Cast iron gearbox

Abstract

The invention relates to the field of gear boxes, in particular to a cast iron gear box which comprises a box body, a gear set, a spray pipe and a high-pressure spray head, the box body is provided with a containing cavity, the gear set is connected to the inner wall of the containing cavity, the spray pipe is fixedly connected to the inner wall of the containing cavity, and a liquid outlet is formed in the outer wall of the spray pipe. The high-pressure spray head is fixedly connected to the outer wall of the spray pipe, and a spray opening is formed in the end, facing the gear set, of the high-pressure spray head and communicates with the liquid outlet. Oil liquid is sprayed out of the nozzle, the oil liquid is atomized through the high-pressure spray head and then directly sprayed to the gear set, oil drops evaporate, absorb heat and strengthen heat dissipation, the heat dissipation efficiency of the gear set is improved, and the service life of the gear box is prolonged.

Description

Technical Field

[0001] The present application relates to the field of gearboxes, and in particular to a cast iron gearbox. Background Art

[0002] A gearbox is a mechanical device used to transmit power and speed. It consists of multiple gears and transmits power through the meshing and rotation of the gears. Its main function is to change the speed and torque of the input shaft to adapt to different working requirements.

[0003] The gearbox generates heat when working. If the oil temperature is too high, it will lead to poor lubrication, thereby increasing the friction between the gears, causing overheating and affecting the service life of the gearbox. Summary of the Invention

[0004] In order to extend the service life of the gearbox, the present application provides a cast iron gearbox.

[0005] The present application provides a cast iron gearbox adopting the following technical solution: A cast iron gearbox includes a box body, a gear set, a nozzle and a high-pressure nozzle. The box body is provided with a accommodating chamber, the gear set is connected to the inner wall of the accommodating chamber, the nozzle is fixedly connected to the inner wall of the accommodating chamber, the outer wall of the nozzle is provided with a liquid outlet, the high-pressure nozzle is fixedly connected to the outer wall of the nozzle, and the high-pressure nozzle is provided with a nozzle at one end facing the gear set, and the nozzle is connected to the liquid outlet.

[0006] By adopting the above technical solution, the oil is sprayed out from the nozzle, and the oil is atomized by the high-pressure nozzle and then sprayed directly onto the gear set. The oil droplets evaporate and absorb heat to enhance heat dissipation, thereby improving the heat dissipation efficiency of the gear set and extending the service life of the gearbox.

[0007] Preferably, a water pump is further included, which includes a pump casing, a rotating column and an impeller, the pump casing is provided with a pump chamber, the pump casing is provided with a water inlet and a water outlet, the rotating column is coaxially rotatably connected to the inner wall of the pump chamber, the impeller is coaxially fixedly connected to the outer wall of the rotating column, the water inlet and the water outlet are respectively provided on both sides of the impeller, the nozzle is provided with a liquid inlet, and the water outlet is connected to the liquid inlet.

[0008] By adopting the above technical solution, the water pump works to provide oil to the nozzle and pressurizes the oil so that the oil is ejected from the nozzle to dissipate heat for the gear set.

[0009] Preferably, it also includes an oil tank, which is fixedly connected to the lower end of the box body. The lower end of the box body is provided with an oil outlet, and the oil outlet is connected to the accommodating cavity. The oil tank is provided with an oil cavity, and the oil outlet and water inlet are both connected to the oil cavity.

[0010] By adopting the above technical solution, the oil in the box is discharged from the oil outlet into the oil cavity, and the oil in the oil cavity is convenient for heat dissipation. The oil enters the water pump from the water inlet and is discharged from the water outlet, thereby realizing oil circulation, reducing the oil temperature, facilitating heat dissipation of the gear set, and extending the service life of the gear box.

[0011] Preferably, a transmission member is further included, the water pump is fixedly connected to the inner wall of the oil chamber, and the rotating column is connected to the gear set through the transmission member.

[0012] By adopting the above technical solution, while the gear set is working, the rotating column is driven to rotate through the transmission member, so that the water pump works and oil circulation is realized, which is convenient for heat dissipation of the gear set and prolongs the service life of the gear box.

