CN-121973067-A - Narrow clearance pipe interval grinding burnishing device

CN121973067ACN 121973067 ACN121973067 ACN 121973067ACN-121973067-A

Abstract

The invention discloses a narrow-gap pipe interval grinding and polishing device which comprises a frame body, wherein a clamping assembly and a guide rod set are arranged on the frame body, a sliding block is arranged on the guide rod set in a sliding mode, a bracket is arranged on the sliding block, a rocker is arranged on the bracket, one end of the rocker is hinged to the bracket through a pin, the other end of the rocker extends to two sides to form a T-shaped head, two ends of a grinding abrasive belt are respectively connected with two ends of the T-shaped head of the rocker, an elastic assembly is arranged between the sliding block and the frame body, the rocker is in transmission connection with a swing driving mechanism for driving the rocker to swing reciprocally, and when the swing driving mechanism drives the rocker to swing reciprocally around the pin, a grinding abrasive belt can be driven to be closely attached to the surface of a pipe bundle to be processed so as to grind and polish the surface of the pipe bundle to be processed. The invention has the advantages of compact structure, convenient operation, high working efficiency and adaptability to the gap overhauling working condition of narrow pipe spacing.

Inventors

LI QING
Zhen Jiaxin
WANG YUMENG

Assignees

吴钩科技(苏州)有限公司

Dates

Publication Date: 20260505
Application Date: 20260326

Claims (9)

