Bidirectional belt conveyor conveying system and method for long-distance large-longitudinal-slope tunnel construction

Abstract

The invention discloses a two-way belt conveyor conveying system and method for long-distance large-longitudinal-slope tunnel construction. The conveying system comprises a two-way belt conveyor which is arranged in an adit and used for synchronously carrying out tunnel construction deslagging and gravel aggregate conveying. The sandstone aggregate feeding and transporting device and the slag discharging and transporting device are arranged outside the tunnel; and the sandstone aggregate discharging and transporting device and the slag feeding and transporting device are arranged in the main tunnel and branch tunnel crossed and expanded cavern. The device is simple in structure, the gravel aggregate feeding and conveying device, the two-way belt conveyor and the gravel aggregate discharging and conveying device jointly achieve the function that a lower-layer belt of the two-way belt conveyor carries materials in a return mode, and the slag feeding and conveying device, the two-way belt conveyor and the slag discharging and conveying device jointly achieve the function that an upper-layer belt of the two-way belt conveyor discharges slag. The purpose of bidirectional transportation of the blasting slag and the gravel aggregate in the long-distance large-longitudinal-slope tunnel construction is achieved, and the technical problem of safe and efficient transportation of the slag in the long-distance large-longitudinal-slope tunnel construction can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of water conveyance tunnel construction, and in particular relates to a bidirectional belt conveyor transportation system and method for long-distance and large longitudinal slope tunnel construction. Background Art

[0002] In the construction of traditional water conveyance tunnels, slag and gravel aggregate are mostly transported by car or belt conveyor. When the slope of the branch tunnel is large and the slope is straight to the bottom, and the transportation space of the branch tunnel excavation section is extremely narrow, car transportation has serious shortcomings such as high risk and low efficiency. Belt conveyor transportation is adopted because it occupies a small working space, convenient construction organization, small ventilation pressure and transportation cost. However, when existing tunnels use belt conveyors to discharge slag or transport gravel aggregate, it is mainly one-way transportation, that is, one-way discharge or one-way transportation of gravel aggregate. For the construction of tunnels with long distances and large longitudinal slopes, when slag is discharged, the transportation is very slow. When the material and the gravel aggregate need to be transported in opposite directions by a belt conveyor, two belt conveyors are usually required to achieve the conveying task; if two-way transportation is considered, since the return conveyor is running downhill, it is necessary to prevent the car from slipping. During the return conveyor, the belt is in a fully loaded running state. Affected by inertia and gravity acceleration, the belt running speed will gradually increase. When the main drive motor exceeds the set speed, since the main drive motor is in a power generation state, the traction force is negative at this time, and the car is very likely to slip when it stops; the existing gravel aggregate storage silo occupies a large area, and the open stacking of gravel aggregate is easily contaminated. Therefore, a two-way belt conveyor transportation system and method for long-distance and large longitudinal slope tunnel construction should be provided. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a two-way belt conveyor transportation system and method for the construction of long-distance and steep longitudinal slope tunnels in view of the deficiencies in the above-mentioned prior art. The system and method have a simple structure and a reasonable design. The sand and gravel aggregate loading and transportation device, the two-way belt conveyor and the sand and gravel aggregate unloading and transportation device jointly realize the function of the lower belt of the two-way belt conveyor returning materials, and the slag loading and transportation device, the two-way belt conveyor and the slag unloading and transportation device jointly realize the function of the upper belt of the two-way belt conveyor discharging slag, thereby realizing the purpose of two-way transportation of blasting slag and sand and gravel aggregate in the construction of long-distance and steep longitudinal slope tunnels, and being able to solve the technical problem of safe and efficient transportation of slag in the construction of long-distance and steep longitudinal slope tunnels.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a two-way belt conveyor transportation system for long-distance and large longitudinal slope tunnel construction, characterized in that it includes a two-way belt conveyor arranged in a branch tunnel for synchronously carrying out slag discharge and sand and gravel aggregate transportation in tunnel construction, a sand and gravel aggregate loading and transportation device and a slag material unloading and transportation device arranged outside the tunnel, and a sand and gravel aggregate unloading and transportation device and a slag material loading and transportation device arranged in the cross-expanded cavern of the main tunnel and the branch tunnel; the sand and gravel aggregate loading and transportation device includes an outside-tunnel sand and gravel aggregate storage bin arranged outside the tunnel, a sand and gravel aggregate loading hopper, a first large-angle belt conveyor and a first horizontal belt conveyor connected to the discharging end of the first large-angle belt conveyor, the discharging end of the first horizontal belt conveyor is connected to the lower belt of the two-way belt conveyor; the sand and gravel aggregate unloading and transportation device The conveying device includes a third large-angle belt conveyor connected to the sand and gravel aggregate discharge end of the two-way belt conveyor and a mobile reversible belt conveyor connected to the third large-angle belt conveyor, and the discharge end of the mobile reversible belt conveyor is provided with an in-tunnel sand and gravel aggregate storage bin; the slag loading and transportation device includes an in-tunnel slag temporary storage hole, a slag loading hopper, a slag crusher, a second large-angle belt conveyor and a second horizontal belt conveyor connected to the discharge end of the second large-angle belt conveyor, and the discharge end of the second horizontal belt conveyor is connected to the upper belt of the two-way belt conveyor; the slag unloading and transportation device includes an out-tunnel slag transfer belt conveyor connected to the slag discharge end of the two-way belt conveyor and a discharge pool connected to the discharge end of the out-tunnel slag transfer belt conveyor, and an electric-controlled hydraulic brake roller mechanism is provided on the lower belt of the two-way belt conveyor.

