A spheroidal graphite cast iron pipe die dotting device

Abstract

The application belongs to the technical field of pipe mold dotting, and discloses a pipe mold dotting device for nodular cast iron pipe, which comprises a driving mechanism, a wind pressure driving hammer head fixed to the bottom of the driving mechanism, a speed detection module for a follower wheel arranged on the bottom of the driving mechanism and moving synchronously with the driving mechanism, a dotting module fixed to the bottom of the driving mechanism and located below the wind pressure driving hammer head, and a stopping module fixed to the dotting module; wherein the dotting module comprises an outer cylinder, a spring and a top rod sleeved in the outer cylinder, the spring elastically supports the top rod, and the spring is provided with a fixing ring on the outer periphery. The stopping module is directly used for emergency stop of dotting, when the rotating speed of the pipe mold is uneven or the pipe mold is suddenly stopped, the stopping module can support the top rod by using internal oil pressure, prevent the top rod from further moving downward, and realize emergency stop.

Description

Technical Field

[0001] This invention belongs to the field of pipe mold marking technology, specifically a pipe mold marking device for ductile iron pipes. Background Technology

[0002] The pipe mold for ductile iron pipes refers to the mold used in the centrifugal casting process. It is an important component of the centrifugal casting process. Because the pipe mold is constantly subjected to alternating hot and cold heat conduction during the casting process, the thermal stress of the pipe mold will change, making it susceptible to damage. Therefore, the pipe mold needs to be replaced and maintained after a certain number of uses.

[0003] Currently, the dotting device used for pipe molds utilizes high-pressure airflow to propel a dotting hammer along a spiral trajectory as the mold rotates circumferentially, rapidly creating dense pits on the inner wall of the mold. The uniformity of the pit density directly affects the quality of the repair. When the mold stops rotating or its rotation speed fluctuates significantly, the dotting device must cease continuous dotting to prevent repeated dotting in the same area or elongation of the dotting interval. Dense dotting or repeated dotting in the same area can easily damage the mold. Existing dotting technologies lack an emergency stop mechanism, preventing the dotting drill from stopping promptly and thus increasing the risk of mold damage. Summary of the Invention

[0004] The purpose of this invention is to provide a pipe mold marking device for ductile iron pipes to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pipe mold marking device for ductile iron pipes, comprising a driving mechanism, and further comprising,

[0006] The wind-driven hammer head is fixed to the bottom of the drive mechanism.

[0007] The follower wheel speed measuring module is located at the bottom of the drive mechanism and moves synchronously with the drive mechanism.

[0008] The dotting module is fixed to the bottom of the drive mechanism and located below the wind pressure driven hammer.

[0009] A stop module, which is fixedly connected to the dot module;

[0010] The dotting module includes an outer cylinder, a spring, and a top rod fitted inside the outer cylinder. The spring elastically supports the top rod, and a retaining ring is provided on the outer periphery of the spring.

[0011] The output end of the wind pressure driven hammer is connected to a hammer, and a punch for being impacted by the hammer is installed on the top of the push rod.

[0012] The stopping module includes an outer cylinder II and a piston, an electromagnet, and a spring II sleeved inside it. The electromagnet is located below the piston to attract the piston. The spring II is elastically supported at the bottom of the piston. The piston rod of the piston extends to the outside of the outer cylinder II and is fixedly connected to a support member. One side of the support member extends into the outer cylinder I and is located below the fixing ring. An oil groove is opened on the inner wall of the outer cylinder II. A flow limiter is opened on the piston.

[0013] Preferably, the follower wheel speed measuring module is equipped with a speed sensor for measuring the speed of the roller. When the speed sensor detects that the roller speed value fluctuates beyond a threshold, the electromagnet is demagnetized in a controlled manner.

[0014] Preferably, a hydraulic chamber is provided at the bottom of the top rod, and an impact hammer is interference-fitted inside the hydraulic chamber. The impact hammer is supported upward by the internal hydraulic oil. A buffer is provided at the bottom of the inner cavity of the outer cylinder. The hydraulic oil in the hydraulic chamber can flow to the buffer through the oil guide pipe, thereby allowing the impact hammer to move freely upward.

[0015] Preferably, the buffer includes a bottom groove.

[0016] The valve core is fitted into the inner cavity of the bottom groove.

[0017] An elastic element, located at the bottom of the inner cavity of the bottom groove, is used to support the valve core.

[0018] The oil-absorbing cavity is located on the periphery of the bottom groove.

