Ice cream display cabinet door linkage cylinder device based on spiral lifting principle

Abstract

The invention relates to the technical field of display cabinets, in particular to an ice cream display cabinet door linkage cylinder device based on a spiral lifting principle, which comprises a sensing layer, a decision-making layer and an execution layer which form a sensing-decision-execution closed loop and are matched with a horizontal sliding door ice cream display cabinet; the sensing layer is used for detecting displacement and direction of a refrigerator sliding door, the decision-making layer is used for generating a control instruction according to a detection signal of the sensing layer, and the execution layer is used for executing the control instruction to drive an ice cream cylinder to lift. According to the ice cream display cabinet door body linkage cylinder device based on the spiral lifting principle, natural linkage of lifting of the door body and the cylinder is achieved, a user does not need additional operation, lifting can be triggered only by pushing and pulling the cabinet door, ice cream on the bottom layer can be lifted to the height where taking is convenient, the pain point of stooping, bending or even leaning for object taking is thoroughly solved, and the practicability is high. The use experience is greatly improved, and the device is particularly friendly to the old and the disabled.

Description

Technical Field

[0001] This invention relates to the field of display cabinet technology, and more specifically, to an ice cream display cabinet door linkage cylinder device based on the principle of spiral lifting. Background Technology

[0002] In the ice cream retail sector, horizontal sliding-door freezers are the mainstream display equipment. However, existing equipment has significant drawbacks when displaying ice cream cones. Users have to bend over, stoop, or even reach inside the freezer to retrieve items from the bottom, resulting in a poor user experience, which is particularly unfriendly to the elderly and those with mobility issues. Figure 1 The traditional ice cream bucket shown is 2.

[0003] Existing improvement solutions have many shortcomings. For example, the horizontal freezer disclosed in Chinese patent document CN220624497U requires manual operation of the lifting system, which is not linked to the door opening and closing action, increasing the number of operation steps. Purely mechanical linkage solutions transmit door movement through linkages and gears, resulting in heavy door operation, complex and easily worn transmission mechanisms, and occupying storage space. Vertical freezer lifting solutions differ greatly from horizontal freezers in door movement and load, and directly applying them would lead to complex structures, high costs, and low reliability. Summary of the Invention

[0004] The purpose of this invention is to provide an ice cream display case door linkage cylinder device based on the principle of spiral lifting, so as to solve the problems of the pure mechanical linkage scheme proposed in the background art, which transmits door movement through linkages and gears, resulting in heavy cabinet door operation, complex and easily worn transmission mechanism, and occupying storage space.

[0005] To achieve the above objectives, this invention provides an ice cream display case door linkage cylinder device based on the spiral lifting principle, comprising a sensing layer, a decision-making layer, and an execution layer, which together form a sensing-decision-execution closed loop, suitable for horizontal sliding door ice cream display cases; the sensing layer is used to detect the displacement and direction of the refrigerator sliding door, the decision-making layer is used to generate control commands based on the detection signals from the sensing layer, and the execution layer is used to execute the control commands to drive the lifting and lowering of the ice cream cylinder.

[0006] This feature creates a closed loop of perception, decision-making, and execution, enabling automatic linkage between the sliding door movement and the lifting of the ice cream cone. It is precisely adapted to horizontal sliding door ice cream display cases, solving the core pain point of inconvenient product retrieval at the bottom layer from a system level.

[0007] As a preferred embodiment of the present invention, the sensing layer is a linear displacement detection module, including a rack fixed to the sliding door and moving synchronously with the door, a pinion meshing with the rack, and a rotary encoder coaxially connected to the pinion; the axis of the pinion is rotatably connected to the inner wall of the cabinet, the pinion converts the linear motion of the rack into rotational motion, and the rotary encoder converts the rotation angle and direction into digital signals.

[0008] This setup uses a rack, pinion, and rotary encoder to convert the linear motion of the sliding door into digital signals, enabling high-precision detection of the door's displacement and direction, and providing reliable data support for subsequent lifting control.

