Hydraulic stretching device

Abstract

The utility model discloses a hydraulic stretching device which comprises a supporting ring seat, a hydraulic stretching device and a hydraulic stretching device. The lower end of the piston column is embedded in the limiting ring groove; the piston cylinder is arranged on the upper end face of the supporting ring seat, a containing ring groove is formed in the lower end face of the piston cylinder, the upper end of the piston column is arranged in the containing ring groove in a sliding mode, an oil cavity is formed between the upper end face of the piston column and the groove bottom of the containing ring groove, an oil way penetrating through the piston cylinder is formed in the piston cylinder, and the oil way is communicated with the oil cavity; the stretching chuck is placed on the upper end face of the piston cylinder and comprises two oppositely-arranged clamping plates and a pulling piece, vertical through grooves are formed in the opposite sides of the two clamping plates respectively, the groove walls of the through grooves are in an arc shape, the through grooves of the two clamping plates define a clamping space, anti-skid lines are formed on the groove walls of the through grooves, and the anti-skid lines are meshed with threads of the bolt. The bolt hydraulic tensioner solves the problem that a traditional bolt hydraulic tensioner can only be used for fastening bolts with one diameter in a matched mode.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt tensioning equipment, in particular to a hydraulic tensioning device. Background Art

[0002] Hydraulic tensioners are generally used to tighten anchor bolts during the installation of mechanical equipment. Under the action of the hydraulic tensioner, the bolts are stretched in their elastic deformation zone, and the slight change in the bolt diameter causes the nut to loosen, making it easier to tighten. However, corresponding tensioners are required for tightening anchor bolts of different diameters. During the installation of metallurgical equipment, most production line equipment uses anchor bolts of different diameters. If tensioners for bolts of various diameters are fully prepared, the procurement cost is high, the maintenance cost is high, and the interchangeability of equipment from different manufacturers is poor. The conversion between the hydraulic pump pressure and the tightening force of tensioners of different specifications from different manufacturers is inconsistent, which is extremely unfavorable for on-site use.

[0003] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0004] In order to overcome the defects of the prior art, a hydraulic tensioning device is now provided to solve the problem that the traditional hydraulic bolt tensioner can only be used to tighten bolts of one diameter.

[0005] In order to achieve the above object, a hydraulic stretching device is provided, comprising:

[0006] A support ring seat for movably sleeved the outer part of the nut, wherein the upper end surface of the support ring seat is formed with a limiting ring groove;

[0007] A piston column, the lower end of which is embedded in the limiting ring groove;

[0008] A piston cylinder is arranged on the upper end surface of the support ring seat, a containing ring groove is formed on the lower end surface of the piston cylinder, the upper end of the piston column is slidably arranged in the containing ring groove, an oil cavity is formed between the upper end surface of the piston column and the groove bottom of the containing ring groove, an oil path penetrating the piston cylinder is formed in the piston cylinder, and the oil path is connected to the oil cavity;

[0009] The stretching chuck placed on the upper end surface of the piston cylinder includes two clamping plates and a tensioning piece arranged opposite to each other. The opposite sides of the two clamping plates are respectively formed with vertically arranged through grooves, and the groove walls of the through grooves are arc-shaped. The through grooves of the two clamping plates enclose a clamping space for embedding the bolts to be tightened, and the groove walls of the through grooves are formed with anti-slip patterns, which engage with the threads of the bolts.

[0010] Furthermore, it also includes a cylinder sleeve, which can be movably mounted on the outside of the piston cylinder and the support ring seat, the outer wall of the piston cylinder is formed with a slide groove, the upper and lower ends of the cylinder sleeve are respectively formed with flanges facing the inner side of the cylinder sleeve, the flange of the lower end of the cylinder sleeve is connected to the outer wall of the support ring seat, and the flange of the upper end of the cylinder sleeve is slid in the slide groove.

[0011] Furthermore, the slide groove is arranged in a circle along the circumferential direction of the piston cylinder.

[0012] Furthermore, a support plate is connected between the bottom of the flange at the lower end of the cylinder sleeve and the outer side wall of the support ring seat.

[0013] Furthermore, the lower portion of the clamping plate is extended to form an extension portion extending into the inner annular hole of the piston cylinder.

