Concrete gravel aggregate preparation equipment
The multi-stage grinding disc friction sand making technology of concrete sand and gravel aggregate preparation equipment has solved the problem of reduced sand output caused by the large proportion of powder in the sand making process, and achieved efficient crushing of sand and gravel, reducing losses and operating costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG ZHENQIANG IND CO LTD
- Filing Date
- 2025-04-14
- Publication Date
- 2026-04-17
AI Technical Summary
Existing sand making equipment has a large proportion of powder in the sand making process, which leads to a decrease in sand output and an increase in the sand making cost for enterprises.
A concrete aggregate preparation device is adopted, which uses a low-speed multi-stage friction sand making method with active and passive grinding discs. By utilizing the gradually narrowing grinding gap between the lower and upper grinding grooves, combined with the high wear resistance of alloy grinding discs, it can achieve efficient crushing of sand and gravel and reduce the generation of fine powder.
It improves the sand output rate, reduces wear and operating costs, extends the service life of the grinding disc, and lowers the strength requirements for materials and structures.
Smart Images
Figure CN224127393U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a crushing device, and more particularly to a concrete aggregate preparation device. Background Technology
[0002] With the continuous development of the economy, the demand for cement mortar is increasing, and cement mortar requires a large amount of sand and gravel aggregate. Manufactured sand, due to its clean grains, absence of mud and other harmful impurities, and stable performance, is becoming increasingly popular, leading to a surge in the market for various sand-making machines and equipment.
[0003] The first generation of sand making machines (also called rod mill sand making machines) produced sand through grinding and vertical drop, resulting in poor sand production and low efficiency. Later, with the advent of impact crushers, sand production efficiency was significantly improved. The working principle of an impact crusher is as follows: stones fall naturally and collide with stones accelerated and thrown out by an impeller, thus achieving crushing. The collision between the accelerated stones and the naturally falling stones creates a vortex, resulting in a second crushing process during the return journey. Due to its good sand production effect, simple structure, and low cost, the impact crusher has become the mainstream sand making machine. Later, impact crushers appeared. The working principle is that the stone material falls directly from the top of the impact crusher into the high-speed rotating turntable. Under the action of high-speed centrifugal force, it collides with the impact blocks that are divided into umbrella shapes around the turntable at high speed and crushes them at high density. After the stone material hits each other, it will form a vortex motion between the turntable and the machine casing, resulting in multiple impacts, friction, and crushing until it is crushed into the required particle size.
[0004] The sand making principle of impact crusher is similar to that of impact crusher, and it has a more efficient crushing effect. However, both types of sand making equipment will generate a lot of dust, which is aggregate that is too small in size. This aggregate cannot be used to prepare cement mortar and is waste for mortar production companies. Therefore, it can only be used in other fields, which will increase the sand making cost of enterprises. Utility Model Content
[0005] This invention provides a concrete sand and gravel aggregate preparation device; solving the problem in the prior art where the proportion of powder in the sand making process leads to a decrease in sand output rate.
[0006] The above-mentioned technical problems of this utility model are mainly solved by the following technical solution: a concrete aggregate preparation device, comprising a sand making cylinder, a cylinder cover, several active grinding discs, several passive grinding discs, a rotating shaft vertically rotatably connected between the bottom of the sand making cylinder and the cylinder cover, and a reduction motor driving the rotating shaft to rotate. The active grinding discs are horizontally fixed on the rotating shaft, and the passive grinding discs are horizontally fixed on the inner wall of the sand making cylinder. The upper surface of the active grinding discs is provided with annular downward grinding grooves, and the passive grinding discs are annular with grooves on their lower surface that interact with the downward grinding grooves. The upper abrasive pattern corresponds to the sand pattern. A sanding gap is formed between any two adjacent lower abrasive patterns and the upper abrasive pattern. The sanding gap gradually narrows from top to bottom. A sand discharge area is formed between the outer edge of the active grinding disc and the inner wall of the sand making cylinder. A sand feeding area is formed between the inner edge of the passive grinding disc and the rotating shaft. A funnel component is provided on the lower side of the sand discharge area to guide the falling sand to the sand feeding area. A grid sand discharge port is provided at the bottom of the sand making cylinder. A feed hopper is provided on the cylinder cover. A grid feed port connecting the feed hopper and the lower sand feeding area is provided on the cylinder cover.
