Polishing machine tool for plastic wheels of toy car

Abstract

The invention relates to the technical field of polishing equipment, discloses a polishing machine tool for plastic wheels of toy cars, and aims to solve the problems that the polishing time is long, molten slag scratches hubs, and the polishing quality of the plastic hubs is affected. Through the arrangement of the grinding mechanism and the discharging mechanism, the basic shaping and deburring capacity is provided through a grinding wheel, grinding particles serve as free grinding materials and are continuously bitten into a contact grinding area by two wheel bodies rotating in the same direction at different speeds, the composite effect of rolling grinding, rolling polishing and micro cutting is formed, the grinding quality is greatly improved, and meanwhile, the grinding efficiency is improved. Partial sliding friction is replaced by rolling friction, the grinding heat is greatly reduced, the generation amount of plastic slag is reduced, the influence on the grinding quality of the plastic hub is reduced, in addition, the plastic slag attached to the surface of the grinding wheel is continuously scraped by the grinding particles, self-cleaning of the grinding wheel is achieved, and the common problems that the grinding wheel is prone to sticking, the surface is gelatinized and scratched during plastic grinding are solved.

Description

A grinding machine for plastic wheels of toy cars Technical Field

[0001] This application relates to the field of grinding equipment technology, and in particular to a grinding machine tool for plastic wheels of toy cars. Background Technology

[0002] Toy cars are children's toys made by scaling down the basic structure and appearance of automobiles. Some toy cars are made larger in size during the production process to make them easier for children to ride in and to drive at a slow speed. In addition, during the production process of these toy cars, grinding machines are often used to grind the plastic wheel rims to ensure that the overall flatness of the wheel does not affect the riding experience of children when the rims are combined with the outer soft rubber tires.

[0003] Some existing plastic wheel hub grinding machines work by fixing the plastic wheel hub and making the side of the wheel hub contact the grinding wheel. Then, the two rotate in the same direction at different speeds to achieve the grinding operation on the surface of the plastic wheel hub.

[0004] However, in the above process, since the plastic wheel hub is only polished by the grinding wheel, the wheel hub needs to be polished for a long time to meet the required surface precision. At the same time, the plastic debris polished off by the grinding wheel can easily adhere to the surface of the grinding wheel and form plastic slag. When the grinding wheel comes into contact with the wheel hub again, this slag will form scratches on the surface of the wheel hub, thus affecting the polishing quality of the plastic wheel hub. Summary of the Invention

[0005] This application proposes a grinding machine for plastic wheels of toy cars, which has the advantages of shortening grinding time and reducing the contact amount between molten slag and wheel hub, thereby solving the problems of long grinding time and molten slag scratching the wheel hub, which affects the grinding quality of plastic wheel hub.

[0006] To achieve the above objectives, this application adopts the following technical solution: a grinding machine for plastic wheels of toy cars, comprising: a support platform, a work box fixedly installed on the upper side of the support platform, a fixing mechanism provided inside the work box for clamping a plastic wheel hub, a grinding mechanism provided in the inner cavity of the work box, the grinding mechanism including a grinding wheel, and a feeding mechanism provided in the inner cavity of the work box above the plastic wheel hub and the grinding wheel, the feeding mechanism including: a feeding head, two wedge-shaped triangular areas existing between the plastic wheel hub and the grinding wheel, the feeding head being located above the upper wedge-shaped triangular area; a feeding pipe connected to and installed above the feeding head, the feeding head of the feeding pipe being fixedly installed on the upper side of the work box, and an external conveying device conveying abrasive particles, which are nylon particles, to the upper wedge-shaped triangular area through the feeding pipe and the feeding head.

[0007] Furthermore, chip-blocking edges are fixedly installed on both sides of the grinding wheel in the axial direction. The chip-blocking edges on both sides close the axial sides of the upper wedge-shaped triangular area. There is a gap of millimeters between the opposite sides of the two chip-blocking edges and the plastic hub.

