Edge grinding machining device for low-density hard rubber parts

Abstract

The invention belongs to the technical field of part grinding machining, and particularly discloses a low-density hard rubber part edging machining device which comprises a two-way mixing grinding assembly and a base, the two-way mixing grinding assembly comprises a center main shaft, an inner ring auger and an outer ring auger, a center sleeve is arranged on the inner ring auger, and a center sleeve is arranged on the outer ring auger; the inner ring auger is fixedly connected to the center main shaft through the center sleeve, one end of the outer ring auger is provided with an end sealing plate, and the outer ring auger is fixedly connected to the center main shaft through the end sealing plate. The characteristic that the porous material is low in material density is utilized, it is guaranteed that the porous material is always located in the effective pushing range of the outer-ring auger, and workpieces are prevented from entering the action range of the inner-ring auger; in addition, according to the scheme, it is guaranteed that grinding materials in the charging barrel are evenly distributed and the total amount is stable in a grinding material recycling and bidirectional pushing mode, and therefore continuous throughput and grinding of the workpieces are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of low-density part grinding and processing, and in particular relates to a low-density hard rubber part edge grinding and processing device. Background Art

[0002] Low-density hard rubber materials mostly refer to hard rubber materials with holes inside. There is a foaming process in the molding process. Therefore, compared with traditional rubber materials, they have the characteristics of light weight and excellent impact resistance. Therefore, they are widely used as buffer separators such as sleeves, bushings, and cushions. Since the elasticity of this type of material is mainly achieved through a porous structure and the material itself is relatively hard, in order to avoid falling debris or scratches on the edges of parts during installation and use, the edges need to be polished before leaving the factory.

[0003] Because these parts are small and have different and complex shapes, traditional edge grinding devices not only have low grinding efficiency, but also require different programs and parameters to match parts of different specifications.

[0004] "Ball mill" is an efficient technical route suitable for this type of working condition, but ball mills are generally used to process metal parts with a density greater than or equal to that of the abrasive. Therefore, the abrasive can "grind" the workpiece, and the workpiece can be driven laterally through the grooves inside the ball mill. If a ball mill is used to process low-density materials, not only will the contact between the workpiece and the abrasive be insufficient, but the controllability of the workpiece movement will also be seriously insufficient. Summary of the Invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention proposes a low-density hard rubber part edge grinding processing device; this solution utilizes the low density of the "porous material" and places it in the flowing abrasive to ensure that it is always within the effective pushing range of the outer ring auger, avoiding the workpiece from entering the range of action of the inner ring auger; not only that, this solution ensures that the abrasive inside the barrel is evenly distributed and the total amount is stable through abrasive recovery and two-way pushing, thereby realizing continuous throughput and grinding of the workpiece.

[0006] In addition, in order to further improve the grinding effect, the present invention also provides an arc-shaped convex tube on the outer ring of the outer ring auger; the lateral friction of the arc-shaped convex tube can make the workpiece rotate, thereby ensuring that the outer surface of the workpiece can fully contact the abrasive; through the downward pressure of the protruding part of the arc-shaped convex tube, the workpiece can also be partially "immersed" in the abrasive, thereby increasing the surface area of ​​the workpiece in contact with the abrasive at the same time and improving the grinding efficiency.

[0007] The technical solution adopted by the present invention is as follows: The present invention proposes a low-density hard rubber part edging processing device, including a bidirectional mixed grinding assembly and a base, the bidirectional mixed grinding assembly includes a central spindle, an inner ring auger and an outer ring auger, the inner ring auger is provided with a central sleeve, the inner ring auger is fixed to the central spindle through the central sleeve, one end of the outer ring auger is provided with an end sealing plate, the outer ring auger is fixed to the central spindle through the end sealing plate, and the rotation of the central spindle can simultaneously drive the inner ring auger and the outer ring auger to rotate, the spiral directions of the blades of the inner ring auger and the outer ring auger are opposite, and the spiral blades of the inner ring auger and the outer ring auger do not overlap in the axial projection.

[0008] The inner and outer ring augers push the abrasive in opposite directions. Through the design of the inner and outer ring augers, the lateral movement speed of the abrasive in two directions can be balanced, thereby preventing the abrasive from accumulating toward one end. Since the rotation speed of the inner and outer ring augers is the same, the factors affecting the pushing effect mainly include: whether the blades are hollow, the axial projection area of ​​the blades, and the spiral distance of the blades.

