Special grease for high-temperature bearing, stirring and conveying device and preparation method of special grease

Abstract

The invention discloses grease special for a high-temperature bearing, a stirring and conveying device and a preparation method of the grease. The stirring and conveying device comprises a kettle body, a temperature control system, an internal circulation stirring system and an external circulation conveying system. The preparation method comprises the following steps: heating and stirring, adding the synthetic base oil, the boron nitride and the composite lithium-based soap-based thickening agent into a kettle body, and starting a temperature control system, an internal circulation stirring system and an external circulation conveying system; preserving heat; heating and stirring, adding an oiliness agent butyl oleate, a metal deactivator and an auxiliary antioxidant into the kettle body, and starting a temperature control system, an internal circulation stirring system and an external circulation conveying system; cooling is performed; and discharging. The special grease for the high-temperature bearing comprises the following components in parts by weight: 60-80 parts of synthetic base oil, 1-5 parts of boron nitride, 10-15 parts of a composite lithium-based soap-based thickening agent, 5-10 parts of an oiliness agent butyl oleate, 1-5 parts of a metal deactivator and 1-5 parts of an auxiliary antioxidant.

Description

Technical Field

[0001] The invention relates to the technical field of lubricating grease production, and in particular to a special grease for high-temperature bearings, a stirring and conveying device and a preparation method thereof. Background Art

[0002] Water vapor will emulsify ordinary lithium-based grease to form a muddy substance that will be lost, causing lubrication failure and environmental protection risks; under high temperatures, ordinary lithium-based grease will melt and flow or the wax will solidify and lose its lubrication performance; the reason for the burning of high-speed bearings may be due to fine particles with a diameter of only 100um. The life of the grease decreases by half for every 15°C increase in temperature. Only high-temperature resistant grease can allow the bearing to operate well in a high-temperature environment; lubricants containing 0.05% water reduce the life of bearings by 50% compared to lubricants containing 0.01% water.

[0003] Special bearing grease is usually produced in a kettle. The weight of various raw materials is calculated according to the formula of the grease. The pre-treated raw materials are then put into the kettle for stirring, saponification, dehydration, refining, blending and other processes.

[0004] In the industry, a temperature control system is usually installed on the outer wall of the kettle body to conduct the temperature to the inside of the kettle body through the outer wall, so as to achieve temperature control of the raw materials in the kettle body, or to heat or cool the raw materials. Since the temperature of the raw materials in the kettle body is controlled by temperature conduction, even if there is a stirring rod to stir the raw materials, it is difficult for the temperature to reach the center of the kettle body quickly and effectively, making it difficult to control the temperature of the raw materials in the center of the kettle body. This will have a serious impact on the accuracy of the grease production process, making it difficult to obtain high-quality target grease.

[0005] In addition, the industry also adopts the method of setting up a temperature control system at the center of the kettle body, and realizing precise temperature control of the raw materials in the kettle body through two sets of temperature control systems inside and outside. However, this method is not advisable. On the one hand, the production cost is high. On the other hand, since there is a stirring rod in the kettle body, the internal temperature control system needs to avoid the stirring rod, which is very difficult to design. On the other hand, once there is a problem with the internal temperature control system, maintenance will become extremely difficult.

[0006] Therefore, how to set up a special grease for high-temperature bearings, a stirring and conveying device and a preparation method thereof, based on the premise of setting a temperature control system on the outer wall of a traditional kettle body, to achieve rapid and effective control of the temperature of the raw materials in the kettle body, improve the accuracy of the grease production process, and obtain high-quality target grease, this is a technical problem that needs to be solved. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a special grease for high-temperature bearings, a stirring and conveying device and a preparation method thereof. Based on the premise of setting a temperature control system on the outer wall of a traditional kettle body, the temperature of the raw materials in the kettle body can be quickly and effectively controlled, the accuracy of the grease production process can be improved, and high-quality target grease can be obtained.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] A high-temperature bearing special grease stirring and conveying device, comprising: a kettle body, a temperature control system, an internal circulation stirring system, and an external circulation conveying system;

[0010] The kettle body is placed obliquely, the central axis of the kettle body is not perpendicular to the horizontal plane, and the kettle body has a top end and a bottom end;

[0011] The temperature control system is arranged on the outer wall of the kettle body;

