Outer circulation cooling device of speed reducer for continuous rolling of steel strip

Abstract

The invention provides an external circulation cooling device of a speed reducer for continuous rolling of a steel belt, which comprises the speed reducer and a cooling structure, an input shaft and an output shaft are respectively convexly extended on two opposite side surfaces of the speed reducer, the input shaft is connected with a motor through a coupler, and the output shaft is connected with a continuous rolling roller; a cooling structure is arranged at the position close to the input shaft, the cooling structure is vertically installed at the end of the speed reducer and comprises a plurality of cooling cavities, a filter screen is arranged between every two adjacent cooling cavities in a clamped mode, the cooling cavities located at the upper end and the lower end form a base and a top cover respectively, and the base is connected with a conveying pump. Oil liquid in the speed reducer is pumped into the base to be cooled, impurities are filtered out, the oil liquid flows upwards and enters the speed reducer through the top cover, a control structure is arranged in the cooling cavity, and the control structure controls pipeline switching of the conveying pump under the action of oil liquid pressure and periodically backwashes the filter screen. According to the outer circulation cooling device of the speed reducer for continuous rolling of the steel strip, the structure is simplified, and the oil cooling efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of circulating cooling, and particularly relates to an external circulating cooling device for a speed reducer used in tandem cold rolling of steel strips. Background Art

[0002] During the tandem cold rolling process of steel strips, the rolling mill rolls the continuous steel strip by continuously providing high torque power from the motor. As an essential device for increasing torque, the speed reducer generates a large amount of heat during operation and requires oil for heat absorption and lubrication. In the existing speed reducer designs, the lubrication system usually adopts an internal circulation method, that is, the lubricating oil circulates inside the speed reducer, and the rotation of gears or bearings drives the oil flow to achieve lubrication and cooling.

[0003] However, the internal circulation system has some limitations. The oil is prone to deterioration after being heated for a long time, resulting in a decrease in oil viscosity and poor lubrication performance, which exacerbates the wear of key components such as gears and bearings. At the same time, the high-temperature working environment accelerates the fatigue aging of parts and reduces the service life. There are also problems such as the inability to replace the oil during the operation of the tandem cold rolling equipment and the difficulty in controlling oil pollution. Summary of the Invention

[0004] In view of the above, it is necessary for the present invention to provide an external circulating cooling device with a simple structure that can improve the operating efficiency and service life of the speed reducer.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An external circulating cooling device for a speed reducer used in tandem cold rolling of steel strips includes a speed reducer, the interior of which is sealed, and a one-way exhaust valve is provided on the speed reducer; a cooling structure, which is vertically installed at one end of the speed reducer and includes a base and a top cover. A plurality of filter meshes are stacked between the base and the top cover, and a sealing plate is provided between adjacent filter meshes. The sealing plate and the adjacent two filter meshes enclose a cooling chamber; a delivery pump, which is arranged below the cooling structure, connects the speed reducer and the cooling structure, and extracts the oil in the speed reducer and transports it to the cooling structure; a control structure, which is installed in the cooling structure and controls the pipeline switching of the delivery pump under the action of the oil pressure, so as to control the oil in the cooling structure to backwash the filter meshes.

[0007] Optionally, the base is connected to the delivery pump. The delivery pump extracts the oil in the speed reducer and enters the cooling chamber through the base for cooling. The cooled oil is stored in the top cover, and the top cover is connected to the speed reducer to supply the oil to enter the speed reducer to absorb heat.

[0008] Optionally, the transfer pump includes an inlet pipe, a return pipe, a supply pipe, a pressure relief pipe, and a discharge pipe. The inlet pipe and the supply pipe are arranged at the end of the transfer pump for pumping oil, and the return pipe, the pressure relief pipe, and the discharge pipe are arranged at the end of the transfer pump for discharging oil. The inlet pipe and the pressure relief pipe are connected to the speed reducer, the supply pipe and the return pipe are connected to the base, and a pressure valve is arranged in the pressure relief pipe. When the pressure valve is opened, the pressure relief pipe communicates with the speed reducer, and the discharge pipe is used for discharging oil.

