Anti-blocking device for powder coating hopper

Abstract

The invention discloses a powder coating hopper anti-blocking device, and relates to the technical field of anti-blocking devices, the powder coating hopper anti-blocking device comprises a screening structure, the screening structure comprises a screening assembly and a guide assembly, the guide assembly and the screening assembly are driven to move synchronously to screen powder coatings, and the powder coatings are screened through the synergistic effect of a reflecting plate, a barrier plate and a triangular guide plate and the matched use of a spiral structure; the guiding assembly and the screening assembly are driven to synchronously move so as to screen powder coating, and effective separation of fine-particle coating and large-particle coating is achieved. The reflecting plate is obliquely mounted, and the kinetic energy advantage of large-particle coating is utilized to guide the large-particle coating into the powder storage area; the fine-particle coating is effectively blocked from passing through the blocking plate; the inclined plane design of the triangular guide plate ensures that the large-particle coating can smoothly slide to the coarse material outlet, the accuracy and reliability of the screening result are ensured, and meanwhile, the screening assembly is arranged below the emptying hopper, so that the undesirable phenomenon of dust diffusion caused by flying of the fine-particle coating can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of anti-blocking devices, in particular to an anti-blocking device for a powder coating hopper. Background Art

[0002] Large particle coating is a solid powdered synthetic resin coating composed of solid resin, pigment, filler and additives. Unlike ordinary solvent-based coating and water-based coating, its dispersion medium is not solvent and water, but air. It has the characteristics of no solvent pollution, 100% film formation and low energy consumption. Large particle coatings are divided into two categories: thermoplastic and thermosetting. The film appearance of thermoplastic large particle coating is poor, and the adhesion between it and metal is also poor, so it is rarely used in the field of automobile painting. Automobile painting generally uses thermosetting large particle coating. Thermosetting large particle coating uses thermosetting synthetic resin as film-forming powder. During the drying process, the resin first melts and then solidifies into a smooth and hard coating film after chemical cross-linking. The film appearance, various mechanical properties and corrosion resistance formed by this kind of coating can meet the requirements of automobile painting.

[0003] A Chinese patent with authorization announcement number CN221739313U discloses a powder coating hopper anti-blocking device, including a conveying mechanism installed at the bottom of the coating hopper; the conveying mechanism includes a connecting pipe fixedly connected to the bottom end of the coating hopper, the bottom end of the connecting pipe is fixedly connected to a conveying pipe, the interior of the conveying pipe is movably connected to a spiral conveying rod through a bearing, one end of the spiral conveying rod passes through the conveying pipe and extends out of one side of the conveying pipe, one end of the spiral conveying rod extending out of one side of the conveying pipe is fixedly provided with a first motor, the first motor is fixed to one side of the conveying pipe through a bracket, and is used to convey powder, and the powder coating During the extrusion process, the material forms block paint. The second motor is started, and the second motor can drive the first rotating shaft to rotate. The first rotating shaft can drive the breaking rod to rotate. The breaking rod can break up the block paint to prevent the paint from clogging the connecting pipe. The powder paint falls into the conveying pipe through the connecting pipe. The first motor is started, and the first motor can drive the spiral conveying rod to rotate. The spiral conveying rod can convey the powder paint. Compared with the prior art in which a spring is used to drive a push plate to extrude materials to avoid accumulation, this patent can prevent paint from accumulating inside the paint hopper through a conveying mechanism and a breaking mechanism, thereby achieving an anti-clogging effect.

[0004] Large-particle coatings may experience blockage during use. The different sizes of powder particles can easily lead to unstable fluidization state. Fine particles are easily "entrained" by large particles and form local accumulation. At the same time, due to the high surface energy between fine powders, agglomeration is prone to occur, further exacerbating the risk of blockage. In order to solve the above problems, vibrators and screening devices are often installed on the hopper. The vibrator is used to generate vibration to help loosen the powder, and the screening device is used to ensure that the powder particles entering the hopper are of uniform size.

[0005] The working principle of the screening device is based on the filtering effect of the screen. When the powder passes through the screen, fine particles smaller than the size of the screen hole will fall through the screen into the collection area below, while large particles larger than the size of the screen hole will remain above the screen and need to be further processed or reprocessed. There are generally two ways to deal with large particles larger than the size of the screen hole. One is to shut down the machine regularly and manually clean out the large particles above the screen; the other is to install an air blowing system above the screen to remove large particles regularly or continuously. However, during the air blowing process, high-speed airflow may cause large particles of paint to fly, causing dust to spread. The flying dust requires additional dust collection devices to recover, which increases the complexity and cost of the equipment. In addition, different particle characteristics require different air flow rates, and it is difficult to accurately adjust the air flow rate to adapt to different particle characteristics of large particles of paint.

