CN210234324U

CN210234324U - Automatic go up unloading sheet silk screen printing machine

Info

Publication number: CN210234324U
Application number: CN201920695516.0U
Authority: CN
Inventors: Dexue Zhou; 周德学
Original assignee: Zhengzhou Si Ke Rui Technology Co ltd
Current assignee: Zhengzhou Si Ke Rui Technology Co ltd
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2020-04-03
Anticipated expiration: 2029-05-15

Abstract

The utility model relates to an automatic feeding and discharging sheet silk screen printing machine, which comprises a feeding device, wherein the feeding device comprises a lifting seat for placing sheets to be printed, and also comprises a material grabbing and feeding device, a printing platform and a discharging device, and the material grabbing and feeding device comprises a sucker mechanism, a lifting device and a linear driving device; the lifting device comprises a base body, a screw lifting mechanism is arranged on the base body, the screw lifting mechanism and the support arm transmission base body are assembled on the linear slide rail in a sliding manner along the direction of the linear slide rail, and the base body is driven by a linear driving mechanism; the printing platform comprises a printing frame and an object carrying platform arranged on the printing frame, and a first positioning assembly and a second positioning assembly are respectively arranged on two adjacent sides of the object carrying platform. The utility model discloses automatic go up unloading sheet silk screen printing machine when improving degree of automation, can also improve the printing precision.

Description

Automatic go up unloading sheet silk screen printing machine

Technical Field

The utility model relates to a silk screen printing machine technical field, concretely relates to automatic go up unloading sheet silk screen printing machine.

Background

The traditional screen printer has low automation degree, carries out feeding and discharging manually, and is suitable for small-scale production. The utility model discloses a full-automatic sheet silk screen printing machine as utility model patent of grant publication No. CN206968171U, this silk screen printing machine include lift seat, manipulator, automatic feeding device, girder, straight guide rail and locating plate. The automatic feeding device comprises a lifting seat and is used for stacking products and pushing the products upwards. The mechanical arm is provided with a sucker for grabbing the product.

The general working principle of the screen printer in the above patent is as follows: the products are stacked on the lifting seat and controlled to lift through the motor. The sucking disc of manipulator takes up the product and sends to dust collector department, then carries to the conveyer belt, carries the product to table surface through the conveyer belt. The crossbeam is driven to move to a working position through the lifting motor, and finally the ink scraping knife and the ink returning knife are controlled to move through the lifting cylinder on the printing head to print. And (5) after printing is finished, outputting the product through a conveying belt.

The automation degree of the screen printing machine is improved to a certain extent compared with that of the traditional screen printing machine, but the position of the product on the screen printing plate cannot be ensured to be accurate by conveying the product to the working table surface through the conveying belt.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an automatic go up unloading sheet silk screen printing machine utilizes new conveying mechanism to solve among the prior art and use the conveyer belt to convey the problem that can not guarantee the position accuracy that the product exists between workstation and loading attachment.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the automatic feeding and discharging sheet silk screen printing machine comprises a feeding device, a grabbing and feeding device, a printing platform and a discharging device, wherein the feeding device comprises a lifting seat for placing a sheet to be printed, and the grabbing and feeding device comprises a sucker mechanism, a lifting device and a linear driving device;

the sucking disc mechanism comprises a sucking disc for grabbing the uppermost layer of sheet on the lifting seat and a sucking disc supporting arm for supporting the sucking disc;

the lifting device comprises a base body, a lead screw lifting mechanism is arranged on the base body, and the lead screw lifting mechanism is in transmission connection with the supporting arm;

the linear driving device comprises a linear slide rail and a linear driving mechanism, the seat body is assembled on the linear slide rail in a sliding manner along the direction of the linear slide rail, and the seat body is driven by the linear driving mechanism;

the printing platform comprises a printing frame and an object carrying platform arranged on the printing frame, and a first positioning assembly and a second positioning assembly are respectively arranged on two adjacent sides of the object carrying platform;

