Roller dryer and on-line repairing device and on-line repairing method thereof

Abstract

The invention provides a roller dryer and an online repairing device and method thereof. The device comprises a moving device; the grinding device and the control device are mounted on the moving device; the moving device is arranged beside the roller; the polishing device comprises a rack, a polishing driving motor and a polishing mechanism, wherein the polishing driving motor and the polishing mechanism are installed on the rack. The rack is rotationally connected with the moving device; the polishing mechanism comprises a belt wheel and an abrasive belt; the control device comprises first and second cylinders; the second air cylinder is rotationally connected with the moving device and the rack; the first cylinder can be used for a belt wheel; the method comprises the steps that the first air cylinder and the second air cylinder are jointly matched to adjust the pressing force applied when the abrasive belt makes contact with the outer surface of the roller; the grinding driving motor drives the grinding mechanism to move, so that the abrasive belt grinds the roller; when the roller is polished, the roller rotates in the preset direction, and the moving device horizontally moves in the axial direction of the roller; therefore, online mirror surface repairing of the roller is achieved, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of zero-discharge treatment of wastewater, and in particular relates to a drum dryer for crystallization and collection of impure salt equipment, and an online repair device and an online repair method thereof. Background Art

[0002] Coking wastewater is one of the main wastewaters discharged by industries such as steel and coal. It contains a variety of pollutants such as ammonia, cyanide, thiocyanate, phenol, naphthalene, pyridine, quinoline, anthracene and other heterocyclic and polycyclic aromatic hydrocarbons (PAHs), which pose a serious threat to the environment and human health. Therefore, zero discharge of coking wastewater has important environmental significance. However, it is very difficult to treat zero discharge of coking wastewater. Currently, the zero-discharge process of "pretreatment + deep membrane treatment + crystallization disposal" is mainly used to treat this type of wastewater. During the treatment process, monovalent sodium chloride and divalent sodium sulfate are separated by salt separation nanofiltration membranes, and concentrated into high-concentration brine through multi-stage reverse osmosis membranes. The high-concentration brine is further converted into sodium chloride and sodium sulfate product salts by evaporation crystallization or freezing crystallization. Therefore, the concentrated brine produced during the treatment of coking wastewater has a high salt content and complex composition. During the crystallization process of salt production, the centrifuge will produce sodium chloride mother liquor and sodium sulfate mother liquor. The mother liquor contains a variety of organic pollutants, such as sodium ions, potassium ions, nitrate ions and other substances. The shock load of pollutant concentration is too high, which makes it impossible for the mother liquor to flow back to the front-end process for re-disposal.

[0003] At present, the conventional methods of mother liquor impurity salt disposal mainly include single-effect or multi-effect evaporation, drum drying disposal, vacuum rake drying, etc. The above-mentioned disposal methods will also encounter various problems during the actual operation process. For example, single-effect or multi-effect evaporation is strongly affected by the water quality of the mother liquor, has weak impact load resistance, and requires large manpower investment. At the same time, the steam cost of the single-effect or multi-effect evaporation process is high; drum drying disposal has a great impact on the material of the drum and scraper, and the residual high-concentration material will further corrode the device and affect the operating life of the device; in the vacuum rake drying disposal method, organic pollutants in the concentrated brine will increase the viscosity of the material, causing it to adhere to the inner wall of the machine, the rotating shaft and other positions, the operation fluctuation is too large, the system is unstable, and the control is difficult; in comparison, the drum drying operation state is relatively stable, and the actual application on site is more extensive. The drum dryer (also known as the mother liquor evaporation integrated machine) is an internal heating conduction type rotary drying equipment. The wet material obtains heat transferred by heat transfer on the outer wall of the drum, removes moisture, and reaches the required wet water content. The heat is conducted from the inner wall of the drum to the outer wall of the drum, and then passes through the material film. It has high thermal efficiency and can operate continuously, so it is widely used in the drying of liquid materials, and is more suitable for paste and viscous materials.