[0014] Furthermore, the size of the inner annular hole of the piston cylinder gradually increases from bottom to top, and the thickness of the extension portion gradually increases from bottom to top.

[0015] The beneficial effect of the utility model is that the hydraulic tensioning device of the utility model is used for pre-tightening or disassembling of bolts. Through the tensioning chuck, bolts of various diameters and specifications can be constructed, and it is not necessary to equip all types of tensioning chucks, thereby reducing the construction cost. In addition, when disassembling the bolt, it is only necessary to clamp the bolt with the tensioning chuck to remove it, so whether the bolt is rusty or not, it is very convenient to disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0017] Figure 1 It is a schematic structural diagram of a hydraulic stretching device according to an embodiment of the utility model.

[0018] Figure 2 It is a schematic structural diagram of a stretching chuck according to an embodiment of the utility model.

[0019] Figure 3 It is a top view of the stretching chuck according to an embodiment of the utility model.

[0020] Figure 4 This is a schematic diagram of the hydraulic stretching device in use according to an embodiment of the utility model. DETAILED DESCRIPTION

[0021] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] Reference Figures 1 to 4 As shown, the utility model provides a hydraulic stretching device, comprising: a support ring seat 1, a piston column 2, a piston cylinder 3, and a stretching chuck 4.

[0024] In this embodiment, the support ring seat 1 is in the shape of a circular ring. The support ring seat is used to movably cover the outside of the nut 6. The size of the inner ring hole of the support ring seat 1 is larger than the outer diameter of the nut. A limiting ring groove is formed on the upper end surface of the support ring seat 1.

[0025] The piston column 2 is annular in shape. The lower end of the piston column 2 is embedded in the limiting ring groove. The thickness of the piston column is adapted to the notch width of the limiting ring groove.

[0026] The piston cylinder 3 is movably arranged on the upper end surface of the support ring seat 1. The piston cylinder is in a circular ring shape. The thickness of the piston cylinder is greater than the thickness of the piston column. The lower end surface of the piston cylinder 3 is formed with an accommodating ring groove. The upper end of the piston column 2 is slidably arranged in the accommodating ring groove. The thickness of the piston column is adapted to the groove width of the accommodating ring groove. An oil cavity is formed between the upper end surface of the piston column 2 and the groove bottom of the accommodating ring groove. An oil path a is formed in the piston cylinder 3 and runs through the piston cylinder 3. The oil path is connected to the oil cavity.

[0027] The tensioning clamp 4 is placed on the upper end surface of the piston cylinder 3. The tensioning clamp 4 includes two clamping plates 41 and an anchor 42.

[0028] Specifically, the two clamping plates 41 are arranged opposite to each other. Vertically arranged through grooves are formed on opposite sides of the two clamping plates 41. The groove wall of the through groove is arc-shaped. The through grooves of the two clamping plates 41 enclose a clamping space for the bolt 7 to be fastened to be embedded. The groove wall of the through groove is formed with anti-skid lines. The anti-skid lines are engaged with the threads of the bolt 7.

[0029] As a preferred embodiment, threaded holes are provided at both ends of the clamping plates. The anchoring member is a screw rod. The screw rod is screwed into the threaded holes at one end of the two clamping plates, so that the anti-slip pattern is engaged with the thread of the bolt.

[0030] In some embodiments, the outer ring surface and the inner ring surface of the piston column are respectively provided with sealing rings, so that the oil chamber forms a sealed cavity. High-pressure oil is input into the oil circuit, and the high-pressure oil is filled in the oil chamber. As the amount of oil in the oil chamber increases, the piston cylinder is lifted up, and then the stretching chuck is lifted, and the stretching chuck stretches the bolt. After the bolt is stretched, the nut is turned to tighten the nut.

[0031] The hydraulic stretching device in this embodiment further comprises a cylinder sleeve 5. The cylinder sleeve 5 is movably sleeved on the outside of the piston cylinder 3 and the support ring seat 1. The cylinder sleeve can slide in the vertical direction. The inner diameter of the cylinder sleeve is adapted to the outer diameter of the piston cylinder.

