CN110126160B

CN110126160B - Printing type efficient production process for melamine tableware

Info

Publication number: CN110126160B
Application number: CN201910433669.2A
Authority: CN
Inventors: 江涛; 张良勇
Original assignee: Suzhou Yongda Melamine Products Co ltd
Current assignee: Suzhou Yongda Melamine Products Co ltd
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2021-06-22
Anticipated expiration: 2039-05-23
Also published as: CN110126160A

Abstract

The invention relates to the technical field of melamine product processing, and discloses a printing type efficient production process for melamine tableware, which comprises the following steps: (1) pre-treatment of pressing; (2) pressing tableware; (3) pressing and post-processing; (4) marking: a. inputting a trademark pattern to be printed into a laser marking machine, and then placing tableware to be marked on a storage platform of the laser marking machine; b. adjusting the position of the tableware according to the marking position of the tableware, the thickness of the tableware and the optimal focal length of the laser marking machine; c. starting a printing process of the laser marking machine after calibration; d. and (c) replacing the tableware and repeating the steps a-c until all the tableware is marked. The laser marking machine is adopted to print the patterns on the tableware, the printing process is within 1s-30s, the traditional processes of printing, cutting, coating with the gloss powder, drying and secondary pressing of stained paper are omitted, the forming speed of the trademark is greatly improved, and the production efficiency is improved.

Description

Printing type efficient production process for melamine tableware

Technical Field

The invention relates to the technical field of melamine product processing, in particular to a printing type efficient production process for melamine tableware.

Background

Melamine tableware, also known as porcelain-like tableware, is formed by heating, pressurizing and pressing melamine resin powder; melamine tableware is used in catering industry, children's diet industry, etc. because of its light weight, beautiful appearance, low temperature resistance, and non-fragility. Melamine tableware has been produced at home and abroad for decades, and the principle of producing the melamine tableware is basically that melamine raw materials are heated at a certain temperature and under a certain pressure to carry out polycondensation reaction, and the melamine raw materials are cured and formed after being exhausted.

At present, the Chinese patent with the publication number of CN101670640A discloses a production method of applique gold added melamine tableware, which is realized by the following steps:

firstly, melamine primary product molding:

1) preheating equipment: preheating an upper die of a die to 165-180 ℃, and preheating a lower die of the die to 150-165 ℃;

2) weighing melamine raw materials: accurately weighing 100% of the melamine raw material required by each product;

3) preheating raw materials: putting the weighed raw materials into a charging container, and then putting the charging container on a preheating machine for preheating for 30-40 seconds to ensure that the temperature of the raw materials is raised to 40-50 ℃;

4) feeding: putting the preheated raw materials into the preheated mould in the step (1);

5) initial pressing: pressurizing the raw materials in the mold, wherein the pressurizing pressure is 150-190kgf/cm2, and the pressurizing time is 1-8 seconds; starting the raw materials to flow at a certain temperature and pressure, carrying out polycondensation reaction and generating gas;

6) exhausting: slightly opening the die for 0.5-3 seconds to discharge gas generated during initial pressure;

7) and (3) pressurizing and curing: after exhausting, closing the mold and pressurizing, wherein the pressurizing pressure is 150-190kgf/cm2, the pressurizing time is 10-45 seconds, molding the product, and opening the mold to obtain the initial product;

second, sticking flower and adding gold process

1) Applique: pasting stained paper on the inner wall or the outer wall of the primary product according to the design requirement;

2) initial pressing: placing the applique initial product into a mould to be pressurized, wherein the pressurization pressure is 100-;

3) exhausting: slightly opening the die for 0.3-1 second, and discharging gas generated during pressurization;

4) and (3) decal solidification and pressurization: after exhausting, closing the mould and pressurizing, wherein the pressurizing pressure is 100-150kgf/cm2, and the time is 10-30 seconds, so as to prepare the applique product;

5) opening the mould, and adding gold on the inner wall or the outer wall of the applique melamine tableware according to the design requirement;

6) putting the product added with gold into a mould for pressurization, wherein the pressurization pressure is 120-;

7) slightly opening the die for 0.5-1 second to discharge gas generated during pressurization;

8) after exhausting, closing the mold and pressurizing with the pressurizing pressure of 120-180kgf/cm2 for 30-50 seconds, and opening the mold to obtain the gold-coated melamine tableware.

