A precision casting process for main frame of mining machinery

Abstract

The present invention belongs to the technical field of casting of main frames of mining machinery, and particularly relates to a precision casting process of main frames of mining machinery, wherein a support rod is fixedly supported by a support block above the left end portion of the sand cleaning pool, and the support rod is used to suspend the casting clamped by a cathode clamp unit, and the cathode clamp unit is used to clamp the cooled casting and suspend it in the cleaning brine injected into the sand cleaning pool, and a supporting cross frame is symmetrically fixed to the upper box mouth in the sand cleaning pool, and a driving screw is rotatably arranged in the supporting cross frame, and the symmetrical driving screw is connected to a mesh anode mechanism, and the present invention allows the cleaned gravel to be directly retained in the sand cleaning pool, and the removed gravel will not be scattered around the casting, and at the same time, the gravel mixed in the cleaning brine can be separated and processed, so that the cleaned gravel can be quickly discharged from the sand cleaning pool.

Description

Technical Field

[0001] The invention belongs to the technical field of casting of a main frame of a mining machinery, and in particular relates to a precision casting process of a main frame of a mining machinery. Background Art

[0002] With the continuous advancement of science and technology, mining machinery is needed in the process of mining operations. Mining machinery needs to be cast during the production process. The whole process requires a casting structure for the production of mining machinery wear-resistant castings.

[0003] Since the existing main frame of mining machinery is directly sand-cleaned by hydraulic impact, vibration beating, shot blasting and other methods in the process of casting the required castings by precision casting process, especially in the final post-processing process step, it is obvious that this method is not only difficult to quickly and efficiently clean the gravel on the surface of the casting, but also easy to cause the gravel to splash after cleaning and require secondary cleaning and collection, which will affect the quality of precision casting molding of the main frame of mining machinery by precision casting process. Summary of the invention

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The present invention is a precision casting process for a main frame of a mining machinery, and the process comprises the following steps:

[0006] S1: Material preparation: Select high-quality pig iron, scrap steel and alloy materials, mix them according to a certain proportion, and conduct inspection and screening;

[0007] S2: Material smelting: Add the ingredients into the smelting furnace, raise the temperature to 1550-1620℃, and smelt; during the smelting process, stir the molten iron continuously to make its composition uniform;

[0008] S3: Casting: Use the bottom pouring method to slowly pour the molten iron into the mold, control the casting temperature to 1300-1400℃, the pouring speed to 1-3kg / s, and the pouring time to 10-20 minutes;

[0009] S4: Cooling: Use natural cooling to cool the casting to room temperature in air;

[0010] S5: Subsequent processing: The cooled casting is clamped by the cathode clamp unit and placed in the sand cleaning tank, cleaning salt water is added to the sand cleaning tank, and 220V-300V direct current is connected to the anode mechanism and the cathode clamp unit in the sand cleaning tank, so that the anode mechanism, the cathode clamp unit, the cleaning salt water and the casting form an electrical circuit in the sand cleaning tank, thereby realizing sand cleaning of the casting;

[0011] Among them, a support rod is fixedly supported by a support block above the left end of the sand cleaning tank, and the support rod is used to suspend the casting clamped by the cathode clamp unit. The cathode clamp unit is used to clamp the cooled casting and suspend it in the cleaning brine injected into the sand cleaning tank. A supporting cross frame is symmetrically fixed to the upper box mouth in the sand cleaning tank, and a driving screw is rotatably arranged in the supporting cross frame. The symmetrical driving screw is connected to the mesh anode mechanism.

[0012] Furthermore, the cathode clamp unit includes an insulating hook, a connecting strip, a hook ring, a cathode clamp, a conductive copper plate and a cathode wire. The symmetrical insulating hooks are detachably hung on the support rod, and the two insulating hooks are connected by a connecting strip. A hook ring is vertically fixed to the middle of the connecting strip. The bottom end of each insulating hook is insulated and connected to a cathode clamp for clamping the casting. The other clamping jaws of the two cathode clamps are connected by a conductive copper plate, a cathode wire is connected to the conductive copper plate, and the cathode wire is connected to the negative pole of the power cord.

