CN114993101A

CN114993101A - Online scale removal device of evaporimeter

Info

Publication number: CN114993101A
Application number: CN202210414218.6A
Authority: CN
Inventors: 王泰锋; 黄永耀
Original assignee: Guangdong Gangrong Water Technology Co ltd
Current assignee: Guangdong Gangrong Water Technology Co ltd
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2022-09-02
Anticipated expiration: 2042-04-20
Also published as: CN114993101B

Abstract

The invention discloses an online descaling device for an evaporator, which comprises a track erected in the evaporator, pulleys mounted on the track, a supporting bracket hung between the pulleys and capable of moving in the evaporator along with the pulleys, a plurality of transmission brackets capable of being inserted between heat exchange tubes and arranged on the supporting bracket to drive a descaling device made of springs sleeved on each heat exchange tube to scrape scale along the surface of the heat exchange tube, and an output end of a hydraulic cylinder externally arranged outside the evaporator penetrates through the outer wall of the evaporator to push the supporting bracket to move.

Description

Online scale removal device of evaporimeter

Technical Field

The invention relates to the technical field of evaporator descaling, in particular to an online descaling device for an evaporator.

Background

The types of the existing evaporators comprise an MVR evaporator, a multi-effect evaporator, a waste water evaporator and the like, a heat exchange component in the evaporator is an important component for the operation of the evaporator, a device for transferring heat energy at different temperature fluid pieces is called as a heat exchanger, and the heat exchanger is divided into plate type and tube type heat exchange main bodies.

In practice, it is found that in the operation of the evaporator, liquid on the heating surface and the heat transfer surface of the heat exchange main body part can form crystal nuclei in the continuous evaporation and concentration process, the crystal nuclei can be attached to the surface of the heat exchange tube to form scale, the heat exchange efficiency is affected if the scale is accumulated day by day, and the normal operation of an evaporator unit is affected if the scale is heavy, so that great economic loss is caused. Although such a chemical cleaning method is effective for various deposits, it is also corrosive to metal parts, and easily causes corrosion of the pipelines of the equipment, and the discharge of waste liquid after cleaning causes environmental pollution. The traditional manual mechanical descaling is very time-consuming and labor-consuming, and the pipe wall is easily damaged in the descaling process. The two traditional methods have the common defect besides the respective defects, namely the two traditional methods need to be stopped, so that the long-time stop not only influences the normal working production, but also is easy to form scales in the standing process because the equipment is stopped for a long time, or the formed scales are difficult to remove and cause vicious circle.

Therefore, further optimization and improvement of the existing evaporator are needed.

Disclosure of Invention

The invention aims to provide a device capable of realizing efficient online descaling without stopping the machine.

In order to achieve the purpose, the invention adopts the following scheme: an online descaling device for an evaporator comprises guide rails symmetrically arranged on two sides of a heat exchange tube in the evaporator, sealing pulley assemblies capable of moving along the guide rails are respectively arranged on the guide rails, a bearing support is suspended between the two sealing pulley assemblies, the sealing pulley assemblies are respectively connected with the end parts of the bearing support through a suspension frame extending downwards, a plurality of transmission supports capable of longitudinally penetrating the side surfaces of the heat exchange tube are arranged on the bearing support, a descaling device capable of moving along the axial direction of the heat exchange tube is sleeved on the outer wall of the circumference of the heat exchange tube, a plurality of insertion holes corresponding to the descaling device are arranged on the transmission support, connecting rods capable of being inserted in the insertion holes are extended from the descaling device, one side of the transmission support is connected with a device capable of pushing the transmission support to move along the guide rails through the two sealing pulley assemblies, And the descaling device can further scrape dirt from the surface of the heat exchange tube along the driving part, so that the effect of online descaling without shutdown can be achieved, and various problems caused by shutdown of descaling can be reduced.

As a further scheme of the invention, the insertion hole is a rectangular hole, the connecting rod is arranged on one side of the scale remover facing the direction of the transmission support, one end of the connecting rod is movably inserted into the insertion hole, the connecting rod can move up and down in the insertion hole, and the position of the connecting rod can be adjusted up and down when the scale remover encounters scale deposit or welding spots which are deformed or cannot be removed by a pipeline, so that the problem that the whole scale remover is integrally clamped due to blockage of one person or a plurality of positions is further prevented, and meanwhile, the bending of part of the heat exchange tube caused by the scale remover is avoided.

