Suction mechanism and use in magnetic powder collection

Abstract

The application provides a suction mechanism and application in magnetic powder collection, relates to the technical field of negative pressure suction, and comprises a cannula, a plurality of second grooves which are arranged around the axis of the cannula and in the side wall array of the cannula, and a tip which is located in the cannula; the tip is externally connected with a pipeline for connecting a pump group, and the tip is further provided with a tip extension block which extends into the second grooves and guides the tip to slide along the direction of the second grooves; the second grooves are provided with elastic members, and the second grooves are further provided with supporting rods which are unfolded outward from the second grooves or turned into the second grooves, the supporting rods are matched with a second hose, and the second hose penetrates through the tip extension block and extends to the elastic members; in the application, when the supporting rods are turned into the second grooves, the spring accumulates kinetic energy for unfolding the supporting rods outward, on the contrary, when the spring releases the accumulated kinetic energy, all the supporting rods are unfolded outward and cut into the powder pile, and then the supporting rods are effective supporting parts, so that the cannula is not affected by the volume change of the powder pile and is long-acting and stable in the pile.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of negative pressure suction, in particular to a suction mechanism and application thereof in magnetic powder collection. BACKGROUND

[0002] When fine and dense powder such as magnetic powder is sucked in a container, a pump pipe is usually preset at the bottom of the container. Alternatively, a pipe is inserted into the powder stack after the powder is stacked, to replace the foregoing mode of sucking the powder. However, the following problems are caused by the foregoing method: the inserted pipe is difficult to be vertically arranged in the stack in a stable manner after the scale of the stack is reduced; the port of the inserted pipe for sucking is located deep in the stack, and the suction force of a small-power pump group is insufficient to provide long-acting suction force; in addition, the corners of the container are far away from the port of the inserted pipe, and the suction range does not involve the corners, so that the powder is not easily sucked completely. Therefore, it is necessary to propose a suction mechanism for the magnetic powder collection to solve the foregoing problems. SUMMARY

[0003] The purpose of the application is to provide a suction mechanism and application thereof in magnetic powder collection, to solve the foregoing technical problems.

[0004] To solve the foregoing technical problems, the application adopts the following technical scheme:

[0005] The suction mechanism comprises a pipe, a plurality of second grooves arranged around the axis of the pipe and on the side wall of the pipe, and a tip located in the pipe.

[0006] The tip is connected with a pipe for connecting a pump group, and the tip is further provided with a tip extension block which extends into the second groove and guides the tip to slide along the direction of the second groove.

[0007] The second groove is provided with an elastic member, and the second groove is further provided with a support rod which is unfolded outwardly from the second groove or is rotated into the second groove, the support rod is matched with a second hose, and the second hose extends through the tip extension block and extends to the elastic member.

[0008] Each tip extension block is provided with a signal rod, and each support rod is provided with a slot for guiding the signal rod to extend into the support rod.

[0009] When all the support rods are rotated into the corresponding second grooves and all the signal rods are inserted into the corresponding slots, the elastic member accumulates kinetic energy for unfolding the second groove outwardly, or when all the signal rods are pulled out of the corresponding slots, the elastic member releases the accumulated kinetic energy to guide all the support rods to unfold outwardly.

[0010] Preferably, before the pipe is inserted into the powder stack, all the support rods are rotated into the corresponding second grooves, and all the signal rods are inserted into the corresponding slots, so that the elastic member accumulates kinetic energy for unfolding the second groove outwardly.

[0011] Preferably, all the supporting rods of the insertion tube are cut into the powder pile after the insertion tube is inserted into the powder pile, so that the insertion tube is stably erected in the powder pile.

[0012] Preferably, the bottom opening of the insertion tube is filled with a blocking part, which prevents the powder from entering the insertion tube through the bottom opening when the insertion tube is inserted into the powder pile.

[0013] Preferably, a first slot corresponding to each second slot is arranged at the top opening of the insertion tube, and the first slot is used to fix the elastic member.

