Evaporator structure for making crushed ice

Abstract

The application discloses an evaporator structure for manufacturing broken ice, and relates to the technical field of refrigeration, which comprises an outer cylinder, the inside of the outer cylinder is provided with an inner cylinder, the inside of the inner cylinder is provided with a spiral push rod for transporting ice blocks, the inside of the inner cylinder is provided with an ice outlet forming cutter, the top surface of the outer cylinder is provided with an ice outlet frame, the top surface of the ice outlet forming cutter is fixedly provided with a stirring claw, the inside of the ice outlet frame is provided with an auxiliary mechanism for preventing ice blocks from accumulating, and the output end of the auxiliary mechanism is provided with a pressing plate for extruding ice blocks. The application utilizes the continuous reciprocating movement of the pressing plate in the inside of the ice outlet frame to actively destroy the arch-shaped structure formed by the broken ice, effectively prevents blockage, ensures that the ice outlet process is extremely smooth, greatly improves the operation reliability of the equipment, continuously flattens the top of the conical ice pile, uniformly distributes the broken ice, fully utilizes the entire volume of the ice storage barrel, improves the actual ice storage capacity to close to the theoretical maximum value, and significantly prolongs the ice supply time after single ice making.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and in particular to an evaporator structure for manufacturing crushed ice. Background Technology

[0002] An evaporator is a heat exchanger that uses a low-pressure, low-temperature refrigerant liquid to absorb heat from the medium being cooled during boiling, thereby achieving refrigeration. Evaporators are widely used in ice-making. An evaporator contains a circumferentially rotating shaft and scrapers, with the scrapers connected to the shaft. Driven by a reducer, the evaporator shaft rotates slowly upwards. Water enters from the inlet at the bottom of the evaporator and forms a water film on the scrapers. This water film exchanges heat with the refrigerant in the refrigerant channels, rapidly lowering the temperature and forming liquid ice. Under the pushing and squeezing action of the scrapers, the ice is finally produced from the ice outlet at the top of the evaporator.

[0003] Traditional ice makers typically crush the ice produced at the evaporator and directly feed it into the ice storage tank. Due to the poor flowability of crushed ice (especially flake ice), during the transportation process, the crushed ice naturally accumulates and forms a cone-shaped structure with a high center and low edges. This can easily lead to "bridging" and blockage, which not only wastes ice storage space, making the actual ice storage volume far lower than the theoretical value, but also easily causes the full ice sensor based on fixed-point detection to be triggered prematurely, resulting in interruption of ice dispensing and even equipment failure. Utility Model Content

[0004] To improve the problem of "bridging" and blockage caused by crushed ice, this application provides an evaporator structure for manufacturing crushed ice.

[0005] The evaporator structure for manufacturing crushed ice provided in this application adopts the following technical solution:

[0006] An evaporator structure for manufacturing crushed ice includes an outer cylinder, an inner cylinder inside the outer cylinder, a spiral pusher for transporting ice blocks inside the inner cylinder, an ice-forming cutter inside the inner cylinder, an ice-discharging frame on the top surface of the outer cylinder, a stirring claw fixedly mounted on the top surface of the ice-discharging cutter, an auxiliary mechanism for preventing ice block accumulation inside the ice-discharging frame, and a pressure plate for squeezing ice blocks at the output end of the auxiliary mechanism.

[0007] By adopting the above technical solution, the outer cylinder provides external support and protection for the entire evaporator structure, forming a sealed jacketed evaporator cavity with the inner cylinder, providing space for refrigerant flow and evaporation. The spiral pusher is the core ice conveying and scraping component. Its rotational motion scrapes off the ice layer frozen on the inner wall of the inner cylinder, and on the other hand, it continuously conveys crushed ice upwards through the spiral blades, realizing automated ice discharge. The ice forming cutter is used to finally crush and shape the ice blocks conveyed by the spiral pusher, cutting them into uniform and small-sized crushed ice, which determines the final ice discharge. In its form, the ice outlet frame serves as the final channel for discharging crushed ice, connecting the ice-making body (inner and outer cylinders) with the external ice storage equipment. It guides the crushed ice into the ice storage tank. The stirring claws break up and agitate the crushed ice in the final stage of ice discharging to prevent it from re-adheding and clumping due to moisture, ensuring that the ice is loose, dry, and has good fluidity. The auxiliary mechanism drives the pressure plate to perform specific actions, actively clearing the ice blocks in the ice outlet frame to prevent blockage ("ice bridge" phenomenon), and optimizing the ice storage space by squeezing and flattening the ice pile in the ice storage tank. The pressure plate is used to squeeze the ice blocks to prevent them from accumulating in the ice outlet frame.

[0008] Preferably, a fixing plate is fixedly connected to one side of the ice outlet frame, and the auxiliary mechanism includes a fixing frame 1, which is symmetrically fixed on both sides of the fixing plate, and a motor is fixedly installed inside the fixing frame 1.

[0009] By adopting the above technical solution, the fixed plate serves as the mounting base and load-bearing structure of the entire auxiliary mechanism, providing stable support. The symmetrical fixed frame is used to ensure the force balance of the mechanism, and the motor serves as the core power source, providing driving force for the entire auxiliary mechanism.

[0010] Preferably, a protective frame is fixedly provided on one side of the ice outlet frame, and a rotating shaft fixedly provided to the motor is rotatably provided through the protective frame. A fixing block is provided inside the ice outlet frame.

[0011] By adopting the above technical solution, the protective frame 1 forms a sealed space, protecting the internal transmission components from ice, snow, moisture and foreign objects. The rotating shaft 1 is used to transmit the power of the motor from inside the protective frame 1 to the outside, and is the key shaft for power transmission. The fixed block serves as the fixed end support of the reciprocating screw, ensuring that it is installed firmly and will not produce axial movement when rotating.

[0012] Preferably, the fixed block is rotatably provided with a reciprocating lead screw fixedly disposed with the rotating shaft, the outer surface of the reciprocating lead screw is symmetrically provided with sliders, a connecting rod is rotatably provided on one side of the slider, and an auxiliary frame is rotatably provided on one side of the connecting rod.

[0013] By adopting the above technical solution, the reciprocating lead screw is used to convert the rotational motion transmitted from the motor into precise, periodic linear reciprocating motion, the slider is used to convert the rotational motion of the reciprocating lead screw into its own linear motion, and the connecting rod is used to transmit the linear motion of the slider to the auxiliary frame, and allow the auxiliary frame to have a certain degree of freedom of movement when moving up and down, so as to avoid jamming.

[0014] Preferably, a connecting device is provided between the fixing block and the auxiliary frame.

[0015] By adopting the above technical solution, the connecting device is used to establish a connection between the fixed block and the moving auxiliary frame, guide and constrain the movement of the auxiliary frame, and prevent it from shaking.

[0016] Preferably, the connecting device includes a fixed cylinder fixedly disposed on one side of the fixed block, a sliding column fixedly disposed on one side of the auxiliary frame, and a return spring fixedly disposed between the fixed cylinder and the sliding column.

[0017] By adopting the above technical solution, the fixed cylinder and the sliding column cooperate to provide precise linear guidance for the up and down movement of the auxiliary frame, while the reset spring plays a buffering role: when the pressure plate has too much downward resistance (such as when it is full of ice), the spring is compressed, which can protect the motor, and its compression amount can also serve as a signal to judge the full ice state.

[0018] Preferably, a bevel gear set is rotatably provided inside the protective frame, and a rotating column rotatably provided inside the protective frame is fixed on one side of the bevel gear set.

[0019] By adopting the above technical solution, the bevel gear set is used to change the power transmission direction by 90 degrees (from horizontal to vertical), and the rotating column is responsible for transmitting the power downward.

[0020] Preferably, a protective frame two is fixedly provided on one side of the auxiliary frame, and a bevel gear set two is rotatably provided inside the protective frame two and slidably provided with the rotating column. A rotating shaft two is fixedly provided on one side of the bevel gear set two and rotatably provided inside the bevel gear set two, and the rotating shaft two is connected to the pressure plate for transmission.

[0021] By adopting the above technical solution, the second protective frame is used to protect the internal gears, and the second bevel gear set is slidably connected to the rotating column to ensure that while receiving the rotational power from the rotating column, it can adapt to the up and down movement of the auxiliary frame. The second bevel gear set converts the vertical rotational power back into the horizontal direction and drives the pressure plate to rotate through the second rotating shaft. Finally, the pressure plate moves up and down under the drive of the auxiliary frame, while it can also rotate around the horizontal axis, forming a compound motion.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. By using the pressure plate to perform continuous reciprocating motion inside the ice dispensing frame, the arched structure formed by crushed ice can be actively broken, effectively preventing blockage and ensuring an extremely smooth ice dispensing process. This greatly improves the operational reliability of the equipment and can continuously flatten the top of the conical ice pile, making the crushed ice evenly distributed. This fully utilizes the entire volume of the ice storage tank, increasing the actual ice storage capacity to close to the theoretical maximum value and significantly extending the ice supply time after a single ice-making operation.

[0024] 2. As the pressure plate moves up and down, it exerts a certain amount of pressure and grinding effect on the ice fragments in the ice outlet channel. This can perform a secondary crushing of a small number of large ice blocks that have not been completely crushed by the ice crushing shaft, resulting in more uniform and regular ice fragments in the final output, thus improving the quality of the final ice product. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this application;

[0026] Figure 2 This is a partial exploded view of the structure in this application;

[0027] Figure 3 This is a schematic diagram of the internal structure of the ice outlet frame in this application;

[0028] Figure 4 This is a schematic diagram of the internal structure of the fixed frame in this application;

[0029] Figure 5 This is a schematic diagram of the internal structure of the fixed cylinder in this application.

[0030] Attached reference numerals: 1. Outer cylinder; 2. Inner cylinder; 3. Spiral pusher; 4. Ice forming cutter; 5. Stirring claw; 6. Ice ejector frame; 7. Fixing plate;

[0031] 8. Auxiliary mechanism; 81. Fixed frame 1; 82. Motor; 83. Protective frame 1; 84. Fixing block; 85. Rotating shaft 1; 86. Reciprocating lead screw; 87. Slider; 88. Connecting rod; 89. Auxiliary frame;

[0032] 810. Bevel gear set one; 811. Rotating column; 812. Protective frame two; 813. Bevel gear set two; 814. Rotating shaft two; 815. Fixed cylinder; 816. Sliding column; 817. Return spring;

[0033] 9. Pressure plate. Detailed Implementation

[0034] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0035] This application discloses an evaporator structure for manufacturing crushed ice.

[0036] Reference Figure 1 , Figure 2 An evaporator structure for manufacturing crushed ice includes an outer cylinder 1. An insulation sleeve, made of polyurethane foam and integrally formed with the outer cylinder 1, can be fitted onto the outer surface of the outer cylinder 1 to provide insulation and prevent condensation. A refrigerant outlet pipe and a refrigerant inlet pipe are connected tangentially to the upper and lower ends of the outer cylinder 1, respectively. The refrigerant inlet pipe is connected to the lower end of the outer cylinder 1, and the refrigerant outlet pipe is connected to the upper end of the outer cylinder 1. The refrigerant inlet pipe and the refrigerant outlet pipe are positioned opposite each other on the circle of the outer cylinder 1. The interior of the outer cylinder 1 is equipped with a connection to the outer cylinder. The inner cylinder 2 is closed at both ends of the outer cylinder 1, and a fixing ring is fitted on the outer surface of the outer cylinder 1. Both the outer cylinder 1 and the inner cylinder 2 are made of food-grade 304 stainless steel seamless tubes. The bottom end of the inner cylinder 2 is connected to a water inlet pipe and a drain pipe for water intake for ice making and drainage during system shutdown, maintenance and cleaning. An ice outlet hole is formed at the top of the inner cylinder 2. In specific implementation, a spiral cross mesh can also be set inside the inner cylinder 2 to increase the friction of the pipe wall. The cross angle of the spiral cross mesh can be designed within the range of 60° according to the ice making capacity.

[0037] An outer cylinder 1 and an inner cylinder 2 form a closed jacketed evaporator cavity. The top and bottom of the outer cylinder 1 each form a constricted section, the inner diameter of which is larger than the outer diameter of the inner cylinder 2. The constricted sections of the inner cylinder 2 and the outer cylinder 1 are welded together to form a closed sleeve structure. A spiral push rod 3 is rotatably connected to the inner wall of the inner cylinder 2. The gap between the outer diameter of the spiral push rod 3 and the inner diameter of the inner cylinder 2 does not exceed 1 mm. The spiral push rod 3 is used to transport ice blocks. Ventilation pipes and vents can be provided at the center and side walls of the spiral push rod 3 to expel air mixed in during compression, ensuring the quality of the ice blocks. A food-grade silicone sealing ring can also be provided at the bottom of the spiral push rod 3 to seal the spiral push rod 3 and the outer cylinder 1. The sealing ring's temperature resistance range should cover temperature changes from -30℃ to +70℃ to ensure a tight seal during long-term use. The effect is to prevent the ice-making water in the evaporator from flowing out from the bottom. The sealing element includes a stationary ring fixed inside the outer cylinder 1 and a rotating ring rotatably disposed inside the stationary ring. The bottom end of the spiral push rod 3 passes through and is fixed inside the rotating ring. A sealing surface is provided between the stationary ring and the rotating ring to form a sliding seal. An ice-forming cutter 4 is fixedly connected to the inside of the inner cylinder 2 by bolts. The ice-forming cutter 4 includes several blades, and a guide channel is formed between every two blades. An ice-discharging frame 6 with an inclined surface is fixedly connected to the top surface of the outer cylinder 1. An agitator 5 is fixedly connected to the top surface of the ice-discharging cutter 4 by bolts, and the agitator 5 is located inside the ice-discharging frame 6. An auxiliary mechanism 8 for preventing ice accumulation is provided inside the ice-discharging frame 6. A pressure plate 9 for squeezing ice is provided at the output end of the auxiliary mechanism 8.

[0038] During use, the refrigerant enters the cavity between the outer cylinder 1 and the inner cylinder 2 through the refrigerant inlet pipe, vaporizes and absorbs heat to cool the water in the outer cylinder 1, reaching the freezing point and condensing into ice. The reducer drives the spiral push rod 3 to rotate, and the spiral push rod 3 continuously scrapes the frozen ice crystals off the inner wall of the outer cylinder 1. The ice crystals are pushed and compacted upwards by the spiral push rod 3, and then further compacted by the ice forming cutter 4. The ice crystals are then guided through the ice outlet through the guide channel and further compacted into dense mineral-shaped ice columns. The ice columns are then continuously pushed to the stirring claw 5, where they are broken into ice blocks and continuously fall into the ice storage tank of the ice maker through the ice outlet frame 6.

[0039] Reference Figure 3 , Figure 4 A fixed plate 7 is fixedly connected to one side of the ice outlet frame 6. Auxiliary mechanisms 8 are symmetrically arranged on both sides of the fixed plate 7. Each auxiliary mechanism 8 includes a fixed frame 81, which is symmetrically fixedly connected to both sides of the fixed plate 7. The interior of the fixed frame 81 is hollow, and the inner wall of the fixed frame 81 is fixedly connected to the housing of the motor 82. A hollow protective frame 83 is fixedly connected to one side of the ice outlet frame 6. A rotating shaft 85 is rotatably connected through the inner wall of the protective frame 83, and the rotating shaft 85 is fixedly connected to the output shaft of the motor 82. The inner wall of the ice outlet frame 6 is fixedly connected to two fixed blocks 84. The two fixed blocks 84 are rotatably connected to a reciprocating screw 86. The reciprocating screw 86 is fixedly connected to a rotating shaft 85. A limiting plate is fixed at the center of the reciprocating screw 86. The outer surface of the reciprocating screw 86 is symmetrically connected to a slider 87 with internal ball bearings and a reversing device. The bottom of the arc surface of the slider 87 is rotatably connected to a connecting rod 88. One side of the connecting rod 88 is rotatably connected to an auxiliary frame 89. The auxiliary frame 89 is located on the side away from the slider 87.

[0040] In use, the motor 82 drives the rotating shaft 85 to rotate, which in turn drives the reciprocating screw 86 to rotate. The reciprocating screw 86 then drives the two sliders 87 to move towards each other, thereby causing the connecting rod 88 to deflect. This, in turn, causes the auxiliary frame 89, which is connected to the connecting rod 88, to move downward. This causes the pressure plate 9 to press the ice block, thereby breaking the arched structure formed by the broken ice, effectively preventing blockage, ensuring a smooth ice discharge process, and greatly improving the operational reliability of the equipment.

[0041] Reference Figure 4 , Figure 5A connecting device is provided between the fixed block 84 and the auxiliary frame 89. The connecting device includes a hollow fixed cylinder 815, which is fixedly disposed on one side of the fixed block 84 and located on the bottom surface of the fixed block 84. One side of the auxiliary frame 89 is fixedly connected to a sliding column 816, which is located on the top surface of the auxiliary frame 89. A return spring 817 is fixedly connected to the inner wall of the fixed cylinder 815. One side of the return spring 817 is fixedly connected to the sliding column 816, which is located on the side away from the return spring 817. The inner wall of the protective frame 83 is rotatably connected to the bevel gear set 810. One side of the bevel gear set 810 is fixedly connected to the rotating shaft 85 through a center point. One side of the bevel gear set 810 is fixedly connected to the rotating column 811, which is located on the side away from the rotating shaft 85. On one side away from the rotating shaft 85, the rotating column 811 is rotatably connected inside the protective frame 83. A limiting post is fixed on the outer surface of the rotating column 811. One side of the auxiliary frame 89 is fixedly connected to the internally empty protective frame 812. The protective frame 812 is located on the side of the auxiliary frame 89 near the pressure plate 9. The inner wall of the protective frame 812 is rotatably connected to the bevel gear set 813. The center of one side of the bevel gear set 813 is slidably connected to the rotating column 811. One side of the bevel gear set 813 is fixedly connected to the rotating shaft 814. The rotating shaft 814 is located on the side away from the bevel gear set 813. The rotating shaft 814 is rotatably connected inside the bevel gear set 813. The outer surface of the rotating shaft 814 is connected to the pressure plate 9. The transmission direction of the pressure plate 9 is consistent with the movement direction of the crushed ice, which facilitates the movement of the crushed ice.

[0042] In use, the rotation of the first shaft 85 drives the first bevel gear set 810 to rotate, the rotation of the first bevel gear set 810 drives the rotation of the rotating column 811, the rotation of the rotating column 811 drives the second bevel gear set 813 to rotate, the rotation of the second bevel gear set 813 drives the second shaft 814 to rotate, which in turn drives the pressure plate 9 to drive the transmission. In addition, while the auxiliary frame 89 moves, it can drive the sliding column 816 to slide inside the fixed cylinder 815, thereby squeezing and stretching the reset spring 817.

[0043] The above-mentioned structure is the core upper assembly of the ice maker, which is vertically installed in the upper part of the ice maker's casing and located directly above the ice storage tank. The bottom end of the spiral push rod 3 is connected to a drive device such as a speed reducer, and the speed reducer can be driven to rotate. The socket of the evaporator can be directly die-cast on the outer shell of the speed reducer. The socket is directly inserted into the inner cylinder 2 and fixed with bolts. The socket can also be provided with a drainage groove to prevent accidental water leakage or condensate from entering the speed reducer.

[0044] The return spring 817 in this device uses the calculation formula for alloy springs: F = kx, where F is the external force on the spring, k is the spring constant, and x is the deformation of the spring, in meters. The elastic force of the alloy spring is then calculated so that it can be used in this device. The return spring 817 is a stainless steel alloy such as SUS304, which has good elastic recovery performance.

[0045] The reciprocating lead screw 86 is made of ordinary C45 steel to ensure transmission accuracy and strength, the slider 87 is made of SUS304 stainless steel, and the connecting rod 88 is made of high-strength aluminum alloy to ensure a lightweight structure and strong load-bearing capacity.

[0046] The implementation principle of an evaporator structure for manufacturing crushed ice according to an embodiment of this application is as follows:

[0047] During use, the refrigerant enters the cavity formed between the outer cylinder 1 and the inner cylinder 2 through the refrigerant inlet pipe, vaporizes and absorbs heat to cool the water in the outer cylinder 1, reaching the freezing point and condensing into ice. The reducer drives the spiral push rod 3 to rotate, and the spiral push rod 3 continuously scrapes the frozen ice crystals off the inner wall of the outer cylinder 1. The ice crystals are pushed and compacted upwards by the spiral push rod 3, and then further compacted by the ice forming cutter 4. The ice crystals are then guided through the ice outlet through the guide channel and further compacted into dense mineral-shaped ice columns. The ice columns are then continuously pushed to the stirring claw 5, where they are broken into ice blocks and continuously fall into the ice storage tank of the ice maker through the ice outlet frame 6.

