A motor speed regulation circuit for a food processor

Abstract

The utility model discloses a kind of motor speed regulation circuit for food processor, including circuit board, first spring piece, second spring piece, first copper foil area corresponding with first spring piece being equipped on circuit board, second copper foil area corresponding with second spring piece being equipped on circuit board and diode, first spring piece and second spring piece are fixed to circuit board in one end, other end is set as free end by oblique extension, first copper foil area and second copper foil area can be guaranteed to be located on the same horizontal plane after being fixed by the positioning of the upper surface of circuit board, ensure that first copper foil area and second copper foil area are located on the vertical height of design, guarantee the accuracy of user operation, simultaneously, first copper foil area and second copper foil area can be kept in original position by the effective support of circuit board to first copper foil area and second copper foil area vertically, to guarantee the reliability and accuracy of first spring piece and second spring piece and its contact.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, specifically to a motor speed control circuit for a food processing machine. Background Technology

[0002] Existing food processors, such as top-mounted meat grinders and dough mixers, typically include a main unit with a built-in motor and a cup assembly located below the main unit. The cup assembly includes a cup body containing a grinding device and a lid on top of the cup body. The grinding device is connected to the motor. When using the food processor, the user places the ingredients into the cup body, and the grinding device, driven by the motor, processes the ingredients. However, these more basic food processors can only achieve one speed output, meaning they can only process one type of food. To expand the applicability of food processors, Chinese patent CN201921782155.X discloses a main unit assembly and a food processor. This assembly includes a switch component for adjusting motor speed. The switch component comprises a first spring, a second spring, a circuit board, and a first and second lower contact on the circuit board. When processing different ingredients, the user can press the first spring to make it contact the first lower contact, outputting a higher speed for processing meat, nuts, carrots, etc.; pressing the second spring makes it contact the second lower contact, outputting a lower speed for processing fruits, onions, etc., meeting different user needs. However, this switch assembly involves fixing the spring to a bracket, while the first and second lower contacts are fixed to the circuit board. During long-term operation, motor vibration can cause the connection between the spring and the bracket to loosen, leading to spring displacement. This can result in misalignment between the spring and the lower contact, preventing effective contact and circuit continuity, causing the motor to malfunction.

[0003] With technological innovation, the structure of switch components is also constantly evolving. For example, Chinese patent CN110944462A discloses a PCB circuit board welding method and product with a metal spring switch. The PCB circuit board has a socket, and the spring has pins that engage with the socket. The spring is fixed to the circuit board through the engagement of the pins and the socket. A lower contact is fixed on the circuit board. This not only eliminates the step of fixing the spring to a bracket using a connector, but also ensures the stability of the spring's position, thereby improving the stable contact between the spring and the lower contact. Although this patent does not mention its application in food processing machines, those skilled in the art would readily consider applying this switch component to food processing machines to solve the problem of the stability of the spring-lower contact engagement. However, this type of switch assembly requires soldering a lower contact that protrudes from the upper surface of the circuit board. The actual process involves first drilling through holes in the circuit board, inserting the pins of the metal contact (i.e., the lower contact) into these holes, and then fixing it by spot welding. However, maintaining a consistent protruding height of the metal contact during spot welding is difficult, especially since the welding is done from the back of the circuit board. This causes the metal contact to protrude upwards, resulting in a floating height and upward movement. Consequently, if the user accidentally presses the button but it is not fully depressed, the machine may still start unintentionally, leading to a poor user experience. More importantly, the floating height during spot welding can cause some pins of the metal contact to be exposed. When the spring is pressed down, the metal contact may be under constant pressure, potentially causing the pins to bend or even break, leading to inaccurate triggering or failure to trigger. Utility Model Content

[0004] The purpose of this utility model is to provide a motor speed control circuit for a food processing machine, which solves the problem in the prior art where the metal contacts in the switch assembly float during the spot welding process to the circuit board, resulting in inconsistent heights of the metal contacts and exposed pins. This causes the metal contacts to deform under pressure after long-term use, making them prone to poor contact with the lower contact or inaccurate alignment, thus leading to the inability to make contact or poor contact.

[0005] To achieve the above objectives, this utility model provides a motor speed control circuit for a food processing machine. The motor of the food processing machine is electrically connected to the speed control circuit, which is used to adjust the motor speed. The speed control circuit includes:

[0006] The circuit board has a first spring, a second spring, a first copper foil area corresponding to the first spring, a second copper foil area corresponding to the second spring, and a diode. The first spring and the second spring are both fixed at one end to the circuit board and extended at an angle to be free ends.

[0007] One end of the diode is electrically connected to the first electrode of the power supply, and the other end is electrically connected to the second copper foil area; the first copper foil area is electrically connected to the first electrode, and the connection ends of the first and second springs fixed to the circuit board are both electrically connected to the second electrode of the power supply.

[0008] When the free end of the first spring is pressed and comes into contact with the first copper foil area, the two poles of the power supply are connected through the first copper foil area;

[0009] When the free end of the second spring is pressed and comes into contact with the second copper foil area, the two poles of the power supply are connected through the second copper foil area and the diode.

[0010] This application incorporates a speed control circuit for adjusting the motor, enabling users to control the motor's output speed at different speeds when using the food processor, thereby processing different ingredients and meeting diverse user needs.

[0011] The circuit board also includes a first spring, a second spring, a first copper foil area corresponding to the first spring, a second copper foil area corresponding to the second spring, and a diode. Both the first and second springs have one end fixed to the circuit board and the other end extended at an angle as a free end. One end of the diode is electrically connected to the first electrode of the power supply, and the other end is electrically connected to the second copper foil area. The first copper foil area is electrically connected to the first electrode. The connection ends of the first and second springs fixed to the circuit board are both electrically connected to the second electrode of the power supply. When the user needs a higher rotation speed to process food, they can press the first connecting rod on the first spring. The first link moves downward and drives the free end of the first spring to move downward until it contacts the first copper foil area. At this time, the two poles of the power supply are connected through the first copper foil area, thereby achieving high-speed output of the motor. When the user needs to process food at a lower speed, he can press the second link above the second spring. The second link moves downward and drives the free end of the second spring to move downward until it contacts the second copper foil area. At this time, the two poles of the power supply are connected through the second copper foil area and the diode. Under the action of the diode, the current is weakened, thereby reducing the current input to the motor and achieving low-speed output of the motor.

