Aluminum alloy casting core molding machine

Abstract

The application relates to the technical field of foundry molding, in particular to an aluminum alloy casting sand core molding machine; the machine comprises a base and a stand column fixedly connected to the rear position of the upper surface of the base; the upper end of the stand column is rotationally connected to a top base provided with an upper hydraulic cylinder; the lower end of the upper hydraulic cylinder is fixedly connected to a pressing plate; the front position of the upper surface of the base is fixedly connected to a support through a lower hydraulic cylinder; a plurality of electric push rods are embedded in the upper surface of the support; the upper surface of the support is provided with a mold plate provided with a mold sample and a rod groove; the mold plate drives a sand frame to move up and down in a hopper through control, so that a pressing strip can repeatedly beat the coated sand on the upper end of the sand frame, and the hopper assists the coated sand on the upper end of the sand frame to be supplemented, the coated sand in the sand frame is more compact and uniform in filling and pressing, the quality of the formed sand mold is improved, and compared with manual filling and pressing, the machine is more efficient and convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundry molding, in particular to an aluminum alloy casting sand core molding machine. BACKGROUND

[0002] In the production process of aluminum alloy castings, sand core molding is a key link to ensure the precision and quality of castings, and the quality of sand core forming directly depends on the filling and compaction tightness of coated sand. The current mainstream aluminum alloy casting sand core molding equipment in the industry still has many technical pain points in actual application, and it is difficult to meet the production needs of high efficiency and high quality.

[0003] The working process of the existing sand core molding machine is to first place the sand frame on the mold plate with a pattern, then shovel the coated sand into the sand frame, then control the mold plate to vibrate, then control the pressing plate to move downward to extrude the coated sand in the sand frame. The coated sand will form a sand mold with a mold cavity after being pressed, and finally the sand frame together with the sand mold inside can be taken out. The existing sand mold relies on single mechanical extrusion or simple vibration to realize molding. Since there are gaps between the coated sand particles, and the coated sand in the sand frame is not evenly distributed after being loaded, the single extrusion method is difficult to fully fill the gaps, and the vibration process is easy to cause the coated sand to accumulate locally and unevenly distributed, resulting in loose areas inside the formed sand mold. This structural defect will cause defects such as sand holes and pores during subsequent aluminum alloy casting pouring, seriously affecting the mechanical properties and appearance quality of the castings.

[0004] Therefore, after the coated sand is filled in the sand frame, the worker needs to repeatedly press the coated sand in the sand frame before the pressing plate is pressed down. However, manual pressing not only has the problems of uneven force and limited pressing range, but also is time-consuming and time-consuming. During the pressing process of the coated sand in the sand frame, the gaps are supplemented several times to ensure that the coated sand is fully filled. The repeated process makes the filling and pressing process of the coated sand in the sand frame more complicated and inconvenient. SUMMARY

[0005] In order to make up for the shortcomings of the prior art, the present application provides an aluminum alloy casting sand core molding machine. The present application controls the mold plate to drive the sand frame to move up and down inside the hopper, so that the pressing strip can repeatedly hit the coated sand on the upper end of the sand frame, and the hopper assists the coated sand on the upper end of the sand frame to supplement the material, so that the coated sand in the sand frame is more compact and uniform. The quality of the formed sand mold is improved, and compared with manual filling and pressing, it is more efficient and convenient.

[0006] The technical scheme adopted by the present application to solve its technical problems is: the aluminum alloy casting sand core molding machine comprises a base and a column fixedly connected to the rear upper surface of the base; the upper end of the column is rotatably connected to a top seat provided with an upper hydraulic cylinder; the lower end of the upper hydraulic cylinder is fixedly connected to a pressing plate; the front upper surface of the base is fixedly connected to a support through a lower hydraulic cylinder; the upper surface of the support is embedded with a plurality of electric push rods; the support is provided with a mold plate having a mold and a rod groove; the upper end of the electric push rod can pass through the rod groove; the upper surface of the mold plate is provided with a sand frame; the sand frame, the mold plate and the support are adapted in shape, and the outer side of the movable sealing sleeve is provided with a material frame; the lower end of the material frame is connected to the base, and the upper end is fixedly connected to an inverted quadrangular prism-shaped hopper; the inner side of the hopper is fixedly connected to an inner seat at the four corners; the front and rear corresponding inner seats are rotatably connected to a rotating rod through a torsion spring; the outer wall of the rotating rod is connected to a pressing strip.

