A lost foam molding sand box

Abstract

The application discloses a lost foam casting sand box and belongs to the technical field of casting sand boxes. The lost foam casting sand box comprises a box body, a bottom plate hingedly connected to the bottom of the box body, a driving part, a support assembly and a sliding part. The telescopic end of the driving part is hingedly connected to the bottom plate to open or close the bottom plate. The support assembly is arranged between the two bottom plates and can slide in the vertical direction between the two bottom plates during the downward deflection of the bottom plate. The two ends of the support assembly are hingedly connected to the sliding part. The cooperation of the rotating shaft and the clamping block can lock or unlock the clamping block to the connecting piece, so that the support assembly can place the casting on the conveying unit during the downward deflection of the bottom plate and can be bounced apart again to support the casting during the upward deflection of the bottom plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casting sand box, in particular to a kind of lost foam casting sand box. BACKGROUND

[0002] The lost foam casting sand box is an indispensable key equipment in the lost foam casting process, which is usually composed of a box, an exhaust chamber, positioning (or clamping) blocks, and lifting or walking transport structures. The box is generally welded from steel plates and reinforced with channel steel or angle steel, and the cross-sectional shape can be square, rectangular or circular.

[0003] When the sand box is unloaded, the sand can be unloaded from the top of the sand box, which generally needs to be driven by a turnover device to deflect the sand box. Alternatively, the sand can be unloaded from the bottom of the sand box, which generally needs to be hoisted above the screen, and then the bottom plate is opened. However, during the unloading process, when the sand leaks out, the casting will fall by itself, lacking protection for the casting. For some castings with small structures, it may cause damage to related structures. In addition, the dropped casting is not convenient for transportation.

[0004] Therefore, it is necessary to provide a lost foam casting sand box to solve the above technical problems. SUMMARY

[0005] The present application aims to provide a lost foam casting sand box to solve the problem that the existing device lacks protection for the casting during the unloading process, and for some castings with small structures, it may cause damage to related structures, in addition, the dropped casting is not convenient for transportation.

[0006] Based on the above idea, the present application provides the following technical scheme: a lost foam casting sand box, comprising a box and a bottom plate hinged to the bottom of the box, further comprising;

[0007] A drive member is hinged to the bottom plate at the extension end to open or close the bottom plate.

[0008] A support assembly is provided between the two bottom plates, which can slide in the vertical direction between the two bottom plates during the downward deflection of the bottom plate.

[0009] A sliding member is provided on the top of the bottom plate, and both ends of the support assembly are hinged to the sliding member.

[0010] As a further scheme of the present application: the support assembly comprises a first support member, a second support member and a connecting member provided between the first support member and the second support member.

[0011] As a further scheme of the present application, the end of the second support is provided with a slot for inserting the connecting piece, and an elastic piece is arranged between the end of the slot and the connecting piece.

[0012] As a further scheme of the present application, the second support is provided with a clamping assembly matched with the connecting piece, the clamping assembly comprises a clamping block arranged in the slot, the top end of the clamping block is provided with a rotating shaft, the bottom end of the rotating shaft is inserted into a pre-set circular hole in the clamping block, a spiral groove is arranged on the circumferential surface of the circular hole, the two ends of the spiral groove are on the same straight line, a straight groove is arranged on the circumferential surface of the circular hole in the vertical direction to connect the two ends of the spiral groove, and a protrusion is arranged on the outer circumferential surface of the rotating shaft, which can slide along the spiral groove and the straight groove.

[0013] As a further scheme of the present application, the rotating shaft is provided with a connecting shaft, the rotating shaft is in transmission connection with the connecting shaft, the top of the connecting piece is provided with a groove, and the end of the connecting shaft located in the groove is provided with a driving gear through a one-way bearing.

[0014] As a further scheme of the present application, the initial position of the driving gear is in the middle of the rack.

