A fan-shaped screen printing machine

Abstract

The present invention discloses a fan-shaped screen printing machine, including a main support frame, a main motor, a nozzle clamping device, a conveying device, a printing position clamping frame and a printing device; the main motor transmits power to the nozzle clamping device and the conveying device through a first cam and a second cam respectively; the printing device includes a printing support, a printing seat, a printing scraper mechanism and a screen mechanism, the printing support is fixedly connected to the main support frame, and the two ends of the printing seat are installed on the inner side of the printing support; the screen mechanism specifically includes an arc-shaped printing screen, a clamping device, a crossbeam and an axial connecting plate; the printing scraper execution unit further includes an ink scraper and an ink return knife, and the upper parts of the ink scraper and the ink return knife are respectively connected to an ink scraper cylinder and an ink return cylinder. The motion trajectory of the printing scraper of the present invention is an arc shape, so that the printing area is fan-shaped, and the arc-shaped screen printing screen is used to print pictures and texts on a conical object, which has the characteristics of simple structure, high printing accuracy, high degree of automation and high efficiency.

Description

Technical Field

[0001] The invention relates to the field of printing equipment, in particular to a fan-shaped screen printer for printing conical products. Background Art

[0002] Screen printing consists of five major elements, namely, screen printing plate, squeegee, ink, printing table and substrate. The basic principle of screen printing is to use the basic principle that the mesh of the image part of the screen printing plate allows ink to pass through, while the mesh of the non-image part does not allow ink to pass through.

[0003] Screen printing is widely used due to its wide range of applications, good quality, and low cost. However, existing screen printers can only print cylindrical or flat objects, and there is no good solution for printing on the surface of conical objects. Usually, screen printers for cylindrical objects are used for printing, and then they are cut and adjusted. Therefore, there are problems such as low printing accuracy, easy deformation of patterns, and low efficiency. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a fan-shaped screen printing machine, the motion trajectory of the printing scraper is arc-shaped, so that the printing area is fan-shaped, and with the arc-shaped screen printing plate, the image and text are printed on the conical object, which has the characteristics of simple structure, high printing accuracy, high degree of automation and high efficiency. It is achieved through the following technical solutions:

[0005] A fan-shaped screen printing machine comprises a main support frame, a main motor, a nozzle clamping device, a conveying device, a printing position clamping frame and a printing device; the main motor, the nozzle clamping device, the conveying device, the printing position clamping frame and the printing device are all installed on the main support frame.

[0006] The nozzle clamping device includes a first cam, and the conveying device includes a second cam; the main motor transmits power to the nozzle clamping device and the conveying device through the first cam and the second cam respectively; after the conveying device conveys the product to be printed to the printing position clamping frame, the conveying device continues to convey the printed product out; the nozzle clamping device is used to support the product to be printed during the transmission process.

[0007] The printing device comprises a printing support, a printing seat, a printing and scraping mechanism and a screen mechanism. The printing support is fixedly connected to the main support frame, and two ends of the printing seat are installed on the inner side of the printing support.

[0008] The printing and scraping mechanism and the screen mechanism are both installed on a printing base, and the printing base is provided with a bracket, on which a motor mounting plate and a first rotating motor are mounted, the first rotating motor is fixedly mounted on the motor mounting plate, and the output end of the first rotating motor is connected to a rotating block.

[0009] The screen mechanism specifically includes an arc-shaped printing screen, a clamping device, a crossbeam and an axial connecting plate; the clamping device includes a screen frame clamp and an adjusting clamp, the two ends of the arc-shaped printing screen are respectively clamped by the screen frame clamp, and the screen frame clamp is connected to the adjusting clamp, and the adjusting clamp is installed on the crossbeam.

[0010] The axial connecting plate is fixedly connected to the cross beam, and the axial connecting plate is fixedly mounted on the rotating block; the scraper mechanism is mounted above the arc-shaped printing screen, and the scraper mechanism includes a scraper fixing frame, a scraper adjustment block and a scraper execution unit, the scraper fixing frame is mounted on the printing seat, a scraper rod is provided on the scraper fixing frame, the scraper adjustment block is mounted on the scraper rod, and a third screw is connected between the scraper adjustment block and the scraper execution unit.

