Tray recovery device
Technical Field
The invention relates to the technical field of recycling of trays, in particular to a tray recycling device.
Background
The tray is a device for bearing articles, and with the improvement of the technology, the quality of the tray is higher and higher, so the tray can be recycled for multiple times. Trays are often used in a production line to carry articles, and the used trays are often manually collected and stacked, which not only increases the labor intensity of production line workers but also reduces the productivity.
The conventional tray stacking device is generally shown in a patent structure with the publication number of CN207346748U, and can realize automation of stacking, but when the stacked trays are moved to a specified height and need to be stacked, the stacked trays cannot be stacked simultaneously, and the stacked trays need to be moved before being stacked again. This reduces the efficiency of the palletization. In addition, the current palletizing device is similar to the contents disclosed in the above documents, and before palletizing, the angle of the tray needs to be set to a specified angle, otherwise, the palletized tray is not neat, and even can not be palletized directly.
Disclosure of Invention
The invention aims to: the defects of the prior art are overcome, and the tray recovery device is provided, so that automatic stacking of trays is realized, and continuous stacking work can be realized; the angle of the tray in the feeding cylinder can be automatically corrected, so that the stacked trays are tidy and consistent, the position requirement and the angle requirement of an operator on the position of the tray on the feeding conveyor belt are reduced, and the feeding efficiency of the tray can be improved; through the effect of layer board blowing section of thick bamboo, be convenient for reduce the requirement of operative employee to the layer board blowing, as long as put into layer board blowing section of thick bamboo with the layer board, can both be used for the tray pile up neatly.
The technical scheme adopted by the invention is as follows:
the tray recovery device comprises a vertical cylinder, wherein a support block is movably connected with the vertical cylinder up and down through a piston rod A of a piston A and a symmetrical center line positioned in the vertical direction of the vertical cylinder, a notch A is formed in the side wall of one side of the vertical cylinder, the notch A extends downwards to the bottom of the vertical cylinder, the inner wall of the vertical cylinder is of a square structure matched with the tray structure, the support block is fixed at the end part of the piston rod A, a support plate is placed on the top surface of the support block, the tray is stacked on the top surface of the support plate, when the support plate moves downwards to the maximum stroke position under the action of the piston rod A of the piston A, the height difference between the top surface of the support plate and the upper edge of the notch A is larger than the total height of the stacked trays, an annular notch used for lifting a forklift is formed in the side wall of the support plate, and a positioning groove; a group of photoelectric sensors A is arranged on the inner wall of the vertical cylinder and positioned on the edge of the top of the vertical cylinder.
In a further improvement of the invention, the vertical cylinder is fixed to the ground.
According to a further improvement of the invention, the photoelectric sensor A points to a symmetrical center line of the vertical cylinder in the vertical direction.
According to a further improvement scheme of the invention, a feeding cylinder is coaxially fixed at the top of the vertical cylinder, and the shape of the inner wall of the feeding cylinder is a circle taking the diagonal length of the vertical cylinder as the diameter.
According to a further improvement scheme of the invention, the outer side wall of the vertical cylinder is fixed with the feeding cylinder through a connecting rod.
According to a further improvement scheme of the invention, the connecting rods are arranged in plurality and are uniformly distributed by taking the axis of the feeding cylinder as the center.
According to a further improved scheme of the invention, a correction ring which horizontally rotates around a symmetrical center line in the vertical direction of the vertical cylinder is arranged between the feeding cylinder and the vertical cylinder, a plurality of support rods are uniformly distributed on the correction ring, and the support rods respectively move along the radial direction of the correction ring through piston rods B of pistons B; when the piston rod B drives the support rod to move towards the axis of the correction ring to the maximum stroke, the support rod is positioned in the feeding cylinder, and when the piston rod B drives the support rod to move back to the axis of the correction ring to the maximum stroke, the support rod is positioned outside the feeding cylinder; and two sets of photoelectric sensors B are arranged on the lower portion of the inner wall of the feeding cylinder, and light rays emitted by the photoelectric sensors B are positioned right above two opposite side walls of the vertical cylinder.
