A grinding device and system for the inner wall of cast iron pipes

Abstract

This invention discloses a grinding device and system for the inner wall of cast iron pipes, relating to the technical field of grinding equipment. The grinding system for the inner wall of cast iron pipes includes a frame, a rotating support device, and a grinding device. The grinding device includes a grinding feed mechanism, an anti-sway mechanism, and a grinding mechanism. The grinding feed mechanism includes a first linear drive device, a first rotary power source, an outer fixed sleeve, and an inner rotating shaft. The anti-sway mechanism includes an outer rotating sleeve, a positioning wheel assembly, and a spacing adjustment mechanism. The grinding mechanism includes a second linear drive device and a grinding wheel body. The positioning wheel assembly provides radial support to the outer fixed sleeve, suppressing the radial sway of the grinding wheel shaft and improving grinding stability. The spacing adjustment mechanism can dynamically adjust the spacing of the positioning wheel assembly to adapt to cast iron pipes of different diameters. The second linear drive device drives the grinding wheel to move radially, and in conjunction with a pressure detection device, constant pressure grinding is achieved. By dynamically adjusting the grinding rhythm, the grinding effect and grinding consistency can be improved.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment technology, and in particular to a grinding device and system for the inner wall of cast pipes. Background Technology

[0002] In the production process of centrifugal cast pipes, the inner wall needs to be ground. Traditional grinding devices use a motor to drive a flexible shaft, with the front of the shaft driving a grinding head to grind and clean the inner wall of the pipe. Referring to patent CN201950537U, which discloses a grinding device for the inner wall of cast pipes, it has the following problems: 1. Because it uses the weight of the grinding shaft and frame to create grinding pressure on the cast pipe, when there are burrs, protrusions, or other defects on the inner surface, the grinding wheel shaft will float up and down with the undulations of the inner surface, producing irregular disturbances and bounces. The bounces become more pronounced the deeper into the pipe, resulting in an insufficiently smooth inner wall and poor inner diameter accuracy after grinding; 2. The more times the grinding head grinds, the more severe the wear. When the wear reaches a certain level, it may become too small to effectively contact the inner wall of the cast pipe, affecting the grinding accuracy and stability.

[0003] Patent CN221474502U discloses a grinding machine for the inner wall of cast iron pipes. The grinding unit's grinding rod includes an inner shaft and an outer sleeve. The inner shaft comprises a steel shaft and a flexible shaft, with a grinding wheel fitted onto the outer end of the flexible shaft. The outer sleeve includes a steel shaft outer sleeve fitted over the steel shaft and a flexible shaft outer sleeve fitted over the flexible shaft. In use, the inner shaft rotates while the outer sleeve remains fixed, and the flexible shaft operates inside the cast iron pipe for grinding, reducing overall vibration of the grinding rod and improving grinding quality. However, for grinding long cast iron pipes, such as 6m pipes, a longer grinding rod is required. When penetrating deeper into the pipe, the distal end of the grinding rod, due to its distance from the support point, still experiences significant swaying, resulting in a significantly inferior grinding effect at deeper parts of the pipe compared to shallower parts, affecting overall quality consistency. Summary of the Invention

[0004] Therefore, it is necessary to provide a grinding device and system for the inner wall of cast pipe to address the problems of unstable grinding pressure, grinding rod oscillation and wear compensation in the existing technology, thereby improving the accuracy, uniformity and stability of grinding the inner wall of cast pipe.

[0005] To achieve the above objectives, the present invention provides a grinding device for the inner wall of cast pipe, including a grinding feed mechanism, an anti-sway mechanism, and a grinding mechanism.

[0006] The grinding feed mechanism includes a first linear drive device, a first rotary power source, an outer fixed sleeve, and an inner rotating shaft. The first linear drive device has a movable end that can move linearly along the axial direction of the cast pipe. The first rotary power source is installed on the movable end. The outer fixed sleeve is fixedly installed on the movable end. The inner rotating shaft is rotatably installed inside the outer fixed sleeve and is driven to rotate by the first rotary power source.

[0007] The anti-sway mechanism includes an outer rotating sleeve, a positioning wheel assembly, and a spacing adjustment mechanism. The outer rotating sleeve is rotatably mounted on the outer fixed sleeve. The positioning wheel assembly is circumferentially distributed around the outer rotating sleeve. The spacing adjustment mechanism is mounted on the outer rotating sleeve. The positioning wheel assembly adjusts the spacing with the outer rotating sleeve through the spacing adjustment mechanism. The positioning wheel assembly includes a positioning wheel body for contacting and engaging with the inner wall of the cast pipe.

[0008] The grinding mechanism includes a second linear drive device and a grinding wheel body. The grinding wheel body is connected to the inner rotating shaft for transmission. The second linear drive device is fixedly connected to the outer fixed sleeve. The second linear drive device drives the grinding wheel body to move radially along the inner rotating shaft so that the grinding wheel body approaches or moves away from the inner wall of the cast pipe. The pressure detection device detects the pressure between the grinding wheel body and the inner wall of the cast pipe.