[0019] The oil passage, located on the outer cylinder, connects to the oil guide pipe.

[0020] An oil hole is located on the valve core and is used to connect the oil passage and the oil receiving chamber.

[0021] Preferably, a limiting ring is also provided on the inner wall of the bottom groove to limit the final downward formation of the valve core.

[0022] Preferably, the top of the oil-absorbing cavity has an air hole that communicates with the external environment.

[0023] Preferably, a groove is formed on the upper part of the outer cylinder in the vertical direction, and the support member extends through the groove into the interior of the outer cylinder.

[0024] The support member can slide vertically along the slide groove.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. This invention does not adopt the traditional integrated working structure of wind pressure driven hammer head and dotting hammer head. Instead, it separates the two, allowing the wind pressure driven hammer head to provide impact power to strike the dotting module, causing the dotting module to do dotting. This is equivalent to changing the traditional dotting method that only uses a hammer to dotting by using a hammer and a chisel together. This simplifies the structure of the wind pressure driven hammer head and makes it easy to change the dotting module according to different dotting requirements. In addition, a stop module is set up for emergency stopping of dotting. When the rotation speed of the tube mold is uneven or the tube mold rotation stops suddenly, the stop module can use internal hydraulic pressure to support the push rod, preventing it from going down a large stroke and achieving an emergency stop.

[0027] 2. By setting the hydraulic chamber above the striking hammer, when the striking hammer contacts the inner wall of the tube mold, the large pressure exerted by the piston on the hydraulic oil below causes the valve core to descend and open the oil passage and the receiving chamber. After the striking hammer contacts the tube mold, it will press the hydraulic oil inside the hydraulic chamber into the receiving chamber, thereby allowing the striking hammer to retract upwards and preventing hard contact between it and the tube wall from causing repeated striking or damage. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the dotting device of the present invention assembled inside the tube mold;

[0029] Figure 2 For the present invention Figure 1 Enlarged schematic diagram of part A;

[0030] Figure 3 This is a schematic diagram of the follower wheel speed measuring module, wind pressure driven hammer head, and dotting module of the present invention relative to the inner wall of the tube mold;

[0031] Figure 4 This is a schematic internal cross-sectional view of the dotting module and the stop module of the present invention;

[0032] Figure 5 For the present invention Figure 4 Enlarged diagram of part B;

[0033] Figure 6 This is a schematic diagram of the oil-filled cavity structure of the present invention.

[0034] In the diagram: 100, Drive mechanism; 200, Pneumatically driven hammer; 201, Hammer; 300, Dotting module; 301, Outer cylinder one; 3011, Slide groove; 302, Spring one; 303, Push rod; 304, Dotting hammer; 305, Hydraulic chamber; 306, Fixing ring; 307, Punch; 400, Follower wheel speed measuring module; 401, Speed ​​sensor; 500, Stop module; 501, Outer cylinder two; 502, Piston; 503, Oil groove; 504, Electromagnet; 505, Spring two; 5061, Valve core; 5062, Limiting ring; 5063, Elastic element; 5064, Oil passage; 5065, Oil hole; 5066, Bottom groove; 507, Support component; 508, Oil receiving chamber; 5081, Air hole; 509, Flow limiter; 600, Oil guide pipe. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] like Figures 1 to 6 As shown, this embodiment of the invention provides a pipe mold marking device for ductile iron pipes, including a drive mechanism 100, and further comprising:

[0037] The wind pressure drives the hammer head 200, which is fixed to the bottom of the drive mechanism 100.

[0038] The follower wheel speed measuring module 400 is located at the bottom of the drive mechanism 100 and moves synchronously with the drive mechanism 100.

[0039] The dotting module 300 is fixed to the bottom of the drive mechanism 100 and located below the wind pressure driven hammer head 200.

[0040] The stop module 500 is fixedly connected to the dot module 300;

[0041] The dotting module 300 includes an outer cylinder 301, a spring 302 and a push rod 303 sleeved inside it. The spring 302 elastically supports the push rod 303, and a retaining ring 306 is provided on the outer periphery of the spring 302.

[0042] The output end of the wind pressure driven hammer head 200 is connected to a hammer 201, and a punch 307 for being impacted by the hammer 201 is installed on the top of the push rod 303.

