JP5971778B1 - Shelf positioning mechanism and cryogenic storage system - Google Patents

Abstract

To provide a shelf positioning mechanism that has a simple drive transmission system, operates reliably in a low-temperature warehouse without using special detection devices and drive devices, has few heat conduction paths, and reduces cooling costs. A shelf positioning mechanism 102 for a plurality of movable shelves 130 arranged in the Z direction, corresponding to each of a plurality of movable shelves 130 and an operating shaft 110 disposed on a side of the plurality of movable shelves 130. And a plurality of lock units 120 for positioning the movable shelf 130 provided on the side, and the plurality of lock units 120 can be independently rotated and moved in the Z direction according to the rotational position of the operating shaft 110. What is being done. [Selection] Figure 3

Description

  The present invention relates to a shelf positioning mechanism that determines the position of a moving shelf inside a low temperature hangar or the like, and a storage system that stores a storage object at a low temperature using the shelf positioning mechanism, and in particular, discovers a drug in medicine, biotechnology, and pharmacy. The present invention relates to a shelf positioning mechanism and a cryogenic storage system for storing a drug discovery sample used in a process of designing and designing at a low temperature.

  Conventionally, as a storage system for storing a container containing a sample, for example, when storing at low temperature, a cartridge that stores a plurality of storage plates that hold a plurality of containers in a vertical direction, and a low-temperature storage that stores a plurality of cartridges (low temperature Storage room), a work space that is cooler than the external environment provided adjacent to the cold storage, a storage room provided adjacent to the work space, and a storage plate provided in the work space. 2. Description of the Related Art A storage system is known that includes a plate transport mechanism that moves in and out of a storage rack and a picking mechanism that is provided in a work space and can individually take out containers from the storage plate (see, for example, Patent Document 1).

In the storage system known in Patent Document 1 or the like, when a desired container is taken out from the low temperature storage, it is necessary to lift the storage rack to the upper working space and take out the storage plate from the storage rack. Since the storage plate is held in a multi-stage with a long direction, it takes time to pick a desired container and there is a problem that work efficiency is low.
In addition, by using storage racks and storage plates, the space efficiency in the low temperature storage is low, and storage plates other than the desired storage plates are once lifted from the low temperature storage. There was a problem of becoming higher.

  Therefore, it has a low temperature hangar (storage room) and a plurality of movable shelves (shelves) arranged vertically in the low temperature hangar in a state that they can rotate independently of each other about a vertical axis, At least some of the movable shelves are provided with storage areas for storing the objects to be stored, each moving shelf is provided with a slit that penetrates in the vertical direction, and the shelf driving means is a shelf drive that is movable in the vertical direction. It has a member (raising arm) and is configured to rotate the moving shelf by applying force to the moving shelf, and by taking out only the tray held on the desired shelf, the work efficiency is improved, A low-temperature storage system that prevents deterioration in quality of a storage target and reduces costs associated with a coolant is known (see, for example, Patent Document 2).

JP 2012-56730 A JP-T 6-509782 Publication

However, in the low-temperature storage system known in Patent Document 2 and the like, when a desired tray is loaded into and unloaded from a desired shelf position, the slit position of each movable shelf and the position of the shelf holding the desired tray are accurately determined. Must be.
For this purpose, it is desirable to control various sensors, motors, actuators, and other detection devices and drive devices in the low-temperature storage. For example, the inside of the low-temperature storage is −190 ° C. with a coolant such as liquid nitrogen. When the temperature is set to an ultra-low temperature, etc., there is a problem that it is necessary to employ very expensive and special detection devices and driving devices that operate reliably even at extremely low temperatures without failure.

In addition, it is also possible to control the slit position of the moving shelf and the position of the shelf holding the desired tray only by the control operation of the shelf driving member without arranging the detection device and the driving device in the low temperature storage. It is difficult to accurately position the movable shelf due to errors in the drive transmission system, vibration or inertial movement, etc. There was a problem that caused trouble.
Even when only some positioning mechanism is arranged inside, each moving shelf can move independently, and in order to position and release each individually, a plurality of independent sensors, motors, actuators, etc. are required, Even if those drive units and control units can be arranged outside, a complicated mechanism is required for the drive transmission system that transmits the operation to the inside, and the heat conduction path increases, and the cost of the coolant is increased. There was a problem of increasing.

