Cutter shaft connecting structure

Abstract

A cutter shaft connecting structure comprises a cutter holder and a cutter shaft, and a connector is arranged in the center of the upper end face of the cutter shaft. At least two spiral grooves are formed in the outer wall of the connector; a connecting hole matched with the connector is formed in the tool apron; spiral teeth matched with the at least two spiral grooves are arranged on the inner wall of the connecting hole; the connecting hole is formed in the center of the upper end face of the tool apron. An insertion hole coaxial with the connecting hole is formed in the center of the lower end face of the tool apron. The inserting hole is communicated with the connecting hole, and the diameter of the inserting hole is larger than that of the connecting hole; the upper end of the cutter shaft upwards penetrates into the inserting hole, and the connector is in spiral connection with the spiral teeth on the inner wall of the connecting hole through at least two spiral grooves. According to the utility model, the cutter holder can be stably connected to the cutter shaft when the stirring blade cuts food, and the cutter holder and the cutter shaft can be prevented from being thoroughly seized, so that the cutter holder can be quickly disassembled.

Description

Technical Field

[0001] This utility model relates to the field of food processing devices, and in particular to a cutter shaft connection structure. Background Technology

[0002] In daily life, food processing devices such as blenders, food processors, and high-speed blenders all have mixing blades for cutting and mixing food. The mixing blades consist of a blade holder and several blades arranged in a circle on the outer wall of the blade holder. The motor used to drive the mixing blades is generally installed in the base of the food processing device. The upper end of the motor shaft is connected to the blade shaft through a coupling. The upper end of the blade shaft passes upward into the lower part of the food processing device. At this time, the mixing blades can be fixed to the upper end of the blade shaft through the blade holder.

[0003] Traditionally, the blade holder and blade shaft of a mixing blade are fixed together by a threaded connection. However, in actual use of food processing equipment, as the motor drives the mixing blade to rotate, it generates a strong centrifugal force. This centrifugal force can cause the internal thread on the inner wall of the blade holder to seize with the external thread on the upper end of the blade shaft. At this point, it takes a great deal of force to unscrew the blade holder from the upper end of the blade shaft. Since the blade shaft is connected to the motor shaft, if too much force is applied to the blade holder, the blade shaft will rotate under the action of the motor shaft, making it even more difficult to unscrew the blade holder from the upper end of the blade shaft. If the mixing blade cannot be removed from the food processing equipment, it is extremely difficult to clean it after the food has been processed.

[0004] If the blade holder of the mixing blade is locked to the blade shaft under centrifugal force, the reaction force generated when the mixing blade cuts food cannot be effectively buffered. At this time, the mixing blade needs to fully bear the resistance from the food. Under the continuous resistance of high pressure, the mixing blade is very prone to tilting. In this case, the motor shaft is simultaneously compressed, which not only generates noise but also damages the motor and affects its service life. Summary of the Invention

[0005] The present invention aims to solve the existing technical problem by providing a blade shaft connection structure that not only ensures that the blade holder can be stably connected to the blade shaft when the stirring blade is cutting food, but also prevents the blade holder from completely seizing up with the blade shaft, thus enabling quick disassembly of the blade holder.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0007] This utility model discloses a tool shaft connection structure, including a tool holder and a tool shaft. A connector is provided at the center of the upper end face of the tool shaft. The outer wall of the connector is provided with at least two spiral grooves. The tool holder is provided with a connecting hole that matches the connector. The inner wall of the connecting hole is provided with spiral teeth that match the at least two spiral grooves. The connecting hole is located at the center of the upper end face of the tool holder. An insertion hole coaxial with the connecting hole is provided at the center of the lower end face of the tool holder. The insertion hole communicates with the connecting hole, and the diameter of the insertion hole is larger than the diameter of the connecting hole. The upper end of the tool shaft is inserted upward into the insertion hole, and the connector is spirally connected to the spiral teeth on the inner wall of the connecting hole through the at least two spiral grooves.

[0008] The lower end of the insertion hole has an inner wall with a guide cone surface that is narrower at the top and wider at the bottom.

[0009] The lower end of the insertion hole has an annular guide step on its inner wall.

[0010] The depth of the insertion hole is greater than twice the depth of the connecting hole.

[0011] The number of spiral grooves and spiral teeth is three each.

[0012] The number of spiral grooves and spiral teeth is 4 each.

[0013] The number of spiral grooves and spiral teeth is 5 each.

[0014] The number of spiral grooves and spiral teeth is 6 each.

