A kind of marine medium-speed dual-fuel engine cylinder casting sand core deviation prevention positioning frame

Abstract

The application relates to a sand core anti-deviation positioning frame for casting of a medium-speed dual-fuel engine cylinder body. The positioning frame comprises a ring-shaped base used for fixed connection with a sand box, a plurality of anti-deviation mechanisms rotatably installed on the base and used for positioning and compacting the sand core, and a driving mechanism used for driving the anti-deviation mechanisms to rotate. The driving mechanism comprises a rotating ring rotatably installed on the base and a driving module arranged on the base and used for driving the rotating ring to rotate. Through the cooperation of the rotating ring, the limiting groove and the limiting column, one driving motor can drive all the anti-deviation mechanisms to synchronously rotate and close or open. Compared with the traditional manual operation of compacting points one by one, all compacting actions can be completed by one-time motor driving, the construction time is greatly shortened, and the production efficiency is remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of casting tooling technology, specifically relating to a sand core anti-displacement positioning frame for casting the cylinder block of a marine medium-speed dual-fuel engine. Background Technology

[0002] The cylinder block of a marine medium-speed dual-fuel engine is a core component of the marine power plant. Its internal structure is extremely complex, including a water jacket for cooling water flow, intake and exhaust passages for air and fuel gas, oil passages for lubrication, and high-pressure fuel injection channels and a pre-combustion chamber unique to dual-fuel engines. All these holes and passages must be formed by sand cores of different shapes. Therefore, the positioning accuracy of the sand cores in the mold directly determines the uniformity of the cylinder block wall thickness, the smoothness of the air passages, and the overall performance of the engine.

[0003] The core challenges faced during the casting process of sand cores include: workers need to install pressure plates and tighten bolts on each sand core one by one in the sand box, which usually requires operating 8-12 clamping points and takes 40-60 minutes. This is not only inefficient, but also difficult to control the locking force of each clamping point uniformly, resulting in large quality fluctuations due to human factors; the intake and exhaust channel cores are curved strip-shaped structures, and the high-pressure gas injection cores are slender rod-shaped structures. Under the impact of molten iron, they will not only float, but also drift laterally and rotate around their own axis. Existing technologies lack effective constraints on the lateral and rotational degrees of freedom of the sand cores, resulting in defects such as misalignment of the gas channels and skewed gas injection holes. Summary of the Invention

[0004] The purpose of this invention is to provide a sand core anti-displacement positioning frame for casting the cylinder block of a marine medium-speed dual-fuel engine in order to solve the problems mentioned in the background art.

[0005] The present invention achieves the above objectives through the following technical solutions: A sand core anti-displacement positioning bracket for casting the cylinder block of a marine medium-speed dual-fuel engine includes: An annular base for fixed connection with a sand box; Several anti-deviation mechanisms are rotatably mounted on the base for positioning and clamping the sand core; A drive mechanism is used to drive the anti-deviation mechanism to rotate; The driving mechanism includes a rotating ring rotatably mounted on the base and a driving module disposed on the base for driving the rotating ring to rotate. The rotating ring is provided with several limiting grooves at equal intervals along its circumference, and the anti-deviation mechanism is provided with limiting posts. The limiting posts are slidably engaged with the limiting grooves. When the rotating ring rotates, it drives the limiting posts to move through the limiting grooves, so that the anti-deviation mechanism as a whole rotates towards the center of the base.

[0006] Preferably, the anti-deviation mechanism includes: A rotating plate is rotatably mounted on the base via a rotating shaft. A limiting post is disposed at the end of the rotating plate, and the limiting post is eccentrically disposed with respect to the rotating shaft. The vertical shaft is fixed to the rotating plate; A mounting plate is disposed on the vertical axis; An upper pressure plate, disposed on the mounting plate, is used to press the top of the sand core from above; Side pressure plate, disposed on the mounting plate, is used to press against the middle layer of the sand core from the side.

[0007] Preferably, the drive module includes a first drive motor fixedly mounted on the base and a drive gear mounted on the output shaft end of the first drive motor; The outer ring of the rotating ring is provided with toothed grooves, and the driving gear meshes with the toothed grooves for transmission.

[0008] Preferably, the rotating ring is provided with a plurality of arc-shaped grooves along its circumference, and the base is provided with a plurality of locking posts along its circumference, the locking posts being inserted into the arc-shaped grooves; When the rotating ring rotates, the sidewall of the arc-shaped groove contacts the locking post to limit the radial displacement of the rotating ring; when the locking post contacts the end of the arc-shaped groove, the anti-displacement mechanism reaches its maximum rotation stroke.