[0014] Preferably, the elastic member comprises a first block fixed in the first slot, a second block located in the second slot and in sliding cooperation with the second slot, and a spring connecting the first block and the second block, wherein the second block is the fixed part of the second hose.

[0015] Preferably, the height difference between the rotating joint of the supporting rod and the second slot and the bottom opening of the insertion tube enables the second hose connected with the supporting rod to be inclined in the insertion tube when all the supporting rods are unfolded outwardly, and the inclined second hose is pressed tightly in the sliding of the end head relative to the second slot, so as to guide the further unfolding of the supporting rod.

[0016] Preferably, the application further comprises a first hose in communication with one end of the second hose, and the first hose is provided with a first electromagnetic valve, and the other end of the second hose is provided with a second electromagnetic valve.

[0017] The signal rod is used to control the first electromagnetic valve and the second electromagnetic valve, wherein the first electromagnetic valve and the second electromagnetic valve are in a closed state when the signal rod is inserted into the slot and the end head is slid relative to the second slot, or the first electromagnetic valve and the second electromagnetic valve are in an open state when the end head falls to the final position and the signal rod contacts the second hose.

[0018] Preferably, the first electromagnetic valve and the second electromagnetic valve in the closed state extrude the second hose when the powder enters the insertion tube from the second slot, so as to expand the supporting rods unfolded outwardly.

[0019] The application of the suction mechanism in the collection of magnetic powder comprises that the powder pile is a magnetic powder pile, the insertion tube is inserted into the magnetic powder pile, and all the supporting rods are unfolded outwardly and cut into the magnetic powder pile, so that the insertion tube is erected in the magnetic powder pile.

[0020] The application has the following beneficial effects:

[0021] 1. In the application, when the supporting rods are rotated into the second slots, the spring accumulates the kinetic energy for unfolding the supporting rods outwardly, and conversely, when the spring releases the accumulated kinetic energy, all the supporting rods are unfolded outwardly and cut into the powder pile, and then the supporting rods are used as effective support parts, so that the insertion tube is long-acting and stable in the pile body regardless of the volume change of the powder pile.

[0022] 2. In this invention, there is a height difference between the adapter and the bottom of the insertion tube, that is, between the screw joint of the support rod and the second groove and the bottom of the insertion tube. When all the support rods are extended outward, the second flexible tube connected to the support rod is tilted inside the insertion tube. In this way, as the end slides down relative to the second groove, the end will press tightly against the tilted second flexible tube, guiding the support rod to extend further outward.

[0023] 3. The present invention is also equipped with solenoid valves, wherein the first solenoid valve and the second solenoid valve in the closed state will squeeze the second flexible tube when the powder enters the insertion tube from the second groove, so that the air in the second flexible tube enters the support rod and guides the support rod to expand, thereby increasing the contact area between the support rod and the powder pile, making the insertion tube more stable and upright in the pile body.

[0024] 4. This invention combines an external air pump connected to a first hose, allowing pressurized air to be sprayed through a second hose to the corners of the container, causing the powder located at the corners to move disorderly. Combined with the continuous pump suction at the end, the remaining powder is guided into the pump suction range of the end, further improving the pump suction capacity of the suction structure. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the suction mechanism;

[0026] Figure 2 for Figure 1 A side sectional view of the suction mechanism shown;

[0027] Figure 3 for Figure 2 A three-dimensional sectional view of the suction mechanism shown;

[0028] Figure 4 A schematic diagram of the combined structure of a single support section and a suction section;

[0029] Figure 5 This is a schematic diagram of the suction section.

[0030] Figure 6 This is a schematic diagram of the suction unit from a downward viewing angle.

[0031] Figure 7 This is an enlarged structural diagram of the support section and parts thereof;

[0032] Reference numerals: 1. Insertion tube; 2. Spring tube; 3. First block; 4. Second block; 5. End extension block; 6. Support rod; 7. First flexible tube; 8. First solenoid valve; 9. Second flexible tube; 10. End; 11. End extension tube; 12. Receiving tube; 13. Spring; 14. First groove; 15. Second groove; 16. Second flexible tube through hole; 17. Threaded connector; 18. Signal rod; 19. Slot; 20. Thin sheet; 21. Positioning rod; 22. Limiting rod; 23. Second solenoid valve; 24. Adapter. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the following further describes the present application in combination with specific embodiments and drawings. However, the following embodiments are only preferred embodiments of the present application, and are not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0034] The specific embodiments described below in combination with the drawings.

