A casting production mold and process for combined counterweight

Abstract

The present invention belongs to the field of metal casting technology, and in particular relates to a casting production mold for a combined counterweight, comprising an air pipe that passes through the air chamber of a sand box, and a cross-section adjusting member for adjusting the cross-sectional area of ​​gas flow in the air pipe; the cross-section adjusting member comprises: a shell, the air pipe passes through the shell, and there is a gap A between one end of the air pipe and the inner wall of the shell, and a through groove 1 is provided at the position of the air pipe corresponding to the gap A; an adjusting plate arranged inside the shell, the adjusting plate is located inside the air pipe and has a gap B for gas flow between the end thereof and the inner wall of the air pipe; a screw; and a rotatably arranged screw sleeve. A casting production mold for a combined counterweight in this technical solution adjusts the cross-sectional area of ​​gas flow in the air pipe according to different positions of the sand box, so that the air extraction volume in the entire sand mold remains consistent, thereby ensuring the consistency of the air extraction volume of the entire sand mold, making the hardness of the sand mold consistent, and avoiding deformation of the casting.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal casting, and in particular relates to a casting production mold for a combined counterweight, and a production process of the casting production mold for the combined counterweight. Background Art

[0002] When the combined counterweight is made by V-casting, it has the advantages of smooth casting surface, clear outline and accurate size. However, V-casting requires vacuuming the sand box to keep the sand mold at a certain strength.

[0003] When the width of the sand box is greater than 1220mm, the side wall exhaust pipe can no longer meet the vacuum requirements to reach all areas of the sand mold, resulting in inconsistent sand mold strength. The main manifestation is that the farther away from the exhaust port, the lower the sand mold strength. Inconsistent sand mold strength will lead to deformation of the casting.

[0004] For this, a casting production mold of a combined counterweight and a production process of the casting production mold of the combined counterweight are designed. Summary of the Invention

[0005] The present invention aims to solve the problems in the prior art and proposes the following technical solutions:

[0006] A casting production mold for a combined counterweight, comprising an air pipe communicating with a sand box air chamber and a cross-section adjusting member for adjusting the cross-sectional area of ​​gas flow in the air pipe; the cross-section adjusting member comprises:

[0007] The air pipe passes through the housing, and a gap A is formed between one end of the air pipe and the inner wall of the housing. A through groove 1 is formed on the air pipe at a position corresponding to the gap A;

[0008] An adjustment plate is disposed inside the housing, the adjustment plate passing through the through slot 1 and slidingly sealingly engaging with the through slot 1, and a gap B for gas circulation is defined between one end of the adjustment plate located inside the trachea and the inner wall of the trachea;

[0009] a screw rod connected to one end of the adjustment plate located outside the trachea;

[0010] A rotatably arranged screw sleeve, the screw sleeve being engaged with the screw thread, the screw sleeve being movable through the top of the shell and extending to the outside of the shell;

[0011] The screw sleeve is rotated, and the screw drives the end of the adjustment plate located inside the trachea to move closer to or away from the inner wall of the trachea, thereby adjusting the height value of the gap B.

[0012] As a preferred embodiment of the above technical solution, the mold is used for the assembly production of combined balancing weights, the combined balancing weights include an upper balancing weight and a lower balancing weight, the sand box includes an upper sand box and a lower sand box distributed in the upper and lower directions, and sand molds are provided in the upper and lower sand boxes. The sand mold in the upper sand box is provided with an upper mold cavity, and the sand mold in the lower sand box is provided with a lower mold cavity. The upper mold cavity and the lower mold cavity form a complete mold cavity, and the mold cavity includes a mold cavity A that matches the upper balancing weight and a mold cavity B that matches the lower balancing weight.

[0013] As a preferred embodiment of the above technical solution, the screw sleeve is located inside the gap A and is rotated with an annular plate. The outer ring of the annular plate extends radially outward to form a slider. A limiting groove that slides with the slider is provided on the side wall of the shell, and the slider is equipped with an electric push rod arranged along the height direction of the adjustment plate.

