Automatic blanking device for anchor rod cutting

Abstract

The utility model provides an anchor rod cutting automatic blanking device which comprises a machine frame, a first material guide plate is arranged on the machine frame, a second material guide plate is connected to the first material guide plate in a rotating mode, the machine frame is further provided with a driving assembly, a material guide groove is defined by the first material guide plate and the second material guide plate, two detection assemblies are arranged on the first material guide plate in a spaced mode, and the two detection assemblies are arranged on the second material guide plate in a rotating mode. The two detection assemblies are arranged close to the two opposite ends of the guide groove respectively, each detection assembly comprises a first support, a first rotating rod and a first travel switch, a first baffle is arranged on the first rotating rod, part of the first baffle extends into the guide groove, and the first travel switch is electrically connected with the driving assembly; and the material receiving frame is arranged close to the second material guide plate and is positioned below the second material guide plate. According to the anchor rod collecting device, the technical problem that an existing anchor rod cutting device needs to manually collect cut anchor rods is solved, and the technical effects that the cut anchor rods are automatically collected into the collecting frame in a centralized mode, and follow-up transfer of the cut anchor rods is facilitated are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to an automatic unloading device for cutting anchor rods. Background Art

[0002] Anchor rods are a type of equipment commonly used in construction and engineering technology, mainly used for support and reinforcement. Anchor rods can effectively support rock and soil layers, prevent collapse and landslide accidents, and are often used in underground cavern construction and tunnel engineering.

[0003] The Chinese utility model patent with the publication number of CN220480438U discloses a straight-mouth cutting device for an anchor rod production line, comprising a machine body, a control panel is arranged on one side of the top of the machine body, a plurality of side mounting boxes are arranged in the middle of the top of the machine body, a mounting cavity is arranged inside the side mounting box, an adjusting device is arranged inside the mounting cavity, a group of centering clamps are symmetrically arranged on the front of the adjusting device, and an anchor rod is inserted in the middle of a group of centering clamps; a mounting frame is arranged on the other side of the machine body, a hydraulic cylinder is arranged at the middle position of the top of the mounting frame, and the output end of the hydraulic cylinder passes through the mounting frame and is connected to the cutting knife; a collecting assembly matching with the machine body is arranged at the bottom of the mounting frame, a horizontal plate is arranged inside the mounting frame, and a cutting groove matching with the cutting knife is opened on the surface of the horizontal plate. Under the action of the adjusting device, the straight-mouth cutting device for the anchor rod production line can drive the centering clamp to reciprocate, so that when the anchor rod needs to be cut, one end of the anchor rod can be fixed and transported by a plurality of centering clamps, which can replace manual work, thereby reducing the workload of the operator and improving the work efficiency.

[0004] During the process of cutting anchor rods using the straight-mouth cutting device of the anchor rod production line provided by the above-mentioned utility model patent, after the cutting knife cuts the anchor rod, the cut part of the anchor rod falls freely under the action of gravity. Subsequently, the cut anchor rods need to be manually collected and transported to the next workstation for processing, resulting in reduced production efficiency. Utility Model Content

[0005] In view of the deficiencies existing in the prior art, the utility model provides an automatic unloading device for cutting anchor rods, which solves the problem in the prior art that the cut anchor rods need to be collected manually.

[0006] According to an embodiment of the utility model, an automatic unloading device for anchor rod cutting includes a frame, a fixed first material guide plate is provided on the frame, a second material guide plate is rotatably connected to the first material guide plate, and the frame is also provided with a driving component that is transmission-connected to the second material guide plate, the first material guide plate and the second material guide plate form a material guide trough, two detection components are arranged at intervals on the first material guide plate, and the two detection components are respectively arranged near the opposite ends of the material guide trough, the detection component includes a first bracket installed on the first material guide plate, a first rotating rod rotatably connected to the first bracket, and a first travel switch matched with the first rotating rod, the rotating axis of the first rotating rod is perpendicular to the length direction of the material guide trough, a first baffle is provided on the first rotating rod and part of the first baffle extends into the material guide trough, and the first travel switch is electrically connected to the driving component; it also includes a material receiving frame, which is arranged near the second material guide plate and located below the second material guide plate.

