A transfer device for printing sand molds for PU seat foaming molds and its use method

Abstract

The present invention provides a transfer device for printing sand molds of PU seat foaming molds and a method for using the same, which relates to a transfer structure including a transfer frame and a hanger, wherein an aerial hanging rail is set up between the starting point and the ending point of the transfer, and the transfer frame is connected to the aerial hanging rail through the hanger guide at the top, and a group of winding ropes are fixed at both ends of the hanger, and the two groups of winding ropes are respectively connected to the winding devices at the starting point and the ending point. The winding device drives the hanger to and from the starting point and the ending point by retracting and releasing the winding ropes, and the transfer frame is used to clamp the sand mold for printing the PU seat foaming mold and move it back and forth between the starting point and the ending point with the hanger. The present invention can not only achieve a stable one-time transfer effect of multiple groups of sand molds, but also reduce the dependence on the ground flatness requirement, while also reducing the influence of external impact force and reducing the probability of collision.

Description

Technical Field

[0001] The present invention relates to a transfer structure, in particular to a transfer device for printing sand molds of a PU seat foaming mold and a use method thereof. Background Art

[0002] The current method of improving the casting process is to use 3D printing sand mold technology to directly print sand molds, so that castings with complex shapes, high precision and smooth surfaces can be produced. Compared with traditional casting methods, it can improve product quality, shorten the mold production cycle, and reduce mold production costs. Specifically, a patent for a sand mold for PU seat foaming mold (publication number CN216297904U) is the application of sand molds in PU seat foaming molds. The lower sand mold disclosed therein is integrally formed by a 3D printer, and the bottom of the lower sand mold is set to a cross-shaped cavity, which can reduce the weight of the sand mold to a certain extent and reduce the cost of sand mold production.

[0003] In the sand mold used for the PU seat foaming mold molding mentioned above, after the lower sand mold is printed and formed, since the basic raw materials for manufacturing the sand mold are still casting sand and molding sand binder, the sand mold itself is also prone to collision and damage during transportation. During the casting process, the sand mold inevitably needs to be transported to the next workstation by a transfer vehicle for operation. When the sand mold is moved to the transfer vehicle, it is inevitable that a large impact force may be generated, which may easily cause damage to the sand mold. In order to solve the above technical problems, a patented sand mold transfer device for coated sand casting (Announcement No. CN212884993U) provides a transfer device that can effectively provide shock absorption, making the transfer process safer and more reliable. Although this type of transfer device can realize the transfer of multiple sets of molding sand and improve the transfer efficiency, it is still limited by the flatness of the ground. If the ground is uneven, it is very easy to cause collisions. In addition, the operation of transferring the operation position during the transfer process is also prone to displacement during movement, causing position accuracy errors in subsequent continuous production. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a transfer device for printing sand molds for PU seat foaming molds and a method of using the same, which can not only achieve a stable one-time transfer effect of multiple groups of sand molds, but also reduce the dependence on the flatness requirements of the ground. At the same time, it can also reduce the influence of external impact force and reduce the probability of bumps.

[0005] The present invention provides the following technical solutions:

[0006] A transfer device for printing sand molds for PU seat foaming molds comprises a transfer frame and a hanger, wherein an aerial hanging rail is erected between the starting point and the end point of the transfer, the transfer frame is connected to the aerial hanging rail via a hanger guide at the top, a set of winding ropes (1) is fixed to each end of the hanger, and the two sets of winding ropes (1) are respectively connected to winding devices at the starting point and the end point, the winding devices drive the hanger to and from the starting point and the end point by retracting and releasing the winding ropes (1), and the transfer frame is used to hold the PU seat foaming mold printing sand mold and move back and forth with the hanger between the starting point and the end point;

[0007] Since the transfer rack adopts a suspended transfer method as a whole, it will not be affected by the flatness of the ground during transportation, has better stability, and can also reduce the probability of bumps.

[0008] Preferably, in order to save the cost of erecting the aerial hanging rail, the aerial hanging rail is provided with two groups of parallel steel ropes, the two ends of the steel ropes are respectively fixed at the starting point and the ending point, and two rows of sliding sleeve groups slidingly sleeved outside the steel ropes are fixed at the top of the hanger, and each row of sliding sleeve groups is provided with at least two groups of sliding sleeve units.

[0009] Preferably, in order to ensure that multiple groups of sand molds can be transferred each time, the transfer frame can be provided with a hanging end side plate and a fixed side plate connected and fixed by a central rod group, and at least two groups of shaft rods are evenly distributed on the edges between the hanging end side plate and the fixed side plate along the circumference, and each group of slings is correspondingly connected to the outside of a group of shaft rods through a shaft sleeve, and the hanger includes an upper hanging block and a lower hanging block, and the lower hanging block is vertically guided and slidably connected in the upper hanging block, and a group of electric hoists is installed on the upper hanging block, and the driving end of the electric hoist is connected to the lower hanging block through a winding rope 2, and the bottom side of the lower hanging block is fixedly connected with a group of outer frames, and the fixed side plates are transfer-mounted in the outer frame and driven to rotate by a driving motor 1 installed on the outer frame;

