CN114993101B - Online descaling device of evaporator - Google Patents

Abstract

The invention discloses an online descaling device for an evaporator, which comprises a rail erected in the evaporator, pulleys are arranged on the rail, a supporting bracket is suspended between the pulleys and moves along with the pulleys in the evaporator, a plurality of transmission brackets which can be inserted between heat exchange pipes are arranged on the supporting bracket to drive a scale remover made of springs sleeved on each heat exchange pipe to scrape scale along the surfaces of the heat exchange pipes, and an output end of a hydraulic cylinder arranged outside the evaporator passes through the outer wall of the evaporator to push the supporting bracket to move.

Description

Online descaling device of evaporator

Technical Field

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

Background

The type of the existing evaporator comprises an MVR evaporator, a multi-effect evaporator, a waste water evaporator and the like, and a heat exchange component in the evaporator is an important component for the operation of the evaporator, and a device for transferring heat energy through fluid components at different temperatures is called a heat exchanger, wherein the heat exchanger is divided into plate type heat exchange bodies, tubular type heat exchange bodies and the like.

In practice, it is found that in the operation of the evaporator, the liquid on the heating surface and the heat transfer surface of the heat exchange main body component forms crystal nuclei in the continuous evaporation and concentration process, the crystal nuclei adhere to the surface of the heat exchange tube to form scale, the heat exchange efficiency is affected when the scale is accumulated in daily life, the normal operation of the evaporator unit is affected when the scale is heavy, and the large economic loss is caused. Although such a method of chemical cleaning is effective for various depositions, it is also corrosive to metal parts, corrosion of equipment pipelines is likely to occur, and environmental pollution is caused by the discharge of waste liquid after cleaning. The traditional manual mechanical descaling is very time-consuming and labor-consuming, and the pipe wall is easily damaged in the descaling process. In addition to the respective disadvantages, the two conventional methods have a common disadvantage that they require a shutdown, which not only affects normal working production, but also causes a vicious circle because the equipment is deactivated for a long time, scale is more easily formed during the standing process, or the formed scale is more difficult to remove.

Therefore, further optimization improvements are needed for existing evaporators.

Disclosure of Invention

The invention aims to provide an on-line descaling device capable of being stopped and efficient.

In order to achieve the above purpose, the present invention adopts the following scheme: the utility model provides an online scale removal device of evaporimeter, includes the guide rail that is located heat exchange tube bilateral symmetry in the evaporimeter inside, is provided with respectively on the guide rail and can follow the sealed pulley subassembly that the guide rail removed, it has the bearing support to hang between two sealed pulley subassembly, sealed pulley subassembly through downwardly extending's suspension frame respectively with the tip of bearing support be connected be equipped with a plurality of transmission supports that vertically alternate in the heat exchange tube side on the bearing support, heat exchange tube circumference outer wall cover is equipped with and is spiral form, and can follow the scale remover that heat exchange tube axial moved be equipped with a plurality of correspondence on the transmission support the spliced eye of scale remover, extend on the scale remover and be pegged graft the connecting rod in the spliced eye one side of transmission support is connected with and can promote the transmission support and remove along the guide rail by two sealed pulley subassembly, and then make the scale remover is along the drive part of heat exchange tube surface scale removal, can reach through above-mentioned scheme just can be on-line scale removal effect, reduce because the scale removal is shut down.

As a further scheme of the invention, the plug hole is a rectangular hole, the connecting rod is arranged at one side of the scaler facing the direction of the transmission bracket, one end of the connecting rod is movably inserted into the plug hole, the connecting rod can move up and down in the plug hole, and the position of the connecting rod can be adjusted up and down when the scaler encounters scaling or welding spots which are deformed or cannot be removed by a pipeline, so that the problem that the whole scaler is blocked integrally after one or a plurality of positions occurs is further prevented, and meanwhile, the bending of part of heat exchange pipes caused by the scaler is avoided.

