Casting production mold and process for combined balance weight

Abstract

The invention belongs to the technical field of metal casting, and particularly relates to a casting production mold of a combined balance weight, which comprises an air pipe communicated with a sand box air chamber, and a section adjusting piece for adjusting the air circulation sectional area in the air pipe, the section adjusting part comprises a shell, the air pipe penetrates through the shell, a gap A is formed between one end of the air pipe and the inner wall of the shell, and a first through groove is formed in the position, corresponding to the gap A, of the air pipe; the adjusting plate is arranged in the shell, and a gap B for gas circulation is formed between one end, located in the gas pipe, of the adjusting plate and the inner wall of the gas pipe; a screw rod; and the screw sleeve is rotationally arranged. According to the casting production mold of the combined balance weight in the technical scheme, the air circulation sectional area in the air pipe is adjusted according to different positions of the sand box, so that the air suction amount in the whole sand mold is kept consistent, and therefore the hardness of the sand mold is consistent by guaranteeing the consistency of the air suction amount of the whole sand mold, and the situation that a casting deforms is avoided.

Description

Technical Field

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

[0002] When the combined counterweight is manufactured by the V-method casting, it has the advantages of smooth casting surface, clear contour, accurate dimensions, etc. The V-method casting requires a vacuum pumping operation through a sand box to keep the sand mold at a certain strength.

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

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

[0005] In view of the problems in the prior art, the present invention proposes the following technical solutions: A casting production mold for a combined counterweight includes 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 the gas flow in the air pipe; the cross-section adjusting member includes: A housing, the air pipe penetrates through the housing, and there is a gap A between one end of the air pipe and the inner wall of the housing, and a first through groove is opened at the position of the air pipe corresponding to the gap A; An adjusting plate arranged inside the housing, the adjusting plate penetrates through the first through groove and is in sliding and sealing cooperation with the first through groove, and there is a gap B for gas flow between one end of the adjusting plate located inside the air pipe and the inner wall of the air pipe; A screw rod, the screw rod is connected to one end of the adjusting plate located outside the air pipe; A rotatably arranged nut sleeve, the nut sleeve is in threaded cooperation with the screw rod, and the nut sleeve movably penetrates through the top of the housing and extends to the outside of the housing; Wherein, when the nut sleeve is rotated, the screw rod drives one end of the adjusting plate located inside the air pipe to approach or move away from the inner wall of the air pipe, and the height value of the gap B is adjusted.

[0006] As an optimization of the above technical solution, the mold is used for producing modular counterweights in a consolidated container. The modular counterweight includes an upper counterweight and a lower counterweight. The sand box includes an upper sand box and a lower sand box distributed in the up-down direction. Sand molds are arranged in both the upper sand box and the lower sand box. An upper cavity is arranged on the sand mold in the upper sand box, and a lower cavity is arranged on the sand mold in the lower sand box. The upper cavity and the lower cavity form a complete cavity. The cavity includes a cavity A matching the upper counterweight and a cavity B matching the lower counterweight.

[0007] As an optimization of the above technical solution, a ring plate is rotatably fitted to a section of the screw sleeve located inside the clearance A. The outer ring of the ring plate extends radially outward to form a slider. A limiting groove slidably fitted with the slider is formed on the side wall of the housing. An electric push rod arranged along the height direction of the adjusting plate is assembled on the slider.

[0008] As an optimization of the above technical solution, the limiting groove has a first contact surface and a second contact surface. A groove 1 is formed on the second contact surface. The electric push rod is assembled inside the groove 1. When the screw rod and the screw sleeve are in the initial position and the slider abuts against the second contact surface, the height value of the clearance B is 0. When the screw rod and the screw sleeve are in the initial position and the slider abuts against the first contact surface, the height value of the clearance B is the same as the height value of the air pipe.

[0009] As an optimization of the above technical solution, the screw sleeve and the ring plate are mechanically rotationally sealed and fitted. A sealing ring is arranged on the end surface of the ring plate. When the slider abuts against the first contact surface, the sealing ring deforms under the extrusion of the ring plate and the housing, and the housing remains in a sealed state. Two relatively distributed slide rails are arranged outside the air pipe. The adjusting plate is located between the two slide rails and is slidably fitted with them.

