Electric hydraulic dismounting device for roller

Abstract

The utility model discloses an electric hydraulic dismounting device for a roller, which relates to the technical field of copper rod production and comprises a cart, an electric hydraulic power mechanism and a single-oil-pipe self-resetting hydraulic tool, and the electric hydraulic power mechanism is mounted on the cart; the single-oil-pipe self-resetting hydraulic tool comprises a hydraulic cylinder body, the outer side of the bottom of the hydraulic cylinder body is detachably connected with the top end of a roller bush connecting cylinder, a piston is vertically installed in the hydraulic cylinder body in a sliding mode, the middle of the piston is fixedly connected with the top end of a piston rod, and a guide limiting ring is arranged on the inner side of the bottom of the hydraulic cylinder body. The guide limiting ring is vertically connected with the piston rod in a sliding mode, and a protruding edge is connected to the inner side of the bottom of the roller bush connecting cylinder in an integrally-formed mode. According to the electric hydraulic dismounting device for the roller, the electric hydraulic power mechanism is matched with the single-oil-pipe self-resetting hydraulic tool to work, the dismounting efficiency of the roller is improved, and the labor intensity of manually pressing the hydraulic pump can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of copper rod production, in particular to an electric hydraulic disassembly device for a roller. Background Art

[0002] The copper rod continuous casting and rolling line obtains the required copper rod diameter through continuous rolling of the rolling mill rolls and the billet. During the rolling process, the rolls are constantly squeezed and rubbed against the billet, which will cause certain damage to the roll surface. After a period of use, the rolls need to be removed and replaced.

[0003] The inner side of the roller fits with the outer side of the tapered bushing, which is then fitted onto the outer tapered spindle of the mill. During installation, a hydraulic tool is used to press the bottom of the bushing to the shoulder of the mill spindle. A press key is then passed through the square holes of the spindle and sleeve, and the spindle, bushing, and roller are fixed together using the press key.

[0004] When disassembling the roll, follow the reverse steps. Since the bushing is pressed by a hydraulic tool, the biggest difficulty in the roll disassembly process is how to quickly remove the bushing from the rolling mill spindle. The original disassembly and assembly tool is a manual hydraulic pump used in conjunction with the disassembly and assembly hydraulic tool. During use, there are the following problems: the disassembly and assembly speed is slow, and the labor intensity of manually pressing the hydraulic pump is high. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the existing defects and provide an electric hydraulic disassembly device for rolling mill rollers. The electric hydraulic power mechanism is used in conjunction with a single oil pipe self-resetting hydraulic tool to replace the manual hydraulic pump, which is beneficial to improving the disassembly efficiency of the rolling mill rollers, reducing the labor intensity of manually pressing the hydraulic pump, and effectively solving the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a roller electric hydraulic disassembly device, comprising a cart, and further comprising:

[0007] An electro-hydraulic power mechanism, mounted on a cart;

[0008] A single-oil-tube self-resetting hydraulic tool comprises a hydraulic cylinder body, a piston, a piston rod, a return spring, a guide limit ring, a roller bushing connecting tube, a convex edge and a fan-shaped notch. The outer side of the bottom of the hydraulic cylinder body is detachably connected to the top of the roller bushing connecting tube. A piston is vertically slidably installed in the hydraulic cylinder body. The middle part of the piston is fixedly connected to the top of the piston rod. A guide limit ring is provided on the inner side of the bottom of the hydraulic cylinder body. The guide limit ring is vertically slidably connected to the piston rod. The inner side of the bottom of the roller bushing connecting tube is integrally formed with a convex edge. Four fan-shaped notches are provided in a ring array on the convex edge. A circular groove is provided in the center of the top of the piston rod. The bottom of the circular groove is connected to the bottom end of the return spring, and the top of the return spring is connected to the top of the hydraulic cylinder body.

[0009] The trolley is convenient for moving the electric hydraulic power mechanism. The single-tube self-resetting hydraulic tool can also be placed on the trolley when not in use, making it easy to move the tool to another location as needed.

