阅读说明：本技术 一种双激光打印用激光器热量回收再利用方法 (Heat recycling method of laser for double-laser printing ) 是由 吕忠利 王崇 矫滢 温武汉 于 2021-07-07 设计创作，主要内容包括：本发明公开了激光打印技术领域的一种双激光打印用激光器热量回收再利用方法,该方法的具体实施步骤：先将保温箱进行加热,使得保温箱温度恒定；启动打印设备进行激光打印,逐层喷洒打印截止；启动循环装置将打印高温打印介质进行回收再打印,解决了现有打印机在使用时需要将设备内部进行加热,使得设备处于恒定温度下进行高效打印,但是在激光打印过程中辐射到未被打印的粉末上热量,在最终取出零部件时被一次性回收进行再次打印,从而造成了激光打印器的热量损失。(The invention discloses a heat recycling method of a laser for double-laser printing in the technical field of laser printing, which comprises the following specific implementation steps: firstly, heating the heat preservation box to ensure that the temperature of the heat preservation box is constant; starting a printing device to perform laser printing, and stopping spraying and printing layer by layer; start circulating device and will print high temperature print medium and retrieve and print again, solved current printer and need heat equipment inside when using for equipment is in and carries out high efficiency printing under the constant temperature, but radiates the heat on the powder that is not printed at laser printing in-process, is once only retrieved and prints once more when finally taking out spare part, thereby has caused laser printer's calorific loss.)

1. A heat recycling method of a laser for double-laser printing is characterized by comprising the following steps: the method comprises the following specific implementation steps:

the method comprises the following steps: firstly, heating the heat preservation box to ensure that the temperature of the heat preservation box is constant;

step two: starting a printing device to perform laser printing, and stopping spraying and printing layer by layer;

step three: starting a circulating device to recycle and print the high-temperature printing medium,

the circulating device in the third step comprises two lifting motors 9, a recovery motor 10, a laser head 11, an incubator 12, two printing tables 13, two shielding ring plates 14, a mounting plate 15 and a sprayer 16, wherein the mounting plate 15 is fixedly arranged on the lower end face of the incubator 12, the two shielding ring plates 14 are symmetrically and fixedly arranged on the lower end face of the incubator 12 and communicated with the incubator 12, the printing tables 13 are vertically slidably arranged on the inner wall of the shielding ring plates 14, a thread sleeve 17 is fixedly arranged at the lower end of each printing table 13, a screw 18 is screwed in the thread sleeve 17, the screw 18 is coaxially and fixedly arranged on an output shaft of the lifting motor 9, the lifting motors 9 are fixedly arranged on the side walls of the mounting plate 15, a turnover shaft 19 is rotatably arranged on the lower side wall of the rear end of the shielding ring plates 14, a turnover plate 20 is fixedly arranged on the outer wall of the turnover shaft 19, and a circulating hole 21 is formed in the center of the turnover plate 20, the rear side wall of the turning plate 20 is fixedly provided with a circulating fan 22 corresponding to the circulating hole 21 through a bracket, the rear side wall of the shielding ring plate 14 at the rear end of the turning plate 20 is fixedly provided with a sealing arc plate 23 tightly attached to the rotating path of the turning plate 20, the lower end of the sealing arc plate 23 is fixedly provided with a collecting hopper 24, the upper end of the collecting hopper 24 is tightly attached to the lower end of the turning plate 20, the center of the lower end of the collecting hopper 24 is rotatably provided with a circulating shaft 25 engaged with the rotating shaft of the circulating fan 22, the lower end of the circulating shaft 25 is rotatably arranged on the rear side wall of the mounting plate 15 through the bracket, the side wall at the lower end of the collecting hopper 24 is communicated with a steel pipe 26, the other end of the steel pipe 26 passes through the insulation box 12 and is fixedly connected with the insulation box 12, the steel pipe 26 passes through one end of the insulation box 12 and is fixedly connected with a connecting hose 27, the connecting hose 27 is communicated with the sprinkler 16 input end, and the inner side wall of the insulation box 12 is rotatably provided with four symmetrical sprinkling wheels 28, the outer side of the spraying wheel 28 is sleeved with a spraying belt 29, the sprayer 16 is fixedly arranged on the inner wall of the lower end of the spraying belt 29, two spraying wheels 28 at the rear end are coaxially and fixedly provided with the same step rod 291, the recovery motor 10 is fixedly arranged on the upper end surface of the mounting plate 15, the output shaft of the motor 10 penetrates through the driving gear 30 which is coaxially and fixedly arranged at the lower end of the mounting plate 15, the outer end of the driving gear 30 is meshed with a switching gear 31, the switching gear 31 is coaxially and fixedly connected with a shear shaft 32, the lower end of the mounting plate 15 is provided with a shear circular hole 33 which takes the motor output shaft as an axis, the shear shaft 32 is sleeved on the inner side of the shear circular hole 33, the switching gear 31 is respectively meshed with a cleaning gear 34 and a spraying gear 35 at the limit positions at the two ends of the shear circular hole 33, the shear shaft 32 penetrates through the outer wall of the upper end of the mounting plate 15 and is fixedly provided with an overturning rack 36, the meshing of the 36 outside of upset rack has upset action wheel 37, upset action wheel 37 rotates the mounting panel 15 up end that sets up on the perpendicular line of shear circular arc hole 33 pitch arc, clearance gear 34 outer end pivot is connected on two circulation axles 25 through the conveyer belt transmission, upset action wheel 37 is connected with vertical band pulley 38 through the transmission of cross belt 40, vertical band pulley 38 sets up at mounting panel 15 upper end central authorities through the support rotation, the pivot outer wall cover at vertical band pulley 38 both sides is equipped with upset hold-in range 39, two the one end outer wall that the trip shaft 19 passed the retaining ring board 14 lateral wall is established respectively to upset hold-in range 39 inboard, it connects the one end outer wall that step bar 291 passed the insulation can 12 lateral wall at the bevel gear group 40 transmission that has the torsional spring to spray gear 35.

