A corundum powder brushing device for molding

By combining a motor-driven premixing rod and stirring rod, a driven rotating mechanism, and a weighing sensor, the problem of low automation in the coating device is solved, achieving continuous and uniform coating, and improving processing efficiency and quality.

CN117101943BActive Publication Date: 2025-11-07WUXI SPINEL MAGNETICS
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Patent Information

Application Number
CN202311097305.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-28
Publication Date
2025-11-07
Estimated Expiration
2043-08-28

AI Technical Summary

Technical Problem

The existing coating equipment has a low degree of automation, which leads to problems such as uneven coating and uneven powder application.

Method used

The system employs a motor-driven premixing rod and stirring rod, along with a driven rotating mechanism, a weighing sensor, and an auxiliary brushing mechanism, to achieve continuous mixing and quantitative brushing of powder. The brushing quality is detected by a detection element, and additional brushing is performed to ensure uniform brushing.

Benefits of technology

It achieves continuous and uniform coating, improves processing efficiency and coating quality, and avoids problems such as uneven coating and powder waste caused by human control.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a corundum powder brushing equipment for forming, which comprises a material box and a pretreatment seat, a rack is connected to the outer side wall of the material box, a premixing rod is arranged in the rack, the bottom of the premixing rod is connected with a stirring rod, the top of the premixing rod is connected with the output end of a motor, the bottom of the stirring rod is connected with a driven rotating mechanism, the stirring rod is connected with a driven rod through a bevel gear transmission structure, the driven rod is connected with a sponge roller through a belt transmission structure, and an auxiliary supplementary brushing mechanism is arranged on one side of the sponge roller. The corundum powder brushing equipment for forming is characterized in that the sponge roller rotates along with the rotation of the premixing rod and the stirring rod under the cooperation of the bevel gear transmission structure and the belt transmission structure, so that the rotating sponge roller can continuously brush the blanks, and the uniform rotation of the sponge roller can ensure the consistent contact time of the sponge roller and the blanks, thereby avoiding the uneven brushing phenomenon.
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Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of equipment, in particular to a corundum powder brushing equipment for molding. BACKGROUND

[0002] Manganese zinc ferrite is a kind of soft magnetic ferrite, belongs to spinel structure, is made of iron, manganese, zinc oxide and its salt, is made by ceramic process, it has high initial permeability, can be used as inductor, transformer, filter core, magnetic head and antenna rod, in the processing of manganese zinc ferrite, a layer of corundum powder needs to be brushed on the surface of the body after being pressed into shape, so the brushing equipment needs to be used, through the search, it is found that the brushing device in the prior art is typical, such as the publication number CN201969672U a kind of ferrite core blanking device, including bottom plate, the bottom surface of bottom plate is fixedly connected with smearing piece, smearing piece adopts sponge, the top surface of bottom plate is fixedly connected with handle, the size of bottom plate is 170x170x150mm, bottom plate is wooden, can evenly smears zirconia powder, only needs to press gently, can evenly smears zirconia powder on the contact surface of ferrite blank, and zirconia powder will not fall into product groove, the size of a standard bearing plate is 330x330mm, as long as pressing four times, can all smears to all blank, improves work efficiency and work quality, its main characteristics are simple structure, low cost and strong practicability.

[0003] In summary, the existing brushing device is mostly low in automation degree, that is, the brushing amount needs to be controlled artificially, so that uneven brushing and uneven powder coating are prone to occur, in view of the above problems, the existing equipment needs to be improved. SUMMARY

[0004] The purpose of the present application is to provide a corundum powder brushing equipment for molding, to solve the problem that the existing brushing device is mostly low in automation degree, that is, the brushing amount needs to be controlled artificially, so that uneven brushing and uneven powder coating are prone to occur.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a corundum powder brushing equipment for molding, comprising a material box and a pretreatment seat,

[0006] The outer wall of the material box is connected with a rack, and the inner part of the rack is provided with a premixing rod, the bottom of the premixing rod is connected with a stirring rod, and the top of the premixing rod is connected with the output end of a motor, the bottom of the stirring rod is connected with a driven rotating mechanism, and the driven rotating mechanism comprises a bevel gear transmission structure, a driven rod, a belt transmission structure and a sponge roller, the stirring rod is connected with the driven rod through the bevel gear transmission structure, the driven rod is connected with the sponge roller through the belt transmission structure, one side of the sponge roller is provided with an auxiliary replenishing mechanism, the sponge roller is connected with the bottom of the material box through a support frame, and the sponge roller is arranged below the liquid discharge pipe, and a second electric valve and a flowmeter are arranged on the liquid discharge pipe.

