Hydraulic fault diagnosis and maintenance of rubber briquetting machine
Hydraulic fault diagnosis and maintenance of rubber briquetting machine
(1) Hydraulic system of rubber briquetting machine
According to the working requirements of the rubber posttreatment production line, the hydraulic system of the rubber briquetting machine adopts twoway cartridge valve circuit, the components adopt pressure seal, and the action test is completed on the processing site. The hydraulic system is shown in Figure o. The twoway cartridge valve circuit can realize the differential quick action of the hydraulic cylinder. It can adjust the function according to the actual production requirements, and also can easily adjust the action sequence of each hydraulic cylinder.
(2) Fault diagnosis and search of pump motor unit
According to table a, the search decision matrix is
Search cost and failure probability ranking of failure causes



Zij=yij i=1,2,···,n; j=1,2,···,m (C)
Normalize the matrix according to formula (c)
If the estimates of bij (I, j = 1, 2,..., m) are consistent, then
If the estimates of bij are inconsistent, then
The weight {W1, W2,..., WM) in equation (28) is constrained by
The differential of the above formula to W is obtained
Xij =WjZij i=1，2，…，n； j=l，2，…，m
The weighted normalized search decision matrix is obtained
x*={（max Xij）j∈Ji=1,2,···,n} (213)
X ={ (min Xij) j∈Jli=l,2，…，n} (214)
The distances from each solution to the ideal solution and the negative ideal solution are
The relative closeness of each solution to the ideal solution is
Ei* =Di/(Di+Di*) O≤Ei*≤1 (216)
The distances from each solution to ideal solution and negative ideal solution are
The relative closeness of each solution to the ideal solution is
Ei*={0.212,0,0.449,0.449, 0.587,0.587,1,0.813,1,0.813}