Knob structure for a beam stop and beam stop structure

Abstract

The utility model provides a knob structure for beam limiter and beam limiter structure, the utility model discloses a knob structure for beam limiter includes: knob fixed plate, fixedly installed on the beam limiter, rotating shaft fixed seat, fixedly installed on the one side of knob fixed plate away from the beam limiter, rotating disc, rotation is connected on the one side of knob fixed plate close to the beam limiter, rotating shaft, passes through rotating shaft fixed seat and knob fixed plate, with Rotating disc fixed connection, damping device, set up between knob fixed plate and rotating shaft fixed seat. When the ambient temperature changes cause the thermal expansion and cold shrink of steel wire rope, the damping device can dynamically compensate the tension change of steel wire rope.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a knob structure and a clamping device structure for a clamping device. Background Technology

[0002] The collimator is a key component for controlling the X-ray field of view. Its core function is to precisely limit the radiation area of ​​X-rays by adjusting the opening and closing of the lead sheet. This ensures the effective irradiation range required for imaging while minimizing unnecessary radiation exposure for patients and medical staff, making it an important device for ensuring medical safety and image quality. Manual collimators, a common type, rely on a mechanical transmission structure using a knob. The operator applies torque by rotating the knob, which is transmitted to a steel cable via a rotating shaft, and then converted into a pulling force to drive the lead sheet through a V-shaped wheel, ultimately adjusting the opening and closing of the lead sheet. During this process, the consistency between the knob's indicated scale and the actual opening and closing degree of the lead sheet directly determines the collimation accuracy, and stable knob operation is a prerequisite for ensuring this consistency.

[0003] However, the knob-driven structure of traditional manual collimators has significant limitations: due to the elastic deformation characteristics of the steel wire rope, internal stress is easily generated after repeated force operations, and this internal stress changes with the number of uses and the magnitude of the tension; at the same time, fluctuations in ambient temperature cause the steel wire rope to expand and contract, further altering its tension. These factors combined can cause the knob to "spring back" after the operator releases it—that is, the knob automatically rotates a certain angle, causing the indicated scale to deviate from the actual position of the lead sheet. The dangers of this deviation are particularly prominent: if the indicated scale shows the lead sheet is closed to the preset range, but the actual opening and closing of the lead sheet is too large due to the springback, the patient will receive an excessive dose of X-ray radiation, increasing health risks; conversely, if the indicated scale shows the opening and closing is as required, but the actual opening and closing of the lead sheet is excessive due to the springback, it may not be able to cover the area to be imaged, requiring readjustment, which not only reduces diagnostic efficiency but may also further increase radiation risks due to repeated irradiation. In addition, inconsistent operation of the knob due to unstable force (such as sometimes too loose and sometimes stuck) will reduce the user experience of medical staff and affect their confidence in operation.

[0004] In existing technologies, such problems are often mitigated through periodic calibration. However, the calibration process requires professional personnel and cannot fundamentally eliminate the continuous impact of environmental factors (such as temperature) and internal stress in the wire rope on the stability of the knob, making it difficult to achieve long-term reliable precision control. Therefore, there is an urgent need for an improved structure that can counteract the internal stress in the wire rope, suppress knob rebound, and improve operational stability, in order to solve the problems of traditional manual clamping devices being greatly affected by the environment, experiencing accuracy fluctuations, and having a poor user experience. Utility Model Content

[0005] In view of the problems existing in the prior art of forming a beam limiter, this application provides a knob structure and a beam limiter structure for a beam limiter, which solves the problem of inaccurate knob accuracy of the beam limiter due to environmental influences such as temperature in the prior art.

[0006] To achieve the above and other related objectives, this utility model provides a knob structure for a clamp limiter, comprising:

[0007] A knob fixing plate is fixedly installed on the clamp limiter;

[0008] A rotating shaft fixing seat is fixedly installed on the side of the knob fixing plate away from the clamping device;

[0009] A rotating disk is rotatably connected to the knob fixing plate on the side near the clamping device;

[0010] A rotating shaft passes through the rotating shaft fixing seat and the knob fixing plate, and is fixedly connected to the rotating disk;

[0011] A damping device is disposed between the knob fixing plate and the rotating shaft fixing seat.