  The present invention solves these problems, and the drive transmission system is simple and operates reliably in a low-temperature chamber without using special detection equipment or drive equipment, and has a small heat conduction path and cooling cost. It is an object of the present invention to provide a shelf positioning mechanism that reduces the amount of heat and a low-temperature storage system that can efficiently store a large amount of storage objects and that can shorten the work time.

The shelf positioning mechanism according to the present invention is a shelf positioning mechanism for a plurality of moving shelves arranged in the Z direction orthogonal to the predetermined surface in a state that the shelf positioning mechanism can move within a predetermined surface independently of each other, and the plurality of movements An operating shaft disposed on a side of the shelf, and a plurality of lock units provided on the side corresponding to the plurality of moving shelves for positioning the moving shelf, wherein the operating shaft rotates and Z The plurality of lock units are provided independently to rotate and move in the Z direction according to the rotational position of the operating shaft, and the lock unit includes a cylindrical unit body; It has an engagement pin protruding inside the unit main body and a stopper pin protruding outside the unit main body, and the plurality of movable shelves can be engaged with the stopper pins and used for positioning the movable shelf. A plurality of engagement blocks is provided that, only the stopper pin of the desired of the lock unit, configured to perform positioning by engaging the engaging block is rotated by rotation of the actuating shaft Therefore, the above-described problem is solved.
The low-temperature storage system according to the present invention is a low-temperature storage system for storing an object to be stored at a low temperature, and is arranged above and below in the low-temperature hangar in a state of being rotatable independently of each other around the vertical axis. By providing the plurality of movable shelves, shelf driving means for rotating the movable shelves, and the above-described shelf positioning mechanism, the above-described problem is solved.

According to the shelf positioning mechanism according to claim 1 and the low-temperature storage system according to claim 5, the shelf positioning mechanism includes an operation shaft disposed on a side of the plurality of movable shelves and a side corresponding to each of the plurality of movable shelves. And a plurality of lock units for positioning the movable shelf, the operating shaft is provided so as to be able to rotate and move in the Z direction, and the plurality of lock units are individually independent according to the rotational position of the operating shaft. The lock unit has a cylindrical unit body, an engagement pin that protrudes to the inside of the unit body, and a stopper pin that protrudes to the outside of the unit body. Is provided with a plurality of engagement blocks that can be engaged with a stopper pin and used for positioning the movable shelf, and only the stopper pin of a desired lock unit is rotated by the rotation of the operating shaft. Lock Te by being configured to perform positioning by engaging the engagement block, motor movable shelf near, without arranging a device such as an actuator, a plurality only operation of one operating shaft The operation of the unit can be performed individually, the transmission path of the operation is simple, it can operate reliably even in a low-temperature chamber, the heat conduction path is few, and the cooling cost can be reduced.

According to the configuration of the second aspect , the operating shaft is provided so as to penetrate the cylindrical unit main body, and has a plurality of operating gear portions at positions corresponding to the cylindrical unit main body. The gear portion has at least one passage groove portion through which the engagement pin passes in the Z direction and an engagement groove portion with which the engagement pin engages, and the engagement groove portions are located at different circumferential positions in the plurality of operation gear portions. It is not necessary to provide a movable part that performs operations other than rotation and Z-direction movement of the operating shaft and the plurality of lock units, and the transmission path of the operation is further simplified and more reliably even in a low-temperature chamber. It becomes possible to operate.
According to the configuration described in claim 3, the operating gear portion further includes a common engaging groove portion with which the engaging pin engages, and the common engaging groove portion has the same circumference in at least two operating gear portions. By arranging in the directional position, it is possible to individually position and release a plurality of movable shelves, and simultaneously position and release two or more movable shelves as necessary during maintenance work, etc. It is also possible.

