Industrial fused salt material grinding device

By designing a molten salt material grinding device that includes a feeding hopper, crushing hopper, screw feeder, grinding hopper, and receiving hopper, and combining crushing components, grinding components, and scraping components, the problem of unstable molten salt grinding quality in existing devices has been solved. Automatic screening and secondary grinding of molten salt particle size has been achieved, improving the stability and consistency of production.

CN223788616UActive Publication Date: 2026-01-13SHANXI DADI ECOLOGICAL ENVIRONMENT TECHNOLOGY RESEARCH INSTITUTE CO LTD
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Patent Information

Application Number
CN202520036481.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-12-17
Publication Date
2026-01-13
Estimated Expiration
2035-12-17

AI Technical Summary

Technical Problem

Existing grinding equipment cannot guarantee the stability and consistency of grinding quality of molten salt materials, especially the uniformity of particle size.

Method used

A molten salt material grinding device was designed, comprising a feeding hopper, a screw feeder, a crushing hopper, a screw feeder, a grinding hopper, and a receiving hopper. The device includes crushing and grinding components, uses a screen plate for sieving, and a scraping component to achieve automatic secondary grinding of molten salt particles. This ensures that particles with the correct particle size enter the receiving hopper, while other particles are returned to the feeding hopper through the secondary grinding return port.

Benefits of technology

This improves the stability and consistency of grinding quality of molten salt materials, ensuring that molten salt particles with the correct particle size enter the receiving hopper, while particles with the incorrect particle size are automatically returned to the feeding hopper for secondary grinding, thus realizing automated control and efficient production of molten salt products.

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Abstract

The utility model belongs to the technical field of fused salt material grinding, and particularly relates to an industrial fused salt material grinding device which comprises a feeding bin, a screw feeding machine, a crushing bin, a screw feeder, a grinding bin and a receiving bin, the feeding bin is provided with a feeding port and a secondary grinding return port, the feeding bin is connected with the screw feeding machine through the screw feeding machine, and the crushing bin is connected with the screw feeder through the screw feeding machine. A feeding port of the feeding bin is communicated with the bottom end of the threaded feeding machine, the crushing bin is connected with the grinding bin through the threaded feeding machine, the bottom end of the grinding bin is communicated with the top end of the material receiving bin, a material receiving bin access hole and a discharging port are formed in the bottom of the material receiving bin, and the secondary grinding material returning port is communicated with the material receiving bin. The automatic secondary grinding device has the advantages of being reasonable in arrangement and convenient to use, ground fused salt particles are screened through the screening disc, stability and consistency of grinding quality are improved, the fused salt particles with unqualified particle sizes are scraped and swept to the feeding bin through the scraping and sweeping assembly, automatic secondary grinding of fused salt products is achieved, and the grinding effect is improved.
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Description

Technical Field

[0001] This utility model relates to the field of molten salt material grinding technology; specifically, this utility model relates to an industrial molten salt material grinding device. Background Technology

[0002] Concentrated solar thermal molten salt energy storage is a crucial support for the efficient utilization of renewable energy and an inevitable trend in the development of energy storage and concentrated solar power technologies. For molten salt manufacturers, producing products that meet all required specifications is paramount. Particle size is a physical property of molten salt; qualified molten salt products have uniform particle size. Existing grinding equipment often struggles to guarantee the stability and consistency of grinding quality when grinding molten salt materials. Utility Model Content

[0003] In view of this, the present invention provides an industrial molten salt material grinding device, thereby solving or at least alleviating the above-mentioned problems existing in the prior art.

[0004] To achieve the aforementioned objectives, this utility model provides an industrial molten salt material grinding device, comprising: a feeding bin, a screw feeder, a crushing bin, a screw feeder, a grinding bin, and a receiving bin. The feeding bin is provided with a feeding port and a secondary grinding return port. The feeding bin is connected to the screw feeder via the screw feeder, and the feeding port of the feeding bin is connected to the bottom end of the screw feeder. The crushing bin and the grinding bin are connected via the screw feeder, and the bottom end of the grinding bin is connected to the top end of the receiving bin. The bottom of the receiving bin is provided with a receiving bin inspection hole and a discharge port, and the secondary grinding return port is connected to the receiving bin.

