Concrete wave wall formwork trolley with auxiliary vibration compacting structure
By designing a concrete waveproof wall formwork trolley with auxiliary vibration compact structure, using automated vibrating rod control and vibration unit, the problem of low construction and casting efficiency of concrete waveproof wall formwork in the existing technology is solved, and efficient concrete vibration compaction is achieved, and project quality is improved.
Patent Information
- Application Number
- CN202510278444.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2025-06-20
AI Technical Summary
In the prior art, the construction and pouring of concrete waveproof wall formwork have problems such as low efficiency and low efficiency of manual vibration and compaction.
A concrete waveproof wall formwork trolley with auxiliary vibration compact structure was designed, using a door-shaped frame, vibration guiding mechanism and vibration unit, and automatic vibration guiding rod control and concrete vibration compaction are realized through servo motor, winding wheel and gravity sensor.
The engineering quality of concrete waveproof walls has been improved, and the traditional manual control tamping method has been replaced, which has enhanced the functionality of the trolley and improved the tamping efficiency and quality.
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Figure CN120174778A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of formwork trolleys for breakwater construction, and more specifically, to a concrete breakwater formwork trolley with an auxiliary vibration compaction structure. Background Technique
[0002] A concrete breakwater is a protective structure used in waters such as coasts, riverbanks, and lakes. It is mainly used to resist the impact of waves, tides, and water currents, and to protect the shoreline, buildings, and infrastructure from erosion and damage. Due to its high strength, good durability, and convenient construction, the concrete breakwater is widely used in water conservancy projects, port projects, and coastal protection projects. At present, most of the construction methods of concrete breakwaters are to use large equipment such as forklifts in cooperation with manual labor, resulting in low efficiency.
[0003] Solving the problems existing in the formwork construction of concrete breakwaters and the pouring of breakwaters with forklifts in cooperation with manual labor: 1. After manually building the formwork and then pouring, the construction period is long and the efficiency is low; 2. After the pouring is completed, it is necessary for manual labor to intervene in time to vibrate and compact the concrete. The disadvantage is that the manual connection and deployment are time-consuming, and the efficiency of manual vibration compaction is low. Summary of the Invention
[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a concrete breakwater formwork trolley with an auxiliary vibration compaction structure to solve the problems in the background technique.
[0005] To achieve the above purpose, the present invention adopts the following technical solutions; A concrete breakwater formwork trolley with an auxiliary vibration compaction structure includes a gantry frame. A breakwater formwork group is arranged at the bottom of the gantry frame, and a vibration guiding mechanism is arranged above the breakwater formwork group at the bottom of the gantry frame; Uniformly distributed traveling wheels are installed at the bottom of the gantry frame, and the traveling wheels are distributed on both sides of the breakwater formwork group.
[0006] The breakwater formwork group includes two side formworks. Uniformly distributed connecting blocks are fixedly installed on the opposite sides of the two side formworks. Uniformly distributed control screws are threadedly connected to the gantry frame, and one end of each control screw is connected to an adjacent connecting block.
[0007] The vibration guiding mechanism includes a servo motor installed on the gantry frame. A winding wheel is fixedly installed on the output shaft of the servo motor. A suspension rope is fixedly installed on the winding wheel, and the other end of the suspension rope is fixedly installed with a vibration guiding rod, and the vibration guiding rod is located between the two side formworks.
[0008] As a further description of the above technical solution: The limiting guide wheels are fixedly installed on the portal frame in a uniformly distributed manner, and the limiting guide wheels are located on one side of adjacent traveling wheels.
[0009] As a further description of the above technical solution: Two electric guide rails are fixedly installed at the bottom of the portal frame. An installation frame is installed between the two electric guide rails. The servo motor is fixedly installed on the installation frame, and the winding wheel is rotatably installed on the installation frame.
[0010] As a further description of the above technical solution: A vertical detection structure and a PLC controller are fixedly installed on the installation frame. The vertical detection structure, the electric guide rail and the servo motor are all electrically connected to the PLC controller.
[0011] As a further description of the above technical solution: The vertical detection structure includes two gravity sensors fixedly installed on the installation frame. Installation blocks are fixedly installed on both of the two gravity sensors. A guide wheel is rotatably installed between the two installation blocks. The lifting rope is wound around the guide wheel. The gravity sensor is electrically connected to the PLC controller.
