CN113695061B

CN113695061B - Building rubbish breaker

Info

Publication number: CN113695061B
Application number: CN202111028128.5A
Authority: CN
Inventors: 张向辉
Original assignee: Harbin Vocational and Technical College
Current assignee: Harbin Vocational and Technical College
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2023-03-14
Anticipated expiration: 2041-09-02
Also published as: CN113695061A

Abstract

A construction waste crushing device comprises a voltage-stabilizing power supply, an electric belt conveyor, a hydraulic assembly, an electric construction waste crushing equipment body and a metal detector; the device is also provided with a control circuit, a wind power separating mechanism and an electric turning mechanism; the electric construction waste crushing equipment body is arranged at the rear tail end of the electric belt conveyor; the feed bin is installed to electronic belt conveyor's front end, the electronic mechanism that turns, wind-force separating mechanism, metal detector of turning of side installation behind the feed bin, the terminal both sides baffle of electronic belt conveyor has an opening respectively, hydraulic component's hydro-cylinder is installed in one of them baffle opening rear end, the silo is installed in another baffle opening outside, constant voltage power supply, control circuit install at quick-witted incasement and with electronic belt conveyor, electronic mechanism that turns, the solenoid valve at hydro-cylinder both ends, metal detector electric connection. The invention reduces the adverse effect of light impurities on the material quality and effectively prevents metal materials from entering the crushing bin.

Description

Building rubbish breaker

Technical Field

The invention relates to the technical field of crushing equipment, in particular to a building rubbish crushing device.

Background

The electric construction waste crushing equipment is a mechanism for crushing construction waste and then recycling the construction waste or facilitating transportation, for example, the construction waste is crushed and then used as a road surface or a landfill in a hollow area, or is proportionally added into construction materials (for example, the construction waste is used as an outdoor terrace material or as a bonding material between connecting bricks to replace part of sand or stones and the like) to be used as a resource. The main structure of the existing construction waste crushing equipment comprises a crushing bin, a motor, a crushing roller, a feeding bin and the like, when the equipment works, the construction waste to be crushed is thrown into the crushing bin through the feeding bin, the motor drives the crushing roller positioned in the crushing bin to rotate, and the construction waste is crushed and then discharged from a discharging bin at the lower end of the crushing bin.

In practical situations, the construction waste often contains paper, plastics and other light impurities, and if the materials are crushed together with the construction materials and then used as subsequent construction auxiliary materials, the subsequent construction quality is affected (for example, the terrace is cracked due to insufficient adhesion) because the paper, the plastics and the other light impurities have low strength and insufficient adhesion. Therefore, in order to reduce the influence of the materials on the building materials after subsequent crushing as much as possible, workers need to sort out foreign matters in the building garbage as much as possible; manual operation not only wastes time and energy, but also the construction waste is often piled up highly, and the volume of getting into the feed bin of rubbing crusher at every turn is great, therefore the effect of manual mode clearance is limited. In addition, metal foreign matters are often left in the construction waste, and after the foreign matters enter the crushing bin, the crushing rollers and the like are damaged, the load of the motor is increased, and the motor is possibly damaged. In summary, it is necessary to provide a construction waste crushing device capable of separating foreign matters in construction waste as much as possible.

Disclosure of Invention

The invention provides a construction waste crushing device which is based on an electric construction waste crushing device body, can separate paper, plastics and other light impurities in construction waste as far as possible under the combined action of related mechanisms and circuits in application, and can effectively prevent the metal materials in the construction waste from entering a crushing bin to cause damage to related parts of the construction waste crushing device body.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a construction waste crushing device comprises a voltage-stabilized power supply, an electric belt conveyor, a hydraulic assembly, an electric construction waste crushing equipment body and a metal detector; it is characterized by also comprising a control circuit, a wind power separation mechanism and an electric turning mechanism; the electric construction waste crushing equipment body is arranged at the rear tail end of the electric belt conveyor; the front end of the electric belt conveyor is provided with a bin, and the rear end of the bin is provided with an electric turning mechanism; the wind power separation mechanism comprises a fan and an air inlet bin, an air pipe is mounted at the upper end of the air inlet bin, two branch pipes are mounted at the upper part of the air pipe, an axial flow fan is mounted on the outer side of the air pipe, an air outlet pipe of the axial flow fan is connected with one branch pipe, the other branch pipe is connected with a cloth bag through a pipeline, and the air inlet bin is mounted at the rear side end of the electric turning mechanism; the metal detector is arranged at the rear side end of the wind power separation mechanism, two side baffles at the tail end of the electric belt conveyor are respectively provided with an opening, an oil cylinder of the hydraulic assembly is arranged at the rear end of the opening of one baffle, a material groove is arranged outside the opening of the other baffle, and the stabilized voltage supply and the control circuit are arranged in the case; the two control power supply output ends of the control circuit are respectively and electrically connected with the power supply input ends of the electric belt conveyor and the electric turning mechanism; the output end of the trigger power supply of the control circuit is electrically connected with the electromagnetic valves at two ends of the cylinder barrel of the oil cylinder respectively; and the signal output ends of the two metal detectors are electrically connected with the signal input end of the control circuit.