[0005] The above-mentioned bidirectional belt conveyor transportation system for long-distance and large longitudinal slope tunnel construction is characterized in that the driving mechanism of the bidirectional belt conveyor is arranged outside the tunnel, and the driving mechanism includes three main driving motors, and the three main driving motors are all controlled by a PLC controller and a frequency converter.

[0006] The above-mentioned bidirectional belt conveyor transportation system for long-distance and large longitudinal slope tunnel construction is characterized in that: the electronically controlled hydraulic brake roller mechanism includes multiple hydraulic brake rollers, and the multiple hydraulic brake rollers are all controlled by a microcontroller. A speed sensor is provided on the lower belt of the bidirectional belt conveyor, and the microcontroller and the speed sensor are both connected to the PLC controller.

[0007] The above-mentioned bidirectional belt conveyor transportation system for long-distance and large longitudinal slope tunnel construction is characterized in that a tensioning tower is provided on the upper belt of the bidirectional belt conveyor, and a cleaning box is provided on the lower belt of the bidirectional belt conveyor.

[0008] The above-mentioned bidirectional belt conveyor transportation system for long-distance and large longitudinal slope tunnel construction is characterized in that the sand and gravel aggregate storage bin outside the tunnel and the sand and gravel aggregate storage bin inside the tunnel both include small stone bins, medium stone bins, pebble bins and sand and gravel bins, and the sand and gravel aggregate storage bin inside the tunnel is a steel structure storage bin.

[0009] The present invention also provides a method for bidirectionally transporting sandstone aggregate and slag using the bidirectional belt conveyor transportation system for long-distance and steep longitudinal slope tunnel construction as described above, characterized in that the method comprises:

[0010] During the transportation of sand and gravel aggregates, the order in which the five belt conveyors are started is: mobile reversible belt conveyor, third largest angle belt conveyor, bidirectional belt conveyor, first horizontal belt conveyor and first largest angle belt conveyor. The order in which the five belt conveyors are stopped is: first largest angle belt conveyor, first horizontal belt conveyor, bidirectional belt conveyor, third largest angle belt conveyor and mobile reversible belt conveyor. The transportation process of sand and gravel aggregates is as follows:

[0011] The sand and gravel aggregate in the sand and gravel aggregate storage bin outside the cave is transported to the belt of the first large-angle belt conveyor by using the sand and gravel aggregate upper hopper, and the sand and gravel aggregate is sequentially transported to the lower belt of the bidirectional belt conveyor through the first large-angle belt conveyor and the first horizontal belt conveyor, and the sand and gravel aggregate is transported to the third large-angle belt conveyor by the lower belt of the bidirectional belt conveyor, and then the sand and gravel aggregate is transported to the mobile reversible belt conveyor through the third large-angle belt conveyor, and the mobile reversible belt conveyor transports the sand and gravel aggregate to the small stone silo, the medium stone silo, the pea stone silo or the sand and gravel silo for storage;

[0012] During the slag transportation process, the four belt conveyors are started in the following order: the slag conveyor outside the tunnel, the bidirectional belt conveyor, the second horizontal belt conveyor and the second largest angle belt conveyor. The four belt conveyors are stopped in the following order: the second largest angle belt conveyor, the second horizontal belt conveyor, the bidirectional belt conveyor and the slag conveyor outside the tunnel. The slag transportation process is as follows:

[0013] The slag in the tunnel is temporarily stored by means of a slag upper hopper and a slag crusher. The slag in the tunnel is transported to the second large-angle belt conveyor. The slag is sequentially transmitted to the upper belt of the bidirectional belt conveyor through the second large-angle belt conveyor and the second horizontal belt conveyor. The upper belt of the bidirectional belt conveyor transports the sand and gravel aggregates to the slag transfer belt conveyor outside the tunnel. The slag transfer belt conveyor outside the tunnel transports the slag to the unloading pool.

[0014] The above-mentioned method for bidirectional transportation of sand and gravel aggregates and slag is characterized in that: the control process during the operation of the bidirectional belt conveyor is: the three main drive motors are controlled by the PLC controller and the frequency converter to work simultaneously, driving the belt of the bidirectional belt conveyor to run according to the set running speed of the belt. During the bidirectional operation of the bidirectional belt conveyor, the speed sensor transmits the actual running speed of the belt detected in real time to the PLC controller, and the PLC controller compares the actual running speed of the belt detected in real time with the set running speed of the belt. When the actual running speed of the belt exceeds the set running speed of the belt, the PLC controller transmits a control signal to the microcontroller, and the microcontroller controls the operation of multiple hydraulic brake rollers. At the same time, the frequency converter controls the speed of the three main drive motors to reduce the traction force of the main drive motors until the bidirectional belt conveyor runs normally according to the set running speed of the belt; the value range of the set running speed of the belt is 1.8m / s to 2.5m / s.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. The present invention arranges a bidirectional belt conveyor in a branch tunnel for synchronously discharging slag and transporting sand and gravel aggregates during tunnel construction, arranges a sand and gravel aggregate loading and transporting device and a slag unloading and transporting device outside the tunnel, arranges a sand and gravel aggregate unloading and transporting device and a slag loading and transporting device in the cross-expanded cavern of the main tunnel and the branch tunnel, the sand and gravel aggregate loading and transporting device, the bidirectional belt conveyor and the sand and gravel aggregate unloading and transporting device jointly realize the function of the lower belt of the bidirectional belt conveyor to carry materials in the return journey, and the slag loading and transporting device, the bidirectional belt conveyor and the slag unloading and transporting device jointly realize the function of the upper belt of the bidirectional belt conveyor to discharge slag.

[0017] 2. In order to avoid the phenomenon of runaway, the present invention arranges an electrically controlled hydraulic brake roller mechanism on the lower belt of the bidirectional belt conveyor. During the operation of the bidirectional belt conveyor, the operating speed of the bidirectional belt conveyor is adjusted by using the electrically controlled hydraulic brake roller mechanism, which can solve the technical problem of safe and efficient transportation of slag in long-distance and large longitudinal slope tunnel construction. Compared with the traditional method of using a brake motor to brake the reducer drive shaft, the electrically controlled hydraulic brake roller mechanism will not cause the problem of tensioning the upper belt and relaxing the lower belt, and can ensure the smooth operation of the bidirectional belt conveyor.

