Device for preventing over-grinding with controllable particle size

Abstract

The application discloses a particle size controllable anti-overgrinding device, which comprises a rack, a grinding bowl and a vibrating mechanism arranged on the rack, a blowing and lifting mechanism, a screen, a discharge slit arranged on the side wall of the grinding bowl and communicated with the grinding cavity, a discharge hopper arranged outside the grinding bowl and communicated with the discharge slit, and a negative pressure pipe and a gas conveying hose of the blowing and lifting mechanism.

Description

Technical Field

[0001] This invention mainly relates to the field of grinding equipment technology, specifically a particle size controllable anti-over-grinding device. Background Technology

[0002] A sample preparation pulverizer is a type of pulverizing and grinding equipment. It mainly includes a vibration mechanism and a grinding bowl. The impact ring and impact block in the grinding chamber move randomly under the action of the vibration mechanism. By using the collision between the impact ring and the impact block, the particulate sample in the impact ring is pulverized and ground into a powder sample.

[0003] During the crushing and grinding process, the particulate sample within the impact ring contains small particles, large particles, and powder. As crushing and grinding progresses, the proportion of small particles and powder increases, and large particles become embedded within the small particles and powder, similar to pebbles being buried in gravel, leading to a decrease in subsequent crushing and grinding efficiency. In other words, as grinding continues, not only can the powder sample meeting the preparation requirements not be discharged in time, resulting in over-grinding and powder particles smaller than the required particle size, but the accumulated powder and small particles within the grinding chamber also negatively impact grinding efficiency and effect. Often, after grinding, the powder sample still contains small particles, necessitating subsequent sieving and secondary grinding of the collected powder sample. Summary of the Invention

[0004] The present invention addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. It mainly provides a particle size controllable anti-over-grinding device to solve the technical problem mentioned in the background that the accumulation of powder samples and small particles in the grinding chamber will negatively affect the grinding effect and grinding efficiency.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A particle size controllable anti-over-grinding device includes a frame, a grinding bowl and a vibration mechanism mounted on the frame. The grinding bowl includes a bowl body and an impact ring and an impact block movably disposed within the grinding chamber of the bowl body. The impact block is located within the impact ring. The top of the bowl body has a feed inlet communicating with its grinding chamber. The device also includes:

[0007] A blowing mechanism that uses airflow to lift the powder sample in the grinding bowl;

[0008] The sieve has a wide upper end that connects to the top of the bowl and a narrow lower end that connects to the top of the impact ring.

[0009] The grinding bowl has a discharge slit on its side wall that connects to the grinding chamber, and a discharge hopper that connects to the discharge slit is provided on the outside of the grinding bowl.

[0010] The blowing mechanism includes an air supply hose and a negative pressure pipe. One end of the negative pressure pipe is connected to and communicates with the discharge hopper, and one end of the air supply hose is connected to the impact block. The impact block has multiple blowing holes that penetrate the top and sides along the circumferential direction. The air supply hose communicates with the multiple blowing holes through a diversion component set on the top of the impact block.

[0011] Furthermore, multiple annular ribs are provided at axial intervals on the screen.

[0012] Furthermore, the side wall of the impact block is provided with a plurality of spray angle adjustment plates along the circumferential direction. The upper end of the spray angle adjustment plate is rotatably connected to the impact block or connected through an elastic structure. The side of the impact block is provided with a plurality of embedding grooves along the circumferential direction that can accommodate the spray angle adjustment plates. The upper end of the spray angle adjustment plate and the outlet end of the spray hole are both located in the embedding grooves.

[0013] Furthermore: the blowing angle adjustment plate is arc-shaped in the circumferential direction of the impact block, the upper end of the blowing angle adjustment plate is rotatably set on the groove wall of the embedded groove, and the outer side of the lower end of the blowing angle adjustment plate is arc-shaped to adapt to the shape of the inner wall of the impact ring.

[0014] Furthermore, the sidewall of the impact block is provided with multiple inclined guide grooves at circumferential intervals, the guide grooves penetrate the top of the impact block, and the depth of the guide grooves gradually decreases from top to bottom.

[0015] Furthermore: the diversion assembly includes a conical shell, an annular tube seat, and an air inlet pipe. The conical shell is disposed on the top of the impact block. The interior of the conical shell is provided with multiple air distribution channels along the circumference. The air distribution channels penetrate the bottom of the conical shell and communicate with the blow holes. The air inlet pipe is disposed on the top of the conical shell and communicates with the multiple air distribution channels. The air delivery hose is connected to the air inlet pipe.

