CN220299722U

CN220299722U - Automatic get blowing equipment

Info

Publication number: CN220299722U
Application number: CN202322004516.0U
Authority: CN
Inventors: 张志伟; 高益; 林康康; 耿凯霖; 皇甫青海; 唐远志
Original assignee: Shangqiu Jinzhenyuan Electronic Technology Co Ltd
Current assignee: Shangqiu Jinzhenyuan Electronic Technology Co Ltd
Priority date: 2023-07-28
Filing date: 2023-07-28
Publication date: 2024-01-05
Anticipated expiration: 2033-07-28

Abstract

The utility model belongs to the technical field of feeding and discharging in machining, and particularly relates to automatic material taking and discharging equipment. An automatic material taking and placing device comprises a workbench, a manipulator, a longitudinal adjusting mechanism and a bottom plate which are arranged on the workbench, a guide plate and a correlation photoelectric switch which are fixedly arranged on the workbench and are enclosed on the outer side of the bottom plate, a material tray provided with a plurality of positioning grooves, a material sucking component which is arranged on the manipulator and is used for sucking metal sheets, and a sucking disc component which is used for sucking the material tray; the material sucking assembly can sequentially transfer the metal sheets on the material tray in the material feeding assembly to the laser positioning platform and the material tray in the material receiving assembly; the sucking disc subassembly can be with the charging tray in the feed subassembly transport to receive in the material subassembly. The utility model can automatically take out, discharge after laser and automatically code the metal sheet.

Description

Automatic get blowing equipment

Technical Field

The utility model belongs to the technical field of feeding and discharging in machining, and particularly relates to automatic material taking and discharging equipment.

Background

As shown in fig. 1, a thin metal sheet 1 is provided with a hollow structure 11 and a mounting through hole 12, and after the metal sheet 1 is painted, the subsequent gold-plated part is required to be subjected to laser paint removal through laser equipment. In the existing laser paint removal process, the metal sheet 1 to be processed needs to be manually taken out from a material tray in sequence and placed on a laser positioning platform of laser equipment, a positioning clamp is arranged on the laser positioning platform to position and fix the metal sheet 1, and after paint removal is completed, a product is manually placed back into the material tray. In the process of taking and discharging, the fatigue degree of manual operation is high, and the metal sheet 1 is easy to be positioned poorly and is laser when being placed on a laser positioning platform, so that products are scrapped, and finally the manufacturing cost is increased.

Along with the development of robot technology, the application of feeding and discharging on the manipulator is more and more, for example, the Chinese patent application number 202020245502.1 discloses an automatic feeding and discharging device, which comprises a frame, a conveying manipulator and a plurality of feeding components, wherein the conveying manipulator comprises a movable arm and a clamping mechanism, the clamping mechanism comprises a clamping jaw body and two clamping jaws, the clamping jaws are integrally provided with clamping ends, limiting grooves are concavely formed in the inner side walls of the clamping ends, and the limiting grooves of the two clamping jaws are correspondingly arranged; the feeding assembly comprises an electric cylinder and a material tray support, a plurality of material placing holes are formed in the material tray support, and the material tray support is arranged on the electric cylinder in a sliding mode. The conveying manipulator is used for placing workpieces into the material placing holes of the material tray support or taking the workpieces out of the material placing holes of the material tray support, the electric cylinder is used for driving the material tray support to move along a preset route, a plurality of feeding components can convey different types of workpieces, the conveying manipulator and the feeding components are matched with each other to act, full-automatic feeding and discharging operation of the workpieces can be achieved, and the feeding and discharging working efficiency and feeding and discharging accuracy are improved.

Although the technical scheme of the patent realizes the automatic taking and discharging functions of the products to a certain extent, the technical scheme has the problems of low automation degree and low working efficiency of the taking and discharging operation of the workpieces, and can not realize the functions of automatic code wheel and the like after discharging; in addition, since the metal sheet 1 has a thin structure, the above technical solution cannot realize the processes of automatic material taking, laser post-material discharging, automatic code disc and the like of the metal sheet 1.