2. The heat recycling method of the laser for dual laser printing according to claim 1, wherein: every the equal vertical fixed two slides 45 that are provided with of retaining ring board 14 lower extreme lateral wall, vertical band pulley 38 rotates and installs two slides 45 lateral walls at the middle most, slide 45 and retaining ring board 14 inner wall are seted up two one on the other thin wide part of going up and down and are overlapped perpendicular oblique slide 46, are close to the board 20 lateral wall of turning over the seal plate 47 that has magnetic force is inhaled to printing table 13 lower extreme magnetism, seal plate 47 both sides wall is fixed and is provided with two one on the other thin slide bar 48 of going up thick down, slide bar 48 slides and sets up at perpendicular oblique slide 46 inner wall.

3. The heat recycling method of the laser for dual laser printing according to claim 2, wherein: the front end of the heat preservation box 12 is rotatably provided with a glass door.

4. The heat recycling method of the laser for dual laser printing according to claim 3, wherein: the slide bar 48 is made of antifriction material.

5. The heat recycling method of the laser for dual laser printing according to claim 4, wherein: the recovery motor 10 is a high-speed motor.

6. The heat recycling method of the laser for dual laser printing according to claim 5, wherein: the step lever 291 is fixedly provided at the side wall of the spray wheel 28 at the rear end.

Technical Field

The invention relates to the technical field of laser printing, in particular to a heat recycling method for a laser for double-laser printing.

Background

The laser 3D printing technology is one of emerging technologies, and is high-precision metal part laser 3D printing equipment which is advanced in efficiency and largest in printed part size in the world at present; on the basis of the layered entity forming technology, the assumption is that a thin layer material is in a powder shape, the powder is added by a nozzle (or other means) on the layer surface needing to be increased, a laser heat source is used for melting the powder, the powder is melted and cooled to obtain a stacked cladding thin layer, and a plurality of thin layers are stacked to form a three-dimensional entity, which is the basic idea of 3D printing; in the printing process of the existing equipment, a layered printing mode is adopted, a layer of printing powder is sprayed, and the height of the powder is basically the same as that of the part after printing.

The inside of the existing printer needs to be heated when the existing printer is used, so that the equipment is at a constant temperature for efficient printing, but the heat is radiated to the powder which is not printed in the laser printing process, and the powder is recycled once for printing again when parts are finally taken out, so that the heat loss of the laser printer is caused.

Based on the above, the invention designs a method for recycling heat of the laser for double-laser printing to solve the above problems.

Disclosure of Invention

The invention aims to provide a heat recycling method for a laser for double-laser printing, which aims to solve the problem that the heat loss of a laser printer is caused because the heat radiated to unprinted powder is recycled once for reprinting when parts are finally taken out, although the heat radiated to the unprinted powder is required to be heated in the device when the existing printer is used, so that the device is efficiently printed at a constant temperature in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a heat recycling method of a laser for double-laser printing comprises the following specific implementation steps:

the method comprises the following steps: firstly, heating the heat preservation box to ensure that the temperature of the heat preservation box is constant;

step two: starting a printing device to perform laser printing, and stopping spraying and printing layer by layer;

step three: starting a circulating device to recycle and print the high-temperature printing medium,

