US3626493A - Gripper-type linear motion device - Google Patents

Gripper-type linear motion device Download PDF

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Publication number
US3626493A
US3626493A US834465A US3626493DA US3626493A US 3626493 A US3626493 A US 3626493A US 834465 A US834465 A US 834465A US 3626493D A US3626493D A US 3626493DA US 3626493 A US3626493 A US 3626493A
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US
United States
Prior art keywords
slug
latching
coil
shaft
lifting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US834465A
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English (en)
Inventor
Peter F Behmke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Combustion Engineering Inc
Original Assignee
Combustion Engineering Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Combustion Engineering Inc filed Critical Combustion Engineering Inc
Application granted granted Critical
Publication of US3626493A publication Critical patent/US3626493A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
    • H02K7/065—Electromechanical oscillators; Vibrating magnetic drives
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C7/00—Control of nuclear reaction
    • G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
    • G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
    • G21C7/12—Means for moving control elements to desired position
    • G21C7/14—Mechanical drive arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • a lower coil operates to pull down a lower slug while a lower central coil operates to effect engagement between the lower slug and the shaft.
  • the single central coil operates to simultaneously pull down the upper slug and lift the lower slug whereby two lifting steps are accomplished in each cycle of the lifting device.
  • This invention relates to linear motion devices and in particular to the type which are hermetically sealed and operated by magnetic coils which move slugs to effect lifting and also move grippers into and out of engagement with the shaft.
  • Linear motion devices of the type contemplated operate by using a magnetic field to move a slug a predetermined distance.
  • a separated magnetic field is regulated to engage and disengage grippers so that the lifting slug may be moved back and forth alternately disengaging and engaging the gripper to effect a stepping motion of the shaft.
  • Separate latching means have been supplied to latch the shaft and hold it in place between steps of the lifting coil.
  • FIGURE illustrates a sectional side elevation of the linear motion device.
  • DESCRIPTION OF THE PREFERRED EMBODIMENT Shaft 12 extends vertically through the linear motion device.
  • This shaft which is to be moved axially and positioned has thereon a number of axially spaced projections 13 with these projections being spaced one-half inch apart.
  • Tubular housing 14 is constructed of a magnetic material such as ferritic steel and is designed to withhold substantial pressure in the order of 2,000 p.s.i.
  • This housing has five coils concentrically surrounding it at different elevations. These coils are operated to lift, lower, latch, and unlatch the shaft as will be described below.
  • Fixed sleeve 15 is mounted inside the tubular housing and securely attached thereto so that there is no vertical movement between the sleeve and the housing.
  • This sleeve includes a lower stop 17, a central stop 18, an an upper stop 19.
  • a lower slug 22 includes an upper stop 23 and a lower stop 24. This slug surrounds the sleeve near the lower end and is retained in the space between the sleeve and the tubular housing. Buffer springs 25 are located at the upper and lower ends of the lower slug to absorb impact when the slug meets the stationary member.
  • the spacing between the lower slug 22 and stops l7 and 18 of the sleeve is such as to leave a one-half inch free travel with full spring compression which matches the spacing between the projections on shaft 12.
  • Nonmagnetic inserts 27 are located in the housing just below each of the surrounding magnetic coils. These inserts force the magnetic field to flow in through the shaft and axially slide slugs located within the housing.
  • Coil E when energized creates a magnetic field passing through stops 24 and 17 which causes the lower slug 22 .to be drawn downwardly against stop 17.
  • coil C operates to cause stops 23 and 18 to be brought together raising lower slug 22 against stop 18 of sleeve 15.
  • upper slug 32 has an upper stop 33 and lower stop 34.
  • Shock absorbing washers 35 are located at the upper and lower ends to absorb impact on movement of the upper slug.
  • the clearance between the upper slug 32 and stops l8 and 19 of the sleeve is such that one-half inch free travel is permitted with full compression of the springs.
  • Energizing coil A operates to close the upper gap raising upper slug 32 against stop 19 while energizing coil C operates to pull down upper slug 32 against stop 18.
  • Coil D operates to engage lower latch 42.
  • This latch is pivotally connected to the lower slug 22 and also pivotally connected to a lower latching slug 43.
  • the lower latching member 42 is forced inwardly into engagement with projections 13 on the shaft.
  • An opening 44 is provided in the sleeve so that the latching member may pass therethrough.
  • Energizing coil D operates to close the gap between upper stop 23 of lower slug 22 and the coil latching slug 43. Since this moves slug 43 upwardly relative to lower slug 22, it effects engagement of the latch 42.