According to the configuration of the fourth aspect, the unit stopper is provided on the side of the plurality of lock units, and the release shaft for releasing the unit stopper corresponding to the plurality of lock units is provided on the operating shaft. The plurality of release pins are positions where the unit stoppers can be released when the engagement groove portions and the common engagement groove portions of the plurality of lock units to which the operation shafts respectively correspond correspond to the engagement pins. The lock unit is securely locked when not in operation, and only the lock unit that needs to be operated is automatically locked by a series of movements of the operating shaft without adding another operating mechanism. Can be released.
According to the configuration of the sixth aspect, the operating shaft of the shelf positioning mechanism is rotated and driven in the Z direction by the operating shaft driving means provided outside the low temperature storage, and the operating shaft driving means is driven by the shelf driving means. By being configured to drive and control the operating shaft in response to the circumferential position information of the moving shelf, a sensor for detecting the circumferential position information of the moving shelf is not required inside the low temperature storage. It is possible to reduce the number of devices arranged in the low-temperature storage that can operate even under, and to operate the shelf positioning mechanism more reliably even in a low-temperature storage.

1 is a cross-sectional view of a cryogenic storage system that is an embodiment of the present invention. The top view which shows an example of a rotation stage (moving shelf) seeing from upper direction. The arrangement explanatory view of the shelf positioning mechanism which is one embodiment of the present invention. The whole figure of the shelf positioning mechanism which is one Embodiment of this invention, and sectional explanatory drawing of an operation | movement gear part and a release pin. The partially expanded view of a shelf positioning mechanism. Operation | movement explanatory drawing of a shelf positioning mechanism.

The shelf positioning mechanism according to the present invention is a shelf positioning mechanism for a plurality of moving shelves arranged in the Z direction orthogonal to the predetermined surface in a state that the shelf positioning mechanism can move within a predetermined surface independently of each other, and the plurality of movements An operating shaft disposed on a side of the shelf, and a plurality of lock units provided on the side corresponding to the plurality of moving shelves for positioning the moving shelf, wherein the operating shaft rotates and Z The plurality of lock units are provided independently to rotate and move in the Z direction according to the rotational position of the operating shaft, and the lock unit includes a cylindrical unit body; It has an engagement pin protruding inside the unit main body and a stopper pin protruding outside the unit main body, and the plurality of movable shelves can be engaged with the stopper pins and used for positioning the movable shelf. That a plurality of engagement blocks is provided, only the stopper pin of the desired of the locking unit, configured to perform positioning by engaging the engaging block is rotated by rotation of the actuating shaft, As long as the operation transmission path is simple, it can operate reliably in a low-temperature cabinet without using special equipment, and there are few heat conduction paths to reduce the cooling cost, any specific embodiment is possible. There may be.

The low-temperature storage system according to the present invention is not limited to any specific embodiment as long as it can efficiently store a large amount of storage objects using the above-described shelf positioning mechanism and can shorten the work time. Good.
In the shelf positioning mechanism and the cryogenic storage system according to the present invention, the plurality of movable shelves are in a plane orthogonal to the Z direction, such as linear movement, circumferential movement by rotation, movement along an arbitrary locus, etc. Any trajectory may be moved.
The Z direction is generally the vertical direction (the Z direction is also the vertical direction in the embodiments described later), but the Z direction is inclined with respect to the vertical direction or the horizontal direction. Also good.

First, a cold storage system 100 to which a shelf positioning mechanism according to an embodiment of the present invention is applied will be described with reference to the drawings.
The low temperature storage system 100 stores a sample to be stored at a low temperature. As shown in FIG. 1 and FIG. 2, the low temperature storage 101 in which the inside is kept at a low temperature, and the low temperature storage 101 are arranged in the low temperature storage 101. A plurality of disk-shaped rotary stages 130 that are movable shelves, a stage drive mechanism 140 that is a shelf driving means for rotating the plurality of rotary stages 130, and a container C held by the storage plate P as another storage plate And a picking mechanism (not shown) for transferring to P.

