An equal-interval punching device for subgrade drainage pipe

Abstract

The application relates to the technical field of drainage pipe punching and discloses an equal-interval punching equipment for a roadbed drainage pipe, which comprises a table body, the inside of a warehouse body on the table body is provided with a table plate, the front section of the table plate is provided with a conveying frame, and the conveying frame is provided with a conveying belt; the middle section of the table plate is fixedly provided with a portal frame and a residence frame, the portal frame is fixedly provided with a motion decoupling mechanism, the output side of the decoupling mechanism is provided with a bearing frame, the bearing frame is rotatably provided with a T-shaped plate, and the side of the T-shaped plate is provided with a power cutter; the rear end of the table plate is provided with a notch, and the bottom of the notch is provided with a pipe outlet cylinder. The motion decoupling mechanism is used for realizing stable pressure maintaining of a punching terminal, and the quality of a hole wall is obviously improved; the adjustable-inclination T-shaped plate meets the requirement of inclined hole machining and expands the application range; in cooperation with unpowered gravity conveying and positioning discharging, high-precision equal-interval continuous punching is realized, so that the quality of the hole wall and the application range of the whole equipment are obviously improved.

Description

Technical Field

[0001] This invention relates to the field of drainage pipe drilling technology, and specifically discloses a roadbed drainage pipe equal-spacing drilling device. Background Technology

[0002] Roadbed drainage pipes are crucial facilities in roadbed engineering projects such as highways and railways, used to drain groundwater seepage and maintain roadbed stability. To guide moisture from the surrounding soil into the pipe and discharge it longitudinally, several seepage holes must be made in the pipe wall. According to relevant drainage design specifications, the seepage holes must be evenly arranged along the pipe body according to predetermined diameter, spacing, and arrangement to ensure balanced drainage capacity along the entire length, thereby preventing localized water accumulation that could lead to roadbed softening. Therefore, the processing quality and spacing accuracy of the seepage holes directly affect the performance of the drainage pipe and the long-term stability of the roadbed.

[0003] The invention disclosed in publication number CN117226928A is an automated adjustable drilling device for roadbed drainage pipes. This prior art relies on a pressure cylinder, a punching cylinder, a chain drive box, a drilling motor, and a drill bit for drilling. During operation, the pressure cylinder pushes the drill bit downwards to complete one hole. After drilling, the drill bit returns to its original position, and then the drive motor rotates the anti-slip traction wheel to complete multiple rows of holes. The switching and timing control between the drilling action and the pipe feed in the aforementioned prior art are generally achieved through a programmable logic controller (PLC) in conjunction with a position sensor.

[0004] Based on the aforementioned existing technologies, the following scheme is commonly used in this field for drilling equally spaced holes in drainage pipes: the drilling device mainly consists of a vertically mounted air cylinder or hydraulic cylinder, a drill bit connected to the lower end of the piston rod, and an independent pipe delivery mechanism. However, in practical applications, this scheme has the following two main drawbacks. Firstly, the drill bit driven by the vertical air cylinder is difficult to effectively maintain pressure and stop after penetrating the pipe wall; since the air cylinder relies on gas compression for drive, the piston is difficult to precisely lock at the end of the stroke during braking, and the gas itself is compressible, causing the drill bit to start retracting almost immediately after penetrating the pipe wall, lacking a sufficient and controllable dwell time; at the same time, the dwell time control of the air cylinder is rough, greatly affected by air pressure fluctuations, the end movement speed is relatively fast and difficult to transition smoothly, and the impact is obvious; the above factors together cause the drill bit to fail to form a stable extrusion and shaping around the hole wall, and the pipe wall material is prone to burrs after rebound, seriously affecting the finished quality of the seepage hole. On the other hand, since both the cylinder and the drill bit are vertically fixed, the feed direction of the drill bit is always perpendicular to the surface of the pipe, and the drilling angle cannot be adjusted according to the actual drainage needs. Some engineering conditions require the seepage holes to be opened at a certain angle to enhance the water collection effect and prevent external mud and sand from entering the pipe vertically along the hole opening and causing blockage.

[0005] In summary, existing technologies struggle to maintain effective pressure and hold the drill bit after it penetrates the pipe wall during drilling, resulting in severe hole wall rebound, burrs, and poor hole roundness. Furthermore, the fixed feed direction of the drill bit perpendicular to the pipe surface prevents adjustment of the drilling angle, making it difficult to meet the processing requirements of inclined seepage holes and limiting the equipment's adaptability to different drainage conditions. Summary of the Invention

[0006] To address the current limitations of cylinder-driven drill bit drilling equipment for roadbed drainage pipes, which makes it difficult to maintain pressure and hold the drill bit after penetrating the pipe wall, resulting in hole wall rebound, burrs, and poor hole roundness, and because the drill bit feed direction is fixed perpendicular to the pipe surface and the drilling angle cannot be adjusted, making it difficult to meet the processing requirements of inclined seepage holes, the equipment's adaptability to different drainage conditions is limited, leading to poor hole wall quality and a narrow range of applicability. This invention provides an equal-spacing drilling device for roadbed drainage pipes.

[0007] To address the above problems, the present invention provides the following technical solution: A roadbed drainage pipe equal-spacing drilling device includes a platform, a chamber fixedly mounted on the platform, a platform plate tightly connected to the platform inside the chamber, a conveyor frame fixedly mounted at the front of the platform plate, and a conveyor belt for conveying the roadbed drainage pipe body rotatably mounted on the conveyor frame; a gantry frame and a retaining frame fixedly mounted in the middle of the platform plate, the retaining frame for stabilizing and retaining the roadbed drainage pipe body, a motion decoupling mechanism fixedly mounted on the gantry frame, the motion decoupling mechanism for decoupling the continuous horizontal reciprocating linear motion on the input side into a vertical reciprocating intermittent motion on the output side with predetermined pause periods at both ends of the stroke, a bearing frame fixedly mounted on the output side of the decoupling mechanism, a T-shaped plate for adjusting the tilt angle rotatably mounted inside the bearing frame, and multiple equally spaced power cutters for drilling mounted on the side of the T-shaped plate; a slot for the roadbed drainage pipe body to pass through is fixedly opened at the rear end of the platform plate, and a pipe outlet is fixedly mounted at the bottom of the slot.