[0013] Furthermore, the anode mechanism includes an anode frame, an anode mesh plate, an insulating block, an L-shaped connecting block, an insulating sealing strip and an anode wire. The anode frame is slidably inserted into the sand cleaning tank, and a mounting cavity for inserting the anode mesh plate is vertically opened inside the anode frame. The anode mesh plate can be detachably installed in the mounting cavity. An L-shaped connecting block is symmetrically fixed on the screw nut of the driving screw, and insulating grooves are opened on the vertical blocks of the L-shaped connecting block and the corresponding sides of the anode frame, and insulating blocks are installed in the insulating grooves. The insulating blocks are symmetrically fitted to the front and rear sides of the anode frame, and the L-shaped connecting block and the insulating block are connected to the anode frame by insulating screws. The front and rear side walls of the anode frame are sealed and slidably fitted to the box wall of the sand cleaning tank by insulating sealing strips. The back of the anode frame is connected to the anode wire, and the anode wire is connected to the positive pole of the power line.

[0014] Furthermore, the anode mechanism also includes an anode plug-in plate, an insulating strip, a gantry frame and a lifting cylinder. A plug-in cavity is opened on the anode frame, and the plug-in cavity is located on the front side of the installation cavity. The anode plug-in plate is slidably plugged into the plug-in cavity, and the anode plug-in plate is located on the front side of the movement of the anode mesh plate. The top end of the anode plug-in plate is connected to the insulating strip. The upper surface of the horizontal block of the symmetrical L-shaped connecting block is fixedly connected to the vertical frame of the gantry frame. At least two lifting cylinders are vertically fixed on the horizontal frame of the gantry frame, and the lower surface of the piston rod of the lifting cylinder is connected to the insulating strip.

[0015] Furthermore, the right side wall and the bottom of the sand cleaning tank are connected to an injection pipe for injecting sand cleaning brine, the left side wall and the bottom of the sand cleaning tank are connected to a sand discharge pipe for discharging waste sand, the left side wall of the bottom of the sand cleaning tank is connected to an aeration pipe, and the pipe opening of the aeration pipe located inside the sand cleaning tank is connected to an aeration hose, and the other end of the aeration hose is sealed and connected to the side of the anode frame, and a plurality of aeration holes are opened on the aeration hose.

[0016] Furthermore, a water pump body is fixed below the portal frame and at a position offset from the lifting cylinder. Two ports of the water pump body are connected to the cell body on both side walls of the anode frame through bending pipes, and a filter screen is fixed to the lower end of the bending pipe.

[0017] Furthermore, high-pressure nozzles are obliquely fixed at two corners of the left side wall of the sand cleaning tank, and the nozzles of the high-pressure nozzles are oriented toward the direction of the clamped casting.

[0018] Furthermore, an elastic sealing film is sealingly and slidingly provided in the sliding groove opened on the upper surface of the supporting cross frame, and one end of the elastic sealing film is connected to the side of the L-shaped connecting block, and the other end thereof is connected to the groove wall of the sliding groove.

[0019] The present invention has the following beneficial effects:

[0020] 1. The present invention designs a sand cleaning pool in the post-processing step of the precision casting process, and installs a cathode clamp unit and a slidable mesh anode mechanism in the sand cleaning pool. The cathode clamp unit can not only clamp and suspend the casting into the sand cleaning pool, but also act as a conductive cathode. The mesh anode mechanism can not only act as an anode, but also form a conductive loop with the cathode clamp unit and the cleaning brine to quickly clean the casting in the sand cleaning pool, so that the cleaned sand and gravel will be directly retained in the sand cleaning pool, and the removed sand and gravel will not be scattered around the casting. At the same time, the sand and gravel mixed in the cleaning brine can be separated and processed, so that the cleaned sand and gravel can be quickly discharged from the sand cleaning pool, and only a small amount of cleaning brine is discharged. Therefore, not only will the subsequent sand cleaning of the casting not be affected due to excessive sand and gravel accumulated in the sand cleaning pool, but also a large amount of cleaning brine will not be wasted when the sand and gravel are discharged from the sand cleaning pool.