[0009] The density of the abrasive is much greater than that of the porous material, and the abrasive particles are smaller in diameter, so the part sits on top of the abrasive while the abrasive remains fluid (similar to a liquid, but the abrasive is less fluid than the liquid).

[0010] Furthermore, the outer ring of the outer ring auger is also evenly distributed with arc-shaped convex tubes and connecting rods in a ring shape, wherein the number of connecting rods is less than the number of arc-shaped convex tubes, and the connecting rods are connected to the end sealing plates.

[0011] Since the workpiece "floats" on the upper surface of the abrasive, the lateral friction of the arc-shaped convex tube can make the workpiece rotate, thereby ensuring that the outer surface of the workpiece can fully contact the abrasive; the downward pressure of the protruding part of the arc-shaped convex tube can also make the workpiece partially "immerse" in the abrasive, thereby increasing the surface area of ​​the workpiece in contact with the abrasive at the same time and improving the grinding efficiency.

[0012] Preferably, the bidirectional mixing and grinding assembly also includes a barrel, which is arranged on a base, and the central spindle, inner ring auger and outer ring auger are all rotatably arranged in the barrel, the central spindle extends from one end of the barrel, and a main gear is provided on the end of the central spindle located outside the barrel, and the outer ring of the outer ring auger is in contact with the inner wall of the barrel.

[0013] The ground workpiece is discharged from the discharge port, and inevitably part of the abrasive is discharged together. This part of the abrasive is collected and can re-enter the barrel through the reflux port.

[0014] As a further preferred embodiment of the present invention, a feed port is provided at the top of one end of the barrel, and the length of the arc-shaped convex tube does not reach the feed port, so that the parts in the feed port can pass through the gap of the connecting rod and fall into the barrel. A discharge port is provided at the other end of the barrel, and a reflux port is provided below the discharge port, so that the abrasive that falls with the workpiece in the discharge port can re-enter the barrel through the reflux port.

[0015] Furthermore, it also includes a screening reflux component, which includes a collecting hood, side baffles and an arc-shaped screen. The collecting hood is fixed to the outside of the reflux port, the side baffles are fixed to the barrel, and the side baffles are located on both sides of the discharge port. One end of the arc-shaped screen is fixed to the barrel, and the other end of the arc-shaped screen is fixed to the collecting hood.

[0016] The workpiece and abrasive discharged from the discharge port can be screened by the screening reflux component.

[0017] Preferably, the lowest point of the arc-shaped screen is located above the collecting hood.

[0018] Furthermore, it also includes a rotating stopping assembly, which includes a stopping long shaft and a stopping wheel. An external boss is provided on the outside of the collection cover, and a through hole is provided on the external boss. The stopping long shaft is rotatably arranged in the through hole, and the stopping wheel is fixed to the stopping long shaft.

[0019] Preferably, the stopping wheel is composed of a plurality of independent wheels, and the arc-shaped screen is provided with straight screening grooves in an array, and the stopping wheel is located in the straight screening grooves.

[0020] Since abrasives are easily retained inside parts with medium holes, leaving the parts on the curved screen for a period of time and rotating them through the stopping wheel can discharge most of the abrasives inside the workpiece, thereby reducing the consumption of abrasives.

[0021] As a further preferred embodiment of the present invention, the rotation stopping assembly further comprises a stopping motor, the stopping motor is arranged on the external boss, and the output shaft of the stopping motor is connected to the stopping long shaft.

[0022] The blades of the outer ring auger are provided with a hollow portion which is larger than the diameter of the abrasive.

[0023] There are also arc-shaped upward curves on both sides of the curved screen, so that the workpiece can automatically slide towards the middle position when sliding along the curved screen.

[0024] The beneficial effects achieved by the present invention using the above structure are as follows: (1) The inner and outer ring auger push the abrasive in opposite directions. Through the design of the inner and outer ring auger, the lateral movement speed of the abrasive in two directions can be balanced, thereby preventing the abrasive from accumulating toward one end.

[0025] (2) The density of the abrasive is much greater than that of the porous material, and the diameter of the abrasive particles is smaller, so the part will be located on top of the abrasive if the abrasive remains flowing.

