CN112922941A - Positioning method of slewing bearing - Google Patents
Positioning method of slewing bearing Download PDFInfo
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- CN112922941A CN112922941A CN202110032837.4A CN202110032837A CN112922941A CN 112922941 A CN112922941 A CN 112922941A CN 202110032837 A CN202110032837 A CN 202110032837A CN 112922941 A CN112922941 A CN 112922941A
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- inner ring
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000007704 transition Effects 0.000 claims description 17
- 230000004323 axial length Effects 0.000 description 21
- 230000008878 coupling Effects 0.000 description 13
- 238000010168 coupling process Methods 0.000 description 13
- 238000005859 coupling reaction Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000013459 approach Methods 0.000 description 5
- 210000001503 joint Anatomy 0.000 description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
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- 230000008859 change Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/02—Bolts or sleeves for positioning of machine parts, e.g. notched taper pins, fitting pins, sleeves, eccentric positioning rings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/84—Slewing gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
Abstract
The present disclosure provides a positioning method of a slewing bearing, including: installing the first end of the first positioning pin and the first ends of the at least two second positioning pins on the connecting screw holes of the inner ring; the inner ring is controlled to be close to the base, so that the second end of the first positioning pin and the second end of the second positioning pin are inserted into the corresponding connecting through holes in the base; controlling the inner ring to move towards the base, so that the first accurate positioning section of the first positioning pin enters the corresponding connecting through hole in the base, and preliminarily positioning the inner ring; continuously controlling the inner ring to move towards the base, so that second accurate positioning sections of the at least two second positioning pins enter the corresponding connecting through holes in the base, and accurately positioning the inner ring; and after the inner ring is jointed with the base, the first positioning pin and the second positioning pin are taken down from the connecting through hole of the base, and the positioning of the slewing bearing is completed. The positioning device can ensure the positioning precision of the connecting screw hole of the inner ring and the connecting through hole of the base, and is convenient for rapidly completing the assembly of the slewing bearing.
Description
Technical Field
The disclosure relates to the technical field of mechanical assembly, in particular to a positioning method of a slewing bearing.
Background
The slewing bearing is an important part of crane equipment and comprises an outer ring, an inner ring and an intermediate rolling body, wherein the intermediate rolling body is arranged between the outer ring and the inner ring so that the outer ring and the inner ring can rotate relatively. The slewing bearing is usually connected between a crane body and a base of the crane, wherein an outer ring is connected with the crane body, an inner ring is connected with the base, and the slewing bearing realizes the slewing of the crane through the relative rotation between the inner ring and the outer ring.
In the related art, the end face of the inner ring of the slewing bearing is provided with circumferentially arranged connecting screw holes, the end face of the base connected with the end face of the inner ring is also provided with circumferentially arranged connecting through holes, the connecting screw holes in the inner ring correspond to the connecting through holes in the base one to one, and when the inner ring is connected with the base, bolts penetrate through the connecting through holes in the base to be connected with the connecting screw holes in the inner ring.
However, the number of the connection screw holes of the inner ring and the connection screw holes of the base are large. Therefore, in the process of positioning and connecting the inner ring of the slewing bearing and the base, the coaxiality of the connecting screw hole of the inner ring and the corresponding connecting through hole on the base must be accurately ensured, otherwise, the connecting screw hole on the inner ring of the slewing bearing and the corresponding connecting through hole on the base are easily dislocated, and the assembly precision of the slewing bearing is further influenced.
Disclosure of Invention
The embodiment of the disclosure provides a positioning method of a slewing bearing, which can ensure the positioning accuracy of a connecting screw hole of an inner ring of the slewing bearing and a connecting through hole of a base and is convenient for rapidly completing the assembly of the slewing bearing. The technical scheme is as follows:
the embodiment of the disclosure provides a positioning method of a slewing bearing, which comprises the following steps: the first end of the first positioning pin and the first ends of the at least two second positioning pins are both arranged on the connecting screw hole of the inner ring of the slewing bearing, the first positioning pin and the at least two second positioning pins are arranged at intervals, the first positioning pin comprises a first preliminary positioning section and a first precise positioning section which are sequentially connected, the first precise positioning section is used for being in transition fit with the connecting through hole of the base, the diameter of the first preliminary positioning section is smaller than that of the first accurate positioning section, the second positioning pin comprises a second preliminary positioning section and a second accurate positioning section which are sequentially connected, the second accurate positioning section is used for being in transition fit with the connecting through hole of the base, the diameter of the second preliminary positioning section is smaller than that of the second precise positioning section, the lengths of the first positioning pin and the second positioning pin are the same, and the length of the first preliminary positioning section is smaller than that of the second preliminary positioning section; controlling the inner ring of the slewing bearing to be close to the base, and enabling the second end of the first positioning pin and the second end of the second positioning pin to be inserted into the corresponding connecting through holes in the base; controlling the inner ring of the slewing bearing to move towards the base, so that the first accurate positioning section of the first positioning pin enters the corresponding connecting through hole in the base, and preliminarily positioning the inner ring of the slewing bearing; continuously controlling the inner ring of the slewing bearing to move towards the base, so that the second accurate positioning sections of the at least two second positioning pins enter the corresponding connecting through holes in the base, and accurately positioning the inner ring of the slewing bearing; and after the inner ring of the slewing bearing is jointed with the base, the first positioning pin and the second positioning pin are taken down from the connecting through hole of the base, and the positioning of the slewing bearing is completed.
In an implementation manner of the embodiment of the present disclosure, the first preliminary positioning section includes a first guide cone and a first positioning cylinder that link to each other, the first guide cone is close to the second end of first positioning pin, the main aspects of the first guide cone with the first positioning cylinder is connected, the second preliminary positioning section includes a second guide cone and a second positioning cylinder that link to each other, the second guide cone is close to the second end of second positioning pin, the main aspects of the second guide cone with the second positioning cylinder is connected, the length of the first guide cone with the length of the second guide cone is the same, the length of the first positioning cylinder is less than the length of the second positioning cylinder.
