Gravity balance system and mobile radioactive ray device

Abstract

The embodiment of the invention discloses a gravity balance system and a mobile radioactive ray device, the gravity balance system comprises a cylinder, a variable-diameter wheel, an elastic piece, a lifting assembly and a first cable, the variable-diameter wheel is arranged in a containing cavity of the cylinder and is hinged to the cylinder; the elastic piece is arranged in the containing cavity of the cylinder, and the first end of the elastic piece is connected with the cylinder; the lifting assembly is slidably arranged on the cylinder in the vertical direction. The third end of the first cable is connected with the second end of the elastic piece, the fourth end of the first cable is connected with the lifting assembly, and the first cable is wound around the variable-diameter wheel; the cylinder is provided with a first wall face, a second wall face, a third wall face and a fourth wall face, the first wall face and the second wall face are oppositely arranged, the third wall face and the fourth wall face are oppositely arranged, the first wall face, the third wall face, the second wall face and the fourth wall face are sequentially connected and define a containing cavity, and included angles are formed between the axis of the variable-diameter wheel and the first wall face and between the axis of the variable-diameter wheel and the third wall face. The variable-diameter wheel is arranged in a deflection mode in the horizontal direction, so that the variable-diameter wheel can utilize the diagonal space of the cylinder, and the size of the cylinder is reduced.

Description

Technical Field

[0001] The present application relates to the field of balancing mechanisms, and in particular to a gravity balancing system and a mobile radiation device. Background Art

[0002] Medical mobile DR equipment is widely used in hospitals of all levels due to its small size and flexibility. Such equipment usually adopts a variable diameter wheel balancing system. The spring force provided by the balance spring is transformed by the variable diameter wheel to balance the load gravity, so that the operator can easily lift and move the load device up and down.

[0003] In the related art, the diameter of the variable diameter wheel at the largest point is relatively large, thus occupying relatively more space of the outer cylinder. Summary of the invention

[0004] The embodiments of the present application provide a gravity balance system and a mobile radiation device, which save space in the outer cylinder by tilting the variable diameter wheel to utilize the diagonal length of the outer cylinder.

[0005] In a first aspect, an embodiment of the present application provides a gravity balancing system, which includes a cylinder, a variable diameter wheel, an elastic member, a lifting assembly and a first cable, wherein the cylinder has a accommodating cavity; the variable diameter wheel is arranged in the accommodating cavity of the cylinder and is hinged to the cylinder; the elastic member is arranged in the accommodating cavity of the cylinder, the elastic member has a first end and a second end, and the first end of the elastic member is connected to the cylinder; the lifting assembly is slidably arranged on the cylinder along the vertical direction; the first cable has a third end and a fourth end, the third end of the first cable is connected to the second end of the elastic member, the fourth end of the first cable is connected to the lifting assembly, and the first cable is wound around the variable diameter wheel; wherein the cylinder has a first wall surface and a second wall surface arranged oppositely, and a third wall surface and a fourth wall surface arranged oppositely, the first wall surface, the third wall surface, the second wall surface and the fourth wall surface are sequentially connected and enclosed to form the accommodating cavity, and the axis of the variable diameter wheel is arranged at a uniform angle to the first wall surface and the third wall surface.

[0006] In some exemplary embodiments, the angle between the axis of the variable diameter wheel and the first wall surface is greater than zero degree and less than or equal to 45 degrees.

[0007] In some exemplary embodiments, the axis of the variable diameter wheel is perpendicular to one of the diagonals of the cylinder.

[0008] In some exemplary embodiments, the variable diameter wheel has a first variable diameter section and a second variable diameter section, the first variable diameter section and the second variable diameter section have a smooth transition, the first cable is wound around the first variable diameter section and the second variable diameter section, the elastic member applies force to the first variable diameter section, and the lifting assembly applies force to the second variable diameter section.

[0009] In some exemplary embodiments, in the axial direction of the reducing wheel, the diameter of an end of the first reducing section close to the second reducing section is greater than the diameter of an end of the first reducing section away from the second reducing section; the diameter of an end of the second reducing section close to the first reducing section is greater than the diameter of an end of the second reducing section away from the first reducing section.

[0010] In some exemplary embodiments, the included angle between the first wall surface and the third wall surface is α, the included angle between the first wall surface and the fourth wall surface is β, and the taper angle of the second diameter-changing section is α or β.

