CN114310362A - Locking mechanism and servo revolving stage - Google Patents
Locking mechanism and servo revolving stage Download PDFInfo
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- CN114310362A CN114310362A CN202210052609.8A CN202210052609A CN114310362A CN 114310362 A CN114310362 A CN 114310362A CN 202210052609 A CN202210052609 A CN 202210052609A CN 114310362 A CN114310362 A CN 114310362A
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- 230000007246 mechanism Effects 0.000 title claims abstract description 28
- 238000001125 extrusion Methods 0.000 claims abstract description 40
- 238000003825 pressing Methods 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims 2
- 238000007906 compression Methods 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000033001 locomotion Effects 0.000 description 5
- 238000003754 machining Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention provides a locking mechanism and a servo turntable, which relate to the technical field of production line equipment, and the locking mechanism provided by the invention comprises: the outer circle locking part, the inner circle locking part and the tensioning device are arranged on the outer circle; the outer circle locking piece is provided with a base part and a clamping part, and the base part and the clamping part are arranged at intervals; the inner locking part is arranged between the base part and the clamping part, an expansion extrusion area is formed between the base part and the inner locking part, and a clamping area is formed between the clamping part and the inner locking part; the tensioning device is used for extending into the expansion extrusion area and reducing the distance between the clamping part and the inner circle locking part. According to the locking mechanism and the servo turntable provided by the invention, the clamping area between the clamping part and the inner locking part can be used for clamping the turntable or other moving devices, so that stable braking can be realized through clamping, and the stability of locking or braking is improved.
Description
Technical Field
The invention relates to the technical field of production line equipment, in particular to a locking mechanism and a servo turntable.
Background
In the operation process of an automatic production line, a rotary table is generally required to be used for rotating a workpiece. The rotating speed of the rotary table directly influences the steering speed of the workpiece, and further relates to the machining efficiency of the workpiece. However, if the turntable is operated quickly, accurate braking is difficult at a predetermined position, and the accuracy of the orientation of the workpiece varies, which adversely affects the subsequent machining accuracy. Under the condition of additionally arranging the braking device, the braking device can only act on one side surface of the rotating part by means of friction resistance, the braking force of the rotary table along the circumferential direction is not uniformly distributed, the stability of the rotary table is influenced, the braking sensitivity of the conventional braking device is poor, and the braking requirement of the high-precision rotary table is difficult to meet.
Disclosure of Invention
The invention aims to provide a locking mechanism and a servo turntable so as to improve the locking stability of the locking mechanism.
In a first aspect, the present invention provides a locking mechanism comprising: the outer circle locking part, the inner circle locking part and the tensioning device are arranged on the outer circle;
the outer circle locking piece is provided with a base part and a clamping part, and the base part and the clamping part are arranged at intervals;
the inner locking part is arranged between the base part and the clamping part, an expansion and extrusion area is formed between the base part and the inner locking part, and a clamping area is formed between the clamping part and the inner locking part;
the tensioning device is used for extending into the expansion extrusion area and reducing the distance between the clamping part and the inner locking part.
With reference to the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein the base portion is provided with a first recess, and the inner circular locking member is provided with a second recess;
the first groove is opposite to the second groove and is respectively sunken towards the direction away from the second groove;
the first groove and the second groove form the expansion extrusion area.
With reference to the first aspect, the present disclosure provides a second possible implementation manner of the first aspect, wherein the expansion extrusion region includes pilot holes;
the guiding hole is formed between the base part and the inner circle locking part;
the radial size of the pilot hole is gradually reduced along the axial direction of the pilot hole.
With reference to the second possible implementation manner of the first aspect, the present invention provides a third possible implementation manner of the first aspect, wherein the expansion extrusion region further includes a mounting hole, and the mounting hole is coaxial with and communicates with the pilot hole;
the mounting hole is located the aperture end of leading the pilot hole, just the mounting hole with the aperture end's of leading the pilot hole diameter equals.
With reference to the first aspect, the present invention provides a fourth possible implementation manner of the first aspect, wherein the tensioning device includes: a first squeeze driven member and a ball;
the ball body is in transmission connection with the first extrusion driving part and is inserted in the expansion extrusion area.
With reference to the fourth possible implementation manner of the first aspect, the present invention provides a fifth possible implementation manner of the first aspect, wherein the first extrusion driver comprises: a cylinder and a piston;
the piston is inserted into the cylinder body and abuts against the ball body.
