Automatic grinder

Abstract

The utility model relates to a grinder, in particular to an automatic grinder. A mortar fixing device is arranged on the machine base, the upper machine frame is arranged above the machine base, a mortar rod chuck device is arranged on the upper machine frame, a lifting mechanism is arranged between the machine base and the upper machine frame, and a transmission mechanism is arranged between the mortar rod chuck device and the machine base. The lifting mechanism comprises a lower guide sleeve, an upper guide sleeve, a driving sleeve, a gear and a gear motor, the lower guide sleeve is arranged at the upper end of the machine base, the upper guide sleeve is sleeved outside the lower guide sleeve, the upper end of the upper guide sleeve is connected with the upper machine frame, the driving sleeve is arranged in the lower guide sleeve, the outer wall of the driving sleeve is provided with a rack, and the gear meshed with the rack is arranged in the lower guide sleeve. The gear is driven by a first gear motor. Compared with the prior art, the upper machine frame and the machine base are connected through the lifting mechanism, and the height of the grinding rod is convenient to adjust; the grinding rod is pressed in the mortar through the overall weight of the upper rack, so that the grinding force is large, and the efficiency is high; and the grinding rod is convenient to replace and suitable for grinding rods of different specifications.

Description

Technical Field

[0001] This utility model relates to a grinder, and more particularly to an automatic grinder. Background Technology

[0002] A mortar and pestle is a commonly used laboratory instrument and an essential tool for grinding. Common sizes of mortars range from 6 to 16 centimeters in diameter, and common materials include ceramic, glass, metal, and agate. The operation involves the lab worker holding the mortar with one hand and the mortar stick with the other, grinding by rubbing the tip of the stick against the mortar. Grinding is a manual operation, and when grinding materials at low temperatures (such as liquid nitrogen) or requiring prolonged grinding (such as preparing certain staining solutions), the grinding process can be strenuous and inefficient.

[0003] Patent application CN10612471A discloses a cryogenic liquid nitrogen polymer grinder. This patent application adjusts the grinding force by using weights to adjust the cantilever. When it is necessary to remove the grinding material from the mortar, the V-belt must first be removed from the main or secondary gradient pulley, the counterweight removed, the cantilever raised and rotated left and right to make the spherical pressure head rotate out of the range of the secondary gradient pulley, and the grinding rod lifted upwards until the spherical protrusion of the grinding rod is higher than the sum of the height of the mortar and the annular tray. Only then can the mortar be removed. The whole process is cumbersome and can only be operated after the machine is powered off and stopped. Precise control cannot be achieved, and the operation of changing the grinding rod is cumbersome.

[0004] The device uses a ring-shaped tray to fix the mortar and pestle. The tray is fixed to the base and its size is not adjustable, making the mortar and pestle sizes non-replaceable. This limits the device to grinding materials with a capacity equivalent to that of the mortar and pestle, resulting in poor versatility. When the amount to be ground is too large or too small compared to the appropriate mortar and pestle capacity, the mortar becomes unsuitable. If a mortar with a capacity and outer curvature that does not match the tray is used, stability during operation is poor. The mortar and pestle will rotate and move with the rotation of the grinding rod, or the inner curvature of the mortar and grinding rod may not be compatible, leading to a decrease in grinding efficiency. Utility Model Content

[0005] The present invention aims to solve the above-mentioned technical problems, thereby providing an automatic grinder that reduces labor intensity and improves grinding efficiency.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0007] An automatic grinder includes a base, an upper frame, and a drive mechanism. The base is equipped with a mortar and pestle fixing device.

[0008] The upper frame is placed above the base, and the upper frame is equipped with a mortar and pestle clamping device. A lifting mechanism is provided between the base and the upper frame, and a transmission mechanism is provided between the mortar and pestle clamping device and the base.