the circulating device in the third step comprises two lifting motors, a recovery motor, a laser head, an insulation can, two printing tables, two shielding ring plates, a mounting plate and a sprayer, wherein the mounting plate is fixedly arranged on the lower end face of the insulation can, the two shielding ring plates are symmetrically and fixedly arranged on the lower end face of the insulation can and communicated with the insulation can, the inner walls of the shielding ring plates are vertically and slidably arranged on the printing tables, the lower end of each printing table is fixedly provided with a threaded sleeve, the threaded sleeve is internally screwed by a screw rod, the screw rod is coaxially and fixedly arranged on an output shaft of the lifting motor, the lifting motors are fixedly arranged on the side walls of the mounting plate, the side walls at the rear ends of the shielding ring plates are rotatably provided with turnover shafts, the outer walls of the turnover shafts are fixedly provided with turnover plates, the centers of the turnover plates are provided with circulating holes, and the rear side walls of the turnover plates are fixedly provided with circulating fans corresponding to the circulating holes through supports, the rear side wall of the shielding ring plate at the rear end of the turning plate is fixedly provided with a sealing arc plate tightly attached to a turning plate rotating path, the lower end of the sealing arc plate is fixedly provided with a collecting hopper, the upper end of the collecting hopper is tightly attached to the lower end of the turning plate, the center of the lower end of the collecting hopper is rotatably provided with a circulating shaft meshed with a circulating fan rotating shaft, the lower end of the circulating shaft is rotatably arranged on the side wall at the rear end of the mounting plate through a support, the side wall at the lower end of the collecting hopper is communicated with a steel pipe, the other end of the steel pipe penetrates through the heat insulation box and is fixedly connected with the heat insulation box, one end of the steel pipe penetrating through the heat insulation box is fixedly connected with a connecting hose, the connecting hose is communicated with the input end of a sprinkler, the inner side wall of the heat insulation box is rotatably provided with four symmetrical spray wheels, the outer sides of the spray wheels are sleeved with a spray belt, the sprinkler is fixedly arranged on the inner wall at the lower end of the spray belt, and two spray wheels at the rear end are coaxially and fixedly provided with the same step rod, the recovery motor is fixedly arranged on the upper end face of the mounting plate, the lower end of the motor output shaft, which penetrates through the mounting plate, is coaxially and fixedly provided with a driving gear, the outer end of the driving gear is meshed with a switching gear, the switching gear is coaxially and fixedly connected with a shear shaft, the lower end of the mounting plate is provided with a shear circular arc hole which takes the motor output shaft as an axis, the shear shaft is sleeved on the inner side of the shear circular arc hole, the switching gear is respectively meshed with a cleaning gear and a spraying gear at the extreme positions of the two ends of the shear circular arc hole, the shear shaft penetrates through the mounting plate to be fixedly provided with an overturning rack on the outer wall of the upper end, the outer side of the overturning rack is meshed with an overturning driving wheel, the overturning driving wheel rotates on the upper end face of the mounting plate arranged on the vertical line of an arc line in the shear circular arc hole, the rotating shaft at the outer end of the cleaning gear is connected on the two circulating shafts through a conveyor belt, and the overturning driving wheel is connected with a vertical belt pulley through a crossed belt transmission, the vertical belt wheel is arranged in the center of the upper end of the mounting plate through the rotation of the support, turning synchronous belts are sleeved on the outer walls of rotating shafts on two sides of the vertical belt wheel, the inner sides of the two turning synchronous belts are respectively sleeved on the outer wall of one end, penetrating through the side wall of the retaining ring plate, of the turning shaft, and the spraying gear is in transmission connection with the outer wall of one end, penetrating through the side wall of the insulation box, of the stepping rod through a bevel gear set with a torsional spring;

