A casting structure of main differential case of engineering machinery

Abstract

The present invention belongs to the technical field of casting equipment, and in particular to a casting structure for a main differential case of an engineering machinery. In view of the problem that a device cannot be used in current casting to realize one-time filling and patting of a sandbox mold, the following solution is proposed, comprising a fixed side frame, wherein the inner wall of the fixed side frame is provided with a slide rail, and a casting sandbox is slidably installed inside the fixed side frame, wherein a cavity is provided inside the casting sandbox, and a wax mold body is placed in the cavity of the casting sandbox. The present invention sets the entire casting process, wherein the wax mold body is fixed and then the sand filling and patting process is carried out automatically, thereby directly making a sand mold, and the wax mold body is made 1:1 for casting a differential case, and is a hollow wax shell with an aluminum bar provided in the wax shell as a support. During the high-temperature mold burning process, the wax liquid is directly vaporized and volatilized, and the internal aluminum bar is melted into aluminum liquid, thereby saving the time for making the sand mold during the casting process and improving the production efficiency of the sand mold.

Description

Technical Field

[0001] The present invention relates to the technical field of casting equipment, and in particular to a casting structure of a main differential case of an engineering machinery. Background Art

[0002] The differential case is one of the core components of the differential. It is mainly used to accommodate components such as planetary gears and axle gears, and transmit power to achieve wheel speed difference adjustment. Its design directly affects the heat dissipation, assembly accuracy and durability of the differential. Common structures include one-piece or split welded housings. In the manufacturing process of differential housings for construction machinery, they are usually manufactured by sand casting. The housing is obtained by casting molten aluminum into the prepared sand mold, and then it is polished to obtain the finished differential housing.

[0003] For example, the Chinese patent document with publication number CN111659858B discloses an efficient die device for sand casting, including a temperature control box, a sand box and a die. A bearing plate is fixedly provided at the lower part of the interior of the temperature control box, the sand box is arranged above the bearing plate, and the bearing plate is connected to a clamping mechanism and is connected to the sand box through the clamping mechanism. The upper end of the temperature control box is fixedly connected to a cylinder through a first through hole, and the output end of the cylinder is fixedly connected to a pressure plate, a mounting seat is provided below the pressure plate, and the lower end of the mounting seat is connected to a mounting mechanism and is connected to the die through the mounting mechanism. In the above-mentioned prior art disclosed, the molding process is too complicated, and two sand boxes need to be made and merged before they can be molded and cast. The device cannot realize one-time filling of sand and patting to make a sand box mold. The prior art is not easy to solve such problems. Therefore, there is an urgent need for a casting structure for the main differential case of engineering machinery to solve the above problems. Summary of the Invention

[0004] Based on the technical problem that the current casting device cannot realize one-time sand filling and patting to make a sand box mold, the present invention proposes a casting structure for the main differential case of engineering machinery.

[0005] The present invention proposes a casting structure for a main differential case of engineering machinery, comprising a fixed side frame, an inner wall of the fixed side frame being installed with a slide rail, a casting sand box being slidably installed inside the fixed side frame, a cavity being provided inside the casting sand box, and a wax mold body being placed in the cavity of the casting sand box, a sand filling mechanism being provided between the two sides of the fixed side frame, a mold burning mechanism being further provided between the two sides of the fixed side frame, and a casting mechanism being further provided between the two sides of the fixed side frame.

[0006] Preferably, sliding brackets are installed on both sides of the casting sand box, and sliding rail wheels are installed at both ends of the sliding brackets through bearings. The sliding rail wheels are rollingly engaged with the two sliding rails at the top and bottom. A casting sand box rotating shaft is fixed on one side of the casting sand box, and a servo is installed in the sliding bracket, and the output shaft of the servo is fixed to the casting sand box rotating shaft.

[0007] Preferably, the sand filling mechanism includes a sand filling box fixed on both sides of a fixed side frame by bolts, two sand guide tube slides are provided on the top of the sand filling box, a horizontal lifting sand filling frame is slidably installed on the bottom of the sand filling box, and two first electric push rods are installed between the lifting sand filling frame and the sand filling box by bolts.

[0008] Preferably, the inner walls on both sides of the lifting sand filling frame are provided with a first side slide groove, a sand-beating machine box is slidably installed between the first side slide grooves on both sides, a first limiting slide rod is fixed in the first side slide groove on one side, and a first driving screw rod is installed in the first side slide groove on the other side through a bearing, the first limiting slide rod and the sand-beating machine box are slidably sleeved, and the first driving screw rod and the sand-beating machine box are threadedly sleeved.

[0009] Preferably, three vertical second electric push rods are fixed to the bottom of the sand-beating machine box, and the same sand-beating block is fixed to the bottom of the three second electric push rods.

[0010] Preferably, two sand-laying slide slots are provided on the top of the lifting sand-filling frame, and the side walls of the two sand-laying slide slots are provided with second side slots, and sand slides are slidably installed inside the two sand-laying slide slots, a second limiting slide rod is fixed in the second side slot on one side, and a second driving screw rod is installed in the second side slot on the other side through a bearing, the second side slot and the sand-laying slide are slidably installed, and the second driving screw rod and the sand-laying slide are threadedly installed.

[0011] Preferably, a sand outlet is provided in the middle of the sand-distributing slide, a sand inlet is installed on the top of the sand filling machine box, a sand inlet support frame is fixed in the middle of the bottom of the sand inlet, a sand inlet pulley is installed on the bottom of the sand inlet support frame through a bearing, a sand inlet pulley groove is provided on the top of the sand filling machine box, the sand inlet pulley and the sand inlet pulley groove are installed in a rolling manner, sand guide cylinders are installed at both ends of the bottom of the sand inlet, the sand guide cylinders are fixed to the top of the sand-distributing slide, and the sand guide cylinders are connected to the sand outlet.

[0012] Preferably, the mold burning mechanism includes a mold burning chassis fixed by bolts on both sides of the fixed side frame, two third electric push rods are installed on the top of the mold burning chassis, and a mold burning top plate is installed at the top position inside the mold burning chassis, the mold burning top plate is fixed to the two third electric push rods on the top, a mold burning tube is fixed on the top of the mold burning top plate, the mold burning tube and the mold burning chassis pass through the middle position of the mold burning chassis, and the mold burning tube and the mold burning chassis are slidably installed, an array-distributed combustion nozzle is fixed to the bottom of the mold burning top plate, a gas pipeline is installed inside the mold burning tube, and the gas pipeline is communicated with the array-distributed combustion nozzle.

[0013] Preferably, the casting mechanism includes a casting box fixed with bolts on both sides of the fixed side frame, two fourth electric push rods are installed on the top of the casting box, and a casting top cover plate is slidably installed inside the casting box, and the top of the casting top cover plate is fixed to the fourth electric push rods.

[0014] Preferably, a casting pipe is fixed on the top of the casting top cover plate, and the casting pipe is installed in a sliding manner between the casting machine box. The casting top cover plate is provided with exhaust holes distributed in an array and arranged through the casting top cover plate.

[0015] The beneficial effects of the present invention are:

[0016] The casting structure of the main differential case of engineering machinery is characterized in that the entire casting process is arranged so that the wax mold body is fixed and then the sand filling and patting process is carried out automatically, so that a sand casting mold is directly produced. The wax mold body is produced in a 1:1 ratio for casting the differential case, and is a wax shell with a hollow interior. Aluminum bars are provided in the wax shell as support. During the high-temperature mold burning process, the wax liquid is directly vaporized and volatilized, and the internal aluminum bars are melted into aluminum liquid. This saves the time for producing the sand mold during the casting process and improves the production efficiency of the sand casting mold.

[0017] The casting structure of the main differential case of the engineering machinery uses a gas pipeline connected to the inside of the burning mold tube to introduce combustion gas, which is ignited by the combustion nozzle and heats the casting sand box. The temperature of the casting sand box is 950-1200℃. At this temperature, the wax liquid will vaporize and evaporate, and the aluminum will also melt at this temperature. After heating the casting sand box, the early heat treatment can also prevent the sand mold from expanding and deforming due to instantaneous contact with the high-temperature aluminum liquid in the subsequent casting process.

