An automatic Z-axis calibration system for a treatment bed of a spiral tomography radiotherapy device

Abstract

The utility model is an automatic Z-axis calibration system for a treatment bed of a spiral tomography radiotherapy device, comprising a bed support and a treatment bed, a plurality of conveying rollers are installed on the top of the bed support, wherein pressure sensors are installed in two conveying rollers close to the treatment bed, a laser rangefinder is installed on one end of the top of the bed support close to the treatment bed, a bed panel is arranged on the top of the treatment bed, a lifting mechanism is connected to the bottom of the bed support and the bottom of the treatment bed, and a hard limit device is arranged on the lifting mechanism. The utility model improves the efficiency of the treatment bed calibration, and can complete the calibration of the Z-axis hard limit, soft limit and bed support linkage at one time, reducing the time of manual operation; the bed panel and bed support linkage debugging are automatically set through the pressure sensor, reducing the possibility of manual operation errors, and avoiding the risk of bending and deformation of the bed panel due to the bed panel descending too low; the fully automatic calibration procedure and the cooperation of each pressure sensor ensure the stability and consistency of the calibration.

Description

Technical Field

[0001] The utility model relates to the technical field of spiral tomographic radiotherapy equipment calibration, in particular to a spiral tomographic radiotherapy equipment treatment bed Z-axis automatic calibration system. Background Art

[0002] After the treatment bed of the spiral tomography equipment is aligned with the frame and landed, the initial calibration of the treatment bed is required, including setting the hard and soft limits of the X-axis, Y-axis, and Z-axis of the bed. The existing calibration software and operation steps are very cumbersome, and the operator needs to follow the software upgrade and manually click to confirm step by step to gradually complete the calibration work. Especially when calibrating the Z axis, the bed panel and the bed support need to be debugged in conjunction. When adjusting the lowering of the bed panel, the human eye needs to observe the distance and click the lowering button step by step to complete the lowering operation of the bed panel. When setting the lowering distance, if the distance is set too large, the bed panel will continue to descend after it has contacted the rollers of the bed support. There is a risk of the bed panel being bent and deformed. At the same time, people need to carefully observe the gap between the bed panel and the rollers of the bed support, and push and pull the bed panel to feel whether the bed support can be stably supported and run without jamming. People need to feel it to confirm whether it is adjusted in place, which has a great impact on the consistency and stability of the product settings. Utility Model Content

[0003] The utility model aims to solve the deficiencies of the prior art and provides a Z-axis automatic calibration system for a treatment bed of a spiral tomographic radiotherapy device.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] A Z-axis automatic calibration system for a treatment bed of a spiral tomography radiotherapy device comprises a bed support and a treatment bed. A plurality of conveying rollers are installed on the top of the bed support, wherein two conveying rollers close to the treatment bed are installed with pressure sensors, a laser rangefinder is installed on one end of the top of the bed support close to the treatment bed, a bed panel is arranged on the top of the treatment bed, and a lifting mechanism is connected to the bottom of the bed support and the bottom of the treatment bed, and a hard limit device is arranged on the lifting mechanism.

[0006] The lifting mechanism includes a base, and screw mounting vertical plates are symmetrically provided on both sides of the top of the base. A screw is installed on the screw mounting vertical plates. The screw is connected to a drive motor. A lifting seat is fixed on the nut seat of the screw, and the lifting seat is fixed to the bottom of the bed support or the bottom of the treatment bed.

[0007] The hard limit device comprises an upper limit switch and a lower limit switch fixed on the surface of the lead screw mounting vertical plate and a stopper fixed on the lifting seat, wherein the stopper is located between the upper limit switch and the lower limit switch.

[0008] The utility model also comprises a controller, and a pressure sensor, a laser rangefinder, a driving motor, an upper limit switch and a lower limit switch are all connected with the controller.