The low temperature storage 101 is for storing samples at an ultra-low temperature such as −190 ° C. by liquid nitrogen injected therein, and as shown in FIG. 1, an opening is provided on the upper surface of the low temperature storage 101. An opening / closing door (not shown) is provided in the opening.
Thus, by providing an opening on the upper surface of the low temperature storage 101, it is possible to suppress the cold air in the low temperature storage 101 from leaking to the outside, and to maintain the inside of the low temperature storage 101 at a low temperature.
In addition, since the low temperature storage 101 stores the sample at an ultra-low temperature using liquid nitrogen, it is possible to deal with a sample such as a living cell that needs to be stored at an ultra-low temperature such as −190 ° C.

As shown in FIG. 1, the plurality of rotary stages 130 are arranged vertically (in the Z direction) in the low temperature storage 101 while being rotatable independently of each other about a common vertical axis. Each rotary stage 130 may have a different rotation axis.
As shown in FIG. 2, each rotary stage 130 is provided with a plurality of storage areas 131 in which the trays T are arranged.
Each storage area 131 is provided with a frame 131a that supports both sides of the tray T and a passage slit 131b that is formed between the frames 131a on both sides and penetrates in the vertical direction.
A plurality of installation parts are provided on the tray T, and a storage plate P containing a plurality of containers C with caps containing samples is detachably installed in each installation part.

As shown in FIG. 2, each rotary stage 130 is provided with a slit 132 penetrating in the vertical direction.
The slit 132 has a shape and a size that allow the tray T and a plate-like member 141 described later to pass therethrough.
The uppermost rotation stage 130 is provided with a picking area for transferring the container C held on the storage plate P to another storage plate P. Thereby, since the picking operation | work which transfers a sample to the other storage plate P can be performed in the low temperature storage 101, the temperature of a sample can be maintained at low temperature.

  The stage drive mechanism 140 rotates each rotary stage 130 independently of each other, and is provided independently from the rotary stage 130 (that is, connected to the rotary stage 130 as shown in FIGS. 1 and 2). Plate member 141 (provided without being installed), elevating unit 142 for moving plate member 141 in the vertical direction, turning unit 143 for turning plate member 141 about the vertical axis, motor, actuator, etc. And a drive source (not shown) configured to drive the elevating unit 142 and the turning unit 143. The drive source (not shown) is disposed outside the low temperature storage 101.

In addition to the function of rotating the rotary stage 130 described above, the stage drive mechanism 140 has a function of transporting the tray T in the vertical direction.
That is, the stage driving mechanism 140 moves the plate member 141 below the tray T to be transferred, scoops up the tray T by the plate member 141 through the passage slit 131b of the rotation stage 130, and the slit 132 of the rotation stage 130. The tray T is moved up and down through.

Next, a shelf positioning mechanism 102 according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 3, the rotary stage 130, which is a plurality of moving shelves of the low-temperature storage system 100 as described above, is configured such that its outer peripheral portion is supported by a support frame 103 and can be rotated and moved in a horizontal plane. The shelf positioning mechanism 102 includes an operation shaft 110 that is disposed on the side of the rotary stage 130 and that can rotate and move up and down, and a plurality of lock units 120 that correspond to the plurality of rotary stages 130, respectively.

As shown in FIGS. 4 and 5, the lock unit 120 includes a cylindrical unit main body 121, an engagement pin 122 that protrudes inside the unit main body 121, and a stopper pin 123 that protrudes outside the unit main body 121. Have.
The operating shaft 110 is provided so as to penetrate the plurality of cylindrical unit bodies 121 and has a plurality of operating gear portions 111 respectively corresponding to the plurality of cylindrical unit bodies 121.
The upper end portion of the working shaft 110 is connected to the working shaft driving means 116 via the connecting shaft 117, and the working shaft 110 is configured to be rotated and driven in the vertical direction by the working shaft driving means 116. .
Since the operating shaft driving means 116 is disposed outside the low temperature storage 101, it is not necessary to use a special device that operates at an ultra-low temperature, and a known actuator, motor, or the like may be used.
Further, by forming the connecting shaft 117 with a material having low thermal conductivity, it is possible to suppress the intrusion of heat into the low temperature storage 101 and to reduce the cooling cost.