[0012] As a further description of the above technical solution: The top between the two side templates is open, and a stabilizing rod is clamped between the tops of the two side templates.
[0013] As a further description of the above technical solution: The way the PLC controller controls the servo motor is as follows: When the gravity detection value of the gravity sensor is approximately equal to or equal to the gravity of the vibrating rod hoisted on the lifting rope, it means that the vibrating rod has not entered the concrete, and the servo motor is controlled to work to release the winding wheel through the winding wheel; When the gravity detection value of the gravity sensor is greater than the preset threshold and less than the gravity of the vibrating rod, it means that the vibrating rod approaches the vertical state and enters the concrete, and is affected by the hoisting of the lifting rope, and the servo motor is controlled to work to release the winding wheel in stages through the winding wheel.
[0014] As a further description of the above technical solution: Vibration units are fixedly connected to the opposite sides of the two side templates in a uniformly distributed manner, and the vibration units are distributed in a grid pattern.
[0015] As a further description of the above technical solution: The vibration guide rod is provided with uniformly distributed strip grooves, and a transmission rod is hinged inside the strip grooves. A micro pneumatic push rod is fixedly installed on the vibration guide rod, and a pressure ring is fixedly installed at the output end of the micro pneumatic push rod. The bottom of the pressure ring contacts the transmission rod. An air pump is fixedly installed inside the portal frame, and the air pump is connected to the micro pneumatic push rod through an air duct.
[0016] As a further description of the above technical solution: The transmission rod consists of a lapping rod and a clamping block. The clamping block is slidably installed on the lapping rod. A piston rod is slidably installed inside the lapping rod. One end of the piston rod is fixedly connected to the clamping block. The air pump is connected to the sliding cavity of the piston rod inside the lapping rod through an air duct. The horizontal cross-sectional shape of the lapping rod is arc-shaped.
[0017] Compared with the prior art, the advantages of the present invention are as follows: (1) In this solution, the vibration function is integrated on the trolley, so as to achieve discharging air bubbles from the concrete, filling gaps, etc., making the concrete more compact, improving the engineering quality of the built breakwater, and at the same time replacing the traditional manual control vibration method, enhancing the functionality of the trolley, and improving the vibration efficiency and quality.
[0018] (2) In this solution, the attitude of the vibration rod entering the concrete can be controlled, so as to ensure the vibration quality of the vibration rod for the concrete and improve the manufacturing quality of the built breakwater. Brief Description of the Drawings
[0019] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic connection structural diagram of the portal frame and the breakwater formwork group of the present invention; Figure 3 is a front view structural diagram of the portal frame of the present invention; Figure 4 is a bottom view structural diagram of the portal frame of the present invention; Figure 5 is of the present invention Figure 3 an enlarged structural diagram of part A; Figure 6 is a schematic structural diagram of the vibration guide mechanism of the present invention; Figure 7 is a schematic connection structural diagram of the side formwork and the vibration unit of the present invention; Figure 8 is a front view sectional structural diagram of the vibration guide rod of the present invention; Figure 9 is a schematic structural diagram of the transmission rod of the present invention; Figure 10 is a horizontal cross-sectional structural diagram of the lapping rod of the present invention.
