CN109878136B

CN109878136B - Automatic liftout press

Info

Publication number: CN109878136B
Application number: CN201910246537.9A
Authority: CN
Inventors: 王忠祥
Original assignee: Shengzhou Jingye Electromechanical Technology Co ltd
Current assignee: Changzhou Lingcui New Material Technology Co ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2021-04-23
Anticipated expiration: 2039-03-29
Also published as: CN109878136A

Abstract

The invention relates to the technical field of presses. Aim at provides one kind can improve automatic liftout press of automatic level. The technical scheme adopted by the invention is as follows: an automatic material ejecting press machine comprises a frame, wherein a workbench is arranged on the top surface of the frame along the length direction of the frame, the top of the front section of the workbench forms an extrusion area, and the top of the rear section of the workbench forms a feeding area; a die hole is formed in the top surface of the workbench of the extrusion area, an extrusion device is arranged above the extrusion area, and an ejection device is arranged below the extrusion area; the workbench is also provided with a feeding device; the ejection device comprises an ejector rod and an jacking mechanism used for driving the ejector rod, wherein the ejector rod consists of a rod body and an end head arranged at the upper end of the rod body. The automatic ejection mechanism can automatically eject the extruded product without manual participation, and has higher automation level.

Description

Automatic liftout press

Technical Field

The invention relates to the technical field of presses, in particular to an automatic material ejecting press.

Background

The press is a main device for forming powdery materials, and can be used for press forming of ceramic powder, metal powder and rubber powder. The traditional press for molding the powdery material mainly comprises a workbench, wherein a template is arranged on the workbench, and a die hole is formed in the template; a pressure head is arranged above the workbench, and an upper die is arranged on the pressure head. During the use, the staff is with the manual feeding of powdered raw materials in the nib, then the pressure head descends, goes up the mould and stretches into in the nib and press the shaping to raw and other materials. However, the traditional powdery raw material press has poor automation level in the use process, and the implementation of mass production is greatly influenced. And because manual participation is needed, the press belongs to a machine with certain danger, great potential safety hazard is caused during feeding and taking materials, and once the operation is not very serious, serious consequences are easy to cause.

Disclosure of Invention

The invention aims to provide an automatic ejection press capable of improving the automation level.

In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: an automatic material ejecting press machine comprises a frame, wherein a workbench is arranged on the top surface of the frame along the length direction of the frame, the top of the front section of the workbench forms an extrusion area, and the top of the rear section of the workbench forms a feeding area; a die hole is formed in the top surface of the workbench of the extrusion area, an extrusion device for extruding materials in the die hole is arranged above the extrusion area, and an ejection device for ejecting a product extruded in the die hole is arranged below the extrusion area; the workbench is also provided with a feeding device which can reciprocate along the length direction of the workbench and is used for feeding powder materials into the die holes and pushing the ejected products out of the die holes;

the ejection device comprises an ejector rod and an jacking mechanism for driving the ejector rod, wherein the ejector rod consists of a rod body and an end head arranged at the upper end of the rod body; the bottom of the die hole is provided with a step-shaped rod hole which vertically penetrates through the workbench and the rack, the upper section of the rod hole is matched with the end of the ejector rod, the lower section of the rod hole is matched with the rod body of the ejector rod, and the ejector rod is arranged in the rod hole in a penetrating manner; the jacking mechanism comprises a top plate and a rotating shaft, and the top plate is positioned below the ejector rod and fixedly connected with the lower end of the ejector rod; the rotating shaft is positioned below the top plate, a plurality of cams are uniformly arranged on the circumferential surface of the rotating shaft along the length direction of the rotating shaft, and the cams are in contact with the top plate; one end of the rotating shaft is connected with the output end of a second stepping motor, and the second stepping motor is fixedly arranged at the bottom of the rack.

Preferably, the number of the rotating shafts is two, the two rotating shafts are symmetrically distributed below two sides of the top plate, and the two rotating shafts are in transmission connection through a gear set.

Preferably, two ends of the rotating shaft are installed in bearing seats through bearings, and the bearing seats are fixed on the bottom surface of the frame.

Preferably, the top plate is square, four corners of the top plate are respectively provided with a positioning hole, a positioning rod penetrates through each positioning hole, the positioning rods are matched with the positioning holes to form sliding connection, the upper ends of the positioning rods are fixedly connected with the rack, and the lower ends of the positioning rods are provided with limiting heads.

