Gravity casting device

Abstract

The application discloses a gravity casting device, relates to the technical field of gravity casting, and comprises a rack, the rack is provided with a bearing assembly for mounting a mold, the mold comprises an upper mold and a lower mold, the upper mold and the lower mold are combined to form a mold cavity, an outer wall of the lower mold is provided with a liquid inlet groove, and the liquid inlet groove is communicated with the mold cavity; the bearing assembly comprises a bearing seat hinged to the rack, a mounting seat slidably connected to the bearing seat, and a hydraulic cylinder one for driving the mounting seat to be close to the bearing seat, the rack is further provided with a hydraulic cylinder two, and the hydraulic cylinder two is used for driving the bearing assembly to overturn so that the mold is overturned to guide metal liquid in the liquid inlet groove into the mold cavity. Through driving the bearing assembly to overturn by the hydraulic cylinder two, the outer side wall of the liquid inlet groove is arranged, the situation that the design requirement of the liquid inlet hole of the upper mold is relatively complex due to the existence of the mounting seat is improved, and actual casting operation is more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gravity casting, more particularly, it relates to a gravity casting device. BACKGROUND

[0002] Gravity casting refers to a process in which molten metal is poured under the action of gravity. The aluminum castings of an engine need to use the method of gravity casting, such as engine water pipes and other blanks.

[0003] For example, a Chinese invention patent with the patent publication number CN104668542A discloses a gravity casting machine, which comprises a support fixed on a base, a core-pulling oil cylinder fixed on the base, a mold platform fixed on the upper end of the piston rod of the core-pulling oil cylinder, fixed mold plates symmetrically arranged on the left and right sides of the upper end of the support, guide sleeves respectively arranged at the four corners of the fixed mold plates, guide columns slidingly matched with the guide sleeves, the rear ends of the guide columns fixedly connected with connecting plates, the front ends of the guide columns fixedly connected with movable mold plates, a mold closing oil cylinder fixed on the fixed mold plates, the piston rod of the mold closing oil cylinder fixedly connected with the movable mold plates, vertical columns respectively arranged at the four corners of the support, mounting seats fixedly connected with the top ends of the vertical columns, and lifting oil cylinders arranged on the mounting seats corresponding to the positions directly above the mold platforms.

[0004] The gravity casting device needs molten metal to flow into a mold cavity under the action of gravity for molding. When the gravity casting machine is used, based on the requirement of supplementing molten metal, a liquid inlet hole needs to be arranged at the top end of the upper mold for guiding the molten metal to flow in. However, based on the existence of the mounting seat, the position of the liquid inlet hole needs to be staggered with the mounting seat, and the design of the upper mold is relatively complex, which needs to be improved. SUMMARY

[0005] In order to improve the situation that the existence of the mounting seat leads to the requirement of complex design of the liquid inlet hole of the upper mold, the present application provides a gravity casting device.

[0006] The present application provides a gravity casting device, which adopts the following technical scheme:

[0007] The gravity casting device comprises a rack, a bearing assembly for mounting a mold is arranged on the rack, the mold comprises an upper mold and a lower mold, the upper mold and the lower mold are combined to form a mold cavity, an outer wall of the lower mold is provided with a liquid inlet groove, and the liquid inlet groove is communicated with the mold cavity; the bearing assembly comprises a mounting seat slidingly connected with a bearing seat of the rack and a hydraulic cylinder one driving the mounting seat to move close to the bearing seat, and the rack is further provided with a hydraulic cylinder two driving the bearing assembly to overturn so that the mold is overturned to guide the molten metal in the liquid inlet groove into the mold cavity.

