Low-wear rotary joint for horizontal drum dryers and method of use thereof

Abstract

The present application relates to a kind of low-wear rotary joint for horizontal drum dryer and its use method.The rotary joint for existing drum dryer is easily damaged, for this the present application includes shell, steam pipe and condensate pipe are provided on the shell, steam pipe and condensate pipe are respectively provided with a section of metal hose between steam pipe and matching steam pipe and between condensate pipe and matching condensate pipe, further including three adjustable elastic suspension fixing components, laser emitter and target indicator, each adjustable elastic suspension fixing component includes sequentially connected compression spring hanger and basket bolt, three adjustable elastic suspension fixing components are in the shape of a triangle, its top end is fixed, and its lower end is hung on different parts of shell respectively, laser emitter is arranged on the shell, laser emitter is fixed on horizontal bar, target indicator is fixed below the shell, and the laser emitted by laser emitter is irradiated on the center of target indicator downward.The present application can buffer and reduce the damage of shock, and is suitable for coal slime drying process.

Description

Technical Field

[0001] This invention relates to a low-wear rotary joint for a horizontal drum dryer and its method of use. Background Technology

[0002] Existing large-scale drum dryers use rotary joints to deliver the required steam into the dryer while simultaneously discharging the steam condensate in a timely manner. The rotary joint, while enabling the conversion between dynamic and static pipelines, also achieves sealing of rotating and stationary parts through mechanical seals and compensation devices. See Chinese utility model patent document CN 219103547 U, published on May 30, 2023.

[0003] Existing rotary joints for large drum dryers include a housing and an internal steam shaft assembly. The housing has a steam inlet and a condensate inlet. The steam shaft assembly is a centrally jacketed tube structure with separate steam and condensate channels. The steam inlet and condensate inlet are connected to the corresponding steam and condensate pipes, respectively—see Chinese invention patent document CN103851289B, published on September 30, 2015. During the drying process, the rotary joint housing remains stationary, while the steam shaft assembly rotates continuously. Steam enters the rotary joint housing from the steam inlet and then enters the dryer via the steam channel. Condensate generated during the drying process flows through the condensate channel and exits from the condensate inlet. Existing rotary joints for large drum dryers are prone to damage; after three to five months of use, issues such as worn shaft seals and steam leakage occur, and their service life needs to be extended. Summary of the Invention

[0004] The technical problem to be solved by the present invention is how to overcome the above-mentioned defects of the prior art and provide a low-wear rotary joint for a horizontal drum dryer.

[0005] Through long-term observation and research, the inventors discovered that there are two main factors affecting the service life of rotary joints: 1. When the horizontal drum dryer is working, the drum and the material inside it roll and generate vibration. This vibration is transmitted through the main shaft of the horizontal drum dryer to the rotating parts of the rotary joint, such as the steam shaft assembly. However, the non-rotating parts of the existing rotary joint cannot move, so the harmful vibration cannot be buffered, which is a major cause of the easy damage of the existing rotary joint sealing shaft seal. 2. The existing rotary joint lacks effective support. Its steam pipe and condensate pipe are connected to steel pipes. The condensate in these steel pipes and the steel pipes connected to the condensate pipes aggravates the uneven weight distribution of the rotary joint. When the horizontal drum dryer is working, the pressure between the rotating and non-rotating parts of the rotary joint is uneven, resulting in excessive local wear. This is another major cause of the easy damage to the existing rotary joint's sealing shaft seal.

[0006] Based on the above understanding, the inventors propose the following technical solution: This low-wear rotary joint for a horizontal drum dryer includes a housing and an internal steam shaft assembly. The housing has a steam inlet and a condensate inlet. The steam shaft assembly is a central jacketed tube structure with a steam passage and a condensate passage respectively. The steam inlet and the condensate inlet are respectively connected to a matching steam pipe and a matching condensate pipe. The feature is that a section of flexible metal hose is provided between the steam inlet and the matching steam pipe, and between the condensate inlet and the matching condensate pipe. It also includes three adjustable elastic suspension fixing components, a laser emitter, and a target indicator.