[0006] To this end, the present invention proposes a powder coating hopper anti-blocking device to solve the above-mentioned problem. Summary of the invention

[0007] In view of the above problems in the prior art, the present invention is proposed.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a powder coating hopper anti-blocking device, comprising an emptying hopper, wherein the bottom end of the emptying hopper is provided with a plurality of guide ports for discharging materials in batches;

[0009] A spiral structure is inserted into the guide port of the emptying bucket and rotates to stir the powder coating to break the agglomerated structure of the powder coating, so as to drive the powder coating to fall into the guide port under gravity and be emptied;

[0010] A driving structure, the driving structure comprising a driving unit and an acting unit, the driving unit driving the spiral structure to rotate through the acting unit;

[0011] The screening structure includes a screening component and a guide component. The spiral structure acts on the screening component to drive the guide component and the screening component to move synchronously to screen the powder coating. The guide component includes a reflector, a baffle plate and a triangular guide plate. The baffle plate is connected to the bottom of the triangular guide plate and forms a powder retention area with the triangular guide plate. The reflector is arranged above the baffle plate and forms a certain angle with the baffle plate. Large particles of coating that fall into the screening component through the guide port are accelerated and impact the baffle plate. The large particles of coating are guided and ejected by the baffle plate and reflected by the reflector plate, and jump into the powder retention area for screening.

[0012] As a preferred solution of the anti-blocking device for the powder coating hopper of the present invention, the screening assembly includes a screening disc and a rectangular rack, the rectangular rack is fixed to the bottom of the screening disc and meshes with the spiral structure, the spiral structure drives the screening disc to reciprocate linear motion through the rectangular rack, and the screening disc in reciprocating linear motion acts on large particle coating to generate speed;

[0013] The screening disc is composed of a screen at the bottom and a frame plate enclosed on the side of the screen. The holes formed on the surface of the screen are fine material outlets. A coarse material outlet is provided on the side of the screening disc facing the main hopper, and the large particles of paint generated at a high speed are discharged through the coarse material outlet.

[0014] As a preferred solution of the anti-blocking device for the powder coating hopper of the present invention, wherein: a coaxial main hopper is fixed to the outer wall of the emptying hopper, and the main hopper comprises an annular cylinder and a conical cylinder connected by flanges, the upper end of the annular cylinder is set as a feed port, and the lower end of the conical cylinder is set as a main discharge port;

[0015] A conical protrusion extends upward from the center of the emptying bucket, and an arc passage for accommodating large particles of paint is formed between the inner wall of the emptying bucket and the conical protrusion. A plurality of circular holes are vertically penetrated at equal intervals on the surface of the arc passage, and a guide plate is enclosed at each circular hole, and the lower port of the guide plate is formed as a guide port.

[0016] As a preferred solution of the anti-blocking device for the powder coating hopper of the present invention, the spiral structure includes a spiral shaft and spiral blades, the spiral shaft extends along the guide port in the emptying bucket to the lower part of the emptying bucket, the spiral blades are spirally arranged on the upper part of the spiral shaft, and the spiral blades are driven by the spiral shaft to rotate to act on large particles of coating to loosen the large particles of coating;

[0017] The spiral structure also includes a scraper blade arranged in the middle of the spiral shaft. The scraper blade is closely attached to the guide plate and is driven to rotate by the spiral shaft. The rotating scraper blade scrapes off the residual powder on the guide plate.

[0018] As a preferred solution of the anti-blocking device for the powder coating hopper of the present invention, wherein: the spiral structure further comprises a gear set arranged at the bottom of the spiral shaft, and the gear set comprises a half-tooth gear and a ring gear;

[0019] The driving unit includes a driving motor and an extension rod connected to the end of the output shaft of the driving motor. The acting unit is configured as an acting gear located at the bottom end of the extension rod and coaxially arranged. The driving motor drives the acting gear to rotate through the extension rod to mesh with the ring gear for transmission.

[0020] As a preferred solution of the powder coating hopper anti-blocking device of the present invention, the ring gear acts on the half-tooth gear through the spiral shaft, so that the half-tooth gear is intermittently meshed with the two rows of rectangular racks to drive the screening disk to reciprocate linear displacement.