[0008] Through the technical scheme, the bearing assembly is hinged and the hydraulic cylinder two drives the bearing assembly to overturn, in actual use, first, the upper die is installed on the mounting seat, the lower die is installed on the bearing seat, when the hydraulic cylinder one drives the mounting seat to move downward, the upper die and the lower die are combined, the liquid inlet groove protrudes from the outer wall of the die, at this time, the operator pours the metal liquid into the liquid inlet groove, then the hydraulic cylinder two drives the bearing assembly to overturn so that the liquid inlet groove is located above the cavity, in the overturning process, the metal liquid in the liquid inlet groove pours into the cavity, when the metal liquid is completely filled into the cavity, after the metal liquid is solidified, the hydraulic cylinder two drives the bearing assembly to overturn, then the hydraulic cylinder one drives the mounting seat to move away from the bearing seat so that the upper die and the lower die are separated, and the operator can take out the workpiece from the cavity area of the lower die. Through the hydraulic cylinder two driving the bearing assembly to overturn, the outer side wall of the liquid inlet groove is provided, the situation that the design requirement of the liquid inlet hole of the upper die is relatively complex due to the existence of the mounting seat is improved, and the actual casting operation is more convenient.

[0009] Optionally, the rack is provided with a limiting portion, and the limiting portion is arranged to be abutted by the bearing assembly so that the liquid inlet groove is located directly above the cavity.

[0010] Through the technical scheme, the limiting portion is arranged, the overturning amount of the bearing assembly is limited by the limiting portion, and actual use is more convenient.

[0011] Optionally, the rack is provided with an abutting portion, and the bearing seat is provided with an abutting block, when the abutting block abuts against the abutting portion, the upper die is located directly above the lower die.

[0012] Through the technical scheme, the abutting portion and the abutting block are arranged, when the abutting portion abuts against the abutting block, the upper die is located directly above the lower die, and the overturning positioning of the bearing assembly is more accurate.

[0013] Optionally, the bearing seat is slidably connected to a ejector pin, a sliding direction of the ejector pin is parallel to a sliding direction of the mounting seat, and the bearing seat is further provided with a driving member, and the driving member is used to drive the ejector pin to penetrate into the cavity of the lower die to eject the workpiece toward the upper die.

[0014] Through the technical scheme, the workpiece in the cavity of the lower die can be ejected by the stator, and the ejection operation of the workpiece is more convenient.

[0015] Optionally, the ejector pin is provided with a plurality of ejector pins, and a plate body is further arranged, each ejector pin is fixed to the plate body, and the driving member drives the plate body to move to drive the ejector pin to move.

[0016] Through the technical scheme, the plate body connects the plurality of ejector pins, the movement of each ejector pin is more synchronous, and the ejection is more convenient.

[0017] Optionally, the driving member comprises a driving oil cylinder arranged on the bearing seat, a driving plate arranged on the driving oil cylinder piston rod, and a plurality of driving rods arranged on the driving plate, each of the driving rods being arranged to abut against the plate body.

[0018] Through the above technical solution, the driving oil cylinder drives the driving plate to move and drive the driving rods to move, the driving rods abut against the plate body, so that multiple points simultaneously apply force to the plate body, and the operation of the plate body driving the ejector pin to eject the workpiece from the lower mold is more stable.

[0019] Optionally, the plate body is further provided with a reset rod, the reset rod slidingly passes through the upper side of the lower mold, the position of the reset rod is staggered with the position of the cavity, when the upper mold and the lower mold are closed, the upper mold presses the reset rod so that the ejector pin is flush with the inner wall of the lower mold cavity.

[0020] Through the above technical solution, the reset rod is arranged, when the mold is closed, the reset rod is pressed to the upper end of the reset rod flush with the upper end surface of the lower mold by the upper mold, at this time the upper end of the ejector pin is flush with the inner wall of the lower mold cavity, so that the ejector pin does not protrude from the inner wall of the cavity, and the overall molding is more stable.

[0021] Optionally, the driving member is a gas cylinder, and the piston rod of the gas cylinder is used to push the plate body.

[0022] The rack is provided with an abutting portion, and the bearing seat is provided with an abutting block, when the abutting block abuts against the abutting portion, the upper mold is located directly above the lower mold.