[0007] The pretreatment seat is arranged on the top of the material box, the inner part of the pretreatment seat is symmetrically provided with support seats, the support seats are connected through transmission shafts, the support seats are connected with hoppers through weighing sensors, the hoppers are arranged below the top cover, the top cover is clamped and connected on the top of the pretreatment seat, gears are connected on the transmission shafts, and racks are arranged above the gears, one end of the rack is connected with a hydraulic cylinder, the other end of the hydraulic cylinder is connected with the inner wall of an equipment seat, and the equipment seat is fixedly connected on the inner wall of the pretreatment seat.

[0008] Preferably, the inner part of the material box is fixedly connected with a partition plate, and the partition plate is provided with a first electric valve.

[0009] Preferably, the outer wall of the material box is provided with a control panel and a buzzer, and the buzzer, the hydraulic cylinder and the weighing sensor are electrically connected.

[0010] Preferably, the partition plate is arranged at the connection part of the premixing rod and the stirring rod, and the premixing rod and the stirring rod are both connected with mixing racks.

[0011] Preferably, the sponge roller is rotatably connected on the support frame, and the support frame and the sponge roller form a detachable structure.

[0012] Preferably, a detection element is arranged between the sponge roller and the auxiliary replenishing mechanism, and the detection element is arranged on the bottom of the material box.

[0013] Preferably, the auxiliary replenishing mechanism comprises a replenishing pipe, a baffle, a flow distribution cover, replenishing rollers, a bracket and an electric telescopic rod, the replenishing pipe is connected through the bottom of the material box, the bottom end of the bottom of the material box is in contact with the baffle, the baffle is arranged in the flow distribution cover, and the flow distribution cover is connected with the replenishing rollers.

[0014] Preferably, the flow distribution cover is connected with the bracket, and the bracket is connected with the bottom of the material box through the electric telescopic rod.

[0015] Preferably, the replenishing rollers are equidistantly distributed on the flow distribution cover, and the replenishing rollers are rotatably connected with the flow distribution cover.

[0016] Preferably, the gear is engaged with the rack, and the rack is slidingly connected in the interior of the device base.

[0017] Compared with the prior art, the application has the beneficial effects that the forming corundum powder brushing device,

[0018] (1) The application can effectively solve the problem of poor continuity and low efficiency of the existing brushing device after the powder is used up, which needs to pause the device for mixing, by the cooperation of the motor, the premixing rod, the stirring rod, the partition plate and the first electric valve. The motor drives the premixing rod and the stirring rod to rotate at the same time. The rotating stirring rod drives the mixing frame to stir the powder below the partition plate after mixing for brushing work, so as to avoid the stratification phenomenon caused by long-term static discharge, thereby facilitating to ensure the subsequent brushing quality. At the same time, the premixing rod drives the mixing frame to stir the water and corundum powder above the partition plate in the rotating process, so that they are fully mixed. When the powder below the partition plate is used up and needs to be supplemented, the worker can open the first electric valve to discharge the mixed powder above the partition plate to the lower part of the partition plate, so that the device can continuously supply the material. Compared with the existing brushing device, the application can prevent the stratification of the stirred material while premixing the raw materials, thereby ensuring that the device can continuously supply the material for the brushing process, and thereby ensuring the processing efficiency of the device.