[0007] Preferably, the pressing strips on the left and right rotating rods are arranged in the front and rear directions; the length of the pressing strip is greater than the width of the sand frame in the left and right directions.

[0008] Preferably, the pressing strip is sleeved on the outer side of the rotating rod through a pressing hole; the inner wall of the pressing hole is provided with an arc-shaped groove; the arc-shaped groove is movably connected with an arc-shaped block; the arc-shaped block is fixedly connected with the rotating rod; the arc length of the plurality of arc-shaped grooves is shortened by approaching the middle section of the rotating rod.

[0009] Preferably, the inner seat is provided with a rotating hole at the corresponding position of the end of the rotating rod; one end of the rotating rod is fixedly connected with a square block; the outer side of the square block is movably connected with an end sleeve; the inner side of the end sleeve is square groove-shaped, and the outer side is cylindrical; the end sleeve is rotatably connected with the corresponding rotating hole through a torsion spring; the arc-shaped outer wall of the end of the rotating rod away from the square block is fixedly connected with a corrugated block; the inner wall of the rotating hole is provided with a ring-shaped corrugated groove corresponding to the corrugated block; the corrugated block is movably connected in the ring-shaped corrugated groove.

[0010] Preferably, the distance between the adjacent pressing strips on the rotating rod is greater than the width of the pressing strip in the front and rear directions; the upper end of the pressing strip is triangular.

[0011] Preferably, the upper surface and the side wall of the mold plate are continuously provided with an L-shaped groove; a Z-shaped block is slidably connected in the L-shaped groove; the first spring is connected between the side of the Z-shaped block close to the center of the mold plate and the inner wall of the L-shaped groove; the lower end of the Z-shaped block is outwardly and downwardly inclinedly provided with a guide surface.

[0012] Preferably, a rotating rod is arranged between the left and right corresponding inner seats; a plurality of turning plates are fixedly connected to the outer wall of the rotating rod along the axial direction; the end of the rotating rod is fixedly connected with a motor.

[0013] Preferably, two said motors are fixedly connected with the air cylinders at a distance from each other; and two said air cylinders are fixedly connected with the hopper.

[0014] Preferably, the lower surface of the material frame is provided with threaded holes at corresponding positions of the upper surface of the base; the upper and lower threaded holes are threadedly connected with a screw rod; and the middle section of the screw rod is fixedly connected with a hexagonal block.

[0015] The beneficial effects of the present application are as follows:

[0016] 1. The present application drives the sand frame to move up and down inside the hopper through the control of the template, so that the pressing strip can repeatedly hit the coated sand on the upper end of the sand frame, and the coated sand on the upper end of the sand frame is supplemented by the hopper, so that the coated sand in the sand frame is filled and pressed more tightly and uniformly, and the quality of the formed sand mold is improved, which is more efficient and convenient compared with manual filling and pressing.

[0017] 2. The pressing strip closer to the rotating rod hits the sand frame first, and the pressing strip farther away from the rotating rod delays hitting the sand frame, and the coated sand piled up in the middle position of the sand frame moves to the front and rear sides under the hitting, so that the coated sand on the top of the sand frame is sequentially compacted and spread out, improving the uniformity of sand filling in the sand frame.

[0018] 3. In the process of the corrugated block fluctuating along the annular corrugated groove, the corrugated block fluctuates back and forth while rotating with the rotating rod, and the rotating rod drives the plurality of pressing strips to fluctuate back and forth, and the pressing strips flip down to hit the coated sand on the top of the sand frame, and the coated sand on the top of the sand frame also fluctuates back and forth in the process of hitting and extruding, thereby further spreading out the coated sand on the top of the sand frame. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below in conjunction with the drawings and embodiments.

[0020] Figure 1 is a perspective view of the present application;

[0021] Figure 2 is Figure 1 an enlarged view of A in FIG. 1;

[0022] Figure 3 is Figure 1 a structural view of the inside of the hopper;

[0023] Figure 4 is a perspective view of the support, template and sand frame in the present application;

[0024] Figure 5 is Figure 1 a sectional view of FIG. 1;

[0025] Figure 6 is Figure 5Enlarged view at B;

[0026] Figure 7 is the perspective view of the support and the mold plate in the present application;

[0027] Figure 8 is Figure 7 Enlarged view at C;

[0028] Figure 9 is the perspective view of the rotating rod and the pressing bar in the present application;

[0029] Figure 10 is the position view of the arc-shaped groove in the present application;

[0030] Figure 11 is the sectional view of the rotating hole in the present application;

[0031] Figure 12 is Figure 11 the partial structure view of the rotating hole;

[0032] Figure 13 is the shape schematic view of the annular corrugated groove in the present application.