[0023] The abutting portion is provided with a piston cavity, the piston cavity is slidingly connected with a piston head, the piston head is fixedly connected with a force transmission rod, the force transmission rod slidingly passes through the abutting portion, the piston cavity is in communication with the inner cavity of the gas cylinder, when the abutting block abuts against the abutting portion and the force transmission rod is pressed to be flush with the upper end surface of the abutting portion, the communication area between the piston cavity and the inner cavity of the gas cylinder is reduced, so that the gas pressure rises to drive the piston rod of the gas cylinder to eject, at this time, when the upper mold moves away from the lower mold, the ejector pin drives the workpiece to be ejected by the upper mold under the action of the gas cylinder.

[0024] Through the above technical solution, when the workpiece is formed, the bearing assembly is turned over to the state that the abutting block abuts against the abutting portion, at this time the force transmission rod is compressed to be flush with the abutting portion, when the mounting seat drives the upper mold to move, the piston rod of the driving gas cylinder is ejected under the action of the pressure to drive the ejector pin to eject the workpiece from the cavity of the lower mold, and the workpiece moves synchronously with the upper mold when it is ejected, until the upper mold and the workpiece are separated. When the workpiece is ejected, it is supported by the upper mold, reducing the situation that the workpiece moves by inertia and collides with the ejector pin when it is ejected, so that the workpiece is more convenient to demold.

[0025] Optionally, the bearing assembly is further provided with a pressure detection unit, the pressure detection unit comprising a pressure sensor arranged on the lower end surface of the abutting block, a controller electrically connected with the pressure sensor, and a display electrically connected with the controller, the pressure detection unit being used for detecting the abutting force between the force transmission rod and the abutting block.

[0026] By the above technical solution, the pressure detection unit is designed, the pressure detection unit detects the abutting force between the force transmission rod and the abutting block, when the upper die and the lower die are closed, the abutting force fed back by the pressure detection unit reversely pushes the compression amount of the piston rod of the driving cylinder, and then the moving stroke of the reset rod can be detected, and then the closing degree between the upper die and the lower die can be detected, when the upper die and the lower die are not closed in place due to the molding waste, the pressure detection unit can timely feed back the result, and then the closing of the upper die and the lower die is more guaranteed, and the operation is more stable.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] (1) The bearing assembly is driven to overturn by the hydraulic cylinder II, the outer lateral wall of the liquid inlet groove is arranged, the situation that the design requirement of the liquid inlet hole of the upper die is relatively complex due to the existence of the mounting seat is improved, and the actual casting operation is more convenient;

[0029] (2) The reset of the stator is more convenient by arranging the ejector pin, the plate body and the reset rod;

[0030] (3) The piston rod, the piston head and the force transmission rod are arranged, the situation that the workpiece is knocked by the ejector pin due to inertia when the workpiece is ejected by the ejector pin is reduced, and the workpiece is more convenient to demold. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a schematic view of the overall structure of the first embodiment;

[0032] Figure 2 It is a schematic view of the mold opening state of the first embodiment;

[0033] Figure 3 It is a schematic view of the bearing assembly of the first embodiment in the laid-down state;

[0034] Figure 4 It is a schematic view of the driving member structure of the first embodiment;

[0035] Figure 5 It is a schematic view of the structure of the second embodiment;

[0036] Figure 6 It is a schematic view of the driving member structure of the second embodiment.

[0037] Mark No. : 1, rack; 2, bearing assembly; 21, bearing seat; 22, mounting seat; 3, guide rod; 4, mounting plate; 5, hydraulic cylinder one; 6, mold; 61, upper mold; 62, lower mold; 621, liquid inlet groove; 7, hydraulic cylinder two; 8, abutting block; 9, abutting part; 10, limiting part; 11, ejector pin; 12, plate body; 13, reset rod; 14, driving piece; 141, driving oil cylinder; 142, driving plate; 143, driving rod; 144, air cylinder; 15, piston cavity; 16, piston head; 17, force transmission rod; 18, pressure detection unit; 181, pressure sensor; 182, display. DETAILED DESCRIPTION

[0038] The application will be further described in detail below with reference to the accompanying drawings.