[0009] The lifting mechanism includes a lower guide sleeve, an upper guide sleeve, a drive sleeve, a rack, a gear, and a first reduction motor. The lower guide sleeve is placed on the upper end of the base, and the upper guide sleeve is sleeved outside the lower guide sleeve. The upper end of the upper guide sleeve is connected to the upper frame. The drive sleeve is placed inside the lower guide sleeve and has a rack on its outer wall. The lower guide sleeve has a gear that meshes with the rack. The gear is driven by the first reduction motor.

[0010] Furthermore, the optimized solution of this utility model is:

[0011] The transmission mechanism includes a first transmission shaft, a first transmission assembly, a second transmission assembly, a second transmission shaft, and a third transmission assembly. The first transmission shaft is vertically arranged and passes through the lower guide sleeve and the drive sleeve. The drive mechanism is driven by the first transmission assembly, the first transmission shaft is driven by the second transmission assembly, and the second transmission shaft drives the mortar rod clamping device through the third transmission assembly.

[0012] The mortar rod chuck device includes a main shaft, a rotating disk, a grinding shaft, a pressure ring, clamping plates, and a clamping plate outer sleeve. The main shaft is vertically arranged and rotatably connected to the upper frame. The main shaft is driven by a third transmission assembly and a second transmission shaft. A rotating disk is installed at the lower end of the main shaft, and the rotating disk has multiple connecting holes. The grinding shaft is installed in the connecting holes. A drive disk is provided at the lower end of the grinding shaft. The drive disk has multiple radial sliding grooves. Multiple clamping plates are provided at the bottom of the drive disk. The clamping plates have an inverted frustum structure. The top of each clamping plate has a slider that passes through the sliding groove. The top of the slider has a sliding sleeve. The sliding sleeve is slidably connected to a horizontal sliding rod. The inner end of the sliding rod is fixed to the grinding shaft. A second spring is fitted on the sliding rod between the sliding sleeve and the grinding shaft. A clamping plate outer sleeve is fitted on the outside of the grinding shaft. A first spring is fitted on the grinding shaft between the top plate of the clamping plate outer sleeve and the drive disk. A connecting rod is provided at the bottom of the bottom plate of the clamping plate outer sleeve. A pressure ring is provided at the bottom of the connecting rod. The pressure ring is fitted on the outside of the clamping plates.

[0013] The first transmission component is a bevel gear assembly or a worm gear assembly, the second transmission component is a bevel gear assembly or a worm gear assembly, and the third transmission component is a bevel gear assembly or a worm gear assembly.

[0014] The mortar fixing device includes a fixed plate, a rotating plate, grippers, a fourth transmission assembly, and a second reduction motor. The fixed plate is mounted on the top of the machine base and has multiple radial first sliding holes. The rotating plate is placed at the bottom of the fixed plate and is rotatably connected to the machine base. The rotating plate has second sliding holes corresponding to the first sliding holes. The second sliding holes are arc-shaped and rotate in the same direction. The lower end of the grippers passes through the first and second sliding holes. The second reduction motor drives the rotating plate through the fourth transmission assembly.

[0015] The fourth transmission component is a bevel gear assembly or a worm gear assembly.

[0016] A positioning mechanism is provided between the upper guide sleeve and the machine base. The positioning mechanism includes a brake plate and a caliper disc brake. The brake plate is vertically mounted on the machine base, and the caliper disc brake is mounted on the upper guide sleeve.

[0017] The upper frame is a hollow structure, and the second drive shaft is located inside the upper frame.

[0018] The lower end of the first drive shaft is provided with a thrust bearing.

[0019] The second drive shaft is rotatably connected to the upper frame via a bearing housing.