[0033] In the figure: base 1, lower hydraulic cylinder 11, support 12, electric push rod 13, vertical column 2, upper hydraulic cylinder 21, top base 22, pressing plate 23, mold plate 3, mold 31, rod groove 32, L-shaped groove 33, Z-shaped block 34, first spring 35, guide surface 36, sand frame 4, clamping groove 41, material frame 5, hopper 51, threaded hole 52, screw rod 53, hexagonal block 54, inner base 6, torsional spring 61, rotating hole 62, annular corrugated groove 63, rotating rod 7, pressing bar 71, pressing hole 72, arc-shaped groove 73, arc-shaped block 74, square block 75, end sleeve 76, corrugated block 77, turning rod 8, turning plate 81, motor 82, air cylinder 83. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0035] As Figures 1 to 13 shown, the present application includes the following embodiments:

[0036] Embodiment 1: an aluminum alloy casting sand core molding machine, comprising a base 1 and a column 2 fixedly connected to the rear upper surface of the base 1; the upper end of the column 2 is rotatably connected to a top seat 22 with an upper hydraulic cylinder 21; the lower end of the upper hydraulic cylinder 21 is fixedly connected to a pressing plate 23; the front upper surface of the base 1 is fixedly connected to a support 12 through a lower hydraulic cylinder 11; a plurality of electric push rods 13 are embedded in the upper surface of the support 12; the support 12 is installed with a mold plate 3 with a mold 31 and a rod groove 32; the upper end of the electric push rod 13 can pass through the rod groove 32; the upper surface of the mold plate 3 is installed with a sand frame 4; the sand frame 4, the mold plate 3 and the support 12 are adapted in shape, and the outer side of the movable sealing sleeve is provided with a material frame 5; the lower end of the material frame 5 is connected with the base 1, and the upper end is fixedly connected with an inverted quadrangular prism-shaped hopper 51; the inner side of the hopper 51 is fixedly connected with an inner seat 6; the front and rear two corresponding inner seats 6 are rotatably connected with a rotating rod 7 through a torsion spring 61; the outer wall of the rotating rod 7 is connected with a pressing strip 71.

[0037] The lower hydraulic cylinder 11 pushes the support 12 to move upwards, the support 12 moves upwards away from the inner side of the material frame 5, the material frame 5 moves upwards, the mold plate 3 moves upwards synchronously, the mold 31 moves upwards, the mold plate 3 is extruded by the pressing strips 71 on both sides, so that the pressing strips 71 are extruded to drive the rotating rod 7 to overcome the torsion spring 61 to rotate, the pressing strips 71 on both sides are turned upwards to a vertical state, the energy storage process of the torsion spring 61 is completed, the mold plate 3 continues to move upwards and stops moving when the mold plate 3 moves higher than the upper end of the hopper 51, then the sand frame 4 is installed on the upper surface of the mold plate 3, the pressing strips 71 on both sides are located on the left and right sides of the mold plate 3 and do not interfere with the installation of the sand frame 4, the sand frame 4 is shaped as a square frame shape with a through hole from top to bottom, the sand frame 4 covers the mold 31 on the upper surface of the mold plate 3, during the installation of the sand frame 4 on the mold plate 3, the lower end of the support 12 does not come out of contact with the material frame 5, so the lower end of the hopper 51 is always in a closed state, then the coated sand is poured into the sand frame 4, and the amount of coated sand is as much as possible to be added at one time to prepare for subsequent filling and pressing, the excess coated sand at the upper end of the sand frame 4 falls into the hopper 51 for collection, avoiding waste and preparing for subsequent sand supplement.

