Short-distance belt conveyor swing tensioning device and control method thereof

Abstract

The invention relates to a short-distance swing tensioning device of a belt conveyor and a control method of the short-distance swing tensioning device. The short-distance swing tensioning device comprises an electro-hydraulic push rod, a swing arm, a swing arm roller assembly, a first turnabout roller and a second turnabout roller. The swing arm roller assembly is composed of a driving end roller, a middle roller and a swing end roller. The rubber belt sequentially bypasses the head wheel, the first turnabout drum, the swing end drum, the middle drum, the driving end drum, the second turnabout drum and the tail wheel to form a closed annular structure. The return rubber belt of the belt conveyor is folded by swinging the tensioning device, and the effect of tensioning the rubber belt is achieved; the positions of the head wheel and the tail wheel of the belt conveyor can be kept fixed, and automatic adjustment of the tension of the rubber belt can be achieved by monitoring the tension of the rubber belt and the stroke of the electro-hydraulic push rod.

Description

Technical Field

[0001] The present invention relates to the technical field of belt conveyors, and particularly to a swing tensioning device for a short-distance belt conveyor and a control method thereof. Background Art

[0002] To ensure the normal operation of a belt conveyor, the conveyor belt must have a certain tension, and the device that provides the tension is the tensioning device. The tensioning device is a device that adjusts the tension of the conveyor belt and generates the tension required for frictional drive. The so-called "tensioning" has two meanings: absorbing the elongation of the conveyor belt and providing tension for the conveyor belt.

[0003] The functions of the belt conveyor tensioning device are as follows: (1) To make the conveyor belt have sufficient tension to ensure that sufficient driving force can be generated between the conveyor belt and the driving roller to prevent slipping; (2) To ensure that the tension at each point of the conveyor belt is not lower than a given value to prevent the conveyor belt from being overly slack between the idlers, which may cause material spillage and increase the running resistance; (3) To compensate for the elastic and plastic deformation of the conveyor belt; (4) To provide the necessary stroke for reconnecting the conveyor belt.

[0004] Generally, the belt tensioning devices of belt conveyors are divided into three types according to the layout form: vertical tensioning device, vehicle-type tensioning device, and screw tensioning device. Among the three tensioning devices, the screw tensioning device is a fixed tensioning device. The manually adjusted stroke range and tension are limited, and it is suitable for short-distance belt conveyors within 30 m in length and belt conveyors installed on mobile equipment. For belt conveyors transporting light materials and with a particularly small conveying capacity, the application range of the conveyor length can be appropriately increased.

[0005] Currently, most of the tensioning devices for short-distance belt conveyors adopt screw tensioning devices. However, the existing screw tensioning devices for short-distance belt conveyors have the following problems:

[0006] 1) Whether the screw tensioning device is arranged at the tail or the head of the conveyor, the position of the tail pulley or the head pulley will change with the change of the tensioning stroke. Especially for a reversible belt conveyor, where unloading is required at both the head and the tail, the displacement of the head pulley or the tail pulley will change the material dropping point of the downstream belt conveyor, resulting in the material on the downstream belt conveyor deviating from the center and ultimately causing the downstream belt conveyor to run off track.

[0007] 2) The screw tensioning has the characteristics of simple structure and compact layout. However, the manually adjusted tension and stroke range of the screw tensioning are small. The adjustment of the tensioning force is only carried out based on experience and observing the state of the conveyor belt, and it cannot automatically maintain a constant pre-tension, so manual adjustment is often required.

[0008] In summary, if the tension of the belt conveyor can be automatically adjusted according to the tension change of the operating conditions and the position change of the take-up drum can be automatically responded to, it will provide good guarantee for the stable operation of the short-distance belt conveyor. Summary of the Invention

[0009] The present invention provides a swing take-up device for a short-distance belt conveyor and its control method. The return belt of the belt conveyor is folded by the swing take-up device to play a role in tensioning the belt. It can not only keep the positions of the head pulley and the tail pulley of the belt conveyor fixed, but also realize automatic adjustment of the belt tension through monitoring of the belt tension and the stroke of the electro-hydraulic push rod.