[0048] As the ice blocks slide within the ice outlet frame 6, the motor 82 drives the rotating shaft 85 and reciprocating screw 86 to rotate, which in turn drives the two sliders 87 to move towards each other. This causes the connecting rod 88 to deflect, which in turn drives the auxiliary frame 89, which is rotatably connected to the connecting rod 88, to move downwards. This causes the pressure plate 9 to press down on the ice blocks, thereby breaking the arched structure formed by the crushed ice, effectively preventing blockages, ensuring an extremely smooth ice outlet process, and greatly improving the operational reliability of the equipment. At the same time, the rotation of the rotating shaft 85 drives the bevel gear set 810, the rotating column 811, the bevel gear set 813, and the rotating shaft 814 to rotate, which in turn drives the pressure plate 9 to drive the transmission. In addition, while the auxiliary frame 89 moves, it can drive the sliding column 816 to slide inside the fixed cylinder 815, thereby squeezing and stretching the return spring 817. Furthermore, the transmission direction of the pressure plate 9 is consistent with the movement direction of the crushed ice, which facilitates the movement of the crushed ice.

[0049] The above are merely optional embodiments of this application and are 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. An evaporator structure for manufacturing crushed ice, characterized in that: The device includes an outer cylinder (1), an inner cylinder (2) inside the outer cylinder (1), a spiral pusher (3) for transporting ice blocks inside the inner cylinder (2), an ice-forming cutter (4) inside the inner cylinder (2), an ice-discharging frame (6) on the top surface of the outer cylinder (1), a stirring claw (5) fixedly provided on the top surface of the ice-discharging cutter (4), an auxiliary mechanism (8) for preventing ice block accumulation inside the ice-discharging frame (6), and a pressure plate (9) for squeezing ice blocks at the output end of the auxiliary mechanism (8).

2. The evaporator structure for manufacturing crushed ice according to claim 1, characterized in that: A fixing plate (7) is fixedly connected to one side of the ice outlet frame (6). The auxiliary mechanism (8) includes a fixing frame (81), which is symmetrically fixed on both sides of the fixing plate (7). A motor (82) is fixedly installed inside the fixing frame (81).

3. The evaporator structure for manufacturing crushed ice according to claim 2, characterized in that: A protective frame (83) is fixedly installed on one side of the ice outlet frame (6), and a rotating shaft (85) fixedly installed with the motor (82) is rotatably installed through the protective frame (83). A fixing block (84) is installed inside the ice outlet frame (6).

4. The evaporator structure for manufacturing crushed ice according to claim 3, characterized in that: The fixed block (84) is rotatably provided with a reciprocating screw (86) fixedly provided with a rotating shaft (85). The outer surface of the reciprocating screw (86) is symmetrically provided with a slider (87). A connecting rod (88) is rotatably provided on one side of the slider (87). An auxiliary frame (89) is rotatably provided on one side of the connecting rod (88).

5. The evaporator structure for manufacturing crushed ice according to claim 4, characterized in that: A connecting device is provided between the fixing block (84) and the auxiliary frame (89).

6. The evaporator structure for manufacturing crushed ice according to claim 5, characterized in that: The connecting device includes a fixed cylinder (815) fixedly disposed on one side of the fixed block (84), a sliding column (816) fixedly disposed on one side of the auxiliary frame (89), and a return spring (817) fixedly disposed between the fixed cylinder (815) and the sliding column (816).

7. The evaporator structure for manufacturing crushed ice according to claim 4, characterized in that: The protective frame (83) is rotatably provided with a bevel gear set (810), and a rotating column (811) is fixedly provided on one side of the bevel gear set (810) and rotatably provided inside the protective frame (83).

8. An evaporator structure for manufacturing crushed ice according to claim 7, characterized in that: A protective frame two (812) is fixedly provided on one side of the auxiliary frame (89). Inside the protective frame two (812), a bevel gear set two (813) is rotatably provided and slidably provided with the rotating column (811). On one side of the bevel gear set two (813), a rotating shaft two (814) is fixedly provided and rotatably provided inside the bevel gear set two (813), and the rotating shaft two (814) is connected to the pressure plate (9) in a transmission configuration.

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