CN103670519A - Multiple-blade pneumatic motor - Google Patents
Multiple-blade pneumatic motor Download PDFInfo
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- CN103670519A CN103670519A CN201310690129.5A CN201310690129A CN103670519A CN 103670519 A CN103670519 A CN 103670519A CN 201310690129 A CN201310690129 A CN 201310690129A CN 103670519 A CN103670519 A CN 103670519A
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Abstract
The invention discloses a multiple-blade pneumatic motor which comprises a casing, a rotor, blades, sealing strips and cushion blocks, wherein the rotor is positioned in the center; the casing is positioned at the external part; the blades are placed in diagonal hollow circular rings of the casing and simultaneously positioned in the grooves of the rotor, and form angles with the rotor; one plane of each blade is tangent with the circular-truncated-cone side surface of the rotor; the sealing strips are positioned between the rotor and the blades; the plane sides of the sealing strips are adhered to the rotor; the circular-truncated-cone sides of the sealing strips are adhered to the circular-truncated-cone sides E1 of the blades; the cushion blocks are positioned in the diagonal hollow circular rings of the casing, and gaps formed by the casing, the blades, the rotor and the sealing strips are filled with cushion blocks just. The multiple-blade pneumatic motor disclosed by the invention has the advantages that all sealing parts adopt surface sealing, the size is small, the torque is large, the efficiency is high, the specific power is large, the structure is compact, the processing is easy relatively, the cost is relatively low, and the life is long.
Description
Technical field
The present invention relates to pneumatic motor, relate in particular to a kind of multiple-blade pneumatic motor.
Background technique
Existing pneumatic vane motor structure is a rotor eccentricity and is placed in cylinder block, blade radial or be placed in rotor with rotor radius is angled, and during work, blade throws away under the effect of spring or air pressure, forms Seal cage with cylinder block.This form pneumatic vane motor is owing to being by the sealing of Line of contact between blade and cylinder block, so sealability is poor, and output torque is lower, while adding rotation, between blade and rotor and cylinder block, produce very large friction, cause pneumatic vane motor overall wear fast, the life-span is short, and efficiency is low.In addition, during rotation, in order to guarantee that blade can safety pass in and out in rotor, rotor must have suitable diameter, like this certainly will volume large, specific power be low, although there is Double-blade type air pressure motor, but owing to only having two blades, output torque pulsation is larger, and it is large that output torque is also owed.
Summary of the invention
The object of this invention is to provide that a kind of can to realize specific power large, output torque is large, and output torque pulsation is again little, and all sealings place are again face sealing, and nonabradable multiple-blade pneumatic motor.
In order to achieve the above object, the technical solution used in the present invention is as follows: a kind of multiple-blade pneumatic motor, comprise housing, rotor, blade, Stamping Steel Ribbon and cushion block, rotor is positioned at center, housing is positioned at outside, blade is placed in the hollow ring at housing diagonal angle, also be positioned at the groove of rotor simultaneously, and with rotor at an angle, plane of blade and the frustum cone side of rotor are tangent, Stamping Steel Ribbon is between rotor and blade, its plane one side and rotor laminating, round table surface one side is fitted with the round table surface E1 of blade, cushion block is positioned at the hollow ring at housing diagonal angle, just in time fill up by housing, blade, the vacancy that rotor and Stamping Steel Ribbon form.