the first positioning assembly comprises a first positioning cylinder and a first positioning thimble driven by the first positioning cylinder, the second positioning assembly comprises a second positioning cylinder and a second positioning thimble driven by the second positioning cylinder, a perforation for the first positioning thimble and the second positioning thimble to pass through is arranged on the object carrying platform, and the first positioning cylinder and the second positioning cylinder are positioned below the object carrying platform;

the first positioning thimble and the second positioning thimble are both provided with an initial position and an ejection position and are positioned at the ejection position, and the first positioning thimble and the second positioning thimble are positioned aiming at two adjacent side edges of the placed sheet; at the initial position, the upper ends of the first positioning thimble and the second positioning thimble return to the through hole;

the through hole corresponding to the first positioning thimble is marked as a first through hole, and the first through hole is a chute which is communicated up and down;

the first positioning cylinder is arranged on an inclined push plate, the inclined push plate is connected with an inclined push plate driving mechanism, and the movement direction of the inclined push plate is consistent with the inclination direction of the inclined groove;

the blanking device comprises a blanking rack and a conveying belt arranged on the blanking rack and used for conveying printed sheets, wherein a material taking manipulator is arranged on the blanking rack and used for grabbing the printed sheets onto the conveying belt.

Furthermore, the sucker comprises a supporting plate body and a plurality of suction nozzle mounting arms which are distributed on the supporting plate body and used for mounting suction nozzles, and the supporting plate body is connected with the sucker supporting arms; a plurality of long holes are formed in the supporting plate body, and one end of the suction nozzle mounting arm is fixed to the position, corresponding to the long holes, of the supporting plate body.

Further, the long hole comprises a transverse long hole, a longitudinal long hole and an inclined long hole according to the extending direction.

Furthermore, the feeding device also comprises a feeding rack, the lifting seat is arranged on the feeding rack, an elastic shifting sheet is also arranged on the feeding rack, one end of the elastic shifting sheet is fixed with the feeding rack, and the other end of the elastic shifting sheet is suspended and is an elastic end; the elastic end of the elastic shifting piece is formed with a shifting piece part which is used for shifting the side edge of the sheet when the sucking disc upwards grabs the sheet.

Further, the second through hole is formed in one side, close to the blanking device, of the loading platform, and the inclined direction of the first through hole faces the direction of the second through hole.

Furthermore, one side of the carrying platform, which is close to the discharging device, is provided with a discharging thimble hole, a discharging thimble is arranged below the carrying platform, the discharging thimble is driven by a discharging cylinder, the discharging thimble moves up and down along the discharging thimble hole, and the discharging thimble has an initial position and a discharging position when being ejected upwards; the discharging thimble hole and the second through hole are arranged side by side, and the distance between the discharging thimble hole and the discharging device is larger than the distance between the second through hole and the discharging device.

Further, be equipped with a pair of half tone mounting bracket in the printing frame, half tone mounting bracket includes fine setting structure around L type support arm, half tone clamp and the half tone, and fine setting structure around the half tone includes first guide rail, the second guide rail that the fore-and-aft direction extends, and first guide rail passes through dovetail sliding fit with the second guide rail, first guide rail and L type support arm fixed connection, the one side-mounting of the first guide rail of second guide rail dorsad half tone clamp, half tone clamp front portion are equipped with the fine setting installation piece, are equipped with accommodate the lead screw on the fine setting installation piece, accommodate the lead screw one end spiral assembly on first guide rail.

The utility model has the advantages that:

the utility model discloses automatic go up unloading sheet silk screen printing machine adopts the linear driving mechanism of slide rail formula, and cooperation sucking disc mechanism is carried the sheet of loading attachment department to printing platform department intermittently one by one. Furthermore, two groups of positioning assemblies which are matched with each other are arranged on the carrying platform on the printing platform, so that the adjacent two side edges of the sheet can be positioned, the sheet placed on the carrying platform at each time is ensured to be identical in position, and the printing precision of the sheet can be improved.