[0012] Furthermore, compared to existing methods that involve spot-soldering contacts onto a circuit board to achieve contact with the spring, this application directly etches copper foil onto the upper surface of the circuit board to form a first copper foil area and a second copper foil area. The first and second copper foil areas are essentially directly attached to the upper surface of the circuit board. The upper surface of the circuit board provides stable vertical support for the first and second copper foil areas, ensuring their positional stability. On one hand, the positioning of the first and second copper foil areas by the upper surface of the circuit board ensures that they are fixed on the same horizontal plane, guaranteeing that the first and second copper foil areas are at the designed vertical height, avoiding... Errors in the vertical height of the lower contact point caused by spot welding can lead to the machine starting prematurely when the user presses the linkage without fully engaging it, thus ensuring precise user operation. Furthermore, even with prolonged pressure on the first and second spring contacts, the circuit board effectively supports the vertical direction of the first and second copper foil areas, maintaining their original positions. This ensures reliable and precise contact between the spring contacts and the machine, effectively preventing displacement or even pin breakage of the lower contact point due to long-term use, which could cause inaccurate triggering or even failure to trigger. This guarantees the stability of the entire machine and helps extend its service life. Simultaneously, the etching process simplifies the production process compared to spot welding, reduces manufacturing costs, improves production efficiency, and enhances product reliability and durability.

[0013] Furthermore, compared to the existing lower contact method, the contact area between the first and second copper foil areas and the first and second springs is greatly increased, thereby increasing the probability of contact between the first and second springs and the first and second copper foil areas. This effectively avoids the situation where the first and second springs are misaligned vertically due to vibrations caused by the collision between the motor and the food during long-term operation, resulting in poor contact. This further ensures stable contact between the first and second springs and the first and second copper foil areas, ensuring that the motor can respond accurately under different operating conditions, improving the user experience, and extending the equipment life.

[0014] In a preferred embodiment of a motor speed control circuit for a food processing machine, the circuit board is further provided with a first conductive area and a second conductive area, a first copper foil area is provided on the first conductive area, a second copper foil area is provided on the second conductive area, the two ends of the diode are electrically connected to the first conductive area and the second conductive area respectively, and the first electrode is electrically connected to the first conductive area.

[0015] By configuring the two ends of the diode to be electrically connected to the first and second conductive regions respectively, and the first electrode to be electrically connected to the first conductive region, compared to the method of suspending one end of the diode and directly connecting it to the first electrode while the other end is electrically connected to the second conductive region, both ends of the diode can be fixed on the circuit board. This avoids the loosening problem caused by a single-point connection, further enhancing the stability of the circuit and ensuring the reliability and efficiency of current transmission. At the same time, it also reduces the wiring harness connecting the diode and the first electrode, simplifying the circuit layout, reducing the risk of failure caused by excessive wiring, improving the overall circuit neatness, facilitating wiring management and debugging for assembly personnel, and reducing assembly time and costs.

[0016] In a preferred embodiment of a motor speed control circuit for a food processing machine, both the first conductive region and the second conductive region include a copper foil layer and an insulating layer attached to the surface of the copper foil layer. The area of ​​the copper foil layer in the first conductive region that is not covered by the insulating layer is the first copper foil region, and the area of ​​the copper foil layer in the second conductive region that is not covered by the insulating layer is the second copper foil region.

[0017] By configuring the first conductive area and the second conductive area to both include a copper foil layer and an insulating layer attached to the surface of the copper foil layer, and defining the area of ​​the copper foil layer in the first conductive area not covered by the insulating layer as the first copper foil area, and the area of ​​the copper foil layer in the second conductive area not covered by the insulating layer as the second copper foil area, the copper foil layer can not only achieve a stable connection with the circuit board through the etching process, but also achieve a fixed connection with the circuit board through the insulating layer. This further enhances the bonding strength between the copper foil layer and the circuit board, effectively preventing poor contact caused by displacement due to long-term pressure, and ensuring the stability of the entire machine operation. At the same time, the insulating layer not only ensures the insulation of the copper foil layer from external components, but also achieves further fixation of the copper foil layer, serving two purposes and expanding the function of the insulating layer.

[0018] In a preferred embodiment of a motor speed control circuit for a food processing machine, the first spring and the second spring are connected as one unit through a connecting end, and the connecting end is electrically connected to the second pole.

[0019] By connecting the first and second spring contacts into a single unit via a connecting end that is electrically connected to the second electrode, the first and second spring contacts can be connected and fixed to the circuit board through only one connecting end. This eliminates the need for separate connecting ends on the first and second spring contacts, as well as the need for two connecting structures on the circuit board to connect to two terminals. This reduces the number of connection points and openings on the circuit board, helping to avoid excessively large circuit board areas or even damage caused by openings. It also helps to reduce the overall size of the circuit board, improve space utilization, and increase product yield. Furthermore, the fact that only a single wire harness is needed for electrical connection to the second electrode simplifies wiring, reduces assembly complexity, and further improves production efficiency.

[0020] In a preferred embodiment of a motor speed control circuit for a food processing machine, the connection end includes a connection plate and pins extending downward from the connection plate. The circuit board is provided with slots for pin insertion, and the bottom surface of the connection plate is clearance-fitted with the upper surface of the circuit board.

[0021] By including a connecting plate and pins extending downwards from the connecting plate, and with slots on the circuit board for pin insertion, the first and second spring contacts can achieve a stable connection with the circuit board through a simple pin-to-slot plug-in method. This avoids complex soldering processes, reducing production costs and assembly difficulty. Simultaneously, the bottom surface of the connecting plate and the top surface of the circuit board have a clearance fit. On one hand, this clearance fit increases the vertical height of the first and second spring contacts, making the distance between their free ends and the first and second copper foil areas greater. This increases the downward stroke of the first and second spring contacts when the connecting rod presses down, improving the pressing feel and optimizing the product experience. On the other hand, it isolates the connecting plate from the circuit board, creating a heat dissipation space between them. This effectively improves heat dissipation efficiency, preventing performance degradation or damage to the circuit board due to overheating during operation, extending the equipment's lifespan, and ensuring the stability and safety of the food processing machine under high load operation.

