Swing oil cylinder of backhoe loader

Abstract

The invention belongs to the technical field of backhoe loaders, and discloses a swing oil cylinder of a backhoe loader, which comprises a cylinder body serving as a main body bearing structure of the swing oil cylinder and providing an accommodating space for internal hydraulic oil; the piston rod is connected to the middle of the cylinder body, reciprocates under the action of hydraulic oil and converts hydraulic energy into mechanical energy; the two oil ports are connected to the outer side of the cylinder body and are used as channels for hydraulic oil to enter and exit from the cylinder body; according to the swing oil cylinder of the backhoe loader, through cooperative operation of magnetic attraction and a mechanical structure, the sealing performance is remarkably improved, the anti-permeation sealing ring can be comprehensively extruded, a multi-layer sealing protection system is formed, in the operation process, the sealing performance of the swing oil cylinder is greatly improved, and the service life of the swing oil cylinder is prolonged. Tiny self-movement is formed through magnetic attraction, so that hydraulic oil leakage is effectively prevented, normal operation of equipment is guaranteed, and faults and pollution problems caused by leakage are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of backhoe loaders, and in particular relates to a swing oil cylinder for a backhoe loader. Background Art

[0002] Backhoe loaders are widely used in the construction and mining sectors. One of their core components is the excavation mechanism, of which the swing cylinder is particularly important. As a key actuator in backhoe loaders, the swing cylinder drives the excavating arm to rotate 360 degrees, thus enabling all-around excavation operations. Its performance directly affects the efficiency and stability of the excavator. The existing swing cylinder is prone to wear and leakage during long-term operation, resulting in a decrease in the excavation performance of the excavator. Summary of the Invention

[0003] The present invention addresses the problem in the prior art that the swing cylinder is prone to wear and leakage during long-term operation, resulting in reduced digging performance. The present invention proposes the following technical solutions: A swing cylinder for an excavator loader comprises: a cylinder body, serving as the main bearing structure of the swing cylinder and providing a space for accommodating internal hydraulic oil; The piston rod is connected to the middle of the cylinder body and reciprocates under the action of the hydraulic oil to convert hydraulic energy into mechanical energy; There are two oil ports connected to the outside of the cylinder body, which are channels for hydraulic oil to enter and exit the cylinder body; There are two sealing heads, which are respectively connected to the piston rod and one end of the cylinder body, and are used to connect to the swing arm of the backhoe loader; Buffer sealing assembly, including magnetic attraction parts, upper and lower movable structures, left and right movable structures, anti-penetration sealing rings and wear-resistant sealing rings; The magnetic component is connected to the sealing head, the upper and lower movable structures are connected to the cylinder body, the left and right movable structures are connected to the cylinder body, the anti-permeation sealing ring is connected to the left and right movable structures, and the wear-resistant sealing ring is connected to the anti-permeation sealing ring. When the magnetic component moves vertically, it drives the left and right movable structures to move toward the center line of the cylinder body through the upper and lower movable structures. The left and right movable structures move toward the center line of the cylinder body and the wear-resistant sealing ring is driven toward the cylinder body to fit the outer side of the piston rod.

[0004] As a preferred embodiment of the above technical solution, the upper and lower movable structures include: A first magnet ring connected to the cylinder body; A mounting post, plugged into the first magnet ring; a horizontal bar connected to the mounting post; a return spring connected to the horizontal bar; The positioning column passes through the horizontal bar, and the magnet ring drives the return spring through the installation column and the horizontal bar to be compressed along the outer side of the positioning column.

[0005] As a preferred embodiment of the above technical solution, the upper and lower movable structure further includes: a fixing ring connected to the horizontal bar; The magnet ring is connected to the fixed ring, and the horizontal bar drives the left and right movable structures to operate through the magnet ring.

