A medical gas pipeline tube detection device

Abstract

This invention relates to the field of pneumatic logistics pipeline inspection technology, and more particularly to a pipeline inspection device for medical pneumatic logistics pipelines. The device includes a frame with a first side frame, a second side frame, and a third side frame mounted on it. A straight pipe is connected between the first and second side frames. A first and second conveying base are movably connected within the frame. A straight pipe inspection component is mounted on the first conveying base, and an arc pipe inspection component is mounted on the second conveying base. An arc-shaped frame is mounted on the third side frame. This design reduces the possibility of difficulty in internal pipeline inspection after prolonged use of pneumatic material pipelines, lowers the need for extensive manual inspection during the inspection process, improves the efficiency of automated inspection, and enables multi-functional inspection of different pipe types. It also enhances the ease of operation of the device, provides stronger comparative analysis of the inspection process, and offers better intuitiveness.

Description

Technical Field

[0001] This invention relates to the field of pneumatic tube inspection technology, and more particularly to a tube inspection device for medical pneumatic tubes. Background Technology

[0002] Medical pneumatic logistics systems are indispensable core logistics facilities in modern hospitals, primarily used to transport various medical supplies such as medicines, specimens, instruments, and medical records. Their operational efficiency and safety directly impact the smooth operation of hospital procedures and patient safety. Among these, the pneumatic logistics pipeline, as the core carrier of material transport, has key indicators such as structural integrity, inner wall smoothness, dimensional accuracy, and pressure resistance. These directly determine the logistics system's transport stability, noise control, and service life. If the pipeline has problems such as wear, deformation, uneven inner walls, dimensional deviations, or insufficient pressure resistance, it can easily lead to jamming in the logistics compartment, damage to materials, and even pipeline leaks or ruptures, affecting the timely delivery of medical supplies and delaying treatment processes.

[0003] Currently, existing testing equipment for medical pneumatic tube systems often suffers from limited functionality, typically only capable of testing either straight or curved pipes. This prevents integrated testing of both types of pipes, necessitating hospitals or pipe manufacturers to equip themselves with multiple sets of equipment. This not only increases equipment costs but also occupies significant testing space and reduces efficiency. Furthermore, existing testing equipment suffers from low automation, requiring frequent manual adjustments to pipe positions and replacement of testing components. This cumbersome operation increases labor intensity and increases the risk of inaccurate results due to human error. Moreover, continuous and efficient testing is not feasible, making it unsuitable for testing large batches of pipes. To address these issues, a medical pneumatic tube testing device is proposed that can achieve integrated testing of both straight and curved pipes, with a high degree of automation and ease of operation, thus overcoming the shortcomings of existing technologies. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a tube body testing device for medical pneumatic tube systems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A tube body testing device for medical pneumatic flow pipelines includes a frame with a first side frame, a second side frame, and a third side frame mounted on it. A straight tube is connected between the first and second side frames. A first and second conveying bases are also movably connected within the frame. A straight tube testing component is mounted on the first conveying base, and an arc tube testing component is mounted on the second conveying base. An arc frame is mounted on the third side frame, and an arc tube is placed on the arc frame. Both the straight and arc tubes are cut into half-tube shapes.

[0006] Preferably, the device frame is divided into a first test area and a second test area. Both test areas are equipped with lead screws and multiple guide rods. The first and second conveying bases are movably connected to the lead screws and guide rods. A drive motor is provided on one side of each lead screw, and the drive motor is installed on the outside of the device frame.

[0007] Preferably, there are two first side frames, which are symmetrically installed on the same side of the device frame. Each first side frame has two arc-shaped support ends symmetrically installed. Each arc-shaped support end has an embedded insertion groove on its outer side. One end of the straight pipe is connected to the insertion groove. Two second side frames are also provided, both installed on the same side of the device frame. The position of the second side frame corresponds to the position of the first side frame. Multiple arc-shaped support plates are installed on the second side frame. The other end of the straight pipe is placed on the arc-shaped support plate. A first cylinder is installed on each of the second side frames. An arc-shaped limiting plate is installed on the telescopic end of each first cylinder. The arc-shaped limiting plate is movably connected to the top surface of the arc-shaped support plate and contacts one side of the straight pipe.

