Bucket wheel stacker reclaimer transport belt tensioning device and control method

Abstract

The present invention provides a bucket wheel stacker reclaimer conveyor belt tensioning device and control method, and relates to the bucket wheel stacker reclaimer technical field. The bucket wheel stacker reclaimer conveyor belt tensioning device comprises a tensioning oil cylinder, an oil cylinder seat, a tensioning transmission mechanism, a hydraulic station and an electronic control unit. The bucket wheel stacker reclaimer conveyor belt tensioning device and control method, when the bucket wheel stacker reclaimer is in a stacking working mode or a reclaiming working mode, the conveyor belt is lifted or lowered along with the bucket wheel stacker reclaimer, and the conveyor belt is shortened or extended in the horizontal direction, and the tension of the conveyor belt can be automatically adjusted in real time without stopping the machine to prevent the belt from falling off; in addition, through the cooperation of a hydraulically controlled reversing valve, a safety valve, an overflow valve and a hydraulic oil circuit, the conveyor belt can be prevented from slipping when starting.

Description

Technical Field

[0001] The invention relates to the technical field of bucket wheel stacker reclaimers, in particular to a bucket wheel stacker reclaimer conveyor belt tensioning device and a control method. Background Art

[0002] Bucket wheel stacker-reclaimer is mainly used for the storage and excavation of bulk materials. It can not only take materials away from the storage yard through the rotating bucket wheel, but also store the incoming materials in the material yard through the reverse operation of the cantilever belt conveyor. It is a continuous and efficient stacking and reclaiming loading and unloading equipment. It works with a transport belt that can run in both directions, and the tail of the belt can be raised or lowered to cooperate with the bucket wheel stacker-reclaimer to complete the stacking and reclaiming process.

[0003] The existing bucket wheel stacker and reclaimer and transport belt have the following problems: 1. When the bucket wheel stacker and reclaimer needs to be lifted, the tensioning system of the transport belt is in a tensioned state. The transport belt needs to overcome resistance including the gravity of the lifting equipment, the gravity of the belt itself, and the tensioning force of the tensioning system when it is lifted along with the bucket wheel stacker and reclaimer. The bucket wheel stacker and reclaimer and the transport belt need to be stopped, and the tensioning of the tensioning system needs to be released. After the bucket wheel stacker and reclaimer and the transport belt are lifted and restarted, the tensioning of the tensioning system needs to be restarted. 2. When the bucket wheel stacker and reclaimer needs to be lowered, the transport belt will be lowered along with the bucket wheel stacker and reclaimer, and the belts will overlap, which will bring inconvenience to the transportation operation. The bucket wheel stacker and reclaimer and the transport belt also need to be stopped first; and when the bucket wheel stacker and reclaimer is lowered, due to the overlap of the belts, the original tensioning force cannot restore the tensioning of the belts in time. Summary of the invention

[0004] The object of the present invention is to provide a conveyor belt tensioning device and a control method for a bucket wheel stacker reclaimer, so as to automatically adjust the tension of the conveyor belt in real time according to the working mode of the bucket wheel stacker reclaimer without stopping the machine.

[0005] In order to achieve the above object, the technical solutions adopted by the present invention are as follows:

[0006] A bucket wheel stacker reclaimer conveyor belt tensioning device comprises a tensioning oil cylinder, an oil cylinder seat, a tensioning transmission mechanism, a hydraulic station and an electronic control unit;

[0007] The cylinder body end of the tensioning oil cylinder is arranged on the oil cylinder seat, and the telescopic rod end of the tensioning oil cylinder is connected to the transport belt via the tensioning transmission mechanism;

[0008] The hydraulic station includes a first hydraulic oil circuit, a second hydraulic oil circuit, a third hydraulic oil circuit, a fourth hydraulic oil circuit, a fifth hydraulic oil circuit, a sixth hydraulic oil circuit, a seventh hydraulic oil circuit, a hydraulic oil tank, an electromagnetic reversing valve, a hydraulic pump, a drive motor, a check valve, a safety valve, a hydraulically controlled check valve, an accumulator, a stop valve, a pressure sensor and a relief valve;

[0009] One end of the first hydraulic oil circuit is connected to the hydraulic oil tank, the other end of the first hydraulic oil circuit is connected to the V1 port of the electromagnetic reversing valve, the first hydraulic oil circuit is connected to the hydraulic pump and the one-way valve in sequence from one end to the other end, and the driving motor is connected to the driving end of the hydraulic pump;

[0010] One end of the second hydraulic oil circuit is connected to the V2 port of the electromagnetic reversing valve, and the other end of the second hydraulic oil circuit is connected to the hydraulic oil tank;

[0011] The liquid inlet end of the safety valve is connected to the first hydraulic oil circuit, and the liquid outlet end of the safety valve is connected to the second hydraulic oil circuit;

[0012] One end of the third hydraulic oil circuit is connected to the C1 port of the electromagnetic reversing valve, the other end of the third hydraulic oil circuit is connected to the rod chamber end of the tensioning oil cylinder, and the hydraulically controlled one-way valve is connected to the third hydraulic oil circuit;