[0010] When in use, align the four sector-shaped notches at the bottom of the convex edge with the four sector-shaped protrusions at the top of the bushing, allow the top of the bushing and the four sector protrusions to extend into the roller bushing connecting tube, and then rotate the roller bushing connecting tube and the hydraulic cylinder body, the four sector-shaped protrusions and the four sector-shaped notches are staggered, the electric hydraulic power mechanism works, and hydraulic oil is filled into the top of the hydraulic cylinder body, allowing the piston and piston rod to descend relative to the hydraulic cylinder body. During this process, the return spring is stretched, and the piston rod is pressed against the top of the rolling mill main shaft. As the piston rod gradually extends from the bottom of the hydraulic cylinder body, the bushing moves up relative to the rolling mill main shaft, thereby removing the bushing from the top of the rolling mill main shaft, and the roller can be removed from the bottom of the bushing. After the electric hydraulic power mechanism stops working, the return spring shortens and resets, allowing the piston and piston rod to reset in the hydraulic cylinder body. It should be noted that when starting to use the single-tube self-resetting hydraulic tool, you need to remove the pressing key connecting the rolling mill main shaft and the bushing first.

[0011] Furthermore, the single-oil-tube self-resetting hydraulic tool further includes a flange and flange bolts. The flange is integrally formed and connected to the outer side of the bottom of the hydraulic cylinder body, and the flange is connected to the top of the roller bushing connecting tube via the flange bolts. The flange and flange bolts cooperate to achieve a detachable connection between the hydraulic cylinder body and the roller bushing connecting tube.

[0012] Furthermore, the single-tube self-resetting hydraulic tool also includes a sealing ring and a guide wear ring. Two annular mounting grooves are defined on the outer circumference of the piston, one of which houses the sealing ring, while the other houses the guide wear ring. The sealing ring seals the gap between the piston and the hydraulic cylinder to prevent oil leakage, while the guide wear ring guides the piston's sliding movement within the cylinder.

[0013] Furthermore, the single-tube self-resetting hydraulic tool also includes two locking holes, symmetrically located about the center of the roller bushing connecting tube, at the bottom of the roller bushing connecting tube. A press key and the locking holes can also be used to connect the roller bushing connecting tube to the bushing, replacing the pulling effect of the convex edge on the fan-shaped protrusion on the top of the bushing as the roller bushing connecting tube moves upward.

[0014] Furthermore, the single-tube self-resetting hydraulic tool further includes an arched handle, with two arched handles provided on either side of the roller bushing connecting tube. The two arched handles facilitate the user to grasp the roller bushing connecting tube and the hydraulic cylinder body and align the roller bushing connecting tube with the disassembly position.

[0015] Furthermore, the cart includes guardrails, a push handle, universal wheels, and a platform. Four universal wheels are installed at the four corners of the bottom of the platform, and the platform is installed with guardrails. Two push handles are provided on the top side of the guardrails. The universal wheels are equipped with brakes for easy fixation. The platform can be easily moved to the desired position with the help of the universal wheels and then fixed in place with the brakes. The push handle facilitates the movement of the platform, and the guardrails protect the edges of the platform to prevent items on the platform from falling.

[0016] Furthermore, the electro-hydraulic power mechanism includes a hydraulic oil tank, a hydraulic pump, a 3 / 5-way solenoid directional valve, oil pipe 1, and oil pipe 2. The hydraulic oil tank and hydraulic pump are respectively mounted on the vehicle deck. The outlet of the hydraulic oil tank is connected to the inlet of the hydraulic pump, which is connected to the 3 / 5-way solenoid directional valve via oil pipe 2. The 3 / 5-way solenoid directional valve is connected to the oil hole at the top of the hydraulic cylinder via oil pipe 1. The hydraulic pump delivers hydraulic oil from the hydraulic oil tank into the hydraulic cylinder via oil pipe 2, the 3 / 5-way solenoid directional valve, and oil pipe 1, enabling electronic control and replacing a manual hydraulic pump.

[0017] Furthermore, it also includes an electric hydraulic control system, which includes a control box, a knob switch, a power indicator light, a push button, a start button, an emergency stop switch, and a reset button. The control box is installed on the top of the guardrail near the push handle, and the control box is respectively equipped with a knob switch, a power indicator light, a push button, a start button, an emergency stop switch and a reset button.