[0011] The printing and scraping execution unit further comprises an ink scraping blade and an ink returning blade, and the upper parts of the ink scraping blade and the ink returning blade are respectively connected with an ink scraping cylinder and an ink returning cylinder.

[0012] This technical solution can realize screen printing of conical bottles through high automation and convenient operation; through a main motor, combined with a nozzle clamping device and a conveying device, automatic and orderly conveying of the products to be printed is realized.

[0013] Preferably, the talk-back clamping device also includes a first swing arm, a first section arm, a first cross bar, a first curved arm, a first connecting block and a talk-back actuator, the middle portion of the first swing arm is hinged to the main support frame, one end of the first swing arm is abutted against the first cam, the other end of the first swing arm is hinged to one end of the first section arm, and the other end of the first section arm is hinged to the first cross bar.

[0014] The middle part of the first curved arm is hinged to the main support frame, one end of the first curved arm is hinged to the first cross bar, the other end of the first curved arm is placed in the opening of the first connecting block, and the first connecting block is fixedly installed on the back-talking actuator.

[0015] Preferably, it is characterized in that the back-talk actuator comprises a first sliding rod, a back-talk mounting frame and a plurality of back-talks, the back-talk mounting frame is fixedly mounted on the first sliding rod, and the plurality of back-talks are mounted side by side on the back-talk mounting frame.

[0016] Preferably, it is characterized in that the main support frame is also provided with a plurality of supporting top blocks matched with the top nozzles, and a supporting top plate, and the supporting top blocks or the supporting top plate and the top nozzles are used to clamp the product to be printed.

[0017] Preferably, the printing device also includes an adjusting handwheel, which is connected to the input end of a reducer, and the reducer is installed on the printing bracket; racks are respectively provided on the two end plates of the printing base, and the output end of the reducer is connected to a transmission rod with gears at both ends, and the racks are meshed with the gears.

[0018] Preferably, a first screw rod is also connected between the motor mounting plate and the bracket, and the first screw rod is used to adjust the relative distance between the motor mounting plate and the bracket; a second screw rod is installed between the axial connecting plate and the rotating block, and the second screw rod is used to adjust the relative distance between the axial connecting plate and the rotating block.

[0019] Preferably, the conveying device also includes a second swing arm, a second section arm, a telescopic arm and a conveying actuator, the middle part of the second swing arm is hinged to the main support frame, one end of the second swing arm is abutted against the first cam, and the other end of the second swing arm is hinged to one end of the second section arm; one end of the telescopic arm is hinged to one end of the second swing arm, and the other end of the telescopic arm is installed on the main support frame.

[0020] Preferably, the transmission actuator includes at least two transmission plates, at least two transmission brackets and at least two transmission brackets.

[0021] At least two conveying swing arms, the conveying plate is fixedly mounted on the conveying swing arm, the conveying bracket is mounted on the main support frame, one end of each conveying swing arm is hinged to the conveying bracket; the other end of the second section arm drives the conveying swing arm to swing back and forth.

[0022] Preferably, a first mechanical gripper and a second mechanical gripper are installed in the middle of one of the conveying plates, respectively located on both sides of the printing position clamping frame.

[0023] Preferably, the printing position clamping frame includes a printing position rotating top plate and a printing position driven top plate, the printing position rotating top plate is driven by a second rotating motor, the second rotating motor drives the printing position rotating top plate to rotate through a pulley, and the printing position driven top plate is fixedly connected to the nozzle mounting frame. When the product to be printed is clamped on the printing position clamping frame, the rotation of the printing position rotating top plate drives the rotation of the product to be printed, so that its surface can be screen-printed at multiple angles.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The technical solution has a high degree of automation and is easy to operate, and can realize screen printing on conical bottles; through a main motor, combined with a nozzle clamping device and a conveying device, automatic and orderly transportation of the products to be printed is realized; the printing device adopted in the technical solution has an arc-shaped printing screen plate, which can be rotated during printing so that the printing area is fan-shaped, and for screen printing on conical bottles, the effects of high printing accuracy, high degree of automation and high efficiency are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional diagram of the overall structure of the fan-shaped screen printing machine of the present invention;

