Sand making machine with double-layer nested crushing cavity structure

Abstract

The invention belongs to the technical field of sand making machines, and particularly relates to a sand making machine with a double-layer nested crushing cavity structure. The sand making machine provided by the invention has various crushing modes of impact crushing and'stone-to-stone 'crushing, has multi-stage crushing steps of crushing in the crushing inner cavity and crushing in the crushing outer cavity, and is provided with a throwing head structure convenient for particle size screening. According to the innovative crushing mode, the probability of mutual collision of the materials is greatly increased, the crushing efficiency is remarkably improved, the materials can be fully crushed, the particle size of the materials is effectively refined, the particle size of the finished materials is more uniform, and the application requirement of a higher standard is met. Meanwhile, the impact and abrasion effects of the materials on the impact plate are reduced through the crushing mode with the stone-to-stone crushing as the leading mode, the service life of the impact plate is prolonged, the use cost of the equipment is reduced, and the operation stability of the equipment is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sand making machines, and in particular relates to a sand making machine with a double-layer nested crushing chamber structure. Background Art

[0002] As a key equipment that can crush various ores, rocks and other materials into sand that meets the specifications for construction, sand making machines are widely and importantly used in many infrastructure construction fields such as construction, roads, railways, and water conservancy. Among them, the working principle of the impact sand making machine is to accelerate the material with the help of a high-speed rotating impeller, so that the material obtains huge kinetic energy. When the material is thrown out from the impeller, it will impact the material lining or impact plate in the vortex crushing chamber and be crushed. The material is crushed into particles of the required size and enters the discharge port.

[0003] At present, although impact sand making machines are widely used, there are many shortcomings that need to be solved. First of all, in terms of the structure of the crushing chamber, the structure of the crushing chamber of the traditional impact sand making machine is simple, and the material movement trajectory is single, which easily leads to some materials being thrown out of the crushing chamber before they are fully crushed, and then the particle size of the final crushed materials varies greatly, which is difficult to meet some application scenarios that require high uniformity of finished product particle size. Secondly, the key parts of the impeller, impact plate and other wearing parts are subjected to the impact of materials for a long time, which is prone to failure, greatly affecting the overall service life and crushing effect of the sand making machine. In addition, frequent replacement of these parts will not only increase the cost of equipment use, but also reduce the operating efficiency of the equipment, which is not conducive to the stable and efficient operation of the equipment. At present, the single crushing method used by the impact sand making machine has obvious limitations, and it is difficult to ensure the uniform particle size distribution and ideal particle shape of the final product, and it cannot fully meet the growing demand for efficient sand making machines in industries such as construction and mining.

[0004] The Chinese patent document with publication number CN109092498A discloses a new type of sand making machine, which is designed with a cone with a screening structure below the feed port, and divides a single feed bin into multiple groups, which can divide the material into multiple groups according to the particle size and introduce them into the entrances of multiple feed chambers respectively. By setting different acceleration processes, materials of different particle sizes are accelerated to the required speed to improve the work efficiency of the impeller of the crushing chamber. The Chinese patent document with publication number CN109622174A discloses a screening body device for pre-screening materials before crushing, and the screening body is provided with a screening inlet and a screening outlet for the materials to enter and exit respectively. The screening inlet can screen the material into fine particles and coarse particles, allowing the fine particles to enter the outer area of ​​the impeller of the crushing chamber so that they are directly discharged from the crushing chamber without participating in the crushing process. In this way, while reducing the power loss of the sand making machine, it also reduces the amount of dust in the crushing operation, which not only improves the efficiency of the crushing operation, but also makes the operation process more environmentally friendly.

[0005] The above two patents designed and optimized the screening structure of the sand making machine, but did not improve the structure of its crushing chamber. After the screened material enters the crushing chamber, it only hits the impact plate under the action of centrifugal force, resulting in impact crushing. This single crushing mode not only fails to fully crush the material, resulting in uneven particle size distribution of the finished material, but also greatly wastes the cavity space, which has an adverse effect on the crushing efficiency. In addition, the direct contact between large-particle materials and the cavity wall can easily cause damage to the cavity wall, resulting in a reduction in the service life of the sand making machine, which is not conducive to the improvement of the overall performance of the sand making machine and its long-term stable use. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned problems existing in the traditional technology and provide a sand making machine with a double-layer nested crushing chamber structure.

[0007] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0008] The present invention provides a sand making machine with a double-layer nested crushing chamber structure, comprising a sand making machine housing, a coaxial reversing transmission mechanism, a direct-connected driving device, a material distribution pile and a crushing device; a feed port serving as a material entry channel is installed at the top of the sand making machine housing, and a discharge port serving as a material discharge channel is installed at the bottom of the sand making machine housing; a coaxial reversing transmission mechanism is installed at the bottom end of the sand making machine housing, and a direct-connected driving device is installed outside the sand making machine housing, and the direct-connected driving device can drive the material distribution pile and the crushing device to move by driving the coaxial reversing transmission mechanism, thereby realizing the crushing and refinement of the material.