According to a further improvement scheme of the invention, the support rods are arc rods, and when the piston rod B drives the support rods to move to the maximum stroke towards the axis of the correction ring, the support rods form a circular ring with the inner diameter smaller than the side length of the tray.
In a further improvement of the invention, the connecting rod is of a C-shaped structure, and the correction ring penetrates through the C-shaped structure of the connecting rod.
According to a further improvement scheme of the invention, when the piston rod A of the piston A drives the supporting plate to move upwards to the maximum stroke position, the height difference between the photoelectric sensor B and the top surface of the supporting plate is smaller than the height of the tray.
According to a further improved scheme of the invention, a horizontal convex ring is coaxially fixed on the outer side wall of the top edge of the vertical cylinder, an annular boss is coaxially arranged on the lower portion of the outer side wall of the horizontal convex ring, a notch B correspondingly matched with the boss is arranged on the lower portion of the inner side wall of the correction ring, transmission teeth are arranged on the surface of the outer side wall of the horizontal convex ring, which is positioned on the upper portion of the annular boss, a gear A matched with the transmission teeth is rotationally connected to the inner wall of the correction ring, the gear A provides driving force through a driving motor, and the driving motor is fixedly connected with the correction ring.
According to a further improved scheme of the invention, a gear B is fixed on an output shaft of the driving motor, and the gear B is in meshing transmission with the gear A.
According to a further improvement of the invention, the gear A and the gear B are rotatably connected in a notch formed in the inner wall of the correction ring.
According to a further improvement scheme of the invention, the top surface and the outer side wall of the annular boss are respectively and rotatably connected with a plurality of balls, the balls are respectively and uniformly distributed by taking the axis of the horizontal convex ring as the center, and the notches B of the correction ring are respectively contacted with the annular boss through the balls.
According to a further improved scheme of the invention, a notch C is formed in the upper portion of the outer side wall of one side of the feeding cylinder, two side edges of the notch C are respectively connected with parallel side plates extending outwards, the distance between the parallel side plates is equal to the diameter of the inner wall of the feeding cylinder, a horizontal feeding rotating shaft is rotatably connected between the parallel side plates, the feeding conveying belt is wound on the feeding rotating shaft, and the feeding conveying belt inclines upwards along the feeding direction.
According to a further improved scheme of the invention, two sides of the feeding conveyor belt are respectively provided with a feeding side plate, and the feeding side plates are respectively fixed with the parallel side plates.
According to a further improved scheme of the invention, a material blocking rod is arranged on the feeding side plate and at the position of the feeding rotating shaft, and the distance between the material blocking rod and the feeding conveying belt at the corresponding position is smaller than the height of the tray.
According to a further improved scheme of the invention, the material blocking rod penetrates through the feeding side plate and is fixed with the end part of a piston rod D of a piston D, the piston D is fixed on the outer side of the feeding side plate, and the piston rod D extends out towards the side of the feeding conveyor belt; when piston rod D withdraws piston D to maximum stroke department, the one end that piston rod D was kept away from to the striker rod flushes with the inside wall of feeding curb plate, and when piston rod D stretched piston D to maximum stroke department, the striker rod one end of keeping away from piston rod D passed the feeding curb plate and extended the top of feeding conveyer belt, the distance between the one end that piston rod D was kept away from to the striker rod and the medial surface of the feeding curb plate that striker rod 42 passed is more than or equal to the distance between the medial surface of the one end that piston rod D was kept away from to the striker rod and the medial surface of opposite side feeding curb plate.
In a further development of the invention, the distance between the feed rotor shaft and the opposite side of the inner wall of the feed cylinder is equal to the diameter of the inner wall of the feed cylinder.
