Barrel body mechanism of sand mill

Abstract

The utility model discloses a barrel body mechanism of a sand mill. The barrel body mechanism of the sand mill comprises a first grinding inner barrel, a discharging inner barrel, a first grinding outer barrel and a discharging outer barrel, the discharging inner barrel is arranged on the circumferential wall of the first grinding inner barrel and communicates with the first grinding inner barrel, the axis of the discharging inner barrel and the axis of the first grinding inner barrel deviate by a preset distance in the horizontal direction, the discharging inner barrel and the first grinding inner barrel are integrally formed, and the discharging inner barrel is used for containing a discharging mechanism. The first grinding outer barrel is arranged on the first grinding inner barrel in a wrapping mode, the first grinding outer barrel is provided with a first cooling interlayer, a first inlet and a first outlet are formed in the peripheral wall of the first grinding outer barrel, and the first inlet and the first outlet are used for circulation of cooling liquid; and the discharging outer barrel is arranged on the discharging inner barrel in a wrapping mode, a second cooling interlayer is arranged on the peripheral wall of the discharging outer barrel, a second inlet and a second outlet are formed in the peripheral wall of the discharging outer barrel, and the second inlet and the second outlet are used for circulation of cooling liquid.

Description

TECHNICAL FIELD

[0001] The utility model relates to a grinding and dispersing equipment technical field, especially relates to a barrel body mechanism of sand mill. BACKGROUND

[0002] The horizontal sand mill is a continuous operation full-closed wet grinding and dispersing machine, liquid raw materials are delivered by a pump into the closed grinding barrel of the horizontal sand mill, the grinding barrel is provided with grinding beads as grinding medium, and the pin rod on the grinding rotor drives the grinding beads to rotate at high speed, so that the liquid raw materials are ground in the narrow gap between the grinding beads.

[0003] At present, the discharge port of the horizontal sand mill is generally arranged at the axial end of the grinding barrel, and the axial direction of the discharge port is provided with a discharge mechanism, since the slurry in the grinding barrel is in a turbulent state, the material and the grinding medium will collide with the discharge mechanism, causing the grinding medium to block the discharge port, and since the temperature of the ground material is high, the use is not convenient. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving one of the technical problems in the prior art. To this end, the utility model provides a barrel body mechanism of sand mill, which can avoid blockage and reduce the discharge temperature.

[0005] The barrel body mechanism of sand mill according to the utility model embodiment comprises a barrel main body, the barrel main body comprises two barrel segments, the axis lines of the two barrel segments are in different planes and are arranged at a predetermined included angle in the normal plane projection, a wear-resistant layer is arranged in the barrel main body, and a cooling structure is arranged on the outer wall of the barrel main body and used for cooling the barrel main body.

[0006] The barrel main body has two barrel segments, grinding and discharging are carried out in different directions by the two barrel segments, the discharge port is arranged in the axial direction of the grinding barrel, the grinding medium is prevented from blocking the discharge port or the discharge mechanism, the wear-resistant layer is arranged to improve the wear resistance of the barrel main body, and the grinding effect of the barrel main body can be ensured after the barrel main body is applied.