[0010] Therefore, when the electric hoist retracts and releases the second rope, the overall height position of the transfer frame can be adjusted by raising and lowering the lower hanging block and the outer frame. That is, after each set of slings completes the clamping of the sand mold, the electric hoist drives the lower hanging block, the outer frame, and the transfer frame to rise to a certain height, leaving space for the drive motor to rotate the transfer frame, and after the drive motor drives the transfer frame to rotate a certain angle in the circumferential direction so that the next set of slings is located at the bottom layer, the lower hanging block, the outer frame, and the transfer frame can be controlled to descend again so that the slings at the bottom layer can clamp the sand mold, and since the transfer frame and the sling are connected by a shaft rod and a shaft sleeve, when the transfer frame rotates, the sling can automatically rotate around the shaft rod under the action of its own gravity to adjust the angle, so that the sling and the clamped sand mold can always be placed in the correct vertical direction.

[0011] Preferably, in order to improve the transfer balance effect, the transfer frame can be provided with two groups symmetrically distributed about the hanger, and the fixed side plates of the two groups of transfer frames are fixedly connected to form a transfer block installed in the outer frame, an outer gear ring 1 is fixed to the outside of the transfer block, and the driving end of the drive motor 1 is provided with an outer gear 1 for driving connection with the outer gear ring 1;

[0012] Since there are two groups of transfer racks, which are symmetrically distributed on both sides of the hanger, when the hanger drives the transfer rack to slide along the aerial hanging rail guide, the forces on both sides of the aerial hanging rail and the hanger can be balanced. Therefore, the balance and stability of the transfer rack can be better when it is transferred back and forth.

[0013] Preferably, the center rod group includes a central axis passing through the adapter block and multiple groups of reinforcing shafts surrounding the outside of the central axis, and both ends of the central axis are provided with external thread rings for threaded connection with the hanging end side plates, one end of the reinforcing shaft and the shaft rod is fixed on the adapter block, and the other end thereof is guided to pass through the hanging end side plate. A second drive motor is also installed in the adapter block, and the driving end of the second drive motor is meshed and connected with the second external gear ring outside the central axis through a second external gear, and the external thread rings at both ends of the central axis rotate in opposite directions;

[0014] Therefore, when the central axis rotates, the two sets of suspension side plates can be controlled to move toward or away from each other. When the suspension side plates clamp the shaft sleeve inward, the sling can be clamped and positioned after all the slings are clamped to avoid the sling from swinging during transportation. When the suspension side plates move outward, the two ends of the shaft sleeve of the sling will not be clamped by the suspension side plates and the fixed side plates, so that free adjustment and rotation around the shaft rod can be achieved.

[0015] Preferably, in order to improve the stability and reliability of the hanger transfer product, the hanger is provided with two sets of clamping bodies connected to the two sides of the shaft sleeve, a set of clamping screws are installed in the shaft sleeve, and the two sets of clamping bodies are installed on the outside of the clamping screws with opposite threads, and the clamping motor on the shaft sleeve is used to drive the clamping screws to rotate to drive the two sets of clamping bodies to move towards each other to clamp the sand mold, and the sand mold is placed on the bottom cavity plate, and the cross-shaped cavity provided at the bottom end thereof is positioned and matched with the boss of the bottom cavity plate. The bottom end of the clamping body is also provided with an insertion rod for plugging and matching with the two sides of the bottom cavity plate, and when clamping, the inner side of the clamping body is used to fit and clamp the peripheral side wall of the sand mold;

[0016] Since a bottom cavity plate with positioning cooperation is arranged on the bottom side of the sand mold, when the clamping body of the sling is clamped, the bottom side is inserted into the bottom cavity plate, and the bottom side of the clamping body is fitted and tightly clamped to the peripheral side wall of the sand mold, so that the stability and reliability are better when the sand mold is clamped for transfer.

[0017] Preferably, a transition platform is provided at the starting point and the ending point of the transfer. In order to facilitate the combination and separation of the bottom cavity plate and the sand mold during the sand mold transfer process, a group of accommodating grooves can be set on the transition platform. A top cylinder is installed at the bottom of the cavity of the accommodating groove, and two groups of conveyor belts are provided on both sides of the opening. At the starting point, the sand mold is placed on the conveyor belt and transported to the top of the accommodating groove by the conveyor belt. The top driving plate of the top cylinder pushes out the bottom cavity plate in the accommodating groove, and the bottom cavity plate cooperates with the bottom support of the sand mold. After the lifting of the bottom cavity plate, the bottom side of the sand mold is separated from the conveyor belt and the bottom side of the bottom cavity plate is separated from the receiving tank, and then the bottom cavity plate and the sand mold are prepared for the subsequent clamping of the bottom cavity plate and the sand mold by the lifting tool. At the end point, the lifting tool places the bottom cavity plate and the sand mold above the receiving tank, and the driving plate at the top of the lifting cylinder is supported on the bottom side of the bottom cavity plate. After the lifting tool releases the clamping, the lifting cylinder supports the bottom cavity plate to descend so that the bottom cavity plate is placed in the receiving tank, and the sand mold is placed on the conveyor belts on both sides, thereby completing the separation of the bottom cavity plate and the sand mold, which is conducive to the recycling of the bottom cavity plate.