firstly, the device is assembled and electrified, a heater is used for heating the heat preservation box to enable the temperature inside the heat preservation box to reach the proper temperature, printing powder is added into a collecting hopper (as shown in figure 2, the upper side in the figure is the upper end surface of the equipment, the figure is the front end of the equipment, the orientation of the equipment is adopted for description later), then a recovery motor is started to enable the recovery motor to rotate clockwise (seen from the upper end of the equipment), the motor rotates to drive a driving gear to rotate clockwise, the driving gear drives a switching gear to rotate anticlockwise, the switching gear rotates and simultaneously receives the rotating torque of the driving gear to drive a shear shaft to move to the right end of the equipment along a shear circular arc hole, the movement of the shear shaft drives an overturning rack at the upper end to drive an overturning driving wheel to rotate, the overturning driving wheel rotates to drive a cross belt to rotate so as to enable a vertical belt wheel to rotate, the vertical belt wheel rotates to drive an overturning synchronous belt to rotate, thereby driving the upper end of the turnover shaft to rotate anticlockwise (as shown in fig. 6 and 4, wherein the cross mode of the cross belt can directly change the rotation direction of the vertical belt wheel, thereby easily realizing the anticlockwise rotation of the turnover shaft, when viewed from the right side of the equipment, the recovery motor continuously rotates, so that the shear shaft continuously moves towards the other end of the shear circular arc hole, the turnover shaft rotates to turn over the turnover plate to the rear end of the printing table and be attached to the printing table, meanwhile, the turnover shaft rotates to drive the circulating fan on the side wall of the turnover shaft to be separated from the meshing with the circulating shaft, so that the power of the circulating fan is interrupted and does not rotate, when the shear shaft moves to the other end of the shear circular arc hole, the switching gear at the lower end is meshed with the spraying gear, so as to drive the spraying gear to rotate, the spraying gear drives the bevel gear set to rotate, so that the stepping rod rotates to drive the spraying wheel to rotate, the spraying wheel rotates to drive the spraying belt to rotate, the spraying belt rotates to move the sprayer forwards, meanwhile, the sprayer extracts printing powder from the collecting hopper through the connecting hose and the steel pipe, and then the printing powder is brushed off from the printing table and sprayed to the upper end of the printing table; at the moment, the laser head prints, so that one layer of powder of the printing table is printed into a required product layer, after the printing is finished, the recovery motor rotates clockwise (at the moment, the torsion spring in the bevel gear set rebounds to reset the sprayer), so that the turnover shaft drives the turnover plate to rotate clockwise (as shown in figures 3 and 4, the sealing arc plate can cling to the edge of the upper end of the turnover plate when the turnover plate rotates, so that air flowing caused by rotation of the turnover plate is avoided, the powder which is not printed on the printing table is blown everywhere), meanwhile, the driving shaft of the circulating fan is meshed with the circulating shaft at the lower end, along with the continuous rotation of the recovery motor, the turnover plate is turned to the limit position, the driving shaft of the circulating fan is meshed with the circulating shaft at the lower end, meanwhile, the switching gear is meshed with the cleaning gear, the motor continues to rotate, and the turnover rack cannot drive the turnover rack to continue to rotate as the shear shaft moves to the limit position of the shear arc hole, at the moment, the motor rotates to drive the cleaning gear to rotate, the cleaning gear rotates to drive the circulating shaft to rotate through the belt on the outer side, so that the circulating fan at the upper end rotates, high-temperature powder which is not printed on the printing table is recovered into the collecting hopper, the recovery of the printing powder with heat is completed, the continuous printing can be completed by repeating the operation, meanwhile, the feeding and lifting motor drives the screw rod to rotate in the threaded sleeve every time, the printing table is gradually lowered, and the laser head is always in an efficient printing distance;

according to the invention, the shear shaft is driven by the recovery motor to slide back and forth in the shear circular arc hole, so that the turning plate with the circulating fan in the equipment is rotated, the circulating fan is rotated to recover the high-temperature printing powder subjected to printing radiation, the collected high-temperature powder is conveyed to the sprayer again through the steel pipe and the connecting hose on the side wall of the collecting hopper, and the sprayer is driven by the bevel gear set to move to spray the high-temperature printing powder, so that the recovery and the reuse of the printing powder which is not printed in the laser printing and is irradiated by heat are completed, the temperature transfer circulation in the equipment is completed, and the phenomenon that the heat waste of the laser printing is caused because the heat insulation box needs an external heater to heat and insulate for many times is avoided.

As a further proposal of the invention, two sliding plates are vertically and fixedly arranged on the side wall of the lower end of each baffle ring plate, the vertical belt wheel is rotatably arranged on the side walls of the two sliding plates at the middle, the inner walls of the sliding plates and the baffle ring plate are provided with two vertical inclined slideways with the wide parts overlapped, the wide parts are thin from top to bottom and thin from top to bottom, a sealing plate with magnetic force is magnetically attracted at the lower end of the printing table close to the side wall of the turning plate, two sliding rods which are arranged one above the other and are thin at the top and thick at the bottom are fixedly arranged on the two side walls of the sealing plate, the sliding rods are arranged on the inner wall of the vertical inclined slideway in a sliding manner, when the printing table is lowered to the lowest extreme printing position for discharging, the slide bars on the side wall of the slide plate can slide to the side wall of the printing table along the vertical inclined slide ways (as shown in fig. 8, 9 and 10, the vertical inclined slide ways with the upper part, the lower part, the thin part and the lower part overlapped with the wide part and the upper part, the thin part and the lower part, and the thick part and the upper part are overlapped with each other, so that the limit tracks of the thin rods and the thick rods are not influenced by each other);

the decline of print table makes the slide bar of slide lateral wall descend along perpendicular oblique slide to make print table and turn over the board lower extreme and remain sealed throughout, thereby avoided high temperature to print the radiation powder and caused the indiscriminate phenomenon appearance that flies of dust when retrieving.

As a further scheme of the invention, the front end of the heat insulation box is rotatably provided with a glass door, so that an operator can observe the interior of the equipment conveniently.

As a further scheme of the invention, the sliding rod is made of antifriction materials, so that friction is reduced, and the service life of equipment is prolonged.

As a further scheme of the invention, the recovery motor adopts a high-speed motor, so that the wind power of the circulating fan is expanded, the recovery efficiency is improved, and simultaneously, hot air in the equipment flows.

