Radiation filtering device for beam limiter

Abstract

The present invention belongs to the technical field of X-ray auxiliary equipment, and in particular provides a ray filtering device for a beam limiter, including a base, a transmission assembly and a plurality of filters, the transmission assembly and the plurality of filters are fixed on the base, the transmission assembly includes a large pulley, the large pulley is connected to the base through a rotating shaft, the large pulley drives the plurality of filters to rotate to the filtering position, and then the plurality of filters can be brought back to the original position in sequence by reversing according to whether the rays need to be filtered and the degree of filtering required. The present invention is used for soft rays with different degrees of low absorption of primary X-rays with longer wavelengths, and according to different filtering needs, improves the quality of perspective imaging while reducing harm to the human body.

Description

Technical Field

[0001] The invention belongs to the technical field of X-ray auxiliary equipment, and in particular provides a ray filtering device for a beam limiter. Background Art

[0002] X-rays are widely used in medicine because of their penetrating effects, differential absorption, photosensitivity and fluorescence. When X-rays pass through different parts of the human body, they are absorbed to different degrees in different parts of the human body. Therefore, the amount of X-rays passing through different parts of the human body is also different. As a result, the intensity of the fluorescence or photosensitivity produced on the fluorescent screen or photographic film is quite different, which can display shadows representing different densities and provide medical personnel with a basis for diagnosis by imaging on the film.

[0003] However, there are soft rays in X-rays that are harmful to the human body. In order to protect the health of patients, a beam limiter is usually set in the X-ray machine to adjust the size of the human body detection part and filter the soft rays. Usually, a filter is set inside the beam limiter to filter the soft rays. Among them, when the beam limiter responds to different filtering requirements, it is necessary to use filters of different thicknesses to filter different amounts of soft rays, so the filter needs to be replaced. For example, compared with the detection of adults, thicker filters are required for the detection of young children. At present, the mainstream choice of traditional beam limiters is to replace the filter through gear transmission, electromagnet transmission, electric control sliding and other methods. The replacement response speed is slow, occupies a large space, there is noise, and affects the treatment environment. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a ray filtering device for a beam limiter, which is used to absorb soft rays with longer primary X-ray wavelengths, thereby improving the quality of fluoroscopic imaging and reducing harm to the human body.

[0005] The present invention is implemented as follows: a ray filtering device for a beam limiter includes a base, a transmission assembly and a plurality of filters, wherein the transmission assembly and the plurality of filters are fixed on the base, and the transmission assembly includes a large pulley, which is connected to the base through a rotating shaft. After the large pulley drives the plurality of filters to rotate to a filtering position, the plurality of filters can be brought back to the original position in sequence and intermittently by reversing according to whether rays need to be filtered and the degree of filtering required.

[0006] Furthermore, the transmission assembly also includes a motor and a belt, one end of the belt is connected to the motor, and the other end is sleeved on the large pulley.

[0007] Furthermore, two guide adjustment wheels are provided on the base, and the belt has a rotation track fixed by the two guide adjustment wheels.

[0008] Furthermore, a stepped pin is fixedly arranged on the lower surface of the large pulley, and the plurality of filter plates are sequentially connected to the rotating shaft in order from top to bottom, and waist-shaped holes are opened at corresponding positions on the filter plates, and the stepped pin extends into the waist-shaped holes of the plurality of filter plates.

[0009] Furthermore, a plurality of return springs are provided on the base, the other ends of the return springs are connected to the plurality of filters, and the connection position between the return springs and the filters is located outside the connection position between the filters and the rotating shaft, for returning the filters.

[0010] Furthermore, a filter connector is provided on the outside of the filter disc, and the filter connector is made of metal. A positioning magnet is fixed on the base, which is used to adsorb the filter connector to position the filter disc after the filter disc is rotated to the filtering position.

[0011] Furthermore, the plurality of filters include filter A, filter B and filter C, which are sequentially connected to the rotating shaft from top to bottom; depending on whether radiation needs to be filtered and the degree of filtering required, the positions of filter A, filter B and filter C may be as follows:

[0012] 1) Filter A, filter B and filter C are in their original positions at the same time, that is, no radiation needs to be filtered;

[0013] 2) Filter A, filter B and filter C are in the filtering position at the same time, that is, three layers of filters filter the radiation at the same time, and the filtering intensity is the maximum;

[0014] 3) Filter A is in the original position, filter B and filter C are in the filtering position at the same time, and the filtering intensity is less than the second case;

[0015] 4) Filter A and filter B are in their original positions, filter C is in the filtering position, and the filtration intensity is less than that in the third case.

[0016] Furthermore, the lower end of the rotating shaft is connected to the shaft with a retaining ring for preventing the plurality of filters from falling off.

