Automatic saw cutting device and method for nuclear decommissioned plate

Abstract

The invention discloses an automatic sawing device and method for nuclear decommissioning plates, and relates to nuclear decommissioning related equipment. An automatic sawing device for nuclear decommissioned plates comprises a sawing machine. The sawing machine comprises a bearing mechanism. A bearing surface capable of vertically lifting and / or horizontally rotating is arranged at the upper end of the bearing mechanism; the automatic plate feeding device further comprises a front chain scraper conveyor, a rear chain scraper conveyor, an upper pressing device, a lateral clamping device and a plate pushing-out device. The upper end of the front chain scraper conveyor is provided with an incoming material conveying face, and the upper end of the rear chain scraper conveyor is provided with a discharging conveying face. The automatic cutting method for the nuclear decommissioned plates is based on the automatic sawing device for the nuclear decommissioned plates and comprises the following steps that feeding is conducted; performing separation; adjusting the posture; performing cutting; discharging is conducted; and resetting. The automatic cutting device is used for automatic cutting of nuclear decommissioning plates, input strip-shaped plates can be cut for multiple times, small-size plates meeting the barreling requirement are obtained, the labor intensity of operators is reduced, and the operators are prevented from being radiated during cutting operation.

Description

Technical Field

[0001] The present invention relates to equipment related to nuclear decommissioning, in particular to an automatic sawing device and method for nuclear decommissioning plates. Background Art

[0002] Currently, during the nuclear decommissioning process, some plates that have been initially disassembled usually undergo multiple cuts to form square blanks of 400×400 (mm). Then, multiple square blanks are loaded into barrels with radiation shielding performance, and finally, a die-casting machine is used to flatten the barrels and bury them underground.

[0003] For the above-mentioned multiple cuts, first, the plate is cut into strip-shaped plates with a width of about 800 mm, and then through subsequent multiple cuts, the blank size that can be directly loaded into the barrel is achieved, that is, 400×400 (mm). Currently, the first cut usually adopts laser cutting, which does not require manual attendance. Subsequent multiple cuts usually adopt sawing machine cutting, which requires manual loading, unloading, and adjusting the direction of the blank on the workbench. The labor intensity of the operator is high, and there is a radiation risk. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an automatic sawing device and method for nuclear decommissioning plates, which solves the problems of low automation level, high labor intensity of operators, and radiation risk in the cutting process of existing nuclear decommissioning plates.

[0005] The technical solution of the present invention is: an automatic sawing device for nuclear decommissioning plates, including a sawing machine; the sawing machine includes a bearing mechanism; a bearing surface for vertical lifting and / or horizontal rotation is provided at the upper end of the bearing mechanism; The automatic sawing device for nuclear decommissioning plates further includes a front chain conveyor, a rear chain conveyor, an upper pressing device, a lateral clamping device, and a plate pushing device; a feeding conveying surface is provided at the upper end of the front chain conveyor, a discharging conveying surface is provided at the upper end of the rear chain conveyor, and the feeding conveying surface - bearing surface - discharging conveying surface are connected in sequence to form a conveying path for nuclear decommissioning plates; the upper pressing device is arranged directly above the bearing surface and is used to press the nuclear decommissioning plates against the bearing surface in the vertical direction; two sets of lateral clamping devices are symmetrically arranged on both sides of the feeding conveying surface and are used to clamp the two sides of the nuclear decommissioning plates in the horizontal direction; the plate pushing device is used to push the nuclear decommissioning plates on the bearing surface onto the discharging conveying surface.

[0006] A further technical solution of the present invention is as follows: The sawing machine further includes a gantry, a saw blade mechanism, and a lifting mechanism; the gantry is fixedly installed on the ground, and there is a notch A below the middle thereof; the saw blade mechanism is installed on the gantry, and it includes a driving wheel, a driven wheel, a saw blade, a guide frame, and a motor; the driving wheel and the driven wheel are arranged at the same height and are respectively rotatably installed on the gantry and are located on both sides of the notch A; two guide frames are respectively installed at the upper end of the middle of the gantry and extend downward, and each of the two guide frames is provided with a guide hole for the saw blade to pass through at the lower end; the saw blade is tensioned and wound between the driving wheel and the driven wheel to form two parallel horizontal sections up and down, and the horizontal section at the lower end respectively passes through the guide holes of the two guide frames, so as to form a working section between the two guide holes, the working section is located in the notch A of the gantry, the extending direction of the saw blade in the working section is horizontal, and the arrangement angle of the saw blade in the working section is vertical; the motor is fixedly installed on the gantry and is associated with the driving wheel to drive the driving wheel to rotate; the lifting mechanism is installed on the ground and is connected to the gantry to drive the gantry and the saw blade mechanism to vertically lift and lower; the bearing surface of the bearing mechanism is located directly below the working section of the saw blade.

[0007] A further technical solution of the present invention is as follows: The bearing mechanism includes an L-shaped plate and a lifting and rotating assembly; the L-shaped plate includes a horizontal plate and a vertical plate that are perpendicular to each other and fixedly connected, the upper surface of the horizontal plate is the bearing surface, and the bearing surface is provided with longitudinal grooves and transverse grooves arranged in a crosswise manner, and both ends of the longitudinal grooves and the transverse grooves communicate to the edge of the bearing surface, and the middle of the vertical plate is provided with an avoidance notch for the saw blade to lift and move, the avoidance notch extends downward from the upper edge of the vertical plate, and the avoidance notch communicates to the transverse groove of the horizontal plate at the lower end; the lifting and rotating assembly includes a jacking hydraulic cylinder and a rotating hydraulic cylinder; the jacking hydraulic cylinder is fixedly installed on the ground, the rotating hydraulic cylinder is connected to the upper end of the jacking hydraulic cylinder, and the output shaft of the rotating hydraulic cylinder is fixedly connected to the lower end surface of the horizontal plate, and the connection part is directly below the intersection of the longitudinal groove and the transverse groove of the horizontal plate.

[0008] A further technical solution of the present invention is as follows: The upper pressing device includes an n-shaped bracket, a cylinder A, and a pressing plate; the n-shaped bracket includes two vertically arranged legs and a cross beam connected to the upper ends of the two legs, and there is a communicating notch B on the cross beam and the two legs; the n-shaped bracket is arranged in the notch A of the gantry, the two legs are distributed on both sides of the L-shaped plate and are fixedly installed on the ground, and the cross beam is located directly above the L-shaped plate; two cylinder As are respectively fixedly installed on both sides of the notch B in the middle of the cross beam, the piston rods of the two cylinder As both extend vertically downward, two pressing plates are respectively fixedly connected to the ends of the piston rods of the two cylinder As, and the two pressing plates respectively make vertical lifting and lowering movements under the drive of the corresponding cylinder A.

