Double-waveform elastic element bean grinder cutter head leveling gap control device and method

Abstract

The invention relates to the technical field of coffee bean grinders, in particular to a double-waveform elastic element bean grinder cutterhead leveling gap control device and method, and the device comprises a shell, an upper cutter adjusting seat and a levelness adjusting module; the levelness adjusting module comprises an adjusting ring, a plurality of adjusting screws, a pressing ring, a first double-waveform elastic element and an upper cutter mounting seat; a plurality of threaded holes are formed in the adjusting ring, and the adjusting screws are in threaded connection with the interiors of the threaded holes respectively; the pressing ring is arranged below the adjusting screws, and the tail of each adjusting screw abuts against the upper surface of the pressing ring. The first double-waveform elastic element is arranged between the pressing ring and the upper cutter adjusting seat; the upper cutter mounting seat is fixedly connected below the pressing ring; according to the leveling device, the double-waveform elastic element is adopted as a core elastic supporting and damping structure, and the problems that in an existing leveling mode, the leveling precision is low and the like are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of coffee grinder technology, and in particular to a device and method for controlling the leveling gap of the burr of a coffee grinder with dual-waveform elastic elements. Background Technology

[0002] In high-precision coffee grinders, precise control of the burr gap and dynamic parallelism adjustment between the burrs are crucial, directly affecting grind uniformity and product quality. However, since grinders are typically assembled from multiple machined parts, the machining tolerances of these parts accumulate during assembly, resulting in inherent deviations in the burr mounting surface. To compensate for this accumulated tolerance and achieve precise leveling, existing technologies mainly employ the following structures, but all have significant drawbacks: 1. Shim leveling structure The leveling process relies on manually adding or removing shims between the cutter head or related mounting surfaces. This method requires repeated parallelism testing after assembly and multiple disassemblies to adjust the number and position of shims. The operation is cumbersome, time-consuming, and experience-dependent, resulting in low leveling accuracy and efficiency, making it difficult to adapt to mass production and high-precision requirements.

[0003] 2. Coil spring leveling structure

[0004] Although this structure is low in cost, it has several shortcomings in design and application: Space versus cost conflict: Coil springs occupy a large design space. To accommodate the height and radial space required for installation, it is often necessary to increase the thickness of the outer cavity and the overall structural dimensions, which leads to increased material usage and higher actual manufacturing costs.

[0005] Poor leveling stability: When multiple leveling points are fixed together, uneven stress on the structure can easily cause the cutter head to tilt during tightening, leading to the failure of individual springs, resulting in a very small leveling range and unstable effect.

[0006] Insufficient vibration resistance and reliability: The spring has a weak ability to suppress high-frequency vibrations during the grinding process. After long-term use, it is prone to loosening or displacement due to vibration, resulting in changes in parallelism and requiring frequent readjustment.

[0007] Difficult to clean and maintain: Coffee powder tends to accumulate at the spring mounting location, making cleaning extremely inconvenient and affecting hygiene and service life.

[0008] 3. Plug (damping) spring leveling structure

[0009] While this structure offers better damping characteristics, it suffers from the following prominent problems: High cost: The plunger spring itself is expensive, and due to its large size and complex structure, it requires more design space and more precise machining of the internal cavity and mounting position, which leads to a significant increase in parts processing costs.

[0010] High assembly complexity: Numerous assembly processes further increase overall production costs and time.

[0011] Risk of jamming: During use, dust intrusion or misalignment may cause poor movement, affecting the leveling response speed and reliability.

[0012] In summary, existing coffee grinder leveling structures generally suffer from a series of problems, including limited leveling range, complex operation, low space utilization, poor vibration resistance, susceptibility to coffee powder contamination, high manufacturing costs, complex assembly, and difficulty in effectively compensating for the cumulative tolerances of multiple parts.

[0013] Therefore, there is an urgent need for a leveling device that is easy to operate and can fundamentally solve the problem of cutting head horizontal adjustment from a structural perspective. This is a technical challenge that urgently needs to be overcome in this field. Summary of the Invention

[0014] The purpose of this invention is to provide a device and method for controlling the leveling gap of the burr disc in a coffee grinder with a dual-waveform elastic element, so as to solve the problems mentioned in the background art.