A group of rails perpendicular to the notch A is horizontally arranged at the bottom in the vertical cylinder, the distance between the opposite side walls of the rails is larger than the diameter of the support block, the distance between the outer side walls of the rails is smaller than or equal to the side length of a tray of the vertical cylinder, one end of each rail extends out of the notch A, a push-pull block is arranged between the rails, the push-pull block horizontally moves along the direction of the rails through a piston rod C of a piston C, a push-pull groove matched with the push-pull block is arranged at the bottom of the support plate and positioned outside the positioning groove, and the top height of the push-pull block is higher than the top height of the rails and lower than or equal to the bottom height of the push-pull groove of the support plate when the support; when the push-pull block extends out of the piston C to the maximum stroke position under the action of the piston rod C, the push-pull block is positioned under the push-pull groove of the supporting plate, and when the push-pull block retracts back to the maximum stroke position of the piston C under the action of the piston rod C, the supporting plate connected with the push-pull block in a matching mode is positioned on the outer side of the vertical cylinder.
In a further development of the invention, the piston C is fixed to the ground.
According to a further improvement scheme of the invention, the length of one side of the track extending out of the gap A is more than or equal to the distance between the supporting plate and the vertical cylinder which are connected with the push-pull block in a matching manner when the piston C retracts to the maximum stroke under the action of the piston rod C.
In a further development of the invention, the rail is fixed to the ground by means of a support frame.
In a further improvement scheme of the invention, the push-pull block is of an arc-shaped structure, and the push-pull groove is an annular groove which is matched with the push-pull block and is coaxial with the positioning groove.
A notch D is formed in the bottom of the vertical wall, on one side of the vertical cylinder relative to the notch A, the notch D extends downwards to the bottom of the vertical cylinder, the distance between the upper edge of the notch D and the top surface of the track is larger than or equal to the height of the supporting plate, one end, far away from the piston C, of the track extends out of the notch D, the push-pull block is fixed with the piston rod C through a push-pull rod, the push-pull rod is of a U-shaped structure, the distance between rods on two sides of the push-pull rod is larger than or equal to the diameter of the supporting block, and the push-pull block is fixed on a side rod of the push; when the piston rod C extends out of the piston C to the maximum stroke position, a cross rod connected with the push-pull rod C is located on one side, back to the notch D, of the support block, the push-pull rod extends towards one side, back to the notch A, and extends out of the notch D, a push-pull block used for feeding of the support plate is further fixed at one end, extending out of the notch D, of the push-pull rod, the distance between the two push-pull blocks is equal to the stroke of the piston rod C, a through groove is formed in the middle of the push-pull block used for feeding of the support plate, corresponding to the piston rod A, and the groove width of the through groove is.
According to a further improved scheme of the invention, a supporting plate discharging barrel with an inner wall matched with the supporting plate is fixed above one end, extending out of the notch D, of the rail and positioned at the position of the push-pull block for feeding the supporting plate, a notch E is arranged at the bottom of the side wall, facing the vertical barrel, of the supporting plate discharging barrel, the distance between the edges of the two sides of the notch E is equal to the diameter of the supporting plate, and the distance between the upper edge of the notch E and the top surface of the rail is greater than or equal to the height of the supporting plate.
According to a further improvement scheme of the invention, a supporting plate discharging hopper is coaxially fixed on the top opening edge of the supporting plate discharging barrel, and the inner diameter of the bottom opening of the supporting plate discharging hopper is equal to the inner diameter of the top opening edge of the supporting plate discharging barrel.
In a further development of the invention, the top surface of the carrier is lower than the top surface of the rail when the piston rod a is retracted downwards to the maximum stroke of the piston a.
In a further improvement of the invention, the piston A is fixed in a placing groove arranged on the bottom surface.
The invention has the beneficial effects that:
firstly, the tray recovery device disclosed by the invention realizes automatic stacking of trays and can realize continuous stacking work.
Secondly, the tray recovery device can automatically correct the angle of the tray in the feeding cylinder through the action of the correction ring, so that the stacked trays are tidy and consistent, the requirements of operators on the position and the angle of the tray placed on the feeding conveyor belt are reduced, and the feeding efficiency of the tray can be improved.
Thirdly, the tray recovery device provided by the invention has the advantages that the requirement of operators on the material discharging of the supporting plate is reduced conveniently under the action of the supporting plate material discharging barrel, and the tray recovery device can be used for stacking the trays as long as the supporting plate is placed into the supporting plate material discharging barrel.
