A structure and method for increasing air venting in water jacket sand cores

Abstract

This invention relates to the field of water jacket sand core technology, and in particular to a structure and method for increasing venting in water jacket sand cores. Addressing the problems of slow venting speed and inconvenience in existing water jacket sand core venting structures, the present invention proposes the following solution: It includes a water jacket core and a venting mechanism. The water jacket core has multiple venting channels, and a large-sized auxiliary core head is fixed to the outlet of each venting channel. Each of the auxiliary core heads is equipped with a detachable external mold venting pin. The venting mechanism includes a fixed pipe, multiple connecting pipes, and multiple branch pipes fixed to the fixed pipe. This invention adds a large-sized auxiliary core head to the existing small core head structure, simultaneously creating venting channels for the sand outlet and thick structures. Combined with the external mold venting pins on the external mold, a "gas path" communicating with the outside is formed, allowing the large amount of gas generated by the water jacket sand core to be quickly discharged. At the same time, the venting mechanism greatly facilitates the assembly and disassembly of the external mold venting pins.

Description

Technical Field

[0001] This invention relates to the field of water jacket sand cores, and more particularly to a structure and method for increasing the venting of water jacket sand cores. Background Technology

[0002] In the production of automobile engine blocks, water-jacketed sand cores are often used for casting. Currently, water-jacketed sand cores generate a large amount of gas during casting. Because the outlet hole size of existing water-jacketed sand cores is relatively small, exhaust is often insufficient, increasing the probability of porosity defects in the water jacket.

[0003] However, the commonly used exhaust mechanisms are not convenient and quick to use. Therefore, this solution proposes a structure and method for adding exhaust to the water jacket sand core. Summary of the Invention

[0004] The present invention proposes a structure and method for increasing the venting speed of water jacket sand core, which solves the problems of slow venting speed and inconvenience of use in the existing water jacket sand core venting structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A structure and method for increasing the venting of a water jacket sand core includes a water jacket core and a venting mechanism. The water jacket core is provided with multiple venting channels, and a large-sized auxiliary core head is fixed to the venting outlet of each venting channel. Each of the multiple auxiliary core heads is equipped with a detachable outer mold venting pin.

[0007] The venting mechanism includes a fixed pipe, multiple connecting pipes, and multiple branch pipes fixed on the fixed pipe. The multiple connecting pipes are movably sleeved on the outside of multiple external mold venting pins, and a connecting cover is fixed at the bottom of the connecting pipe. A limit block is installed on the connecting cover to snap the connecting cover into the outside of the large-size auxiliary core head. One end of the multiple branch pipes is inserted into the inside of the multiple external mold venting pins.

[0008] An adjustment mechanism is installed on the fixed tube. The adjustment mechanism includes a rack for driving multiple connecting tubes to rotate synchronously and a clamping assembly for pressing multiple outer mold exhaust pins against a large-sized auxiliary core.

[0009] The above technical solution adds a large-sized auxiliary core to the existing small core structure and creates an exhaust channel for the sand outlet and thick structure. Combined with the external mold exhaust pin, an "air passage" that is connected to the outside is formed, which allows the large amount of gas generated by the water jacket sand core to be discharged quickly. At the same time, the exhaust mechanism also greatly facilitates the disassembly and assembly of the external mold exhaust pin.

[0010] As a further improvement to the above solution, two fixing rods are fixed at the bottom of the fixing tube, and mounting sleeves are fixed at the bottom of the two fixing rods. The two ends of the rack are respectively inserted into the two mounting sleeves and can slide within the mounting sleeves.

[0011] The above technical solution allows for the convenient simultaneous rotation of multiple connecting pipes.

[0012] As a further improvement to the above solution, a driving component for driving rack one to move is installed on the fixed tube. The driving component includes rack two fixed to the top of rack two, a rotating shaft installed on the fixed tube, and a fixed gear sleeved on the outside of the rotating shaft. The fixed gear meshes with rack two. An adjusting handle is fixed to one end of the rotating shaft.