[0022] In a preferred embodiment of a motor speed control circuit for a food processing machine, the circuit board further includes a wiring area connected to a connection terminal. The wiring area has a socket for inserting a wire connected to the negative terminal of a power supply. The wiring area protrudes outward relative to the connection terminal and is offset relative to the second copper foil area; or...

[0023] The first and second springs have hollowed-out areas on both sides of the connecting end, and the pins of the connecting end are formed by bending down the spring body that closes the hollowed-out area.

[0024] By setting the wiring area to protrude outward relative to the connection end and offset relative to the second copper foil area, the creepage distance between the wiring area and the second copper foil area is greatly extended, effectively avoiding the risk of leakage due to insufficient creepage distance and improving electrical safety.

[0025] By providing hollowed-out areas on both sides of the connecting end on the first and second spring sheets, and forming the pins of the connecting end by bending the spring sheet body that closes the hollowed-out areas downwards, the first and second spring sheets can simultaneously extend at an angle from the connecting end to their free ends while also forming the pins of the connecting end on the spring sheets. This dual-purpose design helps reduce material consumption and simplify the production process. Simultaneously, the formation of the hollowed-out areas enhances the elasticity of the first and second spring sheets, improving their response sensitivity to the downward pressure of the connecting rod and further optimizing the operating feel.

[0026] In a preferred embodiment of a motor speed control circuit for a food processing machine, the first spring and the second spring are independently fixed on the circuit board, and one end of the first spring and one end of the second spring are electrically connected to the second pole, respectively.

[0027] In a preferred embodiment of a motor speed control circuit for a food processing machine, the speed control circuit further includes a fixing bracket for fixing the circuit board. The fixing bracket is provided with multiple vertically arranged insertion slots, and the circuit board can be selectively inserted and fixed into one of the insertion slots.

[0028] By providing multiple vertically arranged insertion slots on the fixed bracket, and allowing the circuit board to be selectively inserted into one of the slots for fixation, flexible installation and adjustment of the circuit board are achieved. This enables differentiated adjustment of the linkage pressing stroke after the circuit board is installed in different insertion slots, realizing multiple conduction strokes and accommodating the personalized needs of different types of models for conduction stroke, thus improving the applicability of the product.

[0029] In a preferred embodiment of a motor speed control circuit for a food processing machine, the diode is located upstream of the first and second spring contacts along the insertion direction of the insertion slot on the circuit board.

[0030] By placing the diode upstream of the first and second spring contacts, the diode will not interfere with the connecting rod when the circuit board is inserted into the insertion slot. This avoids the situation where the diode interferes with the connecting rod and prevents the circuit board from being installed properly when installing a model with a small pressing stroke.

[0031] In a preferred implementation of a motor speed control circuit for a food processing machine, the diode and both the first copper foil area and the second copper foil area are located on the upper surface of the circuit board; or,

[0032] The lower surfaces of the first and second springs are respectively provided with a first upper contact and a second upper contact. The first and second upper contacts are used to conduct electricity when they come into contact with the first and second copper foil areas, respectively. The vertical projection of the first upper contact falls completely within the first copper foil area, and the vertical projection of the second upper contact falls completely within the second copper foil area; or,

[0033] The first spring has a first upper contact, and the second spring has a second upper contact. The planar area S1 of the first upper contact and the planar area S1 of the first copper foil area are... * Satisfy: 3S1 < S1 * The planar area S2 of the second upper contact and the planar area S2 of the second copper foil area * Satisfy: 3S² < S² * ;or,

[0034] The first spring has a first upper contact, and the second spring has a second upper contact. The distance L1 from the first upper contact to the first copper foil area satisfies: 3mm≤L1≤8mm, and the distance L2 from the first upper contact to the first copper foil area satisfies: 3mm≤L2≤8mm.

[0035] By setting the diode, the first copper foil area, and the second copper foil area to be located on the upper surface of the circuit board, all electrical components on the circuit board are located on the upper surface of the circuit board. This not only facilitates the assembly of the circuit board but also reduces the overall vertical space occupied by the circuit board, further improving the compactness of the overall structure.

[0036] By setting the vertical projection of the first upper contact point to fall completely within the first copper foil area, and the vertical projection of the second upper contact point to fall completely within the second copper foil area, the first and second springs move downwards, ensuring that the first and second upper contacts fully contact the first and second copper foil areas. This guarantees reliable conduction between the first and second springs and the first and second copper foil areas, avoids poor contact caused by contact offset, and ensures the stability and safety of the circuit.

[0037] By comparing the planar area S1 of the first upper contact with the planar area S1 of the first copper foil area * Set to satisfy: 3S1 < S1 * The planar area S2 of the second upper contact and the planar area S2 of the second copper foil area * Satisfy: 3S² < S² * This effectively increases the contact probability between the contacts and the copper foil area. Even after long-term use, if the first or second spring is displaced, the first and second upper contacts can still maintain effective contact with the first and second copper foil areas, further improving the stability of the whole machine operation.

