Shielding assembly for speed limiter and adjustable shielding device

Abstract

The utility model belongs to the technical field of beam limiting devices, and particularly relates to a shielding assembly for a speed limiter and an adjustable shielding device. The fixed lead window comprises a fixed bracket and a rounded rectangular lead window, and a rectangular opening is formed in the lead window; the aperture adjusting part comprises a base and a pressing ring, an annular groove is formed in the base, a rotatable rotating disc is arranged in the annular groove, the pressing ring is used for abutting the rotating disc into the annular groove, a plurality of radial sliding grooves are formed in the rotating disc, and a plurality of shielding blades stacked layer by layer are arranged between the rotating disc and the base. The upper ends and the lower ends of the shielding blades are hinged to the rotating disc and the base through upper pin shafts and lower pin shafts respectively, the upper pin shafts are slidably installed in the radial sliding grooves, the rotating disc is rotated so that the upper pin shafts can slide in the radial sliding grooves in the direction close to or away from the center of the rotating disc, and the upper ends of the shielding blades are driven to be close to or away from each other. The shielding range of the shielding blade is adjusted; the shielding efficiency, the shielding utilization rate and the imaging quality of the beam limiting device are improved.

Description

Technical Field

[0001] This utility model belongs to the field of beam limiter technology, specifically relating to a shielding component and an adjustable shielding device for a speed limiter. Background Technology

[0002] X-ray diagnostic technology uses X-rays to penetrate human tissues. Because different tissues absorb X-rays to varying degrees, images of varying brightness are formed on film or digital imaging equipment, helping doctors observe the internal structure of the human body to diagnose diseases. With the continuous improvement of medical diagnostic levels and people's increasing attention to health, the application of X-ray diagnostic technology is becoming more and more widespread.

[0003] However, excessive radiation is harmful to the human body. To protect patients' health, a beam limiter is usually installed in X-ray diagnostic equipment to control the direction, shape, and range of the X-ray beam. This reduces the projection range while still meeting imaging and diagnostic requirements, preventing radiation from spreading to non-examination areas or the surrounding environment, thus reducing unnecessary radiation exposure. It also reduces scattered radiation, preventing image blurring or artifacts, thereby improving image contrast and clarity. The shielding device of the beam limiter is a key component in controlling the projection range of the X-ray beam. Existing shielding devices typically use a circular outer frame with a rectangular hole in the center. Because there is a large redundant space between the circular lead window and the internal rectangular hole, the penumbra of the X-ray beam expands in the edge region, increasing the probability of scattering with the patient. This results in low shielding utilization and efficiency, and the shielding device has low strength, complex structure, and low assembly efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a shielding component and an adjustable shielding device for a speed limiter, so as to at least solve the problems in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A shielding assembly for a speed limiter includes a fixed lead window and an aperture adjustment component connected in sequence. The fixed lead window includes a fixed bracket with a rounded rectangular lead window and a rectangular opening. The aperture adjustment component includes a fixedly connected base and a pressure ring. The base has an annular groove with a rotatable turntable inside. The pressure ring is used to press the turntable against the annular groove. The turntable has multiple radial grooves evenly distributed around its circumference. Multiple shielding blades are evenly distributed around the turntable and the base, stacked layer by layer. The upper and lower ends of the shielding blades are hinged to the turntable and the base respectively by an upper pin and a lower pin. The upper pin is slidably installed in the radial groove. Rotating the turntable allows the upper pin to slide in the radial groove towards or away from the center of the turntable, causing the upper ends of the shielding blades to move closer or further apart, thereby adjusting the shielding range of the shielding blades.

[0007] Furthermore, the base is provided with an upper connecting plate, and the pressure ring is integrally made by injection molding. The outer edge and bottom of the pressure ring are respectively formed with a flange plate and a limiting protrusion. The flange plate is fixedly connected to the upper connecting plate of the base, and the limiting protrusion is used to press the turntable against the annular groove of the base.

[0008] Furthermore, a guide ring is formed on the pressure ring, and a follower plate is fixed on the rotating disk. The free end of the follower plate is slidably engaged with the guide ring. When the free end of the follower plate is located at both ends of the guide ring, the shielding range of the shielding blade is at its maximum or minimum.

[0009] Furthermore, the bottom of the base is provided with a boss.

[0010] Furthermore, the fixed bracket is provided with multiple clearance slots.

