CN212004436U - Rotary valve with guide pressure release valve structure - Google Patents

Abstract

The utility model discloses a change valve of area direction relief valve structure, including changeing the valve body, be equipped with hydraulic oil high pressure import on changeing the valve body, hydraulic oil low pressure export, brake valve lever, direction formula relief valve is by the disk seat, direction formula case, return spring, the adjustment seat is constituteed, return spring is embedded inside direction formula case, direction formula case and disk seat chamber wall are clearance fit in addition, make the case ensure linear motion under the return spring effect, thereby it causes sealed face damage to reduce case non-linear motion, and reduce the probability of internal leakage, and then effectively reduce the service failure rate of changeing the valve.

Description

Rotary valve with guide pressure release valve structure

Technical Field

The utility model belongs to tipper oil accuse change valve field, especially a take direction function's relief valve for tipper change valve.

Background

The oil control rotary valve of the dumper is a control unit for controlling the flow direction of hydraulic oil to a hydraulic system. When the container is lifted, the rotary valve is rotated to a lifting position, the oil is fed into the oil cylinder and started, hydraulic oil in the hydraulic oil tank is pressurized through the self-absorption effect of the hydraulic gear pump, high-pressure hydraulic oil is pressed into the hydraulic oil cylinder through the rotary valve, the hydraulic oil cylinder is pushed to extend, and the container is lifted; when the packing box descends, the rotary valve is rotated to the descending position, the hydraulic oil cylinder contracts under the self-weight effect of the packing box, hydraulic oil in the hydraulic oil cylinder passes through the hydraulic oil pipe and the rotary valve and is pressed back to the hydraulic oil tank, and the packing box descends.

As shown in fig. 1, the structure of the dump truck oil control rotary valve (rotary valve type reversing valve) is as follows: including change valve body 1, be equipped with hydraulic oil high pressure import 2 on the change valve body, hydraulic oil low pressure export 3, brake valve 4, relief valve 5, the relief valve belongs to unusual switching element, only lead to the instantaneous rising of system pressure at hydraulic system pressure excess or dumper abnormal use, when exceeding the pressure value that the relief valve set for, open during change valve self protection, can reduce the risk that the user lifted when the transition overload through the relief valve, guarantee vehicle and personal safety, avoid unnecessary loss of property, be the component that can not lack.

When a fully loaded dump truck is in the lifting process, the hydraulic system comprises the following components: the hydraulic elements such as the gear pump, the hydraulic oil pipe, the reversing valve, the control valve and the hydraulic oil cylinder are all in a high-pressure state, if no pressure release valve is used for protection, under the condition that the system pressure is continuously increased, the pressure born by each key element is increased, the abrasion in the element is accelerated for a long time, the internal leakage is advanced, the normal lifting cannot be directly caused, and even the oil pipeline is broken, and the lifting is out of control.

Disclosure of Invention

For preventing user's overload and the illegal operation of unloading, the case constantly is partial to the striking to the pressure release mouth when improving the relief valve and frequently opening and close, prevents to cause the valve port to break up, the utility model provides a take commentaries on classics valve of direction relief valve structure promotes the reliable and stable nature of hydraulic system operation, ensures product quality.

In order to solve the technical problem, the technical scheme of the utility model is that: the utility model provides a change valve of area direction relief valve structure, includes changes the valve body, is equipped with hydraulic oil high pressure import, hydraulic oil low pressure export, brake valve lever on changing the valve body, its characterized in that: still include direction formula relief valve, direction formula relief valve is by the disk seat, direction formula case, return spring, the adjustment seat is constituteed, the disk seat sets up the valve intracavity on changeing the valve body, axial pressure release mouth and the internal high pressure channel intercommunication of commentaries on classics valve on the disk seat inner, the side pressure release hole of disk seat communicates with this internal low pressure channel of commentaries on classics valve, the leading end and the disk seat chamber wall clearance fit of direction formula case, the axial pressure release mouth of work end ability shutoff disk seat of direction formula case, return spring who is located the disk seat is used for pushing up tight case, the adjustment seat passes through the helicitic texture and is connected with the outer end of disk seat, the adjustment seat is used for adjusting return spring.

