Auxiliary positioning device for X-ray bone mineral density detection

Abstract

The invention discloses an auxiliary positioning device for X-ray bone mineral density detection. The auxiliary positioning device comprises a supporting assembly, a leg assembly and a positioning assembly. The positioning assembly is arranged in the middle of the supporting assembly; the leg assembly is arranged at the rear end of the positioning assembly; the positioning assembly comprises a hydraulic cylinder, a connecting shaft, a worm gear, a gear, a positioning motor, a worm, a telescopic shaft, a limiting key, a spring and a swinging body; hydraulic cylinders are fixedly connected to the bottoms of the supporting assemblies. Output shafts of the hydraulic cylinders are rotationally connected with connecting shafts; the upper end of the connecting shaft is in sliding connection with a gear; telescopic shafts are arranged at the upper ends of the gears; a plurality of limiting grooves are formed in the upper end of the telescopic shaft in an array mode, and springs are fixedly connected to the bottoms of the limiting grooves; limiting keys are arranged at the front ends of the springs; one side of the worm gear is meshed with a worm; two ends of the worm are rotatably connected with the supporting assembly, and one end penetrates through the supporting assembly and is provided with a positioning motor; fine adjustment of the body position of the patient is achieved, and it is ensured that the body of the patient is located at the correct position meeting the requirement during detection.

Description

Technical Field

[0001] The present invention belongs to the technical field of bone density detection, and particularly relates to an auxiliary positioning device for X-ray bone density detection. Background Art

[0002] Bone density is an important indicator reflecting bone strength, and its detection is of crucial significance for the diagnosis, treatment, and monitoring of bone diseases such as osteoporosis; through X-ray bone density detection, problems such as bone mass loss and osteoporosis can be detected early, providing a basis for clinical intervention and helping to prevent serious consequences such as fractures. Currently, dual-energy X-ray absorptiometry (DXA) is one of the commonly used gold standards for clinical bone density detection. Its principle is to calculate the bone density value by using the absorption difference when X-rays pass through bone tissue; during the detection process, the patient needs to maintain a specific body position to ensure that the detection site is accurately located at the scanning center, and the bones need to maintain specific angular and positional relationships.

[0003] However, many patients are difficult to adjust the correct positioning by themselves, and are prone to problems such as body skew, resulting in interrupted detection or inaccurate results, and need to be assisted by staff to adjust repeatedly, increasing the detection time and workload. Moreover, in actual detection, since the legs need to be adjusted according to different detection sites, such as opening and closing the legs and bending and straightening the knees, it is difficult for patients to maintain the correct positioning by themselves during the examination process and are prone to movement.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a device that can position the patient's body and at the same time adjust and fix the patient's legs. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention designs an auxiliary positioning device for X-ray bone density detection. By setting a positioning component on the support base, the worm and gear drive is used to drive the gear to rotate, and then the bed board slides left and right through meshing with the rack, thereby adjusting the left and right positions of the patient's body. At the same time, a hydraulic cylinder is set at the coaxial position of the gear. The connection between the telescopic shaft and the positioning slider is controlled by the telescopic movement of the hydraulic cylinder, and the bed board is driven to rotate through the limit key provided at the front end of the telescopic shaft, thereby achieving the adjustment of the patient's body position; at the same time, a leg component is set at the rear end of the bed board, and the opening and closing adjustment of the patient's legs and the bending adjustment of the knees are achieved through the cooperation of two vertical screws and sliders; thus ensuring the stability of the patient's body during the examination process and improving the accuracy of the examination results.

[0006] In order to achieve the above technical effects, the present invention is realized through the following technical solutions: an auxiliary positioning device for X-ray bone density detection, comprising: a support component, a leg component, and a positioning component.