[0017] Furthermore, the base is provided with a plurality of slideway grooves for the filter, and one end of the filter extends into the slideway groove for supporting and guiding the filter.

[0018] Furthermore, it also includes circuit board A, circuit board B and a controller. Circuit board A is arranged on the base directly above the filtering position of the filter, and circuit board B is arranged on the base directly above the original position of the filter. Circuit board A and circuit board B are both provided with reflection sensors with the same number as the filters, and an inverted L-shaped reflection plate is provided on the edge of each filter. After the reflection sensor is directly opposite to the reflection plate, the reflection sensor can receive the reflection signal and transmit it to circuit board A or circuit board B. Circuit board A and circuit board B are respectively connected to the controller, and the controller is also connected to the transmission component, and the rotation direction of the multiple filters is controlled through the transmission component.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] First, the spring returns, and the three-layer filter moves along the shaft, with a short movement distance, fast response speed, and short return time;

[0021] Second, the magnet controls the working position of the filter, which takes up little space, is easy to install and has high reliability;

[0022] Third, the three layers of filter copper sheets are arranged in parallel with a rotating outer frame, which is thin and the thickness of the filter position is controlled within 7mm. The imaging quality is high and the diagonal sliding groove along the base is highly safe.

[0023] Fourth, the number of filtered layers is accurately determined by receiving the signal reflected by each filtered mounting frame through sensors at the starting position and the filtering position;

[0024] Fifth, a guide wheel having a guide wheel and a guide wheel capable of adjusting the tension of the belt;

[0025] Sixth, the motion mechanism, filtering part, motor, belt, control panel, spring, magnet and other fasteners are arranged three-dimensionally, with a compact structure and less space waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention from an oblique upper viewing angle;

[0027] Figure 2 This is a three-dimensional structural diagram of the present invention from an oblique downward viewing angle;

[0028] Figure 3-1 It is a three-dimensional diagram of the step pin;

[0029] Figure 3-2 The main view for the ladder detent;

[0030] Figure 4-1 is a top view of any filter;

[0031] Figure 4-2 is a stereogram of any filter;

[0032] Figure 5-1 It is a bottom-up structural diagram of the connection position of multiple filter plates and a large pulley;

[0033] Figure 5-2 It is a three-dimensional structural diagram of the connection position of multiple filter plates and a large pulley;

[0034] Figure 6 This is a position relationship diagram of the present invention in the beam limiter. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] refer to Figure 1 and Figure 2 The present invention provides a ray filtering device for a beam limiter, comprising a base 1, a transmission assembly and a plurality of filters, the transmission assembly and the plurality of filters are fixed on the base 1, the transmission assembly comprises a large pulley 3, a motor 4 and a belt 9, the large pulley 3 is connected to the base 1 through a rotating shaft 2, one end of the belt 9 is connected to the motor 4, and the other end is sleeved on the large pulley 3, and two guide adjustment wheels 8 are also provided on the base 1, and the belt 9 is fixed with a rotation track by the two guide adjustment wheels 8. After the large pulley 3 drives the plurality of filters to rotate to the filtering position, according to whether the rays need to be filtered and the degree of filtering required, the plurality of filters can be brought back to the original position in sequence and intermittently by reversing.

[0037] In order to prevent the various components on the base 1 from loosening, a motor anti-loosening washer 12 and a motor fixing screw 14 are set at the corresponding positions on the lower surface of the base 1 to fix the motor 4; a guide adjustment wheel anti-loosening washer 13 and a guide adjustment wheel fixing nut 15 are set to fix the guide adjustment wheel 8.

[0038] refer to Figure 3-1 , Figure 3-2 , Figure 4-1 and Figure 4-2 , a step pin 20 is fixedly arranged on the lower surface of the large pulley 3. In this embodiment, the step pin 20 has three steps from top to bottom, and the step width gradually decreases. Figure 5-1 and Figure 5-2 The multiple filter plates are connected to the rotating shaft 2 in order from top to bottom, and waist-shaped holes are opened at corresponding positions on the filter plates. The step pins extend into the waist-shaped holes of the multiple filter plates. The widest step of the first level corresponds to the top filter plate, and each step downwards corresponds to a filter plate.

[0039] A plurality of return springs 16 are provided on the base 1, and the other end of the return spring 16 is connected to the plurality of filter sheets ( Figure 1 and Figure 2 In the figure, for the convenience of drawing, the return spring 16 is not connected to the filter. In actual application, the other end of the return spring 16 is connected to the small hole 25 on the filter), and the connection position of the return spring 16 and the filter is located outside the connection position of the filter and the rotating shaft 2, which is used to return the filter.

[0040] A filter connector 26 is arranged on the outside of the filter disc. The filter connector is made of metal. A positioning magnet 17 is fixed on the base 1 for adsorbing the filter connector to position the filter disc after the filter disc rotates to the filtering position.