[0012] The internal circulation stirring system comprises: a rotating sleeve, a lifting spiral sheet, and a pressing spiral sheet; the rotating sleeve is rotatably arranged in the kettle body, the rotating shaft of the rotating sleeve and the central axis of the kettle body are located on the same straight line, the interior of the rotating sleeve forms a raw material ascending channel, and the cylinder wall of the rotating sleeve and the inner wall of the kettle body form a raw material sinking channel, the lifting spiral sheet is arranged on the inner cylinder wall of the rotating sleeve, and the pressing spiral sheet is arranged on the outer cylinder wall of the rotating sleeve; the internal circulation stirring system also comprises a stirring driving part for driving the rotating sleeve to rotate;

[0013] The external circulation conveying system includes an external circulation conveying pipe and a discharge pipe, the two ends of the external circulation conveying pipe are respectively connected with the bottom end and the top end of the kettle body, the external circulation conveying pipe is provided with a first valve near the bottom end of the kettle body, and the external circulation conveying pipe is provided with a second valve near the top end of the kettle body, the discharge pipe is connected with the external circulation conveying pipe and is located between the first valve and the second valve, and the discharge pipe is provided with a third valve.

[0014] In one embodiment,

[0015] The stirring driving part includes a driving shaft and a driving motor connected to the driving shaft; the driving motor is arranged outside the top end of the kettle body, and the driving shaft is rotatably arranged inside the kettle body;

[0016] The rotating axis of the driving shaft is located on the same straight line as the central axis of the kettle body, the lifting spiral piece extends from the bottom end to the top end of the kettle body, the driving shaft is plugged into and fixed on the lifting spiral piece, and the driving shaft drives the rotating sleeve to rotate through the lifting spiral piece.

[0017] In one of the embodiments, the downward pressing spiral piece spirally surrounds the outer cylinder wall of the rotating sleeve, and the downward pressing spiral piece extends from the top end to the bottom end of the kettle body.

[0018] In one embodiment,

[0019] The lifting spiral blade is made of a rigid material, and the pressing spiral blade is made of a flexible material;

[0020] The edge of the downward pressing spiral piece is pressed against the inner wall of the kettle body.

[0021] In one of the embodiments, the outer circulation conveying pipe is provided with a double-layer homogenizing pump and an ultrasonic generator.

[0022] In one embodiment, the temperature control system includes a wrapping sleeve, the wrapping sleeve is wrapped around the outer wall of the kettle body, and a sandwich is formed between the wrapping sleeve and the outer wall of the kettle body;

[0023] The wrapping sleeve has a liquid inlet and a liquid outlet which are communicated with the interlayer.

[0024] In one embodiment, a kettle cover is provided on the top of the kettle body.

[0025] A method for preparing special grease for high-temperature bearings, based on the above-mentioned special grease stirring and conveying device for high-temperature bearings, comprises the following steps:

[0026] Step 1: Add synthetic base oil, boron nitride, and composite lithium soap thickener into the kettle, start the temperature control system to heat the raw materials in the kettle, start the internal circulation stirring system to stir the raw materials in the kettle, start the external circulation conveying system, open the first valve and the second valve, and close the third valve, so that the raw materials are conveyed from the bottom end of the kettle to the top end along the external circulation conveying pipe;

[0027] Step 2, starting the temperature control system to keep the raw materials in the kettle warm;

[0028] Step 3: Adding the oiliness agent butyl oleate, the metal deactivator, and the auxiliary antioxidant into the kettle, starting the temperature control system to heat the raw materials in the kettle, starting the internal circulation stirring system to stir the raw materials in the kettle, starting the external circulation conveying system, opening the first valve and the second valve, and closing the third valve, so that the raw materials are conveyed from the bottom end of the kettle to the top end along the external circulation conveying pipe;

[0029] Step 4, starting the temperature control system to cool the raw materials in the kettle;

[0030] Step five, discharging, close the second valve, open the first valve and the third valve, so that the raw materials in the kettle body are discharged along the external circulation conveying pipe and the discharging pipe.

[0031] A special grease for high-temperature bearings is prepared based on the above-mentioned special grease for high-temperature bearings preparation method, and the component ratio is calculated by weight, including the following components:

[0032] 60-80 parts of synthetic base oil, 1-5 parts of boron nitride, 10-15 parts of complex lithium soap thickener, 5-10 parts of oiliness agent butyl oleate, 1-5 parts of metal deactivator, and 1-5 parts of auxiliary antioxidant.

[0033] In one embodiment, the secondary antioxidant includes phosphites, thiodipropionates and thiols.