[0010] To achieve the above object, the present invention is realized by adopting the following technical solutions:

[0011] A swing take-up device for a short-distance belt conveyor is arranged below the belt conveyor. It includes an electro-hydraulic push rod, a swing arm, a swing arm roller assembly, a redirecting roller I and a redirecting roller II. The swing arm roller assembly consists of a driving-end roller, a middle roller and a swing-end roller. The electro-hydraulic push rod is arranged on one side of the swing arm. The driving-end roller is arranged at the driving end of the swing arm, and the roller shaft of the driving-end roller is hinged to the extending end of the electro-hydraulic push rod. The middle roller is arranged in the middle of the swing arm, and the roller shaft of the middle roller is hinged to the leg of the belt conveyor frame. The swing-end roller is arranged at the swing end of the swing arm. The redirecting roller I is arranged upstream of the swing take-up device on the return path of the belt, and the redirecting roller II is arranged downstream of the swing take-up device on the return path of the belt. The belt sequentially passes around the head pulley, the redirecting roller I, the swing-end roller, the middle roller, the driving-end roller, the redirecting roller II and the tail pulley to form a closed loop structure.

[0012] A swing take-up device for a short-distance belt conveyor further includes a control system. The control system consists of a main controller, a travel switch, a belt tension monitoring device and a clutch controller. A travel switch is arranged outside the extending end of the electro-hydraulic push rod, and a belt tension monitoring device is arranged on the roller shaft of the swing-end roller. A tension self-locking mechanism with a clutch function is arranged between the middle roller and the swing rod and is controlled by the clutch controller. The signal output ends of the travel switch and the belt tension monitoring device are respectively connected to the control system, and the control system is additionally connected to the control ends of the electro-hydraulic push rod and the clutch controller.

[0013] Further, the tension self-locking mechanism is a ratchet and pawl self-locking mechanism, and the clutch controller is an electromagnetic controller. The electromagnetic controller is used to control the pawl to disengage from the corresponding positioning groove in the ratchet radially or axially.

[0014] Further, the electro-hydraulic push rod is arranged on a push rod support.

[0015] Further, the driving end roller has an initial working position, and a driving end roller support is provided on the leg of the belt conveyor frame at the position corresponding to the initial working position of the driving end roller; when the driving end roller is in the initial working position, the corresponding roller shaft abuts against the groove of the driving end roller support.

[0016] Further, a middle roller support is provided on the leg of the belt conveyor frame, and the roller shaft of the middle roller is hinged to the middle roller support.

[0017] Further, the swing arm and the swing arm roller assembly are arranged in groups to form a swing assembly. Multiple swing assemblies are provided in the swing tensioning device. The roller shafts of the driving end rollers in multiple swing assemblies are connected by a first connecting rod, and the roller shafts of the swing end rollers in multiple swing assemblies are connected by a second connecting rod; multiple swing assemblies are driven to act synchronously by an electro-hydraulic push rod; after the tape bypasses the head pulley and the first redirecting roller, it sequentially bypasses the swing end rollers, middle rollers and driving end rollers in each swing assembly, and then bypasses the second redirecting roller and the tail pulley to form a closed loop structure.

[0018] A control method for a swing tensioning device of a short-distance belt conveyor includes the following steps:

[0019] 1) According to the bandwidth, belt speed, throughput, and belt type of the belt conveyor, calculate the range value of the belt tension required for the normal operation of the belt conveyor, and preset the upper limit value and lower limit value of the belt tension in the main controller according to the calculated range value of the belt tension;

[0020] 2) The driving end roller is located at the initial working position, and the pre-tension value of the belt after vulcanization bonding on the belt conveyor is higher than the preset lower limit value of the belt tension;

[0021] 3) The tension value of the belt is detected in real time by a belt tension monitoring device. When the detected value is lower than the preset lower limit value of the belt tension, the main controller controls the electro-hydraulic push rod to start;

[0022] 4) The main controller controls the extending end of the electro-hydraulic push rod to extend and move a set stroke unit in cooperation with the travel switch; when the detected value of the belt tension monitoring device is higher than the preset lower limit value of the belt tension, the main controller controls the electro-hydraulic push rod to stop working;

[0023] 5) After the electro-hydraulic push rod stops working, the swing arm loses the driving force, and the tension of the belt causes the swing arm to swing in the reverse direction and drive the ratchet to reverse. The swing arm is locked in position by the pawl stuck in the positioning groove of the ratchet, so as to keep the tension of the belt within the preset range of the belt tension;

[0024] 6) The tape tension monitoring device detects the tension value of the tape in real time. When the detected value is higher than the preset upper limit value of the tape tension, the main controller issues commands to the clutch controller and the electro-hydraulic push rod. The clutch controller controls the pawl to disengage from the positioning groove in the ratchet wheel, and the extending end of the electro-hydraulic push rod retracts, moving a set stroke unit in cooperation with the travel switch.