[0010] As an optimization of the above technical solution, a gas filter element is further included. The gas filter element includes a filter screen, a first permanent magnet arranged at the lower end of the adjusting plate, a second permanent magnet arranged at the upper end of the filter screen, and an electromagnet arranged at the lower end of the filter screen. Among them, the magnetic properties of the first permanent magnet and the electromagnet are the same, and the magnetic properties of the second permanent magnet and the first permanent magnet are opposite. A first armature is arranged on the end surface of the ring plate, and a second armature is arranged on the top wall of the housing. When the slider does not abut against the first contact surface, the second permanent magnet and the first permanent magnet are adsorbed, and the filter screen moves and unfolds along with the adjusting plate. When the slider abuts against the first contact surface, the first armature contacts the second armature, and the electromagnet is energized to generate a magnetic force to adsorb the second permanent magnet, and the filter screen is retracted.

[0011] As a preference of the above technical solution, a second groove for accommodating the first permanent magnet and the upper end of the filter screen is formed on the adjusting plate, and a second through groove for accommodating the electromagnet and the lower end of the filter screen is formed at a position of the air pipe opposite to the first through groove; The second through groove penetrates through the side wall of the air pipe, the electromagnet is installed on the sealing plate of the housing, and the sealing plate is detachably assembled with the housing.

[0012] As a preference of the above technical solution, tooth grooves axially opened are annularly distributed on the outer side wall of the screw sleeve, the tooth grooves are engaged with a gear, the gear is connected with a motor, and the motor is installed on the top of the housing.

[0013] As a preference of the above technical solution, one end of the screw rod extends to the outside of the screw sleeve and is connected with a top cover, a distance sensor is arranged on the top cover, the distance sensor faces the top of the housing, and the distance sensor detects the distance between the top cover and the top of the housing to determine the height value of the gap B.

[0014] A production process of a casting production mold for a combined counterweight includes adjusting the gas flow cross-sectional area in the air pipe according to different positions of the sand box, and comprises the following steps: S1. When molding, according to the different local shapes of the product, determine the gas flow cross-sectional area required for the air pipes at different positions of the sand box; S2. According to the required gas flow cross-sectional area corresponding to the air pipe, rotate the screw sleeve, and the screw rod drives the end of the adjusting plate located inside the air pipe to approach or move away from the inner wall of the air pipe, so as to adjust the height value of the gap B.

[0015] The beneficial effects of the present invention are as follows: 1. For a casting production mold for a combined counterweight in the present technical solution, the gas flow cross-sectional area in the air pipe is adjusted according to different positions of the sand box, so that the air extraction amount in the whole sand mold remains consistent. Thus, by ensuring the consistency of the air extraction amount in the whole sand mold, the hardness of the sand mold is made consistent, and the situation that the casting is deformed is avoided.

[0016] Meanwhile, in the present technical solution, through the threaded fit of the screw sleeve and the screw rod, the adjusting plate is driven 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, and the adjustment precision is high.

[0017] 2. For a casting production mold for a combined counterweight in this embodiment, the upper and lower counterweights are synchronously cast in the same mold, that is, the combined counterweight is produced by assembling the sand boxes, which can ensure that the pouring temperature, molten iron composition and cooling conditions of the upper and lower counterweights in the same mold are the same, and can ensure the dimensional consistency of the upper and lower counterweights, and preferably meet the requirements of the assembly dimensions. Description of the Drawings

[0018] Figure 1Shown is a schematic structural diagram of a casting production mold for a combined counterweight in Embodiment 1; Figure 2 Shown is a schematic side cross-sectional view of the air pipe cooperating with the cross-section adjusting member in Embodiment 1, where the screw rod and the screw sleeve are in the initial state and the value of gap B is greater than 0; Figure 3 Shown is a schematic side cross-sectional view of the air pipe cooperating with the cross-section adjusting member in Embodiment 1, where the screw rod and the screw sleeve are in the initial state, the value of gap B is greater than 0, and the slider contacts the first contact surface; Figure 4 Shown is a schematic structural diagram of the air pipe in Embodiment 1; Figure 5 Shown is a top view schematic diagram of the annular plate in Embodiment 1; Figure 6 Shown is a schematic structural diagram of the gas filter element in Embodiment 1; Figure 7 Shown is an upper box model diagram for the production of the combined counterweight in a split box in Embodiment 1; Figure 8 Shown is a lower box model diagram for the production of the combined counterweight in a split box in Embodiment 1.

