Forming device for building facade stepped plastic water supply and drainage pipeline

Abstract

The invention relates to the technical field of plastic forming processing, in particular to a building facade stepped plastic water supply and drainage pipeline forming device which comprises a machine table, a conveying pipe, a valve fixedly arranged at the other end of the conveying pipe, a lower mold, an upper mold and an ejector rod. The lower die is fixedly arranged on the machine table and communicates with the conveying pipe, the upper die is arranged on the machine table through a driving assembly, a switch assembly matched with the valve is arranged on the upper die, and the ejector rod is connected with the upper die through a transmission assembly. Opening and closing of the valve, opening and closing of the mold and ejection actions are precisely linked, so that the injection amount of raw materials is ensured to be stable and controllable, and the defect of material overflow or material shortage is avoided; and through a staged static and reset mechanism of the ejector rod, complete shaping of the bottom of the workpiece in the forming process is guaranteed, and efficient demolding can be achieved during mold splitting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic forming processing, and particularly relates to a forming device for a stepped plastic water supply and drainage pipeline of an architectural facade. BACKGROUND

[0002] With the continuous updating of modern architectural design concepts, the architectural facade not only embodies architectural aesthetics, but also is endowed with multiple roles of functionality and practicality. In some high-rise residential buildings, commercial complexes and public buildings, in order to realize the orderly drainage of rainwater, air conditioning condensate water and the like, while taking into account the overall coordination and beauty of the architectural appearance, stepped plastic water supply and drainage pipelines are widely used in architectural facades. Such pipelines are usually arranged in layers along the architectural outer wall and are stepped and gradually lowered, which can effectively guide the water flow direction, avoid water accumulation and leakage, and can also be integrated with the lines and colors of the architectural facade, thereby improving the visual level and modernity of the overall building.

[0003] However, the forming devices for producing such stepped plastic pipelines in the prior art generally have some deficiencies. In the mold closing process, the valve opening and closing and the mold action lack effective linkage, and problems such as early or late injection of raw materials often occur, which leads to insufficient filling of the cavity or overflow, thereby affecting the forming quality. In addition, the existing equipment mostly adopts manual auxiliary operation, such as manual control of valve opening and closing, manual demolding and the like, which leads to low production efficiency, high labor intensity, and quality fluctuations caused by human factors, and is difficult to meet the needs of large-scale industrial production. SUMMARY

[0004] The present application aims to provide a forming device for a stepped plastic water supply and drainage pipeline of an architectural facade to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: A forming device for a stepped plastic water supply and drainage pipeline of an architectural facade, comprising a machine table, a conveying pipe and a valve, the conveying pipe is arranged on the machine table through a feeding assembly, when the feeding assembly is running, raw materials can be transported from one end of the conveying pipe to the other end, and the valve is fixedly arranged at the other end of the conveying pipe and used for adjusting the flow and closure of the conveying pipe. Further comprising a lower mold, an upper mold and a material ejecting rod, the lower mold is fixedly arranged on the machine table, and the other end of the conveying pipe is in communication with the inner cavity of the lower mold, the upper mold is arranged on the machine table through a driving assembly, the upper mold is provided with a switch assembly, the switch assembly cooperates with the valve, when the upper mold is driven by the driving assembly to be combined with the lower mold, the switch assembly will open the valve, and the raw materials in the conveying pipe will be injected into the lower mold and the upper mold. The top ejector rod is in sliding fit with the lower die and the top of the top ejector rod is higher than the bottom of the inner cavity of the lower die, the top ejector rod is connected with the upper die through a transmission assembly, during the closing of the upper die and the lower die, the transmission assembly will make the top ejector rod keep static for a period of time, then vertically move downward to keep the top of the top ejector rod flush with the inner cavity of the lower die, and then keep static again. When the upper die and the lower die are opened, the switch assembly will make the valve close, and the transmission assembly will drive the top ejector rod to reset, thereby ejecting the formed workpiece from the lower die.

