CN201970176U

CN201970176U - Grinding tool for sealing surface of check valve body

Info

Publication number: CN201970176U
Application number: CN201120033671XU
Authority: CN
Inventors: 魏成双; 孙盛丽; 魏崇巍
Original assignee: Harbin Turbine Co Ltd
Current assignee: Harbin Turbine Co Ltd
Priority date: 2011-01-30
Filing date: 2011-01-30
Publication date: 2011-09-14
Anticipated expiration: 2021-01-30

Abstract

The utility model relates to a grinding tool, in particular to a grinding tool for a sealing surface of a check valve body, which solves the problems of poor dimensional accuracy and long repairing cycle of the traditional method for repairing the sealing surface of a check valve body. A ball joint hole and a thin shaft penetrating hole are sequentially machined at the center of a grinding disc from the top down; the ball joint hole is communicated with the thin shaft penetrating hole; four grooves with semicircular cross sections are uniformly machined on the wall of the ball joint hole; a positioning shaft is vertically arranged; a ball joint of the positioning shaft is arranged in the ball joint hole; the lower end of a thin shaft penetrates through the thin shaft penetrating hole and is in threaded connection with a hexagonal nut; each hemispherical concave pit corresponds to one groove with the semicircular cross section and a steel ball is arranged between the concave pit and the groove; and a positioning disc is sleeved at the upper part of the positioning shaft. The grinding disc is centered through four steel balls when the positioning shaft rotates, the positioning is accurate, the operation is convenient, and the repairing time is shortened; in addition, the grinding tool provided by the utility model is used for repairing the sealing surface of the check valve body.

Description

A kind of non-return valve valve body sealing surface reconditioning instrument

Technical field

The utility model relates to a kind of reconditioning instrument, is specifically related to a kind of instrument that is used to repair the non-return valve valve body sealing surface.

Background technology

Non-return valve is a vitals of steam turbine unit, as shown in Figure 1.Non-return valve is in long-time running, because factors such as temperature, pressure, flow, groove mark appears after causing the valve body of non-return valve and valve disc sealing surface (Si Taili alloy) to wash away, and cause sealing surface poorly sealed, can't operate as normal, do not satisfy unit and normally move needs.

At present, when repairing non-return valve,, do not have special-purpose sealing surface fix tool, adopt poor dimensional precision after the existing method reparation, repairing efficiency long because the sealing surface of valve body is positioned at non-return valve inside.

The utility model content

The purpose of this utility model is not have special-purpose non-return valve sealing surface fix tool at present for solving, and adopts poor dimensional precision after the existing method reparation, the long problem of repairing efficiency, and then a kind of non-return valve valve body sealing surface reconditioning instrument is provided.

The utility model is to solve the problems of the technologies described above the technical scheme of taking to be: a kind of non-return valve valve body sealing surface reconditioning instrument of the present utility model is by positioning disc, locating shaft, abrasive disk, four steel balls and hex nut are formed, described locating shaft is by the locating shaft main body, bulb and small fine shaft constitute, described locating shaft main body and the coaxial setting of small fine shaft, and the two connects as one by bulb, uniformly on the sphere of described bulb be processed with four dome-type pits, the centre of sphere of described four dome-type pits all is positioned on the maximum cross-section of bulb, and the axis normal setting of described maximum cross-section and locating shaft main body; The center of described abrasive disk is processed with bulb hole and small fine shaft from top to bottom successively and passes the hole, described bulb hole and small fine shaft pass the hole and are interconnected, it is uniform on the hole wall in described bulb hole that to be processed with four cross sections be semicircular groove, described locating shaft vertically is provided with, the bulb of described locating shaft is positioned at the bulb hole, the lower end of small fine shaft is passed small fine shaft and is passed the hole and be threaded with hex nut, each dome-type pit is the corresponding setting of semicircular groove with a cross section, and be provided with a steel ball between the two, described positioning disc is sleeved on the top of locating shaft.

The beneficial effects of the utility model are: a kind of non-return valve valve body sealing surface reconditioning instrument of the present utility model adopts positioning disc and locating shaft location, when rotating, locating shaft makes abrasive disk centering by four steel balls, repair time has been shortened in accurate positioning, easy to operate; The sealing surface of non-return valve valve body roughness after grinding reaches Ra0.4, and dimensional accuracy satisfies specification requirement fully.

Description of drawings

Fig. 1 is the cutaway view of non-return valve, Fig. 2 is that reconditioning instrument of the present utility model is installed in the sectional arrangement drawing on the non-return valve, and Fig. 3 is the main pseudosection of positioning disc, and Fig. 4 is the front view of locating shaft, Fig. 5 is that the master of abrasive disk looks cutaway view, and Fig. 6 is the vertical view of Fig. 5.

