Protector for tilting hydraulic cylinder of a casting machine

Abstract

The utility model relates to a protection device of tilting hydraulic cylinder of cast -iron machine belongs to hydraulic cylinder protection technical field. Including the axle stem and multiple groups of sector plate for protecting tilting hydraulic cylinder fixedly connected in the inner side wall of tilting support, the center of each group of sector plate is fixedly connected with the ear seat, and multiple ear seats are coaxially rotatable and are axially fixed through the fixing piece outside the axle stem, the innermost sector plate is connected with the inner wall of tilting support through the first limiting part, and the outermost sector plate is connected with the tilting machine stand through the second limiting part. The utility model discloses through setting multiple sector plates, when tilting hydraulic cylinder drives tilting support movement, multiple sector plates can rotate and unfold in turn, thereby form a continuous barrier, thereby avoid the high temperature molten iron spatter to the protection cover outside tilting hydraulic cylinder, reduced the replacement frequency of protection cover, and effectively protected to tilting hydraulic cylinder.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder protection technology, and in particular to a protective device for the tilting hydraulic cylinder of a cast iron machine. Background Technology

[0002] In the cast iron production process, the cast iron casting machine uses a tilting machine to tilt the molten iron ladle for pouring, ensuring that the molten iron can flow smoothly into the mold for casting. Specifically, the top of the tilting machine column is connected to the tilting support by a hinge. During the tilting process, the tilting hydraulic cylinder can drive the tilting support and the molten iron ladle placed inside it to rotate around the hinge point of the tilting machine column, thereby realizing the cast iron pouring function of the cast iron casting machine.

[0003] However, due to the significant distance between the molten iron flow channel and the ladle opening of the casting machine, molten iron is highly susceptible to splashing during the tilting casting process. To protect the tilting hydraulic cylinder from damage caused by molten iron splashing, a protective cover is usually installed on its exterior.

[0004] However, in actual operation, the splashed high-temperature molten iron can easily ignite the protective cover itself or the oil stains adhering to its surface, causing the protective cover to catch fire and requiring frequent replacement. Secondly, when the protective cover is damaged, the high temperature and flames of the molten iron can directly burn or scratch the surface of the hydraulic cylinder piston rod, leading to hydraulic cylinder seal failure, leakage, or even complete damage. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this utility model provides a protective device for the tilting hydraulic cylinder of a cast iron machine. The technical solution of this utility model is as follows: The protective device for the tilting hydraulic cylinder of the cast iron machine includes a shaft fixedly connected to the inner wall of the tilting bracket and multiple sets of sector plates for protecting the tilting hydraulic cylinder. Each set of sector plates has an ear seat fixedly connected to its center. The multiple sets of ear seats are sequentially and coaxially rotated on the outside of the shaft and axially fixed by a fixing member. The innermost sector plate is connected to the inner wall of the tilting bracket through a first limiting member, and the outermost sector plate is connected to the tilting machine column through a second limiting member. When the tilting hydraulic cylinder drives the tilting bracket to tilt relative to the tilting machine column, multiple sets of the sector plates can rotate and unfold sequentially relative to the shaft as the tilting bracket moves, and the sides of two adjacent sets of sector plates overlap each other to form a continuous barrier.

[0006] Optionally, the outer part of the shaft is divided into an installation section for fitting the lug and a fixing section for installing the fastener, and the installation section is fixedly connected to the inner wall of the tilting bracket.

[0007] Optionally, the sector plate includes a main plate and a back plate, the main plate and the back plate are fixedly connected by multiple sets of reinforcing ribs, and the back plate is located on the side close to the tilting hydraulic cylinder.

[0008] Optionally, a protective baffle is fixedly connected to the side wall of the fan-shaped plate near the tilting machine column, and the protective baffle extends and protrudes in the direction of the back plate. A limit baffle is fixedly connected to the side wall of the fan-shaped plate near the tilting bracket, and the limit baffle extends and protrudes in the direction of the main board. When multiple sets of the sector plates are unfolded in sequence, the protective baffle of one of the adjacent sets of sector plates overlaps or abuts against the limiting baffle of the other, forming a continuous barrier together.

