A multi-sample hammer-type sample preparation and pulverizing machine

Abstract

This invention provides a multi-sample hammer-type sample preparation and pulverizing machine, including a casing and a protective cover hinged to the top of the casing and capable of opening and closing. When closed, the casing and the protective cover are sealed together. A horizontal support base is fixedly installed in the middle of the casing, and a support disc for fixing and mounting a mortar is provided above the support base. The support base and the support disc are connected by several return springs. The support disc is vertically raised and lowered by a drive mechanism. Multiple protective tube seats are evenly distributed along the circumference of the support disc, and a mortar fixedly connected to the protective tube seat is placed inside each protective tube seat. The protective tube seat and the mortar are fitted with a clearance fit. This invention uses vertical hammer-type pulverization to replace the original horizontal impact pulverization, allowing iron ore to quickly reach the target particle size through three-stage pulverization. Simultaneously, this invention can install multiple mortars, enabling simultaneous pulverization and sample preparation of multiple samples at once.

Description

Technical Field

[0001] This invention relates to the field of iron ore testing technology, and in particular to a multi-sample hammer-type sample preparation and pulverizing machine. Background Technology

[0002] Besides iron, iron ore often contains impurities or harmful elements. The content of these impurities or harmful elements affects the grade and price of the iron ore, thus determining its purchase price. Therefore, steel companies need to test the iron content in iron ore. The testing process involves collecting a certain amount of iron ore sample, repeatedly crushing and reducing it to a suitable particle size, drying it, and then using a sample preparation pulverizer to vibrate and grind it into a 200-mesh fine powder sample. This powder is then sent to a laser spectrometer for content analysis, thereby obtaining the precise iron content of the iron ore.

[0003] Sample preparation pulverizers are commonly used in industries such as power, coal, metallurgy, chemical, and building materials, as well as in scientific research departments such as commodity inspection and quality supervision. They are mainly used for pulverizing and preparing samples of metals and non-metallic minerals of various hardnesses. Currently, conventional sample preparation pulverizers can only install one sample preparation mortar. The sample preparation mortar is a steel mortar containing striking rings and striking blocks, which is fixed to the vibratory grinder by a clamping device. The eccentric block is driven by an electric motor to move at high speed, generating excitation force, which drives the striking rings and striking blocks inside the mortar to continuously collide with each other, crushing the material in the mortar into particles that meet the requirements for testing.

[0004] However, in the actual crushing process, the mortar and the impact ring and impact block collide randomly, which cannot ensure that the sample particles receive uniform impact. The particle size difference of the crushed sample particles is large. After crushing, it is necessary to sieve and crush again to make the sample particle size meet the test requirements. The sample preparation is time-consuming and the labor intensity of the personnel is high. Moreover, a sample preparation crusher can only be equipped with 1 to 3 mortars and can only crush 1 to 3 iron ore and prepare 1 to 3 samples at a time. However, a batch of iron ore samples is often transported in multiple carriages. During the test, samples need to be taken from each carriage, crushed, and then mixed evenly to become the final test sample. Using the existing sample preparation crusher makes the sampling of a batch of iron ore samples time-consuming and inefficient, and it is also easy to cause deviations in the test results.

[0005] Therefore, how to improve the shortcomings of conventional sample preparation pulverizers, such as long pulverization time and low sample preparation efficiency, has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] To address the aforementioned problems in the existing technology, the present invention aims to provide a multi-sample hammer-type sample preparation and pulverizing machine that can simultaneously pulverize multiple samples at one time, with high hammering force and high sample preparation efficiency.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0008] A multi-sample hammer-type sample preparation and pulverizing machine includes a casing and a protective cover hinged to the top of the casing and capable of opening and closing. When closed, the casing and the protective cover are sealed together. A horizontal support base is fixedly installed in the middle of the casing. A support disc for fixing and installing a mortar is installed above the support base. The support base and the support disc are connected by several return springs. The support disc is vertically raised and lowered by a drive mechanism. Multiple protective tube seats are evenly distributed along the circumference of the support disc. A mortar is placed in each protective tube seat and fixedly connected to the protective tube seat. The protective tube seat and the mortar are fitted with a clearance fit.

[0009] A further improvement of the present invention is that: four vertically arranged guide rods are also installed on the support base, and the four guide rods are arranged circumferentially with the center of the support disk as the center; the support disk is provided with guide holes that match the guide rods.

