Portable cleaning and grinding device for inner surface and outer surface of pipe end

Abstract

The utility model discloses a portable cleaning and grinding device for inner and outer surfaces of a pipe end. The portable cleaning and grinding device comprises a driving device and a grinding device, the driving device comprises a device shell, a gear shaft, a transmission gear mechanism, a rotating shell and a power device; the grinding device is a detachable assembly and comprises a fixing disc, an outer grinding frame, an inner grinding head, a tensioning mechanism and a center shaft. The power device transmits generated power opposite in rotating direction to the outer grinding frame and the center shaft on the grinding device through the rotating shell and the gear shaft, grinding materials make close contact with the surface of a workpiece through cooperation of the tensioning mechanism and the outer grinding frame, and then the purpose of cleaning and grinding the surface of the workpiece is achieved through the rotating effect. The pipe end cleaning device is used for replacing manual work to clean the inner surface and the outer surface of the pipe end, and meanwhile the portable design scheme can be better applied to various production scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers and pressure vessels, in particular to a portable device for cleaning and grinding the inner and outer surfaces of pipe ends. Background Art

[0002] Metal tubes are widely used in boilers and pressure vessels, particularly in gas-fired waste heat boiler (HRSG) modules. HRSG modules primarily consist of heating surface tubes, headers, smoke baffles, sound insulation panels, shock absorbers, top guard plates, and insulation. Heating surface tubes are mostly made of small-diameter seamless steel pipe wound with fins. The heating surface tubes and headers are connected by welding, using a variety of welding methods, including butt welds, insert fillet welds, and butt-joint fillet welds.

[0003] In actual production, to ensure the quality of the welds connecting the heated surface tubes to the header, all surfaces to be welded, such as the header openings and the inner and outer surfaces of the tube ends, are mechanically polished to remove impurities and rust, leaving a metallic sheen. Because each product can have tens of thousands of welds on the heated surface tubes, the traditional method relies on workers grinding each tube individually with a handheld electric grinding wheel. This method is labor-intensive and inefficient, and the manually controlled, high-speed grinding wheel rotates along the inner and outer surfaces of the tubes, exposing the operator's hands to constant vibration and impact, which can cause them to bounce when in contact with the workpiece, posing a safety risk. Utility Model Content

[0004] In order to solve the above technical problems, the utility model designs a portable pipe end inner and outer surface cleaning and grinding device.

[0005] The utility model adopts the following technical solutions:

[0006] A portable device for cleaning and grinding the inner and outer surfaces of a pipe end, comprising a driving device and a grinding device;

[0007] The driving device includes a device housing, a gear shaft, a transmission gear mechanism, a rotating housing, and a power device; the gear shaft is rotatably connected inside the device housing, one end of the device housing is fixedly connected to the power device, the output end of the power device is connected to the gear shaft, and the device housing is rotatably connected to the transmission gear mechanism, the inner side of the transmission gear mechanism is meshed with the gear shaft for transmission, and the outer side of the transmission gear mechanism is meshed with the rotating housing rotatably connected to the outside of the device housing for transmission;

[0008] The grinding device is a detachable component, which includes a fixed disk, an outer grinding frame, an inner grinding head, a tensioning mechanism, and a center shaft; one end of the center shaft passes through the tensioning mechanism and is connected to the inner grinding head, and the other end is connected to the gear shaft through a connector. The fixed disk is fixedly connected to the rotating shell, and the outer grinding frame is an L-shaped structure, which is installed on the fixed seat through a movable pair. One end is equipped with an outer grinding block in the form of a pin shaft, and the other end is installed with a sliding device. The tensioning mechanism is squeezed between the sliding device and the inner grinding head.

[0009] Preferably, the device housing serves as the main body of the supporting equipment and has sufficient rigidity. It includes a housing front cover and a housing body. The housing front cover is fixed to the housing body by bolts. The best solution is to use aluminum alloy material to reduce the overall weight of the equipment.

[0010] Preferably, a gear is fixedly connected to the gear shaft, one end of which is a polygonal structure, and the better solution is a hexagonal cross-section structure, and the other end is connected to the power unit, which is a detachable rigid connection, and the better solution is to use a spline connection.

[0011] Preferably, the transmission gear mechanism includes a plurality of gears, which are mounted between the housing body and the housing front cover through bearings, and the plurality of gears are engaged with the gears on the gear shaft. A preferred embodiment of the transmission gear mechanism includes three identical gears, which are arranged at 120° intervals, and the gear width thereof is slightly smaller than the gear width on the gear shaft.