[0008] Furthermore, a pressure plate is provided above the upper wedge-shaped triangular area. The two ends of the pressure plate have gaps in millimeters with the corresponding plastic hub and grinding wheel, respectively. Through the pressure plate, the chip-blocking edges on both sides, the plastic hub and the grinding wheel, the upper wedge-shaped triangular area is enclosed to form an abrasive space for accommodating abrasive particles. The feed tube is fixedly installed on the pressure plate.

[0009] Furthermore, the grinding particles are in a gradient ratio of large particle size: medium particle size: small particle size = 3:5:2. 5%-8% of food-grade white corundum micro powder is added to the nylon substrate, and 0.5%-1% by mass of food-grade water-soluble grinding aid is coated on the surface of the grinding particles. The lower side wall of the working box is equipped with a filter screen, and the position inside the support platform corresponding to the filter screen is an existing collection mechanism.

[0010] Furthermore, the inner cavity of the working box is provided with a weak air mechanism, which includes: an air supply pipe, which is located above the pressure plate, with the air inlet of the air supply pipe fixedly installed on the upper surface of the working box and connected to the external air supply mechanism; an air supply head, which is fixedly connected to the lower end of the air supply pipe; and an air outlet, which is opened inside the pressure plate, with the air supply head connected to the air outlet, and the air outlet is a linear micro-groove, with the air outlet tilted towards the plastic hub.

[0011] Furthermore, the inner cavity of the working box is provided with an auxiliary air intake mechanism, which includes: a guide sleeve, which is positioned above the pressure plate and fixes the pressure plate to the working box; an extrusion plate, which is slidably installed in the inner cavity of the guide sleeve, with its lower end extending out of the pressure plate and entering the upper wedge-shaped triangular area; and a lifting cylinder, which is fixedly installed in the upper side wall of the working box, with its telescopic rod extending into the inner cavity of the guide sleeve and fixedly connected to the extrusion plate.

[0012] Furthermore, the auxiliary air intake mechanism also includes: a grain groove, which is equidistantly opened on the side of the extrusion plate facing the grinding wheel. The grain groove has a long opening facing the grinding wheel and a short opening facing the upper wedge-shaped triangular area. The diameter of the grain groove is 1.2 times the diameter of the grinding particles.

[0013] Furthermore, the fixing mechanism includes: a translation cylinder, which is fixedly installed in the left side wall of the work box; a rotating platform, which is set in the inner cavity of the work box, and the telescopic rod of the translation cylinder is fixedly connected to the rotating platform; and a radial clamping plate, which is set on the side of the rotating platform facing the opening of the work box, and the output end of the power motor in the rotating platform is fixedly connected to the radial clamping plate, and the plastic wheel hub is clamped by the radial clamping plate.

[0014] Furthermore, the grinding mechanism also includes: a reduction gearbox, which is fixedly connected to the inner wall of the right side of the working box, and the grinding wheel is disposed on the side of the reduction gearbox facing the opening of the working box; and a rotary motor, which is fixedly installed on the side of the reduction gearbox facing away from the opening of the working box, and the rotary motor drives the grinding wheel to rotate through the reduction gearbox.

[0015] This application has the following beneficial effects: The grinding machine tool for plastic wheels of toy cars provided by this application, through the setting of the grinding mechanism and the feeding mechanism, provides basic shaping and deburring capabilities through the grinding wheel, and uses abrasive particles as free abrasives, which are continuously bitten into the contact grinding zone by two wheels rotating in the same direction at different speeds, forming a composite effect of rolling grinding + rolling polishing + micro-cutting, which greatly improves the grinding quality. At the same time, rolling friction replaces part of the sliding friction, which greatly reduces grinding heat, reduces the amount of plastic slag generated, and reduces the impact on the grinding quality of plastic wheel hubs. In addition, the abrasive particles continuously scrape off the plastic slag attached to the surface of the grinding wheel, realizing the self-cleaning of the grinding wheel and solving the common problems of easy sticking, surface pasting, and scratches when grinding plastic.

