CN111618784A - Rotary pin pulling device - Google Patents
Rotary pin pulling device Download PDFInfo
- Publication number
- CN111618784A CN111618784A CN202010318848.4A CN202010318848A CN111618784A CN 111618784 A CN111618784 A CN 111618784A CN 202010318848 A CN202010318848 A CN 202010318848A CN 111618784 A CN111618784 A CN 111618784A
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- screw
- puller
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- rotary pin
- rotary
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- 241000282414 Homo sapiens Species 0.000 claims description 13
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 4
- 238000010168 coupling process Methods 0.000 claims 4
- 238000005859 coupling reaction Methods 0.000 claims 4
- 230000033001 locomotion Effects 0.000 abstract description 7
- 238000005299 abrasion Methods 0.000 abstract description 3
- 230000033764 rhythmic process Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
- B25B27/023—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same using screws
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
Abstract
The invention relates to a rotary pin pulling device which comprises a base, a thread pulling rod and a rotary nut, wherein a through hole with a circular cross section is formed in the center of the base, the thread pulling rod penetrates through the through hole, the rotary nut is sleeved on the thread pulling rod and is abutted to the end face of the base, a connecting end is arranged on the thread pulling rod and is used for being connected with a connector, the connector is used for connecting a positioning pin, the thread pulling rod is driven to be pulled out through the rotary nut, the rotary nut continuously rotates and is converted into upward movement of the thread pulling rod, the pulling rhythm can be accurately controlled, the force is uniform, the abrasion of the positioning pin is reduced, and the safe operation of a unit is guaranteed.
Description
Technical Field
The invention relates to the field of maintenance, in particular to a rotary pin pulling device.
Background
The generator set needs to extract a large number of positioning pins in the mechanical maintenance process, the pin puller is a common tool in maintenance work, the common impact pin puller is used, or the pin puller is extracted in a knocking mode, the positioning pin is a precise component, the accuracy of the impact pin puller is reduced after the impact pin puller is extracted for many times, the normal work of the generator set is influenced, and potential safety hazards exist.
Disclosure of Invention
The present invention is directed to a rotary pin pulling apparatus to solve the above problems.
In order to achieve the purpose of the invention, the adopted technical scheme is that the rotary pin pulling device comprises a base, a threaded pulling rod and a rotary nut, wherein a through hole with a circular cross section is formed in the center of the base, the threaded pulling rod penetrates through the through hole, the rotary nut is sleeved on the threaded pulling rod and is abutted against the end face of the base, a connecting end is arranged on the threaded pulling rod and is used for being connected with a connecting head, and the connecting head is used for being connected with a positioning pin.
Furthermore, the thread pulling rod is provided with two limiting surfaces which are symmetrically arranged along the length direction of the thread pulling rod, the two limiting surfaces are parallel to each other, and the inner wall of the through hole, which is close to the rotating nut, is provided with two symmetrical limiting steps, so that the limiting steps are matched with the limiting surfaces to limit the rotation of the thread pulling rod.
Furthermore, the distance between the limiting surface and the small diameter of the screw-thread puller is half of the difference between the large diameter and the small diameter of the screw-thread puller.
Further, a ball bearing is provided on the base, and the swivel nut is abutted against the ball bearing.
Further, the ball bearing comprises an inner shaft and an outer shaft which are concentrically arranged, a side ball is arranged between the inner shaft and the outer shaft, and a lower ball is further arranged on the inner shaft and is in contact with the base.
Further, the connector includes top connection, lower clutch and connector, the top connection is hidden connection structure, the lower clutch is screwed joint.
Furthermore, the hidden connecting structure comprises an elastic connecting plate, one end of the elastic connecting plate is provided with a boss, and one end, far away from the boss, of the elastic connecting plate is connected to the connecting body, so that the elastic connecting plate surrounds a circumference, the boss is located on the inner side of the circumference, the connecting end is provided with an annular step, and the lower end face of the annular step is an inclined plane.
Furthermore, the thread-free pulling rod is provided with a thread-free section, the thread-free section is close to the connecting end, the thread-free section is sleeved with a unlocking ring, and the lower end face of the unlocking ring is an inclined plane and used for ejecting the boss to enable the boss to cross the annular step.