[0011] In some exemplary embodiments, the first wall surface is perpendicular to the third wall surface, the second diameter-changing section faces the first wall surface and the third wall surface, and the cone angle of the second diameter-changing section is 90 degrees.

[0012] In some exemplary embodiments, the gravity balancing system also includes a pulley assembly and a second cable, the pulley assembly is arranged in the accommodating cavity of the column, and the pulley assembly includes: a fixed pulley, coaxially arranged with the variable diameter wheel; a movable pulley, connected to the second end of the elastic member; wherein the second cable has a fifth end and a sixth end, the fifth end of the second cable is connected to the column, the sixth end of the second cable is connected to the third end of the first cable, and the second cable is wrapped around the fixed pulley and the movable pulley.

[0013] In some exemplary embodiments, the column includes a first section and a second section connected to the first section, the variable diameter wheel is arranged in the first section, the elastic member is arranged in the second section, and the cross-sectional area of ​​the first section in a direction perpendicular to the length of the column is greater than the cross-sectional area of ​​the second section in a direction perpendicular to the length of the column.

[0014] In some exemplary embodiments, a gravity balance system and a radiation module are included, and the radiation module is connected to the lifting assembly.

[0015] Beneficial effect: In this embodiment, the variable diameter wheel is arranged to be deflected in the horizontal direction so that the variable diameter wheel can utilize the diagonal space of the column. When the size of the variable diameter wheel is constant, the size of the column can be reduced, thereby saving manufacturing materials, reducing the weight of the column, reducing the volume of the column, and improving the visual effect of the column. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of a mobile radiation device in one embodiment of the present application;

[0018] Figure 2 This is a structural schematic diagram of a gravity balance system in one embodiment of the present application;

[0019] Figure 3 A partially exploded structural diagram of a gravity balance system in one embodiment of the present application;

[0020] Figure 4 Schematic diagram of arrangement of the variable diameter wheels in other embodiments;

[0021] Figure 5 A partial structural schematic diagram of a gravity balance system in one embodiment of the present application;

[0022] Figure 6 This is a schematic diagram of the structure of a variable diameter wheel in an embodiment of the present application;

[0023] Figure 7 This is a schematic diagram of the structure in which the variable diameter wheel and the fixed pulley are integrated in one embodiment of the present application;

[0024] Figure 8 This is a schematic diagram of the structure in which the variable diameter wheel and the fixed pulley are integrated in another embodiment of the present application;

[0025] Fig. 9 It is a schematic diagram of a partial decomposition structure of a gravity balance system in another embodiment of the present application.

[0026] Explanation of the reference numerals: 100, gravity balance system; 110, column; 111, first wall; 112, second wall; 113, third wall; 114, fourth wall; 115, first section; 116, second section; 120, reducing wheel; 121, first reducing section; 122, second reducing section; 130, elastic member; 131, first end; 132, second end; 140, lifting assembly; 150, first cable; 151, third end; 152, fourth end; 160, pulley assembly; 161, fixed pulley; 162, movable pulley; 170, second cable; 171, fifth end; 172, sixth end; 180, base; AA, axis; 200, mobile radiation device; 210, radiation module. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0032] like Figure 1As shown, a first aspect of an embodiment of the present application provides a mobile radiation device 200, which can be exemplarily a mobile X-ray device (mobile X-ray equipment), a mobile α-ray device, a mobile β-ray device, a mobile γ-ray device, a mobile proton heavy particle accelerator, etc. The mobile radiation device 200 includes a gravity balance system 100 and a radiation module 210. The gravity balance system 100 is used to balance the gravity of the radiation module 210, so that the radiation module 210 can move up and down in the vertical direction and can be configured to hover at any position, so that the operator can adjust the height of the radiation module 210, so that the mobile radiation device 200 can image different parts of different patients.

[0033] It is understandable that the gravity balance system 100 can also be applied to other functional modules, so that other functional modules can move up and down and hover to adjust the height of the functional modules. For example, the functional module can be a television, so that the height of the television can be adjusted. The following is an example of the gravity balance system 100 being applied to the radiation module 210.

[0034] like Figure 1-3 As shown, a second aspect of an embodiment of the present application provides a gravity balancing system 100 , which includes a column 110 , a variable diameter wheel 120 , an elastic member 130 , a lifting assembly 140 and a first cable 150 .