[0009] Optionally, the surface of the ear seat is provided with a circular hole, and a fixing ring is rotatably connected inside the circular hole through a bearing. The fixing ring is slidably sleeved on the outside of the mounting section of the shaft. The axial length of the fixing ring is greater than the overall thickness of the sector plate. One or more limiting grooves are provided on the inner sidewall of the fixing ring along the axial direction. Limiting ribs that match the number and shape of the limiting grooves are fixedly connected to the outer peripheral wall of the mounting section of the shaft.

[0010] Optionally, the fastener includes at least one limiting ring and a fixing nut. The limiting ring is sleeved on the outside of the mounting section of the shaft and abuts against the outside of the outermost lug. The fixing nut is threaded on the outside of the fixing section of the shaft and abuts against the limiting ring.

[0011] Optionally, the inner wall of the tilting bracket is also connected to an auxiliary support member for providing auxiliary support to the cantilever end of the shaft.

[0012] Optionally, the auxiliary support includes a support rod and a receiving plate. The support rod is arranged parallel above the shaft and is fixedly connected to the inner wall of the tilting bracket. The receiving plate has a movable hole and a hanging groove. The receiving plate is movably sleeved on the end of the support rod through the movable hole. The fixed end of the shaft passes through the hanging groove of the receiving plate. Two sets of locking nuts for locking the position of the receiving plate are also threaded on the outer side of the end of the support rod.

[0013] Optionally, the first limiting member includes a fixing lug and a nut seat. The fixing lug is fixedly connected to the outer peripheral sidewall of the innermost sector plate, and the nut seat is fixedly connected to the inner sidewall of the tilting bracket. A bolt is threaded onto the fixing lug, and the end of the bolt is threadedly connected to the nut seat.

[0014] Optionally, the second limiting component includes a fixed plate and a guide rail. The fixed plate is fixedly connected to the back side of the outermost sector plate. A fixed lug is fixedly connected to the fixed plate. A connecting block is rotatably connected to the fixed lug via a pin. A movable lug is rotatably connected to the end of the connecting block away from the fixed lug via a pin. The guide rail is vertically fixedly connected to the side wall of the tilting machine column. The movable lug slides vertically inside the guide rail.

[0015] All of the above optional technical solutions can be combined arbitrarily, and this utility model does not provide a detailed description of the structure after each combination.

[0016] The beneficial effects of this utility model through the above solution are as follows: 1. This utility model, by setting multiple sets of sector plates, allows the sector plates to rotate and unfold sequentially when the tilting hydraulic cylinder drives the tilting support to move, thereby forming a continuous barrier. This prevents the splashed high-temperature molten iron from splashing onto the protective cover outside the tilting hydraulic cylinder, reducing the frequency of replacement of the protective cover and effectively protecting the tilting hydraulic cylinder.

[0017] 2. By setting the shaft and ear seat, the sector plate is sleeved on the outside of the shaft through the ear seat. In practical applications, an appropriate number of sector plates can be installed according to the actual tilting angle of the tilting bracket, which enhances its applicability and facilitates the replacement of individual sector plates in the future.

[0018] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall appearance structure of the fan-shaped plate in the folded state in this utility model; Figure 2 This is a schematic diagram of the overall appearance structure of the sector-shaped plate in the unfolded state in this utility model; Figure 3 for Figure 1 Front sectional view; Figure 4 This is a schematic diagram showing the disassembled structure of the tilting bracket, shaft, sector plate, ear seat, fixing component, auxiliary support component, first limiting component, and second limiting component in this utility model. Figure 5 This is a top sectional view of the sector-shaped plate in this utility model; Figure 6 This is a schematic diagram of the structure of the outermost sector plate and the second limiting member in this utility model. Figure 7This is a schematic diagram of the structure of the innermost sector plate and the first limiting member in this utility model. Figure 8 This is an exploded structural diagram of the sector plate and ear seat in this utility model; Figure 9 This is a cross-sectional view of the central shaft, lug, fixing component, and auxiliary support component of this utility model. Figure 10 This is an exploded structural diagram of the central shaft, lug, fixing component, and auxiliary support component of this utility model.