[0007] According to some embodiments of the present application, the barrel body comprises a first grinding inner barrel, a discharging inner barrel, a first grinding outer barrel and a discharging outer barrel, the first grinding inner barrel is configured to accommodate a grinding rotor and material to be ground; the discharging inner barrel is arranged on the peripheral wall of the first grinding inner barrel, the discharging inner barrel is communicated with the first grinding inner barrel, the axis of the discharging inner barrel is out of the plane with the axis of the first grinding inner barrel, and the two axes are arranged at a predetermined included angle in the normal plane projection, and the discharging inner barrel is used for accommodating a discharging mechanism; the first grinding outer barrel is arranged on the first grinding inner barrel in a cladding manner; the discharging outer barrel is arranged on the discharging inner barrel in a cladding manner, and the discharging outer barrel is connected with the first grinding outer barrel; the cooling structure comprises a first cooling interlayer arranged on the first grinding outer barrel and a second cooling interlayer arranged on the discharging outer barrel, and the first cooling interlayer and the second cooling interlayer are both used for circulating cooling liquid; the first grinding inner barrel and the first grinding outer barrel constitute one of the two barrel segments, and the discharging inner barrel and the discharging outer barrel constitute the other of the two barrel segments. The first grinding inner barrel and the discharging inner barrel are integrally formed, so that the overall structure formed by the two has high structural strength, the axis of the discharging inner barrel deviates from the axis of the first grinding inner barrel by a predetermined distance in the horizontal direction, and the discharging inner barrel is arranged on the peripheral wall of the first grinding inner barrel, so that the first grinding inner barrel no longer has a discharge port in the axial direction, avoiding the problem of blockage of axial discharge, and because the discharging inner barrel deviates from the axis of the first grinding inner barrel, it can prevent the grinding rotor from throwing the grinding medium through the discharging inner barrel into the discharging mechanism during grinding, preventing blockage; in addition, the cooling structure ensures that the material can be cooled during grinding and discharging.

[0008] According to some embodiments of the present application, the discharging inner barrel is arranged in a shape narrowing from bottom to top or from top to bottom, and narrowing from top to bottom forms a funnel shape, which is more conducive to discharging, and the shape narrowing from bottom to top enables the grinding balls to quickly contact the inner wall of the discharging inner barrel during upward throwing, so that the grinding balls quickly flow back, avoiding blockage of the discharging mechanism.

[0009] According to some embodiments of the present application, the discharging inner barrel is arranged in a shape narrowing from bottom to top or from top to bottom, and narrowing from top to bottom forms a funnel shape, which is more conducive to discharging, and the shape narrowing from bottom to top enables the grinding balls to quickly contact the inner wall of the discharging inner barrel during upward throwing, so that the grinding balls quickly flow back, avoiding blockage of the discharging mechanism.

[0010] According to some embodiments of the utility model, first inlet and first outlet are arranged on the first grinding outer barrel, the first inlet and the first outlet are communicated with the first cooling layer, the outer peripheral wall of the discharge outer barrel is provided with second inlet and second outlet, the second inlet and the second outlet are communicated with the second cooling layer, the first cooling layer and the second cooling layer are used for containing cooling liquid, the setting structure of cooling layer is simple, convenient to realize, and has large contact area and high cooling efficiency.

[0011] According to some embodiments of the utility model, the first grinding inner barrel and the discharge inner barrel are connected through the first connecting neck, the discharge outer barrel is connected with the first grinding outer barrel through the second connecting neck, the second connecting neck is matched with the first connecting neck, the first connecting neck connects the first grinding inner barrel and the discharge inner barrel as a whole, and the structure of the first connecting neck enables the material in the first grinding inner barrel to be stably discharged, reducing blockage.

[0012] According to some embodiments of the utility model, the first connecting neck comprises a first connecting section and a second connecting section, one end of the first connecting section is connected with the peripheral wall of the first grinding inner barrel, the other end of the first connecting section is connected with one end of the second connecting section, the second connecting section is taperingly expanded from one end to the other end, the other end of the second connecting section is connected with the discharge inner barrel, and the second connecting neck is matched with the first connecting section and the second connecting section.

[0013] According to some embodiments of the utility model, a cover body is further included, the cover body is provided with a plugging part on the side close to the first grinding inner barrel, the cover body is connected with one end of the first grinding outer barrel, and the plugging part is configured to abut against the end wall of the first grinding inner barrel.

[0014] According to some embodiments of the utility model, a first annular mounting groove is arranged on the plugging part, the first annular mounting groove is used for mounting a first sealing ring, the first sealing ring is used for abutting against the end wall of the first grinding inner barrel, and the first sealing ring is arranged to seal one end of the first grinding inner barrel.