Disclosure of Invention

For solving the technical problem that exists among the prior art, this application provides one kind and can carry out automatic getting the blowing equipment of blowing, automatic code wheel after automatic getting, radium-shine to the sheet metal.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

an automatic get blowing equipment, includes workstation and manipulator, still includes:

the material tray adjusting assembly comprises a longitudinal adjusting mechanism arranged on the workbench and a bottom plate arranged on the longitudinal adjusting mechanism;

the feeding and receiving assembly comprises a feeding assembly and a receiving assembly, wherein the feeding assembly and the receiving assembly both comprise guide plates fixedly arranged on a workbench and enclosed on the outer side of a bottom plate and opposite photoelectric switches oppositely arranged on the guide plates;

the material trays are provided with a plurality of positioning grooves for placing metal sheets, and the material trays can be sequentially stacked on the bottom plate at the inner side of the guide plate;

the picking and placing assembly is arranged on the manipulator and comprises a sucking assembly for sucking metal sheets and a sucking disc assembly for sucking a material disc;

the material sucking assembly can sequentially transfer the metal sheets on the material tray in the material feeding assembly to the laser positioning platform and the material tray in the material receiving assembly; the sucking disc component can transfer the material disc in the material supply component into the material receiving component;

the controller is respectively connected with and controls the longitudinal adjusting mechanism, the correlation photoelectric switch, the manipulator and the picking and placing assembly.

Preferably, the longitudinal adjusting mechanism comprises a bushing vertically embedded on the workbench, a circular rack sliding in the bushing, an adjusting motor horizontally arranged on the lower end face of the workbench, and a gear fixedly connected to an output shaft of the adjusting motor, wherein the gear is meshed with the circular rack, and the upper end of the circular rack is fixedly connected to the lower end face of the bottom plate.

Preferably, the longitudinal adjusting mechanism further comprises a guide assembly, wherein the guide assembly comprises a linear bearing vertically and fixedly embedded in the workbench and a guide shaft which is internally sleeved in the linear bearing, and the upper end of the guide shaft is fixedly connected to the lower end face of the bottom plate.

Preferably, the guide plates comprise two L-shaped first guide plates which are vertically and oppositely arranged on the workbench in the direction close to the manipulator, two U-shaped second guide plates which are vertically and oppositely arranged on the workbench in the direction far away from the manipulator, and a third guide plate which is rotationally connected to the second guide plates; the first guide plate, the second guide plate and the third guide plate enclose to form a tray cavity for placing the tray, and the third guide plate can be turned over to open the tray cavity.

Preferably, a positioning column matched with the mounting through hole of the metal sheet is vertically arranged in the positioning groove of the charging tray, and the positioning column can be arranged in the mounting through hole in a penetrating way; and a material taking notch communicated with the positioning groove is formed in the groove wall of the adjacent positioning groove.

Preferably, a positioning notch is formed in the outer end face of the material tray, a limiting groove is formed in the lower end face of the material tray, and when the material trays are stacked, the upper end face of the material tray can be embedded in the positioning groove.

Preferably, the material sucking component comprises a mounting plate horizontally and fixedly connected to the manipulator, a material sucking nozzle vertically and fixedly embedded on the mounting plate, and a vacuum adsorption component connected with the material sucking nozzle.

Preferably, the sucking disc assembly comprises a blank taking disc cylinder vertically and fixedly connected to the mounting plate, a suction nozzle support fixedly connected to a guide rod on the blank taking disc cylinder, and a blank sucking disc suction nozzle vertically and fixedly embedded on the suction nozzle support, and the sucking disc assembly is provided with two groups.

Preferably, a protective fence is arranged on the workbench at the outer side of the feeding and receiving assembly, and a safety grating is arranged on the protective fence.

Compared with the prior art, the utility model has the beneficial effects that:

according to the utility model, the height of the material tray in the material supply and receiving assembly can be adjusted by arranging the material tray adjusting assembly and the opposite-irradiation photoelectric switch, so that the uppermost material tray in the material supply and receiving assembly is always positioned at the same height, and the manipulator can conveniently drive the material taking and placing assembly to take and place materials on the material tray; by arranging the taking and placing assembly comprising the material sucking assembly and the sucking disc assembly, not only can the taking and placing of the metal sheets be realized, but also the empty material tray can be transported into the material receiving assembly from the material supplying assembly; the utility model realizes a whole set of automatic operations of automatic material taking, material receiving after laser, automatic code disc and the like of thin metal sheets through the cooperative operation of the components. Compared with manual operation, the automatic taking and placing equipment has the advantages that manual clamping, positioning and taking operations are omitted, and remarkable effects are improved in the aspects of productivity, yield, personnel operation environment and the like.