[0021] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] Figure 1 It is a process flow chart of the casting process disclosed in the present invention;

[0024] Figure 2 It is a structural schematic diagram of the sand cleaning pool disclosed in the present invention;

[0025] Figure 3 It is a schematic diagram of the internal structure of the sand cleaning tank disclosed in the present invention;

[0026] Figure 4 It is a structural schematic diagram of the cathode clamp unit disclosed in the present invention;

[0027] Figure 5 It is a structural schematic diagram of the anode mechanism disclosed in the present invention;

[0028] Figure 6 It is a structural diagram of the installation of the anode screen plate and the anode plug plate disclosed in the present invention;

[0029] Figure 7 It is a schematic structural diagram of the anode frame disclosed in the present invention.

[0030] In the figure: 1. sand cleaning tank; 2. supporting cross frame; 3. driving screw; 4. cathode clamp unit; 41. supporting block; 42. supporting rod; 43. insulating hook; 44. connecting strip; 45. hook ring; 46. cathode clamp; 47. conductive copper plate; 48. cathode wire; 5. anode mechanism; 51. anode frame; 511. installation cavity; 512. plug-in cavity; 52. anode mesh plate; 53. insulating block; 54. L-shaped connecting block; 55. insulating sealing strip; 56. anode wire; 57. anode plug-in plate; 58. insulating strip; 59. door frame; 591. lifting cylinder; 6. liquid injection pipe; 7. sand discharge pipe; 8. aeration pipe; 81. aeration hose; 9. bending pipe; 10. high-pressure nozzle; 11. elastic sealing membrane. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] See also Figure 1-Figure 7 As shown, the present invention is a precision casting process for a main frame of a mining machinery, and the process comprises the following steps:

[0034] S1: Material preparation: Select high-quality pig iron, scrap steel and alloy materials, mix them according to a certain proportion, and conduct inspection and screening;

[0035] S2: Material smelting: Add the ingredients into the smelting furnace, raise the temperature to 1550-1620℃, and smelt; during the smelting process, stir the molten iron continuously to make its composition uniform;

[0036] S3: Casting: Use the bottom pouring method to slowly pour the molten iron into the mold, control the casting temperature to 1300-1400℃, the pouring speed to 1-3kg / s, and the pouring time to 10-20 minutes;

[0037] S4: Cooling: Use natural cooling to cool the casting to room temperature in air;

[0038] S5: Subsequent processing: The cooled casting is clamped by the cathode clamp unit 4 and placed in the sand cleaning tank 1, and cleaning salt water is added to the sand cleaning tank 1. A 220V-300V direct current is applied to the anode mechanism 5 and the cathode clamp unit 4 in the sand cleaning tank 1, so that the anode mechanism 5, the cathode clamp unit 4, the cleaning salt water and the casting form an electrical circuit in the sand cleaning tank 1, thereby performing sand cleaning on the casting;

[0039] Among them, a support rod 42 is fixedly supported by a support block 41 above the left end of the sand cleaning tank 1, and the support rod 42 is used to suspend the casting clamped by the cathode clamp unit 4. The cathode clamp unit 4 is used to clamp the cooled casting and suspend it in the cleaning brine injected into the sand cleaning tank 1. The upper box opening in the sand cleaning tank 1 is symmetrically fixed with a support cross frame 2, and a driving screw 3 is rotatably arranged in the support cross frame 2. The symmetrical driving screw 3 is connected to the mesh anode mechanism 5;