In another implementation manner of the embodiment of the present disclosure, the controlling the inner ring of the pivoting support to approach the base so that the second end of the first positioning pin and the second end of the second positioning pin are inserted into the corresponding connecting through holes in the base includes: controlling the first guiding cone to gradually enter the connecting through hole of the base, and correcting the concentricity of the first positioning pin and the connecting through hole of the base through the outer wall surface of the first guiding cone and the inner wall surface of the connecting through hole of the base until the first positioning cylinder enters the connecting through hole of the base; and controlling the second guide cone to gradually enter the connecting through hole of the base, and correcting the concentricity of the second positioning pin and the connecting through hole of the base through the outer wall surface of the second guide cone and the inner wall surface of the connecting through hole of the base until the second positioning cylinder enters the connecting through hole of the base.
In another implementation manner of the embodiment of the present disclosure, the first accurate positioning section includes a first guiding circular truncated cone and a first accurate positioning circular cylinder in transition fit with the connection through hole of the base, a large end of the first guiding circular truncated cone is connected to the first accurate positioning circular cylinder, a small end of the first guiding circular truncated cone is connected to the first positioning circular cylinder, and a diameter of the first accurate positioning circular cylinder is greater than a diameter of the first positioning circular cylinder.
In another implementation manner of the embodiment of the present disclosure, the controlling the inner ring of the slewing bearing to move towards the base, so that the first precise positioning section of the first positioning pin enters the corresponding connecting through hole in the base, and the primarily positioning of the inner ring of the slewing bearing includes: and controlling the inner ring of the slewing bearing to move towards the base, enabling the first guide circular truncated cone body to gradually enter the connecting through hole of the base, and correcting the concentricity of the first positioning pin and the connecting through hole of the base to a set tolerance through the outer wall surface of the first guide circular truncated cone body and the inner wall surface of the connecting through hole of the base until the first accurate positioning cylinder enters the connecting through hole of the base.
In another implementation manner of the embodiment of the present disclosure, the second precise positioning section includes a second semi-precise circular truncated cone, a second semi-precise cylinder, a second full-precise circular truncated cone and a second full-precise cylinder used for transition fit with the connection through hole of the base, the second positioning cylinder is connected with the small end of the second semi-precise circular truncated cone, the large end of the second semi-precise circular truncated cone is connected with one end of the second semi-precise cylinder, the other end of the second semi-precise cylinder is connected with the small end of the second full-precise circular truncated cone, the large end of the second full-precise circular truncated cone is connected with the second full-precise cylinder, the diameter of the second semi-precise cylinder is greater than the diameter of the second positioning cylinder, and the diameter of the second full-precise cylinder is greater than the diameter of the second semi-precise cylinder.
In another implementation manner of the embodiment of the present disclosure, the continuously controlling the inner ring of the slewing bearing to move toward the base, so that the second accurate positioning sections of the at least two second positioning pins enter the corresponding connecting through holes in the base, and accurately positioning the inner ring of the slewing bearing includes: controlling the inner ring of the slewing bearing to move towards the base, enabling the second semi-fine circular truncated cone body to gradually enter the connecting through hole of the base, and correcting the concentricity of the second positioning pin and the connecting through hole of the base to an initial tolerance through the outer wall surface of the second semi-fine circular truncated cone body and the inner wall surface of the connecting through hole of the base until the second semi-fine circular cylinder body enters the connecting through hole of the base; and continuously controlling the inner ring of the slewing bearing to move towards the base, enabling the second full-precision circular truncated cone body to gradually enter the connecting through hole of the base, and correcting the concentricity of the second positioning pin and the connecting through hole of the base to a set tolerance through the outer wall surface of the second full-precision circular truncated cone body and the inner wall surface of the connecting through hole of the base until the second full-precision circular truncated cone body enters the connecting through hole of the base.
In another implementation of the disclosed embodiment, the initial tolerance is 1mm and the set tolerance is 0.5 mm.
In another implementation manner of the embodiment of the present disclosure, the outer wall surface of the first preliminary positioning section and the outer wall surface of the second preliminary positioning section are both provided with a clamping plane.
In another implementation of the embodiment of the present disclosure, the first end of the first locating pin and the first end of the second locating pin are both provided with external threads.
The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:
the embodiment of the disclosure provides a positioning method of a slewing bearing, which is to install a first positioning pin and at least two second positioning pins on an inner ring of the slewing bearing, namely to install at least three positioning pins on a connecting screw hole of the inner ring. And then, controlling the inner ring of the slewing bearing to be close to the base so that the slewing bearing drives the first positioning pin and the second positioning pin to move towards the base, and controlling the first positioning pin and the second positioning pin to be inserted into corresponding connecting through holes in the base.
Because the length of first preliminary location section is less than the length of the preliminary location section of second, consequently, when the inner circle that continues control slewing bearing was close to the base, compare in the second accurate positioning section of second locating pin, the first accurate positioning section of first locating pin can be preferred to get into in the connect the through hole of base. Because the first accurate positioning section is in transition fit with the connecting through hole of the base, the connecting screw hole of the first positioning pin and the connecting through hole of the base are inserted on the slewing bearing for accurate positioning, namely, the accurate positioning of a single connecting screw hole on the inner ring is realized. And, in the in-process that first accurate positioning section inserted the connect through hole of base, the second locating pin still is the preliminary positioning section of second and is located the connect through hole of base, still remain great clearance between the connect through hole of second locating pin and base promptly, make first locating pin can be on the plane that is on a parallel with the inner circle terminal surface and at certain extent free movement, so that first accurate positioning section can insert the connect through hole of base more easily in, make the connect through hole transition fit of first locating pin and base, realize the preliminary positioning of inner circle.