[0035] The cylinder 110 is a hollow structure. For example, the cylinder 110 has a receiving cavity. The variable diameter wheel 120, the elastic member 130 and the first cable 150 can be arranged in the receiving cavity of the cylinder 110. The cylinder 110 can protect the variable diameter wheel 120, the elastic member 130 and the first cable 150 to prevent external objects from affecting the operation of the variable diameter wheel 120, the elastic member 130 and the first cable 150. The cylinder 110 has a first wall 111 and a second wall 112 that are arranged opposite to each other, and a third wall 113 and a fourth wall 114 that are arranged opposite to each other. The first wall 111, the third wall 113, the second wall 112 and the fourth wall 114 are sequentially connected and enclosed to form a receiving cavity. The first wall 111, the third wall 113, the second wall 112 and the fourth wall 114 can be integrally formed or assembled, which is not limited here. The cross-sectional shape of the column 110 perpendicular to the length direction of the column 110 can be roughly square, rectangular, rhombus, etc. It is understandable that in actual products, due to design needs, or the need to be compatible with other parts, the cross-sectional shape of the column 110 perpendicular to the length direction of the column 110 may not be a standard quadrilateral, but only roughly a quadrilateral. In this case, the column 110 is still within the protection scope of the present application. For example, one or more of the four corners of the column 110 are provided with chamfers, or one side of the column 110 protrudes slightly outward, and the cross-sectional shape of the column 110 can still be considered to be a rectangle. The material of the column 110 can be an alloy, so that the column 110 has a higher strength, and the texture of the column 110 is relatively light.

[0036] The variable diameter wheel 120 is hinged to the cylinder 110, that is, the variable diameter wheel 120 is rotatable relative to the cylinder 110. Exemplarily, a connecting bracket is provided in the cylinder 110, a fixed shaft is provided on the connecting bracket, and the variable diameter wheel 120 is rotatably provided on the fixed shaft. Optionally, a bearing is provided between the variable diameter wheel 120 and the fixed shaft, so that the variable diameter wheel 120 can rotate relatively smoothly and the friction between the variable diameter wheel 120 and the fixed shaft can be reduced.

[0037] The elastic member 130 is used to provide a pulling force to balance the gravity of the radiation module 210, so that the radiation module 210 is suspended. The elastic member 130 has a first end 131 and a second end 132, and the first end 131 of the elastic member 130 is connected to the cylinder 110. The elastic member 130 can be a coil spring, which can effectively store and release energy with less energy loss, and has a compact structure, a relatively simple manufacturing process, and a low cost. The diameter of the coil spring is set as large as possible, so that the deformation capacity of the coil spring is better. In some alternative embodiments, the elastic member 130 can also be other elastic components; for example, the elastic member 130 can also be a gas spring, a compression spring, a coil spring, etc.

[0038] The lifting assembly 140 is slidably disposed on the column 110 in the vertical direction. The lifting assembly 140 is used to connect with the radiation module 210, and the radiation module 210 moves synchronously with the lifting assembly 140. By lifting the radiation module 210, not only can the operator aim at different parts of different patients, but also the operator has a better field of view during the moving process of the device to avoid collision during the moving process. The lifting assembly 140 and the radiation module 210 can be fixedly connected by bolts, welding, gluing, clamping, etc.

[0039] Optionally, a slide rail is provided on the column 110, and a pulley is provided on the lifting assembly 140, and the pulley is slidably provided on the slide rail, so that the lifting assembly 140 is slidably provided on the column 110. The pulley cooperates with the slide rail to reduce the friction between the lifting assembly 140 and the column 110, so that the column 110 slides more smoothly, and the user is more relaxed when adjusting. In addition, the slide rail can limit the pulley so that the lifting assembly 140 cannot move in directions other than the sliding direction.

[0040] The first cable 150 has a third end 151 and a fourth end 152. The third end 151 of the first cable 150 is connected to the second end 132 of the elastic member 130. The fourth end 152 of the first cable 150 is connected to the lifting assembly 140, and the first cable 150 is wound around the variable diameter wheel 120. The elastic member 130 applies a force to the variable diameter wheel 120 through the third end 151 of the first cable 150, and the lifting assembly 140 applies a force to the variable diameter wheel 120 through the fourth end 152 of the first cable 150. The force applied by the elastic member 130 to the variable diameter wheel 120 is balanced with the force applied by the lifting assembly 140 to the variable diameter wheel 120, so that the lifting assembly 140 can maintain a stationary state. The first cable 150 is an inextensible rope. Specifically, the first cable 150 can be made of a high-strength material (such as steel wire, etc.), and the first cable 150 can be exemplarily a steel wire rope, so that it has a higher strength and is not easy to be damaged.