[0020] The diagram labels are as follows: 1. Tilting bracket; 2. Tilting machine column; 3. Shaft; 31. Installation section; 311. Limiting rib; 32. Fixing section; 4. Sector plate; 41. Main board; 42. Back plate; 43. Reinforcing rib; 44. Protective strip; 45. Limiting strip; 5. Ear seat; 51. Round hole; 52. Bearing; 53. Fixing ring; 531. Limiting groove; 6. Fixing component; 61. Limiting ring; 62. Fixing nut; 7. Auxiliary support component; 71. Support rod; 72. Receiving plate; 721. Movable hole; 722. Hanging groove; 73. Locking nut; 8. First limiting component; 81. Fixing ear; 82. Bolt; 83. Nut seat; 9. Second limiting component; 91. Fixing plate; 92. Fixing ear seat; 93. Connecting block; 94. Movable ear seat; 95. Guide rail. Detailed Implementation

[0021] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0022] Please see Figure 1-10 This utility model provides a protective device for the tilting hydraulic cylinder of a cast iron machine, including a shaft 3 fixedly connected to the inner wall of the tilting bracket 1 and multiple sets of sector plates 4 for protecting the tilting hydraulic cylinder. Each set of sector plates 4 has an ear seat 5 fixedly connected to its center. Multiple sets of ear seats 5 are sequentially and coaxially rotated on the outside of the shaft 3 and are axially fixed by a fixing member 6. The innermost sector plate 4 is connected to the inner wall of the tilting bracket 1 through a first limiting member 8, and the outermost sector plate 4 is connected to the tilting machine column 2 through a second limiting member 9. When the tilting hydraulic cylinder drives the tilting support 1 to tilt relative to the tilting machine column 2, multiple sets of sector plates 4 can rotate and unfold sequentially relative to the shaft 3 as the tilting support 1 moves, and the sides of two adjacent sets of sector plates 4 overlap each other to form a continuous barrier.

[0023] In this invention, the tilting hydraulic cylinder drives the tilting support 1 to tilt. At this time, the tilting support 1 pulls the innermost sector plate 4 to rotate synchronously via the first limiting member 8. The other sector plates 4 then rotate and unfold sequentially. During the unfolding process, the sides of adjacent sets of sector plates 4 overlap, forming a continuous barrier. This effectively prevents molten iron from splashing onto the tilting hydraulic cylinder and its outer protective cover, providing effective isolation and protection, reducing the frequency of cover replacement and the risk of damage to the hydraulic rod. Secondly, by setting the second limiting member 9, as the sector plates 4 rotate and unfold sequentially, the outermost sector plate 4 remains connected to the tilting machine column 2 under the action of the second limiting member 9. This ensures that the tilting area between the tilting support 1 and the tilting machine column 2 forms a continuous barrier under the obstruction of multiple sets of sector plates 4.

[0024] By setting up the shaft 3 and the lug 5, the sector plate 4 is sleeved on the outside of the shaft 3 through the lug 5. In practical applications, the appropriate number of sector plates 4 can be adjusted and installed according to the actual tilting angle of the tilting bracket 1, thus enhancing its applicability. At the same time, since the sector plate 4 is sleeved on the outside of the shaft 3 through the lug 5, when it is necessary to replace a single sector plate 4, it is only necessary to remove the fixing part 6 at the end of the shaft 3 to easily remove the lug 5 from the shaft 3, thereby simplifying the maintenance operation.

[0025] It should be noted that the "innermost fan-shaped plate 4" mentioned in this article refers to a group of fan-shaped plates 4 near the splashing of molten iron, while the "outermost fan-shaped plate 4" refers to a group of fan-shaped plates 4 near the tilting hydraulic cylinder.

[0026] Furthermore, the outer part of the shaft 3 is divided into an installation section 31 for mounting the lug 5 and a fixing section 32 for mounting the fastener 6. The installation section 31 is fixedly connected to the inner wall of the tilting bracket 1.

[0027] Furthermore, the sector plate 4 includes a main plate 41 and a back plate 42. The main plate 41 and the back plate 42 are fixedly connected by multiple sets of reinforcing ribs 43. The back plate 42 is located on the side close to the tilting hydraulic cylinder.

[0028] Specifically, the sector plate 4 adopts a three-layer structure to ensure its own strength and prevent deformation due to high temperature or impact. The main plate 41 facing the side where molten iron splashes can be made of thicker high-temperature resistant steel plate, such as 310S heat-resistant steel. The reinforcing ribs 43 can be made of flat steel to prevent deformation of the sector plate 4.