As a preferable scheme of the invention, the sealed pulley assembly comprises a pulley body with a pulley shape, bearings are symmetrically arranged in the axle center of the pulley body, bearing gaskets capable of separating the bearings are arranged between the two bearings, the axle center of the two bearings is penetrated with a wheel axle, the left end and the right end of the wheel axle are respectively protruded out of the pulley body, the positions of the wheel axle protruded out of the pulley body are respectively provided with a first rubber ring groove surrounding the outer wall of the wheel axle, a first sealing ring is arranged in the first rubber ring groove, the inner side of the first sealing ring is accommodated in the axle center of the pulley body, the outer side of the first sealing ring is exposed out of the pulley body, the left side and the right side of the pulley body are respectively provided with a pulley cover plate, a pulley cover plate and a water blocking cover plate which are sleeved at the axle center and can enable the end of the wheel axle to pass through required holes, and the sealing rings in the pulley cover plate can enable the pulley to be in a high-temperature and high-corrosion environment for a long time and not to be corroded; the pulley cover plate is covered on the pulley body by penetrating bolts along the circumferential outer wall and covers the axle center of the pulley body; the pulley preforming embeds the center axle center hole department of pulley apron, the circumference inner wall in pulley preforming in with the circumference outer wall of first sealing washer outside is laminated mutually pulley apron and pulley preforming are equipped with the second rubber ring groove of indent on the circumference inner wall of jogging mutually, install the second sealed rubber ring that can encircle laminating at pulley preforming circumference outer wall in the second rubber ring inslot pulley preforming outside one side encircles interior round hole convex and is formed with the boss, manger plate apron central hole cover is established on the boss, manger plate apron circumference outer fringe department is equipped with the block limit that extends to pulley apron direction the recessed annular block groove that is equipped with on the wall surface of pulley apron towards outside encircles outside the block limit block is in annular block groove the left and right sides of shaft is equipped with respectively and can cup joints the epaxial pulley backplate of wheel, and the concave fixed slot that is equipped with on one side wall surface of pulley backplate, the shaft is pegged graft in the fixed slot, is located the fixed bottom plate that is equipped with the fixed plate in one end of fixed slot of pulley backplate, and is equipped with a plurality of wear to establish along the circumference and can make a round trip to make perfect and the evaporation device through the steady joint with the wire hanger in the line end, the steady joint can make a round trip to the normal with the evaporator.

As a further scheme of the invention, the scale remover comprises a first scale removing part and a second scale removing 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 scale removing part and the second scale removing part, the spiral pitch of the first scale removing part is larger than that of the second scale removing part, and the scale remover composed of two sections of springs with different pitches is capable of discharging a massive structure after crushing and scaling due to the fact that one end with a larger front section pitch of the two sections of springs with different pitches can further clean a residual structure, and the problem that scaling after scraping is blocked in the scale remover due to the fact that the whole scale removing equipment is not discharged and blocked in the scale remover in the first time is avoided.

As a preferable scheme of the invention, the first descaling part and the second descaling part are spiral springs, and the cross section of the spring wire is square, so that scaling is scraped off more conveniently.

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

As a further proposal of the invention, the driving part comprises a hydraulic cylinder arranged outside the evaporator and a connecting seat connected with the bearing bracket, and the output end of the hydraulic cylinder is connected with the connecting seat.

As a further scheme of the invention, an outer fixing seat which can be connected and fixed with the front end of the cylinder barrel of the hydraulic cylinder is arranged on the outer wall of the evaporator, an inner fixing seat which can be connected with the outer fixing seat through a penetrating bolt is arranged on the inner wall of the evaporator, a connector is arranged at the head end part of a piston rod of the hydraulic cylinder, the connector is connected with the connector, the outer fixing seat and the inner fixing seat are mutually matched 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 leakage.

As a preferable scheme of the invention, the connecting seat is a hollow column which is vertically arranged, a notch is arranged on one side wall surface facing the direction of the inner fixing seat, 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 seat at the notch position.

As a preferable scheme of the invention, the running wheel surface surrounding the pulley body is provided with a concave groove, the upper surface of the guide rail is fixedly provided with a convex rib, the convex rib is inserted into the groove, and the running direction of the pulley body can be corrected through the cooperation of the convex rib and the groove, so that the pulley body is prevented from deviating and then is separated from the guide rail.

In summary, compared with the prior art, the invention has the following beneficial effects: according to the invention, the track is erected in the evaporator, the pulleys are arranged on the track, the supporting bracket is suspended between the pulleys to move along with the pulleys in the evaporator, the plurality of transmission brackets which can be inserted between the heat exchange pipes are arranged on the supporting bracket to drive the scale remover which is sleeved on each heat exchange pipe and is made of the springs to scrape scale along the surface of the heat exchange pipe, and then the output end of the hydraulic cylinder which is arranged outside the evaporator passes through the outer wall of the evaporator to push the supporting bracket to move.