[0020] Compared with the prior art, the advantages of this utility model using the above technical solution are: the upper frame and the base are connected by a lifting mechanism, making it easy to adjust the height of the grinding rod; the mortar is easy to pick up and put in, and is suitable for various sizes of mortars; the grinding rod is pressed into the mortar by the weight of the upper frame itself, resulting in strong grinding force and high efficiency; the grinding rod is easy to replace, and is suitable for various sizes of grinding rods. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the lifting mechanism according to an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the lifting mechanism using gear and rack transmission in an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the mortar and pestle clamp device according to an embodiment of the present utility model;

[0025] Figure 5 A schematic diagram of the clamping plate of the mortar rod clamping device according to an embodiment of the utility model;

[0026] Figure 6 This is a schematic diagram of the mortar fixing device according to an embodiment of the utility model;

[0027] Figure 7 A schematic diagram of the fixing plate of the mortar fixing device according to the novel embodiment;

[0028] Figure 8 A schematic diagram of the rotating disk of the mortar fixing device according to a novel embodiment;

[0029] Figure 9 This is a schematic diagram of the lifting mechanism using a bevel gear assembly transmission in an embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of the overall structure of the present invention, including the positioning mechanism marking portion.

[0031] In the diagram: 1. Base; 101. Support plate; 2. Upper frame; 3. Lifting mechanism; 301. Lower guide sleeve; 302. Upper guide sleeve; 303. Drive sleeve; 304. Rack; 305. Gear; 306. Shaft seat; 307. First geared motor; 308. Motor base plate; 309. Transmission mechanism; 4. First transmission shaft; 401. First transmission assembly; 402. Second transmission assembly; 403. Vertical bevel gear; 4031. Bevel gear shaft seat; 4032. Horizontal bevel gear; 4033. Connecting plate; 4034. Second transmission shaft; 404. Third transmission assembly; 405. Thrust bearing; 406. Second geared motor; 4 07; Mortar and pestle clamp device 5; Grinding shaft 501; Pressure ring 502; Second spring 503; Clamping plate sleeve 504; Connecting rod 505; Drive disk 506; Slide groove 5061; Clamping plate 507; Slider 508; Sliding sleeve 509; Sliding rod 510; First spring 511; Main shaft 512; Rotating disk 513; Mortar and pestle fixing device 6; Fixing disk 601; First sliding hole 6011; Rotating disk 602; Second sliding hole 6021; Clamping jaw 603; Fourth transmission assembly 604; Connecting shaft 605; Positioning mechanism 7; Brake plate 701; Clamping disc brake 702; Mortar and pestle 8. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0033] See Figures 1-8 This embodiment provides an automatic grinder, which mainly consists of a base 1, an upper frame 2, a lifting mechanism 3, a transmission mechanism 4, a mortar and pestle clamping device 5, and a mortar fixing device 6. The base 1 is a welded component of a box structure, which is a cuboid. The upper frame 2 is provided on the top of the base 1. The upper frame 2 is a welded component and has a hollow structure.

[0034] A lifting mechanism 3 is provided between the base 1 and the upper frame 2. The lifting mechanism 3 mainly consists of a lower guide sleeve 301, an upper guide sleeve 302, a drive sleeve 303, a rack 304, a gear 305, and a first reduction motor 308. The lower guide sleeve 301 and the upper guide sleeve 302 have circular, square, or rectangular cross-sections. The lower guide sleeve 301 is installed on the right side of the upper end of the base 1, and the upper guide sleeve 302 is fitted over the lower guide sleeve 301. The upper end of the upper guide sleeve 302 is installed at the bottom of the right end of the upper frame 2. A drive sleeve 303 is placed inside a lower guide sleeve 301. Racks 304 are symmetrically mounted on both sides of the outer wall of the drive sleeve 303, arranged vertically. Gears 305 are symmetrically mounted on the upper end of the lower guide sleeve 301. Gears 305 are rotatably connected to a shaft 306 and a bearing 307, and are keyed to the shaft 306. The bearing 307 is welded to the inner wall of the lower guide sleeve 301. A shaft hole is formed at the outer end of the left axle 306, penetrating the outer wall of the lower guide sleeve 301. The shaft hole at the outer end of the left axle 306 is connected to the output shaft of a first reduction motor 308 via a key. The first reduction motor 308 is connected to the lower guide sleeve 301 via a motor base plate 309. The gears 305 mesh with the racks 304, thereby driving the upper guide sleeve 302 and the upper frame 1 to rise and fall. The gears 305 are driven by the first reduction motor 308, which can employ a parking brake structure, allowing the upper frame 2 to stop at any position. To increase the stability of the lifting mechanism 3, four racks 304 can be installed on the outer wall of the drive sleeve 303. The four racks 304 are arranged in a cross shape, and each rack 304 meshes with a gear 305.