[0016] Furthermore: the feed inlet at the top of the grinding bowl is connected to a feed hose, and the lower end of the feed hose is connected to the top of the conical shell. The top of the conical shell is provided with multiple feeding grooves along the circumference. The feeding grooves are inclined relative to the horizontal plane, and the lower end of the feeding grooves penetrates the outer side of the conical shell. The depth of the feeding grooves is not less than the particle size of the particle sample input into the grinding chamber. The top of the guide groove is located between adjacent feeding grooves, and the vertical line of the guide groove is located between adjacent spray angle adjustment plates.

[0017] Furthermore: the inner wall of the discharge hopper is provided with a spiral air guide groove, and the negative pressure pipe is connected to the spiral air guide groove and is arranged along the tangential direction of the spiral air guide groove;

[0018] Multiple baffles are arranged circumferentially on the inner wall of the lower end of the discharge hopper, and the baffles are arranged axially along the discharge hopper.

[0019] Furthermore: the bowl body includes a bowl bottom, a bowl lid, a fixed ring wall, a movable ring wall, and bolts. The wide end of the screen is connected to the bowl lid. Both the fixed ring wall and the movable ring wall are annular and are located between the bowl bottom and the bowl lid. There are multiple fixed ring walls and multiple movable ring walls, and the multiple fixed ring walls and multiple movable ring walls are stacked alternately.

[0020] The bottom of the bowl, the lid of the bowl, and the outer side of the fixed ring wall are all connected with at least three fixed ears. Between two layers of fixed ears, there is a movable ear for limiting the movable ring wall. The multiple layers of fixed ears and movable ears are connected by bolts.

[0021] The thickness of the movable ring wall is less than the thickness of the movable ear, so that a discharge slit is formed above and / or below the movable ear.

[0022] Furthermore: the frame is provided with multiple support springs, and multiple grinding bowls are supported on the multiple support springs by a vibration panel, and the multiple grinding bowls are arranged at equal intervals around the vibration mechanism.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. The present invention uses a flow-dividing component on the impact block to disperse the airflow input from the air supply hose to the spray holes around the impact block, so that the position of the spray holes can be adjusted with the moving impact block, thereby improving the efficiency of crushing and grinding and cleaning the grinding bowl by spraying while ensuring the effect.

[0025] 2. The negative pressure pipe and screen of this invention can screen the powder sample raised by the sprayed airflow and quickly discharge it to the discharge hopper, ensuring the quality and efficiency of sample preparation.

[0026] 3. By connecting the lower end of the feed hose to the conical shell with a feeding groove on the top of the impact block, the present invention enables the particle sample to be accurately fed between the impact ring and the impact block even during the grinding process and without stopping the vibration mechanism.

[0027] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the grinding chamber structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the bowl body of the present invention;

[0031] Figure 4 This is a schematic diagram of the conical shell structure of the present invention;

[0032] Figure 5 for Figure 4 A sectional view;

[0033] Figure 6 This is a schematic diagram of the impact block of the present invention;

[0034] Figure 7 This is a schematic diagram of the feed hose of the present invention;

[0035] Figure 8 This is a schematic diagram of the structure of the screen of the present invention;

[0036] Figure 9 This is a schematic diagram of the hopper structure of the present invention;

[0037] Figure 10 This is a schematic diagram of the spoiler structure of the present invention;

[0038] Figure 11 This is an exploded view of the grinding bowl, conical shell, and feed hose of the present invention.

[0039] Numbering on the map:

[0040] 1. Frame; 2. Grinding bowl; 3. Vibration mechanism; 4. Screen; 5. Grinding chamber; 6. Discharge slit; 7. Air supply hose; 8. Negative pressure pipe; 9. Discharge hopper; 10. Spray nozzle; 11. Annular rib; 12. Spray angle adjustment plate; 13. Embedded groove; 14. Guide groove; 15. Conical shell; 16. Annular tube seat; 17. Air inlet pipe; 18. Air distribution channel; 19. Feed hose; 20. Discharge chute; 21. Spiral air guide groove; 22. Baffle plate; 23. Support spring; 24. Vibration panel;

[0041] 201. Bowl body; 202. Impact ring; 203. Impact block; 204. Feed inlet;