[0035] Embodiment 1

[0036] In this embodiment, a suction mechanism is proposed, please refer to Figures 1-7 , the suction mechanism includes a cannula 1 for inserting into a powder pile (the powder pile is located in a container), as Figure 1 shown, the cannula 1 has six equidistant second grooves 15 on the side wall, it is noted that the second grooves 15 have openings, and the openings coincide with the bottom opening of the cannula 1.

[0037] Please refer to Figure 2 , the cannula 1 is provided with a tip 10, the tip 10 has a groove, of course, the groove is for assembling a threaded joint 17 as Figure 3 and Figure 4 shown, it is further explained that the threaded joint 17 has a receiving pipe 12, and the spring pipe 2 connected with the receiving pipe 12 is connected with a pump set (the pump set is not marked in the drawings), thus, it can be determined that the function of the tip 10 in the cannula 1 is to pump the powder into the cannula 1.

[0038] In order to enable the tip 10 to stably pump the powder into the cannula 1, six tip extension blocks 5 are arranged on the outer periphery of the tip 10, it is further explained that the six tip extension blocks 5 extend into the corresponding second grooves 15, and guide the tip 10 to slide along the direction of the second grooves 15.

[0039] Please refer to Figure 1 , the first groove 14 is arranged opposite to the second groove 15 at the cannula 1, the first groove 14 has an opening, in addition, the first groove 14 can fix the elastic member, and the elastic member includes the first block 3 fixed in the first groove 14, the second block 4 located in the second groove 15 and slidingly matched with the second groove 15, and the spring 13 receiving the first block 3 and the second block 4.

[0040] Please refer to Figure 4 and Figure 3 for reference, the first block 3 is embedded with a positioning rod 21, the positioning rod 21 extends into the pipe wall of the cannula 1, so that the first block 3 is fixed in the first groove 14;

[0041] For the second block 4, firstly, it is suspended by the spring 13, and secondly, it is provided with a limiting rod 22, which, like the positioning rod 21, extends into the pipe wall of the insertion pipe 1, and which, unlike the positioning rod 21, is in sliding fit with the second block 4, so it can be determined that when the second block 4 slides downward relative to the second groove 15, the spring 13 is pulled, and the spring 13 will accumulate kinetic energy for the reverse sliding of the second block 4.

[0042] Please refer to Figure 1 , Figure 4 and Figure 7 , the second groove 15 not only has the end extension block 5, but also has the support rod 6 below the end extension block 5, further, the support rod 6 is provided with an adapter 24 as shown in Figure 7 , which extends into the groove wall of the second groove 15, so it can be determined that the support rod 6 rotates relative to the second groove 15 by means of the adapter 24, and during the rotation, the support rod 6 either expands outward relative to the main body of the insertion pipe 1 with the adapter 24 as the axis, or rotates into the second groove 15.

[0043] As mentioned above, the spring 13 can accumulate kinetic energy, so in order to make the insertion pipe 1 stably located in the pile body in an upright posture, a second hose 9 as shown in Figure 3 is arranged between the second block 4 and the support rod 6, further, one end of the second hose 9 is fixed at the second block 4, and the other end of the second hose 9 penetrates the end extension block 5 and winds to the support rod 6 (the end extension block 5 is provided with a second hose penetration hole 16 as shown in Figure 3 , thereby facilitating the penetration of the second hose 9 through the end extension block 5).

[0044] According to the foregoing introduction, when the support rod 6 rotates into the second groove 15, the spring 13 will accumulate kinetic energy for the outward expansion of the support rod 6, it needs to be explained that before the outward expansion of the support rod 6, the insertion pipe 1 needs to be inserted into the pile body in an upright manner, and then the accumulated kinetic energy of the spring 13 is released, so that all the outwardly expanded support rods 6 cut into the powder pile, thereby taking the support rod 6 as an effective support part, so that the insertion pipe 1 is not affected by the volume change of the powder pile and is stably and long-acting in the pile body.