The technical scheme controls the discharge time of the gas generated in the processing process to fully discharge the gas generated in the production process of the product; the damage of the product to the body of the user in the using process is avoided. But has the following disadvantages: the decal method requires a plurality of processes to press the pattern on the surface of the tableware, and the production efficiency is low.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a printing type efficient production process of melamine tableware, which adopts laser to realize quick marking and improves the production efficiency of the tableware.

The technical purpose of the invention is realized by the following technical scheme: a printing type efficient production process of melamine tableware comprises the following steps:

(1) pre-treatment of pressing: starting and preheating the equipment, weighing the raw materials and then preheating;

(2) pressing tableware: pouring the raw materials onto a lower die of a compression molding machine, starting compression, and laminating an upper die and the lower die to compress and mold the tableware;

(3) and (3) pressing post-treatment: grinding and polishing the product;

(4) marking:

a. inputting a trademark pattern to be printed into a laser marking machine, and then placing tableware to be marked on a storage platform of the laser marking machine;

b. adjusting the position of the tableware according to the marking position of the tableware, the thickness of the tableware and the optimal focal length of the laser marking machine;

c. starting a printing process of the laser marking machine after calibration;

d. and (c) replacing the tableware and repeating the steps a-c until all the tableware is marked.

By adopting the technical scheme, the pattern is printed on the tableware by adopting the laser marking machine, the printing process is different according to the complexity of the pattern and is between 1s and 30s, the traditional processes of printing, cutting, coating with gloss powder, drying and secondary pressing of stained paper are omitted, the forming speed of the trademark is greatly improved, and the production efficiency is improved.

The laser marking machine further comprises a workbench in the step (4), a support and the object placing platform are fixed on the workbench, a laser emitter is connected onto the support in a sliding mode, the object placing platform comprises a base fixed with the workbench, a first platform is connected onto the base in a sliding mode, a second platform is connected onto the first platform in a sliding mode, the sliding directions of the first platform and the second platform are mutually perpendicular, a cross plate used for placing tableware is arranged on the second platform, a plurality of threaded holes are formed in the cross plate, screws used for supporting the tableware are matched on the threaded holes in a threaded mode, and each tableware is limited by 3-5 screws.

By adopting the technical scheme, the laser emitter is slidably arranged on the bracket, so that an operator can conveniently adjust the distance between the tableware and the laser emitter; the first platform and the second platform are connected in a sliding manner in two directions of a horizontal plane, so that an operator can conveniently adjust the position of the tableware and align the tableware with the laser emitter in the vertical direction; and the support to the tableware has been realized to the cooperation of screw hole and screw, and 3 screws can accomplish the location and the support that the contact surface is planar tableware, and 5 screws can accomplish the location and the support that the contact surface is the tableware of curved surface, and the time of fixed tableware has been saved to the restriction of screw quantity in furthest, and just the same batch of tableware need be placed between the screw that has adjusted, has improved the change speed of tableware to production efficiency has further been improved.

The invention is further provided that a host computer electrically connected with the laser emitter is arranged on the lower side of the workbench, a display electrically connected with the host computer is arranged on the workbench, a portable projector used for projecting a pattern to be printed on tableware is arranged on the laser emitter, and the portable projector is electrically connected with the host computer.

Through adopting above-mentioned technical scheme, all be connected laser emitter, display and portable projecting apparatus with the host computer electricity for pattern information can be transmitted, demonstration between four, and portable projecting apparatus can be with treating the pattern projection of printing to the tableware on, plays the preview effect, and the size and the definition of the operating personnel adjustment pattern of being convenient for reach the production requirement with this, satisfy customer's demand.

The invention is further provided that the laser emitter is provided with a laser ranging sensor for measuring the distance between the surface of the tableware and the laser emitter, and the laser ranging sensor is electrically connected with the host and the display.

Through adopting above-mentioned technical scheme, utilize laser rangefinder sensor accurate detection tableware to wait the surface of printing and laser emitter's interval, the laser emitter adjustment focal length of being convenient for to ensure the accuracy nature of the pattern of printing out.