[0012] Preferably, the rotating shell is made of steel, includes a cylindrical shell and a limiting ring plate, and is rotatably connected to the device shell through bearings. Annular gears are distributed inside the rotating shell and engage with the transmission gear mechanism, and the gear width is slightly larger than the gear width of the transmission gear mechanism.

[0013] Preferably, a groove is arranged on the end surface of the rotating shell for installing the fixed disk.

[0014] Preferably, the limiting ring plate is a segmented structure, fixed to the rotating shell by bolts for limiting positioning. A preferred solution is that the limiting ring plate is divided into two semicircular rings, and the inner diameter of the ring plate is smaller than the diameter of the tooth top circle inside the rotating shell.

[0015] Preferably, a hanger is fixedly connected to the shell body by bolts. A better solution is that the hanger is made of aluminum alloy to reduce the overall weight of the equipment.

[0016] Preferably, the power device is fixed to the housing body by bolts and connected to the gear shaft by splines to provide rotational power for the entire device. A better solution is to use an electric motor as the power device.

[0017] Preferably, one end of the fixed plate has a protrusion that can cooperate with the groove of the rotating shell and is then fixed with bolts. The other end is provided with a fixing seat for fixing the outer grinding frame. The best solution is to use aluminum alloy material, and two sets of symmetrical fixing seats are arranged on the fixed plate.

[0018] Preferably, the outer grinding block is detachable and replaceable, and the sliding device adopts a pulley with a curved surface.

[0019] Preferably, the central shaft is a polygonal cross-section rod with a thread at one end and a connector at the other end for quick connection with the end of the gear shaft and transmission of torque. A better solution is that the central shaft adopts a hexagonal cross-section and the connector is a quick-release type.

[0020] Preferably, the inner grinding head includes a limiting shell and an inner grinding block.

[0021] Preferably, the center of the limiting shell has an opening for assembly with the central axis and is fixed by a nut. The limiting shell has a slot, and the inner grinding block is installed on the slot. The inner grinding blocks on the limiting shell are arranged symmetrically.

[0022] Preferably, the inner grinding block comprises a wedge-shaped base and abrasives.

[0023] Preferably, the tensioning mechanism includes a wedge-shaped top block, a spring, an adjusting wheel and a base. The base is used to fix the spring, the adjusting wheel and receive the thrust generated by the action of the external grinding frame. The adjusting wheel rotates to adjust the preload force of the spring, which acts on the wedge-shaped top block through the spring. The wedge-shaped top block is used to raise the inner grinding block in the inner grinding head so that the inner grinding block can fit tightly against the workpiece.

[0024] The beneficial effects of the utility model are as follows: the utility model is used to replace manual cleaning of the inner and outer surfaces of the pipe end, and the portable design can be better applied to various production scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model;

[0026] Figure 2 This is a structural diagram of the gear shaft in the utility model;

[0027] Figure 3 This is a structural diagram of the inner grinding head in the utility model;

[0028] Figure 4 This is a structural diagram of the tensioning mechanism in the utility model;

[0029] In the figure: 1. Device housing, 2. Gear shaft, 3. Transmission gear mechanism, 4. Rotating housing, 10. Hanger, 11. Power device, 5. Fixed disk, 6. Outer grinding frame, 7. Center shaft, 8. Inner grinding head, 9. Tensioning mechanism, 101. Housing body, 102. Housing front cover, 103. Fastening nut, 401. Limiting ring plate, 501. Fixed disk fixing screw, 502. Fixed seat, 601. Sliding device, 602. Outer grinding block, 603. Return spring, 701. Connector, 801. Limiting housing, 802. Inner grinding block, 901. Wedge-shaped top block, 902. Spring, 903. Adjusting wheel, 904. Base. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0031] Example: Figures 1-4 As shown, a portable device for grinding the inner and outer surfaces of pipe ends comprises a device housing 1, a gear shaft 2, a transmission gear mechanism 3, a rotating housing 4, a hanger 10, a power unit 11, a fixed plate 5, an outer grinding frame 6, a center shaft 7, an inner grinding head 8, and a tensioning mechanism 9. The power unit transmits the power generated in opposite directions of rotation to the outer grinding frame and the center shaft of the grinding device through the rotating housing and the gear shaft, respectively. The tensioning mechanism and the outer grinding frame then cooperate to bring the abrasive into close contact with the workpiece surface, and the rotational action achieves the purpose of grinding the workpiece surface.