[0043] The stop module 500 includes an outer cylinder 501 and a piston 502, an electromagnet 504, and a spring 505 sleeved inside it. The electromagnet 504 is located below the piston 502 to attract the piston 502. The spring 505 is elastically supported at the bottom of the piston 502. The piston rod of the piston 502 extends to the outside of the outer cylinder 501 and is fixedly connected to a support member 507. One side of the support member 507 extends into the outer cylinder 301 and is located below the fixing ring 306. An oil groove 503 is opened on the inner wall of the outer cylinder 501. A flow limiter 509 is opened on the piston 502.

[0044] like Figure 1-4 As shown, the magnetic attraction of the electromagnet 504 pulls the piston 502 downwards, placing it at its lowest position within the inner cavity of the outer cylinder 501. Hydraulic oil is present both above and below the piston 502, and the spring 505 is compressed by the piston. When an emergency stop is required for the marking device, the electromagnet 504 is demagnetized. The piston 502, now demagnetized, moves upwards within the outer cylinder 501 under the elastic force of the spring 505. When the bottom of the piston 502 surpasses the bottom height of the oil groove 503, the hydraulic oil above the piston 502 flows rapidly downwards through the oil groove 503. The oil groove 503 is not the only implementation method; a one-way valve connected to an external oil pipe communicating with the upper and lower cavities of the piston 502 can also be used to achieve rapid downward flow of hydraulic oil. When the push rod 303 impacts downwards, it drives the fixed ring 306 downwards synchronously. The fixed ring 306 is blocked by the raised support member 507, which is pressed downwards. However, due to the presence of hydraulic oil below the piston 502 and the flow restriction of the hydraulic oil passing upwards in the flow limiter 509, a large amount of hydraulic oil remains at the bottom of the piston 502. This remaining hydraulic oil provides support for the piston 502 and the support member 507, and slowly releases the impact pressure through the flow limiter 509. This can support the push rod 303 and prevent the striking hammer 304 from striking downwards at a faster speed. The pressure inside the wind-driven hammer head 200 can be released through the pressure relief valve on it.

[0045] Among them, the flow limiter 509 can be an oil hole with a small diameter or a one-way valve core. This one-way valve core allows hydraulic oil to pass freely downwards, while the pressure is greater and the flow is limited when it passes upwards.

[0046] The follower wheel speed measuring module 400 is equipped with a speed sensor 401 for measuring the speed of the roller. When the speed sensor 401 detects that the roller speed value fluctuates beyond a threshold, the electromagnet 504 is demagnetized in a controlled manner.

[0047] like Figure 3As shown, the wheel edge of the follower wheel speed measuring module 400 always fits against the inner wall of the tube mold. During the marking process, the tube mold is mounted on the traction wheel and rotates at a constant speed. Therefore, the follower wheel speed measuring module 400 rotates synchronously and at a constant speed with the tube mold. When the tube mold's rotational speed fluctuates, the speed sensor 401 can promptly capture the current speed and transmit it to the controller. The control unit determines whether the speed fluctuation exceeds a threshold. If the speed exceeds the threshold, the controller disconnects the power supply to the electromagnet 504, demagnetizing it. Consequently, the piston 502 is immediately pushed upwards by the spring force of spring 505.

[0048] The bottom of the push rod 303 is provided with a hydraulic chamber 305, and the inner cavity of the hydraulic chamber 305 is interference-fitted with a striking hammer 304. The striking hammer 304 is supported upward by the internal hydraulic oil. The bottom of the inner cavity of the outer cylinder 501 is provided with a buffer. The hydraulic oil in the hydraulic chamber 305 can flow to the buffer through the oil guide pipe 600, thereby allowing the striking hammer 304 to move freely upward.

[0049] like Figure 4 As shown, under normal marking conditions, the hydraulic chamber 305 is filled with hydraulic oil, which supports the marking hammer 304, allowing it to perform marking work normally. The marking hammer 304 does not retract inwards during marking. When the rotational speed of the tube mold fluctuates, the oil passage between the buffer and the hydraulic chamber 305 is opened. When the marking hammer 304 strikes the tube wall again, the reaction force causes it to rise and pushes the hydraulic oil in the hydraulic chamber 305 towards the buffer. Therefore, the marking hammer 304 retracts to avoid damaging the tube wall.

[0050] The buffer includes a bottom groove 5066.

[0051] Valve core 5061, which is fitted into the inner cavity of bottom groove 5066.

[0052] The elastic element 5063 is disposed at the bottom of the inner cavity of the bottom groove 5066 to support the valve core 5061.

