CN111015133B

CN111015133B - Processing technology and equipment for pressing plate for fixing blade

Info

Publication number: CN111015133B
Application number: CN201911417585.6A
Authority: CN
Inventors: 陈君华; 陈金红; 陈秀丽
Original assignee: Jiangsu Husiba Intelligent Technology Co ltd
Current assignee: Jiangsu Husiba Intelligent Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2021-08-03
Anticipated expiration: 2039-12-31
Also published as: CN111015133A

Abstract

The invention discloses a processing technology and equipment for fixing a pressing plate of a blade, wherein the processing technology comprises six processing steps of blank vehicle type, cutting and polishing, punching, slotting, heat treatment and carburizing and heat treatment and quenching, the equipment used in the punching step comprises a punching machine body, the punching machine body comprises a workbench and an installation frame arranged above the workbench, a punching part is arranged on one side of the installation frame facing the workbench, a hydraulic cylinder used for driving the punching part to lift is arranged on the installation frame, the punching part comprises a cake-shaped connecting block and a first cylindrical punching head and a second cylindrical punching head which are fixedly connected to one side of the connecting block facing the workbench, the circle centers of the first punching head and the second punching head are positioned on a circle concentric with the connecting block, and the connecting block and a telescopic rod of the hydraulic cylinder are detachably connected. The invention has the effect of improving the working strength and the processing efficiency of the pressing plate.

Description

Processing technology and equipment for pressing plate for fixing blade

Technical Field

The invention relates to the technical field of workpiece processing, in particular to a processing technology and equipment for a pressing plate for fixing a blade.

Background

(refer to fig. 1 and 2) a pressing plate for fixing a blade, which is directly formed by injection molding, but the pressing plate processed by the processing method has poor structural strength, is easy to crack in the using process and has short service life. In order to improve the structural strength of the pressure plate, the workpiece is subjected to carburizing treatment in the machining process, wherein the carburizing refers to a process of enabling carbon atoms to penetrate into a steel surface layer, so that the surface layer of the workpiece has high hardness and wear resistance. Therefore, the invention aims to provide a processing technology of a pressure plate for fixing a blade and equipment for the processing technology, which can realize basic processing of a pressure plate workpiece, and simultaneously carry out stamping processing of a second through hole and stamping processing of a counter bore of the workpiece in sequence before carburization on the workpiece, thereby being beneficial to improving the processing efficiency.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a processing technology and equipment for fixing a pressing plate of a blade.

The technical purpose of the invention is realized by the following technical scheme: a processing technology of a pressing plate for fixing a blade comprises the following processing steps:

blank vehicle type: preliminarily processing the blank into the shape of a workpiece;

cutting and polishing: cutting a workpiece into a required shape and size by cutting, and polishing the surface of the workpiece by a polisher to form a polished surface required by processing on the surface of the workpiece;

punching: firstly punching the workpiece by a punching machine to form a second through hole on the workpiece along the thickness direction, and then punching the upper surface and the lower surface of the workpiece to form a counter bore on the workpiece, wherein the axis of the counter bore is superposed with the axis of the second through hole; -

Grooving: grooving the back of the workpiece through a grooving machine, wherein the groove opening is intersected with the second through hole and the counter bore;

heat treatment and carburization, namely putting the workpiece into a carburizing furnace for carburization, cooling and tempering after carburization, and then discharging the workpiece out of the furnace and putting down the workpiece;

and (3) heat treatment quenching: and cleaning the carburized workpiece again, removing surface stains, and then quenching to obtain a finished product of the press plate.

Through the technical scheme, the pressing plate is produced and processed through six processing steps of blank vehicle type, cutting and polishing, punching, slotting, heat treatment and carburizing and heat treatment and quenching in sequence, so that a carburized layer is formed on the surface of the pressing plate, the structural strength of the pressing plate is improved, and the service life of the pressing plate is prolonged; in the process, the punching machine is used for sequentially punching the second through hole and the counter bore on the workpiece, so that the machining efficiency is improved.