1. The narrow-gap pipe interval grinding and polishing device is characterized by comprising a frame body, a clamping assembly and a grinding abrasive belt; the clamping assembly is fixed on the frame body and is used for extending into a narrow gap between the tube bundle to be processed and an adjacent tube bundle and clamping the tube bundle to be processed so as to fix the frame body on the tube bundle to be processed; The frame body is provided with a guide rod group, a slide block is arranged on the guide rod group in a sliding way, a bracket is arranged on the slide block, a rocker is arranged on the bracket, one end of the rocker is hinged to the bracket through a pin, the other end of the rocker extends to two sides to form a T-shaped head, and two ends of the grinding abrasive belt are respectively connected with two ends of the T-shaped head of the rocker; an elastic component is arranged between the sliding block and the frame body, and when the grinding abrasive belt is sleeved outside the tube bundle to be processed, the elastic component can enable the grinding abrasive belt to be always kept tight and tightly attached to the surface of the tube bundle to be processed; The rocking bar is in transmission connection with a swing driving mechanism for driving the rocking bar to swing reciprocally, and when the swing driving mechanism drives the rocking bar to swing reciprocally around the pin, the rocking bar can drive the grinding abrasive belt to abut against the surface of the tube bundle to be processed to move reciprocally so as to grind and polish the surface of the tube bundle to be processed.
2. The narrow gap pipe spacing grinding and polishing device of claim 1, wherein the clamping assembly comprises a fixed arm and a movable clamping arm, The fixing arm is fixed on the frame body and can extend into a narrow gap between the tube bundle to be processed and the adjacent tube bundle, and a fixing clamping opening corresponding to the tube bundle to be processed is formed in the fixing arm; The movable clamping arm can also extend into a narrow gap between a tube bundle to be processed and an adjacent tube bundle, the middle part of the movable clamping arm is hinged to the fixed arm through a hinge shaft, one end of the movable clamping arm is a clamping part, the other end of the movable clamping arm is a driving part, the clamping part of the movable clamping arm corresponds to a fixed clamping opening of the fixed arm, the driving part of the movable clamping arm is hinged with one end of a connecting block through a first pin shaft, the other end of the connecting block is hinged with the driving block through a second pin shaft, The actuating lever pass the actuating block and with actuating block threaded connection, the actuating lever passes through mounting structure and installs in the fixed arm, and installs the drive hand wheel in the outer end of actuating lever, the actuating lever passes through mounting structure and can rotate around self axis relative fixed arm when receiving external force drive to can keep unable free rotation's locking state again when removing external force.
3. The narrow gap pipe spacing grinding and polishing device of claim 2, wherein the mounting structure of the driving rod on the fixed arm is that a mounting transverse hole for the driving rod to pass through and two mounting vertical holes perpendicular to the mounting transverse hole are arranged on the fixed arm, and the two mounting vertical holes are respectively positioned at two sides of the mounting transverse hole and are directly communicated with the mounting transverse hole; Two symmetrical positioning notches are formed in the peripheral wall of the end part of the driving rod far away from the driving hand wheel at intervals along the circumferential direction, the end part of the driving rod with the positioning notch is inserted into the mounting transverse hole, the two positioning notches are correspondingly communicated with the two mounting vertical holes respectively, and a spring pin which simultaneously penetrates through the corresponding positioning notch is arranged in each mounting vertical hole in a penetrating manner; when the driving rod is driven to rotate by external force, the driving rod can rotate around the axis of the driving rod relative to the fixed arm against the elasticity of the spring pin; When the external force applied to the driving rod is removed and the two positioning notches of the driving rod are clamped with the corresponding spring pins again, the driving rod is restrained in the mounting transverse hole and cannot axially move under the limiting action of the two spring pins, and is restrained from rotating around the axis of the driving rod relative to the fixed arm to keep a locking state.
4. A narrow gap pipe spacing grinding and polishing device as claimed in claim 2 or 3, wherein the number of the clamping assemblies is two, and the two clamping assemblies are distributed on the upper side and the lower side of the frame body.
5. The narrow gap pipe spacing grinding and polishing device of claim 4, wherein the frame body is a '匚' frame body formed by upright posts and two cross arms, the opening side of the '匚' frame body faces to a pipe bundle to be processed, the guide rod group, the sliding block and the bracket are uniformly arranged in the opening of the '匚' frame body, the two cross arms of the '匚' frame body serve as fixing arms of the two clamping assemblies, and the upright posts of the '匚' frame body form a blocking piece for preventing the bracket from being excessively far away from the pipe bundle to be processed along the guide rod group.
6. The narrow gap pipe spacing grinding and polishing device of claim 1, wherein the swing driving mechanism comprises a swing motor arranged on the bracket, an output shaft of the swing motor is hinged with one end of a driving rod, the other end of the driving rod is hinged with one end of a connecting rod, and the other end of the connecting rod is hinged with the middle part of the rocker.
7. The narrow gap pipe spacing grinding and polishing device of claim 1, wherein the elastic component is a spring sleeved on a guide rod of the guide rod group, one end of the spring is abutted against one end of the sliding block, which is close to a pipe bundle to be processed, and the other end of the spring is abutted against the frame body.
8. The narrow gap pipe spacing grinding and polishing device of claim 1, wherein two I-shaped guide wheels capable of freely rotating around the axis of the bracket are fixed on the bracket, the two I-shaped guide wheels are distributed on two sides of the grinding abrasive belt, and the wheel groove of each I-shaped guide wheel is just used for the grinding abrasive belt to pass through.
9. The narrow gap pipe spacing grinding and polishing device of claim 1, wherein the structure of the I-shaped guide wheel comprises a shoulder screw formed by a head part and a rod part, the rod part of the shoulder screw is sequentially provided with a smooth section and a thread section along the axial direction far away from the head part, and the shoulder screw is detachably arranged on the bracket through the thread section; the smooth section of the shoulder screw is sequentially and movably sleeved with a first annular flat pad, a bearing and a second annular flat pad along the axial direction, and the outer diameters of the first annular flat pad and the second annular flat pad are both larger than the outer diameter of the bearing, so that the first annular flat pad, the bearing and the second annular flat pad jointly form a wheel groove for a grinding abrasive belt to pass through.