[0005] In the industrial molten salt material grinding device described above, optionally, a crushing component is provided inside the crushing chamber. The crushing component includes a rotating rod and a cutting blade. A motor is fixedly installed on the top outer wall of the crushing chamber. The rotating rod is fixedly installed on the output end of the motor and passes through the top inner wall of the crushing chamber. The cutting blade is fixedly installed on the rotating rod.

[0006] In the industrial molten salt material grinding device described above, optionally, the crushing chamber further includes a receiving port and a crushing chamber inspection hole, wherein the receiving port is connected to the top of the thread feeder.

[0007] In the aforementioned industrial molten salt material grinding device, optionally, the grinding chamber is provided with a grinding component, a sieve disc, and a scraping component. The sieve disc is disposed on the inner wall at the bottom of the grinding chamber, and the scraping component is disposed on the top surface of the sieve disc.

[0008] In the aforementioned industrial molten salt material grinding device, optionally, the grinding assembly includes a drive rod, a grinding roller, and a push plate. A baffle is fixedly installed inside the grinding chamber, and a through groove is provided on the baffle. A second motor is fixedly installed at the top of the grinding chamber, and the drive rod is fixedly installed on the output end of the second motor. The drive rod passes through the baffle, and a first inclined surface is provided on the side of the baffle near the grinding chamber and the drive rod.

[0009] In the aforementioned industrial molten salt material grinding device, optionally, the grinding roller is mounted on a drive rod, the bottom end of the drive rod contacts the top surface of a baffle, the length of the drive rod is adapted to the width of the baffle, multiple sets of drive rods are provided, a push plate is disposed between two sets of drive rods, the push plate is fixedly mounted on the drive rod, and the bottom end of the push plate contacts the top surface of the baffle.

[0010] In the aforementioned industrial molten salt material grinding device, optionally, the scraping assembly includes a rotating shaft, a scraper, and a movable plate. The scraper is provided in multiple sets, all of which are mounted on the rotating shaft. The scraper is cross-shaped, and a first sliding block is fixedly installed on each adjacent surface of the scraper. The movable plate is adapted to the area of ​​the adjacent surface of the scraper. A first groove is provided on both sides of the movable plate, and the movable plate is slidably mounted on the first sliding block through the first groove.

[0011] In the aforementioned industrial molten salt material grinding device, optionally, a limiting rod is fixedly installed at the end of the moving plate away from the scraper, an annular groove is formed on the top surface of the sieve plate, the annular groove is connected to a first guide groove, the first guide groove corresponds to the secondary grinding return port, the limiting rod is slidably installed in the annular groove, a stop block is slidably installed inside the secondary grinding return port, a second inclined surface is provided on both sides of the stop block, a connecting plate is fixedly installed on the outer wall of the grinding chamber, a second sliding block is fixedly installed on the connecting plate, a second groove is formed on the stop block, the stop block is slidably installed on the second sliding block through the second groove, and a first spring is fixedly installed between the stop block and the connecting plate.

[0012] In the aforementioned industrial molten salt material grinding device, optionally, a connecting rod is fixedly installed at the center of the scraper, a strip groove is formed on the rotating shaft, one end of the connecting rod near the rotating shaft is inserted into the strip groove, a collar is rotatably installed on the outer wall of the connecting rod, the collar is slidably installed in the strip groove, a second spring is fixedly installed between the collar and the strip groove, an annular limiting groove is formed on the inner wall of the grinding chamber, a second guide groove is connected to the annular limiting groove, one end of the connecting rod away from the rotating shaft is slidably installed in the annular limiting groove, a stop bar is provided below the second guide groove, and the stop bar is fixedly installed on the inner wall of the grinding chamber.

[0013] This utility model discloses an industrial molten salt material grinding device, which is reasonably designed and easy to use. It uses a sieve plate to screen the ground molten salt particles, thereby improving the stability and consistency of the grinding quality. Molten salt particles with unqualified particle size are scraped to the feeding bin by the scraping component, realizing the automatic secondary grinding of molten salt products. Attached Figure Description

[0014] The disclosure of this utility model will become more apparent with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings:

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the connection structure between the grinding chamber and the receiving chamber of this utility model.

[0017] Figure 3 For the present utility model Figure 2 A sectional view.