[0015] As a further scheme of the present application, the sliding piece is in T-shaped structure, and the top of the bottom plate is provided with a sliding groove, and the sliding piece slides in the sliding groove.

[0016] As a further scheme of the present application, the bottom of the box body is provided with a conveying unit, and when the driving piece opens the bottom plate, the castings in the box body can fall to the top of the conveying unit.

[0017] As a further scheme of the present application, the conveying unit comprises side conveying units arranged on both sides of the bottom of the box body and a central conveying unit located between the side conveying units, and a channel is arranged between the side conveying units and the central conveying unit for the support assembly to pass through.

[0018] As a further scheme of the present application, the side conveying units and the central conveying unit are both roller conveyors.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] When the driving piece opens the bottom plate, the castings in the box body can fall to the top of the conveying unit, thereby facilitating the conveying of the castings. In actual use, a plurality of sand boxes can be arranged on the conveying path of the conveying unit. Compared with the mode of hoisting the sand boxes to the top of the screen for sand unloading, this scheme does not need to move the sand boxes, and can quickly complete the sand unloading operation and the conveying operation of the castings.

[0021] The end of the supporting assembly is limited by the inclined bottom plate, so that the speed of the supporting assembly moving downward along the vertical direction matches the opening speed of the bottom plate, therefore, by controlling the opening speed of the bottom plate, the casting can be slowly placed on the top of the conveying unit, so as to avoid the collision between the casting and the conveying unit.

[0022] The locking or unlocking of the connecting piece by the clamping block through the cooperation of the rotating shaft and the clamping block can realize the locking or unlocking of the connecting piece by the clamping block, so that the supporting assembly can be placed on the conveying unit during the downward deflection of the bottom plate, and can be re-opened to support the casting during the upward deflection of the bottom plate. BRIEF DESCRIPTION OF DRAWINGS

[0023] The application will be further described below in combination with the drawings and embodiments:

[0024] Figure 1 is the overall structure schematic diagram of the application;

[0025] Figure 2 is the schematic diagram of the opened bottom plate of the application;

[0026] Figure 3 is the box structure schematic diagram of the application;

[0027] Figure 4 is the schematic diagram of the supporting assembly located on the top of the bottom plate of the application;

[0028] Figure 5 is the connecting structure schematic diagram of the supporting assembly and the bottom plate of the application;

[0029] Figure 6 is the sectional view of the supporting assembly of the application;

[0030] Figure 7 is the enlarged structure schematic diagram of B of the application; Figure 6

[0031] Figure 8 is the cooperation schematic diagram of the rack and the driving gear of the application;

[0032] Figure 9 is the clamping block structure schematic diagram of the application;

[0033] Figure 10 is the enlarged structure schematic diagram of A of the application. Figure 2

[0034] ​​In the diagram: 1. Housing; 101. Base plate; 1011. Protrusion; 1012. Slide groove; 2. Drive component; 3. Side conveying unit; 4. Center conveying unit; 5. Support assembly; 501. First support component; 502. Second support component; 503. Connector; 5031. Groove; 6. Pin; 7. Base; 8. Sliding component; 9. Joint; 10. Elastic component; 11. Rack; 12. Drive gear; 13. Connecting shaft; 14. Rotating shaft; 1401. Protrusion; 15. Locking block; 1501. Spiral groove; 1502. Straight groove; 16. Mounting component. Detailed Implementation

[0035] like Figures 1-10 As shown, a lost foam casting sand box includes a box body 1 fixed to an external support and two bottom plates 101 disposed at the bottom of the box body 1 for sealing. Sealing strips are arranged on the side of the two bottom plates 101 near the box body 1 and on the opposite sides of the two bottom plates 101 to improve the sealing between the bottom plates 101 and the box body 1. The bottom plates 101 are hinged to the box body 1. In this design, the sand unloading operation is carried out by a bottom-opening door. Multiple sets of driving components 2 are arranged on the outside of the box body 1. The driving components 2 can be, for example, hydraulic cylinders or electric cylinders. The telescopic end of the driving component 2 is hinged to the bottom plate 101, while the tail end of the driving component 2 is hinged to the external support, which facilitates the rotation of the bottom plate 101 to open or seal the bottom of the box body 1.