Drawings

FIG. 1 is a schematic structural view of an automatic feeding and discharging sheet screen printing machine of the present invention;

fig. 2 is another angle structure diagram of the automatic feeding and discharging sheet screen printing machine of the present invention;

fig. 3 is a schematic structural view of the elevating plate body in fig. 1;

FIG. 4 is a schematic view of a part of the structure of the feeding device;

FIG. 5 is a partial schematic view of the suction cup mechanism;

fig. 6 is a schematic perspective view of the carrier platform;

fig. 7 is a schematic perspective view (from bottom to top) of the carrier platform;

FIG. 8 is a schematic diagram of a fine adjustment structure of the screen;

FIG. 9 is a partial structural view of the loading frame (a view of the installation position of the elastic poking sheet);

FIG. 10 is a schematic view of the printing deck of FIG. 1;

FIG. 11 is a schematic view showing a process of positioning a sheet by the positioning unit on the loading platform in example 1;

FIG. 12 is a schematic view showing the process of positioning the sheet by the positioning unit on the loading platform in example 2.

The corresponding names in the figure are marked as follows:

1. a feeding device, 11, a feeding frame, 12, a lifting plate body, 121, a horizontal plate body, 122, a vertical plate body, 123, a longitudinal open slot, 124, a transverse open slot, 13, a vertical slide rail, 14, an elastic shifting sheet, 2, a linear driving device, 21, a cover body, 3, a lifting device, 31, a base body, 32, a lead screw, 33, a servo motor mounting seat, 4, a suction disc mechanism, 41, a supporting plate body, 411, a transverse long hole, 412, a longitudinal long hole, 413, an inclined long hole, 42, a suction disc supporting arm, 43, a suction nozzle mounting arm, 431, a suction nozzle mounting hole, 5, a printing platform, 6, a printing host, 61, a cross beam, 62, a printing head, 63, an L-shaped supporting arm, 7, a loading platform, 70, an inclined pushing plate, 71, a second through hole, 710, a second positioning thimble, 72, a discharging thimble hole, 73, a sensor mounting hole, 74, a first through hole, 740 and a first positioning thimble, 75. the device comprises a first positioning cylinder 76, a second positioning cylinder 77, a stepping motor 78, a lead screw 79, a nut seat 8, a screen plate front and back fine adjustment structure 81, a first guide rail 82, a second guide rail 83, a screen plate clamp 84, an adjusting lead screw 85, a fine adjustment mounting block 86, a scale handle 9, a blanking device 91, a conveying belt 92, a material taking manipulator 100 and a sheet.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Example 1:

as shown in fig. 1-11, the automatic feeding and discharging screen printing machine for sheet materials comprises a feeding device 1, a printing platform 5 and a discharging device 9 which are arranged from left to right.

The feeding device 1 comprises a feeding rack 11 and a lifting seat for placing sheets to be printed, and the lifting seat is arranged on the feeding rack 11. The lifting seat comprises a lifting plate body 12, the lifting plate body 12 comprises a horizontal plate body 121 and a vertical plate body 122, and the horizontal plate body 121 is used for placing a stack of sheets. Vertical plate 122 is assembled on material loading frame 11 along upper and lower direction slip, is equipped with the vertical slide rail 13 of adaptation on the material loading frame 11, and vertical plate 122 is through the drive of material loading lead screw, and the material loading lead screw is driven by servo motor. The servo motor controls the intermittent fixed-height movement of the lifting seat, namely after the uppermost sheet is grabbed away, the lifting seat can be lifted to a set height, so that the uppermost sheet moves upwards in the height direction. The lifting seat belongs to a mature technology in the field of automatic feeding in the prior art.

As shown in fig. 3, two adjacent sides of the horizontal plate 121 are provided with a transverse opening groove 124 and a longitudinal opening groove 123, respectively for installing a positioning plate (not shown). The locating plate passes through the bolt fastening and is in corresponding opening trench position, and the vertical face of locating plate can be fixed a pile of sheet of placing originally for each layer sheet aligns. The long-groove transverse open slot and the long-groove longitudinal open slot are arranged instead of common bolt holes, so that the positioning plate can be adjusted to adapt to sheets of different sizes.

