Roll bending cylinder

Abstract

The utility model provides a roll bending cylinder, and relates to the technical field of cylinder bodies. The outer side surface of the bushing is connected with the inner side surface of the cylinder body; the outer side face of the piston is slidably connected to the inner side face of the lining. One end of the rod body is connected with one end of the piston, and the rod body penetrates through one end of the cylinder body; according to the roll bending cylinder, the lining is arranged between the inner side face of the cylinder body and the outer side face of the piston, the impact force of the piston directly acts on the lining, the impact force of the piston is prevented from directly acting on the inner side face of the cylinder body, deformation of the inner side face of the cylinder body is reduced or avoided, the service life of the cylinder body is prolonged, meanwhile, the cost for replacing the lining is lower than that for replacing the cylinder body, and the service life is prolonged. The lining is low in price, convenient to replace after deformation, low in maintenance cost and small in workload.

Description

Technical Field

[0001] The utility model belongs to the technical field of cylinder bodies, and more specifically relates to a roller bending cylinder. Background Art

[0002] Modern strip mills use hydraulic roll bending technology to control the convexity and straightness of the strip. The roll bending cylinder is the main component in the hydraulic roll bending system and is used to provide adjustable roll bending force to the strip mill.

[0003] The existing bending roller cylinder is composed of a cylinder body, a piston, a rod body, a sealing ring, a guide belt and a dust ring. The piston and the rod body are an integrated structure, and are tempered as a whole. The surface of the rod body is electroplated, and a guide belt and a sealing ring are installed on the piston. The piston is installed in the inner hole of the cylinder body. The guide belt and the seal on the piston are directly in contact with the inner side of the cylinder body. The guide belt and the sealing ring are installed in the inner hole of the pressure cover. The pressure cover is installed to one end of the cylinder body, and the guide belt and the sealing ring on the pressure cover are directly in contact with the piston rod.

[0004] Since the guide belt and sealing ring of the piston of the existing bending roll cylinder are in direct contact with the inner side of the cylinder body of the bending roll cylinder, the impact force on the piston will directly act on the inner side of the cylinder body during rolling of the plate and strip rolling mill, which can easily cause elliptical deformation of the inner side of the cylinder body. Since it is difficult and expensive to repair the inner side of the cylinder body, the cylinder body with deformed inner side can only be scrapped and replaced with a new one. However, replacing a new cylinder body also has the disadvantages of high cost, large workload and long downtime. Utility Model Content

[0005] The purpose of the utility model is to provide a roll bending cylinder in view of the deficiencies in the existing technology, so as to solve the problem proposed in the above background technology that the guide belt and the sealing ring of the piston part of the existing roll bending cylinder are in direct contact with the inner side surface of the cylinder body of the roll bending cylinder, which will directly cause impact on the inner side surface of the cylinder body. Once the inner side surface of the cylinder body is deformed, it is difficult to repair and the cost of repair and replacement is high.

[0006] In order to achieve the above object, the utility model provides a roll bending cylinder, which includes:

[0007] Cylinder body;

[0008] A bushing, the outer side of which is connected to the inner side of the cylinder body;

[0009] A piston, the outer side of the piston being slidably connected to the inner side of the bushing;

[0010] A rod body, one end of which is connected to one end of the piston, and the rod body passes through one end of the cylinder body.

[0011] Preferably, the roller bending cylinder further comprises a pressure cover, a through hole is provided inside the pressure cover, the outer side surface of the pressure cover is connected to the inner side surface of one end of the cylinder body, the rod body passes through the through hole and is slidably connected to the inner side surface of the through hole.

[0012] Preferably, a first copper alloy layer is provided on the outer side surface of the piston, and the outer side surface of the first copper alloy layer is slidably connected to the inner side surface of the bushing.

[0013] Preferably, a second copper alloy layer is provided on the inner side surface of the through hole, and the inner side surface of the second copper alloy layer is slidably connected to the outer side surface of the rod body.

[0014] Preferably, a laser strengthening layer is provided on the outer side surface of the rod body, and the outer side surface of the laser strengthening layer is slidably connected to the inner side surface of the second copper alloy layer.

[0015] Preferably, at least one annular first groove is provided on the outer side surface of the bushing, and a first sealing ring is sleeved in the first groove.

[0016] Preferably, at least one annular second groove is provided on the outer side surface of the piston, and a second sealing ring is sleeved in the second groove.

