CN108458739B - Rack with adjustable tilt axis and method of mounting a swivel base - Google Patents
Rack with adjustable tilt axis and method of mounting a swivel base Download PDFInfo
- Publication number
- CN108458739B CN108458739B CN201710096759.8A CN201710096759A CN108458739B CN 108458739 B CN108458739 B CN 108458739B CN 201710096759 A CN201710096759 A CN 201710096759A CN 108458739 B CN108458739 B CN 108458739B
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- CN
- China
- Prior art keywords
- base
- bearing
- threaded
- upright
- mounting hole
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000003754 machining Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000002591 computed tomography Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/30—Supports specially adapted for an instrument; Supports specially adapted for a set of instruments
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
- A61B6/035—Mechanical aspects of CT
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
Abstract
The invention discloses a frame with an adjustable tilt axis and a method for mounting a rotating base. The frame comprises: a swivel base having a threaded bore and a bore; a base having a first mounting hole and a second mounting hole; a first bearing and a second bearing; a first tilt shaft having a first inner cylindrical portion, a first outer cylindrical portion, and a threaded end adjacent the first inner cylindrical portion; a second tilt shaft having a second inner column portion and a second outer column portion; the first bearing is sleeved on the first outer column part, is positioned in the first mounting hole of the base and is fixed relative to the base, the first inner column part passes through the hole of the rotating base, and the threaded end is matched with a nut; the second bearing is sleeved on the second outer column part, is positioned in the second mounting hole of the base and is fixed relative to the base, and the second inner column part is matched with the threaded hole of the rotating base and the other nut.
Description
Technical Field
The present invention relates to computed tomography, and in particular to a gantry for a CT machine.
Background
The frame base is an important structural member in a CT system, and has the main function of providing a mounting platform for all parts of the CT frame, and is the basis of a CT machine.
The frame in the form of the integral upright post is adopted, the bearing structure is dispersed into the integral frame, the bearing girder structure is reduced, a complete space is formed, and the utilization rate of the frame space is improved.
A frame in the form of an integral column typically requires mounting of the tilt axle to the column side plates. In order to eliminate the influence on the rotation support, the internal stress between the stand and the inclined frame needs to be reduced as much as possible, and the requirement on the fit size is high.
At present, for the inclined CT machine adopting the integral upright column type, methods for eliminating the internal stress between the frame base and the rotating base generally comprise methods for improving the processing precision, increasing the structural rigidity of the frame base and the rotating base and increasing the adjusting structure, but high-precision internal stress inspection is required. The above methods all increase production and assembly commissioning costs.
Disclosure of Invention
In view of this, the present invention proposes a frame with an adjustable tilt axis and a method of mounting a swivel base.
According to a first aspect of the present invention, there is provided a gantry having an adjustable tilt axis, comprising: a swivel base having a threaded bore and a bore; the base is provided with a first upright post and a second upright post, and the first upright post and the second upright post are respectively provided with a first mounting hole and a second mounting hole; a first bearing and a second bearing; a first tilt shaft having a first inner cylindrical portion, a first outer cylindrical portion, and a threaded end adjacent the first inner cylindrical portion; a second tilt shaft having a second inner cylinder portion and a second outer cylinder portion, the second inner cylinder portion having a threaded surface; the first bearing is sleeved on the first outer column part, is positioned in the first mounting hole of the base and is fixed relative to the base, the first inner column part passes through the hole of the rotating base, and the threaded end is matched with a nut; the second bearing is sleeved on the second outer column part, is positioned in the second mounting hole of the base and is fixed relative to the base, and the second inner column part is matched with the threaded hole of the rotating base and the other nut.
In one embodiment, the first tilt axle has a first shoulder that is interposed between the first inner and outer cylinder portions; the second tilt shaft having a second shoulder intermediate the second inner and outer column portions; the outer ring of the first bearing abuts against the first shaft shoulder, and the inner ring is clamped by a locking ring; the outer ring of the second bearing abuts against the second shoulder, and the inner ring is clamped by the other locking ring.
In one embodiment, the first tilt shaft has a first operating end adjacent the first outer column portion, the second tilt shaft has a second operating end adjacent the second outer column portion, and one or both of the first and second operating ends are of a hexagonal outer structure.
In one embodiment, the hole of the rotating base is a through hole.
In one embodiment, the bore of the swivel base is a threaded bore and the first inner cylinder portion has a threaded surface.