The operation gear portion 111 includes a passage groove portion 112 through which the engagement pin 122 passes without engaging when the operation shaft 110 is moved up and down, an engagement groove portion 113 with which the engagement pin 122 engages, and a common engagement groove portion 114. And have.
As shown in FIG. 4, each operating gear portion 111 is provided with a passage groove portion 112 at 10 locations that are equally divided into 12 at the same angular interval, and one engagement groove portion 113 and one common engagement groove portion 114. The engaging groove portions 113 are provided at different circumferential positions in all the operating gear portions 111, and the common engaging groove portions 114 are provided at the same circumferential position in all the operating gear portions 111.
By providing such an operation gear portion 111, the operation shaft 110 is rotationally indexed and moved upward, so that any one engagement pin 122 in the lock unit 120 corresponding to each of the plurality of rotation stages 130 is obtained. Only the predetermined locking unit 120 is selectively operated by engaging only the engaging groove 113, or all the engaging pins 122 are engaged with the common engaging groove 114, and all the locking units 120 are simultaneously engaged. Can be operated.

A unit stopper 124 that prevents upward movement is provided on the side of the plurality of lock units 120, and a release pin 115 that releases the unit stopper 124 by movement upward is provided on the operating shaft 110. It has been.
When the operating shaft 110 rotates and the engaging groove portion 113 and the common engaging groove portion 114 of the operating gear portion 111 engage with the engaging pin 122 of the predetermined lock unit 120, It is provided at a circumferential position where the unit stopper 124 corresponding to the lock unit 120 is released.
In this embodiment, since the engagement pin 122 and the unit stopper 124 of the lock unit 120 are provided on the opposite side of 180 ° with respect to the operation shaft 110, the release pin 115 is the engagement groove portion 113 of the operation gear portion 111. And the common engagement groove 114 is provided so as to protrude on the opposite side of 180 °.

As shown in FIG. 5, the unit stopper 124 is elastically biased toward the operating shaft 110, and when the unit main body 121 of the lock unit 120 rises, the upper end edge contacts the unit stopper 124 and is not intended. The rise of 120 is prevented.
When the operating shaft 110 is raised with the release pin 115 positioned on the unit stopper 124 side, the unit stopper 124 is pushed against the urging force by the release pin 115 and does not contact the upper end edge of the unit body 121. By being in the positioned state, the lock unit 120 to be operated is allowed to rise.

The engaging groove portion 113 and the common engaging groove portion 114 of the operating gear portion 111 engage with the engaging pin 122 of the predetermined lock unit 120, and the lock unit 120 is raised by the raising of the operating shaft 110, and also in the rotation direction. The lock unit 120 is also rotated by the rotation of the operating shaft 110 that is engaged.
On the other hand, the lock unit 120 in which the passage groove portion 112 of the operating gear portion 111 is located at the position of the engaging pin 122 does not rise in conjunction with the raising of the operating shaft 110. When it rises above 122, it does not rotate in conjunction with the rotation of the operating shaft 110.
Thus, by determining and raising the rotational position of the operation shaft 110, only the stopper pin 123 protruding outside the unit body 121 of the desired lock unit 120 can be rotated by the rotation of the operation shaft 110. .

A notch 125 is provided below the unit main body 121, and the engagement pin 122 of the unit main body 121 is in the state where it is not engaged with the engagement groove 113 and the common engagement groove 114 of the operating gear portion 111. The notch 125 is configured to prevent rotation of the lock unit 120 by engaging with a rotation fixing portion 126 fixedly provided on the support frame 103 in a state of being positioned below.
In a state where the notch 125 is engaged with the rotation fixing portion 126, the stopper pin 123 extends toward the rotation stage 130, and the stopper pin 123 is engaged with the engagement block 134 of the rotation stage 130 as will be described later. The rotation of the rotary stage 130 is restricted.