[0006] The forming device of the building facade ladder type plastic water supply and drainage pipeline as described above: The feeding assembly comprises a material box and a spiral conveying rod, and the material box is fixedly arranged on the machine table. The bottom of the material box is communicated with one end of the conveying pipe, and the spiral conveying rod is rotationally arranged in the conveying pipe.

[0007] The forming device of the building facade ladder type plastic water supply and drainage pipeline as described above: A reduction motor is fixedly arranged on the machine table, and an output end of the reduction motor is coaxially and fixedly connected with one end of the spiral conveying rod. When the spiral conveying rod rotates, the raw material entering the conveying pipe can be conveyed to the direction of the valve.

[0008] The forming device of the building facade ladder type plastic water supply and drainage pipeline as described above: The driving assembly comprises a bracket and a hydraulic cylinder, and the bracket is fixedly arranged on the machine table. The upper die is vertically and slidingly arranged on the bracket, the hydraulic cylinder is fixedly arranged on the top of the bracket, and an output end of the hydraulic cylinder is fixedly connected with the top of the upper die.

[0009] The forming device of the building facade ladder type plastic water supply and drainage pipeline as described above: The switch assembly comprises an L-shaped plate, a first lever and a second lever, and the L-shaped plate is fixedly arranged on the upper die. The first lever and the second lever are fixedly arranged on the L-shaped plate in the vertical direction, and the adjusting rod of the valve is located between the first lever and the second lever.

[0010] The forming device of the building facade ladder type plastic water supply and drainage pipeline as described above: When the upper die moves downward, the L-shaped plate will drive the adjusting rod of the valve to rotate clockwise through the first lever, and the valve is switched from the closed state to the open state. When the upper mold moves upward, the second lever will drive the valve's adjusting rod to rotate counterclockwise.

[0011] The molding device for stepped plastic water supply and drainage pipes on building facades as described above: The transmission assembly includes a threaded rod and a threaded sleeve, with one end of the threaded rod being coaxially and fixedly connected to the bottom of the top material rod; The threaded sleeve is rotatably mounted on the machine base, and the threaded sleeve is threadedly fitted with the threaded rod.

[0012] The molding device for stepped plastic water supply and drainage pipes on building facades as described above: The lower mold has a vertically formed limiting groove inside, and the outer wall of the ejector rod is fixedly provided with a limiting slider, which is located in the limiting groove and slides in fit. The interaction between the limiting slider and the limiting groove ensures that the top material rod can only slide vertically and cannot rotate.

[0013] The molding device for stepped plastic water supply and drainage pipes on building facades as described above: The transmission assembly also includes a rotating rod and a first pulley. The rotating rod is vertically rotatably disposed between the machine base and the support, and the first pulley is coaxially fixedly disposed on the rotating rod. A second pulley is coaxially fixed on the threaded sleeve, and the first pulley and the second pulley are connected by a toothed belt.

[0014] The molding device for stepped plastic water supply and drainage pipes on building facades as described above: A collar is fixedly provided on the upper mold. The collar is slidably sleeved on the outer wall of the rotating rod, and a ball is rolled and fitted on the inner wall of the collar. The outer wall of the rotating rod is provided with a spiral groove along its length. The outer wall of the rotating rod is also provided with a first straight groove and a second straight groove along its length. The top and bottom of the spiral groove are connected to the first straight groove and the second straight groove, respectively, and the ball is also rolled and embedded in the first straight groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The automatic production of the building facade ladder type plastic water supply and drainage pipeline is realized, and the production efficiency and forming precision are improved through the cooperation of the feeding assembly, valve, upper mold, lower mold and ejection rod; the cooperation of the switch assembly and transmission assembly makes the valve opening and closing, mold opening and closing and ejection action precise linkage, ensures the stable and controllable injection amount of raw materials, avoids the defects of material overflow or material shortage; the phased static and reset mechanism of the ejection rod not only ensures the complete shaping of the bottom of the workpiece in the forming process, but also efficiently demolds when the mold is separated, reduces manual intervention and reduces the risk of product damage; the overall device structure is compact, the operation is continuous, is suitable for pipeline forming of complex ladder structure, and can stably output high-precision and high-consistency plastic water supply and drainage pipelines. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the forming device for the building facade ladder type plastic water supply and drainage pipeline.