[0009] Optionally, a collecting member is further arranged on the return pipe, and a collecting block is installed in the collecting member for collecting impurities in the oil flowing back in the cooling cavity.

[0010] Optionally, the base includes an oil delivery pipe, the oil delivery pipe communicates with the supply pipe, a sliding pipe is arranged on the oil delivery pipe, the sliding pipe faces the return pipe, a blocking rod is installed between the sliding pipe and the return pipe, one end of the blocking rod is inserted into the sliding pipe, and the other end is close to the side wall of the base to move and block the port of the return pipe.

[0011] Optionally, each filter screen includes a central pipe, the central pipe is arranged corresponding to the oil delivery pipe, an impeller is fixedly installed at the center of the central pipe, the oil flows in the central pipe to drive the impeller to rotate, and a plurality of inclined blades are connected to the edge of each filter screen.

[0012] Optionally, the top cover includes a sealing cover, a partition plate, a plurality of telescopic pipes, and a mounting plate. The sealing cover is arranged at the center of the end face of the top cover adjacent to the filter screen, the sealing cover is buckled on the central pipe, the partition plate is arranged between the outer wall surface of the sealing cover and the inner wall surface of the top cover, a plurality of telescopic pipes are installed on the partition plate and extend upward, and one-way valves are installed in each of the plurality of telescopic pipes; the mounting plate is arranged at the lower end of the one-way valve, and the mounting plate and the top surface of the top cover cooperate to form an oil storage chamber for the oil in the cooling cavity to enter the oil storage chamber unidirectionally. A spray oil pipe is arranged on the top surface of the top cover, and the spray oil pipe communicates with the speed reducer.

[0013] Optionally, the cooling structure further includes a rotation stopping rod, the rotation stopping rod is installed in the sealing cover, one end extends upward out of the sealing cover, and the other end extends downward and is inserted into the oil delivery pipe of the base. A closing plate extends axially on the rotation stopping rod, the closing plate abuts against the bottom surface of the sealing cover, a plurality of groups of rotation stopping blocks protrude from the rotation stopping rod and are located below the sealing plate, each group of rotation stopping blocks corresponds to each cooling cavity and is clamped in the cooling cavity to prevent rotation. A groove is further arranged on the rotation stopping rod in the oil delivery pipe and corresponds to the blocking rod, and the blocking rod moves and is inserted into the groove.

[0014] Optionally, the control structure is arranged on the mounting plate and includes a second floating block, a clamping rod and a lifting block. The second floating block is arranged on the mounting plate, and a limiting tube is sleeved outside the second floating block. The limiting tube is fixed on the top surface of the mounting plate. A magnet is embedded in the second floating block facing the bottom surface of the mounting plate. The magnet adsorbs the anti-rotation rod to move. One end of the clamping rod is arranged below the second floating block, and the other end extends away from the second floating block. The lifting block is correspondingly arranged at the end of the clamping rod away from the second floating block. When the lifting block descends, it abuts against the clamping rod and moves to directly below the second floating block, blocking the second floating block from descending. A sealing plate is connected above the lifting block.

[0015] Optionally, an oil change port and a one-way air valve are arranged on the top surface of the top cover. The oil change port corresponds to the sealing plate. The sealing plate is inserted into the oil change port for sealing. The one-way air valve is arranged on the top cover, facilitating the entry of air into the oil storage chamber to balance the air pressure. As the oil liquid in the oil storage chamber descends, it drives the sealing plate to move downward synchronously to block the one-way air valve.

[0016] In summary, compared with the prior art, the present invention has at least one of the following beneficial technical effects:

[0017] 1. The flow of the oil liquid drives the filter net to rotate. The heat of the oil liquid is transferred to the filter net and then dispersed into the air through the blades of the filter net. The rotation of the blades accelerates the flow rate of the surface gas, improving the efficiency of heat dispersion. Moreover, the rotation of the filter net can slow down the flow rate of the oil liquid, absorbing the heat in the oil liquid more evenly.