Preferably, the feeding device comprises a feeding frame and a driving assembly, the feeding frame is positioned on the workbench and comprises an inner frame and an outer frame, the inner frame and the outer frame are both in a vertical cylindrical shape, a circle of annular mounting groove is formed in the peripheral surface of the middle part of the inner frame, the outer frame is matched with the mounting groove and clamped in the mounting groove, and the inner frame and the outer frame form rotating fit; the outer frame is connected with the driving assembly and can reciprocate between the extrusion area and the feeding area under the driving of the driving assembly; a plurality of scrapers extending along the radial direction of the inner frame are uniformly arranged on the inner side wall of the inner frame, and the edge of the bottom of each scraper is in contact with the upper surface of the workbench; the inner frame is characterized in that a circle of toothed ring is further arranged on the circumferential surface of the top of the inner frame, a rack is arranged on the workbench along the length direction of the workbench, and the rack is meshed with the toothed ring.

Preferably, the number of the scrapers is at least three, and the inner ends of the scrapers are connected through a connecting ring.

Preferably, the driving assembly comprises a screw rod and a guide rod which are arranged on two sides of the feeding frame, the screw rod and the guide rod both extend along the length direction of the workbench, and one end of the screw rod is connected with the output end of the first stepping motor; the guide rod and the screw rod are respectively sleeved with a sliding block, the sliding block on the guide rod is in sliding fit with the guide rod, and the sliding block on the screw rod is in threaded fit with the screw rod; the material loading frame is located between the sliding blocks, and the sliding blocks are fixedly connected with the middle of the outer frame through short rods towards one side of the material loading frame.

Preferably, one side of the loading frame, which is back to the loading area, is also provided with a discharging push plate, the discharging push plate extends along the width direction of the workbench, and the discharging push plate is connected with the outer frame of the loading frame through a connecting rod.

Preferably, the end part of the rear section of the workbench is further provided with a discharging assembly, the discharging assembly comprises a discharging channel which extends downwards in an inclined mode along the direction far away from the workbench and gradually becomes smaller, a discharging hole is formed in the bottom of the lower end of the discharging channel and is connected with one end of the cloth bag channel, and the other end of the cloth bag channel extends into the collecting box.

Preferably, the extrusion device comprises four guide upright columns symmetrically arranged on the machine frame at two sides of the extrusion area, and the top ends of the guide upright columns are fixedly provided with top frames; a hydraulic cylinder is arranged on the top frame; the extrusion device also comprises a square lifting platform, and four corners of the lifting platform are sleeved on the guide upright post and form sliding fit with the guide upright post; the top surface of the lifting platform is connected with the output end of the hydraulic cylinder, the bottom of the lifting platform is provided with an extrusion head, and the extrusion head is provided with an extrusion lug matched with the die hole.

The beneficial effects of the invention are concentrated and expressed as follows: the product after extrusion can be automatically ejected out without manual participation, and the automation level is higher. Specifically, in the using process of the ejection device, the second stepping motor drives the rotating shaft to rotate, the cam on the rotating shaft can drive the top plate to move up and down in the rotating process, and the top plate drives the ejector rod to move up and down. And after the extrusion is finished, ejecting the product by the ejector rod, pushing the product out of the die hole by the feeding device, and finishing the material filling of the die hole again. Compared with the traditional press machine, the invention can greatly improve the production efficiency, does not need workers to stretch hands below the extruding device for operation, has excellent safety and avoids safety accidents.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of the table;

FIG. 3 is a schematic structural diagram of a loading frame;

FIG. 4 is a schematic view of the internal structure of the loading frame;

fig. 5 is an enlarged view of a portion a in fig. 1.

Detailed Description

The automatic material ejecting press machine shown in the combined drawings of fig. 1-5 comprises a frame 1, wherein a workbench 2 is arranged on the top surface of the frame 1 along the length direction of the frame 1, and the workbench 2 is used as a place for carrying out the process steps of loading, unloading, extruding and the like. The top of the front section of the workbench 2 forms an extrusion area, and the top of the rear section forms a feeding area, as shown in fig. 1, the front section is a left section, and the rear section is a right section. The top surface of the workbench 2 of the extrusion area is provided with a die hole 3, and the die hole 3 is actually a formed cavity and is displayed by extruding the raw material in the die hole 3. The nib 3 can directly be seted up on workstation 2, certainly to different products, for nimble change, nib 3 also can set up on the bed die, and the bed die can be dismantled by workstation 2 and connect, but need guarantee the top surface height of bed die and 2 top surface height parallel and level of workstation.