[0009] As a preferred embodiment of the present invention, the decision layer is a microcontroller, which pre-stores a displacement-motion mapping logic control program; when a positive displacement of the refrigerator sliding door being pushed open from the closed position is detected, an ice cream cone rising command is generated; when a negative displacement of the refrigerator sliding door being pulled back closed is detected, an ice cream cone falling command is generated.

[0010] This feature relies on the microcontroller's pre-stored displacement-motion mapping logic to automatically identify door opening and closing actions and generate corresponding lifting commands, eliminating the need for additional manual operation and improving the automation level of the device.

[0011] As a preferred embodiment of the present invention, the execution layer is an electrically driven screw lifting execution mechanism, including a motor and a screw lifter. The output shaft of the motor directly drives the screw lifter to rotate, thereby realizing the lifting action of the ice cream cone.

[0012] This feature allows the motor to directly drive the screw conveyor, efficiently converting electrical commands into mechanical lifting actions, which in turn drives the ice cream cone to rise and fall stably. The power transmission is direct and energy loss is minimal.

[0013] As a preferred embodiment of the present invention, the spiral lifter includes a rotating outer shell with an angled track, a fixing mechanism, a Z-shaped track, and a limiting block; the rotating outer shell is connected to the output shaft of a motor, the Z-shaped track is disposed on the surface of the fixing mechanism, the fixing mechanism is fixed to the bottom plate of the cabinet, one end of the limiting block is connected to the bottom of the ice cream cone, and the other end is embedded in the intersection of the angled track and the Z-shaped track; when the motor drives the rotating outer shell to rotate, the angled track pushes the limiting block to make a linear lifting and lowering motion along the Z-shaped track, thereby driving the ice cream cone to lift and lower.

[0014] This setup utilizes the combination of angled and Z-shaped tracks to drive the limit block, which in turn moves the ice cream cone in a straight line, resulting in smooth operation and strong load-bearing capacity, making it suitable for heavy-duty applications.

[0015] As a preferred embodiment of the present invention, the motor is a DC geared motor, and the output shaft of the motor is equipped with a fixed shaft. The upper end of the fixed shaft is connected to the bottom central shaft of the rotating housing through a coupling. When the motor rotates forward, it drives the ice cream cylinder to rise, and when the motor rotates in reverse, it drives the ice cream cylinder to fall.

[0016] This setting features a DC geared motor connected to the rotating housing via a coupling. The forward and reverse rotation can precisely control the lifting direction of the ice cream cone, and the output torque is sufficient to meet the requirements for stable operation of the device.

[0017] As a preferred embodiment of the present invention, the rotary encoder is electrically connected to the microcontroller via a circuit. The rotary encoder outputs pulse signals in real time. The microcontroller determines the displacement direction of the refrigerator sliding door by recognizing the increase or decrease of the number of pulses, and determines whether it is a valid opening or closing action by the number of pulses. The decision layer can realize intelligent matching between the lifting height of the ice cream cone and the opening width of the refrigerator sliding door based on the opening width detected by the sensing layer.

[0018] This feature uses pulse signals to identify the door's displacement, enabling intelligent matching between the ice cream cone's lifting height and the door's opening width, thus improving the device's control precision and optimizing the user's experience in retrieving their items.

[0019] As a preferred embodiment of the present invention, the ice cream display case door linkage cylinder device based on the spiral lifting principle includes the following steps in use: S1. In the initial state, the refrigerator door is closed and the ice cream cone is located at the bottom of the refrigerator; S2. When the refrigerator door is pushed open, the sensing layer detects the positive displacement and outputs a digital signal; S3. The decision-making level receives the signal and determines it to be a valid door opening action, and generates a cylinder rising command. S4. The execution layer receives the instruction, and the motor rotates forward to drive the spiral lifter to move, raising the ice cream cone to a height that is easy to pick up. S5. After the item is retrieved, the refrigerator door is pulled back and closed. The sensing layer detects the negative displacement and outputs a digital signal. S6. The decision-making level receives the signal and determines it to be a door-closing action, and generates a cylinder descent command. S7. The execution layer receives the instruction, the motor reverses to drive the spiral lifter to move, and the ice cream cylinder returns to the bottom of the cabinet, and the motor stops running.