The operation of the cryogenic storage system 100 having the shelf positioning mechanism 102 configured as described above will be described.
A plurality of engagement blocks 134 used for positioning in the rotational direction are provided at predetermined positions on the outer periphery of each rotary stage 130 in the low-temperature storage system 100 shown in FIGS. 1 to 3.
As shown in FIG. 6, the engagement block 134 includes a fixing groove 135 into which the stopper pin 123 can be fitted from above, and a contact wall 136 that extends one wall portion of the fixing groove 135 upward. Yes.
When the rotary stage 130 is stopped, as shown in FIG. 6 a, the stopper pin 123 from which the unit main body 121 protrudes is engaged with the engaging block 134 in a state where it is positioned at the lowermost position of the lock unit 120 and is rotationally fixed. The rotation of the rotary stage 130 is restricted by fitting in the fixed groove 135.

When rotating the rotary stage 130, as described above, the operating shaft 110 rotates and the engaging groove 113 of the operating gear portion 111 is divided into circumferential positions where the engaging pin 122 of the lock unit 120 is engaged. The lock unit 120 is moved upward as the operating shaft 110 is moved upward, and the stopper pin 123 is moved above the fixing groove 135 of the engagement block 134 as shown in FIG.
Then, as shown in FIG. 6 c, the rotary shaft 130 can be freely rotated by the stage drive mechanism 140 by retracting the operating shaft 110 to a position where the stopper pin 123 does not interfere with the engagement block 134. It becomes.

Next, an operation when the rotary stage 130 is rotationally positioned and stopped will be described.
Until the engagement block 134 as the positioning target approaches, the rotary stage 130 rotates under the control of the stage drive mechanism 140 serving as the shelf drive means while the lock unit 120 remains in the state shown in FIG.
The operating shaft driving means 116 receives the position information that the engagement block 134 that is the positioning target approaches from the stage driving mechanism 140, and rotates the operating shaft 110 to the state of the stopper pin 123 shown in FIG. 6d.
When the rotary stage 130 is further rotated by the stage driving mechanism 140, the contact wall 136 of the engagement block 134 contacts the stopper pin 123 as shown in FIG. 6d, and the stopper pin 123 is pressed to operate as shown in FIG. 6e. The shaft 110 is rotated.
The operating shaft driving means 116 detects the position of the engagement block 134, that is, the indexing position of the rotary stage 130 by detecting that the stopper pin 123 and the contact wall 136 are pressed against each other. The stage drive mechanism 140 can be stopped.
After the rotation stage 130 has stopped accurately, as shown in FIG. 6f, the operating shaft 110 is lowered, the rotation stage 130 is stopped, and the rotation is returned to the restricted state.

  When it is desired to make all the rotation stages 130 free for maintenance or the like, the operation shaft 110 is rotated so that the common engagement groove portion 114 of the operation gear portion 111 is engaged with the engagement pin 122 of the lock unit 120. By indexing to the directional position and moving the operating shaft 110 upward to rotate, the stopper pins 123 of all the lock units 120 are retracted to a position where they do not interfere with the engagement block 134 as shown in FIG. 6c.

In this embodiment, the moving shelf is used as a rotary stage and moves in the circumferential direction by rotation. However, any trajectory as long as it is in a plane perpendicular to the Z direction, such as linear movement, movement along an arbitrary trajectory, etc. The shelf driving means is not limited to the stage driving mechanism 140 described above, and any configuration and system may be used.
Further, when the operating shaft driving means 116 receives the position information that the engagement block 134 as the positioning target is approaching, as described above, the output from the shelf driving means such as the encoder of the stage driving mechanism 140 is directly used. Alternatively, the output of the position detecting means provided separately may be received as position information.
Furthermore, position detection, signal processing / calculation, control of equipment, etc. may be performed by the control unit of the stage drive mechanism 140 or the operating shaft drive means 116, or a separate control unit may be provided. How the plurality of means share the functions of detection, processing, calculation, control, etc., and how to exchange signals with each other may be appropriately selected according to the specific configuration to be employed.