In above-mentioned a kind of multiple-blade pneumatic motor, described blade is quadrant shape, and total identical four, wherein a slice blade is enclosed and formed by two plane A1, B1 and cylinder C1, sphere D1 and two round table surface E1, J1; Wherein, C1Shi center is the cylinder that centre of sphere O1, radius are identical with the radius of the cylinder E3 of the hollow ring of housing, D1 is that the centre of sphere is the sphere that O1 radius is identical with rotor billiard table C2 radius, E1 and J1 are round table surface, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and straight line M1N1, and M1R1 and N1S1 are its side buses; Two plane A1 are parallel with B1; The thickness that the distance of two parallel plane A1 and B1 is blade, vane thickness equates with the hollow ring width of housing;
Described Stamping Steel Ribbon has identical eight, wherein an E1 side is round table surface, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and P1Q1, P1R1 and N1S1 are its side buses, K1 side is plane, cross axis and this plane parallel of centre of sphere O1, its perpendicular distance is half of four-bladed vane thickness of slab of rotor quadrature, G1 is that the centre of sphere is the sphere that O1 radius equates with rotor center billiard table C2 radius, F1 is that the centre of sphere is the sphere that O1 radius equals rotor line segment O2M2, two faces of H1 and I1 are parallel planes, its half long OP1 equates with housing cylinder F3 radius, width equates with width of blade, R1 and the S1 inclined-plane that to be two gradients equate for the gradient of B3 with face D3 in Fig. 7.The width of Stamping Steel Ribbon equates with vane thickness; Blade and Stamping Steel Ribbon are axisymmetric;
It in the middle of described rotor, is the parallel dolioform billiard table that cuts out two spherical crowns in two, in the middle of billiard table, as symmetry, insert the four-bladed vane of a quadrature, cydariform billiard table two is two identical hollow round tables, A2 is parallel disk with B2, R2 is also parallel disk with S2, C2 and D2 are that the centre of sphere is the sphere of O2, I2 and J2 are orthogonal two planes, a blade and two Stamping Steel Ribbons are vertically placed in the groove between I2 and J2, just in time completely closely sealed, E2 is that central shaft is crossed the cylinder that O2 radius is identical with housing cylinder F3 radius with F2, G2 and H2 are two identical hollow round table part sides, one upper and lower two ends of side round platform were respectively disk A2 and disk R2, upper and lower two ends of opposite side round platform are respectively disk B2 and disk S2, the length of straigh line of K2M2 is the width of rotor, two frustum cone side G2 and H2 and corresponding housing hollow ring parallel plane C3 and D3 fit, whole rotor is not only about billiard table center O 2 symmetries, also be axisymmetric,
Described housing is the parallel dolioform sphere that cuts out two spherical crowns in two, thickness equates with the width K2M2 of rotor, A3 is the parallel disk that two radiuses equate with B3, F3 is cylinder, its central shaft is crossed O3, radius equates with the radius of rotor left and right outside E2 and F2 cylinder, the diagonal angle of housing cylinder is a hollow ring, annulus width equates with vane thickness, two side C3 of hollow ring are parallel circular planes with D3, E3 is that central shaft is by the cylinder of O3, be positioned on the diagonal of housing, its external diameter equates with the external diameter of blade cylinder C1, and be greater than the external diameter of housing cylinder F3, the C3 that annulus is parallel and D3 two planes fit with corresponding rotor two hollow round table side G2 and H2, whole housing is about billiard table center O 3 symmetries,
Described cushion block is one section of annulus, have identical four, wherein an outside A4 is the cylinder that radius equates with housing diagonal angle annulus E3 external diameter, inner side B4 is the sphere that radius equals rotor line segment O2M2, its upper and lower thickness equates with the four-bladed vane width K2M2 of rotor quadrature, and two waist C4 and D4 are round table surface, and the diameter of this round table surface upper bottom surface and bottom surface is respectively straight line P1Q1 and M1N1, M1P1 is its side bus, and cushion block is shaped as axisymmetric.
The advantage that the present invention has is:
1) all sealings place are face sealing;
2) volume is little, and moment of torsion is large, and efficiency is high;
3) specific power is large;
4) compact structure, processing is relatively easy;
5) cost is lower, and the life-span is long.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is blade of the present invention and Stamping Steel Ribbon shape schematic diagram;
Fig. 2 is the left view of Fig. 1;
Fig. 3 be Fig. 1 S to T to schematic diagram;
Fig. 4 is rotor shapes schematic diagram of the present invention;
Fig. 5 is the W-W generalized section of Fig. 4;
Fig. 6 is the plan view of housing of the present invention;
Fig. 7 is the plan view of housing of the present invention;
Fig. 8 is the M-M generalized section of Fig. 7;
Fig. 9 is overall structure schematic diagram of the present invention;
Figure 10 is that the K of Fig. 9 is to schematic diagram;
Figure 11 is the N-N generalized section of Fig. 9;
Figure 12 is running principle schematic diagram of the present invention;
Figure 13 is the U-U generalized section of Fig. 9;
Figure 14 is working procedure principle schematic of the present invention;
Figure 15 is the V-V generalized section of Figure 12;
Figure 16 is working procedure principle schematic of the present invention.