[0018] Preferably, a transfer device for printing sand molds of a PU seat foaming mold described above includes the following steps:

[0019] S1: At the starting point, the sand mold is placed on the conveyor belt and transported to the top of the receiving tank by the conveyor belt. The top driving plate of the lifting cylinder pushes out the bottom cavity plate in the receiving tank. After the bottom cavity plate is supported on the bottom of the sand mold, the bottom cavity plate is continuously lifted to separate the bottom side of the sand mold from the conveyor belt and the bottom side of the bottom cavity plate from the receiving tank.

[0020] S2: When a group of slings are rotated into place above the accommodating tank, the electric hoist drives the second winding rope to unwind, and drives the lower lifting block and the outer frame to descend to drive the transfer frame to descend as a whole until the clamping body descends to both sides of the sand mold, and starts the rotation of the clamping screw rod so that the bottom end plug rods of the two groups of clamping bodies are plugged into and matched on both sides of the bottom cavity plate, and the inner sides of the clamping bodies are tightly clamped on the peripheral side walls of the sand mold to complete the clamping operation of the sling. Then, the electric hoist drives the lower lifting block, the outer frame and the transfer frame to rise again to leave space for the driving motor to drive the rotating transfer frame, and when the driving motor drives the transfer frame to rotate circumferentially so that the next group of slings in the circumferential direction is located above the accommodating tank, the lower lifting block, the outer frame and the transfer frame are controlled to descend again so that the sling above the accommodating tank can clamp the sand mold, and after the clamping is completed, the electric hoist drives the lower lifting block, the outer frame and the transfer frame to rise again until all the slings complete the clamping;

[0021] S3: When all the spreaders have completed the clamping, the winding device at the end point is started to reel in the rope 1, and the winding device at the starting point is started to unwind the rope 1. The hanger can drive the transfer frame to move along the aerial hanging rail to the end point;

[0022] S4: At the end point, the driving motor drives the transfer frame to rotate in the circumferential direction, so that a group of spreaders clamp the bottom cavity plate and the sand mold are placed above the receiving tank, and the driving plate at the top of the top cylinder rises and supports the bottom side of the bottom cavity plate. After the spreader releases the clamping, the top cylinder supports the bottom cavity plate to descend so that the bottom cavity plate is placed in the receiving tank, and the sand mold is placed on the conveyor belts on both sides of the transition platform to complete the separation of the bottom cavity plate and the sand mold. The sand mold is output by the conveyor belt, and after the bottom cavity plate is taken out, the driving motor drives the transfer frame to rotate in the circumferential direction again, so that another group of spreaders clamp the bottom cavity plate and the sand mold are placed above the receiving tank, and the driving plate at the top of the top cylinder rises and supports the bottom side of the bottom cavity plate again. After the spreader releases the clamping, the top cylinder supports the bottom cavity plate to descend so that the bottom cavity plate is placed in the receiving tank, and the sand mold is placed on the conveyor belts on both sides of the transition platform until the separation of the bottom cavity plates and sand molds in all spreaders is completed.

[0023] The beneficial effects of the present invention are:

[0024] 1. An aerial hanging rail is set up between the starting point and the end point of the transfer. The aerial hanging rail can be a slide rail set up between the starting point and the end point, or a steel wire rope with lower cost can be used. If a steel wire rope is used, in order to improve the stability of the aerial transfer, two sets of parallel steel wire ropes can be set, and each set of steel wire ropes corresponds to at least two sets of sliding sleeves set outside the steel wire ropes. The transfer frame is installed on the aerial hanging rail through the hanger. A rope reel is fixed at both ends of the hanger. The two sets of rope reels are respectively connected to the winding devices at the starting point and the end point to complete the position transfer of the hanger and the transfer device between the starting point and the end point. Since the transfer frame adopts the suspension transfer method as a whole, it will not be affected by the flatness of the ground during transfer, and the stability is better, and the probability of collision can also be reduced.

[0025] 2. In order to ensure that multiple groups of sand molds can be transferred each time, the transfer rack can be set as a frame that rotates along the circumferential direction, and at least two groups of lifting tools are distributed along the circumference of the frame. After each group of lifting tools lifts the sand mold, it can rotate along the circumferential direction by a certain angle, so that the next group of lifting tools is located at the bottom layer to clamp the sand mold. In order to adapt to the rotation of the transfer rack, the hanger is provided with an upper hanging block and a lower hanging block connected vertically in a sliding manner. The lower hanging block is connected to the electric hoist on the upper hanging block through a second winding rope. Therefore, the lifting position of the lower hanging block and the transfer rack can be adjusted by retracting and releasing the second winding rope by the electric hoist.