[0018] 2. The control structure controls the cooling structure to periodically switch states, and uses the delivery pump to drive the oil liquid to backwash the filter net, avoiding the cooling structure from being unable to work or reducing efficiency due to the blockage of the filter net. At the same time, the cooling structure continuously cools the speed reducer, avoiding the oil liquid from being unable to continuously cool the speed reducer due to backwashing.

[0019] 3. The control structure can identify whether the oil liquid needs to be replaced, and can automatically extract new oil liquid into the oil storage chamber after the oil liquid is completely drained, avoiding the mixing of new oil liquid and old oil liquid, resulting in oil liquid pollution. In addition, there is no need to stop the machine during oil liquid replacement, improving production efficiency. Description of the Drawings

[0020] Figure 1 It is a three-dimensional view of the external circulation cooling device for the speed reducer used in strip continuous rolling;

[0021] Figure 2 It is a connection structure diagram of the cooling structure and the speed reducer;

[0022] Figure 3 It is a structure diagram of the delivery pump and the base;

[0023] Figure 4 It is a structure diagram of the filter net;

[0024] Figure 5Internal structure diagram of the cooling structure;

[0025] Figure 6 Structural diagram of the anti-rotation rod.

[0026] Explanation of reference numerals:

[0027] 1. Reducer; 2. Cooling structure; 21. Cooling chamber; 211. Fixed rod; 22. Base; 221. Oil delivery pipe; 222. Stop rod; 23. Top cover; 231. Sealing cover; 232. Partition board; 233. Telescopic pipe; 234. Mounting plate; 235. Oil storage chamber; 236. Oil injection pipe; 237. Oil change port; 238. One-way air valve; 24. Filter screen; 241. Central pipe; 242. Impeller; 25. Anti-rotation rod; 251. Sealing plate; 252. Anti-rotation block; 253. Groove; 3. Delivery pump; 31. Inlet pipe; 32. First floating block; 33. Return pipe; 34. Supply pipe; 35 Pressure relief pipe; 36. Discharge pipe; 37. Collection part; 4. Control structure; 41. Second floating block; 42. Clamping rod; 43. Lifting block; 44. Sealing plate. Detailed implementation manners

[0028] The following will detail the specific implementation manners of the present application with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for the purpose of illustrating and explaining the present application, and are not used to limit the present application.

[0029] As Figure 1 and Figure 2 shown, an external circulation cooling device for a reducer used in tandem cold rolling provided by an embodiment of the present invention includes a reducer 1 and a cooling structure 2. Input shafts and output shafts protrude from two opposite sides of the reducer 1 respectively. The input shaft is connected to a motor through a coupling, and the output shaft is connected to a tandem cold rolling roll. A cooling structure 2 is provided near the input shaft. The cooling structure 2 is vertically installed at the end of the reducer 1, and includes a base 22 and a top cover 23. A plurality of filter screens 24 are provided between the base 22 and the top cover 23. A sealing plate is provided around adjacent filter screens 24. The sealing plate and two adjacent filter screens 24 enclose a cooling chamber 21. The base 22 is connected to a delivery pump 3. A pulley is sleeved on the rotating shaft of the delivery pump 3, and a belt is sleeved on the pulley and connected to the input shaft. The input shaft drives the delivery pump 3 to rotate. The delivery pump 3 pumps the oil inside the reducer 1 into the base 22. The oil flows upward through the filter screen 24 and the cooling chamber 21, and enters the top cover 23 for temporary storage to continuously input into the reducer 1 for cooling. A control structure 4 is provided inside the top cover 23. The control structure 4 controls the pipeline switching of the delivery pump 3 under the action of the oil pressure to periodically backwash the filter screen 24.