[0016] By setting up the feeding mechanism and chip-blocking edges, the chip-blocking edges on both sides of the grinding wheel form an axial limit, locking the grinding particles in the wedge-shaped grinding area, reducing splash loss, and allowing only the worn waste particles and plastic chips to be discharged through the gap. This naturally achieves a self-screening effect of retaining effective particles and automatically separating waste chips, ensuring the cleanliness of the free abrasive in the grinding area, maintaining the grinding quality of the free abrasive, and reducing the impact on the grinding quality of the plastic wheel hub.

[0017] By incorporating a feeding mechanism, a chip-blocking edge, and a weak air mechanism, the weak air mechanism continuously cools the grinding zone, workpiece, and grinding wheel, preventing the plastic wheel hub from overheating, softening, deforming, or becoming pasty. Simultaneously, it applies a pushing force to the plastic debris between the grinding particles, causing it to be discharged through the gaps in the chip-blocking edge. This further ensures the cleanliness of the free abrasive in the grinding zone, maintains the grinding quality of the free abrasive, and reduces the impact on the grinding quality of the plastic wheel hub. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0019] Referring to the accompanying drawings and the following detailed description, this application can be more clearly understood, wherein: Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the internal structure of the working box of the present invention; Figure 3 is a schematic diagram of the structure composed of the fixing mechanism and the grinding mechanism of the present invention; Figure 4 is a schematic diagram of the wedge-shaped triangular area surrounded by the plastic hub and the grinding wheel of the present invention; Figure 5 is a schematic diagram of the pressing plate connection structure of the present invention; Figure 6 is a schematic diagram of the opening state of the particle groove of the present invention; Figure 7 is a schematic diagram of the working state of the particle groove and the grinding particles of the present invention.

[0020] In the diagram: 1. Support platform; 2. Working box; 3. Fixing mechanism; 30. Translation cylinder; 31. Rotating table; 32. Centripetal chuck; 4. Grinding mechanism; 40. Gearbox; 41. Grinding wheel; 42. Rotary motor; 5. Feeding mechanism; 50. Feeding head; 51. Feeding pipe; 6. Chip guard; 7. Pressing plate; 8. Weak air mechanism; 80. Air conveying pipe; 81. Air conveying head; 82. Air outlet; 9. Auxiliary air inlet mechanism; 90. Guide sleeve; 91. Extrusion plate; 92. Lifting cylinder; 93. Granulation trough. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] Example 1: Please refer to Figures 1-7. A grinding machine for plastic wheels of toy cars includes a support platform 1. A work box 2 is fixedly installed on the upper side of the support platform 1. The cover of the work box 2 is made of transparent material. A fixing mechanism 3 is provided inside the work box 2 to clamp the plastic wheel hub. A grinding mechanism 4 is provided in the inner cavity of the work box 2. The grinding mechanism 4 includes a grinding wheel 41. A feeding mechanism 5 is provided in the inner cavity of the work box 2, located above the plastic wheel hub and the grinding wheel 41, for feeding... Mechanism 5 includes a feeding head 50 and a feeding pipe 51. There are two wedge-shaped triangular areas between the plastic hub and the grinding wheel 41. The feeding head 50 is located above the upper wedge-shaped triangular area. The feeding pipe 51 is connected to the upper side of the feeding head 50. The feed head of the feeding pipe 51 is fixedly installed on the upper side of the working box 2. An external conveying device conveys grinding particles (particle size of 0.3-1 mm) to the upper wedge-shaped triangular area through the feeding pipe 51 and the feeding head 50. The grinding particles are nylon particles.

