An automatic tensioning device for shield machine belt conveyor and its application

Abstract

The present invention provides an automatic adjustment device capable of automatically detecting the conveyor belt speed, comparing relevant data, and automatically adjusting the belt conveyor drive end. The device comprises a fixed frame, a movable frame, an oil cylinder, a slot, a claw, a speed sensor, and a controller. The fixed frame is integrally mounted on the top of a trailer. The movable frame is movably mounted on the fixed frame. The slot is provided on the fixed frame, and its working surface is a single-bevel sawtooth shape. The claw is made of elastic material and forms a one-way limit under the action of the slot. The controller comprises a data processing unit configured to compare the conveyor belt speed data transmitted by the speed sensor with the speed data of the drive roller, and to issue a command to a power unit based on the comparison result. The power unit drives or stops the movable frame from moving relative to the fixed frame based on the command issued by the controller. When using this device for adjustment, the belt conveyor does not need to be shut down and no personnel are required to perform on-site operations, thereby improving the conveying efficiency of the belt conveyor.

Description

Technical Field

[0001] The present invention belongs to the technical field of shield machines, and in particular relates to a shield machine belt conveyor device, specifically to an automatic tensioning device for the active end of the belt conveyor and its application. The device can automatically detect and compare the rotational speeds of the belt conveyor's active roller and a slag conveyor belt, and automatically adjust the belt conveyor's active end according to the detection results to meet the rotational speed requirements of the slag conveyor belt. Background Art

[0002] The belt conveyor is one of the core devices for conveying excavated soil in an earth pressure balance shield machine. Its main function is to continuously transport the excavated soil discharged from the front shield chamber by the screw conveyor to the excavator, thereby ensuring the normal excavation of the shield machine. The existing belt conveyor structure mainly consists of a driven roller, a driving roller, a belt frame, an excavated soil conveyor belt, and rollers. When the belt conveyor is in operation, the drive motor transmits torque to the driving roller, and the excavated soil conveyor belt is installed between the driving and driven rollers. When the driving roller rotates, the friction between the roller and the excavated soil conveyor belt drives the driven roller and corresponding rollers to rotate, thus realizing the designed function of the belt conveyor and ensuring the normal excavation of the shield machine.

[0003] The slag conveyor belt is made of a rubber and steel wire braid. After the belt conveyor has been running for a long time, the conveyor belt will stretch and deform due to the long-term stress and heat. In other words, the slag conveyor belt will stretch, resulting in insufficient friction between the conveyor belt and the roller, which in turn causes the conveyor belt to slip. In other words, the speed between the slag conveyor belt and the active roller cannot be kept consistent, which affects the output efficiency of the slag and slows the tunneling speed of the shield machine. To ensure the rotation speed of the slag conveyor belt, a tensioning device must be designed at the belt conveyor drive end to adjust when the conveyor belt stretches. Currently, the belt conveyor tensioning device is manually adjusted, that is, a hand chain hoist or screw is designed at the belt conveyor drive end. When the conveyor belt speed is insufficient, the operator manually adjusts the hand chain hoist chain length or screw length to ensure the conveyor belt speed. The above adjustment method has the following disadvantages: 1) The adjustment of the belt conveyor drive end is non-dynamic, that is, the drive end can be adjusted after the belt conveyor system stops, which affects the tunneling efficiency of the shield machine; 2) The adjustment of the drive end is manual, and the operator needs to adjust the drive end on the top of the trailer, which is relatively complicated.

[0004] Based on the above situation, it is necessary to invent a belt conveyor tensioning device that can solve the above problems. The device can continuously monitor the transmission speed of the conveyor belt, compare the monitored data with the drive roller, and adjust the tension of the belt conveyor drive end according to the speed relationship between the two, so as to meet the excavation requirements of the soil bin slag. Summary of the Invention

[0005] In response to the problems existing in the existing earth pressure balance shield machine belt conveyor tensioning device, the present invention provides an automatic adjustment device that can automatically detect the conveyor belt speed, compare relevant data, and automatically adjust the belt conveyor drive end. When using this device for adjustment, the belt conveyor does not need to be shut down and no personnel are required to perform on-site operation, thereby improving the conveying efficiency of the belt conveyor.