The second technical purpose of the invention is realized by the following technical scheme: the utility model provides an equipment that is arranged in the manufacturing process of fixed blade's clamp plate, includes the punching machine body, the punching machine body includes the workstation and sets up the mounting bracket above the workstation, one side that the mounting bracket is towards the workstation is equipped with the stamping workpiece, be equipped with the pneumatic cylinder that is used for driving the stamping workpiece to go up and down on the mounting bracket, the stamping workpiece includes the connecting block of cake form and rigid coupling at the first punching head of the column of connecting block towards workstation one side, second punching head, wherein the centre of a circle of first punching head and second punching head is located the concentric circle with the connecting block, one side that the telescopic link of connecting block and pneumatic cylinder is relative is connected with first sleeve and second sleeve respectively, first sleeve cover is established in the outside of second sleeve and coaxial with the second sleeve, radially set up the first through-hole that link up mutually on first sleeve and the second sleeve, two sets of first screw rods are arranged in the first through holes on the first sleeve and the second sleeve in a penetrating mode, and first nuts are connected to two ends of each first screw rod in a threaded mode.

According to the technical scheme, during stamping, the first stamping head corresponds to the pressing plate, then the hydraulic cylinder drives the first stamping head to descend in position, second through hole stamping is conducted on a workpiece, then an operator detaches the first nut and the first screw from the first sleeve and the second sleeve, then the connecting block and the first sleeve are rotated, the axis of the second stamping head is enabled to be coincident with the axis of the second through hole in the workpiece, the first screw penetrates through the first sleeve and the second sleeve, the first nut is screwed on, and then the hydraulic cylinder drives the second stamping head to conduct counter hole stamping on the workpiece; the arrangement is adopted, so that when the workpiece is punched and processed by the second through hole and the counter bore, the workpiece does not need to be sequentially transferred to two punching machines for punching and processing, the punching efficiency is improved, the punching and processing of the second through hole and the counter bore can be realized by only one punching machine, and the occupation of the equipment on the space in a workshop is reduced.

The invention is further configured to: the utility model discloses a punching machine, including workstation, conveyer belt, clamping piece, workstation, mounting panel and conveyer belt, the below of workstation is equipped with first support frame, it is equipped with the live-rollers and drives the rotatory servo motor of live-rollers to rotate on the first support frame, be equipped with the conveyer belt between the live-rollers, the conveyer belt is around establishing the outside at the workstation, just the conveyer belt deviates from the first punching press head one side and laminates mutually with the mesa of workstation, the conveyer belt has the mounting panel towards one side rigid coupling of first punching press head, one side that the mounting panel deviates from the conveyer belt evenly is provided with the clamping piece that the multiunit is used for the centre gripping work piece along length direction, the blanking mouth that link up mutually has all been seted up on workstation, mounting panel and the conveyer belt.

Through above-mentioned technical scheme, at the in-process that carries out stamping process, press from both sides tightly fixedly to a plurality of work pieces through the multiunit clamping piece to convey the work piece through servo motor drive conveyer belt, realize carrying out continuous stamping process to a plurality of work pieces in proper order, be favorable to improving the efficiency of processing.

The invention is further configured to: the clamping piece includes fixed connection's first clamp splice on the mounting panel and slides the second clamp splice of connection on the mounting panel, it has the fixed block to deviate from one side rigid coupling of first clamp splice at the second clamp splice on the workstation, wear to be equipped with the second screw rod on the fixed block, the second screw rod is towards the one end welded fastening of second clamp splice on the second clamp splice, just there is the second nut, two in the equal threaded connection in both sides of second clamp splice on the second screw rod the second nut is contradicted respectively in the both sides of second clamp splice.

Through above-mentioned technical scheme, it is regularly to press from both sides the fastening to the work piece, and the operator places the work piece between first clamp splice and second clamp splice, and the operator removes two second nuts towards the direction of keeping away from the second clamp splice after that to contradict the second clamp splice in the outside of work piece through the second screw rod, it is fixed to screw up two second nuts towards the direction that is close to the second clamp splice again, thereby presss from both sides the fastening with the work piece fixedly, and easy operation is convenient.

The invention is further configured to: and a first rubber layer is fixedly arranged on one side of the first clamping block opposite to the second clamping block.

Through above-mentioned technical scheme, the setting of first rubber layer is favorable to increasing the frictional resistance between work piece and first clamp splice and the second clamp splice to be favorable to increasing the stability of first clamp splice and second clamp splice to the work piece centre gripping.

The invention is further configured to: the material receiving plate is arranged between the conveyor belts and below the workbench and used for receiving waste materials falling from the blanking port, the second support frame is arranged below the workbench, and the material receiving plate is supported and placed on the second support frame.

Through above-mentioned technical scheme, the waste material that produces among the stamping process falls down through the blanking mouth, connects the flitch to accept the collection to the waste material, is convenient for carry out recycle to the waste material, has also reduced the waste material and has fallen to strike on the conveyer belt and cause the possibility of damage to the conveyer belt.