Description of the drawings:
fig. 1 is a front sectional view of the tray recovery apparatus.
FIG. 2 is an enlarged top view of the feed drum and stand drum with the feed conveyor removed.
FIG. 3 is a front view, a sectional and enlarged schematic view of the connection between the correction ring and the vertical cylinder.
Fig. 4 is an enlarged bottom view of the cartridge in a position corresponding to the position of the blade.
The specific implementation mode is as follows:
as can be seen from fig. 1 to 4, the tray recovery device of the present invention comprises a vertical cylinder 1, a piston rod a13 of a piston a5 is arranged in the vertical cylinder 1, a support block 15 is vertically and movably connected to a symmetrical center line in the vertical direction of the vertical cylinder 1, a notch A12 is arranged on the side wall of one side of the vertical cylinder 1, the notch A12 extends downwards to the bottom of the vertical cylinder 1, the inner wall of the vertical cylinder 1 is a square structure matched with a tray structure, the support block 15 is fixed at the end part of the piston rod A13, the top surface of the support block 15 is provided with the supporting plate 4, the tray is stacked on the top surface of the supporting plate 4, when the supporting plate 4 moves downwards to the maximum stroke under the action of the piston rod A13 of the piston A5, the height difference between the top surface of the supporting plate 4 and the upper edge of the notch A12 is larger than the total height of the stacked trays, the side wall of the supporting plate 4 is provided with an annular notch 26 for a forklift to fork, and the bottom of the supporting plate 4 is provided with a positioning groove 32 matched with the supporting block 15; a group of photoelectric sensors A41 are arranged on the inner wall of the vertical cylinder 1 and positioned at the top edge.
The vertical cylinder 1 is fixed with the ground.
The photoelectric sensor A41 points to the symmetrical center line of the vertical direction of the vertical cylinder 1.
The top of the vertical cylinder 1 is coaxially fixed with a feeding cylinder 2, and the inner wall of the feeding cylinder 2 is in the shape of a circle with the diameter of the diagonal length of the vertical cylinder 1.
The outer side wall of the vertical cylinder 1 is fixed with the feeding cylinder 2 through a connecting rod 18.
The connecting rods 18 are arranged in a plurality and are uniformly distributed by taking the axis of the feeding cylinder 2 as the center.
A straightening ring 8 which horizontally rotates around a symmetrical center line in the vertical direction of the vertical cylinder 1 is arranged between the feeding cylinder 2 and the vertical cylinder 1, a plurality of support rods 6 are uniformly distributed on the straightening ring 8, and the support rods 6 respectively move along the radial direction of the straightening ring 8 through piston rods B39 of pistons B9; when the piston rod B39 drives the support rod 6 to move to the maximum stroke facing the axis of the correction ring 8, the support rod 6 is positioned in the feeding cylinder 2, and when the piston rod B39 drives the support rod 6 to move to the maximum stroke facing away from the axis of the correction ring 8, the support rod 6 is positioned outside the feeding cylinder 2; and two sets of photoelectric sensors B17 are arranged on the lower part of the inner wall of the feed cylinder 2, and light rays emitted by the photoelectric sensors B17 are positioned right above two opposite side walls of the vertical cylinder 1.
The supporting rods 6 are arc rods, and when the piston rod B39 drives the supporting rods 6 to move to the maximum stroke facing the axis of the correction ring 8, the supporting rods 6 form a circular ring with the inner diameter smaller than the side length of the tray.
The connecting rod 18 is of a C-shaped structure, and the correction ring 8 penetrates through the C-shaped structure of the connecting rod 18.
When the piston rod A13 of the piston A5 drives the supporting plate 4 to move upwards to the maximum stroke, the height difference between the photoelectric sensor B17 and the top surface of the supporting plate 4 is smaller than the height of the tray.