[0019] Reference numerals: 10, air pipe; 11, first through groove; 12, second through groove; 13, slide rail; 20, housing; 21, limiting groove; 211, first contact surface; 212, second contact surface; 22, first groove body; 23, sealing plate; 30, adjusting plate; 31, second groove body; 40, screw rod; 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 element; 81, filter screen; 82, first permanent magnet; 83, second permanent magnet; 84, electromagnet. Detailed implementation manners

[0020] To make the objectives, 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.

[0021] Embodiment 1 When the width of the sand box is greater than 1220 mm, the side wall suction pipe can no longer meet the requirement that the vacuum reaches all areas of the sand mold, and there is a problem of inconsistent sand mold strength. The main manifestation is that the farther away from the suction port, the lower the sand mold strength, and the inconsistent sand mold strength will lead to the deformation of the casting. For this, the sand box is further optimized, and the pipes at different positions of the sand box are defined so that the air extraction amount in the entire sand mold remains consistent, thereby ensuring the consistency of the air extraction amount in the entire sand mold.

[0022] AsFigure 1 , Figure 2 , Figure 3 As shown in Figure 2 and Figure 3 , a casting production mold for a combined counterweight includes an air pipe 10 communicating with the air chamber of the sand box and a cross-section adjusting member for adjusting the cross-sectional area of the gas flow in the air pipe 10; the cross-section adjusting member includes: A housing 20, the air pipe 10 passes through the housing 20, and there is a gap A between one end of the air pipe 10 and the inner wall of the housing 20. A first through groove 11 is provided at the position of the air pipe 10 corresponding to the gap A; An adjusting plate 30 arranged inside the housing 20, the adjusting plate 30 passes through the first through groove 11 and is in sliding and sealing fit with the first through groove 11. There is a gap B for gas flow between one end of the adjusting plate 30 located inside the air pipe 10 and the inner wall of the air pipe 10; A screw rod 40, the screw rod 40 is connected to one end of the adjusting plate 30 located outside the air pipe 10; A rotatably arranged screw sleeve 50, the screw sleeve 50 is in threaded fit with the screw rod 40, and the screw sleeve 50 movably passes through the top of the housing 20 and extends to the outside of the housing 20; Among them, when the screw sleeve 50 is rotated, the screw rod 40 drives one end of the adjusting plate 30 located inside the air pipe 10 to approach or move away from the inner wall of the air pipe 10, adjusting the height value of the gap B. Specifically, the following is shown. When the screw sleeve 50 is rotated forward, the screw rod 40 drives one end of the adjusting plate 30 located inside the air pipe 10 to approach the inner wall of the air pipe 10, reducing the height value of the gap B, and the cross-sectional area of the gas flow in the air pipe 10 decreases; When the screw sleeve 50 is rotated in the reverse direction, the screw rod 40 drives one end of the adjusting plate 30 located inside the air pipe 10 to move away from the inner wall of the air pipe 10, increasing the height value of the gap B, and the cross-sectional area of the gas flow in the air pipe 10 increases.

[0023] A production process of a casting production mold for a combined counterweight includes adjusting the cross-sectional area of the gas flow in the air pipe 10 according to different positions of the sand box, including the following steps: S1. When modeling, according to the different local shapes of the product, determine the cross-sectional area of the gas flow required for the air pipes 10 at different positions of the sand box; Among them, the calculation of the cross-sectional area of the gas flow required for the air pipe 10 is as follows: According to the distance of the sand mold, control the strength of the sand mold by controlling the air extraction volume in the inner cavity of the sand mold. The air extraction volume S = 1.1(V 气 / t)ln(P0 / P); In the formula, S is the air extraction volume per unit time, 1.1 is a constant, V 气 is the air volume 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 at the start of air extraction, and P is the working pressure.