Preferably, the sealed pulley assembly comprises a pulley body in a wheel shape, bearings are symmetrically arranged in the axis of the pulley body, a bearing gasket capable of separating the bearings is arranged between the two bearings, an axle is arranged on the axis of the two bearings in a penetrating manner, the left end and the right end of the axle respectively protrude out of the pulley body, first rubber ring grooves surrounding the outer wall of the axle are respectively arranged at the positions where the axle protrudes out of the pulley body, first sealing rings are arranged in the first rubber ring grooves, the inner sides of the first sealing rings are accommodated in the axis of the pulley body, the outer sides of the first sealing rings are exposed out of the pulley body, pulley cover plates, pulley pressing plates, water blocking cover plates and sealing rings are respectively and sequentially arranged at the left side and the right side of the pulley body, the pulley cover plates are respectively provided with a hole capable of allowing the end of the axle to pass through, the pulley pressing plates and the water blocking cover plates and the sealing rings enable the pulley to be at high temperature for a long time, The corrosion is avoided in a high-corrosion environment; the pulley cover plate is covered on the pulley body by penetrating bolts along the outer wall of the circumference and covers the axis of the pulley body; the pulley pressing sheet is embedded in a central axis hole of the pulley cover plate, the circumferential inner wall of the inner circle of the pulley pressing sheet is attached to the circumferential outer wall of the outward side of the first sealing ring, a concave second rubber ring groove is arranged on the circumferential inner wall of the embedded part of the pulley cover plate and the pulley pressing sheet, a second sealing rubber ring which is attached to the circumferential outer wall of the pulley pressing sheet in a surrounding manner is arranged in the second rubber ring groove, a boss is formed on the outward side of the pulley pressing sheet in a surrounding manner of the inner circular hole in a protruding manner, the hole in the center of the water retaining cover plate is sleeved on the boss, a clamping edge which extends towards the pulley cover plate is arranged at the circumferential outer edge of the water retaining cover plate, an annular clamping groove is arranged on the outward wall surface of the pulley cover plate in a recessed manner, the annular clamping groove is surrounded outside the pulley pressing sheet, the clamping edge is clamped in the annular clamping groove, and pulley back plates which can be sleeved on a wheel shaft are respectively arranged at the left end and the right end of the wheel shaft, the pulley backplate is equipped with the fixed slot of indent on one side wall of pulley backplate, the shaft is pegged graft in the fixed slot, is located the fixed bottom plate stationary blade that is equipped with of one end of fixed slot at the pulley backplate, and the bottom plate stationary blade is last to be equipped with a plurality of bolt holes that can wear to establish bolt and shaft end connection along the circumference, the pulley backplate with it is fixed through bolt interconnect to suspend in midair, through above-mentioned scheme, can let the online scale removal device of evaporimeter freely round trip movement in the evaporimeter, has guaranteed the stable smooth normal work of the online scale removal device of evaporimeter.

As a further scheme of the invention, the descaler comprises a first descaling part and a second descaling part which are spirally sleeved on the circumferential outer wall of the heat exchange tube and are mutually connected, a connecting rod is arranged at the joint of the first descaling part and the second descaling part, the spiral pitch of the first descaling part is larger than that of the second descaling part, and the descaler is composed of two springs with different pitches.

As a preferable scheme of the present invention, the first descaling part and the second descaling part are coil springs, and the cross section of the spring wire is square, which is more favorable for scraping scale.

As a preferable scheme of the invention, a gap is formed between the inner diameter of the spiral spring and the outer circumferential wall surface of the heat exchange tube, so that the pipe wall of the heat exchange tube is prevented from being damaged due to direct friction of the scaler on the pipe wall.

As a further aspect of the present invention, the driving member includes a hydraulic cylinder disposed outside the evaporator and a connecting seat connected to the supporting bracket, and the output end of the hydraulic cylinder is connected to the connecting seat.

As a further scheme of the invention, an outer fixed seat capable of being fixedly connected with the front end of the cylinder barrel of the hydraulic cylinder is arranged on the outer wall of the evaporator, an inner fixed seat capable of being connected with the outer fixed seat through a penetrating bolt is arranged on the inner wall of the evaporator, a connector is arranged at the head end part of the piston rod of the hydraulic cylinder and is connected with the connecting seat, the outer fixed seat and the inner fixed seat are matched with each other to fix the hydraulic cylinder, and the piston rod of the closed hydraulic cylinder penetrates through the inner wall of the evaporator to prevent internal steam from leaking.