The scale remover composed of the springs with different pitches in two sections is more beneficial to scraping the scale, one end of the spring with different pitches in the two sections, which is larger in the front section, can break the scale and then discharge the massive structure, the spring with small pitch in the rear section can further clean the residual scale, and the problem that the whole scale removing equipment is blocked and cannot move due to the fact that the scraped scale is not blocked in the scale remover because of no first time discharge is avoided.

In addition, the rectangular inserting holes on the transmission support can be used for adjusting the positions up and down when the scale remover encounters pipeline deformation or scaling or welding spots which cannot be removed, so that the problem that the whole scale remover is blocked at one or a plurality of positions is further prevented, and meanwhile, the problem that part of heat exchange tubes are bent due to the scale remover is avoided.

Secondly, the wheel cover plates, the pulley pressing plates and the water retaining cover plates at the two sides of the pulley and the sealing rings in the wheel cover plates can enable the pulley to be in a high-temperature and high-corrosion environment for a long time and not corroded, and the pulley can still slide normally and smoothly.

Drawings

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

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

Fig. 3 is a schematic view of the attachment of the seal pulley assembly to the hanger in accordance with 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 cross-sectional view of the scaler of the present invention.

FIG. 7 is a perspective view of the scaler of 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 numerals, such as repeated numbers and/or letters, may be used in various embodiments. These repetition are for the purpose of simplicity and clarity in describing the invention and do not in itself dictate a particular relationship between the various embodiments and/or configurations discussed.

Furthermore, spatially relative terms, such as "under" …, "underside," "inside-out," "above," "upper" and the like, may be used herein to facilitate a description of a relationship between one element or feature and another element or feature in the drawings, including different orientations of the device in use or operation, and the orientations depicted in the drawings. The spatially relative terms are intended to be construed as corresponding to a limitation of the present invention when the device is rotated 90 degrees or other orientations in which the spatially relative descriptors are used and the terms "first" and "second" are used for descriptive purposes only and not to be interpreted as indicating or implying a relative importance or an order of implying any particular order of magnitude. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

The invention is further described in the following description and detailed description with reference to the drawings: an online scale removing device for an evaporator as shown in fig. 1 to 7 comprises guide rails 100 symmetrically arranged at two sides of a heat exchange tube 202 in the interior of the evaporator 200, wherein the guide rails 100 are erected along the length of the evaporator 200, triangular ribs 101 are fixed on the upper surface of the guide rails 100 in the embodiment, sealing pulley assemblies 2 capable of moving along the guide rails 100 are respectively arranged on the guide rails 100, the triangular ribs 101 on the top of the guide rails 100 can be arranged on both guide rails or one of the guide rails, the sealing pulley assemblies 2 can be better guided to move along the guide rails 100, a bearing bracket 1 is suspended between the two sealing pulley assemblies 2, the bearing bracket 1 is positioned at the center of the evaporator 200 in the embodiment and is in a square frame shape, a plurality of cross bars 11 are arranged at the center of the bearing bracket 1 in a connecting way, the heat exchange tube 202 is arranged at the upper side and the lower side of the bearing bracket 1, the sealing pulley component 2 is respectively connected with the end part of the bearing bracket 1 through downwardly extending suspension brackets 10, each pulley is clamped in the middle by two suspension brackets 10, the two suspension brackets 10 respectively extend downwards from the left side and the right side of the guide rail 100 and are fixedly connected with the bearing bracket 1, a plurality of transmission brackets 3 which can longitudinally penetrate through the side surface of the heat exchange tube are arranged on a cross rod 11 of the bearing bracket 1, in the embodiment, the transmission brackets 3 are respectively arranged at the top and the bottom of the cross rod 11 of the bearing bracket 1 at intervals along the length direction of the bearing bracket 1, the transmission brackets 3 are made of rectangular sheet steel plates, a scaler 4 which is spiral and can axially move along the heat exchange tube is sleeved on the circumferential outer wall of the heat exchange tube 202, a plurality of inserting holes 31 which correspond to the scaler 4 are arranged on the transmission brackets 3, the inserting holes 31 are rectangular holes, one side of the scaler 4 facing the direction of the transmission bracket 3 is provided with a connecting rod 43, one end of the scaler is movably inserted into the inserting holes 31, the inserting holes 31 are vertically movable in the inserting holes 31, in the embodiment, the inserting holes 31 are symmetrically arranged corresponding to the heat exchange tubes 202 of each layer, one inserting hole 31 corresponds to the left heat exchange tube 202 and is used for being inserted with the scaler 4 sleeved on the left heat exchange tube 202, and the other inserting hole 31 corresponds to the right heat exchange tube 202 and is used for being inserted with the scaler 4 sleeved on the right heat exchange tube 202; a driving part 5 capable of pushing the driving bracket 3 and moving along the guide rail 100 by the two sealing pulley assemblies 2 is connected to one side of the driving bracket 3, so that the scale remover 4 scrapes dirt along the surface of the heat exchange tube 202.

