CN211527700U - Static pressure restrictor using fit clearance as throttle surface - Google Patents

Abstract

The utility model discloses an utilize static pressure flow controller of fit clearance as throttle face, including the flow controller body, the flow controller body passes through the screw thread cartridge on the lateral wall of hydro-cylinder end cover, and this internal axial perforating hole that has seted up of flow controller is as the pressure measurement centre bore, the direct static pressure oil blanket of front end of pressure measurement centre bore, the rear end of pressure measurement centre bore is sealed through the end cap, the flow controller mounting hole clearance fit on the front end excircle of flow controller body and the hydro-cylinder end cover forms the throttle circumferential weld, it has the static pressure feed port of perpendicular to flow controller body to open on the hydro-cylinder end cover, static pressure feed port, throttle circumferential weld, static pressure oil blanket communicate with each other in proper order. The hydraulic servo actuator is suitable for a high-performance hydraulic servo actuator cylinder, simplifies the processing difficulty, is convenient to disassemble and maintain, and improves the anti-blocking capability.

Description

Static pressure restrictor using fit clearance as throttle surface

Technical Field

The utility model relates to a test equipment technical field, concretely relates to a flow controller structure for on static pressure support cylinder.

Background

The high-performance hydraulic servo actuating cylinder commonly used in the test field mostly adopts static pressure support, and the static pressure support oil cylinder has extremely low starting pressure and running friction force and has great advantages in control precision, response frequency and durability compared with the common hydraulic actuating cylinder. The key element of the static pressure support oil cylinder is a restrictor, and the restrictors for the static pressure actuating cylinders at home and abroad mainly comprise small-hole throttling and capillary throttling. The small-hole throttleer realizes large flow resistance under small flow by processing a tiny hole on the throttleer, and the drift diameter is usually between 0.15 and 0.25 mm. The capillary restrictor realizes flow resistance by using a long capillary, and the pipe diameter is mostly 0.4-0.8 mm.

The orifice restrictor needs to be provided with small holes on the restrictor, requires good machining precision and consistency of the holes, needs to adopt special machining, has high requirements on equipment and has relatively high cost. The pressure measuring holes of the static pressure oil pad need to be processed independently by utilizing small hole throttling, so that the design of a more compact actuating cylinder is not facilitated. The small-hole throttler has poor pollutant accommodating capacity and is easy to block in the using process, so that the static pressure support of the actuating cylinder is invalid and damaged. The restrictor is generally installed through a flange surface of a cylinder end cover, when the cylinder is connected with other equipment through a flange, and the restrictor needs to be disassembled and repaired, firstly, the connecting part of the actuator and the equipment needs to be disassembled, and the part generally consumes larger workload and causes longer shutdown of the equipment.

The capillary restrictor is formed by rolling a capillary tube into a certain shape, is connected to a mounting surface and is mounted on an oil cylinder end cover through a mechanism. The capillary restrictor needs a large installation space, and an enough space needs to be designed on an end cover for installing the capillary restrictor; the connection of the capillary tube on the mounting surface usually needs vacuum brazing, special vacuum furnace equipment needs to be put into, the control requirement of the brazing process is high, a throttling hole cannot be blocked, the cooling temperature needs to be controlled, the tissue structure of the capillary tube material is protected, and the structural strength of the capillary tube is ensured. The existing capillary throttler is mostly arranged in the actuating cylinder, and when the capillary throttler needs to be replaced, the whole actuating cylinder needs to be disassembled and then replaced. Because the actuating cylinder is difficult to disassemble on site and the site pollution sources are more, the difficulty in replacing the throttler is very high, the whole throttler is transported back to a manufacturer for treatment, and the consumed time and the cost are more. The inner hole of the capillary restrictor is larger, and is improved compared with the small-hole restrictor, but the capillary restrictor has the possibility of blocking when facing larger impurity particles.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a static pressure flow controller that is used for high performance hydraulic pressure servo actuating cylinder (also called "static pressure support cylinder"), simplifies the processing degree of difficulty, and the maintenance is dismantled to the convenience, improves anti jam ability.

