阅读说明：本技术 变速操纵阀 (Variable speed operating valve ) 是由 邹爱标 邹云斌 刘招 于 2020-05-22 设计创作，主要内容包括：本发明公开了一种变速操纵阀。包括阀体,设于所述阀体的安装壁面,设于所述安装壁面的若干工作压力油槽,以及若干回流油槽,所述阀体的安装壁面还设有对应于所述工作压力油槽的回泄油槽,所述回泄油槽分别设有与回流油槽连接的排泄口。该变速操纵阀可以有效防止外渗漏,运行密封性能好,且结构简单、合理。(The invention discloses a variable speed operating valve. Including the valve body, locate the installation wall of valve body locates a plurality of operating pressure oil grooves of installation wall to and a plurality of backward flow oil groove, the installation wall of valve body still be equipped with corresponding to the oil drainage groove returns of operating pressure oil groove, it is equipped with the drain outlet of being connected with the backward flow oil groove respectively to return the oil drainage groove. The variable speed control valve can effectively prevent external leakage, has good operation sealing performance and simple and reasonable structure.)

1. The utility model provides a variable speed operating valve, includes the valve body, locates the installation wall of valve body is located a plurality of operating pressure oil grooves of installation wall to and a plurality of backward flow oil groove, characterized by the installation wall of valve body still be equipped with corresponding to the oil drainage groove returns of operating pressure oil groove, it is equipped with the escape orifice of being connected with the backward flow oil groove respectively to return the oil drainage groove.

Technical Field

The invention relates to engineering machinery, in particular to a variable speed control valve for a walking hydraulic system of the engineering machinery.

Background

In the existing variable speed control valve for a loader traveling hydraulic system, because an oil path is exposed on an installation surface, the installation surface is connected with a gearbox box body through a paper pad, after oil is introduced into an oil duct, oil is sealed mainly by the paper pad and the installation surface of the variable speed control valve, and because the area of the installation surface of the variable speed control valve is large (242 mm × 236 mm), in practice, local relative uneven points still exist after the installation surface of the variable speed control valve is finished, pressure oil leaks outwards from the uneven points, oil leakage faults of the variable speed control valve are caused, a certain degree of influence is caused on normal operation, and great complaints are made by users.

Disclosure of Invention

The present invention is directed to solving the above-mentioned problems of the prior art and to providing a variable speed control valve. The variable speed control valve can effectively prevent external leakage, has good operation sealing performance and simple and reasonable structure.

The technical scheme of the variable speed control valve comprises a valve body, a mounting wall surface arranged on the valve body, a plurality of working pressure oil grooves arranged on the mounting wall surface, and a plurality of backflow oil grooves, wherein the mounting wall surface of the valve body is also provided with oil return grooves corresponding to the working pressure oil grooves, and the oil return grooves are respectively provided with a drain outlet connected with the backflow oil grooves.

The variable-speed control valve is simple and reasonable in structure, on one hand, leaked oil is returned to a low-pressure area through the oil return groove by a technical means of arranging the oil return groove on the periphery of the pressure oil path, so that the oil leakage fault is avoided, and the influence on the environment, parts and normal operation of related parts is avoided; on the other hand, the machining precision of the installation surface of the variable speed control valve is relatively reduced, and the machining process is simplified. It is particularly simple and practical.

Drawings

Fig. 1 is a schematic view of a valve body mounting wall surface structure of an embodiment of the shift operating valve.

Detailed Description

In order to facilitate a better understanding of the invention, the invention is further illustrated by the following examples in conjunction with the accompanying drawings.

As shown in fig. 1. The variable-speed operating valve is characterized in that oil return grooves are correspondingly formed in corresponding sides or corresponding peripheries of all working pressure oil grooves (or high-pressure oil areas) on the mounting surface of the valve body respectively, a drain outlet is formed nearby the oil return grooves, and leaked oil return of the working pressure oil grooves is drained nearby the corresponding oil return grooves.

The valve body of the variable speed control valve comprises a mounting wall surface K, wherein the mounting wall surface K is respectively provided with a main working pressure oil groove 2a, a side working pressure oil groove (local working pressure oil groove) 2b positioned at a corresponding corner of the valve body, a main return oil groove 4a, a local return oil groove (low pressure oil area or non-pressure oil area) 4b and the like. And a local oil return groove 1b corresponding to one corresponding end of the main working pressure oil groove and a main oil return groove 1a corresponding to the other end of the main working pressure oil groove are also formed in the mounting wall surface of the valve body. The main oil return groove is respectively provided with a left discharge port a connected to one end of the main oil return groove, a middle discharge port b connected to the corresponding middle part of the main oil return groove, and a right discharge port c connected to the local oil return groove. The local oil return groove is provided with a local drain outlet d connected with the local oil return groove.

The valve body is provided with a mounting wall surface corresponding to the oil groove, and is hermetically connected with the corresponding wall surface of the gearbox through a paper pad, so that the oil grooves under the working pressure, the oil return grooves and the oil return grooves of the valve body respectively form corresponding oil passages. Under the working state, the pressure oil of the gearbox enters each corresponding working oil passage to form a working high-pressure oil area. And the return oil duct forms a low-pressure oil area to return the low-pressure working return oil of the valve body to the oil tank. The oil return passage is arranged on one side corresponding to the working pressure oil groove in a surrounding mode, and the leaked oil outside the working high-pressure oil area is recovered to the low-pressure return oil passage. Although the structure mode is extremely simple, the leakage prevention device is effective and practical.