The coaxial horizontal bulge loop 7 that is fixed with of lateral wall at the top border of founding section of thick bamboo 1, the coaxial annular boss 38 that is equipped with in lateral wall lower part of horizontal bulge loop 7, the inside wall lower part of straightening ring 8 is equipped with the breach B that corresponds the matching with boss 38, horizontal bulge loop 7 is located the lateral wall surface on annular boss 38 upper portion and is equipped with driving tooth 37, the inner wall rotation of straightening ring 8 is connected with the gear A24 that matches with driving tooth 37, gear A24 provides drive power through driving motor 23, driving motor 23 and straightening ring 8 fixed connection.
The output shaft of the driving motor 23 is fixed with a gear B36, and the gear B36 is in meshing transmission with a gear A24.
The gear A24 and the gear B36 are rotatably connected to the inner wall of the correction ring 8 in the notch 35.
The top surface and the outer side wall of the annular boss 38 are respectively and rotatably connected with a plurality of balls 25, the balls 25 are respectively and uniformly distributed by taking the axis of the horizontal convex ring 7 as the center, and the gaps B of the straightening ring 8 are respectively contacted with the annular boss 38 through the balls 25.
The utility model discloses a feeding cylinder 2, including feeding cylinder 2, the lateral wall upper portion of one of them side of feeding cylinder 2 is equipped with breach C, the both sides border of breach C is connected with the parallel curb plate 22 of outside extension respectively, distance between the parallel curb plate 22 equals with the inner wall diameter of feeding cylinder 2, it has horizontal feeding pivot 20 to rotate to be connected between the parallel curb plate 22, feeding conveyer belt 19 is around arranging in feeding pivot 20 on, feeding conveyer belt 19 is along the direction tilt up of feeding.
And feeding side plates 21 are respectively arranged on two sides of the feeding conveyor belt 19, and the feeding side plates 21 are respectively fixed with parallel side plates 22.
A material blocking rod 42 is arranged at one end of the feeding rotating shaft 20 on the feeding side plate 21, and the distance between the material blocking rod 42 and the feeding conveying belt 19 at the corresponding position is smaller than the height of the tray.
The material blocking rod 42 penetrates through the feeding side plate 21 and is fixed with the end part of a piston rod D of the piston D, the piston D is fixed on the outer side of the feeding side plate 21, and the piston rod D extends out towards the side where the feeding conveyor belt 19 is located; when piston rod D withdraws piston D to maximum stroke department, the one end that keeps away from piston rod D of striker rod 42 flushes with the inside wall of feeding curb plate 21, and when piston rod D stretched out piston D to maximum stroke department, the one end that the striker rod 42 kept away from piston rod D passed feeding curb plate 21 and extended to the top of feeding conveyer belt 19, the distance between the medial surface of feeding curb plate 21 that the one end that the striker rod 42 kept away from piston rod D and striker rod 42 passed is more than or equal to the distance between the medial surface that the one end that the striker rod 42 kept away from piston rod D and opposite side feeding curb plate 21. (piston D and piston rod D are not shown in the drawings of the specification)
The distance between the feeding rotating shaft 20 and the opposite side of the inner wall of the feeding cylinder 2 is equal to the diameter of the inner wall of the feeding cylinder 2.
A group of rails 3 perpendicular to a notch A12 are horizontally arranged at the bottom in the vertical cylinder 1, the distance between opposite side walls of the rails 3 is larger than the diameter of the support block 15, the distance between the outer side walls of the rails 3 is smaller than or equal to the side length of a tray of the vertical cylinder 1, one end of each rail 3 extends out of the notch A12, a push-pull block 10 is arranged between the rails 3, the push-pull block 10 horizontally moves along the direction of the rails 3 through a piston rod C14 of a piston C11, a push-pull groove 33 matched with the push-pull block 10 is arranged at the bottom of the supporting plate 4 and positioned outside the positioning groove 32, and the top height of the push-pull block 10 is higher than the top surface height of the rails 3 and is lower than or equal to the bottom height of the push-pull groove 33 of; when the push-pull block 10 extends out of the piston C11 to the maximum stroke position under the action of the piston rod C14, the push-pull block 10 is positioned right below the push-pull groove 33 of the supporting plate 4, and when the push-pull block 10 retracts to the maximum stroke position of the piston C11 under the action of the piston rod C14, the supporting plate 4 which is matched and connected with the push-pull block 10 is positioned on the outer side of the vertical cylinder 1.