[0009] Furthermore, in the sand making machine with a double-layer nested crushing chamber structure, the direct drive device comprises a high-power direct-connected variable frequency motor and a motor bracket, and the high-power direct-connected variable frequency motor is fixed to the sand making machine housing through the motor bracket. The high-power direct-connected variable frequency motor is selected to have an adjustable speed of 1000 to 3000 r / min. Before crushing, according to the material properties, the initial material particle size, and the required finished material particle size, the appropriate speed can be set to generate the corresponding centrifugal force, thereby controlling the degree of material crushing to obtain the material of the required particle size.

[0010] Furthermore, in the above-mentioned sand making machine with a double-layer nested crushing chamber structure, the crushing device includes a base plate and an annular impact plate arranged on its periphery; an inner ring cavity wall and an outer ring cavity wall are installed on the base plate, the inner ring cavity wall is an arc protruding outward, and the outer surface of the inner ring cavity wall is provided with an inner ring cavity wall impact plate; the outer ring cavity wall is an arc protruding outward, and the inner surface of the outer ring cavity wall is provided with an outer ring cavity wall impact plate, and the annular impact plate is fixed on the sand making machine housing, the area between the inner ring cavity wall and the outer ring cavity wall serves as the crushing inner cavity, and the area between the outer ring cavity wall and the annular impact plate serves as the crushing outer cavity.

[0011] Furthermore, in the sand making machine with a double-layer nested crushing chamber structure, the inner ring cavity wall and the outer ring cavity wall are set to be arc-shaped protruding outward, with an arc of 1 to 2 rad, and the number of the inner ring cavity wall and the outer ring cavity wall is 3. The area between the inner ring cavity wall and the outer ring cavity wall is the crushing inner cavity, and the area between the outer ring cavity wall and the annular impact plate is the crushing outer cavity. The design of the annular cavity wall reduces the speed loss when the material collides with the cavity wall, increases the impact of the material when it is thrown out by the throwing head and collides with the impact plate, and improves the crushing efficiency. The arc design of the cavity wall can reduce the impact of the material on the cavity wall and the impact plate, avoid the cavity wall and the impact plate from being damaged under the impact of the material, cause unnecessary losses and extend the service life of the sand making machine. The radius of the crushing outer cavity is larger than the crushing inner cavity, which can generate greater centrifugal force. The material will be further refined when it collides with the impact plate under the action of greater centrifugal force, which can reduce the discharge particle size of the finished material.

[0012] Furthermore, in the sand making machine with double-layer nested crushing chamber structure, the outer surface of the inner ring cavity wall and the inner surface of the outer ring cavity wall are provided with impact plates, and the impact plates include the inner ring cavity wall impact plate and the outer ring cavity wall impact plate, which are close to one side of the cavity wall and rotate together with the cavity wall. Under the centrifugal force and the impact of the inner ring cavity wall impact plate and the outer ring cavity wall impact plate, the material moves to the central area of ​​the crushing cavity. A large amount of material is concentrated in the central area of ​​the crushing cavity, which greatly increases the probability of material collision. The crushing mode of the crushing cavity is dominated by "stone hitting stone" crushing, accounting for 60-80%, supplemented by the impact crushing of the inner ring cavity wall impact plate and the outer ring cavity wall impact plate. This multi-mode crushing mode greatly improves the crushing efficiency. At the same time, the crushing mode dominated by "stone hitting stone" crushing effectively reduces the impact and wear of the material on the inner ring cavity wall impact plate and the outer ring cavity wall impact plate, and prolongs the service life of the above impact plate.

[0013] Furthermore, in the sand making machine with double-layer nested crushing chamber structure, the crushing inner chamber is controlled by the transmission inner shaft and rotates clockwise, and the crushing outer chamber is controlled by the transmission outer shaft and rotates counterclockwise. Large-size materials move to the center area of ​​the crushing inner chamber under the action of the clockwise centrifugal force of the crushing inner chamber, and small-size materials move to the outer ring cavity wall impact plate under the action of the clockwise centrifugal force of the crushing inner chamber for impact crushing, and are affected by the counterclockwise centrifugal force generated by the counterclockwise rotation of the crushing outer chamber. Most of them move counterclockwise in the outer area of ​​the crushing inner chamber, and are crushed by the large-size materials rotating clockwise in the center area of ​​the crushing inner chamber and the subsequent entering materials. A small part moves counterclockwise to the inner ring cavity wall impact plate, and is crushed again. Impact crushing occurs and is affected by the clockwise centrifugal force generated by the clockwise rotation of the crushing inner chamber. It moves clockwise to the center area of ​​the crushing inner chamber, and is crushed by the materials in the center area of ​​the crushing inner chamber again. This multi-mode crushing mode gives full play to the centrifugal force and greatly improves the crushing efficiency. Under the joint action of the inner ring cavity wall impact plate and the outer ring cavity wall impact plate, the materials are concentrated in the central area of ​​the crushing cavity, thereby increasing the number of "stone-on-stone" crushing times, allowing the materials to fully and intensively collide with each other, thereby achieving further refinement of the materials.