[0027] Figure 2 It is a front view of the overall structure of the fan-shaped screen printing machine of the present invention;

[0028] Figure 3 The present invention Figure 2 A partial enlarged view of the middle A;

[0029] Figure 4 It is a partial structural stereogram of the fan-shaped screen printing machine of the present invention;

[0030] Figure 5 It is a partial structural front view of the fan-shaped screen printing machine of the present invention;

[0031] Figure 6 It is a structural diagram of the backtalk actuator of the present invention;

[0032] Figure 7 is a structural diagram of the transmission actuator of the present invention;

[0033] Figure 8 It is one of the structural diagrams of the printing device of the present invention;

[0034] Fig. 9 This is the second structural diagram of the printing device of the present invention;

[0035] Fig.10 It is the third structural diagram of the printing device of the present invention;

[0036] Fig.11 This is the fourth structural diagram of the printing device of the present invention.

[0037] Description of reference numerals:

[0038] 1 main support frame, 2 main motor, 3 back-mouth clamping device, 31 first cam, 32 first swing arm, 33 first section arm, 34 first cross bar, 35 first curved arm, 36 first connecting block, 37 first slide bar, 38 back-mouth mounting frame, 39 back-mouth, 4 transmission device, 41 second cam, 42 second swing arm, 43 second section arm, 44 telescopic arm, 45 transmission plate, 46 transmission bracket, 47 transmission swing arm, 48 first mechanical gripper, 49 second mechanical gripper, 5 printing device, 51 printing bracket, 52 printing seat, 521 bracket, 522 first rotating motor, 523 motor mounting plate, 52 4 rotating block, 525 first screw rod, 526 second screw rod, 527 transmission rod, 53 printing scraper mechanism, 531 printing scraper fixing frame, 532 printing scraper adjusting block, 533 ink scraper, 534 ink return knife, 535 third screw rod, 54 screen mechanism, 541 arc-shaped printing screen, 542 screen frame clamp, 543 adjusting fixture, 544 crossbeam, 545 axial connecting plate, 55 adjusting hand wheel, 56 reducer, 6 printing position clamping frame, 61 printing position rotating top plate, 62 printing position driven top plate, 63 second rotating motor, 7 supporting top block, 8 supporting top plate, 9 feeding robot, 10 discharging robot. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] A preferred embodiment of the present invention is as follows Figure 1-2 As shown, a fan-shaped screen printing machine includes a main support frame 1, a main motor 2, a nozzle clamping device 3, a conveying device 4, a printing position clamping frame 6 and a printing device 5; the main motor 2, the nozzle clamping device 3, the conveying device 4, the printing position clamping frame 6 and the printing device 5 are all installed on the main support frame 1.

[0043] like Figure 3-4 As shown, the nozzle clamping device 3 includes a first cam 31, and the conveying device 4 includes a second cam 41; the main motor 2 transmits power to the nozzle clamping device 3 and the conveying device 4 through the first cam 31 and the second cam 41 respectively; after the conveying device 4 conveys the product to be printed to the printing position clamping frame 6, the conveying device 4 continues to convey the printed product out; the nozzle clamping device 3 is used to support the product to be printed during the transmission process.

[0044] In actual applications, the main motor 2 transmits the driving force to the first cam 31 and the second cam 41 through a chain or belt, a sprocket or pulley, and cooperates with shaft components. The specific transmission components are commonly used in the field and are not the core invention of the present invention, so they will not be elaborated in detail.

[0045] like Figure 8-11 As shown, the printing device 5 includes a printing support 51, a printing seat 52, a printing and scraping mechanism 53 and a screen mechanism 54. The printing support 51 is fixedly connected to the main support frame 1, and both ends of the printing seat 52 are installed on the inner side of the printing support 51;

[0046] The printing and scraping mechanism 53 and the screen mechanism 54 are both installed on the printing base 52. The printing base 52 is provided with a bracket 521. The bracket 521 is installed with a motor mounting plate 523 and a first rotating motor 522. The first rotating motor 522 is fixedly installed on the motor mounting plate 523. The output end of the first rotating motor 522 is connected to a rotating block 524.