As a further scheme of the invention, the stepping rod is fixedly arranged on the side wall of the spraying wheel at the rear end, so that a glass door at the front end of the heat insulation box is not shielded, and an operator is prevented from observing the working condition of the equipment at any time.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the shear shaft is driven by the recovery motor to slide back and forth in the shear circular arc hole, so that the turning plate with the circulating fan in the equipment is rotated, the circulating fan is rotated to recover the high-temperature printing powder subjected to printing radiation, the collected high-temperature powder is conveyed to the sprayer again through the steel pipe and the connecting hose on the side wall of the collecting hopper, and the sprayer is driven by the bevel gear set to move to spray the high-temperature printing powder, so that the recovery and the reuse of the printing powder which is not printed in the laser printing and is irradiated by heat are completed, the temperature transfer circulation in the equipment is completed, and the phenomenon that the heat waste of the laser printing is caused because the heat insulation box needs an external heater to heat and insulate for many times is avoided.

2. The slide bar of slide lateral wall descends along perpendicular oblique slide through the decline of print table to make print table and turning over the board lower extreme and remain sealed throughout, thereby avoided high temperature to print the phenomenon appearance that radiation powder caused the dust to fly in disorder when retrieving.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the process flow structure of the present invention;

FIG. 2 is a schematic diagram of the overall structure of the present invention;

FIG. 3 is a schematic view of the right side in partial cross-section of the present invention;

FIG. 4 is an enlarged view of the structure at A in FIG. 3 according to the present invention;

FIG. 5 is a front end side view of the overall structure of the present invention;

FIG. 6 is an enlarged view of the structure at B in FIG. 5 according to the present invention;

FIG. 7 is a schematic view of the fitting structure of the transmission component of the mounting plate according to the present invention;

FIG. 8 is a schematic side elevation view in partial cross-sectional configuration in accordance with the present invention;

FIG. 9 is an enlarged view of the structure of FIG. 8 at C according to the present invention;

FIG. 10 is an enlarged view of the structure shown in FIG. 8 at D according to the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

the device comprises a lifting motor 9, a recovery motor 10, a laser head 11, an insulation box 12, a printing table 13, a shielding ring plate 14, a mounting plate 15, a sprayer 16, a threaded sleeve 17, a screw 18, a turnover shaft 19, a turnover plate 20, a circulation hole 21, a circulation fan 22, a sealing arc plate 23, a collection hopper 24, a circulation shaft 25, a steel pipe 26, a connecting hose 27, a spraying wheel 28, a spraying belt 29, a stepping rod 291, a driving gear 30, a switching gear 31, a shearing shaft 32, a shearing arc hole 33, a cleaning gear 34, a spraying gear 35, a turnover rack 36, a turnover driving wheel 37, a vertical belt wheel 38, a turnover synchronous belt 39, a cross belt 40, a bevel gear group 41, a sliding plate 45, a vertical inclined slideway 46, a sealing plate 47 and a sliding rod 48.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-10, the present invention provides a technical solution: a heat recycling method of a laser for double-laser printing comprises the following specific implementation steps:

the method comprises the following steps: firstly, heating the heat preservation box to ensure that the temperature of the heat preservation box is constant;

step two: starting a printing device to perform laser printing, and stopping spraying and printing layer by layer;

step three: starting a circulating device to recycle and print the high-temperature printing medium,