[0019] (2)The application can effectively solve the problem of low automation degree of the existing brushing device, that is, the brushing amount needs to be controlled manually, thereby easily causing uneven brushing and uneven powder coating. The sponge roller in the driven rotating mechanism rotates under the cooperation of the bevel gear transmission structure and the belt transmission structure, thereby continuously brushing the blanks by using the rotating sponge roller. Meanwhile, the uniform rotation of the sponge roller can ensure the consistent contact time of the sponge roller with each blank, thereby avoiding uneven brushing. On the other hand, the flowmeter can adjust and control the powder discharged from the second electric valve, thereby achieving the purpose of adding powder to the sponge roller in a quantitative manner, avoiding the problem of powder dripping caused by excessive powder addition, and avoiding the problem of uneven coating caused by insufficient powder addition. Meanwhile, the detection element detects the quality after brushing. When the brushing quality is detected to be unqualified, the detection element transmits the information to the controller. The controller controls the electric telescopic rod in the auxiliary brushing mechanism to push the brush roller at the bottom of the shunt cover to move downward and contact the blank to perform secondary brushing on the blank conveyed on the conveyor. Meanwhile, the shunt cover drives the baffle to move downward synchronously away from the bottom end of the liquid supplement pipe, thereby enabling the powder in the liquid supplement pipe to be discharged into the shunt cover and then be distributed to different positions of the brush roller through the through hole at the bottom of the shunt cover for liquid addition. After the brushing is completed, the electric telescopic rod is retracted to drive the brush roller and the baffle to reset and block the continuous liquid addition of the liquid supplement pipe, thereby ensuring the normal operation of the brushing work. Compared with the existing brushing device, the present application has two brushing procedures. The first brushing procedure ensures the uniformity of brushing by uniform brushing time and quantitative feeding structure. When the brushing quality in the first brushing procedure is unqualified, the second brushing procedure is started to brush the blank, thereby further ensuring the uniformity of brushing.

[0020] (3)The cooperation of the weighing sensor, the hopper, the transmission shaft, the gear, the rack and the hydraulic cylinder can effectively solve the problem that the existing brushing equipment needs to control the feeding amount of raw materials to ensure the brushing quality, and the subjective feeding amount affects the subsequent brushing quality. The weighing sensor weighs the water and corundum powder, i.e., the raw materials, fed into the hopper respectively. When the weighing sensor detects that the weight in the corresponding hopper reaches the set value, the buzzer will sound to remind the worker to stop feeding. When the water and corundum powder in the hopper reach the set value, the weighing sensor will control the hydraulic cylinder to move the rack under the cooperation of the controller. The rack moves to drive the gear to drive the transmission shaft and the hopper to rotate to pour the water and raw materials into the inside of the material box, thereby mixing the raw materials by using the premixing rod. Compared with the existing manual feeding method, the feeding amount is more accurate, thereby ensuring the quality of the powder and liquid, and being more convenient and fast. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the main view structure schematic diagram of the application;

[0022] Figure 2 It is the main view structure schematic diagram of the application;

[0023] Figure 3 It is the main view structure schematic diagram of the application;

[0024] Figure 4 It is the main view structure schematic diagram of the application; Figure 1 It is the main view structure schematic diagram of the application;

[0025] Figure 5 It is the main view structure schematic diagram of the application; Figure 1 It is the main view structure schematic diagram of the application;

[0026] Figure 6 It is the main view structure schematic diagram of the application; Figure 2 It is the main view structure schematic diagram of the application.

[0027] In the figure: 1, material box; 2, rack; 3, partition plate; 4, first electric valve; 5, premixing rod; 6, stirring rod; 7, mixing frame; 8, driven rotating mechanism; 801, bevel gear transmission structure; 802, driven rod; 803, belt transmission structure; 804, sponge roller; 9, support frame; 10, second electric valve; 11, flowmeter; 12, detection element; 13, auxiliary replenishing mechanism; 1301, replenishing pipe; 1302, baffle; 1303, shunt cover; 1304, replenishing roller; 1305, bracket; 1306, electric telescopic rod; 14, motor; 15, pretreatment seat; 16, top cover; 17, support seat; 18, weighing sensor; 19, hopper; 20, transmission shaft; 21, gear; 22, rack; 23, hydraulic cylinder; 24, control panel; 25, equipment seat; 26, buzzer. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0029] Please refer to Figures 1-6 The application provides a technical solution: a corundum powder brushing device for molding, embodiment one

[0030] As Figure 1As shown, the outer side wall of the material box 1 is connected with the rack 2, and the inside of the rack 2 is provided with a premixing rod 5, the bottom of the premixing rod 5 is connected with a stirring rod 6, and the top of the premixing rod 5 is connected with the output end of a motor 14.