[0015] To address the shortcomings of existing technologies, the technical solution adopted by this invention is as follows: a dual-waveform elastic element grinder blade leveling gap control device, comprising a housing, an upper blade adjusting seat disposed within the housing, and a leveling adjustment module for adjusting the parallelism between the upper and lower flat blades; the leveling adjustment module includes an adjusting ring fixedly connected to the upper blade adjusting seat, multiple adjusting screws, a pressure ring, a first dual-waveform elastic element, and an upper blade mounting base; the adjusting ring has multiple threaded holes evenly distributed along its circumference, and each adjusting screw is threaded into one of the threaded holes; the pressure ring is disposed below the adjusting screws, and the tail of each adjusting screw abuts against the upper surface of the pressure ring; the first dual-waveform elastic element is disposed between the pressure ring and the upper blade adjusting seat; the upper blade mounting base is fixedly connected below the pressure ring; wherein, independently rotating each adjusting screw can drive the pressure ring to partially rise and fall, and through the elastic support and overall force characteristics of the first dual-waveform elastic element, the upper blade mounting base and the upper flat blade mounted on the upper blade mounting base are driven to perform leveling adjustment.

[0016] Preferably, it further includes a height adjustment module for adjusting the overall height of the upper flat blade. The height adjustment module includes a height adjustment ring, a thrust bearing, and a second double-waveform elastic element. The height adjustment ring is threadedly connected to the inner wall of the housing. The thrust bearing is disposed between the height adjustment ring and the adjustment ring. The second double-waveform elastic element is disposed between the upper blade adjustment seat and the housing. Rotating the height adjustment ring pushes the adjustment ring and the upper blade adjustment seat fixed to the adjustment ring to move axially as a whole through the thrust bearing, so as to compress or release the second double-waveform elastic element, thereby realizing stepless adjustment of the gap between the upper and lower flat blades.

[0017] Preferably, both the first and second double-waveform elastic elements are wave washers.

[0018] Preferably, the pressure ring includes an integrally formed pressure ring one and pressure ring two, the lower surface of the pressure ring abuts against the first double-wave elastic element, and the pressure ring two is fixedly connected to the upper knife mounting seat by a screw one.

[0019] Preferably, the adjusting ring includes an integrally formed annular boss and an annular step, the threaded hole is formed on the annular boss, and the annular step is engaged with the upper tool adjusting seat and fixed by a countersunk screw.

[0020] Preferably, the upper blade adjusting seat includes an integrally formed base portion, a connecting portion, a first supporting boss, and a second supporting boss; the connecting portion extends upward and is engaged and fixed with the adjusting ring; the top surface of the first supporting boss is higher than the top surface of the second supporting boss, and a gap is provided between the top surface of the first supporting boss and the pressure ring; the first double-wave elastic element is disposed between the pressure ring and the top surface of the second supporting boss; the lower surface of the base portion abuts against the second double-wave elastic element.

[0021] Preferably, it also includes a lower blade mounting base, a motor, and a pressure block. The lower flat blade is mounted on the lower blade mounting base, the output shaft of the motor is connected to the lower flat blade, and the pressure block presses the lower blade mounting base onto the output shaft by two screws.

[0022] A method for controlling the leveling gap of a coffee grinder blade with a dual-waveform elastic element, characterized by comprising the following steps: S1: Gap coarse adjustment: Manually rotate the height adjustment ring to push the adjustment ring and the upper blade adjustment seat to move axially as a whole through the thrust bearing, compress or release the second double wave elastic element, drive the upper blade mounting seat and the upper flat blade to rise and fall as a whole, and initially set the grinding gap between the upper flat blade and the lower flat blade. S2: Horizontal fine adjustment: To address the parallelism deviation between the upper and lower flat blades, independently rotate the adjusting screw at the corresponding position, causing the tail of the adjusting screw to push or loosen the local position of the pressure ring. This forces the first double-wave elastic element set between the pressure ring and the upper blade adjusting seat to produce corresponding elastic deformation, thereby finely adjusting the posture of the upper blade mounting seat and the upper flat blade fixed to the pressure ring, so as to achieve dynamic parallelism between the upper and lower flat blades. S3: Gap fine-tuning and locking: After completing the leveling adjustment, fine-tune the height adjustment ring again to accurately set the final grinding gap, and keep all adjustment screws tightened. Use the preload of the first double-wave elastic element to maintain the leveling stability.

[0023] Preferably, in step S2, during the leveling adjustment process, the adjustment operations of each adjusting screw do not interfere with each other, and the overall force characteristics of the first double-wave elastic element ensure that the pressure adjustment of one adjustment point will not cause other adjustment points to lose force.