[0030] Please refer to Figure 2 and Figure 3, one end of the transfer pump 3 is connected with an oil inlet pipe 31. The oil inlet pipe 31 is inserted into the sealed speed reducer 1 to extract the oil liquid at the bottom of the speed reducer 1. And a first floating block 32 is connected to the end of the oil inlet pipe 31. The first floating block 32 floats in the oil liquid. When the oil liquid inside the speed reducer 1 is completely extracted, the first floating block 32 blocks the port of the oil inlet pipe 31. The transfer pump 3 is also connected with an oil return pipe 33. The oil return pipe 33 is communicated with the base 22. The transfer pump 3 extracts the oil liquid in the base 22 through the oil return pipe 33 for backwashing the filter screen 24. The other end of the transfer pump 3 is provided with an oil supply pipe 34. The oil supply pipe 34 is connected to the bottom surface of the base 22 to convey the oil liquid to be cooled into the base 22. The transfer pump 3 is provided with a pressure relief pipe 35 and a discharge pipe 36, which are respectively arranged on both sides of the oil supply pipe 34. The pressure relief pipe 35 is communicated with the speed reducer 1, and a pressure valve is arranged in the pressure relief pipe 35. When the pressure reaches a certain value, the pressure valve in the pressure relief pipe 35 opens, and the oil liquid enters the speed reducer 1 through the pressure relief pipe 35; the discharge pipe 36 is used for discharging the oil liquid that needs to be replaced. Preferably in this embodiment, the speed reducer 1 is installed with a one-way exhaust valve for discharging the redundant gas inside the speed reducer 1.

[0031] Further, a collecting member 37 is also arranged on the oil return pipe 33. A collecting block is installed inside the collecting member 37. When the oil liquid flowing back in the cooling cavity 21 passes through the collecting block, the impurities floating in the oil liquid are collected, which is convenient for treatment.

[0032] An oil delivery pipe 221 is arranged inside the base 22. The oil delivery pipe 221 is set as an inner and outer double-layer pipe. The inner layer pipe is communicated with the oil supply pipe 34, and the outer layer pipe is fixedly connected to the inner layer pipe and is spaced from the bottom surface of the base 22. A sliding pipe is arranged on the outer peripheral surface of the inner layer pipe. The sliding pipe faces the oil return pipe 33; A stop rod 222 is installed between the sliding pipe and the oil return pipe 33. One end of the stop rod 222 is inserted into the sliding pipe, and the other end is close to the side wall of the base 22. After being forced to move, it blocks the port of the oil return pipe 33. And a spring is sleeved in the middle of the stop rod 222. One end of the spring is fixed on the stop rod 222, and the other end is connected with a fixing seat. The fixing seat is fixed on the bottom surface of the base 22. The spring stretches and stores energy when the stop rod 222 moves to block the oil return pipe 33, so as to drive the stop rod 222 to return to its original position.

[0033] As Figure 2 and Figure 4As shown in the figure, the filter screen 24 is rotatably connected to the base 22. It includes a central tube 241 connected to the oil delivery pipe 221. The central tube 241 is set as an inner and outer double-layer tube corresponding to the oil delivery pipe 221. An impeller 242 is fixedly installed on the inner layer tube of the central tube 241. The oil fluid flows in the central tube 241, pushing the impeller 242 to rotate. And the filter screen 24 is made of a material with good thermal conductivity (such as copper). The diameter of the filter screen 24 is larger than that of the base 22. Several inclined blades are connected to the edge of the filter screen 24 extending beyond the base 22. The filter screen 24 drives the blades to rotate, accelerating the gas flow rate on the surface of the blades, so that the filter screen 24 absorbs the heat of the oil fluid and transfers it to the blades for heat dissipation.

[0034] As Figure 5 shown in the figure, the diameter of the cooling chamber 21 is the same as that of the base 22, which is convenient for the blades of the filter screen 24 to extend outside the cooling chamber 21 for heat dissipation. The cooling chamber 21 includes a cooling pipe, which is also set as an inner and outer double-layer tube and is correspondingly connected to the central tube 241. Several fixing rods 211 are connected between the outer wall surface of the cooling pipe and the inner wall surface of the cooling chamber 21 to fix the cooling pipe stably through the several fixing rods 211. And each fixing rod 211 abuts against the surface of the filter screen 24. The rotation of the filter screen 24 causes the fixing rods 211 to scrape off the impurities adhering to the surface of the filter screen 24.

