阅读说明：本技术 重力落销式电子线放射治疗野挡铅螺丝的锁定装置 (Locking device of gravity pin-falling type electronic wire radiotherapy wild lead blocking screw ) 是由 方军 王跃珍 刘冬 顾飞英 张鹏 于 2020-07-21 设计创作，主要内容包括：本发明提供一种重力落销式电子线放射治疗野挡铅螺丝的锁定装置,由旋钮,销孔,压窗,螺丝,螺孔,锥孔,螺座,圆锥,下限圈,旋钮纹,偏心锁组件,销纹,销子和上限圈构成。本发明提出了一款可以重复使用的异形野成型装置,解决了对活动螺丝的状态的锁定,特别是用在电子线放射治疗中照射野的调节螺丝的状态锁定。本发明将丝进的位移用于力量的精确施加；圆锥体在重力的作用下可以自由滑动于各个锥孔之间(未锁定状态),采用了偏心圆柱体的的转动形成长短不一的力矩,来实现对销子整体的上下的制动。整个装置设计合理,制作简便,受力科学,开合方便简单,效果显著,具有使用价值。(The invention provides a locking device of a gravity pin-falling type electronic wire radiotherapy wild blocking lead screw, which consists of a knob, a pin hole, a pressing window, a screw hole, a taper hole, a screw seat, a taper, a lower limit ring, a knob pattern, an eccentric lock component, a pin pattern, a pin and an upper limit ring. The invention provides a special-shaped field forming device capable of being repeatedly used, which solves the problem of locking the state of a movable screw, in particular to the state of an adjusting screw used for the irradiation field in electronic ray radiotherapy. The invention uses the displacement of the thread feeding for the accurate application of force; the cone can freely slide among the taper holes under the action of gravity (unlocked state), and the rotation of the eccentric cylinder is adopted to form moments with different lengths, so that the up and down braking of the whole pin is realized. The whole device has the advantages of reasonable design, simple and convenient manufacture, scientific stress, convenient and simple opening and closing, obvious effect and use value.)

1. A locking device of a gravity pin-falling type electronic radiation therapy wild blocking lead screw is characterized by comprising a knob (1), a pin hole (2), a press window (3), a screw (4), a screw hole (5), a taper hole (6), a screw seat (7), a cone (8), a lower limit ring (9), knob threads (10), an eccentric lock assembly (11), pin threads (12), a pin (13) and an upper limit ring (14); a screw hole (5) is formed in the center of a square screw seat (7), the screw hole (5) penetrates through the whole layer of the screw seat (7), threads are distributed on the inner wall of the screw hole (5), a conical hole (6) is a hole formed by sinking the upper surface of the screw seat (7), the two ends of the conical hole (6) are circular arc-shaped, parallel lines are connected between the two ends of the conical hole (6), 24 conical holes (6) are uniformly distributed in a right circular ring shape by radiating outwards with the screw hole (5) as the center of the circle, each conical hole (6) is equidistant from left to right, the long axis of each conical hole (6) points to the center of the screw hole (5), the side wall of a cylindrical screw (4) is fully distributed with threads and is matched with the threads on the inner wall of the screw hole (5), the screw (4) freely rotates in the screw hole (5) through the threads, the lower end of the screw (4) is free, the upper end of the screw (4) is sleeved with a knob (1), the upper surface of the knob, the knob (1) is fixedly connected with the screw (4), a vertically penetrating hole is formed in the annular upper surface of the knob (1) and is a pin hole (2), the pin hole (2) penetrates through the whole layer of the knob (1) and is formed in a hole in the lower surface of the knob (1), the middle part of the cone (6) is opposite to the right lower side of the pin hole (2), the upper middle position and the lower middle position of the side wall of the knob (1) are inwards sunken to form a rectangular press window (3), the press window (3) extends inwards and is communicated with the pin hole (2), knob grains (10) are fully distributed on the side surface of the knob (1), a cylindrical pin (13) rotates and moves up and down in the pin hole (2), the upper end of the pin (13) is sleeved with an upper limit ring (14), the upper surface of the upper limit ring (14) is flushed, the diameter of the upper limit ring (14) is larger than that of the pin hole (2), the lower end of the pin (13) is sleeved with a lower limit ring (9, the diameter of the lower limiting ring (9) is larger than the short diameter of the taper hole (6), the cone (8) of the cone is connected with the bottom surface of the lower end of the pin (13), the diameter of the circular surface of the cone (8) is consistent with that of the pin (13), the diameter of the circular surface of the cone (8) is larger than the shortest diameter of the taper hole (6), the tip end of the cone (8) falls into the taper hole (6), the pin (13) is fully distributed with pin threads (13), and the middle parts of the outer edges of two sides of the press window (3) are connected with an eccentric lock assembly (11).