[0039] The application discloses a gravity casting device.

[0040] Embodiment:

[0041] A gravity casting device, referring to Figure 1 , comprising a rack 1, the rack 1 is provided with a bearing assembly 2, the bearing assembly 2 comprises a bearing seat 21 and a mounting seat 22. The bearing seat 21 is hinged to the rack 1, and the hinge axis of the bearing seat 21 is horizontal. The mounting seat 22 is slidingly connected to the bearing seat 21, and the specific structure is that four guide rods 3 are fixed to the bearing seat 21, the length direction of each guide rod 3 is perpendicular to the end face of the bearing seat 21 towards the mounting seat 22, each guide rod 3 slidingly penetrates the mounting seat 22, and the mounting seat 22 is slidingly connected to the guide rod 3 along the length direction of the guide rod 3 to realize sliding relative to the bearing seat 21.

[0042] The upper end of the guide rod 3 is fixed with a mounting plate 4, the mounting plate 4 is fixed with a hydraulic cylinder one 5, the hydraulic cylinder one 5 is indirectly mounted to the rack 1 through the mounting plate 4, the piston rod of the hydraulic cylinder one 5 is fixed with the mounting seat 22, and the specific fixing structure can adopt welding or bolt fastening. The piston rod of the hydraulic cylinder one 5 is extended to drive the mounting seat 22 to approach the bearing seat 21.

[0043] In actual use, referring to Figure 1 and Figure 2 , the bearing assembly 2 is used for mounting a mold 6, the mold 6 comprises an upper mold 61 and a lower mold 62, the upper mold 61 is mounted to the mounting seat 22, the lower mold 62 is mounted to the bearing seat 21, and the upper mold 61 and the lower mold 62 both have a cavity. When the hydraulic cylinder one 5 drives the mounting seat 22 to approach the bearing seat 21 so that the upper mold 61 and the lower mold 62 are combined, the upper mold 61 and the lower mold 62 are spliced to form the entire cavity for forming a workpiece. The side wall of the lower mold 62 is provided with a liquid inlet groove 621, the opening of the liquid inlet groove 621 faces the direction of the mounting seat 22, and the liquid inlet groove 621 is communicated with the cavity of the mold 6.

[0044] The hydraulic cylinder two 7 is hinged to the rack 1, and the piston rod of the hydraulic cylinder two 7 is hinged to the bearing seat 21. Two abutting blocks 8 are fixed to the end face of the bearing seat 21 away from the mounting seat 22, the two abutting blocks 8 are cylindrical blocks, the axis of the abutting blocks 8 is parallel to the length direction of the guide rod 3, and the two abutting blocks 8 are spaced apart along the hinging axis of the bearing seat 21. The rack 1 is fixed with two abutting portions 9, the two abutting portions 9 are vertical columns, and the positions of the two abutting portions 9 correspond to the two abutting blocks 8 one by one. When the piston rod of the hydraulic cylinder two 7 is extended, the hydraulic cylinder two 7 drives the bearing seat 21 to overturn, so that the abutting blocks 8 abut against the upper end faces of the corresponding abutting portions 9, the upper die 61 is located directly above the lower die 62, and at this time, the notch of the liquid inlet groove 621 is upward.

[0045] Referring to Figure 2 and Figure 3 The rack 1 is further fixed with two limiting portions 10, the two limiting portions 10 are vertical columnar structures, when the piston rod of the hydraulic cylinder two 7 is retracted, the hydraulic cylinder two 7 drives the bearing assembly 2 to overturn, so that the bearing seat 21 abuts against the upper end faces of the limiting columns, the liquid inlet groove 621 is located directly above the cavity, the notch of the liquid inlet groove 621 faces the horizontal direction, and the metal liquid in the liquid inlet groove 621 is guided into the cavity for molding.