[0020] Description of reference numerals in the figure: 1. Gantry frame; 11. Traveling wheels; 12. Limiting guide wheels; 2. Wave breakwater formwork group; 21. Side formwork; 22. Connecting blocks; 23. Control screws; 24. Vibration units; 3. Vibration guiding mechanism; 31. Servo motor; 32. Reel; 33. Suspension rope; 34. Vibration guiding rod; 341. Transmission rod; 3411. Lapping rod; 3412. Clamping block; 3413. Piston rod; 342. Micro pneumatic push rod; 343. Pressure ring; 35. Electric guide rail; 36. Mounting frame; 4. Vertical detection structure; 41. Gravity sensor; 42. Mounting block; 43. Guide wheel; 5. PLC controller; 6. Air pump. Detailed implementation manners
[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; Please refer to Figures 1 - 10 , in the present invention, a concrete wave breakwater formwork trolley with an auxiliary vibration compaction structure includes a gantry frame 1. A wave breakwater formwork group 2 is arranged at the bottom of the gantry frame 1, and a vibration guiding mechanism 3 is arranged above the wave breakwater formwork group 2 at the bottom of the gantry frame 1; Uniformly distributed traveling wheels 11 are installed at the bottom of the gantry frame 1, and the traveling wheels 11 are distributed on both sides of the wave breakwater formwork group 2; The wave breakwater formwork group 2 includes two side formworks 21. Uniformly distributed connecting blocks 22 are fixedly installed on the opposite sides of the two side formworks 21. Uniformly distributed control screws 23 are threadedly connected to the gantry frame 1, and one end of the control screw 23 is connected to the adjacent connecting block 22; The vibration guiding mechanism 3 includes a servo motor 31 installed on the gantry frame 1. A reel 32 is fixedly installed on the output shaft of the servo motor 31. A suspension rope 33 is fixedly installed on the reel 32, and the other end of the suspension rope 33 is fixedly installed with a vibration guiding rod 34, and the vibration guiding rod 34 is located between the two side formworks 21.
[0022] In the present invention, by controlling the gantry frame 1 to move to the position of the wave breakwater to be constructed, by rotating the control screw 23 and the connecting block 22, the two side formworks 21 are driven to close the mold to form the main shape of the wave breakwater. Then, concrete is filled between the two side formworks 21, and then the servo motor 31 is controlled to be powered on to drive the reel 32 to rotate to complete the winding and unwinding of the suspension rope 33. When the suspension rope 33 is released, the vibration guiding rod 34 descends into the concrete, and then the vibration guiding rod 34 is powered on to work, so as to discharge air bubbles and fill gaps in the concrete, make the concrete more compact, improve the engineering quality of the constructed wave breakwater, and at the same time replace the traditional manual control vibration compaction method, enhance the functionality of the trolley, and improve the vibration compaction efficiency and quality at the same time.
[0023] Please refer to Figure 1 AndFigure 2 , wherein: Restricting guide wheels 12 are fixedly installed on the gantry frame 1 and are evenly distributed, and the restricting guide wheels 12 are located on one side of adjacent traveling wheels 11.
[0024] In the present invention, the restricting guide wheels 12 can cooperate with adjacent traveling wheels 11 to form a right-angle guiding structure, ensuring the stability and reliability of the gantry frame 1 during the walking process.
[0025] Please refer to Figure 3 and Figure 4 , wherein: Two electric guide rails 35 are fixedly installed at the bottom of the gantry frame 1, an installation frame 36 is installed between the two electric guide rails 35, a servo motor 31 is fixedly installed on the installation frame 36, and a winding wheel 32 is rotatably installed on the installation frame 36.
[0026] In the present invention, the installation frame 36 facilitates the installation of the servo motor 31 and the winding wheel 32. At the same time, when the electric guide rails 35 are energized to work, they can drive the winding wheel 32 to move back and forth at the bottom of the gantry frame 1, so that the vibration guide rod 34 can move to a part of the position of the concrete, thereby ensuring the uniformity of the vibration of the concrete.
[0027] Please refer to Figure 3 and Figure 4 , wherein: A vertical detection structure 4 and a PLC controller 5 are fixedly installed on the installation frame 36, and the vertical detection structure 4, the electric guide rails 35 and the servo motor 31 are all electrically connected to the PLC controller 5.
[0028] In the present invention, the PLC controller 5 can control the dropping method and speed of the vibration guide rod 34 according to the detection data of the vertical detection structure 4, with a higher degree of automation and improved vibration efficiency at the same time.
[0029] Please refer to Figures 3 - 5 , wherein: The vertical detection structure 4 includes two gravity sensors 41 fixedly installed on the installation frame 36. Installation blocks 42 are fixedly installed on both of the two gravity sensors 41. A guiding wheel 43 is rotatably installed between the two installation blocks 42. A suspension rope 33 is wound around the guiding wheel 43, and the gravity sensors 41 are electrically connected to the PLC controller 5.