The invention is further configured that, in the step (4), during calibration, the method comprises the following steps:

J1. comparing the distance measured by the laser ranging sensor with the optimal focal distance range of the laser transmitter;

J2. starting the portable projector, projecting the pattern to be printed on the tableware, and checking whether the size of the required trademark is met and the pattern definition is qualified;

J3. and when the J1 and the J2 both meet the printing requirements, starting the laser emitter to perform pre-printing, printing 2s-5s or 1/3-1/2 of the printed pattern, and checking whether the pattern meets the requirements.

Through adopting above-mentioned technical scheme, the pattern of treating the printing of two kinds of different calibration modes of application laser rangefinder sensor and portable projecting apparatus is adjusted to whether carry out the preprinting earlier so that the inspection pattern accords with the production requirement, thereby ensure the yields, and preprinting consuming time is shorter, has practiced thrift time and energy consumption.

The invention is further arranged in that the host is electrically connected with a mouse, a keyboard and a foot switch, the mouse, the keyboard and the foot switch can start and stop a printing program of the laser marking machine to perform printing operation, the foot switch consists of two inclined pedals, the length directions of the two pedals are mutually vertical, one pedal extends to the side surface of the workbench, and the other pedal extends to the front surface of the workbench.

Through adopting above-mentioned technical scheme, installation mouse, keyboard and foot switch so that operating personnel carry out the printing operation in different positions, and foot switch's design for operating personnel can select different positions to print the operation according to factors such as tableware shape, light condition, health condition, has improved the convenience and the comfort level of printing, thereby has improved operating personnel's execution efficiency.

The invention is further set in such a way that the threaded holes are distributed in a matrix manner, four corners of the upper surface of the cross plate are respectively provided with the threaded holes distributed in the matrix manner, the middle part of the cross plate is rotatably connected with the second platform, the upper surface of the second platform is also provided with more than two grooves, the grooves are internally and slidably connected with limiting blocks, springs are fixed between the limiting blocks and the grooves, and the tops of the limiting blocks are two inclined planes with the middle parts protruding upwards.

By adopting the technical scheme, the threaded holes are formed in the four corners of the cross plate, when tableware under the laser emitter is printed, an operator can place other tableware to be printed on the other threaded hole matrixes of the cross plate, the cross plate can be rotated to print next time after the previous tableware is printed, the printed tableware is replaced at the time, and the rotating design utilizes the time of waiting for printing of the operator to perform feeding and discharging operations, so that the production efficiency is improved; and the design of the limiting blocks limits the cross plate between the two set limiting blocks, so that the position of the cross plate is ensured to be positioned below the laser emitter, and the accuracy of the printed pattern is ensured.

The invention is further provided that in the step (1), the equipment needs 30-35 s for preheating, and the temperature of the upper die and the lower die is increased to 160-180 ℃; the raw materials are dried, crushed and filtered, then weighed and finally heated at the temperature of 135-200 ℃ for 40-65 s.

By adopting the technical scheme, the raw materials are dried, crushed and filtered before being heated, so that moisture, impurities and the like in the raw materials are eliminated, caking, color spots and the like are eliminated, and the uniformity and the attractiveness of finished tableware are ensured.

The invention is further configured that in the step (2), the upper die and the lower die are cleaned by using a soft cleaning brush after each pressing is finished.

By adopting the technical scheme, the upper die and the lower die are cleaned by the soft cleaning brush after the pressing is finished, so that the residual scraps on the upper die and the lower die are eliminated, and the product quality in the next pressing is ensured; the soft cleaning brush can not damage the upper die and the lower die, thereby ensuring that the pressed tableware meets the production requirements.

The laser emitter is further provided with a short rod, a thin rope is wound on the short rod, a steel ball is fixed at the bottom of the thin rope, and scales are arranged on the surface of the support along the height direction of the support.

Through adopting above-mentioned technical scheme, the distance between tableware to the quarter butt can be measured to string and steel ball, and the scale is convenient for operating personnel to read the registration to also can measure the distance on laser emitter and tableware surface when laser rangefinder sensor damages, so that operating personnel carries out calibration operation.