As shown in fig. 1 to 5, the sealed pulley assembly 2 includes a pulley body 20 having a wheel shape, a concave groove 201 is provided around a running wheel surface of the pulley body 20, a bead 101 on the guide rail 100 is inserted into the groove 201, the pulley body 20 is restricted from being offset left and right and separated from the guide rail 100, and is unable to run along the guide rail 100, two concentric bearings 21 are symmetrically provided in an axial center of the pulley body 20, a bearing washer 22 capable of separating the bearings 21 is provided between the two bearings 21, the axial center of the two bearings 21 is penetrated through an axle 23, left and right ends of the axle 23 are respectively protruded outside the pulley body 20, a first rubber ring groove 231 surrounding an outer wall of the axle 23 is provided at a position where the axle 23 is protruded outside the pulley body 20, that is, a vertical plane of the outer wall of the pulley body 20 is just aligned with a center of the first rubber ring groove 231, a first sealing ring 232 is installed in the first rubber ring groove 231, an inner side of the first sealing ring 232 is accommodated in the axial center of the pulley body 20, an outer side of the first sealing ring 232 is exposed outside the pulley body 20, two axial centers of the bearing washer 21 are respectively provided with a water retaining plate 25 capable of penetrating end portions 23, and a water retaining plate 24 capable of penetrating through holes are provided at two ends of the axle ends of the pulley body 23; the pulley cover plate 24 is covered on the side wall of the pulley body 20 by a plurality of bolts penetrating through the peripheral outer wall and covers the axle center of the pulley body 20, the hole of the axle center of the pulley cover plate 24 is aligned with the axle center of the pulley body 20, and the end part of the wheel shaft 23 penetrates through the hole of the axle center 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, and 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 laminating mutually, namely: the first sealing ring 232 can seal the gap between the central hole of the pulley pressing sheet 25 and the wheel shaft 23, the inner wall of the circumference of the pulley cover plate 24 jogged with the pulley pressing sheet 25 is provided with a second concave rubber ring groove 241, and a second sealing rubber ring 242 which can be attached to the outer wall of the circumference of the pulley pressing sheet 25 in a surrounding manner is arranged in the second rubber ring groove 241, namely: the second sealing rubber ring 242 can seal the gap between the pulley pressing sheet 25 and the pulley cover plate 24, the first sealing ring 232 and the second sealing rubber ring 242 seal the wheel shaft and the bearing 21 inside, prevent water vapor and corrosive gas from entering the pulley body 20, erode the wheel shaft 23 inside and the bearing 21 inside and generate rust or rot, a boss 251 is formed on the outwards side of the pulley pressing sheet 25, which protrudes around the inner circular hole, a hole in the center of the water blocking cover plate 26 is sleeved on the boss 251, a 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 concavely arranged on the wall surface of the pulley cover plate 24 facing the outer side, the annular clamping groove 243 surrounds the outside of the pulley pressing sheet 25, waterproof rubber 251 is poured in the annular clamping groove 243, the clamping edge is clamped in the annular clamping groove 243, the pulley cover plate 24 is inserted into the waterproof glue, two annular deep grooves 120 are formed in the periphery of the axle center hole on the side face of the pulley cover plate 24 at intervals, waterproof glue rings or waterproof glue is arranged in the deep grooves 120, further corrosion of liquid entering the wheel shaft 23 at the axle center of the pulley body 20 and the bearing 21 is prevented, pulley back plates 27 which can be sleeved on the wheel shaft 23 are respectively arranged at the left end and the right end of the wheel shaft 23, fixing grooves 271 are formed in the left end and the right end of the wheel shaft 23 in a sleeving manner, the wheel shaft 23 is inserted into the fixing grooves 271 in a concave manner, a bottom plate fixing plate 28 is fixedly arranged at one end of the pulley back plate 27 located in the fixing grooves 271, a plurality of bolt holes 281 which can penetrate through bolts and are formed in the bottom plate fixing plate 28 along the circumference, and the pulley back plates 27 are mutually connected and fixed with the corresponding suspension frame 10 through bolts.