[0014] Furthermore, in the above-mentioned sand making machine with a double-layer nested crushing chamber structure, the coaxial reverse transmission mechanism includes a driving shaft, a transmission inner shaft, a transmission outer shaft, a driving shaft bevel gear, a driven outer shaft bevel gear, a driven inner shaft bevel gear and a retaining frame; the transmission inner shaft is passed through the interior of the transmission outer shaft, and the driving shaft, the transmission inner shaft and the transmission outer shaft are all movably supported by the retaining frame, one end of the driving shaft is connected to the output end of the high-power direct-connected frequency conversion motor, and the other end of the driving shaft is equipped with a driving shaft bevel gear, one end of the transmission inner shaft is equipped with a driven inner shaft bevel gear meshing with the driving shaft bevel gear, the other end of the transmission inner shaft is equipped with a material distribution pile and a crushing inner chamber, one end of the transmission outer shaft is equipped with a driven outer shaft bevel gear meshing with the driving shaft bevel gear, and the other end of the transmission outer shaft is connected to the crushing outer chamber.

[0015] Furthermore, in the above-mentioned sand making machine with a double-layer nested crushing chamber structure, a first connecting piece for facilitating connection with the material distribution pile and the crushing inner chamber is installed on the transmission inner shaft, and a second connecting piece for facilitating connection with the crushing outer chamber is installed on the transmission outer shaft.

[0016] Furthermore, in the above-mentioned sand making machine with a double-layer nested crushing chamber structure, a throwing head is provided at the front end of the outer ring cavity wall, and the throwing head comprises a connected wear-resistant module and a limiting device. The wear-resistant module is a detachable structure, and a bolt hole adapted to the outer ring cavity wall is provided at the front end, and the wear-resistant module is fixed on the outer ring cavity wall.

[0017] Furthermore, in the above-mentioned sand making machine with a double-layer nested crushing chamber structure, the method for using the sand making machine comprises the following steps:

[0018] S1. Feeding: According to the required particle size of the crushed material, select the limit devices with different inclination angles and install them at the front end of the throwing head. After completion, start the direct drive device to drive the material pile, the crushing inner cavity and the crushing outer cavity to rotate simultaneously, and set the appropriate motor speed according to the material properties, the initial material particle size, and the required finished material particle size to ensure that the required particle size can be obtained after crushing; after the motor is started and reaches the set speed, put the crushed material into the feed port;

[0019] S2. Inner cavity crushing: The material enters from the feed port and enters the crushing cavity under the action of the material pile. The crushing cavity rotates clockwise. The material is affected by the clockwise centrifugal force generated by the clockwise rotation of the crushing cavity. The large-sized material moves clockwise to the center of the crushing cavity, and the small-sized material moves clockwise to the impact plate of the outer cavity wall. Impact crushing occurs and the material is affected by the counterclockwise centrifugal force generated by the counterclockwise rotation of the crushing outer cavity. Most of the material moves counterclockwise in the outer area of ​​the crushing cavity, and the material moves clockwise in the center area of ​​the crushing cavity. The clockwise rotating large-size materials and subsequent incoming materials are crushed by "stone hitting stone". A small part moves counterclockwise to the impact plate of the inner cavity wall, is impact-crushed again, and is affected by the clockwise centrifugal force generated by the clockwise rotation of the crushing cavity. It moves clockwise to the center area of ​​the crushing cavity and is crushed by "stone hitting stone" with the materials in the center area of ​​the crushing cavity again. When the material is fully crushed in the crushing cavity, the particle size is smaller than the size set by the throwing head limit device. Under the action of centrifugal force, the material will pass through the throwing head and enter the crushing outer cavity.