[0024] According to general production experience, the working pressure is reached within 5 - 10 s. For the convenience of calculation, t is taken as 6 s here, that is, 0.1 min; the pressure in the sand box at the start of air extraction is the atmospheric pressure, P0 is 101.3 kPa, and the working pressure P is 40 kPa. Substituting the above data into the formula respectively, we get: S = 1.1(V 气 / 0.1) ln(101.3 / 40) ≈ 10V 气 ; That is, the air extraction volume is about 10 times the volume of the air in the sand mold. Also, although the AFS particle sizes of the casting sands are different, the interstitial volumes of their sand grains are all about 30% of the total volume. That is, in the sand mold with a volume of V 型 , there is about 0.3V 型 volume of air. Therefore, in the above formula, S ≈ 3V 型 .

[0025] The air extraction volume S = vπ( ); It is deduced that d = 2 ; In the formula: S is the air extraction volume per unit time, v is the air flow velocity in the air pipe, and d is the pipe diameter of the air pipe. In V-method casting, the air flow velocity v in the air pipe is generally taken as 1200 m / min.

[0026] Substituting S ≈ 3V 型 into the above formula, the pipe diameter of the air pipe can be calculated according to the volume of the sand mold.

[0027] The following table shows the pipe diameters of the air pipes required for the sand mold volumes in different parts of the balance weight calculated according to the above formula.

[0028]

[0029] Among them, the air pipe in the above formula is a circular pipe. According to the value of the circular pipe diameter and combining with the area solution formula of the circle, the gas flow cross-sectional area is obtained.

[0030] S2. According to the required gas flow cross-sectional area corresponding to the air pipe 10, rotate the screw sleeve 50, and the screw rod 40 drives the end of the adjusting plate 30 located inside the air pipe 10 to approach or move away from the inner wall of the air pipe 10 to adjust the height value of the gap B; In this embodiment, the air pipe is a square pipe. Given the value of the gas flow cross-sectional area and the width value of the square pipe, according to the area solution formula of the rectangle, the height value of the gap B can be obtained.

[0031] In the casting production mold of a combined balance weight in this technical solution, the gas flow cross-sectional area inside the air pipe 10 is adjusted according to different positions of the sand box, so that the air extraction volume in the entire sand mold is kept consistent. Thus, by ensuring the consistency of the air extraction volume of the entire sand mold, the hardness of the sand mold is made consistent, and the situation of casting deformation is avoided. ​

[0032] Meanwhile, in this technical solution, the threaded fit between the screw sleeve 50 and the screw rod 40 drives the adjusting plate 30 to move, so as to change the height value of the gap B, thereby achieving the purpose of adjusting the cross-sectional area of the gas flow in the air pipe 10, and the adjustment accuracy is high.

[0033] In the production of counterweights in the prior art, due to the design requirements of appearance and manufacturing process, for example, when the width of the sand box is greater than 1220 mm, the side wall exhaust pipe can no longer meet the requirement that the vacuum reaches all areas of the sand mold, resulting in the problem of inconsistent hardness of the sand mold. The counterweight is designed as a combination of upper and lower counterweights for assembly and installation. When casting the upper and lower counterweights, the upper and lower counterweights are cast separately. Since the pouring temperature and molten iron composition of each box of counterweights are not the same, the solidification and shrinkage conditions of each counterweight are inconsistent, and the dimensional consistency of the produced upper and lower counterweights is poor, which cannot meet the requirements such as concentric assembly holes, consistent width, and uniform fit clearance when installing the upper and lower counterweights. It is necessary to take measures such as manual grinding to ensure that the product size accuracy meets the design requirements, increasing the production difficulty.