[0038] By setting the distance L1 from the first upper contact to the first copper foil area to satisfy: 3mm≤L1≤8mm, and the distance L2 from the first upper contact to the first copper foil area to satisfy: 3mm≤L2≤8mm, the distance between the contact and the copper foil area is ensured to be moderate, avoiding the situation of false connection caused by the contact being too close to the copper foil area; at the same time, it avoids the situation of the user's finger pressing the linkage too hard due to the distance between the contact and the copper foil area being too far, resulting in heavy finger fatigue during long-term work. Attached Figure Description

[0039] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0040] Figure 1This is a cross-sectional view of a food processing machine according to one embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of components such as the circuit board in one embodiment of the present invention;

[0042] Figure 3 This is a cross-sectional view of the circuit board and other components in Embodiment 1 of this utility model;

[0043] Figure 4 This is a top view of the circuit board and other components in Embodiment 1 of this utility model;

[0044] Figure 5 This is an exploded view of the circuit board and other components in Embodiment 1 of this utility model;

[0045] Figure 6 This is a schematic diagram of the structure of components such as connecting rods and brackets in Embodiment 1 of this utility model;

[0046] Figure 7 This is a schematic diagram of the structure of the connecting rod, bracket and other components when the second connecting rod is pressed down in Embodiment 1 of this utility model;

[0047] Figure 8 This is an exploded view of the connecting rod, bracket, and other components in Embodiment 1 of this utility model;

[0048] Figure 9 This is a schematic diagram of the speed regulation circuit in Embodiment 1 of this utility model;

[0049] Figure 10 This is a schematic diagram of the speed regulation circuit in Embodiment 2 of this utility model;

[0050] Figure 11 This is a schematic diagram of the speed regulation circuit in another embodiment of the present invention;

[0051] Figure 12 This is a schematic diagram of the structure of components such as connecting rods and brackets in Embodiment 2 of this utility model;

[0052] Figure 13 This is a schematic diagram of the speed control circuit in Embodiment 2 of this utility model.

[0053] List of components and reference numerals:

[0054] 1-Main unit; 2-Motor; 3-Cup body assembly; 31-Cup lid; 32-Cup body; 33-Crushing device; 4-Circuit board; 41-Slot; 42-Wiring area; 421-Socket; 5-Diode; 6-Spring; 61-First spring; 611-First upper contact; 62-Second spring; 621-Second upper contact; 63-Cutout area; 7-First copper foil area; 71-First conductive area; 8-Second copper foil area; 81-Second conductive area; 9-Connecting end; 91-Connecting plate; 92-Pin; 921-Abutting section; 922-Insertion section; 10-Connecting rod; 101-First connecting rod; 102-Second connecting rod; 11-Bracket; 111-Socket slot; 12-First pole; 13-Second pole. Detailed Implementation

[0055] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0056] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0057] like Figures 1 to 13 As shown, this utility model provides a motor speed control circuit for a food processing machine. The motor 2 of the food processing machine is electrically connected to the speed control circuit, which is used to adjust the speed of the motor 2. The speed control circuit includes:

[0058] The circuit board 4 is provided with a first spring 61, a second spring 62, a first copper foil area 7 corresponding to the first spring 61, a second copper foil area 8 corresponding to the second spring 62, and a diode 5. The first spring 61 and the second spring 62 are both fixed at one end on the circuit board 4 and extended at the other end as free ends.

[0059] One end of diode 5 is electrically connected to the first terminal 12 of the power supply, and the other end is electrically connected to the second copper foil area 8; the first copper foil area 7 is electrically connected to the first terminal 12, and the connection ends 9 of the first spring 61 and the second spring 62 fixed to the circuit board 4 are both electrically connected to the second terminal 13 of the power supply.

[0060] When the free end of the first spring 61 is pressed and comes into contact with the first copper foil area 7, the two poles of the power supply are connected through the first copper foil area 7.

[0061] When the free end of the second spring 62 is pressed and comes into contact with the second copper foil area 8, the two poles of the power supply are connected through the second copper foil area 8 and the diode 5.

[0062] Specifically, the food processing machine includes a main unit 1, a motor 2 inside the main unit 1, a cup assembly 3 located below the main unit 1, and a cup body assembly 3 including a cup body 32 containing a crushing device 33 and a cup lid 31 located above the cup body 32. The crushing device 33 is connected to the motor 2 in a transmission connection.

[0063] This application provides a speed control circuit for adjusting the motor 2, enabling users to control the output speed of the motor 2 at different speeds when using the food processor, thereby processing different ingredients and meeting different user needs.

[0064] Meanwhile, the circuit board 4 is equipped with a first spring contact 61, a second spring contact 62, a first copper foil area 7 corresponding to the first spring contact 61, a second copper foil area 8 corresponding to the second spring contact 62, and a diode 5. One end of the first spring contact 61 and the second spring contact 62 are fixed to the circuit board 4, while the other end extends at an angle as a free end. One end of the diode 5 is electrically connected to the first terminal 12 of the power supply, and the other end is electrically connected to the second copper foil area 8. The first copper foil area 7 is electrically connected to the first terminal 12. The connection ends 9 of the first spring contact 61 and the second spring contact 62, which are fixed to the circuit board 4, are both electrically connected to the second terminal 13 of the power supply. When the user needs a higher rotation speed to process food, they can press the first spring contact 61... A first link 101 moves downward and drives the free end of the first spring 61 to move downward until it abuts against the first copper foil area 7. At this time, the two poles of the power supply are connected through the first copper foil area 7, thereby realizing the high-speed output of the motor 2. When the user needs to process food at a lower speed, he can press the second link 102 above the second spring 62. The second link 102 moves downward and drives the free end of the second spring 62 to move downward until it abuts against the second copper foil area 8. At this time, the two poles of the power supply are connected through the second copper foil area 8 and the diode 5. Under the action of the diode 5, the current is weakened, thereby reducing the current input to the motor 2, and thus realizing the low-speed output of the motor 2.

[0065] Specifically, when a user is cutting and shredding meat, after a larger piece of meat is placed into the cup 32, the two poles of the power supply can be turned on through the second copper foil area 8 and the diode 5 by pressing the second connecting rod 102. The shredding device 33 outputs a lower speed to cut the larger piece of meat into smaller pieces. After the meat is cut into smaller pieces, the first connecting rod 101 is pressed again, and the two poles of the power supply are turned on through the first copper foil area 7. The shredding device 33 outputs a higher speed to quickly cut the smaller pieces of meat into minced meat.

