A multi-stage circulating grinding equipment for graphite materials

Abstract

This utility model discloses a multi-stage circulating grinding equipment for graphite materials, comprising a housing, multiple crushing mechanisms, multiple pushing mechanisms, multiple airflow circulation conveying pipes, and multiple negative pressure mechanisms. The housing contains multiple grinding chambers, with any two adjacent chambers separated by a vibrating screen. Multiple airflow circulation conveying pipes are respectively arranged corresponding to the grinding chambers, with their inlets connected to the bottom and outlets connected to the top. Multiple crushing mechanisms are respectively disposed within the grinding chambers. Multiple pushing mechanisms are respectively disposed above one side of the vibrating screens, pushing residual material on the screens to the corresponding airflow circulation conveying pipes. Multiple negative pressure mechanisms are used to extract air from the airflow circulation pipes to create negative pressure within them. This utility model can effectively improve product quality and yield, and enhance economic efficiency.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a multi-stage circulating grinding equipment for graphite materials. Background Technology

[0002] Artificial graphite, with its excellent cycle performance, high-rate charge-discharge efficiency, and electrolyte compatibility, is widely used in automotive power batteries and mid-to-high-end electronic products. In recent years, with the increasing demands for range in automotive power batteries and mid-to-high-end electronic products, and the rapid development of the lithium battery industry, the demand for high-capacity artificial graphite anode materials has increased dramatically. Research on processes to improve the production capacity and reduce energy consumption of artificial graphite materials has become a hot topic.

[0003] Crushing and grinding are indispensable and precisely controlled processes in the production of artificial graphite, directly affecting the key performance indicators (energy density, fast-charging capability, cycle life, processing performance, etc.) and cost of the final product. Current graphite grinding equipment suffers from low yields of qualified products, some materials cannot be recycled, and the equipment occupies a large area. Utility Model Content

[0004] Based on this, the purpose of this utility model is to provide a multi-stage circulating grinding equipment for graphite materials, which combines primary crushing, roller milling, and grinding disc grinding, and is equipped with a multi-stage circulating conveying mechanism, which can effectively improve product yield while ensuring grinding efficiency and quality.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a multi-stage circulating grinding equipment for graphite materials, which includes an equipment box, multiple crushing mechanisms, multiple pushing mechanisms, multiple airflow circulation conveying pipes, and multiple negative pressure mechanisms.

[0007] The equipment housing has multiple grinding chambers arranged sequentially from top to bottom, and any two adjacent grinding chambers are isolated by a vibrating screen;

[0008] Multiple airflow circulation conveying pipes are installed on the equipment housing and are respectively set to correspond to multiple grinding chambers. The inlet of the airflow circulation conveying pipe is connected to the bottom of the corresponding grinding chamber and its outlet is connected to the top of the corresponding grinding chamber.

[0009] Multiple crushing mechanisms are respectively installed in multiple grinding chambers and located below the discharge port of the airflow circulation conveying pipeline;

[0010] Multiple pushing mechanisms are respectively set on one side above multiple vibrating screens. The pushing mechanisms are used to push the material remaining on the vibrating screens to the corresponding airflow circulation conveying pipes.

[0011] Multiple negative pressure mechanisms are used to draw air from multiple airflow circulation pipes to generate negative pressure in the airflow circulation delivery pipes.

[0012] As a further improvement of the above-mentioned solution of this utility model, the equipment box has three grinding chambers, which are respectively defined as a primary grinding chamber, a secondary grinding chamber, and a tertiary grinding chamber. The equipment box also has a collection chamber located below the tertiary grinding chamber, and the collection chamber is isolated from the tertiary grinding chamber by a vibrating screen. The primary grinding chamber has a raw material inlet at the top and the collection chamber has a product outlet at the bottom. Multiple crushing mechanisms are respectively defined as a primary crushing mechanism, a secondary crushing mechanism, and a tertiary crushing mechanism, which are respectively installed in the primary grinding chamber, the secondary grinding chamber, and the tertiary grinding chamber.