[0035] As Figure 5 and Figure 6 shown in the figure, the top cover 23 is installed above a plurality of cooling chambers 21 stacked in sequence. A cover 231 is provided at the lower end of the top cover 23 near the filter screen 24. The cover 231 is cup-shaped and buckled on the outer layer tube at the top of the central tube 241, so that the oil fluid enters the cover 231 from the inner layer tube and then flows into the base 22 along the outer layer tube. A partition 232 is connected to the outer peripheral surface of the cover 231. The partition 232 extends radially and is connected to the inner wall surface of the top cover 23. Several telescopic tubes 233 are provided on the partition 232. Each telescopic tube 233 extends towards the top surface of the top cover 23. A one-way valve is installed at one end of each telescopic tube 233 away from the partition 232 to prevent the oil fluid flowing upward through the partition 232 from flowing back. A mounting plate 234 is movably arranged in the top cover 23, and the mounting plate 234 is located below several one-way valves. An oil storage chamber 235 is formed between the mounting plate 234 and the top surface of the top cover 23. The oil storage chamber 235 is communicated with each telescopic tube 233. The telescopic movement of the several telescopic tubes 233 drives the mounting plate 234 to move vertically in the top cover 23, changing the size of the oil storage chamber 235.

[0036] The top surface of the top cover 23 is also provided with an oil spray pipe 236 communicating with the oil storage chamber 235. One end of the oil spray pipe 236 fixed on the top cover 23 is connected with a hose (not shown in the figure). The hose hangs down to the bottom surface of the oil storage chamber 235. The other end of the oil spray pipe 236 is connected to the speed reducer 1, and the cooled oil in the oil storage chamber 235 is conveyed into the speed reducer 1 and sprayed at the meshing part of the reduction gears.

[0037] Further, the cooling structure 2 further includes a rotation stopping rod 25 for fixing the cooling chamber 21 not to rotate synchronously with the filter net 24. The rotation stopping rod 25 is installed in the cover 231. One end extends upward through the cover 231 to the upper part of the cover 231, and the other end extends downward and is inserted into the oil delivery pipe 221 of the base 22. And a closing plate 251 extends axially on the rotation stopping rod 25. The closing plate 251 abuts against the bottom surface of the cover 231. A plurality of groups of rotation stopping blocks 252 protrude from the rotation stopping rod 25 and are located below the closing plate 251. Each group of rotation stopping blocks 252 corresponds to the cooling pipes of each cooling chamber 21 and is clamped in the cooling pipes to prevent rotation. A groove 253 is also provided on the rotation stopping rod 25 and is located in the oil delivery pipe 221. When the rotation stopping rod 25 moves downward, the groove 253 corresponds to the stop rod 222, and the stop rod 222 is inserted into the groove 253 under the action of the spring.

[0038] The control structure 4 is arranged on the mounting plate 234 and includes a second floating block 41. A limiting tube is sleeved outside the second floating block 41. The limiting tube is fixed on the top surface of the mounting plate 234. The second floating block 41 can float up and down in the limiting tube along with the change of the depth of the oil. A magnet is embedded in the bottom surface of the second floating block 41. When the second floating block 41 abuts against the mounting plate 234, the magnet adsorbs the rotation stopping rod 25 to move upward. A movable clamping rod 42 is installed beside the second floating block 41. The clamping rod 42 extends in a direction away from the second floating block 41. A lifting block 43 is correspondingly installed at one end of the clamping rod 42 away from the second floating block 41. The lifting block 43 can lift along with the change of the oil height. When the oil decreases, the lifting block 43 descends and abuts against the clamping rod 42 to move, and is inserted below the second floating block 41 to block the second floating block 41 from descending and abutting against the mounting plate 234. A sealing plate 44 is connected above the lifting block 43. The top cover 23 is provided with an oil change port 237. The sealing plate 44 extends into the oil change port 237 of the top cover 23. And an elastic member is arranged in the oil change port 237. One end of the elastic member is fixed to the oil change port 237, and the other end is connected to the sealing plate 44 for resetting the sealing plate 44 after movement. It can be understood that a one-way air valve 238 is also provided on the top surface of the top cover 23. The outside air pushes the one-way air valve 238 to swing and enters the top cover 23 to balance the air pressure.