Further, the metal detector is a PNP type inductive metal detector.

Furthermore, the control circuit comprises a time relay module, relays and time control switches which are electrically connected, the power output end of the time relay module is connected with the positive power input ends of the two sets of time control switches and the positive power input ends of the two relays, and the negative power input end and the negative trigger power input end of the time relay module are connected with the negative power input ends of the two relays and the negative power input ends of the two sets of time control switches.

Furthermore, the electric turning mechanism comprises a motor gear reducer and a rotating plate, the rotating plate is mounted with a power output shaft of the motor gear reducer, the motor gear reducer is mounted on one side of a baffle of the electric belt conveyor, the rotating plate is rotatably mounted on the other side of the baffle of the electric belt conveyor, and the lower end of the rotating plate is spaced from the upper end of the conveying belt.

Furthermore, the openings of the baffle plates at the left and right positions of the tail end of the electric belt conveyor are in a straight line, the oil cylinder is installed at the rear end of one opening, the front end of a piston rod of the oil cylinder is provided with a push plate, the push plate is located in the opening of one baffle plate, and the upper part of the other opening is of an open structure.

The invention has the beneficial effects that: according to the invention, based on the electric construction waste crushing equipment body, in application, a worker only needs to put construction waste into the bin, the construction waste can be conveyed to the tail end through the conveying belt of the electric belt conveyor, the construction waste on the conveying belt can be spread on the conveying belt as far as possible by the rotating plate of the electric turning mechanism in the conveying process, then the wind power separation mechanism generates negative pressure suction force, light impurities such as paper, plastics and the like in the construction waste on the conveying belt can be extracted as far as possible to prevent the light impurities from entering the construction waste crushing equipment body, and adverse effects of the impurities on the construction waste serving as construction auxiliary materials in the follow-up process are reduced as far as possible. According to the invention, when metal and metal detectors in the construction waste can effectively detect the metal and metal, and further part of the waste containing metal foreign matters can be pushed out of the conveying belt under the action of the related mechanism, so that the metal material in the construction waste is effectively prevented from entering the crushing bin to cause damage to related parts of the construction waste crushing equipment body. Based on the above, the invention has good application prospect.

Drawings

The invention is further illustrated below with reference to the figures and examples.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a partial structural schematic diagram of the present invention.

Fig. 3 is a circuit diagram of the present invention.