[0013] The above technical solution allows for convenient and labor-saving movement of the rack and pinion, thereby facilitating the assembly and disassembly of the connecting cover and the large-sized auxiliary core.

[0014] As a further improvement to the above solution, a movable sleeve is movably fitted outside the connecting tube. A toothed ring is fixed at the bottom of the movable sleeve and movably fitted outside the connecting tube. A connecting ring is rotatably connected to the top of the movable sleeve and movably fitted outside the connecting tube. The toothed ring meshes with a rack. A locking bolt is threadedly connected to the outer circumference of the movable sleeve, and one end of the locking bolt abuts against the outer wall of the outer mold exhaust needle. A connecting rod is fixed to the outer circumference of the connecting ring and is fixedly connected to the outer circumference of the fixed tube.

[0015] The above technical solution allows for convenient adjustment of the connecting pipe position based on the height or position of the venting channel on the water jacket core.

[0016] As a further improvement to the above solution, a fixing plate is fixed to one end of the rack two, a positioning hole is opened on the top surface of the fixing block, and a positioning component for locking the fixing plate is installed on the fixing tube. The positioning component includes a mounting block fixed on the fixing tube and a positioning post movably set on the mounting block. A spring block located below the mounting block is sleeved on the outside of the positioning post, and a spring is movably sleeved on the outside of the positioning post. The spring is located between the mounting block and the spring block. The bottom of the positioning post abuts against the top surface of the fixing plate, and the positioning post matches the positioning hole. The top of the positioning post extends to the top of the mounting block and is fixed to the fixing block, and a pull ring is installed on the top of the fixing block.

[0017] The above technical solution can easily lock the rack and pinion, thereby preventing accidental rotation of the connecting pipe.

[0018] As a further improvement to the above solution, the clamping assembly includes a mounting plate and an abutment wheel sleeved on the outside of the rotating shaft. The mounting plate is movably sleeved on the outside of multiple outer mold venting pins, and multiple fixing bolts are threaded on the mounting plate to lock the multiple outer mold venting pins onto the mounting plate respectively. The abutment wheel is an incompletely round wheel, and the abutment wheel is located directly above the mounting plate and cooperates with it.

[0019] The above technical solution allows for easy pressing of the outer mold venting pin onto the large-size auxiliary core after the connecting cover is fixed.

[0020] As a further improvement to the above solution, the large-size auxiliary core head has a frustum-shaped structure, the connecting cover is provided on the outside of the large-size auxiliary core head and fits it, and the bottom of the outer ring of the large-size auxiliary core head has a groove for the limit block to pass through, and the limit block is engaged with the bottom of the large-size auxiliary core head.

[0021] The above technical solution facilitates the attachment of the connecting cover to the large-sized core head.

[0022] As a further improvement to the above solution, a fire-sealing asbestos pad is provided on the top of the large-size auxiliary core.

[0023] The above technical solution can enhance the airtightness when the outer mold venting pin and the large-size auxiliary core head are connected.

[0024] A method of using a structure for increasing air venting in a water jacket sand core includes the following steps:

[0025] S1. Place fire-sealing asbestos pads at the air outlets of the large-size auxiliary core head in sequence to ensure the airtightness of the connection between the outer mold venting pin and the large-size auxiliary core head.

[0026] S2. Adjust the venting mechanism according to the height of each venting channel of the water jacket core so that multiple outer mold venting pins can be pressed against the large-size auxiliary core head at the same time.

[0027] S3. Clip the connecting cover onto the large-size auxiliary core head, and then press the outer mold venting pin onto the large-size auxiliary core head, thereby installing the adjusted venting mechanism onto the water jacket core.

[0028] S4. Exhaust is complete. Remove the exhaust mechanism.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] 1. By adding a large-sized auxiliary core to the existing small core structure (which also facilitates the design of a large-sized venting pin for the outer mold), and by creating venting channels for the sand outlet and thick structures, combined with the venting pins of the outer mold, a "gas passage" that is connected to the outside is formed, allowing the large amount of gas generated by the water jacket sand core to be discharged quickly.