The piston C11 is fixed to the ground.
The length of one side of the track 3 extending out of the notch A12 is more than or equal to the distance between the supporting plate 4 and the vertical cylinder 1 which are matched and connected with the push-pull block 10 when the piston C11 is retracted to the maximum stroke under the action of the piston rod C14.
The track 3 is fixed to the ground by a support frame 28.
The push-pull block 10 is of an arc-shaped structure, and the push-pull groove 33 is an annular groove which is matched with the push-pull block 10 and has the same axis as the positioning groove 32.
A notch D27 is formed in the bottom of the vertical wall, on one side, opposite to the notch A12, of the vertical cylinder 1, the notch D27 extends downwards to the bottom of the vertical cylinder 1, the distance between the upper edge of the notch D27 and the top surface of the rail 3 is greater than or equal to the height of the supporting plate 4, one end, far away from the piston C11, of the rail 3 extends out of the notch D27, the push-pull block 10 is fixed with a piston rod C14 through a push-pull rod 16, the push-pull rod 16 is of a U-shaped structure, the distance between rods on two sides of the push-pull rod 16 is greater than or equal to the diameter of the supporting block 15, and the push-pull blocks 10 are; when the piston rod C14 extends out of the piston C11 to the maximum stroke, the cross bar of the push-pull rod 16 connected with the piston rod C14 is positioned on one side of the support block 15, which is back to the notch D27, and the push-pull rod 16 extends to one side, which is back to the notch a12, and extends out of the notch D27, one end of the push-pull rod 16, which extends out of the notch D27, is further fixed with a push-pull block 10 for feeding the pallet 4, the distance between the two push-pull blocks 10 is equal to the stroke of the piston rod C14, and the middle part of the push-pull block 10 for feeding the pallet 4 is provided with a through groove 40 corresponding to the piston rod a13, and the width of the through groove 40.
The track 3 stretches out the top of breach D27 one end, is located the push-and-pull piece 10 position department that is used for the layer board 4 feeding and is fixed with the layer board charging barrel 29 that the inner wall matches with layer board 4, layer board charging barrel 29 is equipped with breach E30 towards the lateral wall bottom of founding section of thick bamboo 1 one side, the distance between the both sides border of breach E30 equals the diameter of layer board 4, the distance between the last edge of breach E30 and the track 3 top surface is more than or equal to the height of layer board 4.
And a supporting plate discharging hopper 31 is coaxially fixed on the top opening edge of the supporting plate discharging barrel 29, and the inner diameter of the bottom opening of the supporting plate discharging hopper 31 is equal to that of the top opening edge of the supporting plate discharging barrel 29.
When the piston rod a13 is retracting the piston a1 downward to the maximum stroke, the top surface of the pad 15 is below the top surface of the rail 3.
The piston a5 is fixed in the placing groove 34 arranged on the bottom surface.