[0009] A further technical solution of the present invention is as follows: The sheet pushing device includes a pushing hydraulic cylinder and a pushing plate; the two pushing hydraulic cylinders are respectively fixedly installed on both sides of the avoidance notch on the outer surface of the vertical plate, and the piston rods of the two hydraulic pushing cylinders respectively pass through the vertical plate and extend to one side of the inner surface of the vertical plate; the two pushing plates are respectively fixedly connected to the piston rods of the hydraulic pushing cylinders and are located on one side of the inner surface of the vertical plate, and the two pushing plates are respectively used for pushing out the nuclear decommissioning sheets on both sides of the transverse groove on the horizontal plate.

[0010] A further technical solution of the present invention is as follows: The L-shaped plate is driven by the lifting and rotating assembly to perform vertical lifting motion, so as to switch between the low position and the high position. When the L-shaped plate is in the low position, the bearing surface is flush with the incoming material conveying surface and the discharging material conveying surface. When the L-shaped plate is in the high position, the whole L-shaped plate exceeds the height of the incoming material conveying surface and the discharging material conveying surface; the L-shaped plate is driven by the lifting and rotating assembly to perform horizontal rotating motion, so as to switch between the first posture and the second posture; when the L-shaped plate is in the first posture, the vertical plate is located on one side of the nuclear decommissioning sheet conveying path, and there is no occlusion between the bearing surface and the incoming material conveying surface and the discharging material conveying surface. The avoidance notch in the middle of the vertical plate is used to accommodate the space required for the lifting and moving of the working section of the saw blade. The transverse groove on the horizontal plate is located directly below the working section of the saw blade, and the vertically downward projection area of the pressing plate is located on both sides of the transverse groove; when the L-shaped plate is in the second posture, the vertical plate is located between the bearing surface and the incoming material conveying surface, so as to form a partition between the bearing surface and the incoming material conveying surface, and there is no occlusion between the bearing surface and the discharging material conveying surface. The longitudinal groove on the horizontal plate is located directly below the working section of the saw blade, and the vertically downward projection area of the pressing plate is located on both sides of the longitudinal groove.

[0011] A further technical solution of the present invention is as follows: The side clamping device includes a lower bracket, a cylinder B and a clamping plate; the lower bracket is fixedly installed on the ground on one side of the front chain conveyor, the cylinder B is fixedly installed on the lower bracket, its piston rod extends horizontally and is perpendicular to the conveying direction of the incoming material conveying surface, and the clamping plate is fixedly installed on the end of the piston rod of the cylinder B and is located on the upper side at the rear end of the conveying direction of the incoming material conveying surface; the clamping plates of the two sets of side clamping devices are arranged facing each other.

[0012] A further technical solution of the present invention is as follows: The rear edge of the conveying direction of the front chain conveyor is flush with and adjacent to one side edge of the horizontal plate of the L-shaped plate in the low position and the first posture, and the front edge of the conveying direction of the rear chain conveyor is flush with and adjacent to the other side edge of the horizontal plate of the L-shaped plate in the low position and the first posture.