The automatic feeding and discharging sheet silk screen printing machine comprises a grabbing and feeding device, wherein the grabbing and feeding device comprises a sucker mechanism 4, a lifting device 3 and a linear driving device 2.

As shown in fig. 4 and 5, the suction cup mechanism 4 includes a suction cup for gripping the uppermost sheet on the lifter base and a suction cup support arm 42 supporting the suction cup. The suction cup comprises a supporting plate body 41 and a plurality of suction nozzle mounting arms 43 which are distributed on the supporting plate body 41 and are used for mounting suction nozzles. The suction nozzle is a vacuum suction nozzle with mature technology, and the principle of the suction nozzle belongs to the prior art, and the vacuum suction nozzle and a corresponding control air circuit are not shown in the figure, and only a suction nozzle mounting hole 431 of the vacuum suction nozzle is shown.

The supporting plate body 41 is connected with the sucker supporting arm 42; a plurality of long holes are arranged on the supporting plate body 41, and one end of the suction nozzle mounting arm 43 is fixed at the corresponding long hole position of the supporting plate body 41. The suction nozzle mounting arms 43 are arranged at the center of the suction nozzle mounting arms symmetrically and are distributed on the periphery of the supporting plate body 41. The long hole includes a horizontal long hole 411, a vertical long hole 412, and an inclined long hole 413 in the extending direction. Through setting up these a plurality of slot hole for the installation of suction nozzle installation arm is adjustable, is suitable for the snatching of the sheet of different sizes.

As shown in fig. 4, the lifting device 3 includes a base 31, and a screw lifting mechanism is disposed on the base 31 and is in transmission connection with the support arm. The screw rod lifting mechanism comprises a screw rod and a servo motor for driving the screw rod, the servo motor is arranged on the upper portion of the base body 31, and only the servo motor mounting base 33 is shown in the figure. The screw 32 is located in the seat body 31, and the output end of the screw 32 is in transmission connection with the support arm through a transmission block (screw nut).

The feeding rack 11 is also provided with an elastic shifting sheet 14, one end of the elastic shifting sheet 14 is fixed with the feeding rack 11, and the other end of the elastic shifting sheet is suspended and is an elastic end; the elastic end of the elastic pick 14 forms a pick part for picking the sheet side edge when the suction cup picks the sheet upwards. When the suction cup sucks the uppermost sheet, the sheet may be pulled down, and the elastic pulling piece 14 is provided, so that the following sheet which should not be gripped can be separated by the elastic pulling of the pulling piece portion. The resilient fingers 14 are made of thin metal sheet.

The linear driving device 2 includes a linear slide rail and a linear driving mechanism, the seat body 31 is slidably mounted on the linear slide rail along the direction of the linear slide rail, and the seat body 31 is driven by the linear driving mechanism to move linearly along the left and right directions. The seat body 31 is driven by a synchronous belt, the synchronous belt is driven by a servo motor, and the synchronous belt and the linear slide rail are both arranged in the cover body 21. The synchronous belt is provided with a transmission block and is in transmission connection with the seat body 31, and the driving principle of the synchronous belt belongs to the prior art. Of course, the base body can also be driven by a horizontally arranged screw mechanism, and the servo motor drives the screw mechanism to drive the base body to move linearly.

Printing platform 5 includes the printing frame and sets up printing host 6, the cargo platform 7 in the printing frame, and printing host 6 includes crossbeam 61 and the printing head 62 of sliding fit on the printing frame from top to bottom, is equipped with the leading rail that the level was arranged on crossbeam 61, and printing head 62 is along left right direction sliding fit on leading rail. Crossbeam and printing head portion belong to prior art.