[0034] However, the mold in this embodiment can ensure that when the width of the sand box is greater than 1220 mm, the air extraction volume in the whole sand mold remains consistent, thus ensuring the consistency of the air extraction volume of the whole sand mold. For this, as Figure 1 、 Figure 7 、 Figure 8 shown, the mold in this embodiment is used for the combined production of counterweights in a split mold. The combined counterweight includes an upper counterweight and a lower counterweight. The sand box includes an upper sand box and a lower sand box distributed in the up-down direction. Sand molds are provided in both the upper sand box and the lower sand box. An upper cavity is provided on the sand mold in the upper sand box, and the specific shape of the upper cavity is as shown in the upper box model in Figure 7 . A lower cavity is provided on the sand mold in the lower sand box, and the specific shape of the lower cavity is as shown in the lower box model in Figure 8 . The upper cavity and the lower cavity form a complete cavity, and the cavity includes a cavity A matching the upper counterweight and a cavity B matching the lower counterweight.

[0035] A casting production mold for a combined counterweight in this embodiment synchronously casts the upper and lower counterweights in the same mold, that is, conducts split mold production for the combined counterweight, which 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, better meeting the requirements of assembly dimensions.

[0036] As Figure 2 、 Figure 3As shown, a section of the screw sleeve 50 located inside the gap A is rotatably fitted with an annular plate 60. An outer ring of the annular plate 60 extends radially outward to form a slider 61. A limiting groove 21 slidably fitted with the slider 61 is formed on a side wall of the housing 20. An electric push rod 70 arranged along the height direction of the adjusting plate 30 is assembled on the slider 61. When the overall length of the electric push rod 70 extends, the annular plate 60, the screw sleeve 50, the screw rod 40, and the adjusting plate 30 are driven to move upward by the slider 61. When the overall length of the electric push rod 70 shortens, the annular plate 60, the screw sleeve 50, the screw rod 40, and the adjusting plate 30 are driven to move downward by the slider 61.

[0037] In this technical solution, when performing a vacuum pumping operation inside the sand box, the threaded fit between the screw sleeve 50 and the screw rod 40 is utilized to drive the adjusting 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 inside the air pipe 10 for precise adjustment. When it is necessary to take out the product after casting and quickly break the sand mold and introduce gas into the sand box, the overall length of the electric push rod 70 is extended to drive the adjusting plate 30 and other structures to quickly move upward, achieving the purpose of quickly injecting gas and breaking the sand mold.

[0038] As Figure 2 、 Figure 3 、 Figure 4 shown, the limiting groove 21 has a first contact surface 211 and a second contact surface 212. A groove 22 is formed on the second contact surface 212. The electric push rod 70 is assembled inside the groove 22 for concealed assembly of the electric push rod 70.

[0039] 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. When the screw rod 40 and the screw sleeve 50 are in the initial position and the slider 61 abuts against the second contact surface 212, the height value of the gap B is 0, that is, the gas flow cross-sectional area inside the air pipe 10 is 0, and the air pipe 10 is completely closed. When the screw rod 40 and the screw sleeve 50 are in the initial position and the slider 61 abuts against the first contact surface 211, the height value of the gap B is consistent with the height value of the air pipe 10, that is, the gas flow cross-sectional area inside the air pipe 10 is the cross-sectional area of the air pipe 10, and the air pipe 10 is completely opened, achieving the purpose of quickly opening or closing the adjusting plate 30.

[0040] It is known that when the height value of the gap B is not 0, when the electric push rod 70 drives the adjusting plate 30 and other structures to quickly move upward, there is a situation where the adjusting plate 30 disengages from the through groove 11. At this time, the sealing state of the air pipe 10 is broken. For this, as Figure 2 、 Figure 3 、 Figure 4As 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 surface 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 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.

[0041] When the adjustment plate 30 is disengaged from the through groove 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 air pipe 10. The adjustment plate 30 is located between the two slide rails 13 and slides with them, ensuring that the circumferential position of the adjustment plate 30 is always limited and there is no problem of rotation.

[0042] The combined counterweight is cast by 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 harmful gases generated during the casting process during the vacuum operation to reduce 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.

[0043] The gas filter 80 includes a filter 81, on which an adsorbent for adsorbing harmful gases is arranged, 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.