[0026] 3. After the sand mold is clamped and rotated circumferentially, in order to ensure that the sand mold can always be placed vertically in the correct direction, a shaft and a shaft sleeve are connected between the transfer frame and the spreader. When the transfer frame rotates, the spreader holding the sand mold automatically rotates around the shaft sleeve under the action of its own gravity to adjust the angle, so that the sand mold can always be placed vertically in the correct direction;

[0027] 4. In order to improve the stability of the sand mold during the transfer process, that is, to prevent each group of spreaders from swinging and rotating around the shaft, an external thread ring can be set at the end of the central shaft. The hanging end side plate of the transfer frame is connected to the central shaft through a drop connection. When the central shaft rotates, the hanging end side plate can be controlled to clamp the shaft sleeve inward to position the spreader after all spreaders are clamped.

[0028] 5. In order to improve the stability and reliability of the hanger transfer product, a hanger is provided with two sets of clamping bodies. The two sets of clamping bodies are driven by clamping screws to clamp. The sand mold is placed on the bottom cavity plate, and the cross-shaped cavity set at the bottom end is positioned and matched with the boss of the bottom cavity plate. After the bottom cavity plate and the sand mold are placed on the transition platform at the starting point, the bottom end of the clamping body can be plugged and matched with the two sides of the bottom cavity plate. When clamping, the inner side of the clamping body can fit tightly against the peripheral side wall of the sand mold, and the bottom of the sand mold can be positioned on the bottom cavity plate. Therefore, when the sand mold is tightly clamped for transfer, the stability and reliability are better;

[0029] 6. In order to facilitate the combination and disassembly of the bottom cavity plate and the sand mold during the sand mold transportation process, a group of receiving tanks can be set on the transition platform. The bottom of the receiving tank is installed with a top cylinder, and two groups of conveyor belts are provided on both sides. At the starting point, the sand mold is placed on the conveyor belt and transported to the top of the receiving tank by the conveyor belt. The top cylinder pushes out the bottom cavity plate in the receiving tank, and after the bottom cavity plate is supported on the bottom of the sand mold, continuing to lift the bottom cavity plate can make the bottom side of the sand mold separate from the conveyor belt and the bottom side of the bottom cavity plate separate from the receiving tank, and then prepare for the subsequent hoisting tool to clamp the bottom cavity plate and the sand mold. At the end point, the hoisting tool places the bottom cavity plate and the sand mold above the receiving tank, and the top of the top cylinder is supported on the bottom side of the bottom cavity plate. After the hoist releases the clamping, the top cylinder supports the bottom cavity plate to descend so that the bottom cavity plate is placed in the receiving tank, and the sand mold is placed on the conveyor belts on both sides, thereby completing the separation of the bottom cavity plate and the sand mold, which is conducive to the recycling of the bottom cavity plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 It is a structural cross-sectional view of the present invention;

[0032] Figure 2 It is a side structural cross-sectional view of the transfer rack;

[0033] Figure 3 It is a structural cross-section of the spreader;

[0034] Figure 4 This is a structural cross-sectional view of the spreader located on the transition platform;

[0035] Markings in the figure: 1 is the transfer rack, 2 is the hanger, 3 is the sand mold, 4 is the bottom cavity plate, 5 is the transition platform,

[0036] 11 is the hanging end side plate, 12 is the fixed side plate, 13 is the shaft rod, 14 is the hanger, 15 is the shaft sleeve, 17 is the central shaft, 18 is the reinforcement shaft, 19 is the second drive motor,

[0037] 21 is a sliding sleeve unit, 22 is an upper hanging block, 23 is a lower hanging block, 24 is an electric hoist, 25 is a second winding rope, 26 is an outer frame, 27 is a driving motor 1,

[0038] 141 is the clamp body, 142 is the clamp screw, 143 is the clamp motor,

[0039] 51 is a receiving tank, 52 is a top cylinder, and 53 is a conveyor belt. DETAILED DESCRIPTION

[0040] Example 1

[0041] like Figure 1 As shown, a transfer device for printing sand molds for PU seat foaming molds, in this embodiment, includes a transfer frame 1 and a hanger 2, and an aerial hanging rail is set up between the starting point and the end point of the transfer, the transfer frame 1 is connected to the aerial hanging rail through the guide of the hanger 2 on the top, and a group of winding ropes 1 are fixed to both ends of the hanger 2, and the two groups of winding ropes 1 are respectively connected to the winding devices at the starting point and the end point, and the winding device drives the hanger 2 to and from the starting point and the end point by retracting and releasing the winding ropes 1, and the transfer frame 1 is used to clamp the PU seat foaming mold printing sand mold 3 and move back and forth with the hanger 2 between the starting point and the end point;

[0042] Since the transfer rack 1 is entirely transferred by suspension, it is not affected by the flatness of the ground during transportation, has better stability, and can also reduce the probability of collision.