[0021] As a preferred solution of the powder coating hopper anti-blocking device of the present invention, the outer wall of the screening disk located at the coarse material outlet is fixed with an external plate for adjusting the movement trajectory of large particle coating, and the large particle coating passing through the coarse material outlet is supported by the external plate and changes the projection trajectory.

[0022] As a preferred solution of the powder coating hopper anti-blocking device described in the present invention, a linear guide rail for supporting the screening disc is fixed to the inner wall of the annular cylinder, and a guide rail slider is fixed to the surface of the screening disc, the guide rail slider is engaged with the linear guide rail, and the screening disc is driven by external force to run along the track surface of the linear guide rail through the guide rail slider.

[0023] As a preferred solution of the powder coating hopper anti-blocking device described in the present invention, a side discharge port is provided on the surface of the conical cylinder, and an annular vertical plate is fixed on the inner wall of the conical cylinder, a triangular area for accommodating large-particle coating is formed between the annular vertical plate and the conical cylinder, and the large-particle coating entering the triangular area is discharged through the side discharge port.

[0024] As a preferred solution of the powder coating hopper anti-blocking device described in the present invention, the inner cavity of the conical protrusion is provided with a protective structure, which is supported by an arc-shaped support plate, and is used to seal the upper and lower ports of the conical protrusion to form a closed space for installing a drive motor between the conical protrusion and the conical protrusion.

[0025] Beneficial effects of the present invention: The present invention uses the synergistic effect of the reflective plate, the baffle plate and the triangular guide plate, and uses the spiral structure to drive the guide assembly and the screening assembly to synchronously displace to screen the powder coating, thereby achieving effective separation of fine-particle coating and large-particle coating. Among them, the oblique installation of the reflective plate utilizes the kinetic energy advantage of the large-particle coating to guide it into the powder retention area; and effectively blocks the passage of fine-particle coating through the baffle plate to improve the separation efficiency of fine-particle coating and large-particle coating; the inclined design of the triangular guide plate ensures that the large-particle coating can slide smoothly to the coarse material outlet, ensuring the accuracy and reliability of the screening results. At the same time, the screening assembly is arranged below the emptying bucket to avoid the flying of fine-particle coating and the undesirable phenomenon of dust diffusion caused by the dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of a powder coating hopper anti-blocking device;

[0028] Figure 2 It is a schematic diagram of the internal structure of the main hopper in the present invention;

[0029] Figure 3 It is a schematic diagram of the internal structure of the emptying bucket in the present invention;

[0030] Figure 4 It is a schematic diagram of the bottom structure of the emptying bucket in the present invention;

[0031] Figure 5 It is a schematic diagram of the overall structure of the spiral structure in the present invention;

[0032] Figure 6 It is a schematic diagram of the overall structure of the protective structure in the present invention;

[0033] Figure 7 It is a schematic diagram of the overall structure of the screening structure in the present invention;

[0034] Figure 8 It is a structural detail diagram of the gear set in the present invention;

[0035] Fig. 9 The structural details of the protective structure in the present invention Figure 1 ;

[0036] Fig.10 It is a structural detail diagram of the screening plate in the present invention;

[0037] Fig.11 It is an axonometric diagram of the overall structure of the screening disc in the present invention;

[0038] Fig.12 The structural details of the protective structure in the present invention Figure 2 .

[0039] Fig.13 This is a structural detail diagram of the baffle plate in the present invention.

[0040] Figure numerals: 11, main hopper; 111, annular cylinder; 112, conical cylinder; 113, side discharge port; 114, annular vertical plate; 12, main discharge port; 21, emptying bucket; 22, guide port; 23, conical protrusion; 231, arc-shaped support plate; 24, arc-shaped passage; 25, triangular support plate; 26, guide plate; 31, spiral shaft; 32, spiral blade; 33, scraper; 34, gear set; 341, half-tooth gear; 342, ring gear; 41, drive motor; 42, extension rod; 4 3. Action gear; 51. Linear guide rail; 52. Guide rail slider; 61. Screening disc; 611. Screen; 612. Frame plate; 613. Rectangular groove; 62. Rectangular rack; 63. Coarse material outlet; 64. Fine material outlet; 65. Reflection plate; 66. Blocking plate; 67. Triangular guide plate; 68. External plate; 69. Blocking plate; 71. Upper cover; 72. Lower cover; 721. Center plate; 722. Side plate; 723. Arc groove; 73. Combination rod; 731. Upper rod; 732. Lower rod. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0042] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0044] Example 1

