Multi-link lifting device for liquid nitrogen quick freezer

Abstract

The utility model discloses a multi-link lifting device for liquid nitrogen quick freezer belongs to liquid nitrogen quick freezer supporting lifting equipment technical field, aims at solving the problem of high power source cost of existing lifting device, big maintenance difficulty, lifting synchronism is poor, control precision is insufficient and the problem of safety redundancy loss. Including support frame, connecting block, lifting column, is equipped with single motor, speed reducer and a plurality of steering gear on the support frame. Lifting column is formed by inner tube, outer tube, and the inner tube is equipped with induction ring and induction block, and the outer tube is equipped with double proximity switch in, and the lower limit ring of inner tube and the upper limit ring of outer tube form double protection. The device reduces cost and maintenance difficulty through single power source + series transmission, and double induction + mechanical limiting improves control precision and safety, and adjusts foot to adapt to complex site, and is applicable to the stable lifting of the upper and lower split type box body of liquid nitrogen quick freezer.

Description

Technical Field

[0001] This utility model relates to the technical field of lifting equipment for liquid nitrogen quick-freezing machines, specifically to a multi-linkage lifting device for liquid nitrogen quick-freezing machines. Background Technology

[0002] For ease of cleaning and maintenance, tunnel-type liquid nitrogen quick-freezing machines often adopt a split-type box structure, and their lifting devices mostly rely on hydraulic transmission or mechanical transmission methods such as "dual output shaft motor + transfer case + universal drive shaft".

[0003] The comparison document CN205547188U discloses the lifting device of a split-type liquid nitrogen tunnel refrigeration unit. Its hydraulic transmission poses a risk of oil leakage and food contamination. Furthermore, the "dual-shaft motor + transfer case" structure has the following drawbacks: 1. The dual-shaft motor design is complex, resulting in high cost and maintenance difficulty; 2. When the transfer case and universal drive shaft are engaged, transmission gaps are easily generated, leading to poor synchronization of multiple lifting columns and easy swaying of the upper unit during lifting; 3. Relying solely on a single-point proximity switch for simple pre-control lacks precise bidirectional limit switches and safety redundancy, failing to meet the lifting accuracy and safety requirements under heavy loads. Utility Model Content

[0004] To address the aforementioned technical problems, this application proposes a multi-linkage lifting device that combines a single power source, series transmission, precise sensing, and safety limit switches to overcome the shortcomings of existing technologies.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a multi-linkage lifting device for a liquid nitrogen quick-freezing machine, including a support frame, multiple connecting blocks fixedly installed on the support frame, and multiple lifting columns, each of the lifting columns being fixedly connected to the support frame through a corresponding connecting block.

[0006] The support frame is also fixedly mounted with a motor, a reducer and multiple steering gears. The output end of the motor is fixedly connected to the input end of the reducer, and the output end of the reducer is fixedly connected to the input end of one of the steering gears. Adjacent steering gears are connected by a drive shaft, with one end of the drive shaft fixedly connected to the output end of the preceding steering gear and the other end fixedly connected to the input end of the following steering gear. The output end of each steering gear is also fixedly connected to a drive shaft.

[0007] The lifting column includes an inner tube and an outer tube. The outer tube is sleeved on the outside of the inner tube and slides with the inner tube. A drive box is fixedly installed on the outer wall of the inner tube. A bevel gear is provided inside the drive box. A threaded rod is rotatably connected to the drive box. The threaded rod meshes with the bevel gear. A threaded ring is threadedly connected to the threaded rod. A connecting ring is fixedly connected to the threaded ring. The side of the connecting ring away from the threaded ring is fixedly connected to an inner push tube. The inner push tube is sleeved on the outside of the inner tube and slides with the inner tube. The top end of the inner push tube is fixedly connected to the inner wall of the outer tube. An mounting plate is fixedly connected to the outer wall of the outer tube.

[0008] An induction ring and an induction block are fixedly installed on the outer wall of the inner tube, and two proximity switches are fixedly installed on the inner wall of the outer tube, with the two proximity switches respectively corresponding to the induction ring and the induction block.