[0066] Furthermore, compared to the existing method of spot-soldering contacts onto the circuit board 4 to achieve contact with the spring 6, this application directly etches copper foil on the upper surface of the circuit board 4 to form a first copper foil area 7 and a second copper foil area 8. The first copper foil area 7 and the second copper foil area 8 are essentially directly attached to the upper surface of the circuit board 4. The upper surface of the circuit board 4 provides stable vertical support for the first copper foil area 7 and the second copper foil area 8, ensuring the stability of their positions. On the one hand, the positioning of the first copper foil area 7 and the second copper foil area 8 with the help of the upper surface of the circuit board 4 ensures that they are fixed on the same horizontal plane, ensuring that the first copper foil area 7 and the second copper foil area 8 are at the designed vertical height, avoiding the influence of... The vertical height error of the lower contact point caused by spot welding error can lead to the machine starting before the user presses the linkage 10 fully, ensuring the accuracy and safety of user operation. On the other hand, even when the first spring 61 and the second spring 62 are pressed down for a long time, the circuit board 4 effectively supports the first copper foil area 7 and the second copper foil area 8 vertically, ensuring that the first copper foil area 7 and the second copper foil area 8 can still maintain their original positions. This ensures the reliability and accuracy of the contact between the first spring 61 and the second spring 62 and the contact point, effectively avoiding the situation where the lower contact point is displaced due to long-term use or even the pin 92 breaks, resulting in inaccurate triggering or even failure to trigger. This ensures the stability of the entire machine's operation and helps extend its service life. At the same time, the etching process simplifies the production process compared to spot welding, reduces manufacturing costs, helps improve production efficiency, and improves the reliability and durability of the product.

[0067] Furthermore, compared to the existing lower contact method, the contact area between the first copper foil area 7 and the second copper foil area 8 and the first spring 61 and the second spring 62 is greatly increased. This increases the probability of the first spring 61 and the second spring 62 contacting the first copper foil area 7 and the second copper foil area 8, effectively avoiding the situation where the first spring 61 and the second spring 62 are misaligned vertically due to the vibration caused by the collision between the motor 2 and the food during long-term operation of the machine, resulting in poor contact. This further ensures stable contact between the first spring 61 and the second spring 62 and the first copper foil area 7 and the second copper foil area 8, ensuring that the motor 2 can respond accurately under different working conditions, improving the user experience and extending the equipment life.

[0068] It should be noted that this application does not specifically limit the connection relationship between diode 5 and the power supply. As a preferred embodiment of this application, such as... Figure 2 , Figure 3 , Figure 9As shown, the circuit board 4 is also provided with a first conductive area 71 and a second conductive area 81. The first copper foil area 7 is provided on the first conductive area 71, the second copper foil area 8 is provided on the second conductive area 81, the two ends of the diode 5 are electrically connected to the first conductive area 71 and the second conductive area 81 respectively, and the first electrode 12 is electrically connected to the first conductive area 71.

[0069] By configuring the two ends of diode 5 to be electrically connected to the first conductive region 71 and the second conductive region 81 respectively, and the first electrode 12 to be electrically connected to the first conductive region 71, compared to the method of suspending one end of diode 5 and directly connecting it to the first electrode 12 and the other end to the second conductive region 81, both ends of diode 5 can be fixed on the circuit board 4, avoiding the loosening problem caused by a single point connection, further enhancing the stability of the circuit, and ensuring the reliability and efficiency of current transmission. At the same time, it can also reduce the wiring harness connecting diode 5 and the first electrode 12, simplifying the circuit layout, reducing the risk of failure caused by too many wiring harnesses, improving the overall circuit neatness, facilitating wiring management and debugging by assembly personnel, and reducing assembly time and cost.

[0070] Furthermore, both the first conductive region 71 and the second conductive region 81 include a copper foil layer and an insulating layer attached to the surface of the copper foil layer. The area of ​​the copper foil layer in the first conductive region 71 that is not covered by the insulating layer is the first copper foil region 7, and the area of ​​the copper foil layer in the second conductive region 81 that is not covered by the insulating layer is the second copper foil region 8.

[0071] By configuring the first conductive region 71 and the second conductive region 81 to both include a copper foil layer and an insulating layer attached to the surface of the copper foil layer, and defining the area of ​​the copper foil layer in the first conductive region 71 not covered by the insulating layer as the first copper foil region 7, and the area of ​​the copper foil layer in the second conductive region 81 not covered by the insulating layer as the second copper foil region 8, the copper foil layer can not only achieve a stable connection with the circuit board 4 through the etching process, but also achieve a fixed connection with the circuit board 4 through the insulating layer. This further enhances the bonding strength between the copper foil layer and the circuit board 4, effectively preventing poor contact caused by displacement due to long-term pressure, and ensuring the stability of the entire machine operation. At the same time, the insulating layer not only ensures the insulation of the copper foil layer from external components, but also achieves further fixation of the copper foil layer, serving two purposes and expanding the effect of the insulating layer.

[0072] Of course, the connection between diode 5 and the power supply is not limited to the above settings, such as... Figure 11 As shown, it can also be that the circuit board 4 is provided with a first conductive area 71 and a second conductive area 81, the first copper foil area 7 is provided on the first conductive area 71, the second copper foil area 8 is provided on the second conductive area 81, one end of the diode 5 is connected to the second conductive area 81, and the other end is connected to the first electrode 12. At the same time, the first electrode 12 is also electrically connected to the first conductive area 71.

[0073] Furthermore, the forming of the first copper foil area 7 and the second copper foil area 8 is not limited to the above-mentioned arrangement. As shown in the figure, it can also be that a copper foil layer is set on the circuit board 4, and the copper foil layer is completely exposed on the circuit board 4. The first copper foil area 7 and the second copper foil area 8 are then copper foil layers, and the two ends of the diode 5 are directly connected to the first copper foil area 7 and the second copper foil area 8, which can reduce the setting area of ​​the copper foil layer and thus reduce the production cost.

[0074] It should be noted that this application does not specifically limit how the first spring 61 and the second spring 62 are connected to the circuit board 4, and it can be any of the following embodiments:

[0075] Example 1: As Figures 2 to 10 As shown, in this embodiment, the first spring 61 and the second spring 62 are connected as one unit through the connecting end 9, and the connecting end 9 is electrically connected to the second pole 13.