[0043] Example 2

[0044] like Figure 1 As shown, a transfer device for printing sand molds of PU seat foaming molds is provided. In this embodiment, it is a further improvement based on Example 1. In order to save the cost of erecting an aerial hanging rail, the aerial hanging rail is provided with two groups of parallel steel wire ropes, and the two ends of the steel wire ropes are respectively fixed at the starting point and the end point, and two rows of sliding sleeve groups are fixed on the top of the hanger 2. The sliding sleeve groups are slidably sleeved outside the steel wire ropes, and each row of sliding sleeve groups is provided with at least two groups of sliding sleeve units 21.

[0045] Example 3

[0046] like Figure 1-3As shown, a transfer device for printing sand molds for PU seat foaming molds is provided. In this embodiment, it is a further improvement based on Example 1. In order to ensure that the transfer of multiple groups of sand molds 3 can be achieved each time, the transfer frame 1 can be provided to include a hanging end side plate 11 and a fixed side plate 12 connected and fixed by a central rod group. The edge between the hanging end side plate 11 and the fixed side plate 12 is evenly distributed with at least two groups of shafts 13 along the circumferential direction. Each group of slings 14 is correspondingly connected to the outside of a group of shafts 13 through a shaft sleeve 15. The hanger 2 includes an upper hanging block 22 and a lower hanging block 23. The lower hanging block 23 is vertically guided and slidably connected in the upper hanging block 22, and a group of electric hoists 24 are installed on the upper hanging block 22. The driving end of the electric hoist 24 is connected to the lower hanging block 23 through a winding rope 25. The bottom side of the lower hanging block 23 is fixedly connected to a group of outer frames 26. The fixed side plate 12 is installed in the outer frame 26 and is driven to rotate by a driving motor 27 installed on the outer frame 26.

[0047] When the lifting device 1 is lifted up, the lifting block 23 and the outer frame 26 are lifted and lowered, and the lifting device 1 is lifted and lowered, the lifting device 1 is lifted and lowered, and the lifting device 1 is lowered and lowered, so that the lifting device 1 is lifted and lowered.

[0048] In order to improve the balance effect of transfer, the transfer frame 1 can be provided with two groups symmetrically distributed about the hanger 2, and the fixed side plates 12 of the two groups of transfer frames 1 are fixedly connected to form a transfer block installed in the outer frame 26, an outer gear ring 1 is fixed to the outside of the transfer block, and the driving end of the drive motor 1 27 is provided with an outer gear 1 for driving connection with the outer gear ring 1;

[0049] Since there are two groups of transfer racks 1, which are symmetrically distributed on both sides of the hanger 2, when the hanger 2 drives the transfer rack 1 to slide along the aerial hanging rail guide, the forces on both sides of the aerial hanging rail and the forces on the hanger 2 can be balanced. Therefore, the balance and stability of the transfer rack 1 can be better when it is transferred back and forth.

[0050] The center rod group includes a center shaft 17 passing through the adapter block and multiple groups of reinforcing shafts 18 surrounding the outside of the center shaft 17. Both ends of the center shaft 17 are provided with external thread rings for threaded connection with the hanging end side plates 11. One end of the reinforcing shaft 18 and the shaft 13 is fixed to the adapter block, and the other end thereof is guided to pass through the hanging end side plate 11. A second drive motor 19 is also installed in the adapter block. The driving end of the second drive motor 19 is meshed with the second external gear ring outside the center shaft 17 through the second external gear, and the external thread rings at both ends of the center shaft 17 have opposite rotation directions.

[0051] Therefore, when the central shaft 17 rotates, the two sets of suspension side plates 11 can be controlled to move toward or away from each other. When the suspension side plates 11 clamp the shaft sleeves 15 inwardly, the slings 14 can be clamped and positioned after all the slings 14 are clamped to avoid the slings 14 from swinging during transportation. When the suspension side plates 11 move outward, the two ends of the shaft sleeves 15 of the slings 14 are not clamped by the suspension side plates 11 and the fixed side plates 12, so that free adjustment and rotation around the shaft rod 13 can be achieved.

[0052] In order to improve the stability and reliability of the hanger 2 in transferring products, the hanger 14 is provided with two sets of guiding clamping bodies 141 connected to both sides of the shaft sleeve 15, and a set of clamping screw rods 142 are installed in the shaft sleeve 15. The two sets of clamping bodies 141 are installed on the outside of the clamping screw rods 142 with opposite threads. A clamping motor 143 is provided on the shaft sleeve 15, and the driving gear of the clamping motor 143 is drivingly connected to the outer gear ring of the clamping screw rod 142 for driving the clamping screw rod 142 to rotate so as to drive the two sets of clamping bodies 141 to move toward each other to clamp the sand mold 3, and the sand mold 3 is placed on the bottom cavity plate 4, and the cross-shaped cavity provided at the bottom end thereof is positioned and matched with the boss of the bottom cavity plate 4. The bottom end of the clamping body 141 is also provided with a plug rod for plugging and matching on both sides of the bottom cavity plate 4, and when clamping, the inner side of the clamping body 141 is used to fit and clamp the peripheral side wall of the sand mold 3;

[0053] Since a bottom cavity plate 4 for positioning and matching is arranged on the bottom side of the sand mold 3, when the clamping body 141 of the sling 14 clamps, the bottom side is inserted into the bottom cavity plate 4, and the bottom side of the clamping body 141 fits tightly against the peripheral side wall of the sand mold 3, so that when the sand mold 3 is clamped for transfer, the stability and reliability are better.