[0012] Optionally, the damping device includes:

[0013] The first gasket is fixedly installed on the side of the knob fixing plate near the rotating disk;

[0014] The second gasket is fixedly installed on the side of the rotating disk near the knob fixing plate, and is arranged opposite to the first gasket;

[0015] An elastic element is disposed between the first gasket and the second gasket, and the elastic element is in contact with the first gasket and the second gasket.

[0016] Optionally, the elastic element includes a spring or a wave washer.

[0017] Optionally, the knob for the clamping device further includes a damping adjustment structure for adjusting the extension and retraction length of the elastic element.

[0018] Optionally, the damping adjustment structure includes an adjustment bolt, which is disposed on the rotating disk.

[0019] Optionally, the rotating shaft is provided with protruding structures distributed at both ends of the rotating shaft fixing seat.

[0020] Optionally, the rotating disk is also provided with fixing bolts for fixing the wire rope.

[0021] Optionally, it also includes:

[0022] A limiting ring is fixedly disposed on the side of the rotating shaft near the rotating shaft fixing seat, and the limiting ring rotates synchronously with the rotating shaft;

[0023] The limiting block is fixedly mounted on the rotating shaft fixing seat, and the limiting block is located in the rotation plane formed by the rotation of the limiting ring.

[0024] Optionally, it also includes: a knob box, detachably connected to the end of the rotating shaft away from the rotating disk.

[0025] Another aspect of this utility model provides a beam limiter structure, comprising:

[0026] The limiter body has an openable lead sheet inside.

[0027] The knob structure includes any one of the knob structures for a clamping device described above, wherein the knob structure is disposed on the clamping device body and is used to adjust the opening and closing size of the lead sheet.

[0028] As described above, the knob structure and clamp limiter structure for the clamp limiter provided by this utility model have at least the following beneficial technical effects:

[0029] The knob structure for the limiter provided in this embodiment allows for dynamic compensation of tension fluctuations in the wire rope tension caused by thermal expansion and contraction due to changes in ambient temperature. When the temperature rises, the wire rope relaxes, and the elastic force of the elastic element pushes the pressure between the second pad and the rotating disk and the first pad and the knob fixing plate to remain stable, thus maintaining friction. When the temperature drops, the wire rope tightens, and the elastic element absorbs some stress through slight deformation, preventing a sudden increase in friction from causing the knob to jam.

[0030] This dynamic compensation capability ensures that the knob torque is unaffected by significant temperature fluctuations, eliminating the need for periodic calibration to correct deviations caused by environmental changes. Furthermore, the locking depth of the elastic element can be set once via the damping adjustment mechanism, eliminating the need for repeated calibrations during subsequent use and maintaining long-term stability of the knob torque, thus freeing it from reliance on periodic calibration. Attached Figure Description

[0031] Figure 1 The diagram shown is a schematic of the knob structure for the clamp provided in Embodiment 1.

[0032] Figure 2 Displayed as Figure 1 Top view of the structure shown.

[0033] Figure 3 The diagram shown is a schematic of the beam limiter transmission structure provided in Embodiment 1.

[0034] Figure 4 Displayed as along Figure 1 The cross-sectional view along the AA' direction is shown.

[0035] Figure 5 The diagram shows the beam limiter structure provided in Embodiment 2.

[0036] Figure Labels

[0037] 1. Knob fixing plate; 2. Rotary shaft fixing seat; 3. Rotary disk; 31. Fixing bolt; 4. Rotary shaft; 41. Protruding structure; 411. First protrusion; 412. Second protrusion; 5. Damping device; 51. First washer; 52. Second washer; 53. Elastic element; 54. Adjusting bolt; 6. Lead sheet; 7. Limiting ring; 8. Limiting block; 9. Knob box; 10. Limiter body. Detailed Implementation

[0038] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0039] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Although the illustrations only show components related to this utility model and are not drawn according to the actual number, shape and size of the components, the shape, quantity, positional relationship and proportion of each component can be arbitrarily changed under the premise of realizing the technical solution of this utility model, and the layout of the components may also be more complex.

