Unlocking mechanism of double-layer cryopreservation rack

Abstract

The utility model relates to the technical field of biological sample cryopreservation equipment, in particular to an unlocking mechanism of a double-layer cryopreservation frame, which comprises a support plate and a support truss arranged on the support plate, and a double-stroke mechanical arm capable of extending downwards is horizontally and slidably arranged on the support truss. The double-stroke mechanical arm is provided with a first manipulator used for clamping a cryopreservation frame assembly arranged in the liquid nitrogen tank; the cryopreservation frame assembly comprises a first cryopreservation frame and a second cryopreservation frame, and the first cryopreservation frame and the second cryopreservation frame are spliced and combined through a locking component; the movable plate is movably arranged on the supporting plate, and an unlocking assembly used for applying force to the locking component to unlock the locking component is arranged on the movable plate; after the first cryopreservation frame and the second cryopreservation frame are taken out of the liquid nitrogen tank to the specified height, the locking component is aligned with the unlocking assembly, then the unlocking assembly is operated to apply relative force to the locking component, unlocking treatment is conducted on the locking component, and the vertical material taking efficiency of the cryopreservation equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of biological sample freezing equipment, in particular to an unlocking mechanism of a double-layer freezing rack. Background Art

[0002] In the biomedical field, biological samples such as blood samples, vaccines, bacteria and viruses need to be placed in liquid nitrogen tanks for long-term active preservation. However, before freezing and storing biological samples, they need to be placed in test tube boxes, and then multiple test tube boxes are placed one by one on the freezing rack. After the specified number of test tube boxes are placed, the freezing rack can be placed in the liquid nitrogen tank for freezing.

[0003] However, the existing freezing racks placed in the liquid nitrogen tank are independently arranged. When the freezing racks need to be taken out of the liquid nitrogen tank, only one freezing rack can be taken out at a time, which affects the loading efficiency of the test tube box. In order to improve the loading efficiency, a pair of freezing racks are arranged into double layers, and the pair of freezing racks are spliced ​​together so that when the freezing racks in the liquid nitrogen tank are taken out, a pair of freezing racks can be taken out at a time. After the freezing racks are taken out, a specific unlocking mechanism is needed to automatically unlock the pair of freezing racks to facilitate the placement of the test tube box; therefore, an unlocking mechanism for a double-layer freezing rack is provided to solve the above technical problems. Utility Model Content

[0004] The utility model aims to provide an unlocking mechanism for a double-layer freezing rack in view of the deficiencies in the prior art, so as to solve the technical problem that a pair of freezing racks need to be automatically unlocked after the freezing racks are taken out of a liquid nitrogen tank.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A double-layer freezing rack unlocking mechanism comprises a support plate and a support truss arranged on the support plate, a double-stroke mechanical arm which can be extended downward is horizontally slidably arranged on the support truss, and a first mechanical hand for clamping a freezing rack assembly placed in a liquid nitrogen tank is installed on the double-stroke mechanical arm; the freezing rack assembly comprises a first freezing rack and a second freezing rack, and the first freezing rack and the second freezing rack are spliced ​​and assembled by a locking component;

[0007] It also includes a movable plate movably arranged on the support plate, on which an unlocking component for applying force to the locking component to unlock it is arranged.

[0008] Furthermore, a third slide rail is arranged on the support plate, the movable plate is slidably arranged on the third slide rail, and a third driving module for driving the movable plate to move is arranged on the support plate.

[0009] Furthermore, the locking component includes a fixed plate arranged on the top of the second freezing rack, and a plurality of vertically arranged connecting columns are provided at the bottom of the first freezing rack, connecting holes for inserting the connecting columns are provided on the fixed plate, and a pair of clamping parts for locking the connecting columns placed in different connecting holes are provided inside the fixed plate, the clamping parts are symmetrically arranged, and the unlocking directions of the clamping parts on both sides are relatively arranged.

[0010] Furthermore, the clamping part includes a pair of first sliding grooves arranged in the fixed plate and arranged in parallel, a sliding shaft is slidably provided in each first sliding groove, a clamping groove is provided on each connecting column, and a clamping block that can be inserted into the clamping groove is provided on the sliding shaft, and a part of the clamping block is placed in the connecting hole; it also includes a blocking piece fixedly arranged on the side of the fixed plate, and the blocking piece is used to simultaneously block the pressing end parts of the sliding shafts on both sides to prevent the sliding shafts from escaping from the first sliding groove.

