High-speed worm gear dental handpiece with emergency stop and brake functions

Abstract

The utility model relates to the technical field of high-speed dental treatment equipment, in particular to a high-speed worm gear dental handpiece with an emergency stop and brake function, which comprises a handpiece, a wind wheel, a mandrel and a bearing are arranged in the handpiece, a brake component is further arranged in the handpiece and comprises a brake pad and a brake pad sleeve, the brake pad is of a horn mouth-shaped structure made of elastic materials, and the brake pad sleeve is sleeved with the brake pad. The brake pad sleeve is of an annular structure made of hard materials and comprises a connecting ring, an embedding groove and a horn-mouth-shaped skirt edge, a plurality of notches are formed in the skirt edge, the brake pad sleeve is connected with the machine head shell, the brake pad is connected with the brake pad sleeve, and the front end of the mandrel penetrates through a middle hole of the brake pad. When the inside of the machine head is under positive pressure, the brake pad can be blown to expand outwards so as to be separated from the mandrel and attached to the skirt edge, and when the inside of the machine head is under negative pressure, the brake pad can contract inwards so as to be attached and rubbed with the mandrel; according to the dental handpiece provided by the utility model, the mandrel can be quickly braked after the compressed air is cut off, and the dental handpiece has an anti-back-suction function, adopts a modular structure, is convenient and firm to install, and is convenient for practical application.

Description

Technical Field

[0001] The utility model relates to the technical field of high-speed dental treatment equipment, in particular to a high-speed worm gear dental handpiece with an emergency stop brake function. Background Art

[0002] Existing high-speed turbine dental handpieces generally include a handpiece and a handle, wherein the handpiece has a built-in core shaft and wind wheel. The compressed air is used to blow the wind wheel to rotate to generate power, thereby driving the core shaft to rotate at high speed, and then the teeth are treated (such as grinding teeth) through the needle installed on the core shaft. At this time, compressed air enters the handpiece to blow the wind wheel to rotate, and the inside of the joint is a positive pressure environment; when the machine needs to be shut down, the compressed air supply will be cut off. At this time, the high-speed rotation of the wind wheel has inertia and will continue to rotate for a period of time, and it cannot be shut down quickly, affecting operation. The continued rotation of the wind wheel will cause a negative pressure environment to form inside the handpiece, resulting in a back suction phenomenon. The patient's oral fluid may be sucked into the handpiece through the gap between the front end of the handpiece and the core shaft, posing a risk of cross infection. In response to the above problems, the utility model patent with application number 202122177682.1 discloses a dental handpiece anti-backsuction structure, which forms a turbulent structure by fixing an anti-backsuction cover on the core shaft and using the first annular groove respectively arranged on the bearing seat and the second annular groove on the anti-backsuction cover. When the airflow is sucked back through the turbulent structure, turbulence will occur, preventing the airflow or liquid flow from passing through, thereby realizing the anti-backsuction function. However, the patented technical solution cannot realize the braking function. After the compressed air supply is cut off, the high-speed rotating wind wheel will continue to rotate for a period of time under the action of inertia and cannot be stopped quickly. Although some existing technologies use rubber sheets as anti-backsuction structures, which can also produce braking effects, the rubber sheets are inconvenient to install and fix, and the rubber sheets are easy to loosen and fall off after a period of use, resulting in unstable operation and easy failure. Therefore, they cannot be actually produced and applied. Utility Model Content

[0003] In order to overcome the deficiencies of the above-mentioned prior art, the task of the utility model is to provide a high-speed worm gear dental handpiece with an emergency stop brake function, which can quickly brake the core shaft after the compressed air is cut off, and has an anti-backsuction function. It also adopts a modular structure, is easy and secure to install, is not easy to loosen and fall off, and is convenient for actual production application.

[0004] The utility model task is achieved through the following technical solutions:

[0005] A high-speed worm gear dental handpiece with an emergency stop brake function comprises a handpiece, the handpiece comprises a handpiece shell and a wind wheel, a core shaft and two bearings arranged therein, the core shaft and the handpiece shell are rotatably connected through two bearings, the wind wheel sleeve is arranged on the core shaft and is located between the two bearings, and a brake assembly is also provided in the handpiece, the brake assembly comprises a brake pad and a brake pad sleeve, the brake pad is a trumpet-shaped structure made of elastic material, the brake pad sleeve is an annular structure made of hard material, comprises a connecting ring located on the outside, an embedding groove arranged on the inner side of the connecting ring, and a trumpet-shaped skirt arranged on the inner side of the embedding groove, a plurality of notches are arranged at circumferential intervals on the upper edge of the skirt, wherein the brake pad sleeve is detachably fixedly connected to the handpiece shell through the connecting ring, an embedding ring is arranged on the outer side of the brake pad and is embedded in the embedding groove of the brake pad sleeve, the front end of the core shaft passes through the middle hole of the brake pad, and when the internal pressure of the handpiece is positive, the brake pad can be blown outward to open and disengage from the core shaft and fit into the skirt, and when the internal pressure of the handpiece is negative, the brake pad can be contracted inward to fit and rub against the core shaft.