[0007] Furthermore, two vertical support plates are spaced apart on the frame and each of the support plates is provided with a first through hole, and mounting plates are provided at both ends of the first material guide plate and each of the mounting plates is provided with a first mounting hole aligned with the first through hole.

[0008] Furthermore, a connecting rod is provided on one side of the first material guide plate close to the second material guide plate, a connecting portion is provided on the second material guide plate, and a connecting hole matching with the connecting rod is provided on the connecting portion.

[0009] Furthermore, the driving assembly includes a cylinder and a telescopic rod arranged at the output end of the cylinder, one end of the cylinder away from the telescopic rod is rotatably connected to the frame, and one end of the telescopic rod away from the cylinder is rotatably connected to the second material guide plate.

[0010] Furthermore, a first connecting block is provided at one end of the cylinder away from the telescopic rod, a first rotating shaft is provided on the first connecting block, a first mounting seat is provided on the frame, and a first through hole matching the first rotating shaft is provided on the first mounting seat.

[0011] Furthermore, a second connecting block is provided at one end of the telescopic rod away from the cylinder, a second rotating shaft is provided on the second connecting block, a second mounting seat is provided on the second material guide plate, and a second through hole matching the second rotating shaft is provided on the second mounting seat.

[0012] Furthermore, a first counterweight block is disposed on the first baffle plate, and the first counterweight block is disposed close to an end of the first baffle plate away from the first rotating rod.

[0013] Furthermore, a monitoring component is provided on the first material guide plate, and the monitoring component is located on a side of one of the detection components away from the other detection component. The monitoring component includes a second bracket installed on the first material guide plate, a second rotating rod rotatably connected to the second bracket, and a second travel switch matched with the second rotating rod, the rotating axis of the second rotating rod is perpendicular to the length direction of the material guide trough, and a second baffle is provided on the second rotating rod and a portion of the second baffle extends into the material guide trough.

[0014] Furthermore, a second counterweight block is disposed on the second baffle plate, and the second counterweight block is disposed close to an end of the second baffle plate away from the second rotating rod.

[0015] Furthermore, vertical material baffle plates are respectively provided on opposite sides of the material receiving frame, and the mutually close sides of the material baffle plates respectively have guiding inclined surfaces, and the ends of the guiding inclined surfaces away from the material receiving frame are inclined toward the outside of the material receiving frame.

[0016] Compared with the prior art, the utility model has the following beneficial effects: a first material guide plate and a second material guide plate are used to form a material guide groove for the anchor rod to pass through; one end of the anchor rod extends into the material guide groove during the transportation of the cutting equipment; and after the anchor rod is cut, the cut portion is supported by the anchor rod and moves in the material guide groove as the anchor rod is transported; when one end of the anchor rod extends into the material guide groove, it first abuts against a first baffle plate on one of the detection components and pushes the first rotating rod to rotate and trigger the corresponding first travel switch as the anchor rod moves; when the cut portion of the anchor rod completely enters the guide groove, the anchor rod abuts against the first baffle plate on the other detection component and pushes the first rotating rod to rotate and trigger the corresponding first travel switch; the two first After the travel switches are triggered, the driving component drives the second guide plate to rotate so that the cut part of the anchor rod falls into the receiving frame along the second guide plate. After the cut part of the anchor rod falls into the receiving frame, the two first baffles are reset respectively under the action of the gravity they are subjected to and drive the first rotating rod to reset. As the anchor rod continues to be conveyed, the driving component can be intermittently triggered to flip the second guide plate and pour each cut part of the anchor rod into the receiving frame. This solves the technical problem that the existing anchor rod cutting equipment requires manual collection of the cut anchor rods, and produces the technical effect of automatically collecting the cut anchor rods into the receiving frame to facilitate the subsequent transportation of the cut anchor rods, which is beneficial to improving the processing efficiency of the anchor rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the second material guide plate before flipping in the automatic material feeding device for cutting anchor rods according to one embodiment of the utility model;

[0018] Figure 2It is a structural schematic diagram of the second material guide plate after flipping in the automatic material feeding device for cutting anchor rods according to one embodiment of the utility model;

[0019] Figure 3 It is a partial structural schematic diagram of an automatic unloading device for cutting anchor rods according to an embodiment of the utility model;

[0020] Figure 4 It is a structural schematic diagram of a detection component in an automatic unloading device for cutting anchor rods according to an embodiment of the utility model;

[0021] Figure 5 The present invention is a schematic structural diagram of a monitoring component in an automatic unloading device for cutting anchor rods according to an embodiment of the present invention.