[0010] A further improvement of the present invention is that: the mortar includes a mortar body and a mortar lid that are sealed together; the mortar body is a vertical cylindrical shape, and a horizontally penetrating pin hole is provided in the solid part at the bottom of the mortar body; the top of the mortar body is provided with an external thread, and the mortar lid is provided with an internal thread that matches the external thread, and the mortar body and the mortar lid are threadedly connected; an upper hammer block, a middle hammer block and a lower hammer block are arranged sequentially from top to bottom inside the mortar body, and an impact gap is left between the upper hammer block and the mortar lid; a filter plate is also provided between the middle hammer block and the lower hammer block, and the filter plate slides with the inner diameter of the mortar body, and a plurality of sieve holes for iron ore powder to pass through are evenly distributed on the filter plate.

[0011] A further improvement of the present invention is that the upper hammer block, the middle hammer block, and the lower hammer block are all cylindrical blocks, and the diameters of the upper hammer block, the middle hammer block, and the lower hammer block gradually increase.

[0012] A further improvement of the present invention is that: the top of the bowl is provided with an external thread, and the bowl cover is provided with an internal thread that matches the external thread; the bowl and the bowl cover are connected by a threaded seal.

[0013] A further improvement of the present invention is that: a slot adapted to the bowl body is provided on the bowl lid, and a compression spring and a sealing gasket are provided between the bottom of the slot and the top of the bowl body.

[0014] A further improvement of the present invention is that: a vibrator is installed in the center of the bearing disc, and the mortars are evenly distributed around the vibrator in the circumference.

[0015] A further improvement of the present invention is that the driving mechanism includes a vibration cylinder vertically disposed at the bottom of the chassis shell, the piston rod of the vibration cylinder extends upward, passes through the support seat and is fixedly connected to the center of the bottom of the support disc, the air inlet pipe and the air outlet pipe of the vibration cylinder pass through the side wall of the chassis shell, and the air inlet pipe of the vibration cylinder is connected to a compressed air source.

[0016] A further improvement of the present invention is that: both the upper and lower ends of the reset spring are provided with limiting cylinders to prevent the reset spring from being over-compressed, and the upper and lower limiting cylinders are symmetrically arranged.

[0017] A further improvement of the present invention is that: a layer of sound-absorbing perforated plate is provided on the inner side of the chassis shell and the inner side of the protective cover, and sound-absorbing porous material is filled between the inner wall of the chassis shell and the sound-absorbing perforated plate, and between the inner wall of the protective cover and the sound-absorbing perforated plate.

[0018] The technological advancements achieved by this invention due to the adoption of the above technical solutions are as follows:

[0019] This invention provides a multi-sample hammer-type pulverizer comprising multiple mortars, capable of simultaneously pulverizing multiple iron ore samples at once. This solves the difficulty of simultaneously sampling multiple batches of ore from the same truck, achieving simultaneous pulverization of multiple samples and significantly improving sample preparation efficiency. This invention replaces the original horizontal impact pulverization with vertical hammer-type pulverization. As the particle size of the iron ore sample is continuously reduced, the sample gradually falls and continues to be pulverized until the target particle size is reached. Pulverization and sieving of the iron ore are carried out simultaneously, achieving the target particle size quickly through three stages of pulverization. Simultaneously, this invention also incorporates a vibrator in the center of the support base, providing small-amplitude horizontal oscillations to the mortars. This allows the iron ore sample to undergo both vertical hammer pulverization and small-amplitude horizontal impact, effectively pulverizing iron ore falling into the gaps outside the hammer blocks while simultaneously aiding in the continuous fall of the sample, ensuring efficient and rapid pulverization. Because this invention employs a vertical hammer-type pulverization method, the mortar shape becomes a tall, slender cylinder, allowing multiple mortars to be mounted on a single sample preparation machine.

[0020] This invention arranges three hammer blocks vertically to achieve zoned crushing. Coarse crushing is performed by the upper and middle hammer blocks, fine crushing by the middle hammer block and the filter plate, and final crushing by the lower hammer block and the bottom of the bowl. Iron ore sample particles with a diameter of 3mm-5mm are first coarsely crushed to 1mm, then finely crushed to 0.5mm, and finally finely crushed to 200 mesh to meet the sample testing requirements. During the crushing process, as the sample particle size decreases, the sample gradually falls to the bottom of the bowl, achieving stepwise sieving of the sample.