[0040] Specifically, when the cast casting is cooled, the processing personnel can control the suspension mechanism to suspend the cathode clamp unit 4 above the casting, and then clamp the cathode clamp unit 4 to a suitable position of the casting, and then the suspension mechanism transfers the clamped casting to the sand cleaning pool 1. At this time, the support rod 42 will suspend the cathode clamp unit 4, and then inject a certain amount of cleaning salt water into the sand cleaning pool 1, so that the casting to be cleaned can be suspended and supported in the cleaning salt water, and then the cathode clamp unit 4 is connected to the negative power line. , and the anode mechanism 5 is connected to the positive power line, so that the anode mechanism 5, the cathode fixture unit 4, the cleaning brine and the casting form an electrical circuit in the sand cleaning tank 1. Under the action of the DC voltage, the positively charged iron ions on the anode plate are separated and migrated toward the cathode. During the migration process in the water, the iron ions will absorb a layer of water film and migrate to the metal surface of the casting. The sand layer of the casting is isolated from the metal surface of the casting by the water film until the casting bubbles and the power is cut off, the sand layer is completely detached, and then the power is stopped, the cathode fixture unit 4 is lifted from the sand cleaning tank 1, and then the sand layer The detached casting will be lifted up from the sand cleaning pool 1 synchronously, so that the casting can be quickly sand cleaned, and the cleaned gravel will be directly retained in the sand cleaning pool 1, and the removed gravel will not be scattered around the casting. Since the mesh anode mechanism 5 is driven by the driving screw 3 to slide in the sand cleaning pool 1, it can not only reduce the distance between the anode mechanism 5 and the clamped casting, but also achieve better sand cleaning of the casting. At the same time, when the sand-cleaned casting is lifted up from the sand cleaning pool 1, the mesh anode mechanism 5 can act as a The filter screen slides toward the left side wall of the sand cleaning pool 1, so that it can scrape the cleaned gravel to the left side of the sand cleaning pool 1 for gathering, and then the mesh anode mechanism 5 can act as a partition to open the sand discharge pipe 7 at the left side bottom of the sand cleaning pool 1, so that the cleaned gravel can be quickly discharged from the sand cleaning pool 1, and only a small amount of cleaning brine is discharged. Therefore, not only will the subsequent sand cleaning process of the casting not be affected due to excessive sand and gravel gathered in the sand cleaning pool 1, but also a large amount of cleaning brine will not be wasted when the sand and gravel are discharged from the sand cleaning pool 1.

[0041] In the embodiment, the cathode clamp unit 4 includes an insulating hook 43, a connecting strip 44, a hook ring 45, a cathode clamp 46, a conductive copper plate 47 and a cathode wire 48. The symmetrical insulating hooks 43 are detachably hung on the support rod 42, and the two insulating hooks 43 are connected by a connecting strip 44. A hook ring 45 is vertically fixed to the middle of the connecting strip 44. The bottom end of each insulating hook 43 is insulated and connected to a cathode clamp 46 for clamping the casting. The other clamping jaws of the two cathode clamps 46 are connected by a conductive copper plate 47. A cathode wire 48 is connected to the conductive copper plate 47, and the cathode wire 48 is connected to the negative pole of the power line.

[0042] Specifically, when the casting is cooled, the cathode clamps 46 are opened to clamp the casting at a suitable position, and then the hook of the suspension mechanism is hooked to the hook ring 45. Then the suspension mechanism works to lift the casting to the left side wall of the sand cleaning pool 1 through the connecting strip 44, the insulating hook 43 and the cathode clamp 46. Then the casting slowly descends into the sand cleaning pool 1. At this time, the insulating hook 43 is hooked to the support rod 42 supported by the support block 41, so that the insulating hook 43 can suspend the casting. The support is suspended into the cleaning brine filled in the sand cleaning tank 1, and then the negative pole of the power line is connected to the cathode wire 48 to realize ionization sand cleaning of the cathode casting; and after the casting sand cleaning is completed, the negative pole of the power line is removed from the cathode wire 48, and then the hook of the suspension mechanism is hung on the hook ring 45, and the casting clamped by the cathode clamp 46 is lifted and taken out from the sand cleaning tank 1, and the insulating hook 43 will be detached from the support rod 42, so as to facilitate the removal of the sand-cleaned casting from the sand cleaning tank 1.