[0018] Figure 4 This is a cross-sectional view of the grinding chamber of this utility model.

[0019] Figure 5 This is a schematic diagram of the scraper structure of this utility model.

[0020] Figure 6 For the present utility model Figure 4 A diagram illustrating the hidden block.

[0021] Figure 7 This is a schematic diagram of the structure of the movable plate of this utility model.

[0022] Reference numerals: 1. Feeding bin; 11. Feeding port; 12. Secondary grinding return port; 2. Screw feeder; 3. Crushing bin; 31. Crushing assembly; 32. Receiving port; 33. Crushing bin inspection hole; 4. Screw feeder; 5. Grinding bin; 51. Grinding assembly; 51-1. Baffle; 51-2. Through groove; 51-3. First inclined surface; 51-4. Drive rod; 51-5. Grinding roller; 51-6. Push plate; 52. Screen plate; 52-1. Annular chute; 52-2. First guide groove; 53. Scraper assembly; 53-1. Rotating shaft; 53- 11. Strip groove; 53-12. Collar; 53-13. Second spring; 53-2. Scraper; 53-3. Moving plate; 53-4. First sliding block; 53-5. First groove; 53-6. Limiting rod; 53-7. Connecting rod; 54. Stop block; 54-1. Second inclined surface; 54-2. Connecting plate; 54-3. Second sliding block; 54-4. Second groove; 54-5. First spring; 55. Annular limiting groove; 55-1. Second guide groove; 55-2. Stop bar; 6. Receiving bin; 61. Receiving bin inspection hole; 62. Discharge port. Detailed Implementation

[0023] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] like Figures 1 to 7 As shown, a typical embodiment of this utility model provides an industrial molten salt material grinding device, including: a feeding bin 1, a screw feeder 2, a crushing bin 3, a screw feeder 4, a grinding bin 5, and a receiving bin 6. The feeding bin 1 is provided with a feeding port 11 and a secondary grinding return port 12. The feeding bin 1 is connected to the screw feeder through the screw feeder. The feeding port 11 of the feeding bin 1 is connected to the bottom end of the screw feeder. The crushing bin 3 is connected to the grinding bin 5 through the screw feeder. The bottom end of the grinding bin 5 is connected to the top end of the receiving bin 6. The bottom of the receiving bin 6 is provided with a receiving bin inspection hole 61 and a discharge port 62. The secondary grinding return port 12 is connected to the receiving bin 6.

[0025] In use, the molten salt to be ground enters the feeding chamber 1 through the feeding port 11, and then enters the crushing chamber 3 through the screw feeder 2. In the crushing chamber 3, the molten salt to be ground is coarsely crushed. Then, the coarsely crushed molten salt is sent to the grinding chamber 5 through the screw feeder 4. The molten salt enters the grinding chamber 5 for grinding. After grinding, it enters the receiving chamber 6. Molten salt with qualified particle size enters the receiving chamber 6 and is packaged into finished products through the discharge port 62. Molten salt with unqualified particle size enters the feeding chamber 1 through the secondary grinding return port 12, realizing the automatic secondary grinding of molten salt products.

[0026] The crushing chamber 3 is equipped with a crushing component 31, which includes a rotating rod and a cutting blade. A motor is fixedly installed on the top outer wall of the crushing chamber 3. The rotating rod is fixedly installed on the output end of the motor and passes through the top inner wall of the crushing chamber 3. The cutting blade is fixedly installed on the rotating rod.

[0027] Inside the crushing chamber 3, the starting motor drives the rotating rod to rotate. When the rotating rod rotates, it drives the cutting blade to rotate. When the cutting blade rotates, it can coarsely crush the molten salt to be ground and send it into the threaded feeder.

[0028] The crushing chamber 3 also includes a receiving port 32 and a crushing chamber inspection hole 33. The receiving port 32 is connected to the top of the thread feeder.

[0029] Molten salt requiring coarse crushing enters the crushing chamber 3 through the receiving port 32 for crushing. The crushing chamber inspection port 33 is used for daily maintenance of the equipment.

[0030] The grinding chamber 5 is equipped with a grinding component 51, a sieve plate 52 and a scraping component 53. The sieve plate 52 is located on the inner wall at the bottom of the grinding chamber 5, and the scraping device is located on the top surface of the sieve plate 52.