[0007] A positioning component is arranged in the middle of the support component, and a leg component is arranged at the rear end of the positioning component;

[0008] The positioning component includes a hydraulic cylinder, a coupling shaft, a worm gear, a gear, a positioning motor, a worm, a telescopic shaft, a limit key, a spring, and a swinging body; the bottom of the support component is fixedly connected to the hydraulic cylinder; the output shaft of the hydraulic cylinder is rotatably connected to the coupling shaft; a worm gear is arranged at the lower end of the coupling shaft, and the upper end is slidably connected to the gear; a telescopic shaft is arranged at the upper end of the gear; the telescopic shaft is movably connected to the swinging body, and a plurality of limit grooves are arranged in an array at the upper end, and a spring is fixedly connected to the bottom of the limit groove; a limit key is arranged at the front end of the spring; a worm is arranged on one side of the worm gear in meshing; both ends of the worm are rotatably connected to the support component, and a positioning motor is arranged at one end penetrating the support component;

[0009] Further, the swinging body includes a positioning slider, a rack, a sliding limit groove, a sliding groove, a positioning sliding groove, and a bed board; a sliding limit groove is arranged at the bottom of the bed board, a sliding groove is communicated in the middle, a positioning sliding groove is communicated at the top and slidably connected to the positioning slider, and a leg component is arranged at the rear end; a hole is opened in the middle of the positioning slider to movably connect the telescopic shaft, and a plurality of grooves are arranged in an array on the inner wall of the top to movably connect the limit key; a rack is arranged on one side of the sliding groove to mesh with the gear;

[0010] Further, the height of the sliding groove is equal to the height of the positioning sliding groove, and is equal to twice the height of the limit key;

[0011] Further, the support component includes a support base and a support column; the inside of the support base is hollow, a support column is arranged at the bottom, the bottom of the support base is fixedly connected to the hydraulic cylinder, both sides are rotatably connected to the worm gear, and a positioning motor is fixedly connected to the outside;

[0012] Further, the leg component includes a leg support, a leg adjustment groove, a flexion and extension motor, a flexion and extension screw rod, a sliding rod, a flexion and extension slider, a spreading screw rod, a spreading motor, a spreading slider, a spreading sliding groove, and a leg slider; a leg adjustment groove is arranged at the rear end of the bed board, and a flexion and extension screw rod is horizontally arranged in the middle of the leg adjustment groove; the flexion and extension screw rod is threadedly connected to the flexion and extension slider, and a flexion and extension motor is arranged at the rear end penetrating the leg adjustment groove; sliding rods are symmetrically arranged at both ends of the flexion and extension slider; a leg slider is slidably connected to the sliding rod; the leg slider is slidably connected to the spreading sliding groove, and a leg support is arranged at the top; the spreading sliding groove penetrates the leg adjustment groove at the rear end to arrange a spreading slider; the spreading slider is threadedly connected to the spreading screw rod; a spreading motor is arranged at one end of the spreading screw rod;

[0013] Further, the spreading sliding groove is perpendicular to the sliding rod and the spreading screw rod;

[0014] Further, the two spreading screw rods are fixedly connected, and the thread pitches of the two spreading screw rods are the same, and the thread helix directions are opposite;

[0015] Further, the bottom surface of the leg support coincides with the top of the bed board.

[0016] The beneficial effects of the present invention are as follows:

[0017] In the present invention, the worm and worm gear drive in the positioning assembly drives the gear to rotate, and then realizes the left and right sliding of the bed board by meshing with the rack, which can accurately adjust the left and right positions of the patient's body. At the same time, the connection between the telescopic shaft and the positioning slider is controlled by the telescopic of the hydraulic cylinder, and the bed board is driven to rotate by relying on the limit key, realizing the fine adjustment of the patient's body position in multiple angles and dimensions, ensuring that the patient's body is in the correct position that meets the requirements during the detection, so that the detection part can be accurately located at the scanning center, and the bones can also maintain a specific angular and positional relationship, effectively avoiding the deviation of the detection results caused by the patient's body skew, inaccurate position, etc., and greatly improving the accuracy of the detection results.