In the process of continuously controlling the inner ring of the slewing bearing to be close to the base, the first accurate positioning section of the first positioning pin is always in the connecting through hole of the base, namely, the first positioning pin keeps a connecting screw hole of the inner ring and a connecting through hole of the base in an accurate butt joint state; because the second accurate positioning section is transition fit with the connecting through hole of the base, after the second accurate positioning section is inserted into the connecting through hole of the base, the connecting screw hole of the second positioning pin and the connecting through hole of the base are also accurately positioned on the slewing bearing in an inserting manner, at least two second positioning pins are arranged, namely, the accurate positioning of at least three connecting screw holes on the inner ring is realized, and the plurality of positioning pins are arranged at intervals along the circumferential direction of the inner ring, namely, the three-point surface fixing manner is utilized to ensure that all the connecting screw holes on the slewing bearing are concentric with the corresponding connecting through holes on the base one by one. And finally, taking out the positioning pins from the connecting through holes after the positioning is finished so as to finish the positioning of the rotary support.
In the embodiment of the disclosure, two positioning pins with different structures are utilized to control the slewing bearing to gradually approach the base, and in the process of gradually approaching the base, all the connection screw holes and the corresponding connection through holes are gradually positioned sequentially by the first positioning pin and the second positioning pin, that is, 3-point co-positioning is realized by single-point positioning and two-point adjustment, so that the connection screw holes of the inner ring and the connection through holes of the base can be quickly and accurately positioned, and the slewing bearing can be quickly assembled.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a positioning method of a slewing bearing according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a connection between a locating pin and a pivoting support provided by an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a first positioning pin provided in an embodiment of the present disclosure;
FIG. 4 is a schematic structural view of a second locating pin provided by an embodiment of the present disclosure;
FIG. 5 is a schematic view of a first positioning state of a slew bearing and pedestal provided by an embodiment of the present disclosure;
FIG. 6 is a schematic view of a second orientation of a slew bearing and pedestal provided by embodiments of the present disclosure;
FIG. 7 is a schematic view of a third positioning state of a slew bearing and pedestal provided by an embodiment of the present disclosure;
fig. 8 is a schematic diagram of a fourth positioning state of a slewing bearing and a base according to an embodiment of the disclosure.
The various symbols in the figure are illustrated as follows:
1-a first locating pin, 11-a first preliminary locating section, 111-a first guiding cone, 112-a first locating cylinder, 113-a clamping plane, 12-a first precise locating section, 121-a first guiding cone, 122-a first precise locating cylinder, 13-an external thread;
2-a second positioning pin, 21-a second preliminary positioning section, 211-a second guiding cone, 212-a second positioning cylinder, 22-a second precise positioning section, 221-a second semi-precise circular truncated cone, 222-a second semi-precise circular cylinder, 223-a second fully-precise circular truncated cone, 224-a second fully-precise circular cylinder;
3-inner ring, 31-connecting screw hole;
4-base, 41-connecting through hole.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," "third," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", "top", "bottom", and the like are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes.
Fig. 1 is a flowchart of a positioning method of a slewing bearing according to an embodiment of the present disclosure. As shown in fig. 1, the positioning method includes:
step 101: and installing the first end of the first positioning pin 1 and the first ends of the at least two second positioning pins 2 on the connecting screw hole 31 of the inner ring 3 of the slewing bearing.
Fig. 2 is a schematic view illustrating a connection between a positioning pin and a pivoting support according to an embodiment of the present disclosure. As shown in fig. 2, the first aligning pin 1 and the at least two second aligning pins 2 are arranged at intervals.
Fig. 3 is a schematic structural diagram of a first positioning pin according to an embodiment of the present disclosure. As shown in fig. 3, the first positioning pin 1 includes: consecutive first preliminary positioning section 11 and the first accurate positioning section 12 that is used for with the connect through-hole 41 transition fit of base 4, the diameter of first preliminary positioning section 11 is less than the diameter of first accurate positioning section 12.
Fig. 4 is a schematic structural diagram of a second positioning pin according to an embodiment of the present disclosure. As shown in fig. 4, the second positioning pin 2 includes a second preliminary positioning section 21 and a second precise positioning section 22 for transition fit with the connecting through hole 41 of the base 4, which are connected in sequence, and the diameter of the second preliminary positioning section 21 is smaller than that of the second precise positioning section 22.
Wherein, the length of first locating pin 1 and second locating pin 2 is the same, and the length of first preliminary location section 11 is less than the length of second preliminary location section 21.
Step 102: and controlling the inner ring 3 of the slewing bearing to be close to the base 4, and enabling the second end of the first positioning pin 1 and the second end of the second positioning pin 2 to be inserted into the corresponding connecting through holes 41 in the base 4.
Step 103: and controlling the inner ring 3 of the slewing bearing to move towards the base 4, so that the first accurate positioning section 12 of the first positioning pin 1 enters the corresponding connecting through hole 41 in the base 4, and preliminarily positioning the inner ring 3 of the slewing bearing.
Step 104: and continuously controlling the inner ring 3 of the slewing bearing to move towards the base 4, so that the second accurate positioning sections 22 of the at least two second positioning pins 2 enter the corresponding connecting through holes 41 in the base 4, and accurately positioning the inner ring 3 of the slewing bearing.
Step 105: and after the inner ring 3 of the slewing bearing is jointed with the base 4, the first positioning pin 1 and the second positioning pin 2 are taken down from the connecting through hole 41 of the base 4, and the positioning of the slewing bearing is completed.