[0013] One end of the fourth hydraulic oil circuit is connected to the C2 port of the electromagnetic reversing valve, and the other end of the fourth hydraulic oil circuit is connected to the rodless chamber end of the tensioning cylinder;

[0014] One end of the fifth hydraulic oil circuit is connected to the fourth hydraulic oil circuit, and the other end of the fifth hydraulic oil circuit is connected to the hydraulic control end of the hydraulic control one-way valve;

[0015] One end of the sixth hydraulic oil circuit is connected to the third hydraulic oil circuit between the hydraulically controlled one-way valve and the tensioning oil cylinder, the other end of the sixth hydraulic oil circuit is connected to the hydraulic oil tank, the sixth hydraulic oil circuit is connected to an accumulator and a stop valve in sequence, and the sixth hydraulic oil circuit is connected to a pressure sensor;

[0016] One end of the seventh hydraulic oil circuit is connected to the sixth hydraulic oil circuit, the other end of the seventh hydraulic oil circuit is connected to the hydraulic oil tank, and the seventh hydraulic oil circuit is connected to a relief valve;

[0017] The electronic control unit is connected to the control end of the drive motor, the control end of the electromagnetic reversing valve and the pressure sensor via signal cables respectively.

[0018] Preferably, it also includes a hydraulically controlled reversing valve and an eighth hydraulic oil circuit, the hydraulically controlled reversing valve being arranged in the seventh hydraulic oil circuit between the overflow valve and the hydraulic oil tank, one end of the eighth hydraulic oil circuit being connected to the first hydraulic oil circuit at the rear end of the hydraulic pump, and the other end of the eighth hydraulic oil circuit being connected to the hydraulic control end of the hydraulically controlled reversing valve.

[0019] Preferably, the tensioning transmission mechanism includes a tensioning trolley, a pulley block, a tensioning rope and a rope seat; the tensioning trolley is connected to one end of the conveying belt, the pulley block is arranged at the telescopic rod end of the tensioning cylinder, one end of the tensioning rope is connected to the rope seat, and the other end of the tensioning rope is connected to the tensioning trolley via the pulley block.

[0020] Preferably, a throttle valve is connected to the fourth hydraulic oil circuit.

[0021] Preferably, a pressure gauge is connected to the first hydraulic oil circuit at the rear end of the hydraulic pump.

[0022] Preferably, an oil suction filter is connected to the first hydraulic oil circuit at the front end of the hydraulic pump.

[0023] Preferably, a fine filter is connected to the first hydraulic oil circuit at the rear end of the hydraulic pump.

[0024] Preferably, an air filter is connected to the air inlet end of the hydraulic oil tank.

[0025] Preferably, the electronic control unit is configured as a PLC controller.

[0026] A bucket wheel stacker reclaimer transport belt tensioning control method, using the bucket wheel stacker reclaimer transport belt tensioning device;

[0027] The method can selectively enter the following three modes:

[0028] Mode 1: Normal operation, tensioning and pressure maintenance

[0029] The electronic control unit triggers the electromagnetic reversing valve to switch to the first state position. When the electromagnetic reversing valve is in the first state position, the V1 port is connected to the C1 port, and the V2 port is connected to the C2 port. The electronic control unit triggers the drive motor to start, and the drive motor drives the hydraulic pump to operate to provide pressure oil through the first hydraulic oil circuit.

[0030] The pressure oil enters the rod chamber of the tensioning oil cylinder through the third hydraulic oil circuit, and the pressure oil in the rodless chamber of the tensioning oil cylinder returns to the hydraulic oil tank through the fourth hydraulic oil circuit and the second hydraulic oil circuit. The telescopic rod end of the tensioning oil cylinder contracts relative to the cylinder body end, and the telescopic rod end of the tensioning oil cylinder tensions the conveying belt through the tensioning transmission mechanism;

[0031] Part of the pressure oil is stored in the accumulator through the sixth hydraulic oil circuit;

[0032] The pressure sensor detects the oil pressure of the sixth hydraulic oil circuit in real time. When the oil pressure detected by the pressure sensor rises to the upper limit oil pressure value P set by the electronic control unit, max When the ECU triggers the drive motor to stop;

[0033] Part of the pressure oil stored in the accumulator supplements the system oil pressure loss, and the hydraulically controlled one-way valve cuts off the third hydraulic oil circuit to maintain the current posture of the telescopic rod end of the tensioning cylinder contracted relative to the cylinder end;

[0034] When the oil pressure detected by the pressure sensor drops to the lower limit oil pressure value P set by the electronic control unit min When the oil pressure detected by the pressure sensor reaches the upper limit oil pressure value P set by the electronic control unit, the electronic control unit triggers the drive motor to start. max ;

[0035] Among them, the third hydraulic oil circuit pressure oil pressure P z At the lower limit oil pressure value P min and upper limit oil pressure value P max between;

[0036] Mode 2: Stacking switch tensioning

[0037] The electronic control unit triggers the electromagnetic reversing valve to switch to the second state position. When the electromagnetic reversing valve is in the second state position, the V1 port is connected to the C2 port, and the V2 port is connected to the C1 port. The electronic control unit triggers the drive motor to start, and the drive motor drives the hydraulic pump to operate to provide pressure oil through the first hydraulic oil circuit.

