1, and the end of the injection pipe 41 away from the base 1 is connected to an external steam generating device for injecting steam. The top of the injection pipe 41 is connected to one of the circular holes 6, so when the rotating column 3 drives the rotating seat 5 to rotate to an appropriate position, the injection pipe 41 can inject steam into the inner mold 26 through the circular hole 6 and the injection hole 43. The outer wall of the inner mold 26 is also provided with a plurality of inclined holes 44, which are used to heat and solidify the slurry in the casting cavity by steam.

[0059] Specifically, after the pipe casting operation is completed, the rotating column 3 will continue to drive the rotating seat 5 and the sliding plate 15 to rotate synchronously until the circular hole 6 moves to the top of the gas injection pipe 41. At this time, the external steam generating device injects steam into the circular hole 6 through the gas injection pipe 41, and the steam is injected into the inner mold 26 through the gas injection hole 43, and the slurry in the casting cavity is heated through the inclined hole 44, thereby accelerating the molding and curing of the slurry.

[0060] Reference Figure 1-Figure 3 Finally, in order to facilitate the demoulding in the later stage, the present device is also provided with a coating structure on the top of the base 1, which is used to automatically coat the mold release agent on the inner wall of the outer mold 24 and the outer wall of the inner mold 26. The coating structure includes a liquid storage tank 40 fixedly installed on the top of the base 1, and the liquid storage tank 40 is used to store the mold release agent. A water pump 39 is fixedly connected to the top of the liquid storage tank 40, and the liquid inlet end of the water pump 39 is connected to the inside of the liquid storage tank 40 through a hose so as to extract the mold release agent.

[0061] Reference Figure 1-Figure 3 On one side inner wall of the U-shaped frame 2, an electric push rod 36 is fixedly installed. A liquid spraying pipe 37 is fixedly connected to the output shaft of the electric push rod 36, and the liquid spraying pipe 37 can move with the extension and contraction of the output shaft of the electric push rod 36. The main function of the electric push rod 36 is to drive the liquid spraying pipe 37 to move, provide a space for the guide rod 13, and also move the liquid spraying pipe 37 to the bottom of the casting cavity. The liquid outlet end of the water pump 39 is also connected to the bottom end of the liquid spraying pipe 37 through a hose, so that the release agent can be drawn out from the liquid storage tank 40, and after being pressurized by the water pump 39, it is sprayed through the liquid spraying pipe 37.

[0062] Reference Figure 1-Figure 3 On both sides of the liquid spraying pipe 37 , spray heads 38 are fixedly installed. The two spray heads 38 are located on both sides of the top of the liquid spraying pipe 37 and are mainly used to spray the release agent on the outer wall of the inner mold 26 and the inner wall of the outer mold 24 .

[0063] Specifically, when the output shaft of the electric push rod 36 pushes the spray pipe 37 to move toward the middle until the spray pipe 37 moves to the bottom of the casting cavity, the second motor 14 continues to drive the sliding plate 15 to move downward through the screw 12. At this time, the feed pipe 17 will drive the first rotating ring 22 and the inner mold 26 to rotate, and the first rotating ring 22 will drive the outer mold 24 to rotate through the second rotating ring 23. After the water pump 39 pressurizes the release agent in the liquid storage tank 40, it is sprayed onto the inner wall of the outer mold 24 and the outer wall of the inner mold 26 through the nozzle 38. Since the outer mold 24 and the inner mold 26 rotate synchronously, the nozzle 38 can evenly spray the release agent onto the inner wall of the outer mold 24 and the outer wall of the inner mold 26 to avoid the occurrence of smearing holes, thereby facilitating the casting operation again in the later stage.