[0034] The present invention discloses a special grease for high-temperature bearings, a stirring and conveying device and a preparation method thereof, which realizes rapid and effective control of the temperature of raw materials in the kettle body based on the premise that a temperature control system is set on the outer wall of a traditional kettle body, thereby improving the accuracy of the grease production process to obtain high-quality target grease. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A schematic diagram of a stirring and conveying device for high-temperature bearing grease according to an embodiment of the present invention;

[0037] Figure 2 for Figure 1 The schematic diagram of the kettle body, temperature control system and external circulation conveying system shown;

[0038] Figure 3 for Figure 1 Schematic diagram of the internal circulation stirring system shown;

[0039] Figure 4 This is a process flow chart of a method for preparing a special grease for high-temperature bearings according to an embodiment of the present invention;

[0040] Figure 5 This is a table of components of the special grease for high temperature bearings of the present invention. DETAILED DESCRIPTION

[0041] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0042] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0044] like Figure 1 As shown, the present invention discloses a high-temperature bearing special grease stirring and conveying device 10, comprising: a kettle body 100, a temperature control system 200, an internal circulation stirring system 300, and an external circulation conveying system 400.

[0045] like Figure 2 As shown, the kettle body 100 is placed at an angle, the central axis of the kettle body 100 is not perpendicular to the horizontal plane, and the kettle body 100 has a top 110 and a bottom 120. In this embodiment, the central axis of the kettle body 100 is at an angle of 60 degrees to the horizontal plane. In other embodiments, the central axis of the kettle body 100 can also be at an angle of 45 degrees to the horizontal plane, depending on the actual situation. The top 110 of the kettle body 100 is provided with a kettle cover 130, which is opened to put raw materials, such as base oil, additives and other substances, into the kettle body 100.

[0046] like Figure 2As shown, the temperature control system 200 is arranged on the outer wall of the kettle body 100, and the temperature control system 200 transfers the temperature to the raw materials in the kettle body 100 by temperature conduction, or heats up the raw materials in the kettle body 100, or cools down the raw materials in the kettle body 100, or keeps the raw materials in the kettle body 100 warm. In this embodiment, the temperature control system 200 includes a wrapping sleeve 210, which is wrapped around the outer wall of the kettle body 100, and an interlayer 230 is formed between the wrapping sleeve 210 and the outer wall of the kettle body 100; the wrapping sleeve 210 has a liquid inlet 231 and a liquid outlet 231 that are connected to the interlayer 230. For example, if hot oil is introduced into the interlayer 230, the raw materials in the kettle body 100 can be heated by temperature conduction, and if cold oil is introduced into the interlayer 230, the raw materials in the kettle body 100 can be cooled by temperature conduction.

[0047] Conventionally, it is difficult to quickly and effectively control the temperature of the raw materials in the kettle 100 only by the temperature control system 200. The present invention specially arranges an internal circulation stirring system 300 in full consideration of production cost, design difficulty and subsequent maintenance.

[0048] like Figure 3 As shown, specifically, the internal circulation stirring system 300 includes: a rotating sleeve 310, a lifting spiral sheet 320, and a pressing spiral sheet 330. The rotating sleeve 310 is rotatably arranged in the kettle body 100, and the rotating axis of the rotating sleeve 310 is located on the same straight line as the central axis of the kettle body 100. The interior of the rotating sleeve 310 forms a raw material ascending channel 500 (such as Figure 1 A raw material sinking channel 600 is formed between the wall of the rotating sleeve 310 and the inner wall of the kettle body 100 (as shown in FIG. Figure 1 As shown in the figure, the lifting spiral piece 320 is arranged on the inner wall of the rotating sleeve 310, and the pressing spiral piece 330 is arranged on the outer wall of the rotating sleeve 310.

[0049] like Figure 3As shown, the internal circulation stirring system 300 also includes a stirring driving unit 340 for driving the rotating sleeve 310 to rotate. Specifically, the stirring driving unit 340 includes a driving shaft 341 and a driving motor 342 connected to the driving shaft 341; the driving motor 342 is arranged outside the top end 110 of the kettle body 100, and the driving shaft 341 is rotatably arranged inside the kettle body 100; the rotating axis of the driving shaft 341 is located on the same straight line as the central axis of the kettle body 100, the lifting spiral piece 320 extends from the bottom end 120 of the kettle body 100 to the top end 110, the driving shaft 341 is plugged and fixed on the lifting spiral piece 320, and the driving shaft 341 drives the rotating sleeve 310 to rotate through the lifting spiral piece 320. The pressing spiral piece 330 spirally surrounds the outer cylinder wall of the rotating sleeve 310, and the pressing spiral piece 330 extends from the top end 110 of the kettle body 100 to the bottom end 120.