[0018] 3. The present invention arranges a mobile reversible belt conveyor and a sand and gravel aggregate storage bin in the tunnel at the intersection section of the main and branch tunnels. The sand and gravel aggregate storage bin in the tunnel is a steel structure aggregate bin. The mobile reversible belt conveyor is arranged above the steel structure aggregate bin. The sand and gravel aggregate are transported to the third large-angle belt conveyor by the lower belt of the two-way belt conveyor. After that, the sand and gravel aggregate are transmitted to the mobile reversible belt conveyor through the third large-angle belt conveyor. The mobile reversible belt conveyor can transport the sand and gravel aggregate to the small stone bin, the medium stone bin, the bean stone bin or the sand and gravel bin for storage, thereby realizing the single transportation of different types of sand and gravel aggregates.

[0019] 4. The present invention has a simple structure and reasonable design. It makes full use of the intersection of the main tunnel and the branch tunnel to expand the location space of the cavern, and has a reasonable layout, so as to achieve the purpose of two-way transportation of blasting slag and sand and gravel aggregates in the construction of long-distance and large longitudinal slope tunnels, thereby improving the construction efficiency.

[0020] To sum up, the present invention has a simple structure and a reasonable design. The sand and gravel aggregate loading and transporting device, the two-way belt conveyor and the sand and gravel aggregate unloading and transporting device jointly realize the function of the lower belt of the two-way belt conveyor to carry materials back. The slag loading and transporting device, the two-way belt conveyor and the slag unloading and transporting device jointly realize the function of the upper belt of the two-way belt conveyor to discharge slag, thereby realizing the purpose of two-way transportation of blasting slag and sand and gravel aggregate in the construction of long-distance and large longitudinal slope tunnels, and can solve the technical problem of safe and efficient transportation of slag in the construction of long-distance and large longitudinal slope tunnels.

[0021] The present invention is further described in detail below through the accompanying drawings and examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the principle of the bidirectional belt conveyor transportation system of the present invention.

[0023] Figure 2 It is a structural schematic diagram of the present invention.

[0024] Description of reference numerals:

[0025] 1—bidirectional belt conveyor; 1-1—main drive motor; 1-2—hydraulic brake drum;

[0026] 2—belt conveyor with the largest inclination angle; 3—belt conveyor with the first horizontal angle; 4—belt conveyor with the second largest inclination angle;

[0027] 5—Second horizontal belt conveyor; 6—Third largest angle belt conveyor; 7—Mobile reversible belt conveyor;

[0028] 8—sand and gravel aggregate storage bin inside the cave; 9—sand and gravel aggregate storage bin outside the cave;

[0029] 10—sand and gravel aggregate loading hopper; 11—slag conveyor outside the tunnel; 12—unloading pool;

[0030] 13—cleaning box; 14—tensioning tower; 15—main hole;

[0031] 16—branch cave; 17—intersecting and enlarged cavern between the main cave and branch cave;

[0032] 18—Temporary storage hole for slag in the tunnel; 19—Traffic tunnel;

[0033] 20—In-tunnel mixing station. DETAILED DESCRIPTION

[0034] like Figure 1 and Figure 2 As shown, the present invention is a bidirectional belt conveyor transportation system for long-distance and steep longitudinal slope tunnel construction, comprising a bidirectional belt conveyor 1 arranged in a branch tunnel 16 for synchronously carrying out slag discharge and sand and gravel aggregate transportation during tunnel construction, a sand and gravel aggregate loading and transportation device and a slag material unloading and transportation device arranged outside the tunnel, and a sand and gravel aggregate unloading and transportation device and a slag material loading and transportation device arranged in an expanded cavern 17 crossing the main tunnel and the branch tunnel; the sand and gravel aggregate loading and transportation device comprises an outside-tunnel sand and gravel aggregate storage bin 9 arranged outside the tunnel, a sand and gravel aggregate loading hopper 10, a first high-angle belt conveyor 2 and a first horizontal belt conveyor 3 connected to the discharge end of the first high-angle belt conveyor 2, the discharge end of the first horizontal belt conveyor 3 being connected to the lower belt of the bidirectional belt conveyor 1; the sand and gravel aggregate unloading and transportation device comprises a A third steep-angle belt conveyor 6 connected to the discharge end of sand and gravel aggregates and a mobile reversible belt conveyor 7 connected to the third steep-angle belt conveyor 6, the discharge end of the mobile reversible belt conveyor 7 is provided with an in-tunnel sand and gravel aggregate storage bin 8; the slag loading and transportation device comprises an in-tunnel slag temporary storage hole 18, a slag loading hopper, a slag crusher, a second steep-angle belt conveyor 4 and a second horizontal belt conveyor 5 connected to the discharge end of the second steep-angle belt conveyor 4, the discharge end of the second horizontal belt conveyor 5 is connected to the upper belt of the bidirectional belt conveyor 1; the slag unloading and transportation device comprises an out-tunnel slag transfer belt conveyor 11 connected to the slag discharge end of the bidirectional belt conveyor 1 and a discharge pool 12 connected to the discharge end of the out-tunnel slag transfer belt conveyor 11, and an electrically controlled hydraulic brake roller mechanism is provided on the lower belt of the bidirectional belt conveyor 1.