[0036] During the sand unloading process, the box 1 can be lifted above the mesh and the bottom plate 101 can be opened by an external lifting device, so that the castings inside the box 1 fall onto the mesh, while the molding sand passes through the mesh and is collected. In this solution, a conveying unit is set at the bottom of the box 1. When the drive unit 2 opens the bottom plate 101, the castings inside the box 1 can fall to the top of the conveying unit, which is conducive to the conveying of the castings. Of course, in actual use, multiple sand boxes can be arranged on the conveying path of the conveying unit. Compared with the method of lifting the sand boxes to the top of the mesh for sand unloading, this solution does not require moving the sand boxes and can quickly complete the sand unloading operation and the casting conveying operation.

[0037] To ensure the casting rests stably on the conveying unit, a support assembly 5 is provided on the top of the base plate 101. During the downward tilting of the base plate 101, the support assembly 5 can slide vertically between the two base plates 101. Correspondingly, the conveying unit includes side conveying units 3 located on both sides of the bottom of the housing 1 and a central conveying unit 4 located between the two side conveying units 3. Figure 1As shown, a channel S is provided between the side conveying unit 3 and the central conveying unit 4 for the support assembly 5 to pass through. Specifically, when the support assembly 5 passes downward through the channel S, the casting located at the top of the support assembly 5 is retained at the top of the conveying unit. In summary, during the process of the driving component 2 opening the bottom plate 101, molding sand can leak out, and the casting descends and falls onto the top of the support assembly 5. As the two bottom plates 101 gradually open, the two ends of the support assembly 5 can slide downward along the opposite side of the two bottom plates 101. Figure 2 As can be seen, the inclined base plate 101 can limit the end of the support component 5, so that the speed at which the support component 5 moves downward in the vertical direction matches the opening speed of the base plate 101. Therefore, by controlling the opening speed of the base plate 101, the casting can be slowly placed on top of the conveying unit, thereby avoiding collision between the casting and the conveying unit.

[0038] Combination Figure 4 As shown, the support assembly 5 includes a first support member 501, a second support member 502, and a connector 503 disposed between the first support member 501 and the second support member 502. It should be noted that the first support member 501, the second support member 502, and the connector 503 are all steel plate structures. The ends of the first support member 501 and the second support member 502 that are opposite to each other are integrally formed with a joint 9. Figures 4-5 As shown, a sliding member 8 is slidably mounted on the top surface of the base plate 101 and hinged to the joint 9. During the downward deflection of the base plate 101, the sliding member 8 can slide downward along the groove 1012 opened on the top of the base plate 101, so that the support assembly 5 can move downward in the vertical direction. It should be noted that the sliding member 8 can be a T-shaped structure, and the cross-section of the groove 1012 is also T-shaped, thereby preventing the sliding member 8 from separating from the groove 1012.

[0039] Combination Figure 2 As shown, when the base plate 101 passes the side of the conveying unit, due to the large opening angle of the base plate 101, interference easily occurs between the base plate 101 and the support assembly 5 during the closing process. Therefore, in this solution, the first support member 501 and the second support member 502 are elastically fitted together. Specifically, the connecting member 503 is fixedly connected to the first support member 501, while the end of the second support member 502 has a slot for the connecting member 503 to be inserted. Figure 6As shown, the elastic member 10 is arranged between the notch end and the connecting piece 503, which can be a limit spring for example. Through this structure, during the closing process of the bottom plate 101, the pressure of the bottom plate 101 on the support assembly 5 enables the first support 501 and the second support 502 to approach each other, so that when the two bottom plates 101 are deflected upward to the condition that the support assembly 5 is capable of being spread, the first support 501 and the second support 502 can be spread apart and away from each other under the elastic force of the limit spring, thereby facilitating the next use.

