Corrosion-resistant pipeline sight glass

Abstract

The invention relates to the field of pipeline fittings, in particular to a corrosion-resistant pipeline sight glass which comprises a fixed base, a rate monitoring device is fixedly installed at the right end of the rear side of the fixed base, a corresponding electric control box is arranged on the rate monitoring device, and pipeline glass bases are symmetrically arranged at the upper end and the lower end of the middle of the right side of the fixed base. A pipeline sight glass assembly is arranged between the pipeline sight glass seats, and a movable speed adjusting assembly is arranged in the middle of the pipeline sight glass assembly. When the velocity monitoring device is used, special-shaped teeth in the velocity monitoring device are meshed with tooth blocks on an elliptical ring strip through flowing pressure of a to-be-observed medium in a transparent tube, so that the elliptical ring strip performs reciprocating directional movement in a limiting groove, a fixed rod slides in a sliding hole along with the elliptical ring strip, the fixed rod shifts shifting rods of a plurality of shifting rod seats, and the velocity monitoring device is positioned in the transparent tube. And the stirring interval time is collected and calculated through the corresponding sensors, and through visual data analysis, corresponding operation processing such as increasing and decreasing supply can be carried out on the medium in the pipeline, so that the accident occurrence condition is reduced.

Description

Technical Field

[0001] The invention relates to the field of pipeline accessories, and in particular to a corrosion-resistant pipeline sight glass. Background Art

[0002] Pipeline sight glass generally refers to straight-through sight glass. Straight-through sight glass is widely used as an important accessory in pipelines and equipment. It can be used in chemical towers with high temperature, strong corrosion, easy to poison, high danger, and easy to crystallize to ensure its safe production. Through it on industrial pipelines, the flow reaction of liquid, gas, steam and other media in the pipeline can be observed at any time to monitor production and avoid accidents during the production process.

[0003] Since it is necessary to monitor the flow reaction of the observed liquid, gas, steam and other media, there are special corrosion resistance requirements for the materials and use environment of the pipeline sight glass. At the same time, in order to reduce the probability of corresponding corrosion, the disassembly of the pipeline needs to be avoided as much as possible, thus forming an integrated visualization mirror pipeline.

[0004] At present, when the outer wall of the visual mirror pipe is made, the corresponding glass is used to ensure the sealing and reduce the corresponding corrosion. However, due to the colorless state of the transported medium, the visual pipe sight glass loses its corresponding use ability and cannot judge the flow rate of the medium. Secondly, when the corresponding flow rate is slow or there is an extrusion blockage in the flowing pipe, the pipe needs to be disassembled accordingly, which is inconvenient for the maintenance of the integrated pipe. The corresponding disassembly gap will cause the connection between the inner and outer walls of the pipe, and the sealing after disassembly cannot be guaranteed, which has a significant impact on the corrosion resistance of the inner wall of the pipe.

[0005] Therefore, those skilled in the art provide a corrosion-resistant pipeline sight glass to solve the problems raised in the above background technology. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a corrosion-resistant pipeline sight glass, comprising a fixed base, a speed monitoring device is fixedly installed at the right end of the rear side of the fixed base, a corresponding electric control box is arranged on the speed monitoring device, pipeline sight glass seats are symmetrically arranged at the upper and lower ends of the middle part of the right side of the fixed base, a pipeline sight glass assembly is arranged between the pipeline sight glass seats, a movable speed adjustment assembly is arranged in the middle part of the pipeline sight glass assembly, and the electric control box can electrically control and drive the speed adjustment assembly;

[0007] The speed monitoring device includes a limit seat, a limit groove, a sliding hole, a ring plate, a lever seat, an elliptical ring strip, a tooth block, a special-shaped tooth, a positioning ring groove, a fixed rod and a connecting rod. The front end face of the limit seat is provided with a limit groove, the middle part of the right end face of the limit seat is provided with a sliding hole, and a plurality of lever seats are provided along the edge of the sliding hole at the right end of the limit seat. An elliptical ring strip that can slide up and down is provided in the limit groove, a fixed rod is fixedly installed at the right end of the elliptical ring strip, the fixed rod passes through the sliding hole, and the fixed rod can be used in coordination with the lever on the lever seat for shifting, a plurality of tooth blocks are symmetrically fixed to the middle part of the inner ring side of the elliptical ring strip, and special-shaped teeth are provided on the middle side of the elliptical ring strip, and the special-shaped teeth form a rack meshing with the tooth blocks on the inner sides of the elliptical ring strip, a connecting rod is fixedly installed at the front end of the special-shaped teeth, and the connecting rod is fixedly connected to the speed adjustment component.