[0035] In this embodiment, the main tunnel 15 and the branch tunnel 16 intersect to form a main tunnel and branch tunnel cross-expanded cavern 17, by setting a two-way belt conveyor 1 in the branch tunnel 15 for simultaneous slag discharge and sand and gravel aggregate transportation during tunnel construction, a sand and gravel aggregate loading and transportation device and a slag unloading and transportation device are set outside the tunnel, and a sand and gravel aggregate unloading and transportation device and a slag loading and transportation device are set in the main tunnel and branch tunnel cross-expanded cavern 17, the sand and gravel aggregate loading and transportation device, the two-way belt conveyor 1 and the sand and gravel aggregate unloading and transportation device jointly realize the function of the lower belt of the two-way belt conveyor 1 to carry materials in the return trip, and the slag loading and transportation device, the two-way belt conveyor 1 and the slag unloading and transportation device jointly realize the function of the upper belt of the two-way belt conveyor 1 to discharge slag.

[0036] In this embodiment, since the two-way belt conveyor 1 runs downhill when carrying out the slag on the return journey, the belt of the two-way belt conveyor 1 is in a fully loaded running state during the process of carrying out the slag on the return journey. Affected by inertia and gravity acceleration, the belt running speed will gradually increase. When the set speed is exceeded, the main drive motor 1-1 is in a power generation state. At this time, the traction force of the main drive motor 1-1 is a negative value, and the runaway phenomenon is very likely to occur when the machine is shut down. Therefore, in order to avoid the runaway phenomenon, an electrically-controlled hydraulic brake roller mechanism is provided on the lower belt of the two-way belt conveyor 1. During the operation of the two-way belt conveyor 1, the operating speed of the two-way belt conveyor 1 is adjusted by using the electrically-controlled hydraulic brake roller mechanism, which can solve the technical problem of safe and efficient transportation of slag in long-distance and large longitudinal slope tunnel construction. Compared with the traditional method of using a brake motor to brake the reducer drive shaft, the electrically-controlled hydraulic brake roller mechanism will not cause the upper belt to be tensioned and the lower belt to be relaxed, and can ensure the smooth operation of the two-way belt conveyor 1.

[0037] In this embodiment, a mobile reversible belt conveyor 7 and a sand and gravel aggregate storage bin 8 are arranged at the intersection section of the main and branch tunnels. The sand and gravel aggregate storage bin 8 is a steel structure aggregate bin. The mobile reversible belt conveyor 7 is arranged above the steel structure aggregate bin. The sand and gravel aggregates are transported to the third large-angle belt conveyor 6 by the lower belt of the two-way belt conveyor 1. After that, the sand and gravel aggregates are transmitted to the mobile reversible belt conveyor 7 through the third large-angle belt conveyor 6. The mobile reversible belt conveyor 7 can transport the sand and gravel aggregates to small stone bins, medium stone bins, bean stone bins or sand and gravel bins for storage, thereby realizing single transportation of different types of sand and gravel aggregates.

[0038] In this embodiment, the driving mechanism of the bidirectional belt conveyor 1 is arranged outside the tunnel, and the driving mechanism includes three main driving motors 1 - 1 , and the three main driving motors 1 - 1 are all controlled by a PLC controller and a frequency converter.