The extrusion device for extruding the material in the die hole 3 is arranged above the extrusion area, and the specific form of the extrusion device is more, such as: can set up the roof-rack in the top in extrusion district, the fixed cylinder that sets up on the roof-rack, the output of cylinder is down and set up the pressure head, and the powder material in the die hole 3 can be carried out extrusion to the cylinder drive pressure head. Of course, the ram can also be driven by a motor in cooperation with a crank-link mechanism, but this case is generally the case when the pressing pressure requirement is small. In addition, the extrusion device can also adopt a four-column extrusion device as shown in fig. 1, that is, the extrusion device comprises four guide columns 21 symmetrically arranged on the machine frame 1 at two sides of the extrusion area, and the top ends of the guide columns 21 are fixedly provided with top frames 22. And a hydraulic cylinder 23 is arranged on the top frame 22, and the output end of the hydraulic cylinder 23 faces downwards. The extrusion device further comprises a square lifting platform 24, wherein four corners of the lifting platform 24 are sleeved on the guide upright post 21, are in sliding fit with the guide upright post 21, and can be lifted along the guide upright post 21. The top surface of the lifting platform 24 is connected with the output end of the hydraulic cylinder 23, the bottom of the lifting platform 24 is provided with an extrusion head 25, and the extrusion head 25 is provided with an extrusion convex block matched with the die hole 3. The extrusion device with the structure has good stability and large extrusion force, and is suitable for extruding materials with higher molding pressure.

An ejection device for ejecting the product extruded in the die hole 3 is arranged below the extrusion area. The ejection device is retracted below the die hole 3 when the extrusion device extrudes, and can be ejected after the extrusion device is lifted, so that a product is ejected out of the die hole 3. The simplest ejection device can be an electric push rod arranged at the bottom of the die hole 3, and the electric push rod extends upwards to eject a product. Of course, the ejection device may be a push rod driven by an air cylinder. However, because the ejection device is often subjected to great stress during the extrusion process of the extrusion device,

in order to ensure the stability and the service life of the ejection device. As shown in fig. 5, it is also better to practice the present invention that the ejector device includes an ejector rod 27 and an elevating mechanism for driving the ejector rod 27, where the ejector rod 27 is composed of a rod body and an end head arranged at the upper end of the rod body, and the size of the end head is larger than that of the rod body. The bottom of the die hole 3 is provided with a step-shaped rod hole vertically penetrating through the workbench 2 and the rack 1, the upper section of the rod hole is matched with the end of the ejector rod 27, the lower section of the rod hole is matched with the rod body of the ejector rod 27, and the ejector rod 27 penetrates through the rod hole. Therefore, when the extrusion device extrudes materials, the end head of the ejector rod 27 is actually supported in the stepped upper section of the rod hole, so that stable support is formed, the supporting force is ensured, and the condition that the downward pressure is directly transmitted to the jacking mechanism is avoided. The jacking mechanism comprises a top plate 28 and a rotating shaft 29, the top plate 28 is located below the ejector rod 27 and fixedly connected with the lower end of the ejector rod 27, and the top plate 28 rises to drive the ejector rod 27 to rise. The rotating shaft 29 is positioned below the top plate 28, and both ends of the rotating shaft 29 are mounted in bearing seats 32 through bearings, and the bearing seats 32 are fixed on the bottom surface of the frame 1. A plurality of cams 30 are uniformly provided on the circumferential surface of the rotating shaft 29 along the length direction of the rotating shaft 29, and as shown in fig. 5, three cams 30 are provided on the rotating shaft 29, and the cams 30 are in contact with the top plate 28. One end of the rotating shaft 29 is connected with the output end of a second stepping motor 31, and the second stepping motor 31 is fixedly arranged at the bottom of the frame 1.