[0009] Preferably, a second drive motor is fixedly mounted on the mounting plate, a collar is provided on the side pressure plate, and a pressure rod is movably inserted inside the collar. The lower end of the pressure rod is used to press against the lower sand core. The output shaft end of the second drive motor is provided with a lifting plate, and the outer periphery of the lifting plate is provided with an annular groove. The pressure rod contacts the annular groove, and the second drive motor drives the pressure rod to rise and fall in the vertical direction through the friction between the lifting plate and the pressure rod.

[0010] Preferably, the annular groove is provided with a plurality of locking blocks at equal intervals along the circumference of the lifting disc, and the pressure rod is provided with a plurality of locking slots at equal intervals along its length direction. The locking blocks are used to limit the pressure rod.

[0011] Preferably, the second drive motor is a stepper motor, which has a self-locking function to maintain the position of the pressure rod in the power-off state.

[0012] Preferably, a mounting bracket is fixedly provided on the pressure rod, and a first rod is provided on the mounting bracket; The upper pressure plate is rotatably mounted on the mounting plate, and a return spring is provided between the upper pressure plate and the mounting plate; When the first rod descends with the pressure rod, it pushes the upper pressure plate downward to rotate, so that the upper pressure plate presses against the top of the sand core; when the first rod rises with the pressure rod, the return spring drives the upper pressure plate to rotate upward to reset.

[0013] Preferably, a second rod is rotatably mounted on the mounting frame, a clamping plate is fixedly provided at the lower end of the second rod, and a third drive motor for driving the second rod to rotate is also fixedly provided on the mounting frame; After the pressure rod descends to the pressing position, the third drive motor drives the second rod to rotate, causing the clamping plate to rotate below the rotating plate, thereby preventing the pressure rod from retracting upwards.

[0014] The beneficial effects of this invention are as follows: 1. This invention utilizes a rotating ring, limiting groove, and limiting post structure, allowing a single drive motor to synchronously rotate and close or open all anti-deviation mechanisms. Compared to the traditional manual operation of each clamping point, this invention requires only one motor drive to complete all clamping actions, significantly reducing construction time and greatly improving production efficiency.

[0015] 2. This invention employs multiple independently rotatable anti-deviation mechanisms, with liftable pressure bars on selected anti-deviation mechanisms. These pressure bars allow the upper sand core to directly press against the lower large water jacket core. The pressing force does not need to be transmitted through an intermediate sand core, fundamentally avoiding the problem of the upper sand core being crushed, deformed, or cracked due to pressure transmission. Furthermore, the pressing force of each sand core can be independently adjusted according to its buoyancy, resulting in greater adaptability.

[0016] 3. Each anti-deviation mechanism of the present invention has both an upper pressure plate and a side pressure plate. The upper pressure plate prevents the sand core from floating upward in the Z direction, and the side pressure plates prevent the sand core from shifting laterally in the X and Y directions and rotating around the Z axis, thus achieving three-dimensional spatial constraint on the sand core.

[0017] 4. This invention uses the friction between the lifting plate and the pressure rod to drive the lifting of the pressure rod. It has a simple structure and precise control, and does not require a complex hydraulic or pneumatic system, which reduces manufacturing costs and maintenance difficulty. Attached Figure Description

[0018] Figure 1 This is a first-view schematic diagram of the present invention; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 This is a top view of the present invention; Figure 4 yes Figure 3 Enlarged view of point B in the middle; Figure 5 This is a schematic diagram showing the positional relationship between the rotating plate and the rotating ring in this invention; Figure 6 This is a schematic diagram of the anti-deviation mechanism in this invention.

[0019] In the diagram: 1. Base; 2. Rotating ring; 3. Limiting groove; 4. Limiting post; 5. Rotating plate; 6. Vertical shaft; 7. Mounting plate; 8. Upper pressure plate; 9. Side pressure plate; 10. Drive motor No. 1; 11. Drive gear; 12. Gear groove; 13. Arc groove; 14. Locking post; 15. Drive motor No. 2; 16. Collar; 17. Pressure rod; 18. Lifting plate; 19. Mounting bracket; 20. Rod No. 1; 21. Return spring; 22. Rod No. 2; 23. Locking plate; 24. Drive motor No. 3. Detailed Implementation

[0020] The present application will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example 1

[0022] like Figures 1-6 As shown, a sand core anti-deviation positioning frame for casting the cylinder block of a marine medium-speed dual-fuel engine is a combined tooling integrating positioning, locking, support, and anti-floating functions. It includes an annular base 1, several anti-deviation mechanisms rotatably mounted on the base 1 for positioning and clamping the sand core, and a drive mechanism for rotating the anti-deviation mechanisms. Preferably, the base 1 is made of high-strength ductile iron or welded steel truss, serving as the installation reference for the entire positioning frame, and is fixed to the sand box with bolts or clamps before casting.