[0015] According to some embodiments of the utility model, a first flange is arranged on the end of the discharge outer barrel away from the first grinding outer barrel, and the first flange is used for fixedly connecting a discharging mechanism.

[0016] According to some embodiments of the utility model, still include grind extension bucket, the grind extension bucket includes second grind inner bucket and second grind outer bucket, the second grind outer bucket is covered and is established on the second grind inner bucket, the third cooling interlayer is provided with on the peripheral wall of second grind outer bucket, the third import and the third export are provided with on the peripheral wall of second grind outer bucket, the third import and the third export are used for the circulation cooling liquid, the second flange is provided with on the other end of first grind outer bucket, one end of second grind outer bucket is provided with third flange, the second flange is used for with third flange connects, the other end of first grind inner bucket abuts one end of second grind inner bucket, second annular mounting groove is provided with on third flange, second annular mounting groove is used for installing second sealing ring, second sealing ring is used for abutting second flange, the grind extension bucket is established, make the barrel body mechanism of whole sand mill can be conveniently disassembled.

[0017] According to some embodiments of the utility model, the first grind inner bucket, the discharge inner bucket and the second grind inner bucket are made of wear-resistant material, the wear-resistant material includes zirconium oxide, silicon carbide, polyurethane, aluminum oxide, aluminum nitride, silicon nitride, boron nitride or tungsten carbide, the first grind outer bucket, the discharge outer bucket and the second grind outer bucket are made of metal material.

[0018] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further explained in combination with the drawings and examples, wherein:

[0020] Figure 1 It is structure schematic drawing that the sand mill barrel body structure of the utility model embodiment is installed on the sand mill;

[0021] Figure 2 It is structure schematic drawing of the sand mill barrel body structure of the utility model embodiment;

[0022] Figure 3 It is the explosion drawing of the sand mill barrel body structure of the utility model embodiment;

[0023] Figure 4 It is the sectional view after explosion of the sand mill barrel body structure of the utility model embodiment;

[0024] Figure 5 It is structure schematic of the sand mill barrel body structure of the utility model embodiment removes grind extension bucket Figure 1 ;

[0025] Figure 6The sand mill barrel body structure removes the structure of the grinding extension barrel Figure 2 ;

[0026] Figure 7 The shaft section of the sand mill barrel body structure is shown in the schematic view.

[0027] Reference signs:

[0028] The barrel main body 100a, the cooling structure 100b;

[0029] The first grinding inner barrel 100, the grinding rotor 110;

[0030] The discharge inner barrel 200;

[0031] The first grinding outer barrel 300, the first inlet 310;

[0032] The first outlet 320, the first cooling layer 330, the second flange 340, the receiving table 350, the second connecting hole 351;

[0033] The discharge outer barrel 400, the second inlet 410, the second outlet 420, the second cooling layer 430, the first flange 440;

[0034] The first connecting neck 500, the first connecting section 510, the second connecting section 520;

[0035] The second connecting neck 600, the cover body 700, the first connecting hole 710;

[0036] The plugging part 720, the first annular mounting groove 721;

[0037] The grinding extension barrel 800, the second grinding inner barrel 810;

[0038] The second grinding outer barrel 820, the third inlet 821, the third outlet 822, the cooling layer 823, the third flange 824, the second annular mounting groove 825;

[0039] The discharge mechanism 900. DETAILED DESCRIPTION

[0040] In the description of the present application, it should be understood that, in relation to the position description, for example, the position or location relationship indicated by the upper, lower, front, rear, left, right and the like is based on the position or location relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application.

[0041] In the description of the utility model, if it is described to first, second is only used for distinguishing technical feature for purpose, and can not be understood as indicating or suggesting relative importance or implicitly indicating the quantity of indicated technical feature or implicitly indicating the precedence relation of indicated technical feature.

[0042] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be understood broadly, and the specific meaning of the above words in the utility model can be determined by the person skilled in the art in combination with the specific content of technical scheme.