[0025] 7) When the belt conveyor is working, repeat steps 3)-6) to keep the tape tension within the set tape tension range value all the time.

[0026] Furthermore, when the stroke of the electro-hydraulic push rod reaches the maximum preset stroke of the travel switch and the detected value of the tape tension monitoring device reaches the preset lower limit value of the tape tension, the main controller gives an alarm. After the on-site staff confirm, the belt conveyor stops working. By manually issuing a command to the main controller, the clutch controller is used to control the tensioning self-locking mechanism to disengage, and the driving end roller returns to the initial working position. At this time, the tape is in a relaxed state. After the tape is bonded or replaced, the belt conveyor can be put into use again.

[0027] Furthermore, when using a swing tensioning device with multiple groups of swing components, when the electro-hydraulic push rod acts, it drives multiple groups of swing components to act synchronously through link one and link two; the tape tension monitoring device provided in any one group of swing components detects the tape tension value in real time.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1) It can realize the automatic detection and automatic adjustment of the tape tension of the belt conveyor and keep the preset tape tension constant; the electro-hydraulic push rod, as the power source for adjusting the tape tension, does not need to work continuously and only acts when the tension needs to be adjusted.

[0030] 2) Compared with the conventional tensioning device, it can ensure the fixed positions of the tail wheel and the head wheel of the belt conveyor, and the head wheel and the tail wheel will not change with the change of the tensioning stroke; especially for a reversible belt conveyor, the fixed positions of the head wheel and the tail wheel will not cause changes in the feeding point of the downstream belt conveyor, and will not cause the downstream belt conveyor to deviate due to the material on the downstream belt conveyor deviating from the center.

[0031] 3) The swing tensioning device of the belt conveyor can be set in groups, which can multiply the tensioning stroke of the belt conveyor tape.

[0032] 4) Through the monitoring of the tape tension and the stroke of the electro-hydraulic push rod, the automatic adjustment of the tape tension is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of a swing tensioning device of a belt conveyor described in the present invention Figure 1 .

[0034] Figure 2 is the installation schematic diagram of a swing tensioning device for a belt conveyor according to the present invention Figure 1 (The swing tensioning device is in the initial state).

[0035] Figure 3 is the installation schematic diagram of a swing tensioning device for a belt conveyor according to the present invention Figure 2 (The swing tensioning device is in the working state).

[0036] Figure 4 is the schematic diagram of the swing arm roller assembly according to the present invention

[0037] Figure 5 is the structural schematic diagram of the swing end roller according to the present invention

[0038] Figure 6 is the schematic diagram of the control system of a swing tensioning device for a belt conveyor according to the present invention

[0039] Figure 7 is the schematic diagram of the grouped setting of a swing tensioning device for a belt conveyor according to the present invention Figure 1 (The combined swing tensioning device is in the initial state).

[0040] Figure 8 is the schematic diagram of the grouped setting of a swing tensioning device for a belt conveyor according to the present invention Figure 2 (The combined swing tensioning device is in the working state).

[0041] In the figure: 1. Electro-hydraulic push rod; 2. Travel switch; 3. Swing arm; 4. Middle roller support; 5. Driving end roller support; 6. Driving end roller; 7. Middle roller; 8. Swing end roller; 9. Ratchet and pawl self-locking mechanism; 10. Clutch controller; 11. Redirecting roller I; 12. Redirecting roller II; 13. Belt Specific embodiments

[0042] The following further describes the specific embodiments of the present invention with reference to the accompanying drawings:

