CN201102227Y - Integral hydraulic drawing device - Google Patents

Abstract

The utility model provides an integral type hydraulic elongator which comprises a support bushing, a retaining plate, a hydraulic cylinder, a piston, a tightening nut and a bolt to be drawn, etc; a nut sleeve is arranged on the support bushing through an elastic retaining ring and a bearing to form a part; in addition an automatic resetting device, a gear locking device and a travel indicator are also provided; the support bushing is arranged on the surface of the work piece to be connected; when the high-pressure oil is injected into the oil inlet of the elongator, a clearance is formed between the nut on the bolt to be drawn and the work piece to be connected; a clamp axis is rotated to drive a pinion, a bull gear and a locknut of the nut sleeve, which can realize the pre-tightening of the bolt to be drawn; after the high pressure oil in the hydraulic cylinder of the elongator is discharged, the tightening nut is pulled reversely so as to make the piston reset under the action of the return spring. The beneficial effect of the integral type hydraulic elongator is that the structure of the elongator is more compact; the operation is more convenient; the work efficiency is improved; and the entire drawing course can be observed and controlled through the travel indicator.

Description

Integral hydraulic tensioner

【Technical field】

The utility model relates to the technical field of mechanical design and manufacture, in particular to an integrated hydraulic tensioner with compact structure and convenient operation.

【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 is composed of a support sleeve, a nut sleeve, a hydraulic cylinder, a piston and a tension nut, etc., without a reset device, a gear locking device and a stroke indicator, so the operation is complicated and the work efficiency is not high.

【Content of utility model】

The purpose of the utility model is to overcome the deficiencies of the prior art and provide an integral hydraulic tensioner with a reset device, a gear locking device and a stroke indicator, so that the structure of the tensioner is more compact and the operation is more convenient.

In order to achieve the above object, the utility model integral hydraulic tensioner includes a support sleeve, a support plate, a hydraulic cylinder, a piston, a tension nut, a stretched bolt, a nut, a retaining ring, a nut sleeve and a bearing, and is characterized in that, The nut sleeve is installed on the support sleeve through the elastic retaining ring and the bearing to form a part. In addition, an automatic reset device, a gear locking device and a stroke indicator are also provided;

The automatic reset device includes a lower support plate, a return spring and an upper support plate; the lower support plate, the return spring and the upper support plate are arranged on the support sleeve, and a hydraulic cylinder is arranged between the upper support plate and the lower support plate, and the piston is installed In the hydraulic cylinder, one end of the tension nut with a nut sleeve is installed on the piston, and the other end is screwed into the tensioned bolt;

The gear locking device comprises a locking shaft, a gear frame, a pinion, a large gear, a circlip and a bearing; the locking shaft and the pinion are mounted on the gear frame, and the gear frame is mounted on a supporting sleeve; the large gear is installed On the support sleeve and the nut sleeve and engaged with the pinion, the elastic circlip and the bearing are installed on the support sleeve, and the nut sleeve can rotate freely relative to the support sleeve.

The stroke indicator is arranged on the cylinder body, a pointer is pasted on the support plate, and a scale is arranged on the side of the hydraulic cylinder.

The utility model includes at least four return springs.

The working process of the utility model integral hydraulic tensioner is:

Place the support sleeve on the surface of the workpiece to be connected, when high-pressure oil is injected into the oil inlet of the integral hydraulic tensioner, the bolt to be stretched is stretched, and a gap appears between the nut on the bolt to be stretched and the workpiece to be connected A slit, at this moment, rotating the locking shaft to drive the pinion, the bull gear and the nut cover lock nut can control the stretching of the stretched bolt and realize the pre-tightening of the stretched bolt.

Release the high-pressure oil in the hydraulic cylinder of the integral hydraulic tensioner, loosen the gear locking device, rotate the tightening nut in the opposite direction, the stretched bolt shrinks, and the piston returns to the initial position under the action of the return spring. People can observe or monitor the stretching process through the stroke indicator throughout the stretching process.

The positive effect of the utility model is that the structure of the tensioner is more compact, the operation is more convenient, and the working efficiency is improved by adopting the reset device, the gear locking and the stroke indicator.

【Description of drawings】

The accompanying drawing is a schematic structural view of the utility model integral hydraulic tensioner.

The symbols in the figure are:

1. Return spring, 2. Upper support plate, 3. Piston, 4. Hydraulic cylinder, 5. Tension nut, 6. Travel indicator, 7. Lock shaft, 8. Gear rack, 9. Pinion, 10. Bull gear, 11, stretched bolt, 12, nut, 13, circlip, 14, nut sleeve, 15, bearing, 16, support sleeve, 17, lower support plate, 18, connected workpiece.