[0017] Preferably, at least one annular third groove is provided on the outer side surface of the gland, and a third sealing ring is sleeved in the third groove.

[0018] Preferably, at least one annular fourth groove is provided on the inner side surface of the gland, and a fourth sealing ring is sleeved in the fourth groove.

[0019] Preferably, at least one annular fifth groove is provided on the inner side surface of the gland, and a dust ring is sleeved in the fifth groove.

[0020] The utility model provides a roller bending cylinder, which has the beneficial effects of: a sleeve is arranged between the inner side surface of the cylinder body and the outer side surface of the piston in the roller bending cylinder, and the impact force of the piston will directly act on the sleeve, thereby avoiding the impact of the piston directly acting on the inner side surface of the cylinder body, reducing or avoiding the deformation of the inner side surface of the cylinder body, and extending the life of the cylinder body. At the same time, the cost of replacing the sleeve is lower than that of replacing the cylinder body, the price of the sleeve itself is relatively low, it is convenient to replace after deformation, the maintenance cost is low, and the workload is also relatively small.

[0021] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0023] Figure 1 A schematic diagram of the structure of a roller bending cylinder in a front view and a cross-sectional view according to an embodiment of the utility model is shown;

[0024] Figure 2 A schematic diagram of the front view and cross-sectional view of the piston and rod body of a roll bending cylinder according to an embodiment of the utility model is shown;

[0025] Figure 3 The diagram shows a front view and a cross-sectional structure diagram of a pressure cover of a roller bending cylinder according to an embodiment of the utility model.

[0026] Description of reference numerals:

[0027] 1. Cylinder body; 2. Bushing; 3. Piston; 4. Rod body; 5. Gland; 6. First copper alloy layer; 7. Second copper alloy layer; 8. Laser strengthening layer; 9. First sealing ring; 10. Second sealing ring; 11. Third sealing ring; 12. Fourth sealing ring; 13. Dust ring. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0029] like Figure 1-Figure 3 As shown, the utility model provides a roller bending cylinder, which includes:

[0030] Cylinder 1;

[0031] A bushing 2, the outer side of the bushing 2 is connected to the inner side of the cylinder body 1;

[0032] A piston 3, the outer side of the piston 3 is slidably connected to the inner side of the bushing 2;

[0033] A rod body 4 , one end of which is connected to one end of the piston 3 , and the rod body 4 passes through one end of the cylinder body 1 .

[0034] Specifically, in order to solve the problem that the guide belt and sealing ring of the piston part of the existing bending roller cylinder are in direct contact with the inner side surface of the cylinder body of the bending roller cylinder, which will directly impact the inner side surface of the cylinder body, once the inner side surface of the cylinder body is deformed, it is difficult to repair and the cost of repair and replacement is high, the utility model provides a bending roller cylinder, which is provided with a bushing 2 between the inner side surface of the cylinder body 1 and the outer side surface of the piston 3. The impact force of the piston 3 will directly act on the bushing 2, so that the impact of the piston 3 is avoided to directly act on the inner side surface of the cylinder body 1, reducing or avoiding the deformation of the inner side surface of the cylinder body 1 and extending the life of the cylinder body 1. The bushing 2 replaces the cylinder body 1 to bear the impact force of the piston 3. After a period of use, the inner side surface of the bushing 2 will be deformed and needs to be replaced. Since the bushing 2 is light in weight and simple in structure, the cost of replacing the bushing 2 is low, maintenance is convenient, and the workload is small.

[0035] Preferably, the roller bending cylinder further comprises a pressure cover 5, a through hole is provided inside the pressure cover 5, the outer side surface of the pressure cover 5 is connected to the inner side surface of one end of the cylinder body 1, the rod body 4 passes through the through hole and is slidably connected to the inner side surface of the through hole.

[0036] Preferably, a first copper alloy layer 6 is provided on the outer side surface of the piston 3 , and the outer side surface of the first copper alloy layer 6 is slidably connected to the inner side surface of the bushing 2 .