[0009] As a preferred embodiment of the present invention, the positioning wheel assembly includes a positioning wheel body for contacting and engaging with the inner wall of the cast pipe and a positioning wheel frame rotatably connected to the positioning wheel body; the spacing adjustment mechanism includes a shaft seat, a double-rotating screw, and a moving assembly, the moving assembly being symmetrically arranged on both sides of the positioning wheel assembly, the moving assembly including a guide rail, a telescopic rod, a connecting piece, a synchronous ring plate, and a nut seat; the guide rail is fixedly mounted on the outer rotating sleeve; one end of the telescopic rod is fixedly connected to the outer rotating sleeve, and the other end is fixedly connected to the positioning wheel frame; the synchronous ring plate is fixedly connected to the slider of the guide rail; the connecting piece corresponds one-to-one with the positioning wheel assembly and is circumferentially distributed around the outer rotating sleeve, one end of the connecting piece is hinged to the synchronous ring plate, and the other end is hinged to the positioning wheel frame; the nut seat is fixedly mounted on the synchronous ring plate; the double-rotating screw is threadedly connected to the nut seat, the shaft seat is fixedly mounted on the outer rotating sleeve, and the double-rotating screw is rotatably connected to the shaft seat; by rotating the double-rotating screw, the two nut seats can be driven to move towards each other or away from each other.

[0010] As a preferred embodiment of the present invention, the spacing adjustment mechanism further includes a handle, which is mounted on a double-rotating lead screw.

[0011] As a preferred embodiment of the present invention, the grinding mechanism further includes an adjusting seat, an elastic device, a grinding wheel housing, and a grinding wheel shaft. The grinding wheel body is fixedly mounted on the grinding wheel shaft, the grinding wheel shaft is rotatably connected to the grinding wheel body housing, and the grinding wheel shaft is drively connected to the inner rotating shaft. The adjusting seat is mounted on the output end of the second linear drive device, and the pressure detection device is mounted on the adjusting seat. The detection end of the pressure detection device is connected to the grinding wheel housing through the elastic device.

[0012] As a preferred embodiment of the present invention, the grinding mechanism further includes a tensioning transmission assembly, which includes a driving pulley, a driven pulley, a tensioning pulley, a tensioning shaft, a guide rod, a guide seat, and an elastic element. The guide rod is disposed on both sides of the tensioning pulley and is detachably fixed to the outer fixed sleeve. The guide seat is slidably mounted on the guide rod. Both ends of the tensioning shaft are respectively connected to the two guide seats. The tensioning pulley is rotatably mounted on the tensioning shaft. A limit ring is fixed on the guide rod. One end of the elastic element is connected to the limit ring, and the other end is connected to the guide seat. The driving pulley is mounted on the inner rotating shaft, and the driven pulley is mounted on the grinding wheel shaft. The driving pulley, the driven pulley, and the tensioning pulley are connected by a tensioning transmission belt.

[0013] As a preferred embodiment of the present invention, the outer fixed sleeve includes a long cylindrical body, a narrow-diameter cylindrical body, and a transmission housing connected in sequence. The outer diameter of the narrow-diameter cylindrical body is smaller than the outer diameter of the long cylindrical body. The outer rotating sleeve is rotatably mounted on the narrow-diameter cylindrical body. The second linear drive device is mounted on the transmission housing. The transmission housing has a first opening. The grinding wheel housing is slidably connected to the first opening. The transmission housing and the grinding wheel housing together form a protective cavity. The driving pulley, the driven pulley, the tensioning pulley, and the tensioning transmission belt are all located inside the protective cavity.

[0014] As a preferred embodiment of the present invention, the grinding mechanism further includes a wear detection device, which is installed on the outer shell of the grinding wheel and is used to detect whether the outer diameter of the grinding wheel body is worn to a preset value.

[0015] As a preferred embodiment of the present invention, it also includes a roller support mechanism. The wear detection device includes a roller support frame and an axial roller support. The axial roller support is rotatably mounted on the roller support frame. A V-shaped annular groove adapted to the outer fixed sleeve is provided on the axial roller support. The outer fixed sleeve is in rolling connection with the axial roller support.

[0016] On the other hand, the present invention provides a grinding system for the inner wall of cast pipe, including a frame, a rotating support device and the aforementioned grinding device for the inner wall of cast pipe. The rotating support device is provided in at least two parts, and the rotating support device includes an active radial support roller, a driven radial support roller and a second rotational power source. The active radial support roller and the driven radial support roller are both rotatably connected to the frame. The second rotational power source drives the active radial support roller to rotate, and a limiting space for accommodating the cast pipe is formed between the active radial support roller and the driven radial support roller.

[0017] As a preferred embodiment of the present invention, a pressing mechanism is also provided. The pressing mechanism includes a third linear drive device, a pressure roller frame, and a pressing roller. The third linear drive device is mounted on the frame, and the pressure roller frame is mounted on the output end of the third linear drive device. The pressing roller is rotatably mounted on the pressure roller frame and is used for rolling connection with the top end of the casting pipe.