[0008] Preferably, the straight pipe testing component includes a frame block, an elliptical wheel, a movable plate, a first fixed frame, and a contact probe. Two frame blocks are provided, vertically mounted on the top surface of the first conveying platform. Each frame block is equipped with multiple vertical rods. Two movable plates are provided, both ends of which are connected to the outer sides of the vertical rods. The movable plates and frame blocks are connected by a spring. A first rotating rod is horizontally installed between the inner walls of the two frame blocks. Multiple elliptical wheels are mounted on the first rotating rod, connecting the two movable plates. A first motor is installed at one end of the first rotating rod. Multiple first fixed frames are installed on the outer surfaces of both movable plates, adapting to the shape of the inner wall of the straight pipe. Multiple first contact rods are arranged in a ring within the first fixed frame. A contact probe is movably connected to the outer side of each first contact rod. One end of the contact probe is connected to the first fixed frame, and the other end is slidably connected to the straight pipe. Multiple pressure testing plates are installed on the first fixed frame, and the pressure testing plates are connected to the contact probes by a spring.

[0009] Preferably, there are two third side frames, which are installed on the same side of the device frame. Two arc-shaped frames are installed vertically between the two third side frames. A slide table is slidably connected to the second conveying base, and the arc tube detection component is rotatably connected to the top surface of the slide table.

[0010] Preferably, the arc tube detection component includes a steering frame, a lower frame plate, an upper frame plate, and a precision feeder. The steering frame is rotatably connected to the top surface of the slide table. Multiple sets of notches are symmetrically opened on both sides of the steering frame. Vertical rods are installed on the inner walls of each notch. The two ends of the upper and lower frame plates are slidably connected to the outside of the vertical rods. The upper and lower frame plates are connected to the notches by springs. Telescopic cylinders are provided on both ends of the upper and lower frame plates. The telescopic cylinders are installed on the outer surface of the steering frame.

[0011] Preferably, a second fixed frame is rotatably connected to the lower frame plate, and multiple limiting rods are arranged in a ring inside the second fixed frame. A second contact rod is connected to the outer side of each limiting rod. The outer end of the second contact rod is connected to the arc-shaped pipe. The second contact rod is spring-connected inside the second fixed frame, and a pressure detection plate is also provided on one side of the spring.

[0012] Preferably, an arc-shaped adapter is rotatably connected to the upper frame plate. The arc-shaped adapter is adapted to the size of the arc-shaped pipe. A cavity is provided in the middle of the arc-shaped adapter. An adjusting pipe is provided on the top surface of the arc-shaped adapter. A precision feeder is installed on the steering frame. A sand hopper is provided on the top surface of the precision feeder. A discharge pipe is provided on the bottom side of the precision feeder. The adjusting pipe is movably connected to the bottom side of the discharge pipe.

[0013] The beneficial effects of this invention are: This solution uses a first and second side frame to install straight pipes, and a third and an arc-shaped frame to hold arc-shaped pipes. A first conveyor platform carries the straight pipe testing component, and a second conveyor platform carries the arc-shaped pipe testing component. This allows for simultaneous or separate testing of straight and arc-shaped pipes, eliminating the need for multiple testing devices, effectively reducing equipment investment and testing space requirements. The continuous testing process significantly improves efficiency and is suitable for batch pipe testing needs. Furthermore, both straight and arc-shaped pipes utilize a semi-pipe cutting design, ensuring full contact between the testing component and the inner wall of the pipe, avoiding blind spots and enhancing the comprehensiveness of the testing.

[0014] The device frame is equipped with lead screws, guide rods, and drive motors in both the first and second test areas, which can automatically move the first and second conveyor platforms to achieve automatic feeding of the test pieces. The slide on the second conveyor platform can drive the arc pipe test piece to slide, and the steering frame can drive the arc pipe test piece to rotate, adapting to the testing needs of different positions of the arc pipe. The setting of the first cylinder and the telescopic cylinder can realize the automatic limit of the pipe and the automatic contact of the test piece. The entire testing process does not require frequent manual adjustments, which greatly reduces the intensity of manual labor, avoids the testing errors caused by human operation, and improves the stability and reliability of the testing.

