Automatic tensioning system of belt conveyor

Abstract

The utility model provides an automatic tensioning system of a belt conveyor. The automatic tensioning system of the belt conveyor comprises a control host, at least one conveying belt driving motor, a mutual inductor, a tension sensor, a travel switch, an oil pump unit and a tensioning unit. The conveying belt driving motor is used for driving the conveying belt to operate, and the conveying belt driving motor performs signal transmission with the control host through the mutual inductor; the tension sensor is used for sending a tension value signal of the conveying belt to the control host; the oil pump unit is used for providing oil pressure for the tensioning unit. The tensioning unit is used for tensioning and loosening the conveying belt; the travel switch is installed on the motion path of the conveyor belt head, and the control host is connected with the travel switch and used for obtaining in-place information of the conveyor belt head. The automatic tensioning system of the belt conveyor has the advantages of being capable of achieving tensioning of the conveying belt through automatic control and adjustable in tensioning force.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine mechanical equipment, in particular to an automatic tensioning system of a belt conveyor. Background Art

[0002] In the production process of large-scale coal mines, long-distance conveyor belts are responsible for transporting coal underground. With the continuous improvement of underground coal mine transportation capacity and the continuous extension of roadways, the conveyor belt length of conveyor belts is gradually increasing. In order to improve the flame retardant reliability of underground conveyor belts, the use of flame retardant solid core tape is also expanding. However, the extension of conveyor belt length and the use of flame retardant solid core tape have brought a new problem: the rapid increase in conveyor belt elongation.

[0003] Specifically, the elongation of the steel wire rope core tape that was previously widely used was 0.1%, while the elongation of the flame-retardant whole-core tape was 1%, which was ten times higher. This brought limitations to the conventional conveyor belt tensioning devices such as heavy hammer tensioning and return column winch tensioning. As a result, these tensioning devices are limited by their tensioning distance and tensioning force, making it difficult to adapt to the tensioning requirements of conveyor belts, especially those over 500 meters.

[0004] At present, most conveyor belts in mines are equipped with tensioning devices. The head of the conveyor belt is designed to be a horizontally movable structure. The horizontal movement of the head is achieved by manually controlling the motor or hydraulic motor to achieve the tensioning or relaxation of the entire conveyor belt. Due to the changes in the properties of the aforementioned conveyor belts, there is a great demand to change manual control to automatic control.

[0005] In summary, the conveyor belt tensioning of long-distance conveyors must not only meet the requirements of conveyor belt elongation, but also meet the requirements of automatic adjustment of tensioning force. In order to solve the above problems, people have been seeking an ideal technical solution. Utility Model Content

[0006] The purpose of the utility model is to address the deficiencies of the prior art and thus provide an automatic tensioning system for a belt conveyor which can automatically control and achieve conveyor belt tensioning and has adjustable tensioning force.

[0007] In order to achieve the above-mentioned object, the technical solution adopted by the present utility model is: an automatic tensioning system for a belt conveyor, comprising a control host, at least one conveyor belt drive motor, a mutual inductor, a tension sensor, a travel switch, an oil pump unit and a tensioning unit;

[0008] The conveyor belt drive motor is used to drive the conveyor belt to operate. The conveyor belt drive motor transmits signals to the control host through a mutual inductor, so as to enable the control host to obtain the start and stop signals of the conveyor belt drive motor;

[0009] The tension sensor is installed at the head of the conveyor belt and is connected to the control host to send a tension value signal of the conveyor belt to the control host;

[0010] The oil pump unit is connected to the control host and is used to provide oil pressure to the tensioning unit;

[0011] The tensioning unit acts on the head of the conveyor belt, and realizes the tensioning and loosening of the conveyor belt by pulling and loosening the head of the conveyor belt. The control host controls the pulling and loosening action of the tensioning unit;

[0012] The travel switch is installed on the motion path of the conveyor belt head, and the control host is connected to the travel switch to obtain the position information of the conveyor belt head.