[0008] Preferably, a smooth mirror is arranged inside the bottom of the limiting groove to reflect light to the pipeline sight glass assembly, thereby facilitating the velocity observation of the flow medium in the pipeline sight glass assembly.

[0009] Preferably, a ring plate is fixedly installed in the middle of the bottom of the limiting groove, a positioning ring groove is opened in the middle of the rear end surface of the special-shaped tooth, and the positioning ring groove and the ring plate are rotatably arranged correspondingly.

[0010] Preferably: the borescope seat includes a sleeve, a bolt seat plate, a fixing bolt, a flange, a long column and a tapered hole piece. Flanges are symmetrically arranged on the upper and lower ports of the arc surface on the right end of the fixed base. A tapered hole piece is fixedly installed on the inner side of the flange. A sleeve is arranged on the inner side of the flange, and the tapered hole piece is snap-fitted and placed in the sleeve.

[0011] Preferably, a bolt seat plate symmetrically arranged front and rearward is arranged in the middle of the sleeve ring side, a plurality of fixing bolts are arranged on the bolt seat plate, and a long column rod and bolt nut are used to cooperate and close together between the flanges, so as to limit and fasten the pipeline sight glass assembly.

[0012] Preferably: the pipe sight glass assembly includes a transparent tube, an insert ring, a positioning bolt plate, a base and a special-shaped protrusion. The transparent tube is a multi-angle air duct made of glass. Glass has good visualization ability, its own strength and activity are relatively stable, and it is not easy to produce chemical reactions and cause corrosion of the pipeline.

[0013] Preferably, the ports at both ends of the transparent tube are fixedly connected to insert rings, and the insert rings are engaged with the gap cavity formed by the tapered hole member and the inner wall of the sleeve.

[0014] Preferably: positioning bolt plates are symmetrically arranged in the middle of the end ring sides at both ends of the transparent tube, the positioning bolt plates correspond to the bolt seat plates, and the positioning bolt plates and the bolt seat plates are fixed by fixing bolts, so that the transparent tube can be fixed on the pipeline mirror seat, which is convenient for subsequent rate monitoring. A base is provided in a sealing connection on the left side of the middle section of the transparent tube, and the base is used for limiting the placement of the rate adjustment component. Special-shaped convex parts are symmetrically arranged in the middle section of the transparent tube, so as to facilitate guiding the medium flowing in the transparent tube to the rate adjustment component for driving rotation, and then transmitting it to the rate monitoring device, which is convenient for monitoring the flow rate of the medium.

[0015] Preferably: the speed adjustment component includes a motor seat, a servo motor, a limit shaft seat, a built-in groove, a shaft rod, a movable block, a limit spring, a rate rotating fan, a limit circular groove and a ratchet groove, the motor seat is fixed in the middle of the front right end of the fixed base, the servo motor is arranged on the motor seat, the limit shaft seat is fixedly installed in the middle of the rear end of the servo motor, a plurality of built-in grooves are annularly arranged in the front of the outer side wall of the limit shaft seat, the shaft rod is fixedly installed in the built-in groove, a rotatable movable block is sleeved on the shaft rod, a limit spring is arranged on the lower side of the movable block, and the other end of the limit spring is arranged at the bottom of the built-in groove.

[0016] Preferably: a rate rotating fan is provided on the rear side of the limit shaft seat, the rate rotating fan is placed in the base, the rate rotating fan is fixedly connected to the connecting rod, a limit circular groove is provided in the middle of the rate rotating fan, the limit circular groove and the limit shaft seat rotate accordingly, a ratchet groove is provided on the front side of the inner wall of the limit circular groove, the ratchet groove and the movable block are correspondingly provided with a conflict, the unidirectional rotation of the ratchet groove can make the rate rotating fan move due to the pressure of the medium flow, causing the rate monitoring device to move.