Preferably, the connecting base is a hollow column which is vertically arranged, a notch is formed in a side wall surface facing the direction of the inner fixing base, the connecting head is a hook-shaped piece with a downward opening, and the connecting head is hooked on the inner wall of the connecting base at the position of the notch.

As a preferable scheme of the invention, the concave groove is arranged on the surface of the traveling wheel surrounding the pulley body, the convex rib is fixed on the upper surface of the guide rail and inserted into the groove, and the traveling direction of the pulley body can be corrected through the matching of the convex rib and the groove, so that the pulley body is prevented from being separated from the guide rail after being deviated.

In summary, compared with the prior art, the invention has the beneficial effects that: the invention can achieve the effect of online descaling without shutdown and reduce various problems caused by descaling shutdown by the scheme that the output end of a hydraulic cylinder externally arranged outside the evaporator penetrates through the outer wall of the evaporator to push the bearing support to move.

Wherein the descaler of constituteing by the different spring of two sections pitches, because coil spring wire cross-section is squarely more to be favorable to scraping the scale deposit, can discharge massive structure after the great one end of anterior segment pitch can be broken the scale deposit in the different spring of two sections pitches, the little spring of one section pitch of back can further be with remaining scale deposit clean up, the scale deposit after can not appearing scraping is because there is not the very first time discharge to block in the descaler, leads to whole descaling equipment to be blocked the card and dies, the problem of unable removal.

In addition, the rectangular insertion holes in the transmission support can be adjusted vertically when the descaling device meets scaling or welding spots caused by pipeline deformation or incapability of removing, so that the problem that the whole descaling device is integrally blocked after being blocked by one person or a plurality of positions is further prevented, and meanwhile, the phenomenon that part of heat exchange tubes are bent due to the descaling device is avoided.

And secondly, the wheel cover plates, the pulley pressing plates, the water retaining cover plates and the sealing rings in the pulley cover plates on the two sides of the pulley can prevent the pulley from being corroded in a high-temperature and high-corrosion environment for a long time, and can still normally and smoothly slide.

Drawings

Fig. 1 is a front sectional view of the present invention and a partially enlarged view thereof.

Fig. 2 is a side sectional view of the present invention and a partially enlarged view thereof.

Fig. 3 is a schematic view illustrating the connection between the sealing pulley assembly and the suspension bracket according to the present invention.

Fig. 4 is one of the exploded views of the sealing sheave assembly of the present invention.

Fig. 5 is a second exploded view of the sealing sheave assembly of the present invention.

FIG. 6 is a sectional view of the scale remover according to the present invention.

FIG. 7 is a perspective view of the scale remover according to the present invention.

Detailed Description

The following detailed description provides many different embodiments or examples for implementing the invention. Of course, these are merely embodiments or examples and are not intended to be limiting. In addition, repeated reference numbers such as repeated numbers and/or letters may be used in different embodiments. These iterations are provided for simplicity and clarity of the description of the invention and are not intended to suggest any particular relationship between the various embodiments and/or configurations discussed.

Furthermore, spatially relative terms, such as "below" … "," below "," inside-out "," above "," upper "and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature during use or operation of the device, and may include different orientations of the device during use or operation of the device as illustrated in the figures. The devices may be rotated 90 degrees or other orientations from different orientations and the spatially relative descriptors used therein should be interpreted as such and are not to be construed as limiting the invention, and the terms "first" and "second" are used for descriptive purposes only and are not intended to indicate or imply relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