Furthermore, a reinforcing sleeve is sleeved on the outer wall of the base, and a plurality of reinforcing sleeves are continuously arranged.
Furthermore, an auxiliary bolt coaxial with the threaded pulling rod is fixedly arranged at one end, far away from the connecting end, of the threaded pulling rod.
The invention provides a rotary pin pulling device, wherein a screw thread pulling rod is driven to pull out through a rotary nut, the rotary nut continuously rotates and is converted into upward movement of the screw thread pulling rod, the pulling rhythm can be accurately controlled, the force is uniformly exerted, the abrasion of a positioning pin is reduced, and the safe operation of a unit is ensured.
Drawings
FIG. 1 is a schematic view of the overall structure of a drawing apparatus according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of the drawer in an embodiment of the present invention;
FIG. 3 is a cross-sectional view of another angle of the puller device in an embodiment of the present invention;
FIG. 4 is a schematic view of the construction of a threaded shank and components thereon according to an embodiment of the present invention;
FIG. 5 is a schematic view of a ball bearing in an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a connector according to an embodiment of the invention.
10-a base; 11-a limit step; 20-screw-thread pulling rod; 21-a limiting surface; 22-an annular step; 30-a swivel nut; 40-a connector; 41-an elastic connecting plate; 411-boss; 42-lower joint; 43-linker; 50-ball bearings; 51-the outer shaft; 52-the inner shaft; 53-side balls; 54-lower ball; 60-unlocking the ring; 70-auxiliary bolt.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the present invention is not limited thereto.
As shown in fig. 1-6:
the utility model provides a rotation type pin pulling device, includes base 10, screw dead man 20 and swivel nut 30, and it is circular shape through-hole to offer the cross-section in the base 10, and screw dead man 20 wears to establish in the through-hole, swivel nut 30 cup joint on screw dead man 20 and with base 10 terminal surface butt, be provided with the link on the screw dead man 20, the link is used for being connected with connector 40, connector 40 is used for connecting the locating pin.
The screw-thread pulling rod 20 penetrates through the through hole, the rotating nut 30 is sleeved on the screw-thread pulling rod 20, the positioning pin is connected with the screw-thread pulling rod 20 through the connector 40, the rotating nut 30 abuts against the end face of the base 10, and the rotating nut drives the screw-thread pulling rod 20 to pull the pin after being screwed.
Preferably, the screw-threaded drawing rod 20 is provided with two limiting surfaces 21 symmetrically arranged along the length direction of the screw-threaded drawing rod 20, the two limiting surfaces 21 are parallel to each other, and two symmetrical limiting steps 11 are arranged on the inner wall of the through hole close to the rotating nut 30, so that the limiting steps 11 cooperate with the limiting surfaces 21 to limit the rotation of the screw-threaded drawing rod 20.
During swivel nut 30 is rotatory, screw dead man 20 has the trend of follow motion, and then lead to the locating pin to have the pivoted trend, can increase the wearing and tearing of locating pin, spacing face 21 can directly be processed by screw dead man 20 through the mode of cutting and obtain, the spacing face 21 setting that the cutting formed is just parallel to each other in screw dead man 20 side, match with the accommodation space size that forms between the spacing step 11 of two relative settings on the through-hole inner wall, rotate with restriction screw dead man 20 through spacing step 11 cooperation spacing face 21, when carrying out the round pin operation, screw dead man 20 only is linear motion, reduce the wearing and tearing of locating pin.
Preferably, the distance between the stopper surface 21 and the small diameter of the screw 20 is half of the difference between the large diameter and the small diameter of the screw 20.
The rotary nut 30 drives the screw-thread puller 20 to move, the stress part is concentrated at the position where the screw thread is engaged, the pin pulling operation needs certain power output, and the strength of the screw thread is also required, it can be understood that, for each circle of screw thread, the thickness of the screw thread is gradually reduced from inside to outside, when the limit surface 21 is processed, the cut part is controlled within a half of the difference between the major diameter and the minor diameter, the screw thread continuity of each circle of screw thread can be ensured, the more the cut parts are, the integrity of the cut screw thread is gradually reduced, the less the cut part is, the limit surface 21 is narrower, once the rotation trend is violent, the situation similar to the abrasion of the edge angle of the screw nut can occur, and the function of limiting the rotation of the screw-thread puller 20 is lost.