2. The locking device of a gravity pin type electron beam radiotherapy wild blocking lead screw according to claim 1, wherein the eccentric lock assembly (11) is composed of a bean sprout base A (15), a bean sprout base B (16), a pressing flap (17), an eccentric shaft (18), a shaft hole B (19), an eccentric circle (20), a circular tooth (21) and a shaft hole A (22), the eccentric circle (20) is a regular cylinder with two regular circular sides, the eccentric shaft (18) is respectively emitted from the left and right sides of the eccentric radius 1/2 of the two regular circular surfaces of the eccentric circle (20), the shaft hole A (22) is arranged on the side of the bean sprout base A (15), the shaft hole B (19) is arranged on the side of the bean sprout base B (16), the bean sprout base A (15) and the bean sprout base B (16) are in a pair structure with the same size and are parallel and opposite, wherein the shaft hole B (19) and the shaft hole A (22) are opposite, two ends of an eccentric shaft (18) freely rotate in two holes of a shaft hole B (19) and a shaft hole A (22), an eccentric circle (20) rotates between a bean sprout seat A (15) and a bean sprout seat B (16), a circular arc-shaped pressing flap (17) is formed by a tangent line on the cylinder side surface of the eccentric circle (20) right behind the shaft root of the eccentric shaft (18), when the shaft root of the eccentric shaft (18) and the root of the pressing flap (17) are in a horizontal state, a drooping line at the tail end of the pressing flap (17) just passes through the center of the eccentric shaft (18), the left side surface and the right side surface of the pressing flap (17) are flush with the left side surface and the right side surface of the eccentric circle (20), wherein the cylinder side surface of the eccentric circle (20) is fully distributed with round teeth (21), the back surfaces of the bean sprout seat A (15) and the bean sprout seat B (16) are respectively connected with the middle parts of the outer edges of two sides of the pressing window (3), wherein the inner side surfaces of the bean sprout seat A, the eccentric circle (20) freely enters and exits the press window (3), and the round teeth (21) contact the pin patterns (12).

Technical Field

The invention belongs to accessories of radiotherapy auxiliary appliances, and relates to a locking device of a gravity pin type electronic ray radiotherapy wild lead blocking screw, which is suitable for locking the threading degree of the screw.

Background

Electron beam irradiation field: the term "radiotherapy-related term" means a range of regions irradiated with radiation. The field created by radiotherapy using electron beams is called the electron beam irradiation field. Due to the different tumor infiltration range, the irradiation field is mostly irregular. In the past, the irradiation field in the electronic wire therapy is formed by using a manual splicing lead blocking method and pouring individualized lead blocking. The former has the defects of slipping, lack of precision, lack of supervision and the like, and the latter has the defects of lead poisoning, environmental pollution, complex process and the like. A problem is currently encountered clinically: the screw thread engagement is non-parallel and the possibility of screw loosening exists, so how to ensure the locking of the screw feeding or screw withdrawing degree and adjust at any time. The most common locking device on the market is locking a fastening screw, and the locking device for adjusting the screw threading degree is less common.

Disclosure of Invention

The invention aims to provide a locking device of a gravity pin type electronic radiation therapy field lead blocking screw, which is a gravity pin type screw feeding and locking device for an electronic radiation therapy field forming device. The device is composed of a knob 1, a pin hole 2, a press window 3, a screw 4, a screw hole 5, a taper hole 6, a screw seat 7, a cone 8, a lower limit ring 9, knob threads 10, an eccentric lock assembly 11, pin threads 12, a pin 13 and an upper limit ring 14. The center of the square screw seat 7 is provided with a screw hole 5, the screw hole 5 penetrates through the whole layer of the screw seat 7, and the inner wall of the screw hole 5 is fully distributed with screw threads. The taper hole 6 is a hole which is approximately rectangular and is formed by sinking the upper surface of the screw seat 7, and the two ends of the taper hole 6 are circular arcs and the middle is connected with a parallel line. The 24 conical holes 6 are uniformly distributed in a regular circle shape (each hole is equidistant from left to right) by radiating outwards by taking the (center of the) screw hole 5 as a circle center. The long axis (i.e. the connecting line of the two ends) of each conical hole 6 points to the center of the screw hole 5. The side wall of the cylindrical screw 4 is fully provided with threads which are matched with the threads on the inner wall of the screw hole 5, and the screw 4 can freely rotate in the screw hole 5 through the threads. The lower extreme of screw 4 is free, and knob 1 and upper surface flush are cup jointed to the screw 4 upper end. The knob 1 is a ring column structure, the diameter of the knob 1 is larger than that of the screw 4, and the knob 1 is fixedly connected with the screw 4. The upper surface of the ring shape of the knob 1 is provided with a vertical through hole pin hole 2, and the pin hole 2 penetrates through the whole layer of the knob 1 and is provided with a hole on the lower surface of the knob 1. The middle part of the taper hole 6 is opposite to the right lower part of the pin hole 2. The middle position about the lateral wall of knob 1 is inwards sunken to form rectangular pressure window 3, presses window 3 to extend inwards and link up with pinhole 2. The side surface of the knob 1 is full of knob patterns 10. The cylindrical pin 13 can rotate and move up and down in the pin hole 2, the upper end of the pin 13 is sleeved with the upper limit ring 14, the upper surface of the pin is flush, and the diameter of the upper limit ring 14 is larger than that of the pin hole 2. The lower end of the pin 13 is sleeved with the lower limit ring 9, the lower surface of the pin is flush, and the diameter of the lower limit ring 9 is larger than that of the pin hole 2. The diameter of the lower limit ring 9 is larger than the minor diameter of the taper hole 6. The cone 8 of the cone is connected with the bottom surface of the lower end of the pin 13, and the diameter of the circular surface of the cone 8 is consistent with that of the pin 13. The diameter of the circular face of the cone 8 is larger than the shortest diameter of the conical hole 6 and the tip of the cone 8 can fall into the conical hole 6. The pin 13 is full of pin lines 13. The middle parts of the outer edges of the two sides of the press window 3 are connected with eccentric lock assemblies 11, and the specific connection mode is described later.