The invention will be further described with reference to the following description and embodiments in conjunction with the accompanying drawings: as shown in fig. 1 to 7, an online descaling device for an evaporator includes guide rails 100 symmetrically disposed at two sides of a heat exchange tube 202 inside an evaporator 200, the guide rails 100 are erected along the length of the evaporator 200, in this embodiment, a triangular rib 101 is fixed on the upper surface of the guide rail 100, sealing pulley assemblies 2 capable of moving along the guide rails 100 are respectively disposed on the guide rails 100, the triangular rib 101 at the top of the guide rail 100 can be disposed on both the guide rails or on one of the guide rails, which is used for better guiding the sealing pulley assemblies 2 to move along the guide rails 100, a support bracket 1 is suspended between the two sealing pulley assemblies 2, in this embodiment, the support bracket 1 is located at the center of the evaporator 200 and is shaped like a square frame, a plurality of cross bars 11 are connected at the center, and the heat exchange tubes 202 are disposed at the upper and lower sides of the support bracket 1, the sealing pulley assembly 2 is respectively connected with the end parts of the bearing supports 1 through the suspension frames 10 extending downwards, each pulley is clamped in the middle by two suspension frames 10, the two suspension frames 10 respectively extend downwards from the left side and the right side of the guide rail 100 and are connected and fixed with the bearing supports 1, a plurality of transmission supports 3 capable of longitudinally penetrating the side surfaces of the heat exchange tube are arranged on the cross rod 11 of the bearing supports 1, in the embodiment, the transmission supports 3 are respectively arranged at the top and the bottom of the cross rod 11 of the bearing supports 1 at intervals along the length direction of the bearing supports 1, the transmission supports 3 are made of rectangular sheet steel plates, the outer wall of the circumference of the heat exchange tube 202 is sleeved with a scaler 4 which is in a spiral shape and can axially move along the heat exchange tube, a plurality of insertion holes 31 corresponding to the scaler 4 are arranged on the transmission supports 3, the insertion holes 31 are rectangular holes, and one side of the scaler 4 facing the direction of the transmission supports 3 is provided with a connecting rod 43, One end of the plug hole 31 is movably inserted into the plug hole 31 and moves up and down in the plug hole 31, the plug hole 31 is symmetrically arranged into two corresponding to each layer of heat exchange tube 202 in the embodiment, one plug hole 31 corresponds to the left heat exchange tube 202 and is used for being plugged and sleeved on the scale remover 4 on the left heat exchange tube 202, and the other plug hole 31 corresponds to the right heat exchange tube 202 and is used for being plugged and sleeved on the scale remover 4 on the right heat exchange tube 202; a driving part 5 which can push the transmission bracket 3 and move along the guide rail 100 by the two sealing pulley assemblies 2 so as to enable the scaler 4 to scrape dirt along the surface of the heat exchange tube 202 is connected to one side of the transmission bracket 3.

As shown in fig. 1 to 5, the sealing pulley assembly 2 includes a wheel-shaped pulley body 20, a concave groove 201 is formed around a traveling wheel surface of the pulley body 20, a rib 101 on the guide rail 100 is inserted into the groove 201 to limit the pulley body 20 from deviating from the guide rail 100 to travel along the guide rail 100, two coaxial bearings 21 are symmetrically disposed in an axis of the pulley body 20, a bearing washer 22 capable of separating the bearings 21 is disposed between the two bearings 21, the axes of the two bearings 21 are penetrated through by a wheel axle 23, left and right ends of the wheel axle 23 protrude out of the pulley body 20, first rubber ring grooves 231 surrounding an outer wall of the wheel axle 23 are disposed at positions where the wheel axle 23 protrudes out of the pulley body 20, that is, the outer wall of the pulley body 20 is aligned with the center of the first rubber ring grooves 231, first sealing rings 232 are disposed in the first rubber ring grooves 231, the inner side of the first sealing ring 232 is accommodated in the axle center of the pulley body 20, the outer side of the first sealing ring 232 is exposed out of the pulley body 20, and the left side and the right side of the pulley body 20 are respectively and sequentially provided with a pulley cover plate 24, a pulley pressing plate 25 and a water retaining cover plate 26, wherein the pulley cover plate can be sleeved at the end part of the axle 23, and the axle center is provided with a hole for allowing the end part of the axle 23 to pass through; the pulley cover plate 24 is covered on the side wall of the pulley body 20 by penetrating a plurality of bolts along the circumferential outer wall and covers the axis of the pulley body 20, the hole of the axis of the pulley cover plate 24 is aligned with the axis of the pulley body 20, and the end part of the wheel shaft 23 passes through the hole of the axis of the pulley cover plate 24; the pulley preforming 25 is embedded in the central axle center hole of pulley apron 24 to pulley preforming 25 one side laminating is in the bearing 21 outside, the circumference inner wall of the interior circle of pulley preforming 25 central hole with the circumference outer wall of the outside one side of first sealing washer 232 is laminated mutually, promptly: first sealing washer 232 can seal the clearance between pulley preforming 25 central hole and shaft 23 simultaneously be equipped with the second rubber ring groove 241 of indent on the circumference inner wall of pulley apron 24 and the gomphosis of pulley preforming 25 mutually, install in second rubber ring groove 241 and encircle the laminating at the second sealed rubber ring 242 of pulley preforming 25 circumference outer wall, promptly: the second sealing rubber ring 242 can seal the gap between the pulley pressing piece 25 and the pulley cover plate 24, the wheel shaft and the inner bearing 21 are sealed by the first sealing ring 232 and the second sealing rubber ring 242, so as to prevent water vapor and corrosive gas from entering the pulley body 20, the inner wheel shaft 23 and the inner bearing 21 are corroded to generate rust or rot, a boss 251 is formed around the outward side of the pulley pressing piece 25, the boss 251 is formed by protruding the inward hole, the hole in the center of the water-blocking cover plate 26 is sleeved on the boss 251, the clamping edge 261 extending towards the pulley cover plate 24 is arranged at the circumferential outer edge of the water-blocking cover plate 26, an annular clamping groove 243 is arranged on the outward wall surface of the pulley cover plate 24 in a recessed manner, the annular clamping groove 243 surrounds the pulley pressing piece 25, waterproof glue is filled in the annular clamping groove 243, and the clamping edge 251 is clamped in the annular clamping groove 243, the pulley cover plate 24 is provided with two annular deep grooves 120 at intervals at the periphery of an axis hole at the side surface, a waterproof rubber ring or a filling waterproof rubber ring is arranged in the deep groove 120 to further prevent liquid from entering the wheel shaft 23 at the axis of the pulley body 20 and prevent the bearing 21 from being corroded, the left end and the right end of the wheel shaft 23 are respectively provided with a pulley back plate 27 capable of being sleeved on the wheel shaft 23, a fixing groove 271 is concavely arranged on one side wall surface of the pulley back plate 27, the wheel shaft 23 is inserted in the fixing groove 271, one end of the pulley back plate 27, which is positioned at the fixing groove 271, is fixedly provided with a bottom plate fixing plate 28, a plurality of bolt holes 281 capable of penetrating through bolts to be connected with the end part of the wheel shaft 23 are arranged on the bottom plate fixing plate 28 along the circumference, and the pulley back plate 27 and the corresponding suspension frame 10 are mutually connected and fixed through bolts.