The invention is further configured to: the material receiving plate is arc-shaped and is sunken towards the mounting plate.

Through above-mentioned technical scheme, connect the flitch to be the curved surface towards one side of mounting panel, impact force has played the cushioning effect on the waste material that falls down through the blanking mouth impact, has reduced when the waste material falls the impact force of butt joint flitch too big and lead to the fact the possibility of damaging to the flitch.

The invention is further configured to: the inner side of the material receiving plate is provided with a second rubber layer, and a compression spring is fixedly arranged between the second rubber layer and the inner side wall of the material receiving plate.

Through above-mentioned technical scheme, second rubber layer and compression spring have elastic restoring force when receiving pressure, have played the cushioning effect to the impact force that receives on the waste material, have further reduced when the waste material falls the impact force of butt joint flitch too big and the possibility that causes the damage to the flitch, also be favorable to reducing the waste material simultaneously and fall the noise that produces on the flitch that connects.

In conclusion, the invention has the following beneficial effects:

1. the workpiece is punched on the same punching machine body, the workpiece is not required to be punched in the process of carrying out second through hole punching and counter hole punching, and the machining efficiency is improved;

2. the conveying belt is additionally arranged to convey a plurality of workpieces, so that the workpieces clamped and fixed on the mounting plate are sequentially subjected to continuous stamping, and the processing efficiency is further improved.

Drawings

Fig. 1 is a schematic structural view for embodying the front surface of a workpiece.

Fig. 2 is a schematic structural view for embodying the bottom surface of the workpiece.

Fig. 3 is a schematic structural view for embodying the punch body.

Fig. 4 is an enlarged view of a portion a in fig. 3.

Fig. 5 is a schematic structural view for embodying the stamping.

Fig. 6 is a schematic structural view for embodying the second support frame and the receiving plate disposed below the blanking port.

Reference numerals: 1. a punch body; 11. a work table; 111. a mounting frame; 112. a hydraulic cylinder; 1121. a second sleeve; 12. stamping parts; 121. connecting blocks; 1211. a first sleeve; 1212. a first through hole; 1213. a first screw; 1214. a first nut; 122. a first punch; 123. a second punch; 13. a first support frame; 131. a conveyor belt; 1311. mounting a plate; 1312. a blanking port; 132. a rotating roller; 133. a clamping member; 1331. a first clamping block; 1332. a second clamp block; 1333. a fixed block; 1334. a second screw; 1335. a second nut; 1336. a first rubber layer; 134. a servo motor; 14. a second support frame; 141. a material receiving plate; 142. a second rubber layer; 143. a compression spring; 2. a workpiece; 21. a second through hole; 22. a counterbore.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows: a processing technology of a pressing plate for fixing a blade comprises the following processing steps:

punching: firstly punching the workpiece by a punching machine to form a second through hole with the diameter of 1cm and the length of 3cm on the workpiece along the thickness direction, and then punching the upper surface and the lower surface of the workpiece to form a counter bore on the workpiece, wherein the diameter of the counter bore is 2cm, the length of the counter bore is 1cm, and the axial lead of the counter bore is superposed with the axial lead of the second through hole;

grooving: grooving the back of the workpiece by a grooving machine, wherein the notch is intersected with the second through hole and the counter bore, the part of the notch, which is intersected with the second through hole and the counter bore, accounts for 1.1cm in diameter and 1cm in depth of the counter bore, accounts for 0.1cm in diameter and 2cm in depth of the second through hole,

punching: firstly punching the workpiece by a punching machine to form a second through hole on the workpiece along the thickness direction, and then punching the upper surface and the lower surface of the workpiece to form a counter bore on the workpiece, wherein the axis of the counter bore is superposed with the axis of the second through hole;

the heat treatment carburizing step in this example is:

s1: charging into a furnace for carburizing: putting a workpiece and a sample into a carburizing furnace simultaneously by a travelling crane, controlling the furnace pressure to be constant at 0.6-0.7Kpa, raising the temperature in the carburizing furnace, adding nitrogen and propane into the furnace in the process of raising the temperature, wherein the ratio of the nitrogen to the propane is 1.1: 1, carburizing at 930 ℃ for 77h, and sequentially dividing the carburizing time into 18h of strong carburizing (carbon potential of 1.02% C), 16h of diffusion (carbon potential of 0.85% C), 15h of strong carburizing (carbon potential of 1.02% C), 10h of diffusion (carbon potential of 0.75% C), 12h of diffusion (carbon potential of 0.75% C) and the highest carbon potential in the furnace of 1.02% C, and then forcibly cooling the temperature in the furnace to 840 ℃ so that the workpiece is cooled in the furnace for 2 h;