[0011] An adjustable shielding device for a speed limiter includes the aforementioned shielding assembly and a drive assembly. The drive assembly includes a drive component and a control component. The drive component drives a turntable to rotate, and the control component controls the start and stop of the drive component to adjust the shielding range of the shielding blades.

[0012] Furthermore, the driving component includes a mounting bracket and a drive motor, a driving wheel, a driven wheel, and a timing belt mounted on the mounting bracket. The driving wheel is fixed to the output end of the drive motor. The driven wheel includes an upper gear and a lower gear that are coaxially fixedly connected. The timing belt meshes with the driving wheel and the lower gear. The outer edge of the turntable of the shielding assembly is provided with multiple toothed grooves. The upper connecting plate of the base is provided with a notch. Part of the turntable protrudes from the notch, and the protruding part of the turntable meshes with the upper gear.

[0013] Furthermore, the control unit includes a controller and a position sensor. The controller is electrically connected to the position sensor and the drive motor. The position sensor is used to detect the position of the follower plate and send a signal to the controller. The controller is used to receive the signal from the position sensor and control the start and stop of the drive motor.

[0014] Furthermore, it also includes a substrate, with a lower connecting plate on the base, and both the lower connecting plate and the mounting bracket are fixed on the substrate.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects:

[0016] 1. Compared with the traditional lead window structure with a circular center and a rectangular hole, the lead window of this utility model adopts a rounded rectangle structure with a rounded center and a rectangular hole. Since the rounded rectangular frame is closer to the common irradiation areas of the human body, such as the chest and abdomen, it can reduce the ineffective area. In addition, the rounded corner structure of the lead window can also reduce Compton scattering between the rays and the edge of the lead window. The outer perimeter of the rounded rectangle is closer to the shape of the inner rectangular hole, which can reduce redundant space, shrink the penumbra area, and thus reduce the edge scattering volume. The rounded corner design can also reduce the diffraction effect caused by sharp edges, further suppressing scattering, thus reducing scattered radiation and significantly improving shielding efficiency and imaging quality. In addition, the use of a rounded outer frame can also reduce the amount of lead used while ensuring shielding efficiency, reducing the overall weight and manufacturing cost of the shielding device and improving the shielding utilization rate.

[0017] 2. Compared with the traditional gear disc pressure ring assembly made of sheet metal and plastic parts, the pressure ring of this utility model, which is made of injection molding in one piece, can not only improve the production and assembly efficiency of the shielding components and reduce the manufacturing cost, but also reduce the risk of pressure ring deformation and jamming. Attached Figure Description

[0018] Figure 1 This is an exploded view of the shielding component of this utility model;

[0019] Figure 2 This is a cross-sectional view of the shielding component of this utility model;

[0020] Figure 3 This is a schematic diagram of the shielding device of this utility model;

[0021] Figure 4 This is a structural view of the driving component.

[0022] In the picture:

[0023] Fixed lead window 100, fixed bracket 110, clearance groove 111, lead window 120, rectangular opening 121;

[0024] Aperture adjustment component 200, base 210, annular groove 211, upper connecting plate 212, lower connecting plate 213, boss 214, pressure ring 220, flange plate 221, limiting protrusion 222, guide ring 223, turntable 230, radial slide 231, toothed groove 232, shielding blade 240, upper pin 241, lower pin 242, follower plate 250;

[0025] Drive assembly 300, mounting bracket 310, drive motor 320, drive wheel 330, driven wheel 340, upper gear 341, lower gear 342, timing belt 350;

[0026] Substrate 400. Detailed Implementation

[0027] The following detailed description illustrates the specific implementation method:

[0028] Example

[0029] like Figure 1 As shown, a shielding assembly for a speed limiter includes a fixed lead window 100 and an aperture adjustment component 200 connected in sequence. The fixed lead window 100 includes a fixed bracket 110, the edge of which has multiple clearance grooves 111, and a rounded rectangular lead window 120 is fixed to the fixed bracket 110 by screws. The lead window 120 has a rectangular opening 121 at its center.

[0030] The lead window 120 of this invention adopts a structure with a rounded rectangle and a rectangular hole in the center. Since the rounded rectangle frame is closer to the common irradiation areas of the human body, such as the chest and abdomen, it can reduce the ineffective area. In addition, the rounded corner structure of the lead window 120 can also reduce Compton scattering of rays with the edge of the lead window 120. The outer periphery of the rounded rectangle is closer to the shape of the inner rectangular hole, which can reduce redundant space, shrink the penumbra area, and thus reduce the edge scattering volume. The rounded corner design can also reduce the diffraction effect caused by sharp edges, further suppressing scattering, thus reducing scattered radiation and significantly improving shielding efficiency and imaging quality. In addition, the use of a rounded outer frame can reduce the amount of lead used while ensuring shielding efficiency, thereby reducing the overall weight and manufacturing cost of the shielding device and improving the shielding utilization rate.