[0043] In the embodiment, the anode mechanism 5 includes an anode frame 51, an anode mesh plate 52, an insulating block 53, an L-shaped connecting block 54, an insulating sealing strip 55 and an anode wire 56. The anode frame 51 is slidably inserted into the sand cleaning tank 1, and a mounting cavity 511 for inserting the anode mesh plate 52 is vertically opened inside the anode frame 51. The anode mesh plate 52 can be detachably installed in the mounting cavity 511. The L-shaped connecting block 54 is fixed to the lead screw nut of the symmetrical driving screw 3, and the vertical block of the L-shaped connecting block 54 is provided with an insulating groove on the side corresponding to the anode frame 51, and the insulating block 53 is installed in the insulating groove. The insulating block 53 is symmetrically attached to the front and rear sides of the anode frame 51. The L-shaped connecting block 54 and the insulating block 53 are connected to the anode frame 51 through insulating screws. The front and rear side walls of the anode frame 51 are sealed and slidably attached to the box wall of the sand cleaning tank 1 through the insulating sealing strip 55. The back of the anode frame 51 is connected to the anode wire 56, and the anode wire 56 is connected to the positive pole of the power line.

[0044] Specifically, when the positive pole of the power line is connected to the anode wire 56, the anode frame 51 and the anode mesh plate 52 can form an anode plate to conduct a conductive reaction in the cleaning brine of the sand cleaning tank 1, so as to achieve sand cleaning of the casting clamped by the cathode clamp unit 4; and the rotation of the driving screw 3 will drive the anode frame 51 to slide through the screw slider, the L-shaped connecting block 54 and the insulating block 53. At this time, the anode frame 51 and the anode mesh plate 52 can act as an interception net, and the anode mesh plate 52 sliding to the left can push the remaining sand and gravel in the cleaning brine to the left side of the sand cleaning tank 1, so as to intercept and separate the cleaning brine and the sand and gravel, and facilitate the cleaning after The sand and gravel are quickly discharged from the sand cleaning tank; the anode mesh plate 52 is detachably connected to the L-shaped connecting block 54 through the insulating block 53, which is convenient for disassembling and replacing the anode frame 51 and the anode mesh plate 52 that have been used for a long time; and the two sides of the anode frame 51 are in contact with the pool wall of the sand cleaning tank 1 made of insulating material through the insulating sealing strips 55, which can not only further insulate the anode frame 51 and the sand cleaning tank 1, but also the insulating sealing strips 55 can play a sealing role when the anode frame 51 slides, preventing the sand and gravel mixed in the cleaning brine from leaking during filtering and interception, thereby affecting the rapid sand cleaning effect of the cleaning brine.

[0045] In the embodiment, the anode mechanism 5 further comprises an anode plug plate 57, an insulating strip 58, a gantry frame 59 and a lifting cylinder 591. A plug-in cavity 512 is provided on the anode frame 51, and the plug-in cavity 512 is located at the front side of the installation cavity 511. The anode plug plate 57 is slidably plugged into the plug-in cavity 512, and the anode plug plate 57 is located at the front side of the anode mesh plate 52. The top end of the anode plug plate 57 is connected to the insulating strip 58. The upper surface of the horizontal block of the symmetrical L-shaped connecting block 54 is fixedly connected to the vertical frame of the gantry frame 59. At least two lifting cylinders 591 are vertically fixed on the horizontal frame of the gantry frame 59, and the lower surface of the piston rod of the lifting cylinder 591 is connected to the insulating strip 58.