[0038] The pressure oil enters the rodless chamber of the tensioning cylinder through the fourth hydraulic oil circuit. At the same time, the pressure oil triggers the hydraulic control end of the hydraulic control check valve through the fifth hydraulic oil circuit, so that the hydraulic control check valve releases the one-way cutoff. The pressure oil in the rod chamber of the tensioning cylinder returns to the hydraulic oil tank through the third hydraulic oil circuit and the second hydraulic oil circuit, maintaining the pressure oil of the third hydraulic oil circuit P z At the lower limit oil pressure value P min and upper limit oil pressure value P max During this time, the telescopic rod end of the tensioning oil cylinder extends relative to the cylinder end, and the telescopic rod end of the tensioning oil cylinder loosens the conveying belt through the tensioning transmission mechanism, the bucket wheel stacker reclaimer is lifted, the conveying belt lifts the tail car, and the conveying belt shortens in the horizontal direction until the tail car is lifted to the set position, and then enters mode 1 to complete the stacking switching tensioning when the bucket wheel stacker reclaimer is lifted and the conveying belt tail car is lifted;

[0039] Mode 3: Material switching tensioning

[0040] Enter mode 1 and maintain the third hydraulic oil circuit pressure oil pressure P z At the lower limit oil pressure value P min and upper limit oil pressure value P max During this time, the bucket wheel stacker reclaimer is lowered, the transport belt lowers the tail car, and the transport belt extends in the horizontal direction until the tail car is lowered to the set position, completing the material reclaiming switching tensioning when the bucket wheel stacker reclaimer is lowered and the transport belt tail car is lowered.

[0041] The beneficial technical effects of the present invention are:

[0042] According to the bucket wheel stacker reclaimer conveyor belt tensioning device and control method of the present invention, when the bucket wheel stacker reclaimer is in a stacking working mode or a reclaiming working mode, the conveyor belt is lifted or lowered along with the bucket wheel stacker reclaimer, and the conveyor belt is shortened or extended in the horizontal direction, and the tension of the conveyor belt can be automatically adjusted in real time without stopping the machine to prevent the belt from falling off; in addition, through the cooperation of a hydraulically controlled reversing valve, a safety valve, an overflow valve and a hydraulic oil circuit, etc., the conveyor belt can be prevented from slipping when starting. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a layout diagram of a conveying belt tensioning device of a bucket wheel stacker reclaimer according to an embodiment of the present invention;

[0044] Figure 2 It is a hydraulic principle diagram of a hydraulic station according to an embodiment of the present invention;

[0045] Figure 3 It is a schematic diagram of a bucket wheel stacker and reclaimer in a stacking working mode according to an embodiment of the present invention;

[0046] Figure 4 It is a schematic diagram of the bucket wheel stacker reclaimer in the reclaiming working mode according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. Certain embodiments of the present invention will be described more comprehensively with reference to the accompanying drawings, in which some but not all embodiments will be shown. In fact, the various embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the embodiments described herein; rather, these embodiments are provided so that the present invention meets applicable legal requirements.

[0048] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "front", "back" and the like indicate directions or positional relationships based on directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] In an embodiment of the present invention, a bucket wheel stacker reclaimer conveyor belt tensioning device and a bucket wheel stacker reclaimer conveyor belt tensioning control method are provided. Figures 1 to 4 shown.

[0050] A bucket wheel stacker reclaimer conveyor belt tensioning device comprises a tensioning oil cylinder 11, an oil cylinder seat 12, a tensioning transmission mechanism, a hydraulic station 2 and an electronic control unit 3.

[0051] The cylinder body end of the tensioning cylinder 11 is hinged to the cylinder seat 12 via a hinge, and the telescopic rod end of the tensioning cylinder 11 is connected to the transport belt 4 via a tensioning transmission mechanism.

[0052] Among them, the tensioning transmission mechanism includes a tensioning trolley 13, a pulley block 14, a tensioning rope 15 and a rope seat 16. The tensioning trolley 13 is connected to one end of the conveying belt 4, the pulley block 14 is set at the telescopic rod end of the tensioning cylinder 11, one end of the tensioning rope 15 is connected to the rope seat 16, and the other end of the tensioning rope 15 is connected to the tensioning trolley 13 via the pulley block 14.

[0053] The telescopic rod end of the tensioning oil cylinder 11 is telescopic relative to the cylinder end to pull the tensioning rope 15 through the pulley block 14, and then drive the tensioning trolley 13 to move through the tensioning rope 15. When the tensioning trolley 13 moves close to the conveying belt 4, the conveying belt 4 is relaxed, and when the tensioning trolley 13 moves away from the conveying belt 4, the conveying belt 4 is tightened.

[0054] The hydraulic station 2 includes a first hydraulic oil circuit 51, a second hydraulic oil circuit 52, a third hydraulic oil circuit 53, a fourth hydraulic oil circuit 54, a fifth hydraulic oil circuit 55, a sixth hydraulic oil circuit 56, a seventh hydraulic oil circuit 57, an eighth hydraulic oil circuit 58, a hydraulic oil tank 61, an electromagnetic reversing valve 621, a one-way valve 622, a safety valve 623, a hydraulically controlled one-way valve 624, a stop valve 625, a relief valve 626, a hydraulically controlled reversing valve 627, a throttle valve 628, a hydraulic pump 631, a drive motor 632, an accumulator 71 and a pressure sensor 72, etc.