[0013] Based on the above, the travel switch is installed in an area outside the effective tensioning stroke of the conveyor belt head, as one of the signal bases for judging whether the conveyor belt is broken.

[0014] Based on the above, the tensioning unit includes a hydraulic motor, a tensioning solenoid valve, a release solenoid valve and a signal converter;

[0015] The control host controls the opening and closing of the tensioning solenoid valve, the releasing solenoid valve and the cylinder solenoid valve respectively through the signal converter;

[0016] The tensioning solenoid valve and the releasing solenoid valve are used to connect the oil pump unit and the hydraulic motor, and drive the tensioning and relaxing of the conveyor belt head by controlling the forward and reverse rotation of the hydraulic motor.

[0017] Based on the above, the tensioning unit also includes a cylinder solenoid valve and a tensioning cylinder. The cylinder solenoid valve is used to connect the oil pump unit and the tensioning cylinder. The tensioning cylinder is connected between the hydraulic motor and the head of the conveyor belt to absorb tension fluctuations.

[0018] Based on the above, the tensioning unit includes a winch motor unit, a forward and reverse electromagnetic starter, a brake motor and a brake motor starter. The control host controls the winch motor unit to rotate forward or reverse through the forward and reverse electromagnetic starter. The winch motor unit realizes the tensioning and relaxation of the conveyor belt head through the traction rope.

[0019] The control host controls the opening and closing of the brake motor through the brake motor starter, and the brake motor is used to drive the power component of the brake brake to brake the conveyor belt.

[0020] Based on the above, during the startup period, the control host controls the tensioning unit to tension the conveyor belt head so that the tension of the conveyor belt is ≥ 150% of the tension during normal operation.

[0021] Based on the above, during the normal operation period, the control host controls the tensioning unit to relax the conveyor belt head so that the tension of the conveyor belt is 100% of the tension during normal operation.

[0022] Based on the above, during the shutdown phase, the control host controls the tensioning unit to relax the conveyor belt head so that the tension of the conveyor belt is ≤ 90% of the tension during normal operation.

[0023] Compared with the existing technology, the utility model has substantial characteristics and progress. Specifically, on the basis of the traditional manual tensioning system of the conveyor belt, the utility model adds a control host, a tension sensor, a mutual inductor, a travel switch and a drive improvement of the tensioning unit, so that the tensioning state of the conveyor belt can be sensed, and through the cooperation between various electronic components, the tensioning force of the conveyor belt can be adjusted and controlled, and has the ability to protect against belt breakage, thereby replacing the traditional manual tensioning adjustment status quo and avoiding the safety risks brought about by unexpected situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a principle diagram of the automatic tensioning system of the belt conveyor in the utility model.

[0025] Figure 2 This is a control logic diagram of the automatic tensioning system of the belt conveyor in Example 1 of the present utility model.

[0026] Figure 3 This is a control logic diagram of the automatic tensioning system of the belt conveyor in Example 2 of the present utility model.

[0027] In the figure: 1. Control host; 2. Conveyor belt drive motor; 3. Mutual inductor; 4. Tension sensor; 5. Travel switch; 6. Oil pump unit; 7. Tensioning unit; 8. Isolation fence; 71. Hydraulic motor; 72. Tensioning solenoid valve; 73. Release solenoid valve; 74. Signal converter; 75. Cylinder solenoid valve; 76. Tensioning cylinder; 81. Winch motor unit; 82. Forward and reverse electromagnetic starter; 83. Brake motor; 84. Brake motor starter. DETAILED DESCRIPTION

[0028] The technical solution of the present utility model is further described in detail below through specific implementation methods.

[0029] Example 1

[0030] like Figure 1 and Figure 2 As shown, an automatic tensioning system for a belt conveyor includes a control host 1, at least one conveyor belt drive motor 2, a mutual inductor 3, a tension sensor 4, a travel switch 5, an oil pump unit 6 and a tensioning unit 7.