[0046] Specifically, when the anode frame 51 slides toward the left side of the pool wall, the piston rod of the lifting cylinder 591 contracts, so that it drives the anode plug plate 57 to slide upward from the plug-in cavity 512 through the insulating strip 58, so that the anode mesh plate 52 is opened and exposed, and then the anode frame 51 slides to the left. At this time, the opened anode mesh plate 52 will separate and intercept the salt water and gravel, so that the gravel is pushed to the left side of the pool wall of the sand cleaning pool 1, and then the piston rod of the lifting cylinder 591 extends out, so that it pushes the anode plug plate 57 to slide downward in the plug-in cavity 512 through the insulating strip 58, so that the anode mesh plate 52 is blocked, so that the anode frame 51 and the anode plug plate 57 form a sealed partition in the sand cleaning pool 1, and then the left side of the pool bottom of the sand cleaning pool 1 is opened. The sand discharge pipe 7 is opened, so that the intercepted and filtered sand and gravel can be quickly discharged from the sand cleaning tank 1 without causing a large amount of cleaning brine loss; when the sand and gravel on the left side of the anode frame 51 are completely discharged, the anode plug plate 57 is slowly lifted upwards, the anode mesh plate 52 will be opened, and then the cleaning brine on the right side of the anode frame 51 will partially enter the left side to clean the remaining sand and gravel, and then the sand discharge pipe 7 is closed, and the anode frame 51 continues to slide to the right, which will allow the cleaning brine to continue to fill the sand cleaning tank 1, and continue the sand cleaning process of the casting, and the anode plug plate 57 slides downward and is completely inserted into the plug-in cavity 512, so that it cooperates with the anode frame 51 and can fully act as an anode plate for energized sand cleaning.

[0047] In the embodiment, the right side wall bottom of the sand cleaning tank 1 is connected to a liquid injection pipe 6 for injecting sand cleaning salt water, the left side wall bottom of the sand cleaning tank 1 is connected to a sand discharge pipe 7 for discharging waste sand, the left side wall of the bottom of the sand cleaning tank 1 is connected to an aeration pipe 8, and the pipe opening of the aeration pipe 8 located inside the sand cleaning tank 1 is connected to an aeration hose 81, and the other end of the aeration hose 81 is sealed and connected to the side of the anode frame 51, and the aeration hose 81 is provided with a plurality of aeration holes;

[0048] Specifically, the processing personnel can fill the cleaning salt water into the injection pipe 6 as needed to supplement the cleaning salt water in the sand cleaning pool 1; and the sand discharge pipe 7 on the left side is opened to quickly discharge the sand and gravel scraped off and separated from the left side of the anode frame 51 after sliding; and when the casting bubbles and the power is cut off, the anode wire 56 on the anode frame 51 is disconnected from the power line, and then slides to the right side close to the casting, and then the anode plug plate 57 is inserted and sealed to the left side of the anode mesh plate 52, and when the anode frame 51 slides, the aeration hose 81 will be compressed, and then Then, high-pressure gas or high-pressure water is introduced into the aeration hose 81 through the aeration pipe 8, so that the cleaning brine on the left side of the anode frame 51 is tumbled and pushed. At this time, the casting is still in the sand cleaning tank 1. Therefore, the tumbling cleaning brine will flush and clean the sand layer separated from the surface of the casting, thereby accelerating the separation speed of the sand layer on the surface of the casting after the electrical reaction. When the cleaned casting is discharged from the sand cleaning tank 1, the remaining sand and gravel will be discharged through the sand discharge pipe 7, and the rightward sliding of the anode frame 51 will stretch the aeration hose 81 to restore it to its initial state.

[0049] In the embodiment, a water pump body is fixed below the door frame 59 and at a position offset from the lifting cylinder 591. The two ports of the water pump body are connected to the cell body of the two side walls of the anode frame 51 through the bending pipe 9 respectively. A filter screen is fixed at the lower end of the bending pipe 9.

[0050] Specifically, in order to further reduce the waste of cleaning brine, after the aeration pipe 8 fills the left side of the anode frame 51 with high-pressure gas or high-pressure water, the sand layer separated from the surface of the casting is cleaned. At this time, the water pump body on the gantry 59 works, and the upper layer of liquid after static stratification of the cleaning brine on the left side is pumped into the cleaning brine on the right side through the bent pipe 9 on the left side, so as to realize the suction and filtration of the cleaning brine on the left side of the anode frame 51 to the right side for secondary use.