[0007] Each adjustable elastic suspension fixing assembly includes a compression spring hanger and a turnbuckle connected in sequence. The three adjustable elastic suspension fixing assemblies are arranged in a triangular shape, with their top ends fixed and their bottom ends hanging on different parts of the housing. The laser emitter is mounted on the housing, and the target indicator is fixed to the floor or ground below the housing. When the centerline of the cavity inside the housing coincides with the centerline of the internal steam shaft assembly, the laser emitted by the laser emitter shines downward onto the center of the target indicator. Two lugs are fixed at the bottom of the housing, and the two lugs are hinged to a horizontal shaft. A torque balance rod is also connected to the horizontal shaft. The outer end of the torque balance rod is fixed to the matching bracket by a helical spring. When working with a horizontal drum dryer, the torque balance rod provides a balancing torque to the housing in the opposite direction of the drum rotation.

[0008] In summary, the above solutions can be said to eliminate the aforementioned factors affecting the lifespan of rotary joints from two aspects.

[0009] 1. The rotary joint is suspended and fixed using compression springs in three adjustable elastic suspension fixing components. A section of metal hose is added between the steam pipe inlet and the matching steam pipe, and between the condensate pipe inlet and the matching condensate pipe. In addition, a torque balance tie rod connected by a helical spring is added. In this way, all connections around the low-wear rotary joint of this horizontal drum dryer are elastic connections. With this design, the aforementioned elastic connections can effectively buffer the harmful vibrations generated when the drum and the material inside it roll, and reduce their harmful effects.

[0010] 2. Under the guidance of the laser emitter and the target indicator, the changes in gravity and internal clearance of the low-wear rotary joint used in this horizontal drum dryer can be easily detected. Using the turnbuckles in the three adjustable elastic suspension fixing components, the height and posture of the low-wear rotary joint used in the horizontal drum dryer can be easily adjusted to ensure that the force is balanced and that the clearance between the non-rotating parts (such as the housing) and the rotating parts (such as the housing steam shaft assembly) of the rotary joint remains balanced (i.e., the centerline of the cavity inside the housing coincides with the centerline of the steam shaft assembly inside it). This ensures that the wear between the moving and stationary parts of the rotary joint remains balanced and consistent, thus extending its service life as much as possible.

[0011] When the gap between the non-rotating parts of the adapter (such as the housing) and the rotating parts of the rotary adapter (such as the housing shaft assembly) is uneven, it will inevitably cause the laser spot to deviate from the center of the target indicator, so that the staff can discover and adjust it in time.

[0012] As an optimization, the compression spring hanger includes a spring cylinder, a pressure plate, a hook, and a vertical helical spring. The spring cylinder has an open top and a base plate with a central through hole at the bottom. The hook includes a vertical rod and a hook body. The vertical rod passes through the central through hole, and the pressure plate is fixed to the top of the vertical rod. The vertical helical spring is placed inside the spring cylinder and sleeved on the vertical rod. Both ends of the vertical helical spring abut against the pressure plate and the base plate, respectively. The upper end of the turnbuckle is suspended from the hook body. This design is simple in structure and easy to assemble.

[0013] As an optimization, a short rod is provided on the housing, and the laser emitter is fixed on the short rod. A push-button switch is also provided on the laser emitter. This design facilitates assembly and switching.

[0014] As an optimization, a short plate with a through hole is welded onto the bracket. The outer end of the torque balancing rod has an external thread and passes through the through hole in the short plate. A nut is screwed onto the external thread, and a washer is fitted onto the torque balancing rod inside the nut. A helical spring is fitted onto the torque balancing rod between the washer and the short plate, with its two ends abutting against the short plate and the washer, respectively. With this design, the tension applied to the housing by the torque balancing rod can be adjusted by rotating the nut, so that the torque generated by it cancels out the frictional torque experienced by the housing when the drum rotates.

[0015] The method for installing and using the low-wear rotary joint for the horizontal drum dryer described above in this invention includes the following steps: ① Install and use a horizontal drum dryer according to conventional methods; ②. Install the aforementioned low-wear rotary joint for the horizontal drum dryer onto the tail shaft of the horizontal drum dryer using conventional methods. Take three adjustable elastic suspension fixing components and suspend and fix them on the corresponding parts of the housing of the aforementioned low-wear rotary joint for the horizontal drum dryer, and adjust them to a suitable height respectively. In newly installed horizontal drum dryers, the gap between the non-rotating parts (such as the housing) and the rotating parts (such as the housing steam shaft assembly) of the low-wear rotary joint is small, so that the centerline of the cavity inside the housing basically coincides with the centerline of the steam shaft assembly inside it.