[0011] Furthermore, one end of the sliding shaft is a pressing end, and the other end is provided with a guide shaft consistent with its axial direction. The diameter of the guide shaft is smaller than the diameter of the sliding shaft. A guide groove for the guide shaft to slide is provided on the inner side of the first sliding groove. A spring is wound around the guide shaft, and the spring is placed in the first sliding groove.

[0012] Furthermore, the unlocking assembly includes a pair of unlocking parts that are symmetrically arranged and arranged on the movable plate, and the movable plate is provided with an unlocking slot for making way for the freezing rack assembly, and the unlocking parts are placed on both sides of the unlocking slot for applying force to the sliding shaft; the unlocking part includes a supporting block fixedly arranged on the movable plate, the supporting block is provided with a receiving slot, and a movable block that can slide toward or away from the unlocking slot is provided in the receiving slot, and the movable block is provided with a pair of push rods for respectively pushing different sliding shafts.

[0013] Furthermore, holes are provided on both sides of the fixed plate close to the top rod, and the movable block is provided with pins that can be inserted into the holes.

[0014] Furthermore, a vertically arranged sliding rod is provided at the bottom of the movable block, a horizontally arranged first guide rail is provided on the movable plate, and the length direction of the first guide rail is perpendicular to the movable direction of the movable block, a sliding frame is slidably provided on the first guide rail, a pair of second sliding grooves are provided on the sliding frame, and the sliding rods on both sides are respectively placed in different second sliding grooves, and the sliding frame reciprocates to push the sliding rods placed on both sides of the unlocking slot to move closer to or away from each other through the second sliding grooves on both sides.

[0015] Furthermore, a second stepper motor is mounted on the movable plate, and a second screw rod is disposed on the output shaft of the second stepper motor, the axial direction of the second screw rod being consistent with the sliding direction of the sliding frame, and the second screw rod is threadedly connected to the sliding frame.

[0016] Furthermore, a plurality of limiting rollers are provided around the unlocking slot for enabling the freezing rack assembly to move vertically upward or vertically downward.

[0017] The beneficial effects of the utility model are as follows: when it is necessary to take out the freezing rack assembly in the liquid nitrogen tank, the double-stroke robot arm is first controlled to slide horizontally on the supporting truss, thereby driving the first robot arm to align with the freezing rack assembly in the liquid nitrogen tank, the double-stroke robot arm is operated to drive the first robot arm to move downward to a specified height, the first robot arm is operated to clamp the top of the first freezing rack, and finally the double-stroke robot arm is operated again, the first robot arm is used to drive the first freezing rack to move upward to take it out of the liquid nitrogen tank, and the second freezing rack is taken out at the same time through the locking component, thereby completing the automatic material removal process of the freezing rack assembly.

[0018] After the first freezing rack and the second freezing rack are taken out of the liquid nitrogen tank to the specified height, the locking component is aligned with the unlocking component, and then the unlocking component is operated to apply a relative force to the locking component to unlock the locking component; while unlocking, the unlocking component supports the second freezing rack, and the first freezing rack is driven to move upward to the specified height through the cooperation of the double-stroke robotic arm and the first manipulator, and then the double-stroke robotic arm is controlled to slide horizontally to remove the first freezing rack from the second freezing rack, thereby completing the automatic unlocking and separation of the first freezing rack and the second freezing rack, so that the test tube boxes placed on the first freezing rack and the second freezing rack can be taken out one by one, or the test tube boxes that need to be frozen can be placed one by one on the first freezing rack and the second freezing rack, which greatly improves the upper and lower material retrieval efficiency of the freezing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0020] Figure 2 This is a diagram showing the separation state of the first freezing rack and the second freezing rack of the utility model.

[0021] Figure 3 It is a structural schematic diagram of the locking component of the utility model.

[0022] Figure 4 This is a schematic diagram of the first part of the locking component of the utility model.

[0023] Figure 5 This is a schematic diagram of the second structure of the locking component of the utility model.

[0024] Figure 6 This is a schematic diagram of the unlocking component structure of the utility model.