[0013] As a further improvement of the above-mentioned solution of this utility model, the primary crushing mechanism includes a fixed crushing jaw plate, a movable crushing jaw plate, and a driver; the fixed crushing jaw plate is fixed to one side of the inner wall of the primary grinding chamber; the movable crushing jaw plate is arranged opposite to the fixed crushing jaw plate and a crushing gap is formed between the movable crushing jaw plate and the fixed crushing jaw plate, the top of the movable crushing jaw plate is rotatably connected to the inner wall of the primary grinding chamber and its other end is a free end; the driver is installed on the equipment housing, and the movable crushing jaw plate is driven by the driver to generate crushing motion.

[0014] As a further improvement of the above-mentioned solution of this utility model, the secondary crushing mechanism includes two motors, two crushing shafts and two toothed rollers. The two motors are all mounted on the equipment housing. The two crushing shafts are horizontally arranged opposite each other in the secondary grinding chamber and are respectively connected to the output shafts of the two motors. The two toothed rollers are respectively mounted on the two crushing shafts and the two toothed rollers mesh with each other, forming a crushing gap between the two toothed rollers.

[0015] As a further improvement of the above-mentioned solution of this utility model, the secondary crushing mechanism also includes two motors and two grinding rollers. The two motors are both installed on the equipment housing, and the two grinding rollers are respectively arranged below the two toothed rollers and are respectively connected to the output shafts of the two motors. The two grinding rollers are horizontally opposite each other and a grinding gap is formed between them.

[0016] As a further improvement of the above-mentioned solution of this utility model, the secondary crushing mechanism also includes two guide plates one and two guide plates two. The two guide plates one are distributed in an inverted V-shape and are respectively arranged above the two toothed rollers. The two guide plates one are installed on the inner wall of the secondary grinding chamber. The two guide plates two are distributed in an inverted V-shape and are respectively arranged above the two grinding rollers. The two guide plates two are installed on the inner wall of the secondary grinding chamber.

[0017] As a further improvement of the above-mentioned solution of this utility model, the three-stage crushing mechanism includes a grinding disc, several grinding rollers, several motors, and several conveying components; the grinding disc is horizontally arranged in the three-stage grinding chamber, and a discharge port is opened through the middle of the grinding disc; the power unit is installed on the equipment housing and is used to drive the grinding disc to rotate; several grinding rollers are circumferentially distributed above the grinding disc, and the axial direction of the grinding rollers is consistent with the radial direction of the grinding disc, forming a grinding gap between the grinding rollers and the grinding disc; several motors are all installed on the equipment housing, and several grinding rollers are respectively connected to the output shafts of several motors; at least one of the conveying components is provided between any two adjacent grinding rollers, and the conveying components are used to transport the material on the grinding disc to the discharge port in the middle of the grinding disc.

[0018] As a further improvement of the above-mentioned solution of this utility model, the conveying component includes a baffle, a mounting plate, a conveyor belt, two conveyor rollers, and a motor. The baffle is arranged radially along the grinding disc and fixed on the inner wall of the equipment box. The mounting plate is arranged parallel to one side of the baffle, with one end extending into the upper part of the discharge port. The mounting plate is connected to the baffle by several support rods and a gap is left between them. A scraping plate is arranged radially along the grinding disc at the bottom of the mounting plate, and the scraping plate has an inclined surface on the side away from the mounting plate. The two conveyor rollers are respectively vertically rotated and installed at both ends of the mounting plate. The conveyor belt is fitted onto the two conveyor rollers. The motor is installed on the inner wall of the equipment box and is connected to one of the conveyor rollers for transmission.

[0019] As a further improvement of the above-mentioned solution of this utility model, a pushing mechanism is also installed on one side of the bottom of the collection chamber, and the pushing mechanism is used to push the material accumulated at the bottom of the collection chamber to the product outlet; the pushing mechanism includes a scraper and a driving cylinder; the scraper is set above the vibrating screen, and slide rails are installed on both ends of the inner wall of the grinding chamber at the two ends of the scraper, and the two ends of the scraper are respectively connected to the sliders of the two slide rails; a baffle is installed on the inner wall of the grinding chamber above the slide rails; the driving cylinder is installed on the equipment housing and its telescopic end is connected to the scraper.

[0020] As a further improvement to the above-mentioned solution of this utility model, the aperture of the multiple vibrating screens decreases sequentially from top to bottom.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This invention achieves multi-stage crushing of materials by setting up multiple grinding chambers and setting up crushing mechanisms in each grinding chamber. At the same time, multiple vibrating screens are set up to screen the materials crushed by each crushing mechanism, and finally collect qualified materials. Unqualified materials remaining on the vibrating screens are transported again to the corresponding crushing mechanism for re-crushing through airflow circulation pipeline, negative pressure mechanism and pushing mechanism, and repeated crushing / grinding, which can effectively improve product quality and yield, and improve economic efficiency.