[0006] As a preferred embodiment of the above technical solution, the left and right movable structures include: a moving block connected to the cylinder; A second magnet ring is connected to the moving block, and the second magnet ring cooperates with the magnet ring to drive the moving block to move; a fixed sleeve connected to the moving block; a guide post connected to the fixing sleeve; The pushing block is connected to the guide column, and the pushing block and the moving block are limited in displacement direction by the fixing sleeve and the guide column.

[0007] As a preferred embodiment of the above technical solution, the left and right movable structures further include: a driving member connected to the moving block; A matching member connected to the pushing block, wherein the pushing block and the moving block are displaced by the matching member and the driving member; The reset structure is connected to the moving block.

[0008] As a preferred embodiment of the above technical solution, the reset structure includes: The stretching member is connected to the interior of the moving block and drives the moving block to reset.

[0009] As a preferred embodiment of the above technical solution, the magnetic attraction member is an electromagnet with adjustable magnetic strength. The electromagnet adjusts the magnetic strength by changing the current, thereby controlling the movement amplitude of the upper and lower movable structures and the displacement distance of the left and right movable structures.

[0010] As a preferred embodiment of the above technical solution, the anti-permeation sealing ring adopts a multi-layer composite structure, the inner layer is a high-elastic rubber material for sealing, the outer layer is a polytetrafluoroethylene coating material for oil penetration prevention and wear resistance, and a buffer rubber layer is provided between the anti-permeation sealing ring and the wear-resistant sealing ring.

[0011] As a preferred embodiment of the above technical solution, a positioning groove is provided at the connection portion between the sealing head and the swing arm of the backhoe loader, and the positioning groove is used to cooperate with a positioning protrusion on the swing arm to achieve positioning.

[0012] The beneficial effects of the present invention are: (1) The swing cylinder of this excavator loader achieves a significant improvement in sealing performance through the coordinated operation of magnetic attraction and mechanical structure. It can fully squeeze the anti-penetration sealing ring to form a multi-layer sealing protection system. During operation, it forms a small self-movement through magnetic attraction, thereby effectively preventing hydraulic oil leakage, ensuring the normal operation of the equipment, and reducing failures and pollution problems caused by leakage; (2) During the piston rod reset phase, the repulsive reverse resistance generated by the same magnetic poles plays a key role, acting like a built-in "flexible barrier" that gradually dissipates the piston rod's inertia, greatly reducing the impact force at the moment of reset and avoiding the violent vibration caused by traditional rigid reset. This design not only extends the service life of the equipment components, but also improves the operator's work comfort and reduces noise pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The figure shows a schematic structural diagram of a swing cylinder of a backhoe loader in Example 1; Figure 2 Shown is a cross-sectional view of a swing cylinder of an excavator loader in Example 1; Figure 3 Shown is Figure 2 Schematic diagram of the structure of area A; Figure 4 The figure shows the installation structure diagram of the installation column in Example 1; Figure 5 Shown is Figure 4 Schematic diagram of the structure of area B in the middle; Figure 6 Shown is a schematic diagram of the installation structure of the push block in Example 1; Figure 7 Shown is a cross-sectional view of the moving block in Example 1; Figure 8 What is shown is a schematic diagram of the installation structure of the guide column in Example 1.

[0014] In the figure: 1. Cylinder body; 2. Piston rod; 3. Oil port; 4. Sealing head; 51. Magnet ring 1; 52. Mounting column; 53. Horizontal bar; 54. Return spring; 55. Fixed ring; 56. Magnet ring; 57. Positioning column; 61. Moving block; 62. Fixed sleeve; 63. Guide column; 64. Pushing block; 65. Tensile member; 66. Magnet ring 2; 67. Driving member; 68. Matching member; 69. Movable plate; 610. Limiting column; 611. Return member; 7. Anti-penetration sealing ring; 8. Wear-resistant sealing ring; 9. Magnetic member. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Example