[0042] 2011, Bowl bottom; 2012, Bowl lid; 2013, Fixed ring wall; 2014, Movable ring wall; 2015, Fixed ear; 2016, Movable ear. Detailed Implementation

[0043] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0044] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0045] Please refer to the appendix carefully. Figure 1-11 A particle size controllable anti-over-grinding device includes a frame 1, a grinding bowl 2 and a vibration mechanism 3 mounted on the frame 1. The grinding bowl 2 includes a bowl body 201, an impact ring 202 and an impact block 203 movably disposed within a grinding chamber 5 of the bowl body 201, with the impact block 203 located within the impact ring 202. The top of the bowl body 201 is provided with a feed inlet 204 communicating with its grinding chamber 5. The device also includes:

[0046] The blowing mechanism uses airflow to blow up the powder sample in the grinding bowl 2.

[0047] The sieve 4 has a wide upper end that is connected to the top of the bowl 201 and a narrow lower end that is connected to the top of the impact ring 202.

[0048] The grinding bowl 2 has a discharge slit 6 on its side wall that connects to the grinding chamber 5, and a discharge hopper 9 that connects to the discharge slit 6 is provided on the outside of the grinding bowl 2.

[0049] The blowing mechanism includes an air supply hose 7 and a negative pressure pipe 8. One end of the negative pressure pipe 8 is connected to and communicates with the discharge hopper 9. One end of the air supply hose 7 is connected to the impact block 203. The impact block 203 has multiple blowing holes 10 that penetrate the top and sides along the circumferential direction. The air supply hose 7 communicates with the multiple blowing holes 10 through a diversion component set on the top of the impact block 203.

[0050] Specifically, when the vibration mechanism 3 is activated, the grinding bowl 2 vibrates. The impact block 203 and impact ring 202 within the grinding chamber 5 slide irregularly due to this vibration, causing collisions between the impact block 203 and impact ring 202, and between the impact ring 202 and the inner wall of the grinding chamber 5. The particle sample fed into the grinding chamber 5 through the feed inlet 204 is compressed and broken during the collisions. Simultaneously, the airflow fed into the grinding chamber 5 through the air delivery hose 7 is divided into multiple streams by the flow divider and then directed to multiple spray holes 10 distributed around the impact block 203. The airflow is blown through the spray holes 10 towards the space between the impact block 203 and impact ring 202, promoting the lifting of highly pulverized powder samples. Simultaneously, the negative pressure pipe 8 creates negative pressure inside the discharge hopper 9 by expending air from the discharge hopper 9 or by guiding the airflow to rotate and flow within the discharge hopper 9. Because the inside of the discharge hopper 9 is a negative pressure environment, the air in the grinding chamber 5 is drawn into the discharge hopper 9 through the discharge slit 6, so that the powder sample that is raised passes through the discharge slit 6 and enters the discharge hopper 9.

[0051] The function of the sieve 4 is to screen the powder sample to prevent powder samples that do not meet the particle size requirements from being blown up by excessive airflow, impact ring 202 and impact block 203, resulting in substandard powder samples and blockage of the discharge slit 6.

[0052] Vibration mechanism 3 typically includes a motor and an eccentric hammer, with the motor driving the eccentric hammer to rotate and generate vibration.

[0053] In addition, the negative pressure inside the discharge hopper 9 should be appropriate to prevent small-sized samples that do not meet the sample preparation requirements from being lifted up and adhering to the screen 4, which would prevent the screen 4 from being clogging. Connecting the lower end of the screen 4 to the impact ring 202 allows the screen 4 to move continuously with the movement of the impact ring 202, facilitating the removal of adhering materials and preventing clogging. The conical shape of the screen 4 allows the powder cake adhering to the inner side of the screen 4 to be shaken off and dispersed, and then sieved again by the screen 4.

[0054] In particular, the spray nozzle 10 of this invention is located on the impact block 203. During the process of the impact block 203 approaching and colliding with the impact ring 202, the position of the spray nozzle 10 can be continuously adjusted following the impact block 203. Even with a small spray airflow, the continuous movement of the impact block 203 relative to the impact ring 202 can effectively lift the powder sample between the impact ring 202 and the impact block 203. This solves the problems caused by a fixed spray position, where it is difficult to fully lift the powder sample when the spray airflow is small, and where small particles that do not meet the sample preparation requirements are lifted when the spray airflow is large. Furthermore, small particles encasing large particles can also be dispersed under the action of the spray airflow, exposing the large particles and improving the consistency of the crushing and grinding process, thereby improving the grinding effect and efficiency.