[0022] In the above drawings: 1. frame; 11. support plate; 12. first mounting seat; 2. first material guide plate; 21. mounting plate; 22. connecting rod; 23. threaded rod; 24. locking nut; 3. second material guide plate; 31. connecting part; 32. second mounting seat; 4. driving assembly; 41. cylinder; 42. telescopic rod; 43. first connecting block; 44. first rotating shaft; 45. second connecting block; 46. second rotating shaft; 5. material guide trough; 6. detection assembly; 61. first bracket; 62. first rotating rod; 63. first travel switch; 64. first baffle; 65. first counterweight; 66. second mounting hole; 7. material receiving frame; 71. material baffle; 72. guide slope; 8. monitoring assembly; 81. second bracket; 82. second rotating rod; 83. second travel switch; 84. second baffle; 85. second counterweight. DETAILED DESCRIPTION

[0023] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] like Figures 1 to 5 As shown, an embodiment of the utility model proposes an automatic unloading device for anchor rod cutting, which is arranged at the discharge end of the anchor rod cutting device, and is used to receive part of the anchor rod cut from the anchor rod cutting equipment and collect the cut parts of the anchor rod in one place.

[0025] Please refer to Figure 1 and Figure 2The automatic unloading device for anchor cutting includes a frame 1, a first material guide plate 2 is provided on the frame 1 and the first material guide plate 2 is fixed on the frame 1, a second material guide plate 3 is rotatably connected to the first material guide plate 2, a driving component 4 is also provided on the frame 1 and is transmission-connected to the second material guide plate 3, the first material guide plate 2 and the second material guide plate 3 form a material guide trough 5 and the material guide trough 5 is communicated with the discharge end of the anchor cutting device, two detection components 6 are spaced apart on the first material guide plate 2, and the two detection components 6 are respectively arranged near the opposite ends of the material guide trough 5, and the detection component 6 includes a first bracket 61, a first rotating rod 62 and a first rotating rod 63. A travel switch 63, the first bracket 61 is installed on the first guide plate 2, the first rotating rod 62 is rotatably connected to the first bracket 61 and the rotating axis of the first rotating rod 62 is perpendicular to the length direction of the guide trough 5, and a first baffle 64 is provided on the first rotating rod 62, and the end of the first baffle 64 away from the first rotating rod 62 extends into the guide trough 5, the first travel switch 63 cooperates with the first rotating rod 62 and is electrically connected to the driving assembly 4; the anchor rod cutting automatic unloading device also includes a material receiving frame 7, and the material receiving frame 7 is arranged close to the frame 1 and is located below the second guide plate 3.

[0026] Specifically, the working process of using the anchor rod cutting automatic unloading device provided in this embodiment to collect the anchor rod cut by the anchor rod cutting equipment is as follows: the anchor rod cutting automatic unloading device is installed on one side of the cutting equipment and the material receiving trough is connected with the material discharging end of the cutting equipment. During the transportation of the anchor rod on the cutting equipment, one end of the anchor rod first extends into the guide trough 5. When one end of the anchor rod extends into the guide groove, it abuts against the first baffle 64 on one of the detection components 6. As the anchor rod moves, the anchor rod pushes the first rotating rod 62 to rotate and triggers the corresponding first stroke switch 63. After the cutting equipment cuts the anchor rod, the cut-off part of the anchor rod is supported by the anchor rod and moves in the guide trough 5 as the anchor rod is transported. When the cut-off part of the anchor rod completely enters the guide groove, the cut-off part of the anchor rod abuts against the other detection component The first baffle plate 64 on the member 6 abuts against and pushes the first rotating rod 62 to rotate so as to trigger the corresponding first travel switch 63. After both the first travel switches 63 are triggered, the driving assembly 4 starts and drives the second material guide plate 3 to rotate, so that the cut portion of the anchor rod falls into the material receiving frame 7 along the second material guide plate 3. After the cut portion of the anchor rod falls into the material receiving frame 7, the anchor rod is separated from the two first baffle plates 64 respectively. At this time, the two first baffle plates 64 are reset respectively under the action of the gravity they are subjected to and drive the first rotating rod 62 to reset. As the anchor rod continues to be transported, the driving assembly 4 can be intermittently triggered to turn over the second material guide plate 3 and pour each cut portion of the anchor rod into the material receiving frame 7, so that the cut anchor rods can be automatically collected in the material receiving frame 7. The automatic unloading device for anchor rod cutting provided in this embodiment realizes the automatic collection of the cut anchor rods, and the anchor rods are concentrated in the material receiving frame 7 to facilitate the subsequent transportation of the anchor rods to the next station for processing, which reduces the labor intensity of the workers and is conducive to improving the processing efficiency of the anchor rods.