[0004] Most of the drum dryers in the prior art are of integrated design. If such equipment is to achieve a better treatment effect during operation, the drum surface must be kept smooth to ensure uniform steam heat transfer. In the early stage of use, due to the smooth surface of the drum and uniform heat transfer, a salt particle layer is generated on the surface, and the salt particles are scraped off the drum surface by a scraper. However, since the mother liquor is very corrosive and the pressure and temperature of the heating steam inevitably fluctuate, corrosion points will appear on the surface of the drum after a period of operation and gradually expand, and the salt layer will be unevenly generated, forming salt scale. Not only will the scraper be damaged, but it will also affect the generation of salt particles and the operation of zero-discharge wastewater. At present, there is no better way to deal with this problem. The only way is to shut down the machine, open the cover of the equipment, dismantle a series of equipment such as various pipelines, transmission devices, discharging devices, scraper devices, upper smoke hoods, etc., lift the drum out of the workstation with a crane, and then transport the drum to the manufacturer for surface polishing. After polishing to the mirror level, it will be transported back to the site and reinstalled for use. In this way, the rectification cycle will take at least two weeks, which will seriously affect wastewater treatment, reduce production efficiency, and increase production costs. Summary of the invention

[0005] The purpose of the present invention is to provide a drum dryer and its online repair device and online repair method to solve the problems in the prior art that the machine needs to be shut down, various equipment needs to be dismantled, the drum needs to be transported to a manufacturer for grinding, and then transported back to the site for reinstallation and use.

[0006] To achieve the above object, the present invention provides an online repair device for a drum dryer, the drum dryer comprising a drum, the online repair device comprising: a moving device; and a polishing device and a control device mounted on the moving device; the moving device is arranged beside the drum and can move horizontally along the axial direction of the drum;

[0007] The grinding device comprises a frame, a grinding drive motor and a grinding mechanism installed on and connected to the frame; the frame is rotatably connected to the moving device so that the grinding device can move left and right in a transverse plane corresponding to the drum; the grinding mechanism comprises a pulley and an abrasive belt, the abrasive belt is sleeved on at least two of the pulleys, and the pulley is used to drive the abrasive belt to move under the drive of the grinding drive motor to grind the drum;

[0008] The control device includes a first cylinder and a second cylinder; the second cylinder is rotatably connected to the moving device and the frame respectively; the first cylinder can act on the pulley; the first cylinder and the second cylinder cooperate to adjust the pressing force applied when the sanding belt contacts the outer surface of the drum.

[0009] As an optional embodiment, one of the pulleys is a contact wheel, the first cylinder contacts the surface of the contact wheel on a side facing away from the roller through a piston output mechanism, and the force direction of the piston output mechanism intersects with the central axis of the contact wheel.

[0010] As an optional implementation, the online repair device further satisfies at least one of the following conditions:

[0011] There is surface contact between the piston output mechanism and the contact wheel;

[0012] The force direction of the piston output mechanism intersects with but is not perpendicular to the central axis of the contact wheel;

[0013] The force direction of the piston output mechanism intersects with the central axis of the contact wheel at an angle of 15° to 30°.

[0014] As an optional embodiment, the grinding device also includes a grinding reducer, the grinding drive motor, the grinding reducer and the grinding mechanism are connected in sequence; and / or the moving device includes a guide rail and a moving trolley installed on the guide rail, the guide rail is arranged next to the roller and parallel to the roller, and the top of the moving trolley is rotatably connected to the frame and the second cylinder.

[0015] As an optional embodiment, a first limit device and a second limit device are respectively provided at both ends of the guide rail; the first limit device is used to limit the travel of the moving device toward the front end of the roller, and the second limit device is used to limit the travel of the moving device toward the rear end of the roller.

[0016] As an optional implementation, the sanding belts have three specifications, the mesh sizes of the three sanding belts are different from each other, and the three sanding belts are used in sequence from small to large mesh sizes to grind the roller in sequence.

[0017] Furthermore, to achieve the above-mentioned object, the present invention also provides an online repair method for a drum dryer, the online repair method is performed based on any one of the online repair devices for a drum dryer, and comprises:

[0018] By means of the first cylinder and the second cylinder, the pressing force applied when the abrasive belt contacts the outer surface of the drum is adjusted;

[0019] The grinding mechanism is driven to move by the grinding drive motor, so that the grinding mechanism grinds the drum through the sand belt;

[0020] While grinding the roller, the roller is driven to rotate in a preset direction, and the moving device is driven to move horizontally along the axial direction of the roller.