In conclusion, the invention has the following beneficial effects:

1. according to the scheme, the pattern is printed on the tableware by adopting the laser marking machine, and the traditional processes of printing, cutting, coating with gloss powder, drying and secondary pressing of stained paper are omitted in the printing process, so that the forming speed of the trademark is greatly improved, and the production efficiency is improved;

2. the scheme realizes the support of the tableware by utilizing the matching of the threaded holes and the screws, 3 screws can complete the positioning and the support of the tableware of which the contact surface is a plane, 5 screws can complete the positioning and the support of the tableware of which the contact surface is a curved surface, the limitation of the number of the screws saves the time for fixing the tableware to the maximum extent, and the same batch of tableware is only required to be placed among the adjusted screws, so the replacement speed of the tableware is improved, and the production efficiency is further improved;

3. the pattern that the application laser rangefinder sensor and portable projecting apparatus two kinds of differences calibration mode were treated and are printed is adjusted to whether carry out the preliminary printing earlier so that the inspection pattern accords with the production requirement, thereby ensure the yields, and the consuming time of preliminary printing is shorter, has practiced thrift time and energy consumption.

Drawings

FIG. 1 is a schematic view of the overall structure of a laser printer according to an embodiment;

fig. 2 is an exploded view of the storage platform according to an embodiment.

In the figure: 1. a work table; 11. a support; 111. a chute; 112. calibration; 113. a pointer; 114. a strip-shaped groove; 2. a lead screw; 13. a slider; 14. a hand wheel; 2. a host; 21. a foot switch; 3. a display; 4. a laser transmitter; 41. a laser ranging sensor; 42. a short bar; 43. a string; 44. a steel ball; 5. a placement platform; 51. a base; 511. a first sliding sleeve; 512. a first staple; 513. a first fixed block; 52. a first lead screw; 53. a first slide bar; 54. a first platform; 541. a second sliding sleeve; 542. a second staple; 543. a second fixed block; 55. a second lead screw; 56. a second slide bar; 57. a second platform; 571. a rotating shaft; 572. a groove; 573. a spring; 58. a cross plate; 581. a threaded hole; 582. a screw; 59. and a limiting block.

Detailed Description

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

Example (b): a printing type efficient production process of melamine tableware comprises the following steps:

(1) pre-treatment of pressing: starting the device and preheating for 30-35 s, and raising the temperature of the upper die and the lower die to 160-180 ℃; drying, crushing and filtering the raw materials, weighing the raw materials, and heating at 135-200 ℃ for 40-65 s.

(2) Pressing tableware: pouring the raw materials onto a lower die of a compression molding machine, starting compression, attaching an upper die and the lower die to compress and mold the tableware, and cleaning the upper die and the lower die by using a soft cleaning brush after each compression;

(3) and (3) pressing post-treatment: the tableware is polished by an automatic polisher, and then polished by a small polisher, and a cloth grinding wheel is adopted during polishing to avoid damaging the tableware;

(4) marking:

a. inputting a trademark pattern to be printed into a laser marking machine, and then placing tableware to be marked on a placing platform 5 of the laser marking machine;

c. starting a printing process of the laser marking machine after calibration;

As shown in fig. 1, the laser marking machine includes a worktable 1, wherein the upper surface of the worktable 1 is rectangular, and the lower side of the worktable 1 is provided with a supporting column. The worktable 1 is provided with a bracket 11 and a storage platform 5, and the storage platform 5 is used for placing tableware to be processed. Support 11 is vertical to be fixed in the middle part of the long limit of 1 upper surface of workstation, and sliding connection has laser emitter 4 on support 11, and laser emitter 4 is used for printing the operation to the tableware emission laser of treating processing. The bracket 11 is provided with a sliding groove 111 along the length direction thereof, the sliding groove 111 is connected with a sliding block 13 in a sliding manner, and the side wall of the sliding block 13 is attached to the inner wall of the sliding groove 111. One end of the sliding block 13 is fixedly connected with the laser emitter 4, so that the up-down position of the laser emitter 4 is changed. A lead screw 2 is arranged in the middle of the sliding block 13 in a penetrating mode, the bottom of the lead screw 2 is rotatably connected with the bottom of the support 11, the top of the lead screw penetrates through the support 11 and is rotatably connected with the top of the support 11, and a hand wheel 14 is fixed to the top of the lead screw 2 so that an operator can drive the lead screw. A strip-shaped groove 114 is further formed in one side of the support 11, the length direction of the strip-shaped groove 114 is consistent with the length direction of the support 11, and the strip-shaped groove 114 is communicated with the sliding groove 111. A pointer 113 is further fixed on the slider 13, the pointer 113 is slidably connected with the strip-shaped groove 114, and a scale 112 is further provided on the side of the bracket 11 where the strip-shaped groove 114 is formed so that an operator can read the height of the pointer 113. When the hand wheel 14 rotates, the screw rod 2 rotates, and the sliding block 13 is lifted under the limitation and the guidance of the sliding groove 111, so that the laser emitter 4 is driven to lift, and the height of the laser emitter 4 is adjusted.

