Pendulum powder suction mechanism

Abstract

This invention provides a pendulum-type powder suction mechanism, relating to the field of planetary ball mills, comprising: an upper plate and a lower plate, spaced apart from the upper plate; the lower plate having a central through hole; and a pendulum structure, the pendulum structure including a circular first limiting member and a second limiting member; the end face of the first limiting member having an oblong hole; the second limiting member being sleeved on the first limiting member via a first bearing; the second limiting member having a first through hole; and a limiting plate with a central second through hole at the upper end of the second limiting member, the second through hole being eccentrically positioned to the first through hole; the first and second limiting members rotating respectively; a suction pipe, the upper end of which is ball-jointed with the upper plate, and the lower end passing through the central through hole for suction of powder from the grinding jar; and a retaining structure, which abuts against the suction pipe to push the suction pipe against a semi-circular arc of the oblong hole, enabling the suction and collection of dust from the grinding jar during rotation, avoiding dead zones.

Description

Technical Field

[0001] This invention relates to the field of planetary ball mills, and particularly to a pendulum-type powder suction mechanism. Background Technology

[0002] A planetary ball mill is a common type of ball mill, which includes at least a grinding section and a feeding section. The grinding section revolves around the main wheel while rotating on its own axis in the opposite direction. Under the combined effect of these two motions, the grinding jar inside the grinding jar has greater grinding energy. The grinding jar crushes and refines the material inside the jar through collision and friction.

[0003] After the ball mill jar completes its compound motion, the suction section is usually used to remove the powder formed inside the ball mill jar. Preferably, the existing suction section is a direct insertion type, that is, the suction tube is inserted into the ball mill jar to pick up the powder. However, during the adsorption process, due to the limited negative pressure of the suction tube, the suction tube has difficulty collecting powder from a distance, resulting in powder residue inside the ball mill jar.

[0004] To better pick up powder and reduce powder residue, this application provides a pendulum-type powder picking mechanism. Summary of the Invention

[0005] This invention provides a pendulum-type powder suction mechanism, which aims to solve the problem that existing suction parts do not collect powder completely when collecting powder in the ball mill jar, resulting in powder residue.

[0006] To achieve the above objectives, embodiments of the present invention provide a pendulum-type powder suction mechanism, comprising:

[0007] upper plate;

[0008] A lower plate is vertically spaced from the upper plate. The lower plate has a central through hole and a swing angle structure. The swing angle structure includes a circular first limiting member and a second limiting member. The first limiting member and the second limiting member are coaxially arranged. The end face of the first limiting member has an oblong hole. The second limiting member is sleeved on the first limiting member through a first bearing. The second limiting member has a first through hole. The upper end of the second limiting member has a limiting plate with a central second through hole. The second through hole is eccentrically arranged with respect to the first through hole. The first limiting member and the second limiting member rotate on their own axes.

[0009] The suction pipe is ball-connected to the upper plate at the upper end and passes through the second through hole, the first through hole, the waist-shaped hole, and the central through hole at the lower end, and is used to suck up the powder in the grinding tank.

[0010] A retaining structure is provided on the lower end face of the first limiting member. The retaining structure abuts against the suction tube to push the suction tube against a semi-circular arc of the waist-shaped hole.

[0011] Preferably, the pendulum-type powder suction mechanism further includes a first power structure and a second power structure, wherein the first power structure drives the first limiting member to rotate, and the second power structure drives the second limiting member to rotate.

[0012] Preferably, the first power structure includes a first servo motor, the output end of the first servo motor is provided with a first bevel gear, a first transmission shaft is rotatably provided on the lower plate, the end of the first transmission shaft is provided with a second bevel gear that meshes with the first bevel gear, and a first gear is also fixed on the first transmission shaft;

[0013] The lower plate is also provided with a transition shaft, and a transition gear is provided on the transition shaft;

[0014] The first limiting member is provided with teeth in the circumferential direction, and the first gear engages with the teeth of the first limiting member through a transition gear.

