Balance cylinder and roll bending cylinder

Abstract

The utility model discloses a balance cylinder, which comprises a cylinder body, a piston, a piston rod, a piston rod, a piston rod, a piston rod, a piston rod, a piston rod, a piston rod and a piston rod, the wear-resistant sleeve is arranged in the cylinder cavity, and the wear-resistant sleeve can be replaced; the piston is arranged in the wear-resistant sleeve in a sliding mode, the piston abuts against the inner side wall of the wear-resistant sleeve, and the piston is connected with a piston rod; and the cylinder cover is detachably connected to an opening of the cylinder cavity, the wear-resistant sleeve can be fixed in the cylinder cavity through the cylinder cover, and the cylinder cover is provided with a through hole allowing the piston rod to penetrate through. The utility model further discloses a roll bending cylinder. The roll bending cylinder also adopts the split design of the cylinder body and the wear-resistant sleeve. According to the balance cylinder, a traditional cylinder body is made into a split structure of the cylinder body and the wear-resistant sleeve, and when the wear-resistant sleeve is worn, the wear-resistant sleeve can be easily taken out and replaced, so that the downtime required for repairing the worn cylinder body is greatly shortened, and the repairing and production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic equipment, in particular to a balancing cylinder and a bending roller cylinder. Background Art

[0002] During the use of the bending roll cylinder, the cylinder cavity and piston rod of the cylinder body are worn due to frequent reciprocating motion. When the cylinder cavity and piston rod of the cylinder body are worn to a certain extent, it will cause oil leakage from the cylinder body and the bending roll effect will deteriorate, and the cylinder body and piston rod need to be repaired or replaced. Whether repairing or replacing the cylinder body, the cylinder body needs to be disassembled from the rolling mill frame, which is very troublesome and time-consuming. Utility Model Content

[0003] In order to overcome the defects in the prior art, the utility model provides a balancing cylinder and a bending roller cylinder. The utility model makes the traditional cylinder body into a structure in which the cylinder body and the wear-resistant sleeve are separated. When the wear-resistant sleeve is worn, the wear-resistant sleeve can be easily taken out and replaced, which greatly reduces the downtime required for repairing the cylinder body wear and reduces the repair and production costs.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a balancing cylinder, comprising:

[0005] A cylinder body, one end of which has an opening, and a cylinder cavity is formed by extending along the opening into the cylinder body;

[0006] A wear-resistant sleeve, the wear-resistant sleeve is arranged in the cylinder cavity, and the wear-resistant sleeve is replaceable;

[0007] A piston, wherein the piston is slidably disposed in the wear-resistant sleeve, and the piston abuts against an inner side wall of the wear-resistant sleeve, and the piston is connected to a piston rod;

[0008] A cylinder cover is detachably connected to the opening of the cylinder cavity, the cylinder cover can fix the wear-resistant sleeve in the cylinder cavity, and the cylinder cover has a through hole for the piston rod to pass through.

[0009] Through the above technical solution, during the operation of the piston cylinder, the piston does not contact the cylinder body, but rubs against the wear-resistant sleeve. When the wear-resistant sleeve is worn, the piston sleeve can be taken out and replaced by simply removing the cylinder head, which reduces the maintenance time required when the piston cylinder is worn and improves work efficiency.

[0010] Furthermore, the wear-resistant sleeve is made of copper alloy and is surface hardened. A first groove is provided along the circumferential direction of the outer side of the wear-resistant sleeve, and a first sealing ring is provided in the first groove.

[0011] Furthermore, the wear-resistant sleeve and the cylinder cavity are clearance-matched to ensure that the wear-resistant sleeve can smoothly enter the cylinder cavity.

[0012] Furthermore, the diameter of the opening is larger than the diameter of the cylinder cavity. A sufficiently large opening facilitates the installation of the cylinder cover and also facilitates the cylinder cover to press against the wear-resistant sleeve and fix the wear-resistant sleeve in the cylinder cavity.