With reference to the fourth possible implementation manner of the first aspect, the present invention provides a sixth possible implementation manner of the first aspect, wherein the tensioning device further includes a second pressing driving element, and the second pressing driving element is configured to push against an end surface of the ball body, which is away from the first pressing driving element.
With reference to the sixth possible implementation manner of the first aspect, the invention provides a seventh possible implementation manner of the first aspect, wherein the outer circular locking member is provided with an abdicating sliding groove, and the second extrusion driving member passes through the abdicating sliding groove and abuts against the ball.
In a second aspect, the present invention provides a servo turntable comprising: the locking mechanism comprises a base, a workbench, a turntable and the locking mechanism provided by the first aspect;
the rotary table is rotationally connected to the base, and the workbench is connected with the rotary table;
the rotary disc is inserted in the clamping area.
With reference to the second aspect, the present invention provides a first possible implementation manner of the second aspect, wherein a worm driving device is installed on the base, a worm wheel is installed on the turntable, the worm wheel is coaxial with the turntable, and the worm wheel and the worm driving device are in matched transmission.
The embodiment of the invention has the following beneficial effects: adopt the outer circle retaining member to be equipped with base portion and clamping part, base portion and clamping part interval set up, interior round retaining member is installed between base portion and clamping part, form inflation extrusion region between base portion and the interior round retaining member, form the clamping region between clamping part and the interior round retaining member, stretch into inflation extrusion region through tight device that rises, thereby it keeps away from each other with interior round retaining member to push away base portion, and then make the interval of clamping part and interior round retaining member reduce, the clamping region between clamping part and the interior round retaining member can be used to centre gripping carousel or other motion devices, can realize stable braking through the centre gripping from this, the stability of locking or braking has been improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a cross-sectional view of a locking mechanism provided by an embodiment of the present invention;
FIG. 2 is a schematic view of an outer circular locking member and an inner circular locking member of the locking mechanism provided in an embodiment of the present invention;
FIG. 3 is a cross-sectional view of the outer circular locking member and the inner circular locking member of the locking mechanism provided in the embodiment of the present invention;
FIG. 4 is a schematic diagram of a servo turntable provided in an embodiment of the present invention;
fig. 5 is a cross-sectional view of a servo turntable according to an embodiment of the present invention.
Icon: 001-expansion extrusion zone; 101-pilot hole; 102-mounting holes; 103-abdicating sliding grooves; 002-clamping area; 100-an outer circle locking piece; 110-a base part; 111-a first recess; 120-a clamping portion; 200-inner circular locking piece; 201-a second groove; 300-tensioning devices; 310-a first extruded drive member; 311-cylinder body; 312-a piston; 320-sphere; 330-a second extrusion drive; 331-torr plug; 332-a base; 400-a machine base; 500-a workbench; 600-a turntable; 700-worm drive means; 800-worm wheel.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "physical quantity" in the formula, unless otherwise noted, is understood to mean a basic quantity of a basic unit of international system of units, or a derived quantity derived from a basic quantity by a mathematical operation such as multiplication, division, differentiation, or integration.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
As shown in fig. 1, 2 and 3, the locking mechanism provided by the embodiment of the present invention includes: the outer circular locking member 100, the inner circular locking member 200 and the tensioning device 300; the outer circular locking piece 100 is provided with a base part 110 and a clamping part 120, wherein the base part 110 and the clamping part 120 are arranged at intervals; the inner circular locker 200 is installed between the base part 110 and the grip part 120, an expansion pressing region 001 is formed between the base part 110 and the inner circular locker 200, and a grip region 002 is formed between the grip part 120 and the inner circular locker 200; the tensioning device 300 is used for extending into the expansion extrusion area 001 and reducing the distance between the clamping portion 120 and the inner circular locking member 200.
Specifically, the tensioning device 300 can extend into the expansion extrusion region 001, and the base portion 110 and the inner circular locking member 200 are extruded by the tensioning device 300, so that the base portion 110 and the inner circular locking member 200 can be far away from each other, and the distance between the clamping portion 120 and the inner circular locking member 200 is reduced. The holding section 002 can be used for holding the motion device, and when the distance between the holding part 120 and the inner circular locking part 200 is reduced, the motion device is clamped between the holding part 120 and the inner circular locking part 200, thereby realizing locking and braking of the motion device and improving the locking stability.
