Powder pressing device of automatic coffee machine and automatic coffee machine

Abstract

The utility model discloses a powder pressing device of an automatic coffee machine and the automatic coffee machine, the powder pressing device comprises a powder pressing motor, the powder pressing motor drives a powder pressing screw rod to move up and down through a secondary speed reduction device, and the bottom end of the powder pressing screw rod is a powder pressing head used for compacting coffee powder; the secondary speed reduction device comprises a driving pinion on an output shaft of the powder pressing motor, a middle large gear and a middle pinion which are coaxial, and a speed reduction large gear; the second-stage speed reduction device can transmit rotation from the powder pressing motor to the speed reduction bull gear after second-stage speed reduction; a threaded hole is formed in the reduction gearwheel; the powder pressing screw rod is matched in the threaded hole through threads; in this way, when the speed reduction large gear rotates forwards or reversely, the powder pressing screw rod can be driven to move up and down through thread fit.

Description

Technical Field

[0001] The utility model relates to an automatic coffee machine, in particular to a powder pressing device of the automatic coffee machine and the automatic coffee machine. Background Art

[0002] The coffee extraction units of the automatic coffee machines currently on the market have unstable pressing force, especially in the state of coarse powder and fine powder. It is difficult to control the degree of compaction of coffee powder when the coffee powder capacity is different. The coffee powder is difficult to be compacted every time, resulting in adverse phenomena such as channel effect in the extraction process, and the consistency of coffee product quality is poor. Utility Model Content

[0003] In view of the above-mentioned defects of the prior art, the utility model first provides a powder pressing device for an automatic coffee machine, including a powder pressing motor, which drives a powder pressing screw to move up and down through a two-stage reduction device, and the bottom end of the powder pressing screw is a powder pressing head for compacting coffee powder; the two-stage reduction device includes a driving pinion on the output shaft of the powder pressing motor, a coaxial intermediate large gear and the intermediate pinion, and a reduction large gear; the two-stage reduction device can transmit the rotation from the powder pressing motor to the reduction large gear after two-stage reduction; a threaded hole is provided in the reduction large gear; the powder pressing screw is threadedly engaged in the threaded hole; in this way, when the reduction large gear is rotated forward or reversely, the powder pressing screw can be driven to move up and down through thread engagement.

[0004] Furthermore, a Hall sensor is provided on the upper surface of the middle large gear for measuring the gear rotation speed.

[0005] Furthermore, a limiting guide groove is provided on the powder pressing screw, and a fixed guide head is provided outside the threaded hole; the fixed guide head is fitted in the limiting guide groove; when the powder pressing screw moves up and down, the fixed guide head slides up and down in the limiting guide groove, while limiting the circumferential movement of the powder pressing screw.

[0006] Furthermore, a limit frame is arranged beside the powder pressing screw, and an upper limit switch and a lower limit switch are arranged on the limit frame respectively; a trigger plate is arranged on the powder pressing screw to limit the powder pressing stroke of the powder pressing screw.

[0007] Furthermore, the threads of the powder pressing screw and the threaded hole are trapezoidal threads.

[0008] The utility model also provides an automatic coffee machine, which also includes the powder pressing device as described above.

[0009] In the utility model, the powder pressing motor accurately controls the up and down movement stroke of the powder pressing rod through a specially designed two-stage reducer. The trapezoidal transmission thread and the linear slide groove and other mechanisms arranged on the small-diameter powder pressing rod are conducive to the smooth up and down movement of the powder pressing rod to achieve the set powder pressing force. The powder pressing screw has high strength and small deformation and will not get stuck during transmission. The Hall sensor arranged on the middle large gear of the transmission can also be used to measure variables such as the total number of revolutions of the driving large gear, and the program can be used to accurately calculate the motor's downward pressure stroke value, thereby obtaining a stable powder pressing force.

[0010] The utility model also provides an automatic coffee machine, which, in addition to a brewing motor for completing processes such as powder filling, brewing, exhausting waste steam, waste water, pushing cakes, and dropping dregs, also includes the powder pressing motor and device as described above, which can control the downward pressing stroke of the motor in real time according to the actual amount of powder filled to obtain a stable powder pressing force.

[0011] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of a powder pressing device of an automatic coffee machine in a preferred embodiment of the utility model;

[0013] Figure 2 yes Figure 1 A schematic diagram of a transmission gear train of a powder pressing device;

[0014] Figure 3 yes Figure 2 Partial disassembly diagram of the transmission gear train;

[0015] Figure 4 yes Figure 1 Schematic diagram of the coordination between the limiting guide groove and the guide head of the powder pressing device;

[0016] Figure 5 yes Figure 1 Schematic diagram from another perspective. DETAILED DESCRIPTION

[0017] The following describes several preferred embodiments of the utility model with reference to the drawings in the specification, so that the technical content is clearer and easier to understand. The utility model can be embodied in many different forms of embodiments, and the protection scope of the utility model is not limited to the embodiments mentioned in the text.