[0016] The present invention provides a swing cylinder for an excavator loader, such as Figures 1 to 8 As shown, it includes: a cylinder body 1, a piston rod 2, an oil port 3 and a sealing head 4. The cylinder body 1 serves as the main bearing structure of the swing cylinder and provides a storage space for the internal hydraulic oil; the piston rod 2 is connected to the middle of the cylinder body 1 and performs reciprocating motion under the action of the hydraulic oil to convert hydraulic energy into mechanical energy; there are two oil ports 3 connected to the outside of the cylinder body 1, which are the channels for the hydraulic oil to enter and exit the cylinder body 1; there are two sealing heads 4, which are respectively connected to one end of the piston rod 2 and the cylinder body 1, and are used to connect with the swing arm of the excavator loader; a buffer sealing assembly, a positioning groove is provided at the connection part between the sealing head 4 and the swing arm of the excavator loader, and the positioning groove is used to cooperate with the positioning protrusion on the swing arm to achieve precise positioning, including a magnetic part 9, an upper and lower movable structure, a left and right movable structure, an anti-permeation sealing ring 7 and a wear-resistant sealing ring 8; the magnetic part 9 is connected to the sealing head 4, The upper and lower movable structures are connected to the cylinder body 1, the left and right movable structures are connected to the cylinder body 1, the anti-permeation sealing ring 7 is connected to the left and right movable structures, and the wear-resistant sealing ring 8 is connected to the anti-permeation sealing ring 7. The anti-permeation sealing ring 7 adopts a multi-layer composite structure, the inner layer is a high-elastic rubber material for sealing, and the outer layer is a polytetrafluoroethylene coating material for oil penetration prevention and wear resistance, and a buffer rubber layer is provided between the anti-permeation sealing ring 7 and the wear-resistant sealing ring 8. When the magnetic component 9 moves vertically, the left and right movable structures are driven to move toward the center line of the cylinder body 1 through the upper and lower movable structures. The left and right movable structures move toward the center line of the cylinder body 1 by driving the wear-resistant sealing ring 8 toward the cylinder body 1 to fit the outer side of the piston rod 2. The magnetic component 9 is an electromagnet with adjustable magnetic strength. The electromagnet adjusts the magnetic strength by changing the current, thereby controlling the movement amplitude of the upper and lower movable structures and the displacement distance of the left and right movable structures.

[0017] When the piston rod 2 is reset and approaches the reference point, the repulsive force rapidly generated between the like magnetic poles forms a reverse resistance, just like building a "flexible barrier" inside the oil cylinder. By gradually offsetting the movement inertia of the piston rod 2, the impact force at the moment of reset is effectively reduced, avoiding the violent vibration and impact that may be caused by traditional rigid reset, making the reset process smoother and softer, and when resetting to the reference point, the wear-resistant sealing ring 8 between the piston rod 2 and the cylinder body 1 is squeezed more tightly, thereby improving the sealing.

[0018] During use, since the external hydraulic oil enters the cylinder body 1 along the oil port 3, the hydraulic oil drives the piston rod 2 to move inside the cylinder body 1, and at the same time drives one of the sealing heads 4 to move. When the sealing head 4 moves, it drives the magnetic attraction part 9 to move, so that the magnetic attraction part 9 is away from the upper and lower movable structures. At this time, the upper and lower movable structures, the left and right movable structures, the anti-penetration sealing ring 7 and the wear-resistant sealing ring 8 are reset. The magnetic attraction of the magnetic attraction part 9 drives the upper and lower movable structures to move downward. When the upper and lower movable structures move downward, the left and right movable structures are driven laterally by magnetism. When the left and right movable structures move laterally, the anti-penetration sealing ring 7 is driven to move. When the anti-penetration sealing ring 7 moves, it drives the wear-resistant sealing ring 8 to fit with the outer side of the piston rod 2, thereby improving the sealing performance.