[0017] Figure 2 It is a sectional view of the conveying pipe in the forming device for the building facade ladder type plastic water supply and drainage pipeline.

[0018] Figure 3 It is Figure 2 the enlarged view of A in the middle.

[0019] Figure 4 It is Figure 2 the enlarged view of B in the middle.

[0020] Figure 5 It is a sectional view of the lower mold, threaded sleeve, No. 2 pulley and toothed belt in the forming device for the building facade ladder type plastic water supply and drainage pipeline.

[0021] Figure 6 It is Figure 5 the enlarged view of C in the middle.

[0022] Figure 7 It is a sectional view of the forming device for the building facade ladder type plastic water supply and drainage pipeline.

[0023] Figure 8 It is Figure 7 the enlarged view of D in the middle.

[0024] Figure 9 It is a split schematic diagram of the rotating rod and sleeve ring of the forming device for the building facade ladder type plastic water supply and drainage pipeline.

[0025] In the figure: 1, machine table; 2, conveying pipe; 3, valve; 4, lower mold; 401, limiting sliding groove; 5, upper mold; 6, ejector rod; 601, limiting sliding block; 7, material box; 8, spiral conveying rod; 9, speed reducer motor; 10, support; 11, hydraulic cylinder; 12, L-shaped plate; 13, No. 1 shifting rod; 14, No. 2 shifting rod; 15, threaded rod; 16, threaded sleeve; 17, rotating rod; 1701, spiral groove; 1702, No. 1 straight groove; 1703, No. 2 straight groove; 18, No. 1 pulley; 19, No. 2 pulley; 20, toothed belt; 21, collar; 22, ball. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all.

[0027] Please refer to Figures 1-9 As an embodiment of the present application, a forming device for building facade ladder type plastic water supply and drainage pipeline comprises a machine table 1, a conveying pipe 2 and a valve 3. The conveying pipe 2 is arranged on the machine table 1 through a feeding assembly. When the feeding assembly operates, the raw material can be conveyed from one end of the conveying pipe 2 to the other end. The valve 3 is fixedly arranged at the other end of the conveying pipe 2 and used for adjusting the flow and closure of the conveying pipe 2. The device further comprises a lower mold 4, an upper mold 5 and an ejector rod 6. The lower mold 4 is fixedly arranged on the machine table 1, and the other end of the conveying pipe 2 is connected with the inner cavity of the lower mold 4. The upper mold 5 is arranged on the machine table 1 through a driving assembly. The upper mold 5 is provided with a switch assembly. The switch assembly cooperates with the valve 3. When the upper mold 5 is combined with the lower mold 4 under the driving of the driving assembly, the switch assembly opens the valve 3, and the raw material in the conveying pipe 2 is injected into the lower mold 4 and the upper mold 5. The ejector rod 6 is in sliding cooperation with the lower mold 4 and the top of the ejector rod 6 is higher than the bottom of the inner cavity of the lower mold 4. The ejector rod 6 is connected with the upper mold 5 through a transmission assembly. During the combination of the upper mold 5 and the lower mold 4, the transmission assembly first keeps the ejector rod 6 static for a period of time, then vertically moves downward to keep the top of the ejector rod 6 flush with the inner cavity of the lower mold 4, and then keeps static again. When the upper mold 5 and the lower mold 4 are separated, the switch assembly closes the valve 3, and the transmission assembly drives the ejector rod 6 to reset, so as to eject the formed workpiece from the lower mold 4.