[0031] The belt conveyor mainly includes a conveyor belt 11, a conveyor belt drive motor (integrated in the machine head) and a conveyor belt machine head 12. The conveyor belt 11 is installed based on two sets of conveyor belt machines 12 at both ends and runs in a U-shaped pattern. The conveyor belt machine head 12 at one end can move horizontally to make the two conveyor belt machines move closer or farther away, thereby achieving the tensioning and relaxation of the conveyor belt. The conveyor belt drive motor and the conveyor belt machine head are integrated with the foundation and can usually be installed at one end in a fixed position to drive the conveyor belt 11 to rotate. This mechanism is the basic structure for the belt conveyor to adjust the tensioning force, which is the existing technology.

[0032] The conveyor belt drive motor 2 is used to drive the conveyor belt to operate. The conveyor belt drive motor 2 transmits signals to the control host 1 through the mutual inductor 3. In this embodiment, an isolation fence 8 is added for safety protection, which is used to enable the control host 1 to obtain the start and stop signals of the conveyor belt drive motor 2. Generally, one control host 1 can control the tension adjustment of multiple conveyor belts.

[0033] The tension sensor 4 is installed at the head of the conveyor belt. The tension sensor 4 is connected to the control host 1 and is used to send a tension value signal of the conveyor belt to the control host 1.

[0034] The oil pump unit 6 is connected to the control host 1 and is used to provide oil pressure for the tensioning unit.

[0035] The tensioning unit 7 acts on the head of the conveyor belt, and realizes the tensioning and loosening of the conveyor belt by pulling and loosening the head of the conveyor belt. The control host 1 controls the pulling and loosening actions of the tensioning unit 7.

[0036] In this embodiment, the tensioning unit 7 includes a hydraulic motor 71 , a tensioning solenoid valve 72 , a release solenoid valve 73 and a signal converter 74 .

[0037] The control host 1 controls the opening and closing of the tensioning solenoid valve 72 , the releasing solenoid valve 73 and the cylinder solenoid valve 74 respectively through the signal converter 74 .

[0038] Specifically, the tensioning solenoid valve 72 and the release solenoid valve 73 are used to connect the oil pump unit 6 and the hydraulic motor 71, and drive the tensioning and relaxation of the conveyor belt head by controlling the forward and reverse rotation of the hydraulic motor 71. When the tensioning solenoid valve 72 is turned on, the conveyor belt head moves outward to tension the conveyor belt. When the release solenoid valve 73 is turned on, the conveyor belt mechanism retreats inward to relax the conveyor belt.

[0039] In the preferred embodiment, the tensioning unit also includes a cylinder solenoid valve 75 and a tensioning cylinder 76. The cylinder solenoid valve 75 is used to connect the oil pump unit 6 and the tensioning cylinder 76. The tensioning cylinder 76 is connected between the hydraulic motor and the head of the conveyor belt to absorb tension fluctuations.

[0040] The travel switch 5 is installed on the movement path of the conveyor belt head. The control host 1 is connected to the travel switch 5 to obtain the position information of the conveyor belt head. The main function of the travel switch is to sense whether the conveyor belt is broken. Therefore, the travel switch 5 is installed in the area outside the effective tensioning stroke of the conveyor belt head as one of the signal bases for judging whether the conveyor belt is broken.

[0041] Take the load of three conveyor belt drive motors as an example:

[0042] 1. Startup Phase: The conveyor belt drive motors start in the following order: Conveyor belt drive motor #1 starts, then conveyor belt drive motor #2 starts five seconds later, then conveyor belt drive motor #3 starts five seconds later. The control host detects the start signal from conveyor belt drive motor #1 through a transformer and activates the oil pump unit. The oil pressure quickly reaches 12 MPa (the tensioning cylinder also maintains 12 MPa). The control host then controls the hydraulic motor to rotate forward, driving the winch to tighten the conveyor belt head. The conveyor belt stops when the tension reaches 1.5 times its normal tension. This 1.5 times tension is to prevent the conveyor belt from slipping during startup.