[0030] In the present invention, when the vibration guide rod 34 on the suspension rope 33 hangs naturally, its weight will be transmitted to the guiding wheel 43 through the suspension rope 33, and then detected by the gravity sensors 41. According to the change of the detection data of the gravity sensors 41, the state of the vibration guide rod 34, such as vertical or inclined, can be understood in time, and the dropping method can be adjusted to ensure the attitude of the vibration guide rod 34 entering the concrete and ensure the vibration quality.
[0031] Please refer to Figure 1 and Figure 2, wherein: the top between the two side templates 21 is open, and a stabilizing rod is clamped at the top between the two side templates 21.
[0032] In the present invention, the opening at the top of the two side templates 21 facilitates the pouring of concrete and at the same time gives space for the vibrating rod 34 to enter. The stabilizing rod ensures the stability of the two side templates 21 during mold closing and vibration process, and only increases the number of times the vibrating rod 34 enters the concrete.
[0033] Please refer to Figures 1 - 5 , wherein: the PLC controller 5 controls the servo motor 31 in the following manner: When the gravity detection value of the gravity sensor 41 is approximately equal to or equal to the gravity of the vibrating rod 34 hoisted on the suspension rope 33, it means that the vibrating rod 34 has not entered the concrete. The servo motor 31 is controlled to work to release the winding wheel 32 through the winding wheel 32; When the gravity detection value of the gravity sensor 41 is greater than the preset threshold and less than the gravity of the vibrating rod 34, it means that the vibrating rod 34 is approaching the vertical state and entering the concrete, and is affected by the hoisting of the suspension rope 33. The servo motor 31 is controlled to work to release the winding wheel 32 in stages through the winding wheel 32.
[0034] In the present invention, the gravity sensor 41 is zeroed when affected by the gravity of the mounting block 42 and the guide wheel 43, and then the placement work of the vibration mechanism 3 is controlled according to the detection value of the gravity sensor 41.
[0035] Please refer to Figure 7 , on the opposite sides of the two side templates 21, evenly distributed vibration units 24 are fixedly connected. The vibration units 24 are electromagnetic vibrators, and the vibration units 24 are distributed in a grid pattern. The PLC controller 5 is electrically connected to the vibration units 24; The PLC controller 5 can receive the working state of the electric guide rail 35, and then judge the corresponding position in the vertical direction of the vibrating rod 34 accordingly. During the process of lowering the vibrating rod 34, the vibration units 24 in the corresponding vertical range are controlled by the PLC controller 5 to vibrate to make the concrete in this area active, which facilitates the vibrating rod 34 to sink into the interior of the concrete and reduces the resistance for the vibrating rod 34 to enter. After the vibrating rod 34 enters the target area, the overall vibration units 24 are controlled by the PLC controller 5 to vibrate simultaneously, so as to improve the discharge of air bubbles in the wave breakwater within the pouring range.
[0036] Since the vibration units 24 are distributed in a grid pattern, they are divided into upper and lower vibration ranges. Due to the pressure of the upper concrete on the bottom concrete, the compactness of the bottom concrete is relatively high. Therefore, the vibration units 24 in the lower layer adopt low-frequency vibration, which can avoid the sinking of aggregates and the floating of slurry caused by excessive vibration. The vibration units 24 in the upper layer adopt high-frequency vibration, which can more effectively discharge air bubbles. Moreover, this stratified variable-frequency vibration method can form a smooth discharge path for air bubbles from the lower layer to the upper layer, facilitating the discharge of air bubbles in the concrete.
[0037] Please refer to Figure 1 、 2 Figures 3, 8, 9 and 10. There are uniformly distributed strip grooves on the vibrating rod 34. A transmission rod 341 is hinged inside the strip groove. A micro pneumatic push rod 342 is fixedly installed on the vibrating rod 34. A pressing ring 343 is fixedly installed at the output end of the micro pneumatic push rod 342. The bottom of the pressing ring 343 contacts the transmission rod 341. An air pump 6 is fixedly installed inside the portal frame 1. The air pump 6 is connected to the micro pneumatic push rod 342 through an air duct.