[0020] This setup achieves fully automated control of the device through standardized procedures, automatically raising the door when it opens and automatically resetting when it closes. The logic is clear and the operation is stable, greatly simplifying the user's operation process.

[0021] As a preferred embodiment of the present invention, a motor protective shell is provided on the outside of the motor, and the motor protective shell is fixed to the bottom plate inside the freezer to isolate the low temperature environment inside the freezer and protect the motor for stable operation.

[0022] This motor protective housing effectively isolates the low-temperature environment inside the freezer, preventing motor malfunctions due to low temperatures, ensuring long-term stable operation of the lifting system, and extending the equipment's service life.

[0023] As a preferred embodiment of the present invention, the two ends of the Z-shaped track are provided with limiting protrusions, which are adapted to the limiting block to limit the movement stroke of the limiting block and prevent over-travel displacement during the lifting and lowering of the ice cream cylinder.

[0024] This feature allows the limit protrusion to be matched with the limit block, which can limit the movement of the limit block, prevent overtravel during the lifting and lowering of the ice cream cone, avoid component collision damage, and improve the operational safety of the device.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this ice cream display cabinet door linkage cylinder device based on the spiral lifting principle, the lifting of the door and the cylinder are naturally linked. Users do not need to operate it separately. They can trigger the lifting by simply pushing and pulling the cabinet door. The ice cream at the bottom can be raised to a height that is easy to reach, which completely solves the pain points of bending over, leaning over or even reaching out to get things, greatly improving the user experience. It is especially friendly to the elderly and people with mobility difficulties.

[0026] 2. In this ice cream display case door linkage cylinder device based on the spiral lifting principle, the motor drive bears the load of the cylinder and the goods, and the sliding door only needs to overcome its own resistance, avoiding the problem of heavy cabinet door caused by pure mechanical linkage scheme, and the operation is labor-saving and smooth.

[0027] 3. In this ice cream display cabinet door linkage cylinder device based on the spiral lifting principle, the spiral lifting mechanism has a compact structure, occupies little storage space, eliminates complex linkage gear transmission, reduces mechanism wear and failure probability, improves equipment reliability, and avoids the structural redundancy and high cost problems caused by applying vertical lifting schemes.

[0028] 4. In this ice cream display case door linkage cylinder device based on the spiral lifting principle, the lifting height can be intelligently matched according to the opening range, with precise and user-friendly control, helping to enhance the product's market competitiveness. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a prior art refrigerator according to the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 This is one of the schematic diagrams of the exploded structure of the present invention; Figure 5 This is a second schematic diagram of the exploded structure of the present invention; The meanings of the labels in the diagram are as follows: 1. Refrigerator sliding door; 2. Traditional ice cream bucket; 3. Screw lifter; 4. Rack and pinion; 5. Pinion; 51. Rotary encoder; 6. Microcontroller; 7. Rotating housing; 8. Angled track; 9. Fixing mechanism; 10. Z-shaped track; 101. Limiting protrusion; 11. Ice cream cone; 12. Limiting block; 13. Coupling; 14. Fixed shaft; 15. Motor; 16. Motor protective housing. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This invention provides a linkage cylinder device for the door of an ice cream display case based on the principle of spiral lifting, such as... Figures 1-5 As shown, it includes a perception layer, a decision-making layer, and an execution layer, which together form a perception-decision-execution closed loop, suitable for horizontal sliding door ice cream display cases. The perception layer is used to detect the displacement and direction of the sliding door 1 of the freezer, the decision-making layer is used to generate control commands based on the detection signals from the perception layer, and the execution layer is used to execute the control commands to drive the ice cream cylinder 11 to rise and fall.

[0032] The perception layer, decision-making layer, and execution layer form a closed loop, realizing automatic linkage between the sliding door movement and the cylinder lifting, eliminating the need for additional manual operation. This design is precisely adapted to horizontal sliding door ice cream display cases, capable of detecting the displacement status of sliding door 1 in real time and executing lifting commands, significantly improving the convenience of retrieving items and solving the problem of difficulty in accessing products at the bottom of traditional display cases.