[0045] Further, the spring 13 can accumulate kinetic energy, but how to maintain the accumulated kinetic energy, or how to maintain the accumulated kinetic energy of the spring 13 before the insertion pipe 1 is inserted into the powder pile, specifically, as shown in Figure 6 and Figure 7 , the bottom of each end extension block 5 is provided with a signal rod 18, and the end of each support rod 6 close to the signal rod 18 is provided with a slot for guiding the signal rod 18 to extend into the support rod 6, so that after all the support rods 6 rotate into the second groove 15, in combination with the signal rod 18 arranged at the end extension block 5 inserted into the slot, the support rod 6 is limited to rotate reversely (outwardly expand).

[0046] Of course, as to how to release the rotation restriction of the signal rod 18 to the support rod 6, the end head 10 can be slightly lifted, and the signal rod 18 located at the end head extension block 5 is pulled out of the notch, thereby releasing the rotation restriction of the signal rod 18 to the support rod 6.

[0047] In this embodiment, further contents to be described include that the bottom of the end head 10 is provided with an end head extension pipe 11, as shown in Figure 6 The end head extension pipe 11 has a plurality of slots 19, so that, in combination with the end head extension pipe 11 as the extension part of the end head 10, the end head 10 is further assisted to suck the powder located at the bottom of the container when all the support rods 6 are spread out and touch the bottom of the container.

[0048] This embodiment also has an excellent design point, as shown in Figure 7 The height difference between the bottom opening of the adapter 24 to the insertion pipe 1, that is, the rotating joint of the support rod 6 and the second slot 15 to the bottom opening of the insertion pipe 1, so it can be clearly that the height difference makes the second hose 9 connected with the support rod 6 inclined in the insertion pipe 1 when all the support rods 6 are spread out, and the second hose 9 inclined in the insertion pipe 1 will press the inclined second hose 9 when the end head 10 slides down relative to the second slot 15, guiding the support rod 6 to further spread out.

[0049] Further description, the end head 10 has a sliding fit with the second slot 15, so that when all the support rods 6 are spread out, on the one hand, the second slot 15 located in the powder pile will be completely exposed, and on the other hand, the end head 10 will lose support, then it can be predicted that the powder enters the insertion pipe 1 from the second slot 15, and the end head 10 will also slowly move down, during which the end head 10 will fall on the powder entering the insertion pipe 1 (the height of the powder in the insertion pipe 1 tends to be consistent with the height of the powder outside the insertion pipe 1), so in combination with the weight of the end head 10 and the corresponding accessories, and the suction force of the end head 10 when sucking the powder, the end head 10 presses the inclined second hose 9, guiding the support rod 6 to further spread out, so that after the powder in the container is almost completely sucked, all the support rods 6 can strongly touch the bottom of the container, ensuring that the insertion pipe 1 is always straight in the container.

[0050] Embodiment 2

[0051] This embodiment further improves the related functions of embodiment 1, specifically, the contact area of the support rod 6 and the powder pile is improved, and in addition, after the powder in the container is almost completely sucked, the powder at the corners of the bottom of the container is guided into the suction range of the insertion pipe 1.

[0052] In order to make the content more coherent and convenient for review, the content related to embodiment 1 is pasted into this embodiment.

[0053] In this embodiment, the suction mechanism is proposed, please refer toFigures 1-7 The suction mechanism comprises a pipe 1 for insertion into the powder pile (the powder pile is located in a container), as shown in Figure 1 The pipe 1 has six equidistant second grooves 15 in its side wall, and it is noted that the second grooves 15 have openings coinciding with the bottom opening of the pipe 1.

[0054] Please refer to Figure 2 The pipe 1 is equipped with a tip 10, and the tip 10 has a groove, of course, the groove is for assembling a threaded connector 17 as shown in Figure 3 and Figure 4 It is further explained that the threaded connector 17 has a receiving pipe 12, and the spring pipe 2 connected to the receiving pipe 12 is connected to a pump set (the pump set is not marked in the figure), so it can be determined that the function of the tip 10 in the pipe 1 is to pump the powder into the pipe 1.