[0029] Furthermore, a protective baffle 44 is fixedly connected to the side wall of the fan-shaped plate 4 near the tilting machine column 2. The protective baffle 44 extends and protrudes in the direction of the back plate 42. A limit baffle 45 is fixedly connected to the side wall of the fan-shaped plate 4 near the tilting bracket 1. The limit baffle 45 extends and protrudes in the direction of the main board 41. When multiple sets of sector plates 4 are unfolded in sequence, the protective baffle 44 of one of the adjacent two sets of sector plates 4 overlaps or abuts with the limiting baffle 45 of the other, forming a continuous barrier together.

[0030] Specifically, by setting the protective baffle 44 and the limiting baffle 45, not only can the two adjacent sets of sector plates 4 be limited, but the sealing of the two in the deployed state can also be ensured. When the sector plate 4 is deployed, the protective baffle 44 and the limiting baffle 45 abut against each other, thereby sealing the gap between the two adjacent sets of sector plates 4 and preventing splashed molten iron from entering through the gap between the two sets of sector plates 4. Secondly, when the protective baffle 44 of one of the two adjacent sets of sector plates 4 overlaps or abuts against the limiting baffle 45 of the other, it indicates that the two sets of sector plates 4 have been deployed in place. As the tilting bracket 1 continues to rotate, it will drive the third set of sector plates 4 to deploy. In addition, by setting the protective baffle 44 and the limiting baffle 45, sufficient rotational clearance can also be maintained between the two adjacent sets of sector plates 4 to prevent them from being too tightly fitted, which would affect their rotation and deployment.

[0031] Furthermore, a circular hole 51 is provided on the surface of the ear seat 5. A fixing ring 53 is rotatably connected inside the circular hole 51 through a bearing 52. The fixing ring 53 is slidably sleeved on the outside of the mounting section 31 of the shaft 3. The axial length of the fixing ring 53 is greater than the overall thickness of the fan-shaped plate 4. One or more limiting grooves 531 are provided on the inner sidewall of the fixing ring 53 along the axial direction. Limiting ribs 311 that are adapted to the number and shape of the limiting grooves 531 are fixedly connected to the outer peripheral wall of the mounting section 31 of the shaft 3.

[0032] Specifically, the lug 5 is connected to the retaining ring 53 via the bearing 52, which makes the rotation of the sector plate 4 very smooth with low resistance, avoiding potential jamming during long-term use. Secondly, the retaining ring 53 cooperates with the retaining rib 311 on the shaft 3 via the limiting groove 531, ensuring that the retaining ring 53 is relatively fixed after being fitted onto the outside of the shaft 3. Furthermore, it facilitates quick and easy positioning when subsequently fitting the retaining ring 53 onto the outside of the shaft 3. In addition, the axial length of the retaining ring 53 is greater than the overall thickness of the sector plate 4, providing sufficient rotational space for the two sets of sector plates 4 and the lug 5, preventing mutual friction between the two sets of sector plates 4 during rotation.

[0033] Furthermore, the fastener 6 includes at least one limiting ring 61 and a fixing nut 62. The limiting ring 61 is sleeved on the outside of the mounting section 31 of the shaft 3 and abuts against the outside of the outermost lug 5. The fixing nut 62 is threaded on the outside of the fixing section 32 of the shaft 3 and abuts against the limiting ring 61.

[0034] Specifically, the limiting ring 61 has the same structure as the fixing ring 53, but its axial length is shorter than that of the fixing ring 53. After the sector plate 4 is installed, a suitable number of limiting rings 61 are fitted onto the outer side of the remaining mounting section 31 of the shaft 3, and then the fixing nut 62 is screwed onto the outer side of the limiting ring 61. At this time, under the axial clamping force of the fixing nut 62, multiple sets of lugs 5 are fixed. By unscrewing the fixing nut 62, the sector plate 4 and lugs 5 can be easily disassembled, facilitating later maintenance.

[0035] Furthermore, the inner wall of the tilting bracket 1 is also connected to an auxiliary support member 7 for providing auxiliary support to the cantilever end of the shaft 3. Since the lug 5 needs to be inserted into the shaft 3 from one end, the end of the shaft 3 away from the tilting bracket 1 is open. In order to avoid deformation or instability of its open end (cantilever end) due to external forces, the auxiliary support member 7 is specially provided to enhance the support force and stability of the cantilever end of the shaft 3.