[0007] This invention features a feeding hopper for continuously feeding large-sized sand and gravel aggregates. These aggregates fall into the lower sand feeding zone through a mesh feed inlet. A geared motor drives a rotating shaft and all the active grinding discs on it to rotate synchronously at low speed. This creates relative motion between the lower and upper grinding grooves, causing the sand and gravel to continuously roll within the grinding gaps and outwards under centrifugal force. During this rolling process, the grinding gaps alternate between widening and narrowing, crushing the sand and gravel. The crushed aggregate then falls through the discharge zone and slides into the next sand feeding zone via a funnel, repeating the cycle. Because the grinding gaps become smaller towards the bottom, the sand and gravel gradually break down, ultimately yielding the desired aggregate. This invention utilizes low-speed, multi-stage friction grinding between the lower and upper grinding grooves, thus preventing the generation of excessively fine aggregate / powder, resulting in a higher sand output and less loss. Furthermore, the multi-stage crushing method helps reduce stress between the active and passive grinding discs, lowering the strength requirements for materials and structures.
[0008] Furthermore, the rotating shaft is provided with several annular grooves, and two positioning clamping members are clamped in the annular grooves. The active grinding disc is slidably sleeved on the rotating shaft and abuts against the upper side of the positioning clamping members. The outer edge of the passive grinding disc is integrally provided with a stacking ring. The outer contour of the stacking ring is adapted to the inner contour of the sand making cylinder. Adjacent passive grinding discs are stacked up and down in the sand making cylinder through the stacking ring. The cylinder cover abuts against the uppermost stacking ring. The bottom of the inner wall of the sand making cylinder is provided with a supporting ring to support the stacking ring. The active grinding disc is circumferentially fixed relative to the rotating shaft, and the passive grinding disc is circumferentially fixed relative to the sand making cylinder. The funnel component is placed on the upper side of the passive grinding disc. After long-term operation, especially the active and passive grinding discs, wear will occur. Over time, the size of the produced sand and gravel will gradually increase, so it is necessary to replace the active and passive grinding discs regularly. Through the above technical solution, this utility model can realize the removal of all active and passive grinding discs from top to bottom.
[0009] Furthermore, the upper end of the sand-making cylinder is provided with a flange, and a positioning ring is protruding from the upper surface of the flange. The lower surface of the cylinder cover is shaped to match the positioning ring, and a rubber ring is clamped between the cylinder cover and the stacking rings. The function of the rubber ring is to provide pre-tightening force to the stacking rings, ensuring a tight fit between the stacking rings, and also preventing sand and dust from entering the gap between the stacking rings and the sand-making cylinder.
[0010] Furthermore, a lower alloy grinding disc is mounted on the upper surface of the active grinding disc, and the lower abrasive texture is provided on the lower alloy grinding disc. Similarly, an upper alloy grinding disc is mounted on the lower surface of the passive grinding disc, and the upper abrasive texture is provided on the upper alloy grinding disc. Both alloy grinding discs possess high wear resistance and high hardness, thus significantly extending their service life. Furthermore, once the alloy grinding discs wear out, they can be replaced individually, avoiding the need to replace both the active and passive grinding discs entirely, thereby reducing operating costs.
[0011] Furthermore, the upper frosted texture is composed of several circularly arranged first patterns, with the length direction of the first patterns aligned with the center of the circle; the lower frosted texture is composed of several circularly arranged second patterns, which are diagonal patterns; the thickness of both the first and second patterns decreases from the outside to the inside. When the first and second patterns undergo shearing motion, they generate an outward component force on the sand and gravel, which pushes the sand and gravel to roll outward; at the same time, the thickness of both the first and second patterns decreases from the outside to the inside, thus narrowing the abrasion gap from the inside to the outside, which is beneficial for driving the sand and gravel into the abrasion gap.
[0012] Therefore, this utility model has the following characteristics compared with the prior art: 1. This utility model uses low-speed multi-stage friction sanding with lower and upper abrasive textures, which makes it less likely to produce excessively fine aggregates / powder, resulting in a higher sand output rate and less loss. Moreover, the multi-stage crushing method also helps to reduce the stress between the active and passive grinding discs, reducing the strength requirements of materials and structures; 2. This utility model allows all active and passive grinding discs to be removed from top to bottom. At the same time, after the alloy grinding discs are worn, they can be replaced individually, avoiding the need to replace the entire active and passive grinding discs, thus reducing the cost of use. Attached Figure Description
[0013] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;
[0014] Appendix Figure 2 This is a partial structural diagram of the active and passive grinding discs;
[0015] Appendix Figure 3 This is a schematic diagram of the structure of the lower alloy grinding disc;
[0016] Appendix Figure 4 This is a schematic diagram of the structure of the upper alloy grinding disc;
[0017] Appendix Figure 5 This is a diagram showing the combination of two alloy grinding discs stacked together.
[0018] Appendix Figure 6 This is a stress analysis diagram of the first background pattern, the second background pattern, and the sand and gravel.
