CN201102228Y - Hydraulic drawing device with overload safeguard - Google Patents

Abstract

The utility model provides an hydraulic elongator with an overload protective device which comprises a nut sleeve, a support bushing, a pull rod with the nut sleeve, a hydraulic cylinder, a quick coupling, a piston, a nut, a spanner, a bolt to be drawn, a nut arranged on the bolt to be drawn and the overload protective device; the overload protective device is arranged on the piston and consists of a steel ball, a spring guiding axle, a sliding bush, a compression spring, a hexagonal socket nut; the steel ball is arranged on the front end of a piston round hole; the sliding bush and the compression spring are arranged on the spring guiding axle; the spring guiding axle is arranged in the piston round hole; the hexagonal socket nut is screwed into the piston round hole to compress the compression spring tightly and lock the spring guiding axle; when the pressure in the hydraulic cylinder exceeds the set value, the steel ball is propped up; the overpressured hydraulic oil overflows out from a pore between the sliding bush and the hexagonal socket nut to make the oil pressure down so as to realize the overload protection. The beneficial effect of the utility model is that the utility model provides the hydraulic elongator with the overload protective device which improves the reliability of the hydraulic elongator.

Description

Hydraulic tensioner with overload protection

【Technical field】

The utility model relates to a hydraulic stretching device in the technical field of mechanical design and manufacture, in particular to a hydraulic stretching device with an overload protection device.

【Background technique】

Hydraulic stretchers are mainly used for the installation of large equipment and large pressure vessels. Its working principle is that the bolt to be locked is stretched by the piston in the hydraulic tensioner, and then the nut is tightened to achieve the purpose of bolt pre-tightening. Methods.

The existing hydraulic tensioner consists of a hydraulic cylinder and other parts without an overload protection device. The oil pressure of the tensioner is provided by the oil supply pump. When using the hydraulic tensioner, if the operation error or the pressure of the oil supply pump is set If the setting is too high, the oil pressure of the hydraulic tensioner may be too high and the bolt may be broken.

【Content of utility model】

The purpose of the utility model is to overcome the deficiencies of the prior art, provide a hydraulic tensioner with an overload protection device, and improve the reliability of the hydraulic tensioner.

In order to achieve the above purpose, the utility model has a hydraulic tensioner with an overload protection device, which includes a nut sleeve, a support sleeve, a pull rod with a nut sleeve, a hydraulic cylinder, a quick connector, a piston, a nut, a wrench, a tensioned bolt, and is installed on the The nut on the stretched bolt is characterized in that it also includes an overload protection device; the stretched bolt is set at the lower end of the pull rod with a nut sleeve, and the nut is set at the upper end of the pull rod with a nut sleeve; the hydraulic cylinder is set on the support sleeve , the piston is installed in the hydraulic cylinder; the nut is in contact with the piston, and the hydraulic cylinder is connected to the high-pressure pump through a quick joint; a round hole is set on the piston, and the overload protection device is set in it; the overload protection device is guided by a steel ball and a spring Shaft, sliding sleeve, compression spring and inner hexagon nut. The steel ball is set on the upper end of the small hole on the piston. The sliding sleeve and compression spring are set on the spring guide shaft. The spring guide shaft is set in the piston hole. Use the inner hexagon nut Screw the thread into the piston hole through the inner hole of the piston hole, compress the compression spring and lock the spring guide shaft.

The working process of the present utility model is:

Install the support sleeve on the surface of the connected workpiece, install the tie rod with nut sleeve on the tensioned bolt, and tighten the nut with a wrench to make it close to the piston; start the high-pressure pump to let the high-pressure oil enter the hydraulic cylinder, and the hydraulic cylinder The pressure generated inside makes the piston move upwards, and the tensioned bolt is stretched through the pull rod with nut sleeve; the purpose of pre-tightening is realized by rotating the nut sleeve and tightening the nut installed on the tensioned bolt.

When the pressure in the hydraulic cylinder exceeds the set pressure value, the steel ball compressed by the compression spring in the overload protection device is pushed away by the hydraulic oil of the overpressure value, and the high pressure oil overflows through the pores of the sliding sleeve and the inner hexagon nut, making the The oil pressure in the hydraulic cylinder drops, thereby implementing overload protection for the pre-tightened bolts.

The pressure value of the overload hydraulic pressure can be set by adjusting the inner hexagon nut.

Use a wrench to reverse (counterclockwise) turn the nut to return the piston of the hydraulic tensioner to its original state.

The beneficial effects of the utility model are: a hydraulic tensioner with an overload protection device is provided, which can prevent the phenomenon that the tensioner is overloaded and the bolts are broken due to misoperation or wrong pressure setting Occurs, improving the reliability of the hydraulic tensioner.

【Description of drawings】

Accompanying drawing 1 is the structural representation of the utility model with the hydraulic tensioner of overload protection device;

Accompanying drawing 2 is the schematic structural diagram of the overload protection device.

The symbols in the attached drawings are:

1. Nut sleeve, 2. Support sleeve, 3. Pull rod with nut sleeve, 4. Hydraulic cylinder, 5. Quick connector, 6. Piston, 7. Nut, 8. Wrench, 9. Overload protection device, 10. Tensioned Bolt, 11, the nut that is installed on the stretched bolt, 12, steel ball, 13, spring guide shaft, 14, sliding sleeve, 15 compression spring, 16, inner hexagon nut.