[0064] Reference Figure 1 , Figure 3 and Fig. 9 In addition, in order to rotate the outer mold 24 and the inner mold 26 synchronously so as to spray the release agent more accurately, the present embodiment also fixes an arc strip 30 on the inner wall of one side of the U-shaped frame 2, and the arc strip 30 is located above the electric push rod 36. A moving hole 31 is provided in the sliding plate 15, and a guide rod 32 is fixed in the moving hole 31. A brake plate 34 is slidingly sleeved on the outer wall of the guide rod 32, and the brake plate 34 can slide on the guide rod 32 and slide in the moving hole 31. A first spring 33 fixedly connected to the brake plate 34 is also sleeved on the outer wall of the guide rod 32, and one end of the first spring 33 away from the brake plate 34 is fixedly connected to the inner wall of one side of the moving hole 31. In this way, when the brake plate 34 is subjected to external force, it can slide on the guide rod 32 and compress or stretch the first spring 33.

[0065] Reference Figure 1 , Figure 3 and Fig. 9 , a moving frame 35 is fixedly connected to the side of the brake plate 34 away from the rotating column 3, and the moving frame 35 slides on the top of the sliding plate 15. When the rotating column 3 drives the rotating seat 5 and the sliding plate 15 to rotate, the moving frame 35 will move to the middle under the pushing and squeezing of the arc strip 30. At this time, the brake plate 34 will move from the second rotating ring 23 to the first rotating ring 22. Since the thickness of the first rotating ring 22 is less than that of the second rotating ring 23, the brake plate 34 does not contact the first rotating ring 22.

[0066] Specifically, when the sliding plate 15 moves downward, the feed pipe 17 can drive the first rotating ring 22 and the inner mold 26 to rotate, and the first rotating ring 22 drives the outer mold 24 to rotate through the second rotating ring 23. At the same time, the water pump 39 sprays the mold release agent in the liquid storage tank 40 onto the inner wall of the outer mold 24 and the outer wall of the inner mold 26 through the spray head 38. Since the outer mold 24 and the inner mold 26 rotate synchronously, the spray head 38 can evenly spray the mold release agent onto the inner wall of the outer mold 24 and the outer wall of the inner mold 26.

[0067] Reference Fig. 9 In addition, in order to increase the friction between the brake plate 34 and the second rotating ring 23 so as to better brake the second rotating ring 23, a rubber block is fixed to the bottom of the brake plate 34. In this way, when the brake plate 34 contacts the second rotating ring 23, the rubber block can increase the friction between the two, thereby improving the stability and reliability of braking.

[0068] Reference Figure 1-Figure 3 A barrel 10 is fixed on the top of the U-shaped frame 2, and the barrel 10 is used to store the slurry required for casting pipe fittings. A discharge pipe for discharging is fixed at the bottom end of the barrel 10, and the bottom end of the discharge pipe penetrates the top inner wall of the U-shaped frame 2 so that the slurry can be discharged smoothly. A solenoid valve is provided on the outer wall of the discharge pipe, and the discharge of the slurry can be controlled by controlling the opening and closing of the solenoid valve.

[0069] Reference Figure 5 A feed hopper 16 is fixed on the top of the fixed arm 11. The feed hopper 16 is designed to receive the slurry discharged from the discharge pipe. A bellows is fixed at the bottom of the feed hopper 16, and the bottom of the bellows extends into the feed pipe 17 and is rotatably connected to the inner wall of the feed pipe 17. This design enables the bellows to smoothly inject the slurry into the feed pipe 17 after the feed pipe 17 moves downward, ensuring the smooth transmission of the slurry.

[0070] Reference Figure 4 and Figure 8 Furthermore, a plurality of scrapers 29 are fixed on the outer wall of the inner mold 26. The function of these scrapers 29 is to scrape the slurry on the retaining ring 27 into the feed groove 28 to ensure that the slurry can be evenly distributed in the mold. A limit ring 8 is provided on the top of the rotating seat 5. The limit ring 8 cooperates with the outer mold 24 to position the outer mold 24 to ensure its stability during the casting process.

[0071] Through this pipe casting equipment, the automatic casting and molding of pipes can be realized, which greatly improves the production efficiency and product quality. At the same time, through reasonable structural design, it can also ensure that the slurry can be evenly filled in the mold to avoid problems such as hollowing.