s2: discharging to a slow cooling pit: taking out the workpiece and the sample from the furnace, putting the workpiece and the sample into a slow cooling pit, slowly cooling for 5 hours, wherein the temperature in the slow cooling pit is 100 ℃, and simultaneously filling nitrogen gas serving as protective gas into the slow cooling pit;

s3: high-temperature tempering: placing the workpiece and the sample in a carburizing furnace, controlling the temperature at 650 ℃ and the time at 6.25h, then cooling the temperature in the furnace to 450 ℃, taking the workpiece and the sample out of the furnace, carrying out performance detection on the sample, and carrying out the next process step on the sample and the workpiece after the detection is qualified;

and (3) heat treatment quenching: cleaning the carburized workpiece again to remove surface stains, and then quenching to obtain a press plate product;

in this embodiment, the heat treatment quenching step is:

s1: placing the workpiece into a quenching furnace for oil cooling, controlling the oil temperature at 50 ℃ and the oil cooling time at 55min, taking out a sample for detection after quenching is finished, and performing the next process step on the sample and the workpiece after the detection is qualified;

s2: secondary tempering: and (3) placing the workpiece and the sample into a heating furnace for heating for 20 hours, controlling the temperature in the heating furnace to be 180 ℃, taking out the workpiece and the sample for air cooling, finally performing final inspection on the sample, and outputting that the workpiece is qualified after the detection is qualified.

Example two: referring to fig. 3, the equipment for the machining process of the pressing plate for fixing the blade disclosed by the invention comprises a punching machine body 1, wherein the punching machine body 1 comprises a workbench 11 and a mounting frame 111, the mounting frame 111 is located above the workbench 11 and welded on the workbench 11, the mounting frame 111 is arranged along the length direction of the workbench 11, a stamping part 12 is arranged on one side, facing the workbench 11, of the mounting frame 111, and a hydraulic cylinder 112 for driving the stamping part 12 to lift is arranged on the mounting frame 111.

Referring to fig. 3, a first support frame 13 is arranged below the workbench 11, the first support frame 13 is placed on the ground, a rotating roller 132 and a servo motor 134 for driving the rotating roller 132 to rotate are rotatably arranged on the first support frame 13, a conveyor belt 131 is arranged between the rotating rollers 132, the conveying direction of the conveyor belt 131 is the same as the length direction of the workbench 11, the conveyor belt 131 is wound on the outer side of the workbench 11, one side of the conveyor belt 131 departing from the first punching head 122 is attached to the table top of the workbench 11, and a mounting plate 1311 is bonded to one side of the conveyor belt 131 facing the first support frame 13 along the length direction.

Referring to fig. 3 and 4, five sets of clamping members 133 for clamping a workpiece 2 (fig. 1) are arranged on a side of the mounting plate 1311 facing away from the conveyor belt 131, the five sets of clamping members 133 are uniformly arranged along a length direction of the mounting plate 1311, each clamping member 133 includes a first clamping block 1331 and a second clamping block 1332, the first clamping block 1331 is welded on the mounting plate 1311, the second clamping block 1332 is connected on the mounting plate 1311 in a sliding manner, a first rubber layer 1336 is bonded on a side of the first clamping block 1331 opposite to the second clamping block 1332, a fixing block 1333 is bonded on the mounting plate 1311 on a side of the second clamping block 1332 facing away from the first clamping block 1331, a second screw 1334 is penetrated on the fixing block 1333, one end of the second screw 1334 facing the second clamping block 1332 is welded and fixed on the second clamping block 1332, and second nuts 1335 are respectively screwed on the second screw 1334 at both sides of the second clamping block 1332, and the two second nuts 1335 are respectively butted against both sides of the second clamping block 1332. The workbench 11, the mounting plate 1311 and the conveyor belt 131 are all provided with a through blanking port 1312, the workbench 11 is provided with a blanking port 1312 below the stamping part 12, and the mounting plate 1311 and the conveyor belt 131 are provided with a blanking port 1312 between each group of first clamping blocks 1331 and each group of second clamping blocks 1332.