[0019] Appendix Figure 7 This is a schematic diagram of the mesh feed inlet structure;
[0020] Appendix Figure 8 This is a schematic diagram of the structure of the grid sand discharge outlet;
[0021] Appendix Figure 9 This is a structural diagram of the positioning and clamping component. Detailed Implementation
[0022] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.
[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0024] Example 1: See Figure 1 and Figure 2 A concrete aggregate preparation device includes a sand-making cylinder 100, a cylinder cover 200, three active grinding discs 300, three passive grinding discs 400, a rotating shaft 500 vertically rotatably connected between the bottom of the sand-making cylinder and the cylinder cover, and a reduction motor 600 driving the rotating shaft to rotate. The reduction motor is fixed to the bottom of the sand-making cylinder, and a support base 110 is fixed to the bottom of the sand-making cylinder. Both the active and passive grinding discs are made of cast iron. The active grinding discs are horizontally fixed to the rotating shaft, and the passive grinding discs are horizontally fixed to the inner wall of the sand-making cylinder. The upper surface of the active grinding discs... The device features an annular lower abrasive pattern 310, a ring-shaped passive grinding disc, and an upper abrasive pattern 410 corresponding to the lower abrasive pattern on its lower surface. A grinding gap 10 is formed between any two adjacent lower and upper abrasive patterns, gradually narrowing from top to bottom. A sand discharge zone 20 is formed between the outer edge of the active grinding disc and the inner wall of the sand-making cylinder, and a sand feeding zone 30 is formed between the inner edge of the passive grinding disc and the rotating shaft. A funnel 700 is provided below the sand discharge zone to guide the falling sand towards the sand feeding zone. A grid sand discharge port 120 is provided at the bottom of the sand-making cylinder (see...). Figure 1 and Figure 8 The cylinder cover is equipped with a feed hopper 210, and the cylinder cover is equipped with a grid feed inlet 220 that connects the feed hopper to the sand feeding area below (see...). Figure 1 and Figure 7 ).
[0025] In this embodiment, the feed hopper is used to continuously feed large-sized sand and gravel aggregates. These aggregates fall into the sand feeding zone below through the mesh feed inlet. The geared motor drives the rotating shaft and all the active grinding discs on it to rotate synchronously at low speed. The lower and upper grinding grooves thus generate relative motion, causing the sand and gravel to continuously roll within the grinding gaps and roll outwards under the action of centrifugal force. During the rolling process, the grinding gaps alternate between widening and narrowing, which crushes the sand and gravel. The aggregate then falls through the sand discharge zone and slides into the next sand feeding zone through the funnel, thus repeating the cycle. Since the grinding gaps become smaller towards the bottom, the sand and gravel gradually break down, ultimately yielding cost-effective sand and gravel aggregates. This embodiment uses low-speed, multi-stage friction sand making with lower and upper grinding grooves, thus preventing the generation of excessively fine aggregates / powder, resulting in a higher sand output rate and less loss. Moreover, the multi-stage crushing method also helps to reduce the stress between the active and passive grinding discs, reducing the strength requirements for materials and structures.
[0026] For details, see Figure 1 and Figure 9 The rotating shaft has three annular slots 510, each holding two positioning clamping parts 520. These clamping parts are fixed by bolts and form an annular embrace around the outside of the annular slots. The active grinding disc is slidably sleeved on the rotating shaft and abuts against the upper side of the positioning clamping parts. The outer edge of the passive grinding disc has an integrally formed stacking ring 420. The outer contour of the stacking ring matches the inner contour of the sand-making cylinder. Adjacent passive grinding discs are stacked vertically within the sand-making cylinder via the stacking rings. The cylinder cover abuts against the uppermost stacking ring. The bottom of the inner wall of the sand-making cylinder has a supporting ring 130 to support the stacking rings. The active grinding disc is circumferentially fixed relative to the rotating shaft, and the passive grinding disc is circumferentially fixed relative to the sand-making cylinder. The fixing method is a splined shaft and splined sleeve. A funnel-shaped component is placed on top of the passive grinding disc. The funnel-shaped component is made of plastic, which helps reduce cost and weight. In this embodiment, after prolonged operation, especially the active and passive grinding discs, wear will occur. Over time, the size of the produced sand and gravel will gradually increase, thus requiring periodic replacement of the active and passive grinding discs. This embodiment, through the above technical solution, enables the removal of all active and passive grinding discs from top to bottom.
[0027] For details, see Figure 1 The upper end of the sand-making cylinder is provided with a flange 140, and a positioning ring 150 is protruding from the upper surface of the flange. The lower surface of the cylinder cover is shaped to match the positioning ring. The cylinder cover is fixed to the upper side of the flange by bolts. A rubber ring 160 is clamped between the cylinder cover and the stacking rings. The function of the rubber ring is to provide pre-tightening force to the stacking rings, ensuring that the stacking rings are tightly abutted together, and at the same time, to prevent sand and dust from entering the gap between the stacking rings and the sand-making cylinder.