[0018] Compared with existing technologies, this technical solution has at least one of the following beneficial effects:

[0019] 1. By setting up a circumferentially distributed positioning wheel assembly that contacts the inner wall of the cast pipe, radial support can be formed on the outer fixed sleeve, suppressing the radial sway of the outer fixed sleeve and the inner rotating shaft. Since the distance between the grinding wheel body and the positioning wheel body is relatively short, the radial sway of the grinding wheel shaft can also be effectively limited, thereby improving grinding stability.

[0020] 2. The spacing adjustment mechanism can dynamically adjust the spacing of the positioning wheel assembly to adapt to different diameter cast pipes;

[0021] 3. The grinding wheel is driven to move radially by the second linear drive device, and constant pressure grinding is achieved in conjunction with the pressure detection device to improve the processing accuracy of the inner wall of the cast pipe. The second linear drive device is linked with the first linear drive device and can dynamically adjust the grinding rhythm according to the pressure change detected by the pressure detection device to improve the grinding effect and grinding consistency. Attached Figure Description

[0022] Figure 1 This is a perspective view of a pipe inner wall grinding system according to an embodiment of the present invention;

[0023] Figure 2 This is a side view of a pipe inner wall grinding system according to an embodiment of the present invention;

[0024] Figure 3 This is a perspective view of a pipe inner wall grinding device according to an embodiment of the present invention;

[0025] Figure 4 This is a side view of a pipe inner wall grinding system according to an embodiment of the present invention;

[0026] Figure 5 for Figure 4 A cross-sectional view along the CC line;

[0027] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0028] Figure 7 This is an exploded view of the grinding mechanism and transmission housing according to an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the anti-sway mechanism according to an embodiment of the present invention;

[0030] Figure 9 This is a cross-sectional view of the grinding mechanism according to an embodiment of the present invention;

[0031] In the figure, 100 is the grinding feed mechanism; 110 is the first linear drive device; 111 is the moving end; 120 is the first rotary power source; 130 is the outer fixed sleeve; 131 is the long cylinder; 132 is the narrow-diameter cylinder; 133 is the transmission housing; 1331 is the first opening; 1332 is the slide groove; and 140 is the inner rotating shaft.

[0032] 200. Anti-sway mechanism; 210. Outer rotating sleeve; 220. Positioning wheel assembly; 221. Positioning wheel body; 222. Positioning wheel frame; 230. Spacing adjustment mechanism; 231. Shaft seat; 232. Double-rotating lead screw; 233. Handle; 234. Moving assembly; 2341. Guide rail; 2342. Telescopic rod; 2343. Connector; 2344. Synchronous ring plate; 2345. Nut seat; 300. Grinding mechanism; 310. Second linear drive device; 320. Pressure detection device; 330. Grinding wheel body; 340. Adjusting seat; 350. Elastic device; 360. Grinding wheel housing; 370. Grinding wheel shaft; 380. Tensioner Transmission components; 381, driving pulley; 382, ​​driven pulley; 383, tensioning pulley; 384, tensioning shaft; 385, guide rod; 386, guide seat; 387, elastic element; 388, tensioning transmission belt; 390, wear detection device; 400, roller support mechanism; 410, roller support frame; 420, axial roller support; 421, V-shaped annular groove; 500, frame; 600, rotating support device; 610, driving radial roller support; 620, driven radial roller support; 630, second rotary power source; 700, pressing mechanism; 710, third linear drive device; 720, pressure roller frame; 730, pressing roller; 800, cast pipe. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Please see Figures 1 to 9This application provides a system for grinding the inner wall of a cast pipe, including a frame 500, a rotating support device 600, a cast pipe inner wall grinding device, and a controller. Two rotating support devices 600 are provided, each including an active radial support roller 610, a driven radial support roller 620, and a second rotating power source 630. The active radial support roller 610 and the driven radial support roller 620 are rotatably connected to the frame 500 through bearings. The second rotating power source 630 is fixedly installed on the frame 500 and drives the active radial support roller 610 to rotate. A limiting space for accommodating the cast pipe 800 is formed between the active radial support roller 610 and the driven radial support roller 620.

[0035] When grinding the cast pipe 800, the cast pipe 800 is placed in the limiting space formed by the active radial support roller 610 and the driven radial support roller 620. The active radial support roller 610 and the driven support roller cooperate to form a radial limit on the cast pipe 800.

[0036] The second rotary power source 630 is a geared motor and is electrically connected to the controller. The second rotary power source 630 drives the active radial support roller 610 to rotate through the belt drive assembly. The active radial support roller 610 drives the casting pipe 800 to rotate through friction and rotates together with the casting pipe 800 due to the friction between the roller and the casting pipe 800.

