Ice pressing drive structure for ice shaver

Abstract

The utility model discloses a kind of ice pressing drive structure for ice planer, which belongs to the technical field of ice planer, including main body, ice pressing assembly is equipped on main body, it includes worm, ice pressing disc and ice pressing transmission gear, ice pressing disc can be detachably installed in the lower end of worm, ice pressing transmission gear is driven connection with worm, motor drive assembly, it is engaged transmission with ice pressing transmission gear, manual drive assembly, it is staggered drive cooperation with worm;Ice pressing transmission gear is rotated on main body by the engagement of motor drive assembly, and worm is rotated together when rotating, worm is descended on main body by the action of manual drive assembly when rotating;Worm is raised or descended on main body by the staggered drive of manual drive assembly. Motor drive assembly, manual drive assembly are respectively driven cooperation with ice pressing transmission gear, which not only ensures that ice pressing disc is effectively pressed tightly when working, and does not appear up and down bounce, but also enables ice pressing assembly to reset to initial position.

Description

Technical Field

[0001] This utility model relates to the field of ice shaver technology, specifically to an ice-pressing drive structure for an ice shaver. Background Technology

[0002] Chinese utility model patent CN202323445892.X discloses an ice shaver. In operation, the user places ice cubes into the inner cavity of the ice shaver cup, then places the ice shaver cup into the receiving cup's holding area, connects the receiving cup to the main unit, and finally starts the ice shaver. The spring force pushes the anti-slip device to press the ice cubes firmly, ensuring the lower end of the ice cubes is in close contact with the shaver blades. The motor, through the anti-slip device, drives the ice cubes to rotate and shave, achieving a shaving effect where the ice cubes rotate and move downwards to contact the shaver blades. Simultaneously, the spring acts as a reset mechanism for the drive unit. However, in actual use, when the anti-slip device presses down on the ice cubes, the elastic element bounces up and down, causing the anti-slip device to fail to press the ice cubes down effectively, resulting in the ice cubes not adhering tightly to the shaver blades and affecting the shaving effect. Therefore, further improvement is necessary. Utility Model Content

[0003] The present invention aims to provide an ice-pressing drive structure for an ice shaver to overcome the shortcomings of the prior art.

[0004] An ice-pressing drive structure for an ice shaver, designed for this purpose, includes a main body, on which are provided... The ice pressing assembly includes a worm gear, an ice pressing disc, and an ice pressing drive gear. The ice pressing disc is detachably mounted on the lower end of the worm gear, and the ice pressing drive gear is driven by the worm gear. The motor drive assembly meshes with the ice-pressing transmission gear for transmission. Manual drive assembly, which works in conjunction with worm gear drive.

[0005] The ice-pressing transmission gear rotates on the main body through the meshing of the motor drive component, and drives the worm gear to rotate together during rotation. The worm gear descends on the main body through the action of the manual drive component during rotation.

[0006] The worm gear moves up or down on the main body via alternating drives from the manual drive assembly.

[0007] The worm gear is provided with a worm groove, which is recessed into the outer wall of the worm gear along the axis of the worm gear. The ice pressing transmission gear is provided with a connecting hole at the center and is sleeved on the worm gear through the connecting hole. An ice pressing drive part is provided on the connecting hole. The ice pressing drive part extends into the worm groove and slides along the trajectory of the worm groove. The ice pressing transmission gear meshes with the motor drive assembly through the gear part provided on the periphery.

[0008] The motor drive assembly includes a drive motor, a reduction gear set, and a reduction gear set housing. The reduction gear set housing is fixedly installed inside the main body. The drive motor is installed on the reduction gear set housing, and its drive end is connected to the reduction gear set. The reduction gear set is installed inside the reduction gear set housing and meshes with the gear part around the ice pressing transmission gear.

[0009] The reduction gear set housing includes an upper gear set housing and a lower gear set housing. The upper gear set housing and the lower gear set housing are fixedly fitted together and form a housing cavity between them. A housing notch is provided on the upper gear set housing or the lower gear set housing. The housing notch is connected to the housing cavity. The reduction gear set is set inside the housing cavity and at least partially extends out of the housing notch, and meshes with the gear part around the ice pressing transmission gear for transmission.

[0010] A worm limit switch is provided on the upper housing, lower housing, or main body of the gear set. The worm limit switch is electrically connected to the drive motor. A worm limit part is provided on the worm. When the worm descends to the end position, it touches the worm limit switch through the worm limit part.

[0011] The worm gear is provided with helical teeth, which are arranged spirally around the periphery of the worm gear. The manual drive component is driven in an alternating manner with the helical teeth.

[0012] The manual drive assembly includes a manual drive component, a manual transmission gear, and a manual engagement gear; the manual drive component is positioned and rotated on the main body and is driven by the manual transmission gear, which engages with the manual engagement gear for transmission.

[0013] The manual engagement gear, when rotating, is driven by the interlacing of the gear section on the periphery and the helical teeth, thereby driving the worm to rise or fall on the main body.

[0014] The worm gear rotates unidirectionally on the main body via a motor drive assembly. When rotating, the worm gear engages with the gear section on the periphery of the manual meshing gear through helical teeth, thereby enabling the worm gear to rotate and descend on the main body.

[0015] The axis of the ice-pressing transmission gear is parallel to the axis of the reduction gear set, the axis of the ice-pressing transmission gear is perpendicular to the axis of the manual engagement gear, the axis of the manual engagement gear is parallel to the axis of the manual transmission gear, and the worm, ice-pressing disc, and ice-pressing transmission gear are set on the same axis.

[0016] The main body includes a housing and a top cover that are fixedly fitted together. The bottom of the housing is provided with a housing opening, and the top cover is provided with a top cover guide post. The top cover guide post and the housing opening correspond to each other. A worm guide hole is provided at the center of the worm. The top cover guide post is movably fitted onto the worm guide hole. The worm extends and retracts on the housing opening through the cooperation of the worm guide hole and the top cover guide post.

[0017] The lower end of the worm gear is provided with a worm gear buckle. The ice pressing plate is located below the main body, and its upper surface is provided with several screw fasteners. The screw fasteners are arranged in a ring at intervals along the center of the ice pressing plate. The ice pressing plate is rotatably and detachably fastened to the worm gear buckle through the screw fasteners. The bottom surface of the ice pressing plate is also provided with several ice pressing cones or ice pressing guide blocks arranged at intervals.

[0018] This invention utilizes the meshing transmission between the motor drive assembly and the ice-pressing transmission gear, as well as the alternating drive cooperation between the manual drive assembly and the worm gear. This allows the motor drive assembly to drive the worm gear to rotate and descend on the main body during operation, while the manual drive assembly drives the worm gear to linearly rise or fall on the main body. This enables the ice-pressing disc to compact and shave the ice, and then return to its original position. Compared to existing technologies, the meshing method ensures that the ice-pressing disc effectively compacts the ice during operation without jumping up and down, improving the shaving effect. Furthermore, the manual drive assembly ensures that the ice-pressing assembly returns to its initial position for easy re-operation, enhancing the user experience. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the assembly structure of an embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram of the assembly structure from another perspective of an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the assembly cross-sectional structure of an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the assembly cross-section structure from another perspective of an embodiment of the present invention.

[0023] Figure 5 This is an exploded structural diagram of an embodiment of the present invention.

[0024] Figure 6 This is an exploded structural diagram from another perspective of an embodiment of the present invention.

[0025] Figure 7 This is an exploded structural diagram of the ice pressing assembly, motor drive assembly, and manual drive assembly.

[0026] Figure 8 This is an exploded view of the motor drive assembly.

[0027] Figure 9 This is an exploded structural diagram of the motor drive assembly from another perspective.

[0028] Figure 10This is a schematic diagram of the exploded structure of the ice-pressing component.

[0029] Figure 11 This is an exploded structural diagram of the ice-pressing assembly from another perspective. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] See Figures 1-11 The ice-pressing drive structure for the ice shaver includes a main body, on which are provided... The ice pressing assembly includes a worm gear 20, an ice pressing disc 21, and an ice pressing drive gear 22. The ice pressing disc 21 is detachably mounted on the lower end of the worm gear 20, and the ice pressing drive gear 22 is drivenly connected to the worm gear 20. The motor drive assembly meshes with the ice-pressing transmission gear 22 for transmission. The manual drive assembly is engaged in an alternating drive with the worm gear 20.

[0033] The ice-pressing transmission gear 22 rotates on the main body through the meshing of the motor drive assembly, and drives the worm gear 20 to rotate together during rotation. The worm gear 20 descends on the main body through the action of the manual drive assembly during rotation.

[0034] The worm gear 20 is raised or lowered on the main body by the alternating drive of the manual drive component.

[0035] By utilizing the meshing transmission between the motor drive assembly and the ice-pressing transmission gear 22, and the alternating drive cooperation between the manual drive assembly and the worm gear 20, the motor drive assembly can drive the worm gear 20 to rotate and descend on the main body during operation. The manual drive assembly can drive the worm gear 20 to linearly rise or fall on the main body during operation. This allows the ice-pressing disc 21 to complete the pressing and shaving of ice blocks and its reset. Compared with the prior art, the meshing method ensures that the ice-pressing disc 21 effectively presses the ice blocks during operation and does not have the problem of jumping up and down, thus improving the shaving effect of the ice blocks. In addition, the manual drive assembly can ensure that the ice-pressing assembly can be reset to the initial position for the user to perform the next shaving operation, thereby improving the user experience.

[0036] In addition, the combination of motor drive and manual drive allows users to freely choose the driving mode of the ice pressing component according to their actual needs. This not only makes operation convenient but also avoids the problem of the ice shaver not working properly due to power failure, thus improving the user experience.

[0037] The worm 20 is provided with a worm groove 20.1, which is recessed into the outer wall of the worm 20 along the axis of the worm 20. The ice pressing transmission gear 22 is provided with a connecting hole 22.1 at its center and is sleeved on the worm 20 through the connecting hole 22.1. An ice pressing drive part 22.2 is provided on the connecting hole 22.1. The ice pressing drive part 22.2 extends into the worm groove 20.1 and slides along the trajectory of the worm groove 20.1. The ice pressing transmission gear 22 meshes with the motor drive assembly through the gear part provided on the periphery.

[0038] The motor drive assembly includes a drive motor 23, a reduction gear set 24, and a reduction gear set housing. The reduction gear set housing is fixedly installed inside the main body. The drive motor 23 is installed on the reduction gear set housing, and its drive end is connected to the reduction gear set 24. The reduction gear set 24 is installed inside the reduction gear set housing and meshes with the gear part around the ice pressing transmission gear 22.

[0039] The worm 20 is provided with helical teeth 20.3, which are spirally arranged around the periphery of the worm 20. The manual drive component is driven in an alternating manner with the helical teeth 20.3.

[0040] The manual drive assembly includes a manual drive component 28, a manual transmission gear 29, and a manual engagement gear 30; the manual drive component 28 is positioned and rotated on the main body and is drivenly connected to the manual transmission gear 29, and the manual transmission gear 29 engages with the manual engagement gear 30 for transmission.

[0041] When the manual engagement gear 30 rotates, it is driven by the interleaved connection between the gear part on the periphery and the helical gear 20.3 to drive the worm gear 20 to rise or fall on the main body.

[0042] Specifically, the user can rotate the manual drive component 28 by applying force to it. When the manual drive component 28 rotates, it drives the manual transmission gear 29 to rotate on the main body as well. When the manual transmission gear 29 rotates, it is interleaved with the manual engagement gear 30, thereby driving the manual engagement gear 30 to rotate on the main body as well. When the manual engagement gear 30 rotates, its outer gear part can interleave with the helical teeth 20.3, thereby driving the worm gear 20 to rise or fall linearly on the main body to compress the ice and to raise and reset the entire ice pressing assembly.

[0043] The worm gear 20 rotates unidirectionally on the main body through the drive of the motor drive assembly. When rotating, the worm gear 20 engages with the gear part of the manual meshing gear 30 through the helical teeth 20.3, so as to realize the rotation and descent of the worm gear 20 on the main body.

[0044] Specifically, when the drive motor 23 is working, its drive end reduction gear set 24 meshes to drive the reduction gear set 24 to rotate within the reduction gear set housing. When the reduction gear set 24 rotates, it meshes with the gear part around the ice pressing transmission gear 22, thereby driving the ice pressing transmission gear 22 to rotate on the main body. Since the ice pressing drive part 22.2 extends into the worm groove 20.1, the ice pressing transmission gear 22 drives the worm 20 to rotate on the main body as well. In addition, since the gear part around the manual engagement gear 30 and the helical teeth 20.3 are interlocked and the manual engagement gear 30 is not in operation at this time, the rotating worm 20 can descend on the main body and press the ice block by helically engaging the gear part around the manual engagement gear 30 through the helical teeth 20.3.

[0045] Because the ice pressing assembly can descend in a dual manner through a combination of motor-driven and manual-driven components, it can effectively prevent the ice pressing assembly from jumping up and down during operation and ensure that the ice can be effectively pressed and scraped.

[0046] The reduction gear set housing includes an upper gear set housing 25 and a lower gear set housing 26. The upper gear set housing 25 and the lower gear set housing 26 are fixedly fitted together and form a housing cavity between them. A housing notch 25.1 is provided on the upper gear set housing 25 or the lower gear set housing 26. The housing notch 25.1 communicates with the housing cavity. The reduction gear set 24 is disposed in the housing cavity and at least partially extends out of the housing notch 25.1, and meshes with the gear part of the periphery of the ice pressing transmission gear 22 for transmission.

[0047] The upper housing 25 and lower housing 26 of the gear set are fixed to each other by snaps or fasteners. The drive motor 23 is fixed to the upper housing 25 of the gear set by fasteners, and its drive end extends into the housing cavity and is connected to a motor gear. The motor gear meshes with the reduction gear set 24 for transmission. A housing notch 25.1 is provided on one side of the upper housing 25 of the gear set so that a part of the reduction gear set 24 is placed outside the housing cavity, so as to realize the meshing transmission between the reduction gear set 24 and the gear part around the ice pressing transmission gear 22.

[0048] A worm limit switch 27 is provided on the upper housing 25 of the gear set, or the lower housing 26 of the gear set, or the main body. The worm limit switch 27 is electrically connected to the drive motor 23. A worm limit part 20.2 is provided on the worm 20. When the worm 20 descends to the end position, it touches the worm limit switch 27 through the worm limit part 20.2.

[0049] The gear set upper housing 25 is also fixedly mounted with a motor control board 33 by snap-fit ​​or fasteners. The motor control board 33 is electrically connected to the worm limit switch 27 and the drive motor 23. The worm limit switch 27 is fixed to the gear set upper housing 25 by snap-fit ​​or fasteners. The worm limit part 20.2 is located at the top of the worm 20. When the worm 20 descends to the end position, the worm limit part 20.2 touches the worm limit switch 27. At this time, the worm limit switch 27 sends a signal to the motor control board 33 that the worm 20 has descended to the end position, so that the motor control board 33 controls the drive motor 23 to stop working.

[0050] The axis of the ice pressing transmission gear 22 is parallel to the axis of the reduction gear set 24. The axis of the ice pressing transmission gear 22 is perpendicular to the axis of the manual engagement gear 30. The axis of the manual engagement gear 30 is parallel to the axis of the manual transmission gear 29. The worm gear 20, the ice pressing plate 21 and the ice pressing transmission gear 22 are set on the same axis.

[0051] This allows the worm gear 20, the ice pressing plate 21, and the ice pressing transmission gear 22 to rotate on the same axis, with the ice pressing transmission gear 22 rotating parallel to the axis of the reduction gear set 24, and the manual transmission gear 29 and the manual engagement gear 30 rotating perpendicularly to the axis of the reduction gear set 24.

[0052] The main body includes a housing 31 and a top cover 32 that are fixedly fitted together. The bottom of the housing 31 is provided with a housing opening 31.1, and the top cover 32 is provided with a top cover guide post 32.1. The top cover guide post 32.1 and the housing opening 31.1 correspond to each other. The worm gear 20 is provided with a worm gear guide hole 20.4 at its center. The top cover guide post 32.1 is guided and movably fitted onto the worm gear guide hole 20.4. The worm gear 20 extends and retracts on the housing opening 31.1 through the cooperation of the worm gear guide hole 20.4 and the top cover guide post 32.1.

[0053] The housing 31 and the top cover 32 are fixed to each other by snaps or fasteners. The lower end of the worm gear 20 extends out of the housing opening 31.1 and is detachably connected to the ice pressing plate 21. The cooperation between the worm gear guide hole 20.4 and the top cover guide post 32.1 can ensure that the worm gear 20 moves linearly up or down.

[0054] The housing 31 is also provided with a pressing member 35, which is pressed onto the ice pressing transmission gear 22 so that the ice pressing transmission gear 22 rotates on the housing 31 at a designated position, thereby ensuring the drive connection between the ice pressing assembly and the motor drive assembly and the manual drive assembly respectively.

[0055] The side of the housing 31 is also provided with a side opening 31.2. One end of the manual drive component 28 extends out of the side opening 31.2 and is connected to a drive handle 34 so that the user can drive the manual drive component 28.

[0056] The lower end of the worm gear 20 is provided with a worm gear buckle 20.5. The ice pressing plate 21 is located below the main body, and its upper surface is provided with several screw fasteners 21.1. The several screw fasteners 21.1 are arranged in a ring at intervals along the center of the ice pressing plate 21. The ice pressing plate 21 is rotatably and detachably fastened to the worm gear buckle 20.5 through the screw fasteners 21.1. The bottom surface of the ice pressing plate 21 is also provided with several ice pressing cones 21.2 or ice pressing guide blocks 21.3 arranged at intervals.

[0057] The rotational assembly direction of the screw fastener 21.1 and the worm gear fastener 20.5 is the same as the rotational direction of the ice pressing plate 21, so that the screw fastener 21.1 and the worm gear fastener 20.5 can be effectively assembled when the ice pressing plate 21 rotates, preventing the worm gear 20 from loosening from the ice pressing plate 21. At the same time, since the ice pressing plate 21 can be removed, it is convenient for users to clean and maintain it daily.

[0058] Several ice-pressing cones 21.2 are screws, which are fixed to the ice-pressing plate 21 from top to bottom. The ice-pressing guide block 21.3 is an inclined ice-pressing guide protrusion, whose inclination direction is the same as the rotation direction of the ice-pressing plate 21, so as to guide and press the scraped ice.

[0059] The above describes the preferred embodiments of this utility model, illustrating and describing its basic principles, main features, and advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made without departing from the spirit and scope of this utility model, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. An ice-pressing drive structure for an ice shaver, comprising a main body, characterized in that: The main body is provided with The ice pressing assembly includes a worm gear (20), an ice pressing disc (21), and an ice pressing drive gear (22). The ice pressing disc (21) is detachably mounted on the lower end of the worm gear (20), and the ice pressing drive gear (22) is drivenly connected to the worm gear (20). The motor drive assembly meshes with the ice-pressing transmission gear (22) for transmission. The manual drive assembly is engaged with the worm gear (20) in an alternating drive configuration; The ice-pressing transmission gear (22) rotates on the main body through the meshing of the motor drive assembly, and drives the worm (20) to rotate together when rotating. The worm (20) descends on the main body through the action of the manual drive assembly when rotating. The worm gear (20) moves linearly up or down on the main body via the interleaved drive of the manual drive assembly.

2. The ice-pressing drive structure for an ice shaver according to claim 1, characterized in that: The worm (20) is provided with a worm groove (20.1), which is recessed on the outer wall of the worm (20) along the axis of the worm (20). The ice pressing transmission gear (22) is provided with a connecting hole (22.1) at the center and is sleeved on the worm (20) through the connecting hole (22.1). The connecting hole (22.1) is provided with an ice pressing drive part (22.2), which extends into the worm groove (20.1) and slides along the trajectory of the worm groove (20.1). The ice pressing transmission gear (22) meshes with the motor drive assembly through the gear part provided on the periphery.