[0021] The mortar of this invention has an identification groove on the top, which can distinguish each sample, prevent sample confusion, and facilitate the tracking and traceability of the sample.

[0022] This invention incorporates a sound-absorbing perforated plate and porous sound-absorbing material inside the casing, effectively eliminating vibration noise and preventing noise pollution. The invention also features a sealed design between the bowl and its lid, and between the casing and the protective cover, minimizing the leakage of ore dust. Furthermore, a dust collector is included to adsorb and filter dust, and to clean the exhaust gas, preventing dust pollution in the workplace and promoting cleanliness and environmental protection. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 A top view of the supporting disc on which the mortar and pestle are mounted.

[0025] Figure 3 This is a schematic diagram of the structure of a mortar and pestle;

[0026] Figure 4 for Figure 3 A magnified structural diagram of part A in the middle;

[0027] In the diagram, 1. Chassis shell, 2. Protective cover, 3. Handle, 4. Bearing seat, 5. Bearing disc, 6. Return spring, 7. Vibration cylinder, 8. Piston rod, 9. Electrical box, 10. Guide rod, 11. Protective tube seat, 12. Mortar, 12-1. Mortar body, 12-2. Mortar cover, 12-3. Pin hole, 12-4. Upper hammer block, 12-5. Middle hammer block, 12-6. Lower hammer block, 12-7. Filter plate, 12-8. Marking groove, 12-9. Impact gap, 12-10. Compression spring, 12-11. Sealing gasket, 12-12. Iron ore sample, 13. Sound-absorbing perforated plate, 14. Sound-absorbing porous material, 15. Dust collector, 16. Electrical control cabinet, 17. Vibrator, 18. Limiting cylinder. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings.

[0029] A multi-sample hammer-type sample preparation and pulverizing machine, such as Figure 1 , Figure 2 As shown, the device includes a housing 1 and a protective cover 2 mounted on top of the housing 1. One end of the protective cover 2 is hinged to the housing 1 and can be opened and closed using the hinge axis. The other end of the protective cover 2 can be fastened and locked to the housing 1. To ensure a seal between the protective cover 2 and the housing 1 and prevent sample preparation dust from spilling out, a mounting groove for inserting the protective cover 2 is provided on the upper surface of the housing 1, and a sealing ring is provided in the mounting groove. A handle 3 is provided at the end of the protective cover 2 away from the hinge axis for easy operation by workers.

[0030] Preferably, the lower edge of the protective cover 2 is configured as a multi-level serrated shape. When the protective cover 2 is inserted into the mounting groove, the serrated lower edge can be fully pressed against the sealing ring to ensure sealing.

[0031] An electrical control cabinet 16 is installed on the front face of the chassis 1. A control mechanism is installed inside the electrical control cabinet 16 to control the start and stop of the sample preparation and pulverizing machine. To ensure safe operation, a safety limit switch is installed at the hinge shaft of the protective cover 2. This safety limit switch is connected to the control mechanism inside the electrical control cabinet 16. If the safety limit switch detects that the protective cover 2 is not locked and an operator accidentally starts the sample preparation and pulverizing machine, the machine will not start. If the protective cover 2 becomes loose due to vibration during sample preparation and pulverizing, the power will be immediately cut off and the machine will stop to prevent injury.

[0032] A horizontal support base 4 is fixedly installed in the middle of the chassis shell 1. The edge of the support base 4 is fixed to the inner wall of the chassis shell 1, and the fixing method can be a strong connection such as welding. A support disc 5 is installed above the support base 4, and the area of ​​the support disc 5 is smaller than that of the support base 4. The support base 4 and the support disc 5 are connected by several return springs 6, which are evenly distributed around the center of the support disc 5. The support disc 5 is driven by a pneumatic drive mechanism to achieve reciprocating motion. The drive mechanism includes a vertically installed vibration cylinder 7. The bottom of the vibration cylinder 7 is fixed to the bottom of the chassis shell 1, and the piston rod 8 of the vibration cylinder 7 extends upward, passes through the support base 4, and is fixedly connected to the center of the bottom of the support disc 5. The air inlet and outlet pipes of the vibration cylinder 7 pass through the side wall of the chassis shell 1 and are connected to a compressed air source. An electrical box 9 for driving the vibration cylinder 7 is installed on the outside of the chassis shell 1 near the air source. As the piston rod 8 extends and retracts, the bearing disk 5 rises and falls continuously. When the bearing disk 5 falls, it is damped by the return spring 6 to avoid violent vibration that could damage the equipment.