[0039] The working principle of the external circulation cooling device provided by this application is as follows:

[0040] When the oil is circulated and cooled, the delivery pump 3 is started to extract the oil in the speed reducer 1 through the inlet pipe 31, and the oil enters the inner layer pipe of the oil delivery pipe 221 through the oil supply pipe 34. The oil flows upward in the inner layer pipe and enters the central pipe 241, pushing the impeller 242 to rotate, driving the filter screen 24 to rotate for heat dissipation; the oil passes through the impeller 242 and flows into the cover 231, and then enters the outer layer pipe of the central pipe 241. The oil continues to flow downward along the outer layer pipe and enters the base 22; then the oil flows upward through the rotating filter screen 24 and enters the adjacent cooling chamber 21, and so on until it enters the top cover 23, and then enters the oil storage chamber 235 through the telescopic pipe 233. A part of the oil entering the oil storage chamber 235 enters the speed reducer 1 through the oil spray pipe 232, is sprayed at the meshing part of the reduction gears, lubricates the gears and absorbs heat, and then drips to the bottom of the speed reducer 1; the other part of the oil is stored in the oil storage chamber 235. As the oil in the oil storage chamber 235 increases, the mounting plate 234 descends.

[0041] When the filter screen 24 is backflushed with oil, the mounting plate 234 descends to abut against the anti-rotation rod 25 and drive the closing plate 251 to descend synchronously to block the central pipe 241. At the same time, the groove 253 descends to correspond to the stop rod 222, and the stop rod 222 is inserted into the groove 253 under the action of the spring, releasing the blockage of the return pipe 33. The delivery pump 3 extracts the oil in the base 22 through the return pipe 33 for reflux. The refluxed oil flushes the filter screen 24 and then enters the return pipe 33, and the impurities in the oil are collected by the collecting member 37; then the delivery pump 3 sends the oil in the return pipe 33 into the pressure relief pipe 35, pushing open the pressure valve and refluxing into the speed reducer 1. At the same time, the mounting plate 234 is always at the lowest position under the negative pressure generated by the oil reflux, and the delivery pump 3 continuously sucks the oil in the speed reducer 1 through the inlet pipe 31, generating a negative pressure in the speed reducer 1, and then extracting the oil in the oil storage chamber 235 and continuously spraying it at the gear meshing part. The oil storage chamber 235 supplies air through the one-way air valve 238 to keep the pressure in the oil storage chamber 235 normal. After the oil in the oil storage chamber 235 is completely extracted, the second floating block 41 descends to abut against the mounting plate 234, and the magnet in the second floating block 41 adsorbs the anti-rotation rod 25 to rise and insert into the mounting plate 234, opening the blockage of the central pipe 241, abutting against the stop rod 222 to re-block the return pipe 33, and the oil starts to cool and circulate again.

[0042] When the oil needs to be replaced, first insert the oil pot filled with new oil into the oil change port 237, push against the sealing plate 44 to move it downward. Then, when the oil storage chamber 235 is full of oil, open the discharge pipe 36, and the transfer pump 3 pumps out the oil in the cooling structure 2 and the speed reducer 1 through the discharge pipe 36. When all the oil in several cooling chambers 21 and the speed reducer 1 is discharged, there is still a small amount of oil left in the oil storage chamber 235. The transfer pump 3 continuously pumps out the oil in the oil storage chamber 235. As the oil decreases, the second floating block 41 and the lifting block 43 descend synchronously. The lifting block 43 descends and pushes the latch rod 42 to move and insert under the second floating block 41, blocking the second floating block 41 from contacting the mounting plate 234. When the oil in the oil storage chamber 235 is completely pumped out, the lifting block 43 contacts the mounting plate 234, drives the sealing plate 44 to move downward to block the one-way air valve 238. Then, the transfer pump 3 continuously pumps out the oil in the oil storage chamber 235 that enters the speed reducer 1, thereby driving the oil storage chamber 235 to generate negative pressure. The negative pressure adsorbs the sealing plate 44 to move downward, releasing the seal of the oil change port 237, and the oil in the oil pot enters the oil storage chamber 235 to continue supplying oil for cooling the reduction gear. And when the oil in the speed reducer 1 is completely pumped out, the first floating block 32 blocks the inlet pipe 31, so that the replaced oil cannot be pumped out by the transfer pump 3 after entering the speed reducer 1. At this time, the pressure valve of the adsorption relief pipe 35 of the transfer pump 3 is opened to pump out the air in the speed reducer 1 to keep the oil in the oil pot continuously entering. When the oil in the speed reducer 1 increases, it supports the first floating block 32 to float and opens the blockage of the inlet pipe 31; at the same time, the discharge pipe 36 is closed so that the oil circulates and cools again. When all the oil in the oil pot enters the oil storage chamber 235, take out the oil pot, and the sealing plate 44 returns to its original position under the action of the elastic member and cannot push the latch rod 42 to move and insert under the second floating block 41 when the oil in the oil storage chamber 235 is completely pumped out again.