[0032] By adopting the above technical solution, the hanger 10 is fixed to the housing body via bolts. The gear shaft 2 is installed within the housing body 101 and the housing front cover 102 via bearings. One end of the hexagonal cross-section of the gear shaft 2 extends out of the housing front cover 102. The transmission gear mechanism 3 includes three sets of identical gears arranged at 120° intervals. The gear width is slightly smaller than the gear width on the gear shaft. The three sets of identical gears are installed between the housing body 101 and the housing front cover 102 via bearings and mesh with the gears on the gear shaft 2. A suitable amount of grease is applied to the gear meshing points and bearing positions. The housing body 101 and the housing front cover 102 are fastened together via bolts. The shaft of the power unit 11 is connected to one end of the gear shaft 2 via a spline, and the power unit 11 is further fixed to the housing body 101 via bolts.

[0033] By adopting the above technical solution, the rotating shell 4 is installed on the shell front cover 102 through bearings and is fixed by fastening nuts 103. A circle of gears is arranged on the inside of the rotating shell 4, and meshes with the gears of the transmission gear mechanism 3. An appropriate amount of grease is applied to the gear meshing position. The limiting ring plate 401 is two semicircular rings installed on the end face of the rotating shell 4 and fastened with screws. The inner diameter of the limiting ring plate 401 is smaller than the diameter of the tooth top circle inside the rotating shell, which can limit the rotating shell 4.

[0034] By adopting the above technical solution, one end of the fixed disk 5 has a protrusion and can cooperate with the groove of the rotating shell 4, and is fixed by the fixed disk fixing screw 501. The other end of the fixed disk 5 has two sets of symmetrically arranged fixing seats 502. The fixing seats 502 are fixed to the fixed disk 5 by a rigid connection. The outer grinding frame 6 is installed on the fixing seat 502 through a pin shaft and can rotate. The fixed disk 5 can be driven by the rotating shell 4 and rotate therewith, while driving the outer grinding frame 6 to rotate.

[0035] By adopting the above technical solution, the outer grinding frame 6 is an L-shaped structure, one end of which is connected to the outer grinding block 602 through a detachable pin and can rotate around the pin within a certain angle range, and the other end is assembled with a sliding device 602 through an axis and can rotate freely around the central axis. The sliding device 602 is annular, and the arc-shaped outer circle can better contact with the tensioning device 9 during movement. The device is in state I.

[0036] By adopting the above technical solution, the central axis 7 is a rod with a hexagonal cross section.

[0037] By adopting the above technical solution, the rotational power generated by the power device 11 is transmitted to the gear shaft 2 , and then the power in the opposite direction of rotation is generated through the transmission gear mechanism 3 and transmitted to the rotating housing 4 .

[0038] By adopting the above technical solution, the central shaft 7 is a shaft with a hexagonal cross-section, one end of which is threaded and the other end is rigidly fixed to it through a quick-release connector 701. The connector 701 is connected to the end of the gear shaft 2 and transmits torque. The inner grinding head 8 and the tensioning mechanism 9 have a hexagonal opening in the center that can match the central shaft 7 and be installed and fixed by a nut.

[0039] A complete set of equipment also includes electronic control system, pneumatic system, etc.

[0040] Instructions for using the device:

[0041] The device can be loaded on a hoist, a constant force boom, or a robot through a lifting mechanism. The static state of the device is as follows: Figure 1 As shown in Figure 1, when using the device, the limiting shell 801 is roughly aligned with the center of the workpiece (pipe P). During the process of pushing the device in, the inclined surface of the end of the limiting shell 801 plays a guiding role. The power supply device 11 is started to drive the gear shaft 2 to rotate, and the rotational power is transmitted to the rotating shell 4 through the transmission gear mechanism 3, which in turn drives the outer grinding frame 6 to rotate, and the device is pushed in. Figure 1In the position shown in center II, the outer grinding frame 6 is open, and the sliding device 601 pushes the base 904, compressing the spring 902. The elastic force generated by the spring 902 pushes the wedge-shaped top block 901 under the inner grinding block 802. The inner grinding block 802 is in contact with and continuously applies pressure to the inner wall of the pipe P. The central shaft 7 rotates, driving the limit housing 801 to rotate. The limit housing 801 in turn drives the inner grinding block 802 to rotate, causing relative movement with the inner wall of the pipe P, thereby grinding the inner wall. Simultaneously, the reaction force of the spring 902 is applied to the outer grinding block 602 through the outer grinding frame 6. The outer grinding block 602 is in contact with and continuously applies pressure to the outer wall of the pipe P. The rotation of the outer grinding frame 6 drives the outer grinding block 602 to rotate and move relative to the outer wall of the pipe P, thereby grinding the outer wall. The preload force of the spring 902 is adjusted by rotating the adjusting wheel 903 to ensure that the tensioning mechanism 9 is in the appropriate preload state. After grinding is completed, the equipment is pulled out in the opposite direction. This process can also grind the inner and outer walls of the pipe P until the outer grinding block 602 is completely separated from the pipe P. At this time, the reset spring 603 pulls the outer grinding frame 6 to restore it to its initial state I.