[0014] As a preferred embodiment of the above technical solution, the limiting groove has a first contact surface and a second contact surface, the second contact surface is provided with a groove body 1, and the electric push rod is assembled inside the groove body 1;

[0015] When the screw and the sleeve are at their initial positions and the slider contacts the second contact surface, the height of the gap B is 0;

[0016] The screw rod and the screw sleeve are located at the initial positions, and when the slider contacts the first contact surface, the height value of the gap B is consistent with the height value of the air pipe.

[0017] As a preferred embodiment of the above technical solution, the screw sleeve and the annular plate are mechanically rotated and sealed, and a sealing ring is provided on the end surface of the annular plate. When the slider contacts the first contact surface, the sealing ring is squeezed and deformed by the annular plate and the housing, and the housing remains in a sealed state.

[0018] Two relatively distributed slide rails are arranged on the outside of the trachea, and the adjustment plate is located between the two slide rails and slidably cooperates with the two slide rails.

[0019] As a preferred embodiment of the above technical solution, a gas filter is further included, wherein the gas filter includes a filter screen, a first permanent magnet provided at the lower end of the adjustment plate, a second permanent magnet provided at the upper end of the filter screen, and an electromagnet provided at the lower end of the filter screen, wherein the magnetic properties of the first permanent magnet and the electromagnet are consistent, and the magnetic properties of the second permanent magnet are opposite to those of the first permanent magnet;

[0020] A first armature is provided on the end surface of the annular plate, and a second armature is provided on the top wall of the housing. When the slider is not in contact with the first contact surface, the second permanent magnet and the first permanent magnet are attracted to each other, and the filter screen moves and expands along with the adjustment plate.

[0021] When the slider contacts the first contact surface, the first armature contacts the second armature, and the electromagnet is energized to generate magnetic force to attract the second permanent magnet, and the filter is retracted.

[0022] As a preferred embodiment of the above technical solution, the adjustment plate is provided with a second slot body for accommodating the first permanent magnet and the upper end of the filter screen, and the air pipe is provided with a second slot for accommodating the electromagnet and the lower end of the filter screen at a position opposite to the first slot.

[0023] The second through groove passes through the side wall of the air pipe, and the electromagnet is installed on the sealing plate of the shell. The sealing plate and the shell are detachably assembled.

[0024] As a preferred embodiment of the above technical solution, the outer ring side wall of the screw sleeve is annularly distributed with axially opened tooth grooves, the tooth grooves are engaged with gears, the gears are connected to the motor, and the motor is installed on the top of the shell.

[0025] As a preferred embodiment of the above technical solution, one end of the screw extends to the outside of the screw sleeve and is connected to a top cover, and a distance sensor is provided on the top cover. The distance sensor is opposite to the top of the shell, and the distance sensor detects the distance between the top cover and the top of the shell to determine the height value of the gap B.

[0026] A production process for a casting production mold for a combined counterweight, comprising adjusting the gas flow cross-sectional area in a gas pipe according to different positions of a sand box, comprising the following steps:

[0027] S1. During molding, determine the gas flow cross-sectional area required by the air pipes at different positions of the sand box according to the different local shapes of the product;

[0028] S2. According to the gas flow cross-sectional area required by the trachea, rotate the screw sleeve. The screw drives the end of the adjustment plate located inside the trachea to move closer to or away from the inner wall of the trachea to adjust the height value of the gap B.

[0029] The beneficial effects of the present invention are:

[0030] 1. A combined counterweight casting production mold in this technical solution adjusts the gas flow cross-sectional area in the air pipe according to different positions of the sand box, so that the air extraction volume in the entire sand mold remains consistent. By ensuring the consistency of the air extraction volume of the entire sand mold, the hardness of the sand mold is made consistent, avoiding deformation of the casting.

[0031] At the same time, this technical solution matches the threads of the screw sleeve with the screw rod to drive the adjustment plate to move, thereby changing the height value of the gap B, thereby achieving the purpose of adjusting the gas flow cross-sectional area in the trachea with high adjustment accuracy.