[0055] One end of the first hydraulic oil circuit 51 is connected to the hydraulic oil tank 61, and the other end of the first hydraulic oil circuit 51 is connected to the V1 port of the electromagnetic reversing valve 621. The first hydraulic oil circuit 51 is connected to the hydraulic pump 631 and the one-way valve 622 in sequence from one end to the other end. The driving motor 632 is powered and connected to the driving end of the hydraulic pump 631. A pressure gauge 73 is connected to the first hydraulic oil circuit 51 at the rear end of the hydraulic pump 631.

[0056] The output shaft of the driving motor 632 rotates to drive the driving end of the hydraulic pump 631 to rotate, and the hydraulic pump 631 operates to provide pressure oil through the first hydraulic oil circuit 51. From one end of the first hydraulic oil circuit 51 to the other end of the first hydraulic oil circuit 51, the first hydraulic oil circuit 51 is unidirectionally guided by the one-way valve 622 to prevent the pressure oil from flowing back. The oil pressure of the pressure oil in the first hydraulic oil circuit 51 is detected in real time by the pressure gauge 73.

[0057] An oil suction filter 741 is connected to the first hydraulic oil circuit 51 at the front end of the hydraulic pump 631. A fine filter 742 is connected to the first hydraulic oil circuit 51 at the rear end of the hydraulic pump 631. The oil suction filter 741 is used to achieve preliminary filtration of the pressure oil entering the hydraulic pump 631 from the hydraulic oil tank 61, and the fine filter 742 is used to achieve secondary filtration of the pressure oil in the first hydraulic oil circuit 51.

[0058] An air filter 75 is connected to the air inlet end of the hydraulic oil tank 61 to filter the air entering the hydraulic oil tank 61 .

[0059] One end of the second hydraulic oil circuit 52 is connected to the V2 port of the electromagnetic reversing valve 621 , and the other end of the second hydraulic oil circuit 52 is connected to the hydraulic oil tank 61 .

[0060] The inlet of the safety valve 623 is connected to the first hydraulic oil circuit 51, and the outlet of the safety valve 623 is connected to the second hydraulic oil circuit 52. The threshold of the safety valve 623 is set, and the pressure is relieved through the safety valve 623 when the pressure oil in the first hydraulic oil circuit 51 is too high.

[0061] One end of the third hydraulic oil circuit 53 is connected to the C1 port of the electromagnetic reversing valve 621 , the other end of the third hydraulic oil circuit 53 is connected to the rod cavity end of the tensioning cylinder 11 , and the hydraulically controlled one-way valve 624 is connected to the third hydraulic oil circuit 53 .

[0062] The third hydraulic oil circuit 53 is unidirectionally connected by the hydraulic control check valve 624 from the C1 port of the electromagnetic reversing valve 621 to the rod chamber end of the tensioning oil cylinder 11. After the hydraulic control end of the hydraulic control check valve 624 is triggered, the hydraulic control check valve 624 bidirectionally connects the third hydraulic oil circuit 53.

[0063] One end of the fourth hydraulic oil circuit 54 is connected to the C2 port of the electromagnetic reversing valve 621 , the other end of the fourth hydraulic oil circuit 54 is connected to the rodless cavity end of the tensioning cylinder 11 , and the fourth hydraulic oil circuit 54 is connected to a throttle valve 628 .

[0064] When the electromagnetic reversing valve 621 is in the first state, port V1 is connected to port C1, and port V2 is connected to port C2; when the electromagnetic reversing valve 621 switches to the second state, port V1 is connected to port C2.

[0065] One end of the fifth hydraulic oil circuit 55 is connected to the fourth hydraulic oil circuit 54 , and the other end of the fifth hydraulic oil circuit 55 is connected to the hydraulically controlled end of the hydraulically controlled one-way valve 624 .

[0066] When the pressure oil is injected into the rod chamber of the tensioning cylinder 11 through the third hydraulic oil circuit 53, and the pressure oil in the rodless chamber of the tensioning cylinder 11 is returned through the fourth hydraulic oil circuit 54, the throttle valve 628 is used to control the flow of the return oil through the fourth hydraulic oil circuit 54 to adjust the retraction speed of the telescopic rod end of the tensioning cylinder 11 relative to the cylinder body end to avoid the retraction speed being too fast.

[0067] When injecting pressure oil into the rodless chamber of the tensioning oil cylinder 11 through the fourth hydraulic oil circuit 54, the throttle valve 628 is used to control the flow rate of the fourth hydraulic oil circuit 54 injecting oil into the rodless chamber of the tensioning oil cylinder 11, so as to adjust the extension speed of the telescopic rod end of the tensioning oil cylinder 11 relative to the cylinder body end, and avoid the retraction speed being too fast. On the other hand, back pressure is generated between the C2 port of the electromagnetic reversing valve 621 and the throttle valve 628, and the oil pressure of the pressure oil in the fourth hydraulic oil circuit 54 between the C2 port of the electromagnetic reversing valve 621 and the throttle valve 628 is increased, so that the pressure oil triggers the hydraulic control end of the hydraulic control check valve 624 through the fifth hydraulic oil circuit 55.

