Snow melting machine

Abstract

The utility model relates to the technical field of ice making equipment, in particular to a snow melting machine. In order to mainly solve the problems that a stirrer is blocked by icing of an evaporation cylinder due to the fact that the icing temperature of slurry is increased due to low sugar content of the slurry, and the machine can not normally make ice, the following technical scheme is provided: the ice crusher comprises a machine body, the machine body comprises a lower shell, a top plate and an ice making bin, and the top plate is mounted at the top of the lower shell; the ice-making bin for containing slurry is fixedly connected to the top of the top plate; the ice making mechanism is arranged in the machine body, the ice making mechanism comprises a cooling assembly and a stirring assembly, the cooling assembly comprises a compressor, a condenser and an evaporation cylinder, and the compressor and the condenser are both installed in the lower shell. The sand ice making machine can still make sand ice when facing slurry with different freezing points, meanwhile, the situation that equipment operation is affected by slurry freezing caused by too low temperature is prevented, and stable operation of the equipment is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of ice making equipment, in particular to a snow melting machine. Background Art

[0002] A snow melt machine is a machine that mixes snow melt powder with water or various fruit juices and sugar in proportion to make snow melt-like smoothies. Currently, common snow melt machines on the market require the slurry to have a sugar content of no less than 13%. If the slurry has a sugar content of less than 13%, the conventional control method may easily cause the slurry freezing temperature to increase due to the low sugar content of the slurry during the machine, thereby causing the evaporator cylinder to freeze and jam the agitator, causing the machine to alarm and stop, and unable to make smoothies normally. In view of this, the utility model proposes a snow melt machine. Utility Model Content

[0003] The utility model aims to propose a snow melting machine to solve the problem in the background technology that the slurry has a low sugar content, which causes the slurry freezing temperature to increase, thereby causing the evaporator cylinder to freeze and jam the stirrer, resulting in the machine alarming and stopping and unable to make smoothies normally.

[0004] The technical solution of the utility model is as follows: a snow melting machine comprises a body, wherein the body comprises a lower shell, a top plate, and an ice-making bin, wherein the top plate is installed on the top of the lower shell, and the ice-making bin for containing slurry is fixedly connected to the top of the top plate; an ice-making mechanism is arranged in the body, and the ice-making mechanism comprises a cooling component and a stirring component, wherein the cooling component comprises a compressor, a condenser, and an evaporator cylinder, wherein the compressor and the condenser are both installed in the lower shell, the hollow evaporator cylinder is fixedly connected to the ice-making bin, and a temperature sensor is installed in the evaporator cylinder; a discharging mechanism is arranged on one side of the ice-making bin for discharging finished shaved ice.

[0005] Optionally, the compressor, condenser, and evaporator cylinder are connected in sequence through copper tubes, a refrigeration valve is arranged between the condenser and the evaporator cylinder, a copper tube is also connected between the output end of the compressor and the evaporator cylinder, and a hot gas bypass valve is installed in the middle section of the copper tube, and multiple groups of capillaries are arranged in the evaporator cylinder and connected to the condenser through copper tubes.

[0006] Optionally, the stirring assembly includes a servo motor, a connecting rod, a mounting bracket, and a stirring blade. The servo motor is installed on a side of the ice making bin away from the discharging mechanism, and the output end of the servo motor passes through a side of the ice making bin and an evaporator cylinder. The connecting rod is fixedly connected to the output end of the servo motor, and the connecting rod passes through a side of the evaporator cylinder away from the servo motor. The mounting bracket is sleeved and installed on one end of the connecting rod away from the servo motor, and the mounting bracket is rotatably connected to the inner wall of the ice making bin, and the spirally arranged stirring blade is installed on the mounting bracket.

[0007] Optionally, the discharging mechanism includes a discharging port, a discharging pipe, a valve stem, a first spring, and a handle. The discharging port is opened on the side of the ice-making bin away from the servo motor, the discharging pipe is installed on the outside of the discharging port, the valve stem is slidably connected in the discharging pipe, the first spring is arranged on the top of the valve stem, and the handle rotatably connected to the side of the discharging pipe away from the ice-making bin is rotatably connected to the valve stem.

[0008] Optionally, it also includes a control component for controlling, the control component includes an electrical box, a switch, and a control module, the electrical box is arranged on the inner wall of the lower shell body, the switch and the control module are installed on the outside of the servo motor, and the compressor, condenser, temperature sensor, refrigeration valve, hot gas bypass valve, servo motor, switch and control module are all electrically connected to the electrical box.

[0009] Optionally, the machine body further includes a cover plate and a motor cover, wherein the cover plate is mounted on the top of the ice making bin, and the motor cover arranged on the outside of the servo motor is mounted on the side of the ice making bin.

[0010] Optionally, it also includes a wiping mechanism for preventing residual shaved ice under the discharge pipe from dripping after melting, the wiping mechanism includes a rotating plate, a mounting seat, a collecting tank, and a baffle, the rotating plate is rotatably connected to the side of the lower shell body, the mounting seat is installed on the top of the rotating plate, the collecting tank made of rubber is slidably connected to the mounting seat, a sweeping rod made of rubber is provided on the top of the collecting tank, and baffles fixedly connected to the side of the lower shell body are symmetrically provided on both sides of the discharge pipe.

[0011] Optionally, the wiping mechanism also includes a fixed plate, a limit rod, a limit disk, a positioning plate, and a second spring. The two groups of fixed plates are respectively arranged under the two groups of baffles. The two groups of limit rods are slidably connected to the fixed plate. The limit disk is fixedly connected to the bottom of the limit rod. The tops of the two groups of limit rods are commonly fixedly connected to a positioning plate. Two groups of protrusions are arranged on the top of the positioning plate. Two groups of second springs are arranged between the positioning plate and the fixed plate. The two groups of second springs are respectively sleeved on the outer rings of the two groups of limit rods.

[0012] Compared with the prior art, the utility model has the following beneficial technical effects:

[0013] The utility model monitors the temperature in real time by arranging a temperature sensor in the evaporation cylinder. At the same time, the electrical box has a built-in motor current detection function to monitor and compare the servo motor in real time. When the current value reaches the preset value minus the advance amount, the hot gas bypass valve opens, and the high-temperature and high-pressure gaseous refrigerant compressed by the compressor enters the evaporation cylinder, thereby increasing the temperature in the evaporation cylinder and preventing the slurry from freezing on the outside of the evaporation cylinder and jamming the stirring blades.

[0014] Furthermore, after the handle drives the valve stem to move upward and discharge the shaved ice, some shaved ice will remain at the bottom of the discharge pipe. Through the setting of the wiping mechanism, the rotating plate drives the collection tank to pass under the discharge pipe when rotating, so that the sweeping rod scrapes the remaining shaved ice into the collection tank, preventing the shaved ice from melting and dripping to attract mosquitoes and affect the environment.

[0015] In summary, the utility model can still make shaved ice when facing slurries with different freezing points, while preventing the slurry from freezing due to excessively low temperature and affecting the operation of the equipment, thereby ensuring the stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of a snow melting machine;

[0017] Figure 2 yes Figure 1 A cross-sectional schematic diagram of

[0018] Figure 3 yes Figure 1 A schematic cross-sectional structure diagram of ;

[0019] Figure 4 yes Figure 3 The enlarged schematic diagram of point A in the middle;

[0020] Figure 5 It is the work flow diagram of the cooling component;

[0021] Figure 6 It is a structural schematic diagram of the wiping mechanism.

[0022] Reference numerals:

[0023] 1. Machine body; 11. Lower shell; 12. Top plate; 13. Ice making bin; 14. Cover plate; 15. Motor cover;

[0024] 2. Cooling component; 21. Compressor; 22. Condenser; 23. Evaporator;

[0025] 3. Stirring assembly; 31. Servo motor; 32. Connecting rod; 33. Mounting frame; 34. Stirring blade;

[0026] 4. Discharging mechanism; 41. Discharging port; 42. Discharging pipe; 43. Valve stem; 44. First spring; 45. Handle;

[0027] 5. Control assembly; 51. Electrical box; 52. Switch; 53. Control module;

[0028] 6. Wiping mechanism; 61. Rotating plate; 62. Mounting seat; 63. Collecting tank; 631. Sweeping rod; 64. Baffle; 65. Fixed plate; 66. Limiting rod; 67. Limiting plate; 68. Positioning plate; 69. Second spring. DETAILED DESCRIPTION

[0029] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0030] The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0031] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Embodiment 1

[0034] like Figure 1 As shown, the snow melting machine proposed by the utility model includes a body 1, which includes a lower shell 11, a top plate 12, and an ice making bin 13. The top plate 12 is installed on the top of the lower shell 11, and the ice making bin 13 for containing slurry is fixedly connected to the top of the top plate 12. The body 1 also includes a cover plate 14 and a motor cover 15. The cover plate 14 is installed on the top of the ice making bin 13. After the cover plate 14 is opened, it is convenient to add slurry to the ice making bin 13. The motor cover 15 arranged on the outside of the servo motor 31 is installed on the side of the ice making bin 13 to protect the servo motor 31.

[0035] For details, please refer to Figure 2 , Figure 3 and Figure 5 The above-mentioned snow melting machine includes an ice-making mechanism arranged in the body 1, and the ice-making mechanism includes a cooling component 2 and a stirring component 3, wherein the cooling component 2 includes a compressor 21, a condenser 22 and an evaporator cylinder 23, the compressor 21 and the condenser 22 are both installed in the lower shell 11, the hollow evaporator cylinder 23 is fixedly connected to the ice-making bin 13, and a temperature sensor is installed in the evaporator cylinder 23 for monitoring the real-time temperature of the evaporator cylinder 23. The compressor 21, the condenser 22 and the evaporator cylinder 23 are connected in sequence through a copper tube, the compressor 21 drives the refrigerant to flow in the copper tube, the condenser 22 dissipates heat, and the evaporator cylinder 23 absorbs heat to form a closed loop, and the temperature is transferred through the refrigerant as a medium. A refrigeration valve is arranged between the condenser 22 and the evaporator cylinder 23, and the refrigeration valve is in a normally open state, which is used to control the refrigeration of the evaporator cylinder 23. A copper tube is also connected between the output end of the compressor 21 and the evaporation cylinder 23, and a hot gas bypass valve is installed in the middle of the copper tube. When the hot gas bypass valve is opened, the high-temperature and high-pressure gaseous refrigerant compressed by the compressor 21 enters the evaporation cylinder 23, thereby increasing the temperature of the evaporation cylinder 23 and preventing the slurry from freezing. Multiple groups of capillaries are arranged in the evaporation cylinder 23 and connected to the condenser 22 through copper tubes to improve the efficiency of heat exchange.

[0036] Furthermore, the stirring assembly 3 in the above-mentioned snow melting machine includes a servo motor 31, a connecting rod 32, a mounting frame 33, and a stirring blade 34. The servo motor 31 is installed on the side of the ice making bin 13 away from the discharging mechanism 4. The output end of the servo motor 31 passes through one side of the ice making bin 13 and the evaporating cylinder 23. The connecting rod 32 is fixedly connected to the output end of the servo motor 31. After the servo motor 31 is started, the connecting rod 32 is driven to rotate. The connecting rod 32 passes through the side of the evaporating cylinder 23 away from the servo motor 31. The mounting frame 33 is sleeved and installed on one end of the connecting rod 32 away from the servo motor 31. When the connecting rod 32 rotates, it drives the mounting frame 33 to rotate. The mounting frame 33 is rotatably connected to the inner wall of the ice making bin 13, and the mounting frame 33 rotates in place. The spirally arranged stirring blade 34 is installed on the mounting frame 33. When the mounting frame 33 rotates, it drives the stirring blade 34 to rotate, thereby turning the slurry outside the evaporating cylinder 23, so that the slurry in the ice making bin 13 is fully in contact with the outer wall of the evaporating cylinder 23, thereby realizing refrigeration to form shaved ice.

[0037] Furthermore, Figure 4As shown, the above-mentioned snow melting machine includes a discharge mechanism 4 arranged on one side of the ice making bin 13 for discharging the finished shaved ice. The discharge mechanism 4 includes a discharge port 41, a discharge pipe 42, a valve stem 43, a first spring 44, and a handle 45. The discharge port 41 is opened on the side of the ice making bin 13 away from the servo motor 31, and the discharge pipe 42 is installed on the outside of the discharge port 41. The shaved ice flows out through the discharge port 41 and flows downward in the discharge pipe 42. The valve stem 43 is slidably connected to the discharge pipe 42, and the valve stem 43 is used to seal the discharge port 41 to control the discharge of the shaved ice. The first spring 44 is arranged on the top of the valve stem 43, and the first spring 44 is used to release the elastic force to drive the valve stem 43 to reset. The handle 45 rotatably connected to the discharge pipe 42 away from the ice making bin 13 is rotatably connected to the valve stem 43, and is used to drive the valve stem 43 to slide in the discharge pipe 42 when the handle 45 is rotated, so that the shaved ice can flow out from the discharge port 41.

[0038] Finally, the above-mentioned snow melting machine also includes a control component 5 for control, and the control component 5 includes an electrical box 51, a switch 52, and a control module 53. The electrical box 51 is arranged on the inner wall of the lower shell 11, and the switch 52 and the control module 53 are both installed on the outside of the servo motor 31. The compressor 21, the condenser 22, the temperature sensor, the refrigeration valve, the hot gas bypass valve, the servo motor 31, the switch 52 and the control module 53 are all electrically connected to the electrical box 51, and the electrical box 51 is used to receive various signals and perform automatic processing. As the slurry in the ice making bin 13 partially condenses, the resistance of the mounting frame 33 and the stirring blade 34 during rotation increases, and then the current of the servo motor 31 changes. In addition, the electrical box 51 has a built-in current protection function, and the current value is adjustable. When the servo motor 31 is working, the electrical box 51 continuously detects the servo motor 31 and compares it with the protection current setting value. When the current of the servo motor 31 reaches the first 0.5A of the protection current setting value, the hot gas bypass valve opens to defrost the evaporator 23. The opening time of the hot gas bypass valve is adjustable, and the compressor 21 and the refrigeration valve are not closed. At the same time, the current protection value can be adjusted by the switch 52 to be suitable for slurries with different sugar contents.

[0039] In this embodiment, the cover plate 14 is first opened to pour the prepared slurry into the ice making bin 13, and then the cover plate 14 is closed. After the value is set by the switch 52, the control module 53 is pressed, and the electrical box 51 sends a signal to start the servo motor 31. The servo motor 31 drives the mounting frame 33 to rotate through the connecting rod 32, and the mounting frame 33 drives the stirring blade 34 to rotate outside the evaporation cylinder 23 to turn the slurry. At this time, the compressor 21 starts to drive the refrigerant circulation to cool the evaporation cylinder 23. At this time, the slurry is fully in contact with the evaporation cylinder 23 while constantly turning, and part of the water in it condenses into ice to form shaved ice. When the temperature is low, the temperature sensor senses that the temperature is low. At the same time, due to the high content of ice chips in the shaved ice, the current of the servo motor 31 changes, so that the electrical box 51 senses and then opens the hot gas bypass valve, and the high-temperature and high-pressure gaseous refrigerant compressed by the compressor 21 enters the evaporation cylinder 23, thereby increasing the temperature of the evaporation cylinder 23 to prevent its surface from freezing and affecting the operation. After the shaved ice is made, the handle 45 is pulled downward to drive the valve stem 43 to move upward, so that the shaved ice is discharged through the discharge port 41 and flows out from the lower port of the discharge pipe 42 . Embodiment 2

[0040] like Figure 1 , Figure 2 and Figure 6As shown, based on the first embodiment, it also includes a wiping mechanism 6 for preventing the residual shaved ice below the discharge pipe 42 from melting and dripping. The wiping mechanism 6 includes a rotating plate 61, a mounting seat 62, a collection tank 63, and a baffle 64. The rotating plate 61 is rotatably connected to the side of the lower shell 11, and the mounting seat 62 is installed on the top of the rotating plate 61. The collection tank 63 made of rubber is slidably connected to the mounting seat 62. The rubber material makes the collection tank 63 firmly connected. When the rotating plate 61 rotates, it drives the collection tank 63 to move and sweep across the bottom of the discharge pipe 42. A sweeping rod 631 made of rubber is provided on the top of the collection tank 63. When the sweeping rod 631 contacts the bottom of the discharge pipe 42, the remaining shaved ice is scraped into the collection tank 63 for storage. Baffles 64 fixedly connected to the side of the lower shell 11 are symmetrically provided on both sides of the discharge pipe 42. The baffles 64 are used to cover the top of the collection tank 63 to prevent mosquitoes from entering. The wiping mechanism 6 also includes a fixed plate 65, a limiting rod 66, a limiting disk 67, a positioning plate 68, and a second spring 69. Two groups of fixed plates 65 are respectively arranged below the two groups of baffles 64. Two groups of limiting rods 66 are slidably connected to the fixed plate 65. The limiting disk 67 is fixedly connected to the bottom of the limiting rod 66. The tops of the two groups of limiting rods 66 are commonly fixedly connected with a positioning plate 68. The top of the positioning plate 68 is provided with two groups of protrusions, which are used for the positioning plate 68 to clamp the position of the rotating plate 61, so that when receiving the shaved ice, the collecting tank 63 is fixed at the side and lower position of the discharge pipe 42, so as not to affect the receiving of the shaved ice. Two groups of second springs 69 are arranged between the positioning plate 68 and the fixed plate 65. The two groups of second springs 69 are respectively sleeved on the outer rings of the two groups of limiting rods 66. The second springs 69 are used to release elastic force to ensure the fixed positioning of the rotating plate 61.

[0041] In this embodiment, after receiving the smoothie, the rotating plate 61 is rotated so that the rotating plate 61 leaves the top of the positioning plate 68. When passing under the discharge pipe 42, the sweeping rod 631 scrapes off the smoothie remaining under the discharge pipe 42 and makes it fall into the collection tank 63. At the same time, the rotating plate 61 continues to be rotated so that the rotating plate 61 is stuck on another set of positioning plates 68. At the same time, the collection tank 63 is located under the baffle 64 to prevent mosquitoes from entering, thereby ensuring environmental hygiene.

[0042] The above-mentioned specific embodiments are only several optional embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

Claims

1. A snow melting machine, characterized in that: include: A machine body (1), the machine body (1) comprising a lower shell (11), a top plate (12), and an ice making bin (13), the top plate (12) being mounted on the top of the lower shell (11), and the ice making bin (13) for containing slurry being fixedly connected to the top of the top plate (12); An ice-making mechanism is arranged in the machine body (1), the ice-making mechanism comprising a cooling component (2) and a stirring component (3), wherein the cooling component (2) comprises a compressor (21), a condenser (22) and an evaporation cylinder (23), the compressor (21) and the condenser (22) are both installed in the lower shell (11), the hollow evaporation cylinder (23) is fixedly connected to the ice-making bin (13), and a temperature sensor is installed in the evaporation cylinder (23); A discharging mechanism (4) is provided on one side of the ice making bin (13) and is used to discharge finished shaved ice.

2. A snow melting machine according to claim 1, characterized in that: The compressor (21), the condenser (22), and the evaporator cylinder (23) are connected in sequence via copper tubes; a refrigeration valve is provided between the condenser (22) and the evaporator cylinder (23); a copper tube is also connected between the output end of the compressor (21) and the evaporator cylinder (23); a hot gas bypass valve is installed in the middle of the copper tube; and a plurality of capillary tubes are provided in the evaporator cylinder (23) and are connected to the condenser (22) via copper tubes.