[0013] The technical solution of the present invention is: A method for automatically cutting nuclear decommissioning sheets, based on an automatic sawing device for nuclear decommissioning sheets. Before performing the method, the automatic sawing device for nuclear decommissioning sheets is in the initial state; In the initial state: Ⅰ. The lifting mechanism drives the gantry and the saw blade mechanism to rise to the highest point of the stroke; Ⅱ. The lifting and rotating assembly drives the L-shaped plate to descend to a low position and rotate to the first posture, so that the two side edges of the bearing surface are respectively connected to the incoming material conveying surface and the blanking conveying surface; Ⅲ. The piston rods of the two cylinders A are both in the retracted state, so that the pressing plate is in the highest position; Ⅳ. The piston rods of the two cylinders B are both in the retracted state, so that the two clamping plates are farthest apart and do not contact the nuclear decommissioning plates on the incoming material conveying surface; Ⅴ. The piston rod of the pusher hydraulic cylinder is in the retracted state, so as to avoid interfering with the nuclear decommissioning plates entering the bearing surface from the incoming material conveying surface; The method is as follows: S01, Loading: A. Draw disconnection lines: Intermittently draw disconnection lines along the length direction on the strip-shaped plate to be cut, and the disconnection lines are parallel to the width direction of the strip-shaped plate; Place the strip-shaped plate pre-cut into a specific width on the incoming material conveying surface; B. Perform loading: Start the front chain conveyor, and the strip-shaped plate is driven by the front chain conveyor to move towards the bearing surface. When the first disconnection line at the front end of the strip-shaped plate reaches directly below the saw blade, the front chain conveyor stops running; At this time, the front end of the strip-shaped plate does not enter the blanking conveying surface; S02, Disconnection: A. Press the upper end: The piston rods of the two cylinders A extend synchronously, driving the two pressing plates to move downward until they finally press tightly on the upper end of the strip-shaped plate at the same time; B. Press the two sides: The piston rods of the two cylinders B extend synchronously, driving the two clamping plates to move towards each other, and simultaneously contacting and clamping the two sides of the strip-shaped plate; C. Perform cutting: Start the motor to drive the saw blade to rotate; Start the lifting mechanism to drive the gantry and the saw blade mechanism to move downward. The working section of the saw blade descends through the avoidance notch of the vertical plate, so as to avoid interference with the vertical plate; When the working section of the saw blade contacts the strip-shaped plate, cutting begins; When the working section of the saw blade enters the transverse groove, the disconnection is completed, and a disconnected plate A is obtained; S03, Posture adjustment: A. The saw blade moves upward to avoid: Start the lifting mechanism to drive the gantry and the saw blade mechanism to move upward, so that the working section of the saw blade completely exits the avoidance notch of the vertical plate and ensures a certain height difference from the upper end of the vertical plate, so as to avoid interference between the saw blade and the subsequent movement of the L-shaped plate; B. Release the pressing on both sides: The piston rods of the two cylinders B retract synchronously, driving the two clamping plates to move away from each other and releasing the pressing on the two sides of the strip-shaped plate; C. Upward avoidance of the pressing plates: The piston rods of the two cylinders A retract synchronously, driving the two pressing plates to move upward by a certain distance, so that the two pressing plates are separated from the strip-shaped plate and the severed plate A respectively; the upward movement distance is such that the pressing plates do not interfere with the subsequent movement of the L-shaped plate; D. Retraction of the strip-shaped plate: The front chain conveyor is started, driving the strip-shaped plate to retract completely to the incoming material conveying surface to prevent the strip-shaped plate from interfering with the subsequent movement of the severed plate A; E. Lifting of the L-shaped plate: The piston rod of the lifting hydraulic cylinder extends, driving the L-shaped plate to rise to a high position; when the L-shaped plate is at the high position, the upper end of the vertical plate is lower than the saw blade, and the lower end of the horizontal plate exceeds the incoming material conveying surface and the blanking conveying surface; F. Rotation of the L-shaped plate: The rotary hydraulic cylinder is started, driving the L-shaped plate to rotate 90°, so that the L-shaped plate changes from the first posture to the second posture, and then driving the severed plate A placed on the L-shaped plate to rotate 90°; In this step, it is observed through step D whether there is adhesion between the strip-shaped plate and the severed plate A. If they can be completely separated, then proceed to the subsequent step E; S04. Cutting: A. Upper end pressing: The piston rods of the two cylinders A extend synchronously, driving the two pressing plates to move downward until they finally press tightly on both sides of the upper end of the severed plate A, and the middle part of the severed plate A is exposed; B. Performing cutting: The motor is started, driving the saw blade to rotate; the lifting mechanism is started, driving the gantry and the saw blade mechanism to move downward; when the working section of the saw blade contacts the severed plate A, cutting begins; when the working section of the saw blade enters the longitudinal groove, the cutting is completed, and two rectangular plates are obtained; S05. Unloading: A. Lowering of the L-shaped plate: The piston rod of the lifting hydraulic cylinder retracts, driving the L-shaped plate to lower to a low position; for the L-shaped plate at the low position, its bearing surface is flush with the incoming material conveying surface and the blanking conveying surface; B. Upward avoidance of the saw blade: The lifting mechanism is started, driving the gantry and the saw blade mechanism to move upward, and ensuring that there is a certain height difference between the lower end of the saw blade and the upper end of the vertical plate, so as to prevent the saw blade from interfering with the subsequent movement of the L-shaped plate; C. Upward avoidance of the pressing plates: The piston rods of the two cylinders A retract synchronously, driving the two pressing plates to move upward by a certain distance, so that the pressing plates are separated from the two rectangular plates; the upward movement distance is such that the pressing plates do not interfere with the subsequent movement of the L-shaped plate; D. Performing unloading: The piston rods of the two pusher hydraulic cylinders extend, pushing the two rectangular plates on the bearing surface to the blanking conveying surface, and then the piston rods of the two pusher hydraulic cylinders retract to the initial state; then the rear chain conveyor is started, transporting the two rectangular plates to the rear end in the conveying direction of the blanking conveying surface; S06. Resetting: A. L - shaped plate lifting: The piston rod of the lifting hydraulic cylinder extends, driving the L - shaped plate to rise to a high position. When the L - shaped plate is in the high position, the upper end of the vertical plate is lower than the saw blade, and the lower end of the horizontal plate exceeds the incoming material conveying surface and the discharging material conveying surface. B. L - shaped plate rotation: The rotary hydraulic cylinder starts, driving the L - shaped plate to rotate 90°, so that the L - shaped plate changes from the second posture to the first posture. C. L - shaped plate lowering: The piston rod of the lifting hydraulic cylinder retracts, driving the L - shaped plate to lower to a low position. For the L - shaped plate in the low position, its bearing surface is flush with the incoming material conveying surface and the discharging material conveying surface.

[0014] The present invention has the following advantages compared with the prior art: 1. It is used for the automatic cutting of nuclear decommissioning plates, and can perform two more cuts (steps S02 and S04) on the input strip - shaped plates to obtain small - sized plates that meet the requirements for barrel filling, reducing the labor intensity of operators and avoiding radiation exposure of operators during cutting operations.

[0015] 2. The automatic cutting method for nuclear decommissioning plates involves the linkage and cooperation of multiple components, different actions, and sequential timings, realizing two cuts on the input strip - shaped plates to obtain small - sized plates that meet the requirements for barrel filling. The actions between steps and within each step are coherent, compact, and redundant - free. The automatic cutting method for nuclear decommissioning plates considers the stability during plate cutting and adds anti - interference (avoidance) actions throughout the process, improving the reliability of the method.

[0016] The following further describes the present invention in combination with the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention from the first perspective; Figure 2 is a schematic structural diagram of the present invention from the second perspective; Figure 3 is a schematic structural diagram of the bearing mechanism; Figure 4 is a state diagram at the end of step S01 of the automatic cutting method for nuclear decommissioning plates; Figure 5 is a state diagram at the end of step S02 of the automatic cutting method for nuclear decommissioning plates; Figure 6 is a state diagram at the end of step S03 of the automatic cutting method for nuclear decommissioning plates; Figure 7 is a state diagram at the end of step S04 of the automatic cutting method for nuclear decommissioning plates; Figure 8 is a state diagram at the end of step S05 of the automatic cutting method for nuclear decommissioning plates; Figure 9It is a state diagram at the end of step S06 of the automatic cutting method for nuclear decommissioning plates.

[0018] Legend: Gantry 11; Notch A111; Driving wheel 121; Driven wheel 122; Saw blade 123; Working section 1231; Guide frame 124; Motor 125; Lifting mechanism 13; L-shaped plate 14; Horizontal plate 141; Longitudinal groove 1412; Transverse groove 1413; Vertical plate 142; Avoidance notch 1421; Front chain conveyor 2; Incoming material conveying surface 21; Rear chain conveyor 3; Outgoing material conveying surface 31; N-shaped bracket 41; Leg 411; Cross beam 412; Notch B413; Cylinder A42; Pressing plate 43; Lower bracket 51; Cylinder B52; Clamping plate 53; Pushing hydraulic cylinder 61; Pushing plate 62. Detailed implementation mode Example 1

[0019] As Figures 1-3 shown, the automatic sawing device for nuclear decommissioning plates includes a sawing machine, a front chain conveyor 2, a rear chain conveyor 3, an upper pressing device, a lateral clamping device and a plate pushing device.