[0019] Specifically, oil ports 3 are provided on both sides of the outer surface of the cylinder body 1, and a piston rod 2 is movably connected inside the cylinder body 1. A multi-layer sealing ring is provided on the outside of the piston rod 2. The piston rod 2 passes through the cylinder body 1, and a multi-layer sealing gasket is provided at the position on the outside of the piston rod 2 corresponding to the position where the cylinder body 1 passes through. A sealing head 4 is fixedly installed at one end of the piston rod 2 and one end of the cylinder body 1. A magnetic component 9 is clamped and installed at the bottom end of the sealing head 4 on the piston rod 2. An upper and lower movable structure is movably connected to the cylinder body 1 at the position corresponding to the bottom end of the magnetic component 9, and a left and right movable structure is movably connected to the cylinder body 1 at the position corresponding to the bottom end of the upper and lower movable structures. An anti-penetration sealing ring 7 is fit-connected to one end of the left and right movable structure, and a wear-resistant sealing ring 8 is fit-connected to one end of the anti-penetration sealing ring 7.

[0020] like Figure 2 、 Figure 3 、 Figure 6 and Figure 7 As shown, the left and right movable structures include: a moving block 61, a fixed sleeve 62, a guide column 63, a pushing block 64, a stretching member 65, a second magnet ring 66, a driving member 67 and a matching member 68. The moving block 61 is connected to the cylinder body 1; the second magnet ring 66 is connected to the moving block 61, and the second magnet ring 66 and the magnet ring 56 cooperate to drive the moving block 61 to move; the fixed sleeve 62 is connected to the moving block 61; the guide column 63 is connected to the fixed sleeve 62; the pushing block 64 is connected to the guide column 63, and the pushing block 64 and the moving block 61 are restricted in displacement direction by the fixed sleeve 62 and the guide column 63; the driving member 67 is connected to the moving block 61; the matching member 68 is connected to the pushing block 64, and the pushing block 64 and the moving block 61 are displaced by the matching member 68 and the driving member 67; the stretching member 65 is connected to the inside of the moving block 61 to drive the moving block 61 to reset.

[0021] Since the left and right movable structures need to be reset after operation, the wear-resistant sealing ring 8 is prevented from being in constant contact with the piston rod 2, which makes it more difficult to move the piston rod 2 and causes accelerated wear between the wear-resistant sealing ring 8 and the piston rod 2, thereby effectively improving the service life of the wear-resistant sealing ring 8 and the piston rod 2.

[0022] During use, as the magnet ring 56 descends, the magnet ring 56 drives the second magnet ring 66 to move, and when the second magnet ring 66 moves, it drives the fixed sleeve 62 to move, and when the fixed sleeve 62 moves, it drives the stretching member 65 to stretch, and at the same time drives the fixed sleeve 62 to move on the guide column 63. At this time, under the cooperation of the driving member 67 and the matching member 68, the pushing block 64 moves, and when the pushing block 64 moves, it drives the anti-permeation sealing ring 7 to move, and when the anti-permeation sealing ring 7 moves, it drives the wear-resistant sealing ring 8 to squeeze the piston rod 2, so that the sealing between the wear-resistant sealing ring 8 and the piston rod 2 is improved due to the increase in the extrusion force.

[0023] Specifically, the moving block 61 is slidably connected to the inside of the cylinder body 1, and a fixed sleeve 62 is symmetrically embedded and installed on one end surface of the moving block 61. Guide columns 63 are slidably connected inside the two fixed sleeves 62. The same pushing block 64 is plugged and connected between the two guide columns 63. A stretching member 65 is fixedly installed inside the moving block 61, and a second magnet ring 66 is embedded and installed on the end of the inner wall of the moving block 61 away from the piston rod 2. A driving member 67 is embedded and installed on the end surface of the moving block 61 close to the piston rod 2, and a matching member 68 is embedded and installed on the end surface of the pushing block 64 close to the moving block 61.