In addition, as shown in fig. 1, 2 and 6 and 7, the scale remover 4 includes a first scale removing portion 41 and a second scale removing portion 42 which are spirally sleeved on the outer wall of the circumference of the heat exchange tube 202 and are connected with each other, the connecting rod 43 is disposed at the connection position of the first scale removing portion 41 and the second scale removing portion 42, the spiral pitch of the first scale removing portion 41 is greater than that of the second scale removing portion 42, the first scale removing portion 41 and the second scale removing portion 42 are coil springs, the section of each spring wire is square, a gap 44 is formed between the inner diameter of each 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, and the inner diameter of the coil spring of the scale remover 4 needs to reach 21-21.5 MM, and it is important to say that: the pitch of the first descaling portion 41 is larger, the purpose is that after the scale is broken, the large scale can be firstly discharged and dropped from the larger pitch, and secondly, the second descaling portion 42 with smaller pitch can better crush the other scale which is not cleaned because of the dense spiral, and discharge the other scale from the pitch. The scale remover 4 is prevented from directly rubbing the tube wall of the heat exchange tube 202 to damage the tube wall, the coil spring can be matched with the connecting rod 43 to achieve more flexible position adjustment, the scale remover 4 is prevented from being blocked by the whole scale remover or being pulled to deform when encountering scales or welding spots which cannot be removed, for example, when one heat exchange tube is partially bent downwards, the scale remover 4 formed by the coil spring can automatically float up and down to adjust the position when moving to the place, the connecting rod 43 can not cause the condition that the coil spring cannot be dusted due to the rectangular inserting hole 31, the front end of the first scale removing part 41 and the tail end of the second scale removing part 42 are in a complete ring shape and are parallel to the connecting rod 43, the end part in the complete ring shape can more effectively enhance the rigidity of the scale remover 4, and the scale is placed between the screw pitches by the end part to cause the reduction of the cleaning effect.

Finally, as shown in fig. 2, in this embodiment, the driving unit 5 includes a hydraulic cylinder disposed outside the evaporator and a connection seat 51 connected to the support bracket 1, where an output end of the hydraulic cylinder is connected to the connection seat 51, specifically: the outer fixing seat 52 which can be fixedly connected with the front end of the cylinder barrel of the hydraulic cylinder is arranged on the outer wall of the evaporator, the inner fixing seat 53 which can be connected with the outer fixing seat 52 through penetrating bolts is arranged on the inner wall of the evaporator 200, the output end of the hydraulic cylinder, namely the head end of a piston rod of the hydraulic cylinder, penetrates through the outer fixing seat 52, the head end part of the piston rod of the hydraulic cylinder is provided with a connector 54, 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 through, the inner fixing seat 53 is matched to prevent gas in the evaporator from being exposed from the position where the piston rod of the hydraulic cylinder stretches in, the tightness of the evaporator body is ensured, the connector 54 is a hook-shaped piece with a downward opening, the connector 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, the connector 54 is hooked on the inner wall of the connector 51 at the position of the notch 511, and a protective sleeve 55 which can cover the connector 54 in the direction facing the connector 51 is also arranged on the wall surface of the inner fixing seat 53.

While there has been shown and described what is at present considered to be the fundamental principles and the main features of the invention and the advantages thereof, it will be understood by those skilled in the art that the present invention is not limited to the foregoing embodiments, but is described in the foregoing description merely illustrates the principles of the invention, and 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 (4)

1. The online descaling device for the evaporator is characterized by comprising guide rails (100) 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 bracket (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 bracket (1) through downwardly extending suspension brackets (10), a plurality of transmission brackets (3) capable of longitudinally penetrating the side surfaces of the heat exchange tube are arranged on the bearing bracket (1), a plurality of scale removers (4) which are spiral and capable of moving along the axial direction of the heat exchange tube are sleeved on the circumferential outer wall of the heat exchange tube, a plurality of plug holes (31) corresponding to the scale removers (4) are arranged on the transmission brackets (3), connecting rods (43) capable of being plugged in the plug holes (31) extend out of the scale removers (4), and one side of the transmission brackets (3) is connected with a driving part capable of pushing the transmission bracket (3) to move along the guide rails (100) and further remove the scale removers (5) along the surface of the heat exchange tube;