[0072] Example 2: Reference Fig.11 and Fig.12, improved on the basis of Example 1: In order to position the bottom mold 7, a plurality of positioning structures are also provided on the top of the rotating seat 5. Each positioning structure includes a plurality of limit blocks 45 fixed on the top of the rotating seat 5, and these limit blocks 45 are used to limit the bottom mold 7 to prevent it from moving in the horizontal direction. At the same time, two fixed seats 48 are fixed on the top of the rotating seat 5, and these two fixed seats 48 are located on both sides of the bottom mold 7. A sliding rod 49 is slidably penetrated in each fixed seat 48, and the sliding rod 49 can slide in the fixed seat 48. An L-shaped positioning plate 51 is fixed to the end of the sliding rod 49 that is close to each other, and the L-shaped positioning plate 51 is designed to cooperate with the positioning groove 47 on the bottom mold 7 to fix the bottom mold 7.

[0073] A second spring 50 is fixed to the side of the L-shaped positioning plate 51 away from each other, and one end of the second spring 50 away from the L-shaped positioning plate 51 is fixedly connected to the corresponding fixing seat 48. At the same time, the second spring 50 is sleeved on the outer wall of the corresponding sliding rod 49. This design allows the L-shaped positioning plate 51 to be reset under the elastic force of the second spring 50, ensuring a close fit with the positioning groove 47.

[0074] A first inclined surface 52 is provided on one side of the L-shaped positioning plate 51. When the bottom mold 7 moves, the first inclined surface 52 can cooperate with the bottom mold 7 to push the L-shaped positioning plate 51 to both sides, so that the L-shaped positioning plate 51 can be smoothly inserted into the positioning groove 47. At the same time, a second inclined surface 53 is provided on the bottom of one side of the L-shaped positioning plate 51. When the bottom mold 7 moves upward, the second inclined surface 53 can cooperate with the positioning groove 47 to push the L-shaped positioning plate 51 to move outward, thereby releasing the brake of the L-shaped positioning plate 51 on the bottom mold 7.

[0075] In addition, two insertion holes 46 are provided in the bottom mold 7. The design of these insertion holes 46 facilitates the insertion of the fork plate of the forklift, so that the bottom mold 7 and the pipe fittings are lifted upward by the fork plate. When in use, the bottom mold 7 is first placed on the rotating seat 5, and the rotating seat 5 is pushed toward the middle. When the bottom mold 7 moves, the cooperation between the bottom mold 7 and the first inclined surface 52 pushes the L-shaped positioning plate 51 to both sides until the limit block 45 limits it. At this time, the L-shaped positioning plate 51 is just aligned with the positioning groove 47, and is plugged and matched with the positioning groove 47 under the elastic force of the second spring 50, and the bottom mold 7 is initially fixed. In this way, displacement of the bottom mold 7 during the later pouring of the slurry can be avoided.

[0076] Specifically, the fork plate of the forklift is inserted into the insertion hole 46, and then the bottom mold 7 and the pipe fitting are lifted upward by the fork plate. During the lifting process, the cooperation between the positioning groove 47 and the second inclined surface 53 pushes the L-shaped positioning plate 51 to move outward, thereby releasing the brake of the L-shaped positioning plate 51 on the bottom mold 7. In this way, the bottom mold 7 and the pipe fitting thereon can be smoothly removed, completing the entire casting process.

[0077] A casting method using a pipe casting device comprises the following steps:

[0078] S1. Place the bottom mold 7 on the rotating seat 5, and push the rotating seat 5 toward the middle until the limit block 45 limits the bottom mold 7. When the bottom mold 7 moves, the cooperation between the bottom mold 7 and the first inclined surface 52 pushes the L-shaped positioning plate 51 to both sides until the limit block 45 limits it, and the L-shaped positioning plate 51 is just aligned with the positioning groove 47. The L-shaped positioning plate 51 is plugged and matched with the positioning groove 47 under the elastic force of the second spring 50, and the bottom mold 7 is initially fixed to avoid displacement of the bottom mold 7 during the later pouring of slurry.