[0041] It is understandable that when the user applies a force to the lifting assembly 140, the lifting assembly 140 will move, and the lifting assembly 140 will drive the variable diameter wheel 120 to rotate when moving, and the rotation of the variable diameter wheel 120 will drive the elastic force of the elastic member 130 to change. At this time, it is only necessary to make the change in the elastic potential energy of the elastic member 130 the same as the change in the gravitational potential energy of the lifting assembly 140 and the radiation module 210. For example, when the lifting assembly 140 and the radiation module 210 rise, the gravitational potential energy of the lifting assembly 140 and the radiation module 210 increases, and at this time, the elastic member 130 releases the deformation amount, and the elastic potential energy of the elastic member 130 decreases. When the lifting assembly 140 and the radiation module 210 descend, the gravitational potential energy of the lifting assembly 140 and the radiation module 210 decreases, and at this time, the elastic member 130 is stretched (or compressed) to have a deformation amount, and the elastic potential energy of the elastic member 130 increases.

[0042] Exemplarily, the elastic member 130 applies force to the variable wheel 120 through the third end 151 of the first cable 150, and the lifting assembly 140 applies force to the variable wheel 120 through the fourth end 152 of the first cable 150. The torque of the elastic member 130 on the variable wheel 120 and the torque of the lifting assembly 140 on the variable wheel 120 are substantially the same and opposite in direction, so that the variable wheel 120 can remain stationary when there is no external force, and the torque is equal to the applied force multiplied by the lever arm. When the lifting assembly 140 moves, the elastic force of the elastic member 130 will change, that is, the force exerted by the elastic member 130 on the variable wheel 120 will change, while the force exerted by the lifting assembly 140 on the elastic member 130 will not change. Therefore, in order to keep the lifting assembly 140 and the elastic member 130 balanced, the length of the lever arm of the elastic member 130 on the variable wheel 120 or the length of the lever arm of the lifting assembly 140 on the variable wheel 120 can be changed, so that the torque of the elastic member 130 on the variable wheel 120 is substantially the same as the torque of the lifting assembly 140 on the variable wheel 120 and the direction is opposite. The length of the lever arm of the elastic member 130 on the variable wheel 120 and the length of the lever arm of the lifting assembly 140 on the variable wheel 120 are related to the diameter of the variable wheel 120. By optimizing the diameters of different parts of the variable wheel 120, the above-mentioned hovering effect can be achieved.

[0043] like Figure 4 As shown, in the related art, the variable diameter wheel 120 usually includes a cylindrical section and a variable diameter section. The variable diameter section is connected to the balance spring by a steel wire rope, and the cylindrical section is connected to the load device by a steel wire rope. The axis of the cylindrical section is parallel to the front surface of the fixed column. Since the diameter of the cylindrical section is larger and occupies more space, the inner cavity size (dimension in the thickness direction) of the fixed column adapted to the variable diameter wheel 120 is larger, the aluminum alloy material consumption is large, the production cost is high, and at the same time, the size control of the equipment is affected, and the visual effect of the appearance of the fixed column is poor.

[0044] In this embodiment, the axis AA of the variable diameter wheel 120 is arranged at a uniform angle to the first wall 111 and the third wall 113. It can be understood that in a rectangle, the length of the diagonal is often greater than the length of the side. In this embodiment, the variable diameter wheel 120 is deflected in the horizontal direction so that the variable diameter wheel 120 can utilize the diagonal space of the column 110. When the size of the variable diameter wheel 120 is constant, the size of the column 110 can be reduced, thereby saving manufacturing materials, reducing the weight of the column 110, reducing the volume of the column 110, and improving the visual effect of the column 110.