[0024] Preferably, during the operation of the coffee grinder, the first double-waveform elastic element and the second double-waveform elastic element together absorb the high-frequency vibration generated by grinding in order to maintain the leveling accuracy and gap stability.

[0025] The beneficial effects of this invention are as follows: By employing a dual-waveform elastic element as the core for leveling and support, combined with a highly integrated modular design, an integrated solution for grinder blade leveling and gap control is achieved. Regarding levelness adjustment, the overall force characteristics of the waveform elastic element ensure that each adjustment point does not interfere with the others, significantly expanding the leveling range and ensuring a stable and reliable leveling process, effectively avoiding the skewness and loss of force problems inherent in traditional multi-point spring structures. Simultaneously, the waveform elastic element possesses excellent damping performance, effectively absorbing high-frequency vibrations during the grinding process, maintaining long-term leveling stability, and reducing parallelism changes caused by vibration. Regarding height adjustment, the combination of the threaded pair and the waveform elastic element enables stepless and smooth adjustment of the blade gap, offering simple operation and high adjustment precision. The overall structure is compact, with high space utilization, significantly reducing the space requirements for the outer shell and internal structure, and reducing material and processing costs. The assembly process is simple, reducing stringent requirements for parts machining precision, and exhibiting good tolerance adaptability and mass production applicability. Furthermore, the waveform elastic element's simple structure and ease of cleaning prevent coffee powder accumulation, improving the hygiene and maintenance performance of the equipment. In summary, this invention has significant advantages in terms of leveling accuracy, ease of operation, compact structure, vibration resistance reliability, and manufacturing cost, and is particularly suitable for high-precision and high-reliability coffee grinder products. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 A cross-sectional diagram; Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0027] Explanation of reference numerals in the attached drawings: 1. Outer shell; 2. Upper blade adjustment seat; 21. Base part; 22. Connecting part; 23. First support boss; 24. Second support boss; 3. Upper flat blade; 4. Lower flat blade; 5. Levelness adjustment module; 51. Adjusting ring; 511. Threaded hole; 512. Annular boss; 513. Annular step; 52. Adjusting screw; 521. Adjusting spring; 53. Pressure ring; 531. Pressure ring one; 532. Pressure ring two; 54. First double-wave elastic element; 55. Upper blade mounting seat; 6. Height adjustment module; 61. Height adjustment ring; 62. Thrust bearing; 63. Second double-wave elastic element; 7. Screw one; 8. Countersunk screw; 9. Lower blade mounting seat; 10. Motor; 101. Output shaft; 11. Pressure block; 12. Screw two; 13. Bearing. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0029] like Figures 1 to 3 As shown, the present invention provides a dual-waveform elastic element coffee grinder blade leveling gap control device, including a housing 1, an upper blade adjustment seat 2 disposed in the housing 1, and a levelness adjustment module 5 for adjusting the parallelism between the upper flat blade 3 and the lower flat blade 4.

[0030] The levelness adjustment module 5 includes an adjustment ring 51 fixedly connected to the upper blade adjustment seat 2, multiple adjustment screws 52, a pressure ring 53, a first double-wave elastic element 54, and an upper blade mounting seat 55.

[0031] The adjusting ring 51 has multiple threaded holes 511 evenly distributed along its circumference; in this embodiment, four holes are preferred. An adjusting spring 521 is fitted onto the adjusting screw 52, ​​and each adjusting screw 52 is threaded into one of the threaded holes 511. The adjusting spring 521 provides a certain preload to prevent the adjusting screw 52 from loosening under vibration, while ensuring smooth force transmission during adjustment. The adjusting ring 51 includes an integrally formed annular boss 512 and an annular step 513. The threaded holes 511 are formed on the annular boss 512, and the annular step 513 is engaged with the upper tool adjusting seat 2 and fixed by countersunk screws 8.

[0032] A pressure ring 53 is positioned below the adjusting screws 52, with the tails of each adjusting screw 52 abutting against the upper surface of the pressure ring 53. The pressure ring 53 comprises an integrally formed pressure ring one 531 and pressure ring two 532. The lower surface of pressure ring one 531 abuts against the first double-wave elastic element 54, and pressure ring two 532 is fixedly connected to the upper blade mounting base 55 by screw one 7. A through hole is provided between pressure ring one 531 and pressure ring two 532 to facilitate the passage of screw one 7 and its connection to the upper blade mounting base 55.

