Position limiting device for frequency adjusting knob of magnetron of linear accelerator

By designing the position limit device on the frequency of the magnetic control tube of the linear accelerator, the position of the position coding belt and the infrared light sensor are used to achieve the precise limit of the knob. The problem of tube damage.

CN222424084UActive Publication Date: 2025-01-28ZHIWEI PRECISION (BEIJING) MEDICAL TECH CO LTD +1
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202323542960.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-25
Publication Date
2025-01-28
Estimated Expiration
2033-12-25

AI Technical Summary

Technical Problem

It is difficult to accurately locate the frequency adjustment knob of the linear accelerator magnetron to the cold resonant position, and the rotation of the tuning motor to the limit position is likely to cause damage to the magnetron.

Method used

Design a position limit device including institutional parts, location coding bands, monocular beam reflective infrared sensors, controllers and tuning motors. With the position of the position coding belt and the infrared light sensor, the controller can detect the position of the knob and control the tuning motor to stop motion, so as to ensure that the knob reaches the cold resonance position.

Benefits of technology

The precise limit of the frequency adjustment knob is achieved, avoiding the magnetic control damage caused by the rotation of the tuning motor to the extreme position, and reducing the maintenance cost of the equipment.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222424084U_ABST
    Figure CN222424084U_ABST
Patent Text Reader

Abstract

The utility model discloses a position limiting device used for a linear accelerator magnetron frequency adjusting knob. The position limiting device comprises a mechanism member, a position coding belt, a single-beam reflection type infrared light sensor, a controller and a tuning motor. The mechanism part is sleeved on the frequency adjusting knob; the tuning motor is connected with the frequency adjusting knob and used for driving the frequency adjusting knob to rotate; the position coding belt is installed on the side face of the mechanism part when the frequency adjusting knob is located at the cold-state resonance position, meanwhile, the single-beam reflection-type infrared light sensor is installed at the vertical position away from the structural part by a preset distance, and the single-beam reflection-type infrared light sensor is in communication connection with the controller. When the single-beam reflection type infrared light sensor detects the position coding band, a level signal is output to the controller; the controller controls the tuning motor to stop moving according to the received level signal, and at the moment, the frequency adjusting knob is located at the cold-state resonance position. The position limiting device is simple in circuit, low in cost and easy to install.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the field of linear accelerators, in particular to a position limiting device for a frequency regulating knob of a magnetron of a linear accelerator. Background Art

[0002] The magnetron of a medical linear accelerator needs to control the frequency of the output power by rotating the frequency adjustment knob in real time to achieve matching with the resonant frequency of the accelerator tube.

[0003] In order to achieve cold start-up, the resonant motor needs to turn the frequency adjustment knob of the magnetron to the cold resonant position after the accelerator is turned on or the treatment is finished.

[0004] There are at least the following problems in the prior art:

[0005] When the tuning motor drives the magnetron to rotate, it is difficult to position the frequency adjustment knob of the magnetron to the cold resonance position. In addition, the price of the magnetron is very expensive. When the tuning motor rotates to the extreme position, it is easy to cause damage to the magnetron.

[0006] Currently, no effective solution has been proposed for the problems in the prior art. Utility Model Content

[0007] The utility model aims to provide a position limiting device for a frequency regulating knob of a linear accelerator magnetron in view of the deficiencies of the prior art.

[0008] The position limiting device for the linear accelerator magnetron frequency adjustment knob comprises a mechanism component, a position coding belt, a single-beam reflective infrared light sensor, a controller and a tuning motor;

[0009] The mechanism is mounted on the frequency adjustment knob and can rotate along with the rotation of the frequency adjustment knob;

[0010] The tuning motor is connected to the frequency adjustment knob and is used to drive the frequency adjustment knob to rotate;

[0011] The position coding belt is installed on the side of the mechanism when the frequency adjustment knob is in the cold resonant position, and the single-beam reflective infrared light sensor is installed at a vertical position at a preset distance from the mechanism, and the single-beam reflective infrared light sensor is communicatively connected with the controller;

[0012] When the single-beam reflective infrared light sensor detects the position coding belt, it outputs a level signal to the controller;

[0013] The controller is in communication connection with the tuning motor, and controls the tuning motor to stop moving according to the received level signal, at which time the frequency adjustment knob is in a cold resonant position.

