Pendulum type powder suction mechanism

Abstract

The invention provides a dangling type powder suction mechanism, and relates to the field of planetary ball mills, the dangling type powder suction mechanism comprises an upper plate and a lower plate, the upper plate and the lower plate are arranged at an interval, the lower plate is provided with a central through hole, the lower plate is further provided with a swing angle structure, the swing angle structure comprises a first circular limiting piece and a second circular limiting piece, and the end face of the first limiting piece is provided with a kidney-shaped hole; the second limiting piece is arranged on the first limiting piece in a sleeving mode through a first bearing, a first through hole is formed in the second limiting piece, a limiting plate with a second through hole formed in the center is arranged at the upper end of the second limiting piece, the second through hole and the first through hole are eccentrically arranged, and the first limiting piece and the second limiting piece rotate respectively; the upper end of the suction pipe is in ball joint with the upper plate, and the lower end of the suction pipe penetrates through the central through hole and is used for sucking powder in the grinding tank; the maintaining structure abuts against the material suction pipe so as to push the material suction pipe to abut against one semicircular arc of the kidney-shaped hole, dust in the ball milling tank can be sucked and collected in the rotating process, and dead angles are avoided.

Description

Technical Field

[0001] The invention relates to the field of planetary ball mills, and in particular to a pendulum-type powder suction mechanism. Background Art

[0002] Planetary ball mill is a common ball mill, which at least includes a ball milling part and a suction part. The ball milling part revolves on the main wheel through the ball mill jar while rotating in the opposite direction. Under the combination of the two movements, the grinding inside the ball mill jar has greater grinding energy. The ball mill jar crushes and refines the material in the jar through collision and friction.

[0003] After the ball mill completes the compound movement, the suction part is usually used to absorb the powder formed by grinding in the ball mill. Preferably, the existing suction part is a direct insertion type, that is, the suction pipe is inserted into the ball mill to absorb the powder. However, during the adsorption process, the suction pipe is limited by the negative pressure of the suction pipe, and it is difficult for the suction pipe to collect the powder far away, resulting in powder residue in the ball mill.

[0004] In order to better absorb powder and reduce powder residue, the present application provides a pendulum-type powder absorption mechanism. Summary of the invention

[0005] The invention provides a pendulum-type powder suction mechanism, which aims to solve the problem that the existing suction part does not collect powder cleanly in a ball mill, resulting in powder residue.

[0006] In order to achieve the above object, an embodiment of the present invention provides a pendulum-type powder suction mechanism, comprising:

[0007] upper plate;

[0008] A lower plate is arranged with an interval from the upper plate in the vertical direction, the lower plate is provided with a central through hole, and a swing angle structure is also provided on the lower plate, the swing angle structure includes a first and a second circular limiting member, the first and the second limiting members are coaxially arranged, the end surface of the first limiting member is provided with a waist-shaped hole, the second limiting member is sleeved on the first limiting member through a first bearing, the second limiting member is provided with a first through hole, the upper end of the second limiting member is provided with a limiting plate with a second through hole in the center, the second through hole is eccentrically arranged with the first through hole, and the first and the second limiting members are respectively rotated;

[0009] The suction pipe has an upper end connected to the upper plate ball, and a lower end passing through the second through hole, the first through hole, the waist-shaped hole, and the central through hole and is used to suck the powder in the grinding jar;

[0010] A maintaining structure is arranged on the lower end surface of the first limiting member, and the maintaining structure abuts against the suction pipe to push the suction pipe to abut against a semicircular 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 limit member to rotate, and the second power structure drives the second limit member to rotate.

[0012] Preferably, the first power structure comprises a first servo motor, an 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, a second bevel gear meshing with the first bevel gear is provided at the end of the first transmission shaft, and a first gear is also fixed on the first transmission shaft;

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

[0014] The first limit member is provided with teeth in the circumferential direction, and the first gear is meshed with the teeth of the first limit member through a transition gear for transmission.