[0021] As an optional embodiment, the sanding belt has three specifications, the mesh sizes of the three sanding belts are different from each other, and the online repair method further includes:

[0022] Firstly, the drum is polished using a first type of abrasive belt;

[0023] Then, the drum is sanded using a second sanding belt;

[0024] Finally, the drum is polished using a third type of abrasive belt;

[0025] Among them, the mesh sizes of the first sanding belt, the second sanding belt and the third sanding belt increase successively.

[0026] As an optional implementation, the online repair method further includes performing the following steps at least once:

[0027] The grinding device starts grinding from the position corresponding to the first limiting device, and moves along the axial direction of the drum driven by the moving device until the moving device touches the second limiting device. The grinding device is then driven by the moving device to run in the reverse direction until the moving device touches the first limiting device.

[0028] Furthermore, to achieve the above-mentioned purpose, the present invention also provides a drum dryer, which is provided with an online repair device of the drum dryer as described in any one of the above; the drum of the drum dryer is integrated with the online repair device, or the drum and the online repair device are independently arranged.

[0029] Compared with the prior art, the drum dryer and the online repair device and online repair method of the present invention have the following advantages:

[0030] In the aforementioned drum dryer and its online repair device and online repair method, when the drum in the drum dryer has problems such as corrosion and salt scale on the surface after being used for a period of time, which affects the wastewater treatment, the grinding drive motor can be used to drive the grinding mechanism to grind the drum. During the grinding process, the moving device can drive the grinding mechanism to move horizontally along the axial direction of the drum to increase the grinding coverage and uniformity in the axial direction. Combined with the rotation of the drum, the grinding coverage and uniformity in the circumferential direction are increased, and finally the drum of the drum dryer can be fully, fully and evenly polished with high grinding accuracy and good grinding effect, which can basically restore the drum to the mirror effect before leaving the factory. In this way, there is no need to dismantle the equipment for external transportation, which effectively reduces the repair cycle and maintenance costs. At the same time, it does not affect the wastewater treatment, improves the equipment commissioning rate, and reduces production costs.

[0031] On the other hand, by cooperating with the first cylinder and the second cylinder to adjust the pressing force applied when the sanding belt contacts the outer surface of the drum, the pressing force during grinding can be better controlled while taking the supporting force into consideration, thereby achieving a better grinding effect and better grinding efficiency without causing excessive damage to the drum, affecting the service life of the drum, and not damaging the second cylinder.

[0032] In further improvements, by improving the sanding belt and process, the needs of mirror repair can be better met. Specifically, the first sanding belt (large particles) is used to grind the drum, then the second sanding belt (medium particles) is used to grind the drum, and finally the third sanding belt (small particles) is used to grind the drum. The grinding effect is good and the grinding accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to better understand the present invention and shall not constitute improper limitations of the present invention.

[0034] Figure 1 It is a front view schematic diagram of a drum dryer and an online repair device thereof provided according to one embodiment of the present invention.

[0035] Figure 2 yes Figure 1 A partially enlarged schematic diagram of the grinding unit, the first cylinder and the second cylinder.

[0036] Figure 3 yes Figure 1 A partially enlarged schematic diagram of the mobile unit.

[0037] Figure 4 It is a top view schematic diagram of a drum dryer and an online repair device thereof provided according to one embodiment of the present invention.

[0038] Figure 5 yes Figure 4A partially enlarged schematic diagram of the online repair device.

[0039] [Description of reference numerals is as follows]: 100 - roller, 200 - online repair device, 210 - moving device, 211 - guide rail, 212 - moving drive motor, 213 - walking wheel, 214 - frame, 220 - grinding device, 221 - frame, 222 - grinding drive motor, 223 - grinding mechanism, 224 - pulley, 225 - sanding belt, 226 - grinding reducer, 227 - contact wheel, 230 - control device, 231 - first cylinder, 232 - second cylinder, 300 - smoke hood, 310 - chimney. DETAILED DESCRIPTION

[0040] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the present embodiment only illustrate the basic concept of the present invention in a schematic manner, and only the components related to the present invention are shown in the figure instead of being drawn according to the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be a random change, and the component layout type may also be more complicated.

[0041] In addition, each embodiment of the following description has one or more technical features, but this does not mean that the user of the present invention must implement all the technical features in any embodiment at the same time, or can only implement part or all of the technical features in different embodiments separately. In other words, under the premise that implementation is possible, those skilled in the art can selectively implement part or all of the technical features in any embodiment according to the disclosure of the present invention and according to the design specifications or implementation requirements, or selectively implement a combination of part or all of the technical features in multiple embodiments, thereby increasing the flexibility of the implementation of the present invention.