[0031] In a further embodiment, the inside of the material box 1 is fixedly connected with a partition plate 3, and the first electric valve 4 is installed on the partition plate 3.

[0032] In a further embodiment, the partition plate 3 is arranged at the connection position of the premixing rod 5 and the stirring rod 6, and the mixing frame 7 is connected to the premixing rod 5 and the stirring rod 6.

[0033] Specifically, the premixing rod 5 and the stirring rod 6 can be operated differently on the two sides of the partition plate 3, thereby optimizing the structure of the device.

[0034] As shown in Figure 1 , Figure 2 and Figure 6 , the bottom of the stirring rod 6 is connected with a driven rotating mechanism 8, and the driven rotating mechanism 8 includes a bevel gear transmission structure 801, a driven rod 802, a belt transmission structure 803, and a sponge roller 804. The stirring rod 6 is connected with the driven rod 802 through the bevel gear transmission structure 801, the driven rod 802 is connected with the sponge roller 804 through the belt transmission structure 803, and the sponge roller 804 is provided with an auxiliary brush replenishing mechanism 13 on one side. The sponge roller 804 is connected with the bottom of the material box 1 through the support frame 9, and the sponge roller 804 is arranged below the drain pipe. The second electric valve 10 and the flow meter 11 are installed on the drain pipe.

[0035] In a further embodiment, the sponge roller 804 is rotatably connected to the support frame 9, and the support frame 9 and the sponge roller 804 form a detachable structure.

[0036] Specifically, the detachable structure facilitates the disassembly, replacement, and cleaning of the sponge roller 804 by the staff.

[0037] In a further embodiment, a detection element 12 is arranged between the sponge roller 804 and the auxiliary brush replenishing mechanism 13, and the detection element 12 is installed on the bottom of the material box 1.

[0038] Specifically, the detection element 12 is based on the infrared thermal wave nondestructive testing technology, which is a prior art and thus will not be described in detail herein.

[0039] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the pre-treatment seat 15 is arranged on the top of the hopper 1, and the inside of the pre-treatment seat 15 is symmetrically provided with support seats 17, and the support seats 17 are connected by a transmission shaft 20, the support seats 17 are connected with the hopper 19 through the weighing sensor 18, and the hopper 19 is arranged below the top cover 16, and the top cover 16 is clamped and connected on the top of the pre-treatment seat 15, the transmission shaft 20 is connected with a gear 21, and the top of the gear 21 is provided with a rack 22, one end of the rack 22 is connected with a hydraulic cylinder 23, and the other end of the hydraulic cylinder 23 is connected with the inner wall of the equipment seat 25, and the equipment seat 25 is fixedly connected on the inner wall of the pre-treatment seat 15.

[0040] Specifically, the pre-treatment seat 15 is clamped and connected on the top of the hopper 1, when the pre-treatment seat 15 affects the cleaning work inside the hopper 1, the staff can use external equipment to move the pre-treatment seat 15 from the top of the hopper 1, and then the components inside the hopper 1 can be cleaned or maintained.

[0041] In further embodiments, the outer wall of the hopper 1 is provided with a control panel 24 and a buzzer 26, and the buzzer 26, the hydraulic cylinder 23 and the weighing sensor 18 are electrically connected.

[0042] Specifically, the weighing sensor 18 and the controller are used to detect the weight of the object, and the appearance detection is performed by the cooperation of the detection element 12 and the controller, and after detection, the related equipment is controlled to be opened or closed according to the detection result, which is the prior art, and the specific detection principle will not be described here.

[0043] In further embodiments, the gear 21 is engaged with the rack 22, and the rack 22 is slidingly connected in the inside of the equipment seat 25.