The technical scheme is further limited, the guide type valve core is a combination of a cylinder and a cone frustum, the side surface of the cylinder is in clearance fit with the wall of the valve core cavity of the pressure release valve through a shaft hole, the cylinder is used for guiding the valve core to do linear motion, and the conical surface of the cone frustum is used for plugging an axial valve port of the pressure release valve; be equipped with spacing chamber in the cylinder, return spring's one end embedding is to spacing intracavity.

The technical scheme is further improved, and an adjusting gasket is arranged between the adjusting seat and the return spring.

The technical scheme is further improved, and a sealing ring is arranged on the side surface of the inner end of the valve seat.

The technical scheme is further improved, and combined gaskets are arranged between the valve seat and the rotary valve body and between the adjusting seat and the valve seat.

The utility model discloses beneficial effect:

1. after-sale failure rate of the rotary valve with the traditional structure is 1-2%, through failure analysis of market claims, more than 80% of failure modes are in medium stop and self-reduction, the failure position of the internal structure of the rotary valve is reflected to be caused by untight leakage of the seal of a valve core and a pressure relief opening of a pressure relief valve, and after the rotary valve is optimized to be the structure of the rotary valve, the after-sale failure rate can be reduced by about 70%;

2. the structure of the utility model is subjected to a simulation impact test, so that the risk of valve body damage caused by misoperation of a user is solved to a great extent;

3. the utility model discloses can effectively promote change valve life, guarantee system operation's smooth and easy performance effectively reduces hydraulic system's fault rate, and this structure has simple process, advantage with low costs, convenient to popularize and apply.

Drawings

Fig. 1 is a schematic diagram of a structure in the background art.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a sectional view of the pilot operated relief valve and rotary valve assembly of fig. 2.

Fig. 4 is a cross-sectional view of the middle guide type pressure relief valve of the present invention.

Fig. 5 is a sectional view of the middle guide type valve core of the present invention.

Detailed Description

As shown in fig. 2, 3 and 4, a rotary valve with a guiding relief valve structure comprises a rotary valve body, a hydraulic oil high pressure inlet 2, a hydraulic oil low pressure outlet 3, a control handle 4 and a guiding relief valve 6 are arranged on the rotary valve body, the guiding relief valve is composed of a valve seat 601, a guiding valve core 602, a return spring 603 and an adjusting seat 604, internal threads are arranged in the rotary valve body, the valve seat is fastened in the rotary valve body through threads, an axial relief port 6011 on the inner end of the valve seat is communicated with a high pressure channel 101 in the rotary valve body, a side relief hole 6012 of the valve seat is communicated with a low pressure channel 102 in the rotary valve body, a guiding end of the guiding valve core is in clearance fit with a cavity wall of the valve seat, a working end of the guiding valve core can seal the axial relief port of the valve seat, the return spring in the valve seat is used for abutting against the valve core, the adjusting seat is connected with the outer end of the, the adjusting seat has the advantages of simple structure, low production cost and convenient assembly and disassembly;

as shown in fig. 4 and 5, the guiding valve core is a combination of a cylinder 6021 and a truncated cone 6022 (i.e., the cylinder and the truncated cone are an integral structure), the side surface of the cylinder is in clearance fit with the cavity wall of the valve core of the pressure release valve through a shaft hole, the cylinder is used for guiding the valve core to move linearly, the conical surface of the truncated cone is used for plugging the axial valve port of the pressure release valve, and the axial pressure release port on the valve seat is matched with the truncated cone; a limiting cavity is arranged in the cylinder, and one end of the return spring is embedded into the limiting cavity to ensure that the spring does not shift when the guide type valve core moves; the advantages of this structure are: the cylinder is in clearance fit with the wall of the valve seat cavity, the swing of the guide valve core in the motion process is limited, the linear motion state of the valve core is ensured in the whole motion process, the structure is simple, and the production cost is low;