[0025] Figure 7 It is a structural schematic diagram of the unlocking part of the utility model.

[0026] Reference numerals include:

[0027] 4. Support plate; 501. Support truss; 605. First freezing rack; 606. Second freezing rack; 607. Storage position; 608. Limiting spring; 609. Fixing plate; 610. Connecting column; 611. Connecting hole; 612. First slide groove; 613. Sliding shaft; 614. Block; 615. Slot; 616. Bevel; 617. Guide shaft; 618. Spring; 619. Guide groove; 620. Block; 624. Socket;

[0028] 704, first movable frame; 705, first driving module; 706, second movable frame; 707, second driving module; 708, double-stroke robot arm; 709, single-stroke robot arm; 710, first manipulator; 712, second manipulator; 713, third driving module; 714, movable plate; 7141, unlocking slot; 715, unlocking assembly; 7151, sliding frame; 7152, first guide rail; 7153, second stepping motor; 7154, second lead screw; 7155, second slide groove; 7156, supporting block; 7157, accommodating groove; 7158, movable block; 7159, ejector rod; 71510, latch; 71511, slide rod; 716, pushing assembly; 717, limiting roller; 718, third slide rail. DETAILED DESCRIPTION

[0029] The unlocking mechanism of a double-layer freezing rack of the utility model is described in detail below with reference to the accompanying drawings.

[0030] like Figure 1As shown, an embodiment of an unlocking mechanism of a double-layer freezing rack of the utility model includes a support plate 4 fixedly arranged on the top of a liquid nitrogen tank and a support truss 501 arranged on the support plate 4, a tank cover for covering the top opening of the liquid nitrogen tank (not shown in the figure) is placed, and a plurality of freezing rack assemblies are placed inside the liquid nitrogen tank. In order to realize automatic removal of the freezing rack assembly from the liquid nitrogen tank, a first movable frame 704 that can slide horizontally and a first driving module 705 for driving the first movable frame 704 to slide are provided on the support truss 501. The frame 704 is provided with a second movable frame 706 that can slide horizontally and a second driving module 707 for driving the second movable frame 706 to slide, and the sliding direction of the first movable frame 704 is perpendicular to the sliding direction of the second movable frame 706; in addition, a double-stroke mechanical arm 708 that can extend downward is installed on the second movable frame 706, and a first mechanical hand 710 for clamping the freezing rack assembly is installed on the double-stroke mechanical arm 708, and the double-stroke mechanical arm 708 is used to drive the first mechanical hand 710 to move up and down to take out the freezing rack assembly in the liquid nitrogen tank. A single-stroke mechanical arm 709 that can extend downward is also installed on the second movable frame 706, and a second mechanical hand 712 for carrying the tank cover is installed on the single-stroke mechanical arm 709, and the single-stroke mechanical arm 709 is used to drive the second mechanical hand 712 to move up and down.

[0031] like Figure 2 As shown, the freezing rack assembly includes a first freezing rack 605 and a second freezing rack 606, and the first freezing rack 605 and the second freezing rack 606 are spliced ​​and combined together by a locking component, so that the first freezing rack 605 and the second freezing rack 606 can be placed in the liquid nitrogen tank at the same time, or the first freezing rack 605 and the second freezing rack 606 can be taken out of the liquid nitrogen tank at the same time, which greatly improves the efficiency of storing test tube boxes; and after taking out, when it is necessary to separate the first freezing rack 605 and the second freezing rack 606, a relative force is applied to the locking component to unlock the locking component, so that the first freezing rack 605 and the second freezing rack 606 can be separated. A plurality of storage positions 607 for placing test tube boxes are provided on the first freezing rack 605 and the second freezing rack 606, and a pair of limiting spring pieces 608 for clamping the test tube boxes are provided on each storage position 607. After the test tube box is pushed to the storage position 607, the limiting spring pieces 608 are used to clamp the test tube box, thereby achieving limiting processing of the test tube box, so that the test tube box can be placed on the storage position 607 more stably.