[0023] In use, first, the plastic wheel hub is placed into the work box 2 and clamped by the fixing mechanism 3. Then, the work box 2 is sealed with a cover. Next, the plastic wheel hub is brought into contact with the grinding wheel 41, and the two are made to rotate in the same direction at a different speed (the rotation speed of the grinding wheel 41 is greater than that of the plastic wheel hub). At the same time, the external conveying device conveys abrasive particles to the upper wedge-shaped triangular area through the discharge pipe 51 and the discharge head 50. The grinding wheel 41 provides basic shaping and deburring capabilities. The abrasive particles, as free abrasives, are continuously bitten into the contact grinding area by the two wheels rotating in the same direction at different speeds, forming rolling grinding + rolling polishing. The combined effect of the grinding wheel 41 and the plastic hub rotating in the same direction with the grinding wheel 41 rotating faster than the hub, creates a wedge-shaped triangular area where the grinding particles are continuously bitten, held, and driven by the traction force generated by the relative motion of the wheels. The particles undergo continuous rolling displacement between the hub and the grinding wheel 41, uniformly grinding the side of the hub through rolling contact, avoiding scratches, stress concentration, and workpiece deformation caused by traditional sliding friction, and achieving gentle and uniform rolling grinding; the nylon particles themselves have a certain toughness and deformation capacity, and under the clamping pressure of the hub and the grinding wheel 41, they produce a slight elasticity on the surface of the plastic hub. The rolling action gradually flattens and densifies the microscopic protrusions on the surface. Simultaneously, the particles and the workpiece surface are in surface / line contact, allowing for a smoothing and strengthening treatment of the shaped wheel hub side surface. This eliminates stress at the root of cutting marks and burrs, improving side surface flatness and smoothness (achieving roll polishing), thus significantly improving grinding quality. Furthermore, the rolling friction of the abrasive particles replaces part of the sliding friction of the grinding wheel 41, greatly reducing grinding heat. This makes the plastic debris less likely to melt due to heat, reducing the amount of plastic slag generated and minimizing the impact on the grinding quality of the plastic wheel hub. Additionally, because the abrasive particles continuously contact... The grinding wheel 41 is touched, and the plastic slag attached to the surface of the grinding wheel 41 is continuously scraped away, realizing the self-cleaning of the grinding wheel 41 (the nylon abrasive particles are clamped between the relative motion interface between the wheel hub and the grinding wheel 41. Under the shearing, squeezing and rolling action generated by the rotation of the two wheels in the same direction at different speeds, the particle surface continuously contacts and rubs against the working surface of the grinding wheel 41, thereby scraping off the attached plastic slag). This solves the common problems of plastic grinding being easy to stick to the wheel, surface pasting, and scratches. After the plastic wheel hub is ground, the plastic wheel hub and the grinding wheel 41 are stopped. Then, the plastic wheel hub is moved away from the grinding wheel 41, and the staff removes the cover and takes out the plastic wheel hub.

[0024] Please refer to Figures 1-7. The fixing mechanism 3 includes a translation cylinder 30, a rotating table 31, and a radial clamping plate 32. The translation cylinder 30 is fixedly installed in the left side wall of the working box 2. The rotating table 31 (a combination of the table body and the power motor) is provided in the inner cavity of the working box 2. The telescopic rod of the translation cylinder 30 is fixedly connected to the rotating table 31. The radial clamping plate 32 is provided on the side of the rotating table 31 facing the opening of the working box 2. The output end of the power motor in the rotating table 31 is fixedly connected to the radial clamping plate 32. The plastic wheel hub is clamped by the radial clamping plate 32.

[0025] When the plastic wheel hub is placed into the inner cavity of the work box 2, the centripetal chuck 32 clamps the plastic wheel hub. Then, the translation cylinder 30 drives the rotating table 31, the centripetal chuck 32 and the plastic wheel hub to move until the plastic wheel hub contacts the grinding wheel 41. Then, the rotating table 31 drives the centripetal chuck 32 and the plastic wheel hub to rotate, thereby realizing the grinding operation of the plastic wheel hub.

[0026] Please refer to Figures 1-7. The grinding mechanism 4 also includes a gearbox 40 and a rotary motor 42. The gearbox 40 is fixedly connected to the inner right side wall of the working box 2. The grinding wheel 41 is located on the side of the gearbox 40 facing the opening of the working box 2. The rotary motor 42 is fixedly installed on the side of the gearbox 40 facing away from the opening of the working box 2. The rotary motor 42 drives the grinding wheel 41 to rotate through the gearbox 40.