[0047] The screen mechanism 54 specifically includes a curved printing screen 541, a clamping device, a crossbeam 544 and an axial connecting plate 545; the clamping device includes a screen frame clamp 542 and an adjusting fixture 543, and both ends of the curved printing screen 541 are clamped by the screen frame clamp 542 respectively, and the screen frame clamp 542 is connected to the adjusting fixture 543, and the adjusting fixture 543 is installed on the crossbeam 544. Specifically, the screen frame clamp 542 can be connected to the adjusting fixture 543 by a hinge or a ball head, so that the screen frame clamp 542 can be universally adjusted to facilitate adjustment to the angle of the curved printing screen 541, and the adjusting fixture 543 can move on the crossbeam 544 to adapt to the curved printing screen 541 of different sizes.

[0048] The axial connecting plate 545 is fixedly connected to the crossbeam 544, and the axial connecting plate 545 is fixedly mounted on the rotating block 524. The scraper mechanism 53 is mounted above the arc-shaped printing screen 541, and the scraper mechanism 53 includes a scraper fixing frame 531, a scraper adjusting block 532, and a scraper execution unit. The scraper fixing frame 531 is mounted on the printing seat 52, a scraper rod is arranged on the scraper fixing frame 531, the scraper adjusting block 532 is mounted on the scraper rod, and a third screw rod 535 is connected between the scraper adjusting block 532 and the scraper execution unit.

[0049] The printing and scraping execution unit further includes an ink scraping blade 533 and an ink returning blade 534. The upper parts of the ink scraping blade 533 and the ink returning blade 534 are respectively connected to an ink scraping cylinder and an ink returning cylinder.

[0050] Specifically, Figure 3-4 The shown back-talk clamping device 3 also includes a first swing arm 32, a first section arm 33, a first cross bar 34, a first curved arm 35, a first connecting block 36 and a back-talk actuator. The middle part of the first swing arm 32 is hinged to the main support frame 1, one end of the first swing arm 32 is abutted against the first cam 31, the other end of the first swing arm 32 is hinged to one end of the first section arm 33, and the other end of the first section arm 33 is hinged to the first cross bar 34.

[0051] The middle part of the first curved arm 35 is hinged to the main support frame 1, one end of the first curved arm 35 is hinged to the first cross bar 34, and the other end of the first curved arm 35 is placed in the opening of the first connecting block 36, and the first connecting block 36 is fixedly installed on the back-talking actuator.

[0052] Specifically, Figure 6 As shown, the back-talk actuator includes a first slide bar 37 , a back-talk mounting frame 38 and a plurality of back-talks 39 . The back-talk mounting frame 38 is fixedly mounted on the first slide bar 37 , and the plurality of back-talks are mounted on the back-talk mounting frame 38 in parallel.

[0053] The function of the back-spout clamping device 3 is as follows: under the drive of the first cam 31, the power is transmitted through the first swing arm 32 and the first section arm 33, so that the first cross bar 34 performs lateral reciprocating motion, so that the first curved arm 35 drives the first connecting block 36 to perform longitudinal reciprocating motion. Since the first connecting block 36 is fixedly connected to the first sliding rod 37, the first sliding rod 37 drives the back-spout actuator to realize reciprocating motion, that is, the back-spout 39 realizes reciprocating motion under the drive of the first cam 31.

[0054] Specifically, the main support frame 1 is also provided with a plurality of support top blocks 7 matched with the top nozzle 39, and a support top plate 8, and the support top block 7 or the support top plate 8 and the top nozzle 39 are used to clamp the product to be printed. The support top block 7 is located at the feeding place of the product to be printed, there are a plurality of support top blocks 7, and the support top plate 8 and the support top block 7 are at the same horizontal position.

[0055] Specifically, the printing device 5 also includes an adjusting handwheel 55, which is connected to the input end of a reducer 56, and the reducer 56 is installed on the printing bracket 51; racks are respectively provided on the two end plates of the printing base 52, and the output end of the reducer 56 is connected to a transmission rod 527 with gears at both ends, and the rack is meshed with the gear, so that the height adjustment of the printing base 52 is achieved by adjusting the handwheel 55.