[0020] S3. External chamber crushing: After being crushed in the inner chamber, the material enters the crushing outer chamber under the action of centrifugal force. The crushing outer chamber rotates counterclockwise. The material moves to the annular impact plate under the action of the counterclockwise centrifugal force generated by the counterclockwise rotation of the crushing outer chamber. After contacting the annular impact plate, it is impact crushed and further refined. Finally, it falls under the action of gravity and enters the discharge port.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention provides a sand making machine with a double-layer nested crushing chamber structure, wherein the crushing chamber structure includes an inner ring chamber wall and an outer ring chamber wall, wherein the inner ring chamber wall and the outer ring chamber wall are configured to be arc-shaped protruding outwards, and the arc is 1 to 2 rad. The number of the inner ring chamber wall and the outer ring chamber wall is 3, and the area between the inner ring chamber wall and the outer ring chamber wall is the crushing inner chamber, and the area between the outer ring chamber wall and the annular impact plate is the crushing outer chamber. The arc-shaped design of the chamber wall can reduce the speed loss when the material collides with the chamber wall, increase the impact effect when the material is thrown out by the throwing head and collides with the impact plate, and improve the crushing efficiency. The arc-shaped design can also reduce the impact effect of the material on the chamber wall and the impact plate, and avoid the chamber wall and the impact plate from being damaged under the impact of the material, causing unnecessary losses and extending the service life of the sand making machine.

[0023] 2. The sand making machine of the present invention has a double-layer nested crushing chamber structure. The crushing chamber structure includes a crushing inner chamber and a crushing outer chamber. Materials at different crushing stages are in different chambers. This multi-stage crushing step improves the crushing efficiency while making full use of the crushing chamber space, making it easier to control the uniformity of the crushed material particle size. Compared with the traditional crushing chamber structure, the crushing outer chamber has a larger radius and can generate greater centrifugal force, thereby enhancing the crushing effect of impact crushing and "stone-on-stone" crushing, and further refining the material;

[0024] 3. A sand making machine with a double-layer nested crushing chamber structure according to the present invention has impact plates on the outer surface of the inner ring cavity wall and the inner surface of the outer ring cavity wall. The impact plates include an inner ring cavity wall impact plate and an outer ring cavity wall impact plate, which are close to one side of the cavity wall and rotate with the cavity wall. Under the centrifugal force and the impact of the inner ring cavity wall impact plate and the outer ring cavity wall impact plate, the material moves toward the central area of ​​the crushing cavity. A large amount of material is concentrated in the central area of ​​the crushing cavity, which greatly increases the probability of material collision with each other. The crushing mode of the crushing cavity is dominated by "stone hitting stone" crushing, accounting for 60-80%, supplemented by the impact crushing of the inner ring cavity wall impact plate and the outer ring cavity wall impact plate. This multi-mode crushing mode greatly improves the crushing efficiency. At the same time, the crushing mode dominated by "stone hitting stone" crushing effectively reduces the impact and wear of the material on the inner ring cavity wall impact plate and the outer ring cavity wall impact plate, and extends the service life of the above-mentioned impact plate;

[0025] 4. In the sand making machine with a double-layer nested crushing chamber structure of the present invention, large-size materials move to the center area of ​​the crushing chamber under the action of the clockwise centrifugal force of the crushing chamber, and small-size materials move to the outer ring cavity wall impact plate under the action of the clockwise centrifugal force of the crushing chamber to be impact crushed, and are affected by the counterclockwise centrifugal force generated by the counterclockwise rotation of the crushing outer cavity. Most of them move counterclockwise in the outer area of ​​the crushing chamber, and are crushed by the large-size materials rotating clockwise in the center area of ​​the crushing chamber and the subsequent materials. A small part moves counterclockwise to the inner ring cavity wall impact plate, and is impact crushed again. Under the clockwise centrifugal force generated by the clockwise rotation of the crushing chamber, it moves clockwise to the center area of ​​the crushing chamber, and is crushed by the materials in the center area of ​​the crushing chamber again. This multi-mode crushing mode gives full play to the centrifugal force and greatly improves the crushing efficiency. Under the joint action of the inner ring cavity wall impact plate and the outer ring cavity wall impact plate, the materials are concentrated in the center area of ​​the crushing cavity, thereby increasing the number of "stone-to-stone" crushing times, allowing the materials to fully and densely collide with each other, thereby achieving further refinement of the materials. In addition, compared with the traditional sand making machine crushing method, this method of crushing the materials in the crushing cavity and screening by the throwing head has a smaller and more evenly distributed particle size and regular shape, which greatly reduces the impact and wear on the annular impact plate, thereby extending the service life of the annular impact plate;

[0026] 5. The sand making machine of the present invention has a double-layer nested crushing chamber structure. The coaxial reversing transmission mechanism can make the sand making machine driven by a single direct-connected drive device, and simultaneously control the inner crushing chamber and the outer crushing chamber to rotate in opposite directions. Compared with the transmission structure of the traditional sand making machine, the coaxial reversing transmission mechanism improves the space utilization rate and crushing efficiency of the crushing chamber without increasing the number of motors. The direct-connected drive device adopts a high-power direct-connected variable-frequency motor with adjustable speed. Before crushing, according to the properties of the material, the initial material particle size, and the required finished material particle size, the appropriate speed can be set to generate the corresponding centrifugal force, thereby controlling the degree of material crushing to obtain materials of the required particle size;