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

[0016] A third gear is also rotatably arranged on the first transmission shaft;

[0017] The second position-limiting member is provided with teeth in the circumferential direction, and the second gear is meshed with the teeth of the second position-limiting member through the third gear for transmission.

[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 comprises a lifting structure and a rotating structure, the upper plate and the lower plate are arranged on the lifting structure and driven by the lifting structure to lift and lower in a vertical direction, and 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 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 is penetrated through the upper plate and the lower plate;

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

[0023] Preferably, the pendulum-type powder suction mechanism further comprises a gantry;

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

[0025] The rotating structure further includes a top plate and a bottom plate, the upper end and the lower end of the lead screw are respectively passed through the top plate and the bottom plate, and the top end and the bottom end of the guide column are respectively fixed to the top plate and the bottom plate;

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

[0027] Preferably, the maintaining structure comprises a fixed plate for fixing on the lower end surface of the first limiter, the two fixed plates are arranged at intervals, and the two fixed plates are provided with a movable plate sliding along the center distance direction of the waist-shaped hole, and the movable plate abuts the suction tube against a semicircular arc of the waist-shaped hole;

[0028] The movable plate is provided with a spring, and the spring pushes the movable plate to move in a semicircular arc direction of the waist-shaped hole.

[0029] The above scheme of the present invention has the following beneficial effects:

[0030] In the present 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 vertex, and can absorb and collect the dust in the ball mill during rotation to avoid leaving dead corners.

[0031] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0033] Figure 2 yes Figure 1 Schematic diagram behind the hidden gantry;

[0034] Figure 3 yes Figure 2 Side view of

[0035] Figure 4 It is a schematic diagram of the structure between the upper plate and the lower plate;

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

[0037] Figure 6 It is a schematic diagram of the maintenance structure;

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

[0039] Figure 8 yes Figure 7 A longitudinal cross-sectional view of

[0040] Fig. 9 is a schematic diagram of a first limiting member;

[0041] Fig.10 This is a schematic diagram of the movement trajectory of the suction tube in the ball mill.

[0042] [Description of Reference Numerals]

[0043] 100-upper plate, 110-column

[0044] 200-lower plate, 210-center through hole, 220-swing angle structure, 221-first limiter, 221a-waist-shaped hole, 222-second limiter, 222a-first through hole, 223-limiting plate, 223a-second through hole, 223b-rectangular hole, 223c-protective bearing,

[0045] 300-Suction pipe,

[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 transmission shaft, 630-second gear, 650-third gear,

[0049] 700-lifting structure, 710-screw, 720-guide column, 730-lifting motor,

[0050] 800 - rotating structure, 810 - gantry, 820 - first electromagnetic brake, 830 - second electromagnetic brake, 840 - rotating motor, 850 - top plate, 860 - bottom plate, 870 - pulley, 880 - fixed plate. DETAILED DESCRIPTION

[0051] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0052] like Figure 1-9 As shown, an embodiment of the present invention provides a suspended powder suction mechanism, including an upper plate 100 and a lower plate 200, the upper plate 100 and the lower plate 200 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 arranged 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 limit member 221 and a second limit member 222, the contours of the first limit member 221 and the second limit member 222 are both circular, wherein the first limit member 221 is rotatably arranged on the lower plate 200. A waist-shaped hole 221a is provided on the upper end surface of the first limiting member 221, and the waist-shaped hole 221a is located at the center of the upper end surface of the first limiting member 221. The second limiting member 222 is arranged on the first limiting member 221 through the first bearing sleeve, 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 of the connection between the centers of the two semicircular arcs 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 arranged with the first through hole 222a, and the first limiting member 221 and the second limiting member 222 rotate respectively.

[0053] The pendulum-type powder suction mechanism further includes a suction pipe 300, the upper end of which is ball-jointed with the upper plate 100, and the lower end of which extends into the grinding jar after passing through the second through hole 223a, the first through hole 222a, the waist-shaped hole 221a and the central through hole 210. In the present application, the upper plate 100 is provided with a joint bearing, and the upper end of the suction pipe 300 is connected to the joint bearing.