[0041] Taking into account the need to filter soft rays, in this embodiment, the plurality of filters are preferably three, including filter A5, filter B6 and filter C7, which are sequentially connected to the rotating shaft 2 from top to bottom; depending on whether rays need to be filtered and the degree of filtering required, the positions of filter A5, filter B6 and filter C7 may be as follows:

[0042] 1) Filter A5, filter B6 and filter C7 are in the original position at the same time, that is, no radiation needs to be filtered, which can be understood as level 0 filtration;

[0043] 2) Filter A5, filter B6 and filter C7 are in the filtering position at the same time, that is, three layers of filters filter the radiation at the same time, and the filtering intensity is the maximum, which can be understood as three-level filtration;

[0044] 3) Filter A5 is in the original position, filter B6 and filter C7 are in the filtering position at the same time, and the filtering intensity is less than the second case, which can be understood as level 2 filtration;

[0045] 4) Filter A5 and filter B6 are in the original positions, filter C7 is in the filtering position, and the filtration intensity is less than the third case, which can be understood as level 1 filtration.

[0046] The lower end of the rotating shaft 2 is connected to a shaft retaining ring 10 for preventing the plurality of filters from falling off.

[0047] The base 1 is also provided with a plurality of slide grooves 27 for the filter, one end of the filter extends into the slide groove to support and guide the filter, and the center of the structure formed by the slide groove 27 and the base 1 is the area where the filter moves.

[0048] In order to realize intelligent control of the present invention, it also includes a circuit board A11, a circuit board B19 and a controller. The circuit board A11 is arranged on the base 1 just above the filtering position of the filter, and the circuit board B19 is arranged on the base 1 just above the original position of the filter, and the circuit board A11 and the circuit board B19 are both provided with reflection sensors with the same number as the filter. In this embodiment, the model of the transmitting sensor is SFH9240, and an inverted L-shaped reflection sheet is arranged at the edge of each filter. After the reflection sensor is directly opposite to the reflection sheet, the reflection sensor can receive the reflection signal and transmit it to the circuit board A11 or the circuit board B19. The circuit board A11 and the circuit board B19 are respectively connected to the controller, and the controller is also connected to the transmission assembly. Through the transmission assembly, the rotation direction of multiple filters can be controlled. Different buttons (such as 0-level filtering button, 3-level filtering button, 2-level filtering button, 1-level filtering button) can be set on the controller, and different buttons are used to give signals to control the rotation direction of the filter.

[0049] refer to Figure 6 When the tester or the test site does not need to filter radiation, keep filter A5, filter B6, and filter C7 in the starting position. At this time, the three sensors on the circuit board B19 will read the position information of filter A5, filter B6, and filter C7 and transmit it to the controller;

[0050] When the examinee or the examined part needs high-intensity filtered radiation, the operator presses the 3-stage filtering button, and the motor 4 drives the large pulley 3 to rotate through the belt 9 and the guide adjustment wheel 8. When the large pulley 3 rotates, the stepped pin drives the filter A5, filter B6, and filter C7 to rotate toward the filtering position by clamping one side of the waist-shaped hole of the filter A5, filter B6, and filter C7 until they reach the filtering position and are locked in the filtering position by the positioning magnet 17; at this time, the position signals of the filter A5, filter B6, and filter C7 received by the sensor on the circuit board B19 will disappear, and the filter A5 will appear on the circuit board A11. , filter B6, filter C7 position signals, and transmit them to the controller. At this time, filter A5, filter B6, filter C7 are three layers filtering rays. When it is necessary to reduce the filtering intensity, the operator presses the 2nd level filtering button, and the motor 4 drives the large pulley 3 to rotate in the opposite direction through the belt 9 and the guide adjustment wheel 8. When the large pulley 3 rotates 85-90 degrees in the opposite direction, the stepped pin on the large pulley 3 will push the filter A5 out of the lock of the positioning magnet 17, and return to the starting position under the action of the return spring 16. At this time, the filter A5 position signal received on the circuit board A11 The signal disappears, and the signal of filter A5 appears on the sensor on circuit board B19; if the filtering intensity needs to be further reduced, the operator presses the 1st level filtering button, and the motor 4 drives the large pulley 3 to continue rotating in the opposite direction through the belt 9 and the guide adjustment wheel 8. When the large pulley 3 rotates 100-105 degrees in the opposite direction, the stepped pin on the large pulley 3 will push the filter B6 out of the lock of the positioning magnet 17 and return to the starting position on the action line of the return spring 16. At this time, the in-position signal of filter B6 on circuit board A11 also disappears, and the filter on the sensor on circuit board B19 The signal of filter plate B6 also appears; when the three-layer filtration of the ray filtering device needs to be reset to the starting position, the operator presses the 0-level filtration button, and the motor 4 drives the large pulley 3 to continue rotating in the opposite direction through the belt 9 and the guide adjustment wheel 8. When the large pulley 3 rotates 115-120 degrees in the opposite direction, the stepped pin on the large pulley 3 will move the filter plate C5 out of the lock of the positioning magnet 17 and return to the starting position on the action line of the return spring 16. At this time, the position signal of filter plate C7 on circuit board A11 also disappears, and the signal of filter plate C7 on the sensor on circuit board B19 also appears. The whole process is carried out in a cycle according to the steps described above, with the stepped pin moving filter plates A5, filter plates B6, and filter plates C7 in turn.

