 |
产品详细资料 |
|
 |
DB DT DF Matching scheme Bearing |
|
|
|
| 型号: |
| The main purpose for applying a preload
to machine tool spindle bearings is to
increase their rigidity, improve running
accuracy, and prevent sliding of the
rolling elements at high speed. Usually a
preload is applied to bearings by using
two or more in combination, such as
angular contact ball bearings or tapered
roller bearings. Cylindrical roller bearings
can be preloaded by making the radial
internal clearance slightly negative. |
|
订货电话：0312-5920850 5920866 |
|
| Item |
Size |
Weight |
| 7032AC/DT |
160*240*76 |
10.52 |
| 7032AC/DF |
160*240*76 |
10.52 |
| 7032AC/DB |
160*240*76 |
10.52 |
| 7032C/DT |
160*240*76 |
10.52 |
| 7032C/DF |
160*240*76 |
10.52 |
| 7032C/DB |
160*240*76 |
10.52 |
| 7030AC/DT |
150*225*70 |
9.6 |
| 7030AC/DF |
150*225*70 |
9.6 |
| 7030AC/DB |
150*225*70 |
9.6 |
| 7030C/DT |
150*225*70 |
9.6 |
| 7030C/DF |
150*225*70 |
9.6 |
| 7030C/DB |
150*225*70 |
9.6 |
| 7028AC/DT |
140*210*66 |
6.92 |
| 7028AC/DF |
140*210*66 |
6.92 |
| 7028AC/DB |
140*210*66 |
6.92 |
| 7028C/DT |
140*210*66 |
6.92 |
| 7028C/DF |
140*210*66 |
6.92 |
| 7028C/DB |
140*210*66 |
6.92 |
| 7226B/DT |
130*230*80 |
12.1 |
| 7226B/DF |
130*230*80 |
12.1 |
| 7226B/DB |
130*230*80 |
12.1 |
| 7226AC/DT |
130*230*80 |
12.9 |
| 7226AC/DF |
130*230*80 |
12.9 |
| 7226AC/DB |
130*230*80 |
12.9 |
| 7226C/DT |
130*230*80 |
12.9 |
| 7226C/DF |
130*230*80 |
12.9 |
| 7226C/DB |
130*230*80 |
12.9 |
| 7026AC/DT |
130*200*66 |
6.66 |
| 7026AC/DF |
130*200*66 |
6.66 |
| 7026AC/DB |
130*200*66 |
6.66 |
| 7026C/DT |
130*200*66 |
6.66 |
| 7026C/DF |
130*200*66 |
6.66 |
| 7026C/DB |
130*200*66 |
6.66 |
| 7224B/DT |
120*215*80 |
10.8 |
| 7224B/DF |
120*215*80 |
10.8 |
| 7224B/DB |
120*215*80 |
10.8 |
| 7224AC/DT |
120*215*80 |
10.8 |
| 7224AC/DF |
120*215*80 |
10.8 |
| 7224AC/DB |
120*215*80 |
10.8 |
| 7224C/DT |
120*215*80 |
10.8 |
| 7224C/DF |
120*215*80 |
10.8 |
| 7224C/DB |
120*215*80 |
10.8 |
| 7024AC/DT |
120*180*56 |
4.2 |
| 7024AC/DF |
120*180*56 |
4.2 |
| 7024AC/DB |
120*180*56 |
4.2 |
| 7024C/DT |
120*180*56 |
4.2 |
| 7024C/DF |
120*180*56 |
4.2 |
| 7024C/DB |
120*180*56 |
4.2 |
| 7322B/DT |
110*240*100 |
19.78 |
| 7322B/DF |
110*240*100 |
19.78 |
| 7322B/DB |
110*240*100 |
19.78 |
| 7322AC/DT |
110*240*100 |
21 |