[0042] As used in this specification, the singular forms "one", "an" and "the" include plural objects, and the plural form "multiple" includes more than two objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise, and the terms "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. Relational terms such as the terms "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor do they indicate or imply relative importance or implicitly indicate the number of technical features indicated. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In order to make the purpose, advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0044] Figure 1 is a front view of a drum dryer and an online repair device thereof provided by an embodiment of the present invention, Figure 4 1 is a top view of a drum dryer and an online repair device thereof provided by an embodiment of the present invention. Figure 1 and Figure 4 As shown, the drum dryer includes a drum 100; the drum dryer usually also includes a smoke hood 300. Generally, the smoke hood 300 is arranged on the upper part of the drum 100. It can also be seen that the smoke hood 300 is provided with a chimney 310, and the chimney 310 can discharge the exhaust gas generated in the wastewater treatment process; the outer periphery of the lower part of the drum 100 is usually also provided with a cover plate (not shown) to achieve the purpose of protection.

[0045] It is understandable that after the drum dryer has been running for a period of time, the outer surface of the drum 100 will have problems such as rust and salt scaling. If not treated, it will seriously affect production and affect the treatment of coking wastewater. Therefore, the drum dryer provided in the embodiment of the present invention also includes an online repair device 200, which is intended to perform online mirror repair on the drum 100 through the online repair device 200, so that the outer surface of the drum 100 becomes smooth and achieves a mirror effect. The online repair device 200 is integrated with the drum 100. In other cases, the drum 100 and the online repair device 200 are independently set.

[0046] Key References Figure 1 , and combined with Figure 2 and Figure 3 The online repair device 200 includes: a mobile device 210; and a grinding device 220 and a control device 230 installed on the mobile device 210. The control device 230 can be directly or indirectly installed on the mobile device 210, and similarly, the grinding device 220 can be directly or indirectly installed on the mobile device 210.

[0047] See also Figure 4 and Figure 5 The main function of the moving device 210 is to drive the grinding device 220 to move horizontally in the axial direction of the drum 100, increase the grinding coverage and uniformity in the axial direction, and adapt to the grinding process of the drum 100. In some embodiments, during the grinding process, the moving device 210 only moves in one direction, such as from the front end to the rear end of the drum 100, or from the rear end to the front end of the drum 100. In the embodiment provided by the present invention, during the grinding process, the moving device 210 can move back and forth, such as Figure 4 and Figure 5 As indicated by the arrow W, the moving device 210 can be moved to positions S1, S2 and S3 in sequence to perform comprehensive grinding on the drum 100. Specifically, the moving device 210 is arranged beside the drum 100, specifically beside the outer periphery of the drum 100, and enables the moving device 210 to move horizontally along the axial direction of the drum 100. The axial direction of the drum 100 is the length direction of the drum 100.

[0048] However, the present invention does not impose any specific restrictions on the specific structure of the moving device 210. For example, the moving device 210 may be moved by sliding a slider on a linear guide rail, rolling a wheel on a linear guide rail, or may be a synchronous belt drive, a ball screw, a gear rack, a hydraulic pressure / cylinder, a linear motor, etc. Therefore, there are many ways for the moving device 210 to move, and at least one of them may be selected to perform. The following is an exemplary description.

[0049] like Figure 1 and Figure 3 As shown, as an optional embodiment, the mobile device 210 includes a guide rail 211 and a mobile trolley installed on the guide rail 211; the mobile trolley includes a mobile drive motor 212, a walking wheel 213 and a frame 214; the guide rail 211 is arranged beside the drum 100 and is arranged parallel to the drum 100; the guide rail 211 is fixed on the foundation, which is a natural foundation or an artificial foundation; the mobile drive motor 212 and the walking wheel 213 are both installed at the bottom of the frame 214; the mobile drive motor 212 is connected to the left and right walking wheels 213 in a transmission manner to drive the left and right walking wheels 213 to roll on the guide rail 211, so as to drive the entire mobile trolley to move along the guide rail 211, and therefore, the grinding device 220 is driven by the mobile trolley to grind the drum 100 at different horizontal positions in the axial direction of the drum 100. In addition, the moving speed of the mobile device 210 can be set according to the speed of grinding and repairing, which is not limited by the present invention. In addition, the mobile device 210 can be equipped with a reducer to better control the moving speed of the mobile vehicle.