Therefore, the utility model discloses the technical scheme who adopts does: the utility model provides an utilize static pressure flow controller of fit clearance as throttle face, includes the flow controller body, the flow controller body passes through the screw thread cartridge on the lateral wall of hydro-cylinder end cover, and it has the axial perforating hole as the pressure measurement centre bore to open in the flow controller body, the direct static pressure oil pad of front end of pressure measurement centre bore, and the rear end of pressure measurement centre bore is sealed through the end cap, the flow controller mounting hole clearance fit formation throttle circumferential weld on the front end excircle of flow controller body and the hydro-cylinder end cover, it has the static pressure oil feed hole of perpendicular to flow controller body to open on the hydro-cylinder end cover, static pressure oil feed hole, throttle circumferential weld, static pressure oil pad communicate.

Preferably, the throttler body comprises a rod part extending into the oil cylinder end cover and an end head positioned outside the oil cylinder end cover, the rod part is a small round rod section, a middle round rod section and a thread section from front to back in sequence, adjacent two sections are in transition through an inclined plane, and the static pressure oil supply hole is over against a transition inclined plane between the small round rod section and the middle round rod section.

Preferably, a sealing gasket is arranged between the end head of the throttle body and the oil cylinder end cover, and the oil cylinder end cover is arranged on the sinking platform and used for installing the sealing gasket.

Preferably, the plug is an inner hexagonal plug. The installation is convenient, and the flow controller body can not protrude out of the end head.

The utility model has the advantages that:

(1) the throttling device integrates throttling and pressure measuring into a whole. The purpose of monitoring the pressure of the static pressure oil pad is realized by punching the inside of the throttler to be used as a pressure measuring hole of the static pressure oil pad. When throttling is needed, a plug is arranged, high-pressure oil passes through a static-pressure oil supply hole by a flow distribution ring, flows through a throttling ring seam and generates pressure drop, and the oil after pressure drop forms uniform pressure in a static-pressure oil pad and acts on a piston rod; when pressure measurement is needed, the plug is taken down, the pressure measurement joint is installed, and monitoring of the pressure of the static pressure oil pad is achieved.

(2) The throttler body is arranged on the side wall (also called radial surface) of the oil cylinder end cover, namely the throttler body can be directly arranged from the outer radial surface of the oil cylinder end cover. The throttle body can be directly taken down from the actuating cylinder when other parts are not detached, so that the throttle body is convenient to overhaul; meanwhile, the throttler does not need to be installed inside the actuating cylinder, so that an oil passage inside the actuating cylinder is simplified, and only one static pressure oil supply hole and a throttle installation hole need to be machined.

(3) The throttling ring seam formed by clearance fit is utilized for throttling, when larger impurity particles pass through the throttling ring seam, only one point is plugged, the whole annular surface is not easy to plug, and the structure is small in hole throttling or capillary throttling, so that the anti-plugging capability of the throttling device is improved.

(4) The throttling gap is machined in a matching mode, the outer circular surface of the throttling device can be machined by a common cylindrical grinding machine, the dimensional tolerance is very easy to guarantee, the consistency of the fit clearance is further guaranteed, the whole structure can be completed by adopting general machine tool equipment, and the cost is low; the pressure measuring center hole is directly connected with the static pressure oil pad, and the pressure measuring oil hole does not need to be processed on the oil cylinder end cover, so that the structure of the oil cylinder end cover is simplified, and the processing difficulty is reduced.

Drawings

Fig. 1 is a top view of the present invention.

Fig. 2 is a partial front view of the present invention.

Detailed Description

The invention will be further described by way of examples with reference to the accompanying drawings:

referring to fig. 1 and 2, the static pressure restrictor using the fit clearance as a throttle surface mainly comprises a restrictor body 1, an oil cylinder end cover 2, a static pressure oil pad 4 and a plug 5.

The oil cylinder end cover 2 is installed on a static pressure supporting oil cylinder, the throttler body 1 is inserted on the side wall of the oil cylinder end cover 2 through threads, a throttler installing hole is formed in the side wall of the oil cylinder end cover 2, and the inner side end of the throttler installing hole is opposite to the static pressure oil pad 4. The oil cylinder end cover 2 and the static pressure oil pad 4 are indispensable parts on the existing static pressure support oil cylinder. Usually, four static pressure oil pads 4 are arranged in the cylinder end cover 2 in a circumferentially uniform manner, and each static pressure oil pad 4 is provided with a restrictor body 1.

The throttle body 1 is inserted into the throttle mounting hole and the throttle body and the throttle mounting hole are screwed together through threads. An axial through hole is arranged in the throttler body 1 to be used as a pressure measuring center hole 3. The front end of the pressure measuring center hole 3 is directly communicated with the static pressure oil pad 4, and the rear end of the pressure measuring center hole 3 is sealed by a plug 5.