[0016] ③. Turn on the laser emitter, take the target indicator, place it on the floor or ground, and make sure that the laser emitted by the laser emitter shines exactly on the center of the target indicator to form a light spot.

[0017] When the light spot falls on the center of the target indicator, it means that the centerline of the cavity inside the housing is basically aligned with the centerline of the steam shaft assembly inside.

[0018] ④. Connect the steam inlet and condensate inlet to the corresponding steam pipe and condensate pipe respectively through the corresponding metal hoses, and then start the horizontal drum dryer in the conventional manner.

[0019] ⑤. After the load of the horizontal drum dryer stabilizes (continuous feeding, continuous discharge, and stable condensate discharge), observe the direction and amount of the light spot offset on the target indicator. Adjust the turnbuckles in the three adjustable elastic suspension fixing components accordingly to bring the light spot on the target indicator back to the center of the target indicator, and fix the target indicator on the matching floor or ground.

[0020] When the horizontal drum dryer starts up, the condensate produced enters and fills the metal hose connected to the condensate drain pipe. This inevitably increases the weight of the low-wear rotary joint of the horizontal drum dryer, disrupting the balance between its weight and the suspension tension of the three adjustable elastic suspension fixing components, requiring the re-establishment of a new balance.

[0021] ⑥. During the operation of the horizontal drum dryer, observe the direction and amount of light spot deviation on the target indicator plate periodically or irregularly. If the amount of light spot deviation on the target indicator plate exceeds a predetermined value (e.g., the distance between the center of the light spot and the center point of the target indicator plate exceeds 5 mm), adjust the turnbuckles in the three adjustable elastic suspension fixing components in time to bring the light spot on the target indicator plate back to the center of the target indicator plate. This design can achieve a new balance with the low-wear rotary joint of the horizontal drum dryer by shortening the length of the turnbuckles and increasing the tension of the three adjustable elastic suspension fixing components. The centerline of the cavity inside the shell and the centerline of the steam shaft assembly inside the shell will then basically coincide again.

[0022] Previously, when used with a horizontal drum dryer, the sealing shaft seal would wear and steam would leak after three to five months of operation. However, after using the low-wear rotary joint and method for horizontal drum dryers described in this invention, the sealing shaft seal did not wear or steam would leak even after 10 months of continuous operation with the horizontal drum dryer, greatly extending the service life of the low-wear rotary joint for horizontal drum dryers.

[0023] The low-wear rotary joint of the horizontal drum dryer of this invention adopts adjustable elastic suspension for fixing, which can buffer and reduce vibration damage. The eccentricity of the outer shell and the shaft assembly axis can be observed by laser, and the adjustable elastic suspension can be adjusted in time to achieve a new balance. It is suitable for the coal slime drying process. Attached Figure Description

[0024] The low-wear rotary joint for the horizontal drum dryer of the present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a three-dimensional structural diagram of the low-wear rotary joint used in this horizontal drum dryer; Figure 2 yes Figure 1 The diagram shows a front view of a low-wear rotary joint for a horizontal drum dryer. Figure 3 yes Figure 1 A partial cross-sectional view of the medium compression spring assembly (one-quarter of the spring cylinder is cut away along a vertical plane perpendicular to the axis of the spring cylinder). In the diagram: 1 is the housing, 2 is the steam inlet, 3 is the condensate inlet, 4 is the metal hose, 5 is the laser emitter, 51 is the push-button switch, 6 is the target indicator, 7 is the compression spring hanger, 71 is the spring cylinder, 72 is the pressure plate, 73 is the hook, 74 is the vertical helical spring, 711 is the base plate, 731 is the vertical rod, 732 is the hook body, 8 is the turnbuckle, 9 is the horizontal shaft, 10 is the torque balance rod, 11 is the helical spring, 12 is the matching bracket, 13 is the short rod, 14 is the short plate, 15 is the nut, and 16 is the washer. Detailed Implementation

[0025] Implementation method one: such as Figure 1-3 As shown, the low-wear rotary joint for this horizontal drum dryer includes a housing 1 and an internal steam shaft assembly (not shown in the figure). The housing 1 is provided with a steam port 2 and a condensate port 3. The steam shaft assembly is a central jacketed tube structure, with a steam passage and a condensate passage respectively. The steam port 2 and the condensate port 3 are respectively connected to the matching steam pipe (not shown in the figure) and the matching condensate pipe (not shown in the figure). The feature is that a section of flexible metal hose 4 is provided between the steam port 2 and the matching steam pipe and between the condensate port 3 and the matching condensate pipe. It also includes three adjustable elastic suspension fixing components, a laser emitter 5, and a target indicator 6.