[0033] The first double-wave elastic element 54 is disposed between the pressure ring 53 and the upper blade adjusting seat 2. The first double-wave elastic element 54 is preferably a wave washer, which has good elasticity and overall force-bearing characteristics. The upper blade mounting seat 55 is fixedly connected to the lower part of the pressure ring 53 and is used to mount the upper flat blade 3.

[0034] Independent rotation of each adjusting screw 52 can drive the pressure ring 53 to rise and fall locally. Through the elastic support and overall force characteristics of the first double-wave elastic element 54, the upper blade mounting base 55 and the upper flat blade 3 mounted on the upper blade mounting base 55 are driven to adjust the levelness. Specifically, when it is necessary to adjust the parallelism between the upper flat blade 3 and the lower flat blade 4, the adjusting screw 52 at the corresponding position can be rotated independently. When the adjusting screw 52 is screwed down, its tail pushes the corresponding point of the pressure ring 53 downward, compressing the first double-wave elastic element 54 at that point; conversely, when it is screwed up, the pressure at that point decreases, the first double-wave elastic element 54 recovers its elasticity, and pushes the pressure ring 53 upward. Since the first double-wave elastic element 54 is an integral force-bearing structure, the pressure change at one adjustment point will not cause other points to lose force, thereby achieving precise leveling without interference between the adjustment points.

[0035] The device also includes a height adjustment module 6 for adjusting the overall height of the upper flat blade 3 to control the grinding gap size. The height adjustment module 6 includes a height adjustment ring 61, a thrust bearing 62, and a second double-wave elastic element 63.

[0036] The height adjustment ring 61 is threaded to the inner wall of the outer casing 1 and can be raised or lowered by manual rotation. The thrust bearing 62 is located between the height adjustment ring 61 and the adjustment ring 51. Its function is to convert the rotational motion of the height adjustment ring 61 into the axial translation of the adjustment ring 51, while reducing friction and making the adjustment smoother.

[0037] The second double-wave elastic element 63 is disposed between the upper knife adjustment seat 2 and the outer shell 1. The second double-wave elastic element 63 is also preferably a wave washer, used to provide elastic support and absorb vibration.

[0038] The upper blade adjusting seat 2 is fixedly connected to the adjusting ring 51 by countersunk screws 8, forming an integral motion unit. The rotating height adjusting ring 61 pushes the adjusting ring 51 and the upper blade adjusting seat 2 fixed to the adjusting ring 51 to move axially as a whole through the thrust bearing 62, so as to compress or release the second double wave elastic element 63, thereby driving the upper blade mounting seat 55 and the upper flat blade 3 to rise and fall as a whole, realizing stepless adjustment of the gap between the upper flat blade 3 and the lower flat blade 4.

[0039] The upper blade adjusting seat 2 includes an integrally formed base portion 21, a connecting portion 22, a first support boss 23, and a second support boss 24. The connecting portion 22 extends upward and engages with the annular step 513 of the adjusting ring 51 for fixation.

[0040] The top surface of the first support boss 23 is higher than the top surface of the second support boss 24, and a 0.4mm gap is provided between the top surface of the first support boss 23 and the lower surface of the pressure ring 531. This gap design ensures that during leveling, the first support boss 23 mainly serves as a limit to prevent the pressure ring 531 from being excessively pressed down; while the second support boss 24 is used to support the first double-wave elastic element 54, providing the main elastic support and deformation space. The first double-wave elastic element 54 is disposed between the lower surface of the pressure ring 531 and the top surface of the second support boss 24, and the lower surface of the base portion 21 abuts against the second double-wave elastic element 63 to transmit axial force during height adjustment and maintain the stability of the overall structure.

[0041] The device also includes a lower blade mounting base 9, a motor 10, and a pressure block 11. The lower flat blade 4 is mounted on the lower blade mounting base 9, and the output shaft 101 of the motor 10 is connected to the lower flat blade 4 for transmission. The pressure block 11 presses the lower blade mounting base 9 onto the output shaft 101 with screws 12 to ensure that the lower flat blade 4 will not loosen when rotating at high speed. A bearing 13 is provided below the lower blade mounting base 9, and the bearing 13 is sleeved on the output shaft 101 of the motor 10 to ensure that the lower flat blade 4 rotates smoothly and with minimal vibration.