[0027] While the plastic wheel hub is rotating, the rotating motor 42 drives the grinding wheel 41 to rotate through the reduction gearbox 40, thereby realizing the grinding operation of the plastic wheel hub.

[0028] Please refer to Figures 1-7. Chip-blocking edges 6 are fixedly installed on both sides of the grinding wheel 41 in the axial direction. The chip-blocking edges 6 on both sides close the axial positions of the upper wedge-shaped triangular area. There is a gap of millimeters (e.g., 0.2 mm) between the opposite sides of the two chip-blocking edges 6 and the plastic hub.

[0029] During the rotation of the grinding wheel 41, the chip-blocking edge 6 rotates synchronously. The chip-blocking edge 6 on both sides of the grinding wheel 41 forms an axial limit, locking the grinding particles in the wedge-shaped grinding area, reducing splash loss. At the same time, only the worn waste particles and plastic chips are allowed to be discharged through the gap (the waste particles are grinding particles smaller than 0.2 mm, and the detached plastic chips are generally 0.1-20 μm). This naturally achieves the self-screening effect of effective particle retention and automatic separation of waste chips, ensuring the cleanliness of the free abrasive in the grinding area, maintaining the grinding quality of the free abrasive, and reducing the impact on the grinding quality of the plastic hub.

[0030] Please refer to Figures 1-7. A pressure plate 7 is provided above the upper wedge-shaped triangular area. The two ends of the pressure plate 7 have gaps in millimeters (e.g., 0.2 mm) with the corresponding plastic hub and grinding wheel 41, respectively. Through the pressure plate 7, the chip-blocking edges 6 on both sides, the plastic hub and the grinding wheel 41, the upper wedge-shaped triangular area is enclosed to form an abrasive space for accommodating grinding particles. The feed pipe 51 is fixedly installed on the pressure plate 7.

[0031] By setting the pressure plate 7, the splashing path of the abrasive particles is further blocked, so that the abrasive particles are all in the working space and participate in the grinding operation, thereby maintaining the grinding quality of the free abrasive and reducing the impact on the grinding quality of the plastic wheel hub.

[0032] The grinding particles are in a gradient ratio of large particle size (0.8-1.0 mm): medium particle size (0.5-0.8 mm): small particle size (0.3-0.5 mm) = 3:5:2. 5%-8% of food-grade white corundum micro powder (5-10 μm) is added to the nylon substrate, and 0.5%-1% by mass of food-grade water-soluble grinding aid is coated on the surface of the grinding particles. The lower side wall of the working box 2 is equipped with a filter screen, and the position inside the support platform 1 corresponding to the filter screen is an existing collection mechanism (such as a collection tank).