[0050] Next, refer to Figure 1 and Figure 2 As shown, the grinding device 220 includes a frame 221, a grinding drive motor 222 mounted on and connected to the frame 221, and a grinding mechanism 223; the frame 221 is rotatably connected to the moving device 210, so that the grinding device 220 can move left and right in a transverse plane corresponding to the drum 100 with the support A as a fulcrum (see Figure 1 As indicated by the arrow R), in this embodiment, the bottom of the frame 221 is rotatably connected to the top of the moving trolley; the grinding mechanism 223 includes a pulley 224 and a sanding belt 225, and the sanding belt 225 is sleeved on at least two pulleys 224. The pulley 224 is used to drive the sanding belt 225 to move under the drive of the grinding drive motor 222 to grind the drum 100.

[0051] The present invention adopts a flexible abrasive tool such as an abrasive belt 225, which is more flexible and safer than a grinding wheel during grinding, and has higher grinding accuracy and good cost performance for grinding. Moreover, the abrasive belt 225 is in flexible contact with the surface of the drum 100, which reduces overheating or damage to the surface of the drum 100, and can also be adapted to the grinding of three-dimensional curved surfaces such as the drum 100. The movement direction and speed of the abrasive belt 225 can be controlled by the grinding drive motor 222 to meet the needs of mirror repair. In addition, by moving the grinding device 220 left and right in the transverse plane corresponding to the drum 100, the pressing force applied by the grinding mechanism 223 to the drum 100 can be adjusted, and the supporting force received by the grinding mechanism 223 can also be adjusted.

[0052] Optionally, the polishing device 220 further includes a polishing reducer 226; the polishing drive motor 222, the polishing reducer 226 and the polishing mechanism 223 are connected in sequence. Through the reduction transmission, the polishing mechanism 223 can operate more stably to ensure the quality of the repair of the drum 100. It should be noted that the polishing reducer 226 can adopt various common reduction devices, and the present invention is not limited to this.

[0053] The surface of the pulley 224 can be wrapped with rubber or similar materials to increase friction and prevent the sanding belt 225 from slipping. When setting the pulley 224, it is also necessary to maintain the tension of the sanding belt 225 and keep the sanding belt 225 tight. In practice, during sanding with the sanding belt, there is a pulley 224 as a contact wheel 227, which supports the contact area between the sanding belt 225 and the drum 100 and transmits the sanding pressure. The contact wheel 227 can be a rigid wheel (metal) or an elastic wheel (such as rubber), which can control the pressure distribution of the sanding belt 225 on the drum 100. In some cases, a guide mechanism can be set to prevent the sanding belt 225 from running off or displacing laterally. For example, the rim of the pulley 224 is slightly higher than the edge of the sanding belt 225 to limit lateral displacement. It can also be that the sanding belt 225 is corrected by fine-tuning the angle of the guide roller.

[0054] Further research has found that the difficulty of mirror repairing the roller 100 lies in the control of the pressing force and the supporting force. If the pressing force and the supporting force cannot be taken into account, the sanding belt 225 and the surface of the roller 100 may not fit well, which affects the grinding accuracy and easily damages the roller 100, and even crushes the second cylinder 232. Therefore, the pressing force and the supporting force should be appropriate.

[0055] To this end, it is necessary to further improve the pressing force and the supporting force through the control device 230. The control device 230 specifically includes a first cylinder 231 and a second cylinder 232, see Figures 1 to 3 . The second cylinder 232 is rotatably connected to the mobile device 210 and the frame 221, respectively. For example, in this embodiment, the second cylinder 232 is rotatably connected to the top of the mobile trolley. In addition, the first cylinder 231 is configured to act on the pulley 224, specifically, directly act on the contact wheel 227, or in other words, the piston output mechanism of the first cylinder 231 can support the contact wheel 227, so that the tension of the sand belt 225 and the pressing force of the sand belt 225 can be controlled. The second cylinder 232 provides an upward supporting force, which indirectly affects the pressing force of the sand belt 225.