[0020] The sawing machine includes a gantry 11, a saw blade mechanism, a lifting mechanism 13 and a bearing mechanism. The gantry 11 is fixedly installed on the ground, and a notch A111 is provided below the middle thereof. The saw blade mechanism is installed on the gantry 11, and it includes a driving wheel 121, a driven wheel 122, a saw blade 123, a guide frame 124 and a motor 125. The driving wheel 121 and the driven wheel 122 are arranged at the same height and are respectively rotatably installed on the gantry 11 and are located on both sides of the notch A111. Two guide frames 124 are respectively installed at the upper end of the middle of the gantry 11 and extend downward. Two guide frames 124 are respectively provided with guide holes for the saw blade 123 to pass through at the lower ends. The saw blade 123 is tensioned and wound between the driving wheel 121 and the driven wheel 122 to form two parallel horizontal sections up and down. The horizontal section at the lower end respectively passes through the guide holes of the two guide frames 124, so as to form a working section 1231 between the two guide holes. The working section 1231 is located in the notch A111 of the gantry 11. The extending direction of the saw blade 123 in the working section 1231 is horizontal, and the arrangement angle of the saw blade 123 in the working section 1231 is vertical. The motor 125 is fixedly installed on the gantry 11 and is associated with the driving wheel 121 to drive the driving wheel 121 to rotate. The lifting mechanism 13 is installed on the ground and is connected to the gantry 11 to drive the gantry 11 and the saw blade mechanism 123 to vertically lift and lower.

[0021] The bearing mechanism includes an L-shaped plate 14 and a lifting and rotating assembly. The L-shaped plate 14 includes a horizontal plate 141 and a vertical plate 142 that are perpendicular to each other and fixedly connected. The upper surface of the horizontal plate 141 is a bearing surface, and longitudinal grooves 1412 and transverse grooves 1413 arranged in a cross pattern are provided on the bearing surface. Both ends of the longitudinal grooves 1412 and the transverse grooves 1413 communicate with the edge of the bearing surface. A relief notch 1421 for the saw blade to move up and down is provided in the middle of the vertical plate 142. The relief notch 1421 extends downward from the upper edge of the vertical plate 142, and the lower end of the relief notch 1421 communicates with the transverse groove 1413 of the horizontal plate 141. The lifting and rotating assembly includes a jacking hydraulic cylinder 15 and a rotating hydraulic cylinder 16. The jacking hydraulic cylinder 15 is fixedly installed on the ground, the rotating hydraulic cylinder 16 is connected to the upper end of the jacking hydraulic cylinder 15, and the output shaft of the rotating hydraulic cylinder 16 is fixedly connected to the lower end surface of the horizontal plate 141. The connection point is directly below the intersection of the longitudinal groove 1412 and the transverse groove 1413 of the horizontal plate 141. The bearing surface of the bearing mechanism makes vertical lifting and / or horizontal rotation under the drive of the lifting and rotating assembly. The bearing surface of the bearing mechanism is located directly below the working section 1231 of the saw blade 123.

[0022] The upper end of the front chain conveyor 2 is provided with a feeding conveying surface 21, and the upper end of the rear chain conveyor 3 is provided with a discharging conveying surface 31. The feeding conveying surface 21 - the bearing surface - the discharging conveying surface 31 are connected in sequence to form a nuclear decommissioning plate conveying path.

[0023] The upper pressing device is arranged directly above the bearing surface and is used to press the nuclear decommissioning plate against the bearing surface in the vertical direction. The upper pressing device includes an n-shaped bracket 41, a cylinder A 42, and a pressing plate 43. The n-shaped bracket 41 includes two vertically arranged legs 411 and a cross beam 412 connected to the upper ends of the two legs 411. A communicating notch B 413 is provided on the cross beam 412 and the two legs 411. The n-shaped bracket 41 is arranged in the notch A 111 of the gantry 11. The two legs 411 are distributed on both sides of the L-shaped plate 14 and fixedly installed on the ground, and the cross beam 412 is located directly above the L-shaped plate 14. Two cylinders A 42 are respectively fixedly installed on both sides of the notch B 413 in the middle of the cross beam 412. The piston rods of the two cylinders A 42 both extend vertically downward. Two pressing plates 43 are respectively fixedly connected to the ends of the piston rods of the two cylinders A 42. The two pressing plates 43 respectively make vertical lifting movements under the drive of the corresponding cylinders A 42.

[0024] Two sets of lateral clamping devices are symmetrically arranged on both sides of the incoming material conveying surface 21, and are used to clamp both sides of the nuclear decommissioning plate from the horizontal direction. The lateral clamping device includes a lower support 51, a cylinder B 52, and a clamping plate 53. The lower support 51 is fixedly installed on the ground on one side of the front chain conveyor 2, the cylinder B 52 is fixedly installed on the lower support 51, its piston rod extends horizontally and is perpendicular to the conveying direction of the incoming material conveying surface 21, and the clamping plate 53 is fixedly installed at the end of the piston rod of the cylinder B 52 and is located on the upper side at the rear end of the conveying direction of the incoming material conveying surface 21. The clamping plates 53 of the two sets of lateral clamping devices are arranged facing each other. The clamping plates 53 of the two sets of lateral clamping devices can move towards each other to clamp the nuclear decommissioning plate at the rear end of the conveying direction of the incoming material conveying surface 21, and the clamping plates 53 of the two sets of lateral clamping devices can move away from each other to loosen the nuclear decommissioning plate at the rear end of the conveying direction of the incoming material conveying surface 21.

[0025] The plate pushing device is used to push the nuclear decommissioning plate on the bearing surface onto the blanking conveying surface 31. The plate pushing device includes a pushing hydraulic cylinder 61 and a pushing plate 62. The two pushing hydraulic cylinders 61 are respectively fixedly installed on both sides of the avoidance notch 1421 on the outer surface of the vertical plate 142, and the piston rods of the two hydraulic pushing cylinders 61 respectively pass through the vertical plate 142 and extend to one side of the inner surface of the vertical plate 142. The two pushing plates 62 are respectively fixedly connected to the piston rods of the hydraulic pushing cylinders 61 and are located on one side of the inner surface of the vertical plate 142. The two pushing plates 62 are respectively used to push the nuclear decommissioning plates on both sides of the transverse groove 1413 on the horizontal plate 141.

