CN209986252U - Hydraulic expansion mandrel - Google Patents

Abstract

The utility model relates to a hydraulic pressure inflation dabber, including dabber body, inflation cover and the hydraulic pressure mechanism that has gyration shape axle journal and axle base, the inflation cover is established on the axle journal, hydraulic pressure mechanism sets up this internal, be used for with the inflation cover is along radial outside extension. The utility model provides a hydraulic pressure inflation dabber promotes the cover through setting up at this internal hydraulic pressure mechanism of dabber and establishes the expansion sleeve on the dabber body and expand outward, realizes small-amplitude adjustment overall dimension, and then realizes connecting convenient firm, and dismantles convenient hydraulic pressure inflation dabber, need not the hydraulic pressure station, and simple structure is with low costs positioning accuracy height.

Description

Hydraulic expansion mandrel

Technical Field

The utility model relates to a lathe assistance-localization real-time equipment field especially relates to a hydraulic pressure inflation dabber.

Background

In actual production, for a certain wheel hub, because the bearing hole at one end is machined by a vertical lathe and the bearing hole at the other end is machined by a horizontal lathe and positioned by a fixed mandrel, the clearance between a product and the mandrel is too small to be easily put in and pulled out, the assembly efficiency is influenced, the manual labor intensity is increased, the clearance is too large, although the assembly is easy, the coaxiality of the two sections of bearing holes after machining is difficult to guarantee, and the product after machining is easily out of tolerance. It is therefore desirable to provide a mandrel which can be held in an interference fit with a relatively large clearance before installation.

SUMMERY OF THE UTILITY MODEL

In view of this, there is a need to provide a hydraulically expandable mandrel that addresses at least one of the problems mentioned above.

A hydraulic expansion mandrel comprises a mandrel body with a rotary shaft neck and a shaft base, an expansion sleeve and a hydraulic mechanism, wherein the expansion sleeve is sleeved on the shaft neck, and the hydraulic mechanism is arranged in the mandrel body and used for expanding the expansion sleeve outwards along the radial direction.

In one embodiment, the hydraulic mechanism comprises a pressurizing screw rod, a sealing cover, a pressurizing plunger and a plunger sleeve, a groove body matched with the plunger sleeve is arranged on the side end face of the shaft base, an oil passage is connected to the bottom of the groove body and extends to the side end face of the shaft neck, and an oil passage opening of the oil passage is positioned in the expansion sleeve; a sealing ring is arranged between the expansion sleeve near the oil port opening and the shaft neck; the plunger sleeve is arranged in the groove body, the sealing cover is arranged at the top end of the plunger sleeve, the pressurizing screw rod is in threaded connection with the sealing cover, the pressurizing plunger is arranged in the plunger sleeve and abuts against the top end of the pressurizing plunger, and the plunger sleeve and the oil duct are filled with hydraulic oil.

Furthermore, the cross sections of the oil passage and the oil passage opening are both circular, and the diameter of the oil passage opening is larger than that of the oil passage.

Furthermore, an annular oil storage groove with a preset depth is arranged on the inner wall of the expansion sleeve near the oil channel opening.

Further, the oil storage tank is also connected with an exhaust bolt, and the exhaust bolt is arranged on the top end face of the shaft neck.

In one embodiment, the expansion sleeve is connected with the mandrel body through a plurality of bolts.

The utility model provides a hydraulic pressure inflation dabber promotes the cover through setting up at this internal hydraulic pressure mechanism of dabber and establishes the expansion sleeve on the dabber body and expand outward, realizes small-amplitude adjustment overall dimension, and then realizes connecting convenient firm, and dismantles convenient hydraulic pressure inflation dabber, need not hydraulic pressure station, and simple structure is with low costs and positioning accuracy is high.

Drawings

Fig. 1 is a schematic diagram of an embodiment of a hydraulic expansion mandrel according to the present invention;

fig. 2 is a cross-sectional view of a hydraulic expansion mandrel according to an embodiment of the present invention;

fig. 3 is a sectional view of a hydraulic expansion mandrel according to another embodiment of the present invention.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides an embodiment provides a hydraulic pressure inflation dabber, as shown in fig. 1 and fig. 2, including the dabber body that has gyration shape axle base 110 and axle journal 120, inflation cover 200 and hydraulic pressure mechanism 300, inflation cover 200 cover is established on axle journal 120, inflation cover 200 wraps up axle journal 120, because axle journal 120 is the solid of revolution, inflation cover 200 also is gyration shape, it is preferred, inflation cover 200 adopts a plurality of bolted connection with the dabber body, a specific tie point is on axle base 110, another is on the axle journal 120 terminal surface, hydraulic pressure mechanism 300 sets up at the dabber originally internally, be used for radially outwards expanding inflation cover 200. The spindle base 110 is also used for connection to a machine tool. Because the utility model provides a hydraulic pressure inflation dabber does not need extra hydraulic pressure station, can use on the horizontal lathe that does not have the hydraulic pressure station, and both ends are porose and have the circular casing of coaxial requirement all can use, and simple structure is with low costs and positioning accuracy is high.