[0014] Further, the position coding belt includes a first position coding belt, a second position coding belt and a third position coding belt; the single-beam reflective infrared light sensor includes a first single-beam reflective infrared light sensor, a second single-beam reflective infrared light sensor and a third single-beam reflective infrared light sensor;

[0015] The first position coding belt, the second position coding belt, and the third position coding belt are sequentially installed on the side of the mechanism component when the frequency adjustment knob is in the cold resonant position, and the angle between the first position coding belt, the second position coding belt, and the third position coding belt is 90°. The first single-beam reflective infrared light sensor, the second single-beam reflective infrared light sensor, and the third single-beam reflective infrared light sensor are respectively installed at a vertical position at a preset distance from the mechanism component corresponding to the first position coding belt, the second position coding belt, and the third position coding. When the controller simultaneously receives the level signals sent by the first single-beam reflective infrared light sensor, the second single-beam reflective infrared light sensor, and the third single-beam reflective infrared light sensor, it controls the tuning motor to stop moving.

[0016] Furthermore, the position coding belt is a belt-shaped structure.

[0017] Furthermore, the preset distance is 8mm-12mm.

[0018] Furthermore, the preset distance is 10 mm.

[0019] Furthermore, the mechanism component is a circular ring structure.

[0020] Furthermore, the position coding band is a black strip used for position coding.

[0021] Furthermore, the controller is a PLC controller.

[0022] Furthermore, the width of the mechanism component is 3mm-5mm.

[0023] Furthermore, the mechanism components are made of stainless steel.

[0024] Compared with the prior art, the position limiting device for the frequency adjustment knob of the linear accelerator magnetron described in the utility model has the following significant advantages:

[0025] 1. The position limiting device for the frequency adjustment knob of the linear accelerator magnetron described in the utility model has a simple circuit, low cost and easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the frequency adjustment knob of the position limiting device for the frequency adjustment knob of the linear accelerator magnetron of the utility model being in a cold resonant position;

[0027] Figure 2 It is a schematic diagram of the frequency adjustment knob of the position limiting device for the frequency adjustment knob of the linear accelerator magnetron of the utility model not being in the cold resonant position;

[0028] Figure 3 It is a schematic diagram of the frequency adjustment knob of the position limiting device for the frequency adjustment knob of the linear accelerator magnetron of the utility model not being in the cold resonant position;

[0029] Figure 4 This is a schematic diagram of a frequency adjustment knob of a position limiting device for a frequency adjustment knob of a linear accelerator magnetron according to the utility model not being in a cold resonant position. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0034] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0035] In addition, the terms "installed", "set", "provided with", "connected", "slidingly connected", "fixed", "clipped", and "set" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In addition, the term "plurality" shall mean two or more.

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] like Figures 1 to 4 As shown, the position limiting device for the frequency adjustment knob of the linear accelerator magnetron includes: a mechanism component, a position coding belt, a single-beam reflective infrared light sensor, a controller and a tuning motor;

[0039] The mechanism is mounted on the frequency adjustment knob and can rotate along with the rotation of the frequency adjustment knob;

[0040] The tuning motor is connected to the frequency adjustment knob and is used to drive the frequency adjustment knob to rotate;

[0041] The position coding belt is installed on the side of the mechanism when the frequency adjustment knob is in the cold resonant position, and the single-beam reflective infrared light sensor is installed at a vertical position at a preset distance from the mechanism, and the single-beam reflective infrared light sensor is communicatively connected with the controller;

[0042] When the single-beam reflective infrared light sensor detects the position coding belt, it outputs a level signal to the controller;

[0043] The controller is in communication connection with the tuning motor, and controls the tuning motor to stop moving according to the received level signal, at which time the frequency adjustment knob is in a cold resonant position.

[0044] Specifically, the controller controls the tuning motor to stop moving according to the received level signal, and can identify the travel limit of the frequency adjustment knob rotation stroke (one circle) to prevent the tuning motor from rotating to the extreme position and causing damage to the magnetron. The tuning motor is connected to the frequency adjustment knob, and the tuning motor can drive the frequency adjustment knob to rotate. The connection relationship here is conventional technology and will not be repeated here. The rotation stroke of the frequency adjustment knob is one circle, that is, 360°. The controller controls the tuning motor to stop moving according to the received level signal to prevent the tuning motor from driving the frequency adjustment knob to rotate beyond its rotation stroke, that is, to avoid exceeding one circle, thereby preventing the frequency adjustment knob from being damaged.

[0045] Further, the position coding belt includes a first position coding belt, a second position coding belt and a third position coding belt; the single-beam reflective infrared light sensor includes a first single-beam reflective infrared light sensor, a second single-beam reflective infrared light sensor and a third single-beam reflective infrared light sensor;

[0046] The first position coding belt, the second position coding belt, and the third position coding belt are sequentially installed on the side of the mechanism component when the frequency adjustment knob is in the cold resonant position, and the angle between the first position coding belt, the second position coding belt, and the third position coding belt is 90°. The first single-beam reflective infrared light sensor, the second single-beam reflective infrared light sensor, and the third single-beam reflective infrared light sensor are respectively installed at a vertical position at a preset distance from the mechanism component corresponding to the first position coding belt, the second position coding belt, and the third position coding. When the controller simultaneously receives the level signals sent by the first single-beam reflective infrared light sensor, the second single-beam reflective infrared light sensor, and the third single-beam reflective infrared light sensor, it controls the tuning motor to stop moving.