[0043] As Figures 1-3 shown, a swing tensioning device for a short-distance belt conveyor according to the present invention is arranged below the belt conveyor; it includes an electro-hydraulic push rod 1, a swing arm 3, a swing arm roller assembly, a redirecting roller I 11, and a redirecting roller II 12; as Figure 4As shown in the figure, the swing arm roller assembly consists of a drive-end roller 6, a middle roller 7, and a swing-end roller 8. The electro-hydraulic push rod 1 is arranged on one side of the swing arm 3. The drive-end roller 6 is arranged at the drive end of the swing arm 3, and the roller shaft of the drive-end roller 6 is hinged to the extended end of the electro-hydraulic push rod 1. The middle roller 7 is arranged in the middle of the swing arm 3, and the roller shaft of the middle roller 7 is hinged to the leg of the belt conveyor frame. The swing-end roller 8 (as Figure 5 shown) is arranged at the swing end of the swing arm 3. The redirecting roller 11 is arranged upstream of the swing tensioning device in the return path of the belt 13, and the redirecting roller 12 is arranged downstream of the swing tensioning device in the return path of the belt 13. After the belt 13 passes around the head pulley, the redirecting roller 11, the swing-end roller 8, the middle roller 7, the drive-end roller 6, the redirecting roller 11, and the tail pulley in sequence, a closed loop structure is formed.

[0044] The swing tensioning device of the short-distance belt conveyor of the present invention further includes a control system. As Figure 1 , Figure 6 shown, the control system consists of a main controller, a travel switch 2, a belt tension monitoring device, and a clutch controller 10. A travel switch 2 is arranged outside the extended end of the electro-hydraulic push rod 1, and a belt tension monitoring device (such as a resistance strain force sensor) is arranged on the roller shaft of the swing-end roller 8. A tensioning self-locking mechanism with a clutch function is arranged between the middle roller 7 and the swing rod 3, and is controlled by the clutch controller 10. The signal output ends of the travel switch 2 and the belt tension monitoring device are respectively connected to the control system, and the control system is additionally connected to the control ends of the electro-hydraulic push rod 1 and the clutch controller 10.

[0045] Furthermore, the tensioning self-locking mechanism is a ratchet and pawl self-locking mechanism 9, and the clutch controller 10 is an electromagnetic controller. The electromagnetic controller is used to control the pawl to disengage from the corresponding positioning groove in the ratchet radially or axially.

[0046] Furthermore, the electro-hydraulic push rod 1 is arranged on a push rod support.

[0047] Furthermore, the drive-end roller 6 has an initial working position, and a drive-end roller support 5 is arranged on the leg of the belt conveyor frame at the position corresponding to the initial working position of the drive-end roller 6. When the drive-end roller 6 is in the initial working position, the corresponding roller shaft abuts against the groove in the drive-end roller support 5.

[0048] Furthermore, a middle roller support 4 is arranged on the leg of the belt conveyor frame, and the roller shaft of the middle roller 7 is hinged to the middle roller support 4.

[0049] Furthermore, as Figure 7 , Figure 8As shown in the figure, in a swing tensioning device of a short-distance belt conveyor according to the present invention, a swing arm 3 and a swing arm roller assembly are grouped to form a swing assembly. Multiple groups of swing assemblies are provided in the swing tensioning device. The roller shafts of the drive-end rollers 6 among multiple groups of swing assemblies are connected by a first connecting rod, and the roller shafts of the swing-end rollers 8 among multiple groups of swing assemblies are connected by a second connecting rod. Multiple groups of swing assemblies are driven to act synchronously by an electro-hydraulic push rod 1. After the belt 13 bypasses the head pulley and the redirecting roller 11, it successively bypasses the swing-end rollers 6, the middle rollers 7, and the drive-end rollers 8 in each swing assembly, and then bypasses the redirecting roller 12 and the tail pulley to form a closed loop structure.

[0050] A control method for a swing tensioning device of a short-distance belt conveyor according to the present invention includes the following steps:

[0051] 1) According to the bandwidth, belt speed, throughput, and belt type of the belt conveyor, calculate the range value of the belt tension required for the normal operation of the belt conveyor, and preset the upper limit value and the lower limit value of the belt tension in the main controller according to the calculated range value of the belt tension.

[0052] 2) The drive-end roller 6 is in the initial working position, and the pre-tension value of the belt 13 after vulcanization bonding on the belt conveyor is higher than the preset lower limit value of the belt tension.

[0053] 3) The tension value of the belt 13 is detected in real time through a belt tension monitoring device. When the detected value is lower than the preset lower limit value of the belt tension, the main controller controls the electro-hydraulic push rod 1 to start.

[0054] 4) The main controller controls the extended end of the electro-hydraulic push rod 1 to extend and move a set stroke unit in cooperation with the travel switch 2. When the detected value of the belt tension monitoring device is higher than the preset lower limit value of the belt tension, the main controller controls the electro-hydraulic push rod 1 to stop working.