[0032] 2. In this embodiment, a casting production mold for a combined counterweight is used to cast the upper and lower counterweights simultaneously in the same mold, that is, the combined counterweights are produced in a box. This can ensure that the pouring temperature, molten iron composition and cooling conditions of the upper and lower counterweights in the same mold are consistent, and can ensure the dimensional consistency of the upper and lower counterweights, which can better meet the assembly size requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The figure shows a schematic structural diagram of a casting production mold for a combined balancing weight in Example 1;

[0034] Figure 2 The figure shows a side cross-sectional view of the air pipe and the cross-section adjusting member in embodiment 1, wherein the screw and the screw sleeve are in the initial state, and the value of the gap B is greater than 0;

[0035] Figure 3 The figure shows a side cross-sectional view of the air pipe and the cross-section adjusting member in embodiment 1, wherein the screw and the screw sleeve are in an initial state, the gap B is greater than 0, and the slider is in contact with the first contact surface;

[0036] Figure 4 Shown is a schematic structural diagram of the trachea in Example 1;

[0037] Figure 5 The figure shows a schematic top view of the annular plate in Example 1;

[0038] Figure 6 Shown is a schematic structural diagram of the gas filter in Example 1;

[0039] Figure 7 The figure shows the upper box model diagram of the combined counterweight box production in Example 1;

[0040] Figure 8 Shown is a diagram of the lower box model for the combined counterweight box assembly production in Example 1.

[0041] Figure numerals: 10, air pipe; 11, through slot one; 12, through slot two; 13, slide rail; 20, housing; 21, limit slot; 211, first contact surface; 212, second contact surface; 22, slot body one; 23, blocking plate; 30, adjustment plate; 31, slot body two; 40, screw; 41, top cover; 42, distance sensor; 50, screw sleeve; 51, tooth groove; 52, gear; 53, motor; 60, annular plate; 61, slider; 62, first armature; 63, second armature; 64, sealing ring; 70, electric push rod; 80, gas filter; 81, filter screen; 82, first permanent magnet; 83, second permanent magnet; 84, electromagnet. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0043] Example 1

[0044] When the flask width is greater than 1220mm, the sidewall exhaust pipes can no longer provide vacuum to all areas of the sand mold, resulting in inconsistent sand mold strength. This is mainly manifested in the fact that the farther away from the exhaust port, the lower the sand mold strength. Inconsistent sand mold strength can lead to casting deformation. To address this, the flask was further optimized and the pipes at different locations in the flask were restricted, so that the exhaust volume throughout the entire sand mold is consistent, thus ensuring the consistency of the exhaust volume throughout the entire sand mold.

[0045] like Figure 1 、 Figure 2 、 Figure 3 As shown, a casting production mold for a combined counterweight includes an air pipe 10 that penetrates the air chamber of the sand box and a cross-section adjusting member for adjusting the cross-sectional area of ​​gas flow in the air pipe 10; the cross-section adjusting member includes:

[0046] The housing 20 has an air pipe 10 extending through it, with a gap A defined between one end of the air pipe 10 and the inner wall of the housing 20. The air pipe 10 has a through groove 11 defined at a position corresponding to the gap A.

[0047] An adjustment plate 30 is disposed within the housing 20. The adjustment plate 30 extends through the through-slot 11 and is in sliding and sealing engagement with the through-slot 11. A gap B for gas flow is defined between one end of the adjustment plate 30 located within the trachea 10 and the inner wall of the trachea 10.

[0048] a screw rod 40 connected to one end of the adjustment plate 30 located outside the air pipe 10;

[0049] The screw sleeve 50 is rotated and threadedly engaged with the screw rod 40. The screw sleeve 50 is movable through the top of the housing 20 and extends to the outside of the housing 20.