[0055] In order to enable the tip 10 to stably pump the powder into the pipe 1, six tip extension blocks 5 are arranged on the outer periphery of the tip 10, and it is further explained that the six tip extension blocks 5 extend into the corresponding second grooves 15 to guide the tip 10 to slide along the direction of the second grooves 15.

[0056] Please refer to Figure 1 The first groove 14 is arranged opposite to the second groove 15 at the pipe 1, and the first groove 14 has an opening, in addition, the first groove 14 can fix the elastic member, and the elastic member includes the first block 3 fixed in the first groove 14, the second block 4 located in the second groove 15 and slidingly matched with the second groove 15, and the spring 13 receiving the first block 3 and the second block 4.

[0057] Please refer to Figure 4 and Figure 3 for reference, the first block 3 is embedded with a positioning rod 21, and the positioning rod 21 extends into the pipe wall of the pipe 1, so that the first block 3 can be fixed in the first groove 14;

[0058] As for the second block 4, first of all, it is suspended by the spring 13, and in addition, it is provided with a limiting rod 22, and the same as the positioning rod 21 is that the limiting rod 22 extends into the pipe wall of the pipe 1, and different from the positioning rod 21 is that the second block 4 is slidingly matched with the limiting rod 22, so it can be determined that when the second block 4 slides downward relative to the second groove 15, the spring 13 is pulled, and the spring 13 will accumulate the kinetic energy for the reverse sliding of the second block 4.

[0059] Please refer to Figure 1 , Figure 4 and Figure 7 The second groove 15 not only has the tip extension block 5, but also has a supporting rod 6 below the tip extension block 5, and it is further explained that the supporting rod 6 is equipped with a Figure 7The adapter 24 is shown extending into the wall of the second slot 15. It can be determined that the strut 6 is rotated relative to the second slot 15 by means of the adapter 24. During the rotation, the strut 6 either expands outward relative to the main body of the spout 1 with the adapter 24 as the axis or rotates into the second slot 15.

[0060] As explained above, the spring 13 can accumulate kinetic energy. In order to stabilize the spout 1 in an upright position in the pile, a signal rod 18 is arranged between the second block 4 and the strut 6 as shown in Figure 3 The second hose 9 is shown. It is further explained that one end of the second hose 9 is fixed at the second block 4 and the other end of the second hose 9 extends through the end extension block 5 and winds around the strut 6 (the end extension block 5 is provided with a second hose through hole 16 as shown in Figure 3 The second hose through hole 16 is shown. It is further explained that the second hose 9 extends through the end extension block 5 through the second hose through hole 16).

[0061] According to the above introduction, when the strut 6 rotates into the second slot 15, the spring 13 will accumulate kinetic energy to make the strut 6 expand outward. It is necessary to explain that before the strut 6 expands outward, the spout 1 needs to be inserted into the pile in an upright manner. Then, the accumulated kinetic energy of the spring 13 is released to make all the struts 6 cut into the powder pile to effectively support the spout 1, which is not affected by the volume change of the powder pile and is stably and long-acting in the pile.

[0062] It is further explained that the spring 13 can accumulate kinetic energy. However, how to maintain the accumulated kinetic energy or how to maintain the accumulated kinetic energy of the spring 13 before the spout 1 is inserted into the powder pile. Specifically, as shown in Figure 6 and Figure 7 The bottom of each end extension block 5 is provided with a signal rod 18. The end close to the signal rod 18 of each strut 6 is provided with a slot for guiding the signal rod 18 to extend into the strut 6. Thus, after all the struts 6 rotate into the second slot 15, the signal rod 18 arranged at the end extension block 5 is inserted into the slot to limit the reverse rotation (outward expansion) of the strut 6.

[0063] Of course, how to release the rotation restriction of the signal rod 18 on the strut 6 can slightly lift the end 10 to pull out the signal rod 18 from the slot at the end extension block 5, thereby releasing the rotation restriction of the signal rod 18 on the strut 6.