[0026] When the L-shaped plate 14 is in the first posture, the vertically downward projection area of the pressing plate 43 is located on both sides of the transverse groove 1413, which is convenient for pressing the nuclear decommissioning plate to be cut for the first time on the horizontal plate 141, and does not interfere with the downward path of the working section 1231 of the saw blade 123. When the working section 1231 of the saw blade 123 moves downward, it passes through the area between the two pressing plates 43. After completely cutting off the nuclear decommissioning plate, it finally enters the transverse groove 1413. When the L-shaped plate 14 is in the second posture, the vertically downward projection area of the pressing plate 43 is located on both sides of the longitudinal groove 1412, which is convenient for pressing the nuclear decommissioning plate to be cut for the second time on the horizontal plate 141, and does not interfere with the downward path of the working section 1231 of the saw blade 123. When the working section 1231 of the saw blade 123 moves downward, it passes through the area between the two pressing plates 43. After completely cutting off the nuclear decommissioning plate, it finally enters the longitudinal groove 1412.

[0027] Preferably, the lifting mechanism 13 is a hydraulic cylinder symmetrically arranged on both sides of the notch of the gantry 11. The seat body of the hydraulic cylinder is fixedly installed on the ground, and the piston rod of the hydraulic cylinder is fixedly connected to the gantry 11.

[0028] Preferably, the L-shaped plate 14 is driven by the lifting and rotating assembly to move vertically up and down, so as to switch between a low position and a high position. When the L-shaped plate 14 is in the low position, the bearing surface is flush with the incoming material conveying surface 21 and the blanking conveying surface 31. When the L-shaped plate 14 is in the high position, the whole L-shaped plate 14 exceeds the heights of the incoming material conveying surface 21 and the blanking conveying surface 31.

[0029] Preferably, the L-shaped plate 14 is driven by the lifting and rotating assembly to rotate, so as to switch between a first posture and a second posture. When the L-shaped plate 14 is in the first posture, the vertical plate 142 is located on one side of the nuclear decommissioning plate conveying path, there is no obstruction between the bearing surface and the incoming material conveying surface 21 and the blanking conveying surface 31. The avoidance notch 1421 in the middle of the vertical plate 142 is used to accommodate the space required for the lifting and moving of the working section 1231 of the saw blade 123. The transverse groove 1413 on the horizontal plate 141 is located directly below the working section 1231 of the saw blade 123. When the L-shaped plate 41 is in the second posture, the vertical plate 142 is located between the bearing surface and the incoming material conveying surface 21, so as to form a partition between the bearing surface and the incoming material conveying surface 21, there is no obstruction between the bearing surface and the blanking conveying surface 31, and the longitudinal groove 1412 on the horizontal plate 141 is located directly below the working section 1231 of the saw blade 123.

[0030] Preferably, the rear edge of the conveying direction of the front chain conveyor 2 is flush with and adjacent to one side edge of the horizontal plate 141 of the L-shaped plate 14 in the low position and the first posture, and the front edge of the conveying direction of the rear chain conveyor 3 is flush with and adjacent to the other side edge of the horizontal plate 141 of the L-shaped plate 14 in the low position and the first posture.

[0031] A method for automatically cutting nuclear decommissioning plates, based on an automatic sawing device for nuclear decommissioning plates. Before performing the method, the automatic sawing device for nuclear decommissioning plates is in an initial state.

[0032] See Figures 1-2 , in the initial state: Ⅰ. The lifting mechanism 13 drives the gantry 11 and the saw blade mechanism to rise to the highest point of the stroke.

[0033] Ⅱ. The lifting and rotating assembly drives the L-shaped plate to descend to the low position and rotate to the first posture, so that the two side edges of the bearing surface are respectively connected to the incoming material conveying surface 21 and the blanking conveying surface 31.

[0034] Ⅲ. The piston rods of the two cylinders A42 are both in the retracted state, so that the pressing plate 43 is in the highest position.

[0035] Ⅳ. The piston rods of the two cylinders B52 are both in the retracted state, so that the two clamping plates 53 are farthest apart and do not contact the nuclear decommissioning plates on the incoming material conveying surface 21.

[0036] Ⅴ. The piston rod of the material pushing hydraulic cylinder 61 is in the retracted state, thus avoiding interference with the nuclear decommissioning plates entering the bearing surface from the incoming material conveying surface 21.

[0037] See Figures 4-9 , the method is as follows: S01, Loading: A. Draw disconnection lines: Disconnection lines (not shown in the figure) are drawn at intervals along the length direction on the strip-shaped plate to be cut, and the disconnection lines are parallel to the width direction of the strip-shaped plate. The strip-shaped plate pre-cut into a specific width is placed on the incoming material conveying surface 21.

[0038] B. Perform loading: Start the front chain conveyor 2, and the strip-shaped plate is driven by the front chain conveyor 2 to move towards the bearing surface. When the first disconnection line at the front end of the strip-shaped plate reaches directly below the saw blade 123, the front chain conveyor 2 stops running. At this time, the front end of the strip-shaped plate does not enter the blanking conveying surface 31.

[0039] S02, Disconnection: A. Press the upper end: The piston rods of the two cylinders A42 extend synchronously, driving the two pressing plates 43 to move downward until they finally press tightly on the upper end of the strip-shaped plate at the same time.

[0040] B. Press the two sides: The piston rods of the two cylinders B52 extend synchronously, driving the two clamping plates 53 to move towards each other, and simultaneously contacting and clamping the two sides of the strip-shaped plate.

[0041] C. Perform cutting: The motor 125 is started to drive the saw blade 123 to rotate. The lifting mechanism 13 is started to drive the gantry and the saw blade mechanism to move downward. The working section 1231 of the saw blade 123 descends through the avoidance notch 1421 of the vertical plate 142, thus avoiding interference with the vertical plate 142. When the working section 1231 of the saw blade 123 contacts the strip-shaped plate, cutting begins. When the working section 1231 of the saw blade 123 enters the transverse groove 1413, the disconnection is completed, and a disconnected plate A is obtained.

[0042] S03, Posture adjustment: A. The saw blade moves upward for avoidance: The lifting mechanism 13 is started to drive the gantry 11 and the saw blade mechanism to move upward, so that the working section 1231 of the saw blade 123 completely exits the avoidance notch 1421 of the vertical plate 142, and a certain height difference is ensured with the upper end of the vertical plate 142, thus avoiding interference between the saw blade 123 and the subsequent movement of the L-shaped plate 14.