[0006] As an optimal technical solution, a water spray seat is also provided in the machine head, which is fixed at the front end of the machine head, the core shaft passes through the water spray seat with a gap between the two, and the brake assembly is located between the water spray seat and the bearing on the front side.

[0007] As a preferred technical solution, the front part of the machine head shell is provided with an inwardly extending annular support wall, and an annular slot is formed between the front end of the bearing on the front side and the support wall. An annular wave spring is also provided in the annular slot. The connecting ring is an annular plug-in sheet structure. The brake pad sleeve is inserted into the annular slot through its connecting ring and is elastically pressed against the machine head shell or the bearing through the wave spring.

[0008] As a preferred technical solution, the cross-section of the embedding ring is a triangle or a quasi-triangle structure, and the embedding groove is a narrow-mouthed, big-bellied ring groove that matches the embedding ring.

[0009] Compared with the prior art, the utility model provides a high-speed worm gear dental handpiece with an emergency stop brake function, which has the following advantages: 1. A modular brake assembly is provided, which is composed of an elastic brake pad and a hard brake pad cover. The brake assembly can be pre-assembled. When it needs to be installed in the handpiece, it only needs to be placed in the handpiece and then the brake pad cover is pressed and fixed. The installation is convenient and reliable, and it is not easy to loosen after long-term use, which is convenient for actual production application; 2. By providing a trumpet-shaped skirt on the inner side of the brake pad cover and providing a plurality of notches on the skirt, when the dental handpiece is working normally, the positive pressure environment inside the handpiece will blow the brake pad outward The notches on the skirt of the brake pad cover increase the airflow, allowing the airflow outside the handpiece to pass through the notches and press against the front side of the brake pad, causing the brake pad to shrink inward and fit tightly against the outer surface of the core shaft, thereby sealing the gap between the brake pad and the core shaft, achieving the return suction function, and utilizing the friction between the two to achieve the emergency stop braking function of the core shaft.

[0010] The concept, specific structure and effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, features and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the external structure of a high-speed worm gear dental handpiece with an emergency stop brake function in an embodiment;

[0012] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of the middle machine head;

[0013] Figure 3 is a schematic diagram of the cross-sectional structure of a brake assembly;

[0014] Figure 4 It is a schematic diagram of the exploded structure of the brake assembly.

[0015] Among them: machine head 1, handle 2, machine head shell 11, support wall 111, wind wheel 12, spindle 13, front bearing 141, rear bearing 142, sealing ring 15, machine head rear cover 16, water spray seat 17, brake assembly 18, brake pad 181, snap ring 1811, brake pad sleeve 182, connecting ring 1821, embedded groove 1822, skirt 1823, notch 1824, wave spring 19, needle 3. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0017] It should be noted that when an element is referred to as being “connected” to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. Similar expressions are only for illustrative purposes and are not used to limit the present invention.

[0018] like Figure 1-4 As shown, the present embodiment provides a high-speed worm gear dental handpiece with an emergency stop brake function, comprising a handpiece 1 and a handle 2. The handpiece 1 comprises a handpiece shell 11 and a wind wheel 12, a spindle 13 and two bearings arranged therein, namely a front bearing 141 and a rear bearing 142. The spindle 13 is rotatably connected to the handpiece shell 11 through two bearings. The wind wheel 12 is sleeved on the spindle 13 and is located between the two bearings. A needle 3 is fixedly installed at the front end of the spindle 13. A sealing ring 15 is provided between the outer side of the bearing and the handpiece shell 11. A detachable handpiece rear cover 16 is provided on the rear side of the handpiece shell 11, and a detachable water spray seat 17 is provided at the front end. A brake assembly 18 is also provided in the handpiece 1 and is installed between the water spray seat 17 and the front bearing 141. The brake assembly 18 comprises a brake pad 181 and a brake pad sleeve 182. The brake pad 181 is made of elastic material. The brake pad cover 182 is an integrated annular structure made of a hard material, including a connecting ring 1821 located on the outside, an embedding groove 1822 arranged on the inner side of the connecting ring 1821, and a trumpet-shaped skirt 1823 arranged on the inner side of the embedding groove 1822. A plurality of notches 1824 are arranged at intervals along the circumferential direction on the skirt 1823. The brake pad cover 182 is detachably fixedly connected to the machine head shell 11 through the connecting ring 1821. An embedding ring 1811 is provided on the outer side of the brake pad 181 and is embedded in the embedding groove 1822 of the brake pad cover 182. The front end of the core shaft 13 passes through the hole in the brake pad 181. When the internal pressure of the machine head 1 is positive, the brake pad 181 can be blown outward to open and disengage from the core shaft 13 and fit with the skirt 1823. When the internal pressure of the machine head 1 is negative, the brake pad 181 can be contracted inward to fit and rub against the core shaft 13.