[0013] Furthermore, at least three third grooves are provided along the inner circumferential direction of the cylinder head, two of which are used to set dust rings and guide rings respectively, and the remaining third grooves are used to set third sealing rings, and a fourth groove is provided along the outer circumferential direction of the cylinder head, and a fourth sealing ring is provided in the fourth groove. This ensures that the piston does not leak, wherein the dust ring is used to prevent dust, dirt, sand and impurities from entering the cylinder cavity, and the guide ring plays a supporting and guiding role to prevent the piston rod and the radial force inside the cylinder head from wearing the piston rod or the cylinder head.

[0014] Furthermore, the cylinder head is provided with a connecting hole, the cylinder body is provided with a threaded hole matching the connecting hole, bolts are passed through the connecting hole and the threaded hole, so as to connect the cylinder head to the cylinder body, and the cylinder head and the wear-resistant sleeve are abutted against each other.

[0015] Furthermore, the piston and the piston rod are manufactured integrally, a second groove is provided along the circumferential direction of the piston, and a second sealing ring is provided in the second groove.

[0016] A roller bending cylinder comprises the above-mentioned balancing cylinder, wherein the cylinder cavity passes through the cylinder body, at least one end of the cylinder cavity forms the opening on the surface of the cylinder body, the opening is detachably connected to the cylinder cover, the piston rod is passed through the through hole of the cylinder cover, and the part of the piston rod located in the cylinder cavity is connected to the piston.

[0017] Furthermore, two openings are formed on the surface of the cylinder body at both ends of the cylinder cavity, two pistons are arranged at intervals in the cylinder cavity, each piston is connected to a piston rod, and the two piston rods respectively pass through the through holes of the two cylinder covers.

[0018] Furthermore, at least three third grooves are provided along the inner circumferential direction of each cylinder head, wherein two of the third grooves are respectively used to set a dust ring and a guide ring, and the remaining third grooves are used to set a third sealing ring. A fourth groove is provided along the outer circumferential direction of each cylinder head, and a fourth sealing ring is provided in the fourth groove.

[0019] By means of the above technical solution, the beneficial effects of the utility model are as follows:

[0020] 1. In the present application, a wear-resistant sleeve is arranged in the cylinder cavity, and the piston rod is placed in the wear-resistant sleeve. When the piston rod is in operation, the piston rod only rubs against the wear-resistant sleeve. If the wear-resistant sleeve is worn, it can be continued to be used by simply replacing the wear-resistant sleeve. The time required for replacing the wear-resistant sleeve is much shorter than that for repairing the inner wall of the cylinder cavity in the traditional way, which greatly reduces the downtime required for maintenance and improves production efficiency.

[0021] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the overall structure of the balancing cylinder in the embodiment of the utility model;

[0024] Figure 2 is a cross-sectional view of a cylinder head in an embodiment of the utility model;

[0025] Figure 3 It is a schematic diagram of the overall structure of the bending roller cylinder in the embodiment of the utility model.

[0026] The figure numbers of the above drawings are: 1. cylinder body; 2. wear-resistant sleeve; 21. first sealing ring; 3. piston rod; 31. piston; 311. second sealing ring; 4. cylinder head; 41. dust ring; 42. third sealing ring; 43. guide sleeve; 44. fourth sealing ring; 45. abutment; 46. pressing portion; 47. connecting portion; 48. connecting hole. DETAILED DESCRIPTION

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

[0028] It should be noted that in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0029] Example: Combination Figure 1-3 As shown, embodiment 1 discloses a balancing cylinder, comprising:

[0030] The cylinder body 1 has a cylindrical opening at one end, and a cylindrical cylinder cavity is formed along the opening and extends into the cylinder body, and the inner diameter of the opening is slightly larger than the cylinder cavity. Two threaded holes are symmetrically arranged on the wall where the opening and the cylinder cavity meet and on both sides of the cylinder cavity.