[0036] Furthermore, the auxiliary support 7 includes a support rod 71 and a receiving plate 72. The support rod 71 is arranged parallel above the shaft 3 and is fixedly connected to the inner wall of the tilting bracket 1. The receiving plate 72 has a movable hole 721 and a hanging groove 722. The receiving plate 72 is movably sleeved on the end of the support rod 71 through the movable hole 721. The end of the fixed section 32 of the shaft 3 passes through the hanging groove 722 of the receiving plate 72. Two sets of locking nuts 73 are also threaded on the outer side of the end of the support rod 71 to lock the position of the receiving plate 72.

[0037] Specifically, after the sector plate 4 is installed, the receiving plate 72 is fitted onto the end of the support rod 71 through the movable hole 721. Then, the hanging groove 722 of the receiving plate 72 is simultaneously inserted into the fixed section 32 of the shaft 3. At this time, under the combined action of the receiving plate 72 and the support rod 71, the cantilever end of the shaft 3 can be provided with auxiliary support. In addition, in order to further enhance the structural stability of the support rod 71, in addition to fixing one end of the support rod 71 to the tilting bracket 1, a support (not shown in the figure) can be welded to the end of the support rod 71 at a position that does not affect the installation of the receiving plate 72.

[0038] Furthermore, the first limiting member 8 includes a fixing ear 81 and a nut seat 83. The fixing ear 81 is fixedly connected to the outer peripheral side wall of the innermost sector plate 4, and the nut seat 83 is fixedly connected to the inner side wall of the tilting bracket 1. A bolt 82 is threadedly connected to the fixing ear 81, and the end of the bolt 82 is threadedly connected to the nut seat 83.

[0039] Specifically, the function of the first limiting member 8 is to fix the innermost sector plate 4 to the tilting bracket 1, so that when the tilting bracket 1 rotates, it can drive the innermost sector plate 4 to start rotating.

[0040] Furthermore, the second limiting member 9 includes a fixed plate 91 and a guide rail 95. The fixed plate 91 is fixedly connected to the back side of the outermost sector plate 4. A fixed ear seat 92 is fixedly connected to the fixed plate 91. A connecting block 93 is rotatably connected to the fixed ear seat 92 via a pin. A movable ear seat 94 is rotatably connected to the end of the connecting block 93 away from the fixed ear seat 92 via a pin. The guide rail 95 is vertically fixedly connected to the side wall of the tilting machine column 2. The movable ear seat 94 slides vertically inside the guide rail 95.

[0041] Specifically, the function of the second limiting member 9 is to fix the outermost sector plate 4 to the tilting machine column 2, ensuring that the rotation area between the tilting bracket 1 and the tilting machine column 2 is always blocked by the sector plate 4. Furthermore, as the tilting bracket 1 rotates, multiple sets of sector plates 4 rotate and unfold sequentially. At this time, the outermost sector plate 4 will also indirectly drive the movable lug 94 to slide upward relative to the guide rail 95 of the tilting machine column 2, thereby ensuring the smooth movement of the tilting bracket 1 and the smooth unfolding of the sector plates 4.

[0042] The above are merely preferred embodiments of this utility model and are not intended to limit this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A protective device for the tilting hydraulic cylinder of a cast iron machine, characterized in that: It includes a shaft (3) fixedly connected to the inner wall of the tilting bracket (1) and multiple sets of sector plates (4) used to protect the tilting hydraulic cylinder. Each set of sector plates (4) is fixedly connected to an ear seat (5). Multiple sets of ear seats (5) are sequentially and coaxially rotated on the outside of the shaft (3) and axially fixed by a fastener (6). The innermost sector plate (4) is connected to the inner wall of the tilting bracket (1) through a first limiting member (8), and the outermost sector plate (4) is connected to the tilting machine column (2) through a second limiting member (9). When the tilting hydraulic cylinder drives the tilting support (1) to tilt relative to the tilting machine column (2), multiple sets of the sector plates (4) can rotate and unfold in sequence relative to the shaft (3) as the tilting support (1) moves, and the sides of two adjacent sets of sector plates (4) overlap each other to form a continuous barrier.

2. The protective device for the tilting hydraulic cylinder of the cast iron machine according to claim 1, characterized in that, The outer part of the shaft (3) is divided into an installation section (31) for fitting the lug (5) and a fixing section (32) for installing the fastener (6). The installation section (31) is fixedly connected to the inner wall of the tilting bracket (1).

