CN-122007387-A - Large steel casting sand mould stable overturning method based on synchronous control of big and small hooks

CN122007387ACN 122007387 ACN122007387 ACN 122007387ACN-122007387-A

Abstract

The invention discloses a large-scale steel casting sand mould stable overturning method based on synchronous control of big and small hooks, and relates to the technical field of steel casting sand mould production. The sand mould in the invention can finish overturning in the air, and is not contacted with the ground in the whole process, so that the problem of out-of-control angle caused by ground contact in the traditional overturning mode is avoided. And the overturning process does not have strong vibration, so that the green sand mold is effectively prevented from sinking, the dry sand mold is scrapped after falling, and the sand mold yield is greatly improved. And guarantee the stability of sand mould upset, reduced sand box reinforcement volume, avoid sand mould upset fracture simultaneously, ensure sand mould dimensional accuracy, promote cast steel product quality.

Inventors

CHEN TAO
Liu Juezhi
JIANG XIAOSHAN
XIONG HUOSHUN
WU WENJUN
CHEN CHUNYU
ZHOU TIAN
LIU JIBING
PEI JIAN
ZHANG ZHUOQUN
Lang Zhixing

Assignees

中车长江铜陵车辆有限公司

Dates

Publication Date: 20260512
Application Date: 20260227

Claims (9)

1. The method for stably overturning the large steel casting sand mould based on synchronous control of the big and small hooks is characterized by comprising the following steps of: S1, hoisting and fixing, namely tightening and fixing one end of a sand mold by using a steel wire rope arranged on a large hook body (204), and lifting the other end of the sand mold by using a steel wire rope arranged on a small hook body (215) to form a two-point support; S2, emptying and hoisting, namely controlling the large hook body (204) and the small hook body (215) to synchronously hoist the sand mould, so that the whole height of the sand mould is higher than the width of the sand box, and the hoisting height is required to meet the condition that the sand mould is not contacted with any obstacle in the process of turning over at 180 degrees; S3, rope loosening and unloading, namely controlling the sand mould at the end of the small hook body (215) to slowly fall, and taking down the steel wire rope when the steel wire rope at the end of the small hook body (215) is completely loosened; s4, turning over in the air, namely starting a first rotary driving motor (201) for controlling the large hook body (204) to rotate in a travelling crane, wherein the first rotary driving motor (201) is started to drive the small hook body (215) to rotate, the sand mold is kept stable in posture in the rotating process, the small hook body (215) faces the original bottom surface of the sand mold, and after the rotation is completed, the sand mold is lifted again by using a steel wire rope at the end of the small hook body (215); s5, synchronously falling, namely controlling the large hook body (204) and the small hook body (215) to synchronously fall at a uniform speed, ensuring that the sand mold stably falls to a target position, and finishing the overturning action.
2. The method for stably overturning the large-scale steel casting sand mould based on the synchronous control of the big and small hooks according to claim 1, wherein in the step S4, a driving connecting plate (101) is fixedly connected to the bottom end of the top of the driving, a protection frame (102) is fixedly connected to the center of the top end of the driving connecting plate (101), an annular sliding groove (103) is formed in the bottom end of the driving connecting plate (101), and a through hole (104) is formed in the position, located at the bottom end of the protection frame (102), of the top end of the driving connecting plate (101).
3. The method for stably overturning the large-scale steel casting sand mould based on the synchronous control of the large and small hooks according to claim 2, wherein in the step S3, the slow falling of the sand mould at the end of the small hook body (215) is performed by starting the rotary driving motor II (211), a threaded column II (219) is fixedly connected to the top end of the small hook body (215), a separation connecting block (214) is arranged at the top end of the small hook body (215), a threaded groove II (218) is formed in the bottom end of the separation connecting block (214), and the threaded column II (219) is in threaded connection with the inside of the threaded groove II (218).
4. The method for stably overturning the large steel casting sand mold based on synchronous control of the big and small hooks according to claim 3, wherein the top end of the separation connecting block (214) is fixedly connected with a series rope (213), the output end of the rotary driving motor II (211) is close to the series rope (213), the output end of the rotary driving motor II (211) is fixedly connected with a rotary winding block (212), one end of the series rope (213) far away from the separation connecting block (214) is fixedly connected to the surface of the rotary winding block (212), the series rope (213) is wound on the surface of the rotary winding block (212), two sides of the outer part of the rotary winding block (212) are respectively connected with a rope plate I (209) and a rope plate II (210) in a rotating mode, and the rotary driving motor II (211) is fixedly connected to the inner part of the rope plate I (209).
5. The method for stably overturning a large-scale steel casting sand mold based on synchronous control of large and small hooks according to claim 4, wherein a central connecting block (208) is fixedly connected to the middle parts of a first rope plate (209) and a second rope plate (210), a connecting rotating block (206) is fixedly connected to the top end of the central connecting block (208), a sliding block (207) is fixedly connected to the top end of the sliding block (207), and the sliding block (207) is slidably connected to the inside of the annular sliding groove (103).
6. The method for stably overturning the large steel casting sand mold based on the synchronous control of the large and small hooks according to claim 5, wherein in the step S4, a first threaded column (217) is fixedly connected to the top end of the large hook body (204), a center rotating block (203) is arranged at the top end of the large hook body (204), a connecting strip (205) is fixedly connected to one side of the center rotating block (203) close to the connecting rotating block (206), one end, far away from the center rotating block (203), of the connecting strip (205) is fixedly connected to the side surface of the connecting rotating block (206), a first threaded groove (216) is formed in the bottom end of the center rotating block (203), the first threaded column (217) is in the first threaded groove (216), a connecting rod (202) is fixedly connected to the top end of the center rotating block (203), the output end of the first rotary driving motor (201) is located in the through hole (104), the connecting rod (202) is fixedly connected to the output end of the first rotary driving motor (201), and the first rotary driving motor (201) is located in the protective frame (102).
7. The method for stably overturning a large steel casting sand mold based on synchronous control of large and small hooks according to claim 1, wherein in the step S1, a splayed winding fixing method is adopted for the steel wire rope, a rubber anti-slip cushion layer is additionally arranged at the contact position of the large hook body (204) and the steel wire rope, the rubber anti-slip cushion layer is used for improving friction coefficient, the lifting point of the small hook body (215) is measured and calculated through the center of gravity of the sand mold, three-point positioning lines are marked on the side surface of the sand mold, and the three-point positioning lines are used for ensuring that the initial balance degree of lifting is less than or equal to 2 degrees.
8. The method for stably overturning a large steel casting sand mould based on synchronous control of large and small hooks according to claim 1, wherein in the step S2, the lifting speed is controlled in three stages, the three stages are respectively the initial 0.1m/S when the lifting speed is within 0.5m from the ground, the middle 0.3m/S when the lifting speed is at a safe height and the end 0.2m/S when the lifting speed is close to the target height, and the lowest point of the sand mould is more than or equal to the width of a sand box and more than 100mm from the ground.
9. The method for stably overturning a large steel casting sand mold based on synchronous control of large and small hooks according to claim 1, wherein in the step S3, the falling speed of the small hook body (215) is linked with the tension of a steel wire rope, when the tension sensor for detecting the tension detects that the tension is reduced to 30% of an initial value, a deceleration mode is automatically triggered, and the judgment standard of complete looseness of the steel wire rope is that the sag of the steel wire rope is larger than or equal to 150mm and the steel wire rope has no swinging trend through a visual recognition system.