[0009] The connecting block includes a connecting plate, one side of which is provided with an arc-shaped groove adapted to the outer wall of the inner tube. The arc-shaped groove is fitted and fixed to the outer wall of the inner tube. The connecting plate is also provided with a through hole. The end of the drive shaft away from the steering gear passes through the through hole and is fixedly connected to the bevel gear in the drive box.

[0010] Preferably, the lower part of the outer wall of the inner tube is threaded with an adjusting foot, the lower part of the inner wall of the outer tube is fixedly connected with a lower limiting ring, the upper part of the outer wall of the inner tube is fixedly connected with an upper limiting ring, the lower limiting ring is located below the upper limiting ring, and the top of the outer tube is fixedly connected with an outer cover.

[0011] Preferably, the drive box is fixedly installed at the middle position of the outer wall of the inner tube, the inner wall of the inner push tube is in close contact with the outer wall of the inner tube, and the axial length of the inner push tube is not less than the maximum lifting stroke of the outer tube.

[0012] Preferably, the proximity switches are an upper proximity switch and a lower proximity switch. The upper proximity switch is located on the upper part of the inner wall of the outer tube and is used to sense the sensing block to control the maximum rising height of the lifting column. The lower proximity switch is located on the lower part of the inner wall of the outer tube and is used to sense the sensing ring to control the maximum falling height of the lifting column.

[0013] Preferably, the connecting block further includes a second connecting plate and a third connecting plate. The side of the first connecting plate away from the inner tube is fixedly connected to one side of the second connecting plate. The other side of the second connecting plate is fixedly connected to one side of the third connecting plate. The other side of the third connecting plate is fixedly connected to the support frame.

[0014] Preferably, the number of steering gears is the same as the number of rising columns, and the drive shaft corresponding to each steering gear is connected to the drive box of one of the rising columns.

[0015] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0016] 1. By replacing the "transfer drive + universal joint drive shaft" with a "single motor + steering gear drive shaft in series", the cost and maintenance difficulty are reduced, while the synchronization of multiple rising bollards is improved.

[0017] 2. The lifting stroke is precisely controlled in both directions by using "dual proximity switches + induction ring / block", which, together with mechanical limit switches, forms a safety redundancy.

[0018] 3. The ground flatness can be adjusted by adjusting the feet, and the arc-shaped groove design of the connecting block ensures stable installation of the lifting column, making it suitable for different site conditions. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 for Figure 1 Enlarged view of the local structure at point A;

[0021] Figure 3 This is a schematic diagram of the connecting block of this utility model;

[0022] Figure 4 This is a schematic diagram of the inner tube structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the connecting plate three of this utility model;

[0024] Figure 6 This is a cross-sectional view of the lifting column of this utility model;

[0025] Figure 7 for Figure 6 Enlarged view of the local structure at point B;

[0026] In the diagram: 101, Motor; 102, Reducer; 103, Support frame; 104, Steering gear; 105, Drive shaft; 106, Connecting block; 107, Lifting column; 108, Transmission shaft; 1061, Connecting plate one; 1062, Connecting plate two; 1063, Connecting plate three; 1071, Inner tube; 1072, Outer tube; 1073, Mounting plate; 1074, Drive box; 1075, Threaded rod; 1076, Threaded ring; 1077, Connecting ring; 1078, Inner push tube; 1079, Upper limit ring; 10710, Lower limit ring; 10711, Outer cover; 10712, Sensing ring; 10713, Adjusting foot. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0029] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] A multi-linkage lifting device for a liquid nitrogen quick-freezing machine includes a support frame 103, multiple connecting blocks 106 fixedly installed on the support frame 103, and multiple lifting columns 107. Each lifting column 107 is fixedly connected to the support frame 103 through a corresponding connecting block 106.

[0031] Specifically, the support frame 103 serves as the mounting base for the entire device and is made of stainless steel to ensure structural strength. Connecting blocks 106 are bolted to the support frame 103, with each connecting block 106 corresponding to a lifting column 107. The arc-shaped groove on the connecting plate 1061 of the connecting block 106 fits against the outer wall of the inner tube 1071 and is further secured by welding or bolts to ensure stable installation of the lifting column 107. The through hole on the connecting plate 1061 is used to avoid the drive shaft 105, and the inner wall of the through hole is equipped with a wear-resistant bushing to reduce wear on the drive shaft 105 during rotation and ensure transmission accuracy.