[0015] Preferably, the second power structure includes a worm gear reducer, a second transmission shaft is provided on the lower plate, a second gear is provided on the second transmission shaft, and the worm gear reducer drives the second transmission shaft to rotate;

[0016] A third gear is also rotatably mounted on the first drive shaft;

[0017] The second limiting member is provided with teeth in the circumferential direction, and the second gear is driven by meshing with the teeth of the second limiting member through the third gear.

[0018] Preferably, the limiting plate is provided with four rectangular holes opened in the same direction, and the limiting plate is also provided with a bolt assembly, which passes through the rectangular holes and is screwed to the second limiting member.

[0019] Preferably, the pendulum-type powder suction mechanism further includes a lifting structure and a rotating structure. The upper plate and the lower plate are disposed on the lifting structure and are driven by the lifting structure to move up and down in the vertical direction. The rotating structure drives the lifting structure to rotate.

[0020] Preferably, a first column is provided between the upper plate and the lower plate, and the two ends of the first column are fixedly connected to the upper plate and the lower plate respectively;

[0021] The lifting structure includes a lead screw and a guide column. The lead screw is screwed to the upper plate and the lower plate, and the guide column passes through the upper plate and the lower plate.

[0022] The lifting structure also includes a lifting motor, which drives the lead screw to rotate.

[0023] Preferably, the suspended powder suction mechanism further includes a gantry frame;

[0024] The rotating structure includes a first electromagnetic brake, a second electromagnetic brake, and a rotating motor. The upper end of the lead screw passes through the first electromagnetic brake and is rotatably connected to the gantry frame; the lower end of the lead screw passes through the second electromagnetic brake and is connected to the lifting motor.

[0025] The rotating structure also includes a top plate and a bottom plate, with the upper and lower ends of the lead screw passing through the top plate and the bottom plate respectively, and the top and bottom ends of the guide column being fixed to the top plate and the bottom plate respectively.

[0026] A pulley is also rotatably mounted on the lead screw. The pulley is fixedly connected to the chassis and is driven by the sprocket of the rotating motor.

[0027] Preferably, the maintaining structure includes a fixed plate for fixing to the lower end face of the first limiting member, two fixed plates are spaced apart, and a movable plate is provided on the two fixed plates to slide along the direction of the center distance of the waist-shaped hole, the movable plate abutting the suction tube against a semi-circular arc of the waist-shaped hole;

[0028] A spring is provided on the movable plate, and the spring pushes the movable plate to move in a semi-circular arc direction of the waist-shaped hole.

[0029] The above-described solution of the present invention has the following beneficial effects:

[0030] In this application, the suction pipe is in an inclined state under the action of the maintaining structure and the swing angle structure, and with the cooperation of the second through hole and the waist-shaped hole, the suction pipe rotates with the joint bearing as the apex, which can suck up and collect the dust in the ball mill jar during rotation, avoiding leaving dead corners.

[0031] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0032] Figure 1 This is an overall schematic diagram of the present invention;

[0033] Figure 2 yes Figure 1 A diagram showing the hidden gantry frame;

[0034] Figure 3 yes Figure 2 Side view;

[0035] Figure 4 This is a structural diagram of the upper and lower plates;

[0036] Figure 5 This is a transmission diagram of the first power structure and the second power structure;

[0037] Figure 6 This is a schematic diagram of the structure.

[0038] Figure 7 This is a schematic diagram of the first and second limiting components and the limiting plate;

[0039] Figure 8 yes Figure 7 A longitudinal sectional view;

[0040] Figure 9 This is a schematic diagram of the first limiting component;

[0041] Figure 10 This is a schematic diagram of the movement trajectory of the suction pipe inside the ball mill jar.