  • Coil spring 45 operates to press the slug 43 downwardly away from upper stop 23 so as to effect disengagement when coil D is deenergized.
  • an upper latch 52 is pivotally connected to upper slug 32 and to upper latching slug 53. Operation of coil B closes the gap between the upper latching slug 53 and upper stop 33 to effect engagement of upper latch 52.
  • Coil spring 54 operates to force the latch out of engagement when coil B is deenergized.
  • Rapid movement of shaft 12 is effected by sequentially energizing selected coils.
  • the position of the elements is assumed initially as shown in the illustration with coils A, B, and E being energized.
  • Coil A maintains the upper slug 32 against upper stop 19
  • coil B effects latching between the upper slug and the shaft
  • coil E holds the lower slug 22 in the downward position.
  • Coil B is then turned off. This effects disengagement of upper latch 52 so that the entire weight of the shaft is now carried on lower latch 42.
  • Coils A and E are next turned off while coil C is turned on.
  • Deenergizing coil A releases the upper slug from upper stop 19 while deenergizing coil E releases the lower slug from lower stop 17.
  • Energizing coil C draws the upper slug 32 downwardly while simultaneously lifting lower slug 22 together with shaft which is at this time latched to the lower slug.
  • Coil B is then energized which causes upper latch 52 to engage the projections of the shaft.
  • Coil D is then deenergized which releases lower latch 42 so that the weight of the shaft is now carried on the upper latch 5
  • Coil C is then deenergized while coils A and E are energized. Deenergizing coil C releases both the upper and lower slugs from central stop 18. Energizing coil E draws the lower slug 22 downwardly. Energizing coil A raises the upper slug 32 along with the shaft which is latched thereto.
  • Lowering of the shaft may be accomplished as follows. In a position as illustrated in the drawing, coil A, B, and E are energized with the shaft held by the upper latch and having the upper slug held upwardly against upper stop 19. At the same time coil E has lower slug 22 drawn down.
  • Coils A and E are deenergized while coil C is energized. Deenergizing coils A and E release the upper and lower slugs from stops l9 and 17, respectively. Energizing coil C draws both of these slugs against the central stop 18. The shaft 12 which is latched to the upper slug is moved downwardly onehalf inch.
  • Coil D is then energized which causes lower latch 42 to move into engagement with the shaft.
  • Coil B is deenergized thereby releasing upper latch 52 so that the entire weight of the shaft is carried on the lower latch 42.
  • Coil C is then deenergized while coils A and E are energized.
  • the deenergizing coil C releases both slugs from central stop 18.
  • Energizing coil A draws the upper slug against upper stop 19 while energizing coil E draws the lower slug down against lower stop 17.
  • the shaft being latched to the lower slug is moved downwardly one-half inch during this step.
  • Coil B is then energized which causes upper latch 52 to engage the shaft.
  • Coil D is then deenergized which causes lower latch 42 to move out of engagement with the shaft so that the weight of the shaft is carried on the upper latch 52. At this point a cycle has been completed and further lowering of the shaft is accomplished by again repeating the cycle.
  • An apparatus for linearly moving a shaft having a plurality of axially spaced projections thereon comprising: an upper slug surrounding said shaft and moving a limited distance axially; a lower slug surrounding said shaft and moving a limited distance axially; an upper latching slug moving axially with said upper slug and also relative to said upper slug; a lower latching slug moving axially with said lower slug and also relative to said lower slug; an upper latching means pivotally connected to said upper slug and said upper latching slug so that the latching means moves inwardly and latches to said shaft when said upper slug and upper latching slug are moved together; a lower latching means pivotally connected to said lower slug and said lower latching slug so that the latching means moves inwardly and latches to said shaft when said lower slug and lower latching slug are moved together; means for drawing said upper latching slug and said upper slug together to efiec
  • said means for drawing said upper latching slug and said upper slug together comprises a first coil for establishing a magnetic field in the area of said upper latching slug and said upper slug; said means for drawing said lower latching slug and said lower slug together comprises a second coil for establishing a magnetic field in the area of said lower latching slug and said lower slug; said means lifting said upper slug comprising a third coil for establishing a magnetic field in the area of said upper slug; said means for pulling said lower slug down comprising a fourth coil for establishing a magnetic field in the area of said lower slug; and
  • said means for simultaneously lifting said lower slug and pulling down said upper slug comprising a fifth COll for establishing a magnetic field in the area of said lower slug.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
  • Manipulator (AREA)
  • Linear Motors (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US834465A 1969-06-18 1969-06-18 Gripper-type linear motion device Expired - Lifetime US3626493A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US83446569A 1969-06-18 1969-06-18