Referring to fig. 3 and 4, before performing the punching work, an operator places five workpieces 2 (fig. 1) between the first clamping block 1331 and the second clamping block 1332, screws the two second nuts 1335 in a direction away from the second clamping block 1332, and pushes the second clamping block 1332 against the outer side of the workpiece 2 by the second screw 1334, so that the workpiece 2 is clamped between the first clamping block 1331 and the second clamping block 1332, and then screws the two second nuts 1335 in a direction close to the second clamping block 1332. The setting of multiunit clamping piece 133 and conveyer belt 131 can realize multiunit work piece 2 and convey in stamping process to be convenient for carry out the punching press in succession to multiunit work piece 2, be favorable to improving machining efficiency.

Referring to fig. 3 and 5, the stamping part 12 includes a connection block 121, and first and second columnar stamping heads 122 and 123, the connection block 121 is in a circular cake shape, the diameter of the first stamping head 122 is 1cm, the length of the first stamping head is 3cm, the diameter of the second stamping head 123 is 2cm, the length of the second stamping head is 1cm, the first and second stamping heads 122 and 123 are disposed toward the workbench 11, and the centers of the first and second stamping heads 122 and 123 are located on the concentric center of the connection block 121.

Referring to fig. 3 and 5, a first sleeve 1211 is welded on one side of the connecting block 121 away from the first stamping head 122, a second sleeve 1121 is coaxially connected to an output end of the hydraulic cylinder 112, the second sleeve 1121 is coaxially inserted into the first sleeve 1211, a first through hole 1212 that penetrates through the first sleeve 1211 and the second sleeve 1121 in the radial direction is formed in the first sleeve 1211, and two sets of first through holes 1212 are formed in the first sleeve 1211 at the same height.

Referring to fig. 3 and 5, when the second through hole 21 (fig. 1) is punched on the workpiece 2 (fig. 1), the first punch 122 corresponds to the workpiece 2 in the vertical direction, a group of first through holes 1212 of the first sleeve 1211 and the first through holes 1212 of the second sleeve 1121 simultaneously penetrate through first screws 1213, and both ends of the first screws 1213 are in threaded connection with first nuts 1214; when the counterbore 22 (fig. 1) is punched on the workpiece 2, the first screw 1213 and the first nut 1214 are detached, the first sleeve 1211 is rotated, so that another group of first through holes 1212 on the first sleeve 1211 corresponds to the first through holes 1212 on the second sleeve 1121, and then the first sleeve 1211 and the second sleeve 1121 are fixed in position by the first screw 1213 and the first nut 1214, and at this time, the axial line of the second punching head 123 coincides with the axial line of the second through hole 21 on the workpiece 2. In the punching process, the hydraulic cylinder 112 drives the connecting block 121 to ascend and descend, so that the first punching head 122 and the second punching head 123 punch the connecting block 121.

Referring to fig. 6, a second supporting frame 14 is arranged below the workbench 11 between the conveyor belts 131, the second supporting frame 14 is supported on the ground, the top end of the second supporting frame 14 extends to the space between the conveyor belts 131, an arc-shaped receiving plate 141 is placed on the second supporting frame 14, the receiving plate 141 is vertically positioned right below the blanking port 1312 on the workbench 11, the receiving plate 141 is recessed towards the mounting plate 1311, a second rubber layer 142 is arranged on the inner side of the receiving plate 141, a compression spring 143 is fixedly arranged between the second rubber layer 142 and the inner side wall of the receiving plate 141, and two ends of the compression spring 143 are respectively bonded to one side of the second rubber layer 142 opposite to the receiving plate 141. Waste materials generated in the stamping process are impacted and fall onto the second rubber layer 142 through the blanking port 1312, so that the waste materials are collected on the material receiving plate 141, and the waste materials are convenient to recycle; meanwhile, the second rubber layer 142 and the compression spring 143 have elastic buffer force, and buffer the impact force of the waste material impacting the material receiving plate 141.

