RU182142U1 - SAFETY VALVE TIGHTENING DEVICE - Google Patents

Abstract

The invention relates to the field of pipe fittings, in particular, to a device for restoring the tightness of a safety valve and can be used in equipment for repairing relief spring safety valves (SPPK), namely, in devices for restoring the tightness of mating pairs of a spool - safety valve seat and restoration tightness of sealing surfaces of safety valves. The technical result that can be achieved using the proposed utility model is reduced to the high quality of the plane of the grinding surfaces, simplifying and reducing the time of the installation and removal of the working tool - the grinding disk, which makes it possible to solve the technical problem of improving the quality of the plane of the grinding surfaces, simplifying and reducing the time of the installation and removal of the working tool - lapping disk. The device for restoring the tightness of the safety valve consists of a lapping mechanism 1 with a shank 2, a guide flange 3 with a welded sleeve 4, in which needle bearings 5, a chuck 6 with racks 7, a disk 8 of a lapping and low-speed electric drive are installed (not shown in Fig. Not shown ) with a power of 450-700 W, while the lapping mechanism 1 is an assembled rotor, consisting of a metal cup 9 with guide flanges 3 in which radial bearings 10 are installed (GOST 8882-75), with a shaft 11, p At the same time, a planetary gear consisting of three satellites 12, a movable carrier 13 with a lock (not shown in FIG.), a central gear (not shown in FIG.), blindly mounted on shaft 11, and a ring gear 14 is installed in the upper part of the rotor fixed inside the metal cup 9, and on the shaft 11, a shank 2 is screwed on top to transmit rotational motion to the shaft 11, and a pin 15 is pressed in from below (GOST 3128-70), for swiveling with the shank 2 of the grinding disk 8, while the shaft 11 is moved from vertical movement locks m ring 16 (GOST 13942-86), and the axis of the shaft 11 is offset from the axis of the rotor by 3 mm, which sets the value of the eccentric rotation. IL 2

Description

The technical field to which the utility model relates.

The invention relates to the field of pipe fittings, in particular, to a device for restoring the tightness of a safety valve and can be used in equipment for repairing relief spring safety valves (SPPK), namely, in devices for restoring the tightness of mating pairs of a spool - safety valve seat and restoration tightness of sealing surfaces of safety valves.

State of the art

Known devices for restoring the tightness of sealing surfaces, which are divided into stationary general-purpose equipment and portable specialized models, while on stationary general-purpose machines that can be equipped with one or more grinding tools, large parts with flat and cylindrical surfaces are mainly processed, and portable specialized machines, as a rule, are equipped with one (interchangeable) grinding tool and are used for erativnoy processing mating surfaces, including without dismantling the latter. The main function of these machines is a rotatable spindle with a pivotally attached lapping, while the rotational movement from the lapping is transmitted to the lapping with abrasive elements, and the rotating lapping is in contact with the machined surface of the seat or spool and uniformly removes a thin layer of metal (see PKTBA - PUR -5 manufactured by the Penza Design and Technology Bureau of Valve Engineering CJSC, Machine PR-UPK-15/200 manufactured by CJSC Special Technological Enterprise ologii ").

The disadvantage of these machines is the low quality of the plane of the grinding surfaces, due to the simple rotation of grinding in about its own axis, while with simple grinding of grinding with grinding on the grinding surface of the seat or spool, the abrasive elements have different linear speeds, and those abrasive elements that are closer to the center of rotation lapping have a lower linear velocity compared with elements located at the outer edge of the lapping, thus, due to different linear speeds of the elements braziva occurs uneven polishing surface, wherein the outer part or valve seat is subjected to more intensive influence lapping abrasive material, and as a result, the lapping surface having a convex profile and insufficient contact area, causing insufficient tightness of the valve.

Known portable grinder and lapping machine Unigrid type SVSI for processing sealing surfaces of safety valves, devoid of the disadvantages of the above machines, while in order to eliminate the effect of different linear speeds, the machine type Unigrid SVSI reproduces the complex rotational movement of grinding with abrasive material, ensuring high quality grinding surfaces, and the design allows you to quickly change abrasive material (see. Portable grinding and grinding equipment , firm Unigrid VENTA, Germany. Repair equipment. Unigrid. de> assets / files / paf / unigrid-product. Representative office in Russia: Uni Prom Tech-GROUP LLC, 127486, Moscow, Deguninskaya St., 1 , bldg. 2, tel. (495) 2255213).

The disadvantage of this machine is the complexity of the design, the high cost of both the main equipment and consumables and the low grinding speed, which is essential in the presence of deep surface damage.

Known portable machine for the mechanical treatment of sealing surfaces, mainly in the valves of the housings and pressure elements (wedges, discs, spools) of flanged valves and valves during their repair. The machine contains a drive, a faceplate with a carriage and a cutter, a hollow boring bar with a spindle in its inner cavity, while the boring bar spindle is kinematically connected to each other: on the one hand through the face plate and the carriage carrying the cutter, on the other hand through a drive, gears, detachable couplings, differential gear. The proposed kinematic scheme with one drive for rotating the boring bar with the cutter and for radial movement of the cutter will allow you to create a compact head with a minimum weight (see US Pat. RU No. 2144449, IPC VV 41/00, publ. 20.01.2000).