[0064] It is further necessary to explain that the bottom of the end 10 is provided with an end extension pipe 11 as shown in Figure 6 The end extension pipe 11 has a plurality of slots 19. Thus, in combination with the end extension pipe 11 as an extension of the end 10, it further assists the end 10 to further suck the powder at the bottom of the container when all the struts 6 expand and touch the bottom of the container.

[0065] Please refer toFigure 7 The adapter 24 is higher than the bottom of the insertion tube 1, that is, the joint between the support rod 6 and the second groove 15 is higher than the bottom of the insertion tube 1. Thus, it can be seen that the height difference causes the second hose 9 connected to the support rod 6 to tilt in the insertion tube 1 when all the support rods 6 are unfolded outwardly. The second hose 9 tilted in the insertion tube 1 will press the tilted second hose 9 when the end head 10 slides downward relative to the second groove 15, guiding the support rod 6 to unfold further outwardly.

[0066] Further, the end head 10 is in frictional sliding fit with the second groove 15. Thus, when all the support rods 6 are unfolded outwardly, on the one hand, the second groove 15 will be completely exposed in the powder pile, and on the other hand, the end head 10 will lose support. It can be predicted that the powder will enter the insertion tube 1 from the second groove 15, and the end head 10 will also slowly move downward. During this process, the end head 10 will fall on the powder entering the insertion tube 1. Thus, in combination with the weight of the end head 10 and the corresponding fittings and the suction force of the end head 10 when sucking the powder, the end head 10 will press the tilted second hose 9, guiding the support rod 6 to unfold further outwardly, so that after the powder in the container is almost completely sucked, all the support rods 6 can reach the bottom of the container, ensuring that the insertion tube 1 is always upright in the container.

[0067] Compared with the first embodiment, the present embodiment adds the following structure:

[0068] ① The first hose 7 in communication with one end of the second hose 9. For the first hose 7, it penetrates the first block 3 into the spring 13 and is in butt joint with the second hose 9. Further, the first hose 7 is provided with the first electromagnetic valve 8. The other end of the second hose 9, that is, the end shown in the enlarged view, is provided with the second electromagnetic valve 23. Figure 7

[0069] ② The signal rod 18 mentioned in the first embodiment has another function in the present embodiment, that is, for controlling the first electromagnetic valve 8 and the second electromagnetic valve 23. When the signal rod 18 is inserted into the slot and the end head 10 slides relative to the second groove 15, the first electromagnetic valve 8 and the second electromagnetic valve 23 are in a closed state. On the contrary, when the signal rod 18 falls to the final position of the end head 10 and the signal rod 18 contacts the second hose 9 (the signal rod 18 has an extension stroke, so when the end head 10 falls to the final position and the signal rod 18 contacts the second hose 9, the signal rod 18 extends relative to the extension block 5 of the end head 10. Thus, in combination with the extension, the first electromagnetic valve 8 and the second electromagnetic valve 23 are controlled. In addition, the signal rod 18 controls the first electromagnetic valve 8 and the second electromagnetic valve 23 based on a wireless signal.

[0070] ​In combination with ① and ②, the first electromagnetic valve 8 and the second electromagnetic valve 23 in the closed state, when the powder enters the insertion pipe 1 from the second groove 15, the second hose 9 is extruded, the air in the second hose 9 enters the supporting rod 6, and the supporting rod 6 is expanded, and further, the two opposite ends of the supporting rod 6 are provided with through grooves, and the through grooves are provided with the thin sheet 20 communicated with the second hose 9, so that the second hose 9 in the supporting rod 6 is expanded, the thin sheet 20 is guided to extend outward, the contact area of the supporting rod 6 with the powder pile is increased, and the insertion pipe 1 is more stably erected in the pile.

[0071] The first electromagnetic valve 8 and the second electromagnetic valve 23 in the open state prove that the powder pile in the container will be almost exhausted, and accordingly, in combination with the external air pump connected with the first hose 7, the air with pressure is blown to the corner of the container through the second hose 9, so that the powder under the corner moves in disorder, and in combination with the continuous pumping force of the end 10, the remaining powder is guided into the pumping range of the end 10, and the pumping capacity of the pumping structure is further improved.