[0055] 5) After the electro-hydraulic push rod 1 stops working, the swing arm 3 loses the driving force, and the tension of the belt 13 causes the swing arm 3 to swing in the reverse direction and drive the ratchet to reverse. The swing arm 3 is self-locked in position by the pawl being stuck in the positioning groove in the ratchet, so as to keep the tension of the belt 13 within the preset range of the belt tension.

[0056] 6) The tension value of the belt 13 is detected in real time through a belt tension monitoring device. When the detected value is higher than the preset upper limit value of the belt tension, the main controller issues commands to the clutch controller 10 and the electro-hydraulic push rod 1. The clutch controller 10 controls the pawl to disengage from the positioning groove in the ratchet, and the extended end of the electro-hydraulic push rod 1 retracts and moves a set stroke unit in cooperation with the travel switch 2.

[0057] 7) When the belt conveyor is working, repeat steps 3)-6) to keep the tension of the belt 13 always within the set range value of the belt tension.

[0058] Further, when the stroke of the electro-hydraulic push rod 1 reaches the maximum stroke preset by the travel switch 2, and the detected value of the belt tension monitoring device reaches the preset lower limit value of the belt tension, the main controller alarms. After the on-site staff confirm, the belt conveyor stops working; by manually sending an instruction to the main controller, the clutch controller 10 controls the tensioning self-locking mechanism to disengage, and the driving end roller 6 returns to the initial working position. At this time, the belt 13 is in a relaxed state. After bonding or replacing the belt 13, the belt conveyor can be put into use again.

[0059] Further, when using a swing tensioning device with multiple groups of swing components, when the electro-hydraulic push rod 1 acts, the multiple groups of swing components are driven to act synchronously through the first connecting rod and the second connecting rod; the belt tension monitoring device provided in any one group of swing components detects the belt tension value in real time.

[0060] The swing tensioning device of the present invention can fold the return belt of the belt conveyor, achieving the purpose of tensioning the belt and making the belt tension meet the working requirements of the belt conveyor. Compared with the existing belt tensioning devices, it can not only keep the positions of the head pulley and the tail pulley of the belt conveyor fixed, but also control the action of the electro-hydraulic push rod through the monitoring of the belt tension and the swing rod stroke, realizing the automatic adjustment of the belt pre-tension. The swing tensioning device of the present invention can be set in groups, and can multiply the tensioning stroke of the belt of the belt conveyor.

[0061] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. A swing tensioning device for a short-distance belt conveyor, which is arranged below the belt conveyor; characterized in that, It includes an electro-hydraulic push rod, a swing arm, a swing arm roller assembly, a redirecting roller I and a redirecting roller II; the swing arm roller assembly consists of a drive-end roller, a middle roller and a swing-end roller; the electro-hydraulic push rod is arranged on one side of the swing arm, the drive-end roller is arranged at the drive end of the swing arm, and the roller shaft of the drive-end roller is hinged to the extended end of the electro-hydraulic push rod; the middle roller is arranged in the middle of the swing arm, and the roller shaft of the middle roller is hinged to the leg of the belt conveyor frame; the swing-end roller is arranged at the swing end of the swing arm; the redirecting roller I is arranged upstream of the swing tensioning device on the return path of the belt, and the redirecting roller II is arranged downstream of the swing tensioning device on the return path of the belt; the belt successively winds around the head pulley, the redirecting roller I, the swing-end roller, the middle roller, the drive-end roller, the redirecting roller II and the tail pulley to form a closed loop structure.

2. The swing tensioning device of a short-distance belt conveyor according to claim 1, characterized in that, It also includes a control system; the control system consists of a main controller, a travel switch, a belt tension monitoring device and a clutch controller; a travel switch is arranged outside the extended end of the electro-hydraulic push rod, and a belt tension monitoring device is arranged on the roller shaft of the swing-end roller; a tensioning self-locking mechanism is arranged between the middle roller and the swing rod, the tensioning self-locking mechanism has a clutch function and is controlled by the clutch controller; the signal output ends of the travel switch and the belt tension monitoring device are respectively connected to the control system, and the control system is additionally connected to the control ends of the electro-hydraulic push rod and the clutch controller.

3. The swing tensioning device of a short-distance belt conveyor according to claim 2, characterized in that, The tensioning self-locking mechanism is a ratchet and pawl self-locking mechanism, and the clutch controller is an electromagnetic controller; the electromagnetic controller is used to control the pawl to disengage from the corresponding positioning groove in the ratchet radially or axially.