[0038] The transmission rod 341 consists of a lapping rod 3411 and a clamping block 3412. The clamping block 3412 is slidably installed on the lapping rod 3411. A piston rod 3413 is slidably installed inside the lapping rod 3411. One end of the piston rod 3413 is fixedly connected to the clamping block 3412. The air pump 6 is connected to the sliding cavity of the piston rod 3413 inside the lapping rod 3411 through an air duct. The horizontal cross-sectional shape of the lapping rod 3411 is arc-shaped.
[0039] When the vibrating rod 34 enters the target vibration area in the concrete, due to the lowering method of the vibrating rod 34 and the assistance of the vibration unit 24, the vibrating rod 34 is likely to be in an approximately vertical state. And for the construction of the wave breakwater, usually a stable threaded steel skeleton is set inside the formwork before pouring concrete to improve the construction strength and service life of the wave breakwater. Therefore, by opening the solenoid valve between the air pump 6 and the micro pneumatic push rod 342, the micro pneumatic push rod 342 is pushed to press down the pressing ring 343, so that the transmission rod 341 opens from the vibrating rod 34 and gradually approaches the skeleton part. After the opening is completed, the transmission rod 341 initially contacts the steel bars. Then, by opening the solenoid valve on the air duct between the air pump 6 and the lapping rod 3411, positive pressure is used to drive the piston rod 3413 to drive the clamping block 3412 to approach the lapping rod 3411 to clamp and fix the steel bars. During the vibration of the vibrating rod 34, vibration is transmitted through the transmission rod 341, so that the skeleton in this area or the overall skeleton all have the function of vibrating and compacting the concrete, improving the effect of vibration and air discharge. The interface between the steel bars and the concrete is an area where air bubbles are likely to gather. Vibration of the steel bars can reduce the air bubbles at the interface and improve the bonding strength between the steel bars and the concrete.
[0040] The opening of the transfer rod 341 forms a strip-shaped groove on the surface of the vibration guide rod 34 that was originally used to embed the transfer rod 341. During vibration, the air bubbles inside the concrete migrate towards the surface due to density differences. High-frequency vibration (such as 80 - 120 Hz) causes the periodic compression and expansion of the concrete paste, creating local pressure fluctuations in the groove, which further drives the air bubbles to move directionally along the groove. The presence of the groove provides a low-resistance path for the air bubbles, thus accelerating the upward floating speed of the air bubbles in this section and improving the exhaust efficiency. Among them, the expanded state of the overlapping rod 3411 increases its coverage area. The concave surface of the overlapping rod 3411 faces downward, and the gas floating upward due to vibration below is guided by the concave surface towards the vibration guide rod 34, thereby facilitating the collection of the floating gas to form large air bubbles, increasing the buoyancy of the air bubbles, and improving the floating efficiency.
[0041] Secondly, the setting of the vibration guide rod 34 facilitates the centralized vibration and exhaust work of the gas in the concrete in the local area, with higher flexibility in use.
[0042] As described above, it is only the preferred specific embodiment of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, making equivalent replacements or changes, shall be covered by the protection scope of the present invention.
Claims
1. A concrete wave-breaking wall formwork trolley with an auxiliary vibration compaction structure, comprising a door-type frame (1), characterized in that: A wave-breaking wall template group (2) is arranged at the bottom of the door-shaped frame (1), and a vibration guide mechanism (3) located above the wave-breaking wall template group (2) is arranged at the bottom of the door-shaped frame (1); The bottom of the door-shaped frame (1) is provided with evenly distributed running wheels (11), and the running wheels (11) are distributed on both sides of the wave-breaking wall template group (2); The wave-breaking wall template group (2) comprises two side templates (21), and evenly distributed connection blocks (22) are fixedly installed on opposite sides of the two side templates (21); evenly distributed control screws (23) are threadedly connected to the door-shaped frame (1), and one end of the control screw (23) is connected to an adjacent connection block (22); The vibration guide mechanism (3) comprises a servo motor (31) mounted on the door-shaped frame (1); a winding wheel (32) is fixedly mounted on the output shaft of the servo motor (31); a suspension rope (33) is fixedly mounted on the winding wheel (32); a vibration guide rod (34) is fixedly mounted on the other end of the suspension rope (33); and the vibration guide rod (34) is located between the two side templates (21).