[0008] Preferably, the conveyor frame has two components, each with a roller shaft rotatably mounted inside. A support is fixedly mounted on the platform, and a motor is fixedly mounted on the support. The output shaft of the motor is connected to the roller shaft for transmission. The conveyor belt is fitted around the two roller shafts. Multiple equally spaced partitions are fixedly mounted on the conveyor belt. The distance between two adjacent partitions is larger than the outer diameter of the roadbed drainage pipe body. Baffles that are fastened to the conveyor frame are provided on both sides of the conveyor belt.

[0009] Preferably, the conveyor belt is arranged at an angle with the front end height lower than the rear end height, and a slide is fixedly installed on the platform. The slide is arranged between the conveyor frame and the retention frame and inside the gantry frame. The slide is arranged at an angle with the front end height higher than the rear end height. The front end height of the slide is lower than the rear end height of the conveyor belt, and the rear end height of the slide is higher than the arrangement height of the retention frame.

[0010] Preferably, a vertically arranged retention plate is fixedly installed inside the retention frame, and an opening slot for retaining the roadbed drainage pipe body is provided inside the retention plate. A vertically arranged first cylinder is fixedly installed at the bottom of the platform, and a lifting frame arranged on the side of the retention frame is fastened to the piston rod of the first cylinder. The lifting frame is used to push the roadbed drainage pipe body out of the opening slot.

[0011] Preferably, the placement plate is provided with a first inclined plate portion and a second inclined plate portion, which are arranged on both sides of the opening groove. The front end height of the first inclined plate portion and the second inclined plate portion is higher than the rear end height. A first anti-slip pad is fixedly installed in the opening groove, and a second anti-slip pad is fixedly installed on the top of the lifting frame.

[0012] Preferably, the motion decoupling mechanism includes a housing that is fastened to the gantry frame. A second cylinder arranged laterally is fixedly installed on the side of the housing. An input frame that is fastened to the piston rod of the second cylinder is provided inside the housing. The input frame is slidably engaged with the inner wall of the housing. An output plate arranged vertically is provided inside the input frame. The output plate is slidably engaged with the input frame laterally and simultaneously with the housing vertically. The two ends of the output plate are respectively arranged on both sides of the housing. The bottom end of the output plate is fastened to the support frame.

[0013] Preferably, symmetrically arranged limiting slots are provided on both sides of the input frame, and horizontally arranged sliding columns are fixedly installed in the middle of both sides of the output plate. Vertical slots are provided on both sides of the housing. The sliding columns simultaneously slide with the inner walls of the limiting slots and the vertical slots. The limiting slots are provided with a first horizontal slot, an inclined slot, and a second horizontal slot, which are connected. The first and second horizontal slots are arranged at both ends of the inclined slot. The arrangement height of the first horizontal slot is higher than that of the second horizontal slot. The sliding columns simultaneously slide with the inner walls of the inclined slot and the vertical slot. While the sliding columns slide with the inner walls of the first and second horizontal slots, they are stationary at both ends of the vertical slot.

[0014] Preferably, the support frame has a through slot for the vertical plate portion of the T-shaped plate to pass through, the top of the support frame is provided with a support base plate, a semi-circular disk is fixedly installed on the support base plate, a rotating shaft is installed at the center of the semi-circular disk, the rotating shaft is fastened to the vertical plate portion of the T-shaped plate, a slider is fixedly connected to the end of the vertical plate portion of the T-shaped plate, and a slider that slides with the outer peripheral wall of the semi-circular disk is fixedly connected to it. The outer side of the power cutter is fixedly clamped with a bracket, and the bracket is fixedly installed on the horizontal plate portion of the T-shaped plate.

[0015] Preferably, a grooved plate is fixedly installed on the top of the support frame, and the bottom of the support base plate is slidably engaged with the grooved plate. Multiple first rotating rods are rotatably installed on the support base plate, and the bottom end of each first rotating rod is fastened to a locking block arranged inside the grooved plate. An arc-shaped groove is formed on the surface of the semi-circular disk, and a slidingly engaged rod seat is provided inside the arc-shaped groove. A second rotating rod is provided inside the rod seat, and the end of the second rotating rod is threadedly engaged with the vertical plate of the T-shaped plate. An inclination scale marking area is provided on the inner side of the arc-shaped groove, and a pointer plate arranged outside the inclination scale marking area is fastened to the slider. An insert rod is inserted through the slider, and multiple insertion holes for inserting the insert rod are formed on the outer peripheral wall of the semi-circular disk.

[0016] Preferably, a door panel is installed on the outer side of the platform, and a first compartment door and a second compartment door are respectively flipped on the front end and side of the compartment. The first compartment door has an inlet for the roadbed drainage pipe body to pass through, and the second compartment door has a viewing window. A control panel that is fastened to the compartment is provided on the side of the viewing window.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention features a motion decoupling mechanism fixedly installed on a gantry frame. This mechanism utilizes limiting grooves within the housing, including a first horizontal groove, an inclined groove, and a second horizontal groove, to form a precise sliding fit with the sliding columns on both sides of the output plate and the vertical groove on the housing. When the second cylinder drives the input frame to reciprocate horizontally, the sliding column, under the combined constraint of the limiting groove and the vertical groove, has its motion trajectory forcibly decomposed into four stages: high-position pause, vertical feed, low-position pause, and vertical retraction. Especially after the sliding column enters the second horizontal groove, even if the input frame continues to move horizontally, the sliding column remains stationary at both ends of the vertical groove, thereby ensuring that the support frame and the power tool achieve a predetermined stable pressure holding period at the lowest point. The aforementioned mechanical decoupling design not only eliminates the complex timing control that relies on sensors and programmable logic controllers, but also overcomes the technical defects of large impact, brake position drift and uncontrollable dwell time caused by gas compressibility. It ensures that the drill bit can continuously compress and shape after penetrating the pipe wall, significantly suppressing material springback and burr generation, and greatly improving the smoothness and roundness of the hole wall.