The disadvantage of this machine is the design complexity and low quality of the plane of the grinding surfaces.

The closest in technical essence and the achieved positive effect and adopted by the authors for the prototype is a device for restoring the tightness of a safety valve containing a guide flange with a sleeve, a lapping mechanism with a shank representing the rotor assembly, a working tool - a lapping disk and an electric drive, with a capacity of 450-700 W, which is characterized in that it contains a rotatable spindle with a pivotally fixed lapping disk, while rotationally The movement from the drive is transmitted to the grinding disk with abrasive elements, the rotating grinding disk contacts the work surface (saddle or spool) with a certain force and uniformly removes a thin layer of metal (see Pelikan grinding machine, yandex.ru/ images).

The disadvantage of this device, as in the above devices, is the insufficiently high quality of the plane of the grinding surfaces, due to the simple rotation of the grinding around its own axis, while with a simple rotation of grinding with grinding on the grinding surface of the seat or spool, the abrasive elements have different linear speeds. Those elements of the abrasive that are located closer to the center of the lapping have a lower speed, and those that are located to the edge of the lapping - more. In this regard, uneven grinding of the surface of the seat or spool of the safety valve occurs. The outer part of the seat or spool is exposed to more intense abrasive material grinding. And as a result, the grinding surface has a convex profile and insufficient contact area, which is the reason for the lack of tightness of the valve. The complex and lengthy process of installing and removing the grinding tool is determined by the design features of the machines. Developers of known types of machines do not take into account the fact that the effective operating time of abrasive material is no more than 1-2 minutes at nominal spindle speeds of the drive device. Then you need to clean or replace the abrasive material. The replacement of abrasive material entails the dismantling of the entire device, and subsequent installation with new abrasive material. Significant loss of time occurs when installed in the same position.

Utility Model Disclosure

The objective of the proposed utility model is the development of a device for restoring the tightness of safety valves, which has a high quality of the plane of the grinding surfaces, simplifying and reducing the time of the installation and removal of the working tool - grinding disk.

The technical result that can be achieved using the proposed utility model is reduced to the high quality of the plane of the grinding surfaces, simplifying and reducing the time of the installation and removal of the working tool - the grinding disk, which makes it possible to solve the technical problem of improving the quality of the plane of the grinding surfaces, simplifying and reducing the time of the installation and removal of the working tool - lapping disk.

The technical result is achieved using a device for restoring the tightness of a safety valve, comprising a lapping mechanism with a shank, which is a rotor, consisting of a metal cup with a guide flange with a welded sleeve, in which radial bearings with a driven shaft are mounted on which the shank is screwed on top and on the bottom a pin has been pressed in for swiveling with the shank of the grinding disc with abrasive and low-speed electric drive, while the guide flange The welded hub has holes and cutouts for mounting and fixing it on all types of safety valves, and the sleeve contains a pair of needle bearings for rotation of the grinding mechanism, while a planetary gear is installed in the upper part of the grinding mechanism rotor, the central gear of which is blindly mounted the driven shaft, its ring gear is fixed inside the metal cup of the rotor, and the movable carrier with three satellites is equipped with a latch, and the axis of the driven shaft is offset from the axis rotor 3 mm for the possibility of rotation of the shaft clockwise and eccentric rotation of the rotor counterclockwise.

Thus, the technical result is achieved by the proposed design of the device for restoring the tightness of the safety valve, in which the rotor of the lapping mechanism with the shank is equipped with a planetary gear consisting of a central gear, blindly mounted on the shaft, a movable carrier with a retainer and three satellites, a crown gear fixed inside the rotor, moreover

the axis of the shaft is offset from the rotor axis by 3 mm, with the possibility of determining the magnitude of the eccentric rotation, while the guide flange with the welded sleeve contains holes and cutouts that allow installation and fixing it on all types of safety valves, and the sleeve contains a pair of needle bearings, where it is free the grinding mechanism can rotate, which is a complete rotor and consisting of a metal sleeve, at the ends of which are placed radial bearings with a driven shaft, and the center of the shaft is offset from the center of the rotor by 3 mm, which sets the eccentricity while rotating the rotor and shaft. The rotor of the lapping mechanism with the shank is equipped with a planetary gear, with the central gear mounted on the driven shaft, the crown gear mounted on the rotor, and the movable carrier with three satellites is equipped with a lock, which during rotation of the shaft is kept from rotation, while applying rotation to the shaft shaft, the lock holds the mobile carrier from rotation, and the three planetary gear satellites rotate the rotor itself in the opposite direction at a speed approximately two times lower than the shaft, thus the lapping disk is the sum of two rotations: the shaft clockwise and the rotor rotation counterclockwise, and the device can be used in two configurations: grinding the spool and grinding the seat, grinding the spool after fixing it in the chuck and installing the flange with the guide sleeve on the uprights cartridge, and grinding the seat is made after installing the flange with a guide sleeve directly on the body of the safety valve.