[0046] Referring to Figure 2 and Figure 4 In order to facilitate the workpiece to be molded and then to be taken out of the cavity of the lower die 62, a plurality of ejector pins 11 are arranged on the bearing seat 21, the length directions of the ejector pins 11 are parallel to the sliding direction of the mounting seat 22, each ejector pin 11 slides through the lower die 62, and the upper end of each ejector pin 11 is used for extending into the cavity of the lower die 62. The bearing seat 21 is further provided with a plate body 12, and the lower end of each ejector pin 11 is fixed to the upper end face of the plate body 12. The bearing seat 21 is further provided with a driving member 14, the driving member 14 is used for driving the plate body 12 to move and then driving the ejector pins 11 to slide along the length directions of the ejector pins 11 so that the ejector pins 11 penetrate into the cavity of the lower die 62 and push the workpiece towards the upper die 61.

[0047] The driving member 14 comprises a driving oil cylinder 141, a driving plate 142 and a plurality of driving rods 143. The cylinder body of the driving oil cylinder 141 is mounted on the bearing seat 21, the driving plate 142 is fixedly mounted on the piston rod of the driving oil cylinder 141, each driving rod 143 is fixed to the end face of the driving plate 142 away from the driving oil cylinder 141, and the length direction of each driving rod 143 is parallel to the axis of the piston rod and parallel to the length direction of each ejector pin 11.

[0048] When the piston rod of the driving oil cylinder 141 is extended, the piston rod drives the driving plate 142 to move, so that the driving rod 143 abutting against one end of the plate body 12 away from the ejector pin 11 drives the plate body 12 to move, and then the ejector pin 11 is pushed out to take the workpiece out of the cavity of the die 6.

[0049] In order to facilitate the reset of the ejector pin 11, the plate body 12 is further fixed with a plurality of reset rods 13, each of which is slid through the upper end of the lower mold 62, and the position of the reset rod 13 is staggered with the position of the cavity. When the upper mold 61 and the lower mold 62 are closed, the lower end surface of the upper mold 61 presses the reset rod 13 so that the upper end surface of the reset rod 13 is flush with the upper end surface of the lower mold 62, and at this time, the upper end surface of the ejector pin 11 is flush with the inner wall of the cavity of the lower mold 62.

[0050] The working principle of the embodiment is as follows:

[0051] First, the upper mold 61 and the lower mold 62 are installed in place, then the hydraulic cylinder two 7 drives the bearing assembly 2 to flip to the state of abutting against the abutting portion 9, the hydraulic cylinder one 5 drives the mounting seat 22 to move so that the upper mold 61 and the lower mold 62 are in the closed state, and then a sufficient amount of metal liquid (generally aluminum liquid) is poured into the liquid inlet groove 621. The hydraulic cylinder two 7 drives the bearing assembly 2 to flip to the state of abutting against the abutting portion 9, and in this process, the liquid inlet groove 621 moves to the upper side of the cavity, and the metal liquid in the liquid inlet groove 621 is guided to flow into the cavity, and after the metal liquid is solidified, the hydraulic cylinder two 7 drives the bearing assembly 2 to flip to the state of abutting block 8 abutting against the abutting portion 9, at this time, the upper mold 61 and the lower mold 62 are distributed along the vertical direction, and then the hydraulic cylinder one 5 drives the mounting seat 22 to move upwards so that the upper mold 61 and the lower mold 62 are separated.

[0052] When the mounting seat 22 drives the upper mold 61 to move away from the lower mold 62, the piston rod of the drive cylinder 141 is extended to drive the driving plate 142 and the driving rod 143 to move upwards, the driving rod 143 drives the plate body 12 to move upwards so that each ejector pin 11 moves upwards to eject the workpiece from the cavity of the lower mold 62, and at the same time, the upward movement of the plate body 12 also makes the reset rod 13 protrude from the upper end surface of the lower mold 62. After the operator takes down the workpiece, the hydraulic cylinder one 5 drives the mounting seat 22 to move downwards, and in the movement process of the upper mold 61, the reset rod 13 is pressed so that the upper end surface of the reset rod 13 is reset to be flush with the upper end surface of the lower mold 62, at this time, the upper end surface of the ejector pin 11 is flush with the inner wall of the cavity of the lower mold 62, at this time, the upper mold 61 and the lower mold 62 are in the closed state, and then the next casting can be carried out.