[0051] In the embodiment, high-pressure nozzles 10 are obliquely fixed at two corners of the left side wall of the sand cleaning pool 1, and the nozzles of the high-pressure nozzles 10 face the direction of the clamped casting;

[0052] Specifically, after the cleaning gravel and a small amount of cleaning brine on the left side are discharged, in order to prevent the casting from having residual gravel adhering to the casting and requiring secondary cleaning, the high-pressure nozzle 10 can continue to spray cleaning water to flush the residual gravel adhering to the surface of the casting. At the same time, the flushing water will fall to the bottom of the sand cleaning pool 1 to remove the residual gravel, so that the sand cleaning pool 1 can continue to clean the casting that is suspended and supported again.

[0053] In the embodiment, an elastic sealing membrane 11 is provided for sealing and sliding in the sliding groove opened on the upper surface of the supporting cross frame 2, and one end of the elastic sealing membrane 11 is connected to the side of the L-shaped connecting block 54, and the other end is connected to the groove wall of the sliding groove, which is used to seal the rotating driving screw 3 to prevent sand or cleaning salt water from entering the sliding groove and affecting the normal rotation of the driving screw 3.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A precision casting process for a main frame of a mining machinery, characterized in that: The process includes the following steps: S1: Material preparation: Select high-quality pig iron, scrap steel and alloy materials, mix them according to a certain proportion, and conduct inspection and screening; S2: Material smelting: Add the ingredients into the smelting furnace, raise the temperature to 1550-1620℃, and smelt; during the smelting process, stir the molten iron continuously to make its composition uniform; S3: Casting: Use the bottom pouring method to slowly pour the molten iron into the mold, control the casting temperature to 1300-1400℃, the pouring speed to 1-3kg / s, and the pouring time to 10-20 minutes; S4: Cooling: Use natural cooling to cool the casting to room temperature in air; S5: Subsequent processing: The cooled casting is clamped by the cathode clamp unit (4) and placed into the sand cleaning pool (1), cleaning salt water is added into the sand cleaning pool (1), and a 220V-300V direct current is connected to the anode mechanism (5) and the cathode clamp unit (4) in the sand cleaning pool (1), so that the anode mechanism (5), the cathode clamp unit (4), the cleaning salt water and the casting form an electrical circuit in the sand cleaning pool (1), thereby achieving sand cleaning of the casting; A support rod (42) is fixedly supported above the left end of the sand cleaning pool (1) by a support block (41), and the support rod (42) is used to suspend the casting clamped by the cathode clamp unit (4), and the cathode clamp unit (4) is used to clamp the cooled casting and suspend it in the cleaning brine injected into the sand cleaning pool (1). A support cross frame (2) is symmetrically fixed to the upper box opening in the sand cleaning pool (1), and a driving screw (3) is rotatably arranged in the support cross frame (2), and the symmetrical driving screw (3) is connected to the mesh anode mechanism (5); The anode mechanism (5) comprises an anode frame (51), an anode mesh plate (52), an insulating block (53), an L-shaped connecting block (54), an insulating sealing strip (55) and an anode wire (56); the anode frame (51) is slidably inserted into the sand cleaning tank (1), and a mounting cavity (511) for inserting the anode mesh plate (52) is vertically opened inside the anode frame; the anode mesh plate (52) can be detachably installed in the mounting cavity (511); the wire of the symmetrical driving screw (3) An L-shaped connection block (54) is fixed on the lever nut, and an insulating groove is provided on the side corresponding to the vertical block of the L-shaped connection block (54) and the anode frame (51), and an insulating block (53) is installed in the insulating groove, and the insulating block (53) is symmetrically attached to the front and rear sides of the anode frame (51), and the L-shaped connection block (54) and the insulating block (53) are connected to the anode frame (51) through insulating screws, and the front and rear side walls of the anode frame (51) are sealed and slidably attached through insulating sealing strips (55). The anode frame (51) is connected to the wall of the sand cleaning tank (1); the back of the anode frame (51) is connected to an anode wire (56); the anode wire (56) is connected to the positive pole of the power line; the anode mechanism (5) further comprises an anode plug plate (57), an insulating strip (58), a door frame (59) and a lifting cylinder (591); the anode frame (51) is provided with a plug-in cavity (512), and the plug-in cavity (512) is located at the front side of the installation cavity (511); the plug-in cavity (512) is provided with a positive electrode (56) and a positive electrode (56) is connected to the positive pole of the power line; the anode mechanism (5) further comprises an anode plug plate (57), an insulating strip (58), a door frame (59) and a lifting cylinder (591); the anode frame (51) is provided with a plug-in cavity (512), and the plug-in cavity (512) is located at the front side of the installation cavity (511); An anode plug plate (57) is slidably plugged in, and the anode plug plate (57) is located at the front side of the anode mesh plate (52). The top end of the anode plug plate (57) is connected to an insulating strip (58). The upper surface of the horizontal block of the symmetrical L-shaped connecting block (54) is fixedly connected to the vertical frame of the portal frame (59). At least two lifting cylinders (591) are vertically fixed on the horizontal frame of the portal frame (59), and the lower surface of the piston rod of the lifting cylinder (591) is connected to the insulating strip (58).