The outer circle of the front end of the restrictor body 1 is in clearance fit with a restrictor mounting hole in the oil cylinder end cover 2 to form a restrictor annular seam 6, the oil cylinder end cover 2 is provided with a static pressure oil supply hole 7 perpendicular to the restrictor body 1, and the static pressure oil supply hole 7, the restrictor annular seam 6 and the static pressure oil pad 4 are communicated in sequence.

Preferably, the throttle body 1 is composed of a rod part extending into the cylinder end cover 2 and an end part positioned outside the cylinder end cover 2. The rod part is sequentially provided with a small round rod section, a middle round rod section and a thread section from front to back, the adjacent two sections are transited through an inclined plane, and the static pressure oil supply hole 7 is over against the transition inclined plane between the small round rod section and the middle round rod section.

In addition, a sealing gasket 8 is arranged between the end head of the throttler body 1 and the oil cylinder end cover 2, and the oil cylinder end cover 2 is arranged on a sinking platform and used for installing the sealing gasket 8.

The plug 5 is preferably a hexagon socket screw plug.

The static pressure oil pads 4 are arranged around the piston rods of the static pressure support oil cylinders, the throttler is used for controlling the pressure of the static pressure oil pads 4 on the static pressure support oil cylinders, and the lateral force borne by the piston rods of the static pressure support oil cylinders is counteracted through the pressure difference formed among the static pressure oil pads 4 in the four directions of the circumferences of the piston rods. The specific principle is as follows: high-pressure oil passes through the static pressure oil supply hole 7 by the flow distribution ring, flows through the throttling ring gap 6 and generates pressure drop, and the oil after pressure drop forms uniform pressure in the static pressure oil pad 4 and acts on the piston rod. The throttle ring seam 6 is formed by the clearance fit of the outer circle of the front end of the throttle body 1 and a throttle mounting hole on the oil cylinder end cover 2, the flow in the clearance is laminar flow, and the flow resistance can be calculated by a formula. A pressure measuring central hole 3 which is directly communicated with the static pressure oil pad 4 is processed on the throttler body 1, so that the pressure of the static pressure oil pad 4 can be accurately measured; the opening of the pressure measuring central hole 3 is provided with a plug 5, the plug 5 can be taken down during debugging and maintenance, and a pressure measuring joint is arranged, so that the pressure of the static pressure oil pad 4 can be monitored. The throttle body 1 and the throttle mounting hole formed on the side wall of the oil cylinder end cover 2 are screwed through threads to realize insertion connection and installation, and are sealed by a sealing gasket 8.

Claims (4)

1. A static pressure restrictor using fit clearance as a restrictor surface comprises a restrictor body (1), and is characterized in that: the flow controller is characterized in that the flow controller body (1) is inserted into the side wall of the oil cylinder end cover (2) through threads, an axial through hole is formed in the flow controller body (1) and serves as a pressure measuring center hole (3), a front end of the pressure measuring center hole (3) is directly connected with a static pressure oil pad (4), the rear end of the pressure measuring center hole (3) is sealed through a plug (5), a flow regulating annular seam (6) is formed by the clearance fit of a flow controller mounting hole in the excircle of the front end of the flow controller body (1) and the oil cylinder end cover (2), a static pressure oil supply hole (7) perpendicular to the flow controller body (1) is formed in the oil cylinder end cover (2), and the static pressure oil supply hole (7), the flow regulating annular seam (.

2. The static pressure restrictor using a fit clearance as a restrictor surface according to claim 1, wherein: the throttler body (1) comprises a rod part extending into the oil cylinder end cover (2) and an end head positioned outside the oil cylinder end cover (2), wherein the rod part is a small round rod section, a middle round rod section and a thread section from front to back in sequence, the adjacent two sections are in transition through an inclined plane, and the static pressure oil supply hole (7) is just opposite to a transition inclined plane between the small round rod section and the middle round rod section.

3. The static pressure restrictor using a fitting clearance as a restrictor surface according to claim 2, wherein: a sealing gasket (8) is arranged between the end of the throttler body (1) and the oil cylinder end cover (2), and the oil cylinder end cover (2) is arranged on the sinking platform and used for mounting the sealing gasket (8).

4. The static pressure restrictor using a fit clearance as a restrictor surface according to claim 1, wherein: the plug (5) adopts an inner hexagonal plug screw.

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