A limiting device for a rotating gantry of a medical accelerator

Abstract

The utility model relates to a kind of limiting device of medical accelerator rotating gantry, its structure is: including pedestal, travel switch, rocker and dial lever assembly;Wherein pedestal is set on fixed gantry, the center of pedestal is rotated and connects the one end of rocker by pivot, the other end of rocker is equipped with hook head;Dial lever assembly is equipped on the outer circumference of rotating gantry;When rotating gantry rotation angle exceeds the limit position angle set, hook head and dial lever assembly are clamped;The end portion of rocker and pedestal cooperation connection is cam structure, travel switch is equipped with contact cam structure when rocker rotates to electrical limit angle, travel switch base and pedestal are connected;Reset device is equipped on rocker.This limiting device can effectively guarantee the rotation angle of medical electronic straight line acceleration rotating gantry, effectively prevent over-angle operation.

Description

Technical Field

[0001] This utility model relates to a limiting device for a rotating gantry of a medical accelerator, belonging to the technical field of medical device components. Background Technology

[0002] The rotation angle of a medical electronic linear accelerator rotating gantry is limited. Exceeding the set angle will damage the water, gas and electricity pipelines in the cable chain, endangering the patient's life. This requires the rotating gantry to have a limit device to forcibly stop the operation of the rotating gantry when the set angle is exceeded. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a limiting device for a medical accelerator rotating gantry, which can effectively ensure the rotation angle of the medical electronic linear accelerator rotating gantry and effectively prevent operation beyond the specified angle.

[0004] To solve the above problems, the specific technical solution of this utility model is as follows: A limiting device for a rotating gantry of a medical accelerator includes a base, a limit switch, a rocker arm, and a lever assembly; wherein the base is set on a fixed frame, and one end of the rocker arm is rotatably connected to the center of the base via a rotating shaft, and the other end of the rocker arm is provided with a hook; a lever assembly is provided on the outer circumference of the rotating frame; when the rotation angle of the rotating frame reaches a set limit angle, the hook engages with the lever assembly; a cam structure is provided at the end of the rocker arm that is connected to the base, and a limit switch is provided at the point where the rocker arm rotates to the electrical limit position, which contacts the cam structure, and the base of the limit switch is connected to the base; a reset device is provided on the rocker arm.

[0005] When the joystick is rotated to its limit position, it is stopped by the deceleration component.

[0006] The deceleration assembly includes a mounting base, a deceleration rod, and a pressure spring; wherein the mounting base is fixedly connected to a fixed frame, and a through hole is provided on the mounting base, the deceleration rod is slidably connected along the through hole, and the axis of the deceleration rod is perpendicular to the contact surface of the rocker arm; a pressure spring is provided on the outer circumference of the deceleration rod, one end of the pressure spring contacts the end of the deceleration rod, and the other end contacts the surface of the mounting base.

[0007] The deceleration assembly includes a buffer tension spring; the rocker arm has a double-layer sliding sleeve structure, the buffer tension spring is located in the inner cavity of the rocker arm, and its two ends are respectively positioned and connected to different sleeves.

[0008] The lever assembly consists of a lever bracket, a shaft, and a roller; the lever bracket has a double-ear structure at its center, and the roller is movably connected within the double-ear structure via the shaft; the hook at the end of the lever has a semi-circular slot, which engages with the roller.

[0009] The reset device is a return spring, one end of which is connected to the outer wall of the rocker arm, and the other end is connected to a fixed frame located above the rocker arm.

[0010] The reset device consists of two return springs, with one end of each spring symmetrically disposed on the outer wall of the rocker arm and the other end symmetrically connected to the base.

[0011] The reset device is a torsion spring, with a limiting post at the middle of the inner circumference of the torsion spring; the rotation shaft of the rocker arm is fixedly set at the center of the base, and the limiting post is inserted into the rotation shaft. After the middle limiting post is inserted, one end of the torsion spring is fixed on the base, which is equivalent to two independent torsion springs. The two ends of the torsion spring are respectively engaged with the positioning holes on both sides of the rocker arm.

[0012] The center point of the rotating frame and the center point of the rocker arm form an axis of symmetry, and the limit switch and the deceleration assembly are symmetrically arranged with the axis of symmetry as the center.