[0043] Referring to Figures 1 to 7 According to the barrel body mechanism of the sand mill, the barrel body 100a includes two barrel segments, the axes of the two barrel segments are in different planes and are arranged at a predetermined included angle in the normal plane projection, the barrel body 100a is provided with a wear-resistant layer, and the outer wall of the barrel body 100a is provided with a cooling structure 100b, and the cooling structure 100b is used for cooling the barrel body 100a. It should be understood that the barrel body 100a has two barrel segments, and the two barrel segments are extended separately to make grinding and discharging in different directions, so that the discharge port is arranged in the axial direction of the grinding barrel, the discharge port or the discharging mechanism is prevented from being blocked by the grinding medium, the wear-resistant layer is arranged to improve the wear resistance of the barrel body 100a, and the grinding effect of the barrel body 100a can be ensured under the premise of not being blocked.

[0044] Referring to Figures 2 to 7 The barrel body 100a includes a first grinding inner barrel 100, a discharging inner barrel 200, a first grinding outer barrel 300 and a discharging outer barrel 400, the first grinding inner barrel 100 is configured to accommodate a grinding rotor 110 and material to be ground, the discharging inner barrel 200 is arranged on the peripheral wall of the first grinding inner barrel 100, the discharging inner barrel 200 is communicated with the first grinding inner barrel 100, the axis of the discharging inner barrel 200 is in a different plane from the axis of the first grinding inner barrel 100, and the two axes are arranged at a predetermined included angle in the normal plane projection, and the discharging inner barrel 200 is used for accommodating a discharging mechanism 900.

[0045] Referring to Figure 4 And Figure 7The first grinding outer barrel 300 is arranged on the first grinding inner barrel 100 in a cladding manner; the discharge outer barrel 400 is arranged on the discharge inner barrel 200 in a cladding manner, and the discharge outer barrel 400 is connected to the first grinding outer barrel 300; the cooling structure 100b comprises a first cooling layer 330 arranged on the first grinding outer barrel 300 and a second cooling layer 430 arranged on the discharge outer barrel 400, and the first cooling layer 330 and the second cooling layer 430 are both used for flowing cooling liquid; the first grinding inner barrel 100 and the first grinding outer barrel 300 constitute one of the two barrel sections, and the discharge inner barrel 200 and the discharge outer barrel 400 constitute the other of the two barrel sections.

[0046] It should be understood that the first grinding inner barrel 100 and the discharge inner barrel 200 are arranged in an integrated manner, so that the structural strength of the whole formed by the two is higher, and the axis of the discharge inner barrel 200 deviates from the axis of the first grinding inner barrel 100 by a predetermined distance in the horizontal direction, and the discharge inner barrel 200 is arranged on the peripheral wall of the first grinding inner barrel 100, which makes the axis of the first grinding inner barrel 100 no longer have a discharge port, avoiding the problem of blockage of axial discharge, and because the discharge inner barrel 200 deviates from the axis of the first grinding inner barrel 100, it can prevent the grinding rotor 110 from throwing the grinding medium through the discharge inner barrel 200 into the discharge mechanism 900 during the grinding process, preventing blockage. In addition, the first grinding outer barrel 300 and the discharge outer barrel 400 are respectively provided with the first cooling layer 330 and the second cooling layer 430, which ensures that the material can be cooled during the grinding process and the discharging process. It can be understood that, due to the arrangement relationship deviating by a predetermined distance, the grinding rotor 110 is not easy to cause blockage by throwing the grinding medium during the grinding process.

[0047] It should be noted that the axis of the discharge inner barrel 200 and the axis of the first grinding inner barrel 100 can be arranged in a non-planar vertical manner, or can form a certain angle.