[0033] The return spring 6 has a limiting cylinder 18 at both its upper and lower ends. The limiting cylinder 18 at the upper end of the return spring 6 is welded to the lower end face of the bearing disk 5, and the limiting cylinder 18 at the lower end of the return spring 6 is welded to the upper end face of the bearing seat 4. Under normal working conditions, the two limiting cylinders 18 do not collide, and the return spring 6 extends and retracts within a controllable range. When the drive mechanism malfunctions, the stroke of the piston rod 8 becomes uncontrolled. When the return spring 6 is compressed to a certain extent, the two limiting cylinders 18 collide, preventing the return spring 6 from compressing further.

[0034] The support base 4 is also equipped with four vertically arranged guide rods 10, which are arranged circumferentially around the center of the support disk 5. The support disk 5 is provided with guide holes that match the guide rods 10. The cooperation between the guide rods 10 and the guide holes ensures that the support disk 5 can move vertically up and down.

[0035] A vibrator 17 is installed at the center of the upper surface of the bearing disk 5. Multiple protective tube seats 11 are evenly distributed around the outer circumference of the vibrator 17. Each protective tube seat 11 houses a mortar 12, with a clearance fit between the protective tube seat 11 and the mortar 12. Corresponding pin holes 12-3 are provided on the protective tube seat 11 and the mortar 12, allowing the mortar 12 to be securely installed within the protective tube seat 11 using pins (not shown in the figure). The number of protective tube seats on the bearing disk 5 can be selected according to the specifications of the sample preparation pulverizer and the sample preparation requirements. The protective tube seats 11 should be arranged axially symmetrically with the center of the bearing disk 5 as the axis to ensure uniform force distribution on the bearing disk 5 and vertical movement of the mortar 12. In this embodiment, as... Figure 2 As shown, the supporting disc 5 is provided with eight tube holders 11.

[0036] The mortar 12, as Figure 3 As shown, the bowl includes a bowl body 12-1 and a bowl lid 12-2 that are fastened together. The bowl body 12-1 is a vertical cylindrical shape, and a horizontally penetrating pin hole 12-3 is provided in the solid part at the bottom of the bowl body 12-1 for fixed connection with the protective tube seat 11.

[0037] The top of the bowl body 12-1 is provided with an external thread, and the bowl cover 12-2 is provided with an internal thread that matches the external thread. The bowl body 12-1 and the bowl cover 12-2 are fastened together by the threaded connection. Figure 4 As shown, the bowl cover 12-2 has a slot that matches the bowl body 12-1. A compression spring 12-10 and a sealing gasket 12-11 are arranged between the bottom of the slot and the top of the bowl body 12-1. The bowl body 12-1 is compressed by the rebound force of the compression spring 12-10 and the deformation of the sealing gasket 12-11, preventing the threads from loosening during vibration sample preparation. The compression spring 12-10 is preferably a wave spring, and the sealing gasket 12-11 is preferably a rubber gasket.

[0038] The top of the bowl cover 12-2 is also provided with an identification groove 12-8 for embedding and fixing labels, so that operators can mark the samples. The identification method can be selected according to actual needs, such as affixing labels in the identification groove 12-8, marking the labels with a pen, or directly printing labels and pasting them in the identification groove 12-8, or affixing QR codes in the identification groove 12-8 and having operators scan the codes to register, which facilitates the tracking and traceability of sample testing.

[0039] The bowl 12-1 is internally arranged with an upper hammering block 12-4, a middle hammering block 12-5, and a lower hammering block 12-6 arranged sequentially from top to bottom. All three hammering blocks are cylindrical, with their diameters gradually increasing. Specifically, the gap between the upper hammering block 12-4 and the inner wall of the bowl 12-1 is 1.5 mm, the gap between the middle hammering block 12-5 and the inner wall of the bowl 12-1 is 1 mm, and the gap between the lower hammering block 12-6 and the inner wall of the bowl 12-1 is 0.6 mm. The gap between the hammering blocks and the inner wall of the bowl 12-1 gradually decreases from top to bottom. Before sample preparation, the iron ore sample is placed between the upper hammer block 12-4 and the middle hammer block 12-5. As the hammering proceeds, the sample particles are gradually crushed and fall down along the gap between the hammer block and the inner wall of the bowl 12-1.