When the invention is used, the piston rod C14 of the control piston C11 is at a position of maximum stroke of the extension piston C11;
then, a supporting plate 4 is placed into the supporting plate discharging hopper 31, then the supporting plate 4 falls down to the track 3 along the supporting plate discharging hopper 31 and the supporting plate discharging barrel 29, and at the moment, the push-pull block 10 for feeding the supporting plate 4 is just clamped into a push-pull groove 33 arranged at the bottom of the supporting plate 4;
then the piston C11 is controlled to make the piston rod C14 move to the maximum stroke position in the direction of withdrawing the piston C11, and at the moment, the supporting plate 4 originally at the position of the supporting plate material-placing barrel sequentially passes through the notch E30 and the notch D27 and then just moves into the vertical barrel 1;
then the piston rod A13 of the piston A5 is controlled to extend upwards out of the piston A5, the supporting block 15 is driven to move upwards and is matched and clamped with the positioning groove 32 arranged on the bottom surface of the supporting plate 4; the piston rod a13 of the piston a5 then continues to move upward;
then the piston C11 is controlled, the piston rod C14 extends out of the piston C11 again to the maximum stroke position, and a pallet 4 is put into the pallet discharging hopper 31 again, so that the pallet 4 falls down onto the track 3 along the pallet discharging hopper 31 and the pallet discharging barrel 29, and the push-pull block 10 for feeding the pallet 4 is just clamped into the push-pull groove 33 arranged at the bottom of the pallet 4;
when the piston rod a13 moves upwards to the maximum stroke, the supporting plate 4 does not block the photoelectric sensor a41, so that the photoelectric sensor a41 can normally receive an optical signal;
when the photoelectric sensor A41 and the photoelectric sensor B17 can receive optical signals, the piston rod B39 of the piston B9 drives the supporting rod 6 to extend out of the piston B9 to the maximum stroke position, so that the supporting rod 6 forms a circular ring with the inner diameter smaller than the side length of the tray;
then starting the feeding conveyor belt 19, and sequentially placing trays on the feeding conveyor belt 19;
after a tray on the feeding conveyor belt 19 falls into the feeding cylinder 2 from the feeding conveyor belt 19, the material blocking rod 42 extends to block the tray on the feeding conveyor belt 19;
the trays falling from the feed conveyor 19 are blocked by the ring formed by the support rods 6; at this time, if the optical signal of the photoelectric sensor B17 is blocked by the tray on the supporting rod 6, the driving motor 23 drives the correction ring 8 to rotate, so as to drive the supporting rod 6 and the tray on the supporting rod 6 to rotate until the tray does not block the optical signal of the photoelectric sensor B17 any more;
the piston rod B39 of the piston B9 then retracts the piston B9 so that the carrier bar 6 is outside the feed cylinder 2, thereby dropping the pallet down onto the pallet 4;
the tray dropped onto the supporting plate 4 shields the optical signal of the photoelectric sensor A41, and then the piston rod A13 of the piston A5 drives the supporting plate 4 and the tray on the supporting plate 4 to move downwards until the tray just does not shield the optical signal of the photoelectric sensor A41 any more; at the moment, the piston rod B39 of the piston B9 drives the supporting rod 6 to extend out of the piston B9 to the maximum stroke position again, so that the supporting rod 6 forms a circular ring with the inner diameter smaller than the side length of the tray; the material blocking rod 42 retracts to enable the tray on the feeding conveyor belt 19 to continue to convey forwards;
repeating the steps until the number of the trays on the supporting plate 4 reaches the stacking requirement; then the material blocking rod 42 extends to block the tray on the feeding conveyor belt 19; in addition, the piston rod A13 of the piston A5 continues to move downwards, so that the bottom of the supporting plate 4 is contacted with the track 3, and the piston rod A13 continues to move downwards until the piston rod A13 retreats to the piston A5 to the maximum stroke;
at the moment, the push-pull groove 33 at the bottom of the supporting plate 4 in the vertical cylinder 1 is just in clamping match with the push-pull block 10 at the position corresponding to the vertical cylinder 1;
then the piston rod C14 of the piston C11 retracts to the piston C11, so that the push-pull block 10 respectively pulls out the pallet 4 placed with the stacked pallet in the vertical cylinder 1 and the pallet 4 in the pallet feeding cylinder 29 at the same time, and finally separates the pallet 4 stacked with the stacked pallet from the vertical cylinder 1 and moves the pallet 4 in the pallet feeding cylinder 29 into the vertical cylinder 1;
then the forklift forks the supporting plate 4 stacked with the stacked trays away through the annular notch 26; meanwhile, the piston rod A13 of the piston A5 moves the supporting plate 4 at the position of the vertical cylinder 1 upwards to the maximum stroke again;
then the piston rod C14 of the piston C11 drives the push-pull block 10 to extend to the maximum stroke again, and the above steps are repeated to continuously stack the trays.