Preferably, the base 10 is provided with a ball bearing 50, and the swivel nut 30 is brought into contact with the ball bearing 50.
When the swivel nut 30 is screwed, the swivel nut 30 abuts against the base 10, so that a large friction force exists, an operator cannot conveniently apply force, and the problem of wearing parts exists, the ball bearing 50 is additionally arranged, so that sliding friction between the swivel nut 30 and the base 10 is converted into rolling friction inside the ball bearing 50, the resistance is greatly reduced, and the parts are prevented from being worn.
Preferably, the ball bearing 50 includes an inner shaft 52 and an outer shaft 51 concentrically arranged, a side ball 53 is provided between the inner shaft 52 and the outer shaft 51, and a lower ball 54 is further provided on the inner shaft 52 such that the lower ball 54 contacts the base 10.
The whole device is controlled to work, the connection or contact and butt relations comprise a base 10 and a positioning pin mounting main body, a positioning pin and a connecting head 40, a connecting head 40 and a screw extractor 20, a rotating nut 30 and a screw extractor, a rotating nut 30 and a ball bearing 50, and a plurality of connection relations are cooperated with each other, the perfect state is that the axes or the rotating centers of all related parts are positioned on the same straight line, in fact, due to processes such as assembly, manufacture and the like, gaps exist among the parts or size deviation of the parts, and all parts are eccentric, the ball bearing 50 is provided with a side ball 53, when the inner shaft 52 and the outer shaft 51 move relatively, the device has a cheap allowance, and can reduce the movement or movement tendency of other directions except a standard extracting path caused by eccentricity.
Preferably, the connection head 40 includes an upper connection head, a lower connection head 42 and a connection body 43, the upper connection head is a concealed connection structure, and the lower connection head is a threaded connection head.
When the pin pulling operation is performed, the force output by the operator is mainly transmitted to the positioning pin through the interaction between the rotary nut 30 and the threaded pulling rod 20, and due to the interaction of the force, a reaction force exists between the base and the positioning pin mounting main body, which is actually a supporting relation, in order to form such a supporting relation, after the connection between the positioning pin and the connector 40 is completed, the base 10 can be well abutted against the positioning pin mounting main body, that is, the connection of the connector 40 needs to be performed at an unobservable position, and a hidden connection structure is arranged at the connector 40 to complete the operation.
Preferably, the concealed connecting structure includes elastic connecting plates 41, a boss 411 is disposed at one end of each elastic connecting plate 41, one ends of the elastic connecting plates 41 far away from the boss 411 are connected to the connecting body 40, the elastic connecting plates 41 surround a circumference, the bosses 411 are located on the inner side of the circumference, the connecting ends are provided with annular steps 22, and the lower end faces of the annular steps 22 are inclined planes.
Realize blind connection through hidden connection structure and link, the diameter of the circumference that boss 411 encloses is less than the external diameter of annular step 22, is greater than the internal diameter of annular step 22, because the inclined plane of terminal surface under the annular step 22, when boss 411 is at the in-process towards annular step 22 motion, elastic connection board 41 is propped open, after crossing annular step 22, the up end butt of the annular step 22 of being convenient for is in the same place.
Preferably, the threaded pull rod 20 is provided with a non-threaded section, the non-threaded section is close to the connecting end, the non-threaded section is sleeved with the unlocking ring 60, and the lower end face of the unlocking ring 60 is an inclined surface and used for ejecting the boss 411 to enable the boss 411 to cross the annular step 22.
The inclined surface of the lower end surface of the unlocking ring 60 moves towards the boss 411 to push the boss 411 open, so that the boss 411 is separated from the limit of the upper end surface of the annular step 22, and the detachment of the connector 40 is completed.
Preferably, a plurality of connectors 40 with the same upper connectors and different sizes of lower connectors 43 are arranged, so that the device can be used for pulling out positioning pins of various types.
As a preferable scheme, a reinforcing sleeve is sleeved on the outer wall of the base 10, a plurality of reinforcing sleeves are continuously arranged, the structure of the reinforcing sleeve is not shown in the figure, the reinforcing sleeve is a same-groove-shaped component with the same shape as the base 10, and the reinforcing sleeve is detachably fixed on the base 10 through a lock catch or a bolt and the like, so that the contact area between the base 10 and the positioning pin mounting main body can be increased, and the stability of the device in the use process is enhanced.