[0018] 2. This invention achieves outstanding technical results by rotatably mounting a T-shaped plate within a support frame and equipping it with a precision tilt adjustment mechanism. Specifically, a semi-circular disk is fixed on the support frame. The vertical plate of the T-shaped plate is rotatably engaged with the center of the semi-circular disk via a rotating shaft, and a slider is fixedly connected to the end of the vertical plate, which slides against the outer peripheral wall of the semi-circular disk. The operator only needs to release the second rotating rod within the arc-shaped groove to push the T-shaped plate to rotate around the rotating shaft. The slider then slides along the outer arc surface of the semi-circular disk, causing the horizontal plate and multiple power cutters arranged at equal intervals on it to synchronously change their axial angles. At the same time, the pointer plate fixed to the slider engages with the tilt scale marking area on the side of the semi-circular disk to achieve accurate angle readings; while the through-hole rod inside the slider engages with multiple insertion holes on the outer peripheral wall of the semi-circular disk to quickly complete the positioning and locking of typical angles. The aforementioned structure allows the feed direction of the power cutter to be continuously adjustable within a certain range and to remain stably locked, thereby flexibly meeting the requirements of different drainage design specifications for inclined holes. This not only enhances the water collection effect but also prevents external mud and sand from vertically entering the pipe, greatly expanding the applicability of the equipment under various roadbed conditions.

[0019] 3. The conveyor belt of this invention is arranged at an angle with the front end lower than the rear end, and is equipped with equally spaced partitions to achieve stable lifting and orderly release of the pipe. After the pipe leaves the conveyor belt, it automatically rolls into the opening slot of the retaining frame along the reverse inclined slide, and completes precise positioning without power with the help of the first inclined plate, the second inclined plate, and the first anti-slip pad on the retaining plate. At the same time, after the hole is drilled, the first cylinder drives the lifting frame to push the pipe out of the opening slot, guides it through the second inclined plate, and drops it into the slot opening and slides out smoothly through the pipe outlet. Throughout the process, the stable pressure holding provided by the motion decoupling mechanism and the flexible tilt angle provided by the T-shaped plate complement each other, ensuring the hole wall quality of each seepage hole, and being compatible with various processing modes of straight and inclined holes. At the same time, gravity-assisted conveying reduces the number of power components and sensors, reducing control complexity and failure rate. Therefore, this invention significantly improves the hole wall forming quality and achieves wide adaptability to various roadbed drainage conditions, solving the dual drawbacks of poor quality and narrow range of existing equipment, and thus has a very broad application prospect. Attached Figure Description

[0020] To more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the overall device structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall device structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the top structure arrangement of the platform body according to the present invention; Figure 4 This is a schematic diagram of the assembly structure of the conveyor frame, gantry frame, and placement frame of the present invention. Figure 5 This is a schematic diagram of the conveyor belt installation structure of the present invention; Figure 6 This is a schematic diagram of the installation structure of the motion decoupling mechanism of the present invention; Figure 7 This is a schematic diagram of the support frame installation structure of the present invention; Figure 8 This is a schematic diagram of the housing installation structure of the present invention; Figure 9 This is a schematic diagram of the input frame mounting structure of the present invention; Figure 10 This is a schematic diagram of the sliding column mounting structure of the present invention; Figure 11 This is a schematic diagram of the limiting groove structure of the present invention; Figure 12 This is a schematic diagram of the semi-circular disk mounting structure of the present invention; Figure 13 This is a schematic diagram of the arc-shaped groove arrangement structure of the present invention; Figure 14 This is a schematic diagram of the card block mounting structure of the present invention; Figure 15 This is a schematic diagram of the T-shaped plate structure of the present invention; Figure 16 This is a schematic diagram of the indwelling frame installation structure of the present invention; Figure 17 This is a schematic diagram of the lifting frame installation structure of the present invention; Figure 18 This is a schematic diagram of the indwelling plate installation structure of the present invention; In the diagram: 1. Platform, 2. Warehouse, 3. Platform plate, 4. Conveyor frame, 5. Roadbed drainage pipe body, 6. Conveyor belt, 7. Gantry frame, 8. Retention frame, 9. Motion decoupling mechanism, 901. Box, 902. Second cylinder, 903. Input frame, 904. Output plate, 905. Restriction groove, 90501. First horizontal groove, 90502. Inclined groove, 90503. Second horizontal groove, 906. Sliding column, 907. Vertical groove, 10. Bearing frame, 11. T-shaped plate, 12. Power cutter, 13. Groove opening, 14. Outlet pipe, 15. Roller, 16. Support, 17. Motor, 18. Partition plate, 19. Baffle plate, 20. Sliding... 21. Frame, 22. Placement plate, 23. Opening slot, 24. First cylinder, 25. Lifting frame, 26. First inclined plate, 27. Second inclined plate, 28. First anti-slip pad, 29. Through slot, 30. Support base plate, 31. Semi-circular disc, 32. Rotating shaft, 33. Slider, 34. Bracket, 35. Groove plate, 36. First rotating rod, 37. Locking block, 38. Arc groove, 39. Rod seat, 40. Second rotating rod, 41. Inclined angle scale marking area, 42. Pointer plate, 43. Insert rod, 44. Insertion hole, 45. Door panel, 46. First compartment door, 47. Second compartment door, 48. Inlet pipe, 49. Viewing window, 50. Control panel. Detailed Implementation

[0021] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] This specific embodiment provides a device for equally spaced drilling of drainage pipes in roadbeds, such as... Figures 1-18 As shown, this equipment is mainly used for automated and high-precision processing of equally spaced seepage holes in the body 5 of the roadbed drainage pipe, and is especially suitable for drainage pipe production scenarios that require inclined holes and high hole wall quality.

[0023] The entire equipment comprises a platform 1 that serves as the overall supporting foundation. Platform 1 is constructed from a welded rectangular steel tube frame, possessing sufficient rigidity and strength to withstand the impact loads during the drilling process. Adjustable height feet can be installed at the four corners of the platform's base for easy on-site leveling. A door panel 45 is installed on the outer side of platform 1 to enclose the internal electrical wiring and gas pipelines, improving the equipment's safety and tidiness.