[0037] In some embodiments, please refer to Figure 2 A pressing mechanism 700 can also be provided, which includes a third linear drive device 710, a pressure roller frame 720, and a pressing roller 730. The third linear drive device 710 is mounted on the frame 500 and can be a cylinder or an electric push rod. The pressure roller frame 720 is installed at the output end of the third linear drive device 710, and the pressing roller 730 is rotatably mounted on the pressure roller frame 720. The pressing roller 730 is used to roll into contact with the top end of the casting pipe 800. After the pressing roller 730 descends, it rolls into contact with the top end of the casting pipe 800, which is used to prevent the casting pipe 800 from disengaging from the active radial support roller 610 and the driven radial support roller 620. The third linear drive device 710 applies a certain pressure to the pressing roller 730, so that there is a certain friction between the pressing roller 730 and the casting pipe 800, which can restrict the axial movement of the casting pipe 800 and only allow the casting pipe 800 to rotate. The downward pressure roller 730 provides axial positioning for the shaft of the casting pipe 800 and can also counteract the thrust of the grinding roller on the casting pipe 800, thereby improving the stability of the casting pipe 800.

[0038] In this embodiment, the grinding device for the inner wall of the cast pipe includes a grinding feed mechanism 100, an anti-sway mechanism 200, and a grinding mechanism 300.

[0039] The grinding feed mechanism 100 includes a first linear drive device 110, a first rotary power source 120, an outer fixed sleeve 130, and an inner rotating shaft 140. The first linear drive device 110 has a moving end 111 that can move linearly along the axial direction of the casting pipe 800. The first rotary power source 120 is mounted on the moving end 111, the outer fixed sleeve 130 is fixedly mounted on the moving end 111, and the inner rotating shaft 140 is rotatably mounted in the outer fixed sleeve 130 through a bearing and is driven to rotate by the first rotary power source 120.

[0040] In this embodiment, the first linear drive device 110 uses a conventional ground rail, which can achieve long-distance linear movement of the load. Specifically, it can be a rack and pinion type ground rail or a roller guide type ground rail. For example, if a rack and pinion type ground rail is used, it consists of a track, a slider, a drive motor, a rack, and gears. The slider is slidably mounted on the track, the drive motor is fixedly mounted on the slider, the gear is fixedly mounted on the rotor of the drive motor, and the rack is fixedly mounted on the track. The rack meshes with the gear, and the drive motor drives the gear to rotate, causing the slider, drive motor, and gear to move linearly along the length of the track. The drive motor consists of an AC servo motor and a reduction gear, enabling precise linear movement. In other embodiments, the first linear drive device 110 can also use a linear slide or other conventional devices capable of linear motion.

[0041] In this embodiment, the first rotary power source 120 is an electric motor, but a pneumatic motor or a hydraulic motor can also be used. The first rotary power source 120 drives the inner rotating shaft 140 to rotate via a belt drive assembly. Both the first rotary power source 120 and the first linear drive device 110 are controlled by a controller.

[0042] The anti-sway mechanism 200 includes an outer rotating sleeve 210, a positioning wheel assembly 220, and a spacing adjustment mechanism 230. The outer rotating sleeve 210 is rotatably mounted on the outer fixed sleeve 130 via bearings. The positioning wheel assembly 220 is circumferentially distributed around the outer rotating sleeve 210. The spacing adjustment mechanism 230 is mounted on the outer rotating sleeve 210. The spacing adjustment mechanism 230 adjusts the spacing between the positioning wheel assembly 220 and the outer rotating sleeve 210. The positioning wheel assembly 220 includes a positioning wheel body 221 for contacting and engaging with the inner wall of the casting pipe 800 and a positioning wheel frame 222 rotatably connected to the positioning wheel body 221.

[0043] In this embodiment, specifically, three positioning wheel assemblies 220 are provided, evenly distributed circumferentially around the outer rotating sleeve 210 along its axis. The positioning wheels contact the inner wall of the casting pipe 800 to form multi-point support, suppressing the radial sway of the outer fixed sleeve 130 and the inner rotating shaft 140. Since the distance between the grinding wheel body 330 and the positioning wheel body 221 is relatively short, the multi-point support formed by the positioning wheel assembly 220 contacting the inner wall of the casting pipe 800 can also effectively limit the radial sway of the grinding wheel shaft 370, thereby improving grinding stability.

[0044] In this embodiment, please refer to Figure 6 and Figure 8 The spacing adjustment mechanism 230 includes a bearing seat 231, a double-rotating lead screw 232, and a moving assembly 234. The moving assembly 234 is symmetrically arranged on both sides of the positioning wheel assembly 220. The moving assembly 234 includes a guide rail 2341, a telescopic rod 2342, a connecting piece 2343, a synchronous ring plate 2344, and a nut seat 2345. The guide rail 2341 is fixedly installed on the outer rotating sleeve 210. One end of the telescopic rod 2342 is fixedly connected to the outer rotating sleeve 210, and the other end is fixedly connected to the positioning wheel frame 222. The synchronous ring plate 2342 is fixedly connected to the positioning wheel frame 222. 44 is fixedly connected to the slider of the guide rail 2341; the connecting piece 2343 corresponds one-to-one with the positioning wheel assembly 220 and is distributed circumferentially around the outer rotating sleeve 210. One end of the connecting piece 2343 is hinged to the synchronous ring plate 2344, and the other end is hinged to the positioning wheel frame 222; the nut seat 2345 is fixedly installed on the synchronous ring plate 2344; the double-rotating screw 232 is threadedly connected to the nut seat 2345, and the shaft seat 231 is fixedly installed on the outer rotating sleeve 210. The double-rotating screw 232 is rotatably connected to the shaft seat 231.