[0039] In this embodiment, an electrically controlled hydraulic brake roller mechanism is provided on the lower belt of the bidirectional belt conveyor 1, and the electrically controlled hydraulic brake roller mechanism includes multiple hydraulic brake rollers 1-2. The multiple hydraulic brake rollers 1-2 are all controlled by a microcontroller. A speed sensor is provided on the lower belt of the bidirectional belt conveyor 1, and the microcontroller and the speed sensor are both connected to the PLC controller.

[0040] In this embodiment, the number of the hydraulic brake rollers 1 - 2 is three.

[0041] In this embodiment, a tensioning tower 14 is provided on the upper belt of the bidirectional belt conveyor 1 , and a cleaning box 13 is provided on the lower belt of the bidirectional belt conveyor 1 .

[0042] In this embodiment, a traffic tunnel 19 connected to the main tunnel 15 is provided on one side of the branch tunnel 16, and an in-tunnel mixing station 20 is also provided in the cross-enlarged cavern 17 between the main tunnel and the branch tunnel. The in-tunnel mixing station 20 and the in-tunnel sand and gravel aggregate storage bin 8 are respectively arranged on both sides of the cross-enlarged cavern 17 between the main tunnel and the branch tunnel.

[0043] In this embodiment, the sand and gravel aggregate storage bin 9 outside the cave and the sand and gravel aggregate storage bin 8 inside the cave both include a small stone bin, a medium stone bin, a pea stone bin and a sand and gravel bin, and the sand and gravel aggregate storage bin 8 inside the cave is a steel structure storage bin.

[0044] The present invention also provides a method for bidirectional transportation of sandstone aggregate and slag in long-distance and steep-slope tunnel construction, the method comprising:

[0045] During the transportation of sand and gravel aggregates, the order in which the five belt conveyors are started is: mobile reversible belt conveyor 7, the third largest angle belt conveyor 6, the bidirectional belt conveyor 1, the first horizontal belt conveyor 3 and the first largest angle belt conveyor 2, and the order in which the five belt conveyors are stopped is: the first largest angle belt conveyor 2, the first horizontal belt conveyor 3, the bidirectional belt conveyor 1, the third largest angle belt conveyor 6 and the mobile reversible belt conveyor 7; wherein, the transportation process of sand and gravel aggregates is:

[0046] The gravel aggregate upper hopper 10 is used to transport the gravel aggregate in the gravel aggregate storage bin 9 outside the cave to the belt of the first large-angle belt conveyor 2. The gravel aggregate is sequentially transmitted to the lower belt of the two-way belt conveyor 1 through the first large-angle belt conveyor 2 and the first horizontal belt conveyor 3. The gravel aggregate is transported to the third large-angle belt conveyor 6 by the lower belt of the two-way belt conveyor 1. After that, the gravel aggregate is transmitted to the mobile reversible belt conveyor 7 through the third large-angle belt conveyor 6. The mobile reversible belt conveyor 7 transports the gravel aggregate to the small stone bin, the medium stone bin, the pea stone bin or the gravel bin for storage;

[0047] During the slag transportation process, the four belt conveyors are started in the following order: the outer tunnel slag transfer belt conveyor 11, the bidirectional belt conveyor 1, the second horizontal belt conveyor 5, and the second largest angle belt conveyor 4. The four belt conveyors are stopped in the following order: the second largest angle belt conveyor 4, the second horizontal belt conveyor 5, the bidirectional belt conveyor 1, and the outer tunnel slag transfer belt conveyor 11. The slag transportation process is as follows:

[0048] The slag in the temporary storage hole 18 in the tunnel is transported to the second large-angle belt conveyor 4 by means of the slag upper hopper and the slag crusher. The slag is sequentially transmitted to the upper belt of the bidirectional belt conveyor 1 through the second large-angle belt conveyor 4 and the second horizontal belt conveyor 5. The upper belt of the bidirectional belt conveyor 1 transports the sand and gravel aggregates to the slag transfer belt conveyor 11 outside the tunnel. The slag transfer belt conveyor 11 outside the tunnel transports the slag to the unloading pool 12.