[0031] like Figure 1-2As shown, the aperture adjustment component 200 includes a fixedly connected base 210 and a pressure ring 220. The base 210 has an annular groove 211, within which a rotatable turntable 230 is installed. The base 210 is formed with an upper connecting plate 212, a lower connecting plate 213, and a boss 214. The pressure ring 220 is integrally manufactured using injection molding. The outer edge and bottom of the pressure ring 220 are respectively formed with a flange plate 221 and a limiting protrusion 222. The flange plate 221 is fixedly connected to the upper connecting plate 212 by screws. The limiting protrusion 222 at the bottom of the pressure ring 220 can press the turntable 230 against the annular groove 211 of the base 210. The turntable 230 has multiple radially distributed grooves 231 circumferentially. Eight shielding blades 240 are provided between the turntable 230 and the base 210. The shielding blades 240 are evenly distributed and stacked in layers around the circumference. The upper and lower ends of the shielding blades 240 are hinged to the turntable 230 and the base 210 respectively through the upper pin 241 and the lower pin 242. The upper pin 241 can be slidably installed in the radial groove 231. Rotating the turntable 230 can cause the upper pin 241 to slide in the radial groove 231 towards or away from the center of the turntable 230, causing the upper ends of the shielding blades 240 to move closer or further away from each other, so as to adjust the shielding range of the shielding blades 240. The pressure ring 220 is also formed with a guide ring 223. The follower plate 250 is fixed on the turntable by screws. The free end of the follower plate 250 is slidably engaged with the guide ring 223. When the free end of the follower plate 250 is located at both ends of the guide ring 223, the shielding range of the shielding blades 240 is at its maximum or minimum.

[0032] The pressure ring 220 of this utility model is an integrally molded injection part, which can not only improve the production and assembly efficiency of the shielding component and reduce the manufacturing cost, but also reduce the risk of deformation and jamming of the pressure ring 220. In addition, by setting the clearance groove 111 on the fixed bracket 110, the fixed bracket 110 can be prevented from blocking when assembling the aperture adjustment component 200, thus improving the assembly efficiency. By setting the boss 214 at the bottom of the base 210, the centering of the shielding component can be increased, further ensuring the accuracy of the cooperation and alignment of the various parts of the shielding component, and ensuring the performance reliability of the shielding component after assembly.

[0033] like Figure 3-4As shown, an adjustable shielding device for a speed limiter includes the aforementioned shielding assembly, a drive assembly 300, and a base plate 400. The lower connecting plate 213 of the shielding assembly base 210 is fixed to the base plate 400 by screws. The drive assembly 300 includes a drive component and a control component. The drive component drives the turntable 230 to rotate, and the control component controls the lifting and closing of the drive component to adjust the shielding range of the shielding blades 240. The drive component includes a mounting bracket 310 and a drive motor 320, a drive wheel 330, a driven wheel 340, and a synchronous belt 350 mounted on the mounting bracket 310. The mounting bracket 310 is fixed to the base plate 400 by screws. The drive wheel 330 is fixed to the output end of the drive motor 320. The driven wheel 340 includes an upper gear 341 and a lower gear 342 coaxially fixedly connected. The stepper belt 350 meshes with the drive wheel 330 and the lower gear 342; the outer edge of the turntable 230 of the shielding assembly is provided with multiple toothed grooves 232, the upper connecting plate 212 of the base 210 is provided with a notch, part of the turntable 230 protrudes from the notch, and the protruding part of the turntable 230 meshes with the upper gear 341; the control component includes a controller and a position sensor, the controller is electrically connected to the position sensor and the drive motor 320, the position sensor is used to detect the position of the follower plate 250 and send a signal to the controller, the controller is used to control the start and stop of the drive motor 320 according to the signal of the position sensor.