[0042] The outer grinding block 602 and the inner grinding block 802 are consumables and need to be replaced when they are worn. When replacing the outer grinding block 602, the replacement can be completed by removing the pin shaft connected to the outer grinding frame 6; when replacing the inner grinding block 802, the nut at the end of the central shaft 7 is removed, the inner grinding head 8 assembly is taken out, and the inner grinding block 802 is taken out from the opening side and replaced.

[0043] The embodiment described above is only a preferred solution of the present invention and does not limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A portable pipe end inner and outer surface grinding device, characterized in that: It includes a driving device and a grinding device; The driving device includes a device housing, a gear shaft, a transmission gear mechanism, a rotating housing, and a power device; the gear shaft is rotatably connected inside the device housing, one end of the device housing is fixedly connected to the power device, the output end of the power device is connected to the gear shaft, and the device housing is rotatably connected to the transmission gear mechanism, the inner side of the transmission gear mechanism is meshed with the gear shaft for transmission, and the outer side of the transmission gear mechanism is meshed with the rotating housing rotatably connected to the outside of the device housing for transmission; The grinding device is a detachable component, which includes a fixed disk, an outer grinding frame, an inner grinding head, a tensioning mechanism, and a center shaft; one end of the center shaft passes through the tensioning mechanism and is connected to the inner grinding head, and the other end is connected to the gear shaft through a connector. The fixed disk is fixedly connected to the rotating shell, and the outer grinding frame is an L-shaped structure, which is installed on the fixed seat through a movable pair. One end is equipped with an outer grinding block in the form of a pin shaft, and the other end is installed with a sliding device. The tensioning mechanism is squeezed between the sliding device and the inner grinding head.

2. A portable pipe end inner and outer surface cleaning device according to claim 1, characterized in that: The device housing comprises a housing front cover and a housing body, and the housing front cover is fixed to the housing body by bolts.

3. A portable pipe end inner and outer surface cleaning device according to claim 1, characterized in that: The gear shaft is fixedly connected to a gear, one end of which is a polygonal structure and is connected to the connector, and the other end is connected to the power device, which is a detachable rigid connection.

4. A portable pipe end inner and outer surface grinding device according to claim 1, characterized in that: The transmission gear mechanism includes a plurality of gears, which are rotatably connected between the housing body and the housing front cover through bearings, and the plurality of gears are respectively engaged with the gears on the gear shaft.

5. A portable pipe end inner and outer surface cleaning device according to claim 1, characterized in that: The rotating shell includes a cylindrical shell and a limiting ring plate. The rotating shell is rotatably connected to the device shell through a bearing. Annular gears are distributed inside the rotating shell and engage with the transmission gear mechanism. A groove is arranged on the end face of the rotating shell for installing the fixed disk. The limiting ring plate is a segmented structure and is fixed to the rotating shell by bolts for limiting.

6. A portable pipe end inner and outer surface cleaning device according to claim 2, characterized in that: The shell body is fixedly connected with a hanger via bolts.

7. A portable pipe end inner and outer surface cleaning device according to claim 5, characterized in that: One end of the fixed disc has a protrusion that can cooperate with the groove of the rotating shell and is then fixed with bolts. The other end is provided with a fixing seat for installing the outer grinding frame.

8. The portable pipe end inner and outer surface grinding device according to claim 1 is characterized in that: The central shaft is a polygonal cross-section rod, one end of which is provided with a thread, and the other end is quickly connected to the end of the gear shaft through a connector to transmit torque.

9. A portable pipe end inner and outer surface cleaning device according to claim 1, characterized in that: The inner grinding head includes a limiting shell and an inner grinding block. The limiting shell has an opening in the center for assembly with the central axis and is fixed by a nut. The limiting shell is provided with a slot, and the inner grinding block is installed on the slot. The inner grinding blocks on the limiting shell are arranged symmetrically in a group, and the inner grinding blocks include a wedge-shaped base and abrasives.

10. A portable pipe end inner and outer surface grinding device according to claim 1, characterized in that: The tensioning mechanism includes a wedge-shaped top block, a spring, an adjusting wheel and a base. The base is used to fix the spring, the adjusting wheel and receive the thrust generated by the action of the outer grinding frame. The adjusting wheel rotates to adjust the preload force of the spring, which acts on the wedge-shaped top block through the spring. The wedge-shaped top block is used to raise the inner grinding block in the inner grinding head so that the inner grinding block can fit tightly against the workpiece.

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