[0017] Technical effects and advantages of the present invention:

[0018] 1. When the present invention is used, the flow pressure of the medium such as liquid, gas or steam to be observed in the transparent tube causes the special-shaped teeth in the rate monitoring device to mesh with the tooth blocks on the elliptical ring bar, so that the elliptical ring bar performs reciprocating directional movement in the limit groove, and the fixed rod slides in the sliding hole accordingly. The fixed rod moves the levers of multiple lever seats, and the interval time of the movement is collected and calculated by the corresponding sensor. Through intuitive data analysis, the medium in the pipeline can be subjected to corresponding operation processing such as increasing or decreasing the supply, thereby reducing the occurrence of accidents.

[0019] 2. When the present invention is used, the servo motor is controlled by the electric control box to drive the limit shaft seat to rotate. Since the movable block is deformed and stretched in the built-in groove by the limit spring, it will rotate around the shaft rod and then abut against the ratchet groove, so that the limit shaft seat drives the speed fan to rotate, thereby pushing the flowing medium in the transparent tube to eliminate the blockage problem caused by slow medium flow rate or medium backlog, reduce the inconvenience of later maintenance, and reduce the corrosive effect caused by the gap after disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure provided by this application;

[0021] Figure 2 It is a structural schematic diagram of the rate detection device provided by the present application;

[0022] Figure 3 It is a structural schematic diagram of the borescope base provided by the present application;

[0023] Figure 4 It is a schematic diagram of the structure of the pipeline sight glass assembly provided by the present application;

[0024] Figure 5 is a schematic diagram of the structure of the rate regulating component provided by the present application;

[0025] In the figure: 1. Fixed base; 2. Rate monitoring device; 3. Electric control box; 4. Borescope base; 5. Borescope assembly; 6. Rate adjustment assembly;

[0026] 21. Limit seat; 22. Limit groove; 23. Slide hole; 24. Ring plate; 25. Push rod seat; 26. Oval ring strip; 27. Tooth block; 28. Special-shaped tooth; 29. ​​Positioning ring groove; 210. Fixing rod; 211. Connecting rod;

[0027] 41. socket; 42. bolt seat plate; 43. fixing bolt; 44. flange; 45. long column; 46. tapered hole piece;

[0028] 51. transparent tube; 52. insert ring; 53. positioning bolt plate; 54. base; 55. special-shaped convex part;

[0029] 61. Motor seat; 62. Servo motor; 63. Limit shaft seat; 64. Built-in groove; 65. Shaft rod; 66. Movable block; 67. Limit spring; 68. Speed ​​fan; 69. Limit circular groove; 610. Ratchet groove. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0031] See also Figure 1In this embodiment, a corrosion-resistant pipe sight glass is provided, including a fixed base 1, a rate monitoring device 2 is fixedly installed at the right end of the rear side of the fixed base 1, a corresponding electric control box 3 is arranged on the rate monitoring device 2, pipe mirror seats 4 are symmetrically arranged at the upper and lower ends of the middle part of the right side of the fixed base 1, a pipe sight glass assembly 5 is arranged between the pipe sight glass seats 4, a movable rate adjustment assembly 6 is arranged in the middle of the pipe sight glass assembly 5, and the electric control box 3 can electrically control and drive the rate adjustment assembly 6.

[0032] like Figure 2 As shown, the rate monitoring device 2 includes a limit seat 21, a limit groove 22, a slide hole 23, a ring plate 24, a lever seat 25, an elliptical ring strip 26, a tooth block 27, a special-shaped tooth 28, a positioning ring groove 29, a fixing rod 210 and a connecting rod 211. The front end surface of the limit seat 21 is provided with a limit groove 22, and a smooth mirror is arranged inside the bottom of the limit groove 22 for reflecting light on the pipeline sight glass assembly 5, so as to facilitate the rate observation of the flowing medium in the pipeline sight glass assembly 5. A slide hole 23 is arranged in the middle of the right end surface of the limit seat 21, and a plurality of lever seats 25 are arranged along the edge of the slide hole 23 at the right end of the limit seat 21. A ring plate 24 is fixedly installed in the middle of the bottom of the limit groove 22. An elliptical ring strip 26 that can slide up and down is arranged inside 22, and a fixing rod 210 is fixedly installed at the right end of the elliptical ring strip 26. The fixing rod 210 passes through the sliding hole 23, and the fixing rod 210 can be used in coordination with the lever on the lever seat 25 for shifting. A plurality of tooth blocks 27 are symmetrically fixed to the middle part of the inner ring side of the elliptical ring strip 26, and a special-shaped tooth 28 is arranged on the middle side of the elliptical ring strip 26. The special-shaped tooth 28 forms a rack meshing with the tooth blocks 27 on both sides of the inner side of the elliptical ring strip 26. A positioning ring groove 29 is opened in the middle part of the rear end surface of the special-shaped tooth 28, and the positioning ring groove 29 is arranged to rotate corresponding to the ring plate 24. A connecting rod 211 is fixedly installed at the front end of the special-shaped tooth 28, and the connecting rod 211 is fixedly connected to the speed adjustment component 6.