[0045] The double-helix screw 232 has two external thread sections with opposite directions of rotation, and two nut seats 2345 are threadedly connected to the two external thread sections with opposite directions of rotation, respectively. By rotating the double-helix screw 232, the two nut seats 2345 can be driven to move towards or away from each other, which in turn drives the three connecting parts 2343 to move synchronously through the synchronous ring plate 2344. Since the connecting parts 2343 of the two moving components 234 are all moving, under the guidance of the telescopic rod 2342, the positioning wheel assemblies 220 move synchronously, approaching or moving away from the inner wall of the cast pipe 800, and are suitable for various cast pipes 800 with different diameters.

[0046] In this embodiment, the connector 2343 is configured as a telescopic spring rod, providing flexible support. By pre-adjusting the positioning wheel body 221 to a suitable position, such that the outer diameter of the positioning wheel body 221 is slightly larger than the inner diameter of the casting pipe 800, the positioning wheel body 221 will abut against the end of the casting pipe 800 when entering the casting pipe 800. Through the deformation and compression of the spring rod, the positioning wheel body 221 smoothly enters the casting pipe 800 and abuts against the inner wall of the casting pipe 800. The spring rod is configured with a large elastic force, sufficient to support the outer fixing sleeve 130 and ensure the coaxiality of the outer fixing sleeve 130 and the casting pipe 800.

[0047] In other embodiments, the connector 2343 can also be configured as a rigid link, and the positioning wheel body 221 is selected as a roller with an elastic outer ring, such as a roller with a polyurethane outer ring. The positioning wheel body 221 is pre-adjusted to a suitable position so that the outer diameter of the positioning wheel body 221 is slightly larger than the inner diameter of the casting pipe 800. In this way, when entering the casting pipe 800, the positioning wheel body 221 will abut against the port of the casting pipe 800. Through the deformation of the elastic outer ring, the positioning wheel body 221 can smoothly enter the casting pipe 800 and abut against the inner wall of the casting pipe 800.

[0048] In this embodiment, the inner wall grinding device of the cast pipe inner wall grinding system is symmetrically configured as two. During operation, the grinding wheel bodies 330 of the two grinding wheel bodies move towards each other to grind the inner wall of the cast pipe 800. Before the two grinding wheel bodies 330 collide, one grinding wheel body 330 moves backward to make room for the other grinding wheel body 330, while the other grinding wheel body 330 moves forward, thereby grinding the area of ​​the cast pipe 800 located at the minimum distance between the two grinding wheel bodies 330.

[0049] In some embodiments, to facilitate the rotation of the dual-direction lead screw 232, the pitch adjustment mechanism 230 further includes a handle 233, which is mounted on the dual-direction lead screw 232. By rotating the handle 233, the dual-direction lead screw 232 can be easily rotated.

[0050] In this embodiment, please refer to Figure 7 and Figure 9The grinding mechanism 300 includes a second linear drive device 310, a grinding wheel body 330, an adjusting seat 340, a pressure detection device 320, an elastic device 350, a grinding wheel housing 360, a grinding wheel shaft 370, and a tension transmission assembly 380. The tension transmission assembly 380 includes a driving pulley 381, a driven pulley 382, ​​a tensioning pulley 383, a tensioning shaft 384, a guide rod 385, a guide seat 386, and an elastic element 387. The grinding wheel body 330 is connected to the inner rotating shaft 140 for transmission. The second linear drive device 310 is fixedly connected to the outer fixed sleeve 130. The second linear drive device 310 drives the grinding wheel body 330 to move radially along the inner rotating shaft 140 so that the grinding wheel body 330 approaches or moves away from the inner wall of the cast pipe 800, quickly adapting to various cast pipes 800 with different diameters, and ensuring stable contact between the positioning wheel and the inner wall of the cast pipe 800 with various cast pipes 800 with different diameters.

[0051] The grinding wheel body 330 is fixedly mounted on the grinding wheel shaft 370. The grinding wheel shaft 370 is rotatably connected to the outer shell of the grinding wheel body 330. The grinding wheel shaft 370 is drive-connected to the inner rotating shaft 140. The adjusting seat 340 is mounted on the output end of the second linear drive device 310. The pressure detection device 320 is mounted on the adjusting seat 340. The detection end of the pressure detection device 320 is connected to the grinding wheel outer shell 360 through the elastic device 350.

[0052] The second linear drive device 310 is an electric slide, the pressure detection device 320 is a pressure sensor, and the elastic device 350 is a spring damping seat or an elastic pad. Both the second linear drive device 310 and the pressure detection device 320 are electrically connected to the controller. The controller receives the signal fed back by the pressure detection device 320 and controls the operation of the second linear drive device 310.

[0053] In this embodiment, after the grinding wheel body 330 smoothly enters the interior of the casting pipe 800, the second linear drive device 310 drives the grinding wheel body 330 to approach the inner wall of the casting pipe 800, so that the grinding wheel body 330 abuts against the inner wall of the casting pipe 800, and the elastic device 350 is in a deformed and compressed state, so that the grinding wheel body 330 and the inner wall of the casting pipe 800 are in a flexible contact state, and the pressure of the grinding wheel body 330 abutting against the inner wall of the casting pipe 800 is set within a preset value range.