Publications (1)

Publication Number Publication Date
US3626493A true US3626493A (en) 1971-12-07

Family

ID=25267009

Family Applications (1)

Application Number Title Priority Date Filing Date
US834465A Expired - Lifetime US3626493A (en) 1969-06-18 1969-06-18 Gripper-type linear motion device

Country Status (6)

Country Link
US (1) US3626493A (2)
JP (1) JPS4844968B1 (2)
DE (1) DE2021856A1 (2)
ES (1) ES380863A1 (2)
GB (1) GB1275517A (2)
SE (1) SE359953B (2)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765585A (en) * 1971-12-23 1973-10-16 Combustion Eng Control arrangement for self-closing control rod latches
US4125432A (en) * 1977-01-24 1978-11-14 Combustion Engineering, Inc. Drive mechanism nuclear reactor control rod
US20160141945A1 (en) * 2014-11-13 2016-05-19 Kepco Engineering & Construction Company, Inc. Magnetic jack type control element drive mechanism for precision position control of control element assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50119987U (2) * 1974-03-15 1975-09-30
JPS5174795U (2) * 1974-12-06 1976-06-11
JPS5359693U (2) * 1976-10-25 1978-05-20

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2126453A (en) * 1936-09-14 1938-08-09 William W Criley Apparatus for forming blanks from hot rolled wire stock
US2639494A (en) * 1948-03-16 1953-05-26 Warner Swasey Co Machine tool
US2695096A (en) * 1950-06-07 1954-11-23 New Britain Machine Co Bar feed means
US3211944A (en) * 1962-05-03 1965-10-12 Westinghouse Electric Corp Arc welding apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2126453A (en) * 1936-09-14 1938-08-09 William W Criley Apparatus for forming blanks from hot rolled wire stock
US2639494A (en) * 1948-03-16 1953-05-26 Warner Swasey Co Machine tool
US2695096A (en) * 1950-06-07 1954-11-23 New Britain Machine Co Bar feed means
US3211944A (en) * 1962-05-03 1965-10-12 Westinghouse Electric Corp Arc welding apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765585A (en) * 1971-12-23 1973-10-16 Combustion Eng Control arrangement for self-closing control rod latches
US4125432A (en) * 1977-01-24 1978-11-14 Combustion Engineering, Inc. Drive mechanism nuclear reactor control rod
US20160141945A1 (en) * 2014-11-13 2016-05-19 Kepco Engineering & Construction Company, Inc. Magnetic jack type control element drive mechanism for precision position control of control element assembly
US9711245B2 (en) * 2014-11-13 2017-07-18 Kepco Engineering & Construction Company, Inc. Magnetic jack type control element drive mechanism for precision position control of control element assembly

Also Published As

Publication number Publication date
DE2021856A1 (de) 1970-12-23
JPS4844968B1 (2) 1973-12-27
ES380863A1 (es) 1972-09-16
GB1275517A (en) 1972-05-24
SE359953B (2) 1973-09-10

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