[0056] Therefore, the first cylinder 231 and the second cylinder 232 need to cooperate with each other to adjust the pressing force applied when the sanding belt 225 contacts the outer surface of the drum 100, rather than unilaterally adjusting the first cylinder 231 or the second cylinder 232. Specifically, if the pressing force is too large, the second cylinder 232 and the drum 100 will be damaged; if the supporting force of the second cylinder 232 is too large, it is easy to cause the grinding mechanism 223 to bend up and not fit tightly with the outer surface of the drum 100, affecting the grinding effect.

[0057] Therefore, in order to achieve high-precision grinding, it is necessary to control the pressing force applied by the sanding belt 225 to the drum 100. It can be understood that the role of the first cylinder 231 is to increase the pressure during grinding, and the role of the second cylinder 232 is to provide support. The two can play a complementary role and can adapt to the grinding of different particles attached to the surface of the drum 100. In short, the grinding needs to meet the technical requirements of mirror polishing. The effect of surface grinding can be detected by instruments, or by visual inspection by personnel to ensure that the drum 100 meets the surface requirements at the time of leaving the factory after repair. Finally, ensure that the pressing force and the supporting force are at appropriate values ​​to achieve the effects described above.

[0058] Accordingly, an embodiment of the present invention further provides an online repair method for a drum dryer, which is performed based on the online repair device 200 described in any embodiment and includes:

[0059] Step S01: adjusting the pressing force applied by the abrasive belt 225 when in contact with the outer surface of the drum 100 through the first cylinder 231 and the second cylinder 232;

[0060] Step S02: The grinding mechanism 223 is driven to move by the grinding drive motor 222, so that the grinding mechanism 223 grinds the drum 100 through its sanding belt 225;

[0061] Step S03 : while polishing the roller 100 , the roller 100 is driven to rotate in a preset direction (eg, clockwise L or counterclockwise), and the moving device 210 is also driven to move horizontally along the axial direction of the roller 100 .

[0062] Based on this, when the mirror surface of the drum 100 needs to be repaired, the drum 100 can be polished by the polishing mechanism 223, and the polishing mechanism 223 can also be driven by the moving device 210 to move horizontally along the axial direction of the drum 100, and based on the rotation of the drum 100, the drum 100 of the drum dryer can finally be fully, fully and evenly polished, with high polishing accuracy and good polishing effect, which can basically restore the drum 100 to the mirror surface effect before leaving the factory. More importantly, through the cooperation of the first cylinder 231 and the second cylinder 232, the pressing force applied by the sand belt 225 when contacting the outer surface of the drum 100 can be adjusted, and the pressing force can be better controlled, while taking into account the supporting force of the second cylinder 232.

[0063] In this embodiment, the first cylinder 231 contacts the surface of the side of the contact wheel 227 away from the drum 100 through the piston output mechanism, and the force direction of the piston output mechanism intersects with the central axis of the contact wheel 227. Considering that when the force direction of the piston output mechanism intersects with the central axis of the contact wheel 227 perpendicularly, the torque will be very large, and a larger motor needs to be configured, which increases the cost and also affects the life of the motor. For this reason, preferably, the force direction of the piston output mechanism does not intersect with the central axis of the contact wheel 227 perpendicularly. More preferably, the angle between the force direction of the piston output mechanism and the central axis of the contact wheel 227 is 15° to 30°, that is, the two intersect at an angle of 15° to 30°, thereby reducing the torque, reducing the motor specifications, and improving the service life of the motor. The piston output mechanism and the contact wheel 227 are preferably in surface contact, which can ensure that the sand belt 225 is evenly stressed, avoid local overload and wear, and thus extend the service life of the sand belt 225.

[0064] The piston output mechanism at least includes a piston and a piston rod, and the movement of the piston is converted into the pressure applied by the piston rod to the contact wheel 227 to achieve the adjustment of the pressing force.

[0065] In addition, another key point in mirror repairing the drum 100 is the mesh number of the sanding belt 225. The pressing force required for sanding belts 225 of different mesh numbers can be the same or different. Further research found that the sanding belt 225 has three optimal specifications, the mesh numbers of the three sanding belts 225 are different from each other, and the three sanding belts are used in order from small to large mesh numbers to grind the drum 100 in sequence, ensuring that the surface of the repaired drum 100 meets the mirror requirements.