[0033] like Figure 3 As shown, the pipe mirror seat 4 includes a sleeve seat 41, a bolt seat plate 42, a fixing bolt 43, a flange 44, a long column 45 and a tapered hole piece 46. The flange 44 is symmetrically arranged on the upper and lower ports of the arc surface at the right end of the fixed base 1. The tapered hole piece 46 is fixedly installed on the inner side of the flange 44. A sleeve seat 41 is arranged on the inner side of the flange 44. The tapered hole piece 46 is snap-fitted and arranged in the sleeve seat 41. The middle part of the ring side of the sleeve seat 41 is provided with a bolt seat plate 42 that is symmetrical front and back. A plurality of fixing bolts 43 are arranged on the bolt seat plate 42. A long column 45 is used to cooperate with the bolt nut between the flanges 44 to close together, so as to limit and tighten the pipe mirror assembly 5.

[0034] like Figure 4As shown, the pipeline sight glass assembly 5 includes a transparent tube 51, an insert ring 52, a positioning bolt plate 53, a base 54 and a special-shaped protrusion 55. The transparent tube 51 is a multi-angle air duct made of glass. The glass has good visualization ability, its own strength and activity are relatively stable, and it is not easy to produce chemical reactions, causing the pipeline to be corroded. The ports at both ends of the transparent tube 51 are fixedly connected to the insert ring 52. The insert ring 52 is engaged with the gap cavity formed by the tapered hole part 46 and the inner wall of the sleeve 41. The positioning bolt plates 53 are symmetrically arranged in the middle of the end ring side of the two ends of the transparent tube 51. The positioning bolt plates 53 and the bolts are fixedly connected. The seat plate 42 corresponds to the seat plate 42, and the positioning bolt plate 53 is fixed to the bolt seat plate 42 by the fixing bolt 43, so that the transparent tube 51 can be fixed on the borescope seat 4, which is convenient for subsequent rate monitoring. A base 54 is provided at the left side of the middle section of the transparent tube 51 in a sealed connection. The base 54 is used to limit the placement of the rate adjustment component 6. The middle section of the transparent tube 51 is symmetrically provided with special-shaped protrusions 55, so as to facilitate guiding the medium flowing in the transparent tube 51 to the rate adjustment component 6 for driving rotation, and then transmitting it to the rate monitoring device 2, so as to facilitate the monitoring of the flow rate of the medium.

[0035] like Figure 5 As shown, the speed adjustment component 6 includes a motor seat 61, a servo motor 62, a limit shaft seat 63, a built-in groove 64, a shaft rod 65, a movable block 66, a limit spring 67, a speed fan 68, a limit circular groove 69 and a ratchet groove 610. The motor seat 61 is fixed in the middle of the front right end of the fixed base 1, and the servo motor 62 is arranged on the motor seat 61. The limit shaft seat 63 is fixedly installed in the middle of the rear end of the servo motor 62. A plurality of built-in grooves 64 are annularly provided in the front of the outer wall of the limit shaft seat 63. The shaft rod 65 is fixedly installed in the built-in groove 64. A rotatable movable block 66 is sleeved on the shaft rod 65. A limit spring 67 is arranged on the lower side of the movable block 66. The other end of the limit spring 67 is arranged at the bottom of the built-in groove 64. A speed fan 68 is arranged on the rear side of the limit shaft seat 63. The speed fan 68 is arranged in the base 54. The rate fan 68 is fixedly connected to the connecting rod 211, and a limited circular groove 69 is provided in the middle of the rate fan 68. The limited circular groove 69 and the limited shaft seat 63 rotate accordingly. A ratchet groove 610 is provided on the front side of the inner wall of the limited circular groove 69. The ratchet groove 610 and the movable block 66 are provided with a corresponding conflict. The unidirectional rotation of the ratchet groove 610 can make the rate fan 68 move due to the pressure of the medium flow; through the elastic deformation ability of the limit spring 67, the movable block 66 will rotate around the shaft 65 and conflict in the ratchet groove 610, so that the servo motor 62 can be driven by the electric control box 3, so that the limited shaft seat 63 drives the rate fan 68 to rotate, and then pushes the flowing medium in the transparent tube 51 to prevent the blockage problem caused by slow medium flow rate or medium backlog.