[0035] A mortar and pestle clamping device 5 is installed at the bottom left end of the upper frame 2, and the mortar and pestle clamping device 5 is driven by a transmission mechanism 4. The transmission mechanism 4 mainly consists of a first transmission shaft 401, a first transmission assembly 402, a second transmission assembly 403, a second transmission shaft 404, and a third transmission assembly 405. The first transmission shaft 401 is vertically installed on the right side of the base 1. A thrust bearing 406 is installed between the lower end of the first transmission shaft 401 and the base plate of the base 1. A drive mechanism is installed in the base 1 on the left side of the first transmission shaft 401. The drive mechanism adopts a second geared motor 407. The second geared motor 407 and the first transmission shaft 401 are driven by the first transmission assembly 402. The first transmission assembly 402 adopts a bevel gear assembly or a worm gear assembly. The first transmission assembly 402 realizes a 90-degree transmission between the second geared motor 407 and the first transmission shaft 401. Other 90-degree transmission structures can also be adopted. The upper end of the first transmission shaft 401 extends into the upper frame 2 after passing through the lower guide sleeve 301 and the drive sleeve 303. A horizontal second drive shaft 404 is installed inside the upper frame 2, and the second drive shaft 404 is rotatably connected to the upper frame 2 through a bearing seat. The first drive shaft 401 and the second drive shaft 404 are driven by a second drive assembly 403. The second drive assembly 403 adopts a worm gear assembly. When the second drive assembly 403 adopts a worm gear assembly, the worm is installed at the upper end of the first drive shaft 401.

[0036] The mortar and pestle chuck device 5 mainly consists of a grinding shaft 501, a pressure ring 502, a clamping sleeve 504, a clamping plate 507, a main shaft 512, and a rotating disk 513. The main shaft 512 is vertically arranged, and its upper end is rotatably connected to the upper frame 2 via a bearing seat. The upper end of the main shaft 512 is driven by a third transmission assembly 405, which is a bevel gear assembly, a bevel gear assembly, or a worm gear assembly. A circular rotating disk 513 is installed at the lower end of the main shaft 512. The rotating disk 513 has multiple rings of connecting holes, with multiple holes per ring. A vertical grinding shaft 501 is installed in the connecting holes of the rotating disk 513. The grinding shaft 501 is threaded to the connecting holes, or it can be connected using the Morse taper structure of a drill bit. The grinding shaft 501 can be installed in connecting holes at different positions to grind different parts of the mortar and pestle 8. A circular drive disc 506 is mounted on the lower end of the grinding shaft 501. The drive disc 506 has four radial grooves 5061, which are cross-shaped. The bottom of the drive disc 506 has four arc-shaped clamping pieces 507, which are inverted truncated cones. The inner hole formed by the four clamping pieces 507 is a circular hole. A slider 508 is welded to the top of each clamping piece 507. The upper end of the slider 508 passes through the groove 5061 and is slidably connected to it. A sliding sleeve 509 is welded to the top of the slider 508. The sliding sleeve 509 is slidably connected to a horizontal sliding rod 510. The inner end of the sliding rod 510 is fixedly connected to the grinding shaft 501. A second spring 503, which is a compression spring, is fitted onto the sliding rod 510 between the sliding sleeve 509 and the grinding shaft 501.