[0033] Through the combination of the above-mentioned grinding particle size gradient, large particles provide rigid support and coarse grinding to remove burrs, medium particles undertake the main shaping grinding, and small particles fill the gaps to achieve fine polishing. At the same time, the rolling of large particles can drive the medium and small particles to form turbulence, avoid particle accumulation, enhance the particle circulation feeding efficiency, and solve the problem of material accumulation in the dead corner of the wedge area. By adding 5%-8% food-grade white fused alumina micro powder (5-10μm) to the nylon matrix, the buffer toughness of nylon is retained, while the grinding cutting force and wear resistance are improved. (When white fused alumina micro powder is mixed into nylon grinding particles, a multi-micro-edge structure is formed on the particle surface and inside. During the rolling of the particles with the wheel body, the white fused alumina micro-edges continuously and micro-cut the burrs, flash, and rough particles on the surface of the wheel hub. Because the cutting amount of a single particle is small, and under the support of the tough nylon matrix, only the surface protrusions are micro-cut, which will not cause over-cutting, scratches or chipping of the wheel hub body. Stable micro-cutting is achieved while ensuring the shaping accuracy. At the same time, the white fused alumina micro powder in the grinding particles The surface forms micro-cutting edges with a hardness higher than that of softened plastic slag but lower than that of the grinding wheel 41 (such as a resin grinding wheel). Therefore, during the rolling process, it can scrape and peel off the plastic slag attached to the surface of the grinding wheel 41, and push out and carry out the soft plastic material blocked in the gap between the abrasive grains of the grinding wheel 41. Under the above action, the surface of the grinding wheel 41 will not accumulate slag or stick to the wheel, and the abrasive cutting edge will always be exposed and the cutting state will be stable, thereby realizing the online self-cleaning of the grinding wheel 41, extending the service life of the particles by more than 3 times. It works in synergy with the locking structure (pressing plate 7 and chip guard 6) to greatly reduce the frequency of particle replenishment. By coating the surface of the grinding particles with 0.5%-1% by mass of food-grade water-soluble grinding aid, the lubricity is improved, and the grinding particles have a slight adhesion, making it easier to adhere to the wheel surface and be carried into the grinding zone. The filter screen set at the bottom of the working box 2 blocks the discharged grinding waste particles, while the plastic debris passes through the filter screen and enters the collection mechanism, thereby realizing the distributed collection and treatment of both.

[0034] Please refer to Figures 1-7. The inner cavity of the working box 2 is equipped with a weak wind mechanism 8. The weak wind mechanism 8 includes an air supply pipe 80, an air supply head 81, and an air outlet 82. The air supply pipe 80 is located above the pressure plate 7. The air inlet of the air supply pipe 80 is fixedly installed on the upper surface of the working box 2 and is connected to the external air supply mechanism. The lower end of the air supply pipe 80 is fixedly connected to the air supply head 81. An air outlet 82 is opened inside the pressure plate 7. The air supply head 81 is connected to the air outlet 82. The air outlet 82 is a linear micro-groove and is inclined towards the plastic hub.

[0035] During the process of the plastic hub and grinding wheel 41 rotating at different speeds in the same direction, driving the grinding particles to grind the hub, the external air supply mechanism delivers low-speed airflow to the upper wedge-shaped triangular area through the air supply pipe 80, air supply head 81, and air outlet 82. This low-speed airflow continuously cools the grinding area, hub, and grinding wheel 41, preventing the plastic hub from overheating, softening, deforming, or becoming pasty, thus maintaining the grinding quality of the hub. At the same time, it applies a pushing force to the plastic debris between the grinding particles, causing it to be discharged from the gap between the chip retainer 6 and the hub, thereby further ensuring the cleanliness of the free abrasive in the grinding area and maintaining the grinding of the free abrasive. This improves the quality of grinding plastic wheels and reduces the impact on the grinding quality. Furthermore, because the low-speed airflow directly contacts the grinding particles on the surface of the wedge-shaped triangular area, the grinding particles closer to the wheel hub are driven downwards by the plastic wheel hub, while the grinding particles closer to the grinding wheel 41 are driven upwards by the grinding wheel 41. This results in a continuous circulation of grinding particles that are constantly blown by the low-speed airflow, move to contact the wheel hub, are driven downwards by the wheel hub, and then receive a weak airflow. Through this continuous circulation of grinding particles, the low-temperature grinding particles continuously carry away the heat from the wheel hub, thus preventing the wheel hub from overheating and softening, and maintaining the grinding quality of the wheel hub.

[0036] Example 2: Please refer to Figures 1-7. The inner cavity of the working box 2 is provided with an auxiliary air intake mechanism 9. The auxiliary air intake mechanism 9 includes a guide sleeve 90, a pressing plate 91, and a lifting cylinder 92. The guide sleeve 90 is located above the pressing plate 7. The pressing plate 7 is fixedly connected to the working box 2 through the guide sleeve 90. The pressing plate 91 is slidably installed in the inner cavity of the guide sleeve 90. The lower end of the pressing plate 91 extends out of the pressing plate 7 and enters the upper wedge-shaped triangular area. The lifting cylinder 92 is fixedly installed in the upper side wall of the working box 2. The telescopic rod of the lifting cylinder 92 extends into the inner cavity of the guide sleeve 90 and is fixedly connected to the pressing plate 91.