[0031] The coarsely crushed molten salt enters the grinding chamber 5 through a screw feeder. The molten salt is ground by the grinding component 51 and then screened by the screen plate 52. Molten salt with qualified particle size enters the receiving chamber 6 and is packaged as finished product through the discharge port 62. Molten salt with unqualified particle size is scraped by the scraping device to the secondary grinding return port 12 of the feeding chamber 1, realizing automatic secondary grinding of molten salt products.

[0032] The grinding assembly 51 includes a drive rod 51-4, a grinding roller 51-5, and a push plate 51-6. A baffle 51-1 is fixedly installed inside the grinding chamber 5. A through groove 51-2 is provided on the baffle. A second motor is fixedly installed at the top of the grinding chamber 5. The drive rod 51-4 is fixedly installed on the output end of the second motor. The drive rod 51-4 passes through the baffle 51-1. A first inclined surface 51-3 is provided on the side of the baffle 51-1 near the grinding chamber 5 and the drive rod 51-4.

[0033] The grinding roller 51-5 is mounted on the drive rod 51-4. The bottom end of the drive rod 51-4 contacts the top surface of the baffle 51-1. The length of the drive rod 51-4 is adapted to the width of the baffle 51-1. The drive rod 51-4 is provided in multiple sets. The push plate 51-6 is arranged between two sets of drive rods 51-4. The push plate 51-6 is fixedly mounted on the drive rod 51-4. The bottom end of the push plate 51-6 contacts the top surface of the baffle 51-1.

[0034] The coarsely crushed molten salt enters the baffle 51-1. The first inclined surface 51-3 can gather the molten salt in the baffle 51-1. The second motor drives the drive rod 51-4 to rotate, and drives the grinding roller 51-5 to grind the molten salt. At the same time, the drive rod 51-4 can drive the push plate 51-6 to rotate, so that the ground molten salt is pushed into the through groove 51-2, so that the molten salt can enter the screen plate 52.

[0035] The scraping assembly 53 includes a rotating shaft 53-1, a scraper 53-2, and a moving plate 53-3. Multiple sets of scrapers 53-2 are provided, and all sets of scrapers 53-2 are set on the rotating shaft 53-1. The scrapers 53-2 are cross-shaped. First sliding blocks 53-4 are fixedly installed on the adjacent surfaces of the scrapers 53-2. The moving plate 53-3 is adapted to the area of ​​the adjacent surfaces of the scrapers 53-2. First grooves 53-5 are provided on both sides of the moving plate 53-3. The moving plate 53-3 is slidably installed on the first sliding blocks 53-4 through the first grooves 53-5.

[0036] When the drive rod 51-4 rotates, it drives the rotating shaft 53-1 to rotate, causing multiple sets of scrapers 53-2 to rotate. This allows the cavity of the cross-shaped scraper 53-2 to hold a portion of the molten salt, enabling the held molten salt to move. While moving, the molten salt with the correct particle size passes through the sieve plate 52 and enters the receiving bin 6. At the same time, the sliding plate 53-3 pushes the molten salt in the cavity, allowing it to be discharged from the grinding chamber 5 for secondary grinding. Meanwhile, when the first groove 53-5 contacts the first sliding block 53-4, it prevents the moving plate 53-3 from falling off the scraper 53-2.

[0037] A limiting rod 53-6 is fixedly installed at the end of the movable plate 53-3 away from the scraper 53-2. An annular groove 52-1 is opened on the top surface of the screen plate 52. The annular groove 52-1 is connected to a first guide groove 52-2. The first guide groove 52-2 corresponds to the secondary grinding return port 12. The limiting rod 53-6 is slidably installed in the annular groove 52-1. A stop block 54 is slidably installed inside the secondary grinding return port 12. A second inclined surface 54-1 is provided on both sides of the stop block 54. A connecting plate 54-2 is fixedly installed on the outer wall of the grinding chamber 5. A second sliding block 54-3 is fixedly installed on the connecting plate 54-2. A second groove 54-4 is opened on the stop block 54. The stop block 54 is slidably installed on the second sliding block 54-3 through the second groove 54-4. A first spring 54-5 is fixedly installed between the stop block 54 and the connecting plate 54-2.