[0056] Specifically, Fig. 9 and 11 As shown, a first screw rod 525 is connected between the motor mounting plate 523 and the bracket 521, and the first screw rod 525 is used to adjust the relative distance between the motor mounting plate 523 and the bracket 521; a second screw rod 526 is installed between the axial connecting plate 545 and the rotating block 524, and the second screw rod 526 is used to adjust the relative distance between the axial connecting plate 545 and the rotating block 524. The motor mounting plate 523 and the bracket 521 are both provided with threaded holes that match the first screw rod 525, and the axial connecting plate 545 and the rotating block 524 are provided with threaded holes that match the second screw rod 526, and two screw mechanisms are formed here.

[0057] Through the above arrangement, when the first rotating motor 522 drives the rotating block 524 to rotate, the arc-shaped printing screen 541 is driven to rotate; because the first screw rod 525 can adjust the relative distance between the motor mounting plate 523 and the bracket 521, the rotation center is adjusted after the position of the first rotating motor 522 is moved; after the first screw rod 525 is adjusted, the position of the screen mechanism 54 also changes at the same time, and the function of the second screw rod 526 is to restore the position of the screen mechanism 54 to its original position by adjusting the relative distance between the axial connecting plate 545 and the rotating block 524, so as to facilitate the silk screen printing work, that is, through the cooperation of the first screw rod 525 and the second screw rod 526, the rotation center of the arc-shaped printing screen 541 changes while the position of the arc-shaped printing screen 541 remains unchanged.

[0058] Specifically, the conveying device 4 also includes a second swing arm 42, a second section arm 43, a telescopic arm 44 and a conveying actuator. The middle part of the second swing arm 42 is hinged to the main support frame 1, one end of the second swing arm 42 is abutted against the first cam 31, and the other end of the second swing arm 42 is hinged to one end of the second section arm 43; one end of the telescopic arm 44 is hinged to one end of the second swing arm 42, and the other end of the telescopic arm 44 is installed on the main support frame.

[0059] Specifically, Figure 7 As shown, the transmission actuator includes at least two transmission plates 45, at least two

[0060] A conveying bracket 46 and at least two conveying swing arms 47 , a conveying plate 45 is fixedly mounted on the conveying swing arms 47 , the conveying bracket 46 is mounted on the main support frame 1 , and one end of each conveying swing arm 47 is hinged to the conveying bracket 46 .

[0061] Furthermore, the other end of the second section arm 43 drives the transmission swing arm 47 to swing back and forth.

[0062] In order to facilitate the placement of the products to be printed, a plurality of support openings are provided on the conveying plate 45 , and the support openings may be “V”-shaped, “U”-shaped or arc-shaped.

[0063] With such arrangement, the conveying device 4 is driven by the second cam 41, through the transmission of the second swing arm 42, the second section arm 43, and the telescopic arm 44, and the conveying swing arm 47 realizes rotary reciprocating motion, and finally the conveying plate 45 moves left and right while also moving up and down.

[0064] The left-right movement of the conveying plate 45 enables the product to be printed to be moved from the feeding end to the discharging end, and the movement process from bottom to top of the conveying plate 45 enables the product to be printed to be placed in the support opening.

[0065] The conveying process is described in conjunction with the above-mentioned back nozzle 39 and the supporting top block 7 or the supporting top plate 8:

[0066] In the initial stage, the product to be printed is placed in the ath support opening of the conveying plate 45. While the conveying plate 45 moves from left to right, it also moves from bottom to top. At this time, since the nozzle 39 continuously reciprocates longitudinally under the action of the first cam 31, the product to be printed is clamped by the bth nozzle 39 and the bth support top block 7; thereafter, when the conveying plate 45 reciprocates for one cycle, the nozzle 39 also reciprocates once, and the product to be printed falls from the bth nozzle 39 and is placed in the a+1th support opening of the conveying plate 45. Thereafter, it is clamped by the b+1th nozzle 39 and the b+1th support top block 7, so that the product to be printed moves forward one nozzle position in the direction from feeding to discharging; it should be noted that the support top block 7 is located behind the support top plate 8, and the product to be printed at the rear end will be clamped between the nozzle 39 and the support top plate 8.

[0067] Specifically, Figure 7 As shown, a first mechanical gripper 48 and a second mechanical gripper 49 are installed in the middle of one of the conveying plates 45 , and are respectively located on both sides of the printing position clamping frame 6 .