[0042] [Explanation of Labels in the Attached Image]

[0043] 100-upper plate, 110-column

[0044] 200-Lower plate, 210-Center through hole, 220-Swing angle structure, 221-First limiting member, 221a-Oval hole, 222-Second limiting member, 222a-First through hole, 223-Limiting plate, 223a-Second through hole, 223b-Rectangular hole, 223c-Bearing protection

[0045] 300-Suction Tube

[0046] 400 - Maintaining structure, 410 - Fixed plate, 420 - Moving plate, 430 - Spring, 440 - Guide bearing.

[0047] 500 - First power structure, 510 - First servo motor, 520 - First bevel gear, 530 - First transmission shaft, 540 - Second bevel gear, 550 - First gear, 560 - Transition shaft, 570 - Transition gear.

[0048] 600 - Second power structure, 610 - Worm gear reducer, 620 - Second drive shaft, 630 - Second gear, 650 - Third gear

[0049] 700-Lifting structure, 710-Lead screw, 720-Guide column, 730-Lifting motor

[0050] 800-Rotating structure, 810-Gantry frame, 820-First electromagnetic brake, 830-Second electromagnetic brake, 840-Rotating motor, 850-Top plate, 860-Chassis, 870-Pulley, 880-Fixed plate. Detailed Implementation

[0051] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0052] like Figure 1-9 As shown, an embodiment of the present invention provides a pendulum-type powder suction mechanism, including an upper plate 100 and a lower plate 200, which are arranged at intervals in the vertical direction. The lower plate 200 has a central through hole 210 and a swing angle structure 220 is also provided on the lower plate 200. The swing angle structure 220 is located above the central through hole 210. The swing angle structure 220 includes a first limiting member 221 and a second limiting member 222. The outlines of the first limiting member 221 and the second limiting member 222 are both circular. The first limiting member 221 is rotatably disposed on the lower plate 200. The upper end face of the first limiting member 221 is provided with a waist-shaped hole 221a, which is located at the center of the upper end face of the first limiting member 221. The second limiting member 222 is sleeved on the first limiting member 221 through a first bearing, so that the second limiting member 222 can rotate independently on the first limiting member 221. A first through hole 222a is provided on the second limiting member 222, and the center of the first through hole 222a coincides with the midpoint connecting the centers of the two semicircles of the waist-shaped groove. A limiting plate 223 is provided at the upper end of the second limiting member 222, and a second through hole 223a is provided on the limiting plate 223. The limiting plate 223 rotates with the second limiting member 222, and the second through hole 223a is eccentrically set with the first through hole 222a. The first limiting member 221 and the second limiting member 222 rotate on their own axes respectively.

[0053] The pendulum-type powder suction mechanism also includes a suction pipe 300. The upper end of the suction pipe 300 is ball-jointed with the upper plate 100, and the lower end passes through the second through hole 223a, the first through hole 222a, the waist-shaped hole 221a, and the central through hole 210 before extending into the grinding jar. In this application, the upper plate 100 is provided with a spherical bearing, and the upper end of the suction pipe 300 is connected to the spherical bearing.

[0054] A retaining structure 400 is provided on the lower end face of the first limiting member 221. The retaining structure 400 pushes the suction tube 300 to abut against a semi-circular arc of the waist-shaped hole 221a.

[0055] An external connecting pipe is connected to the upper middle part of the suction pipe 300. A screen plate is installed inside the suction pipe 300.

[0056] In this embodiment, a second bearing is also provided between the first limiting member 221 and the lower plate 200 for the second limiting member 221 to rotate relative to the lower plate 200. Both the first through hole 222a and the second through hole 223a are circular holes.

[0057] In this application, the suction pipe 300 is in an inclined state under the action of the retaining structure 400 and the swing angle structure 220, and with the cooperation of the second through hole 223a and the waist-shaped hole 221a, the suction pipe 300 swings with the joint bearing as the apex, and the swing path is as follows: Figure 10As shown, the suction pipe 300 not only collects powder, but also collects dust along its path as the suction pipe 300 swings, making it more efficient and preventing dust from being left behind.