In figure: 1. housing, 2. rotor, 3. blade, 4. Stamping Steel Ribbon, 5. cushion block.
Embodiment
Structure of the present invention as shown in figure 12, rotor 2 is positioned at center, housing 1 is positioned at outside, blade 3 is placed in the hollow ring (guiding groove) at housing 1 diagonal angle, also be positioned at the groove of rotor 2 simultaneously, and with rotor 2 at an angle, plane of blade 3 and the frustum cone side of rotor 2 are tangent, Stamping Steel Ribbon 4 is between rotor 2 and blade, its plane one side and rotor 2 laminatings, round table surface one side is fitted with the round table surface E1 of blade 3, and cushion block 5 is positioned at the hollow ring at housing 1 diagonal angle, just in time fills up the vacancy being formed by housing 1, blade 3, rotor 2 and Stamping Steel Ribbon 4.
Fig. 1 and the shape that Figure 3 shows that blade 3 of the present invention and Stamping Steel Ribbon 4.Blade 3 is quadrant shape or approximate quadrant shape, and total identical four, wherein a slice blade 3 is enclosed and formed by two plane A1, B1 and cylinder C1, sphere D1 and two round table surface E1, J1; Wherein, C1Shi center is the cylinder that centre of sphere O1, radius are identical with the radius of the cylinder E3 of the hollow ring of housing 1, D1 is that the centre of sphere is the sphere that O1 radius is identical with Fig. 5 rotor 2 billiard table C2 radiuses, E1 and J1 are round table surface, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and straight line M1N1, and M1R1 and N1S1 are its side buses; Two plane A1 are parallel with B1; The distance of two parallel plane A1 and B1 is the thickness of blade 3, and blade 3 thickness equate with the hollow ring width of Fig. 7 housing 1.
Stamping Steel Ribbon 4 has identical eight, wherein an E1 side is round table surface, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and P1Q1, P1R1 and N1S1 are its side buses, K1 side is plane, cross the axis (as shown in Figure 1) and this plane parallel of centre of sphere O1, its perpendicular distance is half of four-bladed vane thickness of slab of Fig. 4 rotor 2 quadratures, G1 is that the centre of sphere is the sphere that O1 radius equates with Fig. 5 rotor 2 center billiard table C2 radiuses, F1 is that the centre of sphere is the sphere that O1 radius equals Fig. 4 rotor 2 line segment O2M2, two faces of H1 and I1 are parallel planes, its half long OP1 equates with Fig. 7 housing 1 cylinder F3 radius, width equates with blade 3 width, R1 and the S1 inclined-plane that to be two gradients equate for the gradient of B3 with face D3 in Fig. 7.The width of Stamping Steel Ribbon 4 (being the distance of plane H1 and I1) equates with blade 3 thickness; Blade 3 and Stamping Steel Ribbon 4 are axisymmetric.
Fig. 4 and the shape that Figure 5 shows that rotor 2 of the present invention.It in the middle of rotor 2, is the parallel dolioform billiard table that cuts out two spherical crowns in two, in the middle of billiard table, as symmetry, insert the four-bladed vane of a quadrature, cydariform billiard table two is two identical hollow round tables, A2 is parallel disk with B2, R2 is also parallel disk with S2, C2 and D2 are that the centre of sphere is the sphere of O2, I2 and J2 are orthogonal two planes, by the whole figure of Fig. 1, a blade 3 and two Stamping Steel Ribbons 4 are vertically placed in the groove between I2 and J2, just in time completely closely sealed, E2 is that central shaft is crossed the cylinder that O2 radius is identical with housing 1 cylinder F3 radius with F2, G2 and H2 are two identical hollow round table part sides, one upper and lower two ends of side round platform were respectively disk A2 and disk R2, upper and lower two ends of opposite side round platform are respectively disk B2 and disk S2, the length of straigh line of K2M2 is the width of rotor 2, the spatial position of two frustum cone side G2 and H2 is to determine as follows: after guaranteeing to assemble, two frustum cone side G2 and H2 and corresponding housing 1 hollow ring parallel plane C3 and D3 fit, whole rotor 2 is not only about billiard table center O 2 symmetries, also be axisymmetric.