As shown in fig. 6 and 7, the present invention has a modification to the loading platform 7, and the two adjacent sides of the loading platform 7 are respectively provided with a first positioning assembly and a second positioning assembly; the first positioning assembly includes a first positioning cylinder 75, and a first positioning pin 740 driven by the first positioning cylinder 75, the first positioning pin 740 being as shown in fig. 11. The second positioning assembly comprises a second positioning cylinder 76 and a second positioning thimble 710 driven by the second positioning cylinder 76. The second positioning pin 740 is shown in fig. 11. The loading platform 7 is provided with a through hole for the first positioning thimble 740 and the second positioning thimble 710 to pass through, and the first positioning cylinder 75 and the second positioning cylinder 76 are located below the loading platform 7.

The first positioning thimble 740 and the second positioning thimble 710 both have an initial position and an ejection position, and are located at the ejection position, and the first positioning thimble 740 and the second positioning thimble 710 position two adjacent sides of the placed sheet; in the initial position, the upper ends of the first positioning pin 740 and the second positioning pin 710 are retracted into the through hole.

The through holes corresponding to the first positioning pins 740 are denoted as first through holes 74, 5 first through holes 74 are arranged side by side, and the first through holes 74 are inclined slots penetrating vertically. The through hole corresponding to the second positioning thimble 710 is denoted as a second through hole 71, the second through hole 71 is disposed on a side of the loading platform 7 close to the blanking device 9, and the first through hole 74 is inclined toward the second through hole 71. The second perforations 71 are arranged in an L-shape with respect to the line of distribution of the first perforations 74 to position the adjacent edges of the sheet.

The first positioning cylinders 75 are arranged on a slant push plate 70, and the number of the first positioning cylinders 75 is 5, and only 4 are shown in the figure. The inclined push plate 70 is connected with an inclined push plate driving mechanism, and the moving direction of the inclined push plate 70 is consistent with the inclined direction of the inclined chute. The inclined plate driving mechanism comprises a stepping motor 77 and a lead screw 78 in transmission connection with the stepping motor 77, and the other end of the lead screw 78 is assembled with a nut seat 79 arranged on the inclined push plate 70. The stepping motor 77 drives the lead screw 78 to rotate, the lead screw 78 drives the nut seat 79, i.e., the inclined push plate, to move linearly, and finally drives the first positioning thimble 740 to move in the first through hole 74, i.e., the inclined groove. The elevation of the first positioning pin 740 is controlled by the first positioning cylinder 75.

A discharging thimble hole 72 is formed in one side, close to the discharging device 9, of the carrying platform 7, a discharging thimble is arranged below the carrying platform 7, the discharging thimble is driven by a discharging cylinder and moves up and down along the discharging thimble hole 72, and the discharging thimble has an initial position and a discharging position when being ejected upwards; the discharging thimble hole 72 and the second through hole 71 are arranged side by side, and the distance from the discharging thimble hole 72 to the blanking device 9 is larger than the distance from the second through hole 71 to the blanking device 9. When printing, the discharging thimble hole 72 is just shielded by the sheet, after printing is completed, the discharging thimble upwards can jack up the right part of the sheet, and the material taking manipulator 92 of the discharging device 9 is convenient to grab. The discharging thimbles can be two or three and are arranged at intervals in the front and the back. One second perforation 71 is provided in the present embodiment, but two perforations arranged at intervals may be provided.