Preferably, an auxiliary bolt 70 coaxial with the screw extractor 20 is fixedly disposed at one end of the screw extractor 20 away from the connecting end, and when the positioning pin is connected, an initial relative position between the rotary nut 30 and the screw extractor 20 needs to be adjusted, which is convenient for an operator to operate.
In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "top", "root", "inner", "outer", "peripheral", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for the purpose of describing the present invention and simplifying the description, and do not indicate or imply that the device or element 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. Where "inside" refers to an interior or enclosed area or space. "periphery" refers to an area around a particular component or a particular area.
In the description of the embodiments of the present invention, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third", "fourth" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally 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.
In the description of the embodiments of the invention, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the embodiments of the present invention, it should be understood that "-" and "-" indicate the same range of two numerical values, and the range includes the endpoints. For example, "A-B" means a range greater than or equal to A and less than or equal to B. "A to B" means a range of not less than A and not more than B.
In the description of the embodiments of the present invention, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a rotation type pin pulling device which characterized in that: including base, screw dead man and swivel nut, the base is the centre and has been seted up the cross-section and be circular shape through-hole, the screw dead man wears to establish in the through-hole, swivel nut cup joints on the screw dead man and with base terminal surface butt, be provided with the link on the screw dead man, the link is used for being connected with the connector, the connector is used for connecting the locating pin.
2. The rotary pin puller according to claim 1, wherein the screw puller has two limiting surfaces symmetrically arranged along the length direction of the screw puller, the two limiting surfaces are parallel to each other, and two limiting steps are symmetrically arranged on the inner wall of the through hole close to the rotary nut, so that the limiting steps cooperate with the limiting surfaces to limit the rotation of the screw puller.
3. The rotary pin puller according to claim 2, wherein said stop surface is spaced from said shank by a distance which is half the difference between said major and minor diameters of said shank.
4. The rotary pin puller according to claim 1, wherein said base is provided with ball bearings, and said rotary nut is abutted against said ball bearings.
5. The rotary pin puller according to claim 4, wherein said ball bearings comprise concentrically disposed inner and outer shafts, said inner and outer shafts having side balls disposed therebetween, said inner shaft further having lower balls disposed thereon for contacting said lower balls with said base.
6. The rotary pin puller according to claim 1, wherein said coupling head comprises an upper head, a lower head and a coupling body, said upper head being of a concealed coupling construction and said lower head being a threaded coupling.
7. The rotary pin pulling device according to claim 6, wherein the hidden connection structure comprises an elastic connection plate, one end of the elastic connection plate is provided with a boss, one ends of the elastic connection plates, which are far away from the boss, are connected to the connection body, so that the elastic connection plates surround a circumference, the boss is located inside the circumference, the connection end is provided with an annular step, and the lower end surface of the annular step is an inclined surface.
8. The rotary pin puller according to claim 7, wherein the threaded puller rod is provided with a non-threaded section, the non-threaded section is adjacent to the connecting end, the non-threaded section is sleeved with a unlocking ring, and the lower end surface of the unlocking ring is an inclined surface for pushing the boss to enable the boss to pass over the annular step.
9. The rotary pin pulling apparatus as claimed in claim 1, wherein a reinforcing sleeve is sleeved on an outer wall of the base, and a plurality of the reinforcing sleeves are arranged in series.