[0040] Due to the elastic cooperation between the first support 501 and the second support 502, when the casting falls on the top of the support assembly 5 and during the falling process, the casting can tilt the support assembly 5, so that the casting and the conveying unit cannot be in stable contact. Based on this, the present scheme is provided with a clamping assembly cooperating with the connecting piece 503 in the second support 502, which is configured to prevent the connecting piece 503 from being further inserted into the notch during the downward deflection of the bottom plate 101, and after the two bottom plates 101 are opened to the limit angle and pull the first support 501 and the second support 502 away from each other, the connecting piece 503 can move freely in the notch.

[0041] Specifically, the clamping assembly includes a clamping block 15 arranged in the notch, with reference to Figure 7 As shown, one end of the clamping block 15 in the notch can abut against the end of the connecting piece 503, so as to avoid the further insertion of the connecting piece 503 into the notch;

[0042] The top end of the clamping block 15 is provided with a rotating shaft 14, the bottom end of which is inserted into the clamping block 15, and along with the rotation of the rotating shaft 14, the clamping block 15 can move along the axis direction of the rotating shaft 14 to realize the coincidence or misalignment between the clamping block 15 and the connecting piece 503, in combination with Figures 8-9 As shown, the top of the clamping block 15 is provided with a circular hole cooperating with the rotating shaft 14, and the circumferential surface of the circular hole is provided with a spiral groove 1501, which is arranged in a single circle and the two ends of the spiral groove 1501 are on the same straight line, from Figure 9As can be seen, the straight groove 1502 is arranged on the circumferential surface of the circular hole in the vertical direction to connect the two ends of the spiral groove 1501; the outer circumferential surface of the rotating shaft 14 is fixedly provided with a columnar protrusion 1401, the protrusion 1401 can circularly slide along the spiral groove 1501 and the straight groove 1502, specifically, when the protrusion 1401 slides along the spiral groove 1501, the clamping block 15 can be driven to move upward and be out of engagement with the connecting piece 503, so that the first supporting piece 501 and the second supporting piece 502 can approach or move away from each other, when the protrusion 1401 moves to the straight groove 1502, the clamping block 15 can fall and reengage with the connecting piece 503 to limit the connecting piece 503, thereby preventing the first supporting piece 501 and the second supporting piece 502 from approaching.

[0043] Further, one side of the rotating shaft 14 is provided with a connecting shaft 13, and the rotating shaft 14 is in transmission connection with the connecting shaft 13, the top of the connecting piece 503 is provided with a groove 5031, one end of the connecting shaft 13 located inside the groove 5031 is sleeved with a driving gear 12, the driving gear 12 is in meshing connection with a rack 11 fixed on the side of the groove 5031, and it should be noted that the driving gear 12 and the connecting shaft 13 are connected through a one-way bearing.