[0031] A barrel-shaped wear-resistant sleeve 2 is arranged in the cylinder cavity of the cylinder body 1, and the wear-resistant sleeve 2 is made of copper alloy and surface hardened. The outer diameter of the wear-resistant sleeve 2 is equal to the inner diameter of the cylinder cavity, so that the wear-resistant sleeve 2 can just be placed in the cylinder cavity, and the outer wall of the wear-resistant sleeve 2 is in full contact with the inner wall of the cylinder cavity of the cylinder body 1, and the cylinder cavity is used to avoid providing sufficient supporting force for the wear-resistant sleeve 2, so as to avoid the piston rod 3 from deforming the wear-resistant sleeve 2 when the piston cylinder is running. In this embodiment, two grooves are arranged at intervals along the circumferential direction of the outer side of the wear-resistant sleeve 2, and the first sealing ring 21 is arranged in the groove. Among them, the two grooves are respectively close to the two ends of the wear-resistant sleeve 2. It should be noted that the length of the wear-resistant sleeve 2 is slightly smaller than the cylinder cavity.

[0032] The piston rod 3 is arranged in the wear-resistant sleeve 2, and the outer diameter of the piston rod 3 is smaller than the inner diameter of the wear-resistant sleeve 2. The piston rod 3 is provided with a piston 31, and the piston 31 abuts against the inner side wall of the wear-resistant sleeve 2, and the piston rod 3 can slide back and forth in the wear-resistant sleeve 2 with the piston 31. Two grooves arranged at intervals are arranged along the circumferential direction of the piston 31, and the second sealing ring 311 is arranged in the grooves. The two grooves are respectively close to the two ends of the piston 31.

[0033] The opening of the cylinder body 1 is used to connect the cylinder head 4. The cylinder head 4 has a through hole for the piston rod 3 to pass through and slide along the length direction of the piston rod 3. The inner diameter of the through hole is equal to the outer diameter of the piston rod 3. Since the outer diameter of the piston 31 is larger than the outer diameter of the piston rod 3, the cylinder head 4 can limit the sliding range of the piston rod 3. Three grooves are provided on the inner side of the through hole of the cylinder head 4 and along its circumferential direction. The three grooves are used to set the dust ring 41, the third sealing ring 42 and the guide sleeve 43 from the outside to the inside. The dust ring 41 can prevent dust, dirt, sand and impurities from entering the cylinder cavity. The guide ring 42 plays a supporting and guiding role to prevent the radial force of the inner side wall of the through hole of the piston rod 3 and the cylinder head 4 from wearing the piston rod 3 or the cylinder head 4. Thereby extending the service life of the piston cylinder. It should be noted that the dust ring 41 is a continuous annular double-lip dust ring, which can be easily installed in the groove of the cylinder head 4.

[0034] The cylinder head 4 includes a butt portion 45 embedded in the wear-resistant sleeve 2, a pressing portion 46 embedded in the cylinder cavity, and a connecting portion 47 for connecting with the cylinder body 1. A groove is provided on the outer side of the butt portion of the cylinder head 4 and along its circumferential direction, and the groove is used to set a fourth sealing ring 44. The first sealing ring 21, the second sealing ring 311, the third sealing ring 42 and the fourth sealing ring 44 cooperate to ensure the airtightness of the piston cylinder as a whole.

[0035] In this embodiment, the length of the wear-resistant sleeve 2 plus the length of the pressing portion 46 of the cylinder head 4 is equal to the length of the cylinder cavity. That is, after installation, the abutting portion 45 of the cylinder head 4 is embedded in the wear-resistant sleeve 2, the pressing portion 46 of the cylinder head 4 and the end of the wear-resistant sleeve 2 are abutted, and the connecting portion 47 of the cylinder head 4 is placed in the opening and fixedly connected to the cylinder body 1 by bolts.

[0036] The cylinder head 4 is provided with a connection hole 48 that matches the threaded hole on the cylinder body 1. Bolts are passed through the connection hole 48 and the threaded hole and tightened to make the inner side of the cylinder head 4 abut against the outer end of the wear-resistant sleeve 2, thereby fixing the wear-resistant sleeve 2. If the wear-resistant sleeve 2 is worn, the wear-resistant sleeve 2 can be replaced by simply removing the cylinder head 4. The time required to replace the wear-resistant sleeve 2 is much shorter than the traditional method of repairing the inner wall of the cylinder cavity, which greatly reduces the downtime required for maintenance and improves production efficiency.