Specifically, as shown in fig. 2, the hydraulic mechanism 300 includes a pressurizing screw 310, a sealing cover 320, a plunger sleeve 330, and a pressurizing plunger 340, wherein a groove body matching with the plunger sleeve 330 is arranged on a side end surface of the shaft base 110, an oil passage 130 is connected to the bottom of the groove body, the oil passage 130 extends to a side end surface of the journal 120, and an oil port 131 of the oil passage 130 is located in the expansion sleeve 200. A sealing ring is arranged between the expansion sleeve 200 near the oil port opening 131 and the shaft neck 120, namely a sealed space exists between the oil port opening 131 and the expansion sleeve 200, and the expansion sleeve 200 is expanded to expand the peripheral size under the action of the expansion pressure of hydraulic oil. For the hydraulic mechanism 300, the plunger sleeve 330 is arranged in the groove, the sealing cover 320 is arranged at the top end of the plunger sleeve 330 and used for sealing the hydraulic mechanism 300, a base is provided for the movement of the pressurizing screw 310, the pressurizing screw 310 is in threaded connection with the sealing cover 320, the pressurizing plunger 340 is arranged in the plunger sleeve 330, the pressurizing screw 310 abuts against the top end of the pressurizing plunger 340, and the plunger sleeve 330 and the oil channel 130 are filled with hydraulic oil. There are several sealing elements in the hydraulic machine 300, ensuring that the hydraulic oil is sealed in the cavity of the hydraulic machine 300.

The specific shape of the sealed space may be varied, and as shown in fig. 2 and 3, the cross-sectional shapes of the oil passage 130 and the oil passage opening 131 are both circular, and the diameter of the oil passage opening 131 is larger than that of the oil passage 130.

Secondly, an annular oil storage groove with a predetermined depth is arranged on the inner wall of the expansion sleeve 200 near the oil channel opening 131. Because the annular groove 210 is formed on the inner wall of the expansion shell 200, the expansion shell 200 can form an expansion area at the annular groove 210 more easily.

Preferably, an exhaust bolt is further connected to the oil reservoir, and the exhaust bolt is disposed on the top end surface of the journal 120. The specific construction of the vent bolt is well known to those skilled in the art and will not be described in detail.

The hydraulic expansion mandrel is characterized in that an expansion sleeve 200 is inlaid on the outer ring of a mandrel main body, preferably, the thin-wall expansion sleeve 200 is inlaid on the outer ring of the mandrel main body, a sealed oil storage chamber is arranged between the expansion sleeve 200 and the mandrel main body, a pressurizing screw 310 is screwed after hydraulic oil is added, a pressurizing plunger 340 is driven to move downwards, pressure is generated by the hydraulic oil, the expansion sleeve 200 is subjected to pressure generated by the hydraulic oil in the oil storage chamber and deforms to expand outwards, so that a gap between the expansion sleeve 200 and a bearing hole of a product arranged on the outer side surface of the expansion sleeve 200 is eliminated, the product is ensured to be stably arranged on the mandrel, the coaxiality of the bearing holes at two ends of the product is ensured, as long as the pressurizing screw 310 rotates around, the.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (6)

1. The hydraulic expansion mandrel is characterized by comprising a mandrel body, an expansion sleeve and a hydraulic mechanism, wherein the mandrel body is provided with a rotary shaft neck and a shaft base, the expansion sleeve is sleeved on the shaft neck, and the hydraulic mechanism is arranged in the mandrel body and used for expanding the expansion sleeve outwards along the radial direction.

2. The hydraulic expansion mandrel as claimed in claim 1, wherein the hydraulic mechanism comprises a pressurizing screw, a sealing cover, a pressurizing plunger and a plunger sleeve, a groove body matched with the plunger sleeve is arranged on the side end face of the mandrel base, an oil passage is connected to the bottom of the groove body and extends to the side end face of the shaft neck, and an oil passage opening of the oil passage is positioned in the expansion sleeve; a sealing ring is arranged between the expansion sleeve near the oil port opening and the shaft neck; the plunger sleeve is arranged in the groove body, the sealing cover is arranged at the top end of the plunger sleeve, the pressurizing screw rod is in threaded connection with the sealing cover, the pressurizing plunger is arranged in the plunger sleeve and abuts against the top end of the pressurizing plunger, and the plunger sleeve and the oil duct are filled with hydraulic oil.

3. The hydraulic expansion mandrel of claim 2 wherein the cross-sectional shape of both the oil passage and the oil port opening is circular, the diameter of the oil port opening being greater than the diameter of the oil passage.

4. The hydraulic expansion mandrel as claimed in claim 2, wherein the inner wall of the expansion shell near the oil port opening is provided with an annular oil storage groove with a predetermined depth.

5. The hydraulic expansion mandrel of claim 4 wherein a vent bolt is further attached to the oil reservoir, the vent bolt being disposed on a top end face of the journal.

6. The hydraulic expansion mandrel of claim 1 wherein the expansion sleeve is connected to the mandrel body by a plurality of bolts.

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