As shown in fig. 1 and 2, in the embodiment of the present invention, the base part 110 is provided with the first recess 111, and the inner circular locking member 200 is provided with the second recess 201; the first groove 111 is opposite to the second groove 201 and is recessed towards the opposite direction; the first groove 111 and the second groove 201 form an expansion extrusion region 001 therebetween.
Specifically, the first groove 111 and the second groove 201 respectively have a semi-cylindrical surface, and in an initial state, the first groove 111 is spliced with the second groove 201, so that the expansion extrusion region 001 forms a through hole with a circular cross section. When the tensioning device 300 extends into the expansion extrusion region 001, the base portion 110 and the inner circular locking member 200 are pushed, so that the base portion 110 and the inner circular locking member 200 are far away from each other, and therefore the distance between the clamping portion 120 and the inner circular locking member 200 is reduced, so that the moving device can be clamped in the clamping region 002.
As shown in fig. 1 and 3, the expansion extrusion zone 001 includes pilot holes 101; a pilot hole 101 is formed between the base part 110 and the inner circular locking member 200; the radial dimension of pilot hole 101 decreases in the axial direction of pilot hole 101.
Specifically, the side wall of the guiding hole 101 is an inclined or arc curved surface, and the tensioning device 300 can be inserted into the expansion extrusion region 001 from the end with the larger aperture, so as to ensure that the tensioning device 300 is aligned with the expansion extrusion region 001.
Further, the expansion extrusion area 001 further comprises a mounting hole 102, and the mounting hole 102 is coaxial with and communicated with the pilot hole 101;
the mounting hole 102 is located at the small-bore end of the pilot hole 101, and the diameter of the mounting hole 102 is equal to that of the small-bore end of the pilot hole 101.
Specifically, the tensioning device 300 includes: a first squeeze driver 310, a ball 320, and a second squeeze driver 330. In an initial state, the ball 320 is located in the guiding hole 101, the ball 320 can be pushed to move into the mounting hole 102 by the first pressing driving member 310, and the distance between the clamping portion 120 and the inner circular locking member 200 is reduced as the ball 320 moves towards the small-aperture end of the guiding hole 101; when it is necessary to release the locking, the second pressing actuator 330 pushes the ball 320 in the reverse direction through the mounting hole 102, and the ball 320 moves toward the large-diameter end of the guide hole 101, thereby releasing the clamping force of the grip 120 and the inner circular locking member 200 to the moving device.
As shown in fig. 1 and 3, the tensioning device 300 includes: a first squeeze driver 310 and a ball 320; the ball 320 is in transmission connection with the first extrusion driving member 310, and the ball 320 is inserted into the expansion extrusion region 001.
Specifically, the diameter of the ball 320 is larger than the diameter of the small-bore end of the pilot hole 101, and the ball 320 can be pushed to move towards the small-bore end of the pilot hole 101 by the first extrusion driving member 310, so as to expand the expansion extrusion region 001 and reduce the distance between the clamping portion 120 and the inner circular locking member 200.
In one embodiment, the first pressing driving member 310 is an air cylinder, a hydraulic cylinder or an electric telescopic cylinder, and the ball 320 can be pushed to move toward the inside of the expansion extrusion region 001 by extending the first pressing driving member 310.
In this embodiment, the first pressing driver 310 includes: a cylinder 311 and a piston 312;
the piston 312 is inserted into the cylinder 311, and the piston 312 abuts against the ball 320.
Fluid is injected into the cylinder 311 by a pneumatic drive or a hydraulic drive, and the pressure of the fluid acts on the end surface of the piston 312 facing away from the ball 320, so that the piston 312 and thus the ball 320 can be pushed to move towards the inside of the expansion extrusion region 001.
Further, the tensioning device 300 further includes a second pressing driving element 330, and the second pressing driving element 330 is used for pushing against an end surface of the ball 320 away from the first pressing driving element 310. The second extrusion driver 330 includes: the supporting plug 331 is connected with the base 332 in a sliding mode, the supporting plug 331 is driven to slide relative to the base 332 in a pneumatic driving mode, a hydraulic driving mode or a crank link driving mode, the supporting plug 331 penetrates through the mounting hole 102 to push the ball 320, and when the first extrusion driving part 310 contracts, the second extrusion driving part 330 is pressurized, so that the ball 320 can move towards the large-aperture end of the guide hole 101, and the clamping force of a moving device in the clamping area 002 is relieved.