[0018] The main differential case casting structure of the engineering machinery has a casting sand box that moves to one end position after casting is completed. After waiting for cooling and forming, the steering gear controls the casting sand box to flip and dump the sand mold to obtain the casting of the differential case. The casting sand box is flipped by the steering gear to discharge the material, which saves manpower operation and improves the efficiency of the casting process. The casting of large parts can also be conveniently flipped and discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a casting structure of a main differential case of an engineering machinery proposed by the present invention;

[0020] Figure 2 This is a schematic diagram of a casting sandbox structure for a main differential case casting structure of an engineering machinery proposed by the present invention;

[0021] Figure 3 This is a schematic structural diagram of a sand filling mechanism for a casting structure of a main differential case of an engineering machinery proposed by the present invention;

[0022] Figure 4 This is a schematic diagram of the sand-slapping block structure of a main differential case casting structure of an engineering machinery proposed by the present invention;

[0023] Figure 5 This invention proposes a casting structure for the main differential case of engineering machinery Figure 4 A schematic diagram of the enlarged structure of part A;

[0024] Figure 6 This is a schematic diagram of the die burning mechanism structure of the main differential case casting structure of an engineering machinery proposed by the present invention;

[0025] Figure 7 This is a schematic diagram of the casting mechanism structure of a main differential case casting structure of an engineering machinery proposed by the present invention.

[0026] Figure: 1. Fixed side frame; 2. Slide rail; 3. Casting sand box; 4. Wax mold body; 5. Sand filling machine box; 6. Mold burning machine box; 7. Casting machine box; 8. Sand feed hopper; 9. Third electric push rod; 10. Mold burning tube; 11. Fourth electric push rod; 12. Casting tube; 13. Sliding bracket; 14. Casting sand box rotating shaft; 15. Slide rail transfer wheel; 16. Lifting sand filling frame; 17. First electric push rod; 18. Sand feed hopper support frame; 19. Sand feed hopper pulley; 20. Sand guide tube ; 21. Sand inlet hopper pulley groove; 22. Sand guide tube slide; 23. Sand distribution slide slot; 24. Sand distribution slide; 25. Sand outlet; 26. First drive screw; 27. First limit slide; 28. Sand slapping machine chassis; 29. ​​Second electric push rod; 30. Sand slapping block; 31. First side slide; 32. Second side slide; 33. Second drive screw; 34. Second limit slide; 35. Burning mold top plate; 36. Combustion nozzle; 37. Casting top cover plate; 38. Exhaust hole. DETAILED DESCRIPTION

[0027] Reference Figure 1-Figure 7A casting structure of a main differential case of an engineering machinery includes a fixed side frame 1, a slide rail 2 is installed on the inner wall of the fixed side frame 1, a casting sand box 3 is slidably installed inside the fixed side frame 1, a cavity is provided inside the casting sand box 3, and a wax mold body 4 is placed in the cavity of the casting sand box 3, a sand filling mechanism is provided between the two sides of the fixed side frame 1, a mold burning mechanism is also provided between the two sides of the fixed side frame 1, and a casting mechanism is also provided between the two sides of the fixed side frame 1.

[0028] Reference Figure 2 Furthermore, sliding brackets 13 are installed on both sides of the casting sand box 3, and sliding rail wheels 15 are installed at both ends of the sliding bracket 13 through bearings. The sliding rail wheels 15 are rollingly engaged with the two slide rails 2 at the top and bottom. A casting sand box rotating shaft 14 is fixed to one side of the casting sand box 3, and a steering gear is installed in the sliding bracket 13, and the output shaft of the steering gear is fixed to the casting sand box rotating shaft 14; the sliding rail wheels 15 on the sliding bracket 13 are rollingly engaged with the two slide rails 2, so that the casting sand box 3 can move on the fixed side frame 1, and the casting sand box 3 can be flipped by the control of the steering gear.

[0029] Reference Figure 3 Furthermore, the sand filling mechanism includes a sand filling box 5 fixed by bolts on both sides of the fixed side frame 1, two sand guide tube slides 22 are provided on the top of the sand filling box 5, and a horizontal lifting sand filling frame 16 is slidably installed on the bottom of the sand filling box 5. Two first electric push rods 17 are installed between the lifting sand filling frame 16 and the sand filling box 5 by bolts; the first electric push rods 17 control the height of the lifting sand filling frame 16 so that the lifting sand filling frame 16 is aligned with the top of the casting sand box 3.

[0030] Reference Figure 4 The first driving screw rod 26 is slidably mounted between the first limiting sliding rod 27 and the sand slapping box 28, and the first driving screw rod 26 is threadedly mounted between the first limiting sliding rod 27 and the sand slapping box 28. The bottom of the sand slapping box 28 is fixed with three vertical second electric push rods 29, and the bottom of the three second electric push rods 29 is fixed with the same sand slapping block 30; the first driving screw rod 26 is driven by the motor to rotate, so that the position of the sand slapping box 28 is moved and adjusted, and the reciprocating work of the second electric push rod 29 beats the sand material in the casting sand box 3 through the sand slapping block 30, so that the sand material and the wax mold body 4 are filled tightly and the air is discharged.

[0031] Reference Figure 3-Figure 5Furthermore, two sand-laying slide slots 23 are provided on the top of the lifting sand-filling frame 16, and the side walls of the two sand-laying slide slots 23 are provided with second side slots 32, and sand-laying slides 24 are slidably installed inside the two sand-laying slide slots 23. A second limiting slide rod 34 is fixed in the second side slot 32 on one side, and a second driving screw rod 33 is installed in the second side slot 32 on the other side through a bearing. The second side slot 32 and the sand-laying slide 24 are slidably sleeved and installed, and the second driving screw rod 33 and the sand-laying slide 24 are threadedly sleeved. A sand outlet 25 is provided in the middle of the sand-laying slide 24, and a sand inlet hopper 8 is installed on the top of the sand-filling machine case 5. A sand feeding hopper support frame 18 is fixed in the middle of the bottom of the sand feeding hopper 8, and a sand feeding hopper pulley 19 is installed at the bottom of the sand feeding hopper support frame 18 through a bearing. A sand feeding hopper pulley groove 21 is opened on the top of the sand filling machine case 5, and the sand feeding hopper pulley 19 is installed with the sand feeding hopper pulley groove 21 in a rolling manner. Sand guide cylinders 20 are installed at both ends of the bottom of the sand feeding hopper 8, and the sand guide cylinder 20 is fixed to the top of the sand distribution slide 24, and the sand guide cylinder 20 is connected to the sand outlet 25; the second driving screw rod 33 adjusts the position of the sand distribution slide 24 to fill the casting sand box 3 with sand, and a telescopic tube is connected between the sand distribution slide 24 and the sand guide cylinder 20, and sand material is added through the sand feeding hopper 8 at the top.

[0032] Reference Figure 1 and Figure 6 Furthermore, the mold burning mechanism includes a mold burning chassis 6 fixed by bolts on both sides of the fixed side frame 1, two third electric push rods 9 are installed on the top of the mold burning chassis 6, and a mold burning top plate 35 is installed at the top position inside the mold burning chassis 6. The mold burning top plate 35 is fixed to the two third electric push rods 9 on the top, and a mold burning tube 10 is fixed on the top of the mold burning top plate 35. The mold burning tube 10 and the mold burning chassis 6 pass through the middle position of the mold burning chassis 6, and the mold burning tube 10 and the mold burning chassis 6 are slidably installed. The bottom of the mold burning top plate 35 is fixed with an array of combustion nozzles. Head 36, a gas pipeline is installed inside the burning mold tube 10, and the gas pipeline is connected to the combustion nozzles 36 distributed in an array; the gas pipeline connected to the inside of the burning mold tube 10 introduces combustion gas, which is ignited through the combustion nozzles 36 and heats the casting sand box 3. The temperature of the combustion and heating of the casting sand box 3 is 950-1200℃. At this temperature, the wax liquid will vaporize and evaporate, and the aluminum will also melt at this temperature. After heating the casting sand box 3, the early heat treatment can also prevent the sand mold from expanding and deforming due to instantaneous contact with the high-temperature aluminum liquid in the subsequent casting process.

[0033] Reference Figure 1 and Figure 7Furthermore, the casting mechanism includes a casting box 7 fixed with bolts on both sides of the fixed side frame 1, two fourth electric push rods 11 are installed on the top of the casting box 7, and a casting top cover plate 37 is slidably installed inside the casting box 7. The top of the casting top cover plate 37 is fixed to the fourth electric push rod 11, and a casting pipe 12 is fixed on the top of the casting top cover plate 37. The casting pipe 12 is slidably installed between the casting box 7, and the casting top cover plate 37 is provided with an array-distributed and penetrating exhaust holes 38; the aluminum liquid is cast into the interior of the sand mold through the casting pipe 12 on the top, and the gas generated by the internal casting can be discharged through the exhaust holes 38. During the casting process, the casting top cover plate 37 is fitted to the top of the sand mold by the fourth electric push rod 11.

[0034] When the present invention is used: the wax mold body 4 is prefabricated in advance, wherein the wax mold body 4 is manufactured according to the casting differential housing 1:1, which is a hollow wax shell inside, and an aluminum bar is provided in the wax shell as a support, the wax mold body 4 is placed in the casting sand box 3 and fixed and stable, and the top of the wax mold body 4 is kept level with the top of the casting sand box 3, and the casting sand box 3 enters the interior of the sand filling machine box 5 through the movement of the sliding bracket 13, and the height of the lifting sand filling frame 16 is controlled by the first electric push rod 17. A telescopic tube is installed between the sand-laying slide 24 and the sand-guiding tube 20. When the wax mold body 4 is filled with sand, sand is put into the sand hopper 8 at the top, and the sand outlet 25 on the sand-laying slide 24 is used to introduce sand into the casting sand box 3. The second driving screw 33 is driven by the motor to move the sand-laying slide 24 to fill the position where sand needs to be filled. After filling the sand, the first driving screw 26 is driven by the motor to move the position of the sand-slapping chassis 28, and the reciprocating action of the second electric push rod 29 causes the sand-slapping block 3 to move. 0 Pat the filled sand material, repeat the action of filling sand and patting to make the sand material fully contact with the wax mold body 4 to exhaust the air, and the casting sand box 3 with the sand mold made is moved to the bottom of the mold burning machine box 6. A plurality of combustion nozzles 36 are set at the bottom of the mold burning top plate 35 in the mold burning machine box 6 to heat the top of the casting sand box, and the heating temperature is maintained at 950-1200℃. The molten wax liquid is quickly vaporized and volatilized in a high temperature environment, and the aluminum strips in the wax mold body 4 are melted at high temperature. After the mold is burned, The casting sand box 3 is moved into the casting machine box 7. After the casting sand box 3 is aligned with the casting machine box 7, the fourth electric push rod 11 adjusts the casting top cover plate 37 to descend and fit the top of the casting sand box 3. The molten aluminum liquid is introduced through the casting pipe 12 to cast the sand mold in the casting sand box 3. The exhaust hole 38 discharges the casting gas. After the casting is completed, the casting sand box 3 moves to one end position, waits for cooling and forming, and then the steering gear controls the casting sand box 3 to flip the sand mold to obtain the casting of the differential case.