[0032] Specifically, when the freezing rack assembly in the liquid nitrogen tank needs to be taken out, the first driving module 705 is first operated to drive the first movable frame 704 to move on the supporting truss 501, and then the second driving module 707 is operated to drive the second movable frame 706 to move on the first movable frame 704, so as to adjust the position of the second manipulator 712 to adjust the second manipulator 712 to be directly above the tank cover, and then the single-stroke robot arm 709 is operated to drive the second manipulator 712 to move downward to a specified height, and then the second manipulator 712 is operated to clamp the tank cover, and the single-stroke robot arm 709 and the second driving module 707 are operated again to move the tank cover to the specified position through the second manipulator 712. At this time, the first manipulator 710 is placed above the opening of the liquid nitrogen tank, and then the first movable frame 704 is driven to move through the first driving module 705 to drive the first manipulator 710 to align with the freezing rack assembly in the liquid nitrogen tank (there are multiple freezing rack assemblies placed in the liquid nitrogen tank, so the alignment needs to be adjusted), and the double-stroke robot arm 708 is operated to drive the first manipulator 710 to move downward to a specified height, and the first manipulator 710 is operated to clamp the top of the first freezing rack 605. Finally, the double-stroke robot arm 708 is operated again, and the first manipulator 710 drives the first freezing rack 605 to move upward to take it out of the liquid nitrogen tank, and the second freezing rack 606 is taken out at the same time through the locking component, thereby completing the automatic material removal process of the freezing rack assembly.

[0033] After the freezing rack assembly is taken out, in order to unlock the locking component, the unlocking mechanism further includes a third slide rail 718 arranged on the support plate 4 and a movable plate 714 slidably arranged on the third slide rail 718, and the movable plate 714 is provided with an unlocking slot 7141 (such as Figure 7 As shown in the figure, during the process of taking the freezing rack assembly out of the liquid nitrogen tank by the first manipulator 710, the freezing rack assembly passes through the unlocking slot 7141, and when the freezing rack assembly is taken out to the specified height, the locking component on the freezing rack assembly is placed at the unlocking slot 7141; in addition, the support plate 4 is movably arranged on the support plate 4 through the third slide rail 718 to make way for the tank cover, so as to facilitate the removal of the tank cover from the opening of the liquid nitrogen tank or to re-place it at the opening. In order to drive the movable plate 714 to slide on the third slide rail 718, the support plate 4 is provided with a third driving module 713 for driving the movable plate 714 to move, and the third driving module 713 is operated to drive the movable plate 714 to automatically slide on the third slide rail 718.

[0034] Furthermore, an unlocking assembly 715 for applying force to the locking component to unlock it and a pushing assembly 716 for pushing out the test tube box placed on the storage position 607 are provided on the movable plate 714; under the mechanical cooperation of the double-stroke mechanical arm 708 and the first mechanical hand 710, after the freezing rack assembly is taken out to a specified height, the locking component on the freezing rack assembly is aligned with the unlocking assembly 715, and then the unlocking assembly 715 is operated to apply relative force to the locking component to unlock the locking component; while unlocking, the unlocking assembly 715 supports the second freezing rack 606 The first cryopreservation rack 605 is supported by the double-stroke robot arm 708 and the first robot arm 710, and the first cryopreservation rack 605 is driven to move upward to a specified height, and then the second driving module 707 is operated to drive the second movable rack 706 to move, so as to remove the first cryopreservation rack 605 from the second cryopreservation rack 606; at this time, the second robot arm 712 is placed above the second cryopreservation rack 606, and the single-stroke robot arm 709 and the second robot arm 712 are operated to drive the second cryopreservation rack 606 to move upward and be placed at the same height as the first cryopreservation rack 605, thereby completing the unlocking and separation process of the cryopreservation rack assembly.

[0035] like Figure 3-5 As shown, the locking component includes a fixing plate 609 arranged on the top of the second freezing rack 606, and a plurality of vertically arranged connecting posts 610 are provided at the bottom of the first freezing rack 605, and connecting holes 611 for inserting the connecting posts 610 are provided on the fixing plate 609, and a pair of clamping parts for locking the connecting posts 610 placed in different connecting holes 611 are provided inside the fixing plate 609, and the clamping parts are symmetrically arranged, and the unlocking directions of the clamping parts on both sides are arranged oppositely; after the connecting posts 610 on the first freezing rack 605 are inserted into the connecting holes 611 on the fixing plate 609, the connecting posts 610 are automatically clamped by the clamping parts, so that the first The freezing rack 605 and the second freezing rack 606 are spliced ​​and combined together, so that the first freezing rack 605 and the second freezing rack 606 can be placed in the liquid nitrogen tank at the same time, or the first freezing rack 605 and the second freezing rack 606 can be taken out of the liquid nitrogen tank at the same time, which greatly improves the efficiency of storing test tube boxes; and after taking out, when it is necessary to separate the first freezing rack 605 and the second freezing rack 606, the unlocking component 715 applies relative force to the clamping parts on both sides, so that the clamping parts on both sides are unlocked at the same time, so that the connecting column 610 can be separated from the connecting hole 611, and the separation of the first freezing rack 605 and the second freezing rack 606 is completed.