[0045] like Figure 5 As shown, in some embodiments, the deflection angle of the variable diameter wheel 120 can be set according to actual conditions, which is not limited here. Exemplarily, the angle between the axis AA of the variable diameter wheel 120 and the first wall 111 is greater than zero degrees and less than or equal to 45 degrees, so as to meet most scene requirements. Optionally, when the column 110 is a square column, the angle between the axis AA of the variable diameter wheel 120 and the first wall 111 is 45 degrees, so that the variable diameter wheel 120 can maximize the use of the diagonal space of the column 110.

[0046] like Figure 5 As shown, in some embodiments, the axis AA of the variable diameter wheel 120 is perpendicular to one of the diagonals of the column 110, that is, the variable diameter wheel 120 is arranged along the diagonal direction of the column 110, so that the variable diameter wheel 120 can make full use of the diagonal size of the column 110 and minimize the size of the column 110.

[0047] like Figure 6As shown, in some embodiments, the reducing wheel 120 has a first reducing section 121 and a second reducing section 122, the first reducing section 121 and the second reducing section 122 have a smooth transition, the first cable 150 is wound around the first reducing section 121 and the second reducing section 122, the elastic member 130 applies force to the first reducing section 121, and the lifting assembly 140 applies force to the second reducing section 122. The first reducing section 121 may be an equal conical helix, and the second reducing section 122 may be an equal pitch conical helix. Exemplarily, the elastic member 130 applies a force to the first variable diameter section 121, and the lifting assembly 140 applies a force to the second variable diameter section 122. When the variable diameter wheel 120 rotates, the winding position of the first cable 150 on the first variable diameter section 121 and the second variable diameter section 122 changes, that is, the force arm of the elastic member 130 for the first variable diameter section 121 and the force arm of the lifting assembly 140 for the second variable diameter section 122 change. At this time, it is necessary to make the change amount of the second variable diameter section 122 match the change amount of the first variable diameter section 121 and the elastic force of the elastic member 130, so that the torque of the elastic member 130 on the variable diameter wheel 120 is roughly the same as the torque of the lifting assembly 140 on the variable diameter wheel 120. For example, when the lifting assembly 140 descends, the variable diameter wheel 120 rotates, the elastic force of the elastic member 130 increases, and the winding diameter of the first cable 150 on the first variable diameter section 121 increases, then the torque of the elastic member 130 on the variable diameter wheel 120 increases, and at this time, the winding diameter of the first cable 150 on the second variable diameter section 122 needs to increase to a greater extent, so as to ensure the balance between the elastic member 130 and the lifting assembly 140. The variable diameter wheel 120 of the embodiment of the present application includes two variable diameter sections, and the variable diameter section occupies less space than the cylindrical section, thereby saving space and reducing the size of the column 110.

[0048] like Figure 6 As shown, in some embodiments, in the axial direction of the variable diameter wheel 120, the diameter of the end of the first variable diameter section 121 close to the second variable diameter section 122 is greater than the diameter of the end of the first variable diameter section 121 away from the second variable diameter section 122; the diameter of the end of the second variable diameter section 122 close to the first variable diameter section 121 is greater than the diameter of the end of the second variable diameter section 122 away from the first variable diameter section 121. That is, in the direction from the first variable diameter section 121 to the second variable diameter section 122, the diameter of the first variable diameter section 121 becomes larger and the diameter of the second variable diameter section 122 becomes smaller. In this embodiment, the diameter of the variable diameter wheel 120 at the middle position is relatively large, and the diameter at the two end positions is relatively small, so as to adapt to the diagonal arrangement and save space.

[0049] In some embodiments, the angle between the first wall 111 and the third wall 113 is α, the angle between the first wall 111 and the fourth wall 114 is β, and the cone angle of the second diameter-reducing section 122 is α or β, and α and β can be the same or different. When the cross-section of the cylinder 110 is a rectangular shape, α and β are the same angle and are both 90 degrees. When the cross-section of the cylinder 110 is a rhombus, α and β are complementary angles. By matching the cone angle of the second diameter-reducing section 122 with the inner angle of the cylinder 110, the second diameter-reducing section 122 can be closer to the inner wall of the cylinder 110, so that the space of the accommodating cavity of the cylinder 110 can be fully utilized, making the gravity balance system 100 more compact.

[0050] In some embodiments, the first wall 111 and the third wall 113 are vertically arranged, the second diameter-changing section 122 faces the first wall 111 and the third wall 113, and the cone angle of the second diameter-changing section 122 is 90 degrees, so as to fully utilize the space formed by the first wall 111 and the third wall 113, so that the layout of the diameter-changing wheel 120 is more compact.