[0054] When there are burrs, protrusions, or other defects on the inner wall of the cast pipe 800, the grinding wheel will move up and down with the undulations of the inner wall. The pressure detection device 320 monitors the pressure between the grinding wheel body 330 and the inner wall of the cast pipe 800 in real time. When the pressure detection device 320 detects an increase in pressure value exceeding a preset range, it may be because the grinding wheel has moved to the location of burrs, protrusions, or other defects on the inner wall of the cast pipe 800. To improve the grinding effect, when the pressure value increases, the first linear drive device 110 pauses or slows down its movement, increasing the grinding time of the grinding wheel at the location of burrs, protrusions, or other defects on the inner wall of the cast pipe 800, thereby fully grinding the burrs, protrusions, and other defects and improving the consistency of the grinding quality of the inner wall of the cast pipe 800. When the pressure value decreases and falls within the preset range, the first linear drive device 110 continues to feed the area grinding mechanism 300 deeper into the cast pipe 800.

[0055] In this embodiment, the guide rod 385 is disposed on both sides of the tensioning pulley 383. The guide rod 385 is detachably and fixedly connected to the outer fixing sleeve 130. Specifically, the guide rod 385 has pin holes at both ends, and the outer fixing sleeve 130 has an opening for the guide rod 385 to pass through. After the guide rod 385 passes through the opening, a cotter pin is installed in it. The cotter pin restricts the axial movement of the guide rod 385, and the opening restricts the radial movement of the guide rod 385, thereby making the guide rod 385 detachably and fixedly connected to the outer fixing sleeve 130.

[0056] Guide seat 386 is slidably mounted on guide rod 385. Tensioning shaft 384 is connected to two guide seats 386 at both ends. Tensioning shaft 384 is connected to guide seat 386 by set screw. Tensioning pulley 383 is rotatably mounted on tensioning shaft 384 by bearing. Limit ring is fixed on guide rod 385. One end of elastic element 387 is connected to limit ring, and the other end is connected to guide seat 386. Drive pulley 381 is mounted on inner rotating shaft 140. Driven pulley 382 is mounted on grinding wheel shaft 370. Drive pulley 381, driven pulley 382, ​​and tensioning pulley 383 are connected by tension transmission belt 388.

[0057] In this embodiment, the elastic element 387 is a spring, which is fitted onto the guide rod 385. When the second linear drive device 310 drives the grinding wheel body 330 to approach the inner wall of the casting pipe 800, the driven pulley 382 will move away from the driving pulley 381, and the tension transmission belt 388 will pull the tension pulley 383 to move. The tension pulley 383 drives the tension shaft 384 and the guide seat 386 to move. The guide seat 386 moves on the guide rod 385 and squeezes the elastic element 387, causing the elastic element 387 to compress and deform.

[0058] When the second linear drive device 310 drives the grinding wheel body 330 away from the inner wall of the casting pipe 800, under the action of the elastic restoring force of the elastic element 387, the elastic element 387 pushes the guide seat 386, tension shaft 384, and tension pulley 383 to move, automatically compensating for the belt slack caused by the change in the position of the grinding wheel, so that the driving pulley 381 and the driven pulley 382 maintain a stable transmission connection.

[0059] To limit the range of motion of the guide seat 386, a groove 1332 is provided on the inner wall of the outer fixed sleeve 130. The guide seat 386 is slidably connected to the groove 1332. The groove 1332 can guide the guide seat 386 simultaneously with the guide rod 385, and can also limit the range of motion of the guide seat 386 to prevent the tension pulley 383 from contacting the inner wall of the outer fixed sleeve 130, or from contacting the driving pulley 381 or the driven pulley 382.

[0060] In some embodiments, please refer to Figure 6 Since the anti-sway mechanism 200 requires a certain amount of space, to reduce the space occupied by the anti-sway mechanism 200, an outer fixing sleeve 130 is provided, comprising a long cylindrical body 131, a narrow-diameter cylindrical body 132, and a transmission housing 133 connected in sequence. The outer diameter of the narrow-diameter cylindrical body 132 is smaller than the outer diameter of the long cylindrical body 131. The outer rotating sleeve 210 of the anti-sway mechanism 200 is rotatably mounted on the narrow-diameter cylindrical body 132, which can reduce the space occupied by the anti-sway mechanism 200. The long cylindrical body 131 and the narrow-diameter cylindrical body 132 are coaxially arranged with the inner rotating shaft 140. The sliding groove 1332 is formed on the transmission housing 133.

[0061] The second linear drive device 310 is mounted on the transmission housing 133. A first opening 1331 is provided on the transmission housing 133. The grinding wheel housing 360 is slidably connected to the first opening 1331. The transmission housing 133 and the grinding wheel housing 360 together form a protective cavity, within which the driving pulley 381, driven pulley 382, ​​tension pulley 383, and tension transmission belt 388 are all located. The transmission housing 133 and the grinding wheel housing 360 provide protection for the driving pulley 381, driven pulley 382, ​​tension pulley 383, and tension transmission belt 388. The upper part of the grinding wheel housing 360 passes through the first opening 1331 and enters the transmission housing 133. When the second linear drive device 310 drives the grinding wheel housing 360, the grinding wheel housing 360 will move relative to the transmission housing 133, but will not detach from the transmission housing 133.