[0053] The oil receiving cavity 508 is located on the periphery of the bottom groove 5066.

[0054] Oil passage 5064 is located on outer cylinder 2 501 and is used to connect to the oil guide pipe 600 externally.

[0055] Oil hole 5065 is provided on valve core 5061 to connect oil passage 5064 and oil receiving chamber 508.

[0056] like Figure 4 and 5As shown, the hydraulic oil in the cavity below piston 502, after being subjected to downward pressure from piston 502, cannot be completely discharged upward from the flow limiter 509 in time, thus creating significant pressure downward. This forces valve core 5061 to overcome the elastic support of elastic element 5063 and descend, allowing oil passage 5064 to gradually overlap with oil hole 5065, further increasing the overlap area and opening the hydraulic oil delivery channel. During the continuous downward movement of piston 502, push rod 303 also pushes hammer 304 downward. When the initial distance between the bottom hammer head of hammer 304 and the pipe wall is too close, causing stop module 500 to fail to stop its downward trend in time, the hammer 304 collides with the pipe wall, and the resulting pressure compresses hydraulic chamber 305, causing hydraulic oil to flow into receiving chamber 508. This causes hammer 304 to retract inward, preventing it from creating a dent on the pipe wall due to rigid support.

[0057] The bottom groove 5066 is further provided with a limiting ring 5062 on its inner wall to limit the final downward formation of the valve core 5061.

[0058] like Figure 5 As shown, the limiting ring 5062 is located below the valve core 5061 to limit its downward movement. When the limiting ring 5062 abuts against the valve core 5061, the oil hole 5065 can completely overlap with the oil passage 5064, making the passage of hydraulic oil inside the hydraulic delivery chamber 305 completely open. Since the oil passage 5064 completely penetrates the bottom groove 5066, the direction of hydraulic oil delivery can be along the oil passage 5064 to the oil hole 5065, then to the oil receiving chamber 508. After the hydraulic oil in the hydraulic chamber 305 is discharged, its internal space can be compressed, so the striking hammer 304 can move upward.

[0059] The top of the oil-absorbing cavity 508 is provided with an air hole 5081 that communicates with the external environment.

[0060] like Figure 5 As shown, when hydraulic oil is injected from hydraulic chamber 305 into oil receiving chamber 508, it occupies the internal cavity space of oil receiving chamber 508. The air hole 5081 is provided to discharge the air in it to the external environment, so as to avoid the difficulty of hydraulic oil delivery caused by air compression, which would result in the hammer 304 not retracting in time when encountering obstacles.

[0061] The outer cylinder 301 has a vertically oriented groove 3011, and the support member 507 extends through the groove 3011 into the interior of the outer cylinder 301.

[0062] The support member 507 can slide vertically along the slide groove 3011.

[0063] The support member 507 is a ring-shaped part inside the outer cylinder 301 that fits with the inner wall of the outer cylinder 301. The spring 302 and the push rod 303 pass through it. When the fixing ring 306 moves downward with the push rod 303, it can abut against the support member 507. In the initial normal striking state, the height of the support member 507 is not raised. Therefore, the displacement of the push rod 303 when striking downward is insufficient to contact the support member 507 located below. When braking is required, the support member 507 is raised upward, and the fixing ring 306 can abut against the support member 507 downward and be supported and limited by the support member 507.

[0064] Working principle and usage process:

[0065] The follower wheel speed measuring module 400 rotates synchronously with the pipe mold against the pipe wall. The speed sensor 401 monitors the rotation speed of the pipe mold by tracking the rotation speed of the follower wheel speed measuring module 400 and transmits the speed value to the controller. After receiving the speed data, the controller compares it with a fluctuation threshold. When the speed fluctuation value exceeds the preset fluctuation value, the controller controls the electromagnet 504 to demagnetize. After the piston 502 loses its magnetic attraction, it moves upward in the inner cavity of the outer cylinder 501 under the elastic force of the second spring 505. During this process, the hydraulic oil above the piston 502 flows rapidly to the bottom of the piston 502. When the push rod 303 is impacted by the wind pressure-driven hammer head 200, it moves downward. The synchronously moving fixed ring 306 is blocked by the raised support member 507. The support member 507 is pressed downward. However, due to the presence of hydraulic oil below the piston 502 and the flow restriction of the hydraulic oil passing upward in the flow limiter 509, a large amount of hydraulic oil is retained at the bottom of the piston 502. This retained hydraulic oil provides support for the piston 502 and the support member 507, and slowly releases the impact pressure through the flow limiter 509. This can support the push rod 303 and prevent the hammer 304 from striking downward at a faster speed.