[0032] The outer wall of the piston cylinder 3 is formed with a slide groove b. The upper and lower ends of the cylinder sleeve 5 are respectively formed with flanges facing the inner side of the cylinder sleeve 5. The flange at the lower end of the cylinder sleeve 5 is connected to the outer wall of the support ring seat 1. The flange at the upper end of the cylinder sleeve 5 is slidably arranged in the slide groove. The cylinder sleeve is used to prevent the piston cylinder from slipping due to excessive pressure inside the oil chamber.

[0033] As a preferred embodiment, the slide groove is arranged in a circle along the circumferential direction of the piston cylinder 3. The flange of the cylinder sleeve is arranged in a circle along the circumferential direction of the cylinder sleeve.

[0034] A support plate 11 is connected between the bottom of the flange at the lower end of the cylinder sleeve 5 and the outer side wall of the support ring seat 1. There are multiple support plates, which are arranged at intervals along the circumferential direction of the support ring seat.

[0035] In this embodiment, a plurality of support plates are arranged at equal intervals along the circumferential direction of the support ring seat. A notch is formed at the bottom of the support ring seat. Through the notch, after the tensioning chuck stretches the bolt, the nut is rotated through the notch to tighten the nut.

[0036] See also Figure 2 and Figure 3 As shown, the lower portion of the clamping plate 41 is extended to form an extension portion 411 extending into the inner ring hole of the piston cylinder 3 .

[0037] As a preferred implementation, the size of the inner annular hole of the piston cylinder 3 gradually increases from bottom to top, and the thickness of the extension portion 411 gradually increases from bottom to top.

[0038] The hydraulic tensioning device of the utility model is used for pre-tightening or disassembling bolts. Through the tensioning chuck, bolts of various diameters and specifications can be constructed, and it is not necessary to equip all types of tensioning chucks, thereby reducing the construction cost. In addition, when disassembling the bolt, it is only necessary to clamp the bolt with the tensioning chuck to remove it, so whether the bolt is rusty or not (whether the thread is clear or not), it is very convenient to disassemble.

[0039] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A hydraulic stretching device, characterized in that: include: A support ring seat for movably sleeved the outer part of the nut, wherein the upper end surface of the support ring seat is formed with a limiting ring groove; A piston column, the lower end of which is embedded in the limiting ring groove; A piston cylinder is arranged on the upper end surface of the support ring seat, a containing ring groove is formed on the lower end surface of the piston cylinder, the upper end of the piston column is slidably arranged in the containing ring groove, an oil cavity is formed between the upper end surface of the piston column and the groove bottom of the containing ring groove, an oil path penetrating the piston cylinder is formed in the piston cylinder, and the oil path is connected to the oil cavity; The stretching chuck placed on the upper end surface of the piston cylinder includes two clamping plates and a tensioning piece arranged opposite to each other. The opposite sides of the two clamping plates are respectively formed with vertically arranged through grooves, and the groove walls of the through grooves are arc-shaped. The through grooves of the two clamping plates enclose a clamping space for embedding the bolts to be tightened, and the groove walls of the through grooves are formed with anti-slip patterns, which engage with the threads of the bolts.

2. The hydraulic stretching device according to claim 1, characterized in that: It also includes a cylinder sleeve, which can be movably mounted on the outside of the piston cylinder and the support ring seat, the outer wall of the piston cylinder is formed with a slide groove, the upper and lower ends of the cylinder sleeve are respectively formed with flanges facing the inner side of the cylinder sleeve, the flange of the lower end of the cylinder sleeve is connected to the outer wall of the support ring seat, and the flange of the upper end of the cylinder sleeve is slid in the slide groove.

3. The hydraulic stretching device according to claim 2, characterized in that: The slide groove is arranged in a circle along the circumferential direction of the piston cylinder.

4. The hydraulic stretching device according to claim 1, characterized in that: A support plate is connected between the bottom of the flange at the lower end of the cylinder sleeve and the outer side wall of the support ring seat.

5. The hydraulic stretching device according to claim 1, characterized in that: The lower portion of the clamping plate is extended to form an extension portion extending into the inner ring hole of the piston cylinder.

6. The hydraulic stretching device according to claim 5, characterized in that: The size of the inner ring hole of the piston cylinder gradually increases from bottom to top, and the thickness of the extension portion gradually increases from bottom to top.

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