[0058] Furthermore, the pendulum-type powder suction mechanism also includes a first power structure 500 and a second power structure 600. The first power structure 500 is used to drive the first limiting member 221 to rotate, and the second power structure 600 is used to drive the second limiting member 222 to rotate.

[0059] Specifically, the first power structure 500 includes a first servo motor 510, with a first bevel gear 520 at its output end. A first drive shaft 530 is mounted on the lower plate 200, and a second bevel gear 540 is mounted at the top of the first drive shaft 530, meshing with the first bevel gear 520. The first drive shaft 530 is rotatably mounted on the lower plate 200. Preferably, a first fixed bearing is mounted at the lower end of the first drive shaft 530, connecting the first drive shaft 530 and the lower plate 200 and ensuring that the first drive shaft 530 rotates relative to the lower plate 200. A first gear 550 is also fixed on the first drive shaft 530, rotating with the rotation of the first drive shaft 530.

[0060] A transition shaft 560 is also provided on the lower plate 200. The transition shaft 560 is rotatably mounted on the lower plate 200, and a transition gear 570 is provided on the transition shaft 560. The transition gear 570 rotates with the rotation of the transition shaft 560. Preferably, a second fixed bearing is provided at the bottom end of the transition shaft 560. The second fixed bearing connects the transition shaft 560 and the lower plate 200 to ensure that the transition shaft 560 rotates relative to the lower plate 200.

[0061] The first limiting member 221 is also provided with teeth in the circumferential direction. The first gear 550 meshes with the teeth of the first limiting member 221 through the transition gear 570, driving the first limiting member 221 to rotate.

[0062] Furthermore, the second power structure 600 includes a worm gear reducer 610. A second drive shaft 620 is mounted on the lower plate 200, and the second drive shaft 620 is connected to the output end of the worm gear reducer 610 via a coupling. The second drive shaft 620 can rotate relative to the lower plate 200. A second gear 630 is fixed on the second drive shaft 620, and the second gear 630 rotates with the rotation of the second drive shaft 620. A third gear 650 is also mounted on the first drive shaft 530, and the third gear 650 is rotatably mounted on the first drive shaft 530, meshing with the second gear 630 for transmission.

[0063] The second limiting member 222 is also provided with teeth in the circumferential direction, and the third gear 650 meshes with the teeth on the second limiting member 222.

[0064] Furthermore, the limiting plate 223 is provided with four rectangular holes 223b arranged in the same direction. Bolt assemblies are provided on the limiting plate 223, passing through each rectangular hole 223b and screwed onto the second limiting member 222. The cooperation between the rectangular holes 223b and the bolt assemblies allows adjustment of the eccentricity between the second through hole 223a and the first through hole 222a on the limiting plate 223, thereby adjusting the cone angle and ensuring that the suction pipe 300 can be used with ball mill jars of different diameters.

[0065] Preferably, a protective bearing 223c is provided on the limiting plate 223. The protective bearing 223c is located at the second through hole 223a, and the inner ring of the protective bearing 223c has the same diameter as the second through hole 223a. The protective bearing 223c can protect the suction pipe 300. If the protective bearing 223c is not provided, the edge of the suction pipe 300 and the second through hole 223a will experience sliding friction. Over time, this will cause wear and leakage to the suction pipe 300, affecting its airtightness. After the protective bearing 223c is provided, the sliding friction experienced by the suction pipe 300 is converted into rolling friction between the inner and outer rings of the protective bearing 223c, reducing damage to the suction pipe 300.

[0066] Furthermore, this application also includes a lifting structure 700 and a rotating structure 800. The upper plate 100 and lower plate 200 are mounted on the lifting structure 700, and under the drive of the lifting structure 700, the upper plate 100 and lower plate 200 move vertically, facilitating the insertion or removal of the feed pipe from the grinding jar. The aforementioned lifting structure 700 is mounted on the rotating structure 800, which rotates the suction pipe 300, preventing the suction pipe 300 from interfering with the movement of the grinding jar during feeding and grinding.