The embodiment of the present disclosure provides a positioning method of a slewing bearing, which is to install a first positioning pin 1 and at least two second positioning pins 2 on an inner ring 3 of the slewing bearing, that is, install at least three positioning pins on a connection screw hole 31 of the inner ring 3. Then, the inner ring 3 of the slewing bearing is controlled to be close to the base 4, so that the slewing bearing drives the first positioning pin 1 and the second positioning pin 2 to move towards the base 4, and the first positioning pin 1 and the second positioning pin 2 are controlled to be inserted into the corresponding connecting through holes 41 in the base 4.
Since the length of the first preliminary positioning section 11 is smaller than that of the second preliminary positioning section 21, when the inner ring 3 of the slewing bearing is continuously controlled to be close to the base 4, the first precise positioning section 12 of the first positioning pin 1 preferentially enters the connecting through hole 41 of the base 4 compared with the second precise positioning section 22 of the second positioning pin 2. Since the first precise positioning section 12 is in transition fit with the connecting through hole 41 of the base 4, the connecting screw hole 31 of the first positioning pin 1 inserted on the slewing bearing and the connecting through hole 41 of the base 4 are precisely positioned, that is, the precise positioning of the single connecting screw hole 31 on the inner ring 3 is realized. And, in the process that first accurate positioning section 12 inserts the connect through-hole 41 of base 4, second locating pin 2 still is that second preliminary positioning section 21 is located the connect through-hole 41 of base 4, still remain great clearance between the connect through-hole 41 of second locating pin 2 and base 4 promptly, make first locating pin 1 can be on the plane that is on a parallel with inner circle 3 terminal surface and freely move in certain extent, so that first accurate positioning section 12 can insert the connect through-hole 41 of base 4 more easily, make the connect through-hole 41 transition fit of first locating pin 1 and base 4, realize the preliminary positioning of inner circle 3.
In the process of continuously controlling the inner ring 3 of the slewing bearing to approach the base 4, the first accurate positioning section 12 of the first positioning pin 1 is always in the connecting through hole 41 of the base 4, namely, at the moment, the first positioning pin 1 keeps one connecting screw hole 31 of the inner ring 3 and one connecting through hole 41 of the base 4 in an accurate butt joint state; because the second accurate positioning section 22 is in transition fit with the connecting through hole 41 of the base 4, after the second accurate positioning section 22 is inserted into the connecting through hole 41 of the base 4, the connecting screw hole 31 of the second positioning pin 2 and the connecting through hole 41 of the base 4 are also accurately positioned on the slewing bearing in an inserted manner, at least two second positioning pins 2 are provided, that is, the accurate positioning of at least three connecting screw holes 31 on the inner ring 3 is realized, and a plurality of positioning pins are arranged at intervals along the circumferential direction of the inner ring 3, that is, a three-point surface fixing manner is used to ensure that all the connecting screw holes 31 on the slewing bearing are concentric with the corresponding connecting through holes 41 on the base 4 one by one. Finally, the plurality of positioning pins are taken out from the connecting through holes 41 after the positioning is completed, so that the positioning of the slewing support is completed.
In the embodiment of the present disclosure, in the process of controlling the slewing bearing to gradually approach the base 4 by using two positioning pins with different structures, all the connection screw holes 31 and the corresponding connection through holes 41 are gradually positioned sequentially by the first positioning pin 1 and the second positioning pin 2, that is, 3-point co-positioning is realized by single-point positioning and two-point adjustment, so that the connection screw holes 31 of the inner ring 3 and the connection through holes 41 of the base 4 can be quickly and accurately positioned, and the slewing bearing can be quickly assembled.
Optionally, the first end of the first positioning pin 1 and the first end of the second positioning pin 2 are both provided with an external thread 13. Therefore, in step 101, the first ends of the first and second positioning pins 1 and 2 may be screwed on the coupling screw holes 31 of the inner race 3.
As shown in fig. 2, the end surface of the inner ring 3 is provided with a plurality of circumferentially arranged coupling screw holes 31, and the coupling screw holes 31 are used for fixedly coupling with the base 4.
In the embodiment of the present disclosure, there are one first positioning pin 1 and two second positioning pins 2. As shown in fig. 2, 3 positioning pins are respectively connected to 3 connection screw holes 31 which are not adjacent to each other on the end surface of the inner ring 3, and the first positioning pin 1 and the two second positioning pins 2 are arranged at intervals.
Exemplarily, 3 positioning pins may be evenly distributed circumferentially on the inner ring 3.
As shown in fig. 3, the first preliminary positioning section 11 includes a first guide cone 111 and a first positioning cylinder 112 connected, the first guide cone 111 is adjacent to the second end of the first positioning pin 1, and the large end of the first guide cone 111 is connected to the first positioning cylinder 112.
Wherein the outer wall surface of the first guide cone 111 is a conical surface, and the axial length L1 of the first guide cone 111 is not less than the length L of the connecting through hole 41 of the base 4. And the large end diameter of the first guide cone 111 is the same as the diameter D1 of the first positioning cylinder 112.
Wherein the conicity of the first guide cone 111 is 10 ° to 20 °. For example, the taper of the first guide cone 111 may be 15 ° so as to be more smoothly contacted with the outer wall surface of the first guide cone 111 and the inner wall surface of the coupling through-hole 41 of the base 4.
Illustratively, as shown in fig. 3, the axial length L12 of the first positioning cylinder 112 is not more than 0.5 times the length L of the connecting through hole 41 of the base 4, and the diameter D1 of the first positioning cylinder 112 is not more than (D0-2), wherein D0 is the diameter of the connecting through hole 41 of the base 4.
In the embodiment of the present disclosure, during the process of moving the pivoting support to the base 4, the position of the pivoting support is coarsely adjusted by a horizontal reaction force generated by the contact between the conical surface of the first guide cone 111 and the inner wall surface of the connecting through hole 41 of the base 4, so as to gradually correct the concentricity of the first positioning pin 1 and the connecting through hole 41 of the base 4. When the first positioning cylinder 112 enters the connecting through hole 41 of the base 4, the precise positioning of the single connecting screw hole 31 on the inner ring 3, that is, the primary positioning of the rotary support, is realized.