[0024] The tensile member 65 in the present invention is a tensile spring with elasticity, the driving member 67 and the matching member 68 are magnets with magnetism, and the magnetic poles of the opposing surfaces of the two magnets are the same.

[0025] like Figure 2 、 Figure 4 and Figure 5 As shown, the upper and lower movable structures include: a magnet ring 51, a mounting column 52, a horizontal bar 53, a return spring 54, a fixed ring 55, a magnet ring 56 and a positioning column 57. The magnet ring 51 is connected to the cylinder body 1; the mounting column 52 is plugged into the magnet ring 51; the horizontal bar 53 is connected to the mounting column 52; the return spring 54 is connected to the horizontal bar 53; the positioning column 57 passes through the horizontal bar 53, and the magnet ring 51 drives the return spring 54 to be compressed along the outer side of the positioning column 57 through the mounting column 52 and the horizontal bar 53. The fixed ring 55 is connected to the horizontal bar 53; the magnet ring 56 is connected to the fixed ring 55, and the horizontal bar 53 drives the left and right movable structures to operate through the magnet ring 56.

[0026] Since the left and right movable structures require a driving structure to operate, the upper and lower movable structures drive the magnet ring 56 to move. The magnet ring 56 cooperates with the second magnet ring 66 to drive the left and right movable structures to operate, reducing the difficulty of operating the left and right movable structures.

[0027] When in use, after the magnetic attraction part 9 is energized, it generates a magnetic field that is perpendicular to the ground and identical to the top magnetic pole of the magnet ring 1 51, driving the magnet ring 1 51 to move. When the magnet ring 1 51 moves, the horizontal bar 53 is driven by the mounting column 52 to move along the outside of the positioning column 57, compressing the reset spring 54 and driving the fixing ring 55 and the magnet ring 56 to descend. When the magnet ring 56 descends, the closer the distance between the center area of its magnetic pole and the magnet ring 2 66 is, the greater the driving force on the magnet ring 2 66, thereby changing the distance between the driving part 67 and the matching part 68, and increasing the squeezing force between the driving part 67 and the matching part 68.

[0028] Specifically, a plurality of positioning posts 57 are embedded and installed in a circular array with the center point as the reference inside the cylinder body 1, and a horizontal bar 53 is sleeved on the outside of the positioning post 57. The tops of the plurality of horizontal bars 53 are embedded and installed with mounting posts 52. The same magnet ring 1 51 is clamped and installed between the tops of the plurality of mounting posts 52, and the same fixing ring 55 is installed between the bottom ends of the plurality of horizontal bars 53. A magnet ring 56 is clamped and installed at the bottom end of the fixing ring 55. The inner wall edge of the magnet ring 56 is chamfered. The magnetic poles of the magnet ring 56 and the opposite surfaces of the magnet ring 2 66 are the same. The magnetic poles of the magnetic attraction part 9 after power is applied are the same as the magnetic poles of the opposite surface of the magnet ring 1 51. The magnet ring 1 51 drives the reset spring 54 to be compressed along the outside of the positioning post 57 through the mounting post 52 and the horizontal bar 53, and the magnet ring 56 drives the left and right movable structures to operate.

[0029] like Figure 2 and Figure 8 As shown, the left and right movable structures also include: a movable plate 69, a limiting column 610 and a reset member 611; the movable plate 69 is movably connected to the inside of the pushing block 64, and the limiting columns 610 are embedded and installed on both sides of the top and bottom ends of the movable plate 69 inside the pushing block 64, and a reset member 611 is installed between the inside of the movable plate 69 and the outside of the limiting column 610.

[0030] Since a gap is generated between two adjacent pushing blocks 64 when the pushing blocks 64 move outward, a movable plate 69 is provided between the two pushing blocks 64 to make up for the distance between the two pushing blocks 64. When the gap between the two pushing blocks 64 increases, the movable plate 69 blocks the gap. When the gap between the two pushing blocks 64 decreases, the movable plate 69 enters the interior of the two pushing blocks 64. Placement grooves are provided on both sides of the pushing blocks 64, and the movable plate 69 is located inside the placement grooves.