[0062] In some embodiments, please refer to Figure 7 and Figure 9The grinding mechanism 300 also includes a wear detection device 390, which is mounted on the grinding wheel housing 360. The wear detection device 390 is used to detect whether the outer diameter of the grinding wheel body 330 has worn to a preset value. The wear detection device 390 is electrically connected to the controller. The wear detection device 390 uses a photoelectric sensor or a laser sensor. The wear detection device 390 detects the end face or wheel surface of the grinding wheel. In this embodiment, the wear detection device 390 detects the end face of the grinding wheel, and the installation direction of the wear detection device 390 is consistent with the axial direction of the grinding wheel. When the wear of the grinding wheel is lower than the preset value, the outer diameter of the grinding wheel is larger, and the detection end of the wear detection device 390 can detect the end face signal of the grinding wheel. When the wear of the grinding wheel is higher than the preset value, the outer diameter of the grinding wheel decreases, and the detection end of the wear detection device 390 cannot detect the wheel surface signal of the grinding wheel. Instead, it sends a signal to the controller, and the operator can view the grinding wheel replacement signal on the controller's display screen.

[0063] In other embodiments, a wear detection device 390 may be provided to detect the surface of the grinding wheel. The installation direction of the wear detection device 390 is consistent with the radial direction of the grinding wheel. The wear detection device 390 detects the distance from the surface of the grinding wheel in real time and sends the signal to the controller. The operator can view the amount of wear on the grinding wheel in real time through the display screen of the controller.

[0064] In some embodiments, please refer to Figure 1 and Figure 3 To enhance the support strength of the outer fixed sleeve 130, a roller support mechanism 400 is provided. The roller support mechanism 400 includes a roller support frame 410 and an axial roller 420. The roller support frame 410 is fixedly connected to the frame 500. The axial roller 420 is rotatably mounted on the roller support frame 410 via bearings. The axial roller 420 has a V-shaped annular groove 421 adapted to the outer fixed sleeve 130, providing radial constraint to the outer fixed sleeve 130. The outer fixed sleeve 130 and the axial roller 420 are in rolling connection. The axial roller 420 provides an intermediate support point for the outer fixed sleeve 130, improving its stability.

[0065] It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the scope of protection of this invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

[0066] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A device for grinding the inner wall of cast pipe, characterized in that, include: The grinding feed mechanism (100) includes a first linear drive device (110), a first rotary power source (120), an outer fixed sleeve (130), and an inner rotating shaft (140). The first linear drive device (110) has a movable end (111) capable of linear movement along the axial direction of the cast pipe (800). The first rotary power source (120) is mounted on the movable end (111), the outer fixed sleeve (130) is fixedly mounted on the movable end (111), and the inner rotating shaft (140) is rotatably mounted inside the outer fixed sleeve (130) and driven to rotate by the first rotary power source (120). The anti-sway mechanism (200) includes an outer rotating sleeve (210), a positioning wheel assembly (220), and a spacing adjustment mechanism (230). The outer rotating sleeve (210) is rotatably mounted on the outer fixed sleeve (130). The positioning wheel assembly (220) is circumferentially distributed around the outer rotating sleeve (210). The spacing adjustment mechanism (230) is mounted on the outer rotating sleeve (210). The positioning wheel assembly (220) adjusts the spacing with the outer rotating sleeve (210) through the spacing adjustment mechanism (230). The grinding mechanism (300) includes a second linear drive device (310), a pressure detection device (320), and a grinding wheel body (330). The grinding wheel body (330) is connected to the inner rotating shaft (140) for transmission. The second linear drive device (310) is fixedly connected to the outer fixed sleeve (130). The second linear drive device (310) drives the grinding wheel body (330) to move radially along the inner rotating shaft (140) so that the grinding wheel body (330) approaches or moves away from the inner wall of the casting pipe (800). The pressure detection device (320) detects the pressure between the grinding wheel body (330) and the inner wall of the casting pipe (800). The positioning wheel assembly (220) includes a positioning wheel body (221) for contacting and engaging with the inner wall of the cast pipe (800) and a positioning wheel frame (222) rotatably connected to the positioning wheel body (221). The spacing adjustment mechanism (230) includes a bearing seat (231), a double-rotating lead screw (232), and a moving assembly (234). The moving assembly (234) is symmetrically arranged on both sides of the positioning wheel assembly (220). The moving assembly (234) includes a guide rail (2341), a telescopic rod (2342), a connecting piece (2343), a synchronous ring plate (2344), and a nut seat (2345). The guide rail (2341) is fixedly installed on the outer rotating sleeve (210). One end of the telescopic rod (2342) is fixedly connected to the outer rotating sleeve (210), and the other end is connected to the positioning wheel. The frame (222) is fixedly connected; the synchronous ring plate (2344) is fixedly connected to the slider of the guide rail (2341); the connecting piece (2343) corresponds to the positioning wheel assembly (220) and is distributed in a circle around the outer rotating sleeve (210). One end of the connecting piece (2343) is hinged to the synchronous ring plate (2344), and the other end is hinged to the positioning wheel frame (222); the nut seat (2345) is fixedly installed on the synchronous ring plate (2344); the double-rotating screw (232) is threadedly connected to the nut seat (2345), and the shaft seat (231) is fixedly installed on the outer rotating sleeve (210). The double-rotating screw (232) is rotatably connected to the shaft seat (231); by rotating the double-rotating screw (232), the two nut seats (2345) can be driven to move towards each other or away from each other. The grinding mechanism (300) also includes an adjusting seat (340), an elastic device (350), a grinding wheel housing (360), and a grinding wheel shaft (370). The grinding wheel body (330) is fixedly installed on the grinding wheel shaft (370). The grinding wheel shaft (370) is rotatably connected to the grinding wheel body housing (330). The grinding wheel shaft (370) is drive-connected to the inner rotating shaft (140). The adjusting seat (340) is installed at the output end of the second linear drive device (310). The pressure detection device (320) is installed on the adjusting seat (340). The detection end of the pressure detection device (320) is connected to the grinding wheel housing (360) through the elastic device (350). The grinding mechanism (300) further includes a tension transmission assembly (380), which includes a driving pulley (381), a driven pulley (382), a tension pulley (383), a tension shaft (384), a guide rod (385), a guide seat (386), and an elastic element (387). The guide rod (385) is disposed on both sides of the tension pulley (383), and the guide rod (385) is detachably and fixedly connected to the outer fixing sleeve (130). The guide seat (386) is slidably mounted on the guide rod (385), and the tension shaft (384)... Both ends are connected to two guide seats (386) respectively. The tension pulley (383) is rotatably mounted on the tension shaft (384). A limit ring is fixed on the guide rod (385). One end of the elastic element (387) is connected to the limit ring, and the other end is connected to the guide seat (386). The driving pulley (381) is mounted on the inner rotating shaft (140), and the driven pulley (382) is mounted on the grinding wheel shaft (370). The driving pulley (381), the driven pulley (382), and the tension pulley (383) are connected by a tension transmission belt (388).