[0018] At the same time, the leg assembly uses two vertical flexion and extension screws and spreading screws for positioning and driving, and in cooperation with the flexion and extension sliders, spreading sliders and leg sliders, can adjust the opening and closing of the patient's legs and the bending of the knees. The patient's legs can be maintained in a suitable posture according to the needs of different detection parts and remain stable during the whole examination process, avoiding the adverse effects on the detection results caused by improper leg postures or random movements, further ensuring the reliability of the detection data, and helping the clinic to diagnose, treat and monitor diseases based on accurate bone density detection values. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below.

[0020] Figure 1 is an overall structural schematic diagram of an auxiliary positioning device for X-ray bone density detection;

[0021] Figure 2 is an exploded view of the leg assembly of an auxiliary positioning device for X-ray bone density detection;

[0022] Figure 3 is a top view of an auxiliary positioning device for X-ray bone density detection;

[0023] Figure 4 is a front view of the leg support of an auxiliary positioning device for X-ray bone density detection;

[0024] Figure 5 is a side sectional view of an auxiliary positioning device for X-ray bone density detection;

[0025] Figure 6 is an exploded view of the swinging assembly of an auxiliary positioning device for X-ray bone density detection;

[0026] Figure 7 It is a cross-sectional view of the bed board of an auxiliary positioning device for X-ray bone density detection;

[0027] Figure 8 It is a schematic diagram A of the partial structure of an auxiliary positioning device for X-ray bone density detection;

[0028] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0029] 1 - Support assembly, 101 - Support column, 102 - Support base, 2 - Leg assembly, 201 - Leg support, 202 - Leg adjustment groove, 203 - Flexion and extension motor, 204 - Flexion and extension screw, 205 - Slide bar, 206 - Flexion and extension slider, 207 - Spreading screw, 208 - Spreading motor, 209 - Spreading slider, 210 - Spreading chute, 211 - Leg slider, 3 - Positioning assembly, 301 - Hydraulic cylinder, 302 - Coupling shaft, 303 - Worm gear, 304 - Gear, 305 - Positioning motor, 306 - Worm, 307 - Oscillating body, 3071 - Positioning slider, 3072 - Rack, 3073 - Slide limit groove, 3074 - Slide groove, 3075 - Positioning chute, 3076 - Bed board, 308 - Telescopic shaft, 309 - Limit key, 310 - Spring. Detailed implementation manners

[0030] The present invention discloses an auxiliary positioning device for X-ray bone density detection, including: a support assembly 1, a leg assembly 2, and a positioning assembly 3; the positioning assembly 3 is arranged in the middle of the support assembly 1, and the leg assembly 2 is arranged at the rear end of the positioning assembly 3; the positioning assembly 3 includes a hydraulic cylinder 301, a coupling shaft 302, a worm gear 303, a gear 304, a positioning motor 305, a worm 306, a telescopic shaft 308, a limit key 309, a spring 310, and an oscillating body 307; the bottom of the support assembly 1 is fixedly connected to the hydraulic cylinder 301; the output shaft of the hydraulic cylinder 301 is rotatably connected to the coupling shaft 302; the lower end of the coupling shaft 302 is provided with a worm gear 303, and the upper end is slidably connected to the gear 304; the upper end of the gear 304 is provided with a telescopic shaft 308; the telescopic shaft 308 is movably connected to the oscillating body 307, and a plurality of limit grooves are arranged in an array at the upper end, and the bottom of the limit groove is fixedly connected to the spring 310; the front end of the spring 310 is provided with a limit key 309; one side of the worm gear 303 is meshed with a worm 306; both ends of the worm 306 are rotatably connected to the support assembly 1, and one end penetrates through the support assembly 1 to be provided with a positioning motor 305; it realizes fine adjustment of the patient's body position from multiple angles and dimensions, ensuring that the patient's body is in the correct position that meets the requirements during the detection.

