Heavy alkali belt conveyor

Abstract

The utility model relates to the technical field of combined caustic soda production equipment, in particular to a heavy caustic soda belt conveyor which comprises a rack, a conveying belt and a control system. A tensioning roller, a carrier roller and a driving roller are sequentially arranged on the machine frame in the axial direction, the machine frame is further provided with a detection device used for detecting stress borne by the conveying belt, the tensioning roller, the carrier roller and the driving roller are all located on the inner side of the conveying belt, and a containing area capable of containing a drooping part of the conveying belt is arranged between the tensioning roller and the carrier roller on the machine frame. The falling point of raw materials entering the belt conveyor is located in the containing area, two motors are installed on the machine frame, and output shafts of the two motors are connected with two input shafts on the driving roller respectively. According to the belt conveyor, the tensioning roller stress detection device is arranged, the two motors are matched, and the two motors operate independently, so that the rotating speed of the motors can be readjusted when the belt conveyor is in a low-load state and a no-load state to reduce energy waste, and meanwhile the problem that the overall conveying efficiency of the belt conveyor is poor due to damage of the motors can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of combined alkali production equipment, and in particular to a heavy alkali belt conveyor. Background Art

[0002] In the production of combined alkali, belt conveyors are required to transport heavy alkali materials. The traditional transportation control method is to use the central controller PLC to control the start and stop sequence of each belt conveyor through the frequency converter. When the belt conveyor reaches the rated belt speed, the frequency converter will lose control of the motor, and the belt conveyor will run at a constant speed according to the designed belt speed, thereby causing waste of electric energy under no-load or light-load conditions. Controlling the motor through the frequency converter can easily cause damage to the motor, which will also reduce the expected working efficiency of the belt conveyor. Summary of the invention

[0003] In response to the shortcomings of the prior art, the present application provides a heavy alkali belt conveyor. The embodiment of the present application is to set a tensioning roller stress detection device and match two motors. The two motors operate independently, so that the belt conveyor can readjust the motor speed when under low load and no load to reduce energy waste. At the same time, it can also deal with the problem of overall transmission efficiency of the belt conveyor caused by motor damage.

[0004] The above application objectives of this application are achieved through the following technical solutions:

[0005] A heavy alkali belt conveyor, comprising a frame, a conveyor belt and a control system;

[0006] The frame is provided with a tensioning roller, an idler roller and a driving roller in sequence along the axial direction. The frame is also provided with a detection device for detecting the stress of the conveyor belt. The tensioning roller, the idler roller and the driving roller are all located inside the conveyor belt. There is a receiving area between the tensioning roller and the idler roller on the frame for receiving the sagging part of the conveyor belt. The landing point of the raw material entering the belt conveyor is located in the receiving area. Two motors are installed on the frame, and the output shafts of the two motors are respectively connected to the two input shafts on the driving roller;

[0007] The control system includes a controller, a frequency converter and two connecting switches. The frequency converter, the detection device and the two connecting switches are all connected to the controller signal. The frequency converter outputs current to the two motors respectively through the two connecting switches. The controller independently controls the opening and closing of the two connecting switches through the data transmitted by the detection device.

[0008] Optionally, the working surface width of the tensioning roller is greater than the width of the conveyor belt.

[0009] Optionally, the detection device includes a support mounted on the frame, a bearing is arranged on the inner side of the support, the end of the tensioning roller is located in the bearing, a pressure sensor is arranged between the bearing and the support, the pressure sensor is located on the side of the bearing close to the roller, and the pressure sensor is connected to the controller signal.

[0010] Optionally, when the plane where the bottom of the frame is located is taken as the reference plane, the distance between the top of the tensioning roller and the reference plane is greater than the distance between the top of the supporting roller and the reference plane.

[0011] Optionally, in a stationary installation state, there is a gap between the inner side of the conveyor belt and the roller, and the roller does not contact the inner side of the conveyor belt.

[0012] Optionally, an electronically controlled clutch is provided between the motor output shaft and the drive roller input shaft, and the electronically controlled clutch is connected to the controller signal.

