CN217253140U

CN217253140U - Positioning fixture for washing and cutting Roots vacuum pump shell

Info

Publication number: CN217253140U
Application number: CN202123272738.8U
Authority: CN
Inventors: 马明全; 陆学贵
Original assignee: Zhejiang Boya Precision Machinery Co ltd
Current assignee: Zhejiang Boya Precision Machinery Co ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-08-23
Anticipated expiration: 2031-12-23

Abstract

The utility model discloses a roots vacuum pump shell washing cuts and uses positioning fixture, characterized by: comprises a bottom plate, an upper pressure plate and a lower pressure plate; the upper pressure plate is arranged on the bottom plate in a lifting manner, and the shell positioned on the bottom plate can be pressed downwards after the upper pressure plate moves downwards; the lower pressing plates are arranged on the bottom plate and correspond to the side faces of the shell, a second positioning screw and a third positioning screw are arranged on each lower pressing plate, the head of each second positioning screw abuts against the upper surface of each lower pressing plate, and the rod body of each second positioning screw penetrates through the lower pressing plate and is in threaded connection with the bottom plate; the head of the third positioning screw rod is abutted against the bottom plate, the rod body of the third positioning screw rod is in threaded fit with the threaded hole at one end of the lower pressing plate, which is far away from the shell, and one end of the lower pressing plate, which faces the shell, is abutted against the upper surface of the base of the shell. The utility model discloses can promote the stability to the casing location, and then promote the precision that the casing bottom surface was washed and is cut.

Description

Positioning fixture for washing and cutting Roots vacuum pump shell

Technical Field

The utility model relates to a location frock field especially relates to a roots vacuum pump casing is washed and is cut and use positioning fixture.

Background

Roots vacuum pump, for short: a Roots pump is a variable-capacity vacuum pump, in which two blade-shaped rotors rotating synchronously in opposite directions are installed in the pump, and small gaps are formed among the rotors and between the rotors and the inner wall of a pump shell so as not to be in contact with each other.

As shown in fig. 4, which is a schematic view of a housing 3 of a roots vacuum pump, an end face 31 of the housing 3 needs to be subjected to a washing process during a machining process to improve the flatness of the end face of the housing, and further improve the sealing performance after the end cap is covered. When the end face of the shell is washed and cut, a positioning tool needs to be adopted to fix the end face, and the tool structure for fixing the shell in the prior art comprises a bottom plate and a pressing plate arranged on the bottom plate in a lifting mode through a screw and a nut. In the positioning engineering, the shell is placed on the bottom plate, the nut matched with the screw rod is screwed downwards, the pressing plate is pressed downwards to move downwards in the descending process of the nut, and the pressing plate is pressed downwards on the top surface of the shell, so that the shell is positioned. This structure is in the in-service use in-process, because this location structure is too simple, and it is relatively poor to lead to the stability of casing location, leads to the problem of the easy emergence displacement behind the casing location to influence the precision of washing and cutting the casing. Therefore, there is room for further improvement in the housing positioning tool.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a roots vacuum pump shell is washed and is cut and use positioning fixture can promote the stability to the casing location, and then promotes the precision that the casing bottom surface was washed and is cut.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a roots vacuum pump casing is washed and is cut and use positioning fixture which characterized by: comprises a bottom plate, an upper pressure plate and a lower pressure plate;

the upper pressure plate is arranged on the bottom plate in a lifting manner, and the shell positioned on the bottom plate can be pressed downwards after the upper pressure plate moves downwards;

the lower pressing plates are arranged on the bottom plate and correspond to the side faces of the shell, a second positioning screw and a third positioning screw are arranged on each lower pressing plate, the head of each second positioning screw abuts against the upper surface of each lower pressing plate, and the rod body of each second positioning screw penetrates through the lower pressing plate and is in threaded connection with the bottom plate; the head of the third positioning screw rod is abutted against the bottom plate, the rod body of the third positioning screw rod is in threaded fit with the threaded hole at one end of the lower pressing plate, which is far away from the shell, and one end of the lower pressing plate, which faces the shell, is abutted against the upper surface of the base of the shell.

Preferably, the two ends of the upper pressing plate are both provided with first positioning screws, the lower ends of the first positioning screws are fixed on the bottom plate, and the upper ends of the first positioning screws are in threaded fit with locking nuts capable of pressing down the upper pressing plate.

Preferably, a limiting part for abutting against the side surface of the shell base is formed on the lower surface of the lower pressure plate.

Preferably, the lower pressing plate is provided with a kidney-shaped hole for the second positioning screw to pass through and a threaded hole for the third positioning screw to be in threaded fit.

Preferably, a plastic plate is compounded on the lower surface of the upper pressing plate.

The utility model has the advantages that: the stability of casing location can be showing to promote to the top board cooperation holding down plate, can avoid the casing to wash the problem of cutting the in-process at the terminal surface and take place the displacement, consequently showing the precision that promotes the washing of casing terminal surface and cut, promote the quality of casing.

Drawings

Fig. 1 is a front view of a positioning jig for washing and cutting a roots vacuum pump housing provided in the present embodiment;

FIG. 2 is a side view of the lower platen provided in the present embodiment;

FIG. 3 is a top view of the lower platen according to the present embodiment;

fig. 4 is a schematic diagram of the housing requiring washing and cutting according to the embodiment.

Detailed Description

The positioning fixture for washing and cutting the housing of the roots vacuum pump of the present invention will be further described with reference to fig. 1 to 4.

