阅读说明：本技术 一种负载记忆阀 (A kind of load memory valve ) 是由 姚平喜 耿虎详 张晶晶 王永玲 袁宏伟 杨立斌 杨旭东 于 2019-09-04 设计创作，主要内容包括：本发明涉及一种负载记忆阀,包括端盖、阀座、控制活塞、阀芯、阀芯复位弹簧、控制活塞复位弹簧、阀体、压力记忆阀芯、压力比较阀芯、调压弹簧、微动开关推杆、压块推杆、微动开关导向块、微动开关、压块、微动开关触头、进油口和控制油口；通过所述进油口通入的压力油同时作用于压力记忆阀芯和压力比较阀芯的下端,并且前述两者分别与调压弹簧的弹簧力平衡。采用负载记忆阀可以有效解决二次起升下滑问题,起升时负载产生的压力由压力记忆阀芯的位置确定,二次起升时,只有起升压力把压力比较阀芯推到对应位置时,微动开关才会发出信号,制动器才会打开,且本负载记忆阀结构简单,实现容易,可靠性高。(The present invention relates to a kind of load memory valves, including end cap, valve seat, control piston, spool, valve core reseting spring, control piston reset spring, valve body, pressure memory spool, pressure to compare spool, pressure spring, microswitch push rod, briquetting push rod, microswitch guide pad, microswitch, briquetting, microswitch contact, oil inlet and control port；The pressure oil that is passed through by the oil inlet while acting on pressure memory spool and pressure compares the lower end of spool, and it is both aforementioned respectively with the spring dynamic balance of pressure spring.Secondary lifting and sliding can effectively be solved the problems, such as using load memory valve, the pressure that load generates when raising is determined by the position of pressure memory spool, when secondary lifting, when only pressure is compared spool and shifts corresponding position by raising pressure, microswitch can just issue signal, and brake can just be opened, and this load memory valve arrangement is simple, it realizes and is easy, high reliablity.)

1. a kind of load memory valve, including end cap (1), valve seat (2), control piston (3), spool (4), valve core reseting spring (5), Control piston reset spring (6), valve body (7), pressure memory spool (8), pressure compare spool (9), pressure spring (10), fine motion Switch plunger (11), briquetting push rod (12), microswitch guide pad (13), microswitch (14), briquetting (15), microswitch Contact (16), oil inlet (A) and control port (K), it is characterised in that；

The pressure oil that is passed through by the oil inlet (A) while acting on pressure memory spool (8) and pressure compares spool (9) Lower end, and both aforementioned spring dynamic balance with pressure spring (10) respectively；

The top that pressure memory spool (8) and pressure compare spool (9) has been correspondingly connected with microswitch push rod (11) and pressure The top of block push rod (12), the microswitch push rod (11) is connected with microswitch guide pad (13), the briquetting push rod (12) top is connected with briquetting (15)；

It is passed through pressure oil by the control port (K), control piston reset spring (6) and pushes control piston (3), the valve Core (4) opens the pressure oil of control pressure memory spool (8) lower end by the oil inlet (A) pressure release, and the microswitch Push rod (11) pushes microswitch (14) to do descending motion.

2. a kind of load memory valve according to claim 1, which is characterized in that the bottom of the valve seat (2) is equipped with end It covers (1), and the top of valve seat (2) is provided with valve body (7) and control piston (3), the spool (4) is mounted on control piston (3) Inner cavity.

3. a kind of load memory valve according to claim 2, which is characterized in that the spool 4 is cone valve structure, and spool (4) valve core reseting spring (5) are provided on.

4. a kind of load memory valve according to claim 1, which is characterized in that pressure memory spool (8) and pressure Compare the lower reaction area equation of spool (9).

5. a kind of load memory valve according to claim 1, which is characterized in that the pressure spring (10) totally two, and Parameter is identical.