[0040] Example 1

[0041] This embodiment provides a knob structure for a clamp limiter, such as... Figure 1 The diagram shown is a schematic of the knob structure for the clamping device provided in this embodiment. Figure 2 Displayed as Figure 1 Top view of the structure shown; by Figure 1 As can be seen from the image, the button for the clamp limiter provided in this embodiment includes a knob fixing plate 1, which is fixedly installed on the clamp limiter; a rotating shaft fixing seat 2, which is fixedly installed on the side of the knob fixing plate 1 away from the clamp limiter; a rotating disk 3, which is rotatably connected to the side of the knob fixing plate 1 close to the clamp limiter; a rotating shaft 4, which passes through the rotating shaft fixing seat 2 and the knob fixing plate 1 and is fixedly connected to the rotating disk 3; and a damping device 5, which is disposed between the knob fixing plate 1 and the rotating shaft fixing seat 2.

[0042] like Figure 3The diagram shown is a schematic of the beam limiter transmission structure provided in this embodiment; as shown... Figure 3 The clamping device shown has two knobs that control the opening and closing of the lead sheet 6 in two different directions (vertical and horizontal). In this embodiment, the two knobs have identical internal structures; therefore, we will use one as an example for illustration. Figure 1 and Figure 2 As shown, the rotating shaft mounting base 2 is fixedly mounted on the knob mounting plate 1 by bolts. Figure 4 As shown, it is displayed along Figure 1 The cross-sectional view along the AA' direction is shown; the rotating shaft 4 is a cylindrical rotating component, which passes through the rotating shaft fixing seat 2 and the knob fixing plate 1 and is fixedly connected to the rotating disk 3. The rotation of the rotating shaft 4 drives the rotating disk 3 to rotate, which is pulled by the steel wire rope wound on the rotating disk.

[0043] like Figure 4 As shown, the rotating shaft 4 is provided with a protruding structure 41, which includes a first protrusion 411 and a second protrusion 412. The first protrusion 411 and the second protrusion 412 are respectively disposed at both ends of the rotating shaft fixing seat 2. Specifically, the first protrusion 411 is located at the end of the rotating shaft 4 away from the knob fixing plate 1, and the second protrusion 412 is located at the end of the rotating shaft 4 closer to the knob fixing plate 1. The distance between the first protrusion 411 and the second protrusion 412 is slightly greater than the thickness of the rotating shaft fixing seat 2. Generally, the distance between the first protrusion 411 and the second protrusion 412 is 0.1 to 0.3 mm greater than the thickness of the rotating shaft fixing seat 2, leaving an assembly gap. The first protrusion 411 and the second protrusion 412 are used to limit the relative position of the rotating shaft fixing seat 2 and the rotating shaft 4. When the rotating shaft 4 attempts to move axially due to vibration or external force, the first protrusion 411 will fit against the end face of the rotating shaft fixing seat 2, and the second protrusion 412 will fit against the other end face of the rotating shaft fixing seat 2. The rigid contact restricts the axial displacement and prevents the rotating shaft 4 from coming out of the rotating shaft fixing seat 2 or from retracting excessively.

[0044] Optionally, the protrusion structure 41 includes a partial protrusion structure or a full-circumferential annular protrusion structure. In this embodiment, the protrusion structure 41 is a full-circumferential annular protrusion structure. Generally, the diameter of the rotating shaft 4 is between 8 and 15 mm, and in this embodiment, the diameter of the rotating shaft 4 is 10 mm. The diameter of the hole passing through the rotating shaft 4 in the rotating shaft fixing seat 2 is reduced to 10.2 mm. The diameter of the protrusion structure 41 is 12 mm.

[0045] like Figure 2 and Figure 4As shown, the damping device 5 includes a first washer 51, fixedly installed on the side of the knob fixing plate 1 near the rotating disk 3; a second washer 52, fixedly installed on the side of the rotating disk 3 near the knob fixing plate 1, with the first washer 51 and the second washer 52 facing each other; and an elastic element 53, disposed between the first washer 51 and the second washer 52, in contact with the first washer 51 and the second washer 52. Specifically, the first washer 51 and the second washer 52 are tightly fitted to the knob fixing plate 1 and the rotating disk 3 respectively, to avoid fluctuations in friction due to uneven contact surfaces.