2. The precision casting process for a main frame of a mining machinery according to claim 1 is characterized in that: The cathode clamp unit (4) comprises an insulating hook (43), a connecting strip (44), a hook ring (45), a cathode clamp (46), a conductive copper plate (47) and a cathode wire (48). The symmetrical insulating hooks (43) are detachably hung on the support rod (42). The two insulating hooks (43) are connected by a connecting strip (44). A hook ring (45) is vertically fixed in the middle of the connecting strip (44). The bottom end of each insulating hook (43) is insulated and connected to a cathode clamp (46) for clamping the casting. The other clamping jaws of the two cathode clamps (46) are connected by a conductive copper plate (47). The conductive copper plate (47) is connected to a cathode wire (48), and the cathode wire (48) is connected to the negative pole of the power line.

3. The precision casting process for a main frame of a mining machinery according to claim 1 is characterized in that: The right side wall bottom of the sand cleaning tank (1) is connected to an injection pipe (6) for injecting sand cleaning salt water, the left side wall bottom of the sand cleaning tank (1) is connected to a sand discharge pipe (7) for discharging waste sand, the left side wall of the bottom of the sand cleaning tank (1) is connected to an aeration pipe (8), and the pipe opening of the aeration pipe (8) located inside the sand cleaning tank (1) is connected to an aeration hose (81), and the other end of the aeration hose (81) is sealed and connected to the side of the anode frame (51), and the aeration hose (81) is provided with a plurality of aeration holes.

4. The precision casting process for a main frame of a mining machinery according to claim 1 is characterized in that: A water pump body is fixed below the door frame (59) and at a position offset from the lifting cylinder (591). Two ports of the water pump body are connected to the cell body on both side walls of the anode frame (51) through bending pipes (9) respectively. A filter screen is fixed to the lower end of the bending pipe (9).

5. The precision casting process for a main frame of a mining machinery according to claim 1, characterized in that: High-pressure nozzles (10) are obliquely fixed at two corners of the left side wall of the sand cleaning pool (1), and the nozzles of the high-pressure nozzles (10) face the direction of the clamped casting.

6. The precision casting process for a main frame of a mining machinery according to claim 1, characterized in that: An elastic sealing membrane (11) is provided in a sealing and sliding manner in a sliding groove provided on the upper surface of the supporting cross frame (2), and one end of the elastic sealing membrane (11) is connected to the side of the L-shaped connecting block (54), and the other end thereof is connected to the groove wall of the sliding groove.

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