[0045] Reference Figure 1-Figure 13 FIG. 1 is a first embodiment of the present invention, which is a device for preventing a powder coating hopper from blocking, comprising:

[0046] A main hopper 11, an emptying hopper 21 is provided at the upper part of the inner cavity of the main hopper 11, a main discharge port 12 is provided at the lower end, a plurality of guide ports 22 for batch discharge are provided at the bottom end of the emptying hopper 21, and a conical protrusion 23 extends upward from the center of the emptying hopper 21, an arcuate passage 24 for accommodating large particles of paint is formed between the inner wall of the emptying hopper 21 and the conical protrusion 23, a plurality of guide ports 22 are arranged in the arcuate passage 24, and a screening chamber is formed between the emptying hopper 21 and the main hopper 11.

[0047] like Figure 1 and Figure 2 As shown, the emptying bucket 21 is a conical cylinder with a larger top and a smaller bottom and an inner wall that smoothly transitions from top to bottom. An arc-shaped passage 24 for accommodating large particles of paint is formed between the arc-shaped inner wall of the emptying bucket 21 and the conical protrusion 23. The guide port 22 is located on this arc-shaped passage 24. The powder paint entering the emptying bucket 21 is guided to the arc-shaped passage 24 via the arc-shaped inner wall of the emptying bucket 21 and the conical protrusion 23. The powder particle paint then enters the sub-screening chamber in batches through multiple guide ports 22 and is discharged.

[0048] The main hopper 11 includes an annular cylinder 111 and a conical cylinder 112 connected by flanges. The main discharge port 12 is the lower port of the conical cylinder 112, and the upper port of the annular cylinder 111 is the feed port. The emptying bucket 21 and the annular cylinder 111 are fixedly connected. The powder coating entering the main hopper 11 through the feed port enters the guide port 22 through the emptying bucket 21 and then falls into the screening cavity.

[0049] like Figure 4 As shown, a plurality of triangular support plates 25 are fixed to the edge of the emptying bucket 21 , and the main hopper 11 supports the emptying bucket 21 through the plurality of triangular support plates 25 .

[0050] like Figure 3 and Figure 4 As shown, a plurality of circular holes are vertically penetrated at equal intervals on the surface of the emptying bucket 21, and a guide plate 26 is enclosed at each circular hole. The enclosed guide plate 26 forms a conical cylinder with a larger upper part and a smaller lower part. The lower end of the conical cylinder is a guide port 22. The powder coating in the emptying bucket 21 is collected through the guide plate 26 and discharged from the guide port 22. There are multiple guide ports 22. The powder coating entering the emptying bucket 21 is divided into batches by the guide ports 22, and the batches of powder coating enter the sieving cavity through different guide ports 22.

[0051] The spiral structure is inserted into the sub-screen cavity from the guide port 22 of the emptying bucket 21, and stirs the powder coating to destroy the agglomerated structure of the powder coating by rotation, so as to drive the powder coating to be discharged.

[0052] Specifically, powder coatings often have problems with poor feeding during use, especially local accumulation or bridging in the hopper, resulting in uneven powder flow. In order to solve this problem, a spiral structure is added inside the emptying hopper 21 to improve the feeding of powder coatings.

[0053] Reference Figure 5As shown, the spiral structure includes a spiral shaft 31 and a spiral blade 32. The spiral shaft 31 extends along the guide port 22 in the emptying bucket 21 to the lower part of the emptying bucket 21. The spiral blade 32 is spirally arranged on the upper part of the spiral shaft 31. The spiral blade 32 is driven by the spiral shaft 31 to rotate to act on the powder coating to loosen the powder coating.

[0054] The spiral structure further includes a gear set 34 disposed at the bottom of the spiral shaft 31 . The gear set 34 includes a half-tooth gear 341 and a ring gear 342 .

[0055] Specifically, when the spiral shaft 31 rotates, the spiral blades 32 break the agglomeration of the powder coatings through stirring, so that the powder coatings remain in a loose state. The loose powder coatings fall to the guide port 22 under the action of gravity and enter the sub-screening cavity. This stirring action helps prevent the fine particles in the powder coatings from being "entrained" by the large particles to form local accumulation, and also improves the fluidization state of the powder, so that it flows more evenly into the sub-screening cavity. Through the continuous stirring of the spiral blades 32, the spiral blades 32 effectively prevent the fine particles from being "entrained" by the large particles to form local accumulation, reducing the risk of blockage.