3. The ice-pressing drive structure for an ice shaver according to claim 2, characterized in that: The motor drive assembly includes a drive motor (23), a reduction gear set (24), and a reduction gear set housing. The reduction gear set housing is fixedly installed inside the main body. The drive motor (23) is installed on the reduction gear set housing and its drive end is connected to the reduction gear set (24). The reduction gear set (24) is installed inside the reduction gear set housing and meshes with the gear part around the ice pressing transmission gear (22).

4. The ice-pressing drive structure for an ice shaver according to claim 3, characterized in that: The gear set housing includes an upper gear set housing (25) and a lower gear set housing (26). The upper gear set housing (25) and the lower gear set housing (26) are fixedly fitted together and form a housing cavity between them. A housing notch (25.1) is provided on the upper gear set housing (25) or the lower gear set housing (26). The housing notch (25.1) is connected to the housing cavity. The gear set (24) is located in the housing cavity and extends at least partially out of the housing notch (25.1), and meshes with the gear part around the ice pressing transmission gear (22) for transmission.

5. The ice-pressing drive structure for an ice shaver according to claim 4, characterized in that: The upper housing (25) of the gear set, or the lower housing (26) of the gear set, or the main body is provided with a worm limit switch (27). The worm limit switch (27) is electrically connected to the drive motor (23). The worm (20) is provided with a worm limit part (20.2). When the worm (20) descends to the end position, it touches the worm limit switch (27) through the worm limit part (20.2).

6. The ice-pressing drive structure for an ice shaver according to claim 3, characterized in that: The worm (20) is provided with helical teeth (20.3), which are spirally arranged around the periphery of the worm (20). The manual drive component is driven and engaged with the helical teeth (20.3) in an alternating manner.

7. The ice-pressing drive structure for an ice shaver according to claim 6, characterized in that: The manual drive assembly includes a manual drive component (28), a manual transmission gear (29), and a manual engagement gear (30); the manual drive component (28) is positioned and rotated on the main body and is drivenly connected to the manual transmission gear (29), and the manual transmission gear (29) engages with the manual engagement gear (30) for transmission; Among them, the manual meshing gear (30) is driven to rotate by the gear part set on the periphery and the helical teeth (20.3) in an alternating drive connection, so as to drive the worm (20) to rise or fall on the main body; The worm (20) rotates unidirectionally on the main body through the drive of the motor drive assembly. When the worm (20) rotates, it engages with the gear part of the manual meshing gear (30) through the helical teeth (20.3) to achieve the rotation and descent of the worm (20) on the main body.

8. The ice-pressing drive structure for an ice shaver according to claim 7, characterized in that: The axis of the ice pressing transmission gear (22) is parallel to the axis of the reduction gear set (24), the axis of the ice pressing transmission gear (22) is perpendicular to the axis of the manual meshing gear (30), the axis of the manual meshing gear (30) is parallel to the axis of the manual transmission gear (29), and the worm (20), the ice pressing plate (21) and the ice pressing transmission gear (22) are set on the same axis.

9. The ice-pressing drive structure for an ice shaver according to claim 1, characterized in that: The main body includes a housing (31) and a top cover (32) that are fixedly fitted together. The bottom of the housing (31) is provided with a housing opening (31.1). The top cover (32) is provided with a top cover guide post (32.1). The top cover guide post (32.1) and the housing opening (31.1) correspond to each other. The worm (20) is provided with a worm guide hole (20.4) at the center. The top cover guide post (32.1) is guided and movably sleeved on the worm guide hole (20.4). The worm (20) extends and retracts on the housing opening (31.1) through the cooperation of the worm guide hole (20.4) and the top cover guide post (32.1).

10. The ice-pressing drive structure for an ice shaver according to claim 1, characterized in that: The lower end of the worm (20) is provided with a worm buckle (20.5). The ice pressing plate (21) is located below the main body and its upper surface is provided with several screw fasteners (21.1). Several screw fasteners (21.1) are arranged in a ring at intervals along the center of the ice pressing plate (21). The ice pressing plate (21) is rotatably and detachably fastened to the worm buckle (20.5) through the screw fasteners (21.1). The bottom surface of the ice pressing plate (21) is also provided with several ice pressing cones (21.2) or ice pressing guide blocks (21.3) arranged at intervals.

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