[0027] 6. A sand making machine with a double-layer nested crushing chamber structure of the present invention, the throwing head includes a wear-resistant module and a limit device, the wear-resistant module is a detachable structure, and the front end is provided with a bolt hole adapted to the outer ring cavity wall, and is fixed on the outer ring cavity wall. When the wear-resistant module fails, it can be disassembled and replaced separately, which improves the maintenance efficiency and reduces the maintenance cost. The limit device is a triangular prism structure, one side of the right-angle surface contacts the outer ring cavity wall, and the other side extends to the inside of the crushing cavity at a certain angle of 30 to 60 degrees. The limit device forms a certain angle with the outer ring cavity wall, which limits the particle size of the material when it is thrown out from the throwing head. The limit device with different angles can be selected before crushing to limit the particle size of the material when it is thrown out from the throwing head, so as to avoid large particles of material being thrown out before being fully crushed, thereby controlling the particle size of the material during the crushing process, which can not only reduce the screening process of the material before crushing, but also ensure the uniformity of the crushed material.

[0028] Of course, any product implementing the present invention does not necessarily need to achieve all of the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0030] Figure 1 It is a structural schematic diagram of the sand making machine of the present invention;

[0031] Figure 2 Schematic diagram of the internal structure of the double-layer crushing chamber in the present invention;

[0032] Figure 3 It is a schematic diagram of the crushing process of the sand making machine of the present invention;

[0033] Figure 4 It is a structural schematic diagram of the material throwing head of the present invention;

[0034] Figure 5 It is a schematic diagram of the coaxial reverse transmission mechanism of the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1-Figure 5 As shown, the present invention provides a sand making machine with a double-layer nested crushing chamber structure, including a sand making machine housing 1, a coaxial reversing transmission mechanism 2, a direct-connected driving device 3, a material distribution pile 5 and a crushing device 6; the top of the sand making machine housing 1 is provided with a feeding port 4 as a material entry channel, and the bottom end of the sand making machine housing 1 is provided with a discharging port 8 as a material discharge channel; the coaxial reversing transmission mechanism 2 is provided at the bottom end of the inner part of the sand making machine housing 1, and the direct-connected driving device 3 is provided outside the sand making machine housing 1, and the direct-connected driving device 3 can drive the coaxial reversing transmission mechanism 2 to drive the material distribution pile 5 and the crushing device 6 to move, thereby realizing the crushing and refinement of the material.

[0037] In this embodiment, the direct-connected driving device 3 includes a high-power direct-connected variable-frequency motor 31 and a motor bracket 32 ​​, and the high-power direct-connected variable-frequency motor 31 is fixed to the sand making machine housing 1 through the motor bracket 32 ​​.

[0038] In this embodiment, the crushing device 6 includes a base plate and an annular impact plate 67 arranged on its periphery; an inner ring cavity wall 61 and an outer ring cavity wall 65 are installed on the base plate, the inner ring cavity wall 61 is an arc protruding outward, and the outer surface of the inner ring cavity wall 61 is provided with an inner ring cavity wall impact plate 62; the outer ring cavity wall 65 is an arc protruding outward, and the inner surface of the outer ring cavity wall 65 is provided with an outer ring cavity wall impact plate 64, the annular impact plate 67 is fixed on the sand making machine housing 1, the area between the inner ring cavity wall 61 and the outer ring cavity wall 65 is used as the crushing inner cavity 63, and the area between the outer ring cavity wall 65 and the annular impact plate 67 is used as the crushing outer cavity 66.

[0039] In this embodiment, the coaxial reverse transmission mechanism 2 includes a driving shaft 21, a transmission inner shaft 22, a transmission outer shaft 23, a driving shaft bevel gear 26, a driven outer shaft bevel gear 27, a driven inner shaft bevel gear 28 and a retaining frame 29; the transmission inner shaft 22 is inserted into the transmission outer shaft 23, and the driving shaft 21, the transmission inner shaft 22 and the transmission outer shaft 23 are all provided with movable support by the retaining frame 29, one end of the driving shaft 21 is connected to the output end of the high-power direct-connected frequency conversion motor 31, and the other end of the driving shaft 21 is equipped with a driving shaft bevel gear 26, one end of the transmission inner shaft 22 is equipped with a driven inner shaft bevel gear 28 meshing with the driving shaft bevel gear 26, the other end of the transmission inner shaft 22 is equipped with a material distribution pile 5 and a crushing inner cavity 63, one end of the transmission outer shaft 23 is equipped with a driven outer shaft bevel gear 27 meshing with the driving shaft bevel gear 26, and the other end of the transmission outer shaft 23 is connected to the crushing outer cavity 66.

[0040] In this embodiment, a first connecting member 24 is installed on the transmission inner shaft 22 for connecting with the material distribution pile 5 and the crushing inner chamber 63 , and a second connecting member 25 is installed on the transmission outer shaft 23 for connecting with the crushing outer chamber 66 .