[0044] A first armature 62 is provided on the end surface 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 contact the first contact surface 211, the second permanent magnet 83 and the first permanent magnet 82 are adsorbed, the filter 81 moves and unfolds 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 contacts 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.

[0045] like Figure 6As shown, a second groove 31 for accommodating the first permanent magnet 82 and the upper end of the filter screen 81 is formed on the adjusting plate 30. A second through groove 12 for accommodating the electromagnet 84 and the lower end of the filter screen 81 is formed at a position of the air pipe 10 opposite to the first through groove 11; the first permanent magnet 82, the filter screen 81, the second permanent magnet 83 and the electromagnet 84 can be effectively accommodated, preventing a gap from existing between the adjusting plate 30 and the inner bottom wall of the air pipe 10 and affecting the cross-sectional area of the gas flow in the air pipe 10.

[0046] The second through groove 12 penetrates through the side wall of the air pipe 10. The electromagnet 84 is installed on the sealing plate 23 of the housing 20. The sealing plate 23 is detachably assembled with the housing 20, enabling the replacement operation of the filter screen 81 and facilitating the replacement of the filter screen 81 that has reached adsorption saturation.

[0047] To improve the convenience of controlling the rotation of the control sleeve 50, as Figure 2 、 Figure 3 shown, axially arranged tooth grooves 51 are annularly distributed on the outer side wall of the sleeve 50. The tooth grooves 51 are engaged with a gear 52, and the gear 52 is connected to a motor 53. The motor 53 is installed on the top of the housing 20; the motor 53 is a servo motor that can rotate forward and backward. On the premise that the slider 61 is slidably engaged with the limiting groove 21, when the motor 53 is powered on, the sleeve 50 is driven to rotate through the cooperation of the gear 52 and the tooth grooves 51. Specifically, when the motor 53 drives the gear 52 to rotate forward, the sleeve 50 rotates reversely, 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 reversely, the sleeve 50 rotates forward, driving the screw rod 40 and the adjusting plate 30 to move downward, reducing the height value of the gap B; among them, the axial direction of the tooth grooves 51 is arranged on the outer side wall of the sleeve 50, meeting the requirement for the up-and-down movement of the sleeve 50.

[0048] To further accurately determine the value of the cross-sectional area of the gas flow in the air pipe 10 and ensure the casting quality of the combined balance weight, as Figure 2 、 Figure 3 shown, one end of the screw rod 40 extends to the outside of the sleeve 50 and is connected to a top cover 41. A distance sensor 42 is arranged on the top cover 41 and faces the top of the housing 20. On the premise that the slider 61 abuts against the first abutting surface 211, the distance sensor 42 detects the distance between the top cover 41 and the top of the housing 20, that is, the distance between the adjusting plate 30 and the inner bottom wall of the air pipe 10, to determine the height value of the gap B.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A casting production mold for a combined counterweight, comprising 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 the gas flow in the air pipe; characterized in that, The cross-section adjusting member includes: A housing through which the air pipe passes, and there is a gap A between one end of the air pipe and the inner wall of the housing. A first through groove is provided at the position of the air pipe corresponding to the gap A; An adjusting plate arranged inside the housing, which passes through the first through groove and is in sliding and sealing fit with the first through groove. There is a gap B for gas flow between one end of the adjusting plate located inside the air pipe and the inner wall of the air pipe; A screw rod connected to one end of the adjusting plate located outside the air pipe; A rotatably arranged nut sleeve threadedly engaged with the screw rod. The nut sleeve movably passes through the top of the housing and extends to the outside of the housing; Wherein, when the nut sleeve is rotated, the screw rod drives one end of the adjusting plate located inside the air pipe to approach or move away from the inner wall of the air pipe, and the height value of the gap B is adjusted.

2. A casting production mold for a combined counterweight according to claim 1, the mold being used for producing the combined counterweight by assembling in a box, the combined counterweight including an upper counterweight and a lower counterweight, the sand box including an upper sand box and a lower sand box distributed in the up-down direction, sand molds being provided in both the upper sand box and the lower sand box, an upper cavity being provided on the sand mold in the upper sand box, a lower cavity being provided on the sand mold in the lower sand box, the upper cavity and the lower cavity forming a complete cavity, characterized in that, The cavity includes a cavity A matching the upper counterweight and a cavity B matching the lower counterweight.