[0050] It should be particularly noted that the driving motor 342 drives the driving shaft 341 to rotate in a single direction, and the driving shaft 341 drives the rotating sleeve 310 to rotate in a single direction through the lifting spiral plate 320. Since the spiral directions of the lifting spiral plate 320 and the pressing spiral plate 330 are arranged in opposite directions, the lifting spiral plate 320 can lift the raw materials in the kettle body 100 from the bottom end 120 to the top end 110 along the raw material rising channel, and the pressing spiral plate 330 just presses the raw materials at the top end 110 from the top end 110 to the bottom end 120 along the raw material pressing channel, thereby forming an internal circulation of the raw materials. It is worth noting that in order to increase the speed of temperature conduction, during the design, it is necessary to make the gap between the barrel wall of the rotating sleeve 310 and the inner wall of the kettle body 100 as small as possible, which will make it difficult for the raw materials to pass smoothly through the raw material sinking channel. At this time, the role of the downward pressing spiral blade 330 is revealed. When the downward pressing spiral blade 330 rotates with the rotating sleeve 310, the downward pressing spiral blade 330 will force the raw materials to be squeezed downward along the raw material sinking channel in an extrusion manner, thereby solving the problem of the raw materials passing smoothly through the narrow raw material sinking channel.

[0051] In this embodiment, the lifting spiral piece 320 is made of a rigid material, and the pressing spiral piece 330 is made of a flexible material, and the edge of the pressing spiral piece 330 is against the inner wall of the kettle body 100. The lifting spiral piece 320 is made of a rigid material, which has higher stability and can effectively lift the raw materials; while the pressing spiral piece 330 is made of a flexible material, and its edge is against the inner wall of the kettle body 100. During the spiral rotation of the pressing spiral piece 330, its edge can effectively scrape the raw materials on the inner wall of the kettle body 100 to prevent the raw materials from hanging on the wall. In addition, the raw materials mainly sink under the action of gravity, and there is no need for the pressing spiral piece 330 made of a flexible material to provide a huge lifting force. It is also very appropriate to set the pressing spiral piece 330 to be a flexible material.

[0052] like Figure 2As shown, specifically, the external circulation conveying system 400 includes an external circulation conveying pipe 410 and a discharge pipe 420, the two ends of the external circulation conveying pipe 410 are respectively connected with the bottom end 120 and the top end 110 of the kettle body 100, the external circulation conveying pipe 410 is provided with a first valve 430 near the bottom end 120 of the kettle body 100, the external circulation conveying pipe 410 is provided with a second valve 440 near the top end 110 of the kettle body 100, the discharge pipe 420 is communicated with the external circulation conveying pipe 410 and is located between the first valve 430 and the second valve 440, and the discharge pipe 420 is provided with a third valve 450. Further, the external circulation conveying pipe 410 is provided with a double-layer homogenizing pump 460 and an ultrasonic generator 470. During the saponification, dehydration, high-temperature refining, and blending stages, the double-layer homogenizing pump 460 is started to homogenize the raw materials, and the ultrasonic generator 470 is started to disperse the raw materials. The raw materials in the kettle body 100 pass through the external circulation conveying pipe 410, and the raw materials in the kettle body 100 reach the top end 110 from the bottom end 120 of the kettle body 100, and then flow back into the kettle body 100 from the top end 110.

[0053] like Figure 4 As shown, the present invention also discloses a method for preparing special grease for high-temperature bearings, which is implemented based on the above-mentioned special grease stirring and conveying device 10 for high-temperature bearings, and includes the following steps:

[0054] Step 1: heating and stirring, putting synthetic base oil, boron nitride, and complex lithium soap thickener into the kettle body, starting the temperature control system to heat the raw materials in the kettle body, starting the internal circulation stirring system to stir the raw materials in the kettle body, starting the external circulation conveying system, opening the first valve and the second valve, and closing the third valve, so that the raw materials are conveyed from the bottom end of the kettle body to the top end along the external circulation conveying pipe; in this step, starting the internal circulation stirring system 300, the stirring drive unit 340 drives the rotating sleeve 310 to rotate in a single direction, the lifting spiral piece 320 lifts the raw materials from the bottom end to the top end of the kettle body 100 along the raw material rising channel, and the pressing spiral piece 330 presses the raw materials from the top end to the bottom end of the kettle body 100 along the raw material sinking channel;