[0019] The high-speed worm gear dental handpiece with emergency stop brake function provided in this embodiment has the following working principle: when the dental handpiece is working normally, the positive pressure environment inside the handpiece 1 will blow the brake pad 181 outward to fit on the skirt 1823 of the brake pad cover 182, and the part where the brake pad 181 contacts the notch 1824 will be slightly elastically deformed and embedded in the notch 1824, thereby preventing the rotating airflow generated by the high-speed rotation of the wind wheel 12 from causing the brake pad 181 to rotate or even loosen; when the dental handpiece is stopped and the air is cut off, a negative pressure environment is formed inside the handpiece 1, and the several notches 1824 on the skirt 1823 of the brake pad cover 182 can increase the airflow, so that the airflow outside the handpiece 1 is pressed on the front side of the brake pad 181 through the notches 1824, causing the brake pad 181 to shrink inward and fit tightly on the outer surface of the core shaft 13, thereby blocking and sealing the gap between the brake pad 181 and the core shaft 13, realizing the return suction function, and utilizing the friction between the two to realize the emergency stop brake function of the core shaft 13. The brake assembly 18 adopts a modular structure, which is composed of an elastic brake pad 181 and a hard brake pad cover 182. The brake assembly 18 can be pre-assembled. When it needs to be installed in the machine head 1, it only needs to place the entire brake assembly 18 into the machine head 1 and then press and fix the brake pad cover 182. It is easy and reliable to install, and it is not easy to loosen after long-term use, which is convenient for actual production application.

[0020] As a preferred solution of this embodiment, the front part of the machine head housing 11 is provided with an annular support wall 111 extending inward, and an annular slot is formed between the front end of the front bearing 141 and the support wall 111, and an annular wave spring 19 is also provided in the annular slot, and the connecting ring 1821 is an annular plug-in sheet structure, and the brake pad sleeve 182 is inserted into the annular slot through its connecting ring 1821 and elastically pressed against the machine head housing 11 or the bearing through the wave spring 19. The advantages of this design are simple structure, convenient manufacturing and installation, and the use of the wave spring 19 to achieve elastic compression of the brake pad sleeve 182, which can prevent the brake pad sleeve 182 from loosening, facilitate installation, and reduce the requirements for product processing technology and dimensional accuracy.

[0021] As a preferred solution of this embodiment, the cross section of the snap ring 1811 is a triangle or a quasi-triangle structure, and the embedding groove 1822 is a narrow-mouthed, big-belly-shaped ring groove matching the snap ring 1811. The advantages of this design are simple structure, easy manufacturing and installation, and can effectively prevent the brake pad 181 from falling off.

[0022] The preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

Claims

1. A high-speed worm gear dental handpiece with an emergency stop brake function, comprising a handpiece, the handpiece comprising a handpiece housing, a wind wheel, a core shaft and two bearings arranged therein, the core shaft and the handpiece housing are rotatably connected through two bearings, the wind wheel is sleeved on the core shaft and located between the two bearings, characterized in that: A brake assembly is also provided in the machine head, and the brake assembly includes a brake pad and a brake pad cover. The brake pad is a trumpet-shaped structure made of elastic material, and the brake pad cover is an annular structure made of hard material, including a connecting ring located on the outside, an embedding groove arranged on the inner side of the connecting ring, and a trumpet-shaped skirt arranged on the inner side of the embedding groove. A plurality of notches are provided at circumferential intervals on the upper edge of the skirt, wherein the brake pad cover is detachably fixedly connected to the machine head shell through the connecting ring, and an embedding ring is provided on the outer side of the brake pad and is embedded in the embedding groove of the brake pad cover. The front end of the core shaft passes through the hole in the brake pad. When the internal pressure of the machine head is positive, the brake pad can be blown outward to open and disengage from the core shaft and fit with the skirt. When the internal pressure of the machine head is negative, the brake pad can be contracted inward to fit and rub against the core shaft.

2. The high-speed worm gear dental handpiece with emergency stop brake function according to claim 1, characterized in that: A water spray seat is also provided in the machine head, which is fixed at the front end of the machine head. The core shaft passes through the water spray seat with a gap between the two. The brake assembly is located between the water spray seat and the bearing on the front side.

3. The high-speed worm gear dental handpiece with emergency stop brake function according to claim 1, characterized in that: An annular support wall extending inward is provided at the front of the machine head shell, and an annular slot is formed between the front end of the bearing on the front side and the support wall. An annular wave spring is also provided in the annular slot. The connecting ring is an annular plug-in plate structure. The brake pad sleeve is inserted into the annular slot through its connecting ring and is elastically pressed against the machine head shell or the bearing through the wave spring.

4. The high-speed worm gear dental handpiece with emergency stop brake function according to claim 1, characterized in that: The cross section of the snap ring is a triangle or a quasi-triangle structure, and the embedding groove is a narrow-mouthed, big-bellied ring groove matching the snap ring.

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