| 7322AC/DF |
110*240*100 |
21 |
| 7322AC/DB |
110*240*100 |
21 |
| 7322C/DT |
110*240*100 |
21 |
| 7322C/DF |
110*240*100 |
21 |
| 7322C/DB |
110*240*100 |
21 |
| 7222B/DT |
110*200*76 |
9.1 |
| 7222B/DF |
110*200*76 |
9.1 |
| 7222B/DB |
110*200*76 |
9.1 |
| 7222AC/DT |
110*200*76 |
9.1 |
| 7222AC/DF |
110*200*76 |
9.1 |
| 7222AC/DB |
110*200*76 |
9.1 |
| 7222C/DT |
110*200*76 |
9.1 |
| 7222C/DF |
110*200*76 |
9.1 |
| 7222C/DB |
110*200*76 |
9.1 |
| 7022AC/DT |
110*170*56 |
3.9 |
| 7022AC/DF |
110*170*56 |
3.9 |
| 7022AC/DB |
110*170*56 |
3.9 |
| 7022C/DT |
110*170*56 |
3.9 |
| 7022C/DF |
110*170*56 |
3.9 |
| 7022C/DB |
110*170*56 |
3.9 |
| 7321B/DT |
105*225*98 |
17.1 |
| 7321B/DF |
105*225*98 |
17.1 |
| 7321B/DB |
105*225*98 |
17.1 |
| 7321AC/DT |
105*225*98 |
17.7 |
| 7321AC/DF |
105*225*98 |
17.7 |
| 7321AC/DB |
105*225*98 |
17.7 |
| 7321C/DT |
105*225*98 |
17.7 |
| 7321C/DF |
105*225*98 |
17.7 |
| 7321C/DB |
105*225*98 |
17.7 |
| 7221B/DT |
105*190*72 |
7.7 |
| 7221B/DF |
105*190*72 |
7.7 |
| 7221B/DB |
105*190*72 |
7.7 |
| 7221AC/DT |
105*190*72 |
7.7 |
| 7221AC/DF |
105*190*72 |
7.7 |
| 7221AC/DB |
105*190*72 |
7.7 |
| 7221C/DT |
105*190*72 |
7.7 |
| 7221C/DF |
105*190*72 |
7.7 |
| 7221C/DB |
105*190*72 |
7.7 |
| 7021AC/DT |
105*160*52 |
3.2 |
| 7021AC/DF |
105*160*52 |
3.2 |
| 7021AC/DB |
105*160*52 |
3.2 |
| 7021C/DT |
105*160*52 |
3.2 |
| 7021C/DF |
105*160*52 |
3.2 |
| 7021C/DB |
105*160*52 |
3.2 |
| 7320B/DT |
100*215*94 |
14.58 |
| 7320B/DF |
100*215*94 |
14.58 |
| 7320B/DB |
100*215*94 |
14.58 |
| 7320AC/DT |
100*215*94 |
15.16 |
| 7320AC/DF |
100*215*94 |
15.16 |
| 7320AC/DB |
100*215*94 |
15.16 |
| 7320C/DT |
100*215*94 |
15.16 |
| 7320C/DF |
100*215*94 |
15.16 |
| 7320C/DB |
100*215*94 |
15.16 |
| 7220B/DT |
100*180*68 |
6.6 |
| 7220B/DF |
100*180*68 |
6.6 |
| 7220B/DB |
100*180*68 |
6.6 |
| 7220AC/DT |
100*180*68 |
6.5 |
| 7220AC/DF |
100*180*68 |
6.5 |
| 7220AC/DB |
100*180*68 |
6.5 |
| 7220C/DT |
100*180*68 |
6.5 |
| 7220C/DF |
100*180*68 |
6.5 |
| 7220C/DB |
100*180*68 |
6.5 |
| 7020AC/DT |
100*150*48 |
2.5 |
| 7020AC/DF |
100*150*48 |
2.5 |
| 7020AC/DB |
100*150*48 |
2.5 |
| 7020C/DT |
100*150*48 |
2.5 |
| 7020C/DF |
100*150*48 |
2.5 |
| 7020C/DB |
100*150*48 |
2.5 |
| 7319B/DT |
95*200*90 |
12.8 |
| 7319B/DF |
95*200*90 |
12.8 |
| 7319B/DB |