the circulating device in the third step comprises two lifting motors 9, a recovery motor 10, a laser head 11, an incubator 12, two printing tables 13, two shielding ring plates 14, a mounting plate 15 and a sprayer 16, wherein the mounting plate 15 is fixedly arranged on the lower end face of the incubator 12, the two shielding ring plates 14 are symmetrically and fixedly arranged on the lower end face of the incubator 12 and communicated with the incubator 12, the printing tables 13 are vertically and slidably arranged on the inner walls of the shielding ring plates 14, a threaded sleeve 17 is fixedly arranged at the lower end of each printing table 13, a screw 18 is screwed in the threaded sleeve 17, the screw 18 is coaxially and fixedly arranged on an output shaft of the lifting motor 9, the lifting motor 9 is fixedly arranged on the side wall of the mounting plate 15, a turning shaft 19 is rotatably arranged on the lower side wall at the rear end of each shielding ring plate 14, a turning plate 20 is fixedly arranged on the outer wall of the turning shaft 19, a circulating hole 21 is formed in the center of the turning plate 20, and a circulating fan 22 corresponding to the circulating hole 21 is fixedly arranged on the rear side wall of the turning plate 20 through a support, a sealing arc plate 23 tightly attached to the rotation path of the turning plate 20 is fixedly arranged on the rear side wall of a shielding ring plate 14 at the rear end of the turning plate 20, a collecting hopper 24 is fixedly arranged at the lower end of the sealing arc plate 23, the upper end of the collecting hopper 24 is tightly attached to the lower end of the turning plate 20, a circulating shaft 25 meshed with the rotating shaft of a circulating fan 22 is rotatably arranged in the center of the lower end of the collecting hopper 24, the lower end of the circulating shaft 25 is rotatably arranged on the rear side wall of a mounting plate 15 through a bracket, a steel pipe 26 is communicated with the side wall at the lower end of the collecting hopper 24, the other end of the steel pipe 26 penetrates through an insulation box 12 and is fixedly connected with the insulation box 12, a connecting hose 27 is fixedly connected with one end of the steel pipe 26 penetrating through the insulation box 12 and is communicated with an input end of a sprinkler 16, four symmetrical sprinkling wheels 28 are rotatably arranged on the inner side wall of the insulation box 12, a sprinkling belt 29 is sleeved on the outer side of the sprinkling wheel 28, the sprinkler 16 is fixedly arranged on the inner wall at the lower end of the sprinkling belt 29, a same step rod 291 is coaxially and fixedly arranged on the two sprinkling wheels 28 at the rear end, the recycling motor 10 is fixedly arranged on the upper end surface of the mounting plate 15, the lower end of the output shaft of the motor 10 penetrating through the mounting plate 15 is coaxially and fixedly provided with a driving gear 30, the outer end of the driving gear 30 is meshed with a switching gear 31, the switching gear 31 is coaxially and fixedly connected with a shear shaft 32, the lower end of the mounting plate 15 is provided with a shear circular hole 33 with the output shaft of the motor as an axis, the shear shaft 32 is sleeved on the inner side of the shear circular hole 33, the switching gear 31 is respectively meshed with a cleaning gear 34 and a spraying gear 35 at the limit positions of two ends of the shear circular hole 33, the shear shaft 32 penetrates through the mounting plate 15 and is fixedly provided with a turnover rack 36 on the outer wall of the upper end, the outer side of the turnover rack 36 is meshed with a turnover driving wheel 37, the turnover driving wheel 37 rotates to be arranged on the upper end surface of the mounting plate 15 on the vertical line of the arc line in the shear circular hole 33, the rotating shaft of the outer end of the cleaning gear 34 is connected on the two circulating shafts 25 through a conveyor belt in a transmission way, the overturning driving wheel 37 is in transmission connection with a vertical belt wheel 38 through a cross belt 40, the vertical belt wheel 38 is arranged in the center of the upper end of the mounting plate 15 through a support in a rotating mode, overturning synchronous belts 39 are sleeved on the outer walls of rotating shafts on two sides of the vertical belt wheel 38, the inner sides of the two overturning synchronous belts 39 are respectively sleeved on the outer wall of one end, penetrating through the side wall of the retainer ring plate 14, of the overturning shaft 19, and the spraying gear 35 is in transmission connection with the outer wall of one end, penetrating through the side wall of the heat preservation box 12, of the stepping rod 291 through a bevel gear set 40 with a torsion spring;