[0044] Specifically, in the actual working process, first, the device is installed above the conveyor used to convey the blank by using the rack 2, and the blank is moved below the sponge roller 804, and the powder liquid in the hopper 1 is discharged to the sponge roller 804 through the liquid discharge pipe, so that the sponge roller 804 can be used to brush the upper surface of the blank, and the detection element 12 detects the quality of the blank after brushing, and when the brushing quality is detected to be unqualified, the detection element 12 will transmit this information to the controller, and the controller will control the auxiliary brushing mechanism 13 to brush the blank moved below it;

[0045] In another aspect, the motor 14 drives the premixing rod 5 and the stirring rod 6 to rotate simultaneously. The rotating stirring rod 6 drives the mixing frame 7 to stir the mixed powder below the partition plate 3 to prevent stratification. Meanwhile, the rotating stirring rod 6 drives the driven rod 802 to rotate through the bevel gear transmission structure 801, and the driven rod 802 drives the sponge roller 804 to rotate through the belt transmission structure 803, so that the sponge roller 804 can be used for brushing work on different sides, thereby prolonging the service life of the sponge roller 804. Meanwhile, the staff can adjust and set the set value of the second electric valve 10 and the flow meter 11 through the operation of the control panel 24, that is, reasonably control the liquid adding amount of the sponge roller 804, so as to ensure the uniformity of the brushing of the sponge roller 804.

[0046] When the powder below the partition plate 3 is used up and needs to be replenished, the staff can open the first electric valve 4 to discharge the mixed powder above the partition plate 3 to the lower part of the partition plate 3. After the discharging is completed, the first electric valve 4 is closed, and then the hydraulic cylinder 23 drives the rack 22 to move. The rack 22 drives the gear 21, the transmission shaft 20 and the hopper 19 to rotate during the movement, so that the raw materials in the hopper 19 are poured into the inside of the material box 1, and then the premixing rod 5 is used for stirring and mixing the raw materials. Then, the hydraulic cylinder 23 drives the rack 22 to reset, and the staff can put raw materials into the hopper 19 through the through hole at the top of the top cover 16. At the same time, the weighing sensor 18 weighs the water and corundum powder, that is, the raw materials, which are put into the hopper 19. When the weighing sensor 18 detects that the weight of the corresponding hopper 19 reaches the set value, the buzzer 26 will sound to remind the staff to stop feeding the hopper 19.

[0047] Embodiment Two

[0048] This embodiment is a further description of the above-mentioned embodiments. It should be understood that this embodiment includes all the technical features described above and is further described in detail.

[0049] As shown in Figure 1 and Figure 5 In a further embodiment, the auxiliary supplementary brushing mechanism 13 includes a liquid supplement pipe 1301, a baffle 1302, a flow distribution cover 1303, a supplementary brushing roller 1304, a bracket 1305 and an electric telescopic rod 1306. The liquid supplement pipe 1301 penetrates through the bottom of the material box 1, and the bottom end of the bottom of the material box 1 is in contact with the baffle 1302. The baffle 1302 is arranged in the inside of the flow distribution cover 1303, and the bottom of the flow distribution cover 1303 is connected with the supplementary brushing roller 1304.

[0050] In a further embodiment, the flow distributor 1303 is connected to the bracket 1305, and the bracket 1305 is connected to the bottom of the hopper 1 through the electric telescopic rod 1306.

[0051] In a further embodiment, the replenishing rollers 1304 are distributed at equal intervals on the flow distributor 1303, and the replenishing rollers 1304 are rotationally connected to the flow distributor 1303.

[0052] Specifically, when replenishing is needed, the electric telescopic rod 1306 pushes the replenishing rollers 1304 at the bottom of the flow distributor 1303 to move downward to contact the blank and perform secondary replenishing. In the process of moving downward, the baffle 1302 inside the flow distributor 1303 moves downward synchronously to move away from the bottom end of the liquid supplement pipe 1301, so that the powder in the liquid supplement pipe 1301 can be discharged to the flow distributor 1303 through the bottom outlet, and then distributed to different positions of the replenishing rollers 1304 for liquid supplement. After the replenishing is completed, the electric telescopic rod 1306 is retracted to drive the replenishing rollers 1304 and the baffle 1302 to move upward, until the baffle 1302 shields the bottom end of the liquid supplement pipe 1301, so as to avoid waste of powder liquid.