2. The concrete wave-breaking wall formwork trolley with auxiliary vibration compaction structure according to claim 1 is characterized in that: The door-shaped frame (1) is fixedly mounted with evenly distributed limiting guide wheels (12), and the limiting guide wheels (12) are located on one side of an adjacent running wheel (11).
3. The concrete wave-breaking wall formwork trolley with auxiliary vibration compaction structure according to claim 1 is characterized in that: Two electric guide rails (35) are fixedly mounted on the bottom of the door-shaped frame (1), a mounting frame (36) is mounted between the two electric guide rails (35), the servo motor (31) is fixedly mounted on the mounting frame (36), and the winding wheel (32) is rotatably mounted on the mounting frame (36).
4. The concrete wave-breaking wall formwork trolley with auxiliary vibration compaction structure according to claim 3 is characterized in that: A vertical detection structure (4) and a PLC controller (5) are fixedly mounted on the mounting frame (36); the vertical detection structure (4), the electric guide rail (35) and the servo motor (31) are all electrically connected to the PLC controller (5).
5. The concrete wave-breaking wall formwork trolley with auxiliary vibration compaction structure according to claim 4 is characterized in that: The vertical detection structure (4) comprises two gravity sensors (41) fixedly mounted on a mounting frame (36), a mounting block (42) fixedly mounted on each of the two gravity sensors (41), a guide wheel (43) rotatably mounted between the two mounting blocks (42), the suspension rope (33) being wound around the guide wheel (43), and the gravity sensor (41) being electrically connected to a PLC controller (5).
6. The concrete wave-breaking wall formwork trolley with auxiliary vibration compaction structure according to claim 1, characterized in that: The top between the two side templates (21) is open, and a stabilizing rod is clamped on the top between the two side templates (21).
7. The concrete wave-breaking wall formwork trolley with auxiliary vibration compaction structure according to claim 5 is characterized in that: The PLC controller (5) controls the servo motor (31) in the following manner: When the gravity detection value of the gravity sensor (41) is equal to the gravity of the vibration guide rod (34) suspended on the suspension rope (33), it means that the vibration guide rod (34) has not entered the concrete, and the servo motor (31) is controlled to work to release the winding wheel (32) through the winding wheel (32); When the gravity detection value of the gravity sensor (41) is greater than a preset threshold value and less than the gravity of the vibration guide rod (34), it indicates that the vibration guide rod (34) is approaching a vertical state and enters the concrete, and is affected by the lifting of the lifting rope (33), and controls the servo motor (31) to work through the winding wheel (32) stage to release the winding wheel (32).
8. The concrete wave-breaking wall formwork trolley with auxiliary vibration compaction structure according to claim 1, characterized in that: The two side templates (21) are both fixedly connected to one side opposite to the other with uniformly distributed vibration units (24), the vibration units (24) being electromagnetic vibrators, the vibration units (24) being distributed in a grid pattern, and the PLC controller (5) being electrically connected to the vibration units (24).
9. The concrete wave-breaking wall formwork trolley with auxiliary vibration compaction structure according to claim 1, characterized in that: The vibration guide rod (34) is provided with evenly distributed strip grooves, the inner side of which is hingedly connected to a transmission rod (341), a micro-pneumatic push rod (342) is fixedly mounted on the vibration guide rod (34), a pressure ring (343) is fixedly mounted on the output end of the micro-pneumatic push rod (342), the bottom of the pressure ring (343) is in contact with the transmission rod (341), and an air pump (6) is fixedly mounted in the door-shaped frame (1), and the air pump (6) is connected to the micro-pneumatic push rod (342) via an air guide tube.
10. The concrete wave-breaking wall formwork trolley with auxiliary vibration compaction structure according to claim 9, characterized in that: The transmission rod (341) comprises a lap rod (3411) and a clamping block (3412); the clamping block (3412) is slidably mounted on the lap rod (3411); a piston rod (3413) is slidably mounted inside the lap rod (3411); one end of the piston rod (3413) is fixedly connected to the clamping block (3412); the air pump (6) is connected to the sliding cavity of the piston rod (3413) inside the lap rod (3411) via an air guide tube; and the horizontal cross-section of the lap rod (3411) is arc-shaped.
Citation Information
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