[0037] Specifically, in order to solve the problem of installing a guide belt on the piston of the existing bending roller cylinder, the guide belt installed on the piston plays a guiding and supporting role and contacts the inner side of the cylinder body. Since the width of the guide belt is small, the contact area between the guide belt and the inner side of the cylinder body will be small. During impact, the pressure exerted by the guide belt on the cylinder body is large, and the cylinder body will produce elliptical deformation after about 8 months of use. In the present application, a first copper alloy layer 6 is welded on the outer side of the piston 3 to replace the guide belt. The first copper alloy layer 6 plays a guiding and supporting role, which increases the guiding support area and strength. The first copper alloy layer 6 of this structure has a large surface area in contact with the bushing 2. The pressure of the interaction between the piston 3 and the bushing 2 is small under the same impact force, which reduces the deformation of the bushing 2 and the piston 3 and extends the service life of the bushing 2 and the piston 3.

[0038] Preferably, a second copper alloy layer 7 is provided on the inner side surface of the through hole, and the inner side surface of the second copper alloy layer 7 is slidably connected to the outer side surface of the rod body 4 .

[0039] Specifically, in order to solve the problem that the guide belt is installed on the inner side of the pressure cover of the existing bending roller cylinder, the guide belt installed on the pressure cover is in direct contact with the rod body. Since the guide belt is small in width, the contact area between the guide belt and the rod body will be small. During impact, the pressure exerted by the guide belt on the rod body is strong, and the rod body will produce bamboo-like deformation after 6 months of use. In this application, a second copper alloy layer 7 is welded on the inner side of the through hole of the pressure cover 5 to replace the guide belt. The second copper alloy layer 7 plays a guiding and supporting role, thereby increasing the guiding support area and strength. The second copper alloy layer 7 of this structure has a large contact surface area with the rod body 4, and the pressure exerted on the surface of the rod body 4 by the same impact force is small, thereby reducing the deformation of the rod body 4 and the pressure cover 5, and extending the life of the rod body 4 and the pressure cover 5.

[0040] Preferably, a laser strengthening layer 8 is provided on the outer side of the rod body 4 , and the outer side of the laser strengthening layer 8 is slidably connected to the inner side of the second copper alloy layer 7 .

[0041] Specifically, in order to solve the problem that the existing bending roller cylinder has an overall tempering treatment on the rod body, the surface electroplating layer is only 0.03-0.05mmm, the high hardness layer with a hardness HRC greater than 55 is thin, and the deformation of the rod body after impact is large, the present application performs laser strengthening on the outer side of the rod body 4 to form a laser strengthening layer 8. The thickness of the laser strengthening layer 8 is ≥0.75mm, and the hardness HRC ≥55. The laser strengthening layer 8 uses corrosion-resistant materials. The thickness of the high hardness layer in the rod body 4 will be increased, the impact resistance is increased, the rod body 4 is not easy to deform, and the service life of the rod body 4 is extended.

[0042] Preferably, at least one annular first groove is provided on the outer side surface of the bushing 2, and a first sealing ring 9 is sleeved in the first groove.

[0043] Specifically, the first sealing ring 9 can prevent the oil paths of the rod chamber and the rodless chamber in the cylinder body 1 from communicating with each other.

[0044] Preferably, at least one annular second groove is provided on the outer side surface of the piston 3, and a second sealing ring 10 is sleeved in the second groove.

[0045] Specifically, the second sealing ring 10 can prevent the oil passages of the rod chamber and the rodless chamber in the cylinder body 1 from communicating with each other.

[0046] Preferably, at least one annular third groove is provided on the outer side surface of the gland 5, and a third sealing ring 11 is sleeved in the third groove.

[0047] Specifically, the third sealing ring 11 can prevent the rod chamber in the cylinder body 1 from communicating with the outside.

[0048] Preferably, at least one annular fourth groove is provided on the inner side surface of the gland 5, and a fourth sealing ring 12 is sleeved in the fourth groove.

[0049] Specifically, the fourth sealing ring 11 can prevent the rod chamber in the cylinder body 1 from communicating with the outside.

[0050] Preferably, at least one annular fifth groove is provided on the inner side surface of the gland 5, and a dust ring 13 is sleeved in the fifth groove.

[0051] Specifically, the dustproof ring 13 can prevent dust from entering the through hole.

[0052] In summary, the original bending roller cylinder has no bushing on the inner side of the cylinder body, and the impact force of the piston acts directly on the cylinder body. After the inner side of the cylinder body is deformed, it cannot be repaired and the bending roller cylinder body can only be replaced. The cost of replacing the cylinder body is high and the workload is large. The present application adds a bushing 2 to the inner side of the cylinder body 1, and the impact force of the piston 3 acts on the bushing 2, which reduces or avoids deformation of the inner side of the cylinder body 1 and extends the service life of the cylinder body 1. The bushing 2 is easy to replace after deformation, and the maintenance cost is low.