[0018] Compared with the prior art, the beneficial effects of the electric hydraulic disassembly device for rollers are:

[0019] 1. First, remove the pressing key connecting the rolling mill main shaft and the bushing, align the four sector-shaped notches at the bottom of the convex edge with the four sector-shaped protrusions at the top of the bushing, and let the top of the bushing and the four sector-shaped protrusions extend into the roller bushing connecting cylinder. Then rotate the roller bushing connecting cylinder and the hydraulic cylinder body. The four sector-shaped protrusions are staggered with the four sector-shaped notches. The electric hydraulic power mechanism works, filling hydraulic oil into the top of the hydraulic cylinder body, allowing the piston and piston rod to descend relative to the hydraulic cylinder body. During this process, the return spring is stretched, and the piston rod is pressed against the top of the rolling mill main shaft. As the piston rod gradually extends from the bottom of the hydraulic cylinder body, the bushing moves upward relative to the rolling mill main shaft, thereby removing the bushing from the top of the rolling mill main shaft, and the roller can also be removed from the bottom of the bushing, which can quickly and labor-savingly complete the disassembly of the roller.

[0020] 2. The electric hydraulic power mechanism is used in conjunction with a single oil pipe self-resetting hydraulic tool to replace the manual hydraulic pump, which is beneficial to improving the disassembly efficiency of the rolls and reducing the labor intensity of manually pressing the hydraulic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the bottom structure of the single oil pipe self-resetting hydraulic tool in the utility model;

[0023] Figure 3 This is a schematic cross-sectional view of the single oil pipe self-resetting hydraulic tool in the present utility model;

[0024] Figure 4 This is a schematic diagram of the hydraulic principle of the electric hydraulic power mechanism in the present utility model;

[0025] Figure 5 This is the circuit diagram of the electric hydraulic control system in this utility model;

[0026] In the figure: 1 hydraulic oil tank, 2 hydraulic pump, 3 pressure gauge, 4 relief valve, 5 three-position five-way solenoid reversing valve, 6 single oil pipe self-resetting hydraulic tool, 61 hydraulic cylinder body, 62 flange, 63 flange bolt, 64 piston, 65 sealing ring, 66 guide wear ring, 67 piston rod, 68 return spring, 69 guide limit ring, 610 roller bushing connecting tube, 611 convex edge, 612 fan-shaped notch, 613 clamping hole, 614 arch handle, 7 electro-hydraulic control system, 71 control box, 72 knob switch, 73 power indicator light, 74 push button, 75 start button, 76 emergency stop switch, 77 reset button, 8 guardrail, 9 push handle, 10 oil pipe 1, 11 oil pipe 2, 12 handle, 13 reinforcement rod, 14 universal wheel, 15 car plate, 16 rolling mill main shaft, 17 bushing, 18 fan-shaped protrusion, 19 roller, 20 press key. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] For example 1, please refer to Figures 1 to 5 , the utility model provides a technical solution: a roller electric hydraulic disassembly device, including a cart, an electric hydraulic power mechanism and a single oil pipe self-resetting hydraulic tool 6;

[0029] The electro-hydraulic power mechanism is mounted on the cart;

[0030] The single-oil-tube self-resetting hydraulic tool 6 includes a hydraulic cylinder body 61, a piston 64, a piston rod 67, a return spring 68, a guide limit ring 69, a roller bushing connecting tube 610, a convex edge 611 and a fan-shaped notch 612. The outer side of the bottom of the hydraulic cylinder body 61 is detachably connected to the top of the roller bushing connecting tube 610. The piston 64 is vertically slidably installed in the hydraulic cylinder body 61. The middle part of the piston 64 is fixedly connected to the top of the piston rod 67. A guide limit ring 69 is provided on the inner side of the bottom of the hydraulic cylinder body 61. The guide limit ring 69 is vertically slidably connected to the piston rod 67. The inner side of the bottom of the roller bushing connecting tube 610 is integrally formed with a convex edge 611. Four fan-shaped notches 612 are provided in a ring array on the convex edge 611. A circular groove is provided in the center of the top of the piston rod 67. The bottom of the circular groove is connected to the bottom end of the return spring 68, and the top of the return spring 68 is connected to the top of the hydraulic cylinder body 61.

[0031] The guide limiting ring 69 is installed on the inner side of the bottom of the hydraulic cylinder body 61 through an external thread, which plays a role in guiding and limiting the piston rod to prevent the piston rod from being damaged due to overtravel.

[0032] The single-tube self-resetting hydraulic tool 6 also includes a flange 62 and flange bolts 63. The flange 62 is integrally formed and connected to the outer side of the bottom of the hydraulic cylinder 61. The flange 62 is connected to the top of the roller bushing connecting tube 610 via flange bolts 63. The flange 62 and flange bolts 63 cooperate to achieve a detachable connection between the hydraulic cylinder 61 and the roller bushing connecting tube 610.