[0024] A chamber 2 is fixedly installed above the platform 1. Chamber 2 is a hollow box-like structure, forming a closed working space inside, which prevents debris from flying during drilling and reduces noise transmission. The front and sides of chamber 2 are hinged to have a first chamber door 46 and a second chamber door 47, respectively, facilitating loading, debugging, and routine maintenance by operators. The first chamber door 46 has an inlet 48 for the roadbed drainage pipe body 5 to pass through. This inlet 48 is rectangular, with a width greater than the length of the roadbed drainage pipe body 5, and a height sufficient to allow the pipe body 5 to be inserted smoothly. Operators can stand at the front of the equipment and feed the roadbed drainage pipe body 5 one by one into the chamber 2 through the inlet 48. The second chamber door 47 has a viewing window 49, which can be made of high-strength transparent material, allowing operators to observe the drilling status, pipe position, and tool wear inside the chamber 2 in real time. A control panel 50, which is securely connected to the chamber 2, is located on the side of the viewing window 49. The control panel 50 integrates a touch screen, a start / stop button, an emergency stop switch, and status indicator lights, and is internally electrically connected to a programmable logic controller. Through the control panel 50, the operator can set the rotation frequency of the motor 17, adjust the operating frequency of the second cylinder 902, control the start and stop of the power cutter 12, and switch between manual and automatic modes.

[0025] Inside the hopper 2, a platform 3 is fixedly connected to the top of the platform 1. The platform 3 is assembled from two metal plates of uniform thickness. The platform 3 is divided into three functional areas from front to back along the direction of pipe travel: the front section is the conveying area, the middle section is the drilling operation area, and the rear section is the discharge area. All functional components are directly or indirectly installed on the platform 3, thereby ensuring the relative positional accuracy between the components and ensuring the consistency of the drilling position.

[0026] Reference Figure 3 , Figure 4 and Figure 5 At the front section of the platform 3 (i.e., the end near the inlet 48), multiple conveyor frames 4 are fixedly installed. Each pair of conveyor frames 4 forms a group, and each conveyor frame 4 is fastened to the platform 3 by bolts. The same roller 15 is rotatably mounted inside the two conveyor frames 4 in a group. There are two rollers 15 in the front section of the platform 3; the roller 15 at the rear end is the driving roller, and the roller 15 at the front end is the driven roller. To increase the friction between the roller 15 and the conveyor belt 6, the outer circumferential surface of the roller 15 can be covered with a layer of rubber.

[0027] A support 16 is also fixedly installed on the platform 3, and a motor 17 is fixedly installed on the support 16. The motor 17 is preferably a stepper motor to precisely control the stepping distance of the conveyor belt 6. The output shaft of the motor 17 is connected to the shaft end of the rear roller 15 via a coupling. When the motor 17 rotates, the roller 15 drives the conveyor belt 6 to run.

[0028] The conveyor belt 6 is fitted around the two rollers 15, forming a closed loop. The conveyor belt 6 is made of wear-resistant rubber, and its outer surface is fixedly fitted with multiple equally spaced partitions 18. The spacing between two adjacent partitions 18 is designed to be larger than the outer diameter of the roadbed drainage pipe body 5, typically by 5-15 mm. This allows operators to place a single roadbed drainage pipe body 5 into the groove between two partitions 18, with the partitions 18 acting as separators and pushers to prevent the pipes from rolling downwards or colliding with each other during inclined transport. Simultaneously, baffles 19 are installed on both sides of the conveyor belt 6 and are securely connected to the conveyor frame 4. The height of the baffles 19 is higher than the radius of the roadbed drainage pipe body 5, and their inner surfaces are smooth, ensuring that the pipes do not slip off the sides of the conveyor belt, forming a three-sided limiting conveying channel.

[0029] To fully utilize gravity to assist the pipe in moving to the rear end, reduce the load on the conveyor belt 6, and simplify the control logic, this embodiment designs the conveyor belt 6 with an inclined arrangement. Specifically, the height of the front end (i.e., the feed end) of the conveyor belt 6 is lower than the height of its rear end (i.e., the discharge end). This inclination angle is typically set to 5°-10°, which ensures that the pipe is stably placed between the partitions 18 without causing the pipe to roll before reaching the end point due to an excessively large inclination angle. When the motor 17 drives the conveyor belt 6 to move upward, the roadbed drainage pipe body 5 placed between the partitions 18 is gradually lifted until it reaches the highest point of the conveyor belt 6.

[0030] Reference Figure 3 and Figure 4 A slide 20 is fixedly installed behind the conveyor frame 4 and in the middle of the platform 3. The slide 20 is positioned between the conveyor frame 4 and the subsequent retaining frame 8, and from a top view, the slide 20 is located in the inner space of the gantry frame 7, thus saving the lateral dimension of the overall layout.

[0031] The slide 20 also adopts an inclined arrangement, but in the opposite direction to the inclination of the conveyor belt 6: the front end of the slide 20 (the end closer to the conveyor belt 6) is higher than its rear end (the end closer to the retaining frame 8). This reverse inclination design is key to achieving unpowered rolling of the pipe. Simultaneously, the front end of the slide 20 is lower than the rear end of the conveyor belt 6, ensuring that when the conveyor belt 6 transports the roadbed drainage pipe body 5 to its highest point, the pipe naturally detaches from the conveyor belt 6 and falls onto the front surface of the slide 20. The cross-sectional shape of the slide 20 is a flat groove with side flanges to prevent the pipe from deviating from the track during rolling. The inclination angle of the slide 20 is generally designed to be 10°-25° to ensure a moderate rolling speed, preventing it from rushing out of the retaining frame 8 due to excessive speed or getting stuck on the slide 20 due to excessive slowness. This mechanical transition structure, without the need for additional power drive and sensor control, achieves automatic transfer of the pipe from the conveyor belt to the drilling station, reducing equipment costs and failure rates.

[0032] After the roadbed drainage pipe body 5 rolls down from the rear end of the slide 20, it needs to stop precisely at a fixed drilling position and be reliably clamped and restrained at that position to prevent movement or rotation during drilling. For this purpose, a retaining frame 8 is fixedly installed in the middle section of the platform 3.

[0033] Reference Figure 16 , Figure 17 and Figure 18 The retaining frame 8 is welded from steel plates, and its bottom is fastened to the platform 3 with bolts. A vertically arranged retaining plate 21 is fixedly installed on the inner side of the retaining frame 8. An opening slot 22 is provided in the central area of ​​the retaining plate 21 for retaining the roadbed drainage pipe body 5. The opening slot 22 is designed as a square groove structure that matches the outer circle of the pipe, allowing the pipe to be inserted into the slot and stably restrained.