【Detailed ways】

Provide the specific embodiment of the utility model below in conjunction with accompanying drawing.

See attached drawing 1. The utility model has a hydraulic tensioner with an overload protection device, which includes a nut sleeve 1, a support sleeve 2, a pull rod with a nut sleeve 3, a hydraulic cylinder 4, a quick joint 5, a piston 6, a nut 7, a wrench 8, and a tensioned bolt 10. The nut 11 installed on the stretched bolt also includes an overload protection device 9; the stretched bolt 10 is set at the lower end of the pull rod 3 with a nut sleeve, and the nut 7 is set at the upper end of the pull rod 3 with a nut sleeve; The hydraulic cylinder 4 is arranged on the support sleeve 2, and the piston 6 is installed in the hydraulic cylinder 4; the nut 7 is in contact with the piston 6, and the hydraulic cylinder 4 is connected with the high-pressure pump through the quick joint 5 (not shown in the figure).

See attached drawing 2. The overload protection device 9 is set on the piston 6, and is composed of a steel ball 12, a spring guide shaft 13, a sliding sleeve 14, a compression spring 15, and an inner hex nut 16. A round hole is set on the piston 6, and the steel ball 12 is placed on the piston. At the upper end of the small hole, install the sliding sleeve 14 and the compression spring 15 on the spring guide shaft 13, the spring guide shaft 13 is arranged in the piston hole, screw the inner hexagon nut 16 into the piston body through the inner hole of the piston hole, and press it tightly. Compresses the spring 15 and locks the spring guide shaft 13.

The working process of the utility model is as follows: install the support sleeve 2 on the surface of the workpiece to be connected, install the pull rod 3 with a nut sleeve on the tightened bolt 10, tighten the nut 7 with a wrench 8 to make it close to the piston 6; Start the high-pressure pump, so that the high-pressure oil enters the hydraulic cylinder 4, the pressure generated in the hydraulic cylinder 4 moves the piston 6 upward, and the tensioned bolt 10 is stretched through the pull rod 3 with a nut sleeve, so that the tensioned bolt 10 A gap (equal to the stroke of the hydraulic cylinder 4) appears between the nut 11 and the connected workpiece; at this time, the purpose of pre-tightening is realized by rotating the nut sleeve 1 and tightening the nut 11 installed on the tensioned bolt.

When the pressure in the hydraulic cylinder 4 exceeds the set pressure value, the steel ball 12 compressed by the compression spring 15 in the overload protection device 9 is pushed away by the hydraulic oil of the overpressure value, and the high pressure oil passes through the sliding sleeve 14 and the inner hexagon nut The hole of 16 overflows, and the oil pressure in the hydraulic cylinder 4 is dropped, thereby carries out overload protection to pretightening bolt.

After being stretched by the tension bolt 10, use the wrench 8 to rotate the nut 7 counterclockwise, and the piston 6 of the hydraulic tensioner can be returned to the initial position.

Adjusting the hexagon socket nut 16 in the overload protection device 9 can set the hydraulic pressure value of the overload protection device 9 .

Claims (4)

1, a kind of hydraulic elongator that has overload protection arrangement, contain nut sleeve (1), support set (2), band nut sleeve pull bar (3), hydraulic cylinder (4), snap joint (5), piston (6), nut (7), spanner (8), be tightened up bolt (10), be installed in the nut (11) on the bolt that is stretched, it is characterized in that, also comprise overload protection arrangement (9); Lower end at the pull bar (3) of being with nut sleeve is provided with the bolt (10) that is stretched, and in pull bar (3) upper end of band nut sleeve nut (7) is set; Hydraulic cylinder (4) is arranged on the support set (2), and piston (6) is installed in the hydraulic cylinder (4); Nut (7) contacts with piston (6), and hydraulic cylinder (4) links to each other with high-pressure pump by snap joint (5); Overload protection arrangement (9) is arranged on the piston (6).

2, the hydraulic elongator that has overload protection arrangement according to claim 1, it is characterized in that, described overload protection arrangement (9) is made of steel ball (12), the spring axis of guide (13), sliding sleeve (14), compression spring (15), hexagonal socket nut (16), is arranged in the circular hole on the piston (6); Steel ball (12) is placed in the upper end of aperture on the piston, sliding sleeve (14) and compression spring (15) are arranged on the spring axis of guide (13), the spring axis of guide (13) is arranged in the piston circular hole, screw in the piston circular hole with hexagonal socket nut (16) through piston circular hole inner hole thread, compress compression spring (15) and pin the spring axis of guide (13).

3, the hydraulic elongator that has overload protection arrangement according to claim 1 is characterized in that, with spanner (8) reverse rotation nut (7), the piston (6) of hydraulic elongator can be returned to reset condition.

4, the hydraulic elongator that has overload protection arrangement according to claim 1 is characterized in that, adjusts the force value that hexagonal socket nut (16) can be set overload protection arrangement (9) hydraulic pressure.

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