Shield tunneling machine lifting oil cylinder

Abstract

The utility model relates to the technical field of oil cylinder manufacturing, in particular to a lifting oil cylinder of a shield tunneling machine. A lifting oil cylinder of a shield tunneling machine comprises a cylinder barrel, a first piston rod, a first guide sleeve, a spacer bush assembly, a piston, a second piston rod, a second guide sleeve and a gland, and the spacer bush assembly is arranged between the inner wall of the cylinder barrel and the outer wall of the first piston rod and comprises a first copper bush, a spacer bush and a second copper bush which are sequentially arranged in the direction from the first guide sleeve to the gland. The inner wall of the first copper sleeve and the inner wall of the second copper sleeve are each sprayed with a polytetrafluoroethylene coating containing molybdenum disulfide, and the inner wall of the first copper sleeve and the inner wall of the second copper sleeve are each provided with a one-way spiral groove. Teflon coatings containing molybdenum disulfide are sprayed on the inner walls of the first copper sleeve and the second copper sleeve of the spacer bush assembly, a lower friction coefficient is achieved, molybdenum disulfide has excellent lubricating performance, and a lubricating film is not prone to being extruded out of the friction surface when bearing loads. Therefore, when the oil cylinder bears variable side loads, the problem of crawling shaking can be well solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinder manufacturing, in particular to a shield machine lifting oil cylinder. Background Art

[0002] The shield machine lifting cylinder is a hydraulic component used in shield machines (tunnel boring machines). Its primary function is to provide force through the hydraulic system to lift and adjust the various components of the shield machine, such as the cutterhead, machine body, and propulsion system. Specifically, the lifting cylinder's main functions include: supporting the machine body during construction, ensuring stable operation in the tunnel; the shield machine's posture must be constantly adjusted to adapt to varying geological conditions; the ability to quickly change the height and angle of the machine body through hydraulic drive to ensure construction accuracy; and the powerful thrust generated by the hydraulic system to help the shield machine reach its target position.

[0003] Because the shield machine's lifting cylinders are subject to significant lateral forces during operation, and this lateral force constantly changes as the cylinders expand and contract, it can easily cause the cylinders to vibrate. Furthermore, the friction coefficient of the guides on typical lifting cylinders currently on the market is relatively high, which can also cause the cylinders to creep and vibrate. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problems existing in the prior art in the above background technology, a shield machine lifting cylinder is provided.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a shield machine lifting cylinder, including a cylinder, a first piston rod, a first guide sleeve, a spacer assembly, a piston, a second piston rod, a second guide sleeve and a gland,

[0006] The spacer sleeve assembly is arranged between the inner wall of the cylinder and the outer wall of the first piston rod, and includes a first copper sleeve, a spacer sleeve and a second copper sleeve arranged in sequence from the first guide sleeve to the pressure cover, and a unidirectional spiral groove is provided on the inner wall of the first copper sleeve and the second copper sleeve.

[0007] Furthermore, inner walls of the first copper sleeve and the second copper sleeve are sprayed with a polytetrafluoroethylene coating containing molybdenum disulfide.

[0008] Furthermore, a grid ring is provided on the inner wall of the end of the first guide sleeve away from the first copper sleeve, and a grid ring is also provided on the inner wall of the end of the second copper sleeve away from the spacer sleeve.

[0009] Furthermore, a dust ring is provided on the outer side of the grid ring on the first guide sleeve.

[0010] Furthermore, an O-ring is provided on the outer wall of the end of the first guide sleeve away from the first copper sleeve, and an O-ring is also provided on the outer wall of the end of the second copper sleeve away from the spacer sleeve.

[0011] Furthermore, an annular groove is provided on the outer periphery of the spacer.

[0012] Furthermore, an upper oil drain cup and a lower oil drain cup are symmetrically arranged on the outer wall of the cylinder, and the upper oil drain cup and the lower oil drain cup are distributed corresponding to the first guide sleeve, the first copper sleeve, the spacer sleeve and the second copper sleeve.

[0013] Furthermore, the upper oil cup is an oil filling cup, and the lower oil cup is a pressure relief cup.

[0014] Furthermore, the two sides of the piston in the cylinder are respectively a rodless cavity and a rod cavity, and the second piston rod is respectively provided with a first oil channel communicating with the rodless cavity and a second oil channel communicating with the rod cavity.

[0015] Furthermore, the outer end of the second piston rod passes through a pressure cover, and a tightening nut for locking the pressure cover is provided on the outer side of the pressure cover; a first oil port and a second oil port are provided on the outer wall near the end of the second piston rod, the first oil port is connected to the first oil channel, and the second oil port is connected to the second oil channel.

[0016] Furthermore, both the first oil port and the second oil port are provided with oil port covers.