In addition, as shown in fig. 1, 2, 6 and 7, the descaler 4 includes a first descaling part 41 and a second descaling part 42 spirally sleeved on the outer circumferential wall of the heat exchange tube 202 and connected to each other, a connecting rod 43 is disposed at the connection position of the first descaling part 41 and the second descaling part 42, the spiral pitch of the first descaling part 41 is greater than the spiral pitch of the second descaling part 42, the first descaling part 41 and the second descaling part 42 are coil springs, the cross section of the spring wire is square, a gap 44 is formed between the inner diameter of the coil spring and the outer circumferential wall surface of the heat exchange tube 202, and the size of the gap 44 can be referred to as follows: for example, the outer diameter of the heat exchange tube 202 is 19MM, the inner diameter of the coil spring of the descaling device 4 needs to reach 21 MM to 21.5MM, and important descriptions are as follows: the first descaling part 41 has a larger pitch, so that after the scale is broken, the large scale can be firstly discharged and dropped from the larger pitch, and then the second descaling part 42 with a smaller pitch can better crush the rest of the scale which is not cleaned and discharged from the pitch because of the dense spiral of the second descaling part, compared with the tubular descaling device, the coil spring can effectively prevent the scale or the broken scale which is scraped off from blocking the inner wall of the tubular descaling device to cause the blockage, and the gap 44 acts on: the pipe wall damage caused by the direct friction of the scaler 4 on the pipe wall of the heat exchange pipe 202 is prevented, the coil spring can be adjusted flexibly by matching with the connecting rod 43, and the situation that the whole descaling device is blocked or the pipe is pulled to deform to cause larger loss due to the fact that the scaler 4 cannot be adjusted freely when encountering the deformation of the pipe or the scale or welding spot which cannot be removed is prevented, for example, after one heat exchange pipe is bent downwards partially, when the scaler 4 formed by the coil spring moves to the position, the position can be adjusted by floating up and down automatically, the connecting rod 43 cannot cause the situation that the coil spring cannot shake due to the rectangular inserting hole 31, the blockage phenomenon of the scaler is effectively prevented, the front end of the first descaling part 41 and the tail end of the second descaling part 42 are in a complete ring shape and are parallel to the connecting rod 43, and the end in the complete ring shape can effectively enhance the rigidity of the scaler 4, and the end part of the scale is clamped between the spiral pitches, so that the scale cleaning effect is reduced.

