Magnetic force type force limiting device

Abstract

The utility model relates to a dental medical instrument, in particular to a magnetic force type force limiting device. The magnetic force type force limiting device comprises a handle with a spanner-shaped base body, a handle round hole used for being connected with a magnetic force rotor and a threaded hole connected with a magnetic force control ring are formed in the front end of the handle, three first magnetic force stators are evenly distributed on the inner side face of the handle round hole, and the magnetic force rotor comprises a convex-triangle-shaped rotating part and a short shaft part. Three magnetic stators II are uniformly distributed outside the convex triangular rotating part, a square hole for placing an ultrasonic working tip is formed in the end face of the short shaft part, and the magnetic control ring is in threaded connection with the interior of the threaded hole. The magnetic force type force limiting device can achieve the function of limiting torsional force, stepless adjustment of the force limiting value is achieved through introduction of the permanent magnet and the magnetic force control ring, and the magnetic force type force limiting device is simple in structure, low in cost and convenient to operate.

Description

Technical Field

[0001] This utility model relates to a force limiting device, and more particularly to a magnetic force limiting device. Background Technology

[0002] When installing the working tip of a dental ultrasonic irrigator, the use of a traditional wrench often results in excessive force applied by the operator, which can damage the threads of the amplitude transformer or cause the ultrasonic transducer to rotate inside the plastic housing, leading to equipment failure.

[0003] Against this backdrop, there is a need to invent a wrench with a limitable force value to protect the threads of the amplitude transformer and the ultrasonic transducer from damage when tightening the working tip. Utility Model Content

[0004] The present invention aims to solve the above-mentioned defects and provide a magnetic force limiting device.

[0005] To overcome the defects in the background technology, the technical solution adopted by this utility model to solve its technical problem is as follows: This magnetic force limiting device includes a handle with a wrench-shaped appearance. The front end of the handle is provided with a handle circular hole for connecting the magnetic rotor and a threaded hole for connecting the magnetic control ring. Three magnetic stators are evenly distributed on the inner side of the handle circular hole. The magnetic rotor includes a rotating part and a short shaft part with a convex triangular shape. Three magnetic stators are evenly distributed on the outside of the convex triangular rotating part. A square hole for placing the ultrasonic working tip is provided on the end face of the short shaft part. The magnetic control ring is threaded into the threaded hole.

[0006] According to another embodiment of the present invention, the magnetic stator is further comprising a neodymium iron boron permanent magnet with a magnetic N pole.

[0007] According to another embodiment of the present invention, the magnetic stator is further included as a neodymium iron boron permanent magnet with a magnetic S pole.

[0008] According to another embodiment of the present invention, the short shaft portion of the magnetic rotor is provided with a groove, in which a shaft retaining ring for axial positioning of the magnetic rotor is placed.

[0009] According to another embodiment of the present invention, an O-ring is provided at the root of the short shaft of the magnetic rotor, and the O-ring is made of rubber.

[0010] According to another embodiment of the present invention, the magnetic control ring is further made of a non-magnetic material.

[0011] According to another embodiment of the present invention, a blind hole is further provided on the outer side of the magnetic control ring for installing an adjusting pin.

[0012] The beneficial effects of this utility model are: this magnetic force limiting device can realize the function of limiting torsional force, and the limit force value is infinitely adjustable by introducing permanent magnets and magnetic control rings. It has a simple structure, low cost and convenient operation. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 yes Figure 1 Schematic diagram of the structure in the AA direction;

[0016] Figure 3 This is a schematic diagram of the handle's structure;

[0017] Figure 4 This is a schematic diagram of the magnetic rotor structure;

[0018] The components are: 1. Adjusting pin, 2. O-ring, 3. Shaft retaining ring, 4. Handle, 5. Magnetic stator one, 6. Magnetic control ring, 7. Magnetic rotor, 8. Threaded hole, 9. Groove, 10. Handle round hole, 11. Square hole, 12. Magnetic stator two. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art without creative effort in accordance with the embodiments of the basic utility model are within the protection scope of this utility model.

[0020] like Figure 1-4 As shown in the figure, the base has a handle 4 shaped like a wrench. The front end of the handle 4 has a handle hole 10 for connecting the magnetic rotor 7 and a threaded hole 8 for connecting the magnetic control ring 6. Three magnetic stators 5 are evenly distributed on the inner side of the handle hole 10. The magnetic rotor 7 includes a rotating part and a short shaft part in the shape of a convex triangle. Three magnetic stators 12 are evenly distributed on the outside of the rotating part in the shape of a convex triangle. A square hole 11 for placing the ultrasonic working tip is provided on the end face of the short shaft part. The magnetic control ring 6 is threaded into the threaded hole 8.

[0021] like Figure 4 As shown in the figure, the magnetic stator 212 is a neodymium iron boron permanent magnet with a magnetic N pole.