[0031] 2. The venting mechanism greatly facilitates the disassembly and assembly of the outer mold venting pin and the large-sized auxiliary core head, thereby reducing the difficulty of operation. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the exhaust gas path of the water jacket core sand core of the present invention;

[0033] Figure 2 for Figure 1 Medium and large-sized auxiliary cores and fire-sealing asbestos pads;

[0034] Figure 3 This is a front sectional view of the exhaust mechanism;

[0035] Figure 4 for Figure 3 Front view of the central exhaust mechanism;

[0036] Figure 5 for Figure 3 A schematic diagram of the structure of the central connecting cover and the large-size auxiliary core head;

[0037] Figure 6 for Figure 4 Top view of the mounting plate;

[0038] Figure 7 This is a structural diagram of the positioning component;

[0039] Figure 8 A schematic diagram of the structure of a water jacket sand core in the prior art.

[0040] Explanation of key symbols:

[0041] 1. Water jacket core; 2. Exhaust channel; 3. Fireproof asbestos gasket; 4. Large-size auxiliary core head; 5. Exhaust channel sealing core; 6. External mold exhaust pin; 7. Fixing pipe; 8. Branch pipe; 9. Connecting pipe; 10. Connecting cover; 11. Rotating shaft; 12. Rack one; 13. Gear ring; 14. Movable sleeve; 15. Locking bolt; 16. Mounting sleeve; 17. Fixing rod; 18. Positioning post; 19. Fixing plate; 20. Rack two; 21. Fixing gear; 22. Adjusting handle; 23. Positioning hole; 24. Pull ring; 25. Fixing bolt; 26. Mounting plate; 27. Abutment wheel; 28. Groove; 29. ​​Limiting block; 30. Mounting hole; 31. Mounting block; 32. Connecting ring; 33. Connecting rod. Detailed Implementation

[0042] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0043] Example 1:

[0044] Please combine Figure 1-2 ,and Figure 8 This embodiment of a structure for increasing the venting of a water jacket sand core includes a water jacket core 1. The water jacket core 11 is provided with multiple venting channels 2. A large-sized auxiliary core head 4 is fixed at the outlet of the venting channel 2. Each of the multiple auxiliary core heads 4 is equipped with a detachable outer mold venting needle 6. A fire-sealing asbestos pad 3 is provided on the top of the large-sized auxiliary core head 4. The outer mold venting needle 6 is sealed on the fire-sealing asbestos pad 3, thereby increasing the sealing performance. To prevent molten iron from entering the venting channel, a sealing sand core 5 is provided at the end of the venting channel.

[0045] The implementation principle of this embodiment is as follows: the small core head structure in the prior art is increased to a large-size auxiliary core head 4, then a fire-sealing asbestos pad 3 is placed at the end of the large-size auxiliary core head 4, and finally the outer mold exhaust pin 6 is aligned with the large-size auxiliary core head 4, so that the water jacket core forms an "air passage" that is connected to the outside world, so that a large amount of gas generated by the water jacket core 1 can be quickly discharged through the outer mold exhaust pin 6.

[0046] Example 2:

[0047] Combination Figure 3-7 This embodiment, based on embodiment 1, further improves upon the following: it also includes an exhaust mechanism, which comprises a fixed pipe 7, multiple connecting pipes 9, and multiple branch pipes 8 fixed on the fixed pipe 7. The multiple connecting pipes 9 are movably sleeved outside the multiple outer mold exhaust pins 6, and a connecting cover 10 is fixed to the bottom of each connecting pipe 9. A limiting block 29 is installed on the connecting cover 10 to engage with the outside of the large-size auxiliary core head 4. The large-size auxiliary core head 4 has a frustum-shaped structure, and the connecting cover 10 covers the outside of the large-size auxiliary core head 4 and is connected to... The large-size auxiliary core head 4 has a groove 28 at the bottom of its outer ring for the limit block 29 to pass through. The limit block 29 is engaged at the bottom of the large-size auxiliary core head 4. The number of grooves 28 and limit blocks 29 can be set to be multiple, but the number of both is the same and their positions need to correspond. The groove 28 is set so that when the connecting cover 10 is covered on the outside of the large-size auxiliary core head 4, the limit block 29 will not be stuck on the outer periphery of the large-size auxiliary core head 4, so that the limit block 29 can move through the groove 28 to the bottom of the outside of the large-size auxiliary core head 4.