[0028] In this embodiment, the mold closing and injection stage: the driving assembly drives the upper mold 5 to move downward, the switch assembly first touches and opens the valve 3, and the feeding assembly is started synchronously, the raw material is injected into the mold cavity through the conveying pipe 2; at the same time, the transmission assembly first locks the material ejecting rod 6 to make it stationary, and after a delay of a filling time, the material ejecting rod 6 is released to move downward to be flush with the inner cavity bottom surface of the lower mold 4 and is locked again, so as to ensure that the bottom of the ladder is completely formed and no material ejection hole marks are left; The pressure maintaining and cooling stage: the valve 3 remains open, the upper mold 5 and the lower mold 4 are closed to form a sealed cavity, the raw material is pressure maintained and cooled in the mold until solidification, and the material ejecting rod 6 is always in a stationary state flush with the bottom surface of the cavity to ensure that the outer surface of the product is flat; The mold opening and ejection stage: the driving assembly drives the upper mold 5 to move upward, the switch assembly is separated from the valve 3 and makes it closed to cut off the feeding, and the transmission assembly is unlocked and drives the material ejecting rod 6 to reset upward to vertically eject the solidified ladder pipeline from the lower mold.

[0029] As a further scheme of the present application, the feeding assembly comprises a material box 7 and a spiral conveying rod 8, and the material box 7 is fixedly arranged on the machine table 1; The bottom of the material box 7 is in communication with one end of the conveying pipe 2, and the spiral conveying rod 8 is rotationally arranged in the conveying pipe 2; A speed reduction motor 9 is fixedly arranged on the machine table 1, and the output end of the speed reduction motor 9 is fixedly connected with one end of the spiral conveying rod 8 in a same axis; When the spiral conveying rod 8 rotates, the raw material entering the conveying pipe 2 can be conveyed to the direction of the valve 3.

[0030] In this embodiment, please refer to Figure 1 and Figure 3 , the raw material is pre-stored in the material box 7 fixed on the machine table 1, the bottom of the material box 7 is directly communicated with the first end of the conveying pipe 2, and the raw material continuously falls into the conveying pipe 2 under the action of gravity; After the speed reduction motor 9 is powered on, the spiral conveying rod 8 is driven to rotate at a set speed, the spiral blade continuously pushes the raw material falling into the pipe along the pipe wall to form a stable and metering controllable material column, and the raw material column is conveyed to the direction of the valve 3 located at the end of the conveying pipe 2; When the valve 3 is in a closed state, the raw material is temporarily retained in front of the valve 3, and a certain pre-pressure is formed in the pipe; once the valve 3 is opened by the subsequent mold closing action, the raw material under the pre-pressure rapidly and quantitatively enters the mold cavity to complete the injection preparation, and the whole process can accurately adjust the feeding speed and pressure through the rotation speed of the speed reduction motor 9 to realize mutual cooperation with the subsequent molding.

[0031] As a further scheme of the present application, the driving assembly comprises a bracket 10 and a hydraulic cylinder 11, and the bracket 10 is fixedly arranged on the machine table 1; The upper die 5 is vertically slidably arranged on the support 10, the hydraulic cylinder 11 is fixedly arranged on the top of the support 10, and the output end of the hydraulic cylinder 11 is fixedly connected with the top of the upper die 5.

[0032] In this embodiment, referring to Figure 2 and Figure 5 , the hydraulic cylinder 11 is fixed at the top end of the support 10, and the piston rod thereof is directly connected with the top of the upper die 5; when the hydraulic cylinder 11 is filled with oil, the piston rod drives the upper die 5 to vertically slide downward along the support 10 to complete the die closing, and when the oil is returned, the upper die 5 slides upward to complete the die opening, and the whole lifting action is completed at one time by the extension and retraction of the hydraulic cylinder 11.