[0013] Preferably, the gear set includes an input shaft, an output shaft, a fixed column, an input gear, an output gear, a first bearing and a transition gear, the outer wall of the box body is provided with an input port and an output port, the input port and the output port are both communicated with the accommodating chamber, the input shaft is coaxially rotatably connected to the inner wall of the input port, the output shaft is coaxially rotatably connected to the inner wall of the output port, the fixed column is arranged between the input shaft and the output shaft, the fixed column is fixedly connected to the inner wall of the accommodating chamber, the axes of the input port, the output port and the fixed column are all parallel to each other, the input gear, output gear and transition gear are all arranged in the accommodating chamber, the input gear is coaxially fixedly connected to the outer wall of the input shaft, the output gear is coaxially fixedly connected to the outer wall of the output shaft, the first bearing is coaxially fixedly connected to the outer wall of the fixed column, the transition gear is coaxially fixedly connected to the outer wall of the first bearing, two ends of the transition gear are respectively meshed with the input gear and the output gear, and the rotating column is meshed with the input gear through a transmission member.

[0014] By adopting the above technical solution, the input shaft rotates, the input gear rotates, the transition gear rotates, the output gear rotates, and the output shaft rotates. Through the engagement of multiple gears, the output shaft speed is changed to meet user needs. While the input gear rotates, the rotating column is driven to rotate through the transmission member to improve heat dissipation efficiency.

[0015] Preferably, the transmission member includes a support column and a control gear, the support column is arranged on the side of the input gear away from the transition gear, the axis of the support column is parallel to the axis of the input shaft, the support column rotates around its own axis and is connected to the inner wall of the accommodating cavity, the control gear is coaxially fixedly connected to the outer wall of the support column, the control gear is engaged with the input gear, one end of the support column extends into the oil cavity, one end of the rotating column extends out of the pump cavity, and the support column is coaxially fixedly connected to the rotating column.

[0016] By adopting the above technical solution, the input gear drives the support column to rotate through the control gear, thereby causing the rotating column to rotate, making it easier to control the rotation of the impeller and realize oil circulation.

[0017] Preferably, the impeller includes a fixing ring, blades and a first heat expansion block, the fixing ring is coaxially fixedly connected to the outer wall of the rotating column, the blades are fixedly connected to the fixing ring, a plurality of blades are provided, and the plurality of blades are evenly spaced around the axis of the fixing ring, and the first heat expansion block is fixedly connected to the end of the blade away from the fixing ring.

[0018] By adopting the above technical solution, when the oil temperature is high, the first heated expansion block expands due to the heat, the impeller diameter increases, the oil flow rate entering the nozzle increases, the oil circulation rate is improved, and the heat dissipation of the gear set is facilitated.

[0019] Preferably, it also includes a connecting pipe, the upper end of the box body is provided with an exhaust port, the outer wall of the box body is provided with a connecting port, the exhaust port and the connecting port are both connected to the accommodating cavity, the connecting pipe is provided on the outer periphery of the box body, one end of the connecting pipe is coaxially fixedly connected to the inner wall of the exhaust port, the connecting pipe is coaxially fixedly connected to the inner wall of the connecting port, the connecting pipe is connected to the accommodating cavity, and the end of the connecting pipe away from the exhaust port opens toward the first bearing.

[0020] By adopting the above technical solution, hot gas carrying oil droplets is discharged from the exhaust port, enters the connecting pipe and exchanges heat with the outside world to achieve cooling. The oil droplets slide along the inner wall of the connecting pipe and drip onto the first bearing, which facilitates lubrication of the first bearing and reduces heat.

[0021] Preferably, a vent plug is further included, the outer wall of the connecting pipe is provided with a vent, and the vent plug is fixedly connected to the inner wall of the vent.

[0022] By adopting the above technical solution, the vent plug is convenient for ventilation with the outside world, which is convenient for cooling the gear box and improving the heat dissipation efficiency.

[0023] Preferably, the device further includes a second heated expansion block and an insulation board, one end of the second heated expansion block is fixedly connected to the inner wall of the nozzle, and the other end of the second heated expansion block is fixedly connected to the insulation board, and the second heated expansion block is used to change the size of the nozzle.