According to a second aspect of the present invention, there is provided a method of installing a rotating base having a threaded bore and a bore, the method comprising: providing a base, wherein the base is provided with a first upright post and a second upright post, and the first upright post and the second upright post are respectively provided with a first mounting hole and a second mounting hole; providing a first tilt shaft having a first inner cylinder portion and a first outer cylinder portion, a threaded end adjacent the first inner cylinder portion, and a first operating end adjacent the first outer cylinder portion; providing a second tilt shaft having a second inner and outer cylinder portion and a second operating end adjacent the second outer cylinder portion, the second inner cylinder portion having a threaded surface; a second bearing is sleeved on the second outer column part and is arranged in a second mounting hole of the base, the second operating end is rotated to enable the second inner column part to be screwed into a threaded hole of the rotating base, and a gap is reserved between the second bearing and a second upright post of the base; a first bearing is sleeved on the first outer column part and is arranged in a first mounting hole of the base, the first inner column part passes through the hole of the rotating base, the first bearing is fixed relative to a first upright post of the base, the first operating end is fixed, and a nut is fastened on the threaded end; and fixing the second bearing relative to the second upright post of the base, fastening the second inner column part by another nut, and enabling the axial displacement of the first inclined shaft to be zero.
In one embodiment, the first tilt axle has a first shoulder that is interposed between the first inner and outer cylinder portions; the second tilt shaft having a second shoulder intermediate the second inner and outer column portions; the outer ring of the first bearing abuts against the first shaft shoulder, and the inner ring is clamped by a locking ring; the outer ring of the second bearing abuts against the second shoulder, and the inner ring is clamped by the other locking ring.
In an embodiment, one or both of the first and second operating ends are of an outer hexagonal structure.
In one embodiment, the hole of the rotating base is a through hole.
In one embodiment, the bore of the swivel base is a threaded bore and the first inner cylinder portion has a threaded surface.
The machine frame and the method for installing the rotating base have a convenient installation and adjustment mode, can reduce production, assembly and debugging costs, and eliminate the problem of size matching caused by machining deviation and deformation errors of the rotating base and the base, thereby ensuring that the bearing is in a normal working state. Meanwhile, the rack is simple and reliable in structure and high in universality, and has complete and compact electrical space arrangement.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings in which:
fig. 1 is a schematic view of a first tilt axis according to an embodiment of the invention.
Fig. 2 is a schematic view of a second tilt axis according to this embodiment of the invention.
Fig. 3 is a schematic view of a frame according to this embodiment of the invention.
Fig. 4 is a cross-sectional view of the housing of fig. 3 taken along line A-A.
In the above figures, the following reference numerals are used:
100. second outer column portion of frame 124
102. Second operation end of rotating base 126
104. Base 128 first bearing
106. First tilting shaft 129 second bearing
108. Second tilting shaft 130 first mounting hole
110. First shaft shoulder 131 second mounting hole
112. First inner cylinder 132 hole
114. Threaded hole of first outer cylinder 134
116. Threaded end 136 nut
118. First operating end 138 locking ring
120. Second shoulder 140 first column
122. Second column of second inner column portion 142
Detailed Description
The present invention will be further described in detail with reference to the following examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Fig. 1 is a schematic view of a first tilt shaft 106 according to an embodiment of the present invention, fig. 2 is a schematic view of a second tilt shaft 108 according to the embodiment of the present invention, and fig. 3 is a schematic view of a rack 100 according to the embodiment of the present invention. The housing 100 includes a swivel base 102 and a base 104. The swivel base 102 may be mounted to the base 104 using a first tilt axis 106 and a second tilt axis 108. As shown in FIG. 1, the first tilt shaft 106 has a first inner cylinder 112 and a first outer cylinder 114, a threaded end 116 adjacent the first inner cylinder 112, and a first operating end 118 adjacent the first outer cylinder 114. As shown in fig. 2, the second tilt shaft 108 has a second inner cylinder 122 and a second outer cylinder 124, and a second operating end 126 adjacent the second outer cylinder 124, the second inner cylinder 122 having a threaded surface. Fig. 4 is a cross-sectional view of the housing 100 of fig. 3 taken along line A-A. As shown in fig. 4, the swivel base 102 has a threaded bore 134 and a bore 132. In the present embodiment, the threaded hole 134 of the swivel base 102 is located on the left side, and the hole 132 is located on the right side, so the left side is the adjustment side. The base 104 has a first upright 140 and a second upright 142, the first upright 140 and the second upright 142 having a first mounting hole 130 and a second mounting hole 131, respectively. The frame 100 further includes a first bearing 128 and a second bearing 129. The first bearing 128 and the second bearing 129 may be deep groove ball bearings or bearing sets with both axial and radial loads, and the play may range from 0.2 to 0.5mm.