[0051] like Figure 1 and Figure 3 As shown, in some embodiments, the gravity balance system 100 further includes a pulley assembly 160 and a second cable 170. The pulley assembly 160 is disposed in the accommodating cavity of the cylinder 110. The pulley assembly 160 includes a fixed pulley 161 and a movable pulley 162. The fixed pulley 161 is connected to the cylinder 110, and the movable pulley 162 is connected to the second end 132 of the elastic member 130. When the elastic member 130 is extended or retracted, the movable pulley 162 moves up and down synchronously. The second cable 170 has a fifth end 171 and a sixth end 172. The fifth end 171 of the second cable 170 is connected to the cylinder 110, and the sixth end 172 of the second cable 170 is connected to the third end 151 of the first cable 150. The second cable 170 is wound around the fixed pulley 161 and the movable pulley 162. The first cable 150 and the second cable 170 can be arranged in one piece or separately. The second cable 170 is an inextensible rope. Specifically, the second cable 170 may be made of a high-strength material (eg, steel wire, etc.), and the second cable 170 may be a steel wire rope, which has high strength and is not easily damaged.

[0052] The fixed pulley 161 can change the force direction, and the movable pulley 162 can reduce the elongation of the elastic member 130. When the number of the movable pulley 162 is one, the second cable 170 is pulled, and the upward displacement of the movable pulley 162 is one-half of the pulling amount of the second cable 170, that is, the pulley assembly 160 can reduce the elongation of the elastic member 130, and the space reserved for the cylinder 110 can be relatively small, thereby saving space in the height direction of the cylinder 110. The number of the fixed pulley 161 and the movable pulley 162 can be one or more, and it is not limited here. The more the number of movable pulleys 162, the less the elongation of the elastic member 130.

[0053] like Figure 7-8 As shown, optionally, the fixed pulley 161 is coaxially arranged with the diameter-changing wheel 120 , so that the layout is more compact and the space of the cylinder 110 is fully utilized.

[0054] like Fig. 9 As shown, in some embodiments, the column 110 includes a first section 115 and a second section 116 connected to the first section 115, the variable diameter wheel 120 is disposed in the first section 115, the elastic member 130 is disposed in the second section 116, and the cross-sectional area of ​​the first section 115 in the direction perpendicular to the length of the column 110 is greater than the cross-sectional area of ​​the second section 116 in the direction perpendicular to the length of the column 110. That is, in the first section 115, since the variable diameter wheel 120 needs to be disposed, the size of the first section 115 can be slightly larger, and in the second section 116, since the variable diameter wheel 120 does not need to be disposed, the size of the second section 116 can be slightly smaller, so that the overall size of the column 110 can be reduced to reduce space occupation and save costs.

[0055] like Fig. 9 As shown, in some embodiments, the gravity balance system 100 also includes a base 180, and the cylinder 110 is arranged on the base 180. The base 180 can rotate, thereby driving the cylinder 110 to rotate, so that the cylinder 110 can rotate around its own vertical rotation axis. For example, the base 180 can be rotatably connected by a bearing, a turntable and other mechanisms. Optionally, the cylinder 110 can rotate around its own vertical rotation axis at any reasonable angle. For example, the cylinder 110 can rotate around a certain axis AA of itself by 15°, 30°, 45°, 60°, 75°, 90°, 180°, 270° and other angles to meet different usage requirements.

[0056] In some embodiments, a safety locking mechanism may be provided between the column 110 and the lifting assembly 140 to prevent the lifting assembly 140 from falling when the first cable 150 breaks. Optionally, a limiting portion is provided on the column 110, and a matching portion is provided on the lifting assembly 140. The limiting portion and the matching portion can be limitedly matched to fix the lifting assembly 140 relative to the column 110 to prevent the lifting assembly 140 from moving up and down due to accidents.

[0057] For example, the limiting portion may be a limiting groove, and the matching portion may be a locking rod, which may be inserted into the limiting groove to achieve limiting. Alternatively, the limiting portion and the matching portion may be an electrically controlled magnetic attraction structure (such as an electromagnet), and the magnetic attraction end and the magnet end of the electrically controlled magnetic attraction structure may be installed on the column 110 and the lifting assembly 140, respectively. When locking is required, the lifting assembly 140 may be attracted to the column 110 to achieve locking. In some other embodiments, the safety locking mechanism may also be provided on the variable diameter wheel 120 or the pulley assembly 160.