3. The casting production mold of a combined counterweight according to claim 1, characterized in that, A circular plate is rotatably fitted on a section of the nut sleeve located inside the gap A. The outer ring of the circular plate extends radially outward to form a slider. A limiting groove slidably matched with the slider is provided on the side wall of the housing. An electric push rod arranged along the height direction of the adjusting plate is assembled on the slider; 4. The casting production mold of a combined counterweight according to claim 3, characterized in that, The limiting groove has a first contact surface and a second contact surface. A first groove is provided on the second contact surface, and the electric push rod is assembled inside the first groove; When the screw rod and the nut sleeve are in the initial position and the slider abuts against the second contact surface, the height value of the gap B is 0; When the screw rod and the nut sleeve are in the initial position and the slider abuts against the first contact surface, the height value of the gap B is the same as the height value of the air pipe.

5. The casting production mold of a combined counterweight according to claim 4, characterized in that, The nut sleeve and the circular plate are in mechanical rotational sealing fit. A sealing ring is provided on the end surface of the circular plate. When the slider abuts against the first contact surface, the sealing ring is deformed by the extrusion of the circular plate and the housing, and the housing remains in a sealed state; Two oppositely distributed slide rails are arranged on the outside of the air pipe. The adjusting plate is located between the two slide rails and is in sliding fit with them.

6. The casting production mold of a combined counterweight according to claim 3, characterized in that, It further includes a gas filtering member, which includes a filter screen, a first permanent magnet arranged at the lower end of the adjusting plate, a second permanent magnet arranged at the upper end of the filter screen, and an electromagnet arranged at the lower end of the filter screen. Among them, the first permanent magnet and the electromagnet have the same magnetic property, and the second permanent magnet and the first permanent magnet have opposite magnetic properties; A first armature is provided on the end surface of the circular plate, and a second armature is provided on the top wall of the housing. When the slider does not abut against the first contact surface, the second permanent magnet and the first permanent magnet are adsorbed, and the filter screen moves and unfolds along with the adjusting plate; When the slider abuts against the first contact surface, the first armature contacts the second armature, and the electromagnet is energized to generate a magnetic force to adsorb the second permanent magnet, and the filter screen is retracted.

7. The casting production mold of a combined counterweight according to claim 6, characterized in that, A second groove for accommodating the first permanent magnet and the upper end of the filter screen is provided on the adjusting plate. A second through groove for accommodating the electromagnet and the lower end of the filter screen is provided at the position of the air pipe opposite to the first through groove; The second through groove penetrates the side wall of the air pipe. The electromagnet is installed on the blocking plate of the housing, and the blocking plate is detachably assembled with the housing.

8. A casting production mold for a combined counterweight according to claim 1, characterized in that, Axially arranged tooth grooves are annularly distributed on the outer side wall of the nut sleeve. The tooth grooves are engaged with a gear, and the gear is connected to a motor, and the motor is installed on the top of the housing.

9. A casting production mold for a combined counterweight according to claim 1, characterized in that, One end of the screw rod extends to the outside of the screw sleeve and is connected with a top cover. A distance sensor is arranged on the top cover. The distance sensor faces the top of the housing. The distance sensor detects the distance between the top cover and the top of the housing to determine the height value of the gap B.

10. The production process of a casting production mold for a combined counterweight according to any one of claims 1-9, characterized in that, It includes adjusting the gas flow cross-sectional area in the air pipe according to different positions of the sand box, and includes the following steps: S1. During molding, according to the different local shapes of the product, determine the gas flow cross-sectional areas required for the air pipes at different positions of the sand box; S2. According to the required gas flow cross-sectional area corresponding to the air pipe, rotate the screw sleeve, and the screw rod drives the end of the adjusting plate located inside the air pipe to approach or move away from the inner wall of the air pipe to adjust the height value of the gap B.

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