[0017] Beneficial effects of the utility model:

[0018] The utility model provides a spacer assembly including a first copper sleeve, a spacer, and a second copper sleeve, which form a guide structure with the first guide sleeve, and the two ends of the guide structure are sealed by a grid ring and an O-ring; a unidirectional spiral groove is provided on the inner wall of the first and second copper sleeves, and a groove is provided on the outer periphery of the spacer to store lubricating grease; an upper oil drain cup and a lower oil drain cup are symmetrically provided on the outer wall of the cylinder barrel, and lubricating grease is injected through the upper oil drain cup, and the lubricating grease passes through the first guide sleeve, the first copper sleeve, the spacer, and the second copper sleeve in sequence, and is finally discharged from the lower oil drain cup, thereby ensuring that the entire guide structure is fully lubricated;

[0019] The inner walls of the first and second copper sleeves are sprayed with a polytetrafluoroethylene coating containing molybdenum disulfide. Compared with ordinary copper sleeves, these have a lower friction coefficient. Molybdenum disulfide also has excellent lubrication properties and is less likely to be squeezed out of the friction surface when the lubricating film is under load. Therefore, when the lifting cylinder is carrying a changing side load, the creeping and shaking problem can be effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 It is a structural diagram of the present utility model.

[0022] Figure 2 yes Figure 1 Cross-sectional view in the AA direction.

[0023] Figure 3 yes Figure 1 View in direction B.

[0024] Figure 4 yes Figure 3 Partial cross-section in the CC direction.

[0025] Figure 5 It is a cross-sectional view of the first copper sleeve in the utility model.

[0026] Figure 6 It is a structural schematic diagram of the middle spacer sleeve of the utility model.

[0027] In the figure: 1. Cylinder; 2. First piston rod; 3. First guide sleeve; 4. Spacer assembly; 41. First copper sleeve; 410. Spiral groove; 42. Spacer; 421. Annular groove; 43. Second copper sleeve; 44. Gly ring; 45. Dust ring; 46. O-ring; 5. Piston; 6. Second piston rod; 60. Oil port cover; 61. First oil port; 62. Second oil port; 63. First oil channel; 64. Second oil channel; 7. Second guide sleeve; 8. Pressure cap; 9. Tightening nut; 10. Rodless chamber; 11. Rod chamber; 12. Upper drain cup; 13. Lower drain cup. DETAILED DESCRIPTION

[0028] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0029] like Figures 1 to 3 As shown, a shield machine lifting cylinder includes a cylinder barrel 1, a first piston rod 2, a first guide sleeve 3, a spacer sleeve assembly 4, a piston 5, a second piston rod 6, a second guide sleeve 7 and a gland 8. The outer end of the second piston rod 6 passes through the gland 8. A tightening nut 9 for locking the gland 8 is provided on the outer side of the gland 8. A first oil port 61 and a second oil port 62 are provided on the outer wall near the end of the second piston rod 6. An oil port cover plate 60 is provided on both the first oil port 61 and the second oil port 62. On both sides of the piston 5 in the cylinder barrel 1 are a rodless chamber 10 and a rod chamber 11, respectively. A first oil channel 63 communicating with the rodless chamber 10 and a second oil channel 64 communicating with the rod chamber 11 are provided in the second piston rod 6. The first oil port 61 is connected to the first oil channel 63, and the second oil port 62 is connected to the second oil channel 64.

[0030] When the hydraulic oil enters from the first oil port 61 of the oil port cover plate 60 and enters the rodless chamber 10 through the first oil channel 63, the first piston rod 2 extends; when the hydraulic oil enters from the second oil port 62 of the oil port cover plate 60 and enters the rod chamber 11 through the second oil channel 64, the first piston rod 2 retracts. During the whole process, the spacer sleeve assembly 4 plays a guiding role.

[0031] like Figure 2 As shown, the spacer assembly 4 is positioned between the inner wall of the cylinder barrel 1 and the outer wall of the first piston rod 2. Specifically, the spacer assembly 4 comprises a first copper sleeve 41, a spacer sleeve 42, and a second copper sleeve 43, arranged sequentially from the first guide sleeve 3 toward the gland 8. The inner walls of the first and second copper sleeves 42, 43 are sprayed with a polytetrafluoroethylene coating containing molybdenum disulfide. The polytetrafluoroethylene coating is corrosion-resistant and high-temperature resistant, has an extremely low coefficient of friction, and provides excellent lubrication. Molybdenum disulfide possesses excellent lubrication properties, resulting in an even lower coefficient of friction for the copper sleeves, making them less likely to be squeezed out of the friction surface when the lubricating film is under load. Therefore, when the lift cylinder is subjected to varying side loads, creep and shudder are less likely to occur.

[0032] like Figure 1 and Figure 4 As shown, an upper oil drain cup 12 and a lower oil drain cup 13 are symmetrically arranged on the outer wall of the cylinder 1. The upper oil drain cup 12 and the lower oil drain cup 13 are distributed corresponding to the first guide sleeve 3, the first copper sleeve 41, the spacer sleeve 42 and the second copper sleeve 43. The upper oil drain cup 12 is an oil filling cup, and the lower oil drain cup 13 is a pressure relief cup.