[0041] In this embodiment, a throwing head 7 is provided at the front end of the outer ring cavity wall 65. The throwing head 7 includes a wear-resistant module 71 and a limiting device 72 connected to each other. The wear-resistant module 71 is a detachable structure. A bolt hole 73 matching the outer ring cavity wall 65 is provided at the front end. The wear-resistant module 71 is fixed on the outer ring cavity wall 65.

[0042] In this embodiment, the limiting device 72 is a triangular prism structure. One side of the right-angled surface of the limiting device 72 contacts the outer ring cavity wall 65, and the other side extends toward the inside of the crushing inner cavity 63 at an angle of 30 to 60 degrees.

[0043] In this embodiment, the method for using the sand making machine includes the following steps:

[0044] S1. Feeding: According to the required particle size of the crushed material, select the limit device 72 with different inclination angles of 30-60° and install it at the front end of the throwing head 7. After completion, start the direct drive device 3 to drive the material distribution pile 5, the crushing inner cavity 63 and the crushing outer cavity 66 to rotate simultaneously, and set the appropriate motor 31 speed of 1000-3000r / min according to the material properties, the initial material particle size, and the required finished material particle size to ensure that the required particle size can be obtained after crushing; after the motor 31 is started and reaches the set speed, put the crushed material into the feed port 4;

[0045] S2, Inner cavity crushing: Figure 1 The sand making machine structure diagram of the present invention and Figure 3 As shown in the schematic diagram of the crushing process of the sand making machine of the present invention, the material enters from the feed port 4 and enters the crushing inner cavity 63 under the action of the material distribution pile 5. The crushing inner cavity 63 rotates clockwise, and the material is affected by the clockwise centrifugal force generated by the clockwise rotation of the crushing inner cavity 63. The large-size material moves in a clockwise direction to the central area of ​​the crushing inner cavity 63, and the small-size material moves in a clockwise direction to the outer ring cavity wall impact plate 64, where impact crushing occurs and the material is affected by the counterclockwise centrifugal force generated by the counterclockwise rotation of the crushing outer cavity 66. Most of the material moves in a counterclockwise direction in the outer area of ​​the crushing inner cavity 63, and the material moves in a counterclockwise direction in the outer area of ​​the crushing inner cavity 63. The large-size materials in the center area rotate clockwise and the subsequent materials are crushed by "stone hitting stone". A small part moves counterclockwise to the impact plate 62 of the inner cavity wall, and is impact-crushed again. Under the action of the clockwise centrifugal force generated by the clockwise rotation of the crushing cavity 63, it moves clockwise to the center area of ​​the crushing cavity 63, and is crushed by "stone hitting stone" again with the materials in the center area of ​​the crushing cavity 63. When the material is fully crushed in the crushing cavity 63, the particle size is smaller than the size set by the throwing head limit device 72. Under the action of centrifugal force, the material will pass through the throwing head 7 and enter the crushing outer cavity 66.

[0046] S3. External chamber crushing: After being crushed in the inner chamber, the material enters the crushing outer chamber 66 under the action of centrifugal force. The crushing outer chamber 66 rotates counterclockwise. The material moves to the annular impact plate 67 under the action of the counterclockwise centrifugal force generated by the counterclockwise rotation of the crushing outer chamber 66. After contacting the annular impact plate 67, the material is impact-crushed and further refined, and finally falls under the action of gravity and enters the discharge port 8.

[0047] The relevant specific embodiments of the present invention are as follows:

[0048] Embodiment 1

[0049] This embodiment provides a sand making machine with a double-layer nested crushing chamber structure, such as Figure 1 As shown, the feed port 4 is fixed to the sand making machine housing 1 and is located above the crushing device 6; the crushing device 6 is a double-layer annular structure with a hollow interior;

[0050] like Figure 1 and Figure 2 As shown, the crushing device includes an inner ring cavity wall 61 and an outer ring cavity wall 65, a crushing inner cavity 63 is formed between the inner ring cavity wall 61 and the outer ring cavity wall 65, a crushing outer cavity 66 is formed between the outer ring cavity wall 65 and the annular impact plate 67, an inner ring cavity wall impact plate 62 is provided on the outer surface of the inner ring cavity wall 61, and an outer ring cavity wall impact plate 64 is provided on the inner surface of the outer ring cavity wall 65.

[0051] The double-layer nested crushing chamber structure has multiple crushing modes such as impact crushing and "stone-on-stone" crushing, and multi-stage crushing steps of inner cavity crushing and outer cavity crushing, which greatly increase the probability of materials colliding with each other and significantly improve the crushing efficiency. It can fully crush the materials, effectively refine the particle size of the materials, make the particle size of the finished materials more uniform, and meet higher standard application requirements.