[0068] One end of the sixth hydraulic oil circuit 56 is connected to the third hydraulic oil circuit 53 between the hydraulically controlled one-way valve 624 and the tensioning cylinder 11, and the other end of the sixth hydraulic oil circuit 56 is connected to the hydraulic oil tank 61. The sixth hydraulic oil circuit 56 is connected to the accumulator 71 and the stop valve 625 in sequence, and the sixth hydraulic oil circuit 56 is connected to the pressure sensor 72.

[0069] After the pressure oil enters the third hydraulic oil circuit 53, part of the pressure oil is stored in the accumulator 71 through the sixth hydraulic oil circuit 56, so as to supplement the system oil pressure loss through the pressure oil stored in the accumulator 71, avoid frequent starting and stopping of the drive motor 632, and reduce the operating power consumption of the drive motor 632.

[0070] The pressure sensor 72 is used to detect the oil pressure of the sixth hydraulic oil circuit 56 and the third hydraulic oil circuit 53 in real time. When the oil pressure detected by the pressure sensor 72 rises to the upper limit oil pressure value P set by the electronic control unit 3, max When the oil pressure detected by the pressure sensor 72 drops to the lower limit oil pressure value P set by the electronic control unit 3, the electronic control unit 3 triggers the drive motor 632 to stop; min When the electric control unit 3 triggers the driving motor 632 to start.

[0071] During maintenance, the stop valve 625 is opened to relieve the pressure of the accumulator 71 .

[0072] One end of the seventh hydraulic oil circuit 57 is connected to the sixth hydraulic oil circuit 56, and the other end of the seventh hydraulic oil circuit 57 is connected to the hydraulic oil tank 61. The seventh hydraulic oil circuit 57 is connected to the overflow valve 626. When the pressure of the oil in the sixth hydraulic oil circuit 56 is too high and exceeds the threshold of the overflow valve 626, the pressure is released through the overflow valve 626 and the seventh hydraulic oil circuit 57 and enters the hydraulic oil tank 61.

[0073] The electronic control unit 3 is configured as a PLC controller, and the electronic control unit 3 is connected to the control end of the drive motor 632, the control end of the electromagnetic reversing valve 621 and the pressure sensor 72 via signal cables, so as to control the operation of the drive motor 63 and the electromagnetic reversing valve 621 through the electronic control unit 3, and the pressure sensor 72 uploads the real-time detected oil pressure value to the electronic control unit 3.

[0074] The hydraulically controlled reversing valve 627 is arranged in the seventh hydraulic oil circuit 57 between the overflow valve 626 and the hydraulic oil tank 61. One end of the eighth hydraulic oil circuit 58 is connected to the first hydraulic oil circuit 51 at the rear end of the hydraulic pump 631, and the other end of the eighth hydraulic oil circuit 58 is connected to the hydraulic control end of the hydraulically controlled reversing valve 627.

[0075] The hydraulic pump 631 supplies pressure oil to the first hydraulic oil circuit 51, and then supplies pressure oil to the eighth hydraulic oil circuit 58, triggering the hydraulic control end of the hydraulic control reversing valve 627, and the hydraulic control reversing valve 627 cuts off the seventh hydraulic oil circuit 57 between the relief valve 626 and the hydraulic oil tank 61. When pressure oil is not supplied to the eighth hydraulic oil circuit 58, the hydraulic control end of the hydraulic control reversing valve 627 is not triggered, and the hydraulic control reversing valve 627 conducts the seventh hydraulic oil circuit 57 between the relief valve 626 and the hydraulic oil tank 61.

[0076] The threshold value of the pressure relief of the safety valve 623 is set to be greater than the threshold value of the pressure relief valve 626. When the hydraulic pump 631 is started, the oil pressure of the system is set by the safety valve 623 to increase the oil pressure of the system when the hydraulic pump 631 is started. After the hydraulic pump 631 stops, the oil pressure of the system is set by the relief valve 626. The tension of the conveyor belt 4 when it is started must be greater than the tension during normal operation. If the tension of the conveyor belt 4 when it is started is less than or equal to the tension during normal operation, the conveyor belt 4 will slip when it is started. When the hydraulic pump 631 is started, the oil pressure of the system is the oil pressure corresponding to the tension of the conveyor belt 4 when it is started. When the conveyor belt 4 is started, the hydraulic pump 631 (drive motor 632) is started synchronously to prevent the conveyor belt 4 from slipping when it is started.

[0077] A bucket wheel stacker reclaimer transport belt tensioning control method, using the bucket wheel stacker reclaimer transport belt tensioning device;

[0078] The method can selectively enter the following three modes:

[0079] Mode 1: Normal operation, tensioning and pressure maintenance

[0080] The electronic control unit 3 triggers the electromagnetic reversing valve 621 to switch to the first state position. When the electromagnetic reversing valve 621 is in the first state position, the V1 port is connected to the C1 port, and the V2 port is connected to the C2 port. The electronic control unit 3 triggers the drive motor 632 to start, and the drive motor 632 drives the hydraulic pump 631 to operate to provide pressure oil through the first hydraulic oil circuit 51.