Finally, as shown in fig. 2, in the present embodiment, the driving member 5 includes a hydraulic cylinder 51 disposed outside the evaporator and a connecting seat 51 connected to the supporting bracket 1, and the output end of the hydraulic cylinder 51 is connected to the connecting seat 51, specifically: an outer fixing seat 52 which can be fixedly connected with the front end of a cylinder barrel of the hydraulic cylinder 51 is arranged on the outer wall of the evaporator, an inner fixing seat 53 which can be connected with the outer fixing seat 52 through a penetrating bolt is arranged on the inner wall of the evaporator 200, the output end of the hydraulic cylinder 51, namely the head end of a piston rod of the hydraulic cylinder penetrates through the outer fixing seat 52, a connector 54 is arranged at the head end part of the piston rod of the hydraulic cylinder 51, a plurality of oil seal gaskets are arranged at the position where the head end of the piston rod of the outer fixing seat 52 penetrates, the connector 54 is matched with the inner fixing seat 53 to prevent the gas in the evaporator from being exposed from the position where the piston rod of the hydraulic cylinder 51 extends, the sealing performance of the evaporator body is ensured, the connector 54 is a hook-shaped piece with a downward opening, the connecting seat 51 is a hollow column which is vertically arranged, a notch 511 is arranged on one side wall surface facing the direction of the inner fixing seat 53, and the connector 54 is hooked on the inner wall of the connecting seat 51 at the notch 511, a protective cover 55 which can cover the connector 54 and prevent the connector 54 from being corroded by liquid spray is also arranged on the wall surface of the inner fixed seat 53 facing the direction of the connecting seat 51.

While there have been shown and described what are at present considered to be the fundamental and essential features of the invention and advantages thereof, it will be understood by those skilled in the art that the invention is not limited by the details of the foregoing embodiments, which are provided as an illustration of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as hereinafter claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. An online descaling device for an evaporator is characterized by comprising guide rails (100) which are symmetrically arranged at two sides of a heat exchange tube in the evaporator, sealing pulley assemblies (2) capable of moving along the guide rails (100) are respectively arranged on the guide rails (100), a bearing support (1) is suspended between the two sealing pulley assemblies (2), the sealing pulley assemblies (2) are respectively connected with the end parts of the bearing support (1) through suspension frames (10) extending downwards, a plurality of transmission supports (3) capable of longitudinally penetrating through the side surfaces of the heat exchange tube are arranged on the bearing support (1), a descaling device (4) which is spiral and capable of axially moving along the heat exchange tube is sleeved on the circumferential outer wall of the heat exchange tube, a plurality of insertion holes (31) corresponding to the descaling devices (4) are arranged on the transmission supports (3), and connecting rods (43) capable of being inserted in the insertion holes (31) extend out of the descaling device (4), and one side of the transmission bracket (3) is connected with a driving part (5) which can push the transmission bracket (3) to move along the guide rail (100) by virtue of the two sealing pulley assemblies (2) so as to enable the scaler (4) to scrape dirt along the surface of the heat exchange tube.

2. The on-line descaling device for the evaporator according to claim 1, wherein the insertion hole (31) is a rectangular hole, the connecting rod (43) is arranged at one side of the descaling device (4) facing the direction of the transmission bracket (3) and one end of the connecting rod is movably inserted into the insertion hole (31), and the connecting rod (43) can move up and down in the insertion hole (31).