[0033] like Figure 5 As shown, a unidirectional spiral groove 410 is provided on the inner wall of the first copper sleeve 41 to make the lubricating grease more evenly distributed. The structure of the second copper sleeve 42 is the same as that of the first copper sleeve 41; Figure 6 As shown, an annular groove 421 is provided on the outer periphery of the spacer 42 for storing lubricating grease.

[0034] Combine Figure 2 A grid ring 44 is provided on the inner wall of the end of the first guide sleeve 3 away from the first copper sleeve 41. A grid ring 44 is also provided on the inner wall of the end of the second copper sleeve 43 away from the spacer 42. A dust ring 45 is provided on the outer side of the grid ring 44 of the first guide sleeve 3. An O-ring 46 is provided on the outer wall of the end of the first guide sleeve 3 away from the first copper sleeve 41. An O-ring 46 is also provided on the outer wall of the end of the second copper sleeve 43 away from the spacer 42.

[0035] When grease is injected into the upper drain cup 12, it passes through the first guide sleeve 3, the first copper sleeve 41, the spacer sleeve 42, and the second copper sleeve 43 in sequence. The grease passes through the first guide sleeve 3 and reaches the first copper sleeve 41, then moves along the unidirectional spiral groove 410 of the first copper sleeve 41 and reaches the spacer sleeve 3. After the grease fills the annular groove 421, it reaches the second copper sleeve 43, moves along the unidirectional spiral groove 410 of the second copper sleeve 43, and finally is discharged from the lower drain cup 13. This ensures that the guide structure formed by the first guide sleeve 3, the first copper sleeve 41, the spacer sleeve 42, and the second copper sleeve 43 is fully lubricated. The grid rings 44 at both ends of the guide structure also prevent grease leakage. When injecting grease, one of the upper drain cups 12 can be selected for injection, while the others are blocked. One of the lower drain cups 13 can be depressurized, while the others are also blocked. Alternatively, all upper drain cups 12 can be injected with grease, while all lower drain cups 13 are depressurized.

[0036] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A shield machine lifting cylinder, comprising a cylinder barrel (1), a first piston rod (2), a first guide sleeve (3), a spacer assembly (4), a piston (5), a second piston rod (6), a second guide sleeve (7) and a gland (8), characterized in that: The spacer assembly (4) is arranged between the inner wall of the cylinder (1) and the outer wall of the first piston rod (2), and comprises a first copper sleeve (41), a spacer sleeve (42), and a second copper sleeve (43) arranged in sequence from the first guide sleeve (3) to the pressure cover (8), and a unidirectional spiral groove (410) is provided on the inner wall of each of the first copper sleeve (41) and the second copper sleeve (43).

2. The shield machine lifting cylinder according to claim 1, characterized in that: The inner walls of the first copper sleeve (41) and the second copper sleeve (43) are both sprayed with a polytetrafluoroethylene coating containing molybdenum disulfide.

3. The shield machine lifting cylinder according to claim 1, characterized in that: A grid ring (44) is provided on the inner wall of one end of the first guide sleeve (3) away from the first copper sleeve (41), and a grid ring (44) is also provided on the inner wall of one end of the second copper sleeve (43) away from the spacer sleeve (42).

4. The shield machine lifting cylinder according to claim 3, characterized in that: A dust ring (45) is provided on the outer side of the grid ring (44) on the first guide sleeve (3).

5. The shield machine lifting cylinder according to claim 4, characterized in that: An O-shaped sealing ring (46) is provided on the outer wall of one end of the first guide sleeve (3) away from the first copper sleeve (41), and an O-shaped sealing ring (46) is also provided on the outer wall of one end of the second copper sleeve (43) away from the spacer sleeve (42).

6. The shield machine lifting cylinder according to claim 1, characterized in that: An annular groove (421) is provided on the outer periphery of the spacer (42).

7. The shield machine lifting cylinder according to claim 1, characterized in that: An upper oil drain cup (12) and a lower oil drain cup (13) are provided on the outer wall of the cylinder (1), and the upper oil drain cup (12) and the lower oil drain cup (13) are distributed corresponding to the first guide sleeve (3), the first copper sleeve (41), the spacer sleeve (42) and the second copper sleeve (43).

8. The shield machine lifting cylinder according to claim 1, characterized in that: The two sides of the piston (5) in the cylinder (1) are respectively a rodless chamber (10) and a rod chamber (11); the second piston rod (6) is respectively provided with a first oil passage (63) communicating with the rodless chamber (10) and a second oil passage (64) communicating with the rod chamber (11).

9. The shield machine lifting cylinder according to claim 8, characterized in that: The outer end of the second piston rod (6) passes through the pressure cover (8), and a tightening nut (9) for locking the pressure cover (8) is provided on the outer side of the pressure cover (8); a first oil port (61) and a second oil port (62) are provided on the outer wall near the end of the second piston rod (6), the first oil port (61) is connected to the first oil channel (63), and the second oil port (62) is connected to the second oil channel (64).

10. The shield machine lifting cylinder according to claim 9, characterized in that: An oil port cover plate (60) is provided on both the first oil port (61) and the second oil port (62).

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