[0043] B. Release the clamping on both sides: The piston rods of the two cylinders B52 retract synchronously, driving the two clamping plates 53 to move away from each other, and releasing the clamping on the two sides of the strip-shaped plate.

[0044] C. Upward avoidance of the pressing plates: The piston rods of the two cylinders A42 retract synchronously, driving the two pressing plates 43 to move upward by a certain distance, so that the two pressing plates 43 are separated from the strip-shaped plate and the cut plate A respectively; the upward movement distance is such that the pressing plates 43 do not interfere with the subsequent movement of the L-shaped plate.

[0045] D. Retraction of the strip-shaped plate: The front chain conveyor 2 starts, driving the strip-shaped plate to retract completely to the incoming material conveying surface to avoid the strip-shaped plate interfering with the subsequent movement of the cut plate A.

[0046] E. Lifting of the L-shaped plate: The piston rod of the lifting hydraulic cylinder 15 extends, driving the L-shaped plate 14 to rise to a high position; when the L-shaped plate 14 is at the high position, the upper end of the vertical plate 142 is lower than the saw blade 123, and the lower end of the horizontal plate 141 exceeds the incoming material conveying surface and the discharging conveying surface.

[0047] F. Rotation of the L-shaped plate: The rotary hydraulic cylinder 16 starts, driving the L-shaped plate 14 to rotate 90°, so that the L-shaped plate 14 changes from the first posture to the second posture, and then driving the cut plate A placed on the L-shaped plate 14 to rotate 90°.

[0048] In this step, observe whether there is adhesion between the strip-shaped plate and the cut plate A through sub-step D. If they can be completely separated, then enter the subsequent sub-step E.

[0049] In this step, sub-steps B and C have no sequential order.

[0050] S04. Cutting: A. Upper end pressing: The piston rods of the two cylinders A42 extend synchronously, driving the two pressing plates 43 to move downward until they finally press tightly on both sides of the upper end of the cut plate A at the same time, and the middle part of the cut plate A is exposed.

[0051] B. Perform cutting: The motor 125 starts, driving the saw blade 123 to rotate. The lifting mechanism 13 starts, driving the gantry 11 and the saw blade mechanism to move downward. When the working section 1231 of the saw blade 123 contacts the cut plate A, cutting starts. When the working section 1231 of the saw blade 123 enters the longitudinal groove 1412, the cutting is completed, and two rectangular plates are obtained.

[0052] S05. Unloading: A. Lowering of the L-shaped plate: The piston rod of the lifting hydraulic cylinder 15 retracts, driving the L-shaped plate 14 to lower to a low position. For the L-shaped plate 14 at the low position, its bearing surface is flush with the incoming material conveying surface 21 and the discharging conveying surface 31.

[0053] B. Upward avoidance of the saw blade: The lifting mechanism 13 starts, driving the gantry 11 and the saw blade mechanism to move upward, and ensuring that there is a certain height difference between the lower end of the saw blade 123 and the upper end of the vertical plate 142, so as to avoid the saw blade 123 interfering with the subsequent movement of the L-shaped plate 14.

[0054] C. Upward avoidance of the pressing plate: The piston rods of the two cylinders A42 retract synchronously, driving the two pressing plates 43 to move upward by a certain distance, so that the pressing plates 43 are separated from the two rectangular plates. The upward movement distance is determined by ensuring that the pressing plates 43 do not interfere with the subsequent movement of the L-shaped plate 14.

[0055] D. Execute unloading: The piston rods of the two pusher hydraulic cylinders 61 extend, and the two rectangular plates on the bearing surface are pushed onto the blanking conveying surface 31 through the two pusher plates 62. Then, the piston rods of the two pusher hydraulic cylinders 61 retract to the initial state. Next, the rear chain conveyor 3 starts and conveys the two rectangular plates to the rear end in the conveying direction of the blanking conveying surface 31.

[0056] S06, Reset: A. Lifting of the L-shaped plate: The piston rod of the lifting hydraulic cylinder 15 extends, driving the L-shaped plate 14 to rise to a high position. When the L-shaped plate 14 is at the high position, the upper end of the vertical plate 142 is lower than the saw blade 123, and the lower end of the horizontal plate 13 exceeds the incoming material conveying surface 21 and the blanking conveying surface 31.

[0057] B. Rotation of the L-shaped plate: The rotary hydraulic cylinder 16 starts, driving the L-shaped plate 14 to rotate 90°, so that the L-shaped plate 14 changes from the second posture to the first posture.

[0058] C. Lowering of the L-shaped plate: The piston rod of the lifting hydraulic cylinder 15 retracts, driving the L-shaped plate 14 to descend to a low position. For the L-shaped plate 14 at the low position, its bearing surface is flush with the incoming material conveying surface 21 and the blanking conveying surface 31.

[0059] Exclude the sub-step A of step S01, and then repeat steps S01 - S06, which realizes the automatic cutting of nuclear decommissioning plates.

Claims

1. Automatic sawing device for nuclear decommissioning plates, comprising a sawing machine; characterized in that: The sawing machine includes a bearing mechanism; a bearing surface for vertical lifting and / or horizontal rotation is provided at the upper end of the bearing mechanism; The automatic sawing device for nuclear decommissioning plates further includes a front chain conveyor, a rear chain conveyor, an upper pressing device, a lateral clamping device, and a plate pushing device; a feeding conveying surface is provided at the upper end of the front chain conveyor, a discharging conveying surface is provided at the upper end of the rear chain conveyor, and the feeding conveying surface - bearing surface - discharging conveying surface are connected in sequence to form a conveying path for nuclear decommissioning plates; the upper pressing device is arranged directly above the bearing surface and is used to press the nuclear decommissioning plates against the bearing surface in the vertical direction; two sets of lateral clamping devices are symmetrically arranged on both sides of the feeding conveying surface and are used to clamp the two sides of the nuclear decommissioning plates in the horizontal direction; the plate pushing device is used to push the nuclear decommissioning plates on the bearing surface onto the discharging conveying surface.