[0043] The above embodiments only illustrate the implementation manners of the present invention, but should not be construed as limiting the scope of the invention patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent of the present invention shall be subject to the appended claims.

Claims

1. An external circulation cooling device for a speed reducer used in tandem cold rolling of steel strips, characterized in that, include: A reducer (1), wherein the reducer (1) is sealed internally and a one-way exhaust valve is provided on the reducer (1); A cooling structure (2), the cooling structure (2) being vertically mounted at one end of the reducer (1), comprising a base (22) and a top cover (23), a plurality of filter screens (24) being stacked between the base (22) and the top cover (23), a sealing plate being arranged between two adjacent filter screens (24), and the sealing plate and the two adjacent filter screens (24) forming a cooling chamber (21); A delivery pump (3), the delivery pump (3) being arranged below the cooling structure (2), connecting the reducer (1) and the cooling structure (2), and extracting oil from the reducer (1) and delivering it to the cooling structure (2); A control structure (4) is installed in the cooling structure (2). The control structure (4) controls the pipeline switching of the delivery pump (3) under the action of oil pressure, so as to control the oil in the cooling structure (2) to backwash the filter screen (24).

2. The external circulation cooling device of the speed reducer for tandem cold rolling of steel strips according to claim 1, characterized in that, The base (22) is connected to the delivery pump (3), and the delivery pump (3) draws oil from the reducer (1) through the base (22) into the cooling chamber (21) for cooling. The cooled oil is stored in the top cover (23), and the top cover (23) is connected to the reducer (1) so that the oil can enter the reducer (1) to absorb heat.

3. The external circulation cooling device of the speed reducer for tandem cold rolling of steel strips according to claim 2, wherein, The delivery pump (3) comprises an oil inlet pipe (31), an oil return pipe (33), an oil supply pipe (34), a pressure relief pipe (35) and a discharge pipe (36); the oil inlet pipe (31) and the oil supply pipe (34) are arranged at one end of the delivery pump (3) for pumping oil; the oil return pipe (33), the pressure relief pipe (35) and the discharge pipe (36) are arranged at one end of the delivery pump (3) for discharging oil; the oil inlet pipe (31) and the pressure relief pipe (35) are connected to the reducer (1); the oil supply pipe (34) and the oil return pipe (33) are connected to the base (22); a pressure valve is arranged in the pressure relief pipe (35); when the pressure valve is opened, the pressure relief pipe (35) is connected to the reducer (1); and the discharge pipe (36) is used for discharging oil.

4. The external circulation cooling device of the speed reducer for tandem cold rolling of steel strips according to claim 3, characterized in that, The oil return pipe (33) is also provided with a collecting piece (37), and a collecting block is installed in the collecting piece (37) for collecting impurities in the oil returning from the cooling chamber (21).

5. The external circulation cooling device for the speed reducer used in tandem cold rolling of steel strips according to claim 3, characterized in that, The base (22) comprises an oil delivery pipe (221), the oil delivery pipe (221) is connected to the oil supply pipe (34), a sliding pipe is provided on the oil delivery pipe (221), the sliding pipe faces the oil return pipe (33), a blocking rod (222) is installed between the sliding pipe and the oil return pipe (33), one end of the blocking rod (222) is inserted into the sliding pipe, and the other end is close to the side wall of the base (22), and moves to block the port of the oil return pipe (33).