[0015] This solution reduces the likelihood of difficulty in internal pipeline inspection after prolonged use of pneumatic material pipelines, decreases the need for extensive manual inspection during the inspection process, improves the effectiveness of automated inspection, and enables multi-functional inspection for different pipe types, thus enhancing the ease of operation of the device. The inspection process is more comparative and has better intuitiveness. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a tube body testing device for medical pneumatic tubes proposed in this invention; Figure 2 This is a schematic diagram of the main structure of a tube body testing device for medical pneumatic tubes proposed in this invention; Figure 3 This is a top view schematic diagram of a tube body testing device for medical pneumatic flow pipelines proposed in this invention; Figure 4 This is a structural schematic diagram of the device frame section; Figure 5 This is a structural schematic diagram of the straight pipe testing component; Figure 6 for Figure 5 A schematic diagram of the structure of part A; Figure 7 for Figure 5 Partial front view structural diagram; Figure 8 This is a structural schematic diagram of the arc-shaped detection component; Figure 9 This is a schematic diagram of the main structure of the arc-shaped detection component. Figure 10 This is a side view of the arc-shaped detection component. Figure 11 This is a structural diagram of the lower shelf and upper shelf sections; Figure 12 This is a schematic diagram of the main structure of the lower shelf and upper shelf sections.

[0017] In the diagram: 1. Device frame; 11. First conveying base; 12. Second conveying base; 121. Slide table; 13. First side frame; 131. Arc-shaped support end; 14. Second side frame; 141. First cylinder; 15. Third side frame; 16. Arc-shaped support plate; 17. Arc-shaped frame; 18. Lead screw; 2. Straight pipe; 21. Arc-shaped pipe; 3. Straight pipe detection piece; 31. Elliptical wheel; 32. First rotating rod; 33. Movable plate; 34. First fixed frame; 35. First motor; 36. First contact rod; 37. Contact probe; 4. Arc-shaped pipe detection piece; 41. Sand hopper; 42. Telescopic cylinder; 43. Precision feeder; 44. Lower frame plate; 441. Second fixed frame; 442. Second contact rod; 45. Upper frame plate; 451. Arc-shaped adapter frame; 452. Adjusting pipe. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Example 1: Refer to Figure 1-7 A tube body testing device for medical pneumatic tube systems includes a frame 1. A first side frame 13, a second side frame 14, and a third side frame 15 are mounted on the frame 1. A straight tube 2 is connected between the first side frame 13 and the second side frame 14. A first conveying platform 11 and a second conveying platform 12 are also movably connected within the frame 1. A straight tube testing component 3 is mounted on the first conveying platform 11, an arc tube testing component 4 is mounted on the second conveying platform 12, and an arc-shaped frame 15 is mounted on the third side frame 15. 7. An arc-shaped pipe 21 is placed on the arc-shaped frame 17. Both the straight pipe 2 and the arc-shaped pipe 21 are cut into half-pipe shapes. The device frame 1 is divided into a first test area and a second test area. Both test areas are equipped with lead screws 18 and multiple guide rods. The first conveying base 11 and the second conveying base 12 are movably connected to the lead screws 18 and guide rods to facilitate the back-and-forth movement of the straight pipe test piece 3 and the arc pipe test piece 4. A drive motor is provided on one side of the lead screw 18. The drive motor is installed on the outside of the device frame 1.

[0020] Specifically, there are two first side frames 13, which are symmetrically installed on the same side of the device frame 1. Two arc-shaped support ends 131 are symmetrically installed on each first side frame 13. An embedded insertion groove is opened on the outer end of each arc-shaped support end 131, and one end of the straight pipe 2 is connected to the insertion groove. Two second side frames 14 are also provided, both installed on the same side of the device frame 1. The position of the second side frame 14 corresponds to the position of the first side frame 13. Multiple arc-shaped support plates 16 are installed on the second side frame 14. The other end of the straight pipe 2 is placed on the arc-shaped support plate 16. A first cylinder 141 is installed on each of the second side frames 14. Arc-shaped limiting plates are installed on the telescopic ends of the first cylinder 141. The arc-shaped limiting plates are movably connected to the top surface of the arc-shaped support plate 16, and they contact one side of the straight pipe 2 to facilitate the installation of the straight pipe 2 and to resist it, so as to prevent the position of the straight pipe 2 from moving during the detection process.