[0037] Through the above technical solution, during the operation of the piston cylinder, the piston 31 does not contact the cylinder body, but rubs against the wear-resistant sleeve 2. When the wear-resistant sleeve 2 is worn, the piston sleeve 2 can be taken out and replaced by simply removing the cylinder head 4, thereby reducing repair and production costs.

[0038] Embodiment 2 discloses a roller bending cylinder, the structure of which is similar to the above-mentioned balancing cylinder, except that: Figure 2As shown, the cylinder cavity penetrates the cylinder body 1, and two openings are formed at the two ends of the cylinder cavity on the surface of the cylinder body 1. The wear-resistant sleeve 2 is arranged in the cylinder cavity, and one piston rod 3 is inserted into each of the two openings. The two piston rods 3 can be spaced apart in the wear-resistant sleeve 2, and the two openings are detachably connected to the cylinder cover 4 to fix the wear-resistant sleeve 2 and limit the sliding distance of the two piston rods 2. It should be noted that the two piston rods 3 in this embodiment are of equal length.

[0039] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A balancing cylinder, characterized in that: include: A cylinder body, one end of which has an opening, and a cylinder cavity is formed by extending along the opening into the cylinder body; A wear-resistant sleeve, the wear-resistant sleeve is arranged in the cylinder cavity, and the wear-resistant sleeve is replaceable; A piston, wherein the piston is slidably disposed in the wear-resistant sleeve, and the piston abuts against an inner side wall of the wear-resistant sleeve, and the piston is connected to a piston rod; A cylinder cover is detachably connected to the opening of the cylinder cavity, the cylinder cover can fix the wear-resistant sleeve in the cylinder cavity, and the cylinder cover has a through hole for the piston rod to pass through.

2. The balancing cylinder according to claim 1, characterized in that: The wear-resistant sleeve is made of copper alloy, and a first groove is arranged along the circumferential direction of the outer side of the wear-resistant sleeve, and a first sealing ring is arranged in the first groove.

3. The balancing cylinder according to claim 1, characterized in that: The wear-resistant sleeve and the cylinder cavity are clearance-matched.

4. The balancing cylinder according to claim 1, characterized in that: The diameter of the opening is greater than the diameter of the cylinder cavity.

5. The balancing cylinder according to claim 1, characterized in that: At least three third grooves are provided along the inner circumferential direction of the cylinder head, two of which are used to set a dust ring and a guide ring respectively, and the remaining third grooves are used to set a third sealing ring. A fourth groove is provided along the outer circumferential direction of the cylinder head, and a fourth sealing ring is provided in the fourth groove.

6. The balancing cylinder according to claim 1, characterized in that: The cylinder head is provided with a connecting hole, the cylinder body is provided with a threaded hole matching the connecting hole, bolts are passed through the connecting hole and the threaded hole, so as to connect the cylinder head to the cylinder body, and the cylinder head and the wear-resistant sleeve are against each other.

7. The balancing cylinder according to claim 1, characterized in that: The piston and the piston rod are manufactured in one piece, a second groove is provided along the circumferential direction of the piston, and a second sealing ring is provided in the second groove.

8. A roll bending cylinder, comprising the balancing cylinder according to any one of claims 1 to 7, characterized in that: The cylinder cavity passes through the cylinder body, and at least one end of the cylinder cavity forms the opening on the surface of the cylinder body. The opening is detachably connected to the cylinder cover, and the piston rod is passed through the through hole of the cylinder cover. The piston is provided on the part of the piston rod located in the cylinder cavity.

9. The roll bending cylinder according to claim 8, characterized in that: Two openings are formed on the surface of the cylinder body at both ends of the cylinder cavity. Two pistons are arranged at intervals in the cylinder cavity. Each piston is connected to a piston rod. The two piston rods pass through the through holes of the two cylinder covers respectively.

10. The roll bending cylinder according to claim 8, characterized in that: At least three third grooves are provided along the inner circumferential direction of the cylinder head, two of which are used to set a dust ring and a guide ring respectively, and the remaining third grooves are used to set a third sealing ring. A fourth groove is provided along the outer circumferential direction of the cylinder head, and a fourth sealing ring is provided in the fourth groove.

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