[0048] One end of each of the multiple branch pipes 8 is inserted into the interior of multiple external mold venting pins 6, allowing the external mold venting pins 6 to slide freely outside the branch pipes 8;

[0049] An adjustment mechanism is installed on the fixed tube 7. The adjustment mechanism includes a rack 1 for driving multiple connecting tubes 9 to rotate synchronously and a clamping assembly for pressing multiple outer mold exhaust pins 6 onto a large-sized auxiliary core head 4. Two fixed rods 17 are fixed to the bottom of the fixed tube 7, and mounting sleeves 16 are fixed to the bottom of each of the two fixed rods 17. The two ends of the rack 12 are respectively inserted into the two mounting sleeves 16 and can slide within the mounting sleeves 16. A driving component for driving the rack 12 to move is installed on the fixed tube 7. The driving component includes a rack 20 fixed to the top of the rack 12, a rotating shaft 11 installed on the fixed tube 7, and a fixed gear 21 sleeved on the outside of the rotating shaft 11. The fixed gear 21 meshes with the rack 20. An adjustment handle 12 is fixed to one end of the rotating shaft 11. A movable sleeve 14 is movably sleeved on the outside of the connecting tube 9. The bottom of the movable sleeve 14 is fixed with a gear ring 13 that is movably sleeved outside the connecting tube 9. The top of the movable sleeve 14 is rotatably connected with a connecting ring 32 that is movably sleeved outside the connecting tube 9. The gear ring 13 meshes with the rack 12. The outer circumference of the movable sleeve 14 is threaded with a locking bolt 15, and one end of the locking bolt 15 abuts against the outer wall of the outer mold exhaust needle 6. The outer circumference of the connecting ring 32 is fixed with a connecting rod 33, and the connecting rod 33 is fixedly connected to the outer circumference of the fixed tube 7. Rotating the adjusting handle 12 can drive the fixed gear 21 to rotate. After the fixed gear 21 rotates, it can drive the rack 12 to move, which can drive the connecting tube 9 to rotate. This allows the limiting block 29 after passing through the groove 28 to rotate to a position that is offset from the groove 28 directly below it, so that it can be locked at the bottom of the large-size auxiliary core head 4.

[0050] One end of rack 20 is fixed with a fixing plate 19. The top surface of the fixing block 19 is provided with a positioning hole 23. A positioning component for locking the fixing plate 19 is installed on the fixing tube 7. The positioning component includes a mounting block 31 fixed on the fixing tube 7 and a positioning post 18 movably disposed on the mounting block 31. A spring clip located below the mounting block 31 is sleeved on the outside of the positioning post 18. A spring is movably sleeved on the outside of the positioning post 18. The spring is located between the mounting block 31 and the spring clip. The bottom of the positioning post 18 abuts against the top surface of the fixing plate 19, and the positioning post 18 matches the positioning hole 23. The top of the positioning post 18 extends above the mounting block 31 and is fixed with a fixing block. A pull ring 24 is installed on the top of the fixing block. By using the positioning post 18 to lock inside the positioning hole 23, the fixing plate 19 can be locked, so that the fixing gear 21 will not easily rotate, and the rack 12 will not easily move, thus ensuring the stability of the connection between the connecting cover 10 and the large-size auxiliary core head 4.