[0015] The beneficial effects of this utility model are:

[0016] Compared with the prior art, the cutter shaft connection structure of this utility model has a multi-start thread structure. Because the connector at the upper end of the cutter shaft is helically connected to the helical teeth on the inner wall of the connecting hole on the cutter holder through at least two helical grooves, it can form a structure that connects two independent components through a multi-start thread. Under the same pitch, the lead of the multi-start thread is larger. Ordinary threads can only move one pitch in one rotation, while multi-start threads can move a number of pitches corresponding to the number of threads in one rotation. This enables quick connection and disassembly between the cutter shaft and the cutter holder. At the same time, as the number of helical grooves and helical teeth increases, the self-locking property of the connection decreases. The helical direction of the helical grooves and helical teeth corresponds to the rotation direction of the cutter shaft driven by the motor shaft of the food processing device. Under the action of centrifugal force, the helical teeth and helical grooves are always tightly fitted. When the centrifugal force is lost, the connector can be disengaged from the connecting hole with very little external force, realizing the quick separation between the cutter holder and the cutter shaft. This facilitates the quick disassembly of the stirring blade and the subsequent internal cleaning of the food processing device.

[0017] Compared with the prior art, the blade shaft connection structure of this utility model allows the pressure exerted on the mixing blade by the food during food cutting to cause the blade holder to rotate briefly. This briefly loosens the connection between the spiral groove and the spiral teeth, effectively releasing the pressure. Then, under centrifugal force, the spiral groove and spiral teeth re-engage tightly, ensuring the stability of the blade shaft when connected to the blade holder via the connector. This effectively guarantees the stability of the mixing blade during food cutting. Because the pressure exerted on the mixing blade by the food is effectively buffered, it effectively prevents the blade holder and blade shaft from seizing together, which could cause excessive pressure on the mixing blade, resulting in noise or damage to the motor. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the cutter shaft connection structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the cutter shaft connection structure of this utility model. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0021] Please see Figure 1 , Figure 2 This utility model provides a cutter shaft connection structure, including a cutter holder 1 and a cutter shaft 2. A connector 201 is provided at the center of the upper end face of the cutter shaft 2. The outer wall of the connector 201 is provided with at least two spiral grooves 202. The cutter holder 1 is provided with a connecting hole 101 that matches the connector. The inner wall of the connecting hole 101 is provided with spiral teeth 102 that match the at least two spiral grooves 202.

[0022] The connecting hole 101 is located at the center of the upper end face of the tool holder 1; the lower end face of the tool holder 1 is provided with an insertion hole 103 coaxial with the connecting hole 101; the insertion hole 103 communicates with the connecting hole 101, and the diameter of the insertion hole 103 is larger than the diameter of the connecting hole 101; the upper end of the tool shaft 2 is inserted upward into the insertion hole 103, and the connector 201 is helically connected to the helical teeth of the inner wall of the connecting hole 101 through at least two helical grooves 202.

[0023] The lower end of the insertion hole 103 has an inner wall with a guide cone surface 104 that is narrower at the top and wider at the bottom.

[0024] The lower end of the insertion hole 103 has an annular guide step on its inner wall.

[0025] The depth of the insertion hole 103 is greater than twice the depth of the connection hole 101.

[0026] The spiral groove 202 and the spiral tooth 102 each have 3 spiral grooves.

[0027] The spiral groove 202 and the spiral tooth 102 each have 4 spiral grooves.

[0028] The spiral groove 202 and the spiral tooth 102 each have 5 spiral grooves.

[0029] The spiral groove 202 and the spiral tooth 102 each have 6 spiral grooves.

[0030] The method of using this utility model is as follows:

[0031] Since the connector 201 at the upper end of the cutter shaft 2 is helically connected to the helical teeth 102 on the inner wall of the connecting hole 101 on the tool holder 1 through at least two helical grooves 202, a structure can be formed that connects two independent components through a multi-start thread. At the same pitch, the lead of the multi-start thread is larger. A regular thread can only move one pitch per revolution, while a multi-start thread can move a number of pitches corresponding to the number of threads per revolution. This allows for quick connection and disassembly between the cutter shaft 2 and the tool holder 1. Simultaneously, as the helical grooves 202 and helical teeth 102... As the number increases, the self-locking property of the connection between the two decreases. The spiral direction of the spiral groove 202 and the spiral tooth 102 corresponds to the rotation direction of the blade shaft 2 driven by the motor shaft of the food processing device. Under the action of centrifugal force, the spiral tooth 102 and the spiral groove 202 are always tightly fitted. When the centrifugal force is lost, the connector 201 can be disengaged from the connection hole 101 with very little external force, realizing the rapid separation between the blade holder 1 and the blade shaft 2, thereby realizing the rapid disassembly of the stirring blade, which is beneficial for the internal cleaning of the food processing device in the later stage.