[0056] The spiral structure also includes a scraper 33 arranged in the middle of the spiral shaft 31. The scraper 33 is close to the guide plate 26 and is driven to rotate by the spiral shaft 31. The rotating scraper 33 scrapes off the residual powder on the guide plate 26 to prevent the powder from accumulating on the guide plate 26, thereby ensuring smooth discharge of powder coating.

[0057] A driving structure is disposed in the conical protrusion 23 , and the driving structure includes a driving unit and an acting unit. The acting unit is meshed with the ring gear 342 , and the driving unit drives the acting unit to act on the ring gear 342 to drive the ring gear 342 to rotate.

[0058] like Figure 7 As shown, the driving unit includes a driving motor 41 and an extension rod 42 connected to the end of the output shaft of the driving motor 41. The acting unit is configured as an acting gear 43 located at the bottom end of the extension rod 42 and coaxially arranged. The driving motor 41 drives the acting gear 43 to rotate through the extension rod 42 to engage with the ring gear 342 for transmission.

[0059] like Figure 2 As shown, there are three groups of screening structures, which are respectively located directly below the diversion port 22 of the emptying bucket 21. A linear guide rail 51 for supporting the screening disc 61 is fixed to the inner wall of the annular cylinder 111, and a guide rail slider 52 is fixed to the surface of the screening disc 61. The guide rail slider 52 is engaged with the linear guide rail 51, and the screening disc 61 is driven by an external force to run along the track surface of the linear guide rail 51 through the guide rail slider 52.

[0060] The screening structure includes a screening component and a guide component. The screening component includes a screening disc 61 and a rectangular rack 62. The screening disc 61 is provided with a coarse material outlet 63 on the side facing the main hopper 11. The rectangular rack 62 is fixed to the bottom of the screening disc 61 and meshes with the half-tooth gear 341. The half-tooth gear 341 intermittently meshes with the two rows of racks of the rectangular rack 62 during rotation, thereby driving the screening disc 61 to reciprocate linearly, and large particles of paint are discharged from the coarse material outlet 63.

[0061] The screening disc 61 is composed of a screen 611 at the bottom and a frame plate 612 enclosed on the side of the screen 611. The holes formed on the surface of the screen 611 are the fine material outlet 64. The reciprocating linearly moving screening disc 61 screens the powder coating. The screened fine particle coating passes through the fine material outlet 64, and the screened large particle coating is retained on the screening disc 61. The reciprocating linearly moving screening disc 61 acts on the large particle coating through friction, so that the large particle coating has a certain speed, and the moving large particle coating is discharged through the coarse material outlet 63.

[0062] like Fig.10 , Fig.11 as well as Fig.13 As shown, the guide assembly includes a reflector 65, a baffle plate 66 and a triangular guide plate 67. The triangular guide plate 67 is located at one end of the screen 611 close to the coarse material outlet 63, and the upper edge of the triangular guide plate 67 is connected to the coarse material outlet 63. The inclined surface of the triangular guide plate 67 forms a platform for guiding the large particles of paint to roll, so as to guide the large particles of paint to enter the coarse material outlet 63 and ensure that the large particles of paint can be discharged smoothly. The baffle plate 66 is connected to the bottom of the triangular guide plate 67 and forms a powder storage The reflecting plate 65 is arranged above the blocking plate 66 and forms a certain angle with the blocking plate 66. The reflecting plate 65 is obliquely installed on the frame plate 612. The particle powder impacting the blocking plate 66 is reflected onto the reflecting plate 65. The large particle paint falling into the screening component through the guide port 22 is accelerated and impacts the blocking plate 66. The large particle paint is guided by the blocking plate 66 and projected and reflected by the reflecting plate 65, jumping into the powder retention area for screening. The large particle paint located in the powder retention area is discharged through the coarse material outlet 63.

[0063] Specifically, the triangular guide plate 67 is located at one end of the screen 611 close to the coarse material outlet 63, and the upper edge of the triangular guide plate 67 is connected to the coarse material outlet 63. The inclined surface of the triangular guide plate 67 forms a platform for guiding the large-particle paint to roll, so as to guide the large-particle paint to smoothly enter the coarse material outlet 63, ensuring that the large-particle paint can be discharged smoothly.

[0064] The blocking plate 66 is connected to the bottom of the triangular guide plate 67 and forms a powder storage area with the triangular guide plate 67. The area is used to temporarily store large particles of paint, separate large particles of paint and fine particles of paint, and improve screening efficiency.