[0036] Among them, the clamping part includes a pair of first sliding grooves 612 arranged in the fixed plate 609 and arranged in parallel. A sliding shaft 613 is slidably provided in each first sliding groove 612, and a clamping groove 615 is provided on each connecting column 610. A clamping block 614 that can be clamped into the clamping groove 615 is provided on the sliding shaft 613, and a part of the clamping block 614 is placed in the connecting hole 611; after the connecting column 610 is fully inserted into the connecting hole 611, the clamping block 614 is clamped into the clamping groove 615 to clamp the connecting column 610. When unlocking is required, the sliding shaft 613 is pressed from the opening of the first sliding groove 612 to make the clamping block 614 disengage from the clamping groove 615.

[0037] However, in order to realize automatic clamping of the connecting column 610, one end of the sliding shaft 613 is a pressing end, and the other end is provided with a guide shaft 617 which is consistent with its axial direction. The diameter of the guide shaft 617 is smaller than the diameter of the sliding shaft 613. A guide groove 619 for the guide shaft 617 to slide is provided inside the first sliding groove 612. A spring 618 is wound around the guide shaft 617, and the spring 618 is placed in the first sliding groove 612. After the pressing end of the sliding shaft 613 is pressed through the opening of the first sliding groove 612, The sliding shaft 613 slides with the block 614 in the first slide groove 612, the guide shaft 617 slides in the guide groove 619, the spring 618 is compressed, and then the connecting column 610 is inserted into the connecting hole 611, and then the force on the sliding shaft 613 is stopped. Under the action of the compression spring 618, the sliding shaft 613 and the block 614 are pushed to reset, so that the block 614 is inserted into the slot 615, so as to clamp the connecting column 610 and complete the splicing of the first freezing rack 605 and the second freezing rack 606. In addition, the clamping part also includes a blocking piece 620 fixedly arranged on the side of the fixed plate 609, which is used to simultaneously block the pressing end parts of the sliding shaft 613 on both sides to prevent the sliding shaft 613 from escaping from the first slide groove 612.

[0038] Preferably, the bottom end of the connecting column 610 is hemispherical, and a bevel 616 in contact with the bottom end of the connecting column 610 is provided on the top surface of the block 614. When the connecting column 610 is inserted into the connecting hole 611, the bottom end of the connecting column 610 contacts the bevel 616, and then the connecting column 610 continues to apply downward force, and the bottom end of the connecting column 610 slides on the bevel 616, thereby pushing the block 614 to move in a direction close to the spring 618. The block 614 slides with the sliding shaft 613 to compress the spring 618. When the connecting column 610 moves downward to disengage from the bevel 616 and aligns the block 614 with the slot 615, under the action of the compression spring 618, the block 614 and the sliding shaft 613 are pushed to reset, so that the block 614 is inserted into the slot 615 to clamp the connecting column 610.

[0039] like Figure 6-7As shown, the unlocking assembly 715 includes a pair of unlocking parts that are symmetrically arranged on the movable plate 714, and the unlocking parts are placed on both sides of the unlocking slot 7141 to apply force to the sliding shaft 613; wherein the unlocking part includes a supporting block 7156 fixedly arranged on the movable plate 714, the supporting block 7156 is provided with a receiving slot 7157, and a movable block 7158 that can slide toward the unlocking slot 7141 or away from the unlocking slot 7141 is provided in the receiving slot 7157, and a pair of push rods 7159 for pushing different sliding shafts 613 respectively are provided on the movable block 7158. After the movable blocks 7158 placed on both sides of the unlocking slot 7141 are driven to move in a direction close to each other, the push rods 7159 on both sides push all the sliding shafts 613 set in the fixed plate 609, so that the blocking block 614 on the sliding shaft 613 disengages from the blocking slot 615 on the connecting column 610.