[0046] Generally, the elastic element 53 includes springs, wave coils, and other elastic devices. Specifically, in this embodiment, a wave coil is used as the elastic element 53, and the free length of the elastic element 53 is slightly larger than the initial distance between the two gaskets to ensure that pre-compression can be generated after assembly.

[0047] Specifically, such as Figure 2 As shown, the button for the limiter also includes a damping adjustment structure for adjusting the extension and retraction length of the elastic element 53. Specifically, in this embodiment, the damping adjustment structure is an adjusting bolt 54, which is mounted on the rotating disk 3. By screwing in the adjusting bolt 54, the second shim 52 is pushed closer to the first shim 51, increasing the compression of the elastic element 53. If the elastic element is a wave coil, the coil compression height can also be indirectly changed by finely adjusting the fixed position of the rotating disk 3 and the rotating shaft 4, thus achieving precise control of the damping force. The continuous frictional force generated by the elastic element 53 can balance the internal stress generated by the repeated force on the wire rope. The damping force prevents the rotating disk from rotating unintended, eliminating the scale deviation caused by the knob's rebound at the source, replacing the passive method that relies on periodic calibration.

[0048] Specifically, the rotating disk 3 is also provided with fixing bolts 31, which are used to fix the wire rope.

[0049] Optionally, such as Figure 1 and Figure 3As shown, the rotating structure for the clamping device also includes a limiting ring 7 and a limiting block 8. The limiting ring 7 is fixedly disposed on the side of the rotating shaft 4 near the rotating shaft fixing seat 2. The limiting ring 7 rotates synchronously with the rotating shaft 4, and the rotation of the limiting ring 7 forms a rotating plane. The limiting block 8 is fixedly disposed on the rotating shaft fixing seat 2 and is located within the rotating plane formed by the limiting ring 7. Specifically, the limiting ring 7 is fixedly connected to the rotating shaft 4, and there is no relative rotation between the limiting ring 7 and the rotating shaft 4. The limiting ring 7 rotates synchronously with the rotating shaft 4, and its axis coincides with the axis of the rotating shaft 4. Specifically, the limiting ring 7 is a fan-shaped structure with a certain thickness, and the angle range of the limiting ring 7 determines the rotation angle of the rotating shaft 4. Generally, the limiting ring 7 forms a fan-shaped area with the axis of the rotating shaft 4 as the center, and the angle of the central angle of the limiting ring 7 is between 30° and 180°. Further, the diameter of the central angle of the limiting ring 7 is between 60° and 120°, and further between 90° and 120°. When the limiting ring 7 rotates with the rotating shaft 4 and rotates to the limiting position, that is, when the limiting ring 7 is in direct contact with the limiting block 8, the limiting block 8 bears the contact stress.

[0050] Optionally, the limiting block 8 is a block structure, including rectangular and cylindrical shapes. In this embodiment, the limiting block 8 includes screws and is fixed to the rotating shaft fixing seat 2. The limiting block 8 is the limiting reference for the limiting ring 7, and the limiting block 8 and the limiting ring 7 are located on the same horizontal plane. When the rotating shaft 4 rotates, it drives the limiting ring 7 to rotate. When it rotates to a certain angle, the limiting ring 7 contacts the limiting block 8, thereby blocking the limiting ring 7 and preventing the rotating shaft 4 from rotating further.

[0051] Optionally, the knob structure for the clamping device also includes a knob box 9, which is detachably connected to the rotating shaft 4. Specifically, the knob box 9 is located at the end of the rotating shaft 4 away from the rotating disk 3. The knob box 9 is a component directly operated by the operator. The knob box 9 is cylindrical in shape and has a grip surface with anti-slip texture to facilitate the application of rotational force. By rotating the knob box 9, the operator transmits torque to the rotating shaft 4 through the detachable connection structure, causing the rotating shaft 4 to rotate synchronously.