Fig. 6, Fig. 7 and Figure 8 shows that the shape of housing 1 of the present invention.Housing 1 is the parallel dolioform sphere that cuts out two spherical crowns in two, thickness equates with the width K2M2 of rotor 2, A3 is the parallel disk that two radiuses equate with B3, F3 is cylinder, its central shaft is crossed O3, radius equates with the radius of E2 outside rotor 2 left and right and F2 cylinder, the diagonal angle of housing 1 cylinder is a hollow ring, annulus width equates with blade 3 thickness, two side C3 of hollow ring are parallel circular planes with D3, E3 is that central shaft is by the cylinder of O3, be positioned on the diagonal of housing 1, its external diameter equates with the external diameter of blade 3 cylinder C1, and be greater than the external diameter of housing 1 cylinder F3, the spatial position of the C3 that annulus is parallel and D3 two planes is to determine as follows: guarantee to assemble rear C3 and D3 two planes and fit with corresponding 2 liang of hollow round table side G2 of rotor and H2, the sphere of L3I3J3 is deflation area, the position of I3J3 is the dull and stereotyped position by Q5 side plane of the rotor between chamber Q4 and Q5 2 when rotor 2 forwards position shown in Figure 14 to.The sphere of K3G3H3 is air inlet face, and the position of G3H3 is depending on suction pressure.Whole housing 1 is about billiard table center O 3 symmetries.
5 shapes that are depicted as cushion block 5 of the present invention in Figure 11.Cushion block 5 is one section of annulus, have identical four, wherein an outside A4 is the cylinder that radius equates with housing 1 diagonal angle annulus E3 external diameter, interior survey B4 is the sphere that radius equals Fig. 4 rotor 2 line segment O2M2, its upper and lower thickness equates with the four-bladed vane width K2M2 of rotor 2 quadratures, and two waist C4 and D4 are round table surface, the diameter of this round table surface upper bottom surface and bottom surface be respectively straight line P1Q1 and M1N1(as shown in Figure 1), M1P1 is its side bus, and cushion block 5 is shaped as axisymmetric.
Operation working principle of the present invention is as follows:
As Figure 14, in one end of pneumatic motor, rotor 2, blade 3, Stamping Steel Ribbon 4 and housing 1 are divided into five independently Seal cage Q1, Q2, Q3, Q4 and Q5 separately by air cavity.
One end at rotor 2, when rotor 2 is when air inlet initial position (as Figure 13), high pressure air enters air cavity Q1 from the air inlet face of distribution cone, as Figure 14, at this moment air cavity Q4 and Q5 have been full of high pressure air, and air cavity Q2 and Q3 are low pressure gas, five pressure reduction that air cavity forms, on rotor, produce moment of torsion, rotor is rotated counterclockwise, then promote blade and be rotated counterclockwise.When rotor is rotated counterclockwise, the deflation area that the low pressure gas in air cavity Q2 and Q3 is bored by distribution is discharged.When high pressure air continues to enter air cavity Q1, Q4 and Q5 from the air inlet face of distribution cone, rotor continues to be rotated counterclockwise.
When rotor forwards Figure 14 position to, and while continuing to be rotated counterclockwise, air cavity Q4 becomes low pressure exhaust chamber then from high pressure admission chamber, and high pressure air continues to enter air cavity Q1 and Q5, and air cavity Q2 and Q3 are still low pressure exhaust chamber.The moment of torsion that draught head produces continues drive rotor and is rotated counterclockwise, when rotor rotates counterclockwise Figure 15 position, low pressure gas in exhaust cavity Q2 drains, and Q1 and Q5 are still high pressure admission chamber, Q3 and Q4 are still low pressure exhaust chamber, at this moment high pressure air enters new high pressure admission chamber from the air inlet face of distribution cone again, and drive rotor continues to be rotated counterclockwise.