[0051] The clamping assembly includes a mounting plate 26 and an abutment wheel 27 sleeved on the outside of the rotating shaft 11. The mounting plate 26 is movably sleeved on the outside of multiple outer mold venting pins 6, and multiple fixing bolts 25 are threaded onto the mounting plate 26 to lock the multiple outer mold venting pins 6 onto the mounting plate 26 respectively. The mounting plate 26 has multiple mounting holes 30, and the outer mold venting pins 6 are installed in the mounting holes 30. The multiple fixing bolts are correspondingly arranged on one side of the mounting holes 30, and one end of the fixing bolts extends into the mounting hole 30 and engages with the outer mold venting pins 6. The outer wall of the outer mold venting pin 6 abuts against the mounting plate 26, which is marked with scale lines. The abutting wheel 27 is an incompletely round wheel and is located directly above the mounting plate 26 and cooperates with it. The outer ring of the abutting wheel 27 presses against the top surface of the mounting plate 26, thereby forcing the mounting plate 26 to descend. When the outer mold venting pin 6 is locked together with the mounting plate 26, the outer mold venting pin 6 will descend along with the mounting plate 26, so that the bottom of the outer mold venting pin 6 can be tightly attached to the large-size auxiliary core head 4.

[0052] The implementation principle of this embodiment is as follows: When installing the outer mold venting pin 6, the positions of multiple connecting sleeves 9 and the outer mold venting pin 6 are adjusted according to the height of the venting channel 2 on the water jacket core 1.

[0053] When adjusting the position of the connecting tube 9, loosen the locking bolt 15, and then move the connecting tube 9 up and down to adjust its position accordingly, so that multiple connecting covers 10 can be fixed on multiple large-sized auxiliary cores 4 at the same time. Then tighten the locking bolt 15. When adjusting the position of the outer mold venting pin 6, first loosen the fixing bolt 25, and then move the outer mold venting pin 6. Determine the relative position between the outer mold venting pin 6 and the connecting tube 9 according to the scale lines on the outer wall of the outer mold venting pin 6. After adjusting, tighten the fixing bolt 25.

[0054] Then, the multiple outer mold venting pins 6 can be aligned with the multiple venting channels 2 on the water jacket core 1, so that the outer mold venting pins 6 are connected to the venting channels 2. At the same time, the connecting cover 10 on the outside of the outer mold venting pins 6 is also covered on the outside of the large-sized auxiliary core head 4 at the top of the venting channel 2. The limiting block 29 on the inner wall of the connecting cover 10 is also moved to the bottom of the large-sized auxiliary core head 4 through the groove 28. Then, the adjusting handle 22 is held and rotated clockwise, so that the rotating shaft 11 rotates synchronously. After the rotating shaft 11 rotates, it drives the fixed gear 21 and the abutment wheel 27 to rotate synchronously. After the fixed gear 21 rotates, it drives the rack 20 to move to the left, which in turn drives the rack 12 to move to the left synchronously. After the rack 12 moves, it drives the multiple gear rings 13 to rotate synchronously. This causes multiple connecting pipes 19 to rotate synchronously, which in turn causes the limiting block 29 to deviate from the position directly below the groove 28. This allows the limiting block 29 to be engaged with the bottom of the large-size auxiliary core head 4. After the limiting block 29 deviates from the position directly below the groove 28, the outer ring of the abutment wheel 28 begins to contact the bottom surface of the mounting plate 26, thereby pressing the mounting plate 26 downward. This causes multiple outer mold venting pins 6 to be pressed against the top of the size auxiliary core head 4. The fixing plate 19 also moves with the movement of the rack 20. When the positioning hole 23 moves directly below the positioning pin 18, the positioning pin 18 is engaged into the positioning hole 23 under the action of the spring, thereby locking the fixing plate 19, and also locking the connecting pipe 9 and the outer mold venting pin 6.

[0055] Conversely, when disassembling the exhaust mechanism, first pull the positioning pin 18 out of the positioning hole 23, then turn the adjusting handle 22 counterclockwise to restore the rack 12 and the mounting plate 26 to their original positions, and then remove the connecting cover 10 from the large-size auxiliary core head 4.