[0079] S2, the first motor 4 drives the rotating seat 5 and the outer mold 24 to rotate through the rotating column 3 until they rotate to the bottom of the barrel 10, and the output shaft of the second motor 14 rotates through the driving screw 12, driving the sliding plate 15, the feed pipe 17, the outer mold 24 and the inner mold 26 to move downward until the outer mold 24 is inserted into the limit ring 8, and the bottom end of the inner mold 26 touches the top of the bottom mold 7, completing the cooperation of the bottom mold 7, the outer mold 24 and the inner mold 26, opening the valve on the discharge pipe at the bottom of the barrel 10, and the slurry falls into the feed hopper 16, and the feed hopper 16 and the feed pipe 17 are connected through a bellows. At this time, the slurry falls on the retaining ring 27 through the feed pipe 17 and the multi-way pipe 25, and part of the slurry falls between the outer mold 24 and the inner mold 26 through the feed trough 28 The third motor 19 drives the feed pipe 17 to rotate through the cooperation of the gear 20 and the gear ring 18. The feed pipe 17 drives the first rotating ring 22, the multi-way pipe 25 and the inner mold 26 to rotate through the fixed rod 21. The multi-way pipe 25 evenly sprinkles the slurry on the retaining ring 27, and the scraper 29 scrapes the slurry on the retaining ring 27 into the feed trough 28. In addition, when the first rotating ring 22 and the inner mold 26 rotate, the brake plate 34 abuts against the top of the second rotating ring 23, so the outer mold 24 is in a stationary state, and the inner mold 26 rotates relative to the outer mold 24, so that the slurry can be evenly injected into the cavity between the outer mold 24 and the inner mold 26. In addition, the rotation of the inner mold 26 can evenly fill the slurry in the casting cavity to avoid hollowing.

[0080] S3. After the slurry is poured, the rotating column 3 drives the rotating seat 5 and the sliding plate 15 to rotate synchronously until the circular hole 6 moves to the top of the gas injection pipe 41. The external steam generating device injects steam into the circular hole 6 through the gas injection pipe 41, and the steam is injected into the inner mold 26 through the gas injection hole 43, and the slurry in the pouring cavity is heated through the inclined hole 44 to accelerate the forming and curing of the slurry. When the steam is injected, the inner mold 26 is driven to rotate, so that the steam can evenly heat the slurry in the pouring cavity.

[0081] S4. After the slurry is formed and solidified, the screw 12 drives the sliding plate 15 to move upward, and the sliding plate 15 drives the outer mold 24 and the inner mold 26 to move upward for demoulding, and at the same time drives the inner mold 26 to rotate, so that when the mold is moved upward for demoulding, the pipe fittings are prevented from sticking to the outer wall of the inner mold 26. Then the rotating column 3 continues to drive the rotating seat 5 and the sliding plate 15 to rotate, and the moving frame 35 moves toward the middle under the push and squeeze of the arc bar 30. The brake plate 34 moves from the second rotating ring 23 to the first rotating ring 22, and the thickness of the first rotating ring 22 is less than the thickness of the second rotating ring 23. Therefore, the brake plate 34 does not contact the first rotating ring 22, and the output of the electric push rod 36 The shaft pushes the liquid spraying pipe 37 to move toward the middle until the liquid spraying pipe 37 moves to the bottom of the casting cavity, the second motor 14 continues to drive the sliding plate 15 to move downward through the screw rod 12, the feed pipe 17 drives the first rotating ring 22 and the inner mold 26 to rotate, the first rotating ring 22 drives the outer mold 24 to rotate through the second rotating ring 23, and the mold release agent in the liquid storage tank 40 is sprayed to the inner wall of the outer mold 24 and the outer wall of the inner mold 26 through the nozzle 38 through the water pump 39, and the outer mold 24 and the inner mold 26 rotate synchronously, and the mold release agent can be evenly sprayed on the outer mold 24 and the inner mold 26 through the nozzle 38 to avoid the occurrence of smearing holes, which is convenient for the later casting operation;

[0082] S5. When the cured pipe is placed on the bottom mold 7, the fork plate of the forklift is inserted into the insertion hole 46, and then the bottom mold 7 and the pipe are lifted upward by the fork plate. The cooperation between the positioning groove 47 and the second inclined surface 53 pushes the L-shaped positioning plate 51 to move outward, thereby releasing the brake of the L-shaped positioning plate 51 on the bottom mold 7, so that the bottom mold 7 and the pipe thereon can be moved out.