[0076] By connecting the first spring contact 61 and the second spring contact 62 into one unit via the connecting end 9, and electrically connecting the connecting end 9 to the second pole 13, the first spring contact 61 and the second spring contact 62 can be connected and fixed to the circuit board 4 through only one connecting end 9. This eliminates the need for separate connecting ends 9 on the first spring contact 61 and the second spring contact 62 to connect to the circuit board 4, and also eliminates the need for two connection structures on the circuit board 4 to connect to two connecting ends 9. This reduces the number of connection points and the number of openings on the circuit board 4, thus helping to avoid the circuit board 4 becoming too large or even damaged due to openings. It also helps to reduce the overall size of the circuit board 4, improve space utilization, and increase product yield. Moreover, the fact that only one wire harness is needed to achieve electrical connection with the second pole 13 simplifies wiring, reduces assembly complexity, and further improves production efficiency.

[0077] Furthermore, such as Figure 3 As shown, the connection end 9 includes a connection plate 91 and pins 92 extending downward from the connection plate 91. The circuit board 4 is provided with a slot 41 for the pins 92 to be inserted. The bottom surface of the connection plate 91 is clearance-fitted with the upper surface of the circuit board 4.

[0078] By including a connecting plate 91 and pins 92 extending downward from the connecting plate 91, and providing a slot 41 on the circuit board 4 for the pins 92 to be inserted, the first spring 61 and the second spring 62 can be stably connected to the circuit board 4 through a simple insertion method of the pins 92 and the slot 41, avoiding complex soldering processes and reducing production costs and assembly difficulty. Meanwhile, the bottom surface of the connecting plate 91 and the upper surface of the circuit board 4 are fitted with a clearance fit. On the one hand, the clearance fit raises the vertical height of the first spring 61 and the second spring 62, making the free ends of the first spring 61 and the second spring 62 farther away from the first copper foil area 7 and the second copper foil area 8. This increases the downward stroke of the first spring 61 and the second spring 62 when the connecting rod 10 presses down on the spring 6, improving the pressing feel and optimizing the product experience. On the other hand, it isolates the connecting plate 91 from the circuit board 4, creating a heat dissipation space between the circuit board 4 and the connecting plate 91. This effectively improves heat dissipation efficiency, effectively prevents the circuit board 4 from experiencing performance degradation or damage due to excessive temperature during operation, extends the service life of the equipment, and ensures the stability and safety of the food processing machine under high load operation.

[0079] Specifically, such as Figure 3 As shown, pin 92 includes an abutment section 921 connected to the connecting plate 91 and an insertion section 922 connected to the abutment section 921 with a reduced outer diameter. The insertion section 922 is inserted into the slot 41, and the bottom wall of the abutment section 921 abuts against the upper surface of the circuit board 4. The abutment section 921 provides axial support and limits the connecting plate 91, thereby achieving a clearance fit between the bottom surface of the connecting plate 91 and the upper surface of the circuit board 4.

[0080] As a preferred embodiment, such as Figure 4 As shown, the circuit board 4 also includes a wiring area 42 connected to the connection terminal 9. The wiring area 42 is provided with a socket 421 for inserting a wire connected to the negative terminal of the power supply. The wiring area 42 protrudes outward relative to the connection terminal 9 and is offset relative to the second copper foil area 8.

[0081] By setting the wiring area 42 to protrude outward relative to the connection end 9 and offset relative to the second copper foil area 8, the creepage distance between the wiring area 42 and the second copper foil area 8 is greatly extended, effectively avoiding the risk of leakage due to excessively short creepage distance and improving electrical safety.

[0082] It should be further noted that this application does not specifically limit the shaping of the pin 92 of the connection terminal 9 in this embodiment. As a preferred embodiment, such as Figure 2 As shown, the first spring 61 and the second spring 62 are provided with hollow areas 63 located on both sides of the connecting end 9, and the pin 92 of the connecting end 9 is formed by bending down the body of the spring 6 that closes the hollow area 63.

[0083] By providing hollow areas 63 on both sides of the connecting end 9 on the first spring 61 and the second spring 62, and forming the pins 92 of the connecting end 9 by bending the body of the spring 6 that closes the hollow areas 63, the first spring 61 and the second spring 62 can extend at an angle from the connecting end 9 to their free ends, while the pins 92 of the connecting end 9 can also be formed on the spring 6. This dual-purpose design helps reduce material consumption and simplify the production process. At the same time, the formation of the hollow areas 63 enhances the elasticity of the first spring 61 and the second spring 62, improving the response sensitivity of the spring 6 to the downward pressure of the connecting rod 10, and further optimizing the operating feel.

[0084] Of course, the pin 92 of connector 9 is not limited to the above settings, such as... Figure 3 , Figure 5 As shown, it can also be that the pins 92 are bent downwards separately formed on both sides of the connecting plate 91, and the pins 92 are inserted into the slot 41.

[0085] This application does not specifically limit the connection method of diode 5 in this embodiment, which can be any of the following embodiments:

[0086] Implementation method 1: such as Figures 3 to 9 As shown, in this embodiment, the circuit board 4 is further provided with a first conductive area 71 and a second conductive area 81. A first copper foil area 7 is disposed on the first conductive area 71, and a second copper foil area 8 is disposed on the second conductive area 81. The two ends of the diode 5 are electrically connected to the first conductive area 71 and the second conductive area 81, respectively, and the first electrode 12 is electrically connected to the first conductive area 71. When the user presses the first connecting rod 101, the first connecting rod 101 drives the first spring 61 to press down, so that the first spring 61 abuts against the first copper foil area 7, and the two poles of the power supply are connected through the first conductive area 71. When the user presses the second connecting rod 102, the second connecting rod 102 drives the second spring 62 to press down, so that the second spring 62 abuts against the second copper foil area 8, and the two poles of the power supply are connected through the first conductive area 71, the diode 5, and the second conductive area 81.