[0013] In summary, this application has the following beneficial technical effects:

[0014] The embodiment of the present application is to provide a tensioning roller stress detection device and two matching motors, so that the two motors operate independently, so that the belt conveyor can readjust the motor speed when under low load and no load to reduce energy waste, and can also deal with the problem of overall transmission efficiency of the belt conveyor caused by motor damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view schematic diagram of an embodiment of the present application;

[0016] Figure 2 is an internal schematic diagram of an implementation method of the present application;

[0017] Figure 3 is a schematic diagram of a detection device according to an embodiment of the present application;

[0018] Figure 4 It is a control schematic diagram of an implementation method of the present application.

[0019] Reference numerals: 11, frame; 12, conveyor belt; 13, tension roller; 14, support roller; 15, driving roller; 16, accommodating area; 17, motor;

[0020] 21. Detection device; 22. Support; 23. Bearing; 24. Pressure sensor;

[0021] 31. Controller; 32. Frequency converter; 33. Connecting switch; 34. Electronically controlled clutch. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-4 This application is described in further detail.

[0023] The embodiment of the present application provides a heavy alkali belt conveyor, including a frame 11 and a control system, and a conveyor belt 12 for transmitting materials is sleeved on the outer side of the frame 11;

[0024] The frame 11 is provided with a tensioning roller 13, an idler roller 14 and a driving roller 15 in sequence along the axial direction. The tensioning roller 13, the idler roller 14 and the driving roller 15 are respectively connected to the frame 11 for rotation, wherein the number of the idler roller 14 may be multiple, the tensioning roller 13, the idler roller 14 and the driving roller 15 are all located on the inner side of the conveyor belt 12, and the tensioning roller 13 and the driving roller 15 make the conveyor belt 12 rotate on the outer side of the frame 11, and the frame 11 is provided with a receiving area 16, and the receiving area 16 is located between the tensioning wheel and the idler roller 14, and the landing point of the raw material entering the belt conveyor is located in the receiving area 16, when there are more materials on the receiving area 16, the conveyor belt 12 is caused to sag, and the receiving area 16 can accommodate the sag part of the conveyor belt 12, and the frame 11 is also provided with a detection device 21 for detecting the stress of the conveyor belt 12;

[0025] Input shafts are arranged at both ends of the driving roller 15. Two independent motors 17 are installed on the frame 11. The output shafts of the two motors 17 are respectively connected to the two input shafts on the driving roller 15. The rotation of the motor 17 causes the driving roller 15 to drive the conveyor belt 12 to rotate.

[0026] The control system includes a controller 31, a frequency converter 32 and two connection switches 33. The two motors 17 are electrically connected to the frequency converter 32 through the two connection switches 33. The input current of the motor 17 is transmitted by the frequency converter 32 through the connection switches 33. When the connection switch 33 is turned on, the frequency converter 32 can control the current output to the motor 17. When the connection switch 33 is turned off, the motor 17 is isolated from the frequency converter 32.

[0027] The frequency converter 32, the detection device 21 and the two connecting switches 33 are all connected to the controller 31 signal. The controller 31 can be used to receive the stress information of the tensioning roller 13 provided by the detection device 21. The controller 31 controls the on and off of the two connecting switches 33 through the stress information of the tensioning roller 13. The controller 31 is also used to reset the frequency converter 32.

[0028] The following is a further introduction based on specific usage scenarios.

[0029] For the convenience of description, the motor 17 currently in use among the two motors 17 is referred to as a working motor 17 , and the motor 17 currently in an idle state is defined as an idle motor 17 .

[0030] When in use, the working motor 17 is started, the idle motor 17 is on standby, and the heavy alkali material enters the landing area 16 of the belt conveyor. The frequency converter 32 continuously increases the input current of the working motor 17 according to the continuous feeding of the material. When the average input amount of the heavy alkali material reaches the peak value, the input current of the working motor 17 reaches the highest and tends to be constant. At this time, if the input current of the working motor 17 is reduced through the frequency converter 32, the speed of the working motor 17 will not match the input current, which may damage the frequency converter 32. In addition, when the working motor 17 has input current, it will slow down from the peak speed or rated speed, which will cause the cooling air volume to decrease proportionally with the cube of the speed, making the low-speed cooling state of the working motor 17 significantly worse, and the temperature rise will increase sharply, which will seriously cause damage to the working motor 17. Therefore, the frequency converter 32 cannot be used to directly reduce the speed of the working motor 17 when the working motor 17 is at the peak or rated speed and input current.