[0038] Then the hydraulic cylinder 11 is controlled to shorten and drive the support 12 to move down, the support 12 will drive the mold plate 3 and the sand frame 4 to move down synchronously, the height of the upper end of the sand frame 4 will gradually be lower than the rotating rod 7 and the end of the pressing strip 71 connected with the rotating rod 7, the torsion spring 61 will drive the rotating rod 7 to rotate, the rotating rod 7 will drive the pressing strip 71 to flip down during the rotation, the pressing strip 71 will hit the coated sand accumulated on the upper end of the sand frame 4 during the flipping, the coated sand will move to the inside of the sand frame 4 during the hitting, and some coated sand will also spread around during the hitting, then the support 12 will drive the mold plate 3 and the sand frame 4 to move up, the upper end of the sand frame 4 will press the pressing strips 71 on the left and right sides again, so that the pressing strips 71 are pressed to flip up to be vertical again, then the support 12 will drive the mold plate 3 and the sand frame 4 to move down again, the coated sand in the hopper 51 will gather to the top of the sand frame 4, the pressing strip 71 will hit the coated sand on the upper end of the sand frame 4 again, the coated sand on the upper end of the sand frame 4 will be more compact and evenly spread during the repeated hitting by the pressing strip 71, the coated sand on the upper end of the sand frame 4 will be hit into the sand frame 4, after the space on the upper end of the sand frame 4 is emptied, the coated sand inside the hopper 51 will gather to the upper end of the sand frame 4 again under the action of gravity, the coated sand on the upper end of the sand frame 4 will be hit and pressed into the sand frame 4 by the pressing strip 71, the coated sand in the sand frame 4 will be evenly spread and compacted during the repeated up-and-down movement of the sand frame 4, the gap between the coated sand in the sand frame 4 will be gradually filled, and the process of manually pressing the coated sand and repeatedly feeding is freed.

[0039] After the film-coated sand in the sand frame 4 is filled and pressed, the sand frame 4 is controlled to move up again to pass the rotating rod 7, the pressing strip 71 is pressed into a vertical state again, then the top base 22 is driven to rotate at one end by the vertical column 2, the other end of the top base 22 is driven to rotate around the vertical column 2, the top base 22 drives the upper hydraulic cylinder 21 and the pressing plate 23 to rotate by 90 degrees, the height of the pressing plate 23 is higher than the height of the pressing strip 71 in the vertical state, so the rotation of the pressing plate 23 does not cause interference, after the pressing plate 23 rotates to the top of the sand frame 4, the upper hydraulic cylinder 21 is elongated, the upper hydraulic cylinder 21 drives the pressing plate 23 to move down, the cross section of the pressing plate 23 is adapted to the cross section in the sand frame 4, so the pressing plate 23 moves down to fall on the film-coated sand at the upper end of the sand frame 4, the film-coated sand in the sand frame 4 is pressed into a blocky sand mold after being pressed, then the mold plate 3 drives the sand frame 4 and the sand mold in the sand frame 4 to shake once, to prepare for the separation of the sand mold and the mold 31, then the upper hydraulic cylinder 21 is shortened to drive the pressing plate 23 to move up, after the height of the pressing plate 23 is higher than the height of the pressing strip 71, the top base 22 is rotated to drive the upper hydraulic cylinder 21 and the pressing plate 23 to move away from the top of the sand frame 4, then after the lower hydraulic cylinder 11 is controlled to move up to the limit position, the electric push rod 13 is controlled to be elongated, the electric push rod 13 is elongated to push the sand frame 4 to move up, the sand mold inside the sand frame 4 is separated from the mold 31 by moving up, finally the sand frame 4 is lifted to be unloaded, then a new sand frame 4 is replaced to make the next sand mold, and the process is repeated.

[0040] The sand frame 4 is driven to move up and down in the hopper 51 by the mold plate 3, so that the pressing strip 71 can repeatedly hit the film-coated sand at the upper end of the sand frame 4, and the hopper 51 assists the film-coated sand at the upper end of the sand frame 4 to be filled, so that the film-coated sand in the sand frame 4 is filled and pressed more tightly and uniformly, and the quality of the formed sand mold is improved, which is more efficient and convenient compared with manual filling and pressing.

[0041] In the embodiment 2, the pressing strips 71 on the left and right rotating rods 7 are arranged in the front and back directions; the length of the pressing strip 71 is greater than the width of the sand frame 4 in the left and right directions.