[0044] In actual use, when the driving member 2 opens the bottom plate 101, the sand leaks out from between the two bottom plates 101 and the casting can fall to the top of the support assembly 5. As the angle of the outward deflection of the bottom plate 101 gradually increases, the support assembly 5 can move downward in the vertical direction, and the stability of the support assembly 5 can be maintained by the pressure of the casting on the support assembly 5 to avoid the tilting of the support assembly 5. When the bottom plate 101 passes the conveying unit and the support assembly 5 passes the passage S downward, the casting on the top of the support assembly 5 can fall on the top of the conveying unit and be conveyed to the next station by the conveying unit. Then, the driving member 2 continues to drive the outward deflection of the bottom plate 101 to drive the first support 501 and the second support 502 to move away from each other. In this process, the rack 11 moves synchronously with the connecting member 503 and engages with the driving gear 12. The driving gear 12 can drive the connecting shaft 13 to rotate through the one-way bearing, and in turn drive the rotating shaft 14 to rotate synchronously. As described above, in the process of the rotation of the rotating shaft 14, the cooperation of the protrusion 1401 and the spiral groove 1501 can drive the clamping block 15 to move upward to make the clamping block 15 staggered with the connecting member 503, thereby facilitating the free movement of the connecting member 503 relative to the second support 502. Subsequently, when the driving member 2 drives the upward deflection of the bottom plate 101 to close, the first support 501 and the second support 502 can move close to each other under the pressure of the bottom plate 101 on the support assembly 5, and the connecting member 503 is further inserted into the slot. Since the driving gear 12 and the connecting shaft 13 are connected through the one-way bearing, in the process of the further insertion of the connecting member 503 into the slot, the driving gear 12 rotates but does not drive the connecting shaft 13 to rotate. As the bottom plate 101 gradually deflects upward to the horizontal state, the first support 501 and the second support 502 can move away from each other under the elastic force. In this process, the connecting member 503 moves outward in the slot, so that the rack 11 and the driving gear 12 engage again and drive the connecting shaft 13 to rotate, so that the protrusion 1401 can move along the spiral groove 1501 to the straight groove 1502. When the protrusion 1401 is aligned with the straight groove 1502, the clamping block 15 can fall off and reposition the connecting member 503.

[0045] It needs to be explained that the initial position of the driving gear 12 is in the middle of the rack 11, so in the process of pulling the support assembly 5 by the bottom plate 101 so that the front half of the rack 11 is engaged with the driving gear 12 and is out of engagement, the protruding block 1401 can rotate 180° relative to the clamping block 15, so that the protruding block 1401 is in the middle position of the spiral groove 1501, and the clamping block 15 can also be out of engagement with the connecting piece 503; subsequently, in the process of closing the bottom plate 101, the connecting piece 503 moves outward in the slot, so that the rear half of the rack 11 is engaged with the driving gear 12, and when the driving gear 12 is repositioned in the middle of the rack 11, the protruding block 1401 is moved to the straight groove 1502, so that the clamping block 15 can fall off.

[0046] In summary, the cooperation of the rotating shaft 14 and the clamping block 15 can realize the locking or unlocking of the clamping block 15 to the connecting piece 503, so that the support assembly 5 can place the casting on the conveying unit during the downward deflection of the bottom plate 101, and can be bounced back to support the casting during the upward deflection of the bottom plate 101.

[0047] The side conveying unit 3 and the center conveying unit 4 can be roller conveyors, which generally comprise a driving system composed of a motor, a chain, a sprocket, etc., so that the rollers rotate to convey the casting. The side conveying unit 3 and the center conveying unit 4 can be selected from existing technologies and will not be described here.

[0048] The bottom plate 101 is fixedly provided with a protruding portion 1011 on the side, which can be cylindrical or cuboid, and the telescopic end of the driving piece 2 is hinged to the protruding portion 1011 to drive the opening or closing of the bottom plate 101.

[0049] The box 1 is provided with a pin shaft 6 on both sides, which penetrates the bottom plate 101 and is rotatably connected thereto by a bearing. Specifically, the box 1 is fixedly provided with a base 7 on both sides, and the pin shaft 6 penetrates the base 7 and is fixedly or rotatably connected to the base 7. The bottom plate 101 is provided with an opening for exposing the pin shaft 6, and the base 7 is installed at the opening.

[0050] The joint 9 is fixedly provided with a circular shaft, which extends into the sliding piece 8 and is rotatably connected thereto.

[0051] The top end of the connecting shaft 13 and the rotating shaft 14 is fixedly provided with a driven gear, and the two driven gears are engaged to realize synchronous rotation between the connecting shaft 13 and the rotating shaft 14.