【Detailed ways】

The specific implementation of the utility model integrated hydraulic tensioner is given below in conjunction with the accompanying drawings.

The utility model integral hydraulic stretcher mainly includes a support sleeve 16, a support plate, a hydraulic cylinder 4, a piston 3, a tension nut 5, a stretched bolt 11, a nut 12, an elastic retaining ring 13, a nut sleeve 14 and a bearing 15 , and an automatic reset device, a gear locking device and a stroke indicator 6; the automatic reset device includes a lower support plate 17, a return spring 1 and an upper support plate 2; the gear locking device includes a locking shaft 7, a gear frame 8, a pinion 9. Bull gear 10, circlip 13 and bearing 15.

The upper support plate 2 is installed on the piston 3, and the lower support plate 17 is installed on the hydraulic cylinder 4; there are four return springs 1 installed on the upper support plate 2 and the lower support plate 17. After the high-pressure oil, it can return the piston 3 to its original position; the locking shaft 7 and the pinion 9 are installed on the gear frame 8, and the gear frame 8 is installed on the support sleeve 16; the nut sleeve 14 is installed on the nut 12, and the large The gear 10 is installed on the support sleeve 16 and the nut sleeve 14, and meshes with the pinion 9; the nut sleeve 14 is installed on the support sleeve 16 through the circlip 13 and the bearing 15 to form a part, so that the nut sleeve 14 is opposite to the support sleeve. 16 can rotate freely. The stroke indicator is arranged on the cylinder body, the pointer is pasted on the support plate, and the two sides of the hydraulic cylinder 4 are provided with scales. The stroke indicator 6 installed on the upper support plate 2 can accurately mark the stretching process.

Place the supporting sleeve 16 on the surface of the workpiece 18 to be connected, the hydraulic cylinder 4 is installed on the supporting sleeve 16, the piston 3 is installed in the hydraulic cylinder 4, one end of the tension nut 5 is installed on the piston 3, and the other end is screwed into the Stretch the bolt 11; after injecting high-pressure oil into the oil inlet of the hydraulic cylinder 4, under the action of the piston 3, the stretched bolt 11 is stretched by the tension nut 5, so that the nut 12 on the stretched bolt 11 There is a gap (equal to the stroke of the hydraulic cylinder 4) between the connected workpiece 18; at this time, rotating the locking shaft 7 can drive the pinion 9, the bull gear 10 and the nut sleeve 14 and the nut 12, thereby realizing the tension of the bolt 11 stretching.

After being stretched by the tension bolt 11, if the high-pressure oil in the hydraulic cylinder 4 is released, the tightening nut 5 is rotated in the opposite direction to return to the initial position, and under the action of the return spring 1, the piston 3 also returns to the initial position.

People can observe or monitor the stretching process through the travel indicator 6 during the entire stretching process.

Claims (3)

1. An integral hydraulic tensioner, comprising a support sleeve (16), a support plate, a hydraulic cylinder (4), a piston (3), a tension nut (5), a bolt to be stretched (11), a nut (12 ), circlip (13), nut cover (14) and bearing (15), it is characterized in that nut cover (14) is installed on the support sleeve (16) by circlip (13) and bearing (14) form one part, additionally, it is provided with an automatic reset device, a gear locking device and a travel indicator (6); Described automatic reset device comprises lower support plate (17), return spring (1) and upper support plate (2); Lower support plate (17), return spring (1) and upper support plate are set on support sleeve (16) Plate (2), a hydraulic cylinder (4) is set between the upper support plate (2) and the lower support plate (17), the piston (3) is installed in the hydraulic cylinder (4), and the tension nut (5) has a nut sleeve One end of the pull rod is installed on the piston (3), and the other end is screwed into the stretched bolt (11); Described gear locking device comprises locking shaft (7), gear carrier (8), pinion (9), bull gear (10), circlip (13) and bearing (15); Locking shaft (7 ) and pinion (9) are installed on the gear frame (8), and the gear frame (8) is installed on the support sleeve (16); the large gear (10) is installed on the support sleeve (16) and the nut sleeve (14) and Engaged with the pinion (9), the circlip (13) and the bearing (15) are installed on the support sleeve (16), and the nut sleeve (14) can rotate freely relative to the support sleeve (16). 2. The integral hydraulic tensioner according to claim 1, characterized in that the stroke indicator (6) is set on the cylinder body, the pointer is pasted on the support plate, and the stroke indicator (6) is placed on the side of the hydraulic cylinder (4). With graduations. 3. The integrated hydraulic tensioner according to claim 1, characterized in that it comprises at least four return springs.

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