[0037] A clamping sleeve 504 is fitted onto the outer side of the grinding shaft 501. The top and bottom plates of the clamping sleeve 504 each have circular holes. A first spring 511, a compression spring, is fitted between the bottom surface of the top plate of the clamping sleeve 504 and the drive disc 506 on the grinding shaft 501. Three connecting rods 505 are installed at the bottom of the bottom plate of the clamping sleeve 504. Each connecting rod 505 consists of an inclined portion and a horizontal portion. A circular pressure ring 502 is installed at the inner end of the horizontal portion, and the pressure ring 502 is fitted onto the outer side of the four clamping pieces 507. Pulling down the clamping sleeve 504 causes the pressure ring 502 to move downwards. The first spring 511 drives the sliding sleeve 509 away from the grinding shaft 501. The sliding sleeve 509, through the slider 508, causes the clamping piece 507 to move radially outwards, thus opening the clamping piece 507 and installing the grinding rod inside it. Releasing the clamping sleeve 504 causes it to move upwards, moving the pressure ring 502 upwards. The clamping sleeve 504 then causes the clamping piece 507 to move radially inwards, thus clamping the grinding rod. In this embodiment, multiple pressure rings 502 of different diameters can be installed to clamp different parts of the clamping piece 507.

[0038] A mortar fixing device 6 is installed on the base 1, located directly below the rotating disk 513. The mortar fixing device 6 mainly consists of a fixing disk 601, a rotating disk 602, grippers 603, a fourth transmission assembly 604, a connecting shaft 605, and a second reduction motor. The fixing disk 601 is circular and horizontally arranged, and is bolted to the base 1. The fixing disk 601 can be installed on the upper, lower, or lower part of the top plate of the base 1. When the fixing disk 601 is installed on the lower or lower part of the top plate of the base 1, a cross-shaped through hole is opened in the top plate. The fixing disk 601 has radial first sliding holes 6011, and the four first sliding holes 6011 are cross-shaped. The rotating disk 602 is placed at the bottom of the fixing disk 601, and the rotating disk 602 is rotatably connected to the support plate 101 of the base 1 via the connecting shaft 605 and bearings. The connecting shaft 605 is vertically arranged. The rotating disk 602 has four arc-shaped second sliding holes 6021, with the four second sliding holes 6021 rotating in the same direction. The second sliding holes 6021 correspond to the first sliding holes 6011. The fixed disk 601 is provided with four grippers 603, each gripper consisting of an arc-shaped portion and a vertical portion. The arc-shaped portion of the gripper 603 penetrates the top plate of the machine base 1, and the lower end of the vertical portion of the gripper 603 penetrates the first sliding hole 6011 and the second sliding hole 6021. To limit the movement of the grippers 603, the cross-section of the first sliding hole 6011 is T-shaped, and the vertical portion of the gripper 603 has an inverted stepped structure.

[0039] The rotating disk 602 is driven by the fourth transmission assembly 604, which employs a disc gear and a bevel gear. The disc gear is mounted on the bottom of the rotating disk 602, and the bevel gear is mounted on the output shaft of the third geared motor. The third geared motor is mounted on the base 1. In this embodiment, the rotating disk 602 and the disc gear are an integral structure, but they can also be separate structures. The third geared motor drives the rotating disk 602 to rotate through the fourth transmission assembly 604, driving the gripper 603 to slide within the second sliding hole 6021 and the first sliding hole 6011, thereby clamping and releasing the mortar 8.

[0040] The usage process of this embodiment is as follows: First, install the mortar 8, start the third reduction motor, the third reduction motor drives the rotating disk 602 to rotate through the fourth transmission component 604, the rotating disk 602 drives the grippers 603 to open, and place the mortar 8 on the fixed disk 601. The third reduction motor rotates in the opposite direction, and the four grippers 603 clamp the mortar 8. Then, start the first reduction motor 308, the first reduction motor 308 drives the upper frame 2 to rise through the gear 305 and rack 304, so that the grinding rod has sufficient installation space.