[0021] In this embodiment, the straight pipe testing component 3 includes a frame block, an elliptical wheel 31, a movable plate 33, a first fixed frame 34, and a contact probe 37. Two frame blocks are provided, vertically mounted on the top surface of the first conveying base 11. Each frame block is equipped with multiple vertical rods. Two movable plates 33 are provided, with both ends connected to the outer sides of the vertical rods. The movable plates 33 and the frame blocks are connected by a spring to facilitate quick return of the movable plates 33 when not in use. A first rotating rod 32 is horizontally installed between the inner walls of the two frame blocks. Multiple elliptical wheels 31 are mounted on the first rotating rod 32, connecting the two movable plates 33 and acting to... Connected inside the straight pipe 2, a first motor 35 is installed at one end of the first rotating rod 32. Multiple first fixing brackets 34 are installed on the outer surfaces of the two movable plates 33. The shape of the first fixing brackets 34 is adapted to the inner wall of the straight pipe 2. Multiple first contact rods 36 are arranged in a ring inside the first fixing brackets 34. Contact probes 37 are movably connected to the outer side of each first contact rod 36. One end of the contact probe 37 is connected inside the first fixing bracket 34, and the other end is slidably connected inside the straight pipe 2. Multiple pressure detection plates are installed on the first fixing bracket 34. The smoothness of the inside can be distinguished according to the pressure of the spring. The pressure detection plates and the contact probes 37 are connected by a spring.

[0022] Working principle: When inspecting the straight pipe 2, a long-used straight pipe 2 and a brand-new straight pipe 2 can be symmetrically cut. One end is inserted into the arc-shaped support end 131, and the other end is placed on the arc-shaped support plate 16. Then, the first cylinder 141 is extended to limit the straight pipe 2. The lead screw 18 is then rotated to move the first conveying platform 11 forward a certain distance. The first motor 35 is then rotated. During the rotation, the elliptical wheel 31 will push the movable plates 33 on both sides outward until the contact probe 37 contacts the inner wall of the straight pipe 2. Then, the lead screw 18 is rotated again, and the first conveying platform... 11. Move to the other side. During the movement, the contact probe 37 will contact the inner wall of the straight pipe 2. During the movement, the spring will be squeezed due to friction. At this time, the value displayed by the pressure detection plate will begin to change. Since the straight pipe 2 has a smooth layer, only a small amount of friction will be generated, and the pressure value will change slightly. If it moves to the wear area, the smooth layer on the surface will be worn. At this time, the friction will change greatly, and the pressure value will increase significantly. When it moves to a large wear area and produces an internal depression, the contact probe 37 will lose contact with the straight pipe 2. At this time, the pressure value will return to the initial state, indicating that there is an internal depression area.

[0023] Example 2: Reference Figure 8-12 Based on Embodiment 1, the following technical solutions are also provided: Two third side frames 15 are also provided. The two third side frames 15 are installed on the same side of the device frame 1. Two arc-shaped frames 17 are installed vertically between the two third side frames 15. A slide table 121 is slidably connected on the second conveying base 12. The arc tube detection component 4 is rotatably connected to the top surface of the slide table 121.

[0024] The arc tube detection component 4 includes a steering frame, a lower frame plate 44, an upper frame plate 45, and a precision feeder 43. The steering frame is rotatably connected to the top surface of the slide table 121. Multiple sets of notches and slots are symmetrically opened on both sides of the steering frame. Vertical rods are installed on the inner walls of the notches and slots. The two ends of the upper frame plate 45 and the lower frame plate 44 are slidably connected to the outside of the vertical rods. The upper frame plate 45 and the lower frame plate 44 are connected to the notches and slots by springs. Telescopic cylinders 42 are provided on both ends of the upper frame plate 45 and the lower frame plate 44 to realize the vertical adjustment of the two. The telescopic cylinders 42 are installed on the outer surface of the steering frame.