[0042] Since the pressing strips 71 on the left and right rotating rods 7 are staggered in the front and back directions, when the upper end of the sand frame 4 is lower than the rotating rod 7 in the vertical direction, the rotating rod 7 drives the pressing strip 71 to flip downward under the action of the torsional spring 61, the pressing strips 71 on the two rotating rods 7 flip toward opposite positions, and the pressing strips 71 on the left and right sides are staggered during the flipping and pressing process, so as to avoid collision and interference, ensure the smooth pressing of the pressing strip 71, and improve the range of the pressing strip 71 hitting the film-coated sand on the sand frame 4 after flipping, since the length of the pressing strip 71 is greater than the width of the sand frame 4 in the left and right directions.

[0043] The pressing strip 71 is sleeved outside the rotating rod 7 through the pressing hole 72; the inner wall of the pressing hole 72 is provided with an arc-shaped groove 73; the arc-shaped block 74 is movably connected in the arc-shaped groove 73; the arc-shaped block 74 is fixedly connected with the rotating rod 7; the arc length of the plurality of arc-shaped grooves 73 is shortened by being arranged close to the middle section of the rotating rod 7.

[0044] The arc length of the arc-shaped groove 73 close to the middle position of the rotating rod 7 is smaller, so that the arc-shaped block 74 close to the middle position of the rotating rod 7 has a smaller movable range in the corresponding arc-shaped groove 73. When the upper end of the sand frame 4 is lower than the rotating rod 7 in the vertical direction, the rotating rod 7 is driven to rotate by the torsional spring 61, and the rotating rod 7 drives the plurality of arc-shaped blocks 74 to rotate synchronously. The arc-shaped block 74 close to the middle position of the rotating rod 7 drives the pressing strip 71 to press down first, and the arc-shaped block 74 far away from the middle position of the rotating rod 7 drives the pressing strip 71 to press down later. Specifically, it can be understood as inertia. The pressing strip 71 close to the rotating rod 7 first hits the sand frame 4, and the pressing strip 71 far away from the rotating rod 7 delays hitting the sand frame 4. The coated sand piled up in the middle position of the sand frame 4 is spread to the front and rear sides by the hitting, so that the coated sand on the top of the sand frame 4 is compacted and spread in turn, improving the uniformity of sand filling of the sand frame 4. The plurality of pressing strips 71 finally rest on the top of the sand frame 4, ensuring that the pressing angle of the pressing strip 71 is consistent.

[0045] In the embodiment, the inner seat 6 and the corresponding position of the end of the rotating rod 7 are provided with a rotating hole 62; one end of the rotating rod 7 is fixedly connected with a square block 75; the outer side of the square block 75 is movably connected with an end sleeve 76; the inner side of the end sleeve 76 is a square groove, and the outer side is a cylindrical shape; the end sleeve 76 is rotatably connected with the corresponding rotating hole 62 through the torsional spring 61; the arc-shaped outer wall of the end of the rotating rod 7 away from the square block 75 is fixedly connected with a corrugated block 77; the inner wall of the rotating hole 62 is provided with a ring-shaped corrugated groove 63 corresponding to the corrugated block 77; the corrugated block 77 is movably connected in the ring-shaped corrugated groove 63.

[0046] In the embodiment, the distance between the adjacent pressing strips 71 on the rotating rod 7 is greater than the width of the pressing strip 71 in the front-rear direction; the upper end of the pressing strip 71 is triangularly arranged.

[0047] When the upper end of the sand frame 4 is lower than the rotating rod 7, the torsion spring 61 drives the end sleeve 76 to rotate, the end sleeve 76 drives the square block 75 on the inner side to rotate, the square block 75 drives the rotating rod 7 to rotate in the process of rotating, the rotating rod 7 drives the corrugated block 77 to move along the annular corrugated groove 63 in the process of rotating, the annular corrugated groove 63 fluctuates back and forth along the circumference to the front side and the rear side, so that the corrugated block 77 fluctuates back and forth while rotating with the rotating rod 7 in the process of fluctuating along the annular corrugated groove 63, the rotating rod 7 fluctuates back and forth in the process, which drives the plurality of pressing strips 71 to fluctuate back and forth, the pressing strips 71 flip down to beat the coated sand on the top of the sand frame 4, and the coated sand on the top of the sand frame 4 also fluctuates back and forth in the process of beating and extruding, so as to further spread the coated sand on the top of the sand frame 4.