[0031] In the embodiment of the present application, when the instantaneous amount of material entering the belt conveyor is large, since its landing point is located in the accommodating area 16, the conveyor belt 12 in the accommodating area 16 will fall, and the stress on the tensioning roller 13 will increase. The detection device 21 detects the stress on the tensioning roller 13 and transmits the stress information of the tensioning roller 13 to the controller 31. The controller 31 outputs an instruction to the frequency converter 32, so that the current output by the frequency converter 32 to the working motor 17 gradually increases until the working motor 17 reaches the peak or rated speed. When the speed enters When the instantaneous amount of material entering the belt conveyor is small, the detection device 21 detects that the stress on the tensioning roller 13 does not match its current rotational speed and input current. The controller 31 identifies the force signal of the tensioning roller 13 transmitted by the detection device 21, and directly closes the connection switch 33 of the current working motor 17 of the belt conveyor, so that the working motor 17 and the frequency converter 32 are disconnected. At the same time, the controller 31 opens the connection switch 33 of the idle motor 17, so that the frequency converter 32 starts the idle motor 17, and the controller 31 resets the working state of the frequency converter 32.

[0032] In the above process, the idle motor 17 is transformed into the working motor 17, and the speed of the working motor 17 transformed from the idle motor 17 is controlled by the frequency converter 32 from zero, so that the working motor 17 transformed from the idle motor 17 can be re-adapted to the transmission of lower weight materials. After the previous working motor 17 is disconnected from the frequency converter 32, its own rotation will not affect the operation of the frequency converter 32.

[0033] Of course, when the stress on the tensioning roller 13 exceeds the standard, the controller 31 detects the signal sent by the detection device 21, and the controller 31 can open the connection switch 33 of the two motors 17 to enable the inverter 32 to drive the two motors 17 to work simultaneously to increase the torque of the driving roller 15.

[0034] Obviously, when one of the motors 17 fails, the controller 31 can also turn on the switch of the other motor 17 to put the failed motor 17 into an idle state, and the entire belt transmission line will not stop.

[0035] In general, the embodiment of the present application is to set a stress detection device 21 for the tensioning roller 13 and to match two motors 17 so that the two motors 17 operate independently, so that the belt conveyor can readjust the speed of the motor 17 when under low load and no load to reduce energy waste. At the same time, it can also deal with the problem of overall transmission efficiency of the belt conveyor caused by damage to the motor 17.

[0036] The detection device 21 is used to detect the stress of the conveyor belt 12 on the tensioning roller 13. In the embodiment of the present application, the working surface width of the tensioning roller 13 may be greater than the width of the conveyor belt 12, so that the detection device 21 can more accurately and comprehensively detect the stress on the tensioning roller 13.

[0037] As a feasible specific implementation method of the embodiment of the present application, the detection device 21 includes two supports 22 installed on the frame 11, and the two supports 22 are respectively distributed at both ends of the tensioning roller 13. A bearing 23 is arranged on the inner side of the support 22. The end of the tensioning roller 13 is inserted into the bearing 23 and is rotatably connected to the support 22 through the bearing 23. A pressure sensor 24 is arranged between the bearing 23 and the support 22. The pressure sensor 24 is located on the side of the bearing 23 close to the roller 14, and the pressure sensor 24 is connected to the controller 31 signal.

[0038] In combination with a specific usage scenario, when the conveyor belt 12 in the accommodating area 16 falls, the conveyor belt 12 will pull the tensioning roller 13, applying a stress to the tensioning roller 13 in the direction of the supporting roller 14. The pressure sensor 24 can identify the stress on the tensioning roller 13 and transmit this part of the stress to the controller 31.

[0039] As a feasible specific implementation method of the embodiment of the present application, when the plane where the bottom of the frame 11 is located is taken as the reference plane, the distance between the top of the tensioning roller 13 and the reference plane is greater than the distance between the top of the roller 14 and the reference plane, that is, when the assembly is completed, the tensioning roller 13 tensions the conveyor belt 12, so that the tensioning roller 13 can withstand most of the stress of the conveyor belt 12, so that the detection device 21 on the tensioning roller 13 can accurately detect the stress to which the tensioning roller 13 is subjected at this time.