The specific embodiment

The specific embodiment one: shown in Fig. 2～6, a kind of non-return valve valve body sealing surface reconditioning instrument of present embodiment is by positioning disc 1, locating shaft 2, abrasive disk 3, four steel balls 4 and hex nut 5 are formed, described locating shaft 2 is by locating shaft main body 2-1, bulb 2-2 and small fine shaft 2-3 constitute, described locating shaft main body 2-1 and the coaxial setting of small fine shaft 2-3, and the two connects as one by bulb 2-2, uniformly on the sphere of described bulb 2-2 be processed with four dome-type pit 2-2-1, the centre of sphere of described four dome-type pit 2-2-1 all is positioned on the maximum cross-section of bulb 2-2, and the axis normal setting of described maximum cross-section and locating shaft main body 2-1; The center of described abrasive disk 3 is processed with bulb hole 3-1 and small fine shaft from top to bottom successively and passes hole 3-2, described bulb hole 3-1 and small fine shaft pass hole 3-2 and are interconnected, it is uniform on the hole wall of described bulb hole 3-1 that to be processed with four cross sections be semicircular groove 3-1-1, described locating shaft 2 vertically is provided with, the bulb 2-2 of described locating shaft 2 is positioned at bulb hole 3-1, the lower end of small fine shaft 2-3 is passed small fine shaft and is passed hole 3-2 and be threaded with hex nut 5, each dome-type pit 2-2-1 is the corresponding setting of semicircular groove 3-1-1 with a cross section, and be provided with a steel ball 4 between the two, described positioning disc 1 is sleeved on the top of locating shaft 2.

The specific embodiment two: as shown in Figures 2 and 3, be processed with shoulder 1-1 on the outer wall of the described positioning disc 1 of present embodiment.So design, shoulder 1-1 is used to be overlapped on the upper surface of non-return valve valve body, repairs the back and conveniently takes out.Other composition and annexation are identical with the specific embodiment one.

The specific embodiment three: as shown in Figure 5, the profile of the Lower Half of the described abrasive disk 3 of present embodiment is a round platform, and the upper end diameter of described round platform is greater than lower end diameter, and the angle α between the bottom face of the bus of round platform and abrasive disk 3 is 60 °.So design, the abradant surface of assurance abrasive disk 3 and the sealing surface of non-return valve valve body are fitted fully, and the reconditioning precision is good.Other composition and annexation are identical with the specific embodiment one or two.

The specific embodiment four: as Fig. 2 and shown in Figure 4, the upper end of the described locating shaft main body of present embodiment 2-1 is processed with radial direction through hole 2-1-1.So design is used to place the cylindrical rod spanner, moves spanner and drives the locating shaft rotation.Other composition and annexation are identical with the specific embodiment three.

Operation principle:

Clear up the sealing surface of seal valve valve body earlier, fix tool of the present utility model is installed in the seal valve valve body, guarantee that abrasive disk 3 is positioned at the sealing surface place of seal valve valve body, by the slow rotational positioning axle 2 of cylindrical rod spanner, locating shaft 2 rotates drive abrasive disk 3 and feels relieved under the effect of four steel balls 4, sealing surface place at the seal valve valve body adds grounds travel, and abrasive disk 3 slowly rotates under the drive of locating shaft 2.

Claims

1. non-return valve valve body sealing surface reconditioning instrument, it is characterized in that: described reconditioning instrument is by positioning disc (1), locating shaft (2), abrasive disk (3), four steel balls (4) and hex nut (5) are formed, described locating shaft (2) is by locating shaft main body (2-1), bulb (2-2) and small fine shaft (2-3) constitute, described locating shaft main body (2-1) and the coaxial setting of small fine shaft (2-3), and the two connects as one by bulb (2-2), uniform four the dome-type pits (2-2-1) that are processed with on the sphere of described bulb (2-2), the centre of sphere of described four dome-type pits (2-2-1) all is positioned on the maximum cross-section of bulb (2-2), and the axis normal setting of described maximum cross-section and locating shaft main body (2-1); The center of described abrasive disk (3) is processed with bulb hole (3-1) from top to bottom successively and small fine shaft passes hole (3-2), described bulb hole (3-1) and small fine shaft pass hole (3-2) and are interconnected, it is uniform on the hole wall in described bulb hole (3-1) that to be processed with four cross sections be semicircular groove (3-1-1), described locating shaft (2) vertically is provided with, the bulb (2-2) of described locating shaft (2) is positioned at bulb hole (3-1), the lower end of small fine shaft (2-3) is passed small fine shaft and is passed hole (3-2) and be threaded with hex nut (5), each dome-type pit (2-2-1) is the corresponding setting of semicircular groove (3-1-1) with a cross section, and be provided with a steel ball (4) between the two, described positioning disc (1) is sleeved on the top of locating shaft (2).

2. a kind of non-return valve valve body sealing surface reconditioning instrument according to claim 1 is characterized in that: be processed with shoulder (1-1) on the outer wall of described positioning disc (1).

3. a kind of non-return valve valve body sealing surface reconditioning instrument according to claim 1 and 2, it is characterized in that: the profile of the Lower Half of described abrasive disk (3) is a round platform, the upper end diameter of described round platform is greater than lower end diameter, and the angle (α) between the bottom face of the bus of round platform and abrasive disk (3) is 60 °.

4. a kind of non-return valve valve body sealing surface reconditioning instrument according to claim 1 and 2, it is characterized in that: the upper end of described locating shaft main body (2-1) is processed with radial direction through hole (2-1-1).