[0072] The contents that need to be further explained in the embodiment 1 and the embodiment 2 include that the powder pile is a magnetic powder pile, and in addition, the pumping mechanism is inserted into the magnetic powder pile and completes the corresponding pumping task.

[0073] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0074] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A suction mechanism, characterized by: The cannula, a number of second grooves around the cannula axis and arrayed in the cannula sidewall, and a tip inside the cannula; The tip is connected with a pipeline for connecting the pump group, and the tip is also provided with a tip extension block which extends into the second groove and guides the tip to slide along the second groove; The second groove is provided with an elastic member, and the second groove is also provided with a support rod which is spread outwards from the second groove or turns into the second groove, and the support rod is matched with a second hose which extends through the tip extension block and extends to the elastic member; The support rod is rotatable at the pivot / rotation joint of the support rod and the second groove, so as to switch between the "folded state of turning into the corresponding second groove" and the "spread out state of spreading outwards relative to the cannula"; Each tip extension block is provided with a signal rod, and each support rod is provided with a notch for guiding the signal rod to extend into the support rod; When all the support rods are turned into the corresponding second grooves and all the signal rods are inserted into the corresponding notches, the elastic member accumulates kinetic energy for spreading out the second groove, or when all the signal rods are pulled out of the corresponding notches, the elastic member releases the accumulated kinetic energy to guide all the support rods to spread outwards.

2. The suction mechanism according to claim 1, characterized in that: Before the cannula is inserted into the powder pile, all the support rods are turned into the corresponding second grooves, and all the signal rods are inserted into the corresponding notches, so that the elastic member accumulates kinetic energy for spreading out the second groove.

3. The suction mechanism of claim 2, wherein: After the cannula is inserted into the powder pile, all the support rods which spread outwards cut into the powder pile, so that the cannula is stably erected in the powder pile.

4. The suction mechanism of claim 3, wherein: The bottom opening of the cannula is filled with a blocking part which prevents powder from entering the cannula through the bottom opening when the cannula is inserted into the powder pile.

5. The suction mechanism of claim 4, wherein: A first groove corresponding to each second groove is arranged at the top opening of the cannula, and the first groove is used to fix the elastic member.

6. The suction mechanism of claim 5, wherein: The elastic member includes a first block fixed in the first groove, a second block located in the second groove and in sliding cooperation with the second groove, and a spring receiving the first block and the second block, wherein the second block is a fixed part of the second hose.

7. The suction mechanism of claim 1, wherein: The support rod and the second groove have a height difference at the pivot / rotation joint, which makes the second hose connected with the support rod inclined in the cannula when all the support rods spread outwards, and the inclined second hose is tightly pressed during the sliding of the tip relative to the second groove, guiding the support rod to further spread outwards.

8. The suction mechanism of claim 7, wherein: The first hose in communication with one end of the second hose is also included, and the first hose is provided with a first electromagnetic valve, and in addition, the other end of the second hose is provided with a second electromagnetic valve; The signal rod is used to control the first electromagnetic valve and the second electromagnetic valve, wherein the first electromagnetic valve and the second electromagnetic valve are in a closed state when the signal rod is inserted into the notch and the tip slides relative to the second groove, or the first electromagnetic valve and the second electromagnetic valve are in an open state when the tip falls to the final position and the signal rod contacts the second hose.

9. The suction mechanism of claim 8, wherein: The first electromagnetic valve and the second electromagnetic valve in the closed state squeeze the second hose when the powder enters the cannula from the second groove, so that the support rod which has spread outwards expands.

10. Use of a suction mechanism according to any one of claims 1-9 in the collection of magnetic particles, characterized in that: The powder pile is a magnetic powder pile, and the cannula is inserted into the magnetic powder pile, and all the support rods spread outwards and cut into the magnetic powder pile, so that the cannula is erected in the magnetic powder pile.

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