[0040] In a feasible specific implementation method of the embodiment of the present application, in a static installation state, there is a gap between the inner side of the conveyor belt 12 and the roller 14, and the roller 14 does not contact the inner side of the conveyor belt 12. When the motor 17 is started to make the driving roller 15 drive the conveyor belt 12 to rotate, the roller 14 does not contact the inner side of the conveyor belt 12. When the material falls onto the conveyor belt 12 and causes the conveyor belt 12 in the receiving area 16 to have a tendency to fall, the detection device 21 on the tensioning roller 13 can accurately detect the stress on the tensioning roller 13 at this time, avoiding The roller 14 interferes with the detection of the detection device 21. After there is material on the conveyor belt 12, the conveyor belt 12 falls and contacts the roller 14. The roller 14 normally supports the conveyor belt 12. However, there is no interference from the roller 14 inside the accommodating area 16. The falling point of the material entering the belt conveyor is located in the accommodating area 16. The conveyor belt 12 located in the accommodating area 16 falls so that there is no supporting object except the tensioning roller 13 and the roller 14 at the edge. At this time, the detection device 21 outside the tensioning roller 13 can more accurately detect the stress on the tensioning roller 13 at this time.

[0041] As a feasible specific implementation method of the embodiment of the present application, an electronically controlled clutch 34 is arranged between the output shaft of the motor 17 and the input shaft of the drive roller 15, and the electronically controlled clutch 34 is connected to the controller 31 by signal. When a motor 17 needs to exit the working state and be idle, the controller 31 can disconnect the electronically controlled clutch 34 of the output shaft of the motor 17, so that the output shaft is disconnected from the input shaft of the drive roller 15, thereby reducing the probability of damage to the motor 17.

[0042] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A heavy alkali belt conveyor, comprising a frame (11), a conveyor belt (12) and a control system, characterized in that: The frame (11) is provided with a tensioning roller (13), an idler roller (14) and a driving roller (15) in sequence along the axial direction. The frame (11) is also provided with a detection device (21) for detecting the stress of the conveyor belt (12). The tensioning roller (13), the idler roller (14) and the driving roller (15) are all located inside the conveyor belt (12). A receiving area (16) for receiving the drooping part of the conveyor belt (12) is provided between the tensioning roller (13) and the idler roller (14) on the frame (11). The landing point of the raw material entering the belt conveyor is located in the receiving area (16). Two motors (17) are installed on the frame (11). The output shafts of the two motors (17) are respectively connected to the two input shafts on the driving roller (15); The control system comprises a controller (31), a frequency converter (32) and two connection switches (33); the frequency converter (32), a detection device (21) and the two connection switches (33) are all connected to the controller (31) by signals; the frequency converter (32) outputs current to two motors (17) respectively through the two connection switches (33); and the controller (31) independently controls the opening and closing of the two connection switches (33) through data transmitted by the detection device (21).

2. A heavy alkali belt conveyor according to claim 1, characterized in that: The working surface width of the tension roller (13) is greater than the width of the conveyor belt (12).

3. A heavy alkali belt conveyor according to claim 2, characterized in that: The detection device (21) comprises a support (22) mounted on a frame (11), a bearing (23) is arranged on the inner side of the support (22), an end of the tensioning roller (13) is located in the bearing (23), a pressure sensor (24) is arranged between the bearing (23) and the support (22), the pressure sensor (24) is located on a side of the bearing (23) close to the roller (14), and the pressure sensor (24) is connected to a controller (31) by signal.

4. A heavy alkali belt conveyor according to claim 1, characterized in that: When the plane where the bottom of the frame (11) is located is taken as the reference plane, the distance between the top of the tensioning roller (13) and the reference plane is greater than the distance between the top of the supporting roller (14) and the reference plane.

5. A heavy alkali belt conveyor according to claim 4, characterized in that: In a static installation state, there is a gap between the inner side of the conveyor belt (12) and the support roller (14), and the support roller (14) does not contact the inner side of the conveyor belt (12).

6. A heavy alkali belt conveyor according to claim 1, characterized in that: An electric-controlled clutch (34) is arranged between the output shaft of the motor (17) and the input shaft of the driving roller (15), and the electric-controlled clutch (34) is connected to the controller (31) by signal.

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