Detailed Description

As shown in fig. 1, 2 and 3, the construction waste crushing device comprises a regulated power supply A1, an electric belt conveyor M with baffles 102 at the left and right side ends of a frame 101, a hydraulic assembly with a hydraulic oil pump (not shown) and an oil cylinder 2, an electric construction waste crushing equipment body 3 and a metal detector A2N; the device is also provided with a control circuit 4, a wind power separation mechanism and an electric turning mechanism; the electric construction waste crushing equipment body 3 is arranged at the rear tail end of a transversely-distributed electric belt conveyor M, and the upper end of a feeding bin 31 of the electric construction waste crushing equipment body 3 is positioned at the lower part of the rear tail end of a conveying belt 103 of the electric belt conveyor M; the left baffle plate and the right baffle plate 102 at the front end of the electric belt conveyor M are provided with a conical bin 5 with a large upper end and a small lower end which are in an open structure through screw nuts, and an electric turning mechanism is arranged between the left baffle plate and the right baffle plate 102 at the middle part of the electric belt conveyor M close to the front position; the wind power separation mechanism comprises an axial flow fan 66, a conical air inlet bin 62 with an open lower end and a closed upper end, the middle part of the upper end of the air inlet bin 62 is vertically welded with an air pipe 63 communicated with the inside of the air inlet bin, the upper part of the air pipe 63 is in a closed structure, the front side end and the rear side end of the upper end of the air pipe 63 are respectively welded with a branch pipe 64 communicated with the inside of the air pipe, a motor of the axial flow fan 66 is arranged at the upper end of the rear outer side of the air pipe 63 through a support frame by a screw nut, a flange of an air outlet pipe 61 and a flange of the rear branch pipe 64 of the axial flow fan 66 are connected together by the screw nut, the front branch pipe 64 is connected with a hose 65, the other end of the hose 65 is sleeved with the upper end of a cloth bag 67 with a plurality of micropores on the surface (the entered air can be effectively discharged in time), and the lower end of the air inlet bin 62 is distributed and arranged on a left baffle plate 102 and a right baffle plate positioned at the rear side end of the electric turning mechanism; two sets of metal detectors A2N are arranged below a nonmetal connecting plate 7 (engineering plastic) at a certain distance from left to right, and the left end and the right end of the connecting plate 7 are arranged on a left baffle plate 102 and a right baffle plate 102 which are positioned at the rear side end of the wind power separation mechanism; the baffle 102 at the left and right positions of the tail end of the electric belt conveyor is respectively provided with a

rectangular opening

104 and 105, a hydraulic oil pump is installed in a case at the lower end of a rack 101 of the electric belt conveyor, an oil cylinder 2 is installed at the rear end of the baffle opening 104 at the right end, a U-shaped material groove 106 with the right high and the left low is installed at the outer side of the baffle opening 105 at the left end through a screw nut, and a supporting plate 107 is installed between the lower part of the left front end of the material groove 106 and the lower end of the rack; the stabilized voltage supply A1 and the control circuit 4 are installed on a circuit board in the case 101. Electromagnetic valve DC, DC1 oil inlet and return pipeline joints at two sides of the hydraulic oil cylinder and hydraulic oil inlet and return pipeline interfaces of the hydraulic oil pump are respectively connected in parallel through hydraulic oil pipes.

As shown in fig. 1, 2 and 3, the regulated power supply A1 is a finished product of a 220V/24V/1KW switching power supply module converting alternating current 220V into direct current 24V; the metal detector A2N is a good-faith brand model DC24V/PNP type induction type metal detector finished product, and is provided with three conducting wires, two power connections and the other signal output wire, the farthest detection distance is 210mm, when the metal detector A2N is applied to the invention, because the conveying belt 103 is made of rubber materials and the connecting plate 7 is made of non-metal materials, the detection range of the two metal detectors A2N (the distance between the metal detectors A2N and the baffles on the left side and the right side is just larger than 210 mm) can just cover the range between the left side end and the right side end of the conveying belt 103. The control circuit comprises a time relay module A5, relays K and K1 and time control switches A3 and A4 which are connected through circuit board wiring, wherein a power output end pin 9 of the time relay module A5 is connected with a positive power input end pin 1 of the two sets of time control switches A3 and A4 and positive power input ends of the two relays K and K1, and a negative power input end pin 2 and a negative trigger power input end pin 4 of the time relay module A5 are connected with negative power input ends of the two relays K and K1 and negative power input ends of the two sets of time control switches A3 and A4. The motor of the wind power separating mechanism has the working voltage of 380V and the power of 2KW, when the wind power separating mechanism works, the motor drives the impeller in the volute to rotate, air outside the air inlet pipe of the volute is sucked in and then discharged through the air outlet pipe 61, and the two branch pipes are in a horizontal straight line. The electric turning mechanism comprises a 380V/2.5KW coaxial motor gear reducer finished product M1 (the rotating speed of a power output shaft of the rotary plate is 30 revolutions per minute), a metal cross-shaped rotary plate 81, the middle part of the right rear end of the rotary plate 81 is welded with the left front end of the power output shaft of the motor gear reducer finished product M1, the right rear end of a shell of the motor gear reducer finished product M1 is installed at the upper right part of a baffle plate 102 close to the front position in the middle of an electric belt conveyor through a screw nut, a bearing seat 82 is installed at the upper left part of the baffle plate 102 at the left end, a shaft rod at the left front end of the rotary plate 81 is tightly sleeved in a bearing inner ring of the bearing seat 82, and the lower end of the rotary plate 81 is spaced from the upper end of a conveying belt by a certain distance and the distance is larger than the height of single construction waste to be crushed. The