[0053] Embodiment two:

[0054] A gravity casting device, referring to Figure 5 and Figure 6 The difference between the embodiment and the embodiment one is that the structure of the driving member 14 is different. The driving member 14 is a gas cylinder 144, the cylinder body of the gas cylinder 144 is installed on the rack 1, and the piston rod of the gas cylinder 144 is extended to push the plate body 12 to move to eject the ejector pin 11.

[0055] Each abutment portion 9 has a piston chamber 15, and each piston chamber 15 is slidably connected to a piston head 16, with the piston head 16 sliding vertically. The piston head 16 divides the corresponding piston chamber 15 into upper and lower chambers. The lower chamber is connected to the cylinder body of the cylinder 144 via a flexible plastic conduit for air supply. When the lower piston chamber 15 is compressed, the gas is delivered to the cylinder body of the cylinder 144, pushing the piston rod of the cylinder 144 to extend. A force transmission rod 17 is fixed to the upper end of the piston head 16, and the force transmission rod 17 slides upward through the upper end face of the abutment portion 9.

[0056] When hydraulic cylinder 2 drives the bearing assembly 2 to rotate, causing the abutment block 8 to abut against the abutment part 9, the abutment block 8 presses the upper end face of the force transmission rod 17 to a state flush with the upper end face of the abutment part 9. At this time, the piston chamber 15 located below is in a compressed state, causing the pressure to rise. At this time, the piston rod of cylinder 144 tends to extend. When hydraulic cylinder 5 drives the mounting base 22 to move, causing the upper mold 61 to move away from the lower mold 62, the ejector pin 11 rises under the action of the piston rod of cylinder 144 to lift the workpiece. During the lifting process, the workpiece moves in contact with the upper mold 61 until the ejector pin 11 rises to the highest point and the upper mold 61 separates from the workpiece. When the workpiece is ejected, it is supported by the upper mold 61 to reduce the possibility of the workpiece colliding with the ejector pin 11 due to inertial movement when it is ejected.

[0057] See Figure 5 The bearing assembly 2 also includes a pressure detection unit 18, which comprises a pressure sensor 181, a controller, and a display 182. The pressure sensor 181 is mounted on the lower end face of the abutment block 8, and the abutment block 8 abuts against the force transmission rod 17 through the pressure sensor 181. The controller is electrically connected to the display 182 and the pressure sensor 181. The display 182 is mounted on the bearing base 21 or the frame 1 to display the pressure value. In practice, a mounting groove is provided on the lower end face of the abutment block 8. The size of the mounting groove is larger than the cross-sectional area of ​​the force transmission rod 17. The pressure sensor 181 is installed in the mounting groove, with one end of the pressure sensor 181 facing the groove opening. When the abutment block 8 abuts against the abutment part 9, only the force transmission rod 17 abuts against the pressure sensor 181.

[0058] When the abutting block 8 abuts against the abutting portion and the mold 6 is closed, based on the situation that the lower piston cavity 15 is compressed and the piston rod is not extended, the pressure of the pressure sensor 181 rises, and the pressure detection unit 18 can detect the abutting force between the force transmission rod 17 and the abutting block 8. The abutting force fed back by the pressure detection unit 18 can deduce the compression amount of the piston rod of the driving cylinder 144, and then the moving stroke of the reset rod 13 can be detected, and then the closing degree between the upper mold 61 and the lower mold 62 can be detected. When the upper mold 61 and the lower mold 62 are not closed in place due to the molding waste, the pressure detection unit 18 can timely feed back the result, and then the closing of the upper mold 61 and the lower mold 62 is more guaranteed.