the connecting rod (43) is arranged on one side of the scaler (4) facing the direction of the transmission bracket (3) and one end of the connecting rod is movably inserted into the connecting hole (31), and the connecting rod (43) can move up and down in the connecting hole (31);

the sealing pulley assembly (2) comprises a pulley body (20) with a pulley shape, bearings (21) are symmetrically arranged in the axle center of the pulley body (20), bearing gaskets (22) capable of separating the bearings (21) are arranged between the two bearings (21), an axle (23) is penetrated through the axle center of the two bearings (21), the left end and the right end of the axle (23) are respectively protruded 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 where the axle (23) is protruded 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 axle center of the pulley body (20), the outer sides of the first sealing rings (232) are exposed out of the pulley body (20), and a pulley (24), a pulley pressing sheet (25) and a water retaining plate (26) which are sleeved at the end parts of the axle (23) and penetrate through required holes are respectively arranged at the axle center positions in sequence; the pulley cover plate (24) is covered on the pulley body (20) by penetrating bolts along the circumferential outer wall and covers the axle center of the pulley body (20); the pulley pressing piece (25) is embedded in a central axle center hole of the pulley cover plate (24), the circumferential inner wall of the inner circle of the pulley pressing piece (25) is attached to the circumferential outer wall of one side of the first sealing ring (232), the circumferential inner wall of the pulley pressing piece (24) which is embedded with the pulley pressing piece (25) is provided with a concave second rubber ring groove (241), a second sealing rubber ring (242) which can be attached to the circumferential outer wall of the pulley pressing piece (25) in a surrounding way is arranged in the second rubber ring groove (241), a boss (251) is formed on one side of the pulley pressing piece (25) which protrudes outwards and surrounds the inner circle hole, the hole in the center of the water blocking cover plate (26) is sleeved on the boss (251), the circumferential outer edge of the water blocking cover plate (26) is provided with a clamping edge (261) which extends towards the direction of the pulley pressing piece (24), an annular clamping groove (243) is concavely arranged on the wall surface of the outer side of the pulley pressing piece (24), the annular clamping groove (243) is arranged around the pulley pressing piece (25), the clamping edge (261) is clamped on the outer side of the pulley pressing piece (25), the annular clamping groove (243) is fixedly sleeved on the wheel shaft (23) on the inner side of the back plate (23), the left side of the back plate (23) is provided with a fixed wheel shaft groove (23), a bottom plate fixing piece (28) is fixedly arranged at one end of the pulley backboard (27) positioned in the fixing groove (271), a plurality of bolt holes (281) which can penetrate through bolts and are connected with the end part of the wheel axle (23) are formed in the circumference of the bottom plate fixing piece (28), and the pulley backboard (27) and the suspension bracket (10) are mutually connected and fixed through the bolts;

the scale remover (4) comprises a first scale removing part (41) and a second scale removing part (42) which are spirally sleeved on the circumferential outer wall of the heat exchange tube and are connected with each other, a connecting rod (43) is arranged at the joint of the first scale removing part (41) and the second scale removing part (42), and the spiral pitch of the first scale removing part (41) is larger than that of the second scale removing part (42);

the first descaling part (41) and the second descaling part (42) are spiral springs, and the section of a spring wire is square;

a gap (44) is formed between the inner diameter of the spiral spring and the outer circumferential wall surface of the heat exchange tube;

the travelling wheel surface surrounding the pulley body (20) is provided with a concave groove (201), a convex rib (101) is fixed on the upper surface of the guide rail (100), and the convex rib (101) is inserted into the groove (201).

2. An on-line evaporator descaling device according to claim 1, wherein the driving member (5) comprises a hydraulic cylinder arranged outside the evaporator and a connecting seat (51) connected to the support bracket (1), and the output end of the hydraulic cylinder is connected with the connecting seat (51).

3. The online descaling device for evaporators according to claim 2, wherein an outer fixing seat (52) 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 fixing seat (53) capable of being connected with the outer fixing seat (52) through a penetrating bolt is arranged on the inner wall of the evaporator, a connector (54) is arranged at the head end of a piston rod of the hydraulic cylinder, and the connector (54) is connected with the connector (51).

4. An online evaporator descaling device according to claim 3, wherein the connecting seat (51) is a hollow column vertically arranged, a notch (511) is formed in a side wall surface facing the direction of the inner fixing seat (53), the connecting head (54) is a hook-shaped piece 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).