[0009] The beneficial effects of the utility model are as follows: the utility model improves the efficiency of the treatment bed calibration, can complete the calibration of the Z-axis hard limit, soft limit and bed support linkage at one time, and reduces the time of manual operation; the bed panel and bed support linkage debugging are automatically set through the pressure sensor, which reduces the possibility of human operation errors and avoids the risk of the bed panel bending and deformation due to lowering too low; the fully automatic calibration program and the cooperation of various pressure sensors can effectively reduce the intervention of human factors and ensure the stability and consistency of calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model;

[0011] Figure 2 It is an enlarged view of the sensing part of the pressure sensor;

[0012] In the figure: 1-bed support; 2-treatment bed; 3-conveying roller; 4-pressure sensor; 5-laser rangefinder; 6-bed panel; 7-lifting mechanism; 8-hard limit device;

[0013] 71-base; 72-screw mounting plate; 73-screw; 74-driving motor; 75-screw nut seat; 76-lifting seat;

[0014] 81-upper limit switch; 82-lower limit switch; 83-stopper;

[0015] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0016] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0017] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0020] A Z-axis automatic calibration system for a treatment bed of a spiral tomography radiotherapy device, such as Figure 1 to Figure 2 As shown, it includes a bed support 1 and a treatment bed 2. A plurality of conveying rollers 3 are installed on the top of the bed support 1, wherein pressure sensors 4 are installed in the two conveying rollers 3 close to the treatment bed 2. A laser rangefinder 5 is installed on the end of the top of the bed support 1 close to the treatment bed 2. A bed panel 6 is provided on the top of the treatment bed 2. A lifting mechanism 7 is connected to the bottom of the bed support 1 and the bottom of the treatment bed 2, and a hard limit device 8 is provided on the lifting mechanism 7.

[0021] The lifting mechanism 7 includes a base 71, and screw mounting vertical plates 72 are symmetrically provided on both sides of the top of the base 71. A screw 73 is installed on the screw mounting vertical plates 72. The screw 73 is connected to a driving motor 74. A lifting seat 76 is fixed on the nut seat 75 of the screw 73. The lifting seat 76 is fixed to the bottom of the bed support 1 or the bottom of the treatment bed 2.

[0022] The hard limit device 8 includes an upper limit switch 81 and a lower limit switch 82 fixed on the surface of the screw mounting vertical plate 72 , and a stopper 83 fixed on the lifting seat 76 , wherein the stopper 83 is located between the upper limit switch 81 and the lower limit switch 82 .

[0023] The upper limit switch 81 and the lower limit switch 82 can be conventional products on the market, for example, the Delixi travel switch LXK3-20S / T can be used.

[0024] It also includes a controller, and the pressure sensor 4, the laser rangefinder 5, the drive motor 74, the upper limit switch 81, and the lower limit switch 82 are all connected to the controller.

[0025] The controller can be any conventional product on the market as long as it can achieve the function, for example, a Siemens S7 series PLC can be used.

[0026] The working process of the utility model is as follows:

[0027] S1. Update the existing bed calibration procedure.

[0028] S2. The program only needs to click "Start" to execute the complete Z-axis bed calibration process, including the hard limit and soft limit settings of the Z-axis, as well as the relevant setting processes linked to the bed support 1.

[0029] S21. Z-axis hard limit setting: After ensuring that the bed panel 6 is moved to the position at the tail of the Y-axis, start the Z-axis calibration. The bed panel 6 is controlled by the lifting mechanism 7 at the bottom of the treatment bed 2 to descend, triggering the lower hard limit of the Z-axis, i.e., the lower limit switch 82, recording the original hard limit coordinates, and setting them to 0. The bed panel 6 is controlled by the lifting mechanism 7 at the bottom of the treatment bed 2 to ascend, triggering the upper hard limit of the Z-axis, i.e., the upper limit switch 81, recording the highest hard limit coordinates, and completing the Z-axis hard limit setting.

[0030] S21. Z-axis soft limit setting: Based on the hard limit coordinates, calculate a distance of 1 mm above the original hard limit coordinates and 1 mm below the highest hard limit coordinates, and set them as the soft limit coordinates. The Z-axis soft limit setting is completed through automatic software calculation.