[0018] like Figure 1 As shown, the powder compacting device of the automatic coffee machine according to the utility model includes a powder compacting motor 1, which drives a powder compacting screw 3 to move up and down through a secondary reduction device 4. The bottom end of the powder compacting screw 3 is a powder compacting head 2 for compacting coffee powder.

[0019] like Figure 2 As shown, the secondary reduction device 4 includes a driving pinion 5 on the output shaft of the powder compacting motor 1, a coaxial intermediate large gear 6 and an intermediate small gear 7, and a reduction large gear 8. The secondary reduction device 4 can transmit the rotation from the powder compacting motor 1 to the reduction large gear 8 after secondary reduction.

[0020] See also Figure 2 and Figure 3 , a threaded hole 9 is provided in the reduction gear 8. The powder pressing screw 3 is threadedly engaged in the threaded hole 9. In this way, when the reduction gear 8 is forward or reversed, the powder pressing screw 3 can be driven to move up and down by thread engagement. In a further embodiment, a Hall sensor 16 is provided on the upper surface of the intermediate gear 6, so that the total number of revolutions driven by the reduction gear 8 and other variables can be measured, so that the program can be used to accurately calculate the motor-driven powder pressing stroke value, thereby obtaining a stable powder pressing force such as 100N.

[0021] See also Figure 3 and Figure 4 A limited guide groove 14 is provided on the powder pressing screw 3, and a fixed guide head 15 is provided outside the threaded hole 9. The fixed guide head 15 fits in the limited guide groove 14. When the powder pressing screw 3 moves up and down, the fixed guide head slides up and down in the limited guide groove 14 to limit the circumferential movement of the powder pressing screw 3.

[0022] See also Figure 1 and Figure 5 A limit frame 13 is provided beside the powder pressing screw 3, and an upper limit switch 11 and a lower limit switch 12 are provided on the limit frame 13. A trigger plate 10 is provided on the powder pressing screw 3 to limit the powder pressing stroke of the powder pressing screw 3.

[0023] The threads of the powder pressing screw 3 and the threaded hole 9 are trapezoidal threads.

[0024] In the utility model, the powder pressing motor accurately controls the up and down movement stroke of the powder pressing rod through a specially designed two-stage reducer. The trapezoidal transmission thread and the linear slide groove and other mechanisms arranged on the small-diameter powder pressing rod are conducive to the smooth up and down movement of the powder pressing rod to achieve the set powder pressing force. The powder pressing screw has high strength and small deformation and will not get stuck during transmission. The Hall sensor arranged on the middle large gear of the transmission can also be used to measure variables such as the total number of revolutions of the driving large gear, and the program can be used to accurately calculate the motor's downward pressure stroke value, thereby obtaining a stable powder pressing force.

[0025] The utility model also provides an automatic coffee machine, which, in addition to a brewing motor for completing processes such as powder filling, brewing, exhausting waste steam, waste water, pushing cakes, and dropping dregs, also includes the powder pressing motor and device as described above, which can control the downward pressing stroke of the motor in real time according to the actual amount of powder filled to obtain a stable powder pressing force.

[0026] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A powder pressing device for an automatic coffee machine, characterized in that: It includes a powder pressing motor, which drives the powder pressing screw to move up and down through a two-stage reduction device. The bottom end of the powder pressing screw is a powder pressing head for compacting coffee powder. The two-stage reduction device includes a driving pinion on the output shaft of the powder pressing motor, a coaxial intermediate large gear and intermediate pinion, and a reduction large gear. The two-stage reduction device can transmit the rotation from the powder pressing motor to the reduction large gear after two-stage reduction. A threaded hole is provided in the reduction large gear. The powder pressing screw is threadedly engaged in the threaded hole. In this way, when the reduction large gear is rotated forward or reversely, the powder pressing screw can be driven to move up and down through the threaded engagement.

2. The powder pressing device of the automatic coffee machine according to claim 1, wherein: A Hall sensor is provided on the upper surface of the middle large gear to measure the gear speed.

3. The powder pressing device of the automatic coffee machine according to claim 1, wherein: A limiting guide groove is arranged on the powder pressing screw, and a fixed guide head is arranged outside the threaded hole; the fixed guide head fits in the limiting guide groove; when the powder pressing screw moves up and down, the fixed guide head slides up and down in the limiting guide groove, and at the same time limits the circumferential movement of the powder pressing screw.

4. The powder pressing device of the automatic coffee machine according to claim 1, wherein: A limit frame is arranged beside the powder pressing screw, and an upper limit switch and a lower limit switch are arranged on the limit frame respectively; a trigger plate is arranged on the powder pressing screw to limit the powder pressing stroke of the powder pressing screw.

5. The powder pressing device of the automatic coffee machine according to claim 1, wherein: The threads of the powder pressing screw and the threaded hole are trapezoidal threads.

6. An automatic coffee machine, characterized in that: It also includes a powder pressing device as described in any one of claims 1-5.

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