3. A snow melting machine according to claim 2, characterized in that: The stirring assembly (3) comprises a servo motor (31), a connecting rod (32), a mounting frame (33), and a stirring blade (34); the servo motor (31) is mounted on a side of the ice making bin (13) away from the discharging mechanism (4); the output end of the servo motor (31) passes through a side of the ice making bin (13) and an evaporating cylinder (23); the connecting rod (32) is fixedly connected to the output end of the servo motor (31); the connecting rod (32) passes through a side of the evaporating cylinder (23) away from the servo motor (31); the mounting frame (33) is sleeved and mounted on an end of the connecting rod (32) away from the servo motor (31); the mounting frame (33) is rotatably connected to the inner wall of the ice making bin (13); and the spirally arranged stirring blade (34) is mounted on the mounting frame (33).

4. A snow melting machine according to claim 3, characterized in that: The discharge mechanism (4) comprises a discharge port (41), a discharge pipe (42), a valve stem (43), a first spring (44), and a handle (45); the discharge port (41) is opened on a side of the ice making bin (13) away from the servo motor (31); the discharge pipe (42) is installed on the outside of the discharge port (41); the valve stem (43) is slidably connected to the discharge pipe (42); the first spring (44) is arranged on the top of the valve stem (43); and the handle (45) rotatably connected to the side of the discharge pipe (42) away from the ice making bin (13) is rotatably connected to the valve stem (43).

5. A snow melting machine according to claim 3, characterized in that: The invention also includes a control component (5) for performing control, wherein the control component (5) includes an electrical box (51), a switch (52), and a control module (53); the electrical box (51) is arranged on the inner wall of the lower shell (11); the switch (52) and the control module (53) are both installed on the outside of the servo motor (31); and the compressor (21), the condenser (22), the temperature sensor, the refrigeration valve, the hot gas bypass valve, the servo motor (31), the switch (52), and the control module (53) are all electrically connected to the electrical box (51).

6. A snow melting machine according to claim 3, characterized in that: The machine body (1) further comprises a cover plate (14) and a motor cover (15); the cover plate (14) is mounted on the top of the ice making bin (13); and the motor cover (15) arranged on the outside of the servo motor (31) is mounted on the side of the ice making bin (13).

7. A snow melting machine according to claim 4, characterized in that: The invention also comprises a wiping mechanism (6) for preventing residual shaved ice below the discharge pipe (42) from dripping after melting, the wiping mechanism (6) comprising a rotating plate (61), a mounting seat (62), a collecting tank (63), and a baffle (64), the rotating plate (61) being rotatably connected to the side of the lower shell (11), the mounting seat (62) being mounted on the top of the rotating plate (61), the collecting tank (63) made of rubber being slidably connected to the mounting seat (62), a sweeping rod (631) made of rubber being arranged on the top of the collecting tank (63), and baffles (64) fixedly connected to the side of the lower shell (11) being symmetrically arranged on both sides of the discharge pipe (42).

8. A snow melting machine according to claim 7, characterized in that: The wiping mechanism (6) further comprises a fixed plate (65), a limiting rod (66), a limiting disk (67), a positioning plate (68), and a second spring (69). The two groups of the fixed plates (65) are respectively arranged below the two groups of baffles (64). The fixed plate (65) is slidably connected to the two groups of limiting rods (66). The limiting disk (67) is fixedly connected to the bottom of the limiting rod (66). The tops of the two groups of limiting rods (66) are commonly fixedly connected to the positioning plate (68). The tops of the positioning plates (68) are provided with two groups of protrusions. Two groups of second springs (69) are arranged between the positioning plate (68) and the fixed plate (65). The two groups of second springs (69) are respectively sleeved on the outer rings of the two groups of limiting rods (66).

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