[0032] The support frame 103 is also fixedly mounted with a motor 101, a reducer 102 and a plurality of steering gears 104. The output end of the motor 101 is fixedly connected to the input end of the reducer 102. The output end of the reducer 102 is fixedly connected to the input end of one of the steering gears 104. Adjacent steering gears 104 are connected by a drive shaft 108. One end of the drive shaft 108 is fixedly connected to the output end of the previous steering gear 104 and the other end is fixedly connected to the input end of the next steering gear 104. The output end of each steering gear 104 is also fixedly connected to a drive shaft 105.

[0033] Specifically, motor 101 is a single-phase asynchronous motor with a power of 0.75kW and a speed of 1450r / min. It is connected to the input end of reducer 102 with a reduction ratio of 1:50 via a coupling. The output end of reducer 102 is fixed to the input end of the first steering gear 104 via a key connection. Steering gear 104 is a 90° bevel gear steering gear. Adjacent steering gears 104 are connected via drive shaft 108. Both ends of drive shaft 108 are respectively connected to steering gear 104 via splines to ensure backlash-free power transmission. The output end of each steering gear 104 is also fixed to drive shaft 105 via a key connection. The other end of drive shaft 105 passes through drive housing 1074 and is fixed to the internal bevel gear.

[0034] The lifting column 107 includes an inner tube 1071 and an outer tube 1072. The outer tube 1072 is sleeved on the outside of the inner tube 1071 and slides in cooperation with the inner tube 1071. A drive box 1074 is fixedly installed on the outer wall of the inner tube 1071. A bevel gear is provided inside the drive box 1074. A threaded rod 1075 is rotatably connected to the drive box 1074. The threaded rod 1075 meshes with the bevel gear. A threaded connection is threaded onto the threaded rod 1075. A threaded ring 1076 is provided, and a connecting ring 1077 is fixedly connected to the threaded ring 1076. The side of the connecting ring 1077 away from the threaded ring 1076 is fixedly connected to an inner push tube 1078. The inner push tube 1078 is sleeved on the outside of the inner tube 1071 and slides in cooperation with the inner tube 1071. The top end of the inner push tube 1078 is fixedly connected to the inner wall of the outer tube 1072. A mounting plate 1073 is fixedly connected to the outer wall of the outer tube 1072. The mounting plate 1073 is used to connect the outer tube 1072 to the upper body of the quick-freezing machine and directly transmits the lifting action.

[0035] Specifically, the inner tube 1071 is a hollow steel tube, and the outer tube 1072 is sleeved on the outside of the inner tube 1071. The two are fitted together with a gap to form a sleeve-type lifting body, ensuring that the outer tube 1072 can slide smoothly along the inner tube 1071.

[0036] The drive box 1074 is welded to the middle of the outer wall of the inner tube 1071. It has two meshing bevel gears inside. One bevel gear is fixed to the drive shaft 105, and the other bevel gear is fixed to the threaded rod 1075. The bevel gear in the drive box 1074 realizes the secondary conversion of the power direction, converting the lateral power of the drive shaft 105 into the vertical power of the threaded rod 1075.

[0037] The threaded rod 1075 is rotatably connected to the drive box 1074 via a deep groove ball bearing. A retaining ring is provided at its top to prevent the threaded ring 1076 from dislodging. The threaded ring 1076 is threadedly engaged with the threaded rod 1075. The connecting ring 1077 is fixed to the threaded ring 1076 and the inner push tube 1078 by bolts. The inner push tube 1078 is sleeved on the outside of the inner tube 1071, and its top end is welded to the inner wall of the outer tube 1072, thus realizing the transmission process of "threaded rod rotation → threaded ring lifting → inner push tube driving outer tube lifting".

[0038] An induction ring 10712 and an induction block are fixedly installed on the outer wall of the inner tube 1071. Two proximity switches are fixedly installed on the inner wall of the outer tube 1072, and the two proximity switches are respectively configured to correspond to the induction ring 10712 and the induction block.