[0050] The screw sleeve 50 is rotated, and the screw 40 drives the end of the adjustment plate 30 located inside the trachea 10 to move closer to or away from the inner wall of the trachea 10, thereby adjusting the height value of the gap B. Specifically, the screw sleeve 50 is rotated in the forward direction, and the screw 40 drives the end of the adjustment plate 30 located inside the trachea 10 to move closer to the inner wall of the trachea 10, thereby reducing the height value of the gap B and reducing the gas flow cross-sectional area in the trachea 10.

[0051] The screw sleeve 50 rotates in the opposite direction, and the screw rod 40 drives the end of the adjustment plate 30 located inside the trachea 10 away from the inner wall of the trachea 10, thereby increasing the height value of the gap B and increasing the gas flow cross-sectional area in the trachea 10.

[0052] A production process for a combined counterweight casting mold includes adjusting the gas flow cross-sectional area in a gas pipe 10 according to different positions of a sand box, including the following steps:

[0053] S1. During molding, determine the gas flow cross-sectional area required by the air pipe 10 at different positions of the sand box according to the different local shapes of the product;

[0054] The calculation of the gas flow cross-sectional area required by the trachea 10 is as follows:

[0055] According to the distance of the sand mold, the sand mold strength is controlled by controlling the air extraction volume in the sand mold cavity. The air extraction volume S=1.1(V 气 / t)ln(P0 / P);

[0056] Where S is the pumping volume per unit time, 1.1 is a constant, and V 气 is the volume of air in the sand mold, t is the time required for the sand mold to reach the working pressure, P0 is the pressure in the sand box when the vacuum starts, and P is the working pressure.

[0057] According to general production experience, the working pressure is reached within 5 to 10 seconds. For the convenience of calculation, t is taken as 6 seconds, i.e. 0.1 min. The pressure in the sand box at the beginning of the vacuum is the atmospheric pressure, P0 is 101.3 kPa, and the working pressure P is 40 kPa. Substituting the above data into the formula, we can get: S=1.1(V 气 / 0.1) ln(101.3 / 40) ≈10 V 气 ;

[0058] That is, the air extraction volume is about 10 times the volume of the air in the sand mold. Although the AFS particle size of the casting sand is different, the volume of the gap between the sand particles is about 30% of the total volume, that is, the volume is V 型 There is about 0.3 V in the sand mold 型 Volume of air, so S≈3V in the above formula 型 .

[0059] Pumping volume S=vπ( ) 2 ; launch d = Where: S is the air extraction volume per unit time, v is the air flow velocity in the trachea, and d is the diameter of the trachea. In V-method casting, the air flow velocity v in the trachea is generally 1200m / min.

[0060] Set S≈3V 型 Substituting the above formula, the diameter of the air pipe can be calculated based on the volume of the sand mold.

[0061] The following table shows the air pipe diameter required for the sand mold volume at different parts of the counterweight calculated according to the above formula.

[0062]

[0063] The trachea diameter in the above formula refers to a circular tube. The gas flow cross-sectional area is obtained by solving the formula based on the value of the circular tube diameter and the area of ​​the circle.

[0064] S2. According to the required gas flow cross-sectional area of ​​the trachea 10, the screw sleeve 50 is rotated, and the screw 40 drives the end of the adjustment plate 30 located inside the trachea 10 to move closer to or away from the inner wall of the trachea 10, thereby adjusting the height value of the gap B;

[0065] The gas pipe in this embodiment is a square tube. If the gas flow cross-sectional area and the width of the square tube are known, the height of the gap B can be obtained by solving the formula based on the area of ​​the rectangle.

[0066] A combined counterweight casting production mold in the present technical solution adjusts the gas flow cross-sectional area in the air pipe 10 according to different positions of the sand box, so that the exhaust volume in the entire sand mold remains consistent. By ensuring the consistency of the exhaust volume of the entire sand mold, the hardness of the sand mold is made consistent, avoiding deformation of the casting.

[0067] At the same time, this technical solution matches the threads of the screw sleeve 50 with the screw rod 40 to drive the adjustment plate 30 to move, thereby changing the height value of the gap B, thereby achieving the purpose of adjusting the gas flow cross-sectional area in the air pipe 10 with high adjustment accuracy.