[0048] In some embodiments, the discharge inner barrel 200 is arranged in a narrowing shape from bottom to top or a narrowing shape from top to bottom. The narrowing shape from top to bottom forms a funnel shape, which is more conducive to discharging. The narrowing shape from bottom to top enables the grinding balls to quickly contact the inner wall of the discharge inner barrel 200 during the upward throwing process, so that the grinding balls quickly return, avoiding blockage of the discharge mechanism 900. It should be noted that the narrowing can be gradual narrowing or can be narrowing with a stepped form, as long as the whole presents a narrowing diameter.

[0049] In some embodiments, the discharge inner barrel 200 is configured in a shape that narrows upward from the middle and narrows downward from the middle. It can be understood that this shape is similar to an olive shape or a shuttle shape, which is large in the middle and small at both ends, and the purpose is to have the functions of smooth discharging and grinding ball return.

[0050] It is to be noted that the shape of the discharge inner barrel 200 is not limited to the two, and the discharge inner barrel 200 includes a cylindrical straight barrel, a barrel with a certain degree of bending, a flexible barrel, an elastic barrel, and the like.

[0051] With reference to Figure 4 and Figure 7 , the first grinding outer barrel 300 is provided with a first inlet 310 and a first outlet 320, the first inlet 310 and the first outlet 320 are communicated with a first cooling layer 330, and the outer peripheral wall of the discharge outer barrel 400 is provided with a second inlet 410 and a second outlet 420, the second inlet 410 and the second outlet 420 are communicated with a second cooling layer 430, and the first cooling layer 330 and the second cooling layer 430 are used to accommodate cooling liquid, the cooling layer has a simple structure, is convenient to realize, has a large contact area, and has high cooling efficiency.

[0052] In some embodiments, the first grinding inner barrel 100 and the discharge inner barrel 200 are connected through a first connecting neck 500, and the discharge outer barrel 400 is connected with the first grinding outer barrel 300 through a second connecting neck 600, the second connecting neck 600 is abutted with the first connecting neck 500, the first connecting neck connects the first grinding inner barrel and the discharge inner barrel as a whole, and the structure of the first connecting neck enables the material in the first grinding inner barrel to be stably discharged and reduces blockage.

[0053] In some embodiments, the first connecting neck 500 includes a first connecting section 510 and a second connecting section 520, one end of the first connecting section 510 is connected with the peripheral wall of the first grinding inner barrel 100, the other end of the first connecting section 510 is connected with one end of the second connecting section 520, the second connecting section 520 is taperingly expanded from one end to the other end, and the other end of the second connecting section 520 is connected with the discharge inner barrel 200, and the second connecting neck 600 is abutted with the first connecting section 510 and the second connecting section 520.

[0054] In some embodiments, one end of the first grinding inner barrel is sealed, and the other end of the first grinding inner barrel is used to extend into the grinding rotor. The sealing is to provide a discharge space for the discharge inner barrel 200, so that the material can be discharged from the discharge inner barrel 200.

[0055] With reference to Figure 5 and Figure 6 , the cover body 700 is provided with a blocking part 720 close to one side of the first grinding inner barrel 100, the cover body 700 is connected to one end of the first grinding outer barrel 300, and the blocking part 720 is configured to abut against the end wall of the first grinding inner barrel 100.

[0056] In some embodiments, one end of the first grinding inner barrel 100 is sealed, and the other end of the first grinding inner barrel 100 is used to extend into the grinding rotor 110. It should be noted that the grinding rotor 110 is drivingly connected to the motor, and the motor is arranged on the sand mill.

[0057] With reference to Figure 5 And Figure 6 Further comprising a cover body 700, the cover body 700 is provided with a plurality of first connecting holes 710, the plurality of first connecting holes 710 are uniformly arranged around the circumference of the cover body 700, one end of the first grinding outer barrel 300 is provided with a receiving table 350, the receiving table 350 is provided with a plurality of second connecting holes 351, the second connecting holes 351 are arranged one by one corresponding to the first connecting holes 710, the cover body 700 is provided with a sealing portion 720 close to one side of the first grinding inner barrel 100, the sealing portion 720 is used to abut against the end wall of the first grinding inner barrel 100, the first connecting holes 710 and the second connecting holes 351 are used to pass through screws to fix the cover body 700, it can be understood that the cover body 700 is also provided with a discharge hole, the discharge hole is used to discharge the material in the first grinding inner barrel 100 after shutdown.