[0023] This invention integrates crushing and grinding processes, cleverly utilizing vertical space for a gradient distribution, effectively reducing the equipment's footprint and eliminating the need for complex conveying pipelines to facilitate material flow. Simultaneously, the three-stage vibrating screening system, combined with a three-stage circulating conveying pipeline design, allows for the recirculation and further crushing of substandard materials from each stage, effectively increasing the yield of qualified products. Furthermore, with integrated intelligent control, the system significantly improves the equipment's coordinated production efficiency and control precision, enhancing product quality consistency, increasing economic efficiency, and ensuring the company's competitiveness in the industry. Attached Figure Description

[0024] Figure 1 A schematic diagram of the structure of a multi-stage circulating grinding equipment for graphite materials provided in this embodiment of the present invention;

[0025] Figure 2 A perspective view of a multi-stage circulating grinding equipment for graphite materials provided in an embodiment of this utility model;

[0026] Figure 3 A partial structural schematic diagram of a multi-stage circulating grinding equipment for graphite materials provided in this embodiment of the present invention;

[0027] Figure 4 A schematic diagram of the conveying component in a multi-stage circulating grinding equipment for graphite materials, provided as an embodiment of this utility model;

[0028] Figure 5 A schematic diagram illustrating the working principle of a three-stage crushing mechanism in a multi-stage circulating grinding equipment for graphite materials, provided as an embodiment of this utility model.

[0029] Attached reference numerals: 1. Equipment housing; 11. Raw material inlet; 12. Product outlet; 9. Pushing mechanism; 91. Scraper; 92. Slide rail; 93. Baffle plate; 94. Drive cylinder; 3. Airflow circulation conveying pipeline; 4. Negative pressure mechanism; 5. Vibrating screen; 6. Primary crushing mechanism; 61. Fixed crushing jaw plate; 62. Movable crushing jaw plate; 63. Driver; 7. Secondary crushing mechanism; 71. Toothed roller; 72. Grinding roller; 73. Guide plate one; 74. Guide plate two; 8. Tertiary crushing mechanism; 81. Grinding disc; 82. Grinding roller; 83. Baffle plate; 84. Mounting plate; 85. Conveyor belt; 86. Motor four; 87. Shovel plate; 88. Scraper; 89. Support. Detailed Implementation

[0030] To facilitate understanding of this invention, a more comprehensive description of the invention will be provided below with reference to specific embodiments. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of this invention.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0032] Reference Figure 1 , Figure 2 This embodiment proposes a multi-stage circulating grinding equipment for graphite materials, which includes an equipment housing 1, three crushing mechanisms, four pushing mechanisms 9, three airflow circulating conveying pipes 3 and three negative pressure mechanisms 4.

[0033] The equipment housing 1 has three grinding chambers, defined as a primary grinding chamber, a secondary grinding chamber, and a tertiary grinding chamber. A raw material inlet 11 is located at the top of the primary grinding chamber, where a feeding funnel can be installed. The primary and secondary grinding chambers, as well as the secondary and tertiary grinding chambers, are isolated by vibrating screens 5. The equipment housing 1 also has a collection chamber located below the tertiary grinding chamber, isolated from it by vibrating screens 5. A product outlet 12 is located on one side of the bottom of the collection chamber. From top to bottom, the aperture diameter of the multiple vibrating screens 5 decreases sequentially. In this embodiment, the vibrating screens 5 employ existing technology, which will not be elaborated upon here. They utilize the periodic excitation force generated by the vibrator to cause the screen box to drive the screen mesh to vibrate at high frequency. The material is thrown up and stratified on the screen surface, allowing particles smaller than the screen apertures to pass through, thereby achieving material grading.

[0034] The multiple crushing mechanisms are defined as primary crushing mechanism 6, secondary crushing mechanism 7, and tertiary crushing mechanism 8, respectively. Primary crushing mechanism 6, secondary crushing mechanism 7, and tertiary crushing mechanism 8 are respectively installed in the primary grinding chamber, secondary grinding chamber, and tertiary grinding chamber.