[0038] When the scraper 53-2 rotates, the limiting rod 53-6 can drive the moving plate 53-3 to move. When the limiting rod 53-6 slides in the annular groove 52-1, it can keep the moving plate 53-3 at the innermost side, so that the amount of molten salt caught is larger.

[0039] When the limiting rod 53-6 slides in the first guide groove 52-2, it can drive the moving plate 53-3 to move in the scraper 53-2 and discharge the molten salt from the secondary grinding return port 12.

[0040] When the scraper 53-2 rotates, the end of the scraper 53-2 contacts the second inclined surface 54-1, causing the stop block 54 to slide on the second sliding block 54-3 and compressing the first spring 54-5, so that the stop block 54 moves away from the secondary grinding return port 12 and allows the molten salt to be discharged through the secondary grinding return port 12.

[0041] When the scraper 53-2 moves away from the stop block 54, the first spring 54-5 resets, causing the stop block 54 to block the secondary grinding return port 12, so that the scraper 53-2 can remove molten salt from the screen plate 52 as much as possible when rotating.

[0042] A connecting rod 53-7 is fixedly installed at the center of the scraper 53-2. A strip groove 53-11 is opened on the rotating shaft 53-1. The end of the connecting rod 53-7 near the rotating shaft 53-1 is inserted into the strip groove 53-11. A collar 53-12 is rotatably installed on the outer wall of the connecting rod 53-7. The collar 53-12 is slidably installed in the strip groove 53-11. A second spring 53-13 is fixedly installed between the collar 53-12 and the strip groove 53-11. An annular limiting groove 55 is opened on the inner wall of the grinding chamber 5. A second guide groove 55-1 is connected to the annular limiting groove 55. The end of the connecting rod 53-7 away from the rotating shaft 53-1 is slidably installed in the annular limiting groove 55. A stop bar 55-2 is provided below the second guide groove 55-1. A baffle 51-1 is fixedly installed on the inner wall of the grinding chamber 5.

[0043] When scraper 53-2 rotates, connecting rod 53-7 slides within an annular limiting groove 55, allowing scraper 53-2 to make close contact with screen plate 52. When connecting rod 53-7 slides within the second guide groove 55-1, it moves upward, causing collar 53-12 to slide within strip groove 53-11, compressing the second spring 53-13. At this time, one side of scraper 53-2 contacts stop rod 55-2. As scraper 53-2 rotates, it is restricted by stop rod 55-2, causing scraper 53-2 to flip in the direction of movement. The second spring 53-13 then resets, allowing scraper 53-2 to catch new molten salt, causing the new molten salt to move and be screened out through screen plate 52.

[0044] The technical scope of this utility model is not limited to the contents of the above description. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the scope of this utility model.

Claims

1. An industrial molten salt material grinding device, characterized in that, include: The feeding bin (1), screw feeder (2), crushing bin (3), screw feeder (4), grinding bin (5) and receiving bin (6) are provided. The feeding bin (1) is provided with a feeding port (11) and a secondary grinding return port (12). The feeding bin (1) is connected to the screw feeder through the screw feeder. The feeding port (11) of the feeding bin (1) is connected to the bottom end of the screw feeder. The crushing bin (3) is connected to the grinding bin (5) through the screw feeder. The bottom end of the grinding bin (5) is connected to the top end of the receiving bin (6). The bottom of the receiving bin (6) is provided with a receiving bin inspection hole (61) and a discharge port (62). The secondary grinding return port (12) is connected to the receiving bin (6).

2. The industrial molten salt material grinding device as described in claim 1, characterized in that, The crushing chamber (3) is equipped with a crushing component (31), which includes a rotating rod and a cutting blade. A motor is fixedly installed on the outer wall of the top of the crushing chamber (3). The rotating rod is fixedly installed on the output end of the motor and passes through the inner wall of the top of the crushing chamber (3). The cutting blade is fixedly installed on the rotating rod.

3. The industrial molten salt material grinding apparatus as described in claim 1, characterized in that, The crushing chamber (3) also includes a receiving port (32) and a crushing chamber inspection hole (33), wherein the receiving port (32) is connected to the top of the thread feeder.