[0054] A maintaining structure 400 is disposed on the lower end surface of the first limiting member 221 , and the maintaining structure 400 pushes the suction tube 300 to abut against a semicircular arc of the waist-shaped hole 221 a .

[0055] An external pipe is connected to the upper middle portion of the suction pipe 300. A sieve plate is arranged 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. The first through hole 222a and the second through hole 223a are both circular holes.

[0057] In the present application, the suction pipe 300 is in an inclined state under the action of the maintaining structure 400 and the swing angle structure 220, and under 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 vertex, and the swing path is as follows: Fig.10As shown, the suction pipe 300 can not only collect powder, but also collect dust along the way as the suction pipe 300 swings, which is more efficient and avoids dust residue.

[0058] Furthermore, the pendulum-type powder suction mechanism further 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, a first bevel gear 520 is provided at the output end of the first servo motor 510, a first transmission shaft 530 is provided on the lower plate 200, a second bevel gear 540 is provided at the top end of the first transmission shaft 530, the second bevel gear 540 is meshed with the first bevel gear 520, and the first transmission shaft 530 is rotatably provided on the lower plate 200. Preferably, a first fixed bearing is provided at the lower end of the first transmission shaft 530, the first fixed bearing connects the first transmission shaft 530 and the lower plate 200, and ensures that the first transmission shaft 530 rotates relative to the lower plate 200, and a first gear 550 is also fixed on the first transmission shaft 530, and the first gear 550 rotates with the rotation of the first transmission shaft 530.

[0060] A transition shaft 560 is also provided on the lower plate 200, and the transition shaft 560 is rotatably provided on the lower plate 200. A transition gear 570 is provided on the transition shaft 560, and 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, and 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] Teeth are further provided on the circumference of the first limiting member 221 , and the first gear 550 is meshed with the teeth of the first limiting member 221 through the transition gear 570 to drive the first limiting member 221 to rotate.

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

[0063] Teeth are also provided on the circumference of the second limiting member 222 , 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, and the limiting plate 223 is provided with a bolt assembly, which is passed through each rectangular hole 223b and is screwed with the second limiting member 222. The cooperation between the rectangular hole 223b and the bolt assembly can adjust the eccentricity between the second through hole 223a and the first through hole 222a on the limiting plate 223, and then adjust the cone angle to ensure that the suction pipe 300 can be applied to ball mills of different diameters.

[0065] Preferably, a protective bearing 223c is provided on the limit plate 223, and the protective bearing 223c is provided at the second through hole 223a. The inner ring of the protective bearing 223c has the same aperture as the second through hole 223a, and the protective bearing 223c can protect the suction pipe 300. If the protective bearing 223c is not provided, the suction pipe 300 and the edge of the second through hole 223a are in sliding friction, which may cause wear and leakage to the suction pipe 300 after long-term use, affecting the air tightness of the suction pipe 300. After the protective bearing 223c is provided, the sliding friction suffered by the suction pipe 300 is converted into rolling friction between the inner ring and the outer ring of the protective bearing 223c, thereby reducing damage to the suction pipe 300.

[0066] Furthermore, the present application also includes a lifting structure 700 and a rotating structure 800, and the upper plate 100 and the lower plate 200 are arranged on the lifting structure 700, and driven by the lifting structure 700, the upper plate 100 and the lower plate 200 are lifted and lowered in the vertical direction, so that the feeding tube can be inserted into or pulled out of the ball mill. The aforementioned lifting structure 700 is arranged on the rotating structure 800, and the suction tube 300 is rotated by the rotating structure 800 to prevent the suction tube 300 from interfering with the movement of the ball mill during feeding and ball milling.