[0024] By adopting the above technical solution, when the ambient temperature is too high, the second heat-expanding block expands due to heat to push the heat insulation plate to move, change the size of the nozzle, increase the oil injection rate, and facilitate flushing and cooling of the gear set.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The oil is sprayed out of the nozzle, and the high-pressure nozzle is used to atomize the oil and then spray it directly on the gear set. The oil droplets evaporate and absorb heat to enhance heat dissipation, thereby improving the heat dissipation efficiency of the gear set and extending the service life of the gearbox; 2. When the oil temperature is high, the first heated expansion block expands due to the heat, the impeller diameter increases, the oil flow rate entering the nozzle increases, the oil circulation rate is improved, and the heat dissipation of the gear set is facilitated; 3. When the ambient temperature is too high, the second heat expansion block expands due to heat and pushes the heat insulation plate to move, changing the size of the nozzle and increasing the oil injection rate, which facilitates flushing and cooling of the gear set. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the cast iron gearbox.

[0027] Figure 2 It is a cross-sectional view of a cast iron gearbox.

[0028] Figure 3 A cross-section of a cast iron gearbox showing the cooling components.

[0029] Figure 4 yes Figure 2 Enlarged view of point A in the middle.

[0030] Figure 5 yes Figure 2 Enlarged view of point B in the middle.

[0031] Figure 6 yes Figure 2 Enlarged view of point C in the middle.

[0032] Explanation of reference numerals: 1. housing; 11. accommodating chamber; 12. input port; 13. output port; 14. oil outlet; 15. exhaust port; 16. communication port; 2. gear set; 21. input shaft; 22. output shaft; 23. fixing column; 24. input gear; 25. output gear; 26. first bearing; 27. transition gear; 3. cooling assembly; 31. nozzle; 311. liquid inlet; 312. liquid outlet; 32. high-pressure nozzle; 321. nozzle; 33. second heated expansion block; 34. heat shield; 4. circulation assembly; 41. oil tank; 411. oil chamber; 42. water pump; 42 1. Pump casing; 4211. Pump chamber; 4212. Water inlet; 4213. Water outlet; 422. Rotating column; 423. First impeller; 4231. Fixed ring; 4232. Blade; 4233. First thermal expansion block; 43. Water pipe; 44. Transmission member; 441. Support column; 442. Control gear; 45. Connecting pipe; 451. Straight pipe; 4511. Air vent; 452. Bend pipe; 46. Air plug; 5. Auxiliary components; 51. Scraper; 52. Guide ring; 53. Push rod; 54. Hanging column; 55. Transmission column; 56. Second impeller; 57. Crank; 58. Connecting rod. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-6This application is described in further detail.

[0034] The present application embodiment discloses a cast iron gearbox. Figure 1 and Figure 2 The cast iron gearbox includes a box body 1, a gear set 2, a cooling component 3, a circulation component 4 and an auxiliary component 5.

[0035] Reference Figure 2 The material of the housing 1 is cast iron, and the housing 1 is provided with a housing cavity 11, and the gear set 2 is connected to the inner wall of the housing cavity 11. The gear set 2 includes an input shaft 21, an output shaft 22, a fixing column 23, an input gear 24, an output gear 25, a first bearing 26 and a transition gear 27. The outer wall of the housing 1 is provided with an input port 12 and an output port 13, and the input port 12 and the output port 13 are both connected to the housing cavity 11. The height of the input port 12 is less than the height of the output port 13, and the axis of the input port 12 is parallel to the axis of the output port 13. The input shaft 21 is coaxially connected to the inner wall of the input port 12 through a bearing, and the output shaft 22 is coaxially connected to the inner wall of the output port 13 through a bearing. The fixing column 23 is provided between the input shaft 21 and the output Between the output shaft 22, both ends of the fixed column 23 are fixedly connected to the inner wall of the accommodating chamber 11, the axis of the fixed port and the axis of the output port 13 are parallel to each other, the first bearing 26 is coaxially fixedly connected to the outer wall of the fixed column 23, the input gear 24, the output gear 25 and the transition gear 27 are all arranged in the accommodating chamber 11, the input gear 24 is coaxially fixedly connected to the outer wall of the input shaft 21, the output gear 25 is coaxially fixedly connected to the outer wall of the output shaft 22, the transition gear 27 is coaxially fixedly connected to the outer wall of the first bearing 26, and the two ends of the transition gear 27 are respectively engaged with the input gear 24 and the output gear 25.