The implementation principle of the embodiment is as follows: when the workpiece 2 is punched, an operator firstly clamps and fixes the workpiece 2 through the clamping piece 133, at this time, the first punching head 122 corresponds to the workpiece 2 in the vertical direction, then the hydraulic cylinder 112 drives the first punching head 122 to punch the workpiece 2, so that the workpiece 2 is formed with the second through hole 21 with the diameter of 1cm and the depth of 3cm, then the conveyor belt 131 conveys the workpiece 2, so that the next workpiece 2 is punched with the second through hole 21, and the generated waste falls onto the receiving plate through the blanking port 1312; after the workpiece 2 on the mounting plate 1311 is completely punched by the second through hole 21, the operator adjusts the position of the connecting block 121 so that the axis of the second punch 123 coincides with the axis of the second through hole 21 on the workpiece 2, then the hydraulic cylinder 112 drives the second punch 123 to punch the workpiece 2 so that a counterbore 22 with a diameter of 2cm and a depth of 1cm is formed on the workpiece 2, and then the conveyor belt 131 conveys the workpiece 2 in the opposite direction, thereby punching the counterbore 22 on the next workpiece 2. In the actual processing process, after the stamping processing is finished, the operator turns the workpiece 2 by one hundred eighty degrees, and performs stamping processing on the counter bore 22 on the other surface of the workpiece 2.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. A processing technology of a pressure plate for fixing a blade is characterized by comprising the following processing steps:

2. The apparatus for use in a process of machining a platen for fixing blades of claim 1, wherein: including punching machine body (1), punching machine body (1) includes workstation (11) and sets up mounting bracket (111) in workstation (11) top, mounting bracket (111) are equipped with stamping workpiece (12) towards one side of workstation (11), be equipped with pneumatic cylinder (112) that are used for driving stamping workpiece (12) to go up and down on mounting bracket (111), stamping workpiece (12) are including connecting block (121) and the rigid coupling of cake form on connecting block (121) towards first punching press head (122), the second punching press head (123) of the column of workstation (11) one side, wherein the centre of a circle of first punching press head (122) and second punching press head (123) is located with the concentric circle of connecting block (121), the relative one side of the telescopic link of connecting block (121) and pneumatic cylinder (112) is connected with first sleeve (1211) and second sleeve (1121) respectively, first sleeve (1211) cover is established in the outside of second sleeve (1121) and is coaxial with second sleeve (1121) The first sleeve (1211) and the second sleeve (1121) are provided with first through holes (1212) which are communicated with each other along the radial direction, the first sleeve (1211) is provided with two groups, first screw rods (1213) are simultaneously arranged in the first through holes (1212) of the first sleeve (1211) and the second sleeve (1121) in a penetrating manner, and two ends of each first screw rod (1213) are in threaded connection with first nuts (1214);

a first support frame (13) is arranged below the workbench (11), a rotating roller (132) and a servo motor (134) for driving the rotating roller (132) to rotate are rotatably arranged on the first support frame (13), a conveyor belt (131) is arranged between the rotating rollers (132), the conveyor belt (131) is wound on the outer side of the workbench (11), and one side of the conveyor belt (131) departing from the first punching head (122) is attached to the table top of the workbench (11), a mounting plate (1311) is fixedly connected to one side of the conveyor belt (131) facing the first punching head (122), a plurality of groups of clamping pieces (133) used for clamping the workpiece (2) are uniformly arranged on one side of the mounting plate (1311) departing from the conveyor belt (131) along the length direction, the workbench (11), the mounting plate (1311) and the conveyor belt (131) are all provided with through blanking ports (1312);

the clamping piece (133) comprises a first clamping block (1331) fixedly connected to the mounting plate (1311) and a second clamping block (1332) connected to the mounting plate (1311) in a sliding mode, a fixed block (1333) is fixedly connected to one side, away from the first clamping block (1331), of the second clamping block (1332) on the workbench (11), a second screw rod (1334) penetrates through the fixed block (1333), one end, facing the second clamping block (1332), of the second screw rod (1334) is welded and fixed to the second clamping block (1332), second nuts (1335) are connected to two sides of the second clamping block (1332) on the second screw rod (1334) in a threaded mode, and the two second nuts (1335) abut against two sides of the second clamping block (1332) respectively;

a first rubber layer (1336) is fixedly arranged on one side of the first clamping block (1331) opposite to one side of the second clamping block (1332);

a material receiving plate (141) used for receiving waste materials falling from the blanking port (1312) is arranged below the workbench (11) between the conveyor belts (131), a second support frame (14) is arranged below the workbench (11), and the material receiving plate (141) is supported and placed on the second support frame (14);

the material receiving plate (141) is arranged in an arc shape, and the material receiving plate (141) is sunken towards the direction of the mounting plate (1311);

the inner side of the material receiving plate (141) is provided with a second rubber layer (142), and a compression spring (143) is fixedly arranged between the second rubber layer (142) and the inner side wall of the material receiving plate (141).