[0065] The reflective plate 65 is installed obliquely on the frame plate 612 . When the particle powder impacting the baffle plate 66 is reflected onto the reflective plate 65 , it will jump into the powder storage area under the action of the reflective plate 65 .

[0066] Specifically, the powder storage area is used to receive the large-particle paint guided by the baffle plate 66 and the reflector plate 65. Among them, the large-particle paint has a strong attraction to each other and a weak mobility, and the mobility of the large-particle paint is stronger than that of the fine-particle paint. Therefore, the large-particle paint will rush onto the baffle plate 66, and form an arc-shaped drooping path under the action of the baffle plate 66 and gravity. The drooping large-particle paint falls on the reflector plate 65, impacting the reflector plate 65 to produce a rebound effect, and the large-particle paint jumps over the baffle plate 66 and enters the powder storage area. As the screening disc 61 continues to perform reciprocating linear displacement, this movement drives the large-particle paint to continuously impact the inclined surface of the triangular guide plate 67, and finally discharged from the discharge port.

[0067] Through the cooperation of the reflector 65, the baffle plate 66 and the triangular guide plate 67, not only the separation efficiency of large-particle coating is improved, but also the mis-discharge of fine-particle coating is effectively reduced, thereby ensuring the accuracy and reliability of the screening process. The synergistic effect of the reflector 65, the baffle plate 66 and the triangular guide plate 67 enables the powder coating to be fully separated before entering the coarse material outlet 63, thereby avoiding the mixing of fine-particle coating. This design not only improves the screening efficiency, but also ensures the accuracy and reliability of the screening results, and is suitable for various occasions where efficient separation of powders of different particle sizes is required.

[0068] Through the synergistic effect of the reflector 65, the baffle plate 66 and the triangular guide plate 67, the fine particles of paint and the large particles of paint are effectively separated. The reflector 65 is installed obliquely to guide the large particles of paint into the powder storage area by taking advantage of their kinetic energy; the baffle plate 66 is designed to effectively block the passage of fine particles of paint; the triangular guide plate 67 is designed with an inclined surface to ensure that the large particles of paint can slide smoothly to the coarse material outlet 63. This multi-layer guide design not only improves the screening efficiency, but also ensures the accuracy and reliability of the screening results, and is suitable for various occasions where powders of different particle sizes need to be efficiently separated.

[0069] A rectangular groove 613 is also provided on the screen 611 of the screening disc 61. The rectangular groove 613 forms a passage for the extension rod 42 to move, and a sealing plate 69 is blocked on the upper surface of the rectangular groove 613. The sealing plate 69 is fixed on the extension rod 42 and passes through the reflection plate 65, the blocking plate 66, the triangular guide plate 67 and the screening disc 61.

[0070] The blocking plate 69 is an elastic and retractable plate, and intermittently abuts against the inner wall of the main hopper 11 and the surface of the extension rod 42 as the extension rod 42 moves.

[0071] The blocking plate 69 is used to block the rectangular groove 613 to prevent the unscreened powder from directly leaking out of the rectangular groove 613 .

[0072] An external plate 68 for adjusting the movement trajectory of large-particle paint is fixed to the outer wall of the screening disc 61 located at the coarse material outlet 63 . The large-particle paint passing through the coarse material outlet 63 is supported by the external plate 68 and its trajectory is changed.

[0073] like Figure 2 As shown, a side discharge port 113 is provided on the surface of the conical cylinder 112, and an annular vertical plate 114 is fixed to the inner wall of the conical cylinder 112. A triangular area for accommodating large particle paint is formed between the annular vertical plate 114 and the conical cylinder 112, and the large particle paint entering the triangular area is discharged through the side discharge port 113.

[0074] Specifically, during the linear reciprocating displacement of the screening disc 61, when the screening disc 61 moves toward the coarse material outlet 63, the large particles of paint will be pushed forward by the blocking plate 66, causing the large particles of paint to generate acceleration. At this time, the screening disc 61 moves away from the coarse material outlet 63, but the large particles of paint still rush onto the triangular guide plate 67 at a certain speed. Under the guidance of the inclined surface of the triangular guide plate 67, the large particles of paint slide toward the coarse material outlet 63. When the large particles of paint rush out of the coarse material outlet 63, they have a certain initial velocity. Due to the initial velocity and gravity, the large particles of paint will move along a parabolic trajectory after rushing out of the coarse material outlet 63.