[0058] In some embodiments, the gravity balance system 100 may further include a driving member, which can drive the lifting assembly 140 to lift electrically, thereby eliminating the need for manual adjustment, and the adjustment of the driving member is more precise. The driving member may be a variable frequency motor, a servo motor, or other motor that can achieve forward and reverse rotation, which is not limited here. Exemplarily, the driving member can be used to drive the variable diameter wheel 120 to rotate forward and reverse, and then retract and release the rope, so that the lifting assembly 140 can be lifted and lowered relative to the cylinder 110.

[0059] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made based on the concept of the present application and the contents of the present application description and drawings, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A gravity balance system, characterized in that: include: A column having a receiving cavity; A diameter-changing wheel is disposed in the accommodating cavity of the cylinder and is hinged to the cylinder; An elastic member, disposed in the accommodating cavity of the column, the elastic member having a first end and a second end, the first end of the elastic member being connected to the column; A lifting assembly is slidably disposed on the column along a vertical direction; a first cable, wherein the first cable has a third end and a fourth end, the third end of the first cable is connected to the second end of the elastic member, the fourth end of the first cable is connected to the lifting assembly, and the first cable is wound around the variable diameter wheel; Among them, the cylinder has a first wall surface and a second wall surface that are arranged opposite to each other, and a third wall surface and a fourth wall surface that are arranged opposite to each other. The first wall surface, the third wall surface, the second wall surface and the fourth wall surface are connected in sequence and enclosed to form the accommodating cavity, and the axis of the variable diameter wheel is arranged at a uniform angle to the first wall surface and the third wall surface.

2. The gravity balance system according to claim 1, characterized in that: The angle between the axis of the variable diameter wheel and the first wall surface is greater than zero and less than or equal to 45 degrees.

3. The gravity balance system according to claim 1, characterized in that: The axis of the variable diameter wheel is perpendicular to one of the diagonals of the cylinder.

4. The gravity balance system according to claim 1, characterized in that: The variable diameter wheel has a first variable diameter section and a second variable diameter section, the first variable diameter section and the second variable diameter section have a smooth transition, the first cable is wound around the first variable diameter section and the second variable diameter section, the elastic member applies force to the first variable diameter section, and the lifting assembly applies force to the second variable diameter section.

5. The gravity balance system according to claim 4, characterized in that: In the axial direction of the reducing wheel, the diameter of one end of the first reducing section close to the second reducing section is greater than the diameter of one end of the first reducing section away from the second reducing section; the diameter of one end of the second reducing section close to the first reducing section is greater than the diameter of one end of the second reducing section away from the first reducing section.

6. The gravity balance system according to claim 4, characterized in that: The included angle between the first wall surface and the third wall surface is α, the included angle between the first wall surface and the fourth wall surface is β, and the taper angle of the second diameter-changing section is α or β.

7. The gravity balance system according to claim 6, characterized in that: The first wall surface is perpendicular to the third wall surface, the second diameter-changing section faces the first wall surface and the third wall surface, and the taper angle of the second diameter-changing section is 90 degrees.

8. The gravity balance system according to claim 1, characterized in that: The gravity balance system further includes a pulley assembly and a second cable, wherein the pulley assembly is disposed in the accommodating cavity of the cylinder, and the pulley assembly includes: A fixed pulley, coaxially arranged with the diameter-changing wheel; a movable pulley connected to the second end of the elastic member; The second cable has a fifth end and a sixth end, the fifth end of the second cable is connected to the cylinder, the sixth end of the second cable is connected to the third end of the first cable, and the second cable is wound around the fixed pulley and the movable pulley.

9. The gravity balance system according to claim 1, characterized in that: The column includes a first section and a second section connected to the first section, the variable diameter wheel is arranged in the first section, the elastic member is arranged in the second section, and the cross-sectional area of ​​the first section in a direction perpendicular to the length of the column is larger than the cross-sectional area of ​​the second section in a direction perpendicular to the length of the column.

10. A mobile radiation device, characterized in that: include: The gravity balancing system according to any one of claims 1 to 9; and A radiation module is connected to the lifting assembly.

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