[0006] The technical solutions of the present invention are as follows:

[0007] The first aspect of the present invention:

[0008] An automatic tensioning device for a shield machine belt conveyor, comprising a fixed frame, a movable frame, an oil cylinder, a clamping slot, a clamping claw, a speed sensor, and a controller;

[0009] The fixed frame is installed as a whole on the top of the trailer; the movable frame is movably installed on the fixed frame, and the belt conveyor drive motor, drive roller, etc. are all installed on the movable frame; the slot is provided on the fixed frame, and its working surface is a single oblique serrated shape; the claw is made of elastic material and is provided at a position corresponding to the slot on the movable frame, and forms a one-way limit under the action of the slot; the speed sensor is installed on the belt frame, and is used to detect the speed of the conveyor belt and transmit the conveyor belt speed data to the controller; the controller includes a data processing unit, which is configured to compare the conveyor belt speed data transmitted by the speed sensor with the speed data of the drive roller, and issue an instruction to the power unit according to the comparison result; the power unit is provided between the fixed frame and the movable frame, and drives or stops the movable frame from moving relative to the fixed frame according to the instruction issued by the controller.

[0010] Furthermore, the fixed frame and the movable frame are both welded steel structures, and when the belt conveyor is working, the fixed frame remains stationary.

[0011] Furthermore, the power unit is an oil cylinder.

[0012] Preferably, the oil cylinder is installed on the fixed frame and drives the movable frame to move by extending the piston.

[0013] Furthermore, the automatic tensioning device further includes a roller speed sensor, which is disposed on the driving roller and is used to detect the speed of the driving roller and transmit the roller speed data to the controller.

[0014] A second aspect of the present invention is a shield machine belt conveyor, comprising the above automatic tensioning device.

[0015] A third aspect of the present invention is a shield machine comprising the above automatic tensioning device.

[0016] Or, a shield machine, including the above shield machine belt conveyor.

[0017] The present invention achieves the following technical effects through the above method:

[0018] 1. The speed sensor automatically detects the conveyor belt speed. When the speed sensor detects that the conveyor belt speed cannot meet the use requirements, the controller can adjust the movable frame through the power unit. When the movable frame moves, the entire conveyor belt moves accordingly, thereby ensuring sufficient friction between the conveyor belt and the roller.

[0019] 2. The claw can only move in one direction under the action of the slot, which can effectively prevent the unidirectional displacement of the mobile frame.

[0020] 3. The belt conveyor does not need to be shut down and does not require on-site operation by personnel, which improves the conveying efficiency and automation level of the belt conveyor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of an automatic tensioning device for a shield machine belt conveyor;

[0022] Figure 2 This is the principle diagram of the automatic tensioning device of the belt conveyor;

[0023] Among them: 1. Fixed frame; 2. Mobile frame; 21 driving roller; 22. Roller speed sensor; 3. Power unit; 4. Card slot; 5. Card claw; 6. Speed sensor; 7. Controller. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0025] Example 1

[0026] An automatic tensioning device for a shield machine belt conveyor, comprising:

[0027] The fixed frame 1 is integrally mounted on the top of the trailer; the movable frame 2 is movably mounted on the fixed frame 1, and the belt conveyor drive motor, drive roller 21, etc. are all mounted on the movable frame 2. The clamping slot 4 is provided on the fixed frame 1, and its working surface is a single oblique sawtooth shape. The clamping claw 5 is made of elastic material and is provided on the movable frame 2 at a position corresponding to the clamping slot 4, and forms a one-way limit under the action of the clamping claw 4. The speed sensor 6 is mounted on the belt frame and is used to detect the speed of the conveyor belt and transmit the speed data to the controller 7. The automatic tensioning device also includes a roller speed sensor 22, which is provided on the drive roller 21 and is used to detect the speed of the drive roller 21 and transmit the speed data to the controller 7. The controller 7 includes a data processing unit configured to compare the conveyor belt speed data transmitted by the speed sensor 6 with the speed data of the drive roller 21 and issue a command to the power unit 3 based on the comparison result. The power unit 3 is disposed between the fixed frame 1 and the movable frame 2 and drives or stops the movement of the movable frame 2 relative to the fixed frame 1 based on the command issued by the controller 7.

[0028] The fixed frame 1 and the movable frame 2 are both welded steel structures; when the belt conveyor is working, the fixed frame 1 remains stationary.

[0029] The power unit 3 is an oil cylinder; the oil cylinder 3 is installed on the fixed frame and drives the movable frame to move by extending the piston.

[0030] Example 2

[0031] A shield machine belt conveyor comprises the automatic tensioning device described in the first embodiment.

[0032] Example 3

[0033] A shield machine comprises the automatic tensioning device described in the first embodiment.

[0034] as well as:

[0035] A shield machine includes the shield machine belt conveyor described in the second embodiment.

[0036] The working principle of the device is as follows: when the shield machine is excavating normally, the slag in the soil bin is transported to the head of the belt conveyor through the screw conveyor, and under the drive of the belt conveyor drive device, the slag conveyor belt transports the slag to the belt conveyor outlet; after the belt conveyor has been running for a long time, the conveyor belt will elongate under the influence of friction heat and material, causing the friction between the conveyor belt and the active roller to decrease, resulting in the conveyor belt speed being out of sync with the active roller speed. The greater the elongation, the lower the conveyor belt speed, and the lower the slag output efficiency, which seriously restricts the excavation speed of the shield machine; when the conveyor belt speed drops to a certain value, the controller 7 compares the speed signal value detected by the speed sensor 6 with the speed value of the active roller. When the comparison value is lower than the program setting value, the controller 7 sends an action instruction to the relevant components according to the pre-compiled control program. The cylinder 3 extends under the action of the hydraulic oil, and the movable frame 2 moves accordingly. The claw 5 installed on the movable frame 2 slides unidirectionally in the slot 4; during the movement of the movable frame 2, the speed sensor 6 continuously transmits relevant signals to the controller 7 and compares them with the speed value of the active roller. When the corresponding comparison value is greater than the program setting value, the controller 7 sends a stop signal to the relevant components, and the cylinder 3 stops extending. At this time, the claw 5 and the movable frame 2 stop. Under the unidirectional action of the claw 5 and the slot 4, the movable frame 2 is fixed in the corresponding position. At this time, the conveyor belt speed meets the use requirements.

[0037] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to be within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic tensioning device for a shield machine belt conveyor, comprising a fixed frame, a movable frame, a cylinder, a slot, a claw, a speed sensor, and a controller; characterized in that: - tached to the vehicle frame, and means for transmitting the transmission belt of the vehicle frame to the driver, so that the vehicle frame can be moved along the trolley track to the driver, so that the trolley track can be moved along the trolley track to the vehicle frame. - tached to the vehicle frame, and means for transmitting the transmission belt transmission belt of the vehicle frame to the driver, so that the vehicle frame can be moved along the trolley track to the vehicle frame. The fixed frame and the movable frame are both welded steel structures. When the belt conveyor is working, the fixed frame remains stationary. The automatic tensioning device further includes a roller speed sensor, which is disposed on the driving roller and is used to detect the speed of the driving roller and transmit the roller speed data to the controller.

2. A shield machine belt conveyor, characterized in that: Including the automatic tensioning device according to claim 1.

3. A shield machine, characterized in that: Including the automatic tensioning device according to claim 1.

4. A shield machine, characterized in that: Including the shield machine belt conveyor according to claim 2.

Images