[0033] The single-tube self-resetting hydraulic tool 6 also includes an arched handle 614, with two arched handles 614 provided on either side of the roller bushing connecting tube 610. The two arched handles 614 facilitate the user's grasp of the roller bushing connecting tube 610 and the hydraulic cylinder 61, and align the roller bushing connecting tube 610 with the disassembly position.

[0034] The cart includes guardrails 8, a push handle 9, universal wheels 14, and a platform 15. Four universal wheels 14 are installed at the four corners of the bottom of the platform 15. The guardrails 8 are installed on the platform 15, and two push handles 9 are set on one side of the top of the guardrails 8. The universal wheels 14 are equipped with wheel brakes for easy fixation. The platform 15 can be easily moved to the desired position with the help of the universal wheels 14 and then fixed in place with the wheel brakes. The push handle 9 facilitates the movement of the platform 15. The guardrails 8 protect the edges of the platform 15 to prevent items on the platform 15 from falling.

[0035] The cart also includes a handle 12 and a reinforcing rod 13. The reinforcing rod 13 is fixedly connected between the two push handles 9. The reinforcing rod 13 is used to increase the strength of the push handles 9. Two rubber handles 12 are respectively connected to the ends of the two push handles 9 away from the guardrail 8, which makes it convenient for users to hold the push handles 9 tightly.

[0036] The electric hydraulic power mechanism includes a hydraulic oil tank 1, a hydraulic pump 2, a three-position five-way electromagnetic reversing valve 5, an oil pipe 10 and an oil pipe 2 11. The hydraulic oil tank 1 and the hydraulic pump 2 are respectively installed on the vehicle plate 15. The outlet of the hydraulic oil tank 1 is connected to the inlet of the hydraulic pump 2. The outlet of the hydraulic pump 2 is connected to the three-position five-way electromagnetic reversing valve 5 through the oil pipe 2 11. The three-position five-way electromagnetic reversing valve 5 is connected to the oil hole on the top of the hydraulic cylinder body 61 through the oil pipe 10. The hydraulic pump 2 delivers the hydraulic oil in the hydraulic oil tank 1 into the hydraulic cylinder body 61 through the oil pipe 2 11, the three-position five-way electromagnetic reversing valve 5 and the oil pipe 10, which can realize electronic control operation and replace the manual hydraulic pump. The specific hydraulic principle can be referred to. Figure 4 , wherein the specific setting of the oil circuit can adopt the existing technology.

[0037] Hydraulic pump 2 uses a 70MPa hydraulic pump.

[0038] The electric hydraulic power mechanism also includes a pressure gauge 3 and a relief valve 4, each mounted on oil pipe 11. The pressure gauge 3 displays the hydraulic oil pressure, while the relief valve 4 controls the hydraulic oil's operating pressure. If the hydraulic oil's operating pressure is too high, the relief valve 4 allows the hydraulic oil to overflow. Therefore, the relief valve 4 is provided to adjust the hydraulic oil's operating pressure.

[0039] It also includes an electric hydraulic control system 7, which includes a control box 71, a knob switch 72, a power indicator light 73, a push button 74, a start button 75, an emergency stop switch 76, and a reset button 77. The control box 71 is installed on the top of the guardrail 8 on the side close to the push handle 9. The control box 71 is respectively equipped with a knob switch 72, a power indicator light 73, a push button 74, a start button 75, an emergency stop switch 76 and a reset button 77. The control box 71 is electrically connected to an external power supply through a cable. The control box 71 controls the hydraulic pump 2 and the three-position five-way electromagnetic reversing valve 5 to work through the operation of the knob switch 72, the push button 74, the start button 75, the emergency stop switch 76, and the reset button 77. The control circuit diagram is shown in FIG. Figure 5 As shown, the control box 71 controls the operation of the hydraulic pump 2 and the three-position five-way electromagnetic reversing valve 5 through the operation of the knob switch 72, the push button 74, the start button 75, the emergency stop switch 76, and the reset button 77, and the existing technology can also be used.

[0040] The trolley is convenient for moving the electric hydraulic power mechanism. The single oil pipe self-resetting hydraulic tool 6 is also placed on the trolley when not in use, so that it can be moved to a different position according to needs.