As shown in fig. 4, the second preliminary positioning section 21 includes a second guide cone 211 and a second positioning cylinder 212 connected, the second guide cone 211 being close to the second end of the second positioning pin 2, and the large end of the second guide cone 211 being connected to the second positioning cylinder 212.
Wherein the outer wall surface of the second guide cone 211 is a conical surface, and the axial length L1 of the second guide cone 211 is not less than the length L of the coupling through-hole 41 of the base 4. And the diameter of the large end of the second guide cone 211 is the same as the diameter D1 of the second positioning cylinder 212.
Wherein the conicity of the second guide cone 211 is 10 ° to 20 °. For example, the taper of the second guide cone 211 may be 15 ° so as to be more smoothly contacted with the outer wall surface of the second guide cone 211 and the inner wall surface of the coupling through-hole 41 of the base 4.
Illustratively, as shown in FIG. 4, the axial length L22 of the second positioning cylinder 212 is not less than the length L of the connecting through hole 41 of the base 4, and the diameter D1 of the second positioning cylinder 212 is not greater than (D0-2), wherein D0 is the diameter of the connecting through hole 41 of the base 4.
In the embodiment of the present disclosure, during the process of moving the pivoting support to the base 4, the position of the pivoting support is coarsely adjusted by a horizontal reaction force generated by the contact between the conical surface of the second guide cone 211 and the inner wall surface of the connecting through hole 41 of the base 4, so as to gradually correct the concentricity of the second positioning pin 2 and the connecting through hole 41 of the base 4. When the second positioning cylinder 212 enters the connecting through hole 41 of the base 4, the precise positioning of the single connecting screw hole 31 on the inner ring 3, that is, the primary positioning of the rotary support, is realized.
As shown in fig. 3 and 4, the axial length of the first guide cone 111 is the same as that of the second guide cone 211, so that after the first and second guide pins 1 and 2 enter the coupling through-holes 41 of the base 4, the first and second guide cones 111 and 211 simultaneously contact the coupling through-holes 41 of the base 4, the positions of the first and second guide pins 1 and 2 are simultaneously corrected, and the axial lengths of the first and second guide cones 111 and 211 are the same, so that the correction degrees of the first and second guide pins 1 and 2 are the same.
The length of the first positioning cylinder 112 is smaller than that of the second positioning cylinder 212, that is, in the process that the inner ring 3 gradually approaches the base 4, the first positioning cylinder 112 of the first positioning pin 1 enters the connecting through hole 41 of the base 4 before the second positioning cylinder 212 of the second positioning pin 2, so as to achieve the purpose of single-point positioning.
Fig. 5 is a schematic view of a first positioning state of a slewing bearing and a base according to an embodiment of the disclosure. As shown in fig. 5, step 102 may include the following two steps, and the two steps are simultaneously performed in controlling the inner race 3 toward the base 4:
in the first step, the first guide cone 111 is controlled to gradually enter the connecting through hole 41 of the base 4, and the concentricity of the first positioning pin 1 and the connecting through hole 41 of the base 4 is corrected by the outer wall surface of the first guide cone 111 and the inner wall surface of the connecting through hole 41 of the base 4 until the first positioning cylinder 112 enters the connecting through hole 41 of the base 4.
In the process that the first guide cone 111 gradually enters the connecting through hole 41 of the base 4, the conical surface of the first guide cone 111 contacts with the inner wall surface of the connecting through hole 41 of the base 4 to generate horizontal reaction force, and the position of the slewing bearing is roughly adjusted, so that the concentricity of the first positioning pin 1 and the connecting through hole 41 of the base 4 is gradually corrected.
In the second step, the second guide cone 211 is controlled to gradually enter the coupling through-hole 41 of the susceptor 4, and concentricity of the second positioning pin 2 and the coupling through-hole 41 of the susceptor 4 is corrected by the outer wall surface of the second guide cone 211 and the inner wall surface of the coupling through-hole 41 of the susceptor 4 until the second positioning cylinder 212 enters the coupling through-hole 41 of the susceptor 4.
In the process that the second guide cone 211 gradually enters the connecting through hole 41 of the base 4, the conical surface of the second guide cone 211 contacts with the inner wall surface of the connecting through hole 41 of the base 4 to generate horizontal reaction force, and the position of the pivoting support is roughly adjusted, so that the concentricity of the second positioning pin 2 and the connecting through hole 41 of the base 4 is gradually corrected.
Optionally, as shown in fig. 3, the first precise positioning section 12 includes a first guiding circular truncated cone 121 and a first precise positioning circular cylinder 122 for transition fit with the connecting through hole 41 of the base 4, a large end of the first guiding circular truncated cone 121 is connected with the first precise positioning circular cylinder 122, a small end of the first guiding circular truncated cone 121 is connected with the first positioning circular cylinder 112, and a diameter of the first precise positioning circular cylinder 122 is larger than a diameter of the first positioning circular cylinder 112.
The axial length L22 of the second positioning cylinder 212 is not less than the sum of the axial length L12 of the first positioning cylinder 112 and the axial length L13 of the first guiding cone 121, i.e. L22 > L12+ L13, so that the first precisely positioning section 12 of the first positioning pin 1 can preferentially enter the connecting through hole 41 of the base 4 to achieve the purpose of gradual positioning.
As shown in fig. 3, the outer wall surface of the first guiding cone 121 is a conical surface, the diameter of the small end of the first guiding cone 121 is the same as the diameter D1 of the first positioning cylinder 112, and the diameter of the large end of the first guiding cone 121 is the same as the diameter D3 of the first precise positioning cylinder 122.