[0036] Reference Figure 3 and Figure 4 The cooling assembly 3 includes a nozzle 31, a high-pressure nozzle 32, a second heat expansion block 33 and a heat insulation plate 34. The nozzle 31 is fixedly connected to the inner wall of the accommodating cavity 11 and is located directly above the output gear 25.

[0037] Reference Figure 2 and Figure 3 A liquid inlet 311 is provided at the upper end of the nozzle 31, and a liquid outlet 312 is provided on the outer wall of the nozzle 31. There are multiple liquid outlets 312, and the multiple liquid outlets 312 are evenly spaced along the extension direction of the nozzle 31. The high-pressure nozzle 32 is fixedly connected to the outer wall of the nozzle 31.

[0038] Reference Figure 3 and Figure 4The high-pressure nozzle 32 has a nozzle 321 at the end facing the gear set 2. The nozzle 321 is connected to the liquid outlet 312, and the cross-sectional area of ​​the nozzle 321 decreases as it moves away from the nozzle 31. The nozzle 31 and the high-pressure nozzle 32 are both made of cast iron. One end of the second thermal expansion block 33 is fixedly connected to the inner wall of the nozzle 321, and the other end of the second thermal expansion block 33 is fixedly connected to the insulation board 34. The second thermal expansion block 33 is used to adjust the size of the nozzle 321.

[0039] Reference Figure 2 and Figure 3 The circulation component 4 includes an oil tank 41, a water pump 42, a water pipe 43, a transmission part 44, a connecting pipe 45 and a breathable plug 46. The oil tank 41 is fixedly connected to the lower end of the box body 1. The lower end of the box body 1 is provided with an oil outlet 14, and the oil outlet 14 is connected to the accommodating chamber 11. The oil tank 41 is provided with an oil chamber 411, and the oil outlet 14 is connected to the oil chamber 411.

[0040] Reference Figure 1 and Figure 5 The water pump 42 includes a pump housing 421, a rotating column 422, and a first impeller 423. The first impeller 423 includes a fixed ring 4231, blades 4232, and a first heat expansion block 4233. The water pump 42 is disposed in the oil chamber 411. The pump housing 421 is fixedly connected to the inner wall of the oil chamber 411. The pump housing 421 is provided with a pump chamber 4211. The pump housing 421 is provided with a water inlet 4212 and a water outlet 4213. The rotating column 422 is coaxially rotatably connected to the inner wall of the pump chamber 4211. The fixed ring 4231 is coaxially fixedly connected to the outer wall of the rotating column 422. The blades 4232 are fixedly connected to the fixed ring 4231. There are multiple blades 4232, and the multiple blades 4232 are evenly spaced around the axis of the fixed ring 4231. The first heat expansion block 4233 is fixedly connected to the end of the blade 4232 away from the fixed ring 4231. The water inlet 4212 and the water outlet 4213 are respectively provided on both sides of the first impeller 423 . The water inlet 4212 is connected to the oil chamber 411 , and the water outlet 4213 is connected to the liquid inlet 311 through the water pipe 43 .

[0041] Reference Figure 2 and Figure 5The rotation axis of the rotating column 422 is parallel to the axis of the input shaft 21. The rotating column 422 is engaged with the input gear 24 through the transmission member 44. The transmission member 44 includes a support column 441 and a control gear 442. The support column 441 is arranged on the side of the input gear 24 away from the transition gear 27. The axis of the support column 441 is parallel to the axis of the input shaft 21. The support column 441 rotates around its own axis and is connected to the inner wall of the accommodating chamber 11. The control gear 442 is coaxially fixedly connected to the outer wall of the support column 441. The control gear 442 is engaged with the input gear 24. One end of the support column 441 extends into the oil chamber 411, and one end of the rotating column 422 extends out of the pump chamber 4211. The support column 441 is coaxially fixedly connected to the rotating column 422.

[0042] Reference Figure 2 The upper end of the housing 1 is provided with an exhaust port 15, and the outer wall of the housing 1 is provided with a communication port 16, which is located above the fixing column 23. Both the exhaust port 15 and the communication port 16 are connected to the accommodating chamber 11. A connecting pipe 45 is provided on the outer periphery of the housing 1. The connecting pipe 45 includes a straight pipe 451 and a curved pipe 452. One end of the straight pipe 451 is coaxially fixedly connected to the inner wall of the exhaust port 15, and the other end of the straight pipe 451 is coaxially fixedly connected to one end of the curved pipe 452. The curved pipe 452 is coaxially fixedly connected to the inner wall of the communication port 16. The curved pipe 452 is connected to the accommodating chamber 11, and the end of the curved pipe 452 away from the straight pipe 451 opens toward the first bearing 26. The outer wall of the straight pipe 451 is provided with an air vent 4511, and a vent plug 46 is fixedly connected to the inner wall of the air vent 4511. One end surface of the vent plug 46 is coplanar with the inner wall of the straight pipe 451, and the axis of the straight pipe 451 is vertical.