[0083] However, as is well known to those skilled in the art, the working principles and wiring methods of the third motor 19, the second motor 14, the first motor 4 and the water pump 39 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art may make any optional selections according to their needs or convenience.

[0084] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pipe casting equipment, characterized in that: The invention comprises a base (1), a U-shaped frame (2) is fixed on the top of the base (1), a rotating column (3) is rotatably connected between the top of the base (1) and the inner wall of the top of the U-shaped frame (2), a rotating seat (5) rotatably mounted on the outer wall of the rotating column (3), a plurality of circular holes (6) are provided on the top of the rotating seat (5), a first motor (4) is fixed inside the base (1), and an output shaft of the first motor (4) is fixedly connected to the bottom end of the rotating column (3) via a coupling; It also includes a bottom mold (7) placed on the top of the rotating seat (5), the bottom mold (7) cooperates with the circular hole (6), and a steel mesh (9) is placed on the top of the bottom mold (7); It also includes a plurality of fixed arms (11), each of which is fixed to the outer wall of the rotating column (3); an outer mold (24) and an inner mold (26) are provided below each of the fixed arms (11); the inner mold (26) is located inside the outer mold (24); a casting cavity is formed between the inner mold (26) and the outer mold (24) for casting slurry and solidifying it to form a pipe fitting; the inner mold (26), the outer mold (24) and the bottom mold (7) cooperate; A casting structure is arranged below the fixed arm (11) and is used to drive the outer mold (24) and the inner mold (26) to move downward to cooperate with the bottom mold (7) to complete the casting operation of the pipe fitting; A molding structure, arranged in the base (1), for accelerating the molding and solidification of the slurry in the casting cavity; A coating structure, arranged on the top of the base (1), for automatically coating the inner wall of the outer mold (24) and the outer wall of the inner mold (26) with a release agent to facilitate later demoulding; The casting structure comprises a sliding plate (15) arranged below the fixed arm (11), and one end of the sliding plate (15) slides on the outer wall of the rotating column (3); a screw rod (12) threadedly connected to the sliding plate (15) is rotatably connected to one side of the bottom of the fixed arm (11), and the bottom end of the screw rod (12) is rotatably connected to the top of the rotating seat (5); a second motor (14) is fixed to the top of the fixed arm (11) via a frame, and an output shaft of the second motor (14) is connected to the screw rod (12) via a coupling. The top of the fixed arm (11) is fixedly connected, a guide rod (13) is fixed between the bottom of the fixed arm (11) and the top of the rotating seat (5), and the guide rod (13) slides through the sliding plate (15), the screw rod (12) and the guide rod (13) cooperate to control the lifting of the sliding plate (15), a feed pipe (17) is rotatably penetrated in the sliding plate (15), and a plurality of fixed rods (21) located below the sliding plate (15) are fixed to the outer wall of the feed pipe (17), and the plurality of fixed rods (21) are separated from each other. A first rotating ring (22) is fixed to one end of the mold, a second rotating ring (23) is rotatably sleeved on the outer wall of the first rotating ring (22), and the top of the outer mold (24) is fixed to the bottom of the second rotating ring (23), a multi-way tube (25) is fixed to the bottom end of the feed pipe (17), one end of the multi-way tube (25) away from the retaining ring (27) is fixedly passed through the inner mold (26), and the retaining ring (27) drives the inner mold (26) to rotate through the multi-way tube (25), and a retaining ring (27) is provided in the casting cavity. A retaining ring (27) is rotatably sleeved on the outer wall of the inner mold (26), the retaining ring (27) is fixed on the inner wall of the outer mold (24), and the slurry is limited by the outer mold (24). A plurality of feed grooves (28) for injecting slurry are provided in the retaining ring (27), a gear ring (18) is fixedly sleeved on the outer wall of the feed pipe (17), a third motor (19) is fixed on the bottom of the sliding plate (15), and a gear (20) meshing with the gear ring (18) is fixed on the output shaft of the third motor (19).