[0053] Two guide belts are installed on the original piston, with a total width of 30 mm. The contact area between the guide belt and the inner side surface of the bushing is small, the pressure exerted by the impact force on the inner side surface of the bushing is large, and the inner side surface is easily deformed; the first copper alloy layer 6 is completely welded on the piston 3 of the present application, with a total width of 58.5 mm. The contact area between the first copper alloy layer 6 and the inner side surface of the bushing 2 is large, the pressure exerted by the impact force on the inner side surface of the bushing 2 is small, and the inner side surface of the bushing 2 is not easily deformed.

[0054] Two guide belts are installed on the inner side of the original pressure cover, with a total width of 20mm. The contact area between the guide belt and the outer side of the rod body is small, the pressure of the impact force on the rod body is large, and the rod body is easily deformed; in the present application, the second copper alloy layer 7 is completely welded on the inner side of the through hole of the pressure cover, with a total width of 50mm. The contact area between the second copper alloy layer 7 and the rod body 4 is large, the pressure of the impact force on the rod body 4 is small, and the rod body 4 is not easily deformed.

[0055] The original rod body is subjected to overall tempering treatment, and the surface of the rod body is chrome-plated with a chrome plating thickness of 0.03-0.05mm. The high hardness layer is relatively thin, and the rod body is easily deformed after impact. The outer side surface of the rod body 4 of the present application is laser strengthened to form a laser strengthened layer 8. The thickness of the laser strengthened layer 8 is ≥0.75mm, and the hardness HRC is ≥55. The thickness of the high hardness layer in the rod body 4 will be increased, thereby improving the impact resistance and extending the life of the rod body 4.

[0056] The original piston and gland use guide belts for support and guidance, and the guide belts have low compressive strength and poor wear resistance. In the present application, a copper alloy layer is welded on the outer side surface of the piston 3 and the inner side surface of the through hole of the gland 5. The copper alloy layer has the advantages of high compressive strength and good wear resistance, which improves the supporting and guiding function, extends the service life of the rod body 4 and the gland 5, and the bending roller cylinder is not prone to leakage, and improves the accuracy of the bending roller cylinder.

[0057] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A roller bending cylinder, characterized in that: The roll bending cylinder includes: Cylinder body; A bushing, the outer side of which is connected to the inner side of the cylinder body; A piston, the outer side of the piston being slidably connected to the inner side of the bushing; A rod body, one end of which is connected to one end of the piston, and the rod body passes through one end of the cylinder body.

2. A roll bending cylinder according to claim 1, characterized in that: The roller bending cylinder also includes a pressure cover, a through hole is provided inside the pressure cover, the outer side surface of the pressure cover is connected to the inner side surface of one end of the cylinder body, the rod body passes through the through hole and is slidably connected to the inner side surface of the through hole.

3. A roll bending cylinder according to claim 1, characterized in that: A first copper alloy layer is provided on the outer side surface of the piston, and the outer side surface of the first copper alloy layer is slidably connected to the inner side surface of the bushing.

4. A roll bending cylinder according to claim 2, characterized in that: The inner side surface of the through hole is provided with a second copper alloy layer, and the inner side surface of the second copper alloy layer is slidably connected to the outer side surface of the rod body.

5. A roll bending cylinder according to claim 4, characterized in that: A laser strengthening layer is provided on the outer side of the rod body, and the outer side of the laser strengthening layer is slidably connected to the inner side of the second copper alloy layer.

6. A roll bending cylinder according to claim 1, characterized in that: The outer side surface of the bushing is provided with at least one annular first groove, and a first sealing ring is sleeved in the first groove.

7. A roll bending cylinder according to claim 1, characterized in that: The outer side surface of the piston is provided with at least one annular second groove, and a second sealing ring is sleeved in the second groove.

8. A roll bending cylinder according to claim 2, characterized in that: At least one annular third groove is disposed on the outer side surface of the gland, and a third sealing ring is sleeved in the third groove.

9. A roll bending cylinder according to claim 2, characterized in that: The inner side surface of the gland is provided with at least one annular fourth groove, and a fourth sealing ring is sleeved in the fourth groove.

10. A roll bending cylinder according to claim 2, characterized in that: The inner side surface of the gland is provided with at least one annular fifth groove, and a dust ring is sleeved in the fifth groove.

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