3. The online descaling device for the evaporator according to claim 1, wherein the sealing pulley assembly (2) comprises a pulley body (20) in a wheel shape, bearings (21) are symmetrically arranged in the axis of the pulley body (20), a bearing washer (22) capable of separating the bearings (21) is arranged between the two bearings (21), an axle (23) is arranged through the axis of the two bearings (21), the left and right ends of the axle (23) respectively protrude out of the pulley body (20), first rubber ring grooves (231) surrounding the outer wall of the axle (23) are respectively arranged at the positions of the axle (23) protruding out of the pulley body (20), first sealing rings (232) are arranged in the first rubber ring grooves (231), the inner sides of the first sealing rings (232) are accommodated in the axis of the pulley body (20), and the outer sides of the first sealing rings (232) are exposed out of the pulley body (20), the left side and the right side of the pulley body (20) are respectively and sequentially provided with a pulley cover plate (24), a pulley pressing sheet (25) and a water retaining cover plate (26), wherein the pulley cover plate is sleeved at the end part of the wheel shaft (23), and the axle center is provided with a hole for allowing the end part of the wheel shaft (23) to pass through; the pulley cover plate (24) is covered on the pulley body (20) by penetrating bolts along the circumferential outer wall and covers the axis of the pulley body (20); the pulley pressing plate (25) is embedded in a central axis hole of the pulley cover plate (24), the inner circumferential wall of the inner circle of the pulley pressing plate (25) is attached to the outer circumferential wall of the outward side of the first sealing ring (232), a concave second rubber ring groove (241) is arranged on the inner circumferential wall of the embedded pulley cover plate (24) and the pulley pressing plate (25), a second sealing rubber ring (242) which can be attached to the outer circumferential wall of the pulley pressing plate (25) in a surrounding manner is arranged in the second rubber ring groove (241), a boss (251) is formed in the outward side of the pulley pressing plate (25) in a surrounding manner of the inner circular hole in a protruding manner, the hole in the center of the water retaining cover plate (26) is sleeved on the boss (251), a clamping edge (261) extending towards the pulley cover plate (24) is arranged at the outer edge of the circumference of the water retaining cover plate (26), and an annular clamping groove (243) is arranged in a recessed manner on the outward wall surface of the pulley cover plate (24), the pulley clamping device is characterized in that an annular clamping groove (243) is surrounded outside a pulley pressing plate (25), a clamping edge (261) is clamped in the annular clamping groove (243), pulley back plates (27) which can be sleeved on a wheel shaft (23) are arranged at the left end and the right end of the wheel shaft (23) respectively, a fixing groove (271) is concavely arranged on one side wall surface of each pulley back plate (27), the wheel shaft (23) is inserted into the fixing groove (271), a bottom plate fixing plate (28) is fixedly arranged at one end, located at the fixing groove (271), of each pulley back plate (27), a plurality of bolt holes (281) capable of penetrating through bolts to be connected with the end portions of the wheel shaft (23) are arranged on the bottom plate fixing plate (28) along the circumference, and the pulley back plates (27) and the suspension frame (10) are fixedly connected through the bolts.

4. The online descaling device for evaporators according to claim 2, wherein the descaling device (4) comprises a first descaling part (41) and a second descaling part (42) which are spirally sleeved on the outer wall of the circumference of the heat exchange tube and are connected with each other, a connecting rod (43) is arranged at the joint of the first descaling part (41) and the second descaling part (42), and the spiral pitch of the first descaling part (41) is greater than that of the second descaling part (42).

5. An on-line descaling device for evaporator according to claim 4, wherein the first descaling part (41) and the second descaling part (42) are coil springs, and the cross-section of the spring wires is square.

6. An evaporator on-line descaling device according to claim 5, wherein a gap (44) is formed between the inner diameter of the coil spring and the outer circumferential wall surface of the heat exchange pipe.

7. An on-line descaling device for evaporators according to any of claims 1 to 6, characterized in that the driving member (5) comprises a hydraulic cylinder (51) disposed outside the evaporator and a connecting seat (51) connected to the supporting bracket (1), and the output end of the hydraulic cylinder (51) is connected to the connecting seat (51).

8. The online descaling device for the evaporator according to claim 7, wherein an outer fixing seat (52) capable of being fixedly connected with the front end of the cylinder barrel of the hydraulic cylinder (51) is arranged on the outer wall of the evaporator, an inner fixing seat (53) capable of being connected with the outer fixing seat (52) through a bolt is arranged on the inner wall of the evaporator, a connector (54) is arranged at the head end of the piston rod of the hydraulic cylinder (51), and the connector (54) is connected with the connecting seat (51).

9. An on-line descaling device for evaporators according to claim 8, wherein the connecting seat (51) is a vertically arranged hollow column, a notch (511) is formed on one side wall surface facing the direction of the inner fixed seat (53), the connecting head (54) is a hook-shaped member with a downward opening, and the connecting head (54) is hooked on the inner wall of the connecting seat (51) at the position of the notch (511).

10. The on-line descaling device for the evaporator according to claim 4, wherein the traveling wheel surface surrounding the pulley body (20) is provided with an inward-concave groove (201), the upper surface of the guide rail (100) is fixed with a rib (101), and the rib (101) is inserted into the groove (201).