[0035] The primary crushing mechanism 6 adopts an existing jaw crusher mechanism, mainly including a fixed jaw plate 61, a movable jaw plate 62, and a driver 63. The fixed jaw plate 61 is fixed to one side of the inner wall of the primary grinding chamber. The movable jaw plate 62 is arranged opposite to the fixed jaw plate 61, and a crushing gap is formed between the movable jaw plate 62 and the fixed jaw plate 61. The top of the movable jaw plate 62 is rotatably connected to the inner wall of the primary grinding chamber, and its other end is a free end. The driver 63 is mounted on the equipment housing 1, and the movable jaw plate 62 is driven by the driver 63 to generate crushing motion. In this embodiment, the driver 63 is a hydraulic cylinder, and the piston rod of the hydraulic cylinder is rotatably connected to the movable jaw plate 62.

[0036] Combination Figure 3 The secondary crushing mechanism 7 adopts a combination of a double-toothed roller crusher groove and a double-roller grinding mechanism, mainly including two motors (not shown), two crushing shafts (not shown), two toothed rollers 71, two motors (not shown), two grinding rollers 72, two guide plates 73, and two guide plates 74. Both motors are mounted on the equipment housing 1. The two crushing shafts are horizontally opposite each other within the secondary grinding chamber, and each shaft is connected to the output shaft of one motor. The two toothed rollers 71 are respectively fitted onto the two crushing shafts and mesh, forming a crushing gap between them. Both motors are mounted on the equipment housing 1. The two grinding rollers 72 are respectively positioned below the two toothed rollers 71 and are connected to the output shaft of the other motor, forming a grinding gap between them. Two guide plates 73 are arranged in an inverted V-shape and positioned above the two toothed rollers 71. These guide plates 73 are installed on the inner wall of the secondary grinding chamber. Under the action of the two guide plates 73, material falling from above can be concentrated and enter the crushing gap between the two toothed rollers 71. Two guide plates 74 are also arranged in an inverted V-shape and positioned above the two grinding rollers 72. These guide plates 74 are installed on the inner wall of the secondary grinding chamber. Under the action of the two guide plates 74, material falling from above can be concentrated and enter the grinding gap between the two grinding rollers 72.

[0037] The three-stage crushing mechanism 8 adopts a disc crushing mechanism, mainly including a grinding disc 81, a power unit (not shown), several grinding rollers 82, several motors (not shown), and several conveying components. The grinding disc 81 is horizontally arranged in the three-stage grinding chamber, with a discharge port extending through the center of the grinding disc 81. The power unit includes a motor and a hollow reducer. The hollow reducer is installed in the three-stage grinding chamber, and the grinding disc 81 is installed at the output end of the hollow reducer. The output end of the motor is connected to the input end of the hollow reducer. Several grinding rollers 82 are circumferentially distributed above the grinding disc 81, with the axial direction of the grinding rollers 82 aligned with the radial direction of the grinding disc 81, forming a grinding gap between the grinding rollers 82 and the grinding disc 81. Several motors are mounted on the equipment housing 1, and the grinding rollers 82 are respectively connected to the output shafts of the motors. A conveying component is provided between any two adjacent grinding rollers 82 to transport the material on the grinding disc 81 to the discharge port in the center of the grinding disc 81.

[0038] In this embodiment, combined with Figure 4 The conveying components include a baffle 83, a mounting plate 84, a conveyor belt 85, two conveyor rollers, a motor 86, and a scraper 88. The baffle 83 is arranged radially along the grinding disc 81 and fixed to the inner wall of the equipment housing 1. The mounting plate 84 is parallel to one side of the baffle 83, with one end extending above the discharge port. The mounting plate 84 is connected to the baffle plate 23 by several support rods, leaving a gap between it and the baffle 83. A scraper plate 87, arranged radially along the grinding disc 81, is provided on the bottom facing surface of the mounting plate 84. The scraper plate 87 has an inclined surface on the side away from the mounting plate 84. The two conveyor rollers are vertically rotatably mounted at both ends of the mounting plate 84. The conveyor belt 85 is fitted onto the two conveyor rollers. The motor 86 is mounted on the inner wall of the equipment housing 1 and is connected to one of the conveyor rollers. Furthermore, to avoid material residue on the conveyor belt, a scraper 87 is installed at one end of the mounting plate 86 near the discharge port. The scraper 87 is vertically arranged and fixed on the mounting plate 84. The scraper 87 is in clearance fit with the conveyor belt 85. During the rotation of the conveyor belt 85, the scraper 87 can scrape off the material on the surface of the conveyor belt 85.