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0032] Embodiment 1

[0033] As shown in Figure 1 , 5 -8, the positioning component 3 includes a hydraulic cylinder 301, a coupling shaft 302, a worm gear 303, a gear 304, a positioning motor 305, a worm 306, a telescopic shaft 308, a limit key 309, a spring 310, and a swinging body 307; the bottom of the support component 1 is fixedly connected to the hydraulic cylinder 301; the output shaft of the hydraulic cylinder 301 is rotationally connected to the coupling shaft 302; a worm gear 303 is arranged at the lower end of the coupling shaft 302, and the upper end is slidably connected to the gear 304; the telescopic shaft 308 is arranged at the upper end of the gear 304; the telescopic shaft 308 is movably connected to the swinging body 307, and a plurality of limit grooves are arranged in an array at the upper end, and the bottom of the limit groove is fixedly connected to the spring 310; the limit key 309 is arranged at the front end of the spring 310; the worm 306 is engaged with one side of the worm gear 303; both ends of the worm 306 are rotationally connected to the support component 1, and a positioning motor 305 is arranged at one end penetrating the support component 1;

[0034] The swinging body 307 includes a positioning slider 3071, a rack 3072, a sliding limit groove 3073, a sliding groove 3074, a positioning sliding groove 3075, and a bed plate 3076; the sliding limit groove 3073 is arranged at the bottom of the bed plate 3076, the sliding groove 3074 is communicated in the middle, the positioning sliding groove 3075 is communicated at the top and slidably connected to the positioning slider 3071, and the leg component 2 is arranged at the rear end; a hole is opened in the middle of the positioning slider 3071 and movably connected to the telescopic shaft 308, and a plurality of grooves are arranged in an array on the inner wall of the upper end and movably connected to the limit key 309; the rack 3072 is engaged with the gear 304 on one side of the sliding groove 3074; the height of the sliding groove 3074 is equal to the height of the positioning sliding groove 3075, and is equal to twice the height of the limit key 309;

[0035] The support component 1 includes a support base 102 and a support column 101; the inside of the support base 102 is hollow, the support column 101 is arranged at the bottom, the bottom of the support base 102 is fixedly connected to the hydraulic cylinder 301, the worm gears 303 are rotationally connected to both sides, and the positioning motor 305 is fixedly connected to the outside;

[0036] In this embodiment, the working principle of the swing assembly is as follows: By starting the positioning motor 305, the worm 306 is driven to rotate. The worm 306 meshes with the worm wheel 303, causing the worm wheel 303 to rotate. The rotation of the worm wheel 303 drives the coupling shaft 302 to rotate, and the gear 304 at the upper end of the coupling shaft 302 rotates accordingly. Since the gear 304 meshes with the rack 3072 on one side of the sliding groove 3074 at the bottom of the bed plate 3076, the rotational motion of the gear 304 is converted into the left - right linear sliding of the bed plate 3076 along the sliding limit groove 3073. By controlling the forward and reverse rotation and the rotation angle of the positioning motor 305, the left - right position of the bed plate 3076 can be accurately adjusted to meet the requirements for the left - right position of the patient's body in different detection scenarios.

[0037] Through the telescopic movement of the hydraulic cylinder 301, its output shaft drives the coupling shaft 302 to move up and down. When moving upward, the gear 304 at the upper end of the coupling shaft 302 slides upward, connecting the telescopic shaft 308 to the positioning slider 3071. At this time, the limiting key 309 at the front end of the telescopic shaft 308 is snapped into the groove on the inner wall of the top of the positioning slider 3071 under the action of the spring 310. Thus, through the transmission of the worm wheel 303 and the worm 306, the telescopic shaft 308 is driven to rotate. Through the circumferential limit of the limiting key 309, the telescopic shaft 308 drives the bed plate 3076 to rotate left and right, thereby adjusting the angle of the patient's body and making the patient in a suitable detection position.

[0038] In this embodiment, the limiting key is located at the lower end of the telescopic shaft. After the hydraulic cylinder retracts, the telescopic seat remains in contact with the positioning slider and is rotatably connected to it.