[0033] As a further scheme of the present application, the switch assembly comprises an L-shaped plate 12, a first lever 13 and a second lever 14, the L-shaped plate 12 is fixedly arranged on the upper die 5; The first lever 13 and the second lever 14 are fixedly arranged on the L-shaped plate 12 in the vertical direction, and the adjusting rod of the valve 3 is located between the first lever 13 and the second lever 14; When the upper die 5 moves downward, the L-shaped plate 12 drives the adjusting rod of the valve 3 to rotate clockwise through the first lever 13, and the valve 3 is switched from the closed state to the open state; When the upper die 5 moves upward, the second lever 14 drives the adjusting rod of the valve 3 to rotate counterclockwise.

[0034] In this embodiment, referring to Figure 4 , the upper die 5 starts to move downward under the drive of the hydraulic cylinder 11, the L-shaped plate 12 fixed to the side surface thereof moves downward synchronously, the first lever 13 touches the adjusting rod of the valve 3 downward and pushes it to rotate clockwise, the valve 3 is switched from the closed state to the open state, the conveying pipe 2 is connected with the mold cavity, and the raw material starts to be injected; After the molding is completed, the upper die 5 moves upward, the L-shaped plate 12 drives the second lever 14 to move upward; the second lever 14 drives the adjusting rod of the valve 3 to rotate counterclockwise, the valve 3 returns to the closed position, and the raw material flow is cut off, preparing for the next cycle.

[0035] As a further scheme of the present application, the transmission assembly comprises a threaded rod 15 and a threaded sleeve 16, one end of the threaded rod 15 is coaxially fixedly connected with the bottom of the ejector rod 6; The threaded sleeve 16 is rotatably arranged on the machine table 1, and the threaded sleeve 16 is threadedly sleeved with the threaded rod 15; The inside of the lower die 4 is vertically provided with a limiting sliding groove 401, and the outer wall of the ejector rod 6 is fixedly provided with a limiting sliding block 601, the limiting sliding block 601 is located in the limiting sliding groove 401 and is in sliding fit; The limiting sliding block 601 and the limiting sliding groove 401 interact with each other, so that the material pushing rod 6 can only vertically slide and cannot rotate; The transmission assembly further comprises a rotating rod 17 and a first belt wheel 18, the rotating rod 17 is vertically arranged between the machine table 1 and the support 10, and the first belt wheel 18 is coaxially arranged on the rotating rod 17; The second belt wheel 19 is coaxially arranged on the threaded sleeve 16, and the first belt wheel 18 and the second belt wheel 19 are connected through a toothed belt 20; The upper die 5 is fixedly provided with a sleeve ring 21, the sleeve ring 21 is coaxially sleeved on the outer wall of the rotating rod 17, and the inner wall of the sleeve ring 21 is rollingly embedded with a ball 22; The outer wall of the rotating rod 17 is provided with a spiral groove 1701 along the length direction, and the outer wall of the rotating rod 17 is further respectively provided with a first straight groove 1702 and a second straight groove 1703 along the length direction, the top and bottom of the spiral groove 1701 are respectively connected with the first straight groove 1702 and the second straight groove 1703, and the ball 22 is also rollingly embedded in the first straight groove 1702.