[0034] When it is necessary to adjust the shielding range of the shielding blades 240, the drive motor 320 drives the drive wheel 330 to rotate, and the synchronous belt 350 transmits power to the driven wheel 340, causing the driven wheel 340 to rotate synchronously. The pinion gear of the driven wheel 340 further transmits power to the turntable 230, and the turntable 230 drives the upper ends of all the shielding blades 240 to move closer or further apart, thereby adjusting the shielding range. During the rotation of the turntable 230, the follower plate 250 rotates synchronously with the turntable 230. The position of the follower plate 250 is detected by the position sensor, which can provide feedback on the rotation angle of the shielding blades 240, thereby achieving precise control of the shielding range.

[0035] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A shielding assembly for a speed limiter, characterized in that: The device includes a fixed lead window (100) and an aperture adjustment component (200) connected in sequence. The fixed lead window (100) includes a fixed bracket (110), on which a lead window (120) with rounded corners is provided, and the lead window (120) has a rectangular opening (121). The aperture adjustment component (200) includes a fixedly connected base (210) and a pressure ring (220). The base (210) has an annular groove (211) inside, and a rotatable turntable (230) is provided inside the annular groove (211). The pressure ring (220) is used to press the turntable (230) against the annular groove (211). The turntable (230) has multiple radial grooves (231) evenly distributed around its circumference. Multiple shielding blades (240) are evenly distributed circumferentially between the turntable (230) and the base (210). The multiple shielding blades (240) are stacked layer by layer. The upper and lower ends of the shielding blades (240) are hinged to the turntable (230) and the base (210) respectively through the upper pin (241) and the lower pin (242). The upper pin (241) can be slidably installed in the radial groove (231). Rotating the turntable (230) can make the upper pin (241) slide in the radial groove (231) towards or away from the center of the turntable (230), causing the upper ends of the shielding blades (240) to move closer or further away from each other, so as to adjust the shielding range of the shielding blades (240).

2. The shielding assembly for a speed limiter according to claim 1, characterized in that: The base (210) is provided with an upper connecting plate (212). The pressure ring (220) is integrally made by injection molding. The outer edge and bottom of the pressure ring (220) are respectively formed with a flange plate (221) and a limiting protrusion (222). The flange plate (221) is fixedly connected to the upper connecting plate (212) of the base (210). The limiting protrusion (222) is used to press the turntable (230) against the annular groove (211) of the base (210).

3. The shielding assembly for a speed limiter according to claim 2, characterized in that: A guide ring (223) is formed on the pressure ring (220), and a follower plate (250) is fixed on the rotating disk. The free end of the follower plate (250) is slidably engaged with the guide ring (223). When the free end of the follower plate (250) is located at both ends of the guide ring (223), the shielding range of the shielding blade (240) is at its maximum or minimum.

4. The shielding assembly for a speed limiter according to claim 3, characterized in that: The base (210) has a boss (214) at its bottom.

5. The shielding assembly for a speed limiter according to claim 4, characterized in that: The fixed bracket (110) is provided with multiple clearance slots (111).

6. An adjustable shielding device for a speed limiter, characterized in that: The shielding component and the drive component (300) according to any one of claims 1-5 are included. The drive component (300) includes a drive member and a control member. The drive member is used to drive the turntable (230) to rotate, and the control member is used to control the start and stop of the drive member to adjust the shielding range of the shielding blade (240).

7. The adjustable shielding device for a speed limiter according to claim 6, characterized in that: The drive component includes a mounting bracket (310) and a drive motor (320), a drive wheel (330), a driven wheel (340), and a timing belt (350) mounted on the mounting bracket (310). The drive wheel (330) is fixed to the output end of the drive motor (320). The driven wheel (340) includes an upper gear (341) and a lower gear (342) that are coaxially fixedly connected. The timing belt (350) meshes with the drive wheel (330) and the lower gear (342). The outer edge of the turntable (230) of the shielding component is provided with multiple tooth grooves (232). The upper connecting plate (212) of the base (210) is provided with a notch. Part of the turntable (230) protrudes from the notch, and the protruding part of the turntable (230) meshes with the upper gear (341).

8. The adjustable shielding device for a speed limiter according to claim 7, characterized in that: The control unit includes a controller and a position sensor. The controller is electrically connected to the position sensor and the drive motor (320). The position sensor is used to detect the position of the follower plate (250) and send a signal to the controller. The controller is used to receive the signal from the position sensor and control the start and stop of the drive motor (320).

9. The adjustable shielding device for a speed limiter according to claim 8, characterized in that: It also includes a substrate (400), a base (210) with a lower connecting plate (213) on it, and the lower connecting plate (213) and the mounting bracket (310) are both fixed on the substrate (400).

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