[0039] In this embodiment, the left - right sliding of the bed plate 3076 is achieved through the transmission of the worm wheel 303 and the worm 306, which drives the gear 304 to mesh with the rack 3072. The transmission of the worm wheel 303 and the worm 306 has high transmission accuracy and stability, and can accurately control the displacement of the bed plate 3076 in the horizontal direction, thereby accurately adjusting the left - right position of the patient's body to the ideal area for X - ray scanning. This ensures the consistency and accuracy of the patient's body during each detection, reduces detection errors caused by left - right position deviations, and improves the reliability and repeatability of the detection results. At the same time, by controlling the disengagement of the telescopic shaft 308 and the positioning slider 3071 through the hydraulic cylinder 301, the left - right sliding and angle adjustment of the bed plate 3076 can be controlled separately, making the overall structure of the device more compact.

[0040] Embodiment 2

[0041] As shown in the appendix Figure 1-4As shown in the figure, the leg assembly 2 includes a leg support 201, a leg adjustment groove 202, a flexion and extension motor 203, a flexion and extension screw 204, a sliding rod 205, a flexion and extension slider 206, a spreading screw 207, a spreading motor 208, a spreading slider 209, a spreading chute 210, and a leg slider 211; a leg adjustment groove 202 is provided at the rear end of the bed board 3076, and a flexion and extension screw 204 is horizontally arranged in the middle of the leg adjustment groove 202; the flexion and extension screw 204 is threadedly connected to the flexion and extension slider 206, and the flexion and extension motor 203 is arranged at the rear end penetrating through the leg adjustment groove 202; sliding rods 205 are symmetrically arranged at both ends of the flexion and extension slider 206; the leg slider 211 is slidably connected to the sliding rod 205; the leg slider 211 is slidably connected to the spreading chute 210, and the leg support 201 is arranged at the top; the spreading slider 209 is arranged at the rear end penetrating through the leg adjustment groove 202 of the spreading chute 210; the spreading slider 209 is threadedly connected to the spreading screw 207; one end of the spreading screw 207 is provided with the spreading motor 208; the spreading chute 210 is perpendicular to the sliding rod 205 and the spreading screw 207; the two side spreading screws 207 are fixedly connected, and the thread pitches of the two side spreading screws 207 are the same and the thread rotation directions are opposite; the bottom surface of the leg support 201 coincides with the top of the bed board 3076;

[0042] In this embodiment, the working principle of the leg assembly 2 is as follows: by starting the spreading motor 208, the spreading screw 207 is driven to rotate; since the two side spreading screws 207 are fixedly connected and have the same thread pitch and opposite thread rotation directions, when the spreading screw 207 rotates, the spreading slider 209 threadedly connected thereto will perform a linear motion towards or away from each other in the spreading chute 210 perpendicular to the axial direction of the leg adjustment groove 202; the movement of the spreading slider 209 drives the leg slider 211 to move synchronously on the sliding rod 205, and the leg support 201 is connected to the top of the leg slider 211, thereby realizing the opening and closing actions of the leg support 201;

[0043] By starting the flexion and extension motor 203, the flexion and extension screw 204 is driven to rotate. The flexion and extension screw 204 is horizontally arranged in the middle of the leg adjustment groove 202, and the flexion and extension slider 206 is threadedly connected to the flexion and extension screw 204; as the flexion and extension screw 204 rotates, the flexion and extension slider 206 will perform a linear motion along the axial direction of the flexion and extension screw 204, thereby driving the sliding rods 205 at both ends to slide therewith; driving the connected leg structure to move, and further realizing the bending and straightening actions of the leg knee;

[0044] In this embodiment, by combining the transmission of the flexion and extension screw 204 with the flexion and extension slider 206, and the opening screw 207 with the opening slider 209, the flexion and extension and the opening and closing of the leg can be adjusted simultaneously. The multi-dimensional adjustment function can meet the diverse requirements of different detection parts for the leg posture. During hip joint detection, the leg can be opened to an appropriate angle and the knee can be kept straight. During knee joint detection, the bending degree of the leg can be flexibly adjusted to fully expose the detection part and place it in the best scanning position, greatly improving the versatility of the device, reducing the situation where certain parts cannot be detected due to leg posture limitations, and broadening the application scope of the device.