[0054] Example 4

[0055] like Figure 4As shown, a transfer device for printing sand molds for PU seat foaming molds is provided. In this embodiment, a transition platform 5 is provided at the starting point and the ending point of the transfer. In order to facilitate the combination and disassembly of the bottom cavity plate 4 and the sand mold 3 during the transfer of the sand mold 3, a group of accommodating grooves 51 can be set on the transition platform 5. A top cylinder 52 is installed at the bottom of the cavity of the accommodating groove 51, and two groups of conveyor belts 53 are provided on both sides of the opening thereof. At the starting point, the sand mold 3 is placed on the conveyor belt 53 and is transported to the top of the accommodating groove 51 by the conveyor belt 53. The top driving plate of the top cylinder 52 pushes out the bottom cavity plate 4 in the accommodating groove 51, and After the bottom of the sand mold 3 is supported, the bottom cavity plate 4 is continued to be lifted to separate the bottom side of the sand mold 3 from the conveyor belt 53 and the bottom side of the bottom cavity plate 4 from the receiving groove 51, and then to prepare for the subsequent sling 14 to clamp the bottom cavity plate 4 and the sand mold 3. At the end point, the sling 14 places the bottom cavity plate 4 and the sand mold 3 above the receiving groove 51, and the driving plate at the top of the top cylinder 52 is supported on the bottom side of the bottom cavity plate 4. After the sling 14 releases the clamping, the top cylinder 52 supports the bottom cavity plate 4 to descend so that the bottom cavity plate 4 is placed in the receiving groove 51, and the sand mold 3 is placed on the conveyor belts 53 on both sides, thereby completing the separation of the bottom cavity plate 4 and the sand mold 3, which is conducive to the recycling of the bottom cavity plate 4.

[0056] A method for using a PU seat foam mold printing sand mold, based on the above-mentioned PU seat foam mold printing sand mold transfer device, includes the following steps:

[0057] S1: At the starting point, the sand mold 3 is placed on the conveyor belt 53 and transported to the top of the receiving tank 51 by the conveyor belt 53. The top driving plate of the lifting cylinder 52 pushes the bottom cavity plate 4 in the receiving tank 51 out. After the bottom cavity plate 4 is supported on the bottom of the sand mold 3, the bottom cavity plate 4 is continuously lifted up to separate the bottom side of the sand mold 3 from the conveyor belt 53 and the bottom side of the bottom cavity plate 4 from the receiving tank 51.

[0058] S2: A group of slings 14 is rotated into place above the accommodating groove 51, and the electric hoist 24 drives the second winding rope 25 to unwind, which drives the lower hanging block 23 and the outer frame 26 to descend, thereby driving the overall height of the transfer frame 1 to descend until the clamping body 141 descends to both sides of the sand mold 3, and the clamping screw rod 142 is started to rotate, so that the bottom end plug rods of the two groups of clamping bodies 141 are plugged into both sides of the bottom cavity plate 4, and the inner side of the clamping body 141 is tightly fitted on the peripheral side wall of the sand mold 3 to complete the clamping operation of the sling 14, and then the electric hoist 24 drives the lower hanging block 23 and the outer frame 26 to descend again. The outer frame 26 and the transfer frame 1 rise to leave space for the drive motor 27 to drive the transfer frame 1 to rotate. After the drive motor 27 drives the transfer frame 1 to rotate circumferentially so that the next group of spreaders 14 in the circumferential direction is located above the accommodating groove 51, the lower lifting block 23, the outer frame 26 and the transfer frame 1 are controlled to descend again so that the spreaders 14 above the accommodating groove 51 can clamp the sand mold 3. After the clamping is completed, the electric hoist 24 drives the lower lifting block 23, the outer frame 26 and the transfer frame 1 to rise again until all the spreaders 14 have completed the clamping.

[0059] S3: After all the spreaders 14 have completed the clamping, the winding device at the end point is started to reel in the rope 1, and the winding device at the starting point is started to unwind the rope 1, and the hanger 2 can drive the transfer frame 1 to move along the aerial hanging rail to the end point;