[0013] The hooks are symmetrically arranged on both sides of the rocker arm; when the rotating frame rotates clockwise, the roller engages with the upper hook; when the rotating frame rotates counterclockwise, the roller engages with the lower hook.

[0014] The limiting device for the rotating gantry of the medical accelerator in this application adopts the above-described structure and has the following advantages: 1. The rocker arm adopts a hook structure, which hooks and locks the roller of the lever assembly. The semi-circular slot contains the circular roller, which cannot be disengaged, ensuring safety and reliability. 2. The lever assembly adopts a roller structure, and the movement between it and the rocker arm is a rolling friction motion, which reduces the impact during contact and eliminates the noise of sliding friction; 3. Before the limit action, a deceleration device is used to slow down the rotating frame to avoid collisions and rebounds caused by high-speed movement; 4. When the joystick is locked by the lever assembly, the deceleration assembly also plays its maximum role, providing a double restriction. Attached Figure Description

[0015] Figure 1 A three-dimensional view of the limiting device for the rotating gantry of a medical accelerator.

[0016] Figure 2 This is a 3D view of the deceleration component.

[0017] Figure 3 This is a perspective view of the joystick in Example 1.

[0018] Figure 4 This is a 3D view of the lever assembly.

[0019] Figure 5 This is the main view used in Embodiment 1 of this application.

[0020] Figure 6This is a perspective view of an embodiment of this application.

[0021] Figure 7 This is a three-dimensional view of the joystick in Example 2.

[0022] Figure 8 This is an application state diagram for Embodiment 2 of this application.

[0023] Figure 9 This is a schematic diagram of the torsion spring structure in Example 3.

[0024] Figure 10 A schematic diagram illustrating the interaction between the three torsion springs and the rocker arm. Detailed Implementation Example 1

[0025] like Figures 1 to 5 As shown, a limiting device for a rotating gantry of a medical accelerator includes a base 1, a limit switch 2, a rocker arm 3, and a lever assembly 5. The base 1 is mounted on a fixed frame, and one end of the rocker arm 3 is rotatably connected to the center of the base 1 via a rotating shaft. The other end of the rocker arm 3 is provided with a hook head 3-1. The lever assembly 5 is provided on the outer circumference of the rotating frame. The lever assembly 5 consists of a lever support 5-1, a shaft 5-2, and a roller 5-3. The center of the lever support 5-1 is provided with a double-ear structure, and the roller 5-3 is movably connected to the double-ear structure via the shaft 5-2. The hook head 3-1 at the end of the rocker arm 3 has a semi-circular slot. When the rotation angle of the rotating frame reaches the limit position, the hook head 3-1 with the semi-circular slot structure is fully engaged with the roller 5-3. The tail end of the rocker arm 3 is provided with a cam structure. When the rotating frame exceeds the software limit position and approaches the electrical limit angle, the cam surface 3-2 begins to contact the limit switch 2. The limit switch base is connected to the base 1. As the frame rotates and the rocker arm rotates, the travel of the limit switch continuously decreases. When the rotating frame reaches the set electrical limit angle, the limit switch reaches its limit, triggering the limit switch to operate. This interrupts the electrical signal in the direction of the rotating motor's movement, preventing the frame from continuing to rotate forward. However, the reverse motion electrical signal is unrestricted, allowing the frame to move in the opposite direction. When the software limit is blocked, or due to overshoot or a limit switch malfunction, the rotating frame fails to stop and reaches its limit position, the hook part 3-1 of the rocker arm is completely locked by the lever assembly 5-3. At the same time, the deceleration assembly 4 also generates significant resistance, ensuring that the rotating frame stops moving.

[0026] A reset device is provided on the rocker arm 3; the reset device is a return spring 6, one end of the return spring 6 is connected to the outer wall of the rocker arm 3, and the other end is connected to the fixed frame located above the rocker arm 3, so as to ensure that the rocker arm 3 is in a fixed angle when it is not working.