The eccentric lock assembly 11 is composed of a bean sprout seat A15, a bean sprout seat B16, a pressing flap 17, an eccentric shaft 18, a shaft hole B19, an eccentric circle 20, a circular tooth 21 and a shaft hole A22. The eccentric circle 20 is a right cylinder, and the side surfaces are two right circular surfaces. Eccentric shafts 18 are projected to the left and right sides at the radius of eccentricity 1/2 of the two perfect circular surfaces of the eccentric circle 20. The bean sprout seat A15 is provided with a through hole shaft hole A22 on the side surface, the bean sprout seat B16 is provided with a through hole shaft hole B19 on the side surface, and the bean sprout seat A15 and the bean sprout seat B16 are in a pair structure with the same size and are opposite in parallel. Wherein the axle hole B19 and the axle hole A22 are opposite. Both ends of the eccentric shaft 18 freely rotate in both the shaft hole B19 and the shaft hole a22, i.e., the eccentric circle 20 rotates between the bean sprout seat a15 and the bean sprout seat B16. The tangent line on the cylinder side of the eccentric circle 20 right behind the shaft root of the eccentric shaft 18 sends out a circular arc-shaped pressing flap 17. When both the root of the eccentric shaft 18 and the root of the pressing lobe 17 are in a horizontal state, the downward hanging line of the end of the pressing lobe 17 passes through the center of the eccentric shaft 18. The left and right side surfaces of the pressing piece 17 are flush with the left and right perfect circular side surfaces of the eccentric circle 20. The side of the eccentric circle 20 is full of round teeth 21. The back surfaces of the bean sprout seats A15 and B16 are respectively connected to the middle parts of the two side outer edges of the press window 3. Wherein the inner side surfaces of the bean sprout seats a15 and B16 are flush with the edge of the press window 3. I.e. the eccentric circle 20 can freely enter and exit the press window 3, and the circular teeth 21 contact the thread 12.

The invention provides a special-shaped field forming device capable of being repeatedly used based on a plurality of defects in two methods mentioned in the background technology. The device of the invention aims to solve the problem of locking the state of a movable screw, in particular to a state locking device of an adjusting screw for an irradiation field in electron beam radiotherapy. The lead sheet used for special-shaped field forming in the device needs to move and stay, but cannot be influenced by the outside (gravity, mistaken collision and other factors), namely, the lead sheet device needs to apply appropriate force, and the lead sheet device is applied by adopting a screw feeding principle capable of being accurately controlled. The invention uses the displacement of the thread feeding for the accurate application of force; the cone can freely slide between the taper holes under the action of gravity (unlocked state). The rotation of the eccentric cylinder is adopted to form moments with different lengths, so that the up and down braking of the whole pin is realized. The whole device has the advantages of reasonable design, simple and convenient manufacture, scientific stress, convenient and simple opening and closing, obvious effect and use value.

Drawings

FIG. 1 is a schematic diagram of the present invention.

FIG. 2 is a schematic bottom view of the present invention.

Fig. 3 is an exploded view of the "eccentric lock assembly 11" of the present invention and the knob 1.

Fig. 4 is a front view of the "cam lock assembly 11" of the present invention.

Fig. 5 is a schematic side view of the assembly "cam lock assembly 11" of the present invention.

Fig. 6 is a front side view of the assembly "cam lock assembly 11" of the present invention.

Fig. 7 is a combination view of both the bean sprout seats a15 and B16 of the present invention with the knob 1.

Fig. 8 is a schematic view of the structure of the pressing flap 17 at the lower side (unlocked state).

Fig. 9 is a schematic structural view of the pressing flap 17 at the upper side (locked state).

Fig. 10 is a moment diagram of the pin 13 and the eccentric circle 20 according to the present invention.

Fig. 11 is a force analysis diagram of the cone 8 and the tapered hole 6 in the present invention.

Detailed Description

The invention is further explained by the accompanying drawings and examples.