[0025] A second fixed frame 441 is rotatably connected to the lower frame plate 44. Multiple limiting rods are arranged in a ring inside the second fixed frame 441. A second contact rod 442 is connected to the outer side of each limiting rod. The outer end of the second contact rod 442 is connected to the arc-shaped pipe 21. The second contact rod 442 is spring-connected inside the second fixed frame 441. A pressure detection plate is also provided on one side of the spring.

[0026] An arc-shaped adapter 451 is rotatably connected to the upper plate 45. The arc-shaped adapter 451 is adapted to the size of the arc-shaped pipe 21. A cavity is provided in the middle of the arc-shaped adapter 451. An adjusting pipe 452 is provided on the top surface of the arc-shaped adapter 451. A precision feeder 43 is installed on the steering frame. A sand hopper 41 is provided on the top surface of the precision feeder 43. A feeding pipe is provided on the bottom side of the precision feeder 43. The adjusting pipe 452 is movably connected to the bottom side of the feeding pipe.

[0027] Working principle: The curved pipe 21 is cut in half lengthwise, and then placed in the bottom curved frame 17. The telescopic cylinder 42 is controlled to extend downwards, at which point the lower frame plate 44 moves downwards until the second fixed frame 441 moves to the designated position. At this point, the second contact rod 442 contacts the inner wall of the curved pipe 21. The second conveying platform 12 is then moved, and the second fixed frame 441 moves along the curved pipe 21. The second contact rod 442 works in tandem with the contact probe 37 to complete the inner wall inspection of the curved pipe 21. After inspection, it can be placed in the upper curved frame 17, and then the upper frame plate 45 is moved to ensure a tight fit between the curved adapter frame 451 and the pipe. The fitting is inserted into the arc-shaped pipe 21. At this time, the regulating pipe 452 will extend along the feeding pipe, and the precision feeder 43 will feed in the fine sand. The fine sand will fall into the cavity, filling the cavity between the arc-shaped adapter 451 and the arc-shaped pipe 21. Then, the second conveying platform 12 is controlled to move forward again, and the arc-shaped adapter 451 will move along the arc-shaped pipe 21. During the movement, the fine sand will fill the worn and defective areas. Then, the arc-shaped adapter 451 will scrape away the remaining fine sand. Finally, the remaining fine sand is weighed and compared with the fine sand that was filled in, or the weight of the arc-shaped pipe 21 at this time is weighed and compared with the weight before the test to analyze the specific situation of the defect.

[0028] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0029] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A tube body testing device for medical pneumatic logistics pipelines, characterized in that, include: The device frame (1) is equipped with a first side frame (13), a second side frame (14) and a third side frame (15). A straight pipe (2) is connected between the first side frame (13) and the second side frame (14). A first conveying base (11) and a second conveying base (12) are also movably connected inside the device frame (1). A straight pipe detection piece (3) is installed on the first conveying base (11). An arc pipe detection piece (4) is installed on the second conveying base (12). An arc frame (17) is installed on the third side frame (15). An arc pipe (21) is placed on the arc frame (17). Both the straight pipe (2) and the arc pipe (21) are cut into half-pipe shapes.

2. The tube body testing device for medical pneumatic logistics pipelines according to claim 1, characterized in that, The device frame (1) is divided into a first test area and a second test area. Both test areas are equipped with lead screws (18) and multiple guide rods. The first conveying base (11) and the second conveying base (12) are movably connected to the lead screws (18) and the guide rods. A drive motor is provided on one side of the lead screws (18), and the drive motor is installed on the outside of the device frame (1).

3. The tube body testing device for medical pneumatic logistics pipelines according to claim 1, characterized in that, There are two first side frames (13), and the two first side frames (13) are symmetrically installed on the same side of the device frame (1). Two arc-shaped support ends (131) are symmetrically installed on each of the first side frames (13). An embedded insertion groove is opened on the outer end of each arc-shaped support end (131), and one end of the straight pipe (2) is connected to the insertion groove. Two second side frames (14) are also provided, both installed on the same side of the device frame (1). The position of the second side frame (14) corresponds to the position of the first side frame (13). Multiple arc-shaped support plates (16) are installed on the second side frame (14). The other end of the straight pipe (2) is placed on the arc-shaped support plate (16). A first cylinder (141) is installed on each of the second side frames (14). Arc-shaped limiting plates are installed on the telescopic end of the first cylinder (141). The arc-shaped limiting plates are movably connected to the top surface of the arc-shaped support plate (16) and contact one side of the straight pipe (2).