[0087] Implementation method 2: such as Figure 10 As shown, in this embodiment, the circuit board 4 is further provided with a first conductive area 71 and a second conductive area 81. A first copper foil area 7 is disposed on the first conductive area 71, and a second copper foil area 8 is disposed on the second conductive area 81. One end of the diode 5 is connected to the second conductive area 81, and the other end is connected to the first electrode 12. At the same time, the first electrode 12 is also electrically connected to the first conductive area 71. When the user presses the first connecting rod 101, the first connecting rod 101 drives the first spring 61 to press down, so that the first spring 61 abuts against the first copper foil area 7, and the two poles of the power supply are connected through the first conductive area 71. When the user presses the second connecting rod 102, the second connecting rod 102 drives the second spring 62 to press down, so that the second spring 62 abuts against the second copper foil area 8, and the two poles of the power supply are connected through the diode 5 and the second conductive area 81.

[0088] Example 2: As Figure 12 , Figure 13 As shown, in this embodiment, the first spring 61 and the second spring 62 are independently fixed on the circuit board 4, and one end of the first spring 61 and one end of the second spring 62 are electrically connected to the second pole 13 respectively.

[0089] Furthermore, such as Figure 12 As shown, the connection ends 9 of the first spring contact 61 and the second spring contact 62 to the circuit board 4 are located on opposite sides of the length of the circuit board 4. The free ends of the first spring contact 61 and the second spring contact 62 extend inward at an inward angle. The first copper foil area 7 and the second copper foil area 8 are both located in the middle of the circuit board 4. More preferably, as shown in the figure, the first copper foil area 7 and the second copper foil area 8 can be set as one piece, which simplifies the layout of the two copper foil areas and further improves the assembly efficiency. In this embodiment, one end of the first spring contact 61 is connected to the first electrode 12, and the other end can abut against the first copper foil area 7. One end of the diode 5 is connected to the first electrode 12, and the other end is connected to the second spring contact 62. At the same time, the first copper foil area 7 and the second copper foil area 8 are both connected to the second electrode 13.

[0090] As a preferred embodiment of this application, such as Figure 6 As shown, the host 1 is provided with a fixing bracket 11 for fixing the circuit board 4. The fixing bracket 11 is provided with multiple vertically arranged plug slots 111. The circuit board 4 can be selected to be plugged into and fixed in one of the plug slots 111.

[0091] By providing multiple vertically arranged insertion slots 111 on the fixed bracket 11, and allowing the circuit board 4 to be selectively inserted and fixed into one of the insertion slots 111, flexible installation and adjustment of the circuit board 4 can be achieved. This enables differentiated adjustment of the pressing stroke of the connecting rod 10 after the circuit board 4 is installed in different insertion slots 111, realizing multiple conduction strokes, and accommodating the personalized needs of different types of models for conduction stroke, thereby improving the applicability of the product.

[0092] Specifically, when the circuit board 4 is installed in a model that requires a larger pressing stroke, the circuit board 4 is installed in the lower insertion slot 111 to extend the distance between the connecting rod 10 and the spring 6, thereby extending the pressing stroke; when the circuit board 4 is installed in a model that requires a smaller pressing stroke, the circuit board 4 is installed in the upper insertion slot 111 to shorten the distance between the connecting rod 10 and the spring 6, thereby shortening the pressing stroke.

[0093] Furthermore, such as Figure 6 As shown, along the insertion direction of the insertion slot 111 of the circuit board 4, the diode 5 is located upstream of the first spring 61 and the second spring 62.

[0094] By positioning the diode 5 upstream of the first spring 61 and the second spring 62, the diode 5 will not interfere with the connecting rod 10 when the circuit board 4 is inserted into the insertion slot 111. This avoids the situation where the diode 5 interferes with the connecting rod 10, causing the circuit board 4 to fail to be installed properly, especially in models with a small pressing stroke.

[0095] As a preferred embodiment of this application, such as Figure 2 As shown, diode 5, the first copper foil area 7, and the second copper foil area 8 are all located on the upper surface of circuit board 4.

[0096] By setting the diode 5, the first copper foil area 7, and the second copper foil area 8 all on the upper surface of the circuit board 4, the electrical components on the circuit board 4 are all located on the upper surface of the circuit board 4. This not only facilitates the assembly of the circuit board 4, but also reduces the vertical space occupied by the circuit board 4 as a whole, further improving the compactness of the overall structure.

[0097] As a preferred embodiment of this application, such as Figure 3 As shown, the lower surfaces of the first spring 61 and the second spring 62 are respectively provided with a first upper contact 611 and a second upper contact 621. The first upper contact 611 and the second upper contact 621 are respectively used to conduct electricity when they come into contact with the first copper foil area 7 and the second copper foil area 8.

[0098] As a preferred embodiment of this implementation, such as Figure 3 , Figure 4 As shown, the vertical projection of the first upper contact 611 falls completely within the first copper foil area 7, and the vertical projection of the second upper contact 621 falls completely within the second copper foil area 8.

[0099] By setting the vertical projection of the first upper contact 611 to fall completely within the first copper foil area 7, and the vertical projection of the second upper contact 621 to fall completely within the second copper foil area 8, the first spring 61 and the second spring 62 move downwards, so that the first upper contact 611 and the second upper contact 621 can fully abut against the first copper foil area 7 and the second copper foil area 8, ensuring reliable conduction between the first spring 61 and the second spring 62 and the first copper foil area 7 and the second copper foil area 8, avoiding poor contact problems caused by contact offset, and ensuring the stability and safety of the circuit.

[0100] As a preferred embodiment of this implementation, such as Figure 3 As shown, the planar area S1 of the first upper contact 611 and the planar area S1 of the first copper foil area 7 * Satisfy: 3S1 < S1 * The planar area S2 of the second upper contact 621 and the planar area S2 of the second copper foil area 8 * Satisfy: 3S² < S² *Even better, S1 * =4S1, 5S1, or 6S1; S2 * =4S2, 5S2 or 6S2.