[0034] To ensure that the pipe rolling off the carriage 20 can smoothly enter the opening slot 22, the retaining plate 21 is also provided with a first inclined plate portion 25 and a second inclined plate portion 26. These two inclined plates are respectively arranged on both sides of the opening slot 22. In this embodiment, the pipe rolls in from the carriage 20 along the length of the equipment; therefore, the first inclined plate portion 25 is located on the inlet side of the opening slot 22 (the side closer to the carriage 20), and the second inclined plate portion 26 is located on the outlet side of the opening slot 22 (the side closer to the slot opening 13). The front ends (i.e., the higher ends) of both the first inclined plate portion 25 and the second inclined plate portion 26 are higher than their rear ends (i.e., the lower ends), and their inclination direction is towards the opening slot 22. In this way, regardless of which side the pipe deviates from when rolling down, it will be guided into the opening slot 22 by the inclined plates. The surfaces of the first inclined plate portion 25 and the second inclined plate portion 26 are smoothed to reduce rolling resistance.

[0035] Inside the opening groove 22, a first anti-slip pad 27 is fixedly installed. The first anti-slip pad 27 is made of rubber elastomer material, and its surface has a diamond pattern. When the roadbed drainage pipe body 5 is in the opening groove 22, under its own weight and the clamping force that may be applied later, the first anti-slip pad 27 will undergo elastic deformation, tightly adhering to the surface of the pipe, thereby increasing friction and preventing the pipe from rotating circumferentially due to the rotational torque of the tool during drilling.

[0036] In addition to the positioning function of the placement frame 8 itself, this equipment is also equipped with an auxiliary positioning and lifting mechanism. Inside the platform 1, a vertically arranged first cylinder 23 is fixedly installed below the platform plate 3. The piston rod of the first cylinder 23 passes vertically upward through the clearance hole on the platform plate 3, and its end is fastened to the lifting frame 24. The lifting frame 24 is arranged on the side of the placement frame 8, and its position corresponds to the position directly below the opening slot 22. The top shape of the lifting frame 24 fits the bottom of the pipe, and a second anti-slip pad 28, also made of rubber elastomer material, is fixedly installed on its top. When it is necessary to remove the pipe from the opening slot 22, the piston rod of the first cylinder 23 extends, the lifting frame 24 moves upward, and lifts the pipe from the opening slot 22. After being lifted, due to the presence of the second inclined plate 26, the pipe will roll backward along the second inclined plate 26 and enter the discharge channel. Before the next drilling, the lifting frame 24 retracts, waiting for the next pipe to fall into the opening slot 22.

[0037] Reference Figures 4 to 11 A gantry frame 7 is fixedly installed in the middle section of the platform 3, above the retaining frame 8. The gantry frame 7 is a portal frame structure, which is bolted to the platform 3. The gantry frame 7 provides sufficient rigidity and span to allow the motion decoupling mechanism 9 to be installed on it.

[0038] The motion decoupling mechanism 9 is one of the core features that distinguishes this invention from existing technologies. Its function is to decouple the continuous horizontal reciprocating linear motion on the input side into a vertical reciprocating intermittent motion on the output side with predetermined pause periods at both ends of the stroke. This mechanism is implemented using a mechanical structure, avoiding the use of sensors and complex PLC timing control, while simultaneously achieving stable pressure holding and dwell of the drilling tool at the lowest point.

[0039] Specifically, the motion decoupling mechanism 9 includes a housing 901, which is bolted to the top horizontal plate of the gantry 7. The housing 901 is a closed rectangular shell with a hollow interior, possessing sufficient rigidity and precision. A transversely arranged second cylinder 902 is fixedly mounted on the side of the housing 901. The cylinder body of the second cylinder 902 is fixed to the housing 901 via a corner seat, and the piston rod of the second cylinder 902 extends into the housing 901.

[0040] An input frame 903 is installed inside the housing 901. The input frame 903 is a roughly rectangular sliding component, whose bottom, top, and sides can slide against the inner wall of the housing 901. The input frame 903 can only reciprocate laterally in the horizontal direction. The piston rod end of the second cylinder 902 is fastened to one side of the input frame 903. Therefore, when the second cylinder 902 is energized, the extension and retraction of the piston rod will directly drive the input frame 903 to move left and right within the housing 901.

[0041] An output plate 904 is installed inside the input rack 903. The output plate 904 is a vertically arranged rectangular plate, with its upper and lower ends extending beyond the top and bottom of the input rack 903, respectively. The outer wall of the output plate 904 is in sliding engagement with the inner wall of the input rack 903. At the same time, the output plate 904 and the housing 901 can be vertically slidably engaged.

[0042] The output plate 904 is positioned on both sides of the housing 901, with its bottom end passing through an opening at the bottom of the housing 901 and being securely connected to the support frame 10 via a connecting flange. Therefore, the vertical movement of the output plate 904 directly drives the support frame 10 and all the perforated components on it to move up and down.

[0043] For motion conversion, symmetrically arranged limiting slots 905 are provided on both sides of the input frame 903. The limiting slot 905 is a continuous irregular curved slot. Meanwhile, horizontally arranged sliding pillars 906 are fixedly installed on the middle of both sides of the output plate 904. One end of each sliding pillar 906 is fixed to the output plate 904, and the other end extends into the limiting slot 905. Furthermore, vertical slots 907 are provided on both sides of the housing 901, and the sliding pillars 906 also pass through the vertical slots 907. That is, the sliding pillars 906 simultaneously slide against the inner walls of both the limiting slots 905 and the vertical slots 907.

[0044] The vertical groove 907 is a straight, elongated groove that forces the sliding column 906 to move only vertically throughout the entire movement, preventing any horizontal displacement. The limiting groove 905 is located on the input frame 903. When the input frame 903 moves horizontally, the limiting groove 905 moves relative to the sliding column 906. Because the vertical direction of the sliding column 906 is restricted by the vertical groove 907, the groove wall of the limiting groove 905 exerts a lateral force on the sliding column 906, forcing it to slide upwards or downwards within the vertical groove 907.