When rotor also continues rotation to Figure 16 position, chamber Q5 becomes low pressure exhaust chamber then from high pressure admission chamber, and at this moment Q1 is still high pressure admission chamber, and Q3 and Q4 are still low pressure exhaust chamber, and high pressure air continues to enter new high pressure admission chamber, drive rotor continues to be rotated counterclockwise.
When rotor rotates counterclockwise Figure 13 position, the low pressure gas in exhaust cavity Q3 drains, and Q1 is still high pressure admission chamber, and Q4 and Q5 are still low pressure exhaust chamber, and high pressure air is also entering new high pressure admission chamber, and drive rotor continues to be rotated counterclockwise.
When rotor also continues rotation to Figure 14 position, chamber Q1 becomes low pressure exhaust chamber then from high pressure admission chamber.So go round and begin again, drive rotor is constantly rotated counterclockwise.At the other end of pneumatic motor, situation is also identical with this one end.
Above-described embodiment is used for the present invention that explains, rather than this aspect is limited, and in the protection domain of spirit of the present invention and claim, any modification and change that this aspect is made, all fall into protection scope of the present invention.
Claims (3)
1. a multiple-blade pneumatic motor, it is characterized in that, comprise housing (1), rotor (2), blade (3), Stamping Steel Ribbon (4) and cushion block (5) etc., rotor (2) is positioned at center, housing (1) is positioned at outside, blade (3) is placed in the hollow ring at housing (1) diagonal angle, also be positioned at the groove of rotor (2) simultaneously, and with rotor (2) at an angle, plane of blade (3) and the frustum cone side of rotor (2) are tangent, Stamping Steel Ribbon (4) is positioned between rotor (2) and blade, its plane one side and rotor (2) laminating, round table surface one side is fitted with the round table surface E1 of blade (3), cushion block (5) is positioned at the hollow ring at housing (1) diagonal angle, just in time fill up by housing (1), blade (3), the vacancy that rotor (2) and Stamping Steel Ribbon (4) form.
2. a kind of multiple-blade pneumatic motor according to claim 1, it is characterized in that, described blade (3) is quadrant shape, and total identical four, wherein a slice blade (3) is enclosed and formed by two plane A1, B1 and cylinder C1, sphere D1 and two round table surface E1, J1; Wherein, C1Shi center is the cylinder that centre of sphere O1, radius are identical with the radius of the cylinder E3 of the hollow ring of housing (1), D1 is that the centre of sphere is the sphere that O1 radius is identical with rotor (2) billiard table C2 radius, E1 and J1 are round table surface, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and straight line M1N1, and M1R1 and N1S1 are its side buses; Two plane A1 are parallel with B1; The distance of two parallel plane A1 and B1 is the thickness of blade (3), and blade (3) thickness equates with the hollow ring width of housing (1);
Described Stamping Steel Ribbon (4) has identical eight, wherein an E1 side is round table surface, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and P1Q1, P1R1 and N1S1 are its side buses, K1 side is plane, cross axis and this plane parallel of centre of sphere O1, its perpendicular distance is half of four-bladed vane thickness of slab of rotor (2) quadrature, G1 is that the centre of sphere is the sphere that O1 radius equates with rotor (2) center billiard table C2 radius, F1 is that the centre of sphere is the sphere that O1 radius equals rotor (2) line segment O2M2, two faces of H1 and I1 are parallel planes, its half long OP1 equates with housing (1) cylinder F3 radius, width equates with blade (3) width, R1 and the S1 inclined-plane that to be two gradients equate for the gradient of B3 with face D3 in Fig. 7.