rectangular openings

104 and 105 of the baffle plates at the left and right positions of the tail end of the electric belt conveyor are in a straight line left and right, the oil cylinder 2 is installed on a supporting plate 107 at the rear end of the baffle plate opening 104 at the right end, a push plate 108 is arranged at the left front end of a piston rod of the oil cylinder 2, the push plate 108 is positioned in the baffle plate opening 104 at the right end, the length and width of the push plate 108 are smaller than the length and width of the opening at the left end and the right end by 2 millimeters, and the upper part of the opening 105 at the left end is of an open structure (the lower end of the opening at the left end and the right end is lower than the height of the conveying belt 103).

As shown in fig. 1, 2 and 3,

pins

1 and 2 of a power input end of a regulated power supply A1 and two poles of an alternating current 220V power supply are respectively connected through leads.

Pins

3 and 4 of a power output end of the voltage-stabilized power supply A1,

pins

1 and 2 of a power input end time relay module A5 of the control circuit and

pins

1 and 2 of power input ends of two metal detectors A2N are respectively connected through leads. The input ends of three control power supplies of a relay K and a relay K1 of the control circuit are connected with an alternating current 380V power supply through leads. Three normally closed contact ends of two control power output ends of the control circuit, namely a relay K and a relay K1, are respectively connected with the power input ends of a motor reducing mechanism M1 (a coaxial motor gear reducer finished product M1) of the electric belt conveyor M and the electric turning mechanism through leads. The

pins

3 and 4 of the time control switches A4 and A3 at the trigger power supply output end of the control circuit and the two power input ends of the two electromagnetic valves DC and DC1 at the two ends of the cylinder barrel of the oil cylinder are respectively connected through wires. The axial flow fan 66 and the power input end of the electric construction waste crushing equipment body 3 are respectively connected in series with a 380V alternating current power supply through a power switch and a wire. Pins 3 of signal output ends of the two metal detectors A2N are connected with pins 3 of a time relay module A5 of a signal input end of a control circuit through leads.

As shown in fig. 1, 2, and 3, after the 220V ac power supply enters the power input terminal of the regulated power supply A1,

pins

3 and 4 of the regulated power supply A1 will output a stable 24V dc power supply to enter the power input terminals of the two metal detectors A2N and the control circuit. In the invention, the axial flow fan 66 and the power switch of the electric construction waste crushing equipment body 3 (and the power switch of the hydraulic component) are turned on before use, so that the axial flow fan 66 and the electric construction waste crushing equipment body 3 are in an electrified working state. Based on the electric construction waste crushing equipment body 3, in application, workers only need to put construction waste into the bin 5 and do no operation. In the initial state, the relays K and K1 are powered off, and the control power input end and the normally closed contact end are closed, so that the electric belt conveyor M and the electric turning mechanism are in the powered working state. Building rubbish drops into the back, can get into on the conveyer belt 103 through feed bin 5 lower extreme, and building rubbish can be carried to the end through the conveyer belt 103 of electronic belt conveyor, and the building on the conveyer belt 103 can be shakeout as far as possible to the rotor plate 81 of electronic mechanism of turning during the transport (the motor reduction gears of electronic mechanism of turning drives the rotor plate and rotates), and light debris such as paper, plastics in the building rubbish can be shakeout as far as possible and lie in on conveyer belt 103. After the wind power separating mechanism works by electrifying, air sucked by the axial flow fan 66 and discharged at a high flow rate enters the cloth bag 67 through the two branch pipes 64 and the hose 65 and is blown out from a plurality of micropores on the surface of the cloth bag 67, so that negative pressure suction is generated at the lower ends in the air outlet pipe 61 and the air inlet bin 62, light impurities such as paper, plastics and the like on the conveying belt enter the cloth bag 67 through the air outlet pipe 61 and the hose 65 (which have certain strength and can keep a round shape) under strong negative pressure acting force, the light impurities are intercepted inside the cloth bag 67 (small amount of small particles such as fine soil, construction waste and the like exist in the cloth bag, the work is not influenced, and the cloth bag can be opened to uniformly clear after a large amount of light impurities such as paper, plastics and the like in the subsequent cloth bag. Through the above, the invention can draw out light impurities such as paper, plastics and the like in the construction waste on the conveyor belt as much as possible to prevent the light impurities from entering the construction waste crushing equipment body, and reduces adverse effects of the impurities on the construction waste serving as a construction auxiliary material as much as possible.