Description

Narrow clearance pipe interval grinding burnishing device Technical Field The invention relates to the technical field of metal pipe fitting machining, in particular to a narrow-gap pipe spacing grinding and polishing device which is particularly suitable for a narrow-gap pipe spacing working condition. Background The water-cooled wall is a core heating surface of heat energy equipment such as a power station boiler, an industrial boiler and the like, and is usually formed by connecting a plurality of steel pipes into a whole pipe row structure with good air tightness through flat steel (commonly called fins) welded between the steel pipes. Under the long-term high-temperature and high-pressure operation environment of the boiler, the water wall pipe can be subjected to the combined action of flue gas scouring, solid material impact and thermal stress, and the defects of abrasion, cracks and the like are easy to generate. In the repair and maintenance process of boilers, the locally damaged pipes are often required to be repaired. Because of the requirements of cutting and welding processes, operators can cut the connecting fins on two sides of a damaged pipe, so that a narrow temporary process opening is formed between the damaged pipe section and the adjacent pipe row of the damaged pipe section respectively, then the damaged pipe section of the pipe is cut off and a new pipe section is welded, after the welding is finished, the surface of the welding position of the new pipe section and the old pipe section can leave defects such as weld seam excess height, and the like, and the microscopic defects are very easy to become stress concentration points in the starting and stopping and variable load running processes of the boiler, can be expanded into macroscopic cracks under the action of thermal fatigue, and finally lead to pipe wall leakage or pipe explosion. Therefore, the welding part of the pipe section after the overhaul is subjected to precise grinding and polishing treatment, so that the surface welding defect is thoroughly eliminated, and the method is a necessary means for preventing the partial abrasion from being too fast, prolonging the service life of the water cooling wall and ensuring the safe operation of the boiler. However, because the pipe spacing between the pipe bundles in the water-cooled wall is extremely narrow, the on-site maintenance at present mostly depends on manually adopting small-sized grinding wheel sheets or files to manually grind and polish the welding parts, but the mode has the following defects that the reciprocating manual operation in a narrow space is time-consuming and labor-consuming, the working efficiency is low, and the overhauling and shutdown time of the boiler is prolonged. Therefore, there is a need for a grinding and polishing apparatus that can accommodate the gap maintenance work of narrow pipe spacing and has high work efficiency. Disclosure of Invention The invention aims to provide the narrow-gap pipe spacing grinding and polishing device which has the advantages of compact structure, convenience in operation and high working efficiency and can adapt to the working condition of narrow-gap pipe spacing overhaul clearance. The narrow-gap pipe spacing grinding and polishing device comprises a frame body, a clamping assembly and a grinding abrasive belt; the clamping assembly is fixed on the frame body and is used for extending into a narrow gap between the tube bundle to be processed and an adjacent tube bundle and clamping the tube bundle to be processed so as to fix the frame body on the tube bundle to be processed; The frame body is provided with a guide rod group, a slide block is arranged on the guide rod group in a sliding way, a bracket is arranged on the slide block, a rocker is arranged on the bracket, one end of the rocker is hinged to the bracket through a pin, the other end of the rocker extends to two sides to form a T-shaped head, and two ends of the grinding abrasive belt are respectively connected with two ends of the T-shaped head of the rocker; an elastic component is arranged between the sliding block and the frame body, and when the grinding abrasive belt is sleeved outside the tube bundle to be processed, the elastic component can enable the grinding abrasive belt to be always kept tight and tightly attached to the surface of the tube bundle to be processed; The rocking bar is in transmission connection with a swing driving mechanism for driving the rocking bar to swing reciprocally, and when the swing driving mechanism drives the rocking bar to swing reciprocally around the pin, the rocking bar can drive the grinding abrasive belt to abut against the surface of the tube bundle to be processed to move reciprocally so as to grind and polish the surface of the tube bundle to be processed. Further, the narrow gap pipe spacing grinding and polishing device comprises a clamping assembly, a grinding and polishing device and a polishing d