[0045] In summary, in the present invention, the worm gear 303 and the worm 306 in the positioning component 3 drive the gear 304 to rotate, and then the left and right sliding of the bed board 3076 is realized by meshing with the rack 3072, which can accurately adjust the left and right position of the patient's body. At the same time, the connection between the telescopic shaft 308 and the positioning slider 3071 is controlled by the telescopic movement of the hydraulic cylinder 301, and the bed board 3076 is driven to rotate by relying on the limit key 309, realizing the fine adjustment of the patient's body position in multiple angles and dimensions, ensuring that the patient's body is in the correct position that meets the requirements during detection, enabling the detection part to be accurately located at the scanning center, and the bones can also maintain a specific angular and positional relationship, effectively avoiding the deviation problem of the detection result caused by the patient's body skew, inaccurate position, etc., and greatly improving the accuracy of the detection result.

[0046] At the same time, the leg component 2 is positioned and driven by two perpendicular flexion and extension screws 204 and opening screws 207, and in cooperation with the flexion and extension slider 206, the opening slider 209 and the leg slider 211, it can adjust the opening and closing of the patient's leg and the bending of the knee. The patient's leg can be maintained in a suitable posture according to the requirements of different detection parts and remain stable during the entire examination process, avoiding the adverse impact on the detection result caused by improper leg posture or random movement, further ensuring the reliability of the detection data, and helping the clinic to diagnose, treat and monitor diseases based on accurate bone density detection values.

[0047] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described.

Claims

1. An auxiliary positioning device for X-ray bone density detection, characterized in that: Including: support component, leg component, positioning component; A positioning assembly is arranged in the middle of the support assembly, and a leg assembly is arranged at the rear end of the positioning assembly; The positioning assembly includes a hydraulic cylinder, a coupling, a worm wheel, a gear, a positioning motor, a worm, a telescopic shaft, a limit key, a spring, and a swing body; the bottom of the support assembly is fixedly connected to the hydraulic cylinder; the output shaft of the hydraulic cylinder is rotatably connected to the coupling; a worm wheel is provided at the lower end of the coupling, and the upper end is slidably connected to the gear; a telescopic shaft is provided at the upper end of the gear; the telescopic shaft is movably connected to the swing body, and a plurality of limit grooves are provided in an array at the upper end, and the bottom of the limit groove is fixedly connected to the spring; a limit key is provided at the front end of the spring; a worm is provided on one side of the worm wheel for meshing; both ends of the worm are rotatably connected to the support assembly, and one end penetrates the support assembly to provide a positioning motor.

2. The auxiliary positioning device for X-ray bone density detection according to claim 1, characterized in that: The swinging body includes a positioning slider, a rack, a sliding limit groove, a sliding groove, a positioning slider, and a bed board; a sliding limit groove is arranged at the bottom of the bed board, a sliding groove is arranged in the middle, a positioning slider is arranged at the top to be slidably connected to the positioning slider, and a leg assembly is arranged at the rear end; a hole is arranged in the middle of the positioning slider to be movably connected to the telescopic shaft, and a plurality of grooves are arranged in a row on the inner wall of the top to be movably connected to the limit keys; a rack is arranged on one side of the sliding groove to engage the gear.

3. The auxiliary positioning device for X-ray bone density detection according to claim 2, characterized in that: The height of the sliding groove is equal to the height of the positioning sliding groove and is equal to twice the height of the limit key.

4. The auxiliary positioning device for X-ray bone density detection according to claim 1, characterized in that: The support assembly includes a support seat and a support column; the interior of the support seat is set to be hollow, and a support column is set at the bottom. The bottom of the support seat is fixedly connected to the hydraulic cylinder, the two sides are rotatably connected to the worm gear, and the outer side is fixedly connected to the swing motor.

5. The auxiliary positioning device for X-ray bone density detection according to claