Knife type grinder and control method thereof

Abstract

The invention provides a knife type grinder and a control method thereof. The cutter type grinding instrument comprises a grinding barrel, a cutter and a cutter, the grinding barrel comprises a top cover, and an inert gas refrigerant inlet and an inert gas refrigerant outlet are formed in the top cover; one end of the first connector is communicated with an inert gas refrigerant storage tank located outside the knife type grinding instrument, and the other end of the first connector is communicated with the inlet in a sealed mode; and one end of the second joint is hermetically communicated with the outlet, and the other end of the second joint is communicated to the outside of the knife type grinder and is used for leading out the redundant inert gas refrigerant in the grinding barrel. The inert gas refrigerant inlet and the inert gas refrigerant outlet are formed in the top cover of the grinding barrel, so that a refrigerant is conveniently injected into the grinding barrel, the grinding process can be completed at a low temperature, and ground materials are always ground in a low-temperature state, so that deterioration caused by temperature rise of the materials in the grinding process is avoided; therefore, the grinding effect of the temperature-sensitive material is improved.

Description

Technical Field

[0001] The invention relates to the technical field of knife-type grinders, and in particular to a knife-type grinder and a control method thereof. Background Art

[0002] At present, there are many types of knife grinders for laboratory use on the market, but the structure is relatively simple. Basically, the end of the motor shaft is inserted into the grinding cup, and the grinding knife is then stuck to the end of the motor shaft. The motor drives the grinding knife to rotate for cutting and grinding. The particle size of the grinding material can be controlled by adjusting the motor speed. It is precisely because of the simple structure that it has fewer functions and can only guarantee the most basic grinding.

[0003] The main structure of most knife grinders on the market, such as Fig.11 As shown, it mainly includes a grinding cup 1, a grinding knife 2, a top cover 3 and a body 4. A driving device 401 is arranged in the body 4, and a driving shaft 402 is arranged on the driving device 401. The end of the driving shaft 402 passes through the body 4. The top cover 3 is buckled on the grinding cup 1; a through hole is arranged at the bottom center of the grinding cup 1 and extends upward to form a central tube 11, and the central tube 11 is used for the driving shaft 402 to pass through; the grinding knife 2 is sleeved on the central tube 11 and is detachably fixedly connected with the driving shaft 402. The grinding cup 1 is also equipped with a top cover 3, so that the knife-type grinder can select different grinding knives according to different materials, that is, it can be suitable for various types of grinding materials, and realizes one machine with multiple uses; at the same time, it also prevents the material from flying out of the grinding cup during the grinding process, ensuring that the grinding material can be continuously retained in the grinding cup during the grinding process, so that the grinding material can be ground evenly in the grinding cup, improving the grinding effect.

[0004] The feeding method of the existing knife grinder is generally to remove the top cover 3, put the sample into the grinding barrel, buckle the top cover, and cover the cover of the device itself before starting; when processing temperature-sensitive samples, additional pre-freezing treatment is required in advance, and grinding treatment is performed after reaching a predetermined temperature, which increases the workload; in particular, when the material is pre-cooled, only the stability of the temperature in the initial stage of grinding can be guaranteed. After the grinding starts, the heat of the motor and the heat generated during the grinding process cannot be effectively avoided. The heat generated by the motor increases the sample temperature, resulting in a poor grinding effect of the sample. Summary of the invention

[0005] The invention provides a knife-type grinder and a control method thereof, which can solve the problem in the prior art that the knife-type grinder cannot grind samples that are sensitive to high temperatures.

[0006] In order to solve the above problems, the present invention provides a knife-type grinding machine, comprising:

[0007] The grinding barrel comprises a top cover, wherein the top cover is provided with an inlet and an outlet for an inert gas refrigerant;

[0008] A first joint, one end of which is in communication with an inert gas refrigerant storage tank located outside the knife grinder, and the other end of which is in sealed communication with the inlet;

[0009] The second joint has one end connected to the outlet in a sealed manner and the other end connected to the outside of the knife grinder, and is used to guide the excess inert gas refrigerant in the grinding barrel.