[0026] (3) Since the workpiece "floats" on the upper surface of the abrasive, the lateral friction of the arc-shaped convex tube can make the workpiece rotate, thereby ensuring that the outer surface of the workpiece can fully contact the abrasive; through the downward pressure of the protruding part of the arc-shaped convex tube, the workpiece can also be partially "immersed" in the abrasive, thereby increasing the surface area of ​​the workpiece in contact with the abrasive at the same time and improving the grinding efficiency.

[0027] (4) The ground workpiece is discharged from the discharge port. At this time, some abrasives will inevitably be discharged together. These abrasives will be collected and can re-enter the barrel through the reflux port.

[0028] (5) The workpiece and abrasive discharged from the discharge port can be screened by the screening reflux component.

[0029] (6) Since abrasives are easily retained inside parts with medium holes, the parts are left on the curved screen for a period of time and rotated by the stopping wheel. This can discharge most of the abrasives inside the workpiece, thereby reducing the consumption of abrasives.

[0030] (7) The blades of the outer ring auger are provided with a hollow portion larger than the diameter of the abrasive, which can further improve the grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A three-dimensional diagram of a low-density hard rubber part edge grinding device proposed by the present invention; Figure 2 This is a front view of a low-density hard rubber part edge grinding device proposed by the present invention; Figure 3 This is a left side view of a low-density hard rubber part edge grinding device proposed by the present invention; Figure 4 for Figure 3 A cross-sectional view along the cutting line AA; Figure 5 for Figure 4 A cross-sectional view along the cutting line BB; Figure 6 This is a schematic diagram of a half-section structure of a low-density hard rubber part edge grinding device proposed by the present invention; Figure 7 for Figure 1 A partial enlarged view of point Ⅰ in the middle; Figure 8 for Figure 4 A partial enlarged view of the middle II; Figure 9 This is a three-dimensional diagram of the outer ring auger; Figure 10 Schematic diagram of the movement direction of the workpiece and abrasive Figure 1 ; Figure 11 Schematic diagram of the movement direction of the workpiece and abrasive Figure 2 .

[0032] Among them, 1. Bidirectional mixing and grinding assembly, 2. Screening and reflux assembly, 3. Rotary stop assembly, 4. Base, 5. Central spindle, 6. Inner ring auger, 7. Outer ring auger, 8. Barrel, 9. Main gear, 10. Central sleeve, 11. Arc-shaped convex tube, 12. Connecting rod, 13. End sealing plate, 14. Feed inlet, 15. Discharge port, 16. Reflux port, 17. Collecting cover, 18. Side baffle, 19. Arc-shaped screen, 20. External boss, 21. Through hole, 22. Stop motor, 23. Stop long shaft, 24. Stop wheel.

[0033] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0036] like Figures 1 to 9As shown, the present invention proposes a low-density hard rubber part edging processing device, including a bidirectional mixed grinding component 1 and a base 4, the bidirectional mixed grinding component 1 includes a central spindle 5, an inner ring auger 6 and an outer ring auger 7, the inner ring auger 6 is provided with a central sleeve 10, the inner ring auger 6 is fixedly connected to the central spindle 5 through the central sleeve 10, one end of the outer ring auger 7 is provided with an end sealing plate 13, the outer ring auger 7 is fixedly connected to the central spindle 5 through the end sealing plate 13, and the rotation of the central spindle 5 can simultaneously drive the inner ring auger 6 and the outer ring auger 7 to rotate, the spiral directions of the blades of the inner ring auger 6 and the outer ring auger 7 are opposite, and the spiral blades of the inner ring auger 6 and the outer ring auger 7 do not overlap in the axial projection.

[0037] The inner ring auger 6 and the outer ring auger 7 push the abrasive in opposite directions. Through the design of the inner ring auger 6 and the outer ring auger 7, the lateral movement speed of the abrasive in two directions can be balanced, thereby avoiding the abrasive from accumulating toward one end; since the rotation speed of the inner ring auger 6 and the outer ring auger 7 is the same, the factors affecting the pushing effect mainly include: whether the blade is hollow, the axial projection area of ​​the blade, and the spiral distance of the blade.

[0038] The density of the abrasive is much greater than that of the porous material, and the abrasive particles are smaller in diameter, so the part sits on top of the abrasive while the abrasive remains fluid (similar to a liquid, but the abrasive is less fluid than the liquid).