[0043] Reference Figure 4 and Figure 6The auxiliary component 5 includes a scraper 51, a guide ring 52, a mandrel 53, a suspension column 54, a transmission column 55, a second impeller 56, a crank 57 and a connecting rod 58. The scraper 51 is slidably connected to the inner wall of the straight pipe 451. The scraper 51 is used to clean the end face of the air vent plug 46. The guide ring 52 is provided below the scraper 51. The guide ring 52 is fixedly connected to the inner wall of the straight pipe 451. The upper end of the mandrel 53 fixes the scraper 51. The mandrel 53 is slidably connected to the inner wall of the guide ring 52. The suspension column 54 is provided between the nozzle 31 and the straight pipe 451. The suspension column 54 is fixedly connected to the inner wall of the accommodating chamber 11. The transmission column 55 is connected to the suspension column 54 in a manner that it rotates around its own axis. The rotation axis of the transmission column 55 is horizontal. The second impeller 56 and the crank 57 are respectively arranged on both sides of the suspension column 54. The second impeller 56 is arranged between the suspension column 54 and the nozzle 31. The second impeller 56 is coaxially fixedly connected to the outer wall of the transmission column 55. The second impeller 56 is arranged below the high-pressure nozzle 32. The oil mist sprayed by the high-pressure nozzle 32 drives the second impeller 56 to rotate. One end of the crank 57 is fixedly connected to the outer wall of the transmission column 55, one end of the connecting rod 58 is hinged to the end of the crank 57 away from the transmission column 55, and the other end of the connecting rod 58 is hinged to the lower end of the top rod 53.

[0044] The implementation principle of a cast iron gearbox in an embodiment of the present application is as follows: the cooling component 3 cools the gear set 2, the circulation component 4 circulates the oil to supply oil to the cooling component 3, thereby improving the cooling efficiency. At the same time, the meshing between the gears and the bearings are lubricated to reduce heat generation, and the auxiliary component 5 clears the air plug 46 through the rotation of the impeller to reduce blockage.

[0045] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A cast iron gearbox, characterized in that: The invention comprises a housing (1), a gear set (2), a nozzle (31) and a high-pressure nozzle (32), wherein the housing (1) is provided with a housing chamber (11), the gear set (2) is connected to the inner wall of the housing chamber (11), the nozzle (31) is fixedly connected to the inner wall of the housing chamber (11), the outer wall of the nozzle (31) is provided with a liquid outlet (312), the high-pressure nozzle (32) is fixedly connected to the outer wall of the nozzle (31), and the high-pressure nozzle (32) is provided with a nozzle (321) at one end of the high-pressure nozzle (32) facing the gear set (2), and the nozzle (321) is connected to the liquid outlet (312).

2. The cast iron gearbox according to claim 1, characterized in that: The device further comprises a water pump (42), the water pump (42) comprising a pump housing (421), a rotating column (422) and an impeller, the pump housing (421) being provided with a pump chamber (4211), the pump housing (421) being provided with a water inlet (4212) and a water outlet (4213), the rotating column (422) being coaxially rotatably connected to the inner wall of the pump chamber (4211), the impeller being coaxially fixedly connected to the outer wall of the rotating column (422), the water inlet (4212) and the water outlet (4213) being respectively provided on both sides of the impeller, the nozzle (31) being provided with a liquid inlet (311), and the water outlet (4213) being connected to the liquid inlet (311).

3. The cast iron gearbox according to claim 2, characterized in that: The oil tank (41) is further comprised. The oil tank (41) is fixedly connected to the lower end of the box body (1). The lower end of the box body (1) is provided with an oil outlet (14). The oil outlet (14) is communicated with the accommodating cavity (11). The oil tank (41) is provided with an oil cavity (411). The oil outlet (14) and the water inlet (4212) are both communicated with the oil cavity (411).