[0041] The installation method of the roller 19 is to first put the roller 19 on the outside of the bottom of the bushing 17, and then put the bushing 17 on the top of the rolling mill main shaft 16, and use a hydraulic tool to press the bushing 17 downward so that the bushing 17 is at the shoulder of the rolling mill main shaft 16. At this time, the keyhole on the bushing 17 corresponds to the keyhole on the rolling mill main shaft 16, and use a press key 20 to insert the keyholes on the bushing 17 and the rolling mill main shaft 16. At this time, the bottom of the press key 20 corresponds to the top of the roller 19, and the roller 19 will not move up relative to the bushing 17, completing the fixed installation of the roller 19, wherein four fan-shaped protrusions 18 are provided in a circular array on the outer peripheral side of the top of the bushing 17.

[0042] When in use, align the four sector-shaped notches 612 at the bottom of the convex edge 611 with the four sector-shaped protrusions 18 at the top of the bushing 17, and let the top of the bushing 17 and the four sector-shaped protrusions 18 extend into the roller bushing connecting tube 610. Then rotate the roller bushing connecting tube 610 and the hydraulic cylinder body 61, and the four sector-shaped protrusions 18 are staggered with the four sector-shaped notches 612. The electric hydraulic power mechanism works, and hydraulic oil is filled into the top of the hydraulic cylinder body 61, so that the piston 64 and the piston rod 67 descend relative to the hydraulic cylinder body 61. During this process, the return spring 68 is stretched, and the piston rod 67 presses against the top of the rolling mill main shaft 16. As the piston rod 67 gradually extends from the bottom of the hydraulic cylinder body 61, the bushing 17 moves upward relative to the rolling mill main shaft 16, thereby removing the bushing 17 from the top of the rolling mill main shaft 16, and the roller 19 can be removed from the bottom of the bushing 17. After the electric hydraulic power mechanism stops working, the reset spring 68 shortens and resets, allowing the piston 64 and the piston rod 67 to reset in the hydraulic cylinder body 61. The operator can quickly disassemble the next roller 19, saving disassembly time. It should be noted that when starting to use the single-tube self-resetting hydraulic tool 6, it is necessary to first remove the pressing key 20 connecting the rolling mill main shaft 16 and the bushing 17.

[0043] For example 2, please refer to Figures 1 to 5 The present invention provides a technical solution: an electric hydraulic disassembly device for a roller. The structure of this embodiment is roughly the same as that of the first embodiment, except that:

[0044] The single oil pipe self-resetting hydraulic tool 6 also includes a sealing ring 65 and a guide wear-resistant ring 66. Two annular mounting grooves are provided on the outer peripheral side of the piston 64, wherein the sealing ring 65 is installed in one of the annular mounting grooves and the guide wear-resistant ring 66 is installed in the other annular mounting groove.

[0045] The sealing ring 65 adopts a Y-shaped sealing ring.

[0046] The sealing ring 65 is used to seal the gap between the piston 64 and the hydraulic cylinder body 61 to prevent oil leakage, and the guide wear-resistant ring 66 guides the sliding of the piston 64 in the hydraulic cylinder body 61.

[0047] For example three, please refer to Figures 1 to 5 The present invention provides a technical solution: an electric hydraulic disassembly device for a roller. The structure of this embodiment is roughly the same as that of the second embodiment, except that:

[0048] The single-hose self-resetting hydraulic tool 6 also includes two locking holes 613, symmetrically located about the center of the roller bushing connecting tube 610, formed at the bottom. A press key 20, mated with the locking holes 613 and inserted into the keyhole on the bushing 17, connects the roller bushing connecting tube 610 to the bushing 17, replacing the pull of the ridge 611 on the fan-shaped protrusion 18 on the top of the bushing 17 as the roller bushing connecting tube 610 moves upward.

[0049] It is worth noting that the original disassembly hydraulic tool has a short working stroke of only about 1.5cm, which can easily damage the piston rod due to overtravel, and the oil seal is prone to oil leakage, making the overall maintenance and disassembly difficult and costly.

[0050] The overall structure of this application has the following advantages:

[0051] 1. The stroke is long, reaching 5cm, which is 3.5cm longer than the original tool, and will not cause damage to the tool due to overtravel;

[0052] 2. The sealing ring adopts a Y-type sealing ring plus a guide wear-resistant ring, which has a long service life and can be used for more than one year without oil leakage. It is a great improvement compared with the previous combined seal that needs to be replaced every two months or so;

[0053] 3. Maintenance is more convenient. The original tool has a complicated structure with many fixing screws, two sets of seals, and it is troublesome to disassemble and install the seals.

[0054] 4. Low maintenance cost. The original tool has three wearing parts, and the single maintenance cost is high. The new tool only has Y-type sealing ring as the wearing part, with low spare parts cost, low single maintenance cost, and reduced maintenance frequency.