The utility model discloses the optimal design has still been done to the mounting structure of half tone for the half tone can finely tune around. As shown in fig. 10 and 8, a pair of screen mounting frames is provided on a beam 61 of the printer frame, and each screen mounting frame includes an L-shaped support arm 63, a screen clamp 83, and a screen front-rear fine adjustment structure 8. The screen clamps 83 are U-shaped plates, and two opposite screen clamps are used for clamping the screens, which are not shown in the figure. The fine adjustment structure 8 comprises a first guide rail 81 and a second guide rail 82 extending in the front-back direction, and the first guide rail 81 and the second guide rail 82 are in sliding fit through a dovetail groove. The first guide rail 81 is fixedly connected to the L-shaped support arm 63, and the screen clamp 83 is attached to the second guide rail 82 on the side facing away from the first guide rail 81. The front part of the stencil holder 83 is provided with a fine adjustment mounting block 85, an adjusting screw 84 is arranged on the fine adjustment mounting block 85, and one end of the adjusting screw 84 is spirally assembled on the first guide rail 81. The front end of the adjusting screw 84 is provided with a scale handle 86, and a circle of scales are arranged on the scale handle 86 for adjustment reference. When required, the scale handle 86 is operated clockwise or anticlockwise, so that the second guide rail 82 can be driven to slide in the front-back direction relative to the first guide rail 81, the front-back position of the screen printing plate is adjusted, and fine adjustment is realized, so that the printing precision is ensured.

As shown in fig. 1, the blanking device 9 includes a blanking frame and a conveying belt 91 disposed on the blanking frame and used for conveying printed sheets, a material taking manipulator 92 is disposed on the blanking frame, and the material taking manipulator 92 is used for grabbing the printed sheets onto the conveying belt 91. In this embodiment, the material grasping portion of the material taking manipulator 92 is of a nozzle type. The material taking manipulator is in the prior art, such as model QL1500A or QL1500B sold by Shenzhen Shanghai Shenshu Silk screen printing apparatus Limited.

The utility model discloses automatic go up the theory of operation of unloading sheet silk screen printing machine:

the lifting base is adjusted to a suitable height, a stack of sheets to be printed is placed on the horizontal plate body 121 of the lifting base, and the sheets are aligned and positioned by the positioning plate. The sucking disc descends to suitable position, and a plurality of vacuum suction nozzle on the sucking disc snatch the sheet of the superiors, snatch the back, and the sucking disc rises under elevating gear 3's drive, then under servo motor, hold-in range's drive, moves towards printing platform 5 direction along linear slide rail, when moving to the settlement position in objective platform 7 top, the sucking disc unloads the sheet to objective platform 7 on. Then, the positioning assembly of the loading platform 7 performs positioning processing on the sheet, specifically:

the first positioning pin 740 is located at an end of the first through hole 74 close to the front portion of the carrier platform 7 in advance, and the first pin and the second pin are located at the ejection position. The stepping motor 77 drives the inclined push plate 70 to drive the first positioning thimble 740 to move along the inclined direction of the first through hole 74, the first positioning thimble 740 contacts with the front side of the sheet material 100 and pushes the sheet material 100 to the right and back (the first positioning thimble 740 generates a pushing component force to the sheet material 100 to the right and back), after the right side of the sheet material 100 contacts with the second positioning thimble 710, the second positioning thimble 710 limits the right side of the sheet material 100, and each first positioning thimble continues to push the sheet material to a set position. When the sheet 100 reaches the set position, it is sensed by the position sensor attached to the sensor attachment hole 73. The position sensor (arranged at the sensor mounting hole 73 of the object platform 7) feeds back a signal of the material placement to the printer head to start printing. When printing is started, the first positioning pin 740 and the second positioning pin 710 descend to return to the initial position, so as to avoid affecting the operation of the screen printing plate. The principle of positioning the sheet is shown in fig. 11.

After printing is completed, the discharging ejector pin is driven by the discharging air cylinder to be ejected upwards from the discharging ejector pin hole 72 so as to jack up part of the sheet, the sheet is away from the upper side surface of the carrying platform 7, the material taking manipulator 92 can stretch into the discharging ejector pin, and then the sheet is grabbed by the material taking manipulator 92. The material taking robot 92 moves straight to the right, places the printed sheet on the conveyor belt 91, and the material taking robot 92 then resets to prepare for gripping the next sheet.

The utility model discloses unloading sheet silk screen printing machine in automation can realize unloading in the automation, automatic printing, and degree of automation is high. And through setting up automatic positioning assembly, can guarantee to place the position degree of accuracy of sheet at every turn, automatic alignment raises the efficiency, improves the printing precision.