[0067] Specifically, in order to ensure that the upper plate 100 and the lower plate 200 rise or rotate synchronously, a first column 110 is provided between the upper plate 100 and the lower plate 200, and the two ends of the first column 110 are fixedly connected to the upper plate 100 and the lower plate 200 respectively.

[0068] The lifting structure 700 includes a lead screw 710 and a guide column 720. The lead screw 710 is screwed to the upper plate 100 and the lower plate 200, and the guide column 720 passes through the upper plate 100 and the lower plate 200. The lifting structure 700 also includes a lifting motor 730, which drives the lead screw 710 to rotate. When the lifting motor 730 is working, under the action of the lead screw 710, the upper plate 100 and the lower plate 200 slide simultaneously along the direction of the guide column 720, realizing the lifting of the upper plate 100 and the lower plate 200.

[0069] The pendulum-type powder suction mechanism also includes a gantry 810, which is positioned above the upper plate 100.

[0070] The rotating structure 800 includes a first electromagnetic brake 820, a second electromagnetic brake 830, and a rotating motor 840. The upper end of the lead screw 710 passes through the first electromagnetic brake 820 and is rotatably connected to the gantry frame 810. The first electromagnetic fixing device is fixed on the gantry frame 810. The lower end of the lead screw 710 passes through the second electromagnetic brake 830 and is connected to the lifting motor 730.

[0071] The rotating structure 800 also includes a top plate 850 and a bottom plate 860. The upper and lower ends of the lead screw 710 are respectively inserted into the top plate 850 and the bottom plate 860, and the top and bottom ends of the guide column 720 are respectively fixed on the top plate 850 and the bottom plate 860.

[0072] The lead screw 710 is also equipped with a pulley 870, which is rotatably connected to the lead screw 710. The pulley 870 is also fixedly connected to the chassis 860 and can drive the chassis 860 to rotate around the lead screw 710. The pulley 870 is connected to the rotating motor 840 by a sprocket drive.

[0073] Below the second electromagnetic brake 830, a fixed plate 880 and a support are arranged in sequence. Below the support, a lifting motor 730 is installed. The aforementioned second electromagnetic brake 830 is mounted on the fixed plate 880. The output end of the lifting motor 730 passes through the support and is connected to a lead screw 710 below the second electromagnetic brake 830 via a connector. The aforementioned rotary motor 840 is fixed to the fixed plate 880.

[0074] Preferably, a mounting post is provided between the support and the fixed plate 880.

[0075] In this application, the lead screw 710 has threads in the portion between the top plate 850 and the bottom plate 860, and has a smooth shaft above the top plate 850 and below the bottom plate 860.

[0076] When it is necessary to raise or lower the upper plate 100 and the lower plate 200, the first electromagnetic brake 820 and the second electromagnetic brake 830 are de-energized, and the lifting motor 730 drives the lead screw 710 to rotate. Since the first electromagnetic brake 820 and the second electromagnetic brake 830 are de-energized, they will not hinder the rotation of the lead screw 710. At this time, the upper plate 100 and the lower plate 200 located on the lead screw 710 rise or fall along the direction of the guide column 720.

[0077] When the upper plate 100 and lower plate 200 need to rotate, the first electromagnetic brake 820 and the second electromagnetic brake 830 are energized. At this time, the first electromagnetic brake 820 and the second electromagnetic brake 830 clamp the lead screw 710, preventing the lead screw 710 from rotating. The rotating motor 840 operates, driving the pulley 870 to rotate through the sprocket drive. Since the pulley 870 is rotatably connected to the lead screw 710, the pulley 870 drives the chassis 860 to rotate around the lead screw 710, thereby causing the upper plate 100 and lower plate 200 to rotate around the lead screw 710.

[0078] The aforementioned retaining structure 400 includes a fixed plate 410. Two fixed plates 410 are spaced apart and disposed on the lower end surface of the first limiting member 221. A movable plate 420 is disposed on both fixed plates 410. The movable plate 420 slides on the fixed plate 410 along the direction of the center distance of the waist-shaped hole 221a. The movable plate 420 abuts the suction pipe 300 against a semi-circular arc of the waist-shaped hole 221a.