[0045] Please refer to the following carefully. Figure 11The limiting slot 905 is provided with a first horizontal straight slot 90501, an inclined slot 90502, and a second horizontal straight slot 90503 that are connected in sequence. The first horizontal straight slot 90501 and the second horizontal straight slot 90503 are both horizontal straight slots, located at both ends of the inclined slot 90502, and the arrangement height of the first horizontal straight slot 90501 is higher than the arrangement height of the second horizontal straight slot 90503.

[0046] The working process of motion decoupling mechanism 9 is as follows: When the piston rod of the second cylinder 902 extends, pushing the input frame 903 to move horizontally to the right, the sliding column 906 is initially located within the first horizontal groove 90501. Since this groove is horizontal, and the sliding column 906 is restricted to vertical movement by the vertical groove 907, but the first horizontal groove 90501 does not provide vertical displacement space for the sliding column 906, the sliding column 906 remains stationary, corresponding to the output plate 904 and the support frame 10 being at their highest point and remaining stationary. During this stage, the tubing on the carriage 20 can safely roll into the opening groove 22 of the retaining frame 8 without interfering with the cutting tool.

[0047] As the input frame 903 continues to move to the right, the sliding column 906 gradually moves relative to the inclined groove 90502. At this time, due to the lateral relative movement of the sliding column 906 being acted upon by the inclined groove wall, the sliding column 906 is forced to slide along the vertical groove 907. When the sliding column 906 moves downward, it drives the output plate 904 to move downward, which in turn drives the support frame 10 and the power cutter 12 to perform a downward feed motion, drilling holes in the pipe.

[0048] When the slide column 906 moves to the end of the inclined groove 90502 and enters the second horizontal groove 90503, this groove is horizontal. Therefore, even if the input frame 903 continues to move to the right, the slide column 906 no longer produces vertical displacement, and the output plate 904 and the support frame 10 remain stationary at the lowest point. During this stage, the cutting head of the power cutter 12 presses stably against the tube, continuously penetrating the tube wall and maintaining this position for a period of time (determined by the stroke speed of the second cylinder 902 and the length of the second horizontal groove 90503). This pause significantly improves the hole wall quality, allows for complete chip separation, and reduces material springback and burrs.

[0049] When the piston rod of the second cylinder 902 retracts, pulling the input frame 903 to the left, the working process is reversed; the slide column 906 first enters the inclined groove 90502 from the second horizontal groove 90503, is forced to slide upward, and drives the output plate 904 to rise, completing the retraction; then the slide column 906 enters the first horizontal groove 90501, and the output plate 904 stops again at the highest point, waiting for the next tube to be positioned. This cycle repeats, realizing an intermittent drilling action with a clear terminal pause.

[0050] A support frame 10 is fixedly mounted on the output side (i.e., the bottom end of the output plate 904) of the motion decoupling mechanism 9. (Refer to...) Figures 12 to 15 The support frame 10 has a through slot 29 for the vertical portion of the T-shaped plate 11 to pass through. The width of the through slot 29 is slightly larger than the thickness of the vertical portion of the T-shaped plate 11, allowing it to swing freely within the slot. A support base plate 30 is provided on the top of the support frame 10. The support base plate 30 is not fixedly connected to the support frame 10, but is adjusted back and forth by a set of sliding mechanisms. Specifically, a grooved plate 35 is fixedly installed on the top of the support frame 10. A rectangular groove is formed on the upper surface of the grooved plate 35, and the bottom of the support base plate 30 slides in conjunction with the grooved plate 35. Multiple first rotating rods 36 are rotatably mounted on the support base plate 30. The bottom end of each first rotating rod 36 is fastened to a locking block 37 arranged inside the grooved plate 35. When the first rotating rod 36 is tightened, the locking block 37 presses upward against the inner wall of the grooved plate 35, thereby locking the support base plate 30 at any position on the grooved plate 35. This design allows the entire T-shaped plate 11 to move laterally to adjust the offset of the drilling position relative to the pipe axis, adapting to different pipe diameters or hole position requirements.

[0051] A semi-circular disk 31 is fixedly mounted on the support base plate 30. The semi-circular disk 31 is a semi-circular metal block, and its circular periphery is precision machined. A rotating shaft 32 is installed at the center of the semi-circular disk 31. The rotating shaft 32 is fastened to the vertical plate of the T-shaped plate 11. The T-shaped plate 11 is generally inverted T-shaped, with its vertical plate passing upward through the through groove 29 and connecting to the rotating shaft 32, and its horizontal plate extending laterally at the bottom for mounting multiple power cutting tools 12.

[0052] A slider 33 is fixedly connected to the vertical end of the T-shaped plate 11 (i.e., the side closest to the outer peripheral wall of the semi-circular disc 31). The bottom of the slider 33 slides against the outer peripheral wall of the semi-circular disc 31, and grease can be applied between them to reduce friction. When the T-shaped plate 11 rotates around the pivot 32, the slider 33 slides along the outer arc surface of the semi-circular disc 31, thereby precisely changing the tilt angle of the T-shaped plate 11. Since the horizontal and vertical portions of the T-shaped plate 11 remain perpendicular to each other, the axis of the horizontal portion and the power tool 12 on it also changes angle accordingly, realizing the machining of oblique holes.

[0053] The powered cutting tool 12 is typically an electrically operated rotary spindle that holds the drill bit; a hollow drill or a hole opener can also be used, and the extension length of the drill bit is adjustable. Multiple powered cutting tools 12 are arranged at equal intervals on the horizontal and vertical sections of the T-shaped plate 11, with the spacing matching the required spacing of the seepage holes in the drainage pipe. Each powered cutting tool 12 is fixedly clamped to its outer side with a bracket 34, which is bolted to the horizontal and vertical sections of the T-shaped plate 11. The bracket 34 can be designed as an adjustable clamping structure to compensate for differences in the length of different cutting tools.

[0054] To precisely control and lock the tilt angle of the T-plate 11, this embodiment also provides a precision adjustment and reading mechanism. An arc-shaped groove 38 is formed on the surface of the semi-circular disc 31, with the center of the groove 38 coinciding with the axis of the rotating shaft 32. A slidingly fitted rod seat 39 is provided inside the arc-shaped groove 38, allowing the rod seat 39 to slide along an arc within the groove. A second rotating rod 40 is provided inside the rod seat 39, with its end threadedly connected to the vertical plate portion of the T-plate 11. Specifically, the second rotating rod 40 passes through the rod seat 39, and its front end is screwed into a threaded hole on the vertical plate portion of the T-plate 11. When angle adjustment is required, the second rotating rod 40 is slightly loosened to reduce the pressure between the rod seat 39 and the sidewall of the arc-shaped groove 38. Then, the T-plate 11 is manually pushed or rotated using a tool, causing the slider 33 to slide along the outer circumference of the semi-circular disc 31, and the rod seat 39 to move synchronously within the arc-shaped groove 38. After adjustment, tighten the second rotating rod 40, and the rod seat 39 is pressed against the side wall of the arc groove 38, thereby locking the angle of the T-shaped plate 11.