[0055] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0056] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric hydraulic disassembly device for rollers, comprising a trolley, characterized in that: Also includes: An electro-hydraulic power mechanism, mounted on a cart; A single oil pipe self-resetting hydraulic tool (6) comprises a hydraulic cylinder (61), a piston (64), a piston rod (67), a reset spring (68), a guide limiting ring (69), a roller bushing connecting tube (610), a convex edge (611) and a fan-shaped notch (612), wherein the outer side of the bottom of the hydraulic cylinder (61) is detachably connected to the top of the roller bushing connecting tube (610), a piston (64) is vertically slidably installed in the hydraulic cylinder (61), and the middle of the piston (64) is fixedly connected to the top of the piston rod (67). A guide limiting ring (69) is provided on the inner side of the bottom of the hydraulic cylinder body (61), and the guide limiting ring (69) is vertically slidably connected to the piston rod (67). The inner side of the bottom of the roller bushing connecting tube (610) is integrally formed with a convex edge (611), and four fan-shaped notches (612) are provided in a circular array on the convex edge (611). A circular groove is provided at the center of the top of the piston rod (67), and the bottom of the circular groove is connected to the bottom end of the return spring (68), and the top end of the return spring (68) is connected to the top of the hydraulic cylinder body (61).

2. The roller electro-hydraulic disassembly device according to claim 1, characterized in that: The single oil pipe self-resetting hydraulic tool (6) further comprises a flange (62) and flange bolts (63); the bottom outer side of the hydraulic cylinder body (61) is integrally formed with the flange (62); the flange (62) is connected to the top end of the roller bushing connecting tube (610) via the flange bolts (63).

3. The electro-hydraulic roller disassembly device according to claim 1, characterized in that: The single oil pipe self-resetting hydraulic tool (6) further comprises a sealing ring (65) and a guide wear-resistant ring (66), and two annular mounting grooves are provided on the outer peripheral side of the piston (64), wherein the sealing ring (65) is installed in one of the annular mounting grooves, and the guide wear-resistant ring (66) is installed in the other annular mounting groove.

4. The electro-hydraulic roller disassembly device according to claim 1, characterized in that: The single oil pipe self-resetting hydraulic tool (6) further comprises a clamping hole (613), and the bottom of the roller bushing connecting cylinder (610) is provided with two clamping holes (613) that are symmetrical about the center of the roller bushing connecting cylinder (610).

5. The roller electro-hydraulic disassembly device according to claim 1, characterized in that: The single oil pipe self-resetting hydraulic tool (6) further comprises an arch handle (614), and two arch handles (614) are respectively provided on both sides of the roller bushing connecting tube (610).

6. The electro-hydraulic roller disassembly device according to claim 1, characterized in that: The cart comprises a guardrail (8), a push handle (9), a universal wheel (14) and a vehicle plate (15), wherein four universal wheels (14) are respectively installed at the four corners of the bottom of the vehicle plate (15), a guardrail (8) is installed on the vehicle plate (15), and two push handles (9) are provided on one side of the top of the guardrail (8).

7. The electro-hydraulic roller disassembly device according to claim 6, characterized in that: The electric hydraulic power mechanism comprises a hydraulic oil tank (1), a hydraulic pump (2), a three-position five-way electromagnetic reversing valve (5), an oil pipe 1 (10) and an oil pipe 2 (11). The hydraulic oil tank (1) and the hydraulic pump (2) are respectively installed on the vehicle plate (15). The outlet of the hydraulic oil tank (1) is connected to the inlet of the hydraulic pump (2). The outlet of the hydraulic pump (2) is connected to the three-position five-way electromagnetic reversing valve (5) through the oil pipe 2 (11). The three-position five-way electromagnetic reversing valve (5) is connected to the oil hole at the top of the hydraulic cylinder body (61) through the oil pipe 1 (10).

8. The electro-hydraulic roller disassembly device according to claim 6, characterized in that: The electric hydraulic control system (7) further comprises a control box (71), a rotary switch (72), a power indicator light (73), a push button (74), a start button (75), an emergency stop switch (76), and a reset button (77). The control box (71) is mounted on a side of the top of the guardrail (8) near the push handle (9). The control box (71) is respectively mounted with the rotary switch (72), the power indicator light (73), the push button (74), the start button (75), the emergency stop switch (76), and the reset button (77).

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