[0027] A reduction gear assembly 4 is also provided on the fixed frame. When the rocker arm 3 rotates to the set software limit position, the side wall of the rocker arm 3 begins to contact the reduction gear assembly 4 and is resisted by the elastic force. When it rotates to the set limit position angle, the elastic force of the spring 4-3 approaches its maximum value, and the reduction lever 4-2 slides close to its limit position and is blocked by the mounting base 4-1. Figure 2 As shown, the deceleration assembly 4 includes a mounting base 4-1, a deceleration rod 4-2, and a pressure spring 4-3. The mounting base 4-1 is fixedly connected to the fixed frame and has a through hole. The deceleration rod 4-2 is slidably connected along the through hole, and its axis is perpendicular to the contact surface of the rocker arm 3. A pressure spring 4-3 is provided on the outer circumference of the deceleration rod 4-2, with one end contacting the end of the deceleration rod 4-2 and the other end contacting the surface of the mounting base 4-1. This mechanical structure further prevents electrical failure and effectively ensures the rotation of the frame.

[0028] Since the rotating frame can rotate in both directions, the line connecting the center point of the rotating frame and the rotation center point of the rocker arm 3 forms an axis of symmetry 9. The limit switch 2 and the deceleration assembly 4 are symmetrically arranged around the axis of symmetry 9. The hooks 3-1 are symmetrically arranged on both sides of the rocker arm 3; when the rotating frame rotates clockwise, the roller 5-3 engages with the upper hook 3-1; when the rotating frame rotates counterclockwise, the roller 5-3 engages with the lower hook 3-1. Example 2

[0029] like Figure 7 As shown, the deceleration assembly 4 includes a buffer tension spring 4-4; the rocker arm 3 has a double-layer sliding sleeve structure, the buffer tension spring 4-4 ​​is located in the inner cavity of the rocker arm 3, and its two ends are respectively positioned and connected to different sleeves.

[0030] like Figure 8 As shown, the reset device is a return spring 6. Two return springs 6 are symmetrically arranged at one end on the outer wall of the rocker arm 3, and the other end is symmetrically connected to the base 1. By simultaneously and symmetrically pulling the rocker arm 3 with the two return springs 6, the rocker arm 3 is ensured to be in its initial position when not in operation.

[0031] The rest of the structure is the same as in Example 1. Example 3

[0032] like Figure 9 and Figure 10As shown, the reset device is a torsion spring 7, with a limiting post 8 located at the center of its inner circumference. The rotation shaft of the rocker arm is fixedly mounted at the center of the base 1. The limiting post 8 is inserted into the rotation shaft. After the limiting post is fixed, one end of the torsion spring is fixed to the base, effectively making the torsion spring equivalent to a double torsion spring in both directions. Both ends of the torsion spring 7 are respectively engaged with the positioning holes on both sides of the rocker arm 3. The elastic torque of the torsion spring 7 keeps the rocker arm 3 in its initial position when not in operation. Similarly, the reset device of this application can be replaced by any elastically deformable structure to ensure that the rocker arm 3 is in its initial position when not in operation, as would be apparent to those skilled in the art.

[0033] The rest of the structure is the same as in Example 1.

[0034] The working process of the limiting device for the rotating gantry of the medical accelerator in this application is as follows: 1. The lever assembly 5 rotates with the rotating frame. When it reaches a certain angle, the roller of the lever assembly contacts the side wall of the rocker arm, and the rocker arm 3 rotates accordingly. 2. When the rotating frame reaches the set software limit angle, the software limit will stop the movement of the rotating frame. If the software limit is blocked, when the rotating frame reaches the set electrical limit angle, the curved surface of the cam structure 3-2 contacts the limit switch 2. The limit switch 2 will cut off the drive signal of the rotating frame motor in the direction of movement, and the rotating frame will stop moving. 3. If the software limit is blocked and the electrical limit also fails to function, the pressure spring of the deceleration component 4 will generate a large rebound force due to continuous pressure, which will slow down the movement speed of the rotating frame. 4. When the rotating frame reaches the set limit position angle, the reduction assembly 4 generates a large rebound force. At the same time, the hook 3-1 of the rocker arm 3 mounted on the fixed frame hooks the roller 5-3 of the lever assembly 5 mounted on the rotating frame. At this time, the torque borne by the rotating frame drive gear assembly exceeds the torque range of the torque limiter. Relative sliding occurs between the friction plate of the torque limiter and the gear, causing the power output shaft to spin freely and terminating the movement of the rotating frame. 5. If the clockwise rotation of the rotating frame is restricted by the limit switch, counterclockwise rotation is permitted. As the rotating frame rotates, the rocker arm returns to its initial state under the action of the reset device; the roller 5-3 of the lever assembly 3 disengages from the rocker arm 3; and the limit switch 2 also returns to its initial state.