[0033] In this embodiment, the sensing layer is a linear displacement detection module, including a rack 4 fixed to the sliding door and moving synchronously with the door, a pinion 5 meshing with the rack 4, and a rotary encoder 51 coaxially connected to the pinion 5; the shaft of the pinion 5 is rotatably connected to the inner wall of the cabinet, the pinion 5 converts the linear motion of the rack 4 into rotational motion, and the rotary encoder 51 converts the rotation angle and direction into digital signals.

[0034] The rack 4 moves synchronously with the sliding door, converting linear motion into rotational motion through meshing with the pinion 5. The rotary encoder 51 converts the rotation angle and direction into digital signals, enabling high-precision detection of the displacement and direction of the sliding door 1. This structure provides rapid detection response, offering reliable data support for precise control of subsequent lifting and lowering actions.

[0035] Specifically, the decision-making layer is microcontroller 6, which has a pre-stored displacement-motion mapping logic control program. When a positive displacement is detected in the refrigerator sliding door 1 being pushed open from the closed position, an ice cream cone 11 is generated to rise. When a negative displacement is detected in the refrigerator sliding door 1 being pulled back to close, an ice cream cone 11 is generated to fall.

[0036] The microcontroller 6 pre-stores displacement-motion mapping logic, which can automatically generate rising or falling commands for the ice cream cone 11 based on the positive or negative displacement of the sliding door 1. This design achieves intelligent matching between door movement and cone lifting / lowering, eliminating the need for manual intervention, simplifying the operation process, and improving the automation level of the equipment.

[0037] Furthermore, the execution layer is an electrically driven screw lifting mechanism, including a motor 15 and a screw lifter 3. The output shaft of the motor 15 directly drives the screw lifter 3 to rotate, thereby realizing the lifting and lowering action of the ice cream cone 11. The screw lifter 3 includes a rotating shell 7 with an angled track 8, a fixing mechanism 9, a Z-shaped track 10, and a limiting block 12. The rotating shell 7 is connected to the output shaft of the motor 15. The Z-shaped track 10 is located on the surface of the fixing mechanism 9, which is fixed to the bottom plate of the cabinet. One end of the limiting block 12 is connected to the bottom of the ice cream cone 11, and the other end is embedded in the intersection of the angled track 8 and the Z-shaped track 10. When the motor 15 drives the rotating shell 7 to rotate, the angled track 8 pushes the limiting block 12 to make a linear lifting and lowering motion along the Z-shaped track 10, thereby driving the ice cream cone 11 to lift and lower. Motor 15 is a DC geared motor. The output shaft of motor 15 is equipped with a fixed shaft 14. The upper end of the fixed shaft 14 is connected to the bottom central shaft of the rotating housing 7 through a coupling 13. When motor 15 rotates forward, it drives the ice cream cylinder 11 to rise. When motor 15 rotates in reverse, it drives the ice cream cylinder 11 to fall.

[0038] A DC geared motor 15 directly drives the screw jack 3, and the angled track 8 of the rotating housing 7 pushes the limit block 12 to move along the Z-shaped track 10. This structure drives the ice cream cone 11 to rise and fall stably, with efficient power transmission and low loss. The screw jack operates smoothly and can effectively support the weight of the ice cream cone 11 and the product, improving the reliability of the equipment.

[0039] Furthermore, the rotary encoder 51 is electrically connected to the microcontroller 6 via a circuit. The rotary encoder 51 outputs pulse signals in real time. The microcontroller 6 determines the displacement direction of the refrigerator sliding door 1 by recognizing the increase or decrease of the number of pulses. It determines whether the door opening or closing action is valid by the number of pulses. The decision layer can realize intelligent matching between the lifting height of the ice cream cone 11 and the opening width of the refrigerator sliding door 1 based on the opening width detected by the sensing layer.

[0040] The rotary encoder 51 is electrically connected to the microcontroller 6. It determines the displacement direction of the sliding door 1 by increasing or decreasing the number of pulses, and determines the valid opening and closing action based on the number of pulses. This design can achieve intelligent matching between the lifting height of the ice cream cone 11 and the opening width of the sliding door 1, resulting in higher control precision and a more user-friendly operation for retrieving items.