Illustratively, the first precision positioning cylinder 122 has an axial length L13 of 5mm to 10 mm. For example, the axial length of the first precision positioning cylinder 122 may be 10 mm.
As shown in FIG. 3, the axial length L14 of the first precision positioning cylinder 122 is not less than 1.5 times the length L of the connecting through-hole 41 of the base 4, and the diameter D3 of the first precision positioning cylinder 122 is not greater than (D0-0.5). D0 is the diameter of the connecting through hole 41 of the base 4.
Wherein the axial length L14 of the first positioning cylinder 122 is not less than 1.5 times the length L of the connecting through hole 41 of the base 4, and the diameter D3 of the first positioning cylinder 122 is not more than (D0-0.5). D0 is the diameter of the connecting through hole 41 of the base 4.
Fig. 6 is a schematic diagram of a second positioning state of a slewing bearing and a base according to an embodiment of the disclosure. As shown in fig. 6, step 103 may include: and controlling the inner ring 3 of the slewing bearing to move towards the base 4, enabling the first guide circular truncated cone 121 to gradually enter the connecting through hole 41 of the base 4, and correcting the concentricity of the first positioning pin 1 and the connecting through hole 41 of the base 4 to a set tolerance through the outer wall surface of the first guide circular truncated cone 121 and the inner wall surface of the connecting through hole 41 of the base 4 until the first accurate positioning cylinder 122 enters the connecting through hole 41 of the base 4.
In step 103, the slewing bearing is slowly approached to the butt joint surface of the base 4, the position of the slewing bearing is adjusted by a horizontal reaction force generated by the contact between the conical surface of the first guiding circular truncated cone 121 and the inner wall surface of the connecting through hole 41 of the base 4, so as to gradually correct the concentricity of the first positioning pin 1 and the connecting through hole 41 of the base 4, and the first accurate positioning cylinder 122 is slowly inserted into the connecting through hole 41 of the base 4, so as to perform single-point positioning on the slewing bearing, i.e. to realize initial positioning.
Wherein the diameter D3 of the first precise positioning cylinder 122 may be equal to (D0-0.5), D0 being the diameter of the connecting through hole 41 of the base 4. I.e. the set tolerance may be 0.5 mm.
Optionally, as shown in fig. 4, the second precise positioning section 22 includes a second semi-precise circular truncated cone 221, a second semi-precise cylinder 222, a second full-precise circular truncated cone 223, and a second full-precise cylinder 224 for transition fitting with the connecting through hole 41 of the base 4, the second positioning cylinder 212 is connected to the small end of the second semi-precise circular truncated cone 221, the large end of the second semi-precise circular truncated cone 221 is connected to one end of the second semi-precise cylinder 222, the other end of the second semi-precise cylinder 222 is connected to the small end of the second full-precise circular truncated cone 223, and the large end of the second full-precise circular truncated cone 223 is connected to the second full-precise cylinder 224.
As shown in FIG. 4, the diameter of the second semi-fine cylinder 222 is greater than the diameter of the second positioning cylinder 212 and the diameter of the second fully-fine cylinder 224 is greater than the diameter of the second semi-fine cylinder 222.
As shown in fig. 4, the outer wall surface of the second semi-fine circular truncated cone 221 is a conical surface, the diameter of the small end of the second semi-fine circular truncated cone 221 is the same as the diameter D1 of the second positioning cylinder 212, and the diameter of the large end of the second semi-fine circular truncated cone 221 is the same as the diameter D2 of the second semi-fine circular cylinder 222.
Illustratively, the axial length L23 of the second semi-precision truncated cone 221 is 3mm to 5 mm. For example, the axial length L23 of the second semi-frustoconical body 221 may be 5 mm.
As shown in FIG. 4, the axial length of the second semi-fine cylinder 222 is not less than 0.5 times the length L of the connecting through-hole 41 of the base 4, and the diameter D2 of the second semi-fine cylinder 222 is not greater than (D0-1.0). Where D0 is the diameter of the connecting through hole 41 of the base 4.
Here, the axial length L24 of the second semi-fine cylinder 222 may be 0.5 times the length L of the connection through hole 41 of the base 4, that is, L24 is 0.5L.
As shown in fig. 4, the outer wall surface of the second fully-rounded frustum 223 is a conical surface, the diameter of the small end of the second fully-rounded frustum 223 is the same as the diameter D2 of the second semi-perfect cylinder 222, and the diameter of the large end of the second fully-rounded frustum 223 is the same as the diameter D3 of the second fully-rounded cylinder 224.
Illustratively, the axial length L25 of the second fully rounded frustum 223 is 3mm to 5 mm. For example, the axial length L25 of the second fully rounded frustum 223 may be 5 mm.
As shown in FIG. 4, the axial length L26 of the second fully fine cylinder 224 is not less than 0.5 times the length L of the connecting through hole 41 of the base 4, and the diameter D3 of the second fully fine cylinder 224 is not greater than (D0-0.5). Where D0 is the diameter of the connecting through hole 41 of the base 4.
Here, the axial length L26 of the second fully-refined cylinder 224 may be 0.5 times the length L of the connection through hole 41 of the base 4, that is, L26 is 0.5L.
In the disclosed embodiment, the tolerances of the diameter D1 of the first positioning cylinder 112, the diameter D3 of the first precision positioning cylinder 122, the diameter D1 of the second positioning cylinder 212, the diameter D2 of the second semi-precision cylinder 222, and the diameter D3 of the second fully-precision cylinder 224 are all 0.1 mm.