[0052] In actual use, the connecting shaft 13 and the rotating shaft 14 can be rotatably connected with the second support 502. Alternatively, an installation groove can be formed on the second support 502, and an installation piece 16 is assembled on the installation groove by screws. The connecting shaft 13 and the rotating shaft 14 are rotatably connected with the installation piece 16. The driven gear, the rotating shaft 14, the connecting shaft 13 and the clamping block 15 are assembled in the installation groove of the installation piece 16. Specifically, a rubber ring can be arranged between the rotating shaft 14 and the installation piece 16 to increase the friction between the rotating shaft 14 and the installation piece 16. When the convex block 1401 is located at the middle position of the spiral groove 1501, the friction between the rotating shaft 14 and the installation piece 16 can keep the rotating shaft 14 stable.

[0053] The above description is merely preferred embodiments of the present application, and is not intended to limit the scope of the present application. Any equivalent changes made in the light of the scope of the present application should be included in the scope of the present application.

Claims

1. A lost foam casting sand box, comprising a box body (1) fixed to an external support and two bottom plates (101) disposed at the bottom of the box body (1) for sealing thereon, wherein the bottom plates (101) are hinged to the box body (1), characterized in that, Also includes; A drive member (2), the telescopic end of which is hinged to the base plate (101) to open or close the base plate (101). Support component (5) is disposed on the top of the base plate (101). During the downward deflection of the base plate (101), the support component (5) can slide vertically between the two base plates (101). The sliding member (8) slides on the top of the base plate (101), and both ends of the support assembly (5) are hinged to the sliding member (8); The support assembly (5) includes a first support member (501), a second support member (502), and a connector (503) disposed between the first support member (501) and the second support member (502); The second support member (502) has a slot at its end for the connector (503) to be inserted, and an elastic member (10) is provided between the end of the slot and the connector (503). The second support member (502) is provided with a snap-fit ​​assembly that cooperates with the connector (503). The snap-fit ​​assembly includes a snap block (15) disposed in the slot. The top of the snap block (15) is provided with a rotating shaft (14). The bottom of the rotating shaft (14) is inserted into a pre-set circular hole on the snap block (15). A spiral groove (1501) is provided on the circumferential surface of the circular hole. The two ends of the spiral groove (1501) are on the same straight line. A straight groove (1502) is provided on the circumferential surface of the circular hole in the vertical direction to connect the two ends of the spiral groove (1501). A protrusion (1401) is provided on the outer circumferential surface of the rotating shaft (14). The protrusion (1401) can slide cyclically along the spiral groove (1501) and the straight groove (1502). A connecting shaft (13) is provided on one side of the rotating shaft (14), and the rotating shaft (14) is connected to the connecting shaft (13) in a transmission manner. A groove (5031) is provided on the top of the connecting member (503). One end of the connecting shaft (13) located inside the groove (5031) is fitted with a drive gear (12) through a one-way bearing. The drive gear (12) meshes with a rack (11) fixed on the side of the groove (5031). The upper part of the connecting shaft (13) and the upper part of the rotating shaft (14) are connected by a pair of... When the gears mesh, the drive gear (12) is initially positioned in the middle of the rack (11). During the process of the base plate (101) pulling the support assembly (5) to mesh and disengage the front half of the rack (11) with the drive gear (12), the protrusion (1401) can rotate 180° relative to the locking block (15). During the closing process of the base plate (101), when the drive gear (12) is back in the middle position of the rack (11), the protrusion (1401) moves to the straight groove (1502). The bottom of the box (1) is provided with a conveying unit, which includes side conveying units (3) located on both sides of the bottom of the box (1) and a central conveying unit (4) located between the two side conveying units (3). The side conveying units (3) and the central conveying unit (4) are provided with a channel for the support component (5) to pass through.

2. The lost foam casting sand box according to claim 1, characterized in that: The sliding member (8) has a T-shaped structure, and a groove (1012) is provided on the top of the base plate (101). The sliding member (8) slides in the groove (1012).

3. The lost foam casting sand box according to claim 2, characterized in that: Both the side conveying unit (3) and the center conveying unit (4) are roller conveyors.

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