[0023] The drive mechanism includes a rotating ring 2 rotatably mounted on the base 1 and a drive module mounted on the base 1 for driving the rotating ring 2 to rotate.

[0024] The rotating ring 2 is provided with several limiting grooves 3 corresponding to the anti-deviation mechanism. The anti-deviation mechanism is provided with limiting posts 4. When the rotating ring 2 rotates, the limiting grooves 3 drive the limiting posts 4 to rotate, causing the entire anti-deviation mechanism to rotate.

[0025] It should be noted that after the sand core is placed into the sand box, the drive module drives the rotating ring 2 to rotate. The rotating ring 2 drives the limiting post 4 to rotate along the axis of the base 1 through the limiting groove 3, causing the anti-deviation mechanism to rotate. After the anti-deviation mechanism rotates, it clamps and positions the top and sides of the sand core, thereby preventing vertical floating (Z direction) and rotational displacement (X and Y directions). This invention avoids manual operation of each clamping point, saving construction time.

[0026] In this embodiment, the anti-deviation mechanism includes a rotating plate 5, a rotating shaft on the rotating plate 5, a vertical shaft 6 on the rotating plate 5, a mounting plate 7 on the vertical shaft 6, an upper pressure plate 8 on the mounting plate 7, and a side pressure plate 9. The rotating shaft is rotatably mounted on the base 1, and the rotating shaft is not concentric with the limiting post 4.

[0027] It should be noted that the rotating shaft is located in the middle of the rotating plate 5, and the limiting post 4 is located at the end of the rotating plate 5. When the rotating ring 2 drives the limiting post 4 to rotate, it can turn the end of the rotating plate 5 away from the limiting post 4 towards the middle of the base 1 (closer to the sand core). When the anti-deviation mechanism contacts the sand core, the upper pressure plate 8 contacts the top of the sand core, providing downward pressure to the sand core and preventing it from floating. The side pressure plate 9 contacts the middle layer of the sand core, which can prevent the sand core from shifting laterally and rotating.

[0028] The specific dimensions of the anti-deviation mechanism are adapted to different sand core shapes and sizes to ensure proper positioning and locking of the sand core.

[0029] After pouring, the drive module reverses the rotation of the rotating ring 2, and the anti-deviation mechanism opens outward to detach from the casting.

[0030] Preferably, the drive module includes a first drive motor 10 fixedly mounted on the base 1 and a drive gear 11 located at the output shaft end of the first drive motor 10.

[0031] The outer ring of the rotating ring 2 is provided with several tooth grooves 12, and the driving gear 11 meshes with the tooth grooves 12.

[0032] It should be noted that the first drive motor 10 is connected to the drive gear 11 through a reducer. When the first drive motor 10 drives the drive gear 11 to rotate, it synchronously drives the rotating ring 2 to rotate, thereby driving each anti-deviation mechanism to rotate.

[0033] In this embodiment, the rotating ring 2 has several arc-shaped grooves 13 along its circumference, and the base 1 has several locking posts 14 along its circumference. The locking posts 14 are located within the arc-shaped grooves 13 and are used to limit the position of the rotating ring 2. During the rotation of the rotating ring 2, the locking posts 14 contact the sidewalls of the arc-shaped grooves 13, which can restrict the center of the rotating ring 2 and prevent the rotating ring 2 from deviating. When the locking posts 14 contact the end of the arc-shaped grooves 13, the anti-deviation mechanism can no longer rotate, which can play a protective role and prevent the anti-deviation mechanism from rotating excessively and causing crushing damage to the sand core.

[0034] Example 2

[0035] Based on Embodiment 1, in this embodiment, a second drive motor 15 is fixedly installed on the mounting plate 7, and a collar 16 is provided on the side pressure plate 9. A pressure rod 17 is movably sleeved inside the collar 16.

[0036] The output shaft end of the second drive motor 15 is provided with a lifting plate 18 that contacts the pressure rod 17. The outer ring of the lifting plate 18 is provided with a concave annular groove. The annular groove contacts the pressure rod 17 and drives the pressure rod 17 to rise and fall through friction.

[0037] It should be noted that molten iron surrounds all sand cores from the bottom and all sides, and each sand core is subjected to a huge upward buoyancy. A water jacket core weighing several hundred kilograms can experience a buoyancy of over 500 kilograms. The top pressure plate cannot effectively transfer the clamping force to the middle and lower sand cores. To clamp the lower cores, enormous pressure must be transmitted through the upper cores, which can cause the middle upper sand cores to be crushed, deformed, or cracked.