[0036] In this embodiment, please refer to Figure 5 , Figure 6 , Figure 8 and Figure 9 , the initial position, the upper die 5 is at the highest position, the ball 22 is located in the first straight groove 1702 at the uppermost end of the rotating rod 17, the threaded rod 15 is rotated to the highest position by the threaded sleeve 16, the top of the material pushing rod 6 is higher than the inner cavity bottom surface of the lower die 4, and the material is waiting to be put in; When the upper die 5 starts to move downward, the sleeve ring 21 slides downward; the ball 22 first linearly rolls in the first straight groove 1702, the rotating rod 17 does not rotate, the threaded sleeve 16 remains stationary, the material pushing rod 6 remains stationary at a high position due to the self-locking of the thread, and it is ensured that the original material is completely formed at the bottom of the ladder when the material is injected; When the ball 22 rolls to the lower end of the first straight groove 1702 and enters the spiral groove 1701, the spiral groove 1701 forces the rotating rod 17 to rotate with the continuous downward movement of the upper die 5, the coaxial first belt wheel 18 drives the second belt wheel 19 and the threaded sleeve 16 to rotate synchronously through the toothed belt 20; since the material pushing rod 6 can only move up and down due to the limitation of the limiting sliding block 601 and the limiting sliding groove 401, the rotation of the threaded sleeve 16 rotates the threaded rod 15 downward, and the material pushing rod 6 vertically moves downward along with it until the top is flush with the inner cavity bottom surface of the lower die 4; at this time, the ball 22 reaches the lowermost end of the spiral groove 1701 and turns into the second straight groove 1703, the rotating rod 17 stops rotating again, and the material pushing rod 6 remains flush until the cooling is completed; When the upper mold 5 moves up, the ball 22 first rolls linearly along the No. 2 straight groove 1703, the rotating rod 17 still does not rotate, and the material pushing rod 6 remains in the flush position and does not move; when the ball 22 returns to the lower end of the spiral groove 1701, the spiral groove 1701 reversely drives the rotating rod 17 to rotate, the threaded sleeve 16 is reversely rotated, the threaded rod 15 is rotated upward, the material pushing rod 6 is synchronously lifted, the solidified stepped pipeline is vertically pushed out from the lower mold 4, and the demolding is completed.

[0037] It will be obvious to a person skilled in the art that, without departing from the spirit or essential characteristics of the application, the present application can be implemented in other specific forms. The present examples are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the specification as such. Any reference signs in the claims should not be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although the present specification describes exemplary embodiments, the application is not limited to the details of each embodiment, but can be implemented in other specific forms without departing from the spirit or essential characteristics of the application. The present specification is described for the purpose of clarity and conciseness, and a person skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A forming device for building facade stepped plastic water supply and drainage pipes, comprising a machine table (1), a conveying pipe (2) and a valve (3), characterized in that, The valve (3) is fixedly arranged at the other end of the conveying pipe (2) and used for adjusting the opening and closing of the conveying pipe (2). Further comprising a lower mold (4), an upper mold (5) and a material ejecting rod (6), the lower mold (4) is fixedly arranged on the machine table (1), and the other end of the conveying pipe (2) is communicated with the inner cavity of the lower mold (4), the upper mold (5) is arranged on the machine table (1) through a driving assembly, the upper mold (5) is provided with a switch assembly, the switch assembly cooperates with the valve (3), when the upper mold (5) is driven by the driving assembly to combine with the lower mold (4), the switch assembly opens the valve (3), and the raw material in the conveying pipe (2) is injected into the lower mold (4) and the upper mold (5). The material ejecting rod (6) is in sliding cooperation with the lower mold (4) and the top of the material ejecting rod (6) is higher than the bottom of the inner cavity of the lower mold (4), the material ejecting rod (6) is connected with the upper mold (5) through a transmission assembly, during the combining process of the upper mold (5) and the lower mold (4), the transmission assembly first keeps the material ejecting rod (6) static for a period of time, then vertically moves downward to keep the top of the material ejecting rod (6) flush with the inner cavity of the lower mold (4) and then keeps static again. When the upper mold (5) and the lower mold (4) are separated, the switch assembly closes the valve (3), and the transmission assembly drives the material ejecting rod (6) to reset, so that the formed workpiece is ejected from the lower mold (4).

2. The forming device of a stepped plastic water supply and drainage pipe for building facade according to claim 1, characterized in that, The feeding assembly comprises a material box (7) and a spiral conveying rod (8), the material box (7) is fixedly arranged on the machine table (1); The bottom of the material box (7) is communicated with one end of the conveying pipe (2), and the spiral conveying rod (8) is rotatably arranged in the conveying pipe (2).