[0060] S4: At the end point, the driving motor 27 drives the transfer frame 1 to rotate in the circumferential direction, so that a group of spreaders 14 clamp the bottom cavity plate 4 and the sand mold 3 and place them above the accommodating tank 51. The driving plate at the top of the top cylinder 52 rises and supports the bottom side of the bottom cavity plate 4. After the spreader 14 releases the clamping, the top cylinder 52 supports the bottom cavity plate 4 to descend so that the bottom cavity plate 4 is placed in the accommodating tank 51, and the sand mold 3 is placed on the conveyor belts 53 on both sides of the transition platform 5 to complete the separation of the bottom cavity plate 4 and the sand mold 3. The sand mold 3 is output by the conveyor belt 53, and After taking out the bottom cavity plate 4, the driving motor 27 drives the transfer frame 1 to rotate circumferentially again, so that another set of slings 14 clamps the bottom cavity plate 4 and the sand mold 3 and places them above the accommodating groove 51. The driving plate at the top of the top cylinder 52 rises again and supports the bottom side of the bottom cavity plate 4. After the sling 14 releases the clamping, the top cylinder 52 supports the bottom cavity plate 4 to descend so that the bottom cavity plate 4 is placed in the accommodating groove 51, and the sand mold 3 is placed on the conveyor belts 53 on both sides of the transition platform 5 until the separation of the bottom cavity plate 4 and the sand mold 3 in all slings 14 is completed.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A transfer device for printing sand molds of PU seat foaming molds, characterized in that: The invention comprises a transfer frame (1) and a hanger (2), and an aerial hanging rail is set up between the starting point and the end point of the transfer, the transfer frame (1) is connected to the aerial hanging rail through the top hanger (2), a group of winding ropes are fixed to both ends of the hanger (2), and the two groups of winding ropes are connected to the winding devices at the starting point and the end point respectively, and the winding devices drive the hanger (2) to go back and forth between the starting point and the end point by retracting and releasing the winding ropes, and the transfer frame (1) is used to clamp the PU seat foaming mold printing sand mold (3) and move back and forth between the starting point and the end point along with the hanger (2); The aerial hanging rail adopts two sets of parallel steel wire ropes, the two ends of the steel wire ropes are fixed at the starting point and the end point respectively, and the top of the hanger (2) is fixed with two rows of sliding sleeve groups which are slidably sleeved outside the steel wire ropes, and each row of sliding sleeve groups is provided with at least two sets of sliding sleeve units (21); The transfer frame (1) includes a hanging end side plate (11) and a fixed side plate (12) connected and fixed by a central rod group, at least two groups of shaft rods (13) are evenly distributed along the circumference of the edge between the hanging end side plate (11) and the fixed side plate (12), each group of slings (14) is connected to the outside of a group of shaft rods (13) through a shaft sleeve (15), and the hanger (2) includes an upper hanging block (22) and a lower hanging block (23), and the lower hanging block (23) is vertically guided. The upper hanging block (22) is connected to the upper hanging block (22) by sliding, and a group of electric hoists (24) are installed on the upper hanging block (22). The driving end of the electric hoist (24) is connected to the lower hanging block (23) through a second winding rope (25). The bottom side of the lower hanging block (23) is fixedly connected to a group of outer frames (26). The fixed side plates (12) are installed in the outer frames (26) and are driven to rotate by a driving motor (27) installed on the outer frames (26).

2. A transfer device for printing sand molds of PU seat foaming molds according to claim 1, characterized in that: The transfer frame (1) is provided with two groups symmetrically distributed about the hanger (2), and the fixed side plates (12) of the two groups of transfer frames (1) are fixedly connected to form a transfer block installed in the outer frame (26), an outer gear ring 1 is fixed outside the transfer block, and the driving end of the driving motor 1 (27) is provided with an outer gear 1 for driving connection with the outer gear ring 1.

3. A transfer device for printing sand molds of PU seat foaming molds according to claim 2, characterized in that: The center rod group includes a center shaft (17) passing through the adapter block and multiple groups of reinforcing shafts (18) surrounding the center shaft (17), and both ends of the center shaft (17) are provided with external thread rings for threaded connection with the suspension side plate (11). One end of the reinforcing shaft (18) and the shaft rod (13) is fixed on the adapter block, and the other end thereof is guided to pass through the suspension side plate (11). A second drive motor (19) is also installed in the adapter block. The driving end of the second drive motor (19) is meshed with the second external gear ring outside the center shaft (17) through the second external gear, and the external thread rings at both ends of the center shaft (17) rotate in opposite directions.

4. A transfer device for printing sand molds for PU seat foaming molds according to any one of claims 2-3, characterized in that: The sling (14) comprises two sets of clamping bodies (141) connected to both sides of the shaft sleeve (15), a set of clamping screw rods (142) are installed in the shaft sleeve (15), the two sets of clamping bodies (141) are installed on the outside of the clamping screw rod (142) with opposite thread rotation directions, a clamping motor (143) is provided on the shaft sleeve (15), and the driving gear of the clamping motor (143) is connected to the outer gear ring of the clamping screw rod (142) for driving The clamping screw (142) rotates to drive the two groups of clamping bodies (141) to move toward each other to clamp the sand mold (3), and the sand mold (3) is placed on the bottom cavity plate (4). The cross-shaped cavity provided at the bottom end thereof is positioned and matched with the boss of the bottom cavity plate (4). The bottom end of the clamping body (141) is also provided with an insertion rod for plugging and matching on both sides of the bottom cavity plate (4), and when clamping, the inner side of the clamping body (141) is used to fit and clamp the peripheral side wall of the sand mold (3).