[0049] In this embodiment, the control process of the bidirectional belt conveyor 1 during operation is as follows: the three main drive motors 1-1 are controlled by the PLC controller and the frequency converter to work simultaneously, driving the belt of the bidirectional belt conveyor 1 to run according to the set running speed of the belt. During the bidirectional operation of the bidirectional belt conveyor 1, the speed sensor transmits the actual running speed of the belt detected in real time to the PLC controller, and the PLC controller compares the actual running speed of the belt detected in real time with the set running speed of the belt. When the actual running speed of the belt exceeds the set running speed of the belt, the PLC controller transmits a control signal to the microcontroller, and the microcontroller controls the operation of multiple hydraulic brake rollers 1-2. At the same time, the frequency converter controls the speed of the three main drive motors 1-1 to reduce the traction force of the main drive motors 1-1 until the bidirectional belt conveyor 1 runs normally according to the set running speed of the belt. The value range of the set running speed of the belt is 1.8m / s to 2.5m / s.

[0050] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A bidirectional belt conveyor transport system for long-distance and high-slope tunnel construction, characterized by: The invention comprises a bidirectional belt conveyor (1) arranged in a branch tunnel (16) for synchronously discharging slag and transporting gravel aggregates during tunnel construction, a gravel aggregate loading and transporting device and a slag unloading and transporting device arranged outside the tunnel, and a gravel aggregate unloading and transporting device and a slag loading and transporting device arranged in an expanded cavern (17) where the main tunnel and the branch tunnel intersect; the gravel aggregate loading and transporting device comprises an external gravel aggregate storage bin (9) arranged outside the tunnel, a gravel aggregate loading hopper (10), a first high-angle belt conveyor (2), and a first horizontal belt conveyor (3) connected to the discharge end of the first high-angle belt conveyor (2), the discharge end of the first horizontal belt conveyor (3) being connected to the lower belt of the bidirectional belt conveyor (1); the gravel aggregate unloading and transporting device comprises a third high-angle belt conveyor (10) connected to the gravel aggregate discharge end of the bidirectional belt conveyor (1). 6) and a mobile reversible belt conveyor (7) connected to the third large-angle belt conveyor (6), the discharge end of the mobile reversible belt conveyor (7) is provided with an in-tunnel sand and gravel aggregate storage bin (8); the slag loading and transportation device comprises an in-tunnel slag temporary storage hole (18), a slag loading hopper, a slag crusher, a second large-angle belt conveyor (4) and a second horizontal belt conveyor (5) connected to the discharge end of the second large-angle belt conveyor (4), the discharge end of the second horizontal belt conveyor (5) is connected to the upper belt of the bidirectional belt conveyor (1); the slag unloading and transportation device comprises an out-tunnel slag transfer belt conveyor (11) connected to the slag discharge end of the bidirectional belt conveyor (1) and a discharge pool (12) connected to the discharge end of the out-tunnel slag transfer belt conveyor (11), and an electric-controlled hydraulic brake roller mechanism is provided on the lower belt of the bidirectional belt conveyor (1).

2. A bidirectional belt conveyor transportation system for long-distance and steep-slope tunnel construction according to claim 1, characterized in that: The driving mechanism of the bidirectional belt conveyor (1) is arranged outside the tunnel, and the driving mechanism comprises three main driving motors (1-1). The three main driving motors (1-1) are all controlled by a PLC controller and a frequency converter.

3. A bidirectional belt conveyor transportation system for long-distance and steep-slope tunnel construction according to claim 1, characterized in that: The electrically controlled hydraulic brake roller mechanism comprises a plurality of hydraulic brake rollers (1-2), each of which is controlled by a microcontroller. A speed sensor is provided on the lower belt of the bidirectional belt conveyor (1), and both the microcontroller and the speed sensor are connected to the PLC controller.

4. A bidirectional belt conveyor transportation system for long-distance and steep-slope tunnel construction according to claim 1, characterized in that: A tensioning tower (15) is arranged on the upper belt of the bidirectional belt conveyor (1), and a cleaning box (13) is arranged on the lower belt of the bidirectional belt conveyor (1).