[0055] In addition, after grinding is completed, by increasing the jet airflow and starting the vibration mechanism 3, combined with the movement of the impact block 203, it is beneficial to improve the jet cleaning effect inside the grinding chamber 5.

[0056] It should be noted that the function of the airflow in this invention is not only to promote the lifting of powder particles, but also to disperse the small particles encasing large particles in the collision area between the impact block 203 and the impact ring 202. Therefore, the airflow magnitude is not always the same, nor is it always necessary to spray; it can be rationally selected according to the actual situation. For example, in the later stage of grinding, after there are no large particles in the impact ring 202, the airflow can be reduced or stopped to prevent small particles from escaping from the collision area between the impact block 203 and the impact ring 202. Even if spraying is stopped, the continuous collision and compression between the impact block 203 and the impact ring 202, as well as the airflow generated by their continuous movement, can still lift the powder sample between the impact block 203 and the impact ring 202. Furthermore, the continuous flow of air from the grinding chamber 5 into the discharge hopper 9 through the discharge slit 6 also promotes the lifting of the powder sample.

[0057] In summary, this invention uses a flow-diverting component on the impact block 203 to distribute the airflow input from the air delivery hose 7 to the spray holes 10 around the impact block 203. This allows the position of the spray holes 10 to be adjusted according to the moving impact block 203, thereby improving the efficiency of crushing, grinding, and cleaning the grinding bowl 2 while ensuring effectiveness. Furthermore, combined with the negative pressure pipe 8 and the screen 4, it can sieve the powder sample lifted by the sprayed airflow and quickly discharge it to the discharge hopper 9, ensuring the quality and efficiency of sample preparation.

[0058] Because the screen 4 remains relaxed during the movement of the impact ring 202 within the grinding chamber 5, multiple annular ribs 11 are axially arranged on the screen 4 to prevent it from twisting and knotting. The diameter of each annular rib 11 is adapted to the diameter of the screen 4 at its location. The anti-twist principle of the annular ribs 11 is that, with the distance between the two ends of the screen 4 remaining constant, the vertical component of the force generated by the twisting of the screen 4 is insufficient to lift the impact ring 202. The length of the screen 4 between two adjacent annular ribs 11 cannot meet the requirements for twisting and knotting, or in other words, the length of the screen 4 between two adjacent annular ribs 11 cannot satisfy the condition for the two annular ribs 11 to rotate 360° relative to each other. This prevents the screen 4 from twisting and knotting, which would block the internal channels of the screen 4, causing the screen 4 to malfunction and affecting the crushing and grinding effect of the impact ring 202.

[0059] Multiple spray angle adjustment plates 12 are provided on the side wall of the impact block 203 along the circumferential direction. The upper end of the spray angle adjustment plate 12 is rotatably connected to the impact block 203 or connected through an elastic structure. The side of the impact block 203 is provided with multiple embedding grooves 13 that can accommodate the spray angle adjustment plates 12 along the circumferential direction. The upper end of the spray angle adjustment plate 12 and the outlet end of the spray hole 10 are both located in the embedding grooves 13.

[0060] Specifically, the spray angle adjusting plate 12 is tilted outwards at its lower end under the action of the airflow from the spray hole 10 or the action of the elastic structure. At this time, the spray airflow is guided by the spray angle adjusting plate 12 and blows towards the bottom of the grinding chamber 5 between the impact ring 202 and the impact block 203. As the impact block 203 approaches the inner wall of the impact ring 202 until it collides, the spray angle adjusting plate 12 tilts further downwards under the reaction force after contacting the inner wall of the impact ring 202. On the one hand, this realizes the change of the spray angle, so that the spray angle can be adjusted after the spray angle adjusting plate 12 contacts the inner wall of the impact ring 202, as the impact block 203 further approaches the impact ring 202, so that the spray airflow can always blow towards the bottom of the grinding chamber 5, and not towards the inner wall of the impact ring 202. On the other hand, when the impact block 203 is about to collide with the impact ring 202, the particle sample between the two accumulates. At this time, due to the narrowing of the airflow channel between the spray angle adjustment plate 12 and the inner wall of the embedded groove 13, the spray airflow is concentrated and blown between the impact block 203 and the impact ring 202, which is beneficial to use a smaller spray airflow to disperse the small particle sample that encapsulates the large particle sample.