2. A pipe casting equipment according to claim 1, characterized in that: The molding structure comprises two partitions (42) fixed in the inner mold (26) and arranged in an upper and lower manner, wherein the partition (42) located at the lower side is provided with an air injection hole (43), and the air injection hole (43) cooperates with the circular hole (6), and an air injection pipe (41) is fixedly passed through the base (1), and the end of the air injection pipe (41) away from the base (1) is connected to an external steam generating device for injecting steam, and the top end of the air injection pipe (41) is connected to one of the circular holes (6), and the air injection pipe (41) injects steam into the inner mold (26) through the circular hole (6) and the air injection hole (43), and the outer wall of the inner mold (26) is provided with a plurality of inclined holes (44) for heating and curing the slurry in the casting cavity by steam.

3. A pipe casting and molding equipment according to claim 2, characterized in that: The coating structure comprises a liquid storage tank (40) fixed on the top of the base (1), a water pump (39) fixed on the top of the liquid storage tank (40), a liquid inlet end of the water pump (39) being connected to the liquid storage tank (40) via a hose, an electric push rod (36) fixed to the inner wall of one side of the U-shaped frame (2), a liquid spraying pipe (37) fixed to the output shaft of the electric push rod (36), the electric push rod (36) driving the liquid spraying pipe (37) to move to make way for the guide rod (13), a liquid outlet end of the water pump (39) being connected to the bottom end of the liquid spraying pipe (37) via a hose, spray heads (38) being fixed on both sides of the liquid spraying pipe (37) for spraying a release agent on the outer wall of the inner mold (26) and the inner wall of the outer mold (24), and two spray heads (38) being located on both sides of the top of the liquid spraying pipe (37).

4. A pipe casting equipment according to claim 3, characterized in that: The smearing structure further comprises an arc-shaped strip (30) fixed to an inner wall of one side of the U-shaped frame (2), and the arc-shaped strip (30) is located above the electric push rod (36); a moving hole (31) is provided in the sliding plate (15), a guide rod (32) is fixed in the moving hole (31), a brake plate (34) is provided on the sliding sleeve of the outer wall of the guide rod (32), and the brake plate (34) slides in the moving hole (31); a first spring (33) is provided on the outer wall of the guide rod (32) and is fixedly connected to the brake plate (34), and the first spring (33) is away from the brake plate (34). One end of the brake plate (34) is fixedly connected to the inner wall of one side of the moving hole (31); a moving frame (35) is fixed on the side of the brake plate (34) away from the rotating column (3), and the moving frame (35) slides on the top of the sliding plate (15); the moving frame (35) cooperates with the arc strip (30) to drive the brake plate (34) to move; a rubber block is fixed to the bottom of the brake plate (34) for increasing the friction between the brake plate (34) and the second rotating ring (23) and braking the second rotating ring (23); a clearance hole is provided in the moving frame (35), and the top end of the guide rod (13) passes through the clearance hole.

5. The pipe casting equipment according to claim 4, characterized in that: The thickness of the first rotating ring (22) is smaller than the thickness of the second rotating ring (23), so as to prevent the brake plate (34) from contacting the first rotating ring (22).

6. The pipe casting equipment according to claim 5, characterized in that: A barrel (10) is fixed on the top of the U-shaped frame (2), a discharge pipe for discharging material is fixed on the bottom end of the barrel (10), and the bottom end of the discharge pipe penetrates the top inner wall of the U-shaped frame (2), and a solenoid valve is provided on the outer wall of the discharge pipe. A feed hopper (16) is fixed on the top of the fixed arm (11) for receiving the slurry discharged from the discharge pipe, and a bellows is fixed on the bottom end of the feed hopper (16), and the bottom end of the bellows extends into the feed pipe (17) and is rotatably connected to the inner wall of the feed pipe (17), so as to smoothly inject the slurry into the feed pipe (17) after the feed pipe (17) moves downward.

