CN214923695U

CN214923695U - Hydraulic expansion mandrel

Info

Publication number: CN214923695U
Application number: CN202120645986.3U
Authority: CN
Inventors: 杨成
Original assignee: Aien Precision Wuxi Co ltd
Current assignee: Aien Precision Wuxi Co ltd
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2021-11-30
Anticipated expiration: 2031-03-30

Abstract

The utility model relates to the technical field of mechanical detection, and discloses a hydraulic expansion mandrel, which comprises a mandrel body, a thin-wall sleeve and a pressure regulating piece, wherein the mandrel body is provided with a first oil cavity and a second oil cavity which are connected in an angle manner, and the side wall of the mandrel body is provided with an oil hole communicated with the first oil cavity; the thin-wall sleeve is sleeved on the mandrel body, a pressure regulating oil cavity is formed between the thin-wall sleeve and the mandrel body, the oil hole is communicated with the pressure regulating oil cavity, and the thin-wall sleeve can expand and contract; the pressure regulating part is arranged in the second oil cavity and can move along the second oil cavity. The utility model provides a tight dabber expands of hydraulic pressure examines time measuring to axle sleeve class work piece, can easy dismounting, low price, convenient to use are reliable moreover.

Description

Hydraulic expansion mandrel

Technical Field

The utility model relates to a mechanical detection technical field especially relates to a hydraulic pressure tight dabber that expands.

Background

The requirement on the mechanical detection precision is higher and higher in the detection process of mechanical parts, some shaft sleeve parts are often encountered in the detection process, and the parts are extremely easy to scratch or press mark due to carelessness in the clamping or detection process and need to be clamped and positioned. The core shaft is divided into a common core shaft, a taper core shaft, a mechanical expansion core shaft, a hydraulic expansion core shaft and the like. The positioning and clamping precision of the common mandrel, the taper mandrel and the mechanical expansion mandrel is low, and the detection precision is difficult to ensure. The working surface of the hydraulic expansion mandrel is continuously closed, hydraulic pressure is generated through a manual tool or other automatic tools, and the inner hole of the part is expanded by utilizing the elastic deformation of the elastic part. The zero clearance fit between part hole and the dabber can be guaranteed, and the precision requirement can also be guaranteed to some hydraulic pressure inflation dabbers that have now on the market at present, but the product clamping mode is single and the structure is complicated, with high costs, and maintenance and manufacturing are difficult relatively.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hydraulic pressure tight dabber that expands, easy dismounting, low price, convenient to use are reliable.

To achieve the purpose, the utility model adopts the following technical proposal:

a hydraulic expansion mandrel for expanding a workpiece, comprising:

the mandrel comprises a mandrel body, wherein a first oil cavity and a second oil cavity which are connected in an angle mode are formed in the mandrel body, and an oil hole communicated with the first oil cavity is formed in the side wall of the mandrel body;

the thin-wall sleeve is sleeved on the mandrel body, a pressure regulating oil cavity is formed between the thin-wall sleeve and the mandrel body, the oil hole is communicated with the pressure regulating oil cavity, and the thin-wall sleeve can expand and contract;

and the pressure regulating part is arranged in the second oil cavity and can move along the second oil cavity.

Preferably, the mandrel body comprises a mandrel and an annular boss convexly arranged outside the mandrel, the first oil cavity is arranged on the mandrel, and the second oil cavity is arranged on the annular boss.

Preferably, the hydraulic expansion mandrel further comprises a limiting part, the limiting part is sleeved on the mandrel, one end of the limiting part is fixedly connected to the annular boss, and the other end of the limiting part is sleeved on the first end of the thin-wall sleeve.

Preferably, the second end of the thin-walled sleeve is provided with a guide slope.

Preferably, the mandrel is provided with a thimble hole along two axial ends of the thin-wall sleeve.

Preferably, the first oil cavity penetrates through two ends of the mandrel, and two ends of the first oil cavity are provided with first plugs.

Preferably, the second oil cavity penetrates through the annular boss, a second plug is arranged at one end of the second oil cavity, and the pressure regulating piece is arranged at the other end of the second oil cavity.

Preferably, the pressure adjusting member includes a screw threadedly engaged with the annular boss and a piston connected to the screw.

Preferably, a sealing groove is formed in the piston, a sealing ring is arranged in the sealing groove, and the sealing ring is attached to the cavity wall of the second oil cavity.

Preferably, the thin-walled sleeve material is 65 Mn.