[0040] In addition, a plug hole 624 is provided on both sides of the fixed plate 609 near the top rod 7159, and a latch 71510 that can be inserted into the plug hole 624 is provided on the movable block 7158. Before the top rod 7159 contacts the sliding shaft 613, the latch 71510 is first inserted into the plug hole 624, so that after the block 614 is separated from the card slot 615, the second freezing rack 606 can be supported by the top rod 7159 and the latch 71510, so that the first manipulator 710 can drive the first freezing rack 605. It moves upward to remove it from the second freezing rack 606; and, when the top rod 7159 does not apply force to the sliding shaft 613, part of the latch 71510 is inserted into the insertion hole 624, which can also support the second freezing rack 606, so that the second manipulator 712 can clamp the second freezing rack 606, and it is also convenient to reinsert the connecting column 610 at the bottom of the first freezing rack 605 into the connecting hole 611 to realize the splicing combination of the first freezing rack 605 and the second freezing rack 606.

[0041] In order to drive the movable blocks 7158 on both sides to move toward the unlocking slot 7141, a vertically arranged sliding bar 71511 is provided at the bottom of the movable block 7158, and a horizontally arranged first guide rail 7152 is provided on the movable plate 714, and the length direction of the first guide rail 7152 is perpendicular to the moving direction of the movable block 7158, a sliding frame 7151 is slidably provided on the first guide rail 7152, and a pair of second sliding grooves 7155 are provided on the sliding frame 7151, and the sliding bars 71511 on both sides are respectively placed in different second sliding grooves 7155, and the sliding frame 7151 reciprocates to push the sliding bars 71511 on both sides of the unlocking slot 7141 through the second sliding grooves 7155 on both sides, and the sliding bars 71511 on both sides drive the movable blocks 7158 on both sides of the unlocking slot 7141 to move closer to or away from each other, so as to unlock the first freezing rack 605 and the second freezing rack 606. In order to drive the sliding frame 7151 to slide on the first guide rail 7152, a second stepping motor 7153 is installed on the movable plate 714, and a second screw rod 7154 whose axial direction is consistent with the sliding direction of the sliding frame 7151 is provided on the output shaft of the second stepping motor 7153, and the second screw rod 7154 is threadedly connected to the sliding frame 7151. By starting the second stepping motor 7153 to drive the second screw rod 7154 to rotate, the sliding frame 7151 is driven to slide back and forth on the first guide rail 7152, so as to drive the movable blocks 7158 on both sides to move closer to or away from each other. Additionally, a plurality of limiting rollers 717 for limiting the position of the freezing rack assembly are provided around the unlocking slot 7141. Under the action of the limiting rollers 717, the freezing rack assembly can always move vertically upward or vertically downward during the process of the first manipulator 710 taking the freezing rack assembly out of or putting it into the liquid nitrogen tank; moreover, the sliding shaft 613 can be aligned with the top rod 7159 every time, thereby improving the unlocking efficiency.

[0042] In summary, it can be seen that the utility model has the above-mentioned excellent characteristics, which can enhance the performance unprecedented in the prior art and become a product with great practical value.

[0043] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. An unlocking mechanism for a double-layer freezing rack, characterized in that: The invention comprises a support plate (4) and a support truss (501) arranged on the support plate (4); a double-stroke mechanical arm (708) which can extend downward is horizontally slidably arranged on the support truss (501); and a first mechanical arm (710) for clamping a freezing rack assembly placed in a liquid nitrogen tank is installed on the double-stroke mechanical arm (708); the freezing rack assembly comprises a first freezing rack (605) and a second freezing rack (606), and the first freezing rack (605) and the second freezing rack (606) are spliced ​​and assembled by a locking component; It also includes a movable plate (714) movably arranged on the support plate (4), and an unlocking component (715) for applying force to the locking component to unlock it is arranged on the movable plate (714).

2. The unlocking mechanism of a double-layer freezing rack according to claim 1, characterized in that: A third slide rail (718) is arranged on the support plate (4), the movable plate (714) is slidably arranged on the third slide rail (718), and a third driving module (713) for driving the movable plate (714) to move is arranged on the support plate (4).