[0037] During the process of blowing a low-speed airflow into the grinding particles in the upper wedge-shaped triangular area from the air outlet 82, the telescopic rod of the lifting cylinder 92 reciprocates and extends, causing the extrusion plate 91 to intermittently extend into the grinding particles in the upper wedge-shaped triangular area. When the extrusion plate 91 extends into the grinding particles, the low-speed airflow is blocked by the extrusion plate 91 and moves downward along the surface of the extrusion plate 91, penetrating into the grinding particles. This causes plastic debris to be discharged through the gap between the chip-blocking edge 6 and the wheel hub, ensuring the cleanliness of the free abrasive in the grinding area, maintaining the grinding quality of the free abrasive, and reducing the impact on the grinding quality of the plastic wheel hub.

[0038] Please refer to Figures 1-7. The auxiliary air intake mechanism 9 also includes a particle groove 93. The extrusion plate 91 has a particle groove 93 equidistantly opened on the side facing the grinding wheel 41. The particle groove 93 has a long opening facing the grinding wheel 41 and a short opening facing the upper wedge-shaped triangular area. The diameter of the particle groove 93 is 1.2 times the diameter of the grinding particles.

[0039] During the process of the extrusion plate 91 extending into the abrasive particles, some abrasive particles will enter the particle groove 93. Since the diameter of the particle groove 93 is slightly larger than the diameter of the abrasive particles, when the abrasive particles enter the particle groove 93, the remaining abrasive particles will be blocked by the particles, thus freeing up the remaining space in the particle groove 93. This facilitates the passage of the low-speed airflow moving downward along the extrusion plate 91, allowing the low-speed airflow to further penetrate into the abrasive particles, accelerating the cooling of the abrasive particles and the forceful discharge of plastic debris. This further prevents the hub from overheating and softening, ensuring the cleanliness of the free abrasive in the grinding area, maintaining the grinding quality of the free abrasive, and reducing the impact on the grinding quality of the plastic hub. In addition, the abrasive particles entering the particle groove 93 receive a better cooling effect. When the extrusion plate 91 moves upward and resets, the abrasive particles return to the particle layer and absorb the heat of the remaining abrasive particles. Through the above actions, the cooling of the abrasive particles is accelerated, further preventing the hub from overheating and softening.

Claims

1. A grinding machine for plastic wheels of toy cars, comprising: A support platform (1) is provided, and a work box (2) is fixedly installed on the upper side of the support platform (1). A fixing mechanism (3) is provided inside the work box (2) to clamp the plastic wheel hub. A grinding mechanism (4) is provided in the inner cavity of the work box (2). The grinding mechanism (4) includes a grinding wheel (41). A feeding mechanism (5) is provided in the inner cavity of the work box (2) and located above the plastic wheel hub and the grinding wheel (41). The feeding mechanism (5) is characterized in that... Includes: a feeding head (50), with two wedge-shaped triangular areas between the plastic hub and the grinding wheel (41), the feeding head (50) being positioned above the upper wedge-shaped triangular area; a feeding pipe (51), connected to the upper side of the feeding head (50), the feeding head of the feeding pipe (51) being fixedly installed on the upper side of the working box (2), and an external conveying device conveying grinding particles to the upper wedge-shaped triangular area through the feeding pipe (51) and the feeding head (50), the grinding particles being nylon particles.

2. The grinding machine tool for plastic wheels of toy cars according to claim 1, characterized in that, The grinding wheel (41) has chip-blocking edges (6) fixedly installed on both sides in the axial direction. The chip-blocking edges (6) on both sides close the axial positions of the upper wedge-shaped triangular area. The two chip-blocking edges (6) on opposite sides have a gap of millimeters with the plastic hub.