[0055] Step 2: heat preservation: start the temperature control system to keep the raw materials in the kettle warm;

[0056] Step three, heating and stirring, adding oiliness agent butyl oleate, metal deactivator, and auxiliary antioxidant into the kettle, starting the temperature control system to heat the raw materials in the kettle, starting the internal circulation stirring system to stir the raw materials in the kettle, starting the external circulation conveying system, opening the first valve and the second valve, and closing the third valve, so that the raw materials are conveyed from the bottom end to the top end of the kettle along the external circulation conveying pipe; in this step, starting the internal circulation stirring system 300, the stirring driving part 340 drives the rotating sleeve 310 to rotate in a single direction, the lifting spiral piece 320 lifts the raw materials from the bottom end to the top end of the kettle 100 along the raw material rising channel, and the pressing spiral piece 330 presses the raw materials from the top end to the bottom end of the kettle 100 along the raw material sinking channel;

[0057] Step 4: Cooling down: starting the temperature control system to cool down the raw materials in the kettle;

[0058] Step five, discharging, close the second valve, open the first valve and the third valve, so that the raw materials in the kettle body are discharged along the external circulation conveying pipe and the discharging pipe.

[0059] Here, it should be noted that during the preparation process, the timing of starting and shutting down the temperature control system 200, the internal circulation stirring system 300, and the external circulation conveying system 400 needs to be adaptively controlled according to the actual situation. For example, before refining, the temperature control system 200 can be set to set the heating rate, refining temperature, and insulation time; during refining, the internal circulation stirring system 300 can be set to set its stirring speed and time, and determine whether to add inert gas according to the process and product performance requirements until the refining is completed; when adding base oil, the stirring speed and stirring time can be reset, and the temperature control system 200 can be started to cool the raw materials in the kettle to achieve a blending reaction, thereby cooling down to a suitable temperature, and adding additives and other substances adaptively; the external circulation conveying system 400 can be activated in a timely manner. 0, the raw materials are transported from the bottom end to the top end of the kettle body 100 along the outer circulation conveying pipe 410. During this process, the raw materials will pass through the double-layer homogenizing pump 460 and the ultrasonic generator 470, and the double-layer homogenizing pump 460 will homogenize the raw materials, and the ultrasonic generator 470 will disperse the raw materials; finally, the temperature control system 200 and the inner circulation stirring system 300 are turned off, the second valve 440 is closed, the first valve 430 and the third valve 450 are opened, the ultrasonic generator 470 is turned off, and the double-layer homogenizing pump 460 is started, so that the raw materials in the kettle body 100 are discharged along the outer circulation conveying pipe 410 and the discharge pipe 420.

[0060] like Figure 5 As shown, the present invention also discloses a special grease for high-temperature bearings, which is prepared based on the above-mentioned special grease for high-temperature bearings preparation method, and the component ratio is calculated by weight, including the following components:

[0061] 60-80 parts of synthetic base oil, 1-5 parts of boron nitride, 10-15 parts of complex lithium soap thickener, 5-10 parts of oiliness agent butyl oleate, 1-5 parts of metal deactivator, and 1-5 parts of auxiliary antioxidant.

[0062] Wherein, the auxiliary antioxidant includes phosphite, thiodipropionate and mercaptan.

[0063] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A high-temperature bearing grease stirring and conveying device, characterized in that: include: Kettle body, temperature control system, internal circulation stirring system, external circulation conveying system; The kettle body is placed obliquely, the central axis of the kettle body is not perpendicular to the horizontal plane, and the kettle body has a top end and a bottom end; The temperature control system is arranged on the outer wall of the kettle body; The internal circulation stirring system comprises: a rotating sleeve, a lifting spiral sheet, and a pressing spiral sheet; the rotating sleeve is rotatably arranged in the kettle body, the rotating shaft of the rotating sleeve and the central axis of the kettle body are located on the same straight line, the interior of the rotating sleeve forms a raw material ascending channel, and the cylinder wall of the rotating sleeve and the inner wall of the kettle body form a raw material sinking channel, the lifting spiral sheet is arranged on the inner cylinder wall of the rotating sleeve, and the pressing spiral sheet is arranged on the outer cylinder wall of the rotating sleeve; the internal circulation stirring system also comprises a stirring driving part for driving the rotating sleeve to rotate; The external circulation conveying system includes an external circulation conveying pipe and a discharge pipe, the two ends of the external circulation conveying pipe are respectively connected with the bottom end and the top end of the kettle body, the external circulation conveying pipe is provided with a first valve near the bottom end of the kettle body, and the external circulation conveying pipe is provided with a second valve near the top end of the kettle body, the discharge pipe is connected with the external circulation conveying pipe and is located between the first valve and the second valve, and the discharge pipe is provided with a third valve.