[0075] In order to change this parabolic trajectory and ensure that the large particles of paint can enter the triangular area, an external plate 68 is fixed to the outer wall of the coarse material outlet 63, which is located below or on the side of the coarse material outlet 63 and is arranged in an inclined surface to provide an upward supporting force for the large particles of paint to change the movement trajectory of the large particles of paint, so as to ensure that the large particles of paint can be discharged along the predetermined trajectory.

[0076] Example 2

[0077] Reference Figure 4 and Fig.12 The second embodiment of the present invention is shown in FIG. 1 , which is based on the previous embodiment, except that the conical protrusion 23 is a hollow structure, which is connected to the sub-screening chamber and the upper chamber of the emptying bucket 21 , and a plurality of arc-shaped support plates 231 are fixed at equal intervals on the inner wall of the conical protrusion 23 .

[0078] The inner cavity of the conical protrusion 23 is provided with a protection structure, and the protection structure is supported by the arc-shaped support plate 231 .

[0079] The protective structure includes an upper cover 71 and a lower cover 72, and a plurality of combination rods 73 are arranged between the upper cover 71 and the lower cover 72. The upper cover 71 and the lower cover 72 are connected as a whole through the combination rods 73. The combination rods 73 are an upper rod 731 and a lower rod 732 that are engaged with each other. The upper rod 731 and the lower rod 732 are flange-connected. The upper rod 731 is connected to the upper cover 71, and the lower rod 732 is connected to the lower cover 72. The lower cover 72 stretches the upper cover 71 through the combination rods 73, so that the upper cover 71 is tightly connected to the upper surface of the conical protrusion 23.

[0080] Among them, the lower cover 72 includes a central plate body 721 and multiple side plates 722. Two adjacent side plates 722 are fitted together, and the side plates 722 are hinged to the outer surface of the central plate body 721. The hinged connection design allows the lower cover 72 to be deformed to enter the inner cavity of the conical protrusion 23, so that the lower cover 72 enters the inner cavity of the conical protrusion 23.

[0081] The side plate 722 is also provided with a plurality of arc grooves 723 for embedding the plurality of arc support plates 231 . The drive motor 41 is mounted on the center plate 721 , and the output end of the drive motor 41 passes through the center plate 721 and is connected to the extension rod 42 .

[0082] Among them, the upper cover 71, the lower cover 72 and the inner wall of the conical protrusion 23 form a sealed space, which is used to install the drive motor 41 to prevent large particles of paint from entering the drive motor 41 and causing the drive motor 41 to malfunction and affect the shutdown of the drive motor 41.

[0083] Of course, the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and equal changes and improvements made by ordinary technicians in the technical field within the essential scope of the present invention should all fall within the scope of the patent coverage of the present invention.

[0084] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0085] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0086] Finally: The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A powder coating hopper anti-blocking device, characterized in that: include: An emptying bucket (21), wherein the bottom end of the emptying bucket (21) is provided with a plurality of guide ports (22) for discharging materials in batches; A spiral structure is inserted into the guide port (22) of the emptying bucket (21) and rotates to stir the powder coating to break the agglomerated structure of the powder coating, so as to drive the powder coating to fall into the guide port (22) under gravity and be emptied; A driving structure, the driving structure comprising a driving unit and an acting unit, the driving unit driving the spiral structure to rotate through the acting unit; A screening structure comprises a screening component and a guide component, wherein the spiral structure acts on the screening component to drive the guide component and the screening component to move synchronously to screen the powder coating, wherein the guide component comprises a reflecting plate (65), a blocking plate (66) and a triangular guiding plate (67), wherein the blocking plate (66) is connected to the bottom of the triangular guiding plate (67) and forms a powder storage area with the triangular guiding plate (67), wherein the reflecting plate (65) is arranged above the blocking plate (66) and forms a certain angle with the blocking plate (66), wherein large particles of coating falling into the screening component through the guide port (22) are accelerated and impact the blocking plate (66), wherein the large particles of coating are guided and ejected by the blocking plate (66) and reflected by the reflecting plate (65), and then jump into the powder storage area for screening.