When the rotating base 102 is mounted, the second bearing 129 is first sleeved in the second outer column portion 124 of the second tilting shaft 108 and placed in the second mounting hole 131 of the base 104, the second operating end 126 of the second tilting shaft 108 is rotated to screw the second inner column portion 122 into the threaded hole 134 of the rotating base 102, and a gap is left between the second bearing 129 and the second upright post 142 of the base 104.
The first bearing 128 is then sleeved over the first outer cylindrical portion 114 of the first tilt shaft 106 and positioned within the first mounting hole 130 of the base 104, the first inner cylindrical portion 112 of the first tilt shaft 106 is passed through the hole 132 of the swivel base 102, the first bearing 128 is fixed relative to the first post 140 of the base 104, the first operating end 118 is fixed, and a nut 136 is fastened to the threaded end 116 on the swivel base 102 side. When fastening the first tilting shaft 106, the second tilting shaft 108 should be ensured to be in a free state, the play of the bearings being between 0.2 and 0.3 mm. In this embodiment, the first bearing 128 has a mounting hole, which is sleeved on the fixing screw of the first upright 140, and the first bearing 128 can be fastened on the first upright 140 through the cooperation of the nut and the fixing screw.
After the first tilt shaft 106 is secured, a dial gauge is placed at the end of the mounted first tilt shaft 106, and zeroed.
Finally, the second bearing 129 is fixed relative to the second post 142 of the base 104 and the second inner cylindrical portion 122 is tightened with the other nut 136, and the axial displacement of the first tilt shaft 106 is made zero. In this embodiment, the second bearing 129 has a mounting hole, which is sleeved on the fixing screw of the second upright 142, and the second bearing 129 can be fastened to the second upright 142 by matching a nut with the fixing screw. By adjusting the depth of the second inner cylinder 122 screwed into the threaded hole 134, fine adjustment in the X-axis direction can be achieved, so that the distance between the base 104 and the rotating base 102 at the adjusting side is changed, the dimension matching problem caused by machining deviation and deformation errors of the rotating base 102 and the base 104 is eliminated, and the bearing is guaranteed to be in a normal working state.
During the process of fixing the second tilt axis 108, if the dial indicator is found to be non-zero, the second operating end 126 of the second tilt axis 108 is adjusted by a standard tool, such as a split wrench, to control the state of the internal stress such that the dial indicator is again at zero. The numerical display state of the dial indicator is checked both after tightening the nut that fixes the second bearing 129 and after tightening the nut of the second tilting shaft 108.
In order to place the second tilt shaft 108 in a non-fixed state when the swivel base 102 is installed, the swivel base 102 may be supported or lifted by an additional support.
To define the axial position of the first bearing 128 and the second bearing 129 such that the bearing outer race is rotatable only axially, the first tilt axle 106 has a first shoulder 110 that is interposed between the first inner cylinder 112 and the first outer cylinder 114, and the second tilt axle 108 has a second shoulder 120 that is interposed between the second inner cylinder 122 and the second outer cylinder 124. The outer race of the first bearing 128 abuts the first shoulder 110, the inner race is captured by a locking ring 138, the outer race of the second bearing 129 abuts the second shoulder 120, and the inner race is captured by another locking ring 138. The locking ring may be a standard with set screws for clamping the locking ring.
One or both of the first and second operating ends 118, 126 may be of a hex-shaped configuration to facilitate adjustment using a standard tool such as an open ended wrench.
In addition to the threaded connection, the first tilt shaft 106 and the second tilt shaft 108 may also be axially positioned by means of eccentric locking or the like.
In the present embodiment, the hole 132 of the rotating base 102 is a through hole, and the first inner cylinder 112 of the first tilt shaft 106 is a polished rod, so that only the second tilt shaft 108 is adjustable. In other embodiments, the bore 132 of the swivel base 102 may also be a threaded bore, and accordingly, the first inner cylindrical portion 112 of the first tilt axle 106 may also have a threaded surface, such that both the first tilt axle 106 and the second tilt axle 108 may be adjustable.