[0053] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can make modifications to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features, as long as the modifications, equivalent replacements, improvements, etc. are within the spirit and principles of the present application, which shall be included in the protection scope of the present application.

Claims

1. A corundum powder brushing equipment for molding, comprising a tank (1) and a pretreatment seat (15), characterized in that: an outer side wall of the tank (1) is connected with a rack (2), an inside of the rack (2) is provided with a premixing rod (5), a bottom of the premixing rod (5) is connected with a stirring rod (6), a top of the premixing rod (5) is connected with an output end of a motor (14), a bottom of the stirring rod (6) is connected with a driven rotating mechanism (8), the driven rotating mechanism (8) comprises a bevel gear transmission structure (801), a driven rod (802), a belt transmission structure (803) and a sponge roller (804), the stirring rod (6) is connected with the driven rod (802) through the bevel gear transmission structure (801), the driven rod (802) is connected with the sponge roller (804) through the belt transmission structure (803), one side of the sponge roller (804) is provided with an auxiliary supplementary brushing mechanism (13), the sponge roller (804) is connected with the bottom of the tank (1) through a support frame (9), the sponge roller (804) is arranged below a drainage pipe, a second electric valve (10) and a flowmeter (11) are arranged on the drainage pipe; the pretreatment seat (15) is arranged on the top of the tank (1), inside of the pretreatment seat (15) is symmetrically provided with support seats (17), the support seats (17) are connected through a transmission shaft (20), the support seats (17) are connected with hoppers (19) through load cells (18), the hoppers (19) are arranged below a top cover (16), the top cover (16) is clamped and connected on the top of the pretreatment seat (15), a gear (21) is connected on the transmission shaft (20), a rack (22) is arranged above the gear (21), one end of the rack (22) is connected with a hydraulic cylinder (23), the other end of the hydraulic cylinder (23) is connected with an inner wall of an equipment seat (25), the equipment seat (25) is fixedly connected on the inner wall of the pretreatment seat (15), the auxiliary supplementary brushing mechanism (13) comprises a supplementary liquid pipe (1301), a baffle (1302), a shunt cover (1303), a supplementary brushing roller (1304), a bracket (1305) and an electric telescopic rod (1306), the supplementary liquid pipe (1301) penetrates through and is connected on the bottom of the tank (1), a bottom end of the bottom of the tank (1) is in contact with the baffle (1302), the baffle (1302) is arranged in the inside of the shunt cover (1303), the shunt cover (1303) is connected with the supplementary brushing roller (1304) on the bottom, the shunt cover (1303) is connected on the bracket (1305), the bracket (1305) is connected with the bottom of the tank (1) through the electric telescopic rod (1306), the supplementary brushing rollers (1304) are equidistantly distributed on the shunt cover (1303), and the supplementary brushing rollers (1304) are rotationally connected with the shunt cover (1303). The inside of the tank (1) is fixedly connected with a partition plate (3), and the first electric valve (4) is arranged on the partition plate (3).

2. The corundum powder brushing apparatus for molding according to claim 1, characterized by: ​ 3. The apparatus according to claim 1, wherein: The outer wall of the material box (1) is provided with a control panel (24) and a buzzer (26), and the buzzer (26), the hydraulic cylinder (23) and the weighing sensor (18) are electrically connected.

4. The apparatus according to claim 2, wherein: The partition plate (3) is arranged at the connection between the premixing rod (5) and the stirring rod (6), and the premixing rod (5) and the stirring rod (6) are both connected with the mixing frame (7).

5. The apparatus for brushing corundum powder for molding according to claim 1, wherein: The sponge roller (804) is rotatably connected to the supporting frame (9), and the supporting frame (9) and the sponge roller (804) form a detachable structure.

6. The apparatus according to claim 1, wherein: The sponge roller (804) and the auxiliary brush supplementing mechanism (13) are provided with a detection element (12), and the detection element (12) is installed at the bottom of the material box (1).

7. The apparatus according to claim 1, wherein: The gear (21) is meshingly connected with the rack (22), and the rack (22) is slidably connected in the interior of the equipment base (25).

Citation Information

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