[0036] The working principle of the present invention is:

[0037] When the present invention is used, the medium such as liquid, gas or steam to be observed flows in the transparent tube 51, and is guided by the special-shaped protrusions 55 on the front and rear sides. The flow of the medium directly presses the rate rotating fan 68 to rotate, and the rate rotating fan 68 drives the special-shaped teeth 28 at the rear end of the connecting rod 211 to rotate. Due to the limited rotation between the positioning ring groove 29 and the ring plate 24, the special-shaped teeth 28 rotate to engage the tooth block 27 of the elliptical ring strip 26 more stably. At this time, the elliptical ring strip 26 performs reciprocating directional movement in the limiting groove 22, and the fixed rod 210 slides in the sliding hole 23 accordingly, and the fixed rod 210 moves the levers of the multiple lever seats 25, and the lever seats 25 are equipped with corresponding sensors to move the levers. The data are collected at intervals to calculate the flow rate of the medium. Through intuitive data analysis, the medium in the pipeline can be operated to increase or decrease the supply accordingly to reduce accidents. Secondly, the servo motor 62 can be controlled by the electric control box 3 to drive the limit shaft seat 63 to rotate. Since the movable block 66 is deformed and stretched by the limit spring 67 in the built-in groove 64, it will rotate around the shaft rod 65 and then abut against the ratchet groove 610, so that the limit shaft seat 63 drives the speed fan 68 to rotate, thereby pushing the flowing medium in the transparent tube 51 to eliminate the blockage problem caused by slow medium flow rate or medium backlog, reduce the inconvenience of later maintenance, and reduce the corrosive effect caused by the gap after disassembly and assembly.

[0038] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A corrosion-resistant pipeline sight glass, comprising a fixed base (1), characterized in that: A speed monitoring device (2) is fixedly installed at the right end of the rear side of the fixed base (1), a corresponding electric control box (3) is arranged on the speed monitoring device (2), a pipeline mirror seat (4) is symmetrically arranged at the upper and lower ends of the middle part of the right side of the fixed base (1), a pipeline mirror assembly (5) is arranged between the pipeline mirror seats (4), a movable speed adjustment assembly (6) is arranged in the middle part of the pipeline mirror assembly (5), and the electric control box (3) electrically controls and drives the speed adjustment assembly (6); The speed monitoring device (2) comprises a limit seat (21), a limit groove (22), a sliding hole (23), a ring plate (24), a lever seat (25), an elliptical ring strip (26), a tooth block (27), a special-shaped tooth (28), a positioning ring groove (29), a fixing rod (210) and a connecting rod (211); the limit seat (21) has a limit groove (22) on its front end surface, a sliding hole (23) is provided in the middle of the right end surface of the limit seat (21), a plurality of lever seats (25) are provided at the right end of the limit seat (21) along the edge of the sliding hole (23), and an elliptical ring strip (26) which can slide up and down is provided in the limit groove (22). A fixing rod (210) is fixedly installed at the right end of the elliptical ring strip (26), the fixing rod (210) passes through the sliding hole (23), and the fixing rod (210) can be used in coordination with the lever on the lever seat (25) for shifting. A plurality of tooth blocks (27) are symmetrically fixed to the middle of the inner ring side of the elliptical ring strip (26), and a special-shaped tooth (28) is arranged on the middle side of the elliptical ring strip (26). The special-shaped tooth (28) and the tooth blocks (27) on both sides of the inner side of the elliptical ring strip (26) form a rack meshing, and a connecting rod (211) is fixedly installed at the front end of the special-shaped tooth (28), and the connecting rod (211) is fixedly connected to the speed adjustment component (6).