[0039] Three airflow circulation conveying pipes 3 are installed on the equipment housing 1, and the three airflow circulation conveying pipes 3 are respectively set to correspond to the first-stage grinding chamber, the second-stage grinding chamber, and the third-stage grinding chamber. The inlet of the airflow circulation conveying pipe 3 is connected to the bottom of the corresponding grinding chamber, and its outlet is connected to the top of the corresponding grinding chamber.

[0040] Each vibrating screen 5 has a pushing mechanism 9 on one side above it. The pushing mechanism 9 is used to push the material remaining on the corresponding vibrating screen 5 to the corresponding airflow circulation conveying pipe. A pushing mechanism 9 is also provided at the bottom of the collection chamber. This pushing mechanism 9 is positioned opposite to the product outlet 12, so that the product accumulated at the bottom of the collection chamber can be pushed to the product outlet 12 for discharge. In this embodiment, the pushing mechanism 9 includes a scraper 91 and a drive cylinder 94. The scraper 91 is positioned above the vibrating screen 5. Slide rails 92 are installed at both ends of the inner wall of the grinding chamber at the scraper 91. The two ends of the scraper 91 are respectively connected to the sliders of the two slide rails 92. A baffle plate 93 is installed above the slide rails 92 on the inner wall of the grinding chamber. The drive cylinder 94 is mounted on the equipment housing 1 and its telescopic end is connected to the scraper 91.

[0041] Three negative pressure mechanisms 4 are used to extract air from the airflow circulation pipes 3 to generate negative pressure within the airflow circulation delivery pipes 3. In this embodiment, the negative pressure mechanism 4 is a fan.

[0042] The working principle of this embodiment will now be explained in detail.

[0043] Large pieces of material enter the primary grinding chamber through the feeding hopper. The movable crushing jaw plate 62 generates crushing motion under the drive of the driver 63, crushing the material into small pieces. The vibrating screen 5 screens the material crushed in the primary stage (vibration function is always on). Unqualified materials will remain on the vibrating screen 5, and qualified materials will enter the secondary crushing chamber through the vibrating screen 5.

[0044] In the secondary grinding chamber, small pieces of material are first crushed into small particles by the action of two toothed rollers 71, and then enter the grinding gap between two grinding rollers 72. Under the action of the two grinding rollers 72, they are initially ground into fine powder. Then, the vibrating screen 5 screens the fine powder (vibration function is always on). Unqualified materials remain on the vibrating screen 5, and qualified materials pass through the vibrating screen 5 and enter the tertiary grinding chamber.

[0045] In the three-stage grinding chamber, fine powder enters the grinding disc 81 area. The grinding disc 81 rotates slowly circumferentially, and the motor drives the grinding roller 82 to rotate, grinding the material on the grinding disc 81 into ultrafine powder. As the grinding disc 81 rotates, it carries the ground material to the conveyor position. Under the action of the shovel plate 87, the material accumulates in large quantities at the bottom of the mounting plate 84. The motor 86 starts, driving the conveyor belt 85 to rotate. The direction of rotation of the conveyor belt 85 is the same as that of the grinding disc 81. Figure 5 As shown, the conveyor belt 85 will transport the material to the discharge port in the center of the grinding disc 81. The material flows downward through the discharge port. The vibrating screen 5 below the three-stage crushing mechanism 8 screens the ultrafine powder (vibration function is always on). Unqualified materials stay on the vibrating screen 5, and qualified materials enter the collection chamber through the vibrating screen 5.