In the use process of the ejection device, the second stepping motor 31 drives the rotating shaft 29 to rotate, the cam 30 on the rotating shaft 29 can drive the top plate 28 to move up and down in the rotating process, and the top plate 28 drives the ejector rod 27 to move up and down. When the extrusion is completed, the ejector rods 27 push up to eject the product. When the device is matched with a feeding device for use, a product is pushed out of the die hole 3 by the feeding device, and the material filling of the die hole 3 is completed again. Compared with the traditional press machine, the invention can greatly improve the production efficiency, does not need workers to stretch hands below the extruding device for operation, has excellent safety and avoids safety accidents. Meanwhile, the ejection mechanism has stable ejection capability and longer service life. Certainly, in order to further improve the stability, the number of the rotating shafts 29 may be two, the two rotating shafts 29 are symmetrically distributed below two sides of the top plate 28, and the two rotating shafts 29 are in transmission connection through a gear set to form opposite rotation, so that when the top plate 28 is jacked up by the cam 30, the stresses on two sides are more balanced, the structure of the gear set is simpler, and details are not described here. On this basis, the top plate 28 can also be set to be square, four corners of the top plate 28 are respectively provided with a positioning hole, a positioning rod 33 penetrates through each positioning hole, the positioning rods 33 are matched with the positioning holes to form sliding connection, the upper ends of the positioning rods 33 are fixedly connected with the rack 1, and the lower ends of the positioning rods 33 are provided with limiting heads, so that the movement stability of the top plate 28 is better.

In addition, the workbench 2 is also provided with a feeding device which can reciprocate along the length direction of the workbench 2 and is used for feeding powder materials into the die holes 3 and pushing the ejected products out of the die holes 3. In fact, that is to say the loading means has a mobile part able to move along the length of the table 2 from the extrusion zone to the loading zone and vice versa, the function of which mainly consists of two aspects, namely the pushing of the powder material along the length of the table 2 to the extrusion zone, and the filling of the die holes 3. And secondly, in the process of moving towards the extrusion area, pushing away the product which is extruded in the previous cycle and is ejected out, so as to realize unloading.

The feeding device has more specific structures, such as: the feeding device is a vertical square barrel driven by the air cylinder, a worker adds materials into the square barrel in a feeding area, and when the square barrel is driven by the air cylinder to move to an extrusion area, the materials can automatically fall into the die hole 3. Although the structure is simple, the square cylinder lacks sufficient scraping action on the material in the die hole 3, which often causes errors and unsaturations of the filling material. The feeding device can also be a moving trolley with a blanking port formed at the bottom, the moving trolley moves to the extrusion area, and the blanking port is opened to automatically drop the material into the die hole 3. However, this method also has the disadvantages of the aforementioned method, and the structure is complex, and an electromagnetic valve for controlling the discharging and a strickling assembly for strickling the material in the die hole 3 need to be arranged on the moving trolley in a matching manner.

For this purpose, the loading device according to the present invention is preferably implemented in the manner as shown in the figures, with reference to fig. 1 to 4, and comprises a loading frame 4 and a driving assembly, wherein the loading frame 4 is located on the working table 2, and the loading frame 4 comprises an inner frame 5 and an outer frame 6. As shown in fig. 3 and 4, the inner frame 5 and the outer frame 6 are both vertically cylindrical, a circle of annular mounting groove is formed on the circumferential surface of the middle part of the inner frame 5, the outer frame 6 is matched with the mounting groove and clamped in the mounting groove, the inner frame 5 and the outer frame 6 form a rotating fit, and a small clearance fit is formed between the bottom of the outer frame 6 and the workbench 2. In the material loading district, can add the material in material loading frame 4, along with the motion of material loading frame 4, material loading frame 4 can be with the material propelling movement to extrusion district in the nib 3. The outer frame 6 is connected with a driving assembly, and can reciprocate between the extrusion area and the feeding area under the driving of the driving assembly. Evenly be provided with many scrapers 7 along the radial extension of inside casing 5 on the inside wall of inside casing 5, the border of scraper 7 bottom contacts with the upper surface of workstation 2. The inner frame is characterized in that a circle of toothed ring 8 is further arranged on the circumferential surface of the top of the inner frame 5, a rack 9 is arranged on the workbench 2 along the length direction of the workbench 2, and the rack 9 is meshed with the toothed ring 8.