6. a kind of load memory valve according to claim 1, which is characterized in that the microswitch push rod (11) and described Briquetting push rod (12) is parallel to each other and in the same plane.

7. a kind of load memory valve according to claim 1, which is characterized in that one end of the microswitch (14) is arranged Have microswitch contact (16), and microswitch contact (16) contacts with each other with briquetting (15).

Technical field

The present invention relates to the open hydraulic raisings of a kind of load memory valve, the jack up unit applied to hydraulic motor driving to return Lu Zhong, after capable of preventing jack up unit from staying for some time during loading raising when raising again, it may occur however that moment lose Control roll-off.The jack up unit for preventing hydraulic motor from driving more particularly, to a kind of operation by control brake Memory valve is loaded used in the hydraulic control system for secondary lifting and sliding occur.

Background technique

The jack up unit of hydraulic motor driving is for setting object from the machinery of position transfer to another position It is standby, in transfer process, necessarily involve the promotion of object.In raising operating process, the most common problem is " secondary Rise and glide " problem." secondary lifting and sliding ", which refers to, works as after weight stays for some time second of (or third time during raising Deng) lifted by crane again when, weight often could normal raising because being self-possessed first downslide a distance.This phenomenon can when serious It can cause serious accident.

With jack up unit, such as the application of crane, hoisting gear is increasingly extensive, hoisting weight is increasing, raising The security performance of device is also increasingly taken seriously.Accordingly, due to the serious shadow of " secondary lifting and sliding " problem of jack up unit The safety for arriving jack up unit is rung, therefore is also increasingly subject to the close attention of people.To solve " under secondary lifting of jack up unit Cunning " problem, the prior art mainly use following three kinds of technical solutions:

First, when being promoted, the delay regular hour again opens brake in such a way that brake is delayed logical oil；The party Formula can also have the trend of double slide when loading bigger；When loading smaller, it can make raising pressure is very high just to open system Dynamic device, will cause the preshoot phenomenon of hoisting system, the i.e. unexpected acceleration of moment.

Second, using the pressure memory system being made of accumulator and check valve, such as Chinese utility model patent CN2040896U remembers the load gravity of lifting, when carrying out secondary hoisting operation, only raising driving force reach or The on-position of brake is just released when greater than last time load gravity, to realize the function of preventing secondary lifting and sliding；It is this The defect of technical solution is: due to increasing accumulator, more flows is needed in the first raising of jack up unit, and only store When energy device pressurising reaches the pressure of raising load, load weight just can raising；When reverse operating, it is also desirable to first the pressure of accumulator It could be moved after power release.

Third, using including load gravity sensor, driving rate-of-change sensor, electronic control unit and brake driving The anti-secondary lifting and sliding system of device；Such as patent of invention WO2011120393A1, wherein the load gravity sensor detection The load gravity of the crane, and load gravity signal is transferred to the electronic control unit, the driving variable sensing Device detects driving variable signal relevant to the raising driving force of the crane, and the driving variable signal is transferred to institute Electronic control unit is stated, the electronic control unit calculates the value of the raising driving force according to driving variable signal, and will The value of the raising driving force is compared with the load gravity signal, when the load gravity is equal to the raising driving force When, the electronic control unit controls the brake driver gear, so that the brake of the crane releases braking shape State；This scheme can be accurately controlled, and reached and solved the problems, such as " secondary lifting and sliding "；But due to the biography for increasing more " fragile " Sensor, electronic control unit etc., the ability for adapting to adverse circumstances necessarily decline, and system complex makes the reduction of its reliability.

Therefore, it is necessary to a kind of device and method that can effectively solve the problem that jack up unit secondary lifting and sliding problem, the devices Should not only have universal applicability, but also simple and practical.

Summary of the invention

The shortcomings that the purpose of the present invention is to solve jack up unit secondary lifting and sliding problems existing in the prior art, And a kind of load memory valve proposed.