3. The grinding machine tool for plastic wheels of toy cars according to claim 2, characterized in that, A pressure plate (7) is provided above the upper wedge-shaped triangular area. The two ends of the pressure plate (7) have gaps in millimeters with the corresponding plastic hub and grinding wheel (41). Through the pressure plate (7), the chip-blocking edges (6) on both sides, the plastic hub and the grinding wheel (41), the upper wedge-shaped triangular area is enclosed to form an abrasive space for accommodating grinding particles. The discharge pipe (51) is fixedly installed on the pressure plate (7).

4. The grinding machine tool for plastic wheels of toy cars according to claim 1, characterized in that, The grinding particles are in a gradient ratio of large particle size: medium particle size: small particle size = 3:5:

2. 5%-8% of food-grade white corundum micro powder is added to the nylon substrate, and 0.5%-1% by mass of food-grade water-soluble grinding aid is coated on the surface of the grinding particles. The lower side wall of the working box (2) is equipped with a filter screen, and the position of the filter screen inside the support platform (1) is the existing collection mechanism.

5. A grinding machine for plastic wheels of toy cars according to claim 3, characterized in that, The inner cavity of the working box (2) is provided with a weak wind mechanism (8). The weak wind mechanism (8) includes: an air supply pipe (80) located above the pressure plate (7). The air inlet of the air supply pipe (80) is fixedly installed on the upper surface of the working box (2) and connected to the external air supply mechanism; an air supply head (81) fixedly connected to the lower end of the air supply pipe (80); and an air outlet (82) opened inside the pressure plate (7). The air supply head (81) is connected to the air outlet (82). The air outlet (82) is a linear micro-groove and is inclined towards the plastic hub.

6. A grinding machine for plastic wheels of toy cars according to claim 5, characterized in that, The inner cavity of the working box (2) is provided with an auxiliary air intake mechanism (9). The auxiliary air intake mechanism (9) includes: a guide sleeve (90), which is located above the pressure plate (7) and fixes the pressure plate (7) to the working box (2) through the guide sleeve (90); an extrusion plate (91), which is slidably installed in the inner cavity of the guide sleeve (90). The lower end of the extrusion plate (91) extends out of the pressure plate (7) and enters the upper wedge-shaped triangular area; and a lifting cylinder (92), which is fixedly installed in the upper side wall of the working box (2). The telescopic rod of the lifting cylinder (92) extends into the inner cavity of the guide sleeve (90) and is fixedly connected to the extrusion plate (91).

7. A grinding machine for plastic wheels of toy cars according to claim 6, characterized in that, The auxiliary air intake mechanism (9) further includes: a particle groove (93), which is equidistantly opened on the side of the extrusion plate (91) facing the grinding wheel (41). The particle groove (93) has a long opening facing the grinding wheel (41) and a short opening facing the upper wedge-shaped triangular area. The diameter of the particle groove (93) is 1.2 times the diameter of the grinding particles.

8. A grinding machine for plastic wheels of toy cars according to claim 1, characterized in that, The fixing mechanism (3) includes: a translation cylinder (30), which is fixedly installed in the left side wall of the work box (2); a rotating platform (31), which is set in the inner cavity of the work box (2), and the telescopic rod of the translation cylinder (30) is fixedly connected to the rotating platform (31); and a centripetal chuck (32), which is set on the side of the rotating platform (31) facing the opening of the work box (2), and the output end of the power motor in the rotating platform (31) is fixedly connected to the centripetal chuck (32), and the plastic wheel hub is clamped by the centripetal chuck (32).

9. A grinding machine for plastic wheels of toy cars according to claim 1, characterized in that, The grinding mechanism (4) further includes: a reduction gearbox (40) which is fixedly connected to the inner wall of the right side of the working box (2), and the grinding wheel (41) is located on the side of the reduction gearbox (40) facing the opening of the working box (2); a rotating motor (42) which is fixedly installed on the side of the reduction gearbox (40) facing away from the opening of the working box (2), and the rotating motor (42) drives the grinding wheel (41) to rotate through the reduction gearbox (40).

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