Oral teaching imitation head model manual pitching mechanism

Abstract

The invention discloses an oral teaching imitation head model manual pitching mechanism, and the mechanism comprises a rotating shaft, a rotating shaft seat, a lever fulcrum shaft, a prized shaft, a clamping block, a wrench rod assembly, and a pre-pressing spring assembly. The wrench rod assembly comprises two wrench rods which are set at an interval, a wrench handle and a connecting rod, whereinthe wrench handle and the connecting rod are connected between the two wrench rods. Each wrench rod comprises a straight rod part and an S-shaped curved rod part which is formed at one end of the straight rod in an extending manner. The pre-pressing spring assembly comprises a pre-pressing spring and an adjustment fastening part. According to the invention, the wrench rod assembly and the prized shaft and the lever fulcrum shaft installed on the clamping block form a lever and eccentricity dual-labor-saving mechanism, and the pre-pressing spring assembly is used for providing a clamping forceso that the clamping block clamps the rotating shaft tightly, thereby forming the manual and labor-saving mechanism provided by the invention which is convenient to install, is firm in structure and is low in fault rate.

Description

technical field [0001] The invention relates to an imitation headform mechanism for oral cavity teaching, in particular to a manual pitching mechanism for an imitative headform for oral cavity teaching. Background technique [0002] The most basic equipment in dental teaching is the imitation head model. The function of the imitation head model is to simulate the pitching motion of the patient and the dental chair. The imitation head model system generally includes an imitation head model (including the head and shoulders), a treatment case, and a connecting device. three parts. The connecting device needs to undertake the function of moving the headform relative to the treatment cabinet, and the movement that the connecting device needs to complete is divided into two parts, the pitching motion back and forth and the lifting motion up and down. The mechanism that produces pitching motion is divided into electric, pneumatic, hydraulic and manual according to the type of dri...

AI Technical Summary

Problems solved by technology

Although the electric pitching mechanism is easy to realize automation, convenient control and labor-saving, but the manufacturing cost is relatively high, there are many parts and wires, it cannot withstand the reckless use of students, and the failure rate is relatively high

The place of use of the pneumatic pitching mechanism must be equipped with an air source, and the place of use is limited; there are multiple air pipes in the mechanism, and the failure rate is relatively high

The hydraulically driven pitching mechanism has not been used due to high cost, troublesome maintenance, and large volume.

[0003] There are usually two types of existing manual pitching mechanisms. One is the universal joint manual pitching mechanism. Although this mechanism looks very simple, there is a problem. The universal joint relies on the peripheral parts of the universal ball to compress the ball head. The friction force is used to play the role of locking and positioning. The locking force is transmitted by rotating the thread of the locking handle. The locking handle relies on the length of the force arm to amplify the rotational force of the hand. The angle of rotation must be at least 180° In order to balance the force, the universal joint is located in the middle of the bottom of the shoulder body of the artificial head model, but the connection space between the artificial head model and the treatment machine is limited, and the handle cannot be designed to be very long, which leads to relatively large and powerful hands students with small hands can't tighten it tightly

It is difficult to lock completely, and the universal ball head is rubbed back and forth during use, and the failure rate is relatively high

In addition, in terms of the design of the universal joint, the pressed contact area is limited, and the locking force is also limited. Students can often adjust the pitch position by using a hard pull to imitate the head model, resulting in damage to the universal joint mechanism.

In terms of manufacturing, the processing accuracy of the spherical contact is very high, resulting in a high defect rate

Another kind of manual pitching mechanism is the gear mechanism, including the screw mechanism and the ratchet mechanism. This mechanism has fatal flaws, because the gear gap is unavoidable, and the small gear gap, transmitted through a certain length of the dummy head mold, will cause the dummy head mold to lose weight. Visible head shaking during use, which is not allowed in teaching

Images