[0039] Specifically, the sensing ring 10712 is a ring-shaped metal sheet welded to the lower part of the outer wall of the inner tube 1071; the sensing block is a cuboid metal block welded to the upper part of the outer wall of the inner tube 1071. Two proximity switches, model E2EX10D1N, are fixed to the inner wall of the outer tube 1072 via brackets. The upper proximity switch corresponds to the position of the sensing block, and the lower proximity switch corresponds to the position of the sensing ring 10712. The proximity switches trigger signals by sensing the corresponding components to control the start and stop of the motor 101, preventing excessive raising and lowering of the outer tube 1072.

[0040] The connecting block 106 includes a connecting plate 1061. One side of the connecting plate 1061 is provided with an arc-shaped groove that is adapted to the outer wall of the inner tube 1071. The arc-shaped groove is fitted and fixed to the outer wall of the inner tube 1071. The connecting plate 1061 is also provided with a through hole. The end of the drive shaft 105 away from the steering gear 104 passes through the through hole and is fixedly connected to the bevel gear in the drive box 1074.

[0041] The arc-shaped groove on the connecting plate 1061 of the connecting block 106 fits tightly against the outer wall of the inner tube 1071, improving the stability of the fixation; the through hole on the connecting plate 1061 allows the drive shaft 105 to pass through, which can reduce the wear of the drive shaft 105 when it rotates and ensure the accuracy of power transmission.

[0042] The lower part of the outer wall of the inner tube 1071 is threaded with an adjusting foot 10713. The lower part of the inner wall of the outer tube 1072 is fixedly connected with a lower limiting ring 10710. The upper part of the outer wall of the inner tube 1071 is fixedly connected with an upper limiting ring 1079. The lower limiting ring 10710 is located below the upper limiting ring 1079. The top end of the outer tube 1072 is fixedly connected with an outer cover 10711.

[0043] The adjusting foot 10713 at the lower part of the outer wall of the inner tube 1071 is a cylindrical metal block with external threads. It is connected to the inner tube 1071 by threads. Rotating the adjusting foot 10713 can adjust its extension length to adapt to uneven installation ground and ensure the overall level of the device. The lower limit ring 10710 on the inner wall of the outer tube 1072 and the upper limit ring 1079 on the outer wall of the inner tube 1071 are both annular steel plates. The distance between them is equal to the maximum lifting stroke of the outer tube 1072. When the outer tube 1072 is lifted to the limit position, the limit rings abut against each other to achieve mechanical limit and avoid excessive lifting caused by proximity switch failure. The outer cover 10711 is made of plastic and is connected to the top of the outer tube 1072 by threads to prevent dust and impurities from entering the gap between the inner tube 1071 and the outer tube 1072 and affecting the sliding performance.

[0044] The drive box 1074 is fixedly installed at the middle position of the outer wall of the inner tube 1071. The inner wall of the inner push tube 1078 is closely fitted with the outer wall of the inner tube 1071. The axial length of the inner push tube 1078 is not less than the maximum lifting stroke of the outer tube 1072.

[0045] The drive box 1074 is fixed to the middle of the outer wall of the inner tube 1071, aligning the power transmission center with the center of gravity of the lifting column 107. This prevents the inner tube 1071 from bending due to force offset and enhances structural stability under heavy loads. The inner wall of the inner push tube 1078 fits tightly with the outer wall of the inner tube 1071, eliminating gaps to improve guiding accuracy and further reducing radial sway during the lifting of the outer tube 1072. The axial length of the inner push tube 1078 is not less than the maximum lifting stroke of the outer tube 1072, ensuring that the inner push tube 1078 remains in contact with the inner tube 1071 throughout the entire stroke range of the outer tube 1072, preventing disengagement and ensuring the continuity of the lifting action.

[0046] The proximity switches are an upper proximity switch and a lower proximity switch. The upper proximity switch is located on the upper part of the inner wall of the outer tube 1072 and is used to sense the sensing block to control the maximum rising height of the lifting column 107. The lower proximity switch is located on the lower part of the inner wall of the outer tube 1072 and is used to sense the sensing ring 10712 to control the maximum falling height of the lifting column 107.