[0052] At the same time, the crushing mode dominated by "stone-on-stone" crushing reduces the impact and wear of materials on the impact plate, extends the service life of the impact plate, reduces the cost of equipment use, and improves the stability of equipment operation.

[0053] like Figure 5 As shown, the transmission mechanism uses a coaxial reverse transmission mechanism 2, the crushing inner chamber rotates clockwise, and the crushing outer chamber rotates counterclockwise. This embodiment uses granite materials with a particle size of 50 to 80 mm, and the speed is set at 1500r / min. Compared with the traditional crushing chamber structure, the output per unit time of the sand making machine of the present invention is increased by 40%, the material particle size is stably controlled below 5mm, and the service life of the annular impact plate is also increased from about 300h of the traditional sand making machine to 450h.

[0054] Embodiment 2

[0055] This embodiment provides a sand making machine with a double-layer nested crushing chamber structure. The basic structure is the same as that of the first embodiment, and the difference and improvement are as follows: Figure 4 As shown, the throwing head 7 includes a wear-resistant module 71 and a limit device 72. The limit device 72 is a triangular prism structure, one side of the right-angled surface is in contact with the outer ring cavity wall 65, and the other side extends into the crushing inner cavity 63 and forms a 60° angle with the outer ring cavity wall 65.

[0056] This embodiment uses granite material with a particle size ranging from 50 to 80 mm, and the rotation speed is set at 1500r / min. Compared with the traditional crushing chamber structure, the output of the sand making machine of this embodiment is increased by 38% per unit time, and the material particle size is stably controlled below 5 mm. The material particle size distribution parameters are D10 between 0.15 and 0.30 mm, D50 between 1.5 and 2.5 mm, and D90 between 4 and 5 mm. The material particle size is mainly distributed in the range of 1.5 to 2.5 mm, and the uniformity is improved. The service life of the annular impact plate is also increased from about 300 hours of the traditional sand making machine to 470 hours.

[0057] Embodiment 3

[0058] This embodiment provides a sand making machine with a double-layer nested crushing chamber structure, and its basic structure is the same as that of the second embodiment.

[0059] This embodiment uses limestone material with a particle size ranging from 50 to 80 mm, and the rotation speed is set at 1800 r / min. Compared with the traditional crushing chamber structure, the output of the sand making machine in this embodiment is increased by 43% per unit time, and the material particle size is stably controlled below 4 mm. The material particle size distribution parameters are D10 between 0.18 and 0.32 mm, D50 between 1.6 and 2.6 mm, and D90 between 4.2 and 5.2 mm. The material particle size is mainly distributed in the range of 1.6 to 2.6 mm.

[0060] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A sand making machine with a double-layer nested crushing chamber structure, characterized in that: The invention comprises a sand making machine housing (1), a coaxial reverse transmission mechanism (2), a direct-connected driving device (3), a material distribution pile (5) and a crushing device (6); the top of the sand making machine housing (1) is provided with a material inlet (4) as a material inlet passage, and the bottom of the sand making machine housing (1) is provided with a material outlet (8) as a material outlet passage; the bottom of the sand making machine housing (1) is provided with a coaxial reverse transmission mechanism (2), and the outside of the sand making machine housing (1) is provided with a direct-connected driving device (3); the direct-connected driving device (3) can drive the coaxial reverse transmission mechanism (2) to drive the material distribution pile (5) and the crushing device (6) to move, thereby achieving material crushing and refining.

2. The sand making machine with a double-layer nested crushing chamber structure according to claim 1 is characterized in that: The direct-connected driving device (3) comprises a high-power direct-connected variable-frequency motor (31) and a motor bracket (32); the high-power direct-connected variable-frequency motor (31) is fixed to the sand making machine housing (1) via the motor bracket (32).

3. The sand making machine with a double-layer nested crushing chamber structure according to claim 2 is characterized in that: The crushing device (6) comprises a base plate and an annular impact plate (67) arranged on the periphery thereof; an inner ring cavity wall (61) and an outer ring cavity wall (65) are installed on the base plate, the inner ring cavity wall (61) is in an arc shape protruding outward, and the outer surface of the inner ring cavity wall (61) is provided with an inner ring cavity wall impact plate (62); the outer ring cavity wall (65) is in an arc shape protruding outward, and the inner surface of the outer ring cavity wall (65) is provided with an outer ring cavity wall impact plate (64), and the annular impact plate (67) is fixed on the sand making machine housing (1), the area between the inner ring cavity wall (61) and the outer ring cavity wall (65) serves as a crushing inner cavity (63), and the area between the outer ring cavity wall (65) and the annular impact plate (67) serves as a crushing outer cavity (66).