firstly, the device is assembled and electrified, a heater is used for heating the heat preservation box 12 to enable the temperature inside the heat preservation box 12 to reach the proper temperature, printing powder is added into a collection hopper 24 (as shown in figure 2, the upper side in the figure is the upper end surface of the device, the figure is the front end of the device, and the direction of the device is adopted for description), at this time, a recovery motor 10 is started, the recovery motor 10 rotates clockwise (seen from the upper end of the device), the motor 10 rotates to drive a driving gear 30 to rotate clockwise, the driving gear 30 drives a switching gear 31 to rotate anticlockwise, the switching gear 31 rotates and simultaneously receives the rotating torque of the driving gear 30 to drive a shear shaft 32 to move towards the right end of the device along a shear arc hole 33, the upper end of the movement drive of the shear shaft 32 drives an overturning rack 36 to drive an overturning driving wheel 37 to rotate, the overturning driving wheel 37 rotates to drive a cross belt 40 to rotate so as to drive a vertical belt wheel 38 to rotate, the vertical belt wheel 38 rotates to drive the turnover synchronous belt 39 to rotate, so as to drive the turnover shaft 19 at the upper end to rotate anticlockwise (as shown in fig. 6 and 4, the crossing mode of the crossed belt 40 can directly change the rotation direction of the vertical belt wheel 38, the anticlockwise rotation of the turnover shaft 19 is easily realized, and the left side of the device is seen from the right side of the device), as the recovery motor 10 continues to rotate, the shear shaft 32 continues to move towards the other end of the shear circular arc hole 33, so that the turnover shaft 19 rotates to turn the turnover plate 20 to the rear end of the printing table 13 and to be attached to the printing table 13, meanwhile, the turnover shaft 19 drives the circulating fan 22 at the side wall to be disengaged from the circulating shaft 25 when rotating, so that the power of the circulating fan 22 is interrupted and does not rotate, when the shear shaft 32 moves to the other end of the shear circular arc hole 33, the switching gear 31 at the lower end is engaged with the spraying gear 35, so as to drive the spraying gear 35 to rotate, the spraying gear 35 drives the bevel gear group 41 to rotate, so that the stepping rod 291 rotates, the stepping rod 291 rotates to drive the spraying wheel 28 to rotate, the spraying wheel 28 rotates to drive the spraying belt 29 to rotate, the spraying belt 29 rotates to move the sprayer 16 forwards, and meanwhile, the sprayer 16 extracts printing powder from the collecting hopper 24 through the connecting hose 27 and the steel pipe 26 and brushes the printing powder from the printing table 13 to spray the printing powder to the upper end of the printing table 13; at this time, the laser head 11 prints, so that a part of the powder of the printing table 13 is printed into a layer of a required product, after the printing is finished, the recovery motor 10 rotates clockwise (at this time, the torsion spring in the bevel gear set 41 rebounds to reset the sprayer 16), so that the turnover shaft 19 drives the turnover plate 20 to rotate clockwise (as shown in fig. 3 and 4, the sealing arc plate 23 can cling to the upper end edge of the turnover plate 20 when the turnover plate 20 rotates, so that air flowing caused by the rotation of the turnover plate 20 is avoided, so that the powder which is not printed on the printing table 13 is blown everywhere), meanwhile, the driving shaft of the circulation fan 22 is meshed with the circulation shaft 25 at the lower end, along with the continuous rotation of the recovery motor 10, the turnover plate 20 turns to the limit position, the driving shaft of the circulation fan 22 is meshed with the circulation shaft 25 at the lower end, and the switching gear 31 is meshed with the cleaning gear 34, so that the motor continues to rotate, because the shear shaft 32 moves to the extreme position of the shear arc hole 33, the turnover rack 36 cannot drive the turnover driving wheel 37 to continue rotating, at the moment, the motor rotates to drive the cleaning gear 34 to rotate, the cleaning gear 34 rotates to drive the circulating shaft 25 to rotate through the belt on the outer side, so that the circulating fan 22 at the upper end rotates, high-temperature powder which is not printed on the printing table 13 is recovered into the collecting hopper 24, the recovery of the printing powder with heat is completed, the continuous printing can be completed by repeating the operation, meanwhile, the feeding and lifting motor 9 drives the screw rod 18 to rotate in the threaded sleeve 17 every time, so that the printing table 13 is gradually lowered, and the laser head 11 is always in an efficient printing distance;

according to the invention, the shear shaft 32 is driven by the recovery motor 10 to slide back and forth in the shear circular hole 33, so that the turning plate 20 with the circulating fan 22 in the equipment rotates, the circulating fan 22 rotates to recover the high-temperature printing powder of printing radiation, the collected high-temperature powder is conveyed to the sprayer 16 again through the steel pipe 26 and the connecting hose 27 on the side wall of the collecting hopper 24, the sprayer 16 is driven by the bevel gear set 41 to move to spray the high-temperature printing powder, the printing powder which is not printed and is radiated by heat is recovered and reused in laser printing, and the temperature transfer circulation in the equipment is completed, so that the phenomenon that the insulation box 12 needs an external heater to heat and preserve heat for many times, and the waste of laser printing heat is caused is avoided.

As a further scheme of the present invention, two sliding plates 45 are vertically and fixedly disposed on the side wall of the lower end of each ring guard 14, a vertical belt pulley 38 is rotatably mounted on the side walls of the two middle sliding plates 45, two vertical inclined slideways 46 with upper, lower, thin and wide portions overlapping up and down are disposed on the inner walls of the sliding plates 45 and the ring guard 14, a sealing plate 47 with magnetic force is magnetically attracted to the lower end of the printing table 13 close to the side wall of the turning plate 20, two sliding rods 48 with upper, lower, thin and thick upper portions are fixedly disposed on the two side walls of the sealing plate 47, the sliding rods 48 are slidably disposed on the inner wall of the vertical inclined slideways 46, so that when the printing table 13 is lowered to the lowest limit printing position for discharging, the sliding rods 48 on the side walls of the sliding plates 45 can slide to the side wall of the printing table 13 along the vertical inclined slideways 46 (as shown in fig. 8, 9 and 10, the vertical inclined slideways 46 with upper, lower, thin and wide portions overlapping up and lower thin and thick upper sliding rods 48, the limiting tracks of the thin rods and the thick rods are not affected with each other);

the descending of the printing table 13 enables the sliding rod 48 on the side wall of the sliding plate 45 to descend along the vertical inclined slideway 46, so that the printing table 13 and the lower end of the turning plate 20 are always kept sealed, and the phenomenon that the high-temperature printing radiation powder causes dust flying in a mess manner when being recovered is avoided.

As a further scheme of the invention, the front end of the heat preservation box 12 is rotatably provided with a glass door, so that an operator can conveniently observe the interior of the equipment.

As a further scheme of the invention, the slide rod 48 is made of antifriction materials, so that the friction is reduced, and the service life of the equipment is prolonged.