The machine frame and the method for installing the rotating base have a convenient installation and adjustment mode, can reduce production, assembly and debugging costs, and eliminate the problem of size matching caused by machining deviation and deformation errors of the rotating base and the base, thereby ensuring that the bearing is in a normal working state. Meanwhile, the rack is simple and reliable in structure and high in universality, and has complete and compact electrical space arrangement.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. A gantry (100) with an adjustable tilt axis of a CT machine, comprising:
a swivel base (102) having a threaded bore (134) and a bore (132);
a base (104) having a first upright (140) and a second upright (142), the first upright (140) and the second upright (142) having a first mounting hole (130) and a second mounting hole (131), respectively;
a first bearing (128) and a second bearing (129);
a first tilt shaft (106) having a first inner cylinder (112), a first outer cylinder (114) and a threaded end (116) adjacent the first inner cylinder (112);
a second tilt shaft (108) having a second inner cylinder (122) and a second outer cylinder (124), the second inner cylinder (122) having a threaded surface;
the first bearing (128) is sleeved in the first outer column part (114), is positioned in a first mounting hole (130) of the base (104) and is fixed relative to the base (104), the first inner column part (112) passes through a hole (132) of the rotating base (102), and the threaded end (116) is matched with a nut (136);
the second bearing (129) is sleeved in the second outer column part (124), is positioned in a second mounting hole (131) of the base (104) and is fixed relative to the base (104), and the second inner column part (122) is matched with a threaded hole (134) of the rotating base (102) and another nut (136).
2. The frame (100) of claim 1, wherein the first tilt axis (106) has a first shoulder (110) interposed between the first inner cylinder portion (112) and the first outer cylinder portion (114);
the second tilt shaft (108) has a second shoulder (120) interposed between the second inner and outer column portions (122, 124);
the outer ring of the first bearing (128) abuts against the first shaft shoulder (110), and the inner ring is clamped by a locking ring (138);
the outer ring of the second bearing (129) abuts against the second shoulder (120), and the inner ring is clamped with a further clamping ring (138).
3. The gantry (100) of claim 1, in which the first tilt axis (106) has a first operating end (118) adjacent the first outer column (114), the second tilt axis (108) has a second operating end (126) adjacent the second outer column (124), and one or both of the first operating end (118) and the second operating end (126) are of hexagonal configuration.
4. The frame (100) of claim 1, wherein the aperture (132) of the swivel base (102) is a through-hole.
5. The frame (100) of claim 1, wherein the bore (132) of the swivel base (102) is a threaded bore and the first inner cylinder portion (112) has a threaded surface.
6. A method of installing a rotating base (102), the rotating base (102) having a threaded bore (134) and a bore (132), the method comprising:
providing:
a base (104) having a first upright (140) and a second upright (142), the first upright (140) and the second upright (142) having a first mounting hole (130) and a second mounting hole (131), respectively;
a first tilt axis (106) having a first inner cylinder (112) and a first outer cylinder (114), a threaded end (116) adjacent the first inner cylinder (112), and a first operating end (118) adjacent the first outer cylinder (114);
a second tilt axis (108) having a second inner cylinder (122) and a second outer cylinder (124), and a second operating end (126) adjacent the second outer cylinder (124), the second inner cylinder (122) having a threaded surface;
a second bearing (129) is sleeved in the second outer column part (124) and is arranged in a second mounting hole (131) of the base (104), the second operating end (126) is rotated to enable the second inner column part (122) to be screwed into a threaded hole (134) of the rotating base (102), and a gap is reserved between the second bearing (129) and a second upright post (142) of the base (104);
sleeving a first bearing (128) on the first outer column part (114) and placing the first bearing in a first mounting hole (130) of the base (104), penetrating the first inner column part (112) through a hole (132) of the rotary base (102), fixing the first bearing (128) relative to a first column (140) of the base (104), fixing the first operating end (118) and fastening a nut (136) on the threaded end (116);
-fixing the second bearing (129) with respect to the second upright (142) of the base (104) and fastening the second inner cylindrical portion (122) with a further nut (136) and bringing the axial displacement of the first tilting shaft (106) to zero.