Fig. 7 is a schematic diagram of a third positioning state of a slewing bearing and a base provided in an embodiment of the disclosure, and fig. 8 is a schematic diagram of a fourth positioning state of a slewing bearing and a base provided in an embodiment of the disclosure. As shown in fig. 7 and 8, step 104 may include the following two steps performed in sequence:
in the first step, the inner ring 3 of the slewing bearing is controlled to move towards the base 4, so that the second semi-fine circular truncated cone 221 gradually enters the connecting through hole 41 of the base 4, and the concentricity of the second positioning pin 2 and the connecting through hole 41 of the base 4 is corrected to an initial tolerance through the outer wall surface of the second semi-fine circular truncated cone 221 and the inner wall surface of the connecting through hole 41 of the base 4 until the second semi-fine circular cylinder 222 enters the connecting through hole 41 of the base 4.
In the first step, as shown in fig. 7, the slewing bearing is slowly approached to the butt-joint surface of the base 4, the position of the slewing bearing is semi-finely adjusted by the horizontal reaction force generated by the contact between the conical surface of the second semi-fine circular truncated cone 221 and the inner wall surface of the connecting through hole 41 of the base 4, so that the second semi-fine circular truncated cones 221 of the 2 second positioning pins 2 respectively and simultaneously slowly and vertically enter the 2 corresponding connecting through holes 41 on the base 4, and the semi-fine positioning of the slewing bearing on the base 4 is realized.
Wherein, the diameter D2 of the second semi-fine cylinder 222 is (D0-1.0), and D0 is the diameter of the connecting through hole 41 of the base 4. I.e. the initial tolerance may be 0.5 mm.
And secondly, continuously controlling the inner ring 3 of the slewing bearing to move towards the base 4, enabling the second full-precision circular truncated cone 223 to gradually enter the connecting through hole 41 of the base 4, and correcting the concentricity of the second positioning pin 2 and the connecting through hole 41 of the base 4 to a set tolerance through the outer wall surface of the second full-precision circular truncated cone 223 and the inner wall surface of the connecting through hole 41 of the base 4 until the second full-precision circular cylinder 224 enters the connecting through hole 41 of the base 4.
In the first step, as shown in fig. 8, the slewing bearing is further vertically and slowly dropped to be close to the butt-joint surface of the base 4, and the position of the slewing bearing is precisely finely adjusted by the horizontal reaction force generated by the contact between the conical surface of the second fully-rounded frustum 223 and the inner wall surface of the connecting through hole 41 of the base 4, so that the second fully-rounded frustum 223 of the 2 second positioning pins 2 respectively and slowly enter the connecting through hole 41 of the base 4 at the same time. Meanwhile, the 2 second positioning pins 2 are combined with the first accurate positioning cylinder 122 of the first positioning pin 1 to accurately position the slewing bearing in a 3-point surface-to-surface mode, so that the slewing bearing and the base 4 are accurately butted and positioned.
Wherein, the diameter D3 of the second fully-refined cylinder 224 is (D0-0.5), and D0 is the diameter of the connecting through hole 41 of the base 4. I.e. the set tolerance may be 0.5 mm.
And 104, performing semi-fine positioning on the base 4 and the slewing bearing through the two second positioning pins 2, and then performing full-fine positioning, namely ensuring the accuracy of 3-point surface positioning in a mode of gradually improving the positioning accuracy.
As shown in fig. 3 and 4, the outer wall surface of the first preliminary positioning section 11 and the outer wall surface of the second preliminary positioning section 21 are provided with holding planes 113. For example, the outer wall surfaces of the first preliminary positioning section 11 and the second preliminary positioning section 21 may be provided with two clamping planes 113, and the two clamping planes 113 on the first preliminary positioning section 11 are symmetrically distributed with respect to the axis of the first preliminary positioning section 11, and the two clamping planes 113 on the second preliminary positioning section 21 are symmetrically distributed with respect to the axis of the second preliminary positioning section 21, so that the clamp can firmly clamp the first positioning pin 1 and the second positioning pin 2, so as to unscrew the first positioning pin 1 and the second positioning pin 2 from the connecting screw hole 31.
Step 105 of the embodiment of the present disclosure may include clamping the clamping plane 113 of the first positioning pin 1 and the clamping plane 113 of the second positioning pin 2 by using a clamp, screwing the first positioning pin 1 and the second positioning pin 2, and taking down the first positioning pin 1 and the second positioning pin 2 from the connection screw hole 31 of the inner ring 3 to complete the positioning of the slewing bearing.
Although the present disclosure has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure.
Claims (10)
1. A method of positioning a slewing bearing, the method comprising:
the first end of the first positioning pin and the first ends of the at least two second positioning pins are both arranged on the connecting screw hole of the inner ring of the slewing bearing, the first positioning pin and the at least two second positioning pins are arranged at intervals, the first positioning pin comprises a first preliminary positioning section and a first precise positioning section which are sequentially connected, the first precise positioning section is used for being in transition fit with the connecting through hole of the base, the diameter of the first preliminary positioning section is smaller than that of the first accurate positioning section, the second positioning pin comprises a second preliminary positioning section and a second accurate positioning section which are sequentially connected, the second accurate positioning section is used for being in transition fit with the connecting through hole of the base, the diameter of the second preliminary positioning section is smaller than that of the second precise positioning section, the lengths of the first positioning pin and the second positioning pin are the same, and the length of the first preliminary positioning section is smaller than that of the second preliminary positioning section;
controlling the inner ring of the slewing bearing to be close to the base, and enabling the second end of the first positioning pin and the second end of the second positioning pin to be inserted into the corresponding connecting through holes in the base;
controlling the inner ring of the slewing bearing to move towards the base, so that the first accurate positioning section of the first positioning pin enters the corresponding connecting through hole in the base, and preliminarily positioning the inner ring of the slewing bearing;
continuously controlling the inner ring of the slewing bearing to move towards the base, so that the second accurate positioning sections of the at least two second positioning pins enter the corresponding connecting through holes in the base, and accurately positioning the inner ring of the slewing bearing;
and after the inner ring of the slewing bearing is jointed with the base, the first positioning pin and the second positioning pin are taken down from the connecting through hole of the base, and the positioning of the slewing bearing is completed.