The utility model has the advantages that:

the invention provides a hydraulic expansion mandrel, which is characterized in that a thin-wall sleeve capable of expanding and contracting is arranged on a mandrel body, the thin-wall sleeve is expanded and contracted through the movement of a pressure regulating piece in a second oil cavity, when a workpiece needs to be detected and fixed, the workpiece is sleeved outside the thin-wall sleeve, the pressure regulating piece moves towards the center direction of the second oil cavity, the oil pressure in the mandrel body is increased, the thin-wall sleeve expands, the workpiece is expanded, when the workpiece needs to be disassembled, the pressure regulating piece moves towards the opposite direction, the oil pressure in the mandrel body is reduced, the thin-wall sleeve contracts, the workpiece is taken down from the thin-wall sleeve, and when the workpiece such as a sleeve is detected, the hydraulic expansion mandrel is convenient to disassemble and assemble, low in price and convenient and reliable to use.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view of a hydraulic expansion mandrel according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a hydraulic expansion mandrel body provided in an embodiment of the present invention;

fig. 3 is a structural schematic diagram of a thin-walled sleeve of a hydraulic expansion mandrel provided by an embodiment of the present invention.

In the figure:

1. a mandrel body; 11. a mandrel; 111. an oil hole; 112. a thimble hole; 113. a first oil chamber; 12. an annular boss; 121. a second oil chamber;

2. a limiting member;

3. a thin-walled sleeve; 31. a first end; 32. a second end;

4. a first plug; 5. a second plug;

6. adjusting a pressing piece; 61. a screw; 62. a piston; 63. a seal ring;

7. and (5) a workpiece.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

As shown in fig. 1, the present embodiment provides a hydraulic expansion mandrel for expanding a workpiece 7, which includes a mandrel body 1, a thin-walled sleeve 3 and a pressure regulating member 6, wherein the mandrel body 1 is provided with a first oil chamber 113 and a second oil chamber 121 which are connected at an angle, and the sidewall of the mandrel body 1 is provided with an oil hole 111 communicating with the first oil chamber 113, in the present embodiment, the oil hole 111 is in a long strip shape; the thin-wall sleeve 3 is sleeved on the mandrel body 1, a pressure regulating oil cavity is formed between the thin-wall sleeve 3 and the mandrel body 1, the oil hole 111 is communicated with the pressure regulating oil cavity, and the thin-wall sleeve 3 can expand and contract; the pressure regulating member 6 is arranged in the second oil chamber 121, and the pressure regulating member 6 can move along the second oil chamber 121, in this embodiment, the material of the thin-wall sleeve 3 is 65 Mn. The first oil chamber 113 and the second oil chamber 121 are filled with hydraulic oil, and the hydraulic oil can be adjusted by moving the pressure regulating member 6, so that the expansion and contraction of the thin-walled sleeve 3 can be controlled.

When a workpiece 7 needs to be detected and fixed, the workpiece 7 is sleeved outside the thin-wall sleeve 3, the pressure regulating piece 6 moves towards the center direction of the second oil cavity 121, so that the oil pressure in the mandrel body 1 is increased, the thin-wall sleeve 3 expands, the workpiece 7 is expanded, when the workpiece 7 needs to be disassembled, the pressure regulating piece 6 moves towards the opposite direction, so that the oil pressure in the mandrel body 1 is reduced, the thin-wall sleeve 3 contracts, the workpiece 7 is taken down from the thin-wall sleeve 3, and when the workpiece such as the mandrel is detected, the hydraulic expansion mandrel can be conveniently disassembled and assembled, and is low in price and convenient and reliable to use.

Further, as shown in fig. 1 and fig. 2, the mandrel body 1 includes a mandrel 11 and an annular boss 12 protruding outside the mandrel 11, the mandrel 11 is located in the first oil chamber 113, the annular boss 12 is located in the second oil chamber 121, the first oil chamber 113 runs through two ends of the mandrel 11, two ends of the first oil chamber 113 are both provided with a first plug 4, hydraulic oil is blocked, two ends of the first oil chamber 113 are also provided with a thimble hole 112, when a workpiece 7 is detected, the thimble is pushed against the thimble hole 112, the mandrel body 1 can be rotated, and detection is convenient. The second oil chamber 121 penetrates through the annular boss 12, one end of the second oil chamber 121 is provided with a second plug 5, and the other end of the second oil chamber is provided with a pressure regulating part 6. The second plug 5 is used for plugging one end of the second oil cavity 121, and the second end of the second oil cavity 121 is provided with a pressure regulating part 6 for regulating the pressure of hydraulic oil in the mandrel body 1 to expand the thin-wall sleeve 3 and further expand the workpiece 7, so that the workpiece 7 is fixed on the mandrel body 1, or the thin-wall sleeve 3 contracts to take the workpiece 7 off the mandrel body 1.

Further, as shown in fig. 1, the hydraulic expansion mandrel further includes a limiting member 2, the limiting member 2 is sleeved on the mandrel 11, and one end of the limiting member is fixedly connected to the annular boss 12, and the other end of the limiting member is sleeved on the first end 31 of the thin-walled sleeve 3. When the workpiece 7 is detected, the workpiece 7 is abutted against the other end of the limiting part 2, so that the limiting effect on the workpiece 7 can be achieved, the other end of the limiting part 2 is sleeved outside the thin-wall sleeve 3, the workpiece 7 can be located in the middle of the thin-wall sleeve 3 when the workpiece 7 is abutted against the limiting part 2, and the effect is more ideal in the process that the thin-wall sleeve 3 expands the workpiece 7 tightly. In this embodiment, the limiting member 2 is fixedly connected to the annular boss 12 through a boss screw.