[0055] To allow for intuitive reading of angle values, an inclination scale marking area 41 is provided on the inner side of the arc-shaped groove 38 (i.e., on the side of the semi-circular disc 31). The inclination scale marking area 41 is engraved with angle scale lines, such as 0°, ±15°, ±30°, etc., with 0° corresponding to the vertical direction. A pointer plate 42, securely connected to the slider 33, is positioned on the outer side of the inclination scale marking area 41, with its tip pointing towards the scale line. When the slider 33 rotates, the pointer plate 42 rotates synchronously, allowing the operator to clearly see the current inclination angle of the tool. Furthermore, for quick positioning of commonly used angles, a insertion rod 43 is inserted through the slider 33, allowing axial movement within the hole of the slider 33. Multiple insertion holes 44 are provided on the outer peripheral wall of the semi-circular disc 31 to engage with the insertion rod 43, corresponding to typical angles (such as 0°, 15°, 30°, etc.). When the insertion rod 43 is inserted into the corresponding insertion hole 44, the angle can be quickly and coarsely positioned, and then fine-tuned through the arc groove 38 and the rod seat 39. This double locking structure ensures that the tool angle will not change due to vibration during the drilling process.

[0056] Reference Figure 3 and Figure 16 A slot 13 is fixedly provided at the rear end of the platform 3. This slot 13 is used to allow the drilled roadbed drainage pipe body 5 to pass through. The slot 13 is usually rectangular in shape, and its size is larger than the external dimensions of the roadbed drainage pipe body 5, so as to ensure that the pipe can fall smoothly. A pipe outlet cylinder 14 is fixedly provided at the bottom of the slot 13. The pipe outlet cylinder 14 is a downwardly sloping square cylinder, and its sloping direction faces outward of the equipment. The inner wall of the pipe outlet cylinder 14 is smooth, and a nylon bushing can be installed if necessary to reduce noise and friction.

[0057] When the first cylinder 23 drives the lifting frame 24 to push the roadbed drainage pipe body 5 out of the opening slot 22, the pipe will roll along the second inclined plate 26 due to the lower rear end of the second inclined plate 26, passing over the rear edge of the retention frame 8 and falling into the slot 13. After entering the slot 13, the pipe is received by the outlet pipe 14 and slides out of the equipment along the inclined direction of the outlet pipe 14, falling into the collection box or conveyor belt placed behind the equipment, completing a complete work cycle.

[0058] The overall working process of this equipment is as follows: The operator starts the equipment via control panel 50, and motor 17, second cylinder 902, and power cutter 12 enter standby mode. The operator inserts the roadbed drainage pipe bodies 5 one by one into the inlet 48 of the first compartment door 46, ensuring that each pipe falls between the two partitions 18 of the conveyor belt 6. Motor 17 intermittently and continuously drives the conveyor belt 6 upward according to the set rhythm, transporting the pipes to the top of the conveyor belt 6 near the slide 20. After the pipes leave the conveyor belt 6, they roll down onto the slide 20 by gravity and roll along the slide 20 into the opening slot 22 of the retention rack 8, where they are stably positioned by the first anti-slip pad 27.

[0059] At this time, the second cylinder 902 in the motion decoupling mechanism 9 is activated, driving the input frame 903 to move horizontally. Through the cooperation of the limiting groove 905, the sliding column 906, and the vertical groove 907, the output plate 904 first maintains a high position during the upper pause period to ensure that the pipe is in place before starting to feed downwards. During the lower pause period, the power cutter 12 performs stable pressure holding and drilling on the pipe, then retracts the cutter and returns to the high position for a pause. During the drilling process, if an angled hole is required, the operator can loosen the second rotating rod 40 in advance, rotate the T-shaped plate 11 to the required angle, confirm it through the tilt angle scale marking area 41 and the pointer plate 42, then lock it, and then start the automatic cycle.

[0060] After drilling is completed, the first cylinder 23 extends, and the lifting frame 24 pushes the pipe out of the opening slot 22. The pipe rolls along the second inclined plate 26 into the slot 13 and slides out of the equipment through the pipe outlet 14. Then the first cylinder 23 retracts, waiting for the next pipe. This process is repeated to achieve fully automatic equal-spaced drilling.

[0061] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A roadbed drainage pipe equal-spacing drilling device, comprising a platform (1), characterized in that, A storage chamber (2) is fixedly installed on the platform (1). Inside the storage chamber (2) is a platform plate (3) that is fastened to the platform (1). A conveyor frame (4) is fixedly installed on the front section of the platform plate (3). A conveyor belt (6) for conveying the roadbed drainage pipe body (5) is rotatably installed on the conveyor frame (4). A gantry frame (7) and a retention frame (8) are fixedly installed in the middle section of the platform plate (3). The retention frame (8) is used to stabilize the roadbed drainage pipe body (5). A motion decoupling mechanism (9) is fixedly installed on the gantry frame (7). The motion decoupling mechanism (9) is used to... The continuous horizontal reciprocating linear motion on the input side is decoupled and converted into a vertical reciprocating intermittent motion on the output side with a predetermined pause period at both ends of the stroke. The output side of the decoupling mechanism (9) is fixedly installed with a support frame (10). A T-shaped plate (11) for adjusting the tilt angle is rotatably installed inside the support frame (10). Multiple power cutters (12) for drilling are installed on the side of the T-shaped plate (11). A slot (13) for the roadbed drainage pipe body (5) to pass through is fixedly opened at the rear end of the platform (3). A pipe outlet cylinder (14) is fixedly installed at the bottom of the slot (13).