[0061] Preferably, the blowing angle adjusting plate 12 is arc-shaped in the circumferential direction of the impact block 203, the upper end of the blowing angle adjusting plate 12 is rotatably set on the groove wall of the embedded groove 13, and the outer side of the lower end of the blowing angle adjusting plate 12 is arc-shaped to adapt to the shape of the inner wall of the impact ring 202.

[0062] The arc-shaped or arched structure of the spray angle adjustment plate 12 can disperse the impact force of the particle sample falling onto the spray angle adjustment plate 12. The arc-shaped structure at the lower end of the spray angle adjustment plate 12 facilitates full contact between the lower end of the spray angle adjustment plate 12 and the inner wall of the impact ring 202 when the lower end of the spray angle adjustment plate 12 contacts the inner wall of the impact ring 202, preventing damage to the spray angle adjustment plate 12 due to uneven force. Furthermore, the bottom wall of the embedding groove 13 is preferably inclined downwards to facilitate the discharge of the particle sample entering the embedding groove 13.

[0063] In addition, the spacing between adjacent spray angle adjustment plates 12 is not less than the particle size of the particle sample input into the grinding bowl 2, so as to facilitate the spray angle adjustment plates 12 to avoid the particle sample and to prevent the particle sample from getting stuck between two adjacent spray angle adjustment plates 12.

[0064] A further optimization of the above embodiment is that multiple inclined guide grooves 14 are provided circumferentially on the side wall of the impact block 203, the guide grooves 14 penetrate the top of the impact block 203, and the depth of the guide grooves 14 gradually decreases from top to bottom.

[0065] The flow guide trough 14 is preferably located at the upper end of the impact block 203 to prevent large particles from entering the flow guide trough 14. Since the flow guide trough 14 has a spiral upward structure and its depth gradually decreases from top to bottom, as the impact block 203 approaches the inner wall of the impact ring 202, the air between them is compressed. Part of the compressed air spirals upward along the flow guide trough 14 under pressure, promoting the rotation and upward flow of air between the impact ring 202 and the impact block 203. In other words, the flow guide trough 14 has a guiding function, which helps prevent the formation of vortices in the airflow between the impact rings 202 and 203, thus avoiding a negative impact on the powder sample's lifting effect.

[0066] The diversion assembly includes a conical shell 15, an annular tube seat 16, and an air inlet pipe 17. The conical shell 15 is located on top of the impact block 203. Multiple air distribution channels 18 are provided circumferentially inside the conical shell 15. The air distribution channels 18 penetrate the bottom of the conical shell 15 and are connected to the blow hole 10. The air inlet pipe 17 is located on top of the conical shell 15 and is connected to the multiple air distribution channels 18. The air delivery hose 7 is connected to the air inlet pipe 17.

[0067] Furthermore, the feed inlet 204 at the top of the grinding bowl 2 is connected to a feed hose 19, and the lower end of the feed hose 19 is connected to the top of the conical shell 15 through an annular tube seat 16. The top of the conical shell 15 is provided with multiple feed troughs 20 along the circumference. The feed troughs 20 are inclined relative to the horizontal plane, and the lower end of the feed troughs 20 penetrates the outer side of the conical shell 15. The depth of the feed troughs 20 is not less than the particle size of the particle sample input into the grinding chamber 5. The top of the guide channel 14 is located between adjacent feed troughs 20, and the vertical line of the guide channel 14 is located between adjacent spray angle adjustment plates 12.

[0068] On the one hand, the multiple feeding slots 20 at the top of the conical shell 15 guide the particle sample into the grinding chamber 5, thereby greatly reducing the probability of the particle sample hitting the spray angle adjustment plate 12 during its fall. On the other hand, the lower end of the feed hose 19 used to feed the particle sample into the grinding chamber 5 always moves with the impact block 203, ensuring that the particle sample can accurately fall between the impact block 203 and the impact ring 202, and will not fall onto the screen 4. This not only extends the service life of the screen 4, but also enables the particle sample to be accurately fed between the impact block 203 and the impact ring 202 during the grinding process or without stopping the machine, which is convenient for operation. In addition, the conical shell 15 also facilitates the rapid fall of the particle sample at the top of the impact block 203 into the space between the impact block 203 and the impact ring 202.