[0027] like Figure 1 and Figure 2 As shown, two vertical support plates 11 are arranged at intervals on the frame 1, and the support plates 11 are respectively provided with first through holes, and mounting plates 21 are respectively arranged at both ends of the first material guide plate 2, and the mounting plates 21 are respectively provided with first mounting holes aligned with the first through holes. The mounting plates 21 can be fixed to the support plate 11 by passing bolts through the first through holes and the mounting holes and tightening with nuts, so as to fix the material blocking plate 71 to the frame 1, and a plurality of first through holes are arranged at intervals along the vertical direction on the support plate 11, and the height of the first material guide plate 2 can be adjusted by aligning the first mounting holes with the first through holes at different heights, thereby adjusting the height of the material guide trough 5 so that the automatic unloading device for anchor cutting can be adapted to different types of cutting equipment.

[0028] like Figure 3and Figure 4 As shown, a connecting rod 22 is provided on one side of the first material guide plate 2 close to the second material guide plate 3, a connecting portion 31 is provided on the second material guide plate 3, and a connecting hole matched with the connecting rod 22 is provided on the connecting portion 31. The first material guide plate 2 and the second material guide plate 3 are rotatably connected by the matching of the connecting rod 22 and the connecting hole, so that the second material guide plate 3 can smoothly rotate relative to the first material guide plate 2, ensuring that when the second material guide plate 3 is turned over, the anchor rod located in the material guide groove 5 can fall smoothly into the material receiving frame 7 under the guidance of the second material guide plate 3.

[0029] In this embodiment, a vertical threaded rod 23 and a locking nut 24 matching the threaded rod 23 are provided on the first material guide plate 2, a second mounting hole 66 for the threaded rod 23 to pass through is provided on the first bracket 61, and the locking nut 24 abuts against the first bracket 61 and presses the first bracket 61 onto the first material guide plate 2. When the detection component 6 is installed on the first material guide plate 2, the second mounting hole 66 is aligned with the threaded rod 23 and the threaded rod 23 is passed through the second mounting hole 66, and then the locking nut 24 is installed on the threaded rod 23 and abutted against the first bracket 61, so that the detection component 6 can be fixed on the first material guide plate 2, and a plurality of the threaded rods 23 are arranged on the first material guide plate 2 at intervals along the length direction of the material guide groove 5. The first bracket 61 is matched with the threaded rod 23 located at different positions to adjust the distance between the two detection components 6, so that the distance between the two detection components 6 matches the length of the cut-off part of the anchor rod, so that the anchor rod cutting automatic unloading device can collect anchor rods of various different lengths.

[0030] Please combine Figure 1 and Figure 2 The driving assembly 4 includes a cylinder 41 and a telescopic rod 42 disposed at the output end of the cylinder 41. The end of the cylinder 41 away from the telescopic rod 42 is rotatably connected to the frame 1, and the end of the telescopic rod 42 away from the cylinder 41 is rotatably connected to the second material guide plate 3. The cylinder 41 drives the telescopic rod 42 to extend or retract, and the cylinder 41 can drive the second material guide plate 3 to rotate relative to the first material guide plate 2. The cylinder 41 controls the moving direction of the telescopic rod 42 to control the rotation direction of the second material guide plate 3, so that the second material guide plate 3 is turned over or reset.