2. The stirring and conveying device for high temperature bearing grease according to claim 1 is characterized in that: The stirring driving part includes a driving shaft and a driving motor connected to the driving shaft; the driving motor is arranged outside the top end of the kettle body, and the driving shaft is rotatably arranged inside the kettle body; The rotating axis of the driving shaft is located on the same straight line as the central axis of the kettle body, the lifting spiral piece extends from the bottom end to the top end of the kettle body, the driving shaft is plugged into and fixed on the lifting spiral piece, and the driving shaft drives the rotating sleeve to rotate through the lifting spiral piece.

3. The stirring and conveying device for high temperature bearing grease according to claim 2 is characterized in that: The downward pressing spiral sheet spirally surrounds the outer cylinder wall of the rotating sleeve, and the downward pressing spiral sheet extends from the top end to the bottom end of the kettle body.

4. The stirring and conveying device for high temperature bearing grease according to any one of claims 1 to 3, characterized in that: The lifting spiral blade is made of a rigid material, and the pressing spiral blade is made of a flexible material; The edge of the downward pressing spiral piece is pressed against the inner wall of the kettle body.

5. The stirring and conveying device for high temperature bearing grease according to claim 1 is characterized in that: The outer circulation conveying pipe is provided with a double-layer homogenizing pump and an ultrasonic generator.

6. The stirring and conveying device for high temperature bearing grease according to claim 1 is characterized in that: The temperature control system comprises a wrapping sleeve, the wrapping sleeve is wrapped around the outer wall of the kettle body, and a sandwich is formed between the wrapping sleeve and the outer wall of the kettle body; The wrapping sleeve has a liquid inlet and a liquid outlet which are communicated with the interlayer.

7. The stirring and conveying device for high temperature bearing grease according to claim 1 is characterized in that: A kettle cover is arranged on the top of the kettle body.

8. A method for preparing special grease for high-temperature bearings, characterized in that: The high-temperature bearing grease stirring and conveying device according to any one of claims 1 to 7 comprises the following steps: Step 1: Add synthetic base oil, boron nitride, and composite lithium soap thickener into the kettle, start the temperature control system to heat the raw materials in the kettle, start the internal circulation stirring system to stir the raw materials in the kettle, start the external circulation conveying system, open the first valve and the second valve, and close the third valve, so that the raw materials are conveyed from the bottom end of the kettle to the top end along the external circulation conveying pipe; Step 2, starting the temperature control system to keep the raw materials in the kettle warm; Step 3: Adding the oiliness agent butyl oleate, the metal deactivator, and the auxiliary antioxidant into the kettle, starting the temperature control system to heat the raw materials in the kettle, starting the internal circulation stirring system to stir the raw materials in the kettle, starting the external circulation conveying system, opening the first valve and the second valve, and closing the third valve, so that the raw materials are conveyed from the bottom end of the kettle to the top end along the external circulation conveying pipe; Step 4, starting the temperature control system to cool the raw materials in the kettle; Step five, discharging, close the second valve, open the first valve and the third valve, so that the raw materials in the kettle body are discharged along the external circulation conveying pipe and the discharging pipe.

9. A special grease for high temperature bearings, characterized in that: The high-temperature bearing grease is prepared based on the preparation method of claim 8, and the component ratio is calculated by weight, including the following components: 60-80 parts of synthetic base oil, 1-5 parts of boron nitride, 10-15 parts of complex lithium soap thickener, 5-10 parts of oiliness agent butyl oleate, 1-5 parts of metal deactivator, and 1-5 parts of auxiliary antioxidant.

10. The high temperature bearing grease according to claim 9, characterized in that: The secondary antioxidants include phosphites, thiodipropionates and mercaptans.

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