[0040] A certain impact gap 12-9 is left between the upper hammer block 12-4 and the bowl cover 12-2 so that the upper hammer block 12-4 has a sufficiently high jumping height and a sufficiently large downward hammering force to effectively hammer the iron ore powder placed between the upper hammer block 12-4 and the middle hammer block 12-5; generally speaking, the height of the impact gap 12-9 is not less than 1 / 3 of the height of the upper hammer block 12-4. A filter plate 12-7 is provided between the middle hammer block 12-5 and the lower hammer block 12-6. The filter plate 12-7 is 5mm thick and slides with the inner diameter of the bowl body 12-1. The filter plate 12-7 is evenly provided with a number of sieve holes for iron ore powder to pass through. The sieve hole diameter is 0.3mm~0.5mm, preferably 0.5mm. When the iron ore is crushed to a particle size smaller than the sieve hole diameter, it passes through the sieve hole and falls into the lower hammer block 12-6.

[0041] The bowl body 12-1, bowl cover 12-2, upper hammer block 12-4, middle hammer block 12-5, and lower hammer block 12-6 are all made of tungsten steel.

[0042] To avoid excessive noise during vibration, a layer of sound-absorbing perforated plate 13 is provided on the inner side of both the chassis shell 1 and the protective cover 2. Sound-absorbing porous material 14, such as sound-absorbing cotton or sound-absorbing fiber, is filled between the sound-absorbing perforated plates 13 on the inner wall of the chassis shell 1 and between the inner wall of the protective cover 2 and the sound-absorbing perforated plates 13. This can absorb vibration noise to the maximum extent and prevent hearing damage to operators.

[0043] To prevent dust from spreading during the crushing process, a dust collector 15 is installed at the rear of the casing 1. The dust collector 15 is cleaned regularly to recycle the collected iron ore powder.

[0044] The chassis shell 1 and protective cover 2 are both made of 3mm thick Q345D steel plate, and the fixed sound-absorbing perforated plate 13 is made of 2mm thick Q235 steel plate. The bowl body 12-1 and bowl cover 12-2 are both made of tungsten steel.

[0045] The process of using this invention is as follows:

[0046] Step 1: Open the mortar lid and install the lower hammer block, filter plate and middle hammer block in sequence;

[0047] Step 2: Load in pre-crushed iron ore sample particles with a particle size of 3mm~5mm, then load in the upper hammer block, and tighten the lid to seal; and mark the sample on the outside of the bowl.

[0048] Step 3: Place the mortar into the tube holder on the sample preparation machine bearing disc in sequence, and insert the locking pin, locking pin spring clip and locking nut to fix the mortar to the tube holder one by one.

[0049] Step 4: Close and lock the protective cover, turn on the power of the sample preparation and pulverizer to prepare the sample, and turn on the vibrator at the same time;

[0050] During sample preparation, the drive mechanism provides vertical lifting power to the supporting disc, causing the mortar to vibrate up and down. The upper hammer repeatedly jumps and strikes, crushing the iron ore sample. Simultaneously, the vibrator provides small-amplitude oscillations to the supporting disc, allowing the mortar to oscillate horizontally while moving vertically up and down. The iron ore sample falling between the hammer and the inner wall of the mortar is crushed under the force of the horizontal oscillation. When the particle size of the iron ore sample is less than 1 mm, it falls along the gap on the outside of the middle hammer and is repeatedly struck by the middle hammer at the filter plate. When the particle size of the iron ore sample is less than 0.5 mm, it passes through the sieve holes of the filter plate and continues to fall along the gap on the outside of the lower hammer, and is repeatedly struck by the lower hammer at the bottom of the mortar until the particle size becomes finer, reaching the 200 mesh required for testing.

[0051] Step 5: Turn off the power and oscillator of the sample preparation machine, open the protective cover, loosen the locking nut, remove the locking pin, and take out the mortars one by one; open the mortar cover, and take out the upper hammer block, middle hammer block, and filter plate in sequence. When taking them out, pour out the larger iron ore sample particles together. Take out the lower hammer block, take out and collect the iron ore powder at the bottom of the mortar, pass it through a 200-mesh sieve, and send it to the laser spectrometer for detection.