[0101] By comparing the planar area S1 of the first upper contact 611 with the planar area S1 of the first copper foil area 7 * Set to satisfy: 3S1 < S1 * The planar area S2 of the second upper contact 621 and the planar area S2 of the second copper foil area 8 * Satisfy: 3S² < S² * This effectively increases the contact probability between the contacts and the copper foil area. Even if the first spring 61 or the second spring 62 shifts position after long-term use, the first upper contact 611 and the second upper contact 621 can still maintain effective contact with the first copper foil area 7 and the second copper foil area 8, further improving the stability of the whole machine operation.

[0102] As a preferred embodiment of this implementation, such as Figure 3 As shown, the distance L1 from the first upper contact 611 to the first copper foil area 7 satisfies: 3mm≤L1≤8mm, and the distance L2 from the first upper contact 611 to the first copper foil area 7 satisfies: 3mm≤L2≤8mm. More preferably, L1 is 4mm, 6mm or 8mm; and L2 is 4mm, 6mm or 8mm.

[0103] By setting the distance L1 from the first upper contact 611 to the first copper foil area 7 to satisfy: 3mm≤L1≤8mm, and the distance L2 from the first upper contact 611 to the first copper foil area 7 to satisfy: 3mm≤L2≤8mm, the distance between the contact and the copper foil area is ensured to be moderate, avoiding the situation of false connection caused by the contact being too close to the copper foil area; at the same time, it avoids the situation where the distance between the contact and the copper foil area is too far, causing the user's finger to press the linkage 10 with greater force, resulting in heavy finger fatigue during long-term work.

[0104] The technical solutions protected by this utility model are not limited to the above embodiments. It should be noted that any combination of the technical solutions of any embodiment with one or more other embodiments is within the protection scope of this utility model. Although this utility model has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A motor speed control circuit for a food processing machine, characterized in that, The motor of the food processing machine is electrically connected to the speed control circuit, which is used to adjust the speed of the motor. The speed control circuit includes: The circuit board is provided with a first spring, a second spring, a first copper foil area corresponding to the first spring, a second copper foil area corresponding to the second spring, and a diode. The first spring and the second spring are both fixed at one end to the circuit board and extended at an angle to be free ends. One end of the diode is electrically connected to the first electrode of the power supply, and the other end is electrically connected to the second copper foil area; the first copper foil area is electrically connected to the first electrode, and the connection ends of the first and second springs fixed to the circuit board are both electrically connected to the second electrode of the power supply. When the free end of the first spring is pressed and comes into contact with the first copper foil area, the two poles of the power supply are connected through the first copper foil area; When the free end of the second spring is pressed and comes into contact with the second copper foil area, the two poles of the power supply are connected through the second copper foil area and the diode.

2. The speed control circuit for a motor in a food processing machine according to claim 1, characterized in that, The circuit board is also provided with a first conductive area and a second conductive area. The first copper foil area is disposed on the first conductive area, and the second copper foil area is disposed on the second conductive area. The two ends of the diode are electrically connected to the first conductive area and the second conductive area respectively, and the first electrode is electrically connected to the first conductive area.

3. The speed control circuit for a motor in a food processing machine according to claim 2, characterized in that, Both the first conductive region and the second conductive region include a copper foil layer and an insulating layer attached to the surface of the copper foil layer. The area of ​​the copper foil layer in the first conductive region that is not covered by the insulating layer is the first copper foil region, and the area of ​​the copper foil layer in the second conductive region that is not covered by the insulating layer is the second copper foil region.

4. The speed control circuit for a motor in a food processing machine according to claim 1, characterized in that, The first spring and the second spring are connected as one unit through the connecting end, and the connecting end is electrically connected to the second electrode.

5. The speed control circuit for a motor in a food processing machine according to claim 4, characterized in that, The connection end includes a connection plate and pins extending downward from the connection plate. The circuit board is provided with slots for the pins to be inserted, and the bottom surface of the connection plate is clearance-fitted with the upper surface of the circuit board.

6. The speed control circuit for a motor in a food processing machine according to claim 4, characterized in that, The circuit board also includes a wiring area connected to the connection terminal. The wiring area has a socket for inserting a wire connected to the negative terminal of a power supply. The wiring area protrudes outward relative to the connection terminal and is offset relative to the second copper foil area; or... The first and second springs have hollow areas on both sides of the connecting end, and the pins of the connecting end are formed by bending the spring body that closes the hollow areas downwards.

7. The speed control circuit for a motor in a food processing machine according to claim 1, characterized in that, The first spring and the second spring are independently fixed on the circuit board, and one end of the first spring and one end of the second spring are respectively electrically connected to the second electrode.

8. The speed control circuit for a motor in a food processing machine according to claim 1, characterized in that, The speed control circuit also includes a fixing bracket for fixing the circuit board. The fixing bracket has multiple vertically arranged insertion slots, and the circuit board can be selectively inserted into one of the insertion slots for fixing.

9. The speed control circuit for a motor in a food processing machine according to claim 8, characterized in that, The diode is located upstream of the first and second contact springs, along the insertion direction of the insertion slot into the circuit board.

10. The speed control circuit for a motor in a food processing machine according to claim 1, characterized in that, The diode, along with both the first and second copper foil regions, is located on the upper surface of the circuit board; or, The lower surfaces of the first and second springs are respectively provided with a first upper contact and a second upper contact. The first upper contact and the second upper contact are respectively used to conduct electricity when they abut against the first copper foil area and the second copper foil area. The vertical projection of the first upper contact falls completely within the first copper foil area, and the vertical projection of the second upper contact falls completely within the second copper foil area; or, The first spring contact has a first upper contact, and the second spring contact has a second upper contact. The planar area S1 of the first upper contact and the planar area S1 of the first copper foil area are respectively... * Satisfy: 3S1 < S1 * The planar area S2 of the second upper contact and the planar area S2 of the second copper foil area * Satisfy: 3S² < S² * ; or, The first spring has a first upper contact point, and the second spring has a second upper contact point. The distance L1 from the first upper contact point to the first copper foil area satisfies: 3mm≤L1≤8mm, and the distance L2 from the first upper contact point to the first copper foil area satisfies: 3mm≤L2≤8mm.

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