4. The industrial molten salt material grinding device as described in claim 1, characterized in that, The grinding chamber (5) is equipped with a grinding component (51), a sieve disc (52) and a scraping component (53). The sieve disc (52) is located on the inner wall at the bottom of the grinding chamber (5), and the scraping component (53) is located on the top surface of the sieve disc (52).

5. The industrial molten salt material grinding apparatus as described in claim 4, characterized in that, The grinding assembly (51) includes a drive rod (51-4), a grinding roller (51-5), and a push plate (51-6). A baffle (51-1) is fixedly installed inside the grinding chamber (5). A through groove (51-2) is provided on the baffle (51-1). A second motor is fixedly installed at the top of the grinding chamber (5). The drive rod (51-4) is fixedly installed on the output end of the second motor. The drive rod (51-4) passes through the baffle (51-1). A first inclined surface (51-3) is provided on the side of the baffle (51-1) near the grinding chamber (5) and the drive rod (51-4).

6. The industrial molten salt material grinding apparatus as described in claim 5, characterized in that, The grinding roller (51-5) is mounted on the drive rod (51-4). The bottom end of the drive rod (51-4) contacts the top surface of the baffle (51-1). The length of the drive rod (51-4) is adapted to the width of the baffle (51-1). Multiple sets of drive rods (51-4) are provided. The push plate (51-6) is arranged between two sets of drive rods (51-4). The push plate (51-6) is fixedly mounted on the drive rod (51-4). The bottom end of the push plate (51-6) contacts the top surface of the baffle (51-1).

7. The industrial molten salt material grinding apparatus as described in claim 5, characterized in that, The scraping assembly (53) includes a rotating shaft (53-1), a scraper (53-2), and a moving plate (53-3). The scraper (53-2) is provided in multiple sets, and all sets of the scraper (53-2) are arranged on the rotating shaft (53-1). The scraper (53-2) is cross-shaped. The adjacent surfaces of the scraper (53-2) are fixedly installed with first sliding blocks (53-4). The area of ​​the moving plate (53-3) is adapted to the area of ​​the adjacent surfaces of the scraper (53-2). The moving plate (53-3) is provided with first grooves (53-5) on both sides. The moving plate (53-3) is slidably installed on the first sliding block (53-4) through the first grooves (53-5).

8. The industrial molten salt material grinding apparatus as described in claim 7, characterized in that, A limiting rod (53-6) is fixedly installed at the end of the movable plate (53-3) away from the scraper (53-2). An annular groove (52-1) is provided on the top surface of the sieve disc (52). The annular groove (52-1) is connected to a first guide groove (52-2), which corresponds to the secondary grinding return port (12). The limiting rod (53-6) is slidably installed within the annular groove (52-1). A stop block (54) is slidably installed inside the secondary grinding return port (12). The stop block (54) has a second inclined surface (54-1) on both sides. A connecting plate (54-2) is fixedly installed on the outer wall of the grinding chamber (5). A second sliding block (54-3) is fixedly installed on the connecting plate (54-2). A second groove (54-4) is opened on the stop block (54). The stop block (54) is slidably installed on the second sliding block (54-3) through the second groove (54-4). A first spring (54-5) is fixedly installed between the stop block (54) and the connecting plate (54-2).

9. An industrial molten salt material grinding apparatus as described in claim 7, characterized in that, A connecting rod (53-7) is fixedly installed at the center of the scraper (53-2). A strip groove (53-11) is provided on the rotating shaft (53-1). One end of the connecting rod (53-7) near the rotating shaft (53-1) is inserted into the strip groove (53-11). A collar (53-12) is rotatably installed on the outer wall of the connecting rod (53-7). The collar (53-12) is slidably installed in the strip groove (53-11). The collar (53-12) and the strip groove (53-11) are connected. A second spring (53-13) is fixedly installed between -11). An annular limiting groove (55) is provided on the inner wall of the grinding chamber (5). A second guide groove (55-1) is connected to the annular limiting groove (55). The end of the connecting rod (53-7) away from the rotating shaft (53-1) is slidably installed in the annular limiting groove (55). A stop bar (55-2) is provided below the second guide groove (55-1). The baffle (51-1) is fixedly installed on the inner wall of the grinding chamber (5).