Further, the outer circular locking member 100 is provided with a yielding chute 103, and the second extrusion driving member 330 passes through the yielding chute 103 and abuts against the ball 320.
Specifically, the second pressing driving member 330 is coaxial with the mounting hole 102, when in use, the cylinder 311 and the base 332 are fixed relative to the frame, the outer circular locking member 100 and the inner circular locking member 200 both slide relative to the base 332, and the yielding chute 103 provides a mounting space for the second pressing driving member 330, thereby preventing the second pressing driving member 330 from obstructing the movement of the inner circular locking member 200. During the locking process, the grip portion 120 moves toward the inner circular locker 200, thereby improving the sensitivity of the locking action.
In addition, the end surface of the cylinder body 311 facing the inner circular locking member 200 is provided with a sliding groove, the inner circular locking member 200 is fitted in the sliding groove, and the inner circular locking member 200 is limited and guided by the sliding groove provided on the cylinder body 311, so that the inner circular locking member 200 can only reciprocate in the left-right direction shown in fig. 1.
Example two
As shown in fig. 1, 4 and 5, a servo turntable according to an embodiment of the present invention includes: the stand 400, the workbench 500, the turntable 600 and the locking mechanism provided by the above embodiment; the turntable 600 is rotatably connected to the base 400, and the worktable 500 is connected to the turntable 600; the turntable 600 is inserted in the clamping area 002.
Specifically, the locking mechanisms are arranged in a plurality and are arranged at intervals along the circumferential direction of the turntable 600, and the turntable 600 is clamped or loosened simultaneously through the locking mechanisms, so that the braking force received by the turntable 600 is uniformly distributed along the circumference, the locking stability and reliability are improved, and the workbench 500 is kept stable in the machining process.
In the embodiment of the present invention, the base 400 is provided with the worm driving device 700, the turntable 600 is provided with the worm wheel 800, the worm wheel 800 is coaxial with the turntable 600, and the worm wheel 800 and the worm driving device 700 are in matched transmission.
The worm driving device 700 drives the worm to rotate through the servo motor, the worm drives the worm wheel 800 to rotate through the worm, and then the turntable 600 and the workbench 500 are driven to rotate synchronously, high-precision swing rotation can be achieved, and the worm driving device is suitable for steering operation of precision parts in the machining process. In addition, the servo turntable has the technical effect of the locking mechanism, and the description is omitted here.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A locking mechanism, comprising: the device comprises an outer circular locking piece (100), an inner circular locking piece (200) and a tensioning device (300);
the outer circle locking piece (100) is provided with a base part (110) and a clamping part (120), and the base part (110) and the clamping part (120) are arranged at intervals;
the inner circular locking piece (200) is installed between the base part (110) and the clamping part (120), an expansion and extrusion area (001) is formed between the base part (110) and the inner circular locking piece (200), and a clamping area (002) is formed between the clamping part (120) and the inner circular locking piece (200);
the tensioning device (300) is used for extending into the expansion extrusion area (001) and enabling the distance between the clamping part (120) and the inner circular locking piece (200) to be reduced.
2. The locking mechanism according to claim 1, wherein the base portion (110) is provided with a first recess (111), and the inner circular locking member (200) is provided with a second recess (201);
the first groove (111) is opposite to the second groove (201) and is respectively sunken towards the direction away from the first groove;
the first groove (111) and the second groove (201) form the expansion extrusion area (001) therebetween.
3. Locking mechanism according to claim 1, characterized in that the expansion-squeeze zone (001) comprises a pilot hole (101);
the pilot hole (101) is formed between the base part (110) and the inner circular locking part (200);
the radial dimension of the pilot hole (101) is gradually reduced along the axial direction of the pilot hole (101).
4. The latching mechanism of claim 3, wherein the expansion extrusion zone (001) further comprises a mounting hole (102), the mounting hole (102) being coaxial with and in communication with the pilot hole (101);
the mounting hole (102) is located at the small-aperture end of the pilot hole (101), and the diameters of the mounting hole (102) and the small-aperture end of the pilot hole (101) are equal.
5. The locking mechanism according to claim 1, wherein the tensioning device (300) comprises: a first compression driver (310) and a ball (320);
the ball body (320) is in transmission connection with the first extrusion driving part (310), and the ball body (320) is inserted into the expansion extrusion area (001).