[0031] In detail, the end of the cylinder 41 away from the telescopic rod 42 is provided with a first connection block 43, the first connection block 43 is provided with a first rotation axis 44, the frame 1 is provided with a first mounting seat 12, and the first mounting seat 12 is provided with a first through hole matched with the first rotation axis 44. The rotation connection between the cylinder 41 and the frame 1 is achieved by the first rotation axis 44 provided on the first connection block 43 and the first through hole provided on the first mounting seat 12, ensuring that the cylinder 41 and the frame 1 are matched reliably, and when the cylinder 41 drives the telescopic rod 42 to move, it can rotate smoothly relative to the frame 1, ensuring the smooth operation of the driving assembly 4.

[0032] Optionally, the end of the telescopic rod 42 away from the cylinder 41 is provided with a second connection block 45, the second connection block 45 is provided with a second rotation axis 46, the second guide plate 3 is provided with a second mounting seat 32, and the second mounting seat 32 is provided with a second through hole matched with the second rotation axis 46. The second connection block 45 is provided at the end of the telescopic rod 42 away from the cylinder 41, and the second rotation axis 46 is provided on the second connection block 45, the second guide plate 3 is provided with a second mounting seat 32, and the second mounting seat 32 has a second through hole matched with the second rotation axis 46. The cooperation between the second rotation axis 46 and the second through hole ensures that the connection between the second guide plate 3 and the telescopic rod 42 is stable, which helps to improve the stability of the second guide plate 3 during the flipping action.

[0033] like Figure 1 and Figure 4 As shown, a first counterweight 65 is provided on the first baffle plate 64, and the first counterweight 65 is arranged near the end of the first baffle plate 64 away from the first rotating rod 62. The counterweight is arranged at the end of the first baffle plate 64 away from the second rotating rod 82 to increase the weight of the first baffle plate 64, so that the cut portion of the anchor rod falls into the material receiving frame 7 along the second material guide plate 3 and is separated from the first baffle plate 64, and the first baffle plate 64 can be quickly reset, which is conducive to improving the stability of the anchor rod cutting automatic unloading device during continuous operation.

[0034] Please assemble Figure 2 and Figure 5A monitoring component 8 is also provided on the first material guide plate 2, and the monitoring component 8 is located on a side of one of the detection components 6 away from the other detection component 6. The monitoring component 8 includes a second bracket 81 installed on the first material guide plate 2, a second rotating rod 82 rotatably connected to the second bracket 81, and a second travel switch 83 matched with the second rotating rod 82. The rotation axis of the second rotating rod 82 is perpendicular to the length direction of the material guide trough 5. A second baffle 84 is provided on the second rotating rod 82, and part of the second baffle 84 extends into the material guide trough 5. The monitoring component 8 is arranged at one end of the material guide trough 5 away from the cutting equipment, and the second stroke switch 83 is electrically connected to the cutting equipment. When the driving component 4 fails and the second material guide plate 3 cannot be flipped normally, the cut-off part of the anchor rod continues to move under the transportation of the cutting equipment until it abuts against the second baffle 84 and pushes the second baffle 84 to rotate. When the second baffle 84 rotates, it drives the second rotating rod 82 to rotate and triggers the second stroke switch 83. The second stroke switch 83 sends a signal to the cutting equipment that the automatic unloading device for cutting the anchor rod has failed. The cutting equipment suspends the transportation of the anchor rod to stop the cut-off part of the anchor rod from moving in the material guide trough 5 and sends an alarm to prompt the operator to handle it, thereby improving the reliability of the automatic unloading device for cutting the anchor rod.

[0035] Specifically, a second counterweight 85 is provided on the second baffle plate 84, and the second counterweight 85 is provided near an end of the second baffle plate 84 away from the second rotating rod 82. The second counterweight 85 provided on the second baffle plate is used to increase the mass of the second baffle plate 84, so that the second baffle plate 84 can be quickly reset and kept in the guide groove after the anchor rod is separated from the second baffle plate 84, thereby preventing the second baffle plate 84 from unexpected movement.