4. The sand making machine with a double-layer nested crushing chamber structure according to claim 3 is characterized in that: The coaxial counter-rotating transmission mechanism (2) comprises a driving shaft (21), a transmission inner shaft (22), a transmission outer shaft (23), a driving shaft bevel gear (26), a driven outer shaft bevel gear (27), a driven inner shaft bevel gear (28) and a retaining frame (29); the transmission inner shaft (22) is inserted into the transmission outer shaft (23); the driving shaft (21), the transmission inner shaft (22) and the transmission outer shaft (23) are all movably supported by the retaining frame (29); one end of the driving shaft (21) is connected to the high-power direct-connected variable frequency motor (31). The output end is connected, the other end of the driving shaft (21) is equipped with a driving shaft bevel gear (26), one end of the transmission inner shaft (22) is equipped with a driven inner shaft bevel gear (28) meshing with the driving shaft bevel gear (26), the other end of the transmission inner shaft (22) is equipped with a material distribution pile (5) and a crushing inner cavity (63), one end of the transmission outer shaft (23) is equipped with a driven outer shaft bevel gear (27) meshing with the driving shaft bevel gear (26), and the other end of the transmission outer shaft (23) is connected to the crushing outer cavity (66).

5. The sand making machine with a double-layer nested crushing chamber structure according to claim 4 is characterized in that: The transmission inner shaft (22) is provided with a first connecting piece (24) for connecting to the material distribution pile (5) and the crushing inner chamber (63), and the transmission outer shaft (23) is provided with a second connecting piece (25) for connecting to the crushing outer chamber (66).

6. The sand making machine with a double-layer nested crushing chamber structure according to claim 5 is characterized in that: A throwing head (7) is provided at the front end of the outer ring cavity wall (65), and the throwing head (7) includes a wear-resistant module (71) and a limiting device (72) connected to each other. The wear-resistant module (71) is a detachable structure, and a bolt hole (73) adapted to the outer ring cavity wall (65) is provided at the front end. The wear-resistant module (71) is fixed on the outer ring cavity wall (65).

7. The sand making machine with a double-layer nested crushing chamber structure according to claim 6 is characterized in that: The limiting device (72) is a triangular prism structure, one side of the right-angled surface of the limiting device (72) contacts the outer ring cavity wall (65), and the other side extends toward the inside of the crushing inner cavity (63) at an angle of 30 to 60 degrees.

8. The sand making machine with a double-layer nested crushing chamber structure according to claim 7 is characterized in that: The use of the sand making machine includes the following steps: S1. Feeding: According to the required particle size of the crushed material, a stopper (72) with different inclination angles is selected and installed at the front end of the throwing head (7). After completion, the direct drive device (3) is started to drive the material distribution pile (5), the crushing inner chamber (63) and the crushing outer chamber (66) to rotate simultaneously, and the appropriate motor (31) speed is set according to the material properties, the initial material particle size, and the required finished material particle size to ensure that the required particle size can be obtained after crushing; after the motor (31) is started and reaches the set speed, the crushed material is placed in the feed port (4); S2. Inner cavity crushing: the material enters from the feed port (4) and enters the crushing inner cavity (63) under the action of the material distribution pile (5). The crushing inner cavity (63) rotates clockwise. The material is affected by the clockwise centrifugal force generated by the clockwise rotation of the crushing inner cavity (63). The large-sized material moves in the clockwise direction to the center area of ​​the crushing inner cavity (63), and the small-sized material moves in the clockwise direction to the outer cavity wall impact plate (64). Impact crushing occurs and the material is affected by the counterclockwise centrifugal force generated by the counterclockwise rotation of the crushing outer cavity (66). Most of the material moves in the counterclockwise direction in the outer area of ​​the crushing inner cavity (63), and the material moves in the counterclockwise direction in the outer area of ​​the crushing inner cavity (63). The large-size materials rotating clockwise in the region and the subsequent materials are crushed by "stone hitting stone". A small part moves in the counterclockwise direction to the impact plate (62) of the inner cavity wall, is impact-crushed again, and is affected by the clockwise centrifugal force generated by the clockwise rotation of the crushing cavity (63). It moves in the clockwise direction to the center area of ​​the crushing cavity (63) and is crushed by "stone hitting stone" again with the materials in the center area of ​​the crushing cavity (63). When the materials are fully crushed in the crushing cavity (63), the particle size is smaller than the size set by the throwing head limit device (72). Under the action of centrifugal force, the materials will pass through the throwing head (7) and enter the crushing outer cavity (66). S3, external chamber crushing: after being crushed in the internal chamber, the material enters the crushing external chamber (66) under the action of centrifugal force. The crushing external chamber (66) rotates counterclockwise. The material moves to the annular impact plate (67) under the action of the counterclockwise centrifugal force generated by the counterclockwise rotation of the crushing external chamber (66). After contacting the annular impact plate (67), the material is impact crushed and further refined. Finally, the material falls under the action of gravity and enters the discharge port (8).

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