[0026] Each adjustable elastic suspension fixing assembly includes a compression spring hanger 7 and a turnbuckle 8 connected in sequence. The three adjustable elastic suspension fixing assemblies are arranged in a triangular shape. Their top ends are fixed to the matching fixing frame (not shown in the figure), and their lower ends are respectively hung on different parts of the housing 1. The laser emitter 5 is set on the housing 1. The target indicator 6 is fixed on the floor or ground below the housing 1. When the centerline of the cavity inside the housing 1 coincides with the centerline of the steam shaft assembly inside it, the laser emitted by the laser emitter 5 shines downward on the center of the target indicator 6. Two lugs are fixed at the bottom of the housing 1. The two lugs are hinged to a horizontal shaft 9. A torque balance rod 10 is also connected to the horizontal shaft. The outer end of the torque balance rod 10 is fixed to the matching bracket 12 by a helical spring 11. When working with a horizontal drum dryer, the torque balance rod 10 provides the housing 1 with a balancing torque opposite to the rotation of the drum.

[0027] The compression spring hanger 7 includes a spring cylinder 71, a pressure plate 72, a hook 73, and a vertical helical spring 74. The spring cylinder 71 has an open top and a bottom plate 711 with a central through hole at the bottom. The hook 73 includes a vertical rod 731 and a hook body 732. The vertical rod passes through the central through hole, and the pressure plate 72 is fixed to the top of the vertical rod 731. The vertical helical spring 74 is placed inside the spring cylinder 71 and sleeved on the vertical rod 731. The two ends of the vertical helical spring 74 abut against the pressure plate 72 and the bottom plate 711, respectively. The upper end of the turnbuckle 8 is suspended from the hook body 732.

[0028] The housing 1 is provided with a short rod 13, the laser emitter 5 is fixed on the short rod 13, and the laser emitter 5 is also provided with a push-button switch 51.

[0029] The bracket 12 is welded with a short plate 14 with a through hole. The torque balance rod 10 has an external thread at its outer end and passes through the through hole in the short plate 14. A nut 15 is screwed on the external thread. A washer 16 is also fitted on the torque balance rod inside the nut 15. The helical spring 11 is fitted on the torque balance rod 10 between the washer 16 and the short plate 14, and its two ends abut against the short plate 14 and the washer 16, respectively.

[0030] The installation and use method of the aforementioned low-wear rotary joint for horizontal drum dryers includes the following steps: ① Install and use a horizontal drum dryer according to conventional methods; ②. Install the aforementioned low-wear rotary joint for the horizontal drum dryer onto the tail shaft of the horizontal drum dryer using conventional methods. Take three adjustable elastic suspension fixing components and suspend and fix them on the corresponding parts of the housing 1 of the aforementioned low-wear rotary joint for the horizontal drum dryer, and adjust them to a suitable height respectively. ③. Turn on the laser emitter 5, take the target indicator 6, place it on the set floor or ground, and make the laser emitted by the laser emitter 5 just illuminate the center of the target indicator 6 to form a light spot. Then stick and fix the target indicator 6 on the set floor or ground. ④. Connect the steam inlet 2 and the condensate inlet 3 to the corresponding metal hoses 4, respectively, and then start the horizontal drum dryer using the conventional method. ⑤. After the load of the horizontal drum dryer stabilizes (continuous feeding, continuous discharge, and stable condensate discharge), observe the direction and amount of the light spot offset on the target indicator 6, and adjust the turnbuckles 8 in the three adjustable elastic suspension fixing components accordingly to bring the light spot on the target indicator 6 back to the center of the target indicator 6. ⑥. During the operation of the horizontal drum dryer, observe the direction and amount of the light spot offset on the target indicator plate at regular or irregular intervals. If the amount of the light spot offset on the target indicator plate 6 exceeds the predetermined value (e.g., the distance between the center of the light spot and the center point of the target indicator plate exceeds 5 mm), adjust the turnbuckles 8 in the three adjustable elastic suspension fixing components in time to bring the light spot on the target indicator plate 6 back to the center of the target indicator plate 6.