10. The rotary pin puller according to claim 1, wherein an auxiliary bolt coaxial with said threaded puller is fixedly disposed at an end of said threaded puller remote from said attachment end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010318848.4A CN111618784A (en) | 2020-04-21 | 2020-04-21 | Rotary pin pulling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010318848.4A CN111618784A (en) | 2020-04-21 | 2020-04-21 | Rotary pin pulling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111618784A true CN111618784A (en) | 2020-09-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010318848.4A Pending CN111618784A (en) | 2020-04-21 | 2020-04-21 | Rotary pin pulling device |
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| CN (1) | CN111618784A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112677096A (en) * | 2020-12-18 | 2021-04-20 | 北京航星机器制造有限公司 | Pin pulling device suitable for interference fit locating pin |
| CN112975834A (en) * | 2021-01-20 | 2021-06-18 | 程勇 | Special tool for taking out positioning pin on matching surface of mechanical equipment |
| CN113069251A (en) * | 2021-03-26 | 2021-07-06 | 山东大学齐鲁医院(青岛) | Shin bone false body holder |
| CN114102517A (en) * | 2021-11-09 | 2022-03-01 | 中船澄西船舶修造有限公司 | Tool for disassembling whisk bolt |
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|---|---|---|---|---|
| EP0484930A1 (en) * | 1990-11-07 | 1992-05-13 | Man Ghh Logistics Gmbh | Puller and extractor for connecting pins |
| CN202572271U (en) * | 2012-03-30 | 2012-12-05 | 鞍钢股份有限公司 | Device for pulling out couple for blast furnace |
| CN104269965A (en) * | 2014-07-25 | 2015-01-07 | 深圳市恒德创新科技有限公司 | Motor and rotation control method |
| CN205968827U (en) * | 2016-08-24 | 2017-02-22 | 泉州市汉威机械制造有限公司 | Novel mechanism of pulling pin |
| CN207044086U (en) * | 2017-06-29 | 2018-02-27 | 重庆大唐国际彭水水电开发有限公司 | A kind of detachable pin removal |
| CN108340315A (en) * | 2018-03-29 | 2018-07-31 | 正和汽车科技（十堰）股份有限公司 | A kind of pin removal |
| CN208663665U (en) * | 2018-08-06 | 2019-03-29 | 中国长江电力股份有限公司 | Convenient for the pin pulling out device of observation |
| CN209491711U (en) * | 2019-01-14 | 2019-10-15 | 广西平班水电开发有限公司 | A kind of pin removal |
| CN209737491U (en) * | 2019-04-24 | 2019-12-06 | 国家电网有限公司 | Generator set thrust block and mirror plate pin disassembling tool |
| CN212287458U (en) * | 2020-04-21 | 2021-01-05 | 贵州乌江清水河水电开发有限公司 | Device is extracted to locating pin |
-
2020
- 2020-04-21 CN CN202010318848.4A patent/CN111618784A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0484930A1 (en) * | 1990-11-07 | 1992-05-13 | Man Ghh Logistics Gmbh | Puller and extractor for connecting pins |
| CN202572271U (en) * | 2012-03-30 | 2012-12-05 | 鞍钢股份有限公司 | Device for pulling out couple for blast furnace |
| CN104269965A (en) * | 2014-07-25 | 2015-01-07 | 深圳市恒德创新科技有限公司 | Motor and rotation control method |
| CN205968827U (en) * | 2016-08-24 | 2017-02-22 | 泉州市汉威机械制造有限公司 | Novel mechanism of pulling pin |
| CN207044086U (en) * | 2017-06-29 | 2018-02-27 | 重庆大唐国际彭水水电开发有限公司 | A kind of detachable pin removal |
| CN108340315A (en) * | 2018-03-29 | 2018-07-31 | 正和汽车科技（十堰）股份有限公司 | A kind of pin removal |
| CN208663665U (en) * | 2018-08-06 | 2019-03-29 | 中国长江电力股份有限公司 | Convenient for the pin pulling out device of observation |
| CN209491711U (en) * | 2019-01-14 | 2019-10-15 | 广西平班水电开发有限公司 | A kind of pin removal |
| CN209737491U (en) * | 2019-04-24 | 2019-12-06 | 国家电网有限公司 | Generator set thrust block and mirror plate pin disassembling tool |
| CN212287458U (en) * | 2020-04-21 | 2021-01-05 | 贵州乌江清水河水电开发有限公司 | Device is extracted to locating pin |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112677096A (en) * | 2020-12-18 | 2021-04-20 | 北京航星机器制造有限公司 | Pin pulling device suitable for interference fit locating pin |
| CN112975834A (en) * | 2021-01-20 | 2021-06-18 | 程勇 | Special tool for taking out positioning pin on matching surface of mechanical equipment |
| CN113069251A (en) * | 2021-03-26 | 2021-07-06 | 山东大学齐鲁医院(青岛) | Shin bone false body holder |
| CN114102517A (en) * | 2021-11-09 | 2022-03-01 | 中船澄西船舶修造有限公司 | Tool for disassembling whisk bolt |
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