2. The equal-spacing drilling device for roadbed drainage pipes according to claim 1, characterized in that, The conveyor frame (4) has two rollers (15) rotatably mounted inside each. A support (16) is fixedly mounted on the platform (3). A motor (17) is fixedly mounted on the support (16). The output shaft of the motor (17) is connected to the rollers (15) for transmission. The conveyor belt (6) is fitted around the two rollers (15). Multiple partitions (18) are fixedly mounted on the conveyor belt (6) at equal intervals. The distance between two adjacent partitions (18) is greater than the outer diameter of the roadbed drainage pipe body (5). Baffles (19) are provided on both sides of the conveyor belt (6) and are fastened to the conveyor frame (4).

3. The equal-spacing drilling device for roadbed drainage pipes according to claim 1, characterized in that, The conveyor belt (6) is arranged at an angle and the height of the front end is lower than the height of the rear end. A slide (20) is fixedly installed on the platform (3). The slide (20) is arranged between the conveyor frame (4) and the retention frame (8) and is arranged inside the gantry frame (7). The slide (20) is arranged at an angle and the height of the front end is higher than the height of the rear end. The height of the front end of the slide (20) is lower than the height of the rear end of the conveyor belt (6), and the height of the rear end of the slide (20) is higher than the arrangement height of the retention frame (8).

4. The equal-spacing drilling device for roadbed drainage pipes according to claim 1, characterized in that, The placement frame (8) is fixedly installed with a vertically arranged placement plate (21). The placement plate (21) is provided with an opening slot (22) for placing the roadbed drainage pipe body (5). The bottom of the platform (1) is fixedly installed with a vertically arranged first cylinder (23). The piston rod of the first cylinder (23) is fastened to a lifting frame (24) arranged on the side of the placement frame (8). The lifting frame (24) is used to push the roadbed drainage pipe body (5) out of the opening slot (22).

5. The equal-spacing drilling device for roadbed drainage pipes according to claim 4, characterized in that, The retention plate (21) is provided with a first inclined plate (25) and a second inclined plate (26). The first inclined plate (25) and the second inclined plate (26) are arranged on both sides of the opening groove (22). The front end height of the first inclined plate (25) and the second inclined plate (26) is higher than the rear end height. A first anti-slip pad (27) is fixedly installed in the opening groove (22), and a second anti-slip pad (28) is fixedly installed on the top of the lifting frame (24).

6. The equal-spacing drilling device for roadbed drainage pipes according to claim 1, characterized in that, The motion decoupling mechanism (9) includes a housing (901) that is fastened to the gantry (7). A second cylinder (902) arranged horizontally is fixedly installed on the side of the housing (901). An input frame (903) that is fastened to the piston rod of the second cylinder (902) is provided inside the housing (901). The input frame (903) slides with the inner wall of the housing (901). An output plate (904) is arranged vertically inside the input frame (903). The output plate (904) slides horizontally with the input frame (903) and simultaneously slides vertically with the housing (901). The two ends of the output plate (904) are respectively arranged on both sides of the housing (901). The bottom end of the output plate (904) is fastened to the support frame (10).

7. The equal-spacing drilling device for roadbed drainage pipes according to claim 6, characterized in that, The input frame (903) has symmetrically arranged limiting slots (905) on both sides. The output plate (904) has horizontally arranged sliding columns (906) fixedly installed in the middle of both sides. The housing (901) has vertical slots (907) on both sides. The sliding columns (906) simultaneously slide against the inner walls of the limiting slots (905) and the vertical slots (907). The limiting slots (905) are provided with a first horizontal groove (90501), an inclined groove (90502), and a second horizontal groove (90503) that are connected. The first horizontal groove... (90501) The second horizontal groove (90503) is arranged at both ends of the inclined groove (90502). The arrangement height of the first horizontal groove (90501) is higher than that of the second horizontal groove (90503). The sliding column (906) simultaneously slides with the inner walls of the inclined groove (90502) and the vertical groove (907). While the sliding column (906) slides with the inner walls of the first horizontal groove (90501) and the second horizontal groove (90503), the sliding column (906) is stationary at both ends of the vertical groove (907).

8. The equal-spacing drilling device for roadbed drainage pipes according to claim 1, characterized in that, The support frame (10) has a through slot (29) for the vertical plate portion of the T-shaped plate (11) to pass through. The top of the support frame (10) is provided with a support base plate (30). A semi-circular disc (31) is fixedly installed on the support base plate (30). A rotating shaft (32) is installed at the center of the semi-circular disc (31). The rotating shaft (32) is tightly connected to the vertical plate portion of the T-shaped plate (11). A slider (33) that slides with the outer peripheral wall of the semi-circular disc (31) is fixedly connected to the end of the vertical plate portion of the T-shaped plate (11). A bracket (34) is fixedly clamped on the outer side of the power cutter (12). The bracket (34) is fixedly installed on the horizontal plate portion of the T-shaped plate (11).

9. The equal-spacing drilling device for roadbed drainage pipes according to claim 8, characterized in that, A grooved plate (35) is fixedly installed on the top of the support frame (10). The bottom of the support base plate (30) is slidably engaged with the grooved plate (35). Multiple first rotating rods (36) are rotatably installed on the support base plate (30). The bottom end of each first rotating rod (36) is fastened with a locking block (37) arranged inside the grooved plate (35). An arc-shaped groove (38) is opened on the surface of the semi-circular disc (31). A slidingly engaged rod seat (39) is provided inside the arc-shaped groove (38). (39) is provided with a second rotating rod (40), the end of which is threadedly connected to the vertical plate of the T-shaped plate (11); the inner side of the arc groove (38) is provided with an inclination scale marking area (41), and the slider (33) is fastened to a pointer plate (42) arranged outside the inclination scale marking area (41); a plug rod (43) is placed through the slider (33), and multiple insertion holes (44) for plugging into the plug rod (43) are opened on the outer peripheral wall of the semi-circular disc (31).

10. The equal-spacing drilling device for roadbed drainage pipes according to claim 1, characterized in that, A door panel (45) is installed on the outside of the platform (1). The front end and side of the silo (2) are respectively fitted with a first silo door (46) and a second silo door (47). The first silo door (46) has an inlet (48) for the roadbed drainage pipe body (5) to pass through. The second silo door (47) has a viewing window (49). The side of the viewing window (49) is provided with a control panel (50) that is fastened to the silo (2).

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