[0081] The threshold value of the pressure relief of the safety valve 623 is set to be greater than the threshold value of the pressure relief of the overflow valve 626, and pressure oil is provided to the first hydraulic oil circuit 51, and then to the eighth hydraulic oil circuit 58, triggering the hydraulic control end of the hydraulic control reversing valve 627, and the hydraulic control reversing valve 627 cuts off the seventh hydraulic oil circuit 57 between the overflow valve 626 and the hydraulic oil tank 61. The oil pressure of the system is set by the safety valve 623. When the hydraulic pump 631 is started, the oil pressure of the system (the third hydraulic oil circuit 53, the sixth hydraulic oil circuit 56 and the rod chamber of the tensioning cylinder 11) is the oil pressure corresponding to the tensioning force when the conveying belt 4 is started. When the conveying belt 4 is started, the hydraulic pump 631 (drive motor 632) is started synchronously to prevent the conveying belt 4 from slipping when starting;

[0082] The pressure oil enters the rod chamber of the tensioning cylinder 11 through the third hydraulic oil circuit 53, and the pressure oil in the rodless chamber of the tensioning cylinder 11 returns to the hydraulic oil tank 61 through the fourth hydraulic oil circuit 54 and the second hydraulic oil circuit 52. The telescopic rod end of the tensioning cylinder 11 contracts relative to the cylinder body end, and the telescopic rod end of the tensioning cylinder 11 tensions the conveying belt 4 through the tensioning transmission mechanism.

[0083] Part of the pressure oil is stored in the accumulator 71 through the sixth hydraulic oil circuit 56;

[0084] The pressure sensor 72 detects the oil pressure of the sixth hydraulic oil circuit 56 in real time. When the oil pressure detected by the pressure sensor 72 rises to the upper limit oil pressure value P set by the electronic control unit 3, max When , the electronic control unit 3 triggers the drive motor 632 to stop;

[0085] After the driving motor 632 stops, the eighth hydraulic oil circuit 58 is not supplied with pressurized oil, the hydraulic control end of the hydraulic control reversing valve 627 is not triggered, the hydraulic control reversing valve 627 conducts the seventh hydraulic oil circuit 57 between the relief valve 626 and the hydraulic oil tank 61, and the oil pressure of the system is set by the relief valve 626;

[0086] Part of the pressure oil stored in the accumulator 71 supplements the system oil pressure loss, and the third hydraulic oil circuit 53 is cut off by the hydraulically controlled one-way valve 624 to maintain the current posture of the telescopic rod end of the tensioning cylinder 11 being retracted relative to the cylinder end;

[0087] When the oil pressure detected by the pressure sensor 72 drops to the lower limit oil pressure value P set by the electronic control unit 3 min When the electric control unit 3 triggers the drive motor 632 to start, the oil pressure detected by the pressure sensor 72 rises to the upper limit oil pressure value P set by the electric control unit 3. max ;

[0088] Among them, the pressure oil pressure P of the third hydraulic oil circuit 53 z At the lower limit oil pressure value P min and upper limit oil pressure value P max between.

[0089] Mode 2: Stacking switch tensioning

[0090] The electronic control unit 3 triggers the electromagnetic reversing valve 621 to switch to the second state position. When the electromagnetic reversing valve 621 is in the second state position, the V1 port is connected to the C2 port, and the V2 port is connected to the C1 port. The electronic control unit 3 triggers the drive motor 632 to start, and the drive motor 632 drives the hydraulic pump 631 to operate to provide pressure oil through the first hydraulic oil circuit 51.

[0091] The pressure oil enters the rodless chamber of the tensioning cylinder 11 through the fourth hydraulic oil circuit 54. At the same time, the pressure oil triggers the hydraulic control end of the hydraulic control check valve 624 through the fifth hydraulic oil circuit 55, so that the hydraulic control check valve 624 releases the one-way cutoff. The pressure oil in the rod chamber of the tensioning cylinder 11 returns to the hydraulic oil tank 61 through the third hydraulic oil circuit 53 and the second hydraulic oil circuit 52, maintaining the pressure oil of the third hydraulic oil circuit 53 at the oil pressure P z At the lower limit oil pressure value P min and upper limit oil pressure value P max The telescopic rod end of the tensioning cylinder 11 extends relative to the cylinder body end, and the telescopic rod end of the tensioning cylinder 11 relaxes the conveying belt 4 through the tensioning transmission mechanism, the bucket wheel stacker reclaimer is lifted, the rear belt 8 of the bucket wheel stacker reclaimer is lifted, the conveying belt 4 lifts the tail car, and the conveying belt 4 is shortened in the horizontal direction until the tail car is lifted to the set position, and then enters mode 1 to complete the stacking switching tensioning when the bucket wheel stacker reclaimer is lifted and the conveying belt 4 tail car is lifted.