[0059] In actual use, in order to improve the detection accuracy of the pressure detection unit 18, oil is supplemented in the cavity in which the piston cavity 15 is located below the corresponding piston head 16 and the cavity of the cylinder 144 communicated with the cavity, and the proportion of gas in the space is reduced by filling the space with oil. The proportion of gas only needs to be more than 10%-30% of the maximum compression amount, and the movement of the reset rod 13 is more obvious to the change of force, so that the detection accuracy is better.

[0060] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A gravity casting device, comprising a frame (1) provided with a bearing assembly (2) for mounting a mold (6), the mold (6) comprising an upper mold (61) and a lower mold (62), the upper mold (61) and the lower mold (62) being closed to form a mold cavity, an outer wall of the lower mold (62) being provided with a liquid inlet groove (621) in communication with the mold cavity; characterized in that: The bearing assembly (2) comprises a bearing seat (21) hinged to the frame (1), a mounting seat (22) slidingly connected to the bearing seat (21), and a first hydraulic cylinder (5) for driving the mounting seat (22) to move close to the bearing seat (21); the frame (1) is further provided with a second hydraulic cylinder (7) for driving the bearing assembly (2) to overturn so that the mold (6) is overturned to guide the molten metal in the liquid inlet groove (621) into the cavity; the bearing seat (21) is slidingly connected to a ejector pin (11), the sliding direction of the ejector pin (11) is parallel to the sliding direction of the mounting seat (22), the bearing seat (21) is further provided with a driving member (14) for driving the ejector pin (11) to penetrate into the cavity of the lower mold (62) to eject the workpiece towards the upper mold (61); the ejector pin (11) is provided with a plurality of; further comprising a plate body (12), each ejector pin (11) is fixed to the plate body (12), the driving member (14) drives the plate body (12) to move and in turn drives the ejector pin (11) to move; the plate body (12) is further provided with a reset rod (13), the reset rod (13) slidingly penetrates out of the upper side of the lower mold (62), the position of the reset rod (13) is staggered with the position of the cavity, when the upper mold (61) and the lower mold (62) are closed, the upper mold (61) abuts against the reset rod (13) so that the ejector pin (11) is flush with the inner wall of the cavity of the lower mold (62); the driving member (14) is a cylinder (144), the piston rod of the cylinder (144) is used for pushing the plate body (12); The frame (1) is provided with an abutting portion (9), the bearing seat (21) is provided with an abutting block (8), when the abutting block (8) abuts against the abutting portion (9), the upper mold (61) is located directly above the lower mold (62); The abutting portion (9) is provided with a piston cavity (15), the piston cavity (15) is slidingly connected with a piston head (16), the piston head (16) is fixed with a force transmission rod (17), the force transmission rod (17) slidingly penetrates out of the abutting portion (9), the piston cavity (15) is in communication with the inner cavity of the cylinder (144), when the abutting block (8) abuts against the abutting portion (9) so that the force transmission rod (17) is pressed to be flush with the upper end surface of the abutting portion (9), the area of the piston cavity (15) in communication with the inner cavity of the cylinder (144) becomes smaller so that the air pressure rises to drive the piston rod of the cylinder (144) to eject, at this time, when the upper mold (61) moves away from the lower mold (62), the ejector pin (11) drives the workpiece to be ejected by abutting against the upper mold (61) under the action of the cylinder (144). The bearing assembly (2) is further provided with a pressure detection unit (18), the pressure detection unit (18) comprises a pressure sensor (181) arranged on the lower end surface of the abutting block (8), a controller electrically connected with the pressure sensor (181), and a display (182) electrically connected with the controller, and the pressure detection unit (18) is used for detecting the abutting force between the force transmission rod (17) and the abutting block (8).

2. The gravity casting apparatus according to claim 1, characterized by: The rack (1) is provided with a limiting portion (10), and the limiting portion (10) is arranged such that the liquid inlet groove (621) is located directly above the cavity when being abutted by the bearing assembly (2).

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