[0039] The outer ring of the outer ring auger 7 is also evenly distributed with arc-shaped convex tubes 11 and connecting rods 12 in a ring shape, wherein the number of the connecting rods 12 is less than the number of the arc-shaped convex tubes 11 , and the connecting rods 12 are connected to the end sealing plates 13 .

[0040] Since the workpiece "floats" on the upper surface of the abrasive, the lateral friction of the arc-shaped convex tube 11 can make the workpiece rotate, thereby ensuring that the outer surface of the workpiece can fully contact the abrasive; through the downward pressure of the protruding part of the arc-shaped convex tube 11, the workpiece can also be partially "immersed" in the abrasive, thereby increasing the surface area of ​​the workpiece in contact with the abrasive at the same time and improving the grinding efficiency.

[0041] The bidirectional mixing and grinding assembly 1 also includes a barrel 8, which is arranged on the base 4. The central spindle 5, the inner ring auger 6 and the outer ring auger 7 are all rotatably arranged in the barrel 8. The central spindle 5 extends from one end of the barrel 8. A main gear 9 is provided on the end of the central spindle 5 located outside the barrel 8, and the outer ring of the outer ring auger 7 is in contact with the inner wall of the barrel 8.

[0042] The ground workpiece is discharged from the discharge port 15 , and inevitably part of the abrasive is discharged together. This part of the abrasive is collected and can re-enter the barrel 8 through the reflux port 16 .

[0043] A feed port 14 is provided at the top of one end of the barrel 8. The length of the arc-shaped convex tube 11 does not reach the feed port 14, so the parts in the feed port 14 can pass through the gap of the connecting rod 12 and fall into the barrel 8. A discharge port 15 is provided at the other end of the barrel 8, and a reflux port 16 is provided below the discharge port 15. The abrasive that falls with the workpiece in the discharge port 15 can re-enter the barrel 8 through the reflux port 16.

[0044] It also includes a screening reflux component 2, which includes a collecting hood 17, a side baffle 18 and an arc-shaped screen 19. The collecting hood 17 is fixed to the outside of the reflux port 16, and the side baffle 18 is fixed to the barrel 8. The side baffle 18 is located on both sides of the discharge port 15. One end of the arc-shaped screen 19 is fixed to the barrel 8, and the other end of the arc-shaped screen 19 is fixed to the collecting hood 17.

[0045] The workpiece and abrasive discharged from the discharge port 15 can be screened by the screening reflux assembly 2 .

[0046] The lowest point of the arc-shaped screen 19 is located above the collecting cover 17 .

[0047] It also includes a rotating stopping assembly 3, which includes a stopping long shaft 23 and a stopping wheel 24. An external boss 20 is provided on the outside of the collection cover 17, and a through hole 21 is provided on the external boss 20. The stopping long shaft 23 is rotatably arranged in the through hole 21, and the stopping wheel 24 is fixed to the stopping long shaft 23.

[0048] The stopping wheel 24 is composed of a plurality of independent wheels. Straight screening grooves are arranged in an array on the arc-shaped screen 19, and the stopping wheel 24 is located in the straight screening grooves.

[0049] Since abrasives are easily retained inside parts with medium holes, the parts are left on the arc screen 19 for a period of time and rotated by the stopping wheel 24, so that most of the abrasives inside the workpiece can be discharged, thereby reducing the consumption of abrasives.

[0050] The rotation stopping assembly 3 further includes a stopping motor 22 . The stopping motor 22 is disposed on the external boss 20 , and an output shaft of the stopping motor 22 is connected to the stopping long shaft 23 .

[0051] The blades of the outer ring auger 7 are provided with a hollow portion which is larger than the diameter of the abrasive.

[0052] There are also arc-shaped upward curves on both sides of the arc-shaped screen 19, so that the workpiece can automatically slide toward the middle position when sliding along the arc-shaped screen 19.

[0053] like Figure 10 As shown, the arrows inside the barrel 8 indicate the movement directions of the workpiece and the abrasive. Under the pushing action of the inner and outer auger rings 6 and 7, the abrasive in the central area A and the peripheral area B move in opposite directions. The double-line arrows outside the barrel 8 represent the movement trajectory and direction of the abrasive, and the single-line arrows outside the barrel 8 represent the movement trajectory and direction of the workpiece (above) and the rotation direction of the stop wheel 24 (below).