Drawings

Fig. 1 is a schematic view of a thin metal sheet according to the present utility model.

FIG. 2 is a schematic diagram of the structure of the laser positioning platform and the laser equipment of the utility model when the metal sheet is taken and discharged.

Fig. 3 is a schematic structural diagram of the utility model in taking and discharging materials.

Fig. 4 is a schematic view of a first view structure of a tray according to the present utility model.

Fig. 5 is a schematic view of a second view structure of the tray of the present utility model.

Fig. 6 is a schematic view of the overall structure of the utility model without the tray.

Fig. 7 is a schematic diagram of a connection structure of a tray adjustment assembly, a feeding assembly and a receiving assembly according to the present utility model.

Fig. 8 is a left-hand structural schematic diagram of fig. 7.

Fig. 9 is a schematic rear view of the structure of fig. 7.

Fig. 10 is a schematic view of a first view structure of the pick-and-place assembly according to the present utility model.

Fig. 11 is a schematic view of a second view structure of the pick-and-place assembly according to the present utility model.

Fig. 12 is a right-side view of the structure of fig. 10.

In the figure: 1. metal sheet, 11, hollow structure, 12, mounting through hole,

2. a tray 21, a positioning groove 22, a positioning column 23, a material taking notch 24, a positioning notch 25 and a limiting groove,

3. laser equipment 31, a laser positioning platform 32 and a positioning fixture,

4. a workbench 41, a supporting frame 42 and a rotating wheel,

5. a manipulator, 51, a rotating mechanism,

6. the tray adjusting assembly 61, the longitudinal adjusting mechanism 611, the bushing, 612, the circular rack 613, the adjusting motor 614, the gear 615, the linear bearing 616, the guide shaft 62, the bottom plate,

7. a feeding and receiving assembly 71, a feeding assembly 711, a first guide plate 712, a second guide plate 713, a third guide plate 72, a receiving assembly 73, an opposite-emitting photoelectric switch 74, a protective fence 75, a control panel 76, a safety grating,

8. the suction nozzle comprises a picking and placing component 81, a suction component 811, a mounting plate 812, a suction nozzle 82, a suction disc component 821, a suction disc cylinder 822, a suction nozzle bracket 823 and a suction disc suction nozzle.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments, and that all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the embodiments in the present utility model are within the protection scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Examples:

referring to fig. 3 and 6, an automatic material taking and placing device comprises a workbench 4, a manipulator 5, a material tray adjusting assembly 6, a material feeding and receiving assembly 7, a material tray 2 and a material taking and placing assembly 8.

The table 4 has a planar structure, a support frame 41 is bolted to the lower end surface of the table 4, and a rotating wheel 42 is provided on the lower end surface of the support frame 41 in order to facilitate the support and movement of the table 4.

The manipulator 5 is in the prior art, and the bolt is fixedly installed at the material taking and placing position on the workbench 4, and the specific structure and model of the manipulator 5 can be specifically selected according to the actual working scene, so long as the working process in the embodiment can be satisfied, and no description is repeated here.

Referring to fig. 7, 8 and 9, the tray adjusting assembly 6 includes a longitudinal adjusting mechanism 61 disposed on the workbench 4 and a bottom plate 62 disposed on the longitudinal adjusting mechanism, and the tray adjusting assembly 6 is used for keeping the uppermost tray 2 stacked on the bottom plate 62 at the same height all the time, so that the manipulator 5 drives the picking and placing assembly 8 to pick and place the metal sheets 1 and the tray 2.