Example 2:

the automatic feeding and discharging sheet silk screen printing machine of the embodiment is different from the embodiment 1 in that the feeding device 1, the printing platform and the discharging device are arranged from right to left, that is, the feeding and discharging direction is just opposite to that of the embodiment 1. The distribution positions of the first positioning assembly and the second positioning assembly of the corresponding carrying platform are adjusted. Fig. 12 is a schematic view showing a change in position of the sheet during the positioning.

The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

Claims

1. Automatic go up unloading sheet silk screen printing machine, including loading attachment, loading attachment is including the lift seat that is used for placing the sheet of treating the printing, its characterized in that: the printing machine further comprises a grabbing and feeding device, a printing platform and a discharging device, wherein the grabbing and feeding device comprises a sucker mechanism, a lifting device and a linear driving device;

the first positioning component comprises a first positioning cylinder and a first positioning thimble driven by the first positioning cylinder, the second positioning component comprises a second positioning cylinder and a second positioning thimble driven by the second positioning cylinder, a through hole for the first positioning thimble and the second positioning thimble to pass through is arranged on the carrying platform, and the first positioning cylinder, the second positioning thimble and the first positioning cylinder are arranged on the carrying platform in a vertical direction,

The second positioning cylinder is positioned below the loading platform;

2. The automatic feeding and discharging sheet screen printing machine of claim 1, wherein: the sucking disc comprises a supporting plate body and a plurality of suction nozzle mounting arms which are distributed on the supporting plate body and used for mounting suction nozzles, and the supporting plate body is connected with the sucking disc supporting arms; a plurality of long holes are formed in the supporting plate body, and one end of the suction nozzle mounting arm is fixed to the position, corresponding to the long holes, of the supporting plate body.

3. The automatic feeding and discharging sheet screen printing machine of claim 2, wherein: the long holes comprise a transverse long hole, a longitudinal long hole and an inclined long hole according to the extending direction.

4. The automatic feeding and discharging sheet screen printing machine of claim 1, wherein: the feeding device further comprises a feeding rack, the lifting seat is arranged on the feeding rack, an elastic shifting sheet is further arranged on the feeding rack, one end of the elastic shifting sheet is fixed with the feeding rack, and the other end of the elastic shifting sheet is suspended and is an elastic end; the elastic end of the elastic shifting piece is formed with a shifting piece part which is used for shifting the side edge of the sheet when the sucking disc upwards grabs the sheet.

5. The automatic feeding and discharging sheet screen printing machine of claim 1, wherein: the through hole corresponding to the second positioning thimble is marked as a second through hole, the second through hole is arranged on one side, close to the blanking device, of the loading platform, and the inclination direction of the first through hole faces the second through hole.

6. The automatic feeding and discharging sheet screen printing machine of claim 1, wherein: a discharging thimble hole is formed in one side, close to the discharging device, of the carrying platform, a discharging thimble is arranged below the carrying platform and driven by a discharging cylinder, the discharging thimble moves up and down along the discharging thimble hole, and the discharging thimble has an initial position and a discharging position when the discharging thimble is ejected upwards; the discharging thimble hole and the second through hole are arranged side by side, and the distance between the discharging thimble hole and the discharging device is larger than the distance between the second through hole and the discharging device.

7. The automatic feeding and discharging sheet screen printing machine of claim 1, wherein: be equipped with a pair of half tone mounting bracket in the printing frame, half tone mounting bracket includes L type support arm, half tone clamp and half tone around finely tuning structure, and finely tuning structure includes first guide rail, the second guide rail that the fore-and-aft direction extends around the half tone, and first guide rail passes through dovetail sliding fit with the second guide rail, first guide rail and L type support arm fixed connection, and the one side-mounting of the first guide rail is dorsad in the second guide rail half tone clamp, half tone clamp front portion are equipped with the fine setting installation piece, are equipped with accommodate the lead screw on the fine setting installation piece, accommodate the lead screw one end spiral assembly on first guide rail.