[0068] Specifically, Figure 5As shown, the printing position clamping frame 6 includes a printing position rotating top plate 61 and a printing position driven top plate 62. The printing position rotating top plate 61 is driven by a second rotating motor 63. The second rotating motor 63 drives the printing position rotating top plate 61 to rotate through a pulley. The printing position driven top plate 62 is fixedly connected to the nozzle mounting frame 38.

[0069] When the product to be printed is clamped on the printing position clamping frame 6, the rotation of the printing position rotating top plate 61 drives the product to be printed to rotate, so that its surface can be screen-printed at multiple angles.

[0070] In order to make the function of the present invention more perfect, a feeding robot 9 and a discharging robot 10 are respectively installed on both sides of the main support frame 1. The function of the feeding robot 9 is to clamp the product to be printed and place it on the conveying plate 45, and the function of the discharging robot 10 is to unload the printed product from the conveying plate 45 of the fan-shaped screen printing machine of the present invention and place it in the storage device. The feeding robot 9 and the discharging robot 10 are obtained from the prior art, and since they are not the innovation of the present invention, they are not introduced in detail.

[0071] The working principle of the present technical solution is as follows: the feeding robot 9 continuously places the product to be printed on the support opening of the conveying plate 45, and under the drive of the main motor 2, the first cam 31 drives the top nozzle 39 to make longitudinal reciprocating motion, and the second cam 41 drives the conveying plate 45 to make rotary reciprocating motion. The product to be printed is clamped by the top nozzle 39 and the supporting top block 7 or the supporting top plate 8, and gradually moves forward until it moves to the first mechanical gripper 48, and the product to be printed by the first mechanical gripper 48 is transported to the printing position clamping frame 6; at this time, the printing device 5 starts to work, and the arc-shaped printing screen 541 rotates relative to a fulcrum driven by the first rotating motor 522, and at the same time, the scraper 533 contacts the arc-shaped printing screen 541, and the second rotating motor 63 drives the supporting top block 7 to rotate, thereby driving the product to be printed to rotate, so as to realize printing the pattern on the arc-shaped printing screen 541 on the product.

[0072] Subsequently, the second mechanical gripper 49 takes the printed product from the printing position clamping frame 6 and delivers it to the conveyor plate 45. As the conveyor plate 45 rotates and reciprocates, the printed product is intermittently clamped by the nozzle 39 and the supporting top plate 8 and transported to the end of the conveyor plate 45. Finally, it is output through the discharging robot 10.

[0073] The above are only preferred specific implementations of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fan-shaped screen printing machine, characterized in that: It includes a main support frame, a main motor, a back-spout clamping device, a conveying device, a printing position clamping frame and a printing device; the main motor, the back-spout clamping device, the conveying device, the printing position clamping frame and the printing device are all installed on the main support frame; the back-spout clamping device includes a first cam, and the conveying device includes a second cam; the main motor transmits power to the back-spout clamping device and the conveying device through the first cam and the second cam respectively; the back-spout clamping device also includes a first swing arm, a first section arm, a first cross bar, a first curved arm, a first connecting block and a back-spout actuator, the middle part of the first swing arm is hinged to the main support frame, one end of the first swing arm is abutted against the first cam, and the other end of the first swing arm is abutted against the first section arm. One end is hinged, and the other end of the first section arm is hinged to the first cross bar; the middle part of the first curved arm is hinged to the main support frame, one end of the first curved arm is hinged to the first cross bar, and the other end of the first curved arm is placed in the opening of the first connecting block, and the first connecting block is fixedly installed on the back-mouth actuator. The conveying device also includes a second swing arm, a second section arm, a telescopic arm and a conveying actuator. The middle part of the second swing arm is hinged to the main support frame, one end of the second swing arm abuts against the first cam, and the other end of the second swing arm is hinged to one end of the second section arm; one end of the telescopic arm is hinged to one end of the second swing arm, and the other end of the telescopic arm is installed on the main support frame. The conveying actuator includes at least two conveying plates, at least two conveying plates, and at least two conveying plates. A conveying bracket and at least two conveying swing arms, the conveying plate is fixedly mounted on the conveying swing arm, the conveying bracket is mounted on the main support frame, one end of each conveying swing arm is hinged to the conveying bracket; the other end of the second section arm drives the conveying swing arm to swing back and forth, a first mechanical gripper and a second mechanical gripper are installed in the middle of one of the conveying plates, which are respectively located on both sides of the printing position clamping frame, the back-nozzle actuator comprises a first slide bar, a back-nozzle mounting frame and a plurality of back-nozzles, the back-nozzle mounting frame is fixedly mounted on the first slide bar, a plurality of back-nozzles are mounted side by side on the back-nozzle mounting frame, the main support frame is also provided with a plurality of supporting top blocks and a supporting top plate that cooperate with the back-nozzles, the supporting top blocks or the supporting top plate and the back-nozzles The feeding robot continuously places the products to be printed on the supporting opening of the conveyor plate. Driven by the main motor, the first cam drives the nozzle to make longitudinal reciprocating motion, and the second cam drives the conveyor plate to make rotary reciprocating motion. The products to be printed are clamped by the nozzle and the supporting top block or the supporting top plate and gradually move forward until they are moved to the first mechanical gripper, and the products to be printed by the first mechanical gripper are transported to the printing position clamping frame. The second mechanical gripper takes the printed products from the printing position clamping frame and delivers them to the conveyor plate. Under the rotary reciprocating motion of the conveyor plate, the printed products are intermittently clamped by the nozzle and the supporting top plate and transported to the end of the conveyor plate. Finally, they are output by the discharging robot.