[0036] Please refer to Figure 1 and Figure 2 , vertical baffle plates 71 are respectively provided on opposite sides of the receiving frame 7, and the sides of the baffle plates 71 close to each other are respectively provided with guiding slopes 72, and the ends of the guiding slopes 72 away from the receiving frame 7 are inclined toward the outside of the receiving frame 7. The baffle plates 71 provided on the receiving frame 7 are used to block the anchor rods falling into the receiving frame 7 so that the anchor rods are kept in the receiving frame 7, and prevent the anchor rods from falling off from the receiving frame 7 during transportation, and the baffle plates 71 respectively have the guiding slopes 72 for guiding the anchor rods to fall, so as to prevent the anchor rods from falling out of the receiving frame 7 when they fall.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An automatic unloading device for anchor cutting, characterized in that: The invention relates to a frame, wherein a first fixed material guide plate is provided on the frame, a second material guide plate is rotatably connected to the first material guide plate, and the frame is also provided with a driving component which is transmission-connected to the second material guide plate, the first material guide plate and the second material guide plate form a material guide trough, two detection components are arranged at intervals on the first material guide plate, and the two detection components are respectively arranged near the opposite ends of the material guide trough, the detection component comprises a first bracket installed on the first material guide plate, a first rotating rod rotatably connected to the first bracket, and a first travel switch matched with the first rotating rod, the rotating axis of the first rotating rod is perpendicular to the length direction of the material guide trough, a first baffle is provided on the first rotating rod and a part of the first baffle extends into the material guide trough, and the first travel switch is electrically connected to the driving component; it also includes a material receiving frame, which is arranged near the second material guide plate and is located below the second material guide plate.

2. The automatic unloading device for anchor cutting according to claim 1, characterized in that: Two vertical support plates are spaced apart on the frame and first through holes are respectively provided on the support plates. Mounting plates are respectively provided at both ends of the first material guide plate and first mounting holes aligned with the first through holes are respectively provided on the mounting plates.

3. The automatic unloading device for anchor cutting according to claim 1, characterized in that: A connecting rod is provided on one side of the first material guide plate close to the second material guide plate, a connecting portion is provided on the second material guide plate, and a connecting hole matched with the connecting rod is provided on the connecting portion.

4. The automatic unloading device for anchor cutting according to claim 1, characterized in that: The driving assembly includes a cylinder and a telescopic rod arranged at the output end of the cylinder, one end of the cylinder away from the telescopic rod is rotatably connected to the frame, and one end of the telescopic rod away from the cylinder is rotatably connected to the second material guide plate.

5. The automatic bolt cutting device according to claim 4, characterized in that: A first connecting block is provided at one end of the cylinder away from the telescopic rod, a first rotating shaft is provided on the first connecting block, a first mounting seat is provided on the frame, and a first through hole matching the first rotating shaft is provided on the first mounting seat.

6. The automatic bolt cutting device according to claim 4, characterized in that: A second connecting block is provided at one end of the telescopic rod away from the cylinder, a second rotating shaft is provided on the second connecting block, a second mounting seat is provided on the second material guide plate, and a second through hole matching with the second rotating shaft is provided on the second mounting seat.

7. The automatic bolt cutting device according to claim 1, characterized in that: A first counterweight block is disposed on the first baffle plate, and the first counterweight block is disposed close to an end of the first baffle plate away from the first rotating rod.

8. The automatic unloading device for bolt cutting according to claim 1, characterized in that: A monitoring component is also provided on the first material guide plate, and the monitoring component is located on a side of one of the detection components away from the other detection component. The monitoring component includes a second bracket installed on the first material guide plate, a second rotating rod rotatably connected to the second bracket, and a second travel switch matched with the second rotating rod, the rotating axis of the second rotating rod is perpendicular to the length direction of the material guide trough, the second rotating rod is provided with a second baffle and part of the second baffle extends into the material guide trough.

9. An automatic bolt cutting device as claimed in claim 8, characterized in that: A second counterweight block is disposed on the second baffle plate, and the second counterweight block is disposed close to an end of the second baffle plate away from the second rotating rod.

10. The automatic unloading device for anchor cutting according to claim 1, characterized in that: Vertical material baffle plates are respectively arranged on opposite sides of the material receiving frame, and the mutually close sides of the material baffle plates respectively have guiding inclined surfaces, and the ends of the guiding inclined surfaces away from the material receiving frame are inclined toward the outside of the material receiving frame.

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