[0067] Specifically, in order to ensure that the upper plate 100 and the lower plate 200 are lifted or rotated synchronously, a first column 110 is provided between the upper plate 100 and the lower plate 200 , and both 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 is passed 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 along the direction of the guide column 720 at the same time, so as to realize the lifting of the upper plate 100 and the lower plate 200.

[0069] The pendulum-type powder suction mechanism further includes a gantry 810 , which is disposed 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 is passed through the first electromagnetic brake 820 and is rotatably connected to the gantry 810. The first electromagnetic fixer is fixed on the gantry 810. The lower end of the lead screw 710 is passed through the second electromagnetic brake 830 and is connected to the lifting motor 730.

[0071] The rotating structure 800 further includes a top plate 850 and a bottom plate 860 . The upper end and the lower end of the lead screw 710 are respectively passed through the top plate 850 and the bottom plate 860 . The top end and the bottom end of the guide column 720 are respectively fixed on the top plate 850 and the bottom plate 860 .

[0072] A pulley 870 is also provided on the lead screw 710 , and the pulley 870 is rotationally 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 . A sprocket transmission is provided between the pulley 870 and the rotating motor 840 .

[0073] A fixed plate 880 and a support are sequentially arranged below the second electromagnetic brake 830, and a lifting motor 730 is arranged below the support. The aforementioned second electromagnetic brake 830 is mounted on the fixed plate 880, and the output end of the lifting motor 730 is passed through the support and connected to the lead screw 710 through a connector below the second electromagnetic brake 830. The aforementioned rotating motor 840 is fixed on the fixed plate 880.

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

[0075] In the present application, the portion of the lead screw 710 between the top plate 850 and the bottom plate 860 has threads, and the optical axis is above the top plate 850 and below the bottom plate 860 .

[0076] When the upper plate 100 and the lower plate 200 need to be lifted or lowered, the first electromagnetic brake 820 and the second electromagnetic brake 830 are powered off, and the lifting motor 730 drives the lead screw 710 to rotate. The first electromagnetic brake 820 and the second electromagnetic brake 830 will not block the rotation of the lead screw 710 due to power failure. 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 the lower plate 200 need to rotate, the first electromagnetic brake 820 and the second electromagnetic brake 830 are energized, and the first electromagnetic brake 820 and the second electromagnetic brake 830 clamp the lead screw 710, so that the lead screw 710 cannot rotate. The rotating motor 840 works, and drives the pulley 870 to rotate through the sprocket transmission. Since the pulley 870 and the lead screw 710 are rotatably connected, the pulley 870 drives the chassis 860 to rotate around the lead screw 710, so that the upper plate 100 and the lower plate 200 rotate around the lead screw 710.

[0078] The aforementioned maintaining structure 400 includes a fixed plate 410, and two fixed plates 410 are arranged at intervals on the lower end surface of the first limit member 221. A movable plate 420 is commonly arranged on the two 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, and the movable plate 420 abuts the suction tube 300 on a semicircular 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 waist-shaped hole 221a, and a second ear plate is arranged on the movable plate 420. Guide rods are passed through the two first ear plates and the second ear plates, and a spring 430 is arranged on the guide rod. 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 movable plate 420 moves in a semicircular arc direction of the waist-shaped hole 221a, so that the suction pipe 300 maintains a normal state of inclination.

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

[0081] During the swinging process of the suction pipe 300, due to the grinding balls in the ball mill, the suction pipe 300 will collide with the grinding balls, causing the suction pipe 300 to jump from the current semi-arc to the other semi-arc direction. At this time, under the push of the maintaining structure 400, the suction pipe 300 returns to the current semi-arc again to avoid suction leakage of the suction pipe 300.

[0082] Furthermore, since there are grinding balls and powder in the ball mill, the ball mill will tilt to varying degrees. Therefore, when the suction tube 300 is pulled out of the ball mill, it is necessary to ensure that the distance between the bottom end of the suction tube 300 and the center of the ball mill is less than the radius of the ball mill to avoid the suction tube 300 from abutting against the upper edge of the ball mill when it is inserted into the ball mill next time. Therefore, the present application also includes a first limit sensor and a second limit sensor. The first limit sensor and the second limit sensor are both arranged on the lower plate 200. The first limit sensor is used to detect a first sensing element arranged on the suction tube 300, and the second limit sensor is used to detect a second sensing element arranged 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 tube 300 stops swinging to ensure that the suction tube 300 can be inserted into the ball mill next time.