[0079] Two first ear plates are arranged on each fixed plate 410 along the center distance direction of the oblong hole 221a, and a second ear plate is arranged on the moving plate 420. Guide rods are passed through the two first ear plates and the second ear plate, and springs 430 are arranged on the guide rods. One end of the spring 430 abuts against the second ear plate, and the other end abuts against the first ear plate. Under the push of the spring 430, the moving plate 420 moves in a semi-circular arc direction of the oblong hole 221a, so that the suction pipe 300 maintains its tilted state.

[0080] Preferably, a guide bearing 440 is provided on the moving plate 420, and the guide bearing 440 is located on the side opposite to the direction of movement of the moving plate 420.

[0081] During the oscillation of the suction pipe 300, due to the presence of grinding balls inside the grinding jar, the suction pipe 300 will collide with the grinding balls, causing the suction pipe 300 to jump from the current semicircular arc to the other semicircular arc. At this time, under the push of the maintaining structure 400, the suction pipe 300 returns to the current semicircular arc, thus preventing the suction pipe 300 from missing.

[0082] Furthermore, since the grinding jar contains grinding balls and powder, it may tilt to varying degrees. Therefore, when the suction pipe 300 is pulled out of the grinding jar, it is necessary to ensure that the distance between the bottom end of the suction pipe 300 and the center of the grinding jar is less than the radius of the grinding jar. This is to prevent the suction pipe 300 from abutting against the upper edge of the grinding jar when it is inserted into the grinding jar next time. Therefore, this application also includes a first limit sensor and a second limit sensor. Both the first limit sensor and the second limit sensor are set on the lower plate 200. The first limit sensor is used to detect the first sensing element set on the suction pipe 300, and the second limit sensor is used to detect the second sensing element set on the second limit member 222. When the first limit sensor detects the first sensing element and the second limit sensor detects the second sensing element, the suction pipe 300 stops swinging, ensuring that the suction pipe 300 can be inserted into the grinding jar next time.

[0083] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pendulum-type powder suction mechanism, characterized in that, include: upper board(100); A lower plate (200) is vertically spaced from the upper plate (100). The lower plate (200) has a central through hole (210). The lower plate (200) also has a swing angle structure (220). The swing angle structure (220) includes a circular first limiting member (221) and a circular second limiting member (222). The first limiting member (221) and the second limiting member (222) are coaxially arranged. The end face of the first limiting member (221) has a waist-shaped hole (221a). The end face of the second limiting member (221a) has a waist-shaped hole (221a). 22) The first bearing is sleeved on the first limiting member (221). The second limiting member (222) has a first through hole (222a). The upper end of the second limiting member (222) is provided with a limiting plate (223) with a second through hole (223a) in the center. The limiting plate (223) rotates with the second limiting member (222). The second through hole (223a) is eccentrically set with the first through hole (222a). The first limiting member (221) and the second limiting member (222) rotate on their own axes respectively. The suction pipe (300) is ball-connected to the upper plate (100) at its upper end and passes through the second through hole (223a), the first through hole (222a), the waist-shaped hole (221a), and the central through hole (210) at its lower end and is used to suck up powder in the grinding tank. A retaining structure (400) is disposed on the lower end face of the first limiting member (221). The retaining structure (400) abuts against the suction tube (300) to push the suction tube (300) against a semi-circular arc of the waist-shaped hole (221a).

2. The pendulum-type powder suction mechanism according to claim 1, characterized in that: The pendulum-type powder suction mechanism also includes a first power structure (500) and a second power structure (600). The first power structure (500) drives the first limiting member (221) to rotate, and the second power structure (600) drives the second limiting member (222) to rotate.