Description

Large steel casting sand mould stable overturning method based on synchronous control of big and small hooks Technical Field The invention relates to the technical field of casting sand mold production, in particular to a large-scale casting sand mold stable overturning method based on synchronous control of big and small hooks. Background The production process of the large steel casting sand mould mainly comprises the following core links of firstly designing and manufacturing a wood mould or a metal mould according to a casting drawing, and preparing high-performance molding sand and core sand. And then molding and core making are carried out, and the sand mold and the sand core are assembled into a complete casting mold through the combination molding. In the smelting stage, molten steel is smelted according to chemical components, and molten metal is injected into a cavity through a pouring system. And after the metal is cooled and solidified, carrying out shakeout and cleaning. And finally, ensuring the qualification of the casting through quality inspection. The process has the advantages of low cost, strong adaptability, capability of producing complex large parts and the like, is widely applied to the production of steel castings, but needs to strictly control the molding sand performance, the casting parameters and the cleaning process so as to avoid the defects of sand inclusion, sand expansion and the like and ensure the quality of castings. However, in the existing production process of the large-scale steel casting sand mould, the sand mould needs to be overturned to finish the procedures of stripping, trimming, brushing, mould assembling and the like. At present, single-side straight lifting overturning or binding overturning is commonly adopted in the industry. In the overturning process, the sand mold is easy to contact with the ground, and the running crane is difficult to accurately control the overturning angle, so that the overturning failure is caused. And the device generates strong vibration during overturning, so that the green sand mold is easy to sink or the dry sand mold is easy to drop and scrap, and the product quality and the production efficiency are seriously affected. The single-side straight lifting or binding type overturning easily causes hard contact between the sand mould and the ground to cause overturning failure, the driving control precision is insufficient, accurate angle regulation and control are difficult to realize, and working procedure deviations such as mould stripping, trimming and the like are caused. Related patents related to sand mold overturning and lifting relate to the following concrete steps: The turnover lifting device for the small sand core sand mould belongs to the field of sand core sand mould lifting devices, and comprises a hanging head, a clamping arm and turnover plates, wherein the upper end of the hanging head is connected with a hanging ring, the clamping arm is arranged in a mirror image mode in the same plane, one end of the clamping arm is coaxially hinged to the hanging head, the other end of the clamping arm is connected with a rotating shaft box, the 2 turnover plate faces are respectively connected and installed on a rotating shaft in parallel, the 2 turnover plates can correspondingly form clamping cooperation when the clamping arm is matched with swing, the device can carry out mechanical auxiliary transportation on the small sand core and the sand mould and realize synchronous turnover on the sand core or the sand mould in the transportation process, the structure is simple, the performance is reliable, the use is convenient, the labor intensity of workers can be reduced in the casting production process, the production efficiency of products can be improved, meanwhile, damage and destruction possibly caused to the small sand core and the sand mould in the turnover process can be reduced, the raw material consumption is reduced, the sand mould and the mould quality of the sand mould are improved, and the casting product quality is guaranteed. However, in the above prior art patents, the mechanical auxiliary transportation of the small sand core and sand mold can be realized in production, and the synchronous turning of the sand core or sand mold in the transportation process can be realized. However, the scheme only has effects on small sand cores and sand molds, and the clamping arms and the rotating shafts cooperate to produce large cast steel sand molds, so that the problems of unstable transportation, unstable sand mold cracking caused by overlarge overturning moment, device deformation caused by insufficient structural rigidity, position deviation caused by insufficient control precision and the like are easily caused by insufficient clamping force, the labor intensity of workers cannot be effectively reduced, the production efficiency and the product quality are reduced due to the increase of operation difficulty and th