4. The tube body testing device for medical pneumatic logistics pipelines according to claim 1, characterized in that, The straight pipe testing component (3) includes a frame block, an elliptical rotating wheel (31), a movable plate (33), a first fixed frame (34), and a contact probe (37). Two frame blocks are provided, vertically mounted on the top surface of the first conveying base (11). Each frame block is equipped with multiple vertical rods. Two movable plates (33) are provided, with both ends connected to the outer sides of the vertical rods. The movable plates (33) and the frame blocks are connected by a spring. A first rotating rod (32) is horizontally installed between the inner walls of the two frame blocks. Multiple elliptical rotating wheels (31) are mounted on the first rotating rod (32), and these elliptical rotating wheels (31) are connected between the two movable plates (33). A first motor (35) is installed at one end of the first rotating rod (32). Multiple first fixing frames (34) are installed on the outer surfaces of the two movable plates (33). The shape of the first fixing frame (34) is adapted to the inner wall of the straight pipe (2). Multiple first contact rods (36) are arranged in a ring inside the first fixing frame (34). Contact probes (37) are movably connected to the outer sides of the first contact rods (36). One end of the contact probe (37) is connected inside the first fixing frame (34), and the other end is slidably connected inside the straight pipe (2). Multiple pressure detection plates are installed on the first fixing frame (34). The pressure detection plates and the contact probes (37) are connected by a spring.

5. The tube body testing device for medical pneumatic logistics pipelines according to claim 1, characterized in that, Two third side frames (15) are also provided. The two third side frames (15) are installed on the same side of the device frame (1). Two arc-shaped frames (17) are installed vertically between the two third side frames (15). A slide table (121) is slidably connected on the second conveying base (12). The arc tube detection component (4) is rotatably connected to the top surface of the slide table (121).

6. The tube body testing device for medical pneumatic logistics pipelines according to claim 5, characterized in that, The arc tube detection component (4) includes a steering frame, a lower frame plate (44), an upper frame plate (45), and a precision feeder (43). The steering frame is rotatably connected to the top surface of the slide table (121). Multiple sets of notches and slots are symmetrically opened on both sides of the steering frame. Vertical rods are installed on the inner walls of the notches and slots. The two ends of the upper frame plate (45) and the lower frame plate (44) are slidably connected to the outside of the vertical rods. The upper frame plate (45) and the lower frame plate (44) are connected to the notches and slots by springs. Telescopic cylinders (42) are provided on both ends of the upper frame plate (45) and the lower frame plate (44). The telescopic cylinders (42) are installed on the outer surface of the steering frame.

7. The tube body testing device for medical pneumatic logistics pipelines according to claim 6, characterized in that, The lower frame plate (44) is rotatably connected to a second fixed frame (441). Multiple limiting rods are arranged in a ring inside the second fixed frame (441). A second contact rod (442) is connected to the outer side of each limiting rod. The outer end of the second contact rod (442) is connected to the arc-shaped pipe (21). The second contact rod (442) is spring-connected inside the second fixed frame (441). A pressure detection plate is also provided on one side of the spring.

8. A tube body testing device for medical pneumatic logistics pipelines according to claim 8, characterized in that, An arc-shaped adapter (451) is rotatably connected to the upper frame plate (45). The arc-shaped adapter (451) is adapted to the size of the arc-shaped pipe (21). A cavity is provided in the middle of the arc-shaped adapter (451). An adjusting pipe (452) is provided on the top surface of the arc-shaped adapter (451). A precision feeder (43) is installed on the steering frame. A sand hopper (41) is provided on the top surface of the precision feeder (43). A feeding pipe is provided on the bottom side of the precision feeder (43). The adjusting pipe (452) is movably connected to the bottom side of the feeding pipe.

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