2. A corrosion-resistant pipe sight glass according to claim 1, characterized in that: A smooth mirror is arranged inside the bottom of the limiting groove (22) to reflect light on the pipeline sight glass assembly (5).

3. A corrosion-resistant pipe sight glass according to claim 1, characterized in that: A ring plate (24) is fixedly mounted in the middle of the bottom of the limiting groove (22), a positioning ring groove (29) is opened in the middle of the rear end surface of the special-shaped tooth (28), and the positioning ring groove (29) and the ring plate (24) are arranged to rotate correspondingly.

4. A corrosion-resistant pipe sight glass according to claim 1, characterized in that: The borescope seat (4) comprises a sleeve seat (41), a bolt seat plate (42), a fixing bolt (43), a flange (44), a long column rod (45) and a tapered hole piece (46); the flange (44) is symmetrically arranged on the upper and lower ends of the arc surface of the right end of the fixing base (1); the tapered hole piece (46) is fixedly installed on the inner side of the flange (44); the sleeve seat (41) is arranged on the inner side of the flange (44); and the tapered hole piece (46) is clamped and arranged in the sleeve seat (41).

5. A corrosion-resistant pipe sight glass according to claim 4, characterized in that: A bolt seat plate (42) symmetrically arranged in front and back is arranged in the middle of the ring side of the sleeve seat (41), a plurality of fixing bolts (43) are arranged on the bolt seat plate (42), and a long column rod (45) is used between the flanges (44) to cooperate with the bolt nut and close together.

6. The corrosion-resistant pipe sight glass according to claim 1, characterized in that: The pipeline sight glass assembly (5) comprises a transparent tube (51), an insert ring (52), a positioning bolt plate (53), a base (54) and a special-shaped protrusion (55); the transparent tube (51) is a multi-angle air duct made of glass.

7. A corrosion-resistant pipe sight glass according to claim 6, characterized in that: The two end ports of the transparent tube (51) are fixedly connected to the insert ring (52), and the insert ring (52) is engaged with the gap cavity formed by the tapered hole piece (46) and the inner wall of the sleeve (41).

8. The corrosion-resistant pipe sight glass according to claim 6, characterized in that: Positioning bolt plates (53) are symmetrically arranged in the middle of the end ring sides of both ends of the transparent tube (51), the positioning bolt plates (53) correspond to the bolt seat plates (42), and the positioning bolt plates (53) and the bolt seat plates (42) are fixed by fixing bolts (43), so that the transparent tube (51) can be fixed on the borescope seat (4). A base (54) is provided in a sealing connection on the left side of the middle section of the transparent tube (51), and the base (54) is used for limiting the placement of the speed adjustment component (6). Special-shaped protrusions (55) are symmetrically arranged in the middle section of the transparent tube (51).

9. The corrosion-resistant pipe sight glass according to claim 1, characterized in that: The speed adjustment component (6) comprises a motor seat (61), a servo motor (62), a limit shaft seat (63), an internal groove (64), a shaft rod (65), a movable block (66), a limit spring (67), a speed rotating fan (68), a limit circular groove (69) and a ratchet groove (610). The motor seat (61) is fixed at the middle of the front side of the right end of the fixed base (1). The servo motor (62) is arranged on the motor seat (61). The limit shaft seat (63) is fixedly installed at the middle of the rear end of the servo motor (62). A plurality of internal grooves (64) are annularly arranged at the front of the outer wall of the limit shaft seat (63). The shaft rod (65) is fixedly installed in the internal groove (64). A rotatable movable block (66) is sleeved on the shaft rod (65). A limit spring (67) is arranged at the lower side of the movable block (66). The other end of the limit spring (67) is arranged at the bottom of the internal groove (64).

10. The corrosion-resistant pipe sight glass according to claim 9, characterized in that: A speed rotating fan (68) is arranged at the rear side of the limit shaft seat (63), and the speed rotating fan (68) is arranged in the base (54). The speed rotating fan (68) is fixedly connected to the connecting rod (211), and a limit circular groove (69) is arranged in the middle of the speed rotating fan (68). The limit circular groove (69) rotates correspondingly to the limit shaft seat (63), and a ratchet groove (610) is arranged on the front side of the inner wall of the limit circular groove (69), and the ratchet groove (610) is arranged to be in conflict with the movable block (66).

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