[0092] Mode 3: Material switching tensioning

[0093] Entering mode 1, maintaining the pressure oil pressure P of the third hydraulic oil circuit 53 z At the lower limit oil pressure value P min and upper limit oil pressure value P max During this time, the bucket wheel stacker reclaimer is lowered, the rear belt 8 of the bucket wheel stacker reclaimer is lowered, the transport belt 4 lowers the tail car, and the transport belt 4 extends in the horizontal direction until the tail car is lowered to the set position, completing the material reclaiming switching tensioning when the bucket wheel stacker reclaimer is lowered and the transport belt tail car is lowered.

[0094] So far, the present embodiment has been described in detail in conjunction with the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the bucket wheel stacker conveyor belt tensioning device of the present invention. In the bucket wheel stacker conveyor belt tensioning device and control method of the present invention, when the bucket wheel stacker is in the stacking working mode or the retrieving working mode, the conveyor belt is lifted or lowered along with the bucket wheel stacker, and the conveyor belt is shortened or extended in the horizontal direction. The tension of the conveyor belt can be automatically adjusted in real time without stopping the machine to prevent the belt from falling off. In addition, through the cooperation of the hydraulically controlled reversing valve 627, the safety valve 623, the overflow valve 626 and the hydraulic oil circuit, the conveyor belt 4 can be prevented from slipping when starting.

[0095] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bucket wheel stacker reclaimer conveyor belt tensioning device, characterized in that: It includes a tensioning oil cylinder, an oil cylinder seat, a tensioning transmission mechanism, a hydraulic station and an electronic control unit; The cylinder body end of the tensioning oil cylinder is arranged on the oil cylinder seat, and the telescopic rod end of the tensioning oil cylinder is connected to the transport belt via the tensioning transmission mechanism; The hydraulic station includes a first hydraulic oil circuit, a second hydraulic oil circuit, a third hydraulic oil circuit, a fourth hydraulic oil circuit, a fifth hydraulic oil circuit, a sixth hydraulic oil circuit, a seventh hydraulic oil circuit, a hydraulic oil tank, an electromagnetic reversing valve, a hydraulic pump, a drive motor, a check valve, a safety valve, a hydraulically controlled check valve, an accumulator, a stop valve, a pressure sensor and a relief valve; One end of the first hydraulic oil circuit is connected to the hydraulic oil tank, the other end of the first hydraulic oil circuit is connected to the V1 port of the electromagnetic reversing valve, the first hydraulic oil circuit is connected to the hydraulic pump and the one-way valve in sequence from one end to the other end, and the driving motor is connected to the driving end of the hydraulic pump; One end of the second hydraulic oil circuit is connected to the V2 port of the electromagnetic reversing valve, and the other end of the second hydraulic oil circuit is connected to the hydraulic oil tank; The liquid inlet end of the safety valve is connected to the first hydraulic oil circuit, and the liquid outlet end of the safety valve is connected to the second hydraulic oil circuit; One end of the third hydraulic oil circuit is connected to the C1 port of the electromagnetic reversing valve, the other end of the third hydraulic oil circuit is connected to the rod chamber end of the tensioning oil cylinder, and the hydraulically controlled one-way valve is connected to the third hydraulic oil circuit; One end of the fourth hydraulic oil circuit is connected to the C2 port of the electromagnetic reversing valve, and the other end of the fourth hydraulic oil circuit is connected to the rodless chamber end of the tensioning cylinder; One end of the fifth hydraulic oil circuit is connected to the fourth hydraulic oil circuit, and the other end of the fifth hydraulic oil circuit is connected to the hydraulic control end of the hydraulic control one-way valve; One end of the sixth hydraulic oil circuit is connected to the third hydraulic oil circuit between the hydraulically controlled one-way valve and the tensioning oil cylinder, the other end of the sixth hydraulic oil circuit is connected to the hydraulic oil tank, the sixth hydraulic oil circuit is connected to an accumulator and a stop valve in sequence, and the sixth hydraulic oil circuit is connected to a pressure sensor; One end of the seventh hydraulic oil circuit is connected to the sixth hydraulic oil circuit, the other end of the seventh hydraulic oil circuit is connected to the hydraulic oil tank, and the seventh hydraulic oil circuit is connected to a relief valve; The electronic control unit is connected to the control end of the drive motor, the control end of the electromagnetic reversing valve and the pressure sensor via signal cables respectively.

2. The bucket wheel stacker reclaimer conveyor belt tensioning device according to claim 1, characterized in that: It also includes a hydraulically controlled reversing valve and an eighth hydraulic oil circuit. The hydraulically controlled reversing valve is arranged in the seventh hydraulic oil circuit between the overflow valve and the hydraulic oil tank. One end of the eighth hydraulic oil circuit is connected to the first hydraulic oil circuit at the rear end of the hydraulic pump, and the other end of the eighth hydraulic oil circuit is connected to the hydraulic control end of the hydraulically controlled reversing valve.

3. The bucket wheel stacker reclaimer conveyor belt tensioning device according to claim 1, characterized in that: The tensioning transmission mechanism includes a tensioning trolley, a pulley block, a tensioning rope and a rope seat; the tensioning trolley is connected to one end of the conveying belt, the pulley block is arranged at the telescopic rod end of the tensioning cylinder, one end of the tensioning rope is connected to the rope seat, and the other end of the tensioning rope is connected to the tensioning trolley via the pulley block.