[0043] 2. Operation Phase: After the conveyor belt runs normally at a speed of 3m / s-5m / s (i.e., a 20-second delay after the start of the #1 conveyor belt drive motor), the control host controls the relaxation solenoid valve, reducing the tension from 1.5 times the initial tension of the conveyor belt to 1 times the tension value. If the control host detects that the tension is less than 0.95 times the normal tension, the tension solenoid valve opens, increasing the tension to 1 times the tension value. If the control host detects that the tension is greater than 1.05 times the normal tension, the relaxation solenoid valve opens, reducing the tension to 1 times the tension value.

[0044] 3. Belt break protection: When the conveyor belt breaks, the tensioning trolley quickly moves to the right, and the wire rope tension also decreases rapidly. When the tensioning trolley passes the travel switch, the travel switch outputs the active switch quantity to the control host. When the control host detects the belt break, it opens the relaxation solenoid valve to prevent the tensioning trolley from continuing to move to the right until the tension sensor tension is close to 0.

[0045] 4. Shutdown Phase: The conveyor belt motors stop in the following order: Conveyor 1# drive motor stops, then 2 seconds later, Conveyor 2# drive motor stops, then 2 seconds later, Conveyor 3# drive motor stops. The control host detects the shutdown signal from Conveyor 1# drive motor via a transformer. After a 20-second delay, the control host controls the release solenoid valve. The conveyor belt stops when the tension reaches 0.9 times its normal force. The control host then shuts down the oil pump motor.

[0046] This solution controls the tension and relaxation of the conveyor belt through real-time tension acquisition. Compared with traditional manual operations, it is more efficient and has a travel switch for belt break protection. Different tension control schemes can be adopted according to the different stages of the conveyor belt operation. The startup stage can effectively prevent the belt from slipping, and the normal uniform speed operation stage can ensure that the belt tension is within the normal range, and the belt will not slip or be too tight. Real-time data can be connected to the centralized control host through the substation CAN port using CAN to Ethernet to remotely view the equipment operation status.

[0047] Example 2

[0048] like Figure 3 As shown, the main difference between this embodiment and embodiment 1 is that the tensioning unit includes a winch motor unit 81, a forward and reverse electromagnetic starter 82, a brake motor 83 and a brake motor starter 84. The control host 1 controls the winch motor unit 81 to rotate forward or reverse through the forward and reverse electromagnetic starter 82. The winch motor unit 81 realizes the tensioning and relaxation of the conveyor belt head through the traction rope.

[0049] The control host 1 controls the opening and closing of the brake motor 83 through the brake motor starter 84. The brake motor 83 is used to drive the power component of the brake brake to brake the conveyor belt.

[0050] The working process is as follows:

[0051] 1. Startup phase: The control host detects the start signal from the 1# conveyor belt drive motor through the mutual inductor. The control host starts the 1# brake motor and the 2# brake motor on the tensioning device. The brake is released. After 1 second, the control host controls the winch motor to rotate forward. The belt stops when the tension reaches 1.5 times the normal tension. The 1.5 times tension is to prevent the belt from slipping during startup.

[0052] 2. Operation Phase: After the belt runs normally at a speed of 3m / s-5m / s (i.e., a 20-second delay after the start of the #1 conveyor belt drive motor), the control host controls the winch motor to rotate in the reverse direction, reducing the tension from 1.5 times the belt tension at startup to 1 times the tension value. If the control host detects that the tension is less than 0.95 times the normal tension, it controls the winch motor to rotate forward, increasing the tension to 1 times the tension value. If the control host detects that the tension is greater than 1.05 times the normal tension, it controls the winch motor to rotate in the reverse direction, reducing the tension to 1 times the tension value.

[0053] 3. Belt break protection: When the belt breaks, the tensioning trolley quickly moves to the right, and the wire rope tension also decreases rapidly. When the tensioning trolley passes the travel switch, the travel switch outputs the active switch quantity to the control host, and the control host starts the 1# brake motor and the 2# brake motor. The brake is released, and after 1 second, the winch motor is controlled to reverse, preventing the tensioning trolley from continuing to move to the right, until the tension sensor tension is close to 0.