[0083] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pendulum-type powder suction mechanism, characterized in that: include: upper board(100); The lower plate (200) is arranged at intervals with the upper plate (100) in the vertical direction, the lower plate (200) is provided with a central through hole (210), and the lower plate (200) is also provided with a swing angle structure (220), the swing angle structure (220) comprises a first circular limiting member (221) and a second limiting member (222), the first limiting member (221) and the second limiting member (222) are coaxially arranged, and the end surface of the first limiting member (221) is provided with a waist-shaped hole (221). a), the second limiting member (222) is sleeved on the first limiting member (221) via a first bearing, the second limiting member (222) is provided with a first through hole (222a), a limiting plate (223) with a second through hole (223a) provided at the center is provided at the upper end of the second limiting member (222), the second through hole (223a) is eccentrically arranged with the first through hole (222a), and the first limiting member (221) and the second limiting member (222) are respectively self-rotating; The suction pipe (300) has an upper end that is ball-jointed to the upper plate (100), and a lower end that is passed through the second through hole (223a), the first through hole (222a), the waist-shaped hole (221a), and the central through hole (210) and is used to absorb the powder in the grinding jar; A maintaining structure (400) is arranged on the lower end surface of the first limiting member (221), and the maintaining structure (400) abuts against the suction pipe (300) to push the suction pipe (300) to abut against a semicircular 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 further comprises a first power structure (500) and a second power structure (600), wherein the first power structure (500) drives the first limit member (221) to rotate, and the second power structure (600) drives the second limit member (222) to rotate.

3. The pendulum-type powder suction mechanism according to claim 2, characterized in that: The first power structure (500) comprises 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), a second bevel gear (540) meshing with the first bevel gear (520) is provided at the end of the first transmission shaft (530), 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 meshed with the teeth of the first limiting member (221) for transmission via a transition gear (570).

4. The pendulum-type powder suction mechanism according to claim 3, characterized in that: The second power structure (600) comprises a worm gear reducer (610), a second transmission shaft (620) is arranged on the lower plate (200), a second gear (630) is arranged 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 disposed on the first transmission shaft (530); The second position-limiting member (222) is provided with teeth in the circumferential direction, and the second gear (630) is meshed with the teeth of the second position-limiting member (222) for transmission via 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), wherein the upper plate (100) and the lower plate (200) are arranged on the lifting structure (700) and driven by the lifting structure (700) to lift and lower in a vertical direction, and the rotating structure (800) drives the lifting structure (700) to rotate.

7. The magnetic attraction mechanism according to claim 6, characterized in that: A first column (110) is disposed between the upper plate (100) and the lower plate (200), and two ends of the first column (110) are respectively fixedly connected to the upper plate (100) and the lower plate (200); The lifting structure (700) comprises a lead screw (710) and a guide column (720), wherein the lead screw (710) is screwed to the upper plate (100) and the lower plate (200), and the guide column (720) is passed through the upper plate (100) and the lower plate (200); The lifting structure (700) further comprises a lifting motor (730), and the lifting motor (730) drives the lead screw (710) to rotate.

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

9. The pendulum-type powder suction mechanism according to claim 1, characterized in that: The maintaining structure (400) comprises a fixed plate (410) for fixing on the lower end surface of the first limiting member (221), the two fixed plates (410) are arranged at an interval, and a movable plate (420) is arranged on the two fixed plates (410) for sliding along the center distance direction of the waist-shaped hole (221a), and the movable plate (420) makes the suction pipe (300) abut against a semicircular 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 semicircular arc direction of the waist-shaped hole (221a).

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