[0048] In addition, since the distance between the adjacent two pressing strips 71 on the rotating rod 7 is greater than the width of the pressing strip 71 on the front and rear sides, the pressing strips 71 on the left and right sides do not interfere with each other in the process of crossing, and the upper end of the pressing strip 71 is triangular, so that the pressing strip 71 can smoothly cross under the guidance of the triangular end; the pressing strip 71 also fluctuates back and forth in the process of flipping up and returning, and the residual coated sand on the pressing strip 71 falls off under the fluctuation.

[0049] In embodiment 5, the upper surface and the side wall of the mold plate 3 are provided with an L-shaped groove 33 in communication; the Z-shaped block 34 is slidably connected in the L-shaped groove 33; the Z-shaped block 34 is connected between the inner wall of the L-shaped groove 33 and the side close to the center of the mold plate 3 through the first spring 35; the lower surface of the sand frame 4 is provided with a reverse L-shaped clamping groove 41 corresponding to the L-shaped groove 33; the upper end of the Z-shaped block 34 can be clamped into the clamping groove 41; and the lower end of the Z-shaped block 34 is outwardly and downwardly inclinedly provided with a guide surface 36.

[0050] After the mold plate 3 is moved and exposed from the inside of the material frame 5, the L-shaped groove 33 on the mold plate 3 exposes the lateral one end, the Z-shaped block 34 exposes the lower one end, then the sand frame 4 is placed on the upper surface of the mold plate 3 under the condition that the clamping groove 41 of the sand frame 4 is aligned with the upper one end of the Z-shaped block 34, then the mold plate 3 is controlled to move downward, after the mold plate 3 moves downward, the lateral one end of the L-shaped groove 33 enters the inside range of the material frame 5, the guide surface 36 of the lower one end of the Z-shaped block 34 is extruded to drive the Z-shaped block 34 to overcome the first spring 35 and slide along the L-shaped groove 33, the upper one end of the Z-shaped block 34 slides in the clamping groove 41 and is clamped, the mold plate and the sand frame 4 are locked, so that the sand frame 4 does not form a gap from the mold plate 3 during the up-down movement of the upper one end of the sand frame 4 with the mold plate 3 as long as the mold plate 3 is kept inside the material frame 5, the stability of the sand frame 4 moving with the mold plate 3 is ensured, and the mold plate 3 and the sand frame 4 are unlocked by controlling the mold plate 3 to move away from the inside of the material frame 5, the first spring 35 pushes the Z-shaped block 34 to slide along the L-shaped groove 33, the upper one end of the Z-shaped block 34 slides along the clamping groove 41 to be unlocked, the sand frame 4 and the mold plate 3 are unlocked, so that the sand frame 4 can be smoothly moved up and removed.

[0051] In embodiment 6, the two corresponding inner seats 6 are provided with a turning rod 8; the outer wall of the turning rod 8 is fixedly connected with a plurality of turning plates 81 along the axial direction; and the end of the turning rod 8 is fixedly connected with a motor 82.

[0052] In this embodiment, the two motors 82 are fixedly connected with air cylinders 83 away from each other on one side; and the two air cylinders 83 are fixedly connected with the hopper 51.

[0053] When the sand frame 4 moves downward with the mold plate 3, the pressing strip 71 keeps a vertical state under the condition that the upper one end of the sand frame 4 is not lower than the end connected with the rotating rod 7, the motor 82 rotates to drive the turning rod 8 to rotate, the turning plate 81 rotates in the process of the turning rod 8 rotating, the coated sand in the hopper 51 is turned toward the top of the sand frame 4 in the process of the turning plate 81 rotating, so that the top of the sand frame 4 is supplemented with the coated sand, after the upper one end of the sand frame 4 is lower than the end connected with the rotating rod 7, the motor 82 stops working, the pressing strip 71 is turned to pat and extrude the coated sand on the top of the sand frame 4, and the two electric push rods 13 are extended and retracted back and forth, so that the turning rod 8 can move back and forth along the axial direction, and the turning plate 81 drives the coated sand in the lower position of the hopper 51 to be stirred in the process of the turning rod 8 moving back and forth, so that the coated sand is more evenly distributed in the left-right direction, and preparation is made for the next turning plate 81 feeding.

[0054] In embodiment 7, the lower surface of the material frame 5 is provided with a threaded hole 52 at a position corresponding to the upper surface of the base 1; the upper and lower threaded holes 52 are threadedly connected with a screw rod 53; and the middle segment of the screw rod 53 is fixedly connected with a hexagonal block 54.