Claims

1. A ray filter for a beam limiter, It is characterized in that The invention comprises a base (1), a transmission assembly and a plurality of filter plates, wherein the transmission assembly and the plurality of filter plates are fixed on the base (1), and the transmission assembly comprises a large pulley (3), wherein the large pulley (3) is connected to the base (1) via a rotating shaft (2), and after the large pulley (3) drives the plurality of filter plates to rotate to a filtering position, the plurality of filter plates can be brought back to the original position in sequence and intermittently by reversing according to whether radiation needs to be filtered and the degree of filtering required; A stepped pin (20) is fixedly arranged on the lower surface of the large pulley (3), and the plurality of filter plates are sequentially connected to the rotating shaft (2) in order from top to bottom, and waist-shaped holes are opened at corresponding positions on the filter plates, and the stepped pins extend into the waist-shaped holes of the plurality of filter plates. The stepped pins (20) have three steps from top to bottom, and the step width gradually decreases. The first step with the widest width corresponds to the top filter plate, and each step corresponds to a filter plate in order from top to bottom. The base (1) is provided with a plurality of return springs (16), the other ends of the return springs (16) are connected to the plurality of filter plates, and the connection position between the return springs (16) and the filter plates is located outside the connection position between the filter plates and the rotating shaft (2), so as to return the filter plates; The plurality of filters include filter A (5), filter B (6) and filter C (7), which are connected to the rotating shaft (2) in order from top to bottom; depending on whether radiation needs to be filtered and the degree of filtering required, the positions of filter A (5), filter B (6) and filter C (7) may be as follows: 1) Filter A (5), filter B (6) and filter C (7) are in their original positions at the same time, i.e., no radiation needs to be filtered; 2) Filter A (5), filter B (6) and filter C (7) are in the filtering position at the same time, that is, three layers of filters filter the radiation at the same time, and the filtering intensity is the highest; 3) Filter A (5) is in the original position, filter B (6) and filter C (7) are in the filtering position at the same time, and the filtering intensity is less than that in case 2); 4) Filter A (5) and filter B (6) are in their original positions, and filter C (7) is in the filtering position. The filtering intensity is less than that in case 3).

2. The ray filtering device for a beam limiter according to claim 1, It is characterized in that The transmission assembly further comprises a motor (4) and a belt (9); one end of the belt (9) is connected to the motor (4), and the other end is sleeved on the large pulley (3).

3. The ray filtering device for a beam limiter as claimed in claim 2, It is characterized in that The base (1) is also provided with two guide adjustment wheels (8), and the rotation track of the belt (9) is fixed by the two guide adjustment wheels (8).

4. The ray filtering device for a beam limiter according to claim 1, It is characterized in that A filter connecting piece is arranged on the outside of the filter disc, and the filter connecting piece is made of metal. A positioning magnet (17) is fixed on the base (1) for adsorbing the filter connecting piece to position the filter disc after the filter disc is rotated to the filtering position.

5. The ray filtering device for a beam limiter according to claim 1, It is characterized in that The lower end of the rotating shaft (2) is connected to a shaft retaining ring (10) for preventing the plurality of filter plates from falling off.

6. The ray filtering device for a beam limiter according to claim 1, It is characterized in that The base (1) is also provided with a plurality of slide grooves for the filter plate, and one end of the filter plate extends into the slide groove for supporting and guiding the filter plate.

7. The ray filtering device for a beam limiter according to claim 1, It is characterized in that The invention also comprises a circuit board A (11), a circuit board B (19) and a controller. The circuit board A (11) is arranged on the base (1) directly above the filtering position of the filter, and the circuit board B (19) is arranged on the base (1) directly above the original position of the filter. The circuit board A (11) and the circuit board B (19) are both provided with reflection sensors having the same number as the number of the filter plates. An inverted L-shaped reflection plate is provided at the edge of each of the filter plates. When the reflection sensor faces the reflection plate, the reflection sensor can receive a reflection signal and transmit it to the circuit board A (11) or the circuit board B (19). The circuit board A (11) and the circuit board B (19) are respectively connected to the controller. The controller is also connected to the transmission component. The rotation direction of the plurality of filter plates is controlled through the transmission component.

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