Claims

1. A limiting device for a rotating gantry of a medical accelerator, characterized in that: It includes a base (1), a limit switch (2), a rocker arm (3), and a lever assembly (5); wherein the base (1) is set on a fixed frame, and the center of the base (1) is rotatably connected to one end of the rocker arm (3) through a rotating shaft, and the other end of the rocker arm (3) is provided with a hook (3-1); the lever assembly (5) is provided on the outer circumference of the rotating frame; when the rotating frame reaches the set limit angle, the hook (3-1) engages with the lever assembly (5); at the end where the rocker arm (3) is connected to the base (1), there is a cam structure (3-2), and at the point where the rocker arm (3) rotates to the electrical limit position, there is a limit switch (2) that contacts the cam structure (3-2), and the base of the limit switch (2) is connected to the base (1); a reset device is provided on the rocker arm (3).

2. The limiting device for the rotating gantry of a medical accelerator according to claim 1, characterized in that: When the rocker arm (3) is rotated to its limit position, the rocker arm (3) is stopped by the deceleration component (4).

3. The limiting device for the rotating gantry of a medical accelerator according to claim 2, characterized in that: The deceleration assembly (4) includes a mounting base (4-1), a deceleration rod (4-2), and a pressure spring (4-3); wherein the mounting base (4-1) is fixedly connected to the fixed frame, and a through hole is provided on the mounting base (4-1), the deceleration rod (4-2) is slidably connected along the through hole, and the axis of the deceleration rod (4-2) is perpendicular to the contact surface of the rocker arm (3); a pressure spring (4-3) is provided on the outer circumference of the deceleration rod (4-2), one end of the pressure spring (4-3) is in contact with the end of the deceleration rod (4-2), and the other end is in contact with the surface of the mounting base (4-1).

4. The limiting device for the rotating gantry of a medical accelerator according to claim 3, characterized in that: The deceleration assembly (4) includes a buffer tension spring (4-4); the rocker arm (3) is a double-layer sliding sleeve structure, the buffer tension spring (4-4) is located in the inner cavity of the rocker arm (3), and its two ends are respectively positioned and connected to different sleeves.

5. The limiting device for the rotating gantry of a medical accelerator according to claim 1, characterized in that: The lever assembly (5) consists of a lever bracket (5-1), a shaft (5-2), and a roller (5-3); the lever bracket (5-1) has a double ear structure at its center, and the roller (5-3) is movably connected to the double ear through the shaft (5-2); the hook (3-1) at the end of the rocker arm (3) has a semi-circular slot, which engages with the roller (5-3).

6. The limiting device for the rotating gantry of a medical accelerator according to claim 1, characterized in that: The reset device is a return spring (6), one end of which is connected to the outer wall of the rocker arm (3), and the other end is connected to the fixed frame located above the rocker arm (3).

7. The limiting device for the rotating gantry of a medical accelerator according to claim 1, characterized in that: The reset device consists of two return springs (6). One end of each return spring (6) is symmetrically arranged on the outer wall of the rocker arm (3), and the other end is symmetrically connected to the base (1).

8. The limiting device for the rotating gantry of a medical accelerator according to claim 1, characterized in that: The reset device is a torsion spring (7), and a limiting post (8) is provided at the middle of the inner circumference of the torsion spring (7); the rotation shaft of the rocker arm is fixedly set at the center of the base (1), and the limiting post (8) is inserted into the rotation shaft. After the middle limiting post is inserted, one end of the torsion spring is fixed on the base, and it is equivalent to two independent torsion springs. The two ends of the torsion spring (7) are respectively snapped into the positioning holes on both sides of the rocker arm (3).

9. The limiting device for the rotating gantry of a medical accelerator according to claim 2, characterized in that: The center point of the rotating frame and the center point of the rocker arm (3) form a symmetry axis (9), and the limit switch (2) and the deceleration assembly (4) are symmetrically arranged with the symmetry axis (9) as the center.

10. The limiting device for the rotating gantry of a medical accelerator according to claim 9, characterized in that: The hooks (3-1) are symmetrically arranged on both sides of the rocker arm (3); when the rotating frame rotates clockwise, the roller (5-3) engages with the upper hook (3-1); when the rotating frame rotates counterclockwise, the roller (5-3) engages with the lower hook (3-1).

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