The longitudinal adjustment mechanism 61 comprises a bushing 611 vertically and fixedly embedded on the workbench 4, a circular rack 612 sliding in the bushing 611, an adjustment motor 613 horizontally and fixedly connected with the lower end surface of the workbench 4 through bolts, and a gear 614 keyed with the output shaft of the adjustment motor 613, wherein the gear 614 is meshed with the circular rack 612, and the upper end of the circular rack 612 is fixedly connected with the lower end surface of the bottom plate 62 through bolts. Thus, by the vertical adjustment mechanism 61, the bottom plate 62 is driven to move up and down when the adjustment motor 613 rotates in the forward and reverse directions, and the height of the trays 2 stacked on the bottom plate 62 is adjusted.

In order to improve the connection strength between the longitudinal adjustment mechanism 61 and the workbench 4 and to improve the smoothness and accuracy of the vertical adjustment of the bottom plate 62, the longitudinal adjustment mechanism 6 further comprises a guide assembly, the guide assembly comprises a linear bearing 615 vertically and fixedly embedded in the workbench 4 through bolts and a guide shaft 616 sliding in the linear bearing 615, and the upper end of the guide shaft 616 is fixedly connected to the lower end face of the bottom plate 62 through bolts.

Referring to fig. 3 and 7, the feeding and receiving assembly 7 is disposed on the upper end surface of the workbench 4, and is provided with two groups, namely a feeding assembly 71 at a feeding station and a receiving assembly 72 at a receiving station, wherein the feeding assembly 71 and the receiving assembly 72 have the same structure and are respectively provided with a longitudinal adjusting mechanism 6 correspondingly. The feeding assembly 71 and the receiving assembly 72 each include a guide plate fixedly disposed on the table 4 and surrounding the outer side of the bottom plate 62, and a correlation photoelectric switch 73 oppositely disposed on the guide plate. In the present embodiment, only the feed block 71 will be described.

Specifically, the guide plates include a first guide plate 711, a second guide plate 712, and a third guide plate 713. The first guide plate 711 is fixedly arranged on the upper end surface of the workbench 4 in a direction close to the manipulator 4 vertically opposite to the bolt, the first guide plate 711 is of an L-shaped structure, and the inner end surface of the L-shaped structure is oppositely arranged; the second guide plate 712 is vertically opposite to the direction away from the manipulator 4 and is fixedly arranged on the upper end surface of the workbench 4 by bolts, the second guide plate 712 is of a U-shaped structure, and the inner end surfaces of the U-shaped structure are arranged in a deviating way; the third guide plate 713 is rotatably coupled to the second guide plate 712 by a hinge pin and the third guide plate 713 is disposed opposite to the first guide plate 711. The first guide plate 711, the second guide plate 712, and the third guide plate 713 enclose a tray cavity in which the tray 2 is placed and guided, and the tray 2 is stackable in the tray cavity and is longitudinally movable by the longitudinal adjustment mechanism 61 and the bottom plate 62. The third guide plate 713 may be turned over to open the tray cavity for taking and placing the stacked trays 2 in the tray cavity.

The opposite-shooting photoelectric switch 73 is fixedly arranged on the second guide plate 712, and the opposite-shooting photoelectric switch 73 is electrically connected with the controller and controls the longitudinal adjustment mechanism 61. The opposite-shooting photoelectric switch 73 is used for always keeping the uppermost tray 2 in the feeding assembly 71 and the receiving assembly 72 at a fixed position, so that the manipulator 4 drives the picking and placing assembly 8 to adsorb the metal sheets 1 and the tray 2, and the height of the manipulator 4 in the longitudinal direction is prevented from being frequently adjusted.

Referring to fig. 4 and 5, a plurality of positioning grooves 21 for placing the metal sheets 1 are formed in the tray 2, the size of the tray 2 is matched with the space of the tray cavity, and a plurality of trays 2 can be stacked on the bottom plate 62 inside the guide plate in sequence.

Specifically, a positioning column 22 matching with the mounting through hole 12 of the metal sheet 1 is vertically provided in the positioning groove 21 of the tray 2. When the metal sheet 1 is placed in the positioning groove 21, the positioning column 22 can be penetrated in the mounting through hole 12, thereby realizing accurate positioning of the metal sheet 1.

