Sand casting mold for diesel engine crankshaft production

Abstract

The utility model relates to the technical field of diesel engine crankshaft production, in particular to a sand casting mold for diesel engine crankshaft production, which comprises a base, a pressure applying mechanism and a limiting mechanism are mounted on the base, a lower mold is fixed at the top end of the limiting mechanism, and a demolding mechanism is mounted on the lower mold in a sliding manner. The demolding mechanism comprises a support and hydraulic rods, the two hydraulic rods are symmetrically and fixedly installed at the bottom end of the lower mold, the telescopic ends of the hydraulic rods are fixedly connected with the support, a connecting plate is fixedly installed on the support, two sets of mold drawing rods are fixedly installed on the connecting plate, and the mold drawing rods are in sliding connection with the lower mold. A cavity is formed in the lower die, and an upper die is fixed on the pressure applying mechanism; when the upper mold is separated from the lower mold, the hydraulic rod drives the support to move upwards, the connecting plate can drive the multiple mold drawing rods to abut against the formed sand mold, and then the sand mold can be taken out of the lower mold quickly.

Description

Technical Field

[0001] This utility model relates to a casting mold, specifically a sand casting mold for diesel engine crankshaft production, belonging to the field of diesel engine crankshaft production technology. Background Technology

[0002] The diesel engine crankshaft is a core component of the engine, playing a crucial role in converting the reciprocating motion of the piston into rotational motion and outputting power. Diesel engine crankshafts typically have complex features such as multiple crank arms, balance weights, and internal oil passages. Sand casting can precisely form the crankshaft by combining sand cores (such as oil passage cores and main journal cores), avoiding the complex cavity structures that are difficult to achieve through forging or machining.

[0003] However, in the sand casting process, the mold is divided into two parts. After the upper part is lifted, it is joined with the lower part to form a complete sand mold exposed to the air. The complex cavity structure increases the friction and resistance when demolding. If the sand mold is pulled out directly, the edges or corners of the sand mold and the mold may be damaged, which may easily affect the subsequent use effect and the quality of the casting. Utility Model Content

[0004] The purpose of this utility model is to provide a sand casting mold for diesel engine crankshaft production in order to solve the above problems. When the upper mold and the lower mold are separated, the support is moved upward by the hydraulic rod, which can drive the connecting plate to move multiple mold-lifting rods to abut against the formed sand mold, thereby making it easy to quickly remove the sand mold from the lower mold.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a sand casting mold for diesel engine crankshaft production, comprising a base, on which a pressure applying mechanism and a limiting mechanism are installed. A lower mold is fixed to the top of the limiting mechanism, and a demolding mechanism is slidably installed on the lower mold. The demolding mechanism includes a bracket and hydraulic rods. Two hydraulic rods are symmetrically fixedly installed at the bottom end of the lower mold. A bracket is fixedly connected to the telescopic end of the hydraulic rods. A connecting plate is fixedly installed on the bracket. Two sets of demolding rods are fixedly installed on the connecting plate. The demolding rods are slidably connected to the lower mold. A cavity is provided inside the lower mold, and an upper mold is fixed on the pressure applying mechanism.

[0006] Preferably, the demolding mechanism further includes through holes, and two sets of through holes are symmetrically provided in the lower mold, with a demolding rod slidably installed at the through hole.

[0007] Preferably, the limiting mechanism includes a pad and a locking rod. Two sets of locking rods are slidably installed in the base. A pad is engaged with the locking rod. A positioning block is threaded onto the top of the locking rod. Several fixing rods are fixedly connected at equal intervals on the pad. The fixing rods are fixedly connected to the lower mold.

[0008] Preferably, the limiting mechanism further includes a slot and a groove, with two slots symmetrically provided on the base and two grooves provided on the side of the pad away from the fixing rod.

[0009] Preferably, a locking rod is slidably mounted on the slot, and the end diameter of the locking rod is equal to the width of the slot.

[0010] Preferably, a locking rod is engaged in the slot portion, and the width of the top of the slot is greater than the width of the bottom of the slot.

[0011] Preferably, the positioning block abuts against the inner wall of the pad, and the top of the positioning block is configured with a regular hexagonal structure.

[0012] Preferably, the pressure applying mechanism includes a column and a sliding seat. Two sets of columns are fixedly installed on the base, and a sliding seat is slidably connected to the column. The sliding seat is fixedly connected to the telescopic end of the hydraulic cylinder, and several support rods are fixedly connected to the sliding seat.

[0013] Preferably, the two sets of support rods are symmetrically located at the bottom end of the sliding seat, and an upper mold is fixedly connected to the support rods.