[0069] The inner wall of the discharge hopper 9 is provided with a spiral air guide groove 21. A negative pressure pipe 8 is connected to the spiral air guide groove 21 and is arranged tangentially to it. Air is blown into the spiral air guide groove 21 through the negative pressure pipe 8, creating a downward spiral airflow within the discharge hopper 9. This reduces the air pressure inside the discharge hopper 9, creating a negative pressure environment relative to the grinding chamber 5. The spiral air guide groove 21 guides the airflow, facilitating its stability within the discharge hopper 9. Furthermore, the downward spiral airflow facilitates the discharge of the powder sample.

[0070] To prevent the spiral airflow from forming an upward airflow at the axis of the spiral airflow (refer to the principle of cyclone dust collector) after entering the conical lower end of the discharge hopper 9, thus affecting the discharge of the powder sample, multiple baffles 22 are arranged circumferentially on the inner wall of the lower end of the discharge hopper 9. The baffles 22 are arranged axially along the discharge hopper 9, that is, multiple baffles 22 contact the rotation of the airflow to prevent the formation of an upward airflow at the axis of the spiral airflow, so that the powder sample can be smoothly discharged from the outlet at the bottom of the discharge hopper 9.

[0071] The bowl body 201 includes a bowl bottom 2011, a bowl cover 2012, a fixed ring wall 2013, a movable ring wall 2014, and bolts. The wide end of the screen 4 is connected to the bowl cover 2012. The fixed ring wall 2013 and the movable ring wall 2014 are both annular and are located between the bowl bottom 2011 and the bowl cover 2012. There are multiple fixed ring walls 2013 and multiple movable ring walls 2014, and multiple fixed ring walls 2013 and multiple movable ring walls 2014 are stacked alternately.

[0072] At least three fixing ears 2015 are connected to the outer sides of the bowl bottom 2011, bowl lid 2012 and fixing ring wall 2013. Between two layers of fixing ears 2015, there is a movable ear 2016 for limiting the movable ring wall 2014. The multiple layers of fixing ears 2015 and movable ears 2016 are connected by bolts.

[0073] The thickness of the movable ring wall 2014 is less than the thickness of the movable ear 2016, so that a discharge slit 6 is formed above and / or below the movable ear 2016.

[0074] By setting up a multi-layered movable ring wall 2014, the grinding bowl 2 can have multiple layers of discharge slits 6, which facilitates the entry of powder samples into the discharge hopper 9.

[0075] The frame 1 is equipped with multiple support springs 23, and multiple grinding bowls 2 are supported on the support springs 23 by a vibration panel 24. The grinding bowls 2 are arranged at equal intervals around the vibration mechanism 3. The multiple grinding bowls 2 are arranged by the vibration panel 24, and the multiple discharge hoppers 9 connected to the grinding bowls 2 are eccentrically set relative to the vibration mechanism 3 to facilitate the discharge of the grinding bowls 2.

[0076] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A particle size controllable anti-over-grinding device, comprising a frame (1) and a grinding bowl (2) and a vibration mechanism (3) disposed on the frame (1), wherein the grinding bowl (2) comprises a bowl body (201) and an impact ring (202) and an impact block (203) movably disposed within a grinding chamber (5) of the bowl body (201), the impact block (203) being located within the impact ring (202), and the top of the bowl body (201) being provided with a feed inlet (204) communicating with its grinding chamber (5), characterized in that, Also includes: The blowing mechanism uses airflow to blow up the powder sample in the grinding bowl (2); The sieve (4) has a wide upper end connected to the top of the bowl (201) and a narrow lower end connected to the top of the impact ring (202). The grinding bowl (2) has a discharge slit (6) on its side wall that connects to the grinding chamber (5), and the grinding bowl (2) has a discharge hopper (9) that connects to the discharge slit (6) on its outside. The blowing mechanism includes an air supply hose (7) and a negative pressure pipe (8). One end of the negative pressure pipe (8) is connected to and communicates with the discharge hopper (9). One end of the air supply hose (7) is connected to the impact block (203). The impact block (203) has multiple spray holes (10) that penetrate the top and sides along the circumferential direction. The air supply hose (7) communicates with the multiple spray holes (10) through a diversion component set on the top of the impact block (203). The diversion assembly includes a conical shell (15), an annular tube seat (16), and an air inlet pipe (17). The conical shell (15) is located on top of the impact block (203). The interior of the conical shell (15) is provided with multiple air distribution channels (18) along the circumferential direction. The air distribution channels (18) penetrate the bottom of the conical shell (15) and communicate with the blow hole (10). The air inlet pipe (17) is located on top of the conical shell (15) and communicates with the multiple air distribution channels (18). The air delivery hose (7) is connected to the air inlet pipe (17). The feed inlet (204) at the top of the grinding bowl (2) is connected to a feed hose (19), and the lower end of the feed hose (19) is connected to the top of the conical shell (15) through an annular tube seat (16). The top of the conical shell (15) is provided with multiple feed grooves (20) along the circumferential direction.