A material taking notch 23 communicated with the positioning grooves 21 is formed in the groove walls of the two adjacent positioning grooves 21, and the metal sheet 1 is conveniently taken and placed manually by arranging the material taking notch 23.

A positioning notch 24 is formed on the outer end surface of the material tray 2, namely, a boss structure is formed on the upper part of the material tray 2, and a limit groove 25 is formed on the lower end surface of the material tray 2. When the material trays 2 are longitudinally stacked, the boss structure of the upper end face of the material trays 2 can be embedded in the limit groove 25, and the outer end face of the boss structure can be abutted against the groove wall of the limit groove 25, so that the accurate positioning of the material trays 2 during stacking is realized.

Referring to fig. 10, 11, 12, the pick-and-place assembly 8 is provided on the rotating mechanism 51 of the robot 5 and includes a suction assembly 81 for sucking the metal sheet 1 and a suction cup assembly 82 for sucking the tray 2.

Specifically, the suction assembly 81 includes a mounting plate 811 horizontally and fixedly connected to the rotating mechanism 51 of the manipulator 5 by bolts, a suction nozzle 812 vertically and fixedly embedded in the mounting plate 811, and a vacuum suction assembly (not shown in the drawings) connected to the suction nozzle 812. When the metal sheet 1 is adsorbed, the vacuum adsorption assembly enables the material sucking nozzle 812 to adsorb the metal sheet 1, so that the operation of taking and placing the metal sheet 1 by the material sucking assembly 81 is realized. The structure and operation of the vacuum suction assembly and the suction nozzle 812 are conventional, and will not be described in detail herein. In order to improve stability when adsorbing the metal sheet 1, the suction assembly 81 is provided with two groups.

The suction cup assembly 82 includes a suction cup cylinder 821 fixedly embedded vertically upward on a mounting plate 811, a suction nozzle bracket 822 fixedly connected to a guide rod on the suction cup cylinder 821, and a suction cup suction nozzle 823 fixedly embedded vertically downward on the suction nozzle bracket 822. When the suction nozzle 812 adsorbs the metal sheet 1, the guide rod of the empty disc taking cylinder 821 protrudes to make the lower end face of the empty disc suction nozzle 823 higher than the lower end face of the suction nozzle 812, and when the empty disc suction nozzle 823 adsorbs the material disc 2, the guide rod of the empty disc taking cylinder 821 retracts to make the lower end face of the empty disc suction nozzle 823 lower than the lower end face of the suction nozzle 812. To improve stability when adsorbing the tray 2, the suction cup assembly 82 is provided with two sets.

Referring to fig. 2, guard rails 74 are vertically disposed on the work tables at both outer sides of the feeding and receiving assembly 7, and a control panel 75 and a safety grating 76 are disposed on the guard rails 74 near one side of the third guide plate 713, and the control panel 75 is electrically connected to the controller. By providing the safety grating 76, the safety of workers in handling the material is further improved.

The controller may be a PLC controller, which is respectively connected to and controls the longitudinal adjustment mechanism 61, the correlation photoelectric switch 73, the manipulator 5 and the pick-and-place assembly 8, and the above control principle is the prior art, and the specific connection mode and the control logic only need to satisfy the following working procedures.

The working process of the embodiment of the utility model is as follows:

1. the components are installed according to the structural description of the present embodiment, as shown in fig. 2;

2. automatic feeding: the third guide plate 713 of the feeding station, namely the feeding assembly 71, is opened, the stacked trays with the metal sheets 1 placed thereon are manually placed on the bottom plate 62 in the tray cavity, a start button on the control panel 75 is pressed, and the adjusting motor 613 drives the gear 614 to rotate, so that the circular rack 612 is driven to move up and down, and the automatic feeding position is reached when the uppermost tray 2 on the bottom plate 2 passes through the opposite-shooting photoelectric switch 73;

3. automatic picking and placing: when the stacked material trays 2 reach an automatic feeding position, the mechanical arm 5 drives the material sucking nozzles 812 on the mounting plate 811 arranged at the tail end of the material trays to suck the metal sheets 1 in the material trays 2 by vacuum, and sequentially transfer the metal sheets to the positioning clamp 32 on the laser positioning platform 31, and the laser equipment 3 performs laser operation on the metal sheets 1; after the laser is finished, the material absorbing nozzle 812 absorbs the metal sheet 1 in the positioning clamp 32 and transfers the metal sheet 1 into the material receiving station and the material tray 2 in the material receiving assembly 72;