[0042] A method for controlling the leveling gap of a coffee grinder blade with a dual-waveform elastic element includes the following steps: S1: Coarse Grinding Gap Adjustment: Manually rotate the height adjustment ring 61, which pushes the adjustment ring 51 and the upper blade adjustment seat 2 to move axially as a whole through the thrust bearing 62. This compresses or releases the second double-wave elastic element 63, causing the upper blade mounting seat 55 and the upper flat blade 3 to rise and fall as a whole, thus initially setting the grinding gap between the upper flat blade 3 and the lower flat blade 4. This step is suitable for the initial setting of the grinding coarseness, is easy to operate, and has a wide adjustment range.

[0043] S2: Horizontal Fine-tuning: To address the parallelism deviation between the upper flat blade 3 and the lower flat blade 4, independently rotate the corresponding adjusting screw 52. This causes the tail of the adjusting screw 52 to push or loosen the local position of the pressure ring 53, forcing the first double-wave elastic element 54, located between the pressure ring 53 and the upper blade adjusting seat 2, to undergo corresponding elastic deformation. This fine-tunes the posture of the upper blade mounting seat 55, which is fixed to the pressure ring 53, and the upper flat blade 3, thereby achieving dynamic parallelism between the upper flat blade 3 and the lower flat blade 4. During the horizontal adjustment process, the adjustment operations of each adjusting screw 52 do not interfere with each other. The overall force characteristics of the first double-wave elastic element 54 ensure that adjusting the pressure at one adjustment point will not cause other adjustment points to lose force.

[0044] S3: Gap fine-tuning and locking: After the level adjustment is completed, the height adjustment ring 61 can be finely adjusted again to accurately set the final grinding gap, and the tightening state of each adjustment screw 52 is maintained. The preload of the first double wave elastic element 54 is used to maintain the leveling stability and prevent leveling failure due to vibration.

[0045] During the operation of the coffee grinder, the first double-wave elastic element 54 and the second double-wave elastic element 63 work together to absorb the high-frequency vibration generated by grinding, effectively suppressing vibration transmission to maintain leveling accuracy and gap stability.

[0046] This invention achieves the effects of non-interference between adjustment points, large adjustment range, and strong vibration resistance during the leveling process by using the elastic support of dual-wave elastic elements and the overall force characteristics. At the same time, it has a compact structure and is easy to assemble, reducing the dependence on the machining accuracy of parts and significantly improving the grinding accuracy and reliability of coffee grinders. It is especially suitable for high-precision, high-volume coffee grinders.

Claims

1. A dual-waveform elastic element coffee grinder blade leveling gap control device, characterized in that: The device includes a housing (1), an upper blade adjustment seat (2) disposed within the housing (1), and a leveling adjustment module (5) for adjusting the parallelism between the upper flat blade (3) and the lower flat blade (4). The leveling adjustment module (5) includes an adjustment ring (51) fixedly connected to the upper blade adjustment seat (2), multiple adjustment screws (52), a pressure ring (53), a first double-wave elastic element (54), and an upper blade mounting seat (55). The adjustment ring (51) has multiple threaded holes (511) evenly distributed along its circumference, and each adjustment screw (52) is threaded into the threaded hole (511). The pressure ring (53) The adjustment screws (52) are positioned below the adjustment screws (52), with the tails of each adjustment screw (52) abutting against the upper surface of the pressure ring (53); the first double-wave elastic element (54) is positioned between the pressure ring (53) and the upper blade adjustment seat (2); the upper blade mounting seat (55) is fixedly connected to the lower part of the pressure ring (53); wherein, independently rotating each adjustment screw (52) can push the pressure ring (53) to rise and fall locally, and through the elastic support and overall force characteristics of the first double-wave elastic element (54), the upper blade mounting seat (55) and the upper flat blade (3) mounted on the upper blade mounting seat (55) are driven to adjust the levelness.

2. The dual-waveform elastic element grinder blade leveling gap control device according to claim 1, characterized in that: It also includes a height adjustment module (6) for adjusting the overall height of the upper flat blade (3). The height adjustment module (6) includes a height adjustment ring (61), a thrust bearing (62), and a second double-wave elastic element (63). The height adjustment ring (61) is threadedly connected to the inner wall of the outer shell (1). The thrust bearing (62) is disposed between the height adjustment ring (61) and the adjustment ring (51). The second double-wave elastic element (63) is disposed between the upper blade adjustment seat (2) and the outer shell (1). The rotating height adjustment ring (61) pushes the adjustment ring (51) and the upper blade adjustment seat (2) fixed to the adjustment ring (51) to move axially as a whole through the thrust bearing (62) to compress or release the second double-wave elastic element (63) and realize stepless adjustment of the gap between the upper flat blade (3) and the lower flat blade (4).