[0068] In the production of balancing weights in the existing technology, due to the design requirements of appearance and manufacturing process, for example, when the width of the sand box is greater than 1220mm, the side wall exhaust pipe can no longer meet the vacuum requirements to reach all areas of the sand mold, resulting in the problem of inconsistent sand mold hardness. The balancing weight is designed to be assembled and installed in combination with an upper and lower balancing weight. When the upper and lower balancing weights are cast, the upper and lower balancing weights are cast separately. However, since the pouring temperature and molten iron composition of each box of balancing weights are different, the solidification shrinkage conditions of each balancing weight are inconsistent. The dimensional consistency of the upper and lower balancing weights produced is poor, and the requirements of concentric assembly holes, consistent width, and uniform fitting clearances cannot be met when the upper and lower balancing weights are installed. Manual polishing and other methods are required to ensure that the product dimensional accuracy meets the design requirements, which increases the difficulty of production.

[0069] The mold in this embodiment can ensure that when the width of the sand box is greater than 1220mm, the air extraction volume in the entire sand mold remains consistent, thereby ensuring the consistency of the air extraction volume of the entire sand mold. Figure 1 、 Figure 7 、 Figure 8As shown, the mold in this embodiment is used for the production of combined balancing weights for containerization. The combined balancing weights include an upper balancing weight and a lower balancing weight. The sand box includes an upper sand box and a lower sand box distributed in the upper and lower directions. Sand molds are provided in the upper and lower sand boxes. An upper mold cavity is provided on the sand mold in the upper sand box. The specific shape of the upper mold cavity is as shown in FIG. Figure 7 As shown in the upper box model, the sand mold in the lower sand box is provided with a lower cavity. The specific shape of the lower cavity is as follows Figure 8 As shown in the lower box model in FIG, the upper cavity and the lower cavity form a complete cavity, and the cavity includes cavity A that matches the upper balance weight and cavity B that matches the lower balance weight.

[0070] In this embodiment, a casting production mold for a combined balancing weight is used to cast the upper and lower balancing weights simultaneously in the same mold, that is, the combined balancing weights are produced in a box. This can ensure that the pouring temperature, molten iron composition and cooling conditions of the upper and lower balancing weights in the same mold are consistent, and can ensure the dimensional consistency of the upper and lower balancing weights, which can better meet the assembly size requirements.

[0071] like Figure 2 、 Figure 3 As shown, a section of the screw sleeve 50 located inside the gap A is rotatably engaged with an annular plate 60, and the outer ring of the annular plate 60 extends radially outward to form a slider 61. A limiting groove 21 that slides with the slider 61 is provided on the side wall of the shell 20, and the slider 61 is equipped with an electric push rod 70 arranged along the height direction of the adjustment plate 30; the overall length of the electric push rod 70 is extended, and the annular plate 60, the screw sleeve 50, the screw 40, and the adjustment plate 30 are driven to move upward through the slider 61, and the overall length of the electric push rod 70 is shortened, and the annular plate 60, the screw sleeve 50, the screw 40, and the adjustment plate 30 are driven to move downward through the slider 61.

[0072] In this technical solution, when the inside of the sand box is vacuumed, the threaded sleeve 50 and the screw 40 are used to cooperate to drive the adjustment plate 30 to move, so as to change the height value of the gap B, thereby achieving the purpose of adjusting the gas flow cross-sectional area in the air pipe 10 and precise adjustment; when the casting is completed and the product needs to be taken out, the sand mold is quickly destroyed, and gas is introduced into the sand box, the overall length of the electric push rod 70 is extended to drive the adjustment plate 30 and other structures to move upward quickly, so as to achieve the purpose of rapid gas injection and destruction of the sand mold.

[0073] like Figure 2 、 Figure 3 、 Figure 4 As shown, the limiting groove 21 has a first contact surface 211 and a second contact surface 212 , and a groove body 22 is opened on the second contact surface 212 . The electric push rod 70 is assembled inside the groove body 22 , and the electric push rod 70 is assembled in a hidden manner.