[0054] like Figure 11 As shown, area A represents the effective range of the inner ring auger 6, area B represents the effective range of the outer ring auger 7, and the horizontal dotted line represents the upper surface of the abrasive. Under the joint push of the abrasive and the outer ring auger 7, the workpiece will be pushed axially along a position biased to one side (the dotted circle represents the workpiece). At this time, the arc-shaped convex tube 11 moves the workpiece to rotate on the one hand (the direction of rotation is shown by the arc arrow), and on the other hand, squeezes the workpiece to sink toward the bottom of the dotted line (the pressing direction is shown by the straight arrow).

[0055] During specific use, the user first needs to start the stopping motor 22, and engage it with the main gear 9 through the external drive gear, and drive the central spindle 5 to rotate continuously through the external drive device. While the central spindle 5 rotates, it also drives the inner ring auger 6 and the outer ring auger 7 to rotate. Since the spiral directions of the blades of the inner ring auger 6 and the outer ring auger 7 are opposite, the inner ring auger 6 and the outer ring auger 7 push the abrasive in opposite directions; through the design of the inner ring auger 6 and the outer ring auger 7, the lateral movement speed of the abrasive in two directions can be balanced, thereby avoiding the accumulation of the abrasive toward one end; since the rotation speed of the inner ring auger 6 and the outer ring auger 7 is the same, the factors affecting the pushing effect mainly include: whether the blade is hollow, the axial projection area of ​​the blade, and the spiral distance of the blade.

[0056] Place the workpiece into the feed port 14, and the workpiece will fall into the barrel 8 under the action of its own weight. Since the length of the arc-shaped convex tube 11 does not extend to the bottom of the feed port 14, there are only sparse connecting rods 12 below the feed port 14. When there is no connecting rod 12 blocking the bottom of the feed port 14, the workpiece will fall into the barrel 8 smoothly.

[0057] Since the density of the "porous material" is much smaller than that of the abrasive, the workpiece will "float" on the upper surface of the abrasive when the abrasive remains fluid. The stirring of the inner ring auger 6 and the outer ring auger 7 can maintain the fluidity of the abrasive, thereby causing relative movement and friction between the abrasive and the workpiece. Through this disordered friction and impact, the surface of the workpiece can be ground.

[0058] During grinding, the blades of the outer ring auger 7 will also push the workpiece axially. Under the action of this thrust, the workpiece can stably move from the bottom of the feed port 14 to the discharge port 15 and fall from the discharge port 15.

[0059] At the same time, since the blades of the outer ring auger 7 are inclined, the workpiece will be offset to one side of the barrel 8 when moving. Therefore, even if the diameters of the workpieces are different, the top can be guaranteed to contact the arc-shaped convex tube 11. On the one hand, the arc-shaped convex tube 11 can rotate the workpiece through its own friction on the workpiece, thereby ensuring that the outer surface of the workpiece can fully contact the abrasive; through the downward pressure of the protruding part of the arc-shaped convex tube 11, the workpiece can also be partially "immersed" in the abrasive, thereby increasing the surface area of ​​the workpiece in contact with the abrasive at the same time and improving the grinding efficiency.

[0060] The ground workpiece falls onto the curved screen 19 through the discharge port 15, and the abrasive falls into the collection cover 17 through the gaps in the curved screen 19 and re-enters the barrel 8 through the return port 16; Since the lowest point of the curved screen 19 is located above the collecting cover 17 and the stopping wheel 24 is provided, the workpiece will not slide directly off the curved screen 19, but will stay on the curved screen 19 for a period of time. At this time, due to the rotation of the stopping wheel 24, the workpiece will also rotate, thereby discharging most of the abrasive remaining inside the workpiece, and will be ejected only when the next workpiece slides off.

[0061] As long as the workpieces can stay on the curved screen 19 for a period of time, most of the abrasive inside can be discharged, whether by rotation or vibration, so the number of workpieces on the curved screen 19 is not important.

[0062] As another new embodiment of the present invention, the blades of the outer ring auger 7 are provided with a hollow portion that is larger than the diameter of the abrasive. At this time, the pushing effect of the outer ring auger 7 on the abrasive will be weakened, but the pushing effect on the workpiece remains unchanged. This design can further increase the relative movement between the workpiece and the abrasive, and further improve the grinding efficiency. When adopting this scheme, it is still necessary to pay attention to the pushing speeds of the inner ring auger 6 and the outer ring auger 7 to match each other to avoid the accumulation of abrasive at one end.