95*200*90 |
12.8 |
| 7319AC/DT |
95*200*90 |
13.2 |
| 7319AC/DF |
95*200*90 |
13.2 |
| 7319AC/DB |
95*200*90 |
13.2 |
| 7319C/DT |
95*200*90 |
13.2 |
| 7319C/DF |
95*200*90 |
13.2 |
| 7319C/DB |
95*200*90 |
13.2 |
| 7219B/DT |
95*170*64 |
5.4 |
| 7219B/DF |
95*170*64 |
5.4 |
| 7219B/DB |
95*170*64 |
5.4 |
| 7219AC/DT |
95*170*64 |
5.4 |
| 7219AC/DF |
95*170*64 |
5.4 |
| 7219AC/DB |
95*170*64 |
5.4 |
| 7219C/DT |
95*170*64 |
5.4 |
| 7219C/DF |
95*170*64 |
5.4 |
| 7219C/DB |
95*170*64 |
5.4 |
| 7019AC/DT |
95*145*48 |
2.4 |
| 7019AC/DF |
95*145*48 |
2.4 |
| 7019AC/DB |
95*145*48 |
2.4 |
| 7019C/DT |
95*145*48 |
2.4 |
| 7019C/DF |
95*145*48 |
2.4 |
| 7019C/DB |
95*145*48 |
2.4 |
| 7418B/DT |
90*225*108 |
21.6 |
| 7418B/DF |
90*225*108 |
21.6 |
| 7418B/DB |
90*225*108 |
21.6 |
| 7418AC/DT |
90*225*108 |
22.4 |
| 7418AC/DF |
90*225*108 |
22.4 |
| 7418AC/DB |
90*225*108 |
22.4 |
| 7418C/DT |
90*225*108 |
22.4 |
| 7418C/DF |
90*225*108 |
22.4 |
| 7418C/DB |
90*225*108 |
22.4 |
| 7318B/DT |
90*190*86 |
10.6 |
| 7318B/DF |
90*190*86 |
10.6 |
| 7318B/DB |
90*190*86 |
10.6 |
| 7318AC/DT |
90*190*86 |
11.2 |
| 7318AC/DF |
90*190*86 |
11.2 |
| 7318AC/DB |
90*190*86 |
11.2 |
| 7318C/DT |
90*190*86 |
11.2 |
| 7318C/DF |
90*190*86 |
11.2 |
| 7318C/DB |
90*190*86 |
11.2 |
| 7218B/DT |
90*160*60 |
4.6 |
| 7218B/DF |
90*160*60 |
4.6 |
| 7218B/DB |
90*160*60 |
4.6 |
| 7218AC/DT |
90*160*60 |
4.5 |
| 7218AC/DF |
90*160*60 |
4.5 |
| 7218AC/DB |
90*160*60 |
4.5 |
| 7218C/DT |
90*160*60 |
4.5 |
| 7218C/DF |
90*160*60 |
4.5 |
| 7218C/DB |
90*160*60 |
4.5 |
| 7018AC/DT |
90*140*48 |
2.3 |
| 7018AC/DF |
90*140*48 |
2.3 |
| 7018AC/DB |
90*140*48 |
2.3 |
| 7018C/DT |
90*140*48 |
2.3 |
| 7018C/DF |
90*140*48 |
2.3 |
| 7018C/DB |
90*140*48 |
2.3 |
| 7417B/DT |
85*210*104 |
18.6 |
| 7417B/DF |
85*210*104 |
18.6 |
| 7417B/DB |
85*210*104 |
18.6 |
| 7417AC/DT |
85*210*104 |
19.2 |
| 7417AC/DF |
85*210*104 |
19.2 |
| 7417AC/DB |
85*210*104 |
19.2 |
| 7417C/DT |
85*210*104 |
19.2 |
| 7417C/DF |
85*210*104 |
19.2 |
| 7417C/DB |
85*210*104 |
19.2 |
| 7317B/DT |
85*180*82 |
8.9 |
| 7317B/DF |
85*180*82 |
8.9 |
| 7317B/DB |
85*180*82 |
8.9 |
| 7317AC/DT |
85*180*82 |
8.76 |
| 7317AC/DF |
85*180*82 |
8.76 |
| 7317AC/DB |
85*180*82 |
8.76 |
| 7317C/DT |
85*180*82 |
8.76 |
| 7317C/DF |
85*180*82 |