3. the width of Stamping Steel Ribbon (4) equates with blade (3) thickness; Blade (3) and Stamping Steel Ribbon (4) are axisymmetric;
It in the middle of described rotor (2), is the parallel dolioform billiard table that cuts out two spherical crowns in two, in the middle of billiard table, as symmetry, insert the four-bladed vane of a quadrature, cydariform billiard table two is two identical hollow round tables, A2 is parallel disk with B2, R2 is also parallel disk with S2, C2 and D2 are that the centre of sphere is the sphere of O2, I2 and J2 are orthogonal two planes, a blade (3) and two Stamping Steel Ribbons (4) are vertically placed in the groove between I2 and J2, just in time completely closely sealed, E2 is that central shaft is crossed the cylinder that O2 radius is identical with housing (1) cylinder F3 radius with F2, G2 and H2 are two identical hollow round table part sides, one upper and lower two ends of side round platform were respectively disk A2 and disk R2, upper and lower two ends of opposite side round platform are respectively disk B2 and disk S2, the length of straigh line of K2M2 is the width of rotor (2), two frustum cone side G2 and H2 and corresponding housing (1) hollow ring parallel plane C3 and D3 fit, whole rotor (2) is not only about billiard table center O 2 symmetries, also be axisymmetric,
Described housing (1) is the parallel dolioform sphere that cuts out two spherical crowns in two, thickness equates with the width K2M2 of rotor (2), A3 is the parallel disk that two radiuses equate with B3, F3 is cylinder, its central shaft is crossed O3, radius equates with the radius of rotor (2) left and right outside E2 and F2 cylinder, the diagonal angle of housing (1) cylinder is a hollow ring, annulus width equates with blade (3) thickness, two side C3 of hollow ring are parallel circular planes with D3, E3 is that central shaft is by the cylinder of O3, be positioned on the diagonal of housing (1), its external diameter equates with the external diameter of blade (3) cylinder C1, and be greater than the external diameter of housing (1) cylinder F3, the C3 that annulus is parallel and D3 two planes fit with corresponding rotor (2) two hollow round table side G2 and H2, whole housing (1) is about billiard table center O 3 symmetries,
Described cushion block (5) is one section of annulus, have identical four, wherein an outside A4 is the cylinder that radius equates with housing (1) diagonal angle annulus E3 external diameter, inner side B4 is the sphere that radius equals rotor (2) line segment O2M2, its upper and lower thickness equates with the four-bladed vane width K2M2 of rotor (2) quadrature, and two waist C4 and D4 are round table surface, and the diameter of this round table surface upper bottom surface and bottom surface is respectively straight line P1Q1 and M1N1, M1P1 is its side bus, and cushion block (5) is shaped as axisymmetric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310690129.5A CN103670519A (en) | 2013-12-16 | 2013-12-16 | Multiple-blade pneumatic motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310690129.5A CN103670519A (en) | 2013-12-16 | 2013-12-16 | Multiple-blade pneumatic motor |
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| CN103670519A true CN103670519A (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310690129.5A Pending CN103670519A (en) | 2013-12-16 | 2013-12-16 | Multiple-blade pneumatic motor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050186100A1 (en) * | 2004-02-23 | 2005-08-25 | Paul Weatherbee | Spherical fluid machines |
| CN101338752A (en) * | 2008-07-26 | 2009-01-07 | 郑良才 | Compressor or vacuum pump |
| CN101344085A (en) * | 2008-07-30 | 2009-01-14 | 郑良才 | Vane compressor or vacuum pump |
| CN101368565A (en) * | 2008-08-08 | 2009-02-18 | 郑良才 | Cylindrical vane compressor or vacuum pump |
| CN101418792A (en) * | 2008-12-11 | 2009-04-29 | 宁波华液机器制造有限公司 | High performance spherical hydraulic pump |
-
2013
- 2013-12-16 CN CN201310690129.5A patent/CN103670519A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050186100A1 (en) * | 2004-02-23 | 2005-08-25 | Paul Weatherbee | Spherical fluid machines |
| CN101338752A (en) * | 2008-07-26 | 2009-01-07 | 郑良才 | Compressor or vacuum pump |
| CN101344085A (en) * | 2008-07-30 | 2009-01-14 | 郑良才 | Vane compressor or vacuum pump |
| CN101368565A (en) * | 2008-08-08 | 2009-02-18 | 郑良才 | Cylindrical vane compressor or vacuum pump |
| CN101418792A (en) * | 2008-12-11 | 2009-04-29 | 宁波华液机器制造有限公司 | High performance spherical hydraulic pump |
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Application publication date: 20140326 |