[0035] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A casting structure of a main differential case of an engineering machinery, comprising a fixed side frame (1), wherein a slide rail (2) is installed on the inner wall of the fixed side frame (1), characterized in that: A casting sand box (3) is slidably mounted inside the fixed side frame (1), a cavity is provided inside the casting sand box (3), and a wax mold body (4) is placed in the cavity of the casting sand box (3), a sand filling mechanism is provided between the two sides of the fixed side frame (1), a mold burning mechanism is also provided between the two sides of the fixed side frame (1), and a casting mechanism is also provided between the two sides of the fixed side frame (1); The sand filling mechanism comprises a sand filling machine box (5) fixed on both sides of a fixed side frame (1) by bolts, two sand guide tube slides (22) are provided on the top of the sand filling machine box (5), a horizontal lifting sand filling frame (16) is slidably mounted on the bottom of the sand filling machine box (5), and two first electric push rods (17) are mounted between the lifting sand filling frame (16) and the sand filling machine box (5) by bolts; The inner walls of both sides of the lifting sand filling frame (16) are provided with first side slide grooves (31), a sand slapping machine box (28) is slidably installed between the first side slide grooves (31) at both sides, a first limiting slide rod (27) is fixed in the first side slide groove (31) at one side, a first driving screw rod (26) is installed in the first side slide groove (31) at the other side through a bearing, the first limiting slide rod (27) and the sand slapping machine box (28) are slidably sleeved, the first driving screw rod (26) and the sand slapping machine box (28) are threadedly sleeved, three vertical second electric push rods (29) are fixed at the bottom of the sand slapping machine box (28), and the bottom of the three second electric push rods (29) is fixed with the same sand slapping block (30); Two sand-laying slide slots (23) are provided on the top of the lifting sand-filling frame (16), and the side walls of the two sand-laying slide slots (23) are provided with second side slots (32), and sand-laying slides (24) are slidably installed inside the two sand-laying slide slots (23), a second limiting slide rod (34) is fixed in the second side slot (32) on one side, and a second driving screw rod (33) is installed in the second side slot (32) on the other side through a bearing, the second side slot (32) and the sand-laying slide (24) are slidably sleeved, and the second driving screw rod (33) and the sand-laying slide (24) are threadedly sleeved; A sand outlet (25) is provided in the middle of the sand distribution slide (24), a sand feed hopper (8) is installed on the top of the sand filling machine box (5), a sand feed hopper support frame (18) is fixed in the middle of the bottom of the sand feed hopper (8), a sand feed hopper pulley (19) is installed on the bottom of the sand feed hopper support frame (18) through a bearing, a sand feed hopper pulley groove (21) is provided on the top of the sand filling machine box (5), the sand feed hopper pulley (19) and the sand feed hopper pulley groove (21) are installed in a rolling and clamping manner, and sand guide cylinders (20) are installed at both ends of the bottom of the sand feed hopper (8), the sand guide cylinder (20) is fixed to the top of the sand distribution slide (24), and the sand guide cylinder (20) and the sand outlet (25) are connected; The die burning mechanism includes a die burning machine case (6) fixed by bolts at both sides of a fixed side frame (1), two third electric push rods (9) are installed on the top of the die burning machine case (6), and a die burning top plate (35) is installed at the top position inside the die burning machine case (6), the die burning top plate (35) and the two third electric push rods (9) on the top are fixed, a die burning tube (10) is fixed on the top of the die burning top plate (35), the die burning tube (10) and the die burning machine case (6) pass through the middle position of the die burning machine case (6), and the die burning tube (10) and the die burning machine case (6) are slidably installed, an array of combustion nozzles (36) are fixed on the bottom of the die burning top plate (35), a gas pipeline is installed inside the die burning tube (10), and the gas pipeline is connected to the array of combustion nozzles (36).

2. The casting structure of the main differential case of engineering machinery according to claim 1, characterized in that: Sliding brackets (13) are installed at both sides of the casting sand box (3), and sliding rail wheels (15) are installed at both ends of the sliding bracket (13) through bearings. The sliding rail wheels (15) are rollingly engaged with the two sliding rails (2) at the top and bottom. A casting sand box rotating shaft (14) is fixed to one side of the casting sand box (3), and a steering gear is installed in the sliding bracket (13), and the output shaft of the steering gear is fixed to the casting sand box rotating shaft (14).

3. The casting structure of the main differential case of engineering machinery according to claim 1, characterized in that: The casting mechanism comprises a casting box (7) fixed by bolts on both sides of a fixed side frame (1); two fourth electric push rods (11) are installed on the top of the casting box (7); a casting top cover plate (37) is slidably installed inside the casting box (7); the top of the casting top cover plate (37) is fixed to the fourth electric push rod (11).

4. The casting structure of the main differential case of engineering machinery according to claim 3, characterized in that: A casting pipe (12) is fixed on the top of the casting top cover plate (37), and the casting pipe (12) is slidably mounted on the casting machine box (7). The casting top cover plate (37) is provided with exhaust holes (38) distributed in an array and arranged through the top cover plate.

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