[0047] Specifically, the detection accuracy can be improved by using three position coding bands and the corresponding three single-beam reflective infrared light sensors. When the controller receives three level signals at the same time, it controls the tuning motor to stop moving. It should be noted that it is not limited to the three position coding bands and the corresponding three single-beam reflective infrared light sensors. The corresponding detection can be completed by increasing the number.

[0048] Furthermore, the position coding belt is a belt-shaped structure.

[0049] Specifically, the strip-shaped structure is easy to identify and is simple to process, thereby saving costs.

[0050] Furthermore, the preset distance is 8mm-12mm.

[0051] Furthermore, the preset distance is 10 mm.

[0052] Furthermore, the mechanism component is a circular ring structure.

[0053] Furthermore, the position coding band is a black strip used for position coding.

[0054] Furthermore, the controller is a PLC controller.

[0055] Furthermore, the width of the mechanism component is 3mm-5mm.

[0056] Furthermore, the mechanism components are made of stainless steel.

[0057] Specifically, stainless steel materials are corrosion-resistant and can increase the life of mechanical components.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A position limiting device for a frequency adjustment knob of a linear accelerator magnetron, characterized in that: include: Mechanism components, position coding tape, single beam reflective infrared light sensor, controller and tuning motor; The mechanism is mounted on the frequency adjustment knob and can rotate along with the rotation of the frequency adjustment knob; The tuning motor is connected to the frequency adjustment knob and is used to drive the frequency adjustment knob to rotate; The position coding belt is installed on the side of the mechanism when the frequency adjustment knob is in the cold resonant position, and the single-beam reflective infrared light sensor is installed at a vertical position at a preset distance from the mechanism, and the single-beam reflective infrared light sensor is communicatively connected with the controller; When the single-beam reflective infrared light sensor detects the position coding belt, it outputs a level signal to the controller; The controller is in communication connection with the tuning motor, and controls the tuning motor to stop moving according to the received level signal, at which time the frequency adjustment knob is in a cold resonant position.

2. The position limiting device for the frequency adjustment knob of a linear accelerator magnetron according to claim 1, characterized in that: The position coding belt includes a first position coding belt, a second position coding belt and a third position coding belt; the single-beam reflective infrared light sensor includes a first single-beam reflective infrared light sensor, a second single-beam reflective infrared light sensor and a third single-beam reflective infrared light sensor; The first position coding belt, the second position coding belt, and the third position coding belt are sequentially installed on the side of the mechanism component when the frequency adjustment knob is in the cold resonant position, and the angle between the first position coding belt, the second position coding belt, and the third position coding belt is 90°. The first single-beam reflective infrared light sensor, the second single-beam reflective infrared light sensor, and the third single-beam reflective infrared light sensor are respectively installed at a vertical position at a preset distance from the mechanism component corresponding to the first position coding belt, the second position coding belt, and the third position coding. When the controller simultaneously receives the level signals sent by the first single-beam reflective infrared light sensor, the second single-beam reflective infrared light sensor, and the third single-beam reflective infrared light sensor, it controls the tuning motor to stop moving.

3. The position limiting device for the frequency adjustment knob of a linear accelerator magnetron according to claim 2, characterized in that: The position coding belt is a belt-shaped structure.

4. The position limiting device for the frequency adjustment knob of a linear accelerator magnetron according to claim 3, characterized in that: The preset distance is 8mm-12mm.

5. The position limiting device for the frequency adjustment knob of a linear accelerator magnetron according to claim 4, characterized in that: The preset distance is 10 mm.

6. The position limiting device for the frequency adjustment knob of a linear accelerator magnetron according to claim 5, characterized in that: The mechanism component is a circular ring structure.

7. The position limiting device for the frequency adjustment knob of a linear accelerator magnetron according to claim 3, characterized in that: The position coding band is a black band and is used for position coding.

8. The position limiting device for the frequency adjustment knob of a linear accelerator magnetron according to claim 1, characterized in that: The controller is a PLC controller.

9. The position limiting device for the frequency adjustment knob of a linear accelerator magnetron according to claim 6, characterized in that: The width of the mechanism component is 3mm-5mm.

10. The position limiting device for the frequency adjustment knob of a linear accelerator magnetron according to claim 6, characterized in that: The mechanism components are made of stainless steel.