[0041] Furthermore, the ice cream display case door linkage cylinder device based on the spiral lifting principle includes the following steps during use: S1: In the initial state, the refrigerator sliding door 1 is closed, and the ice cream cone 11 is located at the bottom of the refrigerator; S2: When the refrigerator sliding door 1 is pushed open, the sensing layer detects the positive displacement and outputs a digital signal; S3: The decision-making level receives the signal and determines it as a valid door opening action, and generates a cylinder rising command; S4: The execution layer receives the instruction, and the motor 15 rotates forward to drive the spiral lifter 3 to move, which lifts the ice cream cone 11 to a height that is easy to pick up. S5: After the item is retrieved, the refrigerator sliding door 1 is pulled back and closed. The sensing layer detects the negative displacement and outputs a digital signal. S6: The decision-making level receives the signal and determines it to be a door-closing action, and generates a cylinder descent command; S7: The execution layer receives the instruction, the motor 15 reverses to drive the spiral lifter 3 to move, and drives the ice cream cylinder 11 to return to the bottom of the cabinet, and the motor stops running.

[0042] The standardized steps from S1 to S7 enable fully automated control of the lifting and lowering process of the ice cream cone 11. Initially, the cone 11 is located at the bottom of the cabinet to save space; it automatically rises when the door is opened for easy retrieval; and automatically resets when the door is closed to ensure proper storage. This process has a clear logic, operates stably, and enhances the user experience.

[0043] Furthermore, a motor protective shell 16 is fitted around the outside of the motor 15. The motor protective shell 16 is fixed to the bottom plate inside the freezer to isolate the low-temperature environment inside the freezer and protect the motor 15 for stable operation.

[0044] The motor protective shell 16 is fixed to the bottom plate inside the freezer, effectively isolating it from the low-temperature environment inside the freezer. This structure prevents the motor 15 from malfunctioning due to low temperatures, extends the service life of the motor 15, and ensures the long-term stable operation of the lifting system.

[0045] Furthermore, the two ends of the Z-shaped track 10 are provided with limiting protrusions 101, which are adapted to the limiting block 12 to limit the movement of the limiting block 12 and prevent over-displacement during the lifting and lowering of the ice cream cylinder 11.

[0046] The limiting protrusions 101 at both ends of the Z-shaped track 10 are adapted to the limiting blocks 12, which can limit the movement of the limiting blocks 12. This design can prevent the ice cream cone 11 from over-traveling during the lifting process, avoid damage to components due to collision, and improve the safety of equipment operation.

[0047] Finally, it should be noted that the electronic components in the microcontroller 6 and other components mentioned above in this embodiment are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. In the idle space of this device, all the above-mentioned electrical components are connected by wires. The specific connection method should refer to the working order between the electrical components in the above working principle to complete the electrical connection. All of these are technologies known in the art.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A linkage cylinder device for the door of an ice cream display case based on the principle of spiral lifting, characterized in that: It includes a perception layer, a decision layer and an execution layer, which together form a perception-decision-execution closed loop, suitable for horizontal sliding door ice cream display cabinets; the perception layer is used to detect the displacement and direction of the sliding door (1) of the freezer, the decision layer is used to generate control commands based on the detection signals of the perception layer, and the execution layer is used to execute the control commands to drive the ice cream cylinder (11) to rise and fall.

2. The ice cream display case door linkage cylinder device based on the spiral lifting principle according to claim 1, characterized in that: The sensing layer is a linear displacement detection module, including a rack (4) fixed to the sliding door and moving synchronously with the door, a pinion (5) meshing with the rack (4), and a rotary encoder (51) coaxially connected to the pinion (5); the axis of the pinion (5) is rotatably connected to the inner wall of the cabinet, the pinion (5) converts the linear motion of the rack (4) into rotational motion, and the rotary encoder (51) converts the rotation angle and direction into digital signals.

3. The ice cream display case door linkage cylinder device based on the spiral lifting principle according to claim 2, characterized in that: The decision layer is a microcontroller (6), which has a pre-stored displacement-action mapping logic control program. When a positive displacement is detected in which the refrigerator door (1) is pushed open from the closed position, an ice cream cone (11) rise command is generated. When a negative displacement is detected in which the refrigerator door (1) is pulled back closed, an ice cream cone (11) falls command is generated.