[0047] The upper proximity switch corresponds to the position of the sensing block. When the outer tube rises, the sensing block approaches the upper proximity switch, triggering a signal. The lower proximity switch corresponds to the position of the sensing ring 10712. When the outer tube descends, the sensing ring 10712 approaches the lower proximity switch, triggering a signal. The proximity switches are connected to the external control system PLC (model S7200SMART) via wires to control the start and stop of motor 101. This division of labor design ensures precise bidirectional control of the lifting stroke, avoiding control errors caused by ambiguity in the function of the sensing components.

[0048] The connecting block 106 further includes a second connecting plate 1062 and a third connecting plate 1063. The side of the first connecting plate 1061 away from the inner tube 1071 is fixedly connected to one side of the second connecting plate 1062. The other side of the second connecting plate 1062 is fixedly connected to one side of the third connecting plate 1063. The other side of the third connecting plate 1063 is fixedly connected to the support frame 103.

[0049] The newly added connecting plates 1062 and 1063 in the connecting block 106 are connected sequentially with connecting plate 1061 to form a multi-level structure. Compared with a single connecting plate, this significantly improves the overall strength, can withstand greater bending moments, and avoids connection breakage due to heavy load on the lifting column 107. The multi-level plate structure can be adjusted in size according to the specific shape of the support frame 103, improving the adaptability of the device to different support frames 103 and simplifying the installation process.

[0050] The number of steering gears 104 is the same as the number of lifting columns 107, and the drive shaft 105 corresponding to each steering gear 104 is connected to a drive box 1074 of a lifting column 107.

[0051] The number of steering gears 104 is the same as the number of lifting columns 107, and the drive shaft 105 of each steering gear 104 is connected to the drive box 1074 of one lifting column 107, ensuring that each lifting column 107 can obtain independent and balanced power input. This design avoids the problem of uneven power distribution in traditional multi-output systems, ensures that all lifting columns 107 move synchronously, and reduces the shaking of the machine body when it is raised or lowered.

[0052] Working principle:

[0053] The motor 101 is started, and the power output by the motor 101 is reduced by the reducer 102 and then transmitted to the first steering gear 104. The steering gear 104 changes the direction of the power by 90°. Part of the power is transmitted to the drive box 1074 of the corresponding lifting column 107 through the drive shaft 105, and the other part is transmitted to the next steering gear 104 through the transmission shaft 108, so as to realize the power input of all lifting columns 107 in sequence. The bevel gear in the drive box 1074 drives the threaded rod 1075 to rotate, and the threaded ring 1076 moves axially along the threaded rod 1075. Through the connecting ring 1077, the inner push tube 1078 and the outer tube 1072 are driven to rise and fall synchronously. The mounting plate 1073 on the outer tube 1072 is connected to the upper body of the liquid nitrogen quick-freezing machine by bolts, so as to realize the raising and lowering of the upper body.

[0054] When the outer tube 1072 rises, the upper proximity switch on the inner wall of the outer tube 1072 gradually approaches the sensing block on the inner tube 1071. When the distance between the two is less than 5mm, the proximity switch sends a signal to the PLC, and the PLC controls the motor 101 to stop, preventing the outer tube 1072 from rising excessively. When the outer tube 1072 falls, the lower proximity switch gradually approaches the sensing ring 10712. When the distance is less than 5mm, the motor 101 stops, preventing excessive falling. If the proximity switch fails, the outer tube 1072 continues to rise and fall. At this time, the lower limit ring 10710 on the inner wall of the outer tube 1072 will abut against the upper limit ring 1079 on the outer wall of the inner tube 1071, forcibly stopping the movement of the outer tube 1072 through mechanical limiting, preventing structural damage. In addition, the adjusting foot 10713 can adjust the extension length according to the flatness of the installation ground to ensure that the support frame 103 is horizontal and to prevent the lifting column 107 from getting stuck due to tilting.