3. The dual-waveform elastic element grinder blade leveling gap control device according to claim 2, characterized in that: Both the first double-waveform elastic element (54) and the second double-waveform elastic element (63) are waveform washers.

4. The dual-waveform elastic element grinder blade leveling gap control device according to claim 1, characterized in that: The pressure ring (53) includes an integrally formed pressure ring one (531) and pressure ring two (532). The lower surface of the pressure ring one (531) abuts against the first double-wave elastic element (54), and the pressure ring two (532) is fixedly connected to the upper knife mounting seat (55) by screw one (7).

5. The dual-waveform elastic element grinder blade leveling gap control device according to claim 1, characterized in that: The adjusting ring (51) includes an integrally formed annular boss (512) and an annular step (513). The threaded hole (511) is opened on the annular boss (512). The annular step (513) is engaged with the upper knife adjusting seat (2) and fixed by countersunk screws (8).

6. The dual-waveform elastic element grinder blade leveling gap control device according to claim 2, characterized in that: The upper knife adjustment seat (2) includes an integrally formed base part (21), a connecting part (22), a first support boss (23) and a second support boss (24); the connecting part (22) extends upward and is engaged and fixed with the adjustment ring (51); the top surface of the first support boss (23) is higher than the top surface of the second support boss (24), and there is a gap between the top surface of the first support boss (23) and the pressure ring (53); the first double wave elastic element (54) is disposed between the pressure ring (53) and the top surface of the second support boss (24); the lower surface of the base part (21) abuts against the second double wave elastic element (63).

7. The dual-waveform elastic element grinder blade leveling gap control device according to claim 1, characterized in that: It also includes a lower blade mounting base (9), a motor (10) and a pressure block (11). The lower flat blade (4) is mounted on the lower blade mounting base (9). The output shaft (101) of the motor (10) is connected to the lower flat blade (4) in a transmission. The pressure block (11) presses the lower blade mounting base (9) onto the output shaft (101) by screw two (12).

8. A method for controlling the leveling gap of a coffee grinder blade with dual-waveform elastic elements, characterized in that: Includes the following steps: S1: Gap coarse adjustment: Manually rotate the height adjustment ring (61), and push the adjustment ring (51) and the upper blade adjustment seat (2) to move axially as a whole through the thrust bearing (62), compress or release the second double wave elastic element (63), and drive the upper blade mounting seat (55) and the upper flat blade (3) to rise and fall as a whole, and initially set the grinding gap between the upper flat blade (3) and the lower flat blade (4); S2: Leveling adjustment: For the parallelism deviation between the upper flat blade (3) and the lower flat blade (4), the adjusting screw (52) at the corresponding position is rotated independently, so that the tail of the adjusting screw (52) pushes or loosens the local position of the pressure ring (53), forcing the first double wave elastic element (54) set between the pressure ring (53) and the upper blade adjusting seat (2) to produce corresponding elastic deformation, thereby finely adjusting the posture of the upper blade mounting seat (55) fixed with the pressure ring (53) and the upper flat blade (3) to achieve dynamic parallelism between the upper flat blade (3) and the lower flat blade (4); S3: Gap fine adjustment and locking: After completing the level adjustment, fine adjust the height adjustment ring (61) again to accurately set the final grinding gap, and keep the adjustment screws (52) tightened, using the preload of the first double wave elastic element (54) to maintain the leveling stability.

9. The method for controlling the leveling gap of the burr disc in a coffee grinder according to claim 8, characterized in that: In step S2, during the leveling adjustment process, the adjustment operations of each adjusting screw (52) do not interfere with each other, and the overall force characteristics of the first double-wave elastic element (54) ensure that the pressure adjustment of one adjustment point will not cause other adjustment points to lose force.

10. The method for controlling the leveling gap of the burr disc in a coffee grinder according to claim 8, characterized in that: During the operation of the coffee grinder, the first double-wave elastic element (54) and the second double-wave elastic element (63) jointly absorb the high-frequency vibration generated by grinding to maintain the leveling accuracy and gap stability.

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