8.76 |
| 7317C/DB |
85*180*82 |
8.76 |
| 7217B/DT |
85*150*56 |
3.7 |
| 7217B/DF |
85*150*56 |
3.7 |
| 7217B/DB |
85*150*56 |
3.7 |
| 7217AC/DT |
85*150*56 |
3.6 |
| 7217AC/DF |
85*150*56 |
3.6 |
| 7217AC/DB |
85*150*56 |
3.6 |
| 7217C/DT |
85*150*56 |
3.6 |
| 7217C/DF |
85*150*56 |
3.6 |
| 7217C/DB |
85*150*56 |
3.6 |
| 7017AC/DT |
85*130*44 |
1.78 |
| 7017AC/DF |
85*130*44 |
1.78 |
| 7017AC/DB |
85*130*44 |
1.78 |
| 7017C/DT |
85*130*44 |
1.78 |
| 7017C/DF |
85*130*44 |
1.78 |
| 7017C/DB |
85*130*44 |
1.78 |
| 7416B/DT |
80*200*96 |
14.36 |
| 7416B/DF |
80*200*96 |
14.36 |
| 7416B/DB |
80*200*96 |
14.36 |
| 7416AC/DT |
80*200*96 |
14.8 |
| 7416AC/DF |
80*200*96 |
14.8 |
| 7416AC/DB |
80*200*96 |
14.8 |
| 7416C/DT |
80*200*96 |
14.8 |
| 7416C/DF |
80*200*96 |
14.8 |
| 7416C/DB |
80*200*96 |
14.8 |
| 7316B/DT |
80*170*78 |
7.6 |
| 7316B/DF |
80*170*78 |
7.6 |
| 7316B/DB |
80*170*78 |
7.6 |
| 7316AC/DT |
80*170*78 |
7.2 |
| 7316AC/DF |
80*170*78 |
7.2 |
| 7316AC/DB |
80*170*78 |
7.2 |
| 7316C/DT |
80*170*78 |
7.2 |
| 7316C/DF |
80*170*78 |
7.2 |
| 7316C/DB |
80*170*78 |
7.2 |
| 7216B/DT |
80*140*52 |
2.9 |
| 7216B/DF |
80*140*52 |
2.9 |
| 7216B/DB |
80*140*52 |
2.9 |
| 7216AC/DT |
80*140*52 |
2.9 |
| 7216AC/DF |
80*140*52 |
2.9 |
| 7216AC/DB |
80*140*52 |
2.9 |
| 7216C/DT |
80*140*52 |
2.9 |
| 7216C/DF |
80*140*52 |
2.9 |
| 7216C/DB |
80*140*52 |
2.9 |
| 7016AC/DT |
80*125*44 |
1.7 |
| 7016AC/DF |
80*125*44 |
1.7 |
| 7016AC/DB |
80*125*44 |
1.7 |
| 7016C/DT |
80*125*44 |
1.7 |
| 7016C/DF |
80*125*44 |
1.7 |
| 7016C/DB |
80*125*44 |
1.7 |
| 7415B/DT |
75*190*90 |
13.6 |
| 7415B/DF |
75*190*90 |
13.6 |
| 7415B/DB |
75*190*90 |
13.6 |
| 7415AC/DT |
75*190*90 |
14 |
| 7415AC/DF |
75*190*90 |
14 |
| 7415AC/DB |
75*190*90 |
14 |
| 7415C/DT |
75*190*90 |
14 |
| 7415C/DF |
75*190*90 |
14 |
| 7415C/DB |
75*190*90 |
14 |
| 7315B/DT |
75*160*74 |
6.4 |
| 7315B/DF |
75*160*74 |
6.4 |
| 7315B/DB |
75*160*74 |
6.4 |
| 7315AC/DT |
75*160*74 |
6.2 |
| 7315AC/DF |
75*160*74 |
6.2 |
| 7315AC/DB |
75*160*74 |
6.2 |
| 7315C/DT |
75*160*74 |
6.2 |
| 7315C/DF |
75*160*74 |
6.2 |
| 7315C/DB |
75*160*74 |
6.2 |
| 7215B/DT |
75*130*50 |
2.4 |
| 7215B/DF |
75*130*50 |
2.4 |
| 7215B/DB |
75*130*50 |
2.4 |
| 7215AC/DT |
75*130*50 |
2.4 |
| 7215AC/DF |
75*130*50 |
2.4 |
| 7215AC/DB |
75*130*50 |