[0056] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A structure for increasing venting of a water jacket sand core, comprising a water jacket core and a venting mechanism, wherein the water jacket core is provided with multiple venting channels, characterized in that, The exhaust channel has a large-sized auxiliary core fixed at its outlet, and each of the auxiliary cores is equipped with a detachable outer mold exhaust pin. The venting mechanism includes a fixed pipe, multiple connecting pipes, and multiple branch pipes fixed on the fixed pipe. The multiple connecting pipes are movably sleeved on the outside of multiple external mold venting pins, and a connecting cover is fixed at the bottom of the connecting pipe. A limit block is installed on the connecting cover to snap the connecting cover into the outside of the large-size auxiliary core head. One end of the multiple branch pipes is inserted into the inside of the multiple external mold venting pins. An adjustment mechanism is installed on the fixed tube. The adjustment mechanism includes a rack for driving multiple connecting tubes to rotate synchronously and a clamping assembly for pressing multiple outer mold exhaust pins against a large-sized auxiliary core. The fixed tube is equipped with a driving component for moving rack one. The driving component includes rack two fixed to the top of rack two, a rotating shaft mounted on the fixed tube, and a fixed gear sleeved on the outside of the rotating shaft. The fixed gear meshes with rack two. One end of the rotating shaft is fixed with an adjusting handle, and one end of rack two is fixed with a fixed plate. A positioning hole is opened on the top surface of the fixed block. The fixed tube is equipped with a positioning assembly for locking the fixed plate. The positioning assembly includes a mounting block fixed on the fixed tube and a positioning post movably mounted on the mounting block. A spring block located below the mounting block is sleeved on the outside of the positioning post. A spring is movably sleeved on the outside of the positioning post. The spring is located between the mounting block and the spring block. The bottom of the positioning post abuts against the top surface of the fixed plate, and the positioning post matches the positioning hole. The top of the positioning post extends above the mounting block and is fixed with a fixed block. A pull ring is installed on the top of the fixed block. The clamping assembly includes a mounting plate and an abutment wheel sleeved on the outside of the rotating shaft. The mounting plate is movably sleeved on the outside of multiple outer mold venting pins, and multiple fixing bolts are threaded on the mounting plate to lock the multiple outer mold venting pins onto the mounting plate respectively. The abutment wheel is an incompletely round wheel, and the abutment wheel is located directly above the mounting plate and cooperates with it.

2. The structure for increasing air venting in a water jacket sand core according to claim 1, characterized in that, Two fixing rods are fixed at the bottom of the fixing tube, and each fixing rod has a mounting sleeve fixed at its bottom. The two ends of the rack are respectively inserted into the two mounting sleeves and can slide within the mounting sleeves.

3. The structure for increasing air venting in a water jacket sand core according to claim 1, characterized in that, The connecting tube is movably fitted with a movable sleeve. A toothed ring is fixed at the bottom of the movable sleeve and movably fitted outside the connecting tube. A connecting ring is rotatably connected at the top of the movable sleeve and movably fitted outside the connecting tube. The toothed ring meshes with a rack. A locking bolt is threadedly connected to the outer circumference of the movable sleeve, and one end of the locking bolt abuts against the outer wall of the outer mold exhaust pin. A connecting rod is fixed to the outer circumference of the connecting ring and is fixedly connected to the outer circumference of the fixed tube.

4. The structure for increasing air venting in a water jacket sand core according to claim 1, characterized in that, The large-size auxiliary core has a frustum-shaped structure. The connecting cover is placed over the large-size auxiliary core and fits it. The bottom of the outer ring of the large-size auxiliary core has a groove for the limiting block to pass through. The limiting block is engaged with the bottom of the large-size auxiliary core.

5. The structure for increasing air venting in a water jacket sand core according to claim 1, characterized in that, The top of the large-sized auxiliary core head is equipped with a fire-sealing asbestos pad.

6. A method of using the structure for increasing air venting in a water jacket sand core according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Place the fire-sealing asbestos pads at the air outlet of the large-size auxiliary core head in sequence; S2. Adjust the exhaust mechanism according to the height of each exhaust channel of the water jacket core; S3. Install the adjusted exhaust mechanism onto the water jacket core; S4. Exhaust is complete. Remove the exhaust mechanism.

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