2. The automatic sawing device for nuclear decommissioning plates according to claim 1, characterized in that: The sawing machine further includes a gantry, a saw blade mechanism, and a lifting mechanism; the gantry is fixedly installed on the ground, and a notch A is provided below the middle thereof; the saw blade mechanism is installed on the gantry and includes a driving wheel, a driven wheel, a saw blade, a guiding frame, and a motor; the driving wheel and the driven wheel are arranged at the same height and are respectively rotatably installed on the gantry and are located on both sides of the notch A; two guiding frames are respectively installed at the upper end of the middle of the gantry and extend downward, and two guiding holes for the saw blade to pass through are respectively provided at the lower ends of the two guiding frames; the saw blade is tensioned and wound between the driving wheel and the driven wheel to form two parallel horizontal sections up and down, and the horizontal section at the lower end respectively passes through the guiding holes of the two guiding frames, so as to form a working section between the two guiding holes, the working section is located in the notch A of the gantry, the extending direction of the saw blade in the working section is horizontal, and the arrangement angle of the saw blade in the working section is vertical; the motor is fixedly installed on the gantry and is associated with the driving wheel to drive the driving wheel to rotate; the lifting mechanism is installed on the ground and is connected to the gantry to drive the gantry and the saw blade mechanism to lift vertically; the bearing surface of the bearing mechanism is located directly below the working section of the saw blade.

3. The automatic sawing device for nuclear decommissioning plates according to claim 2, characterized in that: The bearing mechanism includes an L-shaped plate and a lifting and rotating assembly; the L-shaped plate includes a horizontal plate and a vertical plate that are perpendicular to each other and fixedly connected, the upper surface of the horizontal plate is the bearing surface, longitudinal grooves and transverse grooves arranged in a cross pattern are provided on the bearing surface, both ends of the longitudinal grooves and the transverse grooves communicate to the edge of the bearing surface, and an avoidance notch for the saw blade to lift and move is provided in the middle of the vertical plate, the avoidance notch extends downward from the upper edge of the vertical plate, and the lower end of the avoidance notch communicates to the transverse groove of the horizontal plate; the lifting and rotating assembly includes a jacking hydraulic cylinder and a rotating hydraulic cylinder; the jacking hydraulic cylinder is fixedly installed on the ground, the rotating hydraulic cylinder is connected to the upper end of the jacking hydraulic cylinder, and the output shaft of the rotating hydraulic cylinder is fixedly connected to the lower end surface of the horizontal plate, and the connection part is directly below the intersection of the longitudinal groove and the transverse groove of the horizontal plate.

4. The automatic sawing device for nuclear decommissioning plates according to claim 3, characterized in that: The upper pressing device includes an N-shaped bracket, cylinder A, and a pressing plate; the N-shaped bracket includes two vertically arranged legs and a crossbeam connected to the upper ends of the two legs, and there are communicating notches B on the crossbeam and the two legs; the N-shaped bracket is arranged in notch A of the gantry, the two legs are distributed on both sides of the L-shaped plate and fixedly installed on the ground, and the crossbeam is located directly above the L-shaped plate; two cylinder As are respectively fixedly installed on both sides of notch B in the middle of the crossbeam, the piston rods of the two cylinder As vertically extend downward, and two pressing plates are respectively fixedly connected to the ends of the piston rods of the two cylinder As, and the two pressing plates respectively make vertical lifting movements driven by the corresponding cylinder A.

5. The automatic sawing device for nuclear decommissioning plates according to claim 4, characterized in that: The plate pushing device includes a pushing hydraulic cylinder and a pushing plate; two pushing hydraulic cylinders are respectively fixedly installed on both sides of the avoidance notch on the outer surface of the vertical plate, and the piston rods of the two hydraulic pushing cylinders respectively pass through the vertical plate and extend to one side of the inner surface of the vertical plate; two pushing plates are respectively fixedly connected to the piston rods of the hydraulic pushing cylinders and are located on one side of the inner surface of the vertical plate, and the two pushing plates are respectively used to push out the nuclear decommissioning plates on both sides of the transverse groove on the horizontal plate.

6. The automatic sawing device for nuclear decommissioning plates according to claim 5, characterized in that: The L-shaped plate is driven by the lifting and rotating assembly to make vertical lifting movements, so as to switch between the low position and the high position. When the L-shaped plate is in the low position, the bearing surface is flush with the incoming material conveying surface and the outgoing material conveying surface. When the L-shaped plate is in the high position, the whole L-shaped plate exceeds the heights of the incoming material conveying surface and the outgoing material conveying surface; the L-shaped plate is driven by the lifting and rotating assembly to make horizontal rotating movements, so as to switch between the first posture and the second posture; when the L-shaped plate is in the first posture, the vertical plate is located on one side of the nuclear decommissioning plate conveying path, there is no obstruction between the bearing surface and the incoming material conveying surface and the outgoing material conveying surface, the avoidance notch in the middle of the vertical plate is used to accommodate the space required for the lifting movement of the working section of the saw blade, the transverse groove on the horizontal plate is located directly below the working section of the saw blade, and the vertically downward projection area of the pressing plate is located on both sides of the transverse groove; when the L-shaped plate is in the second posture, the vertical plate is located between the bearing surface and the incoming material conveying surface, so as to form a partition between the bearing surface and the incoming material conveying surface, there is no obstruction between the bearing surface and the outgoing material conveying surface, the longitudinal groove on the horizontal plate is located directly below the working section of the saw blade, and the vertically downward projection area of the pressing plate is located on both sides of the longitudinal groove.

7. The automatic sawing device for nuclear decommissioning plates according to claim 6, characterized in that: The side clamping device includes a lower bracket, cylinder B, and a clamping plate; the lower bracket is fixedly installed on the ground on one side of the front chain conveyor, cylinder B is fixedly installed on the lower bracket, its piston rod horizontally extends and is perpendicular to the conveying direction of the incoming material conveying surface, and the clamping plate is fixedly installed on the end of the piston rod of cylinder B and is located on the upper side of the rear end of the incoming material conveying surface in the conveying direction; the clamping plates of the two sets of side clamping devices are arranged facing each other.

8. The automatic sawing device for nuclear decommissioning plates according to claim 7, characterized in that: The rear edge of the conveying direction of the front chain conveyor is flush with and adjacent to one side edge of the horizontal plate of the L-shaped plate in the low position and the first posture, and the front edge of the conveying direction of the rear chain conveyor is flush with and adjacent to the other side edge of the horizontal plate of the L-shaped plate in the low position and the first posture.