[0046] After entering the collection chamber, the ultrafine powder accumulates at the bottom of the collection chamber and is pushed to the product outlet 12 for discharge by the pushing mechanism 9 inside the collection chamber;

[0047] Since unqualified materials remain on the vibrating screen 5, the pushing mechanism 9 pushes the materials remaining on the vibrating screen 5 into the corresponding airflow circulation conveying pipe 3. Then, the negative pressure mechanism 4 is activated, and the materials float and move upward with the airflow in the airflow circulation conveying pipe 3. In this way, the unqualified materials at the bottom of the primary grinding chamber are conveyed to the top of the primary crushing mechanism 6, where they are crushed again. This cycle continues until the materials pass through the vibrating screen 5 below the primary crushing mechanism 6. Similarly, the unqualified materials at the bottom of the secondary grinding chamber are conveyed to the top of the secondary crushing mechanism 7, where they are crushed again. This cycle continues until the materials pass through the vibrating screen 5 below the secondary crushing mechanism 7. The unqualified materials at the bottom of the tertiary grinding chamber are also conveyed to the top of the tertiary crushing mechanism 8, where they are crushed again. This cycle continues until the materials pass through the vibrating screen 5 below the tertiary crushing mechanism 8. Here, the pushing mechanism and the negative pressure mechanism are activated intermittently to avoid affecting the normal crushing and grinding of the materials.

[0048] The multi-stage circulating grinding equipment in this embodiment combines primary crushing, roller milling, and disc grinding, and is equipped with a multi-stage circulating conveying mechanism. This can effectively improve product yield while ensuring grinding efficiency and quality. The highly integrated design effectively reduces the equipment footprint, improves linkage efficiency, and enhances economic efficiency.

[0049] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A multi-stage circulating grinding equipment for graphite materials, characterized in that, It includes an equipment housing (1), multiple crushing mechanisms, multiple pushing mechanisms (9), multiple airflow circulation conveying pipes (3), and multiple negative pressure mechanisms (4); The equipment housing (1) has multiple grinding chambers arranged sequentially from top to bottom, and any two adjacent grinding chambers are isolated by a vibrating screen (5); Multiple airflow circulation conveying pipes (3) are installed on the equipment box (1) and multiple airflow circulation conveying pipes (3) are respectively set with multiple grinding chambers. The inlet of the airflow circulation conveying pipe (3) is connected to the bottom of the corresponding grinding chamber and its outlet is connected to the top of the corresponding grinding chamber. The multiple crushing mechanisms are respectively arranged in the multiple grinding chambers and located below the discharge port of the airflow circulation conveying pipe (3); Multiple pushing mechanisms (9) are respectively set on one side above multiple vibrating screens (5). The pushing mechanism (9) is used to push the material remaining on the vibrating screen (5) to the corresponding airflow circulation conveying pipe (3). Multiple negative pressure mechanisms (4) are used to generate negative pressure in multiple airflow circulation conveying pipes (3) to generate negative pressure in the airflow circulation conveying pipes (3).

2. The multi-stage circulating grinding equipment for graphite materials according to claim 1, characterized in that, The equipment housing (1) has three grinding chambers, which are defined as the first-stage grinding chamber, the second-stage grinding chamber and the third-stage grinding chamber respectively. The equipment housing (1) also has a collection chamber located below the third-stage grinding chamber and the collection chamber is isolated from the third-stage grinding chamber by a vibrating screen (5). The first-stage grinding chamber is provided with a raw material inlet (11) at the top and a product outlet (12) at the bottom of the collection chamber. Multiple crushing mechanisms are defined as the first-stage crushing mechanism (6), the second-stage crushing mechanism (7) and the third-stage crushing mechanism (8) respectively. The first-stage crushing mechanism (6), the second-stage crushing mechanism (7) and the third-stage crushing mechanism (8) are respectively set in the first-stage grinding chamber, the second-stage grinding chamber and the third-stage grinding chamber.

3. The multi-stage circulating grinding equipment for graphite materials according to claim 2, characterized in that, The primary crushing mechanism (6) includes a fixed crushing jaw plate (61), a movable crushing jaw plate (62), and a driver (63); the fixed crushing jaw plate (61) is fixed to one side of the inner wall of the primary grinding chamber; the movable crushing jaw plate (62) is arranged opposite to the fixed crushing jaw plate (61) and a crushing gap is formed between the movable crushing jaw plate (62) and the fixed crushing jaw plate (61); the top of the movable crushing jaw plate (62) is rotatably connected to the inner wall of the primary grinding chamber and its other end is a free end; the driver (63) is installed on the equipment housing (1), and the movable crushing jaw plate (62) is driven by the driver (63) to generate crushing motion.