[0054] 4. Shutdown phase: The control host detects the shutdown signal of the 1# conveyor belt drive motor through the mutual inductor. After a delay of 20 seconds, the control host controls the winch motor to reverse. The belt stops when the tension reaches 0.9 times the normal tension. The control host turns off the 1# brake motor and the 2# brake motor, entering the brake state.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the utility model, they should all be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. An automatic tensioning system for a belt conveyor, characterized in that: It includes a control host, at least one conveyor belt drive motor, a mutual inductor, a tension sensor, a travel switch, an oil pump unit and a tensioning unit; The conveyor belt drive motor is used to drive the conveyor belt to operate. The conveyor belt drive motor transmits signals to the control host through a mutual inductor, so as to enable the control host to obtain the start and stop signals of the conveyor belt drive motor; The tension sensor is installed at the head of the conveyor belt and is connected to the control host to send a tension value signal of the conveyor belt to the control host; The oil pump unit is connected to the control host and is used to provide oil pressure to the tensioning unit; The tensioning unit acts on the head of the conveyor belt, and realizes the tensioning and loosening of the conveyor belt by pulling and loosening the head of the conveyor belt. The control host controls the pulling and loosening action of the tensioning unit; The travel switch is installed on the motion path of the conveyor belt head, and the control host is connected to the travel switch to obtain the position information of the conveyor belt head.

2. The automatic tensioning system for a belt conveyor according to claim 1, characterized in that: The travel switch is installed in an area outside the effective tensioning stroke of the conveyor belt head and serves as one of the signal bases for judging whether the conveyor belt is broken.

3. The automatic tensioning system for a belt conveyor according to claim 2, characterized in that: The tensioning unit includes a hydraulic motor, a tensioning solenoid valve, a release solenoid valve and a signal converter; The control host controls the opening and closing of the tensioning solenoid valve, the releasing solenoid valve and the cylinder solenoid valve respectively through the signal converter; The tensioning solenoid valve and the releasing solenoid valve are used to connect the oil pump unit and the hydraulic motor, and drive the tensioning and relaxing of the conveyor belt head by controlling the forward and reverse rotation of the hydraulic motor.

4. The automatic tensioning system for a belt conveyor according to claim 3, characterized in that: The tensioning unit also includes a cylinder solenoid valve and a tensioning cylinder. The cylinder solenoid valve is used to connect the oil pump unit and the tensioning cylinder. The tensioning cylinder is connected between the hydraulic motor and the head of the conveyor belt to absorb tension fluctuations.

5. The automatic tensioning system for a belt conveyor according to claim 2, characterized in that: The tensioning unit includes a winch motor unit, a forward and reverse electromagnetic starter, a brake motor and a brake motor starter. The control host controls the winch motor unit to rotate forward or reverse through the forward and reverse electromagnetic starter. The winch motor unit realizes the tensioning and relaxation of the conveyor belt head through the traction rope. The control host controls the opening and closing of the brake motor through the brake motor starter, and the brake motor is used to drive the power component of the brake brake to brake the conveyor belt.

6. The automatic tensioning system for a belt conveyor according to claim 3 or 5, characterized in that: During the startup period, the control host controls the tensioning unit to tension the conveyor belt head so that the tension of the conveyor belt is ≥ 150% of the tension during normal operation.

7. The automatic tensioning system for a belt conveyor according to claim 6, characterized in that: During normal operation, the host computer controls the tensioning unit to relax the conveyor belt head so that the tension of the conveyor belt is 100% of the tension during normal operation.

8. The automatic tensioning system for a belt conveyor according to claim 7, characterized in that: During the shutdown phase, the control host controls the tensioning unit to relax the conveyor belt head so that the tension of the conveyor belt is ≤ 90% of the tension during normal operation.

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