In the using process of the invention, the feeding frame 4 can reciprocate between the feeding area and the extrusion area under the driving of the driving component, and when the feeding frame 4 reaches the feeding area, powdery materials are introduced into the feeding frame 4. The in-process that material loading frame 4 removed along workstation 2, powder material is in material loading frame 4 inside and then is promoted, in order to prevent that the material from falling out workstation 2 from the side, workstation 2's both sides can also set up the side flange, and the side flange extends along 2 length direction of workstation. When the feeding frame 4 reaches the extrusion area, the die hole 3 is automatically filled with the materials, and filling is realized.

According to the invention, the feeding frame 4 is composed of the inner frame 5 and the outer frame 6, in the moving process of the feeding frame 4, the toothed ring 8 on the inner frame 5 is contacted with the rack 9, so that the inner frame 5 is driven to rotate in the outer frame 6 continuously, and as the scraper 7 is arranged in the inner frame 5, the scraper 7 can scrape materials repeatedly when the inner frame 5 rotates, so that the materials are filled in the die holes 3 more fully and stably. Usually, the number of the scrapers 7 is at least three, and when the scrapers 7 are thin because the inner ends are overhanging parts, slight shaking is easy to occur, and in order to further improve the stability of the scrapers 7 in scraping, the inner ends of the scrapers 7 are connected through a connecting ring 10, so that the scrapers 7 are connected into a whole, and the stability is better.

After filling, the loading frame 4 is driven by the drive assembly to return to the loading area for loading. And the extrusion device performs extrusion molding on the materials in the die hole, and after the molding is finished, the extrusion device returns and the ejection device ejects the finished product. The loading frame 4 enters the extrusion area again, on the one hand, the finished product is pushed out, and on the other hand, the die holes 3 are filled again. Compared with the existing press machine, the automatic press machine has higher automation degree, lays a solid foundation for batch production, and has better safety because the manual work does not need to be exposed below the extrusion device for operation. In addition, in order to further improve the safety, a steel wire mesh protective cover 26 is arranged outside the extrusion device.

In the process of pushing out a product by the feeding frame 4, when the feeding frame 4 is not large enough to completely eject the finished product, a discharging push plate 16 is further arranged on one side of the feeding frame 4, which is back to the feeding area, the discharging push plate 16 extends along the width direction of the workbench 2, and the discharging push plate 16 is connected with the outer frame 6 of the feeding frame 4 through a connecting rod 17. Furthermore, two ends of the discharging push plate 16 are bent towards one side back to the feeding frame 4 to form a U-shaped structure. In order to collect products conveniently, the end part of the rear section of the workbench 2 is further provided with a discharging assembly, the discharging assembly comprises a discharging channel 18 which extends obliquely downwards along the direction far away from the workbench 2 and is gradually reduced, a discharging hole is formed in the bottom of the lower end of the discharging channel 18 and is connected with one end of a cloth bag channel 19, and the other end of the cloth bag channel 19 extends into a collecting box 20.

One preferable driving assembly of the feeding device comprises a screw rod 11 and a guide rod 12 which are arranged at two sides of the feeding frame 4, the screw rod 11 and the guide rod 12 both extend along the length direction of the workbench 2, and one end of the screw rod 11 is connected with the output end of a first stepping motor 13. The guide rod 12 and the screw rod 11 are respectively sleeved with a sliding block 14, the sliding block 14 on the guide rod 12 and the guide rod 12 form sliding fit, and the sliding block 14 on the screw rod 11 and the screw rod 11 form threaded fit. The feeding frame 4 is positioned between the sliding blocks 14, and one surface of the sliding block 14 facing the feeding frame 4 is fixedly connected with the middle part of the outer frame 6 through a short rod 15. The working process is as follows, the first stepping motor 13 is started to drive the sliding block 14 to move along the screw rod 11 and the guide rod 12, and further drive the feeding frame 4 to move. The driving assembly has enough driving force, can ensure stable clearance fit between the feeding frame 4 and the workbench 2, and has good stability.