5. A bidirectional belt conveyor transportation system for long-distance and steep-slope tunnel construction according to claim 1, characterized in that: The sand and gravel aggregate storage bin (9) outside the cave and the sand and gravel aggregate storage bin (8) inside the cave both include a small stone bin, a medium stone bin, a pea stone bin and a sand and gravel bin, and the sand and gravel aggregate storage bin (8) inside the cave is a steel structure storage bin.

6. A method for bidirectional transportation of sandstone aggregate and slag using the bidirectional belt conveyor transportation system for long-distance and steep longitudinal slope tunnel construction as claimed in claim 1, characterized in that: The method is: During the transportation of sand and gravel aggregates, the order in which the five belt conveyors are started is: the mobile reversible belt conveyor (7), the third largest angle belt conveyor (6), the bidirectional belt conveyor (1), the first horizontal belt conveyor (3) and the first largest angle belt conveyor (2); and the order in which the five belt conveyors are stopped is: the first largest angle belt conveyor (2), the first horizontal belt conveyor (3), the bidirectional belt conveyor (1), the third largest angle belt conveyor (6) and the mobile reversible belt conveyor (7); wherein, the transportation process of sand and gravel aggregates is as follows: The gravel aggregate in the gravel aggregate storage bin (9) outside the cave is transported to the belt of the first large-angle belt conveyor (2) by using the gravel aggregate upper hopper (10); the gravel aggregate is sequentially transported to the lower belt of the bidirectional belt conveyor (1) through the first large-angle belt conveyor (2) and the first horizontal belt conveyor (3); the gravel aggregate is transported to the third large-angle belt conveyor (6) by the lower belt of the bidirectional belt conveyor (1); thereafter, the gravel aggregate is transported to the mobile reversible belt conveyor (7) through the third large-angle belt conveyor (6); the mobile reversible belt conveyor (7) transports the gravel aggregate to the small stone bin, the medium stone bin, the pea stone bin or the gravel bin for storage; During the slag transportation process, the four belt conveyors are started in the following order: the slag transfer belt conveyor (11) outside the tunnel, the bidirectional belt conveyor (1), the second horizontal belt conveyor (5) and the second largest angle belt conveyor (4), and the four belt conveyors are stopped in the following order: the second largest angle belt conveyor (4), the second horizontal belt conveyor (5), the bidirectional belt conveyor (1) and the slag transfer belt conveyor (11) outside the tunnel; wherein, the slag transportation process is as follows: The slag in the temporary storage hole (18) in the tunnel is transported to the second large-angle belt conveyor (4) by means of a slag upper hopper and a slag crusher. The slag is sequentially transferred to the upper belt of the bidirectional belt conveyor (1) through the second large-angle belt conveyor (4) and the second horizontal belt conveyor (5). The upper belt of the bidirectional belt conveyor (1) transports the sand and gravel aggregate to the slag transfer belt conveyor (11) outside the tunnel. The slag transfer belt conveyor (11) outside the tunnel transports the slag to the unloading pool (12).

7. The method for bidirectional transportation of sandstone aggregate and slag according to claim 6, characterized in that: The control process of the bidirectional belt conveyor (1) during operation is as follows: the three main drive motors (1-1) are controlled by a PLC controller and a frequency converter to work simultaneously, driving the belt of the bidirectional belt conveyor (1) to run at a set belt running speed; during the bidirectional operation of the bidirectional belt conveyor (1), the speed sensor transmits the actual belt running speed detected in real time to the PLC controller; the PLC controller compares the actual belt running speed detected in real time with the set belt running speed; when the actual belt running speed exceeds the set belt running speed, the PLC controller transmits a control signal to the microcontroller, and the microcontroller controls the operation of multiple hydraulic brake rollers (1-2); at the same time, the frequency converter controls the rotation speed of the three main drive motors (1-1) to reduce the traction force of the main drive motors (1-1) until the bidirectional belt conveyor (1) runs normally at the set belt running speed; the value range of the set belt running speed is 1.8 m / s to 2.5 m / s.

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