[0028] For details, see Figure 2The upper surface of the active grinding disc is equipped with a lower alloy grinding disc 320, with abrasive texture on the lower alloy grinding disc. The lower surface of the passive grinding disc is equipped with an upper alloy grinding disc 430, with abrasive texture on the upper alloy grinding disc. Both alloy grinding discs have high wear resistance and high hardness, thus significantly extending their service life. Furthermore, once the alloy grinding discs wear out, they can be replaced individually, avoiding the need to replace both the active and passive grinding discs entirely, thereby reducing operating costs.
[0029] For details, see Figure 3 , Figure 4 , Figure 5 and Figure 6 The upper frosted texture consists of several circularly arranged first base patterns 411, with the length direction of the first base patterns aligned with the center of the circle; the lower frosted texture consists of several circularly arranged second base patterns 311, which are oblique patterns; the thickness of both the first and second base patterns decreases from the outside to the inside. When the first and second base patterns undergo shearing motion, they generate an outward component force on the sand and gravel, which pushes the sand and gravel to roll outward; at the same time, the thickness of both the first and second base patterns decreases from the outside to the inside, thus narrowing the abrasion gap from the inside to the outside, which is beneficial for driving the sand and gravel to roll into the abrasion gap.
[0030] This invention can be modified in many ways, as will be apparent to those skilled in the art, and such modifications are not considered to depart from the scope of this invention. All such modifications that are obvious to those skilled in the art are included within the scope of these claims.
Claims
1. A concrete aggregate production plant, characterized by: The system includes a sand-making cylinder, a cylinder cover, several active grinding discs, several passive grinding discs, a rotating shaft vertically rotatably connected between the bottom of the sand-making cylinder and the cylinder cover, and a reduction motor driving the rotating shaft. The active grinding discs are horizontally fixed on the rotating shaft, and the passive grinding discs are horizontally fixed on the inner wall of the sand-making cylinder. The upper surface of the active grinding discs is provided with annular lower grinding patterns, and the passive grinding discs are annular with upper grinding patterns corresponding to the lower grinding patterns on their lower surface. Any two adjacent lower grinding patterns... A sanding gap is formed between the sanding pattern and the upper sanding pattern. The sanding gap gradually narrows from top to bottom. A sand discharge area is formed between the outer edge of the active grinding disc and the inner wall of the sand making cylinder. A sand feeding area is formed between the inner edge of the passive grinding disc and the rotating shaft. A funnel component is provided on the lower side of the sand discharge area to guide the falling sand to the sand feeding area. A grid sand discharge port is provided at the bottom of the sand making cylinder. A feed hopper is provided on the cylinder cover. A grid feed port connecting the feed hopper and the lower sand feeding area is provided on the cylinder cover.
2. Concrete aggregate production plant according to claim 1, characterized in that The rotating shaft is provided with several annular grooves, and two positioning clamping members are clamped in the annular grooves. The active grinding disc is slidably sleeved on the rotating shaft and abuts against the upper side of the positioning clamping members. The outer edge of the passive grinding disc is integrally provided with a stacking ring. The outer contour of the stacking ring is adapted to the inner contour of the sand making cylinder. Adjacent passive grinding discs are stacked up and down in the sand making cylinder through the stacking ring. The cylinder cover abuts against the uppermost stacking ring. The bottom of the inner wall of the sand making cylinder is provided with a supporting ring to support the stacking ring. The active grinding disc is circumferentially fixed relative to the rotating shaft, and the passive grinding disc is circumferentially fixed relative to the sand making cylinder. The funnel is placed on the upper side of the passive grinding disc.
3. Concrete aggregate production plant according to claim 2, characterized in that The upper end of the sand making cylinder is provided with a flange, and a positioning ring is protruding on the upper surface of the flange. The lower surface of the cylinder cover is adapted to the positioning ring, and a rubber ring is clamped between the cylinder cover and the stacking ring.
4. The concrete aggregate production plant of claim 1, wherein: The upper surface of the active grinding disc is equipped with a lower alloy grinding disc, and the lower abrasive texture is provided on the lower alloy grinding disc. The lower surface of the passive grinding disc is equipped with an upper alloy grinding disc, and the upper abrasive texture is provided on the upper alloy grinding disc.
5. Concrete aggregate production plant according to claim 4, characterized in that The upper frosted texture is composed of a first base pattern distributed in a circular array, with the length direction of the first base pattern facing the center of the circle; the lower frosted texture is composed of a second base pattern distributed in a circular array, with the second base pattern being a diagonal pattern; the thickness of both the first base pattern and the second base pattern is set to decrease from the outside to the inside.