[0074] The initial position in this embodiment is the relative position when the upper end of the screw sleeve 50 contacts the lower end of the top cover 41. The screw 40 and the screw sleeve 50 are in the initial position. When the slider 61 contacts the second contact surface 212, the height value of the gap B is 0, that is, the gas flow cross-sectional area in the trachea 10 is 0, and the trachea 10 is completely closed; the screw 40 and the screw sleeve 50 are in the initial position. When the slider 61 contacts the first contact surface 211, the height value of the gap B is consistent with the height value of the trachea 10, that is, the gas flow cross-sectional area in the trachea 10 is the cross-sectional area of ​​the trachea 10, and the trachea 10 is completely open; the purpose of quickly opening or closing the adjustment plate 30 is achieved.

[0075] It is known that when the height value of the gap B is not 0, the electric push rod 70 drives the adjustment plate 30 and other structures to move upward quickly, and the adjustment plate 30 is separated from the through groove 11. At this time, the sealing state of the trachea 10 is broken. Figure 2 、 Figure 3 、 Figure 4 As shown, the screw sleeve 50 and the annular plate 60 are mechanically rotated and sealed to ensure that the annular plate 60 and the screw sleeve 50 are in a sealed connection. A sealing ring 64 is provided on the end face of the annular plate 60. When the slider 61 contacts the first contact surface 211, the sealing ring 64 is squeezed and deformed by the annular plate 60 and the shell 20, and the shell 20 is kept in a sealed state to avoid gas leakage during the vacuum operation, which affects the strength of the sand mold, and to avoid gas leakage when the sand mold is destroyed, which affects the gas delivery amount and thus affects the destructive strength.

[0076] When the adjustment plate 30 is disengaged from the through slot 11, the circumferential position of the adjustment plate 30 is not limited, and there is a problem of rotation. To this end, two relatively distributed slide rails 13 are provided on the outside of the trachea 10. The adjustment plate 30 is located between the two slide rails 13 and slides with them to ensure that the circumferential position of the adjustment plate 30 is always limited and there is no problem of rotation.

[0077] The combined counterweight is cast using the V method. During casting, the molten metal will react chemically with the sealing film and sand mold to produce harmful gases. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 As shown, a casting production mold for a combined counterweight also includes a gas filter 80. The gas filter 80 is set to filter the harmful gases generated during the casting process during the vacuum operation, thereby reducing the damage caused by the harmful gases. At this time, the shell 20 is always kept in a sealed state, which can effectively prevent the leakage of harmful gases.

[0078] The gas filter 80 includes a filter 81, on which an adsorption element for adsorbing harmful gases is provided, a first permanent magnet 82 arranged at the lower end of the adjustment plate 30, a second permanent magnet 83 arranged at the upper end of the filter 81 and an electromagnet 84 arranged at the lower end of the filter 81, wherein the magnetic properties of the first permanent magnet 82 are consistent with those of the electromagnet 84, and the magnetic properties of the second permanent magnet 83 are opposite to those of the first permanent magnet 82.

[0079] A first armature 62 is provided on the end face of the annular plate 60, and a second armature 63 is provided on the top wall of the shell 20. When the vacuum operation is performed, the slider 61 does not conflict with the first contact surface 211, the second permanent magnet 83 and the first permanent magnet 82 are adsorbed, the filter 81 moves and expands with the adjustment plate 30, and the adsorption part on the filter 81 adsorbs the harmful gas; when gas is supplied to the inside of the sand box to destroy the sand mold, the slider 61 conflicts with the first contact surface 211, the first armature 62 contacts the second armature 63, the electromagnet 84 is energized to generate magnetic force to adsorb the second permanent magnet 83, and the filter 81 is retracted, which does not affect the gas supply work.