4. The multi-stage circulating grinding equipment for graphite materials according to claim 2, characterized in that, The secondary crushing mechanism (7) includes two motors, two crushing shafts and two toothed rollers (71). The two motors are mounted on the equipment housing (1). The two crushing shafts are horizontally opposite each other in the secondary grinding chamber and are respectively connected to the output shafts of the two motors. The two toothed rollers (71) are respectively mounted on the two crushing shafts and mesh with each other, forming a crushing gap between the two toothed rollers (71).

5. The multi-stage circulating grinding equipment for graphite materials according to claim 4, characterized in that, The secondary crushing mechanism (7) also includes two motors and two grinding rollers (72). The two motors are installed on the equipment housing (1). The two grinding rollers (72) are respectively located below the two toothed rollers (71) and are respectively connected to the output shafts of the two motors. The two grinding rollers (72) are horizontally opposite each other and form a grinding gap between them.

6. The multi-stage circulating grinding equipment for graphite materials according to claim 4, characterized in that, The secondary crushing mechanism (7) also includes two guide plates (73) and two guide plates (74). The two guide plates (73) are arranged in an inverted V-shape and are respectively set above the two toothed rollers (71). The two guide plates (73) are installed on the inner wall of the secondary grinding chamber. The two guide plates (74) are arranged in an inverted V-shape and are respectively set above the two grinding rollers (72). The two guide plates (74) are installed on the inner wall of the secondary grinding chamber.

7. The multi-stage circulating grinding equipment for graphite materials according to claim 2, characterized in that, The three-stage crushing mechanism (8) includes a grinding disc (81), a power unit, several grinding rollers (82), several motors, and several conveying components. The grinding disc (81) is horizontally arranged in the three-stage grinding chamber, and a discharge port is opened through the middle of the grinding disc (81). The power unit is installed on the equipment housing (1) and is used to drive the grinding disc (81) to rotate. Several grinding rollers (82) are circumferentially distributed above the grinding disc (81), and the axial direction of the grinding rollers (82) is consistent with the radial direction of the grinding disc (81). A grinding gap is formed between the grinding rollers (82) and the grinding disc (81). Several motors are installed on the equipment housing (1), and several grinding rollers (82) are respectively connected to the output shafts of several motors. At least one conveying component is provided between any two adjacent grinding rollers (82). The conveying component is installed on the inner wall of the equipment housing (1) and is used to convey the material on the grinding disc (81) to the discharge port in the middle of the grinding disc (81).

8. The multi-stage circulating grinding equipment for graphite materials according to claim 7, characterized in that, The conveying components include a baffle (83), a mounting plate (84), a conveyor belt (85), two conveyor rollers, and a motor (86). The baffle (83) is arranged radially along the grinding disc (81) and fixed on the inner wall of the equipment housing (1). The mounting plate (84) is arranged parallel to one side of the baffle (83) and one end of it extends into the upper part of the discharge port. The mounting plate (84) is connected to the baffle (83) by several support rods and has a gap between it and the baffle (83). The bottom of the mounting plate (84) is provided with a scraper plate (87) arranged radially along the grinding disc (81), and the scraper plate (87) has an inclined surface on the side away from the mounting plate (84). The two conveyor rollers are respectively vertically rotated and installed at both ends of the mounting plate (84). The conveyor belt (85) is fitted on the two conveyor rollers. The motor (86) is installed on the inner wall of the equipment housing (1) and is connected to one of the conveyor rollers.

9. The multi-stage circulating grinding equipment for graphite materials according to claim 2, characterized in that, A pushing mechanism (9) is also installed on one side of the bottom of the collection chamber, and the pushing mechanism (9) is used to push the material accumulated at the bottom of the collection chamber to the product outlet (12); the pushing mechanism (9) includes a scraper (91) and a driving cylinder (94); the scraper (91) is set above the vibrating screen (5), and the inner wall of the grinding chamber is equipped with slide rails (92) at both ends of the scraper (91), and the two ends of the scraper (91) are respectively connected to the sliders of the two slide rails (92), and the inner wall of the grinding chamber is equipped with a baffle plate (93) above the slide rails (92); the driving cylinder (94) is installed on the equipment box (1) and its extension end is connected to the scraper (91).

10. The multi-stage circulating grinding equipment for graphite materials according to claim 1, characterized in that, From top to bottom, the aperture diameter of the multiple vibrating screens (5) decreases sequentially.

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