In the process of loading the loading device, in order to improve the automation level, a hopper 34 is also arranged above the workbench 2 in the loading area, and the hopper 34 is erected on the workbench 2 through a support rod. The bottom of hopper 34 sets up the drain hole, drain hole department is provided with blowing solenoid valve 35, and blowing solenoid valve 35 is the same with other electrical components, by the industrial computer control system electric connection of press. The workbench 2 at one end of the feeding area far away from the extrusion area is further provided with a proximity switch 36, the proximity switch 36 is adapted to the proximity body 37 and is triggered by the proximity body 37, the proximity body 37 is mounted on a moving part of the feeding device, and if the feeding device comprising the feeding frame 4 is adopted, the feeding frame 4 is substantially used as the moving part. When the proximity body 37 is attached to the loading frame 4, the proximity body 37 should be attached to the outer frame 6.

Specifically, when the moving part of the feeding device of the hopper 34 moves below the discharge port of the hopper 34 in the using process of the hopper 34, the approach body 37 triggers the approach switch 36, and the industrial personal computer for overall control of the press machine controls the discharge electromagnetic valve 35 at the discharge port to be opened for a certain time. The material in the hopper 34 automatically falls into the feeding device for replenishment. Finally, the material is moved to an extrusion area through a feeding device and is filled in the die hole 3. Compared with the mode of manually supplementing materials into the feeding device, the automatic feeding device has higher automation level, is convenient for stably controlling the amount of the materials filled in the feeding device, and lays a foundation for automatic production.

In order to reduce flying dust at the hopper 34 as much as possible, the top surface of the hopper 34 is closed, so that raw materials are conveniently supplemented into the hopper 34, a bucket elevator 38 is arranged on one side of the hopper 34, and the discharge end of the bucket elevator 38 is communicated with the interior of the hopper 34, so that the operation is more convenient, and the charging difficulty is lower. In addition, on the basis, a feeding motor 39 is further arranged at the top of the hopper 34, a vertical feeding rotating shaft 40 is arranged in the hopper 34, and the output end of the feeding motor 39 is connected with the feeding rotating shaft 40. A plurality of refining plates 41 extending along the radial direction of the feeding rotating shaft 40 are uniformly arranged on the circumferential surface of the upper section of the feeding rotating shaft 40. The feeding motor 39 drives the feeding rotating shaft 40 to rotate, the feeding rotating shaft 40 drives the material homogenizing plate 41 to rotate, and the material homogenizing plate 41 can uniformly distribute the materials stacked at the outlet end of the bucket elevator 38 into the whole hopper 34. The lower section of pay-off pivot 40 extends to the drain hole top, and is provided with on the global along the vertical helical tooth 42 that extends, and helical tooth 42 can produce a thrust down to the material along with pay-off pivot 40 pivoted in-process, and the better discharge from the drain hole of the material of being convenient for.

Claims

1. The utility model provides an automatic liftout press, includes frame (1), its characterized in that: a workbench (2) is arranged on the top surface of the rack (1) along the length direction of the rack (1), the top of the front section of the workbench (2) forms a feeding area, and the top of the rear section forms an extrusion area; a die hole (3) is formed in the top surface of the workbench (2) of the extrusion area, an extrusion device for extruding materials in the die hole (3) is arranged above the extrusion area, and an ejection device for ejecting a product extruded in the die hole (3) is arranged below the extrusion area; the workbench (2) is also provided with a feeding device which can reciprocate along the length direction of the workbench (2) and is used for feeding powder materials into the die hole (3) and pushing an ejected product out of the die hole (3);

the ejection device comprises an ejector rod (27) and a jacking mechanism for driving the ejector rod (27), wherein the ejector rod (27) consists of a rod body and an end head arranged at the upper end of the rod body; the bottom of the die hole (3) is provided with a step-shaped rod hole which vertically penetrates through the workbench (2) and the rack (1), the upper section of the rod hole is matched with the end of the ejector rod (27), the lower section of the rod hole is matched with the rod body of the ejector rod (27), and the ejector rod (27) penetrates through the rod hole; the jacking mechanism comprises a top plate (28) and a rotating shaft (29), wherein the top plate (28) is positioned below the ejector rod (27) and is fixedly connected with the lower end of the ejector rod (27); the rotating shaft (29) is positioned below the top plate (28), a plurality of cams (30) are uniformly arranged on the circumferential surface of the rotating shaft (29) along the length direction of the rotating shaft (29), and the cams (30) are in contact with the top plate (28); one end of the rotating shaft (29) is connected with the output end of a second stepping motor (31), and the second stepping motor (31) is fixedly arranged at the bottom of the rack (1);