[0041] Pull the clamping plate outer sleeve 504 downwards by hand. The moving clamping plate outer sleeve 504 drives the pressure ring 502 downwards. The first spring 511 drives the sliding sleeve 509 away from the grinding shaft 501. The sliding sleeve 509 drives the clamping plate 507 radially outwards through the slider 508, thereby opening the clamping plate 507. The grinding rod is installed in the clamping plate 507. Release the clamping plate outer sleeve 504. The clamping plate outer sleeve 504 moves upwards, driving the pressure ring 502 upwards. The clamping plate outer sleeve 504 causes the clamping plate 507 to move radially inwards, thereby clamping the grinding rod. Start the first reduction motor 308. The first reduction motor 308 drives the upper frame 1 to descend through the gear 305 and rack 304 for grinding.

[0042] As one embodiment of this utility model, the second transmission component 403 adopts a bevel gear assembly ( Figure 9 As shown, the upper part of the first drive shaft 401 is provided with a spline structure. The vertical bevel gear 4031 is rotatably connected to the vertical part of the L-shaped bevel gear bearing 4032. The vertical bevel gear 4031 is installed at the end of the second drive shaft 404. The horizontal bevel gear 4033 is rotatably connected to the horizontal part of the bevel gear bearing 4032 through a bearing seat. The horizontal bevel gear 4033 has a spline in its shaft hole. The horizontal bevel gear 4033 is slidably connected to the first drive shaft 401 through a spline. The end of the horizontal part of the bevel gear bearing 4032 is connected to the upper frame 2 through a connecting plate 4034.

[0043] As an embodiment of this utility model, a positioning mechanism 7 is provided between the upper guide sleeve 302 and the base 1. Figure 10 As shown, the positioning mechanism consists of a brake plate 701 and a caliper disc brake 702. The brake plate 701 is vertically mounted on the base 1, and the caliper disc brake 702 is mounted on the upper guide sleeve 302. The caliper disc brake 702 can be electromagnetic. The cooperation between the brake plate 701 and the caliper disc brake 702 allows the upper frame 1 to stop at any position. The caliper disc brake 702 of the positioning mechanism 7 can also adopt a car brake caliper structure.

[0044] As an embodiment of this utility model, the inner wall of the clamping piece 507 is provided with a positioning groove, and a radial positioning piece is installed on the outer circumferential surface of the grinding rod. The positioning piece cooperates with the positioning groove to improve the clamping effect of the grinding rod.

[0045] The upper frame 1 of this invention can also be integrated with the upper guide sleeve 302. This invention is controlled by a control circuit. In this embodiment, a waste liquid collection box is provided to collect overflow liquid. The sponge inside the collection box can absorb the overflow liquid and prevent the control circuit from being corroded by the overflow liquid.

[0046] In this embodiment, a speed adjustment knob can be added to the control circuit board to realize stepless speed change of the motor or speed adjustment in stages, which can realize the adjustment of the grinding speed during the grinding process.

[0047] This embodiment uses a four-jaw chuck to fix the mortar and pestle. Not only can the machine be adapted to various sizes of commercially available mortars and pestles by adjusting the fixing jaws on the chuck, but regardless of the size of the mortar and pestle, it can be fixed to the machine body by the chuck, so that it will not rotate or move with the rotation of the grinding rod, thus ensuring the grinding effect.

[0048] This invention can fix various specifications and materials of commercially available mortars and pestles, and can easily fix and release the grinding rods that come with each mortar and pestle. This ensures that this application can not only perform grinding operations in molecular biology experiments, but also in experimental projects in other disciplines. There is no need to consider whether it is a physical, chemical or biological experiment, or a cell biology experiment or a molecular biology experiment, nor is there any need to consider the grinding materials and experimental quantities. You only need to select the appropriate mortar and pestle, which truly achieves a wide range of applications.