To achieve the goals above, present invention employs following technical solutions:

A kind of load memory valve, including end cap, valve seat, control piston, spool, valve core reseting spring, control piston reset spring, Valve body, pressure memory spool, pressure compare spool, pressure spring, microswitch push rod, briquetting push rod, microswitch guide pad, Microswitch, briquetting, microswitch contact, oil inlet and control port；

The pressure oil that is passed through by the oil inlet while acting on pressure memory spool and pressure compares the lower end of spool, and It is both aforementioned respectively with the spring dynamic balance of pressure spring；

The top that the pressure memory spool and pressure compare spool has been correspondingly connected with microswitch push rod and briquetting push rod, described The top of microswitch push rod is connected with microswitch guide pad, and the top of the briquetting push rod is connected with briquetting；

It is passed through pressure oil by the control port, control piston reset spring and pushes control piston, the spool opens control Pressing pressure remembers the pressure oil of spool lower end by the oil inlet pressure release, and the microswitch push rod pushes microswitch to do Descending motion.

Preferably, the bottom of the valve seat is equipped with end cap, and the top of valve seat is provided with valve body and control piston, described Spool is mounted on the inner cavity of control piston.

Preferably, the spool is cone valve structure, and valve core reseting spring is provided on spool.

Preferably, the pressure memory spool and pressure compare the lower reaction area equation of spool.

Preferably, the pressure spring totally two, and parameter is identical.

Preferably, the microswitch push rod and the briquetting push rod are parallel to each other and in the same plane.

Preferably, one end of the microswitch is provided with microswitch contact, and microswitch contact and briquetting are mutual Contact.

The beneficial effects of the present invention are:

1, of the invention, by offering oil inlet and control port on the valve body of load memory valve, when oil inlet is passed through pressure When oily, pressure oil acts on the lower end of pressure memory spool, and castering action compares the lower end of spool in pressure, respectively with pressure regulation bullet The spring dynamic balance of spring pushes microswitch push rod and briquetting push rod to move on to same position on simultaneously；Stop when during raising When staying, spool is closed under the action of valve core reseting spring, and pressure remembers the pressure oil closing of spool lower end, microswitch push rod It keeps in situ, plays the role of memory load；When needing secondary lifting, with the raising of pressure oil pressure, briquetting is pushed Push rod constantly moves up, and until briquetting is pressed onto microswitch contact, microswitch issues signal, and notice brake is opened.

2, the present invention can effectively solve the problems, such as secondary lifting and sliding using load memory valve, the pressure that load generates when raising Power is determined by the position of pressure memory spool, and when secondary lifting, pressure is compared spool and shifts corresponding position by only raising pressure When, microswitch can just issue signal, and brake can just be opened, and this load memory valve arrangement is simple, realizes and is easy, reliability It is high.

Detailed description of the invention

Fig. 1 is a kind of normality schematic diagram for loading memory valve proposed by the present invention；

Fig. 2 is the status diagram before a kind of secondary lifting for loading memory valve proposed by the present invention；

Fig. 3 is the shape in a kind of normal raising work for loading memory valve proposed by the present invention or when secondary lifting opening brake State schematic diagram；

Fig. 4 is a kind of application examples schematic diagram in motor hoisting circuit for loading memory valve proposed by the present invention.

In figure: 1 end cap, 2 valve seats, 3 control pistons, 4 spools, 5 valve core reseting springs, 6 control piston reset springs, 7 valves Body, the memory of 8 pressure spool, 9 pressure compare spool, 10 pressure springs, 11 microswitch push rods, 12 briquetting push rods, 13 fine motions are opened Close guide pad, 14 microswitches, 15 briquettings, 16 microswitch contacts, 17 hydraulic pumps, 18 overflow valves, 19 three position four-way directional control valves, 20 balanced valves, 21 hydraulic motors, 22 checking cylinders, 23 two position three way directional control valves, A oil inlet, K control port.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.