4. The cast iron gearbox according to claim 3, characterized in that: It also includes a transmission member (44), the water pump (42) is fixedly connected to the inner wall of the oil chamber (411), and the rotating column (422) is connected to the gear set (2) through the transmission member (44).

5. The cast iron gearbox according to claim 4, characterized in that: The gear set (2) comprises an input shaft (21), an output shaft (22), a fixing column (23), an input gear (24), an output gear (25), a first bearing (26) and a transition gear (27). The outer wall of the housing (1) is provided with an input port (12) and an output port (13). Both the input port (12) and the output port (13) are connected to the accommodating chamber (11). The input shaft (21) is coaxially rotatably connected to the inner wall of the input port (12). The output shaft (22) is coaxially rotatably connected to the inner wall of the output port (13). The fixing column (23) is provided between the input shaft (21) and the output shaft (22). The fixing column (23) is fixedly connected to the inner wall of the accommodating chamber (11). The axis of the input port (12) The axis of the output port (13) and the axis of the fixed column (23) are parallel to each other. The input gear (24), the output gear (25) and the transition gear (27) are all arranged in the accommodating chamber (11). The input gear (24) is coaxially fixedly connected to the outer wall of the input shaft (21). The output gear (25) is coaxially fixedly connected to the outer wall of the output shaft (22). The first bearing (26) is coaxially fixedly connected to the outer wall of the fixed column (23). The transition gear (27) is coaxially fixedly connected to the outer wall of the first bearing (26). The two ends of the transition gear (27) are respectively engaged with the input gear (24) and the output gear (25). The rotating column (422) is engaged with the input gear (24) through the transmission member (44).

6. The cast iron gearbox according to claim 5, characterized in that: The transmission member (44) includes a support column (441) and a control gear (442). The support column (441) is provided on a side of the input gear (24) away from the transition gear (27). The axis of the support column (441) is parallel to the axis of the input shaft (21). The support column (441) is connected to the inner wall of the accommodating cavity (11) by rotating around its own axis. The control gear (442) is coaxially fixedly connected to the outer wall of the support column (441). The control gear (442) is engaged with the input gear (24). One end of the support column (441) extends into the oil cavity (411), and one end of the rotating column (422) extends out of the pump cavity (4211). The support column (441) is coaxially fixedly connected to the rotating column (422).

7. The cast iron gearbox according to claim 6, characterized in that: The impeller comprises a fixing ring (4231), blades (4232) and a first heat-expanding block (4233); the fixing ring (4231) is coaxially fixedly connected to the outer wall of the rotating column (422); the blades (4232) are fixedly connected to the fixing ring (4231); a plurality of blades (4232) are provided, and the plurality of blades (4232) are evenly spaced around the axis of the fixing ring (4231); and the first heat-expanding block (4233) is fixedly connected to one end of the blade (4232) away from the fixing ring (4231).

8. The cast iron gearbox according to claim 5, characterized in that: The invention also includes a connecting pipe (45), wherein the upper end of the box body (1) is provided with an exhaust port (15), the outer wall of the box body (1) is provided with a communication port (16), the exhaust port (15) and the communication port (16) are both connected to the accommodating cavity (11), the connecting pipe (45) is provided on the outer periphery of the box body (1), one end of the connecting pipe (45) is coaxially fixedly connected to the inner wall of the exhaust port (15), the connecting pipe (45) is coaxially fixedly connected to the inner wall of the communication port (16), the connecting pipe (45) is connected to the accommodating cavity (11), and the end of the connecting pipe (45) away from the exhaust port (15) opens toward the first bearing (26).

9. The cast iron gearbox according to claim 8, characterized in that: It also includes a vent plug (46), the outer wall of the connecting pipe (45) is provided with a vent opening (4511), and the vent plug (46) is fixedly connected to the inner wall of the vent opening (4511).

10. The cast iron gearbox according to claim 1, characterized in that: The device further comprises a second heat-expanding block (33) and a heat-insulating plate (34), one end of the second heat-expanding block (33) being fixedly connected to the inner wall of the nozzle (321), and the other end of the second heat-expanding block (33) being fixedly connected to the heat-insulating plate (34), and the second heat-expanding block (33) being used to change the size of the nozzle (321).

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