3. The forming device of a stepped plastic water supply and drainage pipe for building facade according to claim 2, characterized in that, A reduction motor (9) is fixedly arranged on the machine table (1), and the output end of the reduction motor (9) is fixedly connected with one end of the spiral conveying rod (8) in a same axis; When the spiral conveying rod (8) rotates, the raw material in the conveying pipe (2) can be conveyed to the valve (3).

4. The forming device of a stepped plastic water supply and drainage pipe for building facade according to claim 1, characterized in that, The driving assembly comprises a support (10) and a hydraulic cylinder (11), the support (10) is fixedly arranged on the machine table (1); The upper mold (5) is vertically slidably arranged on the support (10), the hydraulic cylinder (11) is fixedly arranged on the top of the support (10), and the output end of the hydraulic cylinder (11) is fixedly connected with the top of the upper mold (5).

5. The forming device of a stepped plastic water supply and drainage pipe for building facade according to claim 1, characterized in that, The switch assembly comprises an L-shaped plate (12), a first lever (13) and a second lever (14), the L-shaped plate (12) is fixedly arranged on the upper mold (5). The first dial lever (13) and the second dial lever (14) are fixedly arranged on the L-shaped plate (12) in the vertical direction, and the adjusting rod of the valve (3) is located between the first dial lever (13) and the second dial lever (14).

6. The forming device of a stepped plastic water supply and drainage pipe for building facade according to claim 5, characterized in that, When the upper mold (5) moves downward, the L-shaped plate (12) drives the adjusting rod of the valve (3) to rotate clockwise, and the valve (3) switches from the closed state to the open state. When the upper mold (5) moves upward, the second dial lever (14) drives the adjusting rod of the valve (3) to rotate counterclockwise.

7. The forming device of a stepped plastic water supply and drainage pipe for building facade according to claim 4, characterized in that, The transmission assembly includes a threaded rod (15) and a threaded sleeve (16), one end of the threaded rod (15) is coaxially fixedly connected with the bottom of the ejector rod (6); The threaded sleeve (16) is rotatably arranged on the machine table (1), and the threaded sleeve (16) is threadedly sleeved with the threaded rod (15).

8. The forming device of a stepped plastic water supply and drainage pipe for building facade according to claim 1, characterized in that, The inside of the lower mold (4) is vertically provided with a limiting sliding groove (401), and the outer wall of the ejector rod (6) is fixedly provided with a limiting sliding block (601), the limiting sliding block (601) is located in the limiting sliding groove (401) and is in sliding fit; Under the interaction of the limiting sliding block (601) and the limiting sliding groove (401), the ejector rod (6) can only vertically slide and cannot rotate.

9. The forming device of a stepped plastic water supply and drainage pipe for building facade according to claim 7, characterized in that, The transmission assembly further includes a rotating rod (17) and a first pulley (18), the rotating rod (17) is vertically rotatably arranged between the machine table (1) and the support (10), and the first pulley (18) is coaxially fixedly arranged on the rotating rod (17); The threaded sleeve (16) is coaxially fixedly provided with a second pulley (19), and the first pulley (18) and the second pulley (19) are connected through a toothed belt (20).

10. The forming device of a stepped plastic water supply and sewer pipe for building exterior facade according to claim 9, characterized in that, The upper mold (5) is fixedly provided with a sleeve ring (21), the sleeve ring (21) is coaxially and slidingly sleeved on the outer wall of the rotating rod (17), and the inner wall of the sleeve ring (21) is rollingly embedded with a ball (22); The outer wall of the rotating rod (17) is provided with a spiral groove (1701) along the length direction thereof, and the outer wall of the rotating rod (17) is further provided with a first straight groove (1702) and a second straight groove (1703) along the length direction thereof, the top and bottom of the spiral groove (1701) are respectively connected with the first straight groove (1702) and the second straight groove (1703), and the ball (22) is also rollingly embedded in the first straight groove (1702).

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