[0032] When the mixing blade cuts food, the pressure exerted by the food on the mixing blade causes the blade holder to rotate briefly. The spiral groove 202 and the spiral tooth 102 briefly enter a loosely screwed state, effectively releasing the pressure exerted by the food on the mixing blade. Then, under the action of centrifugal force, the spiral groove 202 and the spiral tooth 102 will re-engage tightly, thus ensuring the stability of the blade shaft 2 when connected to the blade holder 1 through the connector 201. This effectively ensures the stability of the mixing blade when cutting food. Since the pressure exerted by the food on the mixing blade can be effectively buffered, it can effectively prevent the blade holder 1 and the blade shaft 2 from seizing together, which would cause the mixing blade to bear excessive pressure, resulting in noise or damage to the motor.

[0033] The inner wall of the lower end of the insertion hole 103 is provided with a guide cone 104 that is narrower at the top and wider at the bottom. The presence of the guide cone 104 can guide the upper end of the cutter shaft 2 to be inserted into the insertion hole 103 through the lower end of the insertion hole 103, so that the connector 201 can quickly enter into the connection hole 101, thereby realizing the quick connection between the cutter holder 1 and the cutter shaft 2.

[0034] The inner wall of the lower end of the insertion hole 103 is provided with an annular guide step. The presence of the guide step can effectively expand the actual diameter of the lower end of the insertion hole 103, making it easier for the upper end of the tool shaft 2 to quickly pass upward into the insertion hole 103. This structural design can also realize the quick connection between the tool holder 1 and the tool shaft 2.

[0035] The depth of the insertion hole 103 is greater than twice the depth of the connection hole 101. This structural design ensures that the length of the part of the cutter shaft 2 located in the insertion hole 103 is at least twice that of the connector 201, thereby effectively ensuring that the cutter shaft 2 can withstand most of the pressure from the tool holder 1, and avoiding the situation where the pressure on the tool holder 1 is entirely borne by the connector 201, which may easily lead to deformation or breakage of the connector 201.

[0036] When there are 3 spiral grooves 202 and 3 spiral teeth 102, one rotation can move 3 times the pitch, effectively reducing some of the self-locking. Only a small force needs to be applied to the tool holder 1, and a small angle needs to be rotated to easily remove the tool holder 1 from the tool shaft 2. Similarly, when there are 4 or 5 spiral grooves 202 and 5 spiral teeth 102, one rotation can move 4 or 5 times the pitch. The more spiral grooves 202 and 102 there are, the worse the self-locking is, and the less force is required to rotate the tool holder 1. Therefore, the number of spiral grooves 202 and 102 can be set according to actual needs.

[0037] When there are 6 spiral grooves 202 and 6 spiral teeth 102, one rotation can move 6 times the pitch, further reducing the self-locking property. At this time, less force is needed to rotate the tool holder 1, and a smaller angle can be used to remove the tool holder 1 from the tool shaft 2, resulting in the best disassembly and assembly effect. Meanwhile, the user can also set the number of spiral grooves 202 and 6 spiral teeth 102 to more than 6 according to the specific usage requirements.

Claims

1. A tool shaft connection structure comprising a tool holder, a tool shaft, characterized in that: A connector is provided at the center of the upper end face of the cutter shaft; the outer wall of the connector is provided with at least two spiral grooves; the cutter holder is provided with a connecting hole that matches the connector; the inner wall of the connecting hole is provided with spiral teeth that match the at least two spiral grooves. The connecting hole is located at the center of the upper end face of the tool holder; the center of the lower end face of the tool holder is provided with an insertion hole coaxial with the connecting hole; the insertion hole and the connecting hole are connected, and the diameter of the insertion hole is larger than the diameter of the connecting hole; the upper end of the tool shaft is inserted upward into the insertion hole, and the connector is helically connected to the helical teeth on the inner wall of the connecting hole through at least two helical grooves.

2. The knife shaft connection structure according to claim 1, characterized by: The lower end of the insertion hole has an inner wall with a guide cone surface that is narrower at the top and wider at the bottom.

3. The knife shaft coupling structure of claim 1, wherein: The lower end of the insertion hole has an annular guide step on its inner wall.

4. The knife shaft coupling structure of claim 1, wherein: The depth of the insertion hole is greater than twice the depth of the connecting hole.

5. The knife shaft coupling structure of claim 1, wherein: The number of spiral grooves and spiral teeth is three each.

6. The knife shaft coupling structure of claim 1, wherein: The number of spiral grooves and spiral teeth is 4 each.

7. The knife shaft coupling structure of claim 1, wherein: The number of spiral grooves and spiral teeth is 5 each.

8. The knife shaft coupling structure of claim 1, wherein: The number of spiral grooves and spiral teeth is 6 each.

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