[0066] When the hydraulic oil in the cavity below the piston 502 is subjected to downward pressure from the piston 502, it will exert greater pressure on the lower part, forcing the valve core 5061 to overcome the elastic force of the elastic element 5063 and move downward. As a result, the oil passage 5064 and the oil hole 5065 coincide, and the hydraulic oil delivery channel is opened. When the hammer 304 collides with the pipe wall, the support it receives causes the hammer 304 to compress the space of the hydraulic chamber 305, causing the hydraulic oil in it to flow into the receiving chamber 508. This causes the hammer 304 to retract inward, changing the original hard contact to prevent it from chiseling a pit in the pipe wall.

[0067] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pipe mold marking device for ductile iron pipes, comprising a drive mechanism (100), characterized in that: It also includes, A wind-driven hammerhead (200) is fixedly attached to the bottom of the drive mechanism (100). The follower wheel speed measuring module (400) is located at the bottom of the drive mechanism (100) and moves synchronously with the drive mechanism (100). The dotting module (300) is fixed to the bottom of the drive mechanism (100) and located below the wind pressure driven hammer (200). A stop module (500) is fixedly connected to the dotting module (300); The dotting module (300) includes an outer cylinder (301), a spring (302) and a top rod (303) sleeved inside it. The spring (302) elastically supports the top rod (303), and a fixing ring (306) is provided on the outer periphery of the spring (302). The output end of the wind pressure driven hammer (200) is connected to a hammer (201), and a punch (307) for being impacted by the hammer (201) is installed on the top of the push rod (303). The stop module (500) includes an outer cylinder (501) and a piston (502), an electromagnet (504), and a spring (505) sleeved inside it. The electromagnet (504) is located below the piston (502) to attract the piston (502). The spring (505) is elastically supported at the bottom of the piston (502). The piston rod of the piston (502) extends to the outside of the outer cylinder (501) and is fixedly connected to a support member (507). One side of the support member (507) extends into the outer cylinder (301) and is located below the fixing ring (306). An oil groove (503) is opened on the inner wall of the outer cylinder (501). A flow limiter (509) is opened on the piston (502).

2. The pipe mold marking device for ductile iron pipes according to claim 1, characterized in that: The follower wheel speed measuring module (400) is equipped with a speed sensor (401) for measuring the speed of the roller. When the speed sensor (401) detects that the roller speed value fluctuates beyond a threshold, the electromagnet (504) is demagnetized in a controlled manner.

3. The pipe mold marking device for ductile iron pipes according to claim 1, characterized in that: The bottom of the top rod (303) is provided with a hydraulic chamber (305), and the inner cavity of the hydraulic chamber (305) is interference-fitted with a striking hammer (304). The striking hammer (304) is supported upward by the internal hydraulic oil. The bottom of the inner cavity of the outer cylinder (501) is provided with a buffer. The hydraulic oil in the hydraulic chamber (305) can flow to the buffer through the oil guide pipe (600), thereby allowing the striking hammer (304) to move freely upward.

4. The pipe mold marking device for ductile iron pipes according to claim 3, characterized in that: The buffer includes a bottom groove (5066), The valve core (5061) is fitted into the inner cavity of the bottom groove (5066). An elastic element (5063) is disposed at the bottom of the inner cavity of the bottom groove (5066) to support the valve core (5061). The oil receiving cavity (508) is located on the periphery of the bottom groove (5066). Oil passage (5064), which is located on outer cylinder two (501) and is used to connect to the oil guide pipe (600) externally. An oil hole (5065) is provided on the valve core (5061) to connect the oil passage (5064) and the oil receiving chamber (508).

5. The pipe mold marking device for ductile iron pipes according to claim 4, characterized in that: A limiting ring (5062) is also provided on the inner wall of the bottom groove (5066) to limit the final downward formation of the valve core (5061).

6. The pipe mold marking device for ductile iron pipe according to claim 4, characterized in that: The top of the oil-absorbing cavity (508) is provided with an air hole (5081) that communicates with the external environment.

7. The pipe mold marking device for ductile iron pipes according to claim 1, characterized in that: The outer cylinder (301) has a vertical groove (3011) on its upper part, and the support member (507) extends through the groove (3011) into the interior of the outer cylinder (301). The support (507) can slide vertically along the groove (3011).

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