[0031] During use, the movement of the pushing block 64 drives the limiting column 610 to move, and the limiting column 610 squeezes the reset member 611 when it moves. At this time, the reset member 611 is compressed, and at the same time, the movable plate 69 moves out between the two pushing blocks 64. The moved movable plate 69 blocks the gap between the two pushing blocks 64, thereby achieving the purpose of fully squeezing the anti-permeation sealing ring 7.

[0032] The core characteristic of the reset member 611 involved in the present invention is that it has the ability to stretch and retract. It can automatically restore to its original state after being displaced by force through its own elastic deformation or mechanical structure change, thereby realizing the reset function of related components. In the present invention, the reset member 611 is specifically a rubber pad.

[0033] Working principle: During actual use of the backhoe loader swing cylinder, external hydraulic oil enters the cylinder body 1 through the oil port 3. At this time, the hydraulic oil drives the piston rod 2 to move inside the cylinder body 1, and at the same time drives one of the sealing heads 4 to move. When the sealing head 4 moves, it drives the magnetic attraction part 9 to move, so that the magnetic attraction part 9 moves away from the upper and lower movable structures. At this time, the upper and lower movable structures, the left and right movable structures, the anti-permeation sealing ring 7 and the wear-resistant sealing ring 8 are reset; At this time, after the magnetic attraction member 9 is energized, it drives the magnet ring 1 51 to move. When the magnet ring 1 51 moves, it drives the horizontal bar 53 to move along the outside of the positioning column 57 through the mounting column 52, compressing the reset spring 54 and driving the fixing ring 55 and the magnet ring 56 to descend. The magnetic poles inside the magnet ring 56 and the end of the magnet ring 2 66 are the same, which are used to repel each other. When the magnet ring 56 descends, the closer the distance between the middle of the magnet ring 56 and the magnet ring 2 66 is, the greater the repulsion force between the like magnetic poles inside the magnet ring 56 and the end of the magnet ring 2 66 is, and thus the greater the driving force on the magnet ring 2 66. Then, the magnet ring 56 drives the second magnet ring 66 to move. When the second magnet ring 66 moves, it drives the fixed sleeve 62 to slide. When the fixed sleeve 62 moves, it drives the stretching member 65 to stretch, and at the same time drives the fixed sleeve 62 to move on the guide column 63. At this time, under the cooperation of the driving member 67 and the matching member 68, the pushing block 64 moves. When the pushing block 64 moves, it drives the anti-permeation sealing ring 7 to move. When the anti-permeation sealing ring 7 moves, it drives the wear-resistant sealing ring 8 to squeeze the piston rod 2. The squeezing force of the wear-resistant sealing ring 8 on the piston rod 2 is increased, thereby improving the sealing performance. At the same time, the movement of the pushing block 64 drives the limiting column 610 to move. When the limiting column 610 moves, it squeezes the reset member 611. At this time, the reset member 611 is compressed, and at the same time, the movable plate 69 moves out between the two pushing blocks 64. The moved movable plate 69 blocks the gap between the two pushing blocks 64, thereby achieving the purpose of fully squeezing the anti-permeation sealing ring 7.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. A swing cylinder for an excavator loader, characterized in that: include: The cylinder body (1) serves as the main bearing structure of the swing oil cylinder and provides a space for accommodating the internal hydraulic oil; The piston rod (2) is connected to the middle of the cylinder (1) and performs reciprocating motion under the action of the hydraulic oil, thereby converting hydraulic energy into mechanical energy; Two oil ports (3) are connected to the outside of the cylinder (1) and are passages for hydraulic oil to enter and exit the cylinder (1); Two sealing heads (4) are connected to the piston rod (2) and one end of the cylinder body (1) respectively, and are used to connect to the swing arm of the excavator loader; A buffer seal assembly, comprising a magnetic attraction member (9), an upper and lower movable structure, a left and right movable structure, an anti-penetration sealing ring (7) and a wear-resistant sealing ring (8); The magnetic member (9) is connected to the sealing head (4), the upper and lower movable structures are connected to the cylinder body (1), the left and right movable structures are connected to the cylinder body (1), the anti-permeation sealing ring (7) is connected to the left and right movable structures, and the wear-resistant sealing ring (8) is connected to the anti-permeation sealing ring (7). When the magnetic member (9) moves vertically, it drives the left and right movable structures to move toward the center line of the cylinder body (1) through the upper and lower movable structures. The left and right movable structures move toward the center line of the cylinder body (1) and the wear-resistant sealing ring (8) is driven toward the cylinder body (1) to fit the outer side of the piston rod (2).