6. The external circulation cooling device of the speed reducer for tandem cold rolling of steel strips according to claim 5, characterized in that, Each filter screen (24) comprises a central tube (241), the central tube (241) being arranged corresponding to the oil delivery pipe (221), an impeller (242) being fixedly installed at the center of the central tube (241), oil flows in the central tube (241) to drive the impeller (242) to rotate, and a plurality of inclined blades are connected to the edge of each filter screen (24).

7. The external circulation cooling device of the speed reducer for tandem cold rolling of steel strips according to claim 6, characterized in that, The top cover (23) includes a sealing cover (231), a partition plate (232), a plurality of telescopic tubes (233), and a mounting plate (234). The sealing cover (231) is arranged at the center of the adjacent end face of the top cover (23) and the filter net (24), and the sealing cover (231) is buckled on the central tube (241). The partition plate (232) is arranged between the outer wall surface of the sealing cover (231) and the inner wall surface of the top cover (23). A plurality of telescopic tubes (233) are installed on the partition plate (232) and extend upward, and one-way valves are installed in each of the plurality of telescopic tubes (233). The mounting plate (234) is arranged at the lower end of the one-way valve. The mounting plate (234) and the top surface of the top cover (23) cooperate to form an oil storage chamber (235) for the oil in the cooling chamber (21) to enter the oil storage chamber (235) unidirectionally. A fuel injection pipe (236) is arranged on the top surface of the top cover (23), and the fuel injection pipe (236) is communicated with the speed reducer (1).

8. The external circulation cooling device for the speed reducer used in tandem cold rolling of steel strips according to claim 7, characterized in that, The cooling structure (2) further includes a rotation stopping rod (25). The rotation stopping rod (25) is installed in the sealing cover (231), one end extends upward out of the sealing cover (231), and the other end extends downward and is inserted into the oil delivery pipe (221) of the base (22). A closing plate (251) extends axially on the rotation stopping rod (25), and the closing plate (251) abuts against the bottom surface of the sealing cover (231). A plurality of groups of rotation stopping blocks (252) protrude from the rotation stopping rod (25) and are located below the closing plate (251). Each group of rotation stopping blocks (252) corresponds to each cooling chamber (21) and is clamped in the cooling chamber (21) to prevent rotation. A groove (253) is also arranged on the rotation stopping rod (25) and corresponds to the stop rod (222) in the oil delivery pipe (221), and the stop rod (222) moves and is inserted into the groove (253).

9. The external circulation cooling device for the speed reducer used in tandem cold rolling of steel strips according to claim 8, wherein, The control structure (4) is arranged on the mounting plate (234) and includes a second floating block (41), a clamping rod (42), and a lifting block (43). The second floating block (41) is arranged on the mounting plate (234). A limiting tube is sleeved outside the second floating block (41), and the limiting tube is fixed on the top surface of the mounting plate (234). A magnet is embedded on the bottom surface of the second floating block (41) facing the mounting plate (234), and the magnet adsorbs the rotation stopping rod (25) to move. One end of the clamping rod (42) is arranged below the second floating block (41), and the other end extends in a direction away from the second floating block (41). The lifting block (43) is correspondingly arranged at the end of the clamping rod (42) away from the second floating block (41). The lifting block (43) descends to abut against the clamping rod (42) and moves to directly below the second floating block (41) to block the second floating block (41) from descending. A sealing plate (44) is connected above the lifting block (43).

10. The external circulation cooling device for the speed reducer used in tandem cold rolling of steel strips according to claim 9, characterized in that, A oil change port (237) and a one-way air valve (238) are arranged on the top surface of the top cover (23). The oil change port (237) corresponds to the sealing plate (44), and the sealing plate (44) is inserted into the oil change port (237) for sealing. The one-way air valve (238) is arranged on the top cover (23) to facilitate air to enter the oil storage chamber (235) to balance the air pressure. When the oil level in the oil storage chamber (235) drops, the sealing plate (44) moves downward synchronously to block the one-way air valve (238).

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