[0063] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0064] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A low-density hard rubber part edge grinding device, characterized by: The invention comprises a bidirectional mixing and grinding assembly (1) and a base (4), wherein the bidirectional mixing and grinding assembly (1) comprises a central spindle (5), an inner ring auger (6) and an outer ring auger (7), wherein the inner ring auger (6) is provided with a central sleeve (10), and the inner ring auger (6) is fixedly connected to the central spindle (5) through the central sleeve (10), and one end of the outer ring auger (7) is provided with an end sealing plate (13), and the outer ring auger (7) is fixedly connected to the central spindle (5) through the end sealing plate (13). The central spindle (5) can rotate with the inner ring auger (6) and the outer ring auger (7) at the same time, and the spiral directions of the blades of the inner ring auger (6) and the outer ring auger (7) are opposite, and the spiral blades of the inner ring auger (6) and the outer ring auger (7) do not overlap in axial projection.

2. The low-density hard rubber part edge grinding device according to claim 1, characterized in that: The outer ring of the outer ring auger (7) is also provided with arc-shaped convex tubes (11) and connecting rods (12) evenly distributed in an annular manner, wherein the number of the connecting rods (12) is less than the number of the arc-shaped convex tubes (11), and the connecting rods (12) are connected to the end sealing plate (13).

3. The low-density hard rubber part edge grinding device according to claim 2, characterized in that: The bidirectional mixing and grinding assembly (1) further includes a barrel (8), which is arranged on a base (4), and the central spindle (5), the inner ring auger (6) and the outer ring auger (7) are all rotatably arranged in the barrel (8), the central spindle (5) extends from one end of the barrel (8), and a main gear (9) is provided on the end of the central spindle (5) located outside the barrel (8), and the outer ring of the outer ring auger (7) is in contact with the inner wall of the barrel (8).

4. The low-density hard rubber part edge grinding device according to claim 3, characterized in that: A feed port (14) is provided at the top of one end of the barrel (8), and the length of the arc-shaped convex tube (11) does not reach the feed port (14), so that the parts in the feed port (14) can pass through the gap of the connecting rod (12) and fall into the barrel (8). A discharge port (15) is provided at the other end of the barrel (8), and a return port (16) is provided below the discharge port (15), so that the abrasive falling with the workpiece in the discharge port (15) can re-enter the barrel (8) through the return port (16).

5. The low-density hard rubber part edge grinding device according to claim 4, characterized in that: The invention also includes a screening reflux component (2), wherein the screening reflux component (2) includes a collecting cover (17), a side baffle (18) and an arc-shaped screen (19), wherein the collecting cover (17) is fixed to the outside of the reflux port (16), the side baffle (18) is fixed to the barrel (8), and the side baffle (18) is located on both sides of the discharge port (15), one end of the arc-shaped screen (19) is fixed to the barrel (8), and the other end of the arc-shaped screen (19) is fixed to the collecting cover (17).

6. The low-density hard rubber part edge grinding device according to claim 5, characterized in that: The lowest point of the arc-shaped screen (19) is located above the collecting hood (17).

7. The low-density hard rubber part edge grinding device according to claim 6, characterized in that: The invention also includes a rotation stop assembly (3), the rotation stop assembly (3) including a stop shaft (23) and a stop wheel (24), an external boss (20) is provided on the outside of the collection cover (17), a through hole (21) is provided on the external boss (20), the stop shaft (23) is rotatably arranged in the through hole (21), and the stop wheel (24) is fixed to the stop shaft (23).

8. The low-density hard rubber part edge grinding device according to claim 7, characterized in that: The stopping wheel (24) is composed of a plurality of independent wheels, and the arc-shaped screen (19) is provided with a straight screening groove in an array, and the stopping wheel (24) is located in the straight screening groove.

9. The low-density hard rubber part edge grinding device according to claim 8, characterized in that: The rotation stopping assembly (3) further comprises a stopping motor (22), wherein the stopping motor (22) is arranged on the external boss (20), and the output shaft of the stopping motor (22) is connected to the stopping long shaft (23).

10. The low-density hard rubber part edge grinding device according to claim 9, characterized in that: The blades of the outer ring auger (7) are provided with a hollow portion larger than the diameter of the abrasive.

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