[0052] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.

Claims

1. A multi-sample hammer-type preparation pulverizer characterized by comprising: The utility model provides a kind of automatic mortar mill, including cabinet shell (1), hinged installation is closed in cabinet shell (1) top and can realize the protection cover (2) of opening and closing, after buckling, cabinet shell (1) and protection cover (2) are sealed connection;The middle part of the cabinet shell (1) is fixedly provided with a horizontal carrier seat (4), a carrier disc (5) for fixedly installing mortar (12) is arranged above the carrier seat (4), the carrier seat (4) and the carrier disc (5) are connected by a plurality of reset springs (6), the carrier disc (5) is vertically lifted by driving mechanism;A plurality of protective tube seats (11) are evenly distributed around the center of the carrier disc (5), each protective tube seat (11) is placed with a mortar (12) fixedly connected with the protective tube seat (11), the protective tube seat (11) and the mortar (12) are gap matched; The mortar (12) includes a mortar body (12-1) and a mortar cover (12-2) that are sealed and buckled together;The mortar body (12-1) is a vertical cylinder, and a transverse through pin hole (12-3) is provided at the solid portion of the bottom end of the mortar body (12-1);The top of the mortar body (12-1) is provided with external threads, the mortar cover (12-2) is provided with internal threads matched with the external threads, and the mortar body (12-1) and the mortar cover (12-2) are threadedly connected;The inside of the mortar body (12-1) is sequentially provided from top to bottom with an upper hammering block (12-4), a middle hammering block (12-5), and a lower hammering block (12-6), and a striking gap (12-9) is left between the upper hammering block (12-4) and the mortar cover (12-2);A filter hole plate (12-7) is further provided between the middle hammering block (12-5) and the lower hammering block (12-6), and the filter hole plate (12-7) is slidingly matched with the inner diameter of the mortar body (12-1), and a plurality of sieve holes for allowing iron ore powder to leak are evenly arranged on the filter hole plate (12-7); The upper hammering block (12-4), the middle hammering block (12-5), and the lower hammering block (12-6) are all cylindrical blocks, and the diameters of the upper hammering block (12-4), the middle hammering block (12-5), and the lower hammering block (12-6) gradually increase; A central exciter (17) is mounted on the carrier disc (5), and the mortar (12) is evenly distributed around the central exciter (17).

2. A multi-sample hammer mill-type comminution device according to claim 1, characterized in that: Four vertically arranged guide rods (10) are further mounted on the carrier seat (4), and the four guide rods (10) are arranged around the center of the carrier disc (5);The carrier disc (5) is provided with guide holes matched with the guide rods (10).

3. A multi-sample hammer mill-type comminution device according to claim 1, characterized in that: The mortar cover (12-2) is provided with a slot matched with the mortar body (12-1), and a compression spring (12-10) and a sealing gasket (12-11) are arranged between the bottom of the slot and the top end of the mortar body (12-1).

4. A multi-sample hammer mill-type comminuting device according to claim 1, characterized in that: The driving mechanism includes a vertically arranged vibration cylinder (7) at the bottom of the cabinet shell (1), the piston rod (8) of the vibration cylinder (7) extends upward, penetrates through the carrier seat (4), and is fixedly connected with the bottom center of the carrier disc (5), the air inlet pipe and the air outlet pipe of the vibration cylinder (7) penetrate through the side wall of the cabinet shell (1), and the air inlet pipe of the vibration cylinder (7) is connected with a compressed air source.

5. A multi-sample hammer mill-type comminuting device according to claim 1, characterized in that: The upper and lower ends of the reset spring (6) are provided with limiting cylinders (18) for preventing the reset spring (6) from being compressed excessively, and the upper and lower limiting cylinders (18) are symmetrically arranged.

6. A multi-sample hammer mill-type comminuting device according to claim 1, characterized in that: The inner side of the case shell (1) and the inner side of the protective cover (2) are both provided with a layer of sound absorption hole plate (13), and the sound absorption hole plate (13) is filled with sound absorption porous material (14) between the inner wall of the case shell (1) and the sound absorption hole plate (13) and between the inner wall of the protective cover (2) and the sound absorption hole plate (13).

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