Host computer 2 has been placed to 1 downside surface of workstation, has placed the display 3 of being connected with host computer 2 electricity on the workstation 1, and display 3 is used for showing the pattern of waiting to print. Laser emitter 4 is connected with host computer 2 electricity, and installs portable projecting apparatus and laser range finding sensor 41 on the laser emitter 4, and portable projecting apparatus is used for treating the pattern projection that prints to the tableware, and laser range finding sensor 41 is used for measuring tableware surface and laser emitter 4's interval, and portable projecting apparatus and laser range finding sensor 41 all are connected with host computer 2 electricity. The host 2 is also electrically connected with a mouse, a keyboard and a foot switch 21, and the mouse, the keyboard and the foot switch can start and stop a printing program of the laser marking machine to perform printing operation. Wherein, foot switch 21 is located 1 downside of workstation, comprises the footboard of two slopes, and the length direction mutually perpendicular of two footboards, and one extends to 1 side of workstation, and another extends to workstation 1 openly for operating personnel can select different positions to print the operation according to factors such as tableware shape, light condition, health condition, has improved the convenience and the comfort level of printing.

In the step (4), the calibration includes the following steps:

J1. comparing the distance measured by the laser ranging sensor 41 with the optimal focal distance range of the laser emitter 4;

J3. when both J1 and J2 meet the printing requirements, the laser emitter 4 is started to perform preprinting, print 2s-5s or 1/3-1/2 of the printed pattern, and check whether the pattern meets the requirements.

As shown in fig. 1, a short rod 42 is fixed on the laser emitter 4, a string 43 is wound on the short rod 42, and a steel ball 44 is fixed at the bottom of the string 43. The string 43 and the steel ball 44 can measure the distance between the tableware and the short rod 42, the scale 112 is convenient for the operator to read the number, the distance between the laser emitter 4 and the surface of the tableware can be deduced by calculating the distance between the short rod 42 and the laser emitter 4, so that the distance between the laser emitter 4 and the surface of the tableware can be measured when the laser ranging sensor 41 is damaged, and the operator can perform calibration operation conveniently.

As shown in fig. 1 and 2, the placement platform 5 includes a base 51, a first platform 54, a second platform 57, and a cross-plate 58. The base 51 is a rectangular plate-shaped structure and is fixed on the upper surface of the workbench 1 and positioned below the laser emitter 4. The first platform 54 has a rectangular plate-like structure and is located above the base 51. The two sides of the upper surface of the base 51 are both fixed with a first sliding sleeve 511, a first sliding rod 53 penetrates through the middle of the first sliding sleeve 511, the two ends of the first sliding rod 53 are fixed with the lower surface of the first platform 54, and the first sliding rod 53 is connected with the first sliding sleeve 511 in a sliding manner. A first fixed block 513 is fixed in the middle of the upper surface of the base 51, a first screw 52 penetrates through the first fixed block 513, the length direction of the first screw 52 is the same as that of the first slide bar 53, and the first screw 52 is in threaded connection with the first fixed block 513. Two ends of the first screw rod 52 are rotatably connected with a fixing plate on the upper surface of the base 51, and one end of the first screw rod 52 is fixed with a handle so that an operator can rotate the handle. The first sliding sleeve 511 is further threadedly connected with a first fixing nail 512 for limiting the sliding of the first sliding rod 53.