Claims

1. An automatic grinder, comprising a base, an upper frame, and a drive mechanism, wherein the base is provided with a mortar fixing device, characterized in that: The upper frame is placed above the base, and the upper frame is equipped with a mortar and pestle clamping device. A lifting mechanism is provided between the base and the upper frame, and a transmission mechanism is provided between the mortar and pestle clamping device and the base. The lifting mechanism includes a lower guide sleeve, an upper guide sleeve, a drive sleeve, a rack, a gear, and a first reduction motor. The lower guide sleeve is placed on the upper end of the base, and the upper guide sleeve is sleeved outside the lower guide sleeve. The upper end of the upper guide sleeve is connected to the upper frame. The drive sleeve is placed inside the lower guide sleeve and has a rack on its outer wall. The lower guide sleeve has a gear that meshes with the rack. The gear is driven by the first reduction motor.

2. The automatic grinder according to claim 1, characterized in that: The transmission mechanism includes a first transmission shaft, a first transmission assembly, a second transmission assembly, a second transmission shaft, and a third transmission assembly. The first transmission shaft is vertically arranged and passes through the lower guide sleeve and the drive sleeve. The drive mechanism is driven by the first transmission assembly, the first transmission shaft is driven by the second transmission assembly, and the second transmission shaft drives the mortar rod clamping device through the third transmission assembly.

3. The automatic grinder according to claim 1, characterized in that: The mortar rod chuck device includes a main shaft, a rotating disk, a grinding shaft, a pressure ring, clamping plates, and a clamping plate outer sleeve. The main shaft is vertically arranged and rotatably connected to the upper frame. The main shaft is driven by a third transmission assembly and a second transmission shaft. A rotating disk is installed at the lower end of the main shaft, and the rotating disk has multiple connecting holes. The grinding shaft is installed in the connecting holes. A drive disk is provided at the lower end of the grinding shaft. The drive disk has multiple radial sliding grooves. Multiple clamping plates are provided at the bottom of the drive disk. The clamping plates have an inverted frustum structure. The top of each clamping plate has a slider that passes through the sliding groove. The top of the slider has a sliding sleeve. The sliding sleeve is slidably connected to a horizontal sliding rod. The inner end of the sliding rod is fixed to the grinding shaft. A second spring is fitted on the sliding rod between the sliding sleeve and the grinding shaft. A clamping plate outer sleeve is fitted on the outside of the grinding shaft. A first spring is fitted on the grinding shaft between the top plate of the clamping plate outer sleeve and the drive disk. A connecting rod is provided at the bottom of the bottom plate of the clamping plate outer sleeve. A pressure ring is provided at the bottom of the connecting rod. The pressure ring is fitted on the outside of the clamping plates.

4. The automatic grinder according to claim 2, characterized in that: The first transmission component is a bevel gear assembly or a worm gear assembly, the second transmission component is a bevel gear assembly or a worm gear assembly, and the third transmission component is a bevel gear assembly or a worm gear assembly.

5. The automatic grinder according to claim 1, characterized in that: The mortar fixing device includes a fixed plate, a rotating plate, grippers, a fourth transmission assembly, and a third reduction motor. The fixed plate is mounted on the upper part of the machine base and has multiple radial first sliding holes. The rotating plate is placed at the bottom of the fixed plate and is rotatably connected to the machine base. The rotating plate has second sliding holes corresponding to the first sliding holes. The second sliding holes are arc-shaped and rotate in the same direction. The lower end of the grippers passes through the first and second sliding holes. The second reduction motor drives the rotating plate through the fourth transmission assembly.

6. The automatic grinder according to claim 5, characterized in that; The fourth transmission component is a bevel gear assembly or a worm gear assembly.

7. The automatic grinder according to claim 1, characterized in that: A positioning mechanism is provided between the upper guide sleeve and the machine base. The positioning mechanism includes a brake plate and a caliper disc brake. The brake plate is vertically mounted on the machine base, and the caliper disc brake is mounted on the upper guide sleeve.

8. The automatic grinder according to claim 1, characterized in that: The upper frame is a hollow structure, and the second drive shaft is located inside the upper frame.

9. The automatic grinder according to claim 2, characterized in that: The lower end of the first drive shaft is provided with a thrust bearing.

10. The automatic grinder according to claim 2, characterized in that: The second drive shaft is rotatably connected to the upper frame via a bearing housing.

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