Brief Description of the Drawings

In FIG. 1 shows a device for restoring the tightness of a safety valve, a general sectional view.

In FIG. 2, too, a sectional lapping mechanism with a shank.

Utility Model Implementation

The device for restoring the tightness of the safety valve consists of a lapping mechanism 1 with a shank 2, a guide flange 3 with a welded sleeve 4, in which needle bearings 5, a chuck 6 with racks 7, a disk 8 of a lapping and low-speed electric drive are installed (not shown in Fig. Not shown ) with a power of 450-700 W, while the lapping mechanism 1 is an assembled rotor, consisting of a metal cup 9 with guide flanges 3 in which radial bearings 10 are installed (GOST 8882-75), with a shaft 11, p At the same time, a planetary gear consisting of three satellites 12, a movable carrier 13 with a lock (not shown in FIG.), a central gear (not shown in FIG.), blindly mounted on shaft 11, and a crown gear 14 is fixed in the upper part of the rotor inside the metal cup 9, and on the shaft 11, a shank 2 is screwed on top to transmit rotational motion to the shaft 11, and a pin 15 (GOST 3128-70) is pressed in from below, for swiveling with the shank 2 of the grinding disk 8, while the shaft 11 is fixed from vertical movement locky ring 16 (GOST 13942-86), the axis of the shaft 11 is offset from the rotor axis by 3 mm than the value given by the eccentric rotation.

A device for restoring the tightness of the safety valve is operated as follows.

To grind the safety valve spool, it is fixed in the chuck 6 with uprights 7 with the grinding surface upwards, when the rotational movement of the shaft 11 is communicated through the shank 2, with a pressed pin 15 for swiveling with the shank 2, while the shaft 11 transmits the movement to the articulated disk 8 lapping moreover, from vertical movement, the shaft 11 is fixed by the locking ring 16, while at the same time, when the movable carrier 13 is fixed with a retainer, a planetary gear installed in the upper part of the rotor consisting of three satellites 12, the movable carrier 13 with

the retainer, the Central gear blindly mounted on the shaft 11, the ring gear 14, which is fixed inside the metal Cup 9, rotates the entire rotor in the needle bearings 5 in the opposite direction with a speed of approximately two times lower than the speed of the shaft 11, thus, the device implements two different rotations of the grinding disk 8 with an abrasive. The first is the rotation of the shaft 11 around its own axis in radial bearings 10 clockwise with direct transmission from a low-speed electric drive with a capacity of 450-700 watts. The second is the rotation of the rotor itself in the needle bearings 5, installed in the welded sleeve 4 of the guide flange 3, in the opposite direction with a reduced gear due to the separation of the rotation of the planetary gear with three satellites 12, while the magnitude of the eccentric rotation is set by shifting the axis of the shaft 11 from the axis of the rotor by 3 mm.

To lap the saddle, the device is mounted on the body (not shown in FIG.) Of the safety valve with the dismantled spring unit and fixed on standard studs (not shown in FIG.).

For quick cleaning of abrasive material or its replacement, the device itself is not removed from the safety valve, and the lapping disk 8 is removed together with the lapping mechanism 1 from the guide flange 3, and after replacing or cleaning the abrasive material of the lapping disk 8, the lapping mechanism 1 together with the lapping disk 8 are installed back to needle bearings 5.

A device for restoring the tightness of safety valves has been manufactured and tested. One device includes two guide flanges 3 and two rotors corresponding to them: for valves with sizes ДУ25-ДУ80 and ДУ80-ДУ-200, while chuck 6 with racks 7 is common for both guide flanges 3.

The proposed utility model in comparison with the prototype and other known technical solutions has the following

advantages:

- high quality of the plane of grinding surfaces due to the implementation of complex rotational motion;

- simplification and reduction of the time of the installation and removal of the working tool - lapping disk;

- simplification and reduction of the cost of the design of the device;

- the possibility of simultaneously grinding the spool and saddle, as an increase in productivity of the device.

Claims (1)

A device for restoring the tightness of a safety valve, comprising a lapping mechanism with a shank representing a rotor, consisting of a metal cup with a guide flange with a welded sleeve, in which radial bearings with a driven shaft are mounted on which a shank is screwed on top and a pin for swiveling is pressed in below with a shank of a grinding disk with an abrasive and a low-speed electric drive, while the guide flange with a welded sleeve has holes and a hole for the possibility of installing and fixing it on all types of safety valves, and the sleeve contains a pair of needle bearings for the possibility of rotation of the grinding mechanism, while a planetary gear is installed in the upper part of the grinding mechanism rotor, the central gear of which is blindly mounted on the driven shaft, its crown gear is fixed inside the metal cup of the rotor, and the movable carrier with three satellites is equipped with a latch, and the axis of the driven shaft is offset from the axis of the rotor by 3 mm for rotation of the shaft clockwise rotation of the rotor and the eccentric counterclockwise.

Images