3. The unlocking mechanism of a double-layer freezing rack according to claim 1, characterized in that: The locking component includes a fixing plate (609) arranged on the top of the second freezing rack (606), and a plurality of vertically arranged connecting columns (610) are provided at the bottom of the first freezing rack (605), and connecting holes (611) for inserting the connecting columns (610) are provided on the fixing plate (609), and a pair of clamping parts for locking the connecting columns (610) placed in different connecting holes (611) are provided inside the fixing plate (609), the clamping parts are symmetrically arranged, and the unlocking directions of the clamping parts on both sides are relatively arranged.

4. The unlocking mechanism of a double-layer freezing rack according to claim 3, characterized in that: The clamping portion includes a pair of first sliding grooves (612) arranged in parallel in the fixing plate (609), a sliding shaft (613) is slidably arranged in each first sliding groove (612), a clamping groove (615) is provided on each connecting column (610), and a clamping block (614) that can be clamped into the clamping groove (615) is provided on the sliding shaft (613), and a part of the clamping block (614) is placed in the connecting hole (611); it also includes a blocking piece (620) fixedly arranged on the side of the fixing plate (609), and the blocking piece (620) is used to simultaneously block the pressing end parts of the sliding shafts (613) on both sides to prevent the sliding shafts (613) from escaping from the first sliding grooves (612).

5. The unlocking mechanism of a double-layer freezing rack according to claim 4, characterized in that: One end of the sliding shaft (613) is a pressing end, and the other end is provided with a guide shaft (617) which is consistent with its axial direction. The diameter of the guide shaft (617) is smaller than the diameter of the sliding shaft (613). A guide groove (619) for the guide shaft (617) to slide is provided inside the first sliding groove (612). A spring (618) is wound around the guide shaft (617), and the spring (618) is placed in the first sliding groove (612).

6. The unlocking mechanism of a double-layer freezing rack according to claim 4, characterized in that: The unlocking assembly (715) includes a pair of unlocking parts which are symmetrically arranged on the movable plate (714), and an unlocking slot (7141) for giving way to the freezing rack assembly is provided on the movable plate (714). The unlocking parts are arranged on both sides of the unlocking slot (7141) for applying force to the sliding shaft (613); the unlocking parts include a support block (7156) fixedly provided on the movable plate (714), and a receiving slot (7157) is provided on the support block (7156), and a movable block (7158) which can slide toward the unlocking slot (7141) or away from the unlocking slot (7141) is provided in the receiving slot (7157), and a pair of push rods (7159) are provided on the movable block (7158) for respectively pushing different sliding shafts (613).

7. The unlocking mechanism of a double-layer freezing rack according to claim 6, characterized in that: Insertion holes (624) are arranged on both sides of the fixed plate (609) close to the top rod (7159), and a latch (71510) which can be inserted into the insertion holes (624) is arranged on the movable block (7158).

8. The unlocking mechanism of a double-layer freezing rack according to claim 6, characterized in that: A vertically arranged sliding rod (71511) is provided at the bottom of the movable block (7158), a horizontally arranged first guide rail (7152) is provided on the movable plate (714), and the length direction of the first guide rail (7152) is perpendicular to the movable direction of the movable block (7158), a sliding frame (7151) is slidably provided on the first guide rail (7152), a pair of second sliding grooves (7155) is provided on the sliding frame (7151), and the sliding rods (71511) on both sides are respectively placed in different second sliding grooves (7155), and the sliding frame (7151) reciprocates to push the sliding rods (71511) placed on both sides of the unlocking slot (7141) to move closer to or away from each other through the second sliding grooves (7155) on both sides.

9. The unlocking mechanism of a double-layer freezing rack according to claim 8, characterized in that: A second stepping motor (7153) is mounted on the movable plate (714), and a second screw rod (7154) whose axial direction is consistent with the sliding direction of the sliding frame (7151) is arranged on the output shaft of the second stepping motor (7153), and the second screw rod (7154) is threadedly connected to the sliding frame (7151).

10. The unlocking mechanism of a double-layer freezing rack according to claim 6, characterized in that: A plurality of limiting rollers (717) are arranged around the unlocking slot (7141) for keeping the freezing rack assembly moving vertically upward or vertically downward.

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