[0058] In some embodiments, the sealing portion 720 is provided with a first annular mounting groove 721, the first annular mounting groove 721 is used to mount a first sealing ring, the first sealing ring is used to abut against the end wall of the first grinding inner barrel 100, and the first sealing ring is arranged to seal one end of the first grinding inner barrel 100. It should be noted that the first sealing ring and the second sealing ring are not shown in the figure.

[0059] In some embodiments, the discharge outer barrel 400 is provided with a first flange 440 away from one end of the first grinding outer barrel 300, and the first flange 440 is used to fixedly connect the discharging mechanism 900.

[0060] With reference to Figures 2 to 4The grinding extension barrel 800 comprises a second grinding inner barrel 810 and a second grinding outer barrel 820, the second grinding outer barrel 820 is arranged on the second grinding inner barrel 810 in a cladding manner, a third cooling layer 823 is arranged on the peripheral wall of the second grinding outer barrel 820, and a third inlet 821 and a third outlet 822 are arranged on the peripheral wall of the second grinding outer barrel 820, the third inlet 821 and the third outlet 822 are used for circulating cooling liquid, the other end of the first grinding outer barrel 300 is provided with a second flange 340, one end of the second grinding outer barrel 820 is provided with a third flange 824, the second flange 340 is used for being connected with the third flange 824, the other end of the first grinding inner barrel 100 abuts against one end of the second grinding inner barrel 810, a second annular mounting groove 825 is arranged on the third flange 824, the second annular mounting groove 825 is used for mounting a second sealing ring, and the second sealing ring is used for abutting against the second flange 340, the grinding extension barrel 800 is arranged, so that the barrel body mechanism of the whole sand mill can be conveniently disassembled, and it can be understood that, after the grinding extension barrel 800 is connected with the first grinding outer barrel 300 through the flanges, the inner barrels of the two can be connected to form an integral whole, a gap between the second grinding inner barrel 810 and the first grinding inner barrel 100 is filled by a sealing gasket, or a square toothed matching structure can be arranged to reduce the influence of the connection gap.

[0061] In some embodiments, the first grinding inner barrel 100, the discharge inner barrel 200 and the second grinding inner barrel 810 are all made of wear-resistant materials, and the wear-resistant materials include zirconia, silicon carbide, polyurethane, aluminum oxide, aluminum nitride, silicon nitride, boron nitride or tungsten carbide, and the first grinding outer barrel 300, the discharge outer barrel 400 and the second grinding outer barrel 820 are all made of metal materials.

[0062] The technical features of the above embodiments can be combined in any manner, and for the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0063] Of course, the present application is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A barrel mechanism of a sander characterized by comprising: The application relates to a grinding barrel, which comprises: a barrel body (100a) comprising two barrel segments, the axes of the two barrel segments being arranged in different planes and being arranged at a predetermined included angle in the normal plane projection, the barrel body (100a) being provided with a wear-resistant layer, and the outer wall of the barrel body (100a) being provided with a cooling structure (100b) for cooling the barrel body (100a).