[0014] The beneficial effects of this utility model are as follows: After the sand mold is formed, the pressure mechanism is activated, which can cause the upper mold and the lower mold to separate. The sand mold is located inside the lower mold. When demolding the sand mold, the control switch of the hydraulic rod is turned on. The hydraulic rod can drive the bracket fixed at its telescopic end to slide closer to the lower mold. The two brackets are fixedly connected to the connecting plate. Two sets of demolding rods are symmetrically installed on the connecting plate. When the bracket drives the connecting plate to move up, the demolding rods can move with the connecting plate. Then, when the top of the demolding rod slides out of the lower mold, it can squeeze the part of the sand mold that contacts the inner wall of the lower mold, so that multiple demolding rods can lift the sand mold, making it easy for the operator to take the sand mold out of the lower mold. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the connection structure between the support rod and the upper mold of this utility model;

[0017] Figure 3 This is a schematic diagram of the connection structure between the lower mold and the mold-lifting rod of this utility model;

[0018] Figure 4 This is a schematic diagram of the connection structure between the lower mold and the fixing rod of this utility model;

[0019] Figure 5 for Figure 4 The diagram shows an enlarged view of part A.

[0020] Figure 6 This is a schematic diagram of the connection structure of the connecting plate and the mold-lifting rod of this utility model.

[0021] In the diagram: 1. Base; 2. Pressing mechanism; 201. Column; 202. Sliding seat; 203. Hydraulic cylinder; 204. Support rod; 3. Upper mold; 4. Lower mold; 5. Demolding mechanism; 501. Cavity; 502. Through hole; 503. Connecting plate; 504. Demolding rod; 505. Bracket; 506. Hydraulic rod; 6. Limiting mechanism; 601. Slot; 602. Pad; 603. Fixing rod; 604. Locking rod; 605. Positioning block; 606. Slot. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-6 As shown, a sand casting mold for diesel engine crankshaft production includes a base 1. A pressure applying mechanism 2 and a limiting mechanism 6 are mounted on the base 1. A lower mold 4 is fixed to the top of the limiting mechanism 6. A demolding mechanism 5 is slidably mounted on the lower mold 4. The demolding mechanism 5 includes a bracket 505 and hydraulic rods 506. Two hydraulic rods 506 are symmetrically fixed to the bottom end of the lower mold 4. The extension and retraction ends of the hydraulic rods 506 are fixedly connected to the bracket 505. A connecting plate 503 is fixedly mounted on the bracket 505. Two sets of demolding rods 504 are fixedly mounted on the connecting plate 503. Opening the hydraulic rods 506 drives the bracket 505 to move closer to the lower mold. When the support 505 moves the connecting plate 503 upward, the mold-lifting rod 504 can move with the connecting plate 503; two sets of through holes 502 are symmetrically arranged inside the lower mold 4, and the mold-lifting rod 504 is slidably connected to the lower mold 4. When the top of the mold-lifting rod 504 slides out of the lower mold 4, it can squeeze the part of the sand mold that contacts the inner wall of the lower mold 4, so that multiple mold-lifting rods 504 can lift the sand mold; the lower mold 4 is provided with a cavity 501. The sand-shooting machine injects molding sand mixed with curing agent into the cavity 501 of the mold through the nozzle. After sand shooting, air pressure or hydraulic pressure is immediately applied to improve the compactness of the sand mold; the upper mold 3 is fixed on the pressure application mechanism 2.

[0024] As a technical optimization of this utility model, the limiting mechanism 6 includes a pad 602 and a locking rod 604. Two sets of locking rods 604 are slidably installed inside the base 1. The pad 602 is engaged with the locking rod 604. A positioning block 605 is threadedly installed on the top of the locking rod 604. The positioning block 605 abuts against the inner wall of the pad 602. The top of the positioning block 605 is a regular hexagonal structure. Several fixing rods 603 are fixedly connected at equal intervals on the pad 602. The fixing rods 603 are fixedly connected to the lower mold 4. When plate 602 moves the fixing rod 603, the fixed position of the lower mold 4 can be determined. Two slots 601 are symmetrically provided on the base 1. The end diameter of the locking rod 604 is equal to the width of the slot 601. Two slots 606 are provided on the side of the pad 602 away from the fixing rod 603. The locking rod 604 is slidably installed into the slot 601. After its position is determined, the pad 602 is sleeved on the side wall of the locking rod 604. By rotating the positioning block 605 with a tool, the positioning block 605 can fix the pad 602 on the top of the base 1.

[0025] As a technical optimization of this utility model, the pressure applying mechanism 2 includes a column 201 and a sliding seat 202. Two sets of columns 201 are fixedly installed on the base 1. The sliding seat 202 is slidably connected to the column 201. The sliding seat 202 is fixedly connected to the telescopic end of the hydraulic cylinder 203. Several support rods 204 are fixedly connected to the sliding seat 202. The two sets of support rods 204 are symmetrically located at the bottom end of the sliding seat 202. The upper mold 3 is fixedly connected to the support rod 204. When the hydraulic cylinder 203 is activated, its telescopic end will drive the sliding seat 202 to slide closer to the base 1. When the sliding seat 202 slides along the column 201, the upper mold 3 and the lower mold 4 can be engaged together.