2.4 |
| 7215C/DT |
75*130*50 |
2.4 |
| 7215C/DF |
75*130*50 |
2.4 |
| 7215C/DB |
75*130*50 |
2.4 |
| 7015AC/DT |
75*115*40 |
1.26 |
| 7015AC/DF |
75*115*40 |
1.26 |
| 7015AC/DB |
75*115*40 |
1.26 |
| 7015C/DT |
75*115*40 |
1.26 |
| 7015C/DF |
75*115*40 |
1.26 |
| 7015C/DB |
75*115*40 |
1.26 |
| 7414B/DT |
70*180*84 |
11.1 |
| 7414B/DF |
70*180*84 |
11.1 |
| 7414B/DB |
70*180*84 |
11.1 |
| 7414AC/DT |
70*180*84 |
11.6 |
| 7414AC/DF |
70*180*84 |
11.6 |
| 7414AC/DB |
70*180*84 |
11.6 |
| 7414C/DT |
70*180*84 |
11.6 |
| 7414C/DF |
70*180*84 |
11.6 |
| 7414C/DB |
70*180*84 |
11.6 |
| 7314B/DT |
70*150*70 |
5.3 |
| 7314B/DF |
70*150*70 |
5.3 |
| 7314B/DB |
70*150*70 |
5.3 |
| 7314AC/DT |
70*150*70 |
5.34 |
| 7314AC/DF |
70*150*70 |
5.34 |
| 7314AC/DB |
70*150*70 |
5.34 |
| 7314C/DT |
70*150*70 |
5.34 |
| 7314C/DF |
70*150*70 |
5.34 |
| 7314C/DB |
70*150*70 |
5.34 |
| 7214B/DT |
70*125*48 |
2.2 |
| 7214B/DF |
70*125*48 |
2.2 |
| 7214B/DB |
70*125*48 |
2.2 |
| 7214AC/DT |
70*125*48 |
2.2 |
| 7214AC/DF |
70*125*48 |
2.2 |
| 7214AC/DB |
70*125*48 |
2.2 |
| 7214C/DT |
70*125*48 |
2.2 |
| 7214C/DF |
70*125*48 |
2.2 |
| 7214C/DB |
70*125*48 |
2.2 |
| 7014AC/DC |
70*110*40 |
1.2 |
| 7014AC/DF |
70*110*40 |
1.2 |
| 7014AC/DB |
70*110*40 |
1.2 |
| 7014C/DT |
70*110*40 |
1.2 |
| 7014C/DF |
70*110*40 |
1.2 |
| 7014C/DB |
70*110*40 |
1.2 |
| 7413B/DT |
65*160*74 |
8 |
| 7413B/DF |
65*160*74 |
8 |
| 7413B/DB |
65*160*74 |
8 |
| 7413AC/DT |
65*160*74 |
8.4 |
| 7413AC/DF |
65*160*74 |
8.4 |
| 7413AC/DB |
65*160*74 |
8.4 |
| 7413C/DT |
65*160*74 |
8.4 |
| 7413C/DF |
65*160*74 |
8.4 |
| 7413C/DB |
65*160*74 |
8.4 |
| 7313B/DT |
65*140*66 |
4.46 |
| 7313B/DF |
65*140*66 |
4.46 |
| 7313B/DB |
65*140*66 |
4.46 |
| 7313AC/DT |
65*140*66 |
4.46 |
| 7313AC/DF |
65*140*66 |
4.46 |
| 7313AC/DB |
65*140*66 |
4.46 |
| 7313C/DB |
65*140*66 |
4.46 |
| 7213B/DT |
65*120*46 |
2 |
| 7213B/DF |
65*120*46 |
2 |
| 7213B/DB |
65*120*46 |
2 |
| 7213AC/DT |
65*120*46 |
2 |
| 7213AC/DF |
65*120*46 |
2 |
| 7213AC/DB |
65*120*46 |
2 |
| 7213C/DT |
65*120*46 |
2 |
| 7213C/DF |
65*120*46 |
2 |
| 7213C/DB |
65*120*46 |
2 |
| 7013AC/DT |
65*100*36 |
0.86 |
| 7013AC/DF |
65*100*36 |
0.86 |
| 7013AC/DB |
65*100*36 |
0.86 |
| 7013C/DT |
65*100*36 |
0.86 |
| 7013C/DF |
65*100*36 |
0.86 |
| 7013C/DB |
65*100*36 |