4. The ice cream display case door linkage cylinder device based on the spiral lifting principle according to claim 1, characterized in that: The execution layer is an electrically driven spiral lifting mechanism, including a motor (15) and a spiral lifter (3). The output shaft of the motor (15) directly drives the spiral lifter (3) to rotate, thereby realizing the lifting action of the ice cream cone (11).

5. The ice cream display case door linkage cylinder device based on the spiral lifting principle according to claim 4, characterized in that: The spiral lifter (3) includes a rotating shell (7) with an angled track (8), a fixing mechanism (9), a Z-shaped track (10), and a limiting block (12). The rotating shell (7) is connected to the output shaft of the motor (15). The Z-shaped track (10) is located on the surface of the fixing mechanism (9). The fixing mechanism (9) is fixed to the bottom plate of the cabinet. One end of the limiting block (12) is connected to the bottom of the ice cream cone (11), and the other end is embedded in the intersection of the angled track (8) and the Z-shaped track (10). When the motor (15) drives the rotating shell (7) to rotate, the angled track (8) pushes the limiting block (12) to move in a straight line along the Z-shaped track (10), thereby driving the ice cream cone (11) to rise and fall.

6. The ice cream display case door linkage cylinder device based on the spiral lifting principle according to claim 5, characterized in that: The motor (15) is a DC geared motor. The output shaft of the motor (15) is equipped with a fixed shaft (14). The upper end of the fixed shaft (14) is connected to the bottom center shaft of the rotating shell (7) through a coupling (13). When the motor (15) rotates forward, it drives the ice cream cylinder (11) to rise. When the motor (15) rotates in reverse, it drives the ice cream cylinder (11) to fall.

7. The ice cream display case door linkage cylinder device based on the spiral lifting principle according to claim 3, characterized in that: The rotary encoder (51) is electrically connected to the microcontroller (6) via a line. The rotary encoder (51) outputs pulse signals in real time. The microcontroller (6) determines the displacement direction of the refrigerator sliding door (1) by recognizing the increase or decrease of the number of pulses. It determines whether the door opening or closing action is valid by the number of pulses. The decision layer can realize the intelligent matching of the lifting height of the ice cream cone (11) with the opening width of the refrigerator sliding door (1) based on the opening width detected by the sensing layer.

8. The ice cream display case door linkage cylinder device based on the spiral lifting principle according to claim 1, characterized in that: The ice cream display case door linkage cylinder device based on the spiral lifting principle includes the following steps during use: S1: In the initial state, the refrigerator sliding door (1) is closed, and the ice cream cone (11) is located at the bottom of the refrigerator; S2: When the refrigerator sliding door (1) is pushed open, the sensing layer detects the positive displacement and outputs a digital signal; S3: The decision-making level receives the signal and determines it as a valid door opening action, and generates a cylinder rising command; S4: The execution layer receives the instruction, the motor (15) rotates forward to drive the spiral lift (3) to move, and the ice cream cone (11) rises to a height that is easy to pick up; S5: After the item is retrieved, the refrigerator sliding door (1) is pulled back and closed, and the sensing layer detects the negative displacement and outputs a digital signal; S6: The decision-making level receives the signal and determines it to be a door-closing action, and generates a cylinder descent command; S7: The execution layer receives the instruction, the motor (15) reverses to drive the spiral lifter (3) to move, and drives the ice cream cylinder (11) to reset to the bottom of the cabinet, and the motor stops running.

9. The ice cream display case door linkage cylinder device based on the spiral lifting principle according to claim 7, characterized in that: The motor (15) is fitted with a motor protective shell (16) on the outside. The motor protective shell (16) is fixed to the bottom plate inside the freezer to isolate the low temperature environment inside the freezer and protect the motor (15) from running stably.

10. The ice cream display case door linkage cylinder device based on the spiral lifting principle according to claim 7, characterized in that: The Z-shaped track (10) has limiting protrusions (101) at both ends. The limiting protrusions (101) are adapted to the limiting block (12) to limit the movement of the limiting block (12) and prevent over-displacement during the lifting and lowering of the ice cream cylinder (11).

Images