4. The bucket wheel stacker reclaimer conveyor belt tensioning device according to claim 1, characterized in that: The fourth hydraulic oil circuit is connected with a throttle valve.

5. The bucket wheel stacker reclaimer conveyor belt tensioning device according to claim 1, characterized in that: A pressure gauge is connected to the first hydraulic oil circuit at the rear end of the hydraulic pump.

6. The bucket wheel stacker reclaimer conveyor belt tensioning device according to claim 1, characterized in that: An oil suction filter is connected to the first hydraulic oil circuit at the front end of the hydraulic pump.

7. The bucket wheel stacker reclaimer conveyor belt tensioning device according to claim 1, characterized in that: A fine filter is connected to the first hydraulic oil circuit at the rear end of the hydraulic pump.

8. The bucket wheel stacker reclaimer conveyor belt tensioning device according to claim 1, characterized in that: The air inlet end of the hydraulic oil tank is connected with an air filter.

9. The bucket wheel stacker reclaimer conveyor belt tensioning device according to claim 1, characterized in that: The electronic control unit is configured as a PLC controller.

10. A method for controlling the tension of a conveying belt of a bucket wheel stacker and reclaimer, characterized in that: A bucket wheel stacker reclaimer transport belt tensioning device according to any one of claims 1 to 9; The method can selectively enter the following three modes: Mode 1: Normal operation, tensioning and pressure maintenance The electronic control unit triggers the electromagnetic reversing valve to switch to the first state position. When the electromagnetic reversing valve is in the first state position, the V1 port is connected to the C1 port, and the V2 port is connected to the C2 port. The electronic control unit triggers the drive motor to start, and the drive motor drives the hydraulic pump to operate to provide pressure oil through the first hydraulic oil circuit. The pressure oil enters the rod chamber of the tensioning oil cylinder through the third hydraulic oil circuit, and the pressure oil in the rodless chamber of the tensioning oil cylinder returns to the hydraulic oil tank through the fourth hydraulic oil circuit and the second hydraulic oil circuit. The telescopic rod end of the tensioning oil cylinder contracts relative to the cylinder body end, and the telescopic rod end of the tensioning oil cylinder tensions the conveying belt through the tensioning transmission mechanism; Part of the pressure oil is stored in the accumulator through the sixth hydraulic oil circuit; The pressure sensor detects the oil pressure of the sixth hydraulic oil circuit in real time. When the oil pressure detected by the pressure sensor rises to the upper limit oil pressure value P set by the electronic control unit, max When the ECU triggers the drive motor to stop; Part of the pressure oil stored in the accumulator supplements the system oil pressure loss, and the hydraulically controlled one-way valve cuts off the third hydraulic oil circuit to maintain the current posture of the telescopic rod end of the tensioning cylinder contracted relative to the cylinder end; When the oil pressure detected by the pressure sensor drops to the lower limit oil pressure value P set by the electronic control unit min When the oil pressure detected by the pressure sensor reaches the upper limit oil pressure value P set by the electronic control unit, the electronic control unit triggers the drive motor to start. max ; Among them, the third hydraulic oil circuit pressure oil pressure P z At the lower limit oil pressure value P min and upper limit oil pressure value P max between; Mode 2: Stacking switch tensioning The electronic control unit triggers the electromagnetic reversing valve to switch to the second state position. When the electromagnetic reversing valve is in the second state position, the V1 port is connected to the C2 port, and the V2 port is connected to the C1 port. The electronic control unit triggers the drive motor to start, and the drive motor drives the hydraulic pump to operate to provide pressure oil through the first hydraulic oil circuit. The pressure oil enters the rodless chamber of the tensioning cylinder through the fourth hydraulic oil circuit. At the same time, the pressure oil triggers the hydraulic control end of the hydraulic control check valve through the fifth hydraulic oil circuit, so that the hydraulic control check valve releases the one-way cutoff. The pressure oil in the rod chamber of the tensioning cylinder returns to the hydraulic oil tank through the third hydraulic oil circuit and the second hydraulic oil circuit, maintaining the pressure oil of the third hydraulic oil circuit P z At the lower limit oil pressure value P min and upper limit oil pressure value P max During this time, the telescopic rod end of the tensioning oil cylinder extends relative to the cylinder end, and the telescopic rod end of the tensioning oil cylinder loosens the conveying belt through the tensioning transmission mechanism, the bucket wheel stacker reclaimer is lifted, the conveying belt lifts the tail car, and the conveying belt shortens in the horizontal direction until the tail car is lifted to the set position, and then enters mode 1 to complete the stacking switching tensioning when the bucket wheel stacker reclaimer is lifted and the conveying belt tail car is lifted; Mode 3: Material switching tensioning Enter mode 1 and maintain the third hydraulic oil circuit pressure oil pressure P z At the lower limit oil pressure value P min and upper limit oil pressure value P max During this time, the bucket wheel stacker reclaimer is lowered, the transport belt lowers the tail car, and the transport belt extends in the horizontal direction until the tail car is lowered to the set position, completing the material reclaiming switching tensioning when the bucket wheel stacker reclaimer is lowered and the transport belt tail car is lowered.

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