9. The automatic cutting method for nuclear decommissioning plates, based on the automatic sawing device for nuclear decommissioning plates described in claim 8, is characterized in that: Before performing the method, the nuclear decommissioning plate automatic sawing device is in the initial state; In the initial state: Ⅰ. The lifting mechanism drives the gantry and the saw blade mechanism to rise to the highest point of the stroke; Ⅱ. The lifting and rotating assembly drives the L-shaped plate to descend to the low position and rotate to the first posture, so that the two side edges of the bearing surface are respectively connected to the incoming material conveying surface and the blanking conveying surface; Ⅲ. The piston rods of both cylinder A are in the retracted state, so that the pressing plate is in the highest position; Ⅳ. The piston rods of both cylinder B are in the retracted state, so that the two clamping plates are farthest apart, and thus do not contact the nuclear decommissioning plates on the incoming material conveying surface; Ⅴ. The piston rod of the material pushing hydraulic cylinder is in the retracted state, so as to avoid interfering with the entry of the nuclear decommissioning plates from the incoming material conveying surface onto the bearing surface; The method is as follows: S01, Loading: A. Draw separation lines: Intermittently draw separation lines along the length direction on the strip-shaped plate to be cut. The separation lines are parallel to the width direction of the strip-shaped plate; Place the strip-shaped plate pre-cut into a specific width on the incoming material conveying surface; B. Execute loading: Start the front chain conveyor. The strip-shaped plate is driven by the front chain conveyor to move towards the bearing surface. When the first separation line at the front end of the strip-shaped plate reaches directly below the saw blade, the front chain conveyor stops running; At this time, the front end of the strip-shaped plate does not enter the blanking conveying surface; S02, Separation: A. Press the upper end: The piston rods of both cylinder A extend synchronously, driving the two pressing plates to move downward until they finally press tightly on the upper end of the strip-shaped plate at the same time; B. Press the two sides: The piston rods of both cylinder B extend synchronously, driving the two clamping plates to move towards each other, and simultaneously contacting and clamping the two sides of the strip-shaped plate; C. Execute cutting: The motor starts, driving the saw blade to rotate; The lifting mechanism starts, driving the gantry and the saw blade mechanism to move downward. The working section of the saw blade descends through the avoidance notch of the vertical plate, so as to avoid interference with the vertical plate; When the working section of the saw blade contacts the strip-shaped plate, cutting starts; When the working section of the saw blade enters the transverse groove, the separation is completed, and a separated plate A is obtained; S03, Posture adjustment: A. The saw blade moves upward to avoid: The lifting mechanism starts, driving the gantry and the saw blade mechanism to move upward, so that the working section of the saw blade completely exits the avoidance notch of the vertical plate, and ensures that there is a certain height difference from the upper end of the vertical plate, so as to avoid interference between the saw blade and the subsequent movement of the L-shaped plate; B. Release the pressing on both sides: The piston rods of both cylinder B retract synchronously, driving the two clamping plates to move away from each other, releasing the pressing on the two sides of the strip-shaped plate; C. The pressing plate moves upward to avoid: The piston rods of both cylinder A retract synchronously, driving the two pressing plates to move upward a certain distance, so that the two pressing plates are respectively separated from the strip-shaped plate and the separated plate A; The upward movement distance is based on the condition that the pressing plate does not interfere with the subsequent movement of the L-shaped plate; D. The strip-shaped plate moves backward: The front chain conveyor starts, driving the strip-shaped plate to move backward completely onto the incoming material conveying surface, so as to avoid the strip-shaped plate interfering with the subsequent movement of the separated plate A; In this step, observe whether there is adhesion between the strip-shaped plate and the separated plate A through sub-step D. If they can be completely separated, then enter sub-step E; E. Lift the L-shaped plate: The piston rod of the jacking hydraulic cylinder extends, driving the L-shaped plate to rise to the high position; When the L-shaped plate is in the high position, the upper end of the vertical plate is lower than the saw blade, and the lower end of the horizontal plate exceeds the incoming material conveying surface and the blanking conveying surface; F. Rotation of the L-shaped plate: The rotary hydraulic cylinder is activated to drive the L-shaped plate to rotate by 90°, causing the L-shaped plate to change from the first posture to the second posture, and then driving the cut sheet A placed on the L-shaped plate to rotate by 90°. S04, Cutting: A. Upper end pressing: The piston rods of the two cylinders A extend synchronously, driving the two pressing plates to move downward until they finally press firmly on both sides of the upper end of the cut sheet A at the same time, and the middle part of the cut sheet A is exposed. B. Performing cutting: The motor is started to drive the saw blade to rotate; the lifting mechanism is started to drive the gantry and the saw blade mechanism to move downward; when the working section of the saw blade contacts the cut sheet A, cutting begins; when the working section of the saw blade enters the longitudinal groove, the cutting is completed, and two rectangular sheets are obtained. S05, Unloading: A. Lowering of the L-shaped plate: The piston rod of the lifting hydraulic cylinder retracts, driving the L-shaped plate to lower to the low position; for the L-shaped plate in the low position, its bearing surface is flush with the incoming material conveying surface and the discharging conveying surface. B. Upward avoidance of the saw blade: The lifting mechanism is started to drive the gantry and the saw blade mechanism to move upward, and ensure that there is a certain height difference between the lower end of the saw blade and the upper end of the vertical plate, so as to avoid interference between the saw blade and the subsequent movement of the L-shaped plate. C. Upward avoidance of the pressing plate: The piston rods of the two cylinders A retract synchronously, driving the two pressing plates to move upward by a certain distance, so that the pressing plates are separated from the two rectangular sheets; the upward movement distance is based on the condition that the pressing plates do not interfere with the subsequent movement of the L-shaped plate. D. Performing unloading: The piston rods of the two pusher hydraulic cylinders extend to push the two rectangular sheets on the bearing surface onto the discharging conveying surface, and then the piston rods of the two pusher hydraulic cylinders retract to the initial state; then the rear chain conveyor is started to convey the two rectangular sheets to the rear end in the conveying direction of the discharging conveying surface. S06, Resetting: A. Lifting of the L-shaped plate: The piston rod of the lifting hydraulic cylinder extends, driving the L-shaped plate to rise to the high position; when the L-shaped plate is in the high position, the upper end of the vertical plate is lower than the saw blade, and the lower end of the horizontal plate exceeds the incoming material conveying surface and the discharging conveying surface. B. Rotation of the L-shaped plate: The rotary hydraulic cylinder is activated to drive the L-shaped plate to rotate by 90°, causing the L-shaped plate to change from the second posture to the first posture. C. Lowering of the L-shaped plate: The piston rod of the lifting hydraulic cylinder retracts, driving the L-shaped plate to lower to the low position; for the L-shaped plate in the low position, its bearing surface is flush with the incoming material conveying surface and the discharging conveying surface.

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