The utility model provides a roots vacuum pump casing is washed and is cut and use positioning fixture which characterized by: comprises a bottom plate 1, an upper pressure plate 4 and a lower pressure plate 5. The upper pressing plate 4 is arranged on the bottom plate 1 in a lifting mode, and the upper pressing plate 4 can press the shell 3 on the bottom plate 1 downwards after moving downwards. The lower pressing plates 5 have a plurality of blocks, are all arranged on the bottom plate 1, and correspond to the side surfaces of the shell. Each lower pressing plate 5 is provided with a second positioning screw 52 and a third positioning screw 51, the head of the second positioning screw 52 is pressed against the upper surface of the lower pressing plate 5, and the rod body of the second positioning screw 52 penetrates through the lower pressing plate 5 and is in threaded connection with the threaded hole on the bottom plate 1; the head of the third positioning screw 51 abuts against the bottom plate 1, the rod body of the third positioning screw 51 is in threaded fit with a threaded hole 54 at one end of the lower press plate 5 far away from the shell 3, and one end 56 of the lower press plate 5 facing the shell abuts against the upper surface of the shell base 32.

Specifically, the lower pressing plates 5 are provided with six groups, two groups are respectively arranged at the left side and the right side of the shell 3, and one group is respectively arranged at the front end and the rear end of the shell so as to position each side surface of the shell; the upper press plates 4 are provided in two sets and arranged in the front-rear direction of the casing to press the front and rear end portions of the casing.

Through holes are formed in the two ends of the upper pressing plate 4, a first positioning screw rod 41 is matched in the through holes, the lower end of the first positioning screw rod 41 is fixed on the bottom plate 1 in a welding or threaded connection mode, and a locking nut 42 capable of pressing down the upper pressing plate 4 is matched with the upper end of the first positioning screw rod in a threaded mode.

A limiting part 53 for abutting against the side surface of the shell base 32 is formed on the lower surface of the lower pressure plate 5. To position the housing in a horizontal direction.

The lower pressure plate 5 is provided with a kidney-shaped hole 55 for the second positioning screw 52 to pass through and a threaded hole 54 for the third positioning screw 51 to be in threaded fit. The kidney-shaped hole 55 can facilitate the movement of the second positioning screw 52 relative to the lower press plate 5, facilitate the adjustment of the position of the lower press plate 5, and even facilitate the limit portion 53 to effectively press against the side surface of the housing base 32.

And a plastic plate is compounded on the lower surface of the upper pressing plate 4. This plastic slab can play the guard action to the top surface of casing, avoids the problem that the casing top surface is by upper pressure plate 4 pressure losses.

A base plate 2 for placing the shell is also arranged on the bottom plate 1.

In specific use, the shell 3 is placed on the base plate 2; the front upper pressure plate 4 and the rear upper pressure plate 4 are pressed on the upper surfaces of the front end and the rear end of the shell and are locked by the locking nuts 42; the position of the lower pressing plate 5 is adjusted through the waist-shaped hole 55, so that the limiting part 53 of the lower pressing plate 5 can effectively abut against the side surface of the shell base while the lower pressing plate 5 abuts against the upper surface of the shell base towards one end of the shell; and rotating the third positioning screw 51, and driving one end of the lower pressing plate 5, which is back to the shell, to upwarp under the action of the thread matching force, so as to drive the lower pressing plate 5 to press down towards one end of the shell, so that one end of the lower pressing plate 5, which is towards the shell, is stably pressed on the upper surface of the base of the shell, and the rest lower pressing plates 5 operate in the same way. Thereby achieving stable positioning of the housing.

In the process, the second positioning screw 52 is in threaded fit with the threaded hole in the bottom plate 1, so that the height of the supporting point of the lower pressing plate 5 can be adjusted by the second positioning screw 52, one end of the lower pressing plate 5, facing the shell, can be abutted against the positions of the shell with different heights, and the flexibility of positioning the shell is improved.

Unless otherwise specified, in the present invention, if the terms "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are used for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings.

Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass both fixed and removable connections, or integral connections; 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.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a roots vacuum pump casing is washed and is cut and use positioning fixture which characterized by: comprises a bottom plate, an upper pressure plate and a lower pressure plate;

the upper pressing plate is arranged on the bottom plate in a lifting manner, and the shell positioned on the bottom plate can be pressed downwards after the upper pressing plate moves downwards;

the lower pressing plates are arranged on the bottom plate and correspond to the side faces of the shell, a second positioning screw and a third positioning screw are arranged on each lower pressing plate, the head of each second positioning screw abuts against the upper surface of each lower pressing plate, and the rod body of each second positioning screw penetrates through the lower pressing plate and is in threaded connection with the bottom plate; the head of the third positioning screw rod is abutted against the bottom plate, the rod body of the third positioning screw rod is in threaded fit with the threaded hole at one end, far away from the shell, of the lower pressing plate, and one end, facing the shell, of the lower pressing plate is abutted against the upper surface of the base of the shell.

2. The positioning jig for washing and cutting a roots vacuum pump housing as set forth in claim 1, wherein: the two ends of the upper pressing plate are respectively provided with a first positioning screw rod, the lower end of each first positioning screw rod is fixed on the bottom plate, and the upper end of each first positioning screw rod is in threaded fit with a locking nut capable of pressing down the upper pressing plate.

3. The positioning jig for washing and cutting a roots vacuum pump housing as set forth in claim 1, wherein: and a limiting part for supporting the side surface of the shell base is formed on the lower surface of the lower pressing plate.

4. The positioning jig for washing and cutting a roots vacuum pump housing as set forth in claim 3, wherein: the lower pressing plate is provided with a kidney-shaped hole for the second positioning screw to pass through and a threaded hole for the third positioning screw to be in threaded fit.

5. The positioning jig for washing and cutting a roots vacuum pump housing as set forth in claim 1, wherein: and a plastic plate is compounded on the lower surface of the upper pressing plate.