as shown in fig. 4 and 5, an adjusting shim 605 is arranged between the adjusting seat and the return spring, and the adjusting shim is used for preventing the return spring from swinging;

as shown in fig. 4 and 5, a sealing ring 606 is arranged on the side surface of the inner end of the valve seat, and is used for eliminating a gap between the valve seat and the rotary valve body and preventing hydraulic oil from leaking through the threaded connection part;

as shown in fig. 4 and 5, a combination washer 607 is provided between the valve seat and the rotary valve body and between the adjusting seat and the valve seat, and the combination washer is used for sealing the connection thread between the parts.

The utility model discloses the theory of operation: in an initial state, the guide type valve core is pressed in the valve seat through the return spring and the adjusting seat and continuously sealed with the axial pressure relief port, and the guide type valve core ensures that hydraulic oil circulates in the system under the elastic action of the return spring, so that the container is normally lifted and descended. When the pressure of the system exceeds the elastic force of the return spring, hydraulic oil in the high-pressure channel pushes the guide type valve core to axially slide along the valve seat to compress the return spring, and the hydraulic oil in the high-pressure channel sequentially flows into the low-pressure channel through the axial pressure relief opening and the radial pressure relief hole, so that the pressure relief is realized; when the pressure of the system is recovered to the normal pressure, the return spring pushes the guide type valve core to reset, and the system is normally lifted.

The utility model provides a return spring compares in prior art with the assembly structure of direction formula case and changes. The return spring is embedded in the guide type valve core, and the guide type valve core is in clearance fit with the wall of the valve seat cavity, so that the valve core can ensure linear motion under the action of the return spring, the damage of a sealing surface caused by nonlinear motion of the valve core is reduced, the probability of internal leakage is reduced, and the service failure rate of the rotary valve is effectively reduced.

Where not described in detail herein, the structures are clearly shown in the drawings and are known in the art.

Claims (5)

1. The utility model provides a change valve of area direction relief valve structure, includes changes the valve body, is equipped with hydraulic oil high pressure import, hydraulic oil low pressure export, brake valve lever on changing the valve body, its characterized in that: still include direction formula relief valve, direction formula relief valve is by the disk seat, direction formula case, return spring, the adjustment seat is constituteed, the disk seat sets up the valve intracavity on changeing the valve body, axial pressure release mouth and the internal high pressure channel intercommunication of commentaries on classics valve on the disk seat inner, the side pressure release hole of disk seat communicates with this internal low pressure channel of commentaries on classics valve, the leading end and the disk seat chamber wall clearance fit of direction formula case, the axial pressure release mouth of work end ability shutoff disk seat of direction formula case, return spring who is located the disk seat is used for pushing up tight case, the adjustment seat passes through the helicitic texture and is connected with the outer end of disk seat, the adjustment seat is used for adjusting return spring.

2. The rotary valve with the guide pressure relief valve structure according to claim 1, characterized in that: the guide type valve core is a combination of a cylinder and a cone frustum, the side surface of the cylinder is in clearance fit with the wall of the valve core cavity of the pressure release valve through a shaft hole, the cylinder is used for guiding the valve core to move linearly, and the cone surface of the cone frustum is used for plugging an axial valve port of the pressure release valve; be equipped with spacing chamber in the cylinder, return spring's one end embedding is to spacing intracavity.

3. A rotary valve with a guide pressure relief valve structure according to claim 1 or 2, characterized in that: an adjusting gasket is arranged between the adjusting seat and the return spring.

4. The rotary valve with the guide pressure relief valve structure according to claim 3, characterized in that: and a sealing ring is arranged on the side surface of the inner end of the valve seat.

5. A rotary valve with a guide pressure relief valve structure according to claim 1, 2 or 4, characterized in that: and combined gaskets are arranged between the valve seat and the rotary valve body and between the adjusting seat and the valve seat.

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