[0052] In summary, the knob structure for the limiter provided in this embodiment can dynamically compensate for the tension fluctuations of the wire rope caused by thermal expansion and contraction due to changes in ambient temperature. When the temperature rises, the wire rope loosens, and the elastic force of the elastic element 53 pushes the pressure between the second pad 52 and the rotating disk 3 and the first pad 51 and the knob fixing plate 1 to remain stable, thus maintaining friction. When the temperature drops, the wire rope tightens, and the elastic element 53 absorbs part of the stress through slight deformation, preventing a sudden increase in friction from causing the knob to jam.

[0053] This dynamic compensation capability ensures that the knob torque is not significantly affected by temperature fluctuations, eliminating the need for periodic calibration to correct deviations caused by environmental changes. Furthermore, the locking depth of the elastic element 53 can be set once via the damping adjustment mechanism, eliminating the need for repeated calibration during subsequent use and maintaining long-term stability of the knob torque, thus freeing it from dependence on periodic calibration.

[0054] Example 2

[0055] This embodiment provides a clamping device structure, such as Figure 5 As shown, the clamping device structure of this embodiment includes a clamping device body 10, an openable lead sheet 6 is provided inside the clamping device body 10, and a knob structure is provided on the clamping device body 10 for adjusting the opening size of the lead sheet 6.

[0056] Specifically, the knob structure includes the knob structure for the clamp limiter described in Embodiment 1. Please refer to... Figure 1 The knob fixing plate 1 is fixedly installed inside the limiter body 10, the rotating shaft 4 extends out of the limiter body 10, and the knob box 9 is installed outside the limiter body 10.

[0057] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A knob structure for a clamp limiter, characterized in that, include: A knob fixing plate is fixedly installed on the clamp limiter; A rotating shaft fixing seat is fixedly installed on the side of the knob fixing plate away from the clamping device; A rotating disk is rotatably connected to the knob fixing plate on the side near the clamping device; A rotating shaft passes through the rotating shaft fixing seat and the knob fixing plate, and is fixedly connected to the rotating disk; A damping device is disposed between the knob fixing plate and the rotating shaft fixing seat.

2. The knob structure for a clamp limiter according to claim 1, characterized in that, The damping device includes: The first gasket is fixedly installed on the side of the knob fixing plate near the rotating disk; The second gasket is fixedly installed on the side of the rotating disk near the knob fixing plate, and is positioned opposite to the first gasket; An elastic element is disposed between the first gasket and the second gasket, and the elastic element is in contact with the first gasket and the second gasket.

3. The knob structure for a clamp limiter according to claim 2, characterized in that, The elastic element includes either a spring or a wave washer.

4. The knob structure for a clamp limiter according to claim 2, characterized in that, The knob for the clamping device also includes a damping adjustment structure for adjusting the extension and retraction length of the elastic element.

5. The knob structure for a clamp limiter according to claim 4, characterized in that, The damping adjustment structure includes an adjustment bolt, which is mounted on the rotating disk.

6. The knob structure for a clamp limiter according to claim 1, characterized in that, The rotating shaft is provided with a protruding structure, which is distributed at both ends of the rotating shaft fixing seat.

7. The knob structure for a clamp limiter according to claim 1, characterized in that, The rotating disk is also equipped with fixing bolts for fixing the steel wire rope.

8. The knob structure for a clamp limiter according to claim 1, characterized in that, Also includes: A limiting ring is fixedly disposed on the side of the rotating shaft near the rotating shaft fixing seat, and the limiting ring rotates synchronously with the rotating shaft; The limiting block is fixedly mounted on the rotating shaft fixing seat, and the limiting block is located in the rotation plane formed by the rotation of the limiting ring.

9. The knob structure for a clamp limiter according to claim 1, characterized in that, Also includes: A knob box is detachably connected to the end of the rotating shaft away from the rotating disk.

10. A beam limiter structure, characterized in that, include: The limiter body has an openable lead sheet inside. A knob structure, including the knob structure for a clamping device as described in any one of claims 1 to 9, wherein the knob structure is disposed on the clamping device body and is used to adjust the opening and closing size of the lead sheet.

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