4. automatic material collection: when the metal sheet 1 is fully filled in the material receiving station, namely the uppermost layer material tray 2 in the material receiving assembly 72, the adjusting motor 613 drives the gear 614 to rotate, so as to drive the circular rack 612 to move downwards, and when the uppermost layer material tray 2 on the bottom plate 2 passes through the opposite-irradiation photoelectric switch 73, the automatic material receiving position is reached;

5. and (3) circularly operating: after the laser operation is finished on the metal sheet 1 in the feeding station and the tray 2 in the feeding assembly 71, the guide rod of the empty tray taking cylinder 821 is retracted and drives the empty tray suction nozzle 823 installed on the suction nozzle bracket 822 to push down, so that the lower end surface of the empty tray suction nozzle 823 is lower than the lower end surface of the suction nozzle 812, and then the empty tray 2 is transferred from the feeding assembly 71 to the tray 2 in the receiving assembly 72 by the empty tray suction nozzle 823.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Automatic get blowing equipment, including workstation and manipulator, its characterized in that: further comprises:

2. An automatic pick-and-place apparatus as claimed in claim 1, wherein: the vertical adjustment mechanism comprises a bushing vertically embedded on the workbench, a circular rack sliding in the bushing, an adjustment motor horizontally arranged on the lower end face of the workbench, and a gear fixedly connected to an output shaft of the adjustment motor, wherein the gear is meshed with the circular rack, and the upper end of the circular rack is fixedly connected to the lower end face of the bottom plate.

3. An automatic pick-and-place apparatus as claimed in claim 2, wherein: the longitudinal adjusting mechanism further comprises a guide assembly, the guide assembly comprises a linear bearing vertically and fixedly embedded in the workbench and a guide shaft which is internally sleeved in the linear bearing, and the upper end of the guide shaft is fixedly connected to the lower end face of the bottom plate.

4. An automatic pick-and-place apparatus as claimed in claim 1, wherein: the guide plates comprise two L-shaped first guide plates which are vertically and oppositely arranged on the workbench in the direction close to the manipulator, two U-shaped second guide plates which are vertically and oppositely arranged on the workbench in the direction far away from the manipulator, and a third guide plate which is rotationally connected to the second guide plates; the first guide plate, the second guide plate and the third guide plate enclose to form a tray cavity for placing the tray, and the third guide plate can be turned over to open the tray cavity.

5. An automatic pick-and-place apparatus as claimed in claim 1, wherein: a positioning column matched with the mounting through hole of the metal sheet is vertically arranged in the positioning groove of the charging tray, and the positioning column can be arranged in the mounting through hole in a penetrating manner; and a material taking notch communicated with the positioning groove is formed in the groove wall of the adjacent positioning groove.

6. An automatic pick-and-place apparatus as claimed in claim 5 wherein: the positioning notch is formed in the outer side end face of the material tray, the limiting groove is formed in the lower end face of the material tray, and the upper end face of the material tray can be embedded in the positioning groove when the material trays are stacked.

7. An automatic pick-and-place apparatus as claimed in claim 1, wherein: the material sucking assembly comprises a mounting plate horizontally and fixedly connected to the manipulator, a material sucking nozzle vertically and fixedly embedded on the mounting plate, and a vacuum adsorption assembly connected with the material sucking nozzle.

8. An automated pick-and-place apparatus as claimed in claim 7 wherein: the sucking disc subassembly includes vertical fixed connection get empty disc cylinder on the mounting panel, get on the guide arm on the empty disc cylinder fixed connection's suction nozzle support and be in vertical fixed suction disc suction nozzle who inlays on the suction nozzle support, the sucking disc subassembly is provided with two sets of.

9. An automatic pick-and-place apparatus as claimed in claim 1, wherein: the workbench outside the feeding and receiving assembly is provided with a protective fence, and the protective fence is provided with a safety grating.