[0022] like Figure 3As shown in the figure, the magnetic stator-5 is a neodymium iron boron permanent magnet with a magnetic S pole.

[0023] like Figure 4 As shown in the figure, the short shaft of the magnetic rotor 7 is provided with a groove 9, and a shaft retaining ring 3 for axial positioning of the magnetic rotor 7 is placed in the groove 9.

[0024] like Figure 2 , 4 As shown in the figure, an O-ring 2 is provided at the root of the short shaft of the magnetic rotor 7. The O-ring 2 is made of rubber.

[0025] The magnetic control ring 6 is made of non-magnetic material. A blind hole is provided on the outer side of the magnetic control ring 6 for installing the adjusting pin 1.

[0026] The handle 4 serves as the base, resembling a wrench for easy gripping. A threaded hole 8 is located on the inner ring of the handle 4, engaging with the external thread of the magnetic control ring 6. The magnetic stator 5 consists of three S-pole neodymium iron boron permanent magnets evenly distributed within the inner hole 10 of the handle. The magnetic rotor 7 connects to the working tip of the dental ultrasonic cleaning device; it is convex triangular in shape, with three N-pole neodymium iron boron permanent magnets evenly distributed around it. A groove 9 is located on the short shaft of the magnetic rotor 7, housing a shaft retaining ring 3 for axial positioning. An O-ring is installed at the root of the short shaft of the magnetic rotor 7 to protect it from damage during rotation around the handle's circular hole 10. The magnetic control ring 6, made of non-magnetic material, is installed in the inner threaded hole of the handle, with a blind hole on its outer side for installing an adjusting pin 1. The operator can adjust the position of the magnetic control ring 6 by screwing the adjusting pin 1 into the thread.

[0027] Working principle:

[0028] The overall structure is designed for force protection during the installation of the ultrasonic root canal irrigation working tip. It utilizes the magnetic force between the magnetic rotor and the magnetic stator to convert it into rotational resistance, specifically manifested as a force limiting the rotation of the working tip. Simultaneously, the threaded engagement of the magnetic control ring adjusts the depth to which the ring is inserted into the magnetic field. The deeper the ring is inserted, the better the magnetic field shielding effect; in other words, the smaller the magnetic force between the magnetic rotor and the magnetic stator. The specific operating procedure is as follows:

[0029] 1. First, manually screw the ultrasonic working tip onto the thread of the ultrasonic rinsing device's amplitude transformer rod, without pre-tightening;

[0030] 2. Rotate the adjusting pin 1 on the magnetic control ring to adjust the limiting force value to a suitable state;

[0031] 3. Pass the ultrasonic working tip through the square hole 11 of the magnetic force limiting device, hold the handle 4 of the magnetic force limiting device, and rotate it clockwise at a constant speed until the convex triangle of the magnetic rotor 7 rotates to the next convex surface.

[0032] 4. Remove the ultrasonic cleaning device with the ultrasonic working tip installed from the force limiting device.

[0033] The overall structure can limit the torque when tightening the working tip of the washing machine. When the tightening force exceeds the wrench's limit, it will automatically release the force, which greatly protects the amplitude transformer and ultrasonic transducer of the washing equipment.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A magnetic force limiting device, comprising a handle (4) with a base resembling a wrench, characterized in that: The front end of the handle (4) is provided with a handle round hole (10) for connecting the magnetic rotor (7) and a threaded hole (8) for connecting the magnetic control ring (6). Three magnetic stators (5) are evenly distributed on the inner side of the handle round hole (10). The magnetic rotor (7) includes a rotating part and a short shaft part in the shape of a convex triangle. Three magnetic stators (12) are evenly distributed on the outside of the rotating part in the shape of a convex triangle. A square hole (11) for placing the ultrasonic working tip is provided on the end face of the short shaft part. The magnetic control ring (6) is threaded into the threaded hole (8).

2. The magnetic force limiting device as described in claim 1, characterized in that: The magnetic stator 2 (12) is a neodymium iron boron permanent magnet with a magnetic N pole.

3. The magnetic force limiting device as described in claim 1, characterized in that: The magnetic stator (5) is a neodymium iron boron permanent magnet with a magnetic S pole.

4. The magnetic force limiting device as described in claim 1, characterized in that: The short shaft of the magnetic rotor (7) is provided with a groove (9), in which a shaft retaining ring (3) for axial positioning of the magnetic rotor (7) is placed.

5. A magnetic force limiting device as described in claim 1, characterized in that: The root of the short shaft of the magnetic rotor (7) is provided with an O-ring (2), which is made of rubber.

6. A magnetic force limiting device as described in claim 1, characterized in that: The magnetic control ring (6) is made of non-magnetic material.

7. A magnetic force limiting device as described in claim 1, characterized in that: A blind hole is provided on the outer side of the magnetic control ring (6) for installing the adjusting pin (1).

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