[0010] In an optional solution of the present invention, the knife grinder further includes a solenoid valve, and the solenoid valve is arranged between the first joint and the storage tank.

[0011] In an optional solution of the present invention, the other end of the second joint is connected to the exhaust fan via a switching block; the switching block includes two connecting pipes with different port diameters.

[0012] In an optional scheme of the present invention, the knife grinder also includes a frame, and the grinding barrel is drawer-type and arranged in the frame; a driving mechanism is provided on the frame, and the driving mechanism includes an input shaft; an output shaft is provided on the top cover; when the grinding barrel is inserted into the frame, one end of the input shaft is correspondingly engaged with one end of the output shaft, so that the input shaft drives the output shaft to rotate; when the grinding barrel is pulled out of the frame, one end of the input shaft is in a separated state from one end of the output shaft.

[0013] In an optional solution of the present invention, the driving mechanism further includes a motor, a pulley group and a mounting plate, the motor is fixed to the mounting plate, and the motor drives the input shaft via the pulley group; an oblong hole is provided on the frame, and the mounting plate can be movably arranged on the frame along the oblong hole.

[0014] In an optional scheme of the present invention, the input shaft and the output shaft are both provided with a toothed connecting block on one end that is relatively clamped; a cam transmission member is provided under the grinding barrel, and the cam transmission member includes a cam, a transmission rod and a booster rod, the cam is provided on the transmission rod, and one end of the booster rod is connected to the transmission rod; when a force is applied to the other end of the booster rod, the cam rotates, driving the grinding barrel to move in a vertical direction; when the grinding barrel moves upward, the two toothed connecting blocks on the input shaft and the output shaft are in a meshing state.

[0015] In an optional solution of the present invention, a pressing plate is provided on the frame, and the pressing plate is located above the grinding barrel. When the grinding barrel moves upward, the pressing plate presses the top cover.

[0016] In an optional solution of the present invention, a foot is provided under the frame, and a pressure sensor is provided between the foot and the frame for measuring the weight of the grinding barrel.

[0017] In an optional solution of the present invention, a temperature sensor is provided in the grinding barrel for detecting the temperature inside the grinding barrel.

[0018] According to another aspect of the present invention, there is provided a method for controlling the knife grinder as described above, comprising:

[0019] detecting the temperature in the grinding barrel;

[0020] If the temperature is higher than the preset temperature, the inert gas refrigerant is injected into the grinding barrel through the inlet until the temperature in the grinding barrel is equal to or lower than the preset temperature.

[0021] The present invention has the following beneficial effects:

[0022] The inert gas refrigerant inlet and outlet are arranged on the top cover of the grinding barrel, so as to facilitate the injection of refrigerant into the grinding barrel, ensure that the grinding process can be completed at a low temperature, and ensure that the grinding material is always ground at a low temperature, so as to avoid the temperature rise of the material during grinding and cause deterioration, thereby improving the grinding effect of temperature-sensitive materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the following briefly introduces the drawings required for use in the specific implementation or the prior art description. Obviously, the drawings described below are some implementations of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the knife type grinder of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the knife type grinder of the present invention;

[0026] Figure 3 It is a schematic diagram of the frame structure of the knife grinder of the present invention;

[0027] Figure 4 It is a schematic cross-sectional view of the knife-type grinder of the present invention;

[0028] Figure 5 It is a schematic diagram of the external structure of the grinding barrel of the present invention;

[0029] Figure 6 is a cross-sectional schematic diagram of a grinding barrel of the present invention;

[0030] Figure 7 It is a schematic diagram of the structure of the top cover of the present invention;

[0031] Figure 8 It is a partial cross-sectional structural schematic diagram of the knife-type grinder of the present invention;

[0032] Fig. 9 Another partial structural schematic diagram of a knife-type grinder of the present invention in a partial cross-section;

[0033] Fig.10 It is a partial cross-sectional structural schematic diagram of the grinding barrel of the present invention;

[0034] Fig.11 It is a schematic diagram of the cross-sectional structure of a traditional knife grinder.

[0035] The reference numerals are as follows:

[0036] 100, rack; 101, mounting plate; 102, first pillar; 103, support plate; 104, foot; 105, pressure sensor; 106, first connector; 107, second connector; 108, first pressure block; 109, second pressure plate;

[0037] 200, grinding barrel; 201, handle; 202, bottom plate; 203, lifting handle; 204, shell; 206, grinding barrel cover plate; 207, fixing block; 208, toothed connecting block; 209, output shaft; 212, feed inlet cover plate; 213, support plate; 214, bearing; 215, inner cover plate; 216, isolation plate; 217, sealing ring; 218, sealing ring; 219, sensor connector; 220, second pillar; 221, collection barrel; 222, rotary cutter; 223, mounting block; 224, temperature sensor; 225, rotating shaft; 226, mounting block; 227, rotating shaft; 228, small bearing; 229, copper sleeve;

[0038] 300, main engine; 301, motor; 302, booster rod; 303, transmission rod; 304, bearing seat; 305, connecting plate; 306, cam; 307, convex rod; 308, lifting plate; 309, guide rail; 310, slider; 311, limit block; 312, adapter block; 313, driven V-belt pulley; 314, input shaft; 315, connecting pipe; 316, solenoid valve; 317, V-belt; 318, driving V-belt pulley; 319, bearing seat; 320, toothed connecting block; 321, sensor connector; 330, exhaust fan; 397, display screen; 398, emergency stop switch; 399, casing. DETAILED DESCRIPTION

[0039] In the description of the present invention, it is necessary to understand that if there are terms such as "center", "inside", "outside", "axial", "radial", "circumferential" and the like indicating orientation or positional relationship, unless otherwise specified, they are understood to be based on the orientation or positional relationship shown in the drawings, which is 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 a limitation on the present invention.

[0040] In addition, if there is a feature defined as "first" or "second", it is only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Features defined as "first" or "second" may explicitly or implicitly include at least one of the defined features. If there is a description of "plurality", the general meaning is to include at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection, it can be a direct connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0042] In the description of this specification, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0043] A knife-type grinder provided in an embodiment of the present application comprises:

[0044] The grinding barrel comprises a top cover, wherein the top cover is provided with an inlet and an outlet for an inert gas refrigerant;

[0045] A first joint, one end of which is in communication with an inert gas refrigerant storage tank located outside the knife grinder, and the other end of which is in sealed communication with the inlet;

[0046] The second joint has one end connected to the outlet in a sealed manner and the other end connected to the outside of the knife grinder, and is used to guide the excess inert gas refrigerant in the grinding barrel.

[0047] Figures 1 to 10 A cryogenic knife grinder according to a specific embodiment of the present invention is provided.

[0048] Figure 1 The schematic diagram of the three-dimensional structure of the knife grinder of the present invention is shown; the knife grinder mainly comprises a housing 399, a display screen 397 and an emergency stop switch 398 are provided on the upper part of the housing 399, and a power rod 302 and a transmission rod 303 are provided on the lower part. The power rod 302 is a cantilever mechanism, and the fixed end is connected to the transmission rod 303; applying force to the free end of the power rod 302 can drive the transmission rod 303 to rotate; Figure 2 The schematic diagram of the inner structure of the knife grinder of the present invention is shown; the internal structure of the housing 399 mainly includes a main machine 300, and the main structure of the main machine 300 includes a frame 100, a motor 301, a transmission rod 303, a power rod 302, a seat bearing 304, a connecting plate 305, a cam 306, a protruding rod 307, a lifting plate 308, a guide rail 309, a slider 310, a limit block 311, a transfer block 312, a driven V-belt pulley 313, an input shaft 314, a connecting pipe 315, a solenoid valve 316, a V-belt 317, an active V-belt pulley 318, a seat bearing 319, a toothed connecting block 320, a sensor connector 321, and an exhaust fan 330. Figure 3 The schematic diagram of the structure of the frame 100 of the knife grinder is shown; the frame 100 mainly includes a mounting plate 101, a first support 102, a support plate 103, a foot 104, a pressure sensor 105, a first joint 106, a second joint 107, a first pressure block 108, and a second pressure plate 109. Figure 4 The schematic cross-sectional structure diagram of the knife grinder is shown; it mainly includes a driven V-belt pulley 313, an input shaft 314, a seat bearing 319, a toothed connecting block 320, a sensor connector 321, and a first connector 106.

[0049] The frame 100 plays a supporting role in the equipment, and most of the other parts will be connected to the frame 100 by screws. The motor 301 will be fixed to the mounting plate 101. Since the mounting hole corresponding to the support plate 103 is an oblong hole, the support 102 can slide on it, and the V-belt 317 can be tightened. The active V-belt pulley 318 is connected to the output shaft of the motor 301 by a flat key and fixed with a top screw. The driven V-belt pulley 313 is connected to the input shaft 314 by a flat key and fixed with a top screw. The input shaft 314 will be inserted into the upper and lower seat bearings 319 in turn. The seat bearings 319 will be installed on the frame 100, and the toothed connecting block 320 will be installed on the bottom of the input shaft 314. Therefore, when the motor 301 rotates, the input shaft 314 will rotate with it.

[0050] A foot 104 is provided below the frame 100, and a pressure sensor 105 is provided between the foot 104 and the frame 100 for measuring the weight of the grinding barrel 200. The weight of the grinding barrel 200 is not limited to the weight of the grinding barrel 200 itself, but also includes the weight of the material in the grinding barrel 200.

[0051] The solenoid valve 316 is fixed to the frame 100 by screws, one end of the solenoid valve 316 is connected to an additional liquid nitrogen storage tank, and the other end is connected to the first joint 106 through the delivery pipe 315. The solenoid valve 316 acts as a switch to control the on and off of the liquid nitrogen; the second joint 107 is installed on the frame 100 by screws, and the adapter block 312 is also installed on the frame 100 by screws. The adapter block 312 includes two connecting pipes with different port diameters. One end of the adapter block 312 is connected to the exhaust fan 330 through a pipeline, and the other end is connected to the second joint 107. When the exhaust fan 330 is started, the nitrogen volatilized in the grinding barrel 200 will be discharged outside the equipment.

[0052] The limit block 311 is fixed to the frame 100 by screws, which can ensure the accuracy of the installation position of the grinding barrel 200 each time; the slider 310 is fixed to the lifting plate 308 by screws, and the guide rail 309 is fixed to the frame 100 by screws. The two lifting plates 308 are connected into a whole by screws by the connecting plate 305, and the convex rod 307 is connected to the bottom of the lifting plate 308 by screws. The two seat bearings 304 are installed to the left and right sides of the equipment by screws, and the transmission rod 303 will pass through the inner hole of the seat bearing 304, and the two cams 306 will be connected to the left and right sides of the transmission rod 303 by flat keys, and the power rod 302 will be connected to the transmission rod 303 by threads. When the power rod 302 is moved upward, the transmission rod 303 and The cam 306 will rotate together, and when rotating, the cam 306 will drive the protruding rod 307 to move upward. At this time, the first pressure block 108 and the second pressure plate 109 will squeeze the grinding barrel 200, thereby locking the grinding barrel 200 (moving the power rod 302 downward will unlock the grinding barrel 200); in addition, after moving the power rod 302 upward, the teeth of the toothed connecting block 320 and the toothed connecting block 208 will be staggered with each other, so that the power of the input shaft 314 can be transmitted to the output shaft 209 through the toothed connecting block, and the first joint 106 and the second joint 107 will penetrate into the corresponding holes on the grinding barrel cover 206, forming a sealing setting for the cover 206; a sealing gasket can be set above the corresponding hole.

[0053] Figure 5 The external structure schematic diagram of the grinding barrel is shown; Figure 6 A schematic cross-sectional view of a grinding barrel is shown; Figure 7A schematic structural diagram of the top cover of the grinding barrel is shown; the main structure of the grinding barrel 200 includes an output shaft 209, a toothed connecting block 208, a fixing block 207, a feed port cover plate 212, a grinding barrel cover plate 206, a support plate 213, an outer shell 204, a handle 201, a bottom plate 202, a lifting handle 203, a bearing 214, an isolation plate 216, an inner cover plate 215, a sealing ring 217, a collection barrel 221, a sealing ring 218, a sensor connector 219, a pillar 220, a rotary knife 222, a mounting block 223, and a temperature sensor 224.

[0054] The inner cover plate 215, the isolation plate 216 and the grinding barrel cover plate 206 are tightly connected together by screws, the toothed connecting block 208 is connected to the top of the output shaft 209 by screws, the fixing block 207 is connected to the grinding barrel cover plate 206 by screws, the output shaft 209 is sequentially passed into the inner hole of the bearing 214, the rotary cutter 222 is connected to the mounting block 223 by screws, the mounting block 223 is mounted to the bottom of the output shaft 209 and fixed by a tight fit, the support plate 213 and the bottom plate 202 are connected together with the pillar 220 through the handle 201 and fixed by screws, the outer shell 204 is fixed to the pillar 220 by screws for protection, and the temperature sensor 224 can detect the temperature at the bottom of the collection barrel 221.

[0055] Figure 8 The schematic diagram of the partial cross-sectional structure of the knife grinder is shown, which mainly includes an input shaft 314 and a toothed connecting block 320 at its lower end, and an output shaft 209 and a toothed connecting block 208 at its upper end. The toothed connecting block 208 and the toothed connecting block 320 are engaged with each other to realize power transmission from the input shaft 314 to the output shaft 209. Fig. 9 Another partial structural schematic diagram of the knife grinder is shown in partial section; it mainly includes a transmission rod 303, a cam 306 and a protruding rod 307; the cam 306 is sleeved on the transmission rod 303 and abuts against the protruding rod 307. When the transmission rod 303 rotates, it can drive the cam 306 to rotate, thereby causing the protruding rod 307 to move.

[0056] Fig.10 A partial cross-sectional structural diagram of the grinding barrel is shown; it mainly includes a lifting handle 203, a rotating shaft 225, a mounting block 226, a rotating shaft 227, a small bearing 228, and a copper sleeve 229; the rotating shaft 225 and the rotating shaft 227 are bonded together with the lifting handle 203, the rotating shaft 227 will penetrate into the inner ring of the small bearing 228, the copper sleeve 229 is tightly fitted into the mounting block 226, the rotating shaft 225 penetrates into the copper sleeve 229, and the mounting block is fixed to the bottom plate 202 by screws.

[0057] After the upper half of the grinding barrel is removed as a whole, the lifting handle 203 is moved downward by hand, and the collecting barrel 221 can be pushed out by the lever. At this time, the collecting barrel 221 can be removed for cleaning.

[0058] According to another aspect of the present invention, there is provided a method for controlling a knife grinder, comprising:

[0059] detecting the temperature in the grinding barrel;

[0060] If the temperature is higher than the preset temperature, the inert gas refrigerant is injected into the grinding barrel through the inlet until the temperature in the grinding barrel is equal to or lower than the preset temperature.

[0061] Specific operation of knife grinder:

[0062] ① Open the feed inlet cover 212, put the sample into the grinding barrel 200, and then put down the feed inlet cover 212;

[0063] ② Push the grinding barrel 200 as a whole into the main unit 300, lift the power lever 302 upwards, and lock the grinding barrel 200;

[0064] ③ Set the speed, grinding time, grinding temperature and other parameters on the screen 321, and press the start button;

[0065] ④ After pressing the start button, the solenoid valve 316 will automatically open, and appropriate liquid nitrogen will enter the grinding barrel 200. When the set temperature is reached, grinding will begin. The liquid nitrogen will volatilize during the grinding process, and the exhaust fan 330 will extract the volatilized nitrogen;

[0066] ⑤ After grinding, push the booster rod 302 downward to unlock the grinding barrel 200;

[0067] ⑥ Pull out the grinding barrel 200, open the upper cover of the grinding barrel 200, and take out the ground sample.