The second platform 57 is a rectangular plate-like structure and is located above the first platform 54. The two sides of the upper surface of the first platform 54 are both fixed with a second sliding sleeve 541, the middle of the second sliding sleeve 541 is provided with a second sliding rod 56 in a penetrating way, the two ends of the second sliding rod 56 are fixed with the lower surface of the second platform 57, and the second sliding rod 56 is connected with the second sliding sleeve 541 in a sliding way. The middle part of the upper surface of the first platform 54 is fixed with a second fixed block 543, a second screw rod 55 penetrates through the second fixed block 543, the length direction of the second screw rod 55 is the same as that of the second slide bar 56, and the second screw rod 55 is in threaded connection with the second fixed block 543. Two ends of the second screw 55 are rotatably connected with a fixing plate on the upper surface of the first platform 54, and one end of the second screw 55 is fixed with a handle for the operator to rotate. The side wall of the second sliding sleeve 541 is further threadedly connected with a second fixing nail 542 for limiting the sliding of the second sliding bar 56.

When the first lead screw 52 rotates, the first platform 54 slides relative to the base 51, and the sliding direction is the length direction of the first sliding rod 53. When the second lead screw 55 rotates, the second platform 57 slides relative to the first platform 54 in the length direction of the second slide bar 56. The length direction of the second sliding rod 56 is perpendicular to the sliding direction of the first sliding rod 53, so that the two directions of the placing platform 5 on the horizontal plane can be adjusted, and the horizontal position of the tableware can be changed.

As shown in fig. 2, the cross plate 58 is cross-shaped, the middle part of the cross plate corresponds to the middle part of the second platform 57, a rotating shaft 571 is fixed at the middle part of the second platform 57, and the rotating shaft 571 is rotatably connected with the middle part of the cross plate 58. A plurality of threaded holes 581 are formed in four corners of the cross plate 58, and the plurality of threaded holes 581 are distributed in a matrix manner. Five screws 582 are screwed in the threaded holes 581 of each matrix, and the screws 582 are used for fixing tableware. 3 screws 582 can complete the positioning and supporting of tableware with a plane contact surface, and 5 screws 582 can complete the positioning and supporting of tableware with a curved contact surface.

As shown in fig. 1 and 2, two grooves 572 are formed on the upper surface of the second platform 57, the grooves 572 are located at two sides of the cross groove, and a stop block 59 for limiting the rotation of the cross plate 58 is slidably connected in the grooves 572. The top of the limiting block 59 is provided with two slopes protruding upwards from the middle, and a spring 573 is fixed between the limiting block 59 and the groove 572. When the cross plate 58 rotates, the bottom edge of the cross plate 58 contacts the stopper 59, the stopper 59 is pressed into the groove 572, the spring 573 compresses, when the other corner of the cross plate 58 rotates to the lower side of the laser emitter 4, the elastic force of the spring 573 pushes up the stopper 59, and the two stoppers 59 limit the cross plate 58, so that tableware on the cross plate 58 is stabilized.

The invention adopts the laser marking machine to print the patterns on the tableware, the printing process is between 1s and 30s according to the difference of the complexity of the patterns, the traditional processes of printing, cutting, coating powder, drying and secondary pressing of stained paper are omitted, the forming speed of the trademark is greatly improved, and the production efficiency is improved.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. A printing type efficient production process of melamine tableware is characterized by comprising the following steps:

(3) and (3) pressing post-treatment: grinding and polishing the product;

(4) marking:

a. inputting a trademark pattern to be printed into a laser marking machine, and then placing tableware to be marked on a storage platform (5) of the laser marking machine;

c. starting a printing process of the laser marking machine after calibration;

d. changing the tableware and repeating the steps a-c until all tableware is marked;