[0066] More specifically, in one embodiment, the online repair method further includes:

[0067] First, the drum 100 is firstly polished using the first type of abrasive belt 225;

[0068] Then, the drum 100 is subjected to secondary grinding using the second type of abrasive belt 225;

[0069] Finally, the drum 100 is finally polished using the third type of abrasive belt 225 to achieve a mirror finish;

[0070] The mesh numbers of the first sanding belt 225, the second sanding belt 225 and the third sanding belt 225 increase in sequence, which results in better grinding effect and higher grinding accuracy.

[0071] Preferably, the online repair device 200 further includes a first limiting device and a second limiting device; the first limiting device limits the travel of the mobile device 210 toward the front end of the drum 100, and when the mobile device 210 touches the first limiting device, it returns and moves toward the rear end of the drum 100; the second limiting device also limits the travel of the mobile device 210 toward the rear end of the drum 100, and when the mobile device 210 touches the second limiting device, it returns and moves toward the front end of the drum 100. The positions of the first limiting device and the second limiting device can be set according to the length of the drum 100 to be polished and the width of the pulley 224. The first limiting device and the second limiting device are preferably conventional contact limiting devices, which are simple in structure and easy to use. Specifically in this embodiment, the first limiting device and the second limiting device are respectively provided at both ends of the guide rail 211. In addition, the grinding starting position can be set at one end of the drum 100 or at other positions of the drum 100, and there is no special requirement for this.

[0072] Furthermore, in one embodiment, the online repair method further includes performing the following steps at least once:

[0073] The grinding device 220 starts grinding from the position corresponding to the first limiting device, and moves along the axial direction of the drum 100 driven by the moving device 210 until the moving device 210 touches the second limiting device. The grinding device 220 is driven by the moving device 210 to run in the reverse direction until the moving device 210 touches the first limiting device.

[0074] That is to say, grinding can be started from the position corresponding to the first limit device and run along the axial direction of the drum 100. When the second limit device is touched, the grinding device 220 runs in the reverse direction until it touches the first limit device. This process can be performed once or multiple times in sequence as long as the surface of the drum 100 meets the mirror requirements.

[0075] In order to better understand the present invention, the drum dryer and its online repair device 200 and the online repair process are further described below in conjunction with specific embodiments.

[0076] In a non-limiting use case, the online repair process includes the following steps:

[0077] Step 1: Open the cover plate on the side of the drum 100;

[0078] Step 2: The mobile trolley moves along the guide rail 211 to the edge of the front end or rear end of the drum 100;

[0079] Step 3: The grinding device 220 is adjusted up and down to a suitable position;

[0080] Step 4: Turn on the power supply, drive the roller 100 to rotate in the clockwise direction, and the grinding mechanism 223 generates a pressing force under the drive of the first cylinder 231, and grinds along the horizontal position of the roller 100 under the drive of the grinding drive motor 222, and moves at a fixed speed, and grinds in a cycle. In addition, three sanding belts 225 with different mesh sizes can be replaced in sequence according to the grinding situation, and the grinding is stopped until the grinding meets the corresponding requirements.

[0081] From the above, it can be seen that the drum dryer provided by the present invention can be equipped with an online repair device. Once the surface of the drum 100 has problems such as corrosion and salt scale on the surface, the drum 100 can be polished online through the online repair device. During the polishing process, the polishing mechanism 223 can be driven by the moving device 210 to move horizontally along the axial direction of the drum 100, thereby increasing the polishing coverage and uniformity in the axial direction. At the same time, combined with the rotation of the drum 100, the polishing coverage and uniformity in the circumferential direction are increased, so that the drum 100 can be fully, fully and evenly polished in the end, with high polishing accuracy and good polishing effect, which can basically restore the drum 100 to the mirror effect before leaving the factory. In this way, there is no need to dismantle the equipment for external transportation, which effectively reduces the repair cycle and maintenance costs. At the same time, it does not affect wastewater treatment, improves the equipment commissioning rate, and reduces production costs. Moreover, when the online repair device provided by the present invention performs online mirror repair on the drum 100, it can better take into account the grinding accuracy, grinding efficiency and damage to the drum 100, and the entire online repair device 200 has a simple structure and is easy to operate and use. Ultimately, it can greatly reduce the repair cycle of the drum 100, reduce the repair cost, and does not affect wastewater treatment, thereby improving production efficiency.

[0082] On the other hand, the present invention adjusts the pressing force applied by the sanding belt 225 when it contacts the outer surface of the drum 100 through the cooperation of the first cylinder 231 and the second cylinder 232, so as to better control the pressing force during grinding and take the supporting force into consideration, thereby achieving a better grinding effect and a better grinding efficiency without causing excessive damage to the drum 100, affecting the service life of the drum 100, and damaging the second cylinder 232.