[0068] The present invention can bring the following beneficial effects:

[0069] ① The sample can be directly cooled and pre-cooled in the grinding barrel, which saves the time of taking out and placing the grinding barrel and pre-cooling the sample before making the sample.

[0070] ②The amount of liquid nitrogen used for pre-cooling will be determined according to the weight of the sample and the required grinding temperature to avoid waste of liquid nitrogen;

[0071] ③The grinding knife can be removed from the equipment together with the grinding barrel, which is convenient for cleaning the rotary knife;

[0072] ④The motor and the shaft are driven by a belt, so the heat generated by the motor will not be transferred to the grinding barrel, reducing the input of heat source;

[0073] ⑤The grinding barrel is locked up and down by a cam rod, which is more secure and safe.

[0074] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. Those skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A knife grinder, characterized in that: include: The grinding barrel comprises a top cover, wherein the top cover is provided with an inlet and an outlet for an inert gas refrigerant; A first joint, one end of which is in communication with an inert gas refrigerant storage tank located outside the knife grinder, and the other end of which is in sealed communication with the inlet; The second joint has one end connected to the outlet in a sealed manner and the other end connected to the outside of the knife grinder, and is used to guide the excess inert gas refrigerant in the grinding barrel.

2. The knife grinder according to claim 1, characterized in that: The knife grinder also includes a solenoid valve, which is arranged between the first joint and the storage tank.

3. The knife grinder according to claim 1 or 2, characterized in that: The other end of the second joint is connected to the exhaust fan via a transfer block; the transfer block includes two connecting pipes with different port diameters.

4. The knife grinder according to any one of claims 1 to 3, characterized in that: The knife grinder also includes a frame, and the grinding barrel is drawer-type and arranged in the frame; a driving mechanism is arranged on the frame, and the driving mechanism includes an input shaft; an output shaft is arranged on the top cover; when the grinding barrel is inserted into the frame, one end of the input shaft is correspondingly engaged with one end of the output shaft, so that the input shaft drives the output shaft to rotate; when the grinding barrel is pulled out of the frame, one end of the input shaft is in a separated state from one end of the output shaft.

5. The knife grinder according to claim 4, characterized in that: The driving mechanism also includes a motor, a pulley group and a mounting plate. The motor is fixed on the mounting plate, and the motor drives the input shaft through the pulley group. The frame is provided with an oblong hole, and the mounting plate can be movably arranged on the frame along the oblong hole.

6. The knife grinder according to claim 4, characterized in that: The input shaft and the output shaft are both provided with toothed connecting blocks on one end thereof which is relatively clamped; a cam transmission member is provided below the grinding barrel, the cam transmission member comprises a cam, a transmission rod and a booster rod, the cam is provided on the transmission rod, and one end of the booster rod is connected to the transmission rod; When a force is applied to the other end of the booster rod, the cam rotates to drive the grinding barrel to move in the vertical direction; when the grinding barrel moves upward, the two toothed connecting blocks on the input shaft and the output shaft are in meshing state.

7. The knife grinder according to claim 6, characterized in that: A pressing plate is provided on the frame, and the pressing plate is located above the grinding barrel. When the grinding barrel moves upward, the pressing plate presses the top cover.

8. The knife grinder according to claim 6 or 7, characterized in that: A foot is provided under the frame, and a pressure sensor is provided between the foot and the frame for measuring the weight of the grinding barrel.

9. The knife grinder according to claim 8, characterized in that: A temperature sensor is arranged inside the grinding barrel for detecting the temperature inside the grinding barrel.

10. A method for controlling a knife grinder according to any one of claims 1 to 9, characterized in that: include: detecting the temperature in the grinding barrel; If the temperature is higher than a preset temperature, the inert gas refrigerant is injected into the grinding barrel through the inlet until the temperature in the grinding barrel is equal to or lower than the preset temperature.

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