Hydraulic positioning mechanism

Abstract

The invention discloses a hydraulic positioning mechanism which comprises a double-head oil cylinder and a piston thereof, and a guide column and a valve which are fixed on the piston and can slide axially relative to the oil cylinder. The closed cavity of the oil cylinder forms a hydraulic oil loop on which the valve is arranged, and when the valve is closed, the hydraulic oil loop is disconnected. When the hydraulic positioning mechanism is used, the valve is opened to enable the hydraulic oil loop in the closed cavity to be connected, external force is exerted to enable the guide column topush the piston and the oil cylinder to axially slide relatively, the distribution of the hydraulic oil in the closed cavity is changed and the hydraulic oil in the closed cavity flows from one side pressed by the piston to the other side of the closed cavity through the hydraulic oil loop. When the valve is closed, the hydraulic oil in the closed cavity stays at fixed position and due to the incompressibility of the hydraulic oil, the positions of the oil cylinder and the piston are relatively fixed, thereby reaching the purpose of positioning the guide column. The hydraulic positioning mechanism has no phenomena of energy consumption and heat radiation, is gentle in movement without causing extra noise and is safe and reliable, and convenient to use.

Description

technical field [0001] The invention relates to a positioning mechanism, in particular to a hydraulic positioning mechanism for a treatment bed. Background technique [0002] Large-scale treatment or detection equipment, such as X-ray machines, CT machines, automatic thermotherapy machines, molding machines, etc., are generally equipped with a manually adjustable movement and positioning mechanism while using a motor system for automatic motion control. In order to increase the effective range that can be treated, reduce unnecessary large-scale movement, reduce the frequency of mechanical actions that are not related to treatment or detection, and improve treatment efficiency. The positioning of the manual adjustment mechanism is mechanical, such as the FEP-BY series hyperthermia machine of Beijing Yuande Biomedical Engineering Co., Ltd.; some use electromagnet attraction, such as the F30- IIF 200mA X-ray machine. There are deficiencies in these positioning methods, among ...

AI Technical Summary

Problems solved by technology

There are deficiencies in these positioning methods, among which mechanical positioning such as figure 1 As shown, it is necessary to manually tighten or loosen the screws used to fix the connecting plate and the bed surface, and control the friction force of the clamp by adjusting the screws, so as to realize the fixation and movement of the bed surface relative to the bed, etc., which are very clinically used. inconvenient

The way the electromagnet pulls in is as figure 2 As shown, knocking noise and electromagnetic pulse interference will be generated when the magnet is engaged. If the magnet is in the state of energized and engaged for a long time, there will be a safety hazard of coil heating.

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