2. A barrel mechanism of a sander according to claim 1, wherein The barrel body (100a) comprises: a first grinding inner barrel (100) configured to accommodate a grinding rotor (110) and material to be ground; a discharge inner barrel (200) arranged on the peripheral wall of the first grinding inner barrel (100), the discharge inner barrel (200) being in communication with the first grinding inner barrel (100), the axis of the discharge inner barrel (200) being arranged in a different plane from the axis of the first grinding inner barrel (100) and the two axes being arranged at a predetermined included angle in the normal plane projection, and the discharge inner barrel (200) being configured to accommodate a discharge mechanism (900); a first grinding outer barrel (300) arranged in a cladding manner on the first grinding inner barrel (100); a discharge outer barrel (400) arranged in a cladding manner on the discharge inner barrel (200), the discharge outer barrel (400) being connected to the first grinding outer barrel (300); the cooling structure (100b) comprises a first cooling interlayer (330) arranged on the first grinding outer barrel (300) and a second cooling interlayer (430) arranged on the discharge outer barrel (400), and the first cooling interlayer (330) and the second cooling interlayer (430) are both used for flowing cooling liquid; the first grinding inner barrel (100) and the first grinding outer barrel (300) constitute one of the two barrel segments, and the discharge inner barrel (200) and the discharge outer barrel (400) constitute the other of the two barrel segments.

3. A barrel mechanism of a sander according to claim 2, wherein The discharge inner barrel is arranged in a narrowing shape from bottom to top or a narrowing shape from top to bottom.

4. A barrel mechanism of a sander according to claim 2, wherein The discharge inner barrel is arranged in a narrowing shape from the middle upwards and from the middle downwards.

5. A barrel mechanism for a sander as claimed in claim 4, wherein The first grinding inner barrel (100) and the discharge inner barrel (200) are connected through a first connecting neck (500), and the discharge outer barrel (400) and the first grinding outer barrel (300) are connected through a second connecting neck (600), and the second connecting neck (600) is in abutment with the first connecting neck (500).

6. A barrel mechanism for a sander as claimed in claim 5, wherein The first connecting neck (500) comprises a first connecting segment (510) and a second connecting segment (520), one end of the first connecting segment (510) is connected to the peripheral wall of the first grinding inner barrel (100), the other end of the first connecting segment (510) is connected to one end of the second connecting segment (520), the second connecting segment (520) is arranged in a tapering expansion manner from one end to the other end, the other end of the second connecting segment (520) is connected to the discharge inner barrel (200), and the second connecting neck (600) is in abutment with the first connecting segment (510) and the second connecting segment (520).

7. A barrel mechanism for a sander as claimed in claim 6, wherein Further comprising a cover (700), wherein a sealing part (720) is arranged on one side of the first grinding inner barrel (100), the cover (700) is connected to one end of the first grinding outer barrel (300), and the sealing part (720) is configured to abut against the end wall of the first grinding inner barrel (100).

8. A barrel mechanism of a sander according to claim 7, wherein A first annular mounting groove (721) is arranged on the sealing part (720), and the first annular mounting groove (721) is used for mounting a first sealing ring, and the first sealing ring is used for abutting against the end wall of the first grinding inner barrel (100).

9. A barrel mechanism for a sander as defined in claim 8, wherein The discharge outer barrel (400) is provided with a first flange (440) at one end away from the first grinding outer barrel (300), and the first flange (440) is used for fixedly connecting the discharging mechanism (900).

10. A barrel mechanism for a sander according to claim 8 or 9, characterized in that Further comprising a grinding extension barrel (800), wherein the grinding extension barrel (800) comprises a second grinding inner barrel (810) and a second grinding outer barrel (820), the second grinding outer barrel (820) is arranged on the second grinding inner barrel (810) in a cladding manner, a third cooling layer (823) is arranged on the peripheral wall of the second grinding outer barrel (820), a third inlet (821) and a third outlet (822) are arranged on the outer peripheral wall of the second grinding outer barrel (820), the third inlet (821) and the third outlet (822) are used for circulating cooling liquid, the other end of the first grinding outer barrel (300) is provided with a second flange (340), one end of the second grinding outer barrel (820) is provided with a third flange (824), the second flange (340) is used for being connected with the third flange (824), the other end of the first grinding inner barrel (100) abuts against one end of the second grinding inner barrel (810), and a second annular mounting groove (825) is arranged on the third flange (824), the second annular mounting groove (825) is used for mounting a second sealing ring, and the second sealing ring is used for abutting against the second flange (340).

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