3. The protective device for the tilting hydraulic cylinder of the cast iron machine according to claim 1, characterized in that, The sector plate (4) includes a main plate (41) and a back plate (42). The main plate (41) and the back plate (42) are fixedly connected by multiple sets of reinforcing ribs (43). The back plate (42) is located on the side close to the tilting hydraulic cylinder.

4. The protective device for the tilting hydraulic cylinder of the cast iron machine according to claim 3, characterized in that, A protective baffle (44) is fixedly connected to the side wall of the fan-shaped plate (4) near the tilting machine column (2). The protective baffle (44) extends and protrudes in the direction of the back plate (42). A limit baffle (45) is fixedly connected to the side wall of the fan-shaped plate (4) near the tilting bracket (1). The limit baffle (45) extends and protrudes in the direction of the main board (41). When multiple sets of the sector plates (4) are unfolded in sequence, the protective baffle (44) of one of the adjacent two sets of sector plates (4) and the limiting baffle (45) of the other overlap or abut against each other to form a continuous barrier.

5. The protective device for the tilting hydraulic cylinder of the cast iron machine according to claim 2, characterized in that, The surface of the ear seat (5) is provided with a circular hole (51). The inside of the circular hole (51) is rotatably connected to a fixing ring (53) through a bearing (52). The fixing ring (53) is slidably sleeved on the outside of the mounting section (31) of the shaft (3). The axial length of the fixing ring (53) is greater than the overall thickness of the fan-shaped plate (4). The inner sidewall of the fixing ring (53) is provided with one or more limiting grooves (531) along the axial direction. The outer peripheral wall of the mounting section (31) of the shaft (3) is fixedly connected with limiting ribs (311) that are adapted to the number and shape of the limiting grooves (531).

6. The protective device for the tilting hydraulic cylinder of the cast iron machine according to claim 5, characterized in that, The fastener (6) includes at least one limiting ring (61) and a fixing nut (62). The limiting ring (61) is sleeved on the outside of the mounting section (31) of the shaft (3) and abuts against the outside of the outermost lug (5). The fixing nut (62) is threaded on the outside of the fixing section (32) of the shaft (3) and abuts against the limiting ring (61).

7. The protective device for the tilting hydraulic cylinder of the cast iron machine according to claim 1, characterized in that, The inner wall of the tilting bracket (1) is also connected to an auxiliary support member (7) for providing auxiliary support to the cantilever end of the shaft (3).

8. The protective device for the tilting hydraulic cylinder of the cast iron machine according to claim 7, characterized in that, The auxiliary support (7) includes a support rod (71) and a receiving plate (72). The support rod (71) is arranged parallel above the shaft (3) and is fixedly connected to the inner wall of the tilting bracket (1). The receiving plate (72) has a movable hole (721) and a hanging groove (722). The receiving plate (72) is movably sleeved on the end of the support rod (71) through the movable hole (721). The end of the fixed section (32) of the shaft (3) passes through the hanging groove (722) of the receiving plate (72). Two sets of locking nuts (73) for locking the position of the receiving plate (72) are also threaded on the outer side of the end of the support rod (71).

9. The protective device for the tilting hydraulic cylinder of the cast iron machine according to claim 1, characterized in that, The first limiting member (8) includes a fixing ear (81) and a nut seat (83). The fixing ear (81) is fixedly connected to the outer peripheral side wall of the innermost sector plate (4). The nut seat (83) is fixedly connected to the inner side wall of the tilting bracket (1). A bolt (82) is threadedly connected to the fixing ear (81). The end of the bolt (82) is threadedly connected to the nut seat (83).

10. The protective device for the tilting hydraulic cylinder of the cast iron machine according to claim 1, characterized in that, The second limiting member (9) includes a fixed plate (91) and a guide rail (95). The fixed plate (91) is fixedly connected to the back side of the outermost sector plate (4). A fixed ear seat (92) is fixedly connected to the fixed plate (91). A connecting block (93) is rotatably connected to the fixed ear seat (92) via a pin. A movable ear seat (94) is rotatably connected to the end of the connecting block (93) away from the fixed ear seat (92) via a pin. The guide rail (95) is vertically fixedly connected to the side wall of the tilting machine column (2). The movable ear seat (94) slides vertically inside the guide rail (95).

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