0.86 |
| 7412B/DT |
60*150*70 |
6.4 |
| 7412B/DF |
60*150*70 |
6.4 |
| 7412B/DB |
60*150*70 |
6.4 |
| 7412AC/DT |
60*150*70 |
6.8 |
| 7412AC/DF |
60*150*70 |
6.8 |
| 7412AC/DB |
60*150*70 |
6.8 |
| 7412C/DT |
60*150*70 |
6.8 |
| 7412C/DF |
60*150*70 |
6.8 |
| 7412C/DB |
60*150*70 |
6.8 |
| 7312B/DT |
60*130*62 |
3.5 |
| 7312B/DF |
60*130*62 |
3.5 |
| 7312B/DB |
60*130*62 |
3.5 |
| 7312AC/DT |
60*130*62 |
3.42 |
| 7312AC/DF |
60*130*62 |
3.42 |
| 7312AC/DB |
60*130*62 |
3.42 |
| 7312C/DT |
60*130*62 |
3.42 |
| 7312C/DF |
60*130*62 |
3.42 |
| 7312C/DB |
60*130*62 |
3.42 |
| 7212B/DT |
60*110*44 |
1.6 |
| 7212B/DF |
60*110*44 |
1.6 |
| 7212B/DB |
60*110*44 |
1.6 |
| 7212AC/DT |
60*110*44 |
1.6 |
| 7212AC/DF |
60*110*44 |
1.6 |
| 7212AC/DB |
60*110*44 |
1.6 |
| 7212C/DT |
60*110*44 |
1.6 |
| 7212C/DF |
60*110*44 |
1.6 |
| 7212C/DB |
60*110*44 |
1.6 |
| 7012AC/DT |
60*95*36 |
0.8 |
| 7012AC/DF |
60*95*36 |
0.8 |
| 7012AC/DB |
60*95*36 |
0.8 |
| 7012C/DT |
60*95*36 |
0.8 |
| 7012C/DF |
60*95*36 |
0.8 |
| 7012C/DB |
60*95*36 |
0.8 |
| 7411B/DT |
55*140*66 |
5.1 |
| 7411B/DF |
55*140*66 |
5.1 |
| 7411B/DB |
55*140*66 |
5.1 |
| 7411AC/DT |
55*140*66 |
5.5 |
| 7411AC/DF |
55*140*66 |
5.5 |
| 7411AC/DB |
55*140*66 |
5.5 |
| 7411C/DT |
55*140*66 |
5.5 |
| 7411C/DF |
55*140*66 |
5.5 |
| 7411C/DB |
55*140*66 |
5.5 |
| 7311B/DT |
55*120*58 |
2.8 |
| 7311B/DF |
55*120*58 |
2.8 |
| 7311B/DB |
55*120*58 |
2.8 |
| 7311AC/DT |
55*120*58 |
2.84 |
| 7311AC/DF |
55*120*58 |
2.84 |
| 7311AC/DB |
55*120*58 |
2.84 |
| 7311C/DT |
55*120*58 |
2.84 |
| 7311C/DF |
55*120*58 |
2.84 |
| 7311C/DB |
55*120*58 |
2.84 |
| 7211B/DT |
55*100*42 |
1.24 |
| 7211B/DF |
55*100*42 |
1.24 |
| 7211B/DB |
55*100*42 |
1.24 |
| 7211AC/DT |
55*100*42 |
1.22 |
| 7211AC/DF |
55*100*42 |
1.22 |
| 7211AC/DB |
55*100*42 |
1.22 |
| 7211C/DT |
55*100*42 |
1.22 |
| 7211C/DF |
55*100*42 |
1.22 |
| 7211C/DB |
55*100*42 |
1.22 |
| 7011AC/DT |
55*90*36 |
0.76 |
| 7011AC/DF |
55*90*36 |
0.76 |
| 7011AC/DB |
55*90*36 |
0.76 |
| 7011C/DT |
55*90*36 |
0.76 |
| 7011C/DF |
55*90*36 |
0.76 |
| 7011C/DB |
55*90*36 |
0.76 |
| 7410B/DT |
50*130*62 |
4.2 |
| 7410B/DF |
50*130*62 |
4.2 |
| 7410B/DB |
50*130*62 |
4.2 |
| 7410AC/DT |
50*130*62 |
4.5 |
| 7410AC/DF |
50*130*62 |
4.5 |
| 7410AC/DB |
50*130*62 |
4.5 | |
|
| |
|
摩西机械进出口有限公司