As shown in fig. 1, 2, and 3, when there is metal in the construction waste conveyed backward by the conveyor belt, after any one of the metal detectors A2N detects that it has 3 pins, it will output high level to enter the 3 pins of the positive electrode trigger signal input terminal of the time relay module A5, after the time relay module A5 inputs the positive electrode trigger signal, under the action of its internal circuit and 9 pins output power time set by the technician, it will output a period of time power at certain intervals (for example, output 10 seconds at intervals of 2 seconds, and guarantee that the waste containing metal just moves to the front of the left end of the push plate 108 within 2 seconds) to enter the positive electrode power input terminals of the relays K and K1 and the time control switches A4 and A3, so the relays K and K1 and the time control switches A4 and A3 are in an electric working state. After the relays K and K1 are electrified and attracted, the control power supply input end and the normally closed contact end are opened, so that the electric belt conveyor M and the electric turning mechanism M1 can be in a power-off state within 10 seconds, and preparation is made for pushing out the construction waste containing metal. After the time control switch A4 works by electrifying,

pins

3 and 4 of the time control switch A can output 5 seconds of power to enter a DC power input end of an electromagnetic valve at the right rear end of a cylinder body of the oil cylinder 2 under the action of an internal circuit and output power time set by a technician, then, an electrifying valve core of the electromagnetic valve DC is opened, high-pressure hydraulic oil output by the hydraulic oil pump enters the right rear end of the cylinder body of the oil cylinder 2 through a DC oil inlet pipe of the electromagnetic valve (the hydraulic oil at the left front end in the cylinder body flows back into the oil pump through an oil outlet pipe of the electromagnetic valve DC 1), a piston rod of the oil cylinder 2 moves leftwards and pushes construction waste containing metal objects out of a conveying belt through a left end opening 105 through a push plate 108, and the construction waste falls into a grinding bin or a material frame on the ground through a material groove 106 which is higher at the right and lower left, and the metal materials in the construction waste are effectively prevented from entering the grinding bin and causing damage to relevant parts of a construction waste crushing equipment body. After time switch A3 got electric work, its 3, 4 feet under the output power supply time effect that internal circuit and technical staff set for, can 5 seconds of interval output 5 seconds power gets into the solenoid valve DC1 power input end of the barrel left front end of hydro-cylinder 2, then, solenoid valve DC1 gets electric case and opens, hydraulic oil that hydraulic oil pump output like this can get into left front end in the hydro-cylinder 2 barrel through solenoid valve DC1 oil inlet pipe (right rear end hydraulic oil flows back into the oil pump via solenoid valve DC's oil extraction pipe in the barrel), the piston rod of hydro-cylinder 2 moves right and drives push pedal 108 and gets back to initial position, be located right-hand member opening 104, make preparation for propelling movement the building rubbish that has the metal next time. After 10 seconds, the 9 feet of the time relay module A5 stop outputting power, the relays K and K1, the time control switches A4 and A3 are all in a power-off state (when the building garbage has metal objects next time, the 3 feet of the two metal detectors A2N can output high level, further the relays K and K1 and the time control switches A4 and A3 can be powered on to work for 10 seconds, the process is continuously circulated, and then the metal foreign objects can be effectively prevented from entering the feeding bin 31), then, the electric belt conveyor M and the electric turning mechanism M1 are in the power-on working state again, the building garbage on the conveying belt can be conveyed into the feeding bin 31 of the building garbage crushing device body 3, the motor of the building garbage crushing device body 3 drives the crushing roller in the crushing bin 32 to rotate, further the building garbage is crushed and then discharged from the discharging bin 33 at the lower end of the crushing bin, and the whole working process is completed. It should be noted that the invention cannot prevent light impurities such as paper, plastics and the like from entering the construction waste crushing device body 3 (for example, the light impurities are spread on the conveyor belt but pressed by construction waste on a few parts of the lower end), but compared with the existing manual mode, the invention has the disadvantages of time and labor waste, great progress in the manual mode when the building waste is high in stacking height and enters the feeding bin of the crusher each time, and limited cleaning effect, and the cleaning effect is relatively more effective. In the circuit, relays K and K1 are relays with the model DC 24V; the time relay module A5 is a time controller module finished product of type YYC-2S, the working voltage of the time controller module finished product is direct current 24V, the time controller module finished product A5 is provided with a digital LED tube with a four-digit time display, two