[0031] S3. Linkage debugging of the bed panel 6 and the bed support 1:

[0032] S31. By installing a laser rangefinder 5 on the bed support 1, the distance between the bed panel 6 and the upper surface of the bed support 1 can be accurately read in real time, enabling dynamic control of the distance parameters during the Z-axis calibration process and avoiding excessive bending deformation of the bed panel 6 caused by too large a descent distance.

[0033] S32. Install pressure sensors 4 in two adjacent conveying rollers 3 at the front of the bed support 1 to read the pressure exerted by the bed panel 6 on them. Before the Z-axis calibration, perform the initialization settings of the pressure sensors 4 to make the initial values of the two pressure sensors 4 the same. When the bed panel 6 presses on the two pressure sensors 4, the pressure values F1 and F2 of the two pressure sensors 4 can be read simultaneously. The pressure sensor 4 closer to the bed panel 6 shows F2, and the other shows F1, as Figure 2 shown. When F1 > F2, it indicates that the height of the bed support 1 is too low, and the height of the bed panel 6 needs to be reduced. When F1 < F2, it indicates that the height of the bed support 1 is too high, and the height of the bed panel 6 needs to be increased. When F1 = F2, it indicates that the bed panel 6 is parallel to the bed support 1, and the bed support 1 can horizontally support the bed panel 6. Record the height relationship between the bed support 1 and the bed panel 6 at this time, and complete the linkage setting of the bed support 1 and the bed panel 6.

[0034] S4. The Z-axis calibration of the treatment bed 2 is completed.

[0035] The utility model improves the efficiency of the calibration of the treatment bed 2, and can complete the calibration of the Z-axis hard limit, soft limit and the linkage of the bed support 1 at one time, reducing the time of manual operation; the linkage debugging of the bed panel 6 and the bed support 1 is automatically set by the pressure sensor 4, reducing the possibility of human operation errors and avoiding the risk of the bed panel 6 being bent and deformed due to falling too low; the fully automatic calibration program and the cooperation of each pressure sensor 4 can effectively reduce the intervention of human factors and ensure the stability and consistency of the calibration.

[0036] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A Z-axis automatic calibration system for a treatment bed of a spiral tomography radiotherapy device, characterized in that: The invention comprises a bed support (1) and a treatment bed (2). A plurality of conveying rollers (3) are installed on the top of the bed support (1), wherein two conveying rollers (3) close to the treatment bed (2) are installed with pressure sensors (4). A laser rangefinder (5) is installed on one end of the top of the bed support (1) close to the treatment bed (2). A bed panel (6) is provided on the top of the treatment bed (2). A lifting mechanism (7) is connected to the bottom of the bed support (1) and the bottom of the treatment bed (2). A hard limit device (8) is provided on the lifting mechanism (7).

2. The Z-axis automatic calibration system for a treatment bed of a spiral tomography radiotherapy device according to claim 1, characterized in that: The lifting mechanism (7) comprises a base (71), and screw mounting vertical plates (72) are symmetrically arranged on both sides of the top of the base (71), a screw (73) is mounted on the screw mounting vertical plates (72), the screw (73) is connected to a driving motor (74), a lifting seat (76) is fixed on a nut seat (75) of the screw (73), and the lifting seat (76) is fixed to the bottom of the bed support (1) or the bottom of the treatment bed (2).

3. The Z-axis automatic calibration system for a treatment bed of a spiral tomography radiotherapy device according to claim 2, characterized in that: The hard limit device (8) comprises an upper limit switch (81) fixed on the surface of the screw mounting vertical plate (72), a lower limit switch (82) and a stopper (83) fixed on the lifting seat (76), wherein the stopper (83) is located between the upper limit switch (81) and the lower limit switch (82).

4. The Z-axis automatic calibration system for a treatment bed of a spiral tomography radiotherapy device according to claim 3, characterized in that: It also includes a controller, and the pressure sensor (4), the laser rangefinder (5), the drive motor (74), the upper limit switch (81), and the lower limit switch (82) are all connected to the controller.

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