[0083] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the present invention specification and its equivalent technology, the present invention is also intended to include these modifications and variations.

Claims

1. An online repair device for a drum dryer, the drum dryer comprising a drum, characterized in that: The online repair device comprises: a moving device; and a grinding device and a control device installed on the moving device; the moving device is arranged beside the drum and can move horizontally along the axial direction of the drum; The grinding device comprises a frame, a grinding drive motor and a grinding mechanism installed on and connected to the frame; the frame is rotatably connected to the moving device so that the grinding device can move left and right in a transverse plane corresponding to the drum; the grinding mechanism comprises a pulley and an abrasive belt, the abrasive belt is sleeved on at least two of the pulleys, and the pulley is used to drive the abrasive belt to move under the drive of the grinding drive motor to grind the drum; The control device includes a first cylinder and a second cylinder; the second cylinder is rotatably connected to the moving device and the frame respectively; the first cylinder can act on the pulley; the first cylinder and the second cylinder cooperate to adjust the pressing force applied when the sanding belt contacts the outer surface of the drum.

2. The online repair device for a drum dryer according to claim 1, characterized in that: One of the pulleys is a contact wheel, and the first cylinder contacts a surface of the contact wheel on a side facing away from the roller through a piston output mechanism, and a force direction of the piston output mechanism intersects with a central axis of the contact wheel.

3. The online repair device for a drum dryer according to claim 2, characterized in that: Also meets at least one of the following conditions: There is surface contact between the piston output mechanism and the contact wheel; The force direction of the piston output mechanism intersects with but is not perpendicular to the central axis of the contact wheel; The force direction of the piston output mechanism intersects with the central axis of the contact wheel at an angle of 15° to 30°.

4. The online repair device for a drum dryer according to claim 1, characterized in that: The grinding device also includes a grinding reducer, and the grinding drive motor, the grinding reducer and the grinding mechanism are connected in sequence; and / or the moving device includes a guide rail and a moving trolley installed on the guide rail, the guide rail is arranged next to the roller and parallel to the roller, and the top of the moving trolley is rotatably connected to the frame and the second cylinder.

5. The online repair device for a drum dryer according to claim 4, characterized in that: A first limiting device and a second limiting device are respectively provided at both ends of the guide rail; the first limiting device is used to limit the travel of the moving device toward the front end of the drum, and the second limiting device is used to limit the travel of the moving device toward the rear end of the drum.

6. The online repair device for a drum dryer according to claim 1, characterized in that: The sanding belts have three specifications, the mesh sizes of the three sanding belts are different from each other, and the three sanding belts are used in sequence from small to large mesh sizes to grind the roller in sequence.

7. An online repair method for a drum dryer, characterized in that: The online repair method is performed based on the online repair device of the drum dryer according to claim 1, and comprises: By means of the first cylinder and the second cylinder, the pressing force applied when the abrasive belt contacts the outer surface of the drum is adjusted; The grinding mechanism is driven to move by the grinding drive motor, so that the grinding mechanism grinds the drum through the sand belt; While grinding the roller, the roller is driven to rotate in a preset direction, and the moving device is driven to move horizontally along the axial direction of the roller.

8. The online repair method of a drum dryer according to claim 7, characterized in that: The sanding belts have three specifications, the mesh sizes of the three sanding belts are different from each other, and the online repair method further includes: Firstly, the drum is polished using a first type of abrasive belt; Then, the drum is sanded using a second sanding belt; Finally, the drum is polished using a third type of abrasive belt; Among them, the mesh sizes of the first sanding belt, the second sanding belt and the third sanding belt increase successively.

9. The online repair method of a drum dryer according to claim 7, characterized in that: The online repair method further comprises performing the following steps at least once: The grinding device starts grinding from the position corresponding to the first limiting device, and moves along the axial direction of the drum driven by the moving device until the moving device touches the second limiting device. The grinding device is then driven by the moving device to run in the reverse direction until the moving device touches the first limiting device.

10. A drum dryer, characterized in that: An online repair device for a drum dryer as described in any one of claims 1 to 6 is provided; the drum of the drum dryer and the online repair device are integrated into one, or the drum and the online repair device are independently provided.

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