DESCRIPTION OF SYMBOLS 100 ... Low temperature storage system 101 ... Low temperature storage 102 ... Shelf positioning mechanism 103 ... Support frame 110 ... Actuation shaft 111 ... Actuation gear part 112 ... Passing groove part 113 ... Relation Joint groove 114 ... Common engagement groove 115 ... Release pin 116 ... Operating shaft drive means 117 ... Connection shaft 120 ... Lock unit 121 ... Unit main body 122 ... Engagement pin 123 ... Stopper pin 124 ... Unit stopper 125 ... Notch 126 ... Rotation fixing part 130 ... Rotation stage (moving shelf)
131 ... Storage area 131a ... Frame 131b ... Passing slit 132 ... Slit 134 ... Engagement block 135 ... Fixing groove 136 ... Abutment wall 140 ... Stage drive mechanism ( Shelf drive means)
141 ... Plate-like member (stage drive member, vertical direction transfer means)
142 ... Elevating unit 143 ... Turning unit T ... Tray P ... Storage plate C ... Container

Claims (6)

A shelf positioning mechanism for a plurality of moving shelves arranged in the Z direction perpendicular to the predetermined plane in a state that is movable within the predetermined plane independently of each other,
An operating shaft disposed on the side of the plurality of movable shelves, and a plurality of lock units that are provided on the sides corresponding to the plurality of movable shelves to position the movable shelf,
The operating shaft is provided to be rotatable and movable in the Z direction;
The plurality of lock units are provided to be independently rotatable and movable in the Z direction according to the rotational position of the operating shaft ,
The lock unit has a cylindrical unit main body, an engagement pin protruding inside the unit main body, and a stopper pin protruding outside the unit main body,
The plurality of movable shelves are provided with a plurality of engagement blocks that can be engaged with the stopper pins and are used for positioning the movable shelves,
A shelf positioning mechanism configured to perform positioning by rotating only the stopper pin of the desired lock unit by rotating the operating shaft and engaging the engagement block . The operating shaft is provided so as to penetrate the cylindrical unit body, and has a plurality of operating gear portions at positions corresponding to the cylindrical unit body,
The operating gear portion has at least one passage groove portion through which the engagement pin passes in the Z direction, and an engagement groove portion with which the engagement pin engages,
The shelf positioning mechanism according to claim 1, wherein the engagement groove portions are arranged at different circumferential positions in the plurality of operation gear portions. The operating gear portion further includes a common engaging groove portion with which the engaging pin engages;
The shelf positioning mechanism according to claim 2, wherein the common engagement groove is disposed at the same circumferential position in at least two of the operating gears. A unit stopper is provided on the side of the plurality of lock units,
The operating shaft is provided with a plurality of release pins corresponding to the plurality of lock units to release the unit stopper,
The plurality of release pins can release the unit stopper when the engagement groove portions and the common engagement groove portions of the plurality of lock units to which the operation shafts respectively correspond are engaged with the engagement pins. The shelf positioning mechanism according to claim 3 , wherein the shelf positioning mechanism is provided at a different position. A low-temperature storage system for storing storage objects at low temperatures,
A low-temperature hangar, a plurality of movable shelves arranged vertically in the low-temperature hangar in a state of being rotatable independently of each other about a vertical axis, and shelf driving means for rotating the movable shelf, A cryogenic storage system comprising the shelf positioning mechanism according to any one of Items 4 to 5. The operating shaft of the shelf positioning mechanism is driven in the rotation and Z direction by an operating shaft driving means provided outside the low temperature storage.
6. The low-temperature storage according to claim 5, wherein the operating shaft driving means is configured to drive and control the operating shaft in response to positional information in the circumferential direction of the movable shelf by the shelf driving means. system.

Images