Further, as shown in fig. 1 to 3, the second end 32 of the thin-walled sleeve 3 is provided with a guiding inclined surface, so that when the workpiece 7 is detected, the workpiece 7 can be easily mounted on the mandrel body 1, the workpiece 7 is effectively protected, and the surface of the workpiece 7 is prevented from being damaged due to touch when the workpiece 7 is detected.

Specifically, the mandrel 11 is a stepped shaft, a shoulder is disposed at a position where the mandrel 11 is matched with the thin-walled sleeve 3, and the shoulder is fixedly matched with the first end 31 and the second end 32 of the thin-walled sleeve 3, in this embodiment, the parts where the first end 31 and the second end 32 of the thin-walled sleeve 3 are matched with the mandrel 11 are fixed by welding. A pressure regulating oil cavity is formed between the part between the two shaft shoulders of the mandrel 11 and the thin-wall sleeve 3, hydraulic oil enters and exits the pressure regulating oil cavity through the oil hole 111 in the mandrel 11, the change of the oil pressure in the pressure regulating oil cavity is realized by regulating the pressure regulating piece 6, and the expansion and contraction of the thin-wall sleeve 3 are realized.

Further, as shown in fig. 1, the pressure adjusting member 6 includes a screw 61 threadedly engaged with the annular boss 12 and a piston 62 connected to the screw 61, and the piston 62 is fixedly connected to the screw 61. A sealing groove is formed in the piston 62, a sealing ring 63 is arranged in the sealing groove, and the sealing ring 63 is attached to the second oil chamber 121. The sealing ring 63 is attached to the cavity wall of the second oil cavity 121, so that hydraulic oil cannot leak in the pressure regulating process of the pressure regulating member 6, and the sealing effect is good.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Claims

1. A hydraulic expansion mandrel for expanding a workpiece (7), comprising:

the mandrel comprises a mandrel body (1), wherein a first oil cavity (113) and a second oil cavity (121) which are connected in an angle mode are formed in the mandrel body (1), and an oil hole (111) communicated with the first oil cavity (113) is formed in the side wall of the mandrel body (1);

the thin-wall sleeve (3) is sleeved on the mandrel body (1), a pressure regulating oil cavity is formed between the thin-wall sleeve (3) and the mandrel body (1), the oil hole (111) is communicated with the pressure regulating oil cavity, and the thin-wall sleeve (3) can expand and contract;

a pressure regulating member (6), wherein the pressure regulating member (6) is arranged in the second oil chamber (121), and the pressure regulating member (6) can move along the second oil chamber (121).

2. The hydraulic expansion mandrel as claimed in claim 1, wherein the mandrel body (1) comprises a mandrel (11) and an annular boss (12) protruding out of the mandrel (11), the first oil chamber (113) is provided in the mandrel (11), and the second oil chamber (121) is provided in the annular boss (12).

3. The hydraulically expanding mandrel as claimed in claim 2, further comprising a limiting member (2), wherein the limiting member (2) is sleeved on the mandrel (11), and one end of the limiting member is fixedly connected to the annular boss (12), and the other end of the limiting member is sleeved on the first end (31) of the thin-walled sleeve (3).

4. A hydraulically expanding mandrel as claimed in claim 1, characterised in that the second end (32) of the thin-walled sleeve (3) is provided with a guide bevel.

5. The hydraulically expanding mandrel as claimed in claim 2, characterized in that the mandrel (11) is provided with centre holes (112) along both axial ends of the thin-walled sleeve (3).

6. The hydraulic expansion mandrel as claimed in claim 2, wherein the first oil chamber (113) penetrates through two ends of the mandrel (11), and two ends of the first oil chamber (113) are provided with first plugs (4).

7. The hydraulic expansion mandrel as claimed in claim 6, characterized in that the second oil chamber (121) penetrates through the annular boss (12), and one end of the second oil chamber (121) is provided with a second plug (5) and the other end is provided with the pressure regulating member (6).

8. A hydraulic expansion mandrel according to claim 2 characterised in that the pressure regulating member (6) comprises a screw (61) in threaded engagement with the annular boss (12) and a piston (62) connected to the screw (61).

9. The hydraulic expansion mandrel as claimed in claim 8, wherein a sealing groove is formed in the piston (62), a sealing ring (63) is arranged in the sealing groove, and the sealing ring (63) is attached to the wall of the second oil chamber (121).

10. A hydraulically expanding mandrel according to claim 1, characterised in that the thin-walled sleeve (3) material is 65 Mn.