4. A short-distance belt conveyor swing tensioning device according to claim 1, characterized in that, The electro-hydraulic push rod is arranged on a push rod support.

5. A short-distance belt conveyor swing tensioning device according to claim 1, characterized in that, The drive-end roller has an initial working position, and a drive-end roller support is arranged on the leg of the belt conveyor frame at the position corresponding to the initial working position of the drive-end roller; when the drive-end roller is in the initial working position, the corresponding roller shaft abuts against the groove of the drive-end roller support.

6. A short-distance belt conveyor swing tensioning device according to claim 1, characterized in that, A middle roller support is arranged on the leg of the belt conveyor frame, and the roller shaft of the middle roller is hinged to the middle roller support.

7. A short-distance belt conveyor swing tensioning device according to claim 1, characterized in that, The swing arm and the swing arm roller assembly are arranged in groups to form a swing assembly, multiple swing assemblies are arranged in the swing tensioning device, the roller shafts of the drive-end rollers among the multiple swing assemblies are connected by a connecting rod I, and the roller shafts of the swing-end rollers among the multiple swing assemblies are connected by a connecting rod II; the multiple swing assemblies are driven by one electro-hydraulic push rod to move synchronously; after the belt winds around the head pulley and the redirecting roller I, it successively winds around the swing-end roller, the middle roller and the drive-end roller in each swing assembly, and then winds around the redirecting roller II and the tail pulley to form a closed loop structure.

8. A control method for the swing tensioning device of a short-distance belt conveyor according to any one of claims 1 to 6, characterized in that It includes the following steps: 1) According to the belt width, belt speed, throughput and belt type of the belt conveyor, calculate the range value of the belt tension required for the normal operation of the belt conveyor, and preset the upper limit value and the lower limit value of the belt tension in the main controller according to the calculated range value of the belt tension; 2) The drive-end roller is located at the initial working position, and the pre-tension value of the belt after vulcanization bonding on the belt conveyor is higher than the preset lower limit value of the belt tension; 3) The tension value of the belt is detected in real time by the belt tension monitoring device. When the detected value is lower than the preset lower limit value of the belt tension, the main controller controls the electro-hydraulic push rod to start; 4) The main controller controls the extending end of the electro-hydraulic push rod to extend and move a set stroke unit in cooperation with the travel switch; when the detected value of the belt tension monitoring device is higher than the preset lower limit value of the belt tension, the main controller controls the electro-hydraulic push rod to stop working; 5) After the electro-hydraulic push rod stops working, the swing arm loses the driving force, and the tension of the belt causes the swing arm to swing in the reverse direction, driving the ratchet to reverse. The swing arm is locked in position by the pawl stuck in the positioning groove of the ratchet, so as to keep the tension of the belt within the preset belt tension range; 6) The tension value of the belt is detected in real time by the belt tension monitoring device. When the detected value is higher than the preset upper limit value of the belt tension, the main controller sends commands to the clutch controller and the electro-hydraulic push rod. The clutch controller controls the pawl to disengage from the positioning groove in the ratchet, and the extending end of the electro-hydraulic push rod retracts and moves a set stroke unit in cooperation with the travel switch; 7) Steps 3)-6) are repeated during the operation of the belt conveyor to keep the belt tension always within the set belt tension range value.

9. The control method of a swing tensioning device for a short-distance belt conveyor according to claim 8, characterized in that, When the stroke of the electro-hydraulic push rod reaches the maximum preset stroke of the travel switch and the detected value of the belt tension monitoring device reaches the preset lower limit value of the belt tension, the main controller alarms. After the on-site staff confirm, the belt conveyor stops working; by manually sending a command to the main controller, the clutch controller is used to control the tensioning self-locking mechanism to disengage, and the driving end roller returns to the initial working position. At this time, the belt is in a slack state. After the belt is bonded or replaced, the belt conveyor can be put back into use.

10. The control method of a swing tensioning device for a short-distance belt conveyor according to claim 8, characterized in that, When using a swing tensioning device with multiple groups of swing components, when the electro-hydraulic push rod acts, multiple groups of swing components are driven to act synchronously through the first connecting rod and the second connecting rod; the belt tension monitoring device provided in any one group of swing components detects the belt tension value in real time.

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