[0080] like Figure 6 As shown, a second slot 31 for accommodating the first permanent magnet 82 and the upper end of the filter 81 is provided on the adjustment plate 30, and a second through slot 12 for accommodating the electromagnet 84 and the lower end of the filter 81 is provided at a position opposite to the through slot 1 11 of the air pipe 10; the first permanent magnet 82, the filter 81, the second permanent magnet 83 and the electromagnet 84 are effectively accommodated to avoid a gap between the adjustment plate 30 and the inner bottom wall of the air pipe 10, which affects the cross-sectional area of ​​the gas flow in the air pipe 10.

[0081] The second through groove 12 passes through the side wall of the air pipe 10, and the electromagnet 84 is installed on the sealing plate 23 of the shell 20. The sealing plate 23 and the shell 20 can be detachably assembled, so that the filter 81 can be replaced, which is convenient for replacing the filter 81 that is saturated with adsorption.

[0082] In order to improve the convenience of controlling the rotation of the screw sleeve 50, as Figure 2 、 Figure 3As shown, the outer ring side wall of the screw sleeve 50 is annularly distributed with axially opened tooth grooves 51, and the tooth grooves 51 are engaged with gears 52, and the gear 52 is connected to a motor 53, and the motor 53 is installed on the top of the housing 20; the motor 53 is a servo motor, which can realize forward and reverse rotation. Under the premise that the slider 61 slides with the limit groove 21, the motor 53 is energized, and the screw sleeve 50 is driven to rotate through the gear 52 and the tooth groove 51. Specifically, when the motor 53 drives the gear 52 to rotate forward, the screw sleeve 50 rotates in the opposite direction, driving the screw rod 40 and the adjusting plate 30 to move upward, increasing the height value of the gap B; when the motor 53 drives the gear 52 to rotate in the opposite direction, the screw sleeve 50 rotates in the positive direction, driving the screw rod 40 and the adjusting plate 30 to move downward, reducing the height value of the gap B; wherein, the tooth groove 51 is axially arranged on the outer ring side wall of the screw sleeve 50, meeting the setting that the screw sleeve 50 needs to move in the up and down directions.

[0083] In order to further accurately determine the cross-sectional area of ​​the gas flow in the air pipe 10 and ensure the casting quality of the combined balancing weight, Figure 2 、 Figure 3 As shown, one end of the screw 40 extends to the outside of the screw sleeve 50 and is connected to a top cover 41. A distance sensor 42 is provided on the top cover 41. The distance sensor 42 is opposite to the top of the shell 20. Under the premise that the slider 61 contacts the first contact surface 211, the distance sensor 42 detects the distance between the top cover 41 and the top of the shell 20, that is, the distance between the adjustment plate 30 and the bottom wall of the trachea 10, and determines the height value of the gap B.

[0084] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. A production process for a casting production mold of a combined balancing weight, characterized in that: The method includes adjusting the gas flow cross-sectional area in the air pipe according to different positions of the sand box, including the following steps: S1. During molding, determine the gas flow cross-sectional area required by the air pipes at different positions of the sand box according to the different local shapes of the product; S2. According to the required gas flow cross-sectional area of ​​the trachea, rotate the screw sleeve. The screw drives the end of the adjustment plate located inside the trachea to move closer to or away from the inner wall of the trachea to adjust the height value of the gap B. The casting production mold of the combined counterweight comprises an air pipe communicating with the air chamber of the sand box and a cross-section adjusting member for adjusting the cross-sectional area of ​​gas flow in the air pipe; the cross-section adjusting member comprises: The air pipe passes through the housing, and a gap A is formed between one end of the air pipe and the inner wall of the housing. The air pipe is provided with a through groove 1 at a position corresponding to the gap A; An adjustment plate is disposed inside the housing, the adjustment plate passing through the through slot 1 and slidingly sealingly engaging with the through slot 1, and a gap B for gas circulation is defined between one end of the adjustment plate located inside the trachea and the inner wall of the trachea; a screw rod connected to one end of the adjustment plate located outside the trachea; A rotatably arranged screw sleeve, the screw sleeve being engaged with the screw thread, the screw sleeve being movable through the top of the shell and extending to the outside of the shell; The screw sleeve is rotated, and the screw drives the end of the adjustment plate located inside the trachea to move closer to or away from the inner wall of the trachea, thereby adjusting the height value of the gap B; The casting production mold of the combined balancing weight is used for the assembly and production of the combined balancing weight. The combined balancing weight includes an upper balancing weight and a lower balancing weight. The sand box includes an upper sand box and a lower sand box distributed in the upper and lower directions. Sand molds are provided in the upper and lower sand boxes. An upper mold cavity is provided on the sand mold in the upper sand box, and a lower mold cavity is provided on the sand mold in the lower sand box. The upper mold cavity and the lower mold cavity form a complete mold cavity, and the mold cavity includes a mold cavity A that matches the upper balancing weight and a mold cavity B that matches the lower balancing weight.