2. The positioning method according to claim 1, wherein the first preliminary positioning section comprises a first guide cone and a first positioning cylinder connected, the first guide cone being adjacent to the second end of the first positioning pin, the large end of the first guide cone being connected to the first positioning cylinder,
the second preliminary positioning section comprises a second guide cone and a second positioning cylinder which are connected, the second guide cone is close to the second end of the second positioning pin, the large end of the second guide cone is connected with the second positioning cylinder,
the length of the first guide cone is the same as that of the second guide cone, and the length of the first positioning cylinder is smaller than that of the second positioning cylinder.
3. The positioning method according to claim 2, wherein the step of bringing the inner ring of the control slewing bearing close to the base so that the second ends of the first positioning pin and the second positioning pin are inserted into the corresponding connecting through holes in the base comprises the steps of:
controlling the first guiding cone to gradually enter the connecting through hole of the base, and correcting the concentricity of the first positioning pin and the connecting through hole of the base through the outer wall surface of the first guiding cone and the inner wall surface of the connecting through hole of the base until the first positioning cylinder enters the connecting through hole of the base;
and controlling the second guide cone to gradually enter the connecting through hole of the base, and correcting the concentricity of the second positioning pin and the connecting through hole of the base through the outer wall surface of the second guide cone and the inner wall surface of the connecting through hole of the base until the second positioning cylinder enters the connecting through hole of the base.
4. The positioning method according to claim 2, wherein the first precise positioning section comprises a first guiding circular truncated cone and a first precise positioning cylinder for transition fit with the connecting through hole of the base, the large end of the first guiding circular truncated cone is connected with the first precise positioning cylinder, the small end of the first guiding circular truncated cone is connected with the first positioning cylinder, and the diameter of the first precise positioning cylinder is larger than that of the first positioning cylinder.
5. The positioning method according to claim 4, wherein the step of controlling the inner ring of the slewing bearing to move towards the base so that the first precise positioning section of the first positioning pin enters the corresponding connecting through hole in the base to preliminarily position the inner ring of the slewing bearing comprises the following steps:
and controlling the inner ring of the slewing bearing to move towards the base, enabling the first guide circular truncated cone body to gradually enter the connecting through hole of the base, and correcting the concentricity of the first positioning pin and the connecting through hole of the base to a set tolerance through the outer wall surface of the first guide circular truncated cone body and the inner wall surface of the connecting through hole of the base until the first accurate positioning cylinder enters the connecting through hole of the base.
6. The positioning method according to claim 2, wherein the second precise positioning section comprises a second semi-precise circular truncated cone, a second semi-precise cylinder, a second full-precise circular truncated cone and a second full-precise cylinder for transitionally matching with the connecting through hole of the base, the second positioning cylinder is connected with the small end of the second semi-precise circular truncated cone, the large end of the second semi-precise circular truncated cone is connected with one end of the second semi-precise cylinder, the other end of the second semi-precise cylinder is connected with the small end of the second full-precise circular truncated cone, the large end of the second full-precise circular truncated cone is connected with the second full-precise cylinder,
the diameter of the second semi-fine cylinder is larger than that of the second positioning cylinder, and the diameter of the second full-fine cylinder is larger than that of the second semi-fine cylinder.
7. The positioning method according to claim 6, wherein the step of continuously controlling the inner ring of the slewing bearing to move towards the base so that the second accurate positioning sections of at least two of the second positioning pins enter the corresponding connecting through holes in the base to accurately position the inner ring of the slewing bearing comprises the following steps:
controlling the inner ring of the slewing bearing to move towards the base, enabling the second semi-fine circular truncated cone body to gradually enter the connecting through hole of the base, and correcting the concentricity of the second positioning pin and the connecting through hole of the base to an initial tolerance through the outer wall surface of the second semi-fine circular truncated cone body and the inner wall surface of the connecting through hole of the base until the second semi-fine circular cylinder body enters the connecting through hole of the base;
and continuously controlling the inner ring of the slewing bearing to move towards the base, enabling the second full-precision circular truncated cone body to gradually enter the connecting through hole of the base, and correcting the concentricity of the second positioning pin and the connecting through hole of the base to a set tolerance through the outer wall surface of the second full-precision circular truncated cone body and the inner wall surface of the connecting through hole of the base until the second full-precision circular truncated cone body enters the connecting through hole of the base.
8. The positioning method according to claim 7, wherein the initial tolerance is 1mm and the set tolerance is 0.5 mm.
9. The positioning method according to any one of claims 1 to 8, wherein the outer wall surface of the first preliminary positioning section and the outer wall surface of the second preliminary positioning section are each provided with a clamping plane.
10. The method of any of claims 1 to 8, wherein the first end of the first dowel pin and the first end of the second dowel pin are each externally threaded.
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| CN202110032837.4A CN112922941B (en) | 2021-01-11 | 2021-01-11 | Positioning method of slewing bearing |
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| CN202110032837.4A CN112922941B (en) | 2021-01-11 | 2021-01-11 | Positioning method of slewing bearing |
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| GB1202190A (en) * | 1969-06-17 | 1970-08-12 | Roller Bearing Co Of America | An eccentrically adjustable roller |
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| GB1202190A (en) * | 1969-06-17 | 1970-08-12 | Roller Bearing Co Of America | An eccentrically adjustable roller |
| CN109366128A (en) * | 2018-11-28 | 2019-02-22 | 苏州新智机电科技有限公司 | A kind of feeding charging tray angularly positioned for part |
| CN110370014A (en) * | 2019-07-16 | 2019-10-25 | 徐州徐工矿业机械有限公司 | A kind of large excavator pivoting support guiding assembly method |
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