Claims

1. A low-wear rotary joint for a horizontal drum dryer, comprising a housing and an internal steam shaft assembly, wherein the housing is provided with a steam inlet and a condensate inlet, the steam shaft assembly is a central jacketed tube structure, respectively provided with a steam passage and a condensate passage, the steam inlet and the condensate inlet being connected to a matching steam pipe and a matching condensate pipe, respectively, characterized in that: A section of flexible metal hose is installed between the steam inlet and the steam pipe, and between the condensate inlet and the condensate pipe. The system also includes three adjustable flexible suspension components, a laser emitter, and a target indicator. Each adjustable elastic suspension fixing assembly includes a compression spring hanger and a turnbuckle connected in sequence. The three adjustable elastic suspension fixing assemblies are arranged in a triangular pattern, with their top ends fixed and their lower ends respectively hanging on different parts of the housing. The laser emitter is mounted on the housing, and the target indicator is fixed to the floor or ground below the housing. The laser emitted by the laser emitter shines downwards onto the center of the target indicator. Two lugs are fixed to the bottom of the housing, and the two lugs are hinged to a horizontal shaft. A torque balance rod is also connected to this horizontal shaft, and the outer end of the torque balance rod is connected to a helical spring. The spring is fixed on the mounting bracket. When used with a horizontal drum dryer, the torque balance rod provides a balancing torque to the housing opposite to the rotation direction of the drum. The compression spring hanger includes a spring cylinder, a pressure plate, a hook, and a vertical helical spring. The spring cylinder has an open top and a bottom plate with a central through hole. The hook includes a vertical rod and a hook body. The vertical rod passes through the central through hole, and the pressure plate is fixed to the top of the vertical rod. The vertical helical spring is placed inside the spring cylinder and sleeved on the vertical rod. The two ends of the vertical helical spring abut against the pressure plate and the bottom plate, respectively. The upper end of the turnbuckle is suspended on the hook body. A short plate with a through hole is welded to the mounting bracket. The outer end of the torque balance rod has an external thread and passes through the through hole in the short plate. A nut is screwed onto the external thread. A washer is also sleeved on the torque balance rod inside the nut. The helical spring is sleeved on the torque balance rod between the washer and the short plate, and its two ends abut against the short plate and the washer, respectively.

2. The low-wear rotary joint for a horizontal drum dryer according to claim 1, characterized in that: The housing is provided with a short rod, the laser emitter is fixed on the short rod, and the laser emitter is also provided with a push-button switch.

3. A method for installing and using a low-wear rotary joint for a horizontal drum dryer as described in claim 1 or 2, comprising the following steps: ①. Install and use a horizontal drum dryer; ②. Install the low-wear rotary joint for the horizontal drum dryer as described in claim 1 or 2 on the tail spindle of the horizontal drum dryer, take three adjustable elastic suspension fixing components and suspend and fix them on the corresponding parts of the housing of the low-wear rotary joint for the horizontal drum dryer as described in claim 1 or 2, and adjust them to a suitable height respectively. ③. Turn on the laser emitter, take the target indicator, place it on the designated floor or ground, and ensure that the laser emitted by the laser emitter illuminates the center of the target indicator to form a light spot. Then fix the target indicator to the designated floor or ground. ④. Connect the steam pipe inlet and the condensate pipe inlet to the corresponding steam pipe and condensate pipe respectively through the corresponding metal hoses, and then you can start the horizontal drum dryer; ⑤. After the load of the horizontal drum dryer stabilizes, observe the direction and amount of the light spot offset on the target indicator, and adjust the turnbuckles in the three adjustable elastic suspension fixing components accordingly to bring the light spot on the target indicator back to the center of the target indicator. ⑥. During the operation of the horizontal drum dryer, observe the direction and amount of the light spot deviation on the target indicator at regular or irregular intervals. If the amount of light spot deviation on the target indicator exceeds the predetermined value, adjust the turnbuckles in the three adjustable elastic suspension fixing components in time to bring the light spot on the target indicator back to the center of the target indicator.

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