2. The anti-blocking device for a powder coating hopper according to claim 1, characterized in that: The screening assembly comprises a screening disc (61) and a rectangular rack (62), wherein the rectangular rack (62) is fixed to the bottom of the screening disc (61) and meshes with a spiral structure, wherein the spiral structure drives the screening disc (61) to perform reciprocating linear motion via the rectangular rack (62), and the screening disc (61) in reciprocating linear motion acts on large-particle coating to generate speed; The screening plate (61) is composed of a screen (611) at the bottom and a frame plate (612) enclosed on the side of the screen (611); the holes formed on the surface of the screen (611) are fine material outlets (64); a coarse material outlet (63) is provided on the side of the screening plate (61) facing the main hopper (11); and the large particles of paint generated at a high speed are discharged through the coarse material outlet (63).

3. The anti-blocking device for a powder coating hopper according to claim 2, characterized in that: A coaxial main hopper (11) is fixed to the outer wall of the emptying hopper (21), wherein the main hopper (11) comprises an annular cylinder (111) and a conical cylinder (112) connected in a flange manner, wherein the upper end of the annular cylinder (111) is set as a feed port, and the lower end of the conical cylinder (112) is set as a main discharge port (12); A conical protrusion (23) extends upward from the center of the emptying bucket (21), and an arc passage (24) for accommodating large particles of paint is formed between the inner wall of the emptying bucket (21) and the conical protrusion (23). The surface of the arc passage (24) is vertically penetrated by a plurality of circular holes at equal intervals, and a guide plate (26) is enclosed at each of the circular holes, and the lower end of the guide plate (26) is formed as a guide port (22).

4. The anti-blocking device for a powder coating hopper according to claim 3, characterized in that: The spiral structure comprises a spiral shaft (31) and spiral blades (32), wherein the spiral shaft (31) extends along the guide port (22) in the emptying bucket (21) to the lower part of the emptying bucket (21), and the spiral blades (32) are arranged in a spiral shape on the upper part of the spiral shaft (31), and the spiral blades (32) are driven by the spiral shaft (31) to rotate to act on large particles of paint to loosen the large particles of paint; The spiral structure also includes a scraper (33) arranged in the middle of the spiral shaft (31); the scraper (33) is in close contact with the guide plate (26) and is driven to rotate by the spiral shaft (31); the rotating scraper (33) scrapes off residual powder on the guide plate (26).

5. The anti-blocking device for a powder coating hopper according to claim 4, characterized in that: The spiral structure further comprises a gear set (34) arranged at the bottom of the spiral shaft (31), wherein the gear set (34) comprises a half-tooth gear (341) and a ring gear (342); The driving unit comprises a driving motor (41) and an extension rod (42) connected to the end of the output shaft of the driving motor (41); the acting unit is configured as an acting gear (43) located at the bottom end of the extension rod (42) and coaxially arranged; the driving motor (41) drives the acting gear (43) to rotate through the extension rod (42) so as to mesh with the ring gear (342) for transmission.

6. The anti-blocking device for a powder coating hopper according to claim 5, characterized in that: The annular gear (342) acts on the half-toothed gear (341) through the screw shaft (31), so that the half-toothed gear (341) intermittently meshes with the two rows of rectangular racks (62) to drive the screening disc (61) to reciprocate linearly.

7. The anti-blocking device for a powder coating hopper according to claim 6, characterized in that: An external plate (68) for adjusting the movement trajectory of large-particle paint is fixed to the outer wall of the screening disc (61) located at the coarse material outlet (63). The large-particle paint passing through the coarse material outlet (63) is supported by the external plate (68) and the projection trajectory is changed.

8. The anti-blocking device for a powder coating hopper according to claim 7, characterized in that: A linear guide rail (51) for supporting a screening disc (61) is fixed to the inner wall of the annular cylinder (111), and a guide rail slider (52) is fixed to the surface of the screening disc (61). The guide rail slider (52) is engaged with the linear guide rail (51), and the screening disc (61) is driven by an external force to run along the track surface of the linear guide rail (51) through the guide rail slider (52).

9. The anti-blocking device for a powder coating hopper according to claim 8, characterized in that: A side discharge port (113) is provided on the surface of the conical cylinder (112), and an annular vertical plate (114) is fixed to the inner wall of the conical cylinder (112). A triangular area for accommodating large-particle paint is formed between the annular vertical plate (114) and the conical cylinder (112), and the large-particle paint entering the triangular area is discharged through the side discharge port (113).

10. The anti-blocking device for a powder coating hopper according to claim 9, characterized in that: The inner cavity of the conical protrusion (23) is provided with a protective structure, which is supported by an arc-shaped support plate (231). The protective structure is used to seal the upper and lower ports of the conical protrusion (23) to form a closed space between the conical protrusion (23) and the conical protrusion (23) for installing a drive motor (41).

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