2. The swing cylinder for backhoe loader according to claim 1, characterized in that: The up and down movable structure comprises: A first magnet ring (51) connected to the cylinder (1); A mounting post (52) plugged into the first magnet ring (51); a horizontal bar (53) connected to the mounting post (52); a return spring (54) connected to the horizontal bar (53); The positioning column (57) passes through the horizontal bar (53), and the magnet ring (51) drives the return spring (54) through the mounting column (52) and the horizontal bar (53) to be compressed along the outer side of the positioning column (57).

3. The swing cylinder for backhoe loader according to claim 2, characterized in that: The up and down movable structure further comprises: A fixing ring (55) connected to the horizontal bar (53); The magnet ring (56) is connected to the fixed ring (55), and the horizontal bar (53) drives the left and right movable structures to operate through the magnet ring (56).

4. The swing cylinder for backhoe loader according to claim 3, characterized in that: The left and right movable structure includes: A moving block (61) connected to the cylinder (1); The second magnet ring (66) is connected to the moving block (61), and the second magnet ring (66) and the magnet ring (56) cooperate to drive the moving block (61) to move; A fixed sleeve (62) connected to the moving block (61); A guide post (63) connected to the fixing sleeve (62); The pushing block (64) is connected to the guide column (63), and the pushing block (64) and the moving block (61) limit the displacement direction through the fixing sleeve (62) and the guide column (63).

5. The swing cylinder for backhoe loader according to claim 4, characterized in that: The left and right movable structure further includes: A driving member (67) connected to the moving block (61); A matching member (68) is connected to the pushing block (64), and the pushing block (64) and the moving block (61) are displaced through the matching member (68) and the driving member (67); A reset structure is connected to the moving block (61).

6. The swing cylinder for backhoe loader according to claim 5, characterized in that: The reset structure includes: The stretching member (65) is connected to the interior of the moving block (61) and drives the moving block (61) to reset.

7. The swing cylinder for backhoe loader according to claim 1, characterized in that: The magnetic attraction member (9) is an electromagnet capable of adjusting the magnetic strength. The electromagnet adjusts the magnetic strength by changing the magnitude of the current, thereby controlling the movement amplitude of the upper and lower movable structures and the displacement distance of the left and right movable structures.

8. The swing cylinder for backhoe loader according to claim 1, characterized in that: The anti-permeation sealing ring (7) adopts a multi-layer composite structure, the inner layer is made of a high-elasticity rubber material for sealing, the outer layer is made of a polytetrafluoroethylene coating material for preventing oil penetration and wear resistance, and a buffer rubber layer is provided between the anti-permeation sealing ring (7) and the wear-resistant sealing ring (8).

9. The swing cylinder for backhoe loader according to claim 1, characterized in that: A positioning groove is provided at the connection portion between the sealing head (4) and the swing arm of the excavator loader, and the positioning groove is used to cooperate with a positioning protrusion on the swing arm to achieve positioning.

Images