in the step (4), the laser marking machine comprises a workbench (1), a bracket (11) and the object placing platform (5) are fixed on the workbench (1), the bracket (11) is connected with a laser emitter (4) in a sliding way, the object placing platform (5) comprises a base (51) fixed with the workbench (1), the base (51) is connected with a first platform (54) in a sliding way, the first platform (54) is connected with a second platform (57) in a sliding way, the sliding directions of the first platform (54) and the second platform (57) are mutually vertical, a cross plate (58) for placing tableware is arranged on the second platform (57), a plurality of threaded holes (581) are formed in the cross plate (58), screws (582) used for supporting tableware are matched with the threaded holes (581), and each tableware is limited by 3-5 screws (582); the threaded holes (581) are distributed in a matrix manner, and the four corners of the upper surface of the cross plate (58) are provided with the threaded holes (581) distributed in a matrix manner; the middle part of the cross plate (58) is rotationally connected with the second platform (57), the upper surface of the second platform (57) is also provided with two grooves (572), and the two grooves (572) are respectively positioned at two sides of the cross groove; a limiting block (59) is connected in the groove (572) in a sliding mode, a spring (573) is fixed between the limiting block (59) and the groove (572), and the top of the limiting block (59) is provided with two inclined planes with the middle protruding upwards; when the other angle of the cross plate (58) rotates to the lower side of the laser emitter (4), the cross plate (58) is limited by the two limiting blocks (59); a sliding groove (111) is formed in the support (11) along the length direction of the support, a sliding block (13) is connected in the sliding groove (111) in a sliding mode, the side wall of the sliding block (13) is attached to the inner wall of the sliding groove (111), and one end of the sliding block (13) is fixedly connected with the laser emitter (4); a lead screw (2) penetrates through the middle of the sliding block (13), the bottom of the lead screw (2) is rotatably connected with the bottom of the support (11), the top of the lead screw penetrates through the support (11) and is rotatably connected with the top of the support (11), and a hand wheel (14) is fixed on the top of the lead screw (2); a strip-shaped groove (114) is further formed in one side of the support (11), the length direction of the strip-shaped groove (114) is consistent with that of the support (11), and the strip-shaped groove (114) is communicated with the sliding groove (111); a pointer (113) is further fixed on the sliding block (13), the pointer (113) is in sliding connection with the strip-shaped groove (114), and scales (112) are further arranged on the side face, provided with the strip-shaped groove (114), of the support (11); a short rod (42) is fixed on the laser emitter (4), a thin rope (43) is wound on the short rod (42), a steel ball (44) is fixed at the bottom of the thin rope (43), and scales (112) are arranged on the surface of the support (11) along the height direction of the support.

2. The printing type efficient melamine tableware production process according to claim 1, wherein a host (2) electrically connected with the laser emitter (4) is placed on the lower side of the workbench (1), a display (3) electrically connected with the host (2) is placed on the workbench (1), a portable projector for projecting a pattern to be printed on tableware is mounted on the laser emitter (4), and the portable projector is electrically connected with the host (2).

3. The printing type efficient melamine tableware production process according to claim 2, wherein the laser emitter (4) is provided with a laser ranging sensor (41) for measuring the distance between the surface of the tableware and the laser emitter (4), and the laser ranging sensor (41) is electrically connected with the host machine (2) and the display (3).

4. The printing type efficient melamine tableware production process according to claim 3, wherein the calibration in the step (4) comprises the following steps:

J1. comparing the distance measured by the laser ranging sensor (41) with the optimal focal distance range of the laser transmitter (4);

J3. when both J1 and J2 meet the printing requirements, the laser emitter (4) is started to perform preprinting, print 2s-5s or 1/3-1/2 of the printed pattern, and check whether the pattern meets the requirements.

5. The printing type efficient production process of melamine tableware according to claim 2, wherein the main machine (2) is electrically connected with a mouse, a keyboard and a foot switch (21), the mouse, the keyboard and the foot switch can start and stop a printing program of the laser marking machine to perform printing operation, the foot switch (21) consists of two inclined pedals, the length directions of the two pedals are perpendicular to each other, one pedal extends to the side surface of the workbench (1), and the other pedal extends to the front surface of the workbench (1).

6. The printing type efficient melamine tableware production process according to claim 1, wherein in the step (1), the preheating of the equipment is 30-35 s, and the temperature of the upper die and the lower die is raised to 160-180 ℃; the raw materials are dried, crushed and filtered, then weighed and finally heated at the temperature of 135-200 ℃ for 40-65 s.

7. The process for producing printed melamine tableware according to claim 1, wherein in said step (2), said upper and lower molds are cleaned with a soft cleaning brush after each pressing.