2. The grinding device for the inner wall of cast pipe according to claim 1, characterized in that, The pitch adjustment mechanism (230) also includes a handle (233), which is mounted on a double-rotating lead screw (232).

3. The grinding device for the inner wall of cast pipe according to claim 1, characterized in that, The outer fixed sleeve (130) includes a long cylindrical body (131), a narrow-diameter cylindrical body (132) and a transmission housing (133) connected in sequence. The outer diameter of the narrow-diameter cylindrical body (132) is smaller than the outer diameter of the long cylindrical body (131). The outer rotating sleeve (210) is rotatably mounted on the narrow-diameter cylindrical body (132). The second linear drive device (310) is mounted on the transmission housing (133). The transmission housing (133) has a first opening (1331). The grinding wheel housing (360) is slidably connected to the first opening (1331). The transmission housing (133) and the grinding wheel housing (360) together form a protective cavity. The driving pulley (381), the driven pulley (382), the tensioning pulley (383), and the tensioning transmission belt (388) are all located inside the protective cavity.

4. The grinding device for the inner wall of cast pipe according to claim 1, characterized in that, The grinding mechanism (300) also includes a wear detection device (390), which is installed on the grinding wheel housing (360). The wear detection device (390) is used to detect whether the outer diameter of the grinding wheel body (330) is worn to a preset value.

5. The grinding device for the inner wall of cast pipe according to claim 1, characterized in that, It also includes a roller support mechanism (400), which includes a roller support frame (410) and an axial roller (420). The axial roller (420) is rotatably mounted on the roller support frame (410). The axial roller (420) has a V-shaped annular groove (421) adapted to the outer fixed sleeve (130). The outer fixed sleeve (130) is in rolling connection with the axial roller (420).

6. A grinding system for the inner wall of cast pipe, characterized in that, The device includes a frame (500), a rotating support device (600), and a grinding device for the inner wall of a cast pipe as described in any one of claims 1 to 5. The rotating support device (600) is configured in at least two parts. The rotating support device (600) includes an active radial support roller (610), a driven radial support roller (620), and a second rotating power source (630). The active radial support roller (610) and the driven radial support roller (620) are rotatably connected to the frame (500). The second rotating power source (630) drives the active radial support roller (610) to rotate. A limiting space for accommodating the cast pipe (800) is formed between the active radial support roller (610) and the driven radial support roller (620).

7. The pipe inner wall grinding system according to claim 6, characterized in that, It also includes a pressing mechanism (700), which includes a third linear drive device (710), a pressure roller frame (720) and a pressing roller (730). The third linear drive device (710) is mounted on the frame (500), and the pressure roller frame (720) is mounted on the output end of the third linear drive device (710). The pressing roller (730) is rotatably mounted on the pressure roller frame (720) and is used to roll to the top of the casting pipe (800).

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