[0026] In use, the clamping rod 604 is slidably installed into the slot 601 provided in the base 1. The clamping rod 604 slides within the base 1. Once its position is determined, the pad 602 is fitted onto the side wall of the clamping rod 604. By rotating the positioning block 605 with a tool, the positioning block 605 can fix the pad 602 to the top of the base 1. A fixing rod 603 is installed on the pad 602. The top end of the fixing rod 603 is fixedly connected to the lower mold 4. When the pad 602 moves the fixing rod 603, the fixed position of the lower mold 4 can be determined. The hydraulic cylinder 203 is activated, and its telescopic end will drive the sliding seat 202 to slide closer to the base 1. When the sliding seat 202 slides along the column 201, the upper mold 3 fixed at the end of the support rod 204 can be engaged with the lower mold 4. Then, molding sand mixed with curing agent is injected into the mold cavity 501 through the nozzle using a sand shooting machine. Immediately after sand shooting... Pneumatic or hydraulic pressure is applied to increase the compactness of the sand mold. After the sand mold has solidified, the hydraulic cylinder 203 is activated, which causes the sliding seat 202 to move the support rod 204 upward, thereby causing the support rod 204 to separate the upper mold 3 from the lower mold 4. The sand mold is located inside the lower mold 4. When demolding the sand mold, the control switch of the hydraulic rod 506 is turned on. The hydraulic rod 506 can drive the bracket 505 fixed at its telescopic end to slide closer to the lower mold 4. The two brackets 505 are fixedly connected to the connecting plate 503. Two sets of demolding rods 504 are symmetrically installed on the connecting plate 503. When the bracket 505 moves the connecting plate 503 upward, the demolding rods 504 can move with the connecting plate 503. When the top of the demolding rod 504 slides out of the lower mold 4, it can squeeze the part of the sand mold that contacts the inner wall of the lower mold 4, thereby making it easy for the operator to remove the sand mold from the lower mold 4.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sand casting mold for producing a diesel engine crankshaft, comprising a base (1), characterized in that: The base (1) is equipped with a pressure mechanism (2) and a limiting mechanism (6). The top of the limiting mechanism (6) is fixed with a lower mold (4). The lower mold (4) is slidably installed with a demolding mechanism (5). The demolding mechanism (5) includes a bracket (505) and a hydraulic rod (506). Two hydraulic rods (506) are symmetrically fixed at the bottom of the lower mold (4). The extension end of the hydraulic rod (506) is fixedly connected to the bracket (505). A connecting plate (503) is fixedly installed on the bracket (505). Two sets of demolding rods (504) are fixedly installed on the connecting plate (503). The demolding rods (504) are slidably connected to the lower mold (4). The lower mold (4) is provided with a cavity (501). The pressure mechanism (2) is fixed with an upper mold (3).

2. A sand casting mold for producing a diesel engine crankshaft according to claim 1, characterized in that: The demolding mechanism (5) also includes a through hole (502). Two sets of through holes (502) are symmetrically provided in the lower mold (4). A demolding rod (504) is slidably installed in the through hole (502).

3. A sand casting mold for producing a diesel engine crankshaft according to claim 1, characterized in that: The limiting mechanism (6) includes a pad (602) and a locking rod (604). Two sets of locking rods (604) are slidably installed in the base (1). The pad (602) is engaged with the locking rod (604). A positioning block (605) is threaded onto the top of the locking rod (604). Several fixing rods (603) are fixedly connected at equal intervals on the pad (602). The fixing rods (603) are fixedly connected to the lower mold (4).

4. A sand casting mold for producing a diesel engine crankshaft according to claim 3, characterized in that: The limiting mechanism (6) also includes a slot (601) and a slot (606). Two slots (601) are symmetrically provided on the base (1), and two slots (606) are provided on the side of the pad (602) away from the fixing rod (603).

5. A sand casting mold for producing a diesel engine crankshaft according to claim 4, characterized in that: A locking rod (604) is slidably installed in the slot (601), and the end diameter of the locking rod (604) is equal to the width of the slot (601).

6. A sand casting mold for producing a diesel engine crankshaft according to claim 4, characterized in that: A locking lever (604) is engaged with the slot (606), and the width of the top of the slot (606) is greater than the width of the bottom of the slot (606).

7. A sand casting mold for producing a diesel engine crankshaft according to claim 3, characterized in that: The positioning block (605) abuts against the inner wall of the pad (602), and the top of the positioning block (605) is set in a regular hexagonal structure.

8. A sand casting mold for producing a diesel engine crankshaft according to claim 1, characterized in that: The pressure applying mechanism (2) includes a column (201) and a sliding seat (202). Two sets of columns (201) are fixedly installed on the base (1). The sliding seat (202) is slidably connected to the column (201). The sliding seat (202) is fixedly connected to the telescopic end of the hydraulic cylinder (203). Several support rods (204) are fixedly connected to the sliding seat (202).

9. A sand casting mold for producing a diesel engine crankshaft according to claim 8, characterized in that: The two sets of support rods (204) are symmetrically located at the bottom end of the sliding seat (202), and the upper mold (3) is fixedly connected to the support rods (204).

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