7. The pipe casting equipment according to claim 6, characterized in that: A plurality of scrapers (29) are fixed to the outer wall of the inner mold (26) for scraping the slurry on the retaining ring (27) into the feed trough (28). A limiting ring (8) is provided on the top of the rotating seat (5), and the limiting ring (8) cooperates with the outer mold (24) for positioning the outer mold (24).

8. The pipe casting equipment according to claim 7, characterized in that: The top of the rotating seat (5) is provided with a plurality of positioning structures for positioning the bottom mold (7); The positioning structure comprises a plurality of limit blocks (45) fixed on the top of the rotating seat (5), and the limit blocks (45) are used to limit the bottom mold (7). Two fixed seats (48) are fixed on the top of the rotating seat (5), and the two fixed seats (48) are located on both sides of the bottom mold (7). Sliding rods (49) are slidably penetrated in the two fixed seats (48), and L-shaped positioning plates (51) are fixed on the ends of the two sliding rods (49) close to each other. Second springs (50) are fixed on the sides of the two L-shaped positioning plates (51) away from each other, and the ends of the second springs (50) away from the L-shaped positioning plates (51) are fixedly connected to the corresponding fixed seats (48), and the second springs (50) are sleeved on the fixed seats. The outer wall of the corresponding sliding rod (49) is used to drive the L-shaped positioning plate (51) to reset. Positioning grooves (47) are provided on both sides of the bottom mold (7), and the positioning grooves (47) cooperate with the L-shaped positioning plate (51). A first inclined surface (52) is provided on one side of the L-shaped positioning plate (51) for smoothly inserting the L-shaped positioning plate (51) into the positioning groove (47) when the bottom mold (7) moves. A second inclined surface (53) is provided on the bottom of one side of the L-shaped positioning plate (51) for releasing the braking of the L-shaped positioning plate (51) on the bottom mold (7) when the bottom mold (7) moves upward. Two insertion holes (46) are provided in the bottom mold (7) to facilitate the fork plate of a forklift to be inserted into the insertion holes (46) to lift the bottom mold (7) upward.

9. A pipe casting method, using the pipe casting device according to claim 8, characterized in that: The following steps are involved: S1, placing the bottom mold (7) on the rotating seat (5) and pushing it to the limit position, during which the L-shaped positioning plate (51) is pushed outward by the bottom mold (7) until it is plugged into the positioning groove (47) after the limit position, thereby preliminarily fixing the bottom mold (7); S2, the first motor (4) drives the rotating seat (5) and the outer mold (24) to rotate to the bottom of the barrel (10), and the second motor (14) drives the sliding plate (15), the feed pipe (17), the outer mold (24) and the inner mold (26) to descend through the screw rod (12), so that the inner and outer molds (24) are matched with the bottom mold (7); the slurry is evenly injected from the barrel (10) through the feed hopper (16), the feed pipe (17) and the multi-way pipe (25) and falls into the casting cavity, and at the same time, the inner mold (26) rotates to promote uniform filling of the slurry; S3, the rotating seat (5) drives the sliding plate (15) to rotate to above the gas injection pipe (41), and the steam heats the slurry through the gas injection hole (43) and the inclined hole (44) of the inner mold (26), thereby accelerating the molding and curing. The inner mold (26) rotates to ensure uniform steam heating; S4. After the slurry solidifies, the screw rod (12) drives the sliding plate (15) to rise and demould, and at the same time the inner mold (26) rotates to prevent the pipe from sticking; then, the brake plate (34) moves to the first rotating ring (22), the electric push rod (36) pushes the spray pipe (37) to the bottom of the casting cavity, and the water pump (39) sprays the demoulding agent evenly onto the inner wall of the outer mold (24) and the outer wall of the inner mold (26) through the nozzle (38); S5. After the cured pipe fitting is placed on the bottom mold (7), the fork plate of the forklift is inserted into the insertion hole (46) to lift the bottom mold (7), and the L-shaped positioning plate (51) is pushed outward by the second inclined surface (53), thereby releasing the brake on the bottom mold (7) and facilitating the removal of the bottom mold (7) and the pipe fitting.

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