7. The method of claim 6, wherein the first tilt shaft (106) has a first shoulder (110) interposed between the first inner cylinder portion (112) and the first outer cylinder portion (114);
the second tilt shaft (108) has a second shoulder (120) interposed between the second inner and outer column portions (122, 124);
the outer ring of the first bearing (128) abuts against the first shaft shoulder (110), and the inner ring is clamped by a locking ring (138);
the outer ring of the second bearing (129) abuts against the second shoulder (120), and the inner ring is clamped with a further clamping ring (138).
8. The method of claim 6, wherein one or both of the first operating end (118) and the second operating end (126) are of a hexagonal outer configuration.
9. The method of claim 6, wherein the aperture (132) of the swivel base (102) is a through-hole.
10. The method of claim 6, wherein the bore (132) of the swivel base (102) is a threaded bore and the first inner cylinder portion (112) has a threaded surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710096759.8A CN108458739B (en) | 2017-02-22 | 2017-02-22 | Rack with adjustable tilt axis and method of mounting a swivel base |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710096759.8A CN108458739B (en) | 2017-02-22 | 2017-02-22 | Rack with adjustable tilt axis and method of mounting a swivel base |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108458739A CN108458739A (en) | 2018-08-28 |
| CN108458739B true CN108458739B (en) | 2023-12-19 |
Family
ID=63220077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710096759.8A Active CN108458739B (en) | 2017-02-22 | 2017-02-22 | Rack with adjustable tilt axis and method of mounting a swivel base |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108458739B (en) |
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| CN102485181A (en) * | 2010-12-03 | 2012-06-06 | 张春霖 | Vertebral column navigation surgery robot based on virtual identification registration control |
| CN103284741A (en) * | 2012-02-28 | 2013-09-11 | 上海西门子医疗器械有限公司 | Bottom supporting component of CT (computed tomography) machine, rotary disk and CT machine |
| CN203428659U (en) * | 2013-09-05 | 2014-02-12 | 国家电网公司 | Small paying-off device with bearings |
| CN203524687U (en) * | 2013-07-09 | 2014-04-09 | 上海西门子医疗器械有限公司 | Tilted rack, rotating disc, and CT rack component of CT machine, and CT machine |
| CN105834815A (en) * | 2015-02-03 | 2016-08-10 | 株式会社捷太格特 | Feed apparatus and machine tool |
| CN106104249A (en) * | 2014-03-22 | 2016-11-09 | Ntn株式会社 | The experimental rig of thin-walled large size bearing |
| CN205733903U (en) * | 2016-07-06 | 2016-11-30 | 浙江海洋大学 | A kind of shaft shoulder inclined hole boring grab |
| CN206593682U (en) * | 2017-02-22 | 2017-10-27 | 上海西门子医疗器械有限公司 | Frame with adjustable sloping shaft |
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2017
- 2017-02-22 CN CN201710096759.8A patent/CN108458739B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11211449A (en) * | 1998-01-27 | 1999-08-06 | Mitsubishi Motors Corp | Feeder |
| CN201603690U (en) * | 2009-12-10 | 2010-10-13 | 洛阳轴研科技股份有限公司 | Screening device of centrifugal trace oil supply device |
| CN101968337A (en) * | 2010-09-26 | 2011-02-09 | 浙江天马轴承股份有限公司 | Roundness measuring instrument of large precision bearing ring |
| CN102485181A (en) * | 2010-12-03 | 2012-06-06 | 张春霖 | Vertebral column navigation surgery robot based on virtual identification registration control |
| CN103284741A (en) * | 2012-02-28 | 2013-09-11 | 上海西门子医疗器械有限公司 | Bottom supporting component of CT (computed tomography) machine, rotary disk and CT machine |
| CN203524687U (en) * | 2013-07-09 | 2014-04-09 | 上海西门子医疗器械有限公司 | Tilted rack, rotating disc, and CT rack component of CT machine, and CT machine |
| CN203428659U (en) * | 2013-09-05 | 2014-02-12 | 国家电网公司 | Small paying-off device with bearings |
| CN106104249A (en) * | 2014-03-22 | 2016-11-09 | Ntn株式会社 | The experimental rig of thin-walled large size bearing |
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| CN205733903U (en) * | 2016-07-06 | 2016-11-30 | 浙江海洋大学 | A kind of shaft shoulder inclined hole boring grab |
| CN206593682U (en) * | 2017-02-22 | 2017-10-27 | 上海西门子医疗器械有限公司 | Frame with adjustable sloping shaft |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108458739A (en) | 2018-08-28 |
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