2. The fan-shaped screen printing machine according to claim 1, characterized in that: The printing device comprises a printing support, a printing seat, a printing scraper mechanism and a screen mechanism, the printing support is fixedly connected to the main support frame, and the two ends of the printing seat are installed on the inner side of the printing support; The printing and scraping mechanism and the screen mechanism are both installed on a printing seat, the printing seat is provided with a bracket, a motor mounting plate and a first rotating motor are installed on the bracket, the first rotating motor is fixedly installed on the motor mounting plate, and an output end of the first rotating motor is connected to a rotating block; The screen mechanism specifically includes a curved printing screen, a clamping device, a crossbeam and an axial connecting plate; the clamping device includes a screen frame clamp and an adjusting fixture, the two ends of the curved printing screen are clamped by the screen frame clamp respectively, and the screen frame clamp is connected to the adjusting fixture, and the adjusting fixture is installed on the crossbeam; The axial connecting plate is fixedly connected to the cross beam, and the axial connecting plate is fixedly mounted on the rotating block; The scraper mechanism is installed above the arc-shaped printing screen, and the scraper mechanism includes a scraper fixing frame, a scraper adjusting block and a scraper execution unit. The scraper fixing frame is installed on the printing seat, and a scraper rod is arranged on the scraper fixing frame. The scraper adjusting block is installed on the scraper rod, and a third screw rod is connected between the scraper adjusting block and the scraper execution unit. The printing and scraping execution unit further comprises an ink scraping blade and an ink returning blade, and the upper parts of the ink scraping blade and the ink returning blade are respectively connected with an ink scraping cylinder and an ink returning cylinder.

3. The fan-shaped screen printing machine according to claim 2, characterized in that: The printing device also includes an adjusting hand wheel, which is connected to the input end of a reducer, and the reducer is installed on the printing bracket; racks are respectively provided on the two end plates of the printing base, and the output end of the reducer is connected to a transmission rod with gears at both ends, and the racks are meshed with the gears.

4. The fan-shaped screen printing machine according to claim 2 or 3, characterized in that: A first screw is also connected between the motor mounting plate and the bracket, and the first screw is used to adjust the relative distance between the motor mounting plate and the bracket; a second screw is installed between the axial connecting plate and the rotating block, and the second screw is used to adjust the relative distance between the axial connecting plate and the rotating block.

5. The fan-shaped screen printing machine according to claim 1, characterized in that: The printing position clamping frame includes a printing position rotating top plate and a printing position driven top plate. The printing position rotating top plate is driven by a second rotating motor. The second rotating motor drives the printing position rotating top plate to rotate through a pulley. The printing position driven top plate is fixedly connected to the nozzle mounting frame.

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