[0055] When the hexagonal block 54 is rotated with a wrench, the screw 53 will rotate. The upper and lower ends of the screw 53 are threaded. The upper end of the screw 53 is connected to the threaded hole 52 on the material frame 5, and the lower end of the screw 53 is connected to the threaded hole 52 in the base 1. Rotating the hexagonal block 54 can move the material frame 5 up or down. The hopper 51 will move with the material frame 5, thereby changing the height of the material frame 5 and the hopper 51, so that the material frame 5 and the hopper 51 can meet the needs of sand frames 4 of different heights, thus improving the applicability of the sand core molding machine.

[0056] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An aluminum alloy casting sand core molding machine, comprising a base and a column fixedly connected to the rear of the upper surface of the base; the upper end of the column is rotatably connected to a top seat with an upper hydraulic cylinder; the lower end of the upper hydraulic cylinder is fixedly connected to a pressing plate; the front of the upper surface of the base is fixedly connected to a support through a lower hydraulic cylinder; the upper surface of the support is embedded with a plurality of electric push rods; the support is installed with a mold plate with a mold and a rod slot; the upper end of the electric push rod can pass through the rod slot; the upper surface of the mold plate is installed with a sand frame; characterized in that: The sand frame, the mold plate and the support are matched in shape, and the outer movable sealing sleeve is provided with a material frame; the lower end of the material frame is connected with the base, and the upper end is fixedly connected with an inverted quadrangular prism-shaped hopper; the inner side of the hopper is fixedly connected with inner seats at four corners; the front and rear corresponding inner seats are rotatably connected with rotating rods through torsional springs; and the outer wall of the rotating rod is connected with pressing strips; The pressing strips on the left and right rotating rods are staggered in the front and rear directions; and the length of the pressing strip is greater than the width of the sand frame in the left and right directions; The pressing strip is sleeved on the outer side of the rotating rod through a pressing hole; the inner wall of the pressing hole is provided with an arc-shaped groove; the arc-shaped groove is movably connected with an arc-shaped block; the arc-shaped block is fixedly connected with the rotating rod; and the arc length of the arc-shaped groove is shortened when approaching the middle section of the rotating rod; The inner seat is provided with a rotating hole at the corresponding position of the end of the rotating rod; one end of the rotating rod is fixedly connected with a square block; the outer side of the square block is movably connected with an end sleeve; the inner side of the end sleeve is square groove-shaped, and the outer side is cylindrical; the end sleeve is rotatably connected with the corresponding rotating hole through a torsional spring; the arc-shaped outer wall of the end of the rotating rod away from the square block is fixedly connected with a corrugated block; the inner wall of the rotating hole is provided with a ring-shaped corrugated groove corresponding to the corrugated block; and the corrugated block is movably connected in the ring-shaped corrugated groove.

2. An aluminum alloy casting core molding machine according to claim 1, characterized by: The distance between the adjacent pressing strips on the rotating rod is greater than the width of the pressing strip in the front and rear directions; and the upper end of the pressing strip is triangular.

3. An aluminum alloy sand core molding machine according to claim 1, characterized by: The upper surface and the side wall of the mold plate are continuously provided with L-shaped grooves; a Z-shaped block is slidably connected in the L-shaped groove; the Z-shaped block is connected between the inner wall of the L-shaped groove and the side close to the center of the mold plate through a first spring; the lower surface of the sand frame is provided with a reverse L-shaped clamping groove corresponding to the L-shaped groove; the upper end of the Z-shaped block can be clamped into the clamping groove; and the lower end of the Z-shaped block is outwardly and downwardly inclinedly provided with a guide surface.

4. An aluminum alloy sand core molding machine according to claim 1, characterized by: A turning rod is arranged between the left and right corresponding inner seats; the outer wall of the turning rod is fixedly connected with a plurality of turning plates along the axial direction; and the end of the turning rod is fixedly connected with a motor.

5. An aluminum alloy sand core molding machine according to claim 4, characterized in that: The mutually away sides of the two motors are fixedly connected with air cylinders; and the air cylinders are fixedly connected with the hopper.

6. An aluminum alloy sand core molding machine according to claim 1, characterized by: Threaded holes are arranged at the corresponding positions of the lower surface of the material frame and the upper surface of the base; and a screw rod is threadedly connected with the upper and lower threaded holes; and a hexagonal block is fixedly connected with the middle section of the screw rod.

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