6. The latching mechanism of claim 5, wherein the first compression driver (310) comprises: a cylinder (311) and a piston (312);
the piston (312) is inserted into the cylinder (311), and the piston (312) abuts against the ball (320).
7. The locking mechanism according to claim 5, wherein the tensioning device (300) further comprises a second pressing drive member (330), the second pressing drive member (330) being configured to push against an end surface of the ball (320) facing away from the first pressing drive member (310).
8. The locking mechanism according to claim 7, wherein the outer circular locking member (100) is provided with an abdicating chute (103), and the second pressing driving member (330) passes through the abdicating chute (103) and abuts against the ball (320).
9. A servo turret, comprising: -a stand (400), a table (500), a turntable (600) and a locking mechanism according to any of claims 1-8;
the rotary table (600) is rotationally connected to the base (400), and the workbench (500) is connected with the rotary table (600);
the rotary table (600) is inserted into the clamping area (002).
10. Servo turntable according to claim 9, characterized in that the base (400) is mounted with a worm drive means (700), the turntable (600) is mounted with a worm wheel (800), the worm wheel (800) is coaxial with the turntable (600), and the worm wheel (800) is in transmission fit with the worm drive means (700).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210052609.8A CN114310362A (en) | 2022-01-18 | 2022-01-18 | Locking mechanism and servo revolving stage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210052609.8A CN114310362A (en) | 2022-01-18 | 2022-01-18 | Locking mechanism and servo revolving stage |
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| Publication Number | Publication Date |
|---|---|
| CN114310362A true CN114310362A (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210052609.8A Pending CN114310362A (en) | 2022-01-18 | 2022-01-18 | Locking mechanism and servo revolving stage |
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| Country | Link |
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| CN (1) | CN114310362A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1308563A (en) * | 1969-06-21 | 1973-02-21 | Olivetti & Co Spa | Machine tool with rotary work-table |
| CN2402440Y (en) * | 1999-10-27 | 2000-10-25 | 游玉梅 | Clamp structure of working machine |
| DE19946424A1 (en) * | 1999-09-28 | 2001-04-05 | Deckel Maho Gmbh | Rotating or swiveling device of a machine tool |
| CN201871949U (en) * | 2010-11-23 | 2011-06-22 | 营口重型机床集团有限公司 | Numerically-controlled rotary worktable |
| CN205309801U (en) * | 2015-12-22 | 2016-06-15 | 郑维明 | Numerically -controlled rotary workbench |
| CN205703298U (en) * | 2016-04-13 | 2016-11-23 | 上海波宏特电器部件有限公司 | A kind of low-speed highly precise rotating table of numerical control machine |
| CN208132451U (en) * | 2018-03-30 | 2018-11-23 | 北京驹创鼎盛科技发展有限公司 | A kind of numerically-controlled machine tool special fixture |
| CN208304867U (en) * | 2018-06-07 | 2019-01-01 | 昆山科友机械有限公司 | A kind of frock clamp |
-
2022
- 2022-01-18 CN CN202210052609.8A patent/CN114310362A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1308563A (en) * | 1969-06-21 | 1973-02-21 | Olivetti & Co Spa | Machine tool with rotary work-table |
| DE19946424A1 (en) * | 1999-09-28 | 2001-04-05 | Deckel Maho Gmbh | Rotating or swiveling device of a machine tool |
| CN2402440Y (en) * | 1999-10-27 | 2000-10-25 | 游玉梅 | Clamp structure of working machine |
| CN201871949U (en) * | 2010-11-23 | 2011-06-22 | 营口重型机床集团有限公司 | Numerically-controlled rotary worktable |
| CN205309801U (en) * | 2015-12-22 | 2016-06-15 | 郑维明 | Numerically -controlled rotary workbench |
| CN205703298U (en) * | 2016-04-13 | 2016-11-23 | 上海波宏特电器部件有限公司 | A kind of low-speed highly precise rotating table of numerical control machine |
| CN208132451U (en) * | 2018-03-30 | 2018-11-23 | 北京驹创鼎盛科技发展有限公司 | A kind of numerically-controlled machine tool special fixture |
| CN208304867U (en) * | 2018-06-07 | 2019-01-01 | 昆山科友机械有限公司 | A kind of frock clamp |
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Application publication date: 20220412 |