power input ends

1 and 2 pins, two trigger

signal input ends

3 and 4 pins, a setting key 5 pin, an emergency stop key 6 pin, a time adding key 7 pin, a time reducing key 8 pin and a normally open power output end 9 pin, after the power input ends of positive and negative poles of the time controller module finished product A5 are electrified, an operator presses the setting key, the time adding key and the time reducing key are respectively operated through the digital display of the digital tube, the normally open power output end can output a positive power supply in a required time period, after the set time period passes, the normally open power output end stops outputting the power supply, the maximum set time is 9999 minutes, after the time controller module finished product is set, as long as the next time setting is not carried out, the internal set data can not be changed after the power is cut off, the time setting, the two trigger signal input ends are input into the finished product, and the time of the time controller module is timed. The time control switches A4 and A3 are full-automatic microcomputer time control switch finished products of model KG316T, the microcomputer time control switch is provided with a display screen, seven keys of canceling/recovering, time correcting, week correcting, automatic/manual, timing and clock, and is provided with two

power input ends

1, 2 pins and two

power output ends

3, 4 pins, a user respectively presses and operates the seven keys, the interval time of the two power output ends for outputting power and the time of outputting power each time can be set, and the power failure can not cause the change of the set power output time as long as the next key operation setting is not carried out after one time setting.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, the embodiments do not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A construction waste crushing device comprises a voltage-stabilizing power supply, an electric belt conveyor, a hydraulic assembly, an electric construction waste crushing equipment body and a metal detector; it is characterized by also comprising a control circuit, a wind power separation mechanism and an electric turning mechanism; the electric construction waste crushing equipment body is arranged at the rear tail end of the electric belt conveyor; a storage bin is arranged at the front end of the electric belt conveyor, and an electric turning mechanism is arranged at the rear end of the storage bin; the wind power separation mechanism comprises a fan and an air inlet bin, an air pipe is mounted at the upper end of the air inlet bin, two branch pipes are mounted at the upper part of the air pipe, an axial flow fan is mounted on the outer side of the air pipe, an air outlet pipe of the axial flow fan is connected with one branch pipe, the other branch pipe is connected with a cloth bag through a hose, and the air inlet bin is mounted at the rear end of the electric turning mechanism; the metal detector is arranged at the rear side end of the wind power separating mechanism, two side baffles at the tail end of the electric belt conveyor are respectively provided with an opening, an oil cylinder of the hydraulic assembly is arranged at the rear end of the opening of one baffle, a trough is arranged outside the opening of the other baffle, and the stabilized voltage supply and the control circuit are arranged in the case; the two control power supply output ends of the control circuit are respectively and electrically connected with the power supply input ends of the electric belt conveyor and the electric turning mechanism; the output end of the trigger power supply of the control circuit is electrically connected with the electromagnetic valves at two ends of the cylinder barrel of the oil cylinder respectively; the signal output ends of the two metal detectors are electrically connected with the signal input end of the control circuit; the metal detector is a PNP type induction type metal detector; the control circuit comprises a time relay module, relays and time control switches which are electrically connected, wherein the power output end of the time relay module is connected with the positive power input ends of the two sets of time control switches and the positive power input ends of the two relays, and the negative power input end and the negative trigger power input end of the time relay module are connected with the negative power input ends of the two relays and the negative power input ends of the two sets of time control switches; the electric turning mechanism comprises a motor gear reducer and a rotating plate, the rotating plate and a power output shaft of the motor gear reducer are installed together, the motor gear reducer is installed on one side of a baffle of the electric belt conveyor, the rotating plate is installed on the other side of the baffle of the electric belt conveyor in a rotating mode, and the lower end of the rotating plate is arranged at the upper end of the conveying belt and provided with a gap; the openings of the baffle plates at the left and right positions of the tail end of the electric belt conveyor are in a straight line, the oil cylinder is installed at the rear end of one opening, the front end of a piston rod of the oil cylinder is provided with the push plate, the push plate is positioned in the opening of one baffle plate, and the upper part of the other opening is of an open structure.