the feeding device comprises a feeding frame (4) and a driving assembly, the feeding frame (4) is positioned on the workbench (2), the feeding frame (4) comprises an inner frame (5) and an outer frame (6), the inner frame (5) and the outer frame (6) are both in a vertical cylindrical shape, a circle of annular mounting groove is formed in the peripheral surface of the middle part of the inner frame (5), the outer frame (6) is matched with the mounting groove and clamped in the mounting groove, and the inner frame (5) and the outer frame (6) are in running fit; the outer frame (6) is connected with the driving assembly and can reciprocate between the extrusion area and the feeding area under the driving of the driving assembly; a plurality of scraping plates (7) extending along the radial direction of the inner frame (5) are uniformly arranged on the inner side wall of the inner frame (5), and the edge of the bottom of each scraping plate (7) is in contact with the upper surface of the workbench (2); the side periphery at the top of the inner frame (5) is also provided with a circle of toothed ring (8), the workbench (2) is provided with a rack (9) along the length direction of the workbench (2), and the rack (9) is meshed with the toothed ring (8).

2. The automatic topping press of claim 1 wherein: the number of the rotating shafts (29) is two, the two rotating shafts (29) are symmetrically distributed below two sides of the top plate (28), and the two rotating shafts (29) are in transmission connection through a gear set.

3. The automatic topping press of claim 2 wherein: two ends of the rotating shaft (29) are mounted in bearing seats (32) through bearings, and the bearing seats (32) are fixed on the bottom surface of the rack (1).

4. The automatic topping press of claim 3 wherein: the top plate (28) is square, four corners of the top plate (28) are respectively provided with a positioning hole, a positioning rod (33) penetrates through each positioning hole, the positioning rods (33) are matched with the positioning holes to form sliding connection, the upper ends of the positioning rods (33) are fixedly connected with the rack (1), and the lower ends of the positioning rods (33) are provided with limiting heads.

5. The automatic topping press of claim 4 wherein: the number of the scrapers (7) is at least three, and the inner ends of the scrapers (7) are connected through a connecting ring (10).

6. The automatic topping press of claim 5 wherein: the driving assembly comprises a screw rod (11) arranged on one side of the feeding frame (4) and a guide rod (12) positioned on the other side of the feeding frame (4), the screw rod (11) and the guide rod (12) both extend along the length direction of the workbench (2), and one end of the screw rod (11) is connected with the output end of a first stepping motor (13); the guide rod (12) and the screw rod (11) are respectively sleeved with a sliding block (14), the sliding block (14) positioned on the guide rod (12) is in sliding fit with the guide rod (12), and the sliding block (14) positioned on the screw rod (11) is in threaded fit with the screw rod (11); the feeding frame (4) is located between the 2 sliding blocks (14), and the sliding blocks (14) are fixedly connected with the middle of the outer frame (6) through the short rods (15) towards one surface of the feeding frame (4).

7. The automatic topping press of claim 6 wherein: one side of the feeding frame (4) back to the feeding area is also provided with a discharging push plate (16), the discharging push plate (16) extends along the width direction of the workbench (2), and the discharging push plate (16) is connected with the outer frame (6) of the feeding frame (4) through a connecting rod (17).

8. The automatic topping press of claim 7 wherein: the tip of workstation (2) rear section still is provided with the subassembly of unloading, the subassembly of unloading includes along the direction slant downwardly extending of keeping away from workstation (2) and the discharge passage (18) that diminishes gradually, the bottom of discharge passage (18) low side is provided with the discharge gate, the discharge gate is connected with the one end of sack passageway (19), the other end of sack passageway (19) stretches into in collecting box (20).

9. The automatic topping press of claim 8 wherein: the extrusion device comprises four guide upright posts (21) symmetrically arranged on the machine frame (1) at two sides of the extrusion area, and a top frame (22) is fixedly arranged at the top ends of the guide upright posts (21); a hydraulic cylinder (23) is arranged on the top frame (22); the extrusion device also comprises a square lifting platform (24), wherein four corner parts of the lifting platform (24) are sleeved on the guide upright post (21) and form sliding fit with the guide upright post (21); the top surface of the lifting platform (24) is connected with the output end of the hydraulic cylinder (23), the bottom of the lifting platform (24) is provided with an extrusion head (25), and the extrusion head (25) is provided with an extrusion bump matched with the die hole (3).