2. The production process of a casting production mold for a combined counterweight according to claim 1, characterized in that: The screw sleeve is located inside the gap A and is rotatably engaged with an annular plate. The outer ring of the annular plate extends radially outward to form a slider. A limiting groove that slides with the slider is provided on the side wall of the shell. The slider is equipped with an electric push rod arranged along the height direction of the adjustment plate.

3. The production process of a casting production mold for a combined counterweight according to claim 2, characterized in that: The limiting groove has a first contact surface and a second contact surface, the second contact surface is provided with a groove body 1, and the electric push rod is assembled inside the groove body 1; When the screw and the sleeve are at their initial positions and the slider contacts the second contact surface, the height of the gap B is 0; The screw rod and the screw sleeve are located at the initial positions, and when the slider contacts the first contact surface, the height value of the gap B is consistent with the height value of the air pipe.

4. The production process of a casting production mold for a combined counterweight according to claim 3, characterized in that: The screw sleeve and the annular plate are mechanically rotated and sealed together. A sealing ring is provided on the end surface of the annular plate. When the slider contacts the first contact surface, the sealing ring is squeezed and deformed by the annular plate and the housing, and the housing remains in a sealed state. Two relatively distributed slide rails are arranged on the outside of the trachea, and the adjustment plate is located between the two slide rails and slidably cooperates with the two slide rails.

5. The production process of a casting production mold for a combined counterweight according to claim 2, characterized in that: The device further comprises a gas filter, the gas filter comprising a filter screen, a first permanent magnet disposed at the lower end of the adjustment plate, a second permanent magnet disposed at the upper end of the filter screen, and an electromagnet disposed at the lower end of the filter screen, wherein the magnetic properties of the first permanent magnet and the electromagnet are consistent, and the magnetic properties of the second permanent magnet are opposite to those of the first permanent magnet; A first armature is provided on the end surface of the annular plate, and a second armature is provided on the top wall of the housing. When the slider is not in contact with the first contact surface, the second permanent magnet and the first permanent magnet are attracted to each other, and the filter screen moves and expands along with the adjustment plate. When the slider contacts the first contact surface, the first armature contacts the second armature, and the electromagnet is energized to generate magnetic force to attract the second permanent magnet, and the filter is retracted.

6. The production process of a casting production mold for a combined counterweight according to claim 5, characterized in that: The adjustment plate is provided with a second slot body for accommodating the first permanent magnet and the upper end of the filter screen, and the air pipe is provided with a second slot for accommodating the electromagnet and the lower end of the filter screen at a position opposite to the first slot. The second through groove passes through the side wall of the air pipe, and the electromagnet is installed on the sealing plate of the shell. The sealing plate and the shell are detachably assembled.

7. The production process of a casting production mold for a combined counterweight according to claim 1, characterized in that: The outer ring side wall of the screw sleeve is annularly distributed with axially opened tooth grooves, the tooth grooves are meshed with gears, and the gears are connected to the motor, which is installed on the top of the shell.

8. The production process of a casting production mold for a combined counterweight according to claim 1, characterized in that: One end of the screw extends to the outside of the screw sleeve and is connected to a top cover. A distance sensor is provided on the top cover. The distance sensor is opposite to the top of the shell. The distance sensor detects the distance between the top cover and the top of the shell to determine the height value of the gap B.

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