5. The transfer device for printing sand molds of PU seat foaming molds according to claim 4, characterized in that: A transition platform (5) is provided at both the starting point and the ending point of the transfer, and a group of accommodating grooves (51) are provided on the transition platform (5), and a top cylinder (52) is installed at the bottom of the cavity of the accommodating groove (51), and two groups of conveyor belts (53) are provided on both sides of the opening thereof. At the starting point, the sand mold (3) is placed on the conveyor belt (53) and transported to the top of the accommodating groove (51) by the conveyor belt (53), and the top driving plate of the top cylinder (52) pushes out the bottom cavity plate (4) in the accommodating groove (51), and after the bottom cavity plate (4) cooperates and supports the bottom of the sand mold (3), the bottom cavity plate (4) is continuously lifted to make the sand mold (3) The bottom side of the mold (3) is separated from the conveyor belt (53) and the bottom side of the bottom cavity plate (4) is separated from the accommodating groove (51), and then the bottom cavity plate (4) and the sand mold (3) are prepared for the subsequent clamping of the bottom cavity plate (4) and the sand mold (3). At the end point, the hanger (14) places the bottom cavity plate (4) and the sand mold (3) above the accommodating groove (51), and the driving plate at the top of the top cylinder (52) is supported on the bottom side of the bottom cavity plate (4). After the hanger (14) releases the clamping, the top cylinder (52) supports the bottom cavity plate (4) to descend so that the bottom cavity plate (4) is placed in the accommodating groove (51), and the sand mold (3) is placed on the conveyor belts (53) on both sides.

6. A method for using the transfer device for printing sand molds for PU seat foaming molds according to claim 5, characterized in that: The steps are as follows: S1: At the starting point, the sand mold (3) is placed on the conveyor belt (53) and transported by the conveyor belt (53) to the top of the receiving tank (51), and the top driving plate of the top cylinder (52) pushes out the bottom cavity plate (4) in the receiving tank (51), and after the bottom cavity plate (4) cooperates and supports the bottom of the sand mold (3), the bottom cavity plate (4) is continuously lifted to make the bottom side of the sand mold (3) separate from the conveyor belt (53) and the bottom side of the bottom cavity plate (4) separate from the receiving tank (51); S2: A group of slings (14) is rotated into place above the accommodating groove (51), and the electric hoist (24) drives the second winding rope (25) to unwind, and then the overall height of the transfer frame (1) is driven to drop by driving the lower hanging block (23) and the outer frame (26) to drop, until the clamping body (141) drops to both sides of the sand mold (3), and the clamping screw (142) is started to rotate, so that the bottom end plug rods of the two groups of clamping bodies (141) are plugged into both sides of the bottom cavity plate (4), and the inner side of the clamping body (141) is tightly attached to the peripheral side wall of the sand mold (3) to complete the clamping operation of the sling (14), and then the electric hoist (24) drives the lower hanging block (23) and the outer frame (26) to drop again. The frame (26) and the transfer frame (1) rise to leave space for the driving motor 1 (27) to drive the rotating transfer frame (1), and after the driving motor 1 (27) drives the transfer frame (1) to rotate in the circumferential direction so that the next group of slings (14) in the circumferential direction is located above the accommodating groove (51), the lower lifting block (23), the outer frame (26) and the transfer frame (1) are controlled to descend again so that the sling (14) above the accommodating groove (51) can clamp the sand mold (3), and after the clamping is completed, the electric hoist (24) drives the lower lifting block (23), the outer frame (26) and the transfer frame (1) to rise again until all the slings (14) have completed the clamping; S3: After all the slings (14) have completed the clamping, the winding device at the end point is started to wind up the rope 1, and the winding device at the starting point is started to unwind the rope 1, and the hanger (2) can drive the transfer frame (1) to transfer to the end point along the aerial hanging rail; S4: At the end point, the driving motor 1 (27) drives the transfer frame (1) to rotate in the circumferential direction, so that a group of slings (14) clamp the bottom cavity plate (4) and the sand mold (3) and place them above the accommodating groove (51). The driving plate at the top of the top cylinder (52) rises and supports the bottom side of the bottom cavity plate (4). After the sling (14) releases the clamping, the top cylinder (52) supports the bottom cavity plate (4) to descend so that the bottom cavity plate (4) is placed in the accommodating groove (51), and the sand mold (3) is placed on the conveyor belts (53) on both sides of the transition platform (5) to complete the separation of the bottom cavity plate (4) and the sand mold (3). The sand mold (3) is output by the conveyor belt (53), and After the bottom cavity plate (4) is taken out, the driving motor 1 (27) drives the transfer frame (1) to rotate in the circumferential direction again, so that another set of slings (14) clamps the bottom cavity plate (4) and the sand mold (3) and places them above the receiving groove (51). The driving plate at the top of the top cylinder (52) rises again to support the bottom side of the bottom cavity plate (4). After the sling (14) releases the clamping, the top cylinder (52) supports the bottom cavity plate (4) to descend so that the bottom cavity plate (4) is placed in the receiving groove (51), and the sand mold (3) is placed on the conveyor belts (53) on both sides of the transition platform (5), until the separation of the bottom cavity plate (4) and the sand mold (3) in all slings (14) is completed.

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