[0038] In this embodiment, a second drive motor 15 is provided to drive the lifting plate 18 to rotate. The lifting plate 18 drives the pressure rod 17 to rise and fall through the friction between itself and the pressure rod 17. When the anti-deviation mechanism moves to the locking position, the second drive motor 15 drives the pressure rod 17 to move downward, so that the lower end of the pressure rod 17 passes through the upper sand core and contacts the water jacket core, providing downward pressure to prevent the water jacket core from floating.

[0039] After casting is completed, the second drive motor 15 drives the pressure rod 17 to move upward, releasing the downward pressure on the water jacket core, and the anti-deviation mechanism can be disengaged normally.

[0040] Furthermore, several locking blocks are evenly spaced along the circumference of the lifting plate 18 within the annular groove, and several locking slots are evenly spaced along the length of the pressure rod 17. The locking blocks are used to limit the movement of the pressure rod 17. The locking blocks and slots prevent the pressure rod 17 from sliding relative to the lifting plate 18. When the lower end of the pressure rod 17 presses against the water jacket core, the pressing will not fail due to relative sliding of the pressure rod 17.

[0041] Meanwhile, the second drive motor 15 is a stepper motor with a self-locking function, which can lock the position of the pressure rod 17.

[0042] Example 3

[0043] Based on embodiment 2, the pressure rod 17 is provided with a mounting bracket 19, and the mounting bracket 19 is provided with a first rod 20 for pressing the upper pressure plate 8.

[0044] The upper pressure plate 8 is rotatably mounted on the mounting plate 7, and a return spring 21 is provided between the upper pressure plate 8 and the mounting plate 7.

[0045] It should be noted that because the upper pressure plate 8 moves horizontally to the pressing position, its continuous movement after contacting the top of the sand core may cause the sand core to shift or be damaged. By rotating the upper pressure plate 8 onto the mounting plate 7 and connecting the upper pressure plate 8 and the mounting plate 7 with the return spring 21, the end of the upper pressure plate 8 away from the mounting plate 7 is in a tilted state.

[0046] When the upper pressure plate 8 moves above the sand core, it does not contact the sand core. When the pressure rod 17 moves downward, it drives the mounting bracket 19 and the first rod 20 to move downward. After the first rod 20 contacts the upper pressure plate 8, it drives the upper pressure plate 8 to rotate downward until the upper pressure plate 8 contacts the upper end of the sand core and exerts downward pressure on the sand core. At this time, the return spring 21 is stretched.

[0047] When the pressure rod 17 moves upward, the first rod 20 no longer provides downward pressure to the upper pressure plate 8. Under the tension of the return spring 21, the upper pressure plate 8 is once again in a tilted state.

[0048] Furthermore, a second rod 22 is rotatably mounted on the mounting bracket 19, and a clamping plate 23 is fixedly provided at the lower end of the second rod 22.

[0049] Mounting bracket 19 is fixedly equipped with drive motor 24 for rotating rod 22.

[0050] It should be noted that because the water jacket core has a large buoyancy, the water jacket core exerts a large force on the pressure rod 17, which may damage the second drive motor 15 and cause casting failure.

[0051] In this embodiment, a third drive motor 24 is provided. After the pressure rod 17 is lowered to the pressing position, the third drive motor 24 drives the second rod 22 to rotate, which rotates the clamping plate 23 to below the rotating plate 5. The clamping plate 23 can prevent the pressure rod 17 from moving upward, thereby protecting the second drive motor 15 and increasing the downward pressure effect of the pressure rod 17 on the water jacket core.

[0052] After casting is completed, the No. 3 drive motor 24 drives the No. 2 rod 22 to rotate, which rotates the clamping plate 23 out from under the rotating plate 5, and the pressure rod 17 can be raised and lowered freely.

[0053] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A sand core anti-displacement positioning frame for casting the cylinder block of a marine medium-speed dual-fuel engine, characterized in that, include: An annular base (1) is used for fixed connection with a sand box; Several anti-deviation mechanisms are rotatably mounted on the base (1) for positioning and pressing the sand core; A drive mechanism is used to drive the anti-deviation mechanism to rotate; The driving mechanism includes a rotating ring (2) rotatably mounted on the base (1) and a driving module disposed on the base (1) for driving the rotating ring (2) to rotate. The rotating ring (2) is provided with several limiting grooves (3) at equal intervals along its circumference. The anti-deviation mechanism is provided with limiting posts (4). The limiting posts (4) are slidably engaged with the limiting grooves (3). When the rotating ring (2) rotates, it drives the limiting posts (4) to move through the limiting grooves (3), so that the anti-deviation mechanism rotates as a whole toward the center of the base (1).