3. The pendulum-type powder suction mechanism according to claim 2, characterized in that: The first power structure (500) includes a first servo motor (510), the output end of the first servo motor (510) is provided with a first bevel gear (520), a first transmission shaft (530) is rotatably provided on the lower plate (200), the end of the first transmission shaft (530) is provided with a second bevel gear (540) that meshes with the first bevel gear (520), and a first gear (550) is also fixed on the first transmission shaft (530). The lower plate (200) is also provided with a transition shaft (560), and the transition shaft (560) is provided with a transition gear (570). The first limiting member (221) is provided with teeth in the circumferential direction, and the first gear (550) is driven by meshing with the teeth of the first limiting member (221) through the transition gear (570).

4. The pendulum-type powder suction mechanism according to claim 3, characterized in that: The second power structure (600) includes a worm gear reducer (610), a second transmission shaft (620) is provided on the lower plate (200), a second gear (630) is provided on the second transmission shaft (620), and the worm gear reducer (610) drives the second transmission shaft (620) to rotate; A third gear (650) is also rotatably mounted on the first drive shaft (530); The second limiting member (222) is provided with teeth in the circumferential direction, and the second gear (630) is driven by meshing with the teeth of the second limiting member (222) through the third gear (650).

5. The pendulum-type powder suction mechanism according to claim 1, characterized in that: The limiting plate (223) is provided with four rectangular holes (223b) opened in the same direction. The limiting plate (223) is also provided with a bolt assembly, which passes through the rectangular holes (223b) and is screwed to the second limiting member (222).

6. The pendulum-type powder suction mechanism according to claim 1, characterized in that: The pendulum-type powder suction mechanism also includes a lifting structure (700) and a rotating structure (800). The upper plate (100) and the lower plate (200) are mounted on the lifting structure (700) and are driven by the lifting structure (700) to move up and down in the vertical direction. The rotating structure (800) drives the lifting structure (700) to rotate.

7. The pendulum-type powder suction mechanism according to claim 6, characterized in that: A first column (110) is provided between the upper plate (100) and the lower plate (200), and the two ends of the first column (110) are fixedly connected to the upper plate (100) and the lower plate (200) respectively; The lifting structure (700) includes a lead screw (710) and a guide column (720). The lead screw (710) is screwed to the upper plate (100) and the lower plate (200), and the guide column (720) passes through the upper plate (100) and the lower plate (200). The lifting structure (700) also includes a lifting motor (730), which drives the lead screw (710) to rotate.

8. The pendulum-type powder suction mechanism according to claim 7, characterized in that: The suspended powder suction mechanism also includes a gantry (810). The rotating structure (800) includes a first electromagnetic brake (820), a second electromagnetic brake (830), and a rotating motor (840). The upper end of the lead screw (710) passes through the first electromagnetic brake (820) and is rotatably connected to the gantry frame (810); the lower end of the lead screw (710) passes through the second electromagnetic brake (830) and is connected to the lifting motor (730). The rotating structure (800) also includes a top plate (850) and a bottom plate (860). The upper and lower ends of the lead screw (710) are respectively inserted into the top plate (850) and the bottom plate (860). The top and bottom ends of the guide column (720) are respectively fixed to the top plate (850) and the bottom plate (860). A pulley (870) is rotatably mounted on the lead screw (710). The pulley (870) is fixedly connected to the chassis (860), and the pulley (870) is driven by the sprocket of the rotating motor (840).

9. The pendulum-type powder suction mechanism according to claim 1, characterized in that: The retaining structure (400) includes a fixed plate (410) for fixing to the lower end face of the first limiting member (221), two fixed plates (410) are spaced apart, and a movable plate (420) is provided on the two fixed plates (410) to slide along the center distance direction of the waist-shaped hole (221a), the movable plate (420) abuts the suction pipe (300) against a semi-circular arc of the waist-shaped hole (221a); A spring (430) is provided on the movable plate (420), and the spring (430) pushes the movable plate (420) to move in a semi-circular arc direction of the waist-shaped hole (221a).

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