As a further aspect of the present invention, the recovery motor 10 is a high-speed motor, so that the wind power of the circulation fan 22 is increased, the recovery efficiency is improved, and at the same time, hot air in the apparatus flows.

As a further scheme of the present invention, the stepping rod 291 is fixedly disposed on the side wall of the spraying wheel 28 at the rear end, so that the glass door at the front end of the thermal insulation box 12 is not shielded, thereby preventing an operator from observing the working condition of the equipment at any time.

The working principle is as follows: firstly, the device is assembled and electrified, a heater is used for heating the heat preservation box 12 to enable the temperature inside the heat preservation box 12 to reach the proper temperature, printing powder is added into a collection hopper 24 (as shown in figure 2, the upper side in the figure is the upper end surface of the device, the figure is the front end of the device, and the direction of the device is adopted for description), at this time, a recovery motor 10 is started, the recovery motor 10 rotates clockwise (seen from the upper end of the device), the motor 10 rotates to drive a driving gear 30 to rotate clockwise, the driving gear 30 drives a switching gear 31 to rotate anticlockwise, the switching gear 31 rotates and simultaneously receives the rotating torque of the driving gear 30 to drive a shear shaft 32 to move towards the right end of the device along a shear arc hole 33, the upper end of the movement drive of the shear shaft 32 drives an overturning rack 36 to drive an overturning driving wheel 37 to rotate, the overturning driving wheel 37 rotates to drive a cross belt 40 to rotate so as to drive a vertical belt wheel 38 to rotate, the vertical belt wheel 38 rotates to drive the turnover synchronous belt 39 to rotate, so as to drive the turnover shaft 19 at the upper end to rotate anticlockwise (as shown in fig. 6 and 4, the crossing mode of the crossed belt 40 can directly change the rotation direction of the vertical belt wheel 38, the anticlockwise rotation of the turnover shaft 19 is easily realized, and the left side of the device is seen from the right side of the device), as the recovery motor 10 continues to rotate, the shear shaft 32 continues to move towards the other end of the shear circular arc hole 33, so that the turnover shaft 19 rotates to turn the turnover plate 20 to the rear end of the printing table 13 and to be attached to the printing table 13, meanwhile, the turnover shaft 19 drives the circulating fan 22 at the side wall to be disengaged from the circulating shaft 25 when rotating, so that the power of the circulating fan 22 is interrupted and does not rotate, when the shear shaft 32 moves to the other end of the shear circular arc hole 33, the switching gear 31 at the lower end is engaged with the spraying gear 35, so as to drive the spraying gear 35 to rotate, the spraying gear 35 drives the bevel gear group 41 to rotate, so that the stepping rod 291 rotates, the stepping rod 291 rotates to drive the spraying wheel 28 to rotate, the spraying wheel 28 rotates to drive the spraying belt 29 to rotate, the spraying belt 29 rotates to move the sprayer 16 forwards, and meanwhile, the sprayer 16 extracts printing powder from the collecting hopper 24 through the connecting hose 27 and the steel pipe 26 and brushes the printing powder from the printing table 13 to spray the printing powder to the upper end of the printing table 13; at this time, the laser head 11 prints, so that a part of the powder of the printing table 13 is printed into a layer of a required product, after the printing is finished, the recovery motor 10 rotates clockwise (at this time, the torsion spring in the bevel gear set 41 rebounds to reset the sprayer 16), so that the turnover shaft 19 drives the turnover plate 20 to rotate clockwise (as shown in fig. 3 and 4, the sealing arc plate 23 can cling to the upper end edge of the turnover plate 20 when the turnover plate 20 rotates, so that air flowing caused by the rotation of the turnover plate 20 is avoided, so that the powder which is not printed on the printing table 13 is blown everywhere), meanwhile, the driving shaft of the circulation fan 22 is meshed with the circulation shaft 25 at the lower end, along with the continuous rotation of the recovery motor 10, the turnover plate 20 turns to the limit position, the driving shaft of the circulation fan 22 is meshed with the circulation shaft 25 at the lower end, and the switching gear 31 is meshed with the cleaning gear 34, so that the motor continues to rotate, because the shear shaft 32 moves to the extreme position of the shear arc hole 33, the turnover rack 36 cannot drive the turnover driving wheel 37 to continue rotating, at the moment, the motor rotates to drive the cleaning gear 34 to rotate, the cleaning gear 34 rotates to drive the circulating shaft 25 to rotate through the belt on the outer side, and therefore the circulating fan 22 at the upper end rotates, high-temperature powder which is not printed on the printing table 13 is recovered to the collecting hopper 24, the recovery of the printing powder with heat is completed, the continuous printing can be completed by repeating the operation, meanwhile, the feeding lifting motor 9 drives the screw rod 18 to rotate in the thread sleeve 17 every time, and the printing table 13 is gradually descended, so that the laser head 11 is always in an efficient printing distance.