2. The sand core anti-displacement positioning frame for casting a marine medium-speed dual-fuel engine cylinder block according to claim 1, characterized in that, The anti-deviation mechanism includes: Rotating plate (5), the rotating plate (5) is rotatably mounted on the base (1) via a rotating shaft, the limiting post (4) is disposed at the end of the rotating plate (5), and the limiting post (4) is eccentrically disposed with respect to the rotating shaft; The vertical shaft (6) is fixed on the rotating plate (5); Mounting plate (7) is mounted on the vertical axis (6); An upper pressure plate (8) is disposed on the mounting plate (7) for pressing the top of the sand core from above; Side pressure plate (9) is provided on the mounting plate (7) for pressing against the middle part of the sand core from the side.

3. The sand core anti-displacement positioning frame for casting a marine medium-speed dual-fuel engine cylinder block according to claim 1, characterized in that, The drive module includes a first drive motor (10) fixedly mounted on the base (1) and a drive gear (11) mounted on the output shaft end of the first drive motor (10). The outer ring of the rotating ring (2) is provided with a toothed groove (12), and the driving gear (11) meshes with the toothed groove (12) for transmission.

4. The sand core anti-displacement positioning frame for casting a marine medium-speed dual-fuel engine cylinder block according to claim 1, characterized in that, The rotating ring (2) has several arc-shaped grooves (13) along its circumference, and the base (1) has several locking posts (14) along its circumference. The locking posts (14) are inserted into the arc-shaped grooves (13). When the rotating ring (2) rotates, the side wall of the arc groove (13) contacts the locking post (14) to limit the radial offset of the rotating ring (2); when the locking post (14) contacts the end of the arc groove (13), the anti-offset mechanism reaches its maximum rotation stroke.

5. The sand core anti-displacement positioning frame for casting a marine medium-speed dual-fuel engine cylinder block according to claim 2, characterized in that, The mounting plate (7) is fixedly equipped with a second drive motor (15), and the side pressure plate (9) is equipped with a collar (16). A pressure rod (17) is movably inserted inside the collar (16), and the lower end of the pressure rod (17) is used to press against the lower sand core. The output shaft end of the second drive motor (15) is provided with a lifting plate (18), and the outer periphery of the lifting plate (18) is provided with an annular groove. The pressure rod (17) contacts the annular groove. The second drive motor (15) drives the pressure rod (17) to rise and fall in the vertical direction through the friction between the lifting plate (18) and the pressure rod (17).

6. The sand core anti-displacement positioning frame for casting a marine medium-speed dual-fuel engine cylinder block according to claim 5, characterized in that, The annular groove is provided with several locking blocks at equal intervals along the circumference of the lifting plate (18), and the pressure rod (17) is provided with several locking slots at equal intervals along its length direction. The locking blocks are used to limit the pressure rod (17).

7. The sand core anti-displacement positioning frame for casting a marine medium-speed dual-fuel engine cylinder block according to claim 6, characterized in that, The second drive motor (15) is a stepper motor with a self-locking function, which is used to maintain the position of the pressure rod (17) in the power-off state.

8. The sand core anti-displacement positioning frame for casting a marine medium-speed dual-fuel engine cylinder block according to claim 7, characterized in that, A mounting bracket (19) is fixedly provided on the pressure rod (17), and a rod (20) is provided on the mounting bracket (19). The upper pressure plate (8) is rotatably mounted on the mounting plate (7), and a return spring (21) is provided between the upper pressure plate (8) and the mounting plate (7). When the first rod (20) descends with the pressure rod (17), it pushes the upper pressure plate (8) to rotate downward, so that the upper pressure plate (8) presses the top of the sand core; when the first rod (20) rises with the pressure rod (17), the reset spring (21) drives the upper pressure plate (8) to rotate upward and reset.

9. The sand core anti-displacement positioning frame for casting a marine medium-speed dual-fuel engine cylinder block according to claim 8, characterized in that, A second rod (22) is rotatably mounted on the mounting bracket (19). A clamping plate (23) is fixedly provided at the lower end of the second rod (22). A third drive motor (24) for driving the second rod (22) to rotate is also fixedly provided on the mounting bracket (19). After the pressure rod (17) descends to the pressing position, the third drive motor (24) drives the second rod (22) to rotate, causing the clamping plate (23) to rotate below the rotating plate (5) to prevent the pressure rod (17) from retracting upwards.

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