[0055] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multi-linkage lifting device for a liquid nitrogen quick-freezing machine, characterized in that: It includes a support frame (103), a plurality of connecting blocks (106) fixedly installed on the support frame (103), and a plurality of lifting columns (107), each of the lifting columns (107) being fixedly connected to the support frame (103) through a corresponding connecting block (106); The support frame (103) is also fixedly mounted with a motor (101), a reducer (102) and a plurality of steering gears (104). The output end of the motor (101) is fixedly connected to the input end of the reducer (102). The output end of the reducer (102) is fixedly connected to the input end of one of the steering gears (104). Adjacent steering gears (104) are connected by a drive shaft (108). One end of the drive shaft (108) is fixedly connected to the output end of the previous steering gear (104) and the other end is fixedly connected to the input end of the next steering gear (104). The output end of each steering gear (104) is also fixedly connected to a drive shaft (105). The lifting column (107) includes an inner tube (1071) and an outer tube (1072). The outer tube (1072) is sleeved on the outside of the inner tube (1071) and slides in cooperation with the inner tube (1071). A drive box (1074) is fixedly installed on the outer wall of the inner tube (1071). A bevel gear is provided inside the drive box (1074). A threaded rod (1075) is rotatably connected to the drive box (1074). The threaded rod (1075) meshes with the bevel gear. A threaded connection is threaded onto the threaded rod (1075). A threaded ring (1076) is provided, and a connecting ring (1077) is fixedly connected to the threaded ring (1076). The side of the connecting ring (1077) away from the threaded ring (1076) is fixedly connected to the inner push tube (1078). The inner push tube (1078) is sleeved on the outside of the inner tube (1071) and slides with the inner tube (1071). The top end of the inner push tube (1078) is fixedly connected to the inner wall of the outer tube (1072). An mounting plate (1073) is fixedly connected to the outer wall of the outer tube (1072). An induction ring (10712) and an induction block are fixedly installed on the outer wall of the inner tube (1071), and two proximity switches are fixedly installed on the inner wall of the outer tube (1072). The two proximity switches are respectively connected to the induction ring and the induction block. The induction ring (10712) and induction block are configured accordingly; The connecting block (106) includes a connecting plate (1061). One side of the connecting plate (1061) is provided with an arc-shaped groove that is adapted to the outer wall of the inner tube (1071). The arc-shaped groove is fitted and fixed to the outer wall of the inner tube (1071). The connecting plate (1061) is also provided with a through hole. The end of the drive shaft (105) away from the steering gear (104) passes through the through hole and is fixedly connected to the bevel gear in the drive box (1074).

2. The multi-linkage lifting device for liquid nitrogen quick-freezing machine according to claim 1, characterized in that: The lower part of the outer wall of the inner tube (1071) is threaded with an adjusting foot (10713), the lower part of the inner wall of the outer tube (1072) is fixedly connected with a lower limiting ring (10710), the upper part of the outer wall of the inner tube (1071) is fixedly connected with an upper limiting ring (1079), the lower limiting ring (10710) is located below the upper limiting ring (1079), and the top end of the outer tube (1072) is fixedly connected with an outer cover (10711).

3. The multi-linkage lifting device for liquid nitrogen quick-freezing machine according to claim 1, characterized in that: The drive box (1074) is fixedly installed at the middle position of the outer wall of the inner tube (1071). The inner wall of the inner push tube (1078) is closely fitted with the outer wall of the inner tube (1071). The axial length of the inner push tube (1078) is not less than the maximum lifting stroke of the outer tube (1072).

4. The multi-linkage lifting device for a liquid nitrogen quick-freezing machine according to claim 1, characterized in that: The proximity switches are an upper proximity switch and a lower proximity switch. The upper proximity switch is located on the upper part of the inner wall of the outer tube (1072) and is used to sense the sensing block to control the maximum rising height of the lifting column (107). The lower proximity switch is located on the lower part of the inner wall of the outer tube (1072) and is used to sense the sensing ring (10712) to control the maximum falling height of the lifting column (107).

5. The multi-linkage lifting device for a liquid nitrogen quick-freezing machine according to claim 1, characterized in that: The connecting block (106) further includes a second connecting plate (1062) and a third connecting plate (1063). The side of the first connecting plate (1061) away from the inner tube (1071) is fixedly connected to one side of the second connecting plate (1062). Then, the other side of the connecting plate two (1062) is fixedly connected to one side of the connecting plate three (1063), and the other side of the connecting plate three (1063) is fixedly connected to the support frame (103).

6. The multi-linkage lifting device for a liquid nitrogen quick-freezing machine according to claim 1, characterized in that: The number of steering gears (104) is the same as the number of lifting columns (107), and the drive shaft (105) corresponding to each steering gear (104) is connected to the drive box (1074) of one of the lifting columns (107).

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