2. The particle size controllable anti-over-grinding device according to claim 1, characterized in that: Multiple annular ribs (11) are provided at intervals along the axial direction on the screen (4).

3. The particle size controllable anti-over-grinding device according to claim 1, characterized in that: The side wall of the impact block (203) is provided with a plurality of spray angle adjustment plates (12) along the circumferential direction. The upper end of the spray angle adjustment plate (12) is rotatably connected to the impact block (203) or connected through an elastic structure. The side of the impact block (203) is provided with a plurality of embedding grooves (13) that can accommodate the spray angle adjustment plates (12) along the circumferential direction. The upper end of the spray angle adjustment plate (12) and the outlet end of the spray hole (10) are both located in the embedding grooves (13).

4. The particle size controllable anti-over-grinding device according to claim 3, characterized in that: The spray angle adjustment plate (12) is arc-shaped in the circumferential direction of the impact block (203). The upper end of the spray angle adjustment plate (12) is rotatably set on the groove wall of the embedded groove (13). The outer side of the lower end of the spray angle adjustment plate (12) is arc-shaped to match the shape of the inner wall of the impact ring (202).

5. The particle size controllable anti-over-grinding device according to claim 3, characterized in that: The sidewall of the impact block (203) is provided with a plurality of inclined guide grooves (14) spaced circumferentially. The guide grooves (14) penetrate the top of the impact block (203), and the depth of the guide grooves (14) gradually decreases from top to bottom.

6. The particle size controllable anti-over-grinding device according to claim 5, characterized in that: The feeding trough (20) is inclined relative to the horizontal plane, and the lower end of the feeding trough (20) penetrates the outer side of the conical shell (15). The depth of the feeding trough (20) is not less than the particle size of the particle sample in the grinding chamber (5). The top of the guide trough (14) is located between adjacent feeding troughs (20), and the vertical line of the guide trough (14) is located between adjacent spray angle adjustment plates (12).

7. The particle size controllable anti-over-grinding device according to claim 1, characterized in that: The inner wall of the discharge hopper (9) is provided with a spiral air guide groove (21), and the negative pressure pipe (8) is connected to the spiral air guide groove (21) and is arranged along the tangential direction of the spiral air guide groove (21); Multiple baffles (22) are arranged circumferentially on the inner wall of the lower end of the discharge hopper (9), and the baffles (22) are arranged axially along the discharge hopper (9).

8. The particle size controllable anti-over-grinding device according to claim 1, characterized in that: The bowl body (201) includes a bowl bottom (2011), a bowl lid (2012), a fixed ring wall (2013), a movable ring wall (2014), and bolts. The wide end of the screen (4) is connected to the bowl lid (2012). The fixed ring wall (2013) and the movable ring wall (2014) are both annular and are located between the bowl bottom (2011) and the bowl lid (2012). There are multiple fixed ring walls (2013) and multiple movable ring walls (2014). Multiple fixed ring walls (2013) and multiple movable ring walls (2014) are stacked alternately. At least three fixing ears (2015) are connected to the outer sides of the bowl bottom (2011), bowl lid (2012) and fixed ring wall (2013). A movable ear (2016) for limiting the movable ring wall (2014) is provided between two layers of fixing ears (2015). The multiple layers of fixing ears (2015) and movable ears (2016) are connected by bolts. The thickness of the movable ring wall (2014) is less than the thickness of the movable ear (2016) so that a discharge slit (6) is formed above and / or below the movable ear (2016).

9. The particle size controllable anti-over-grinding device according to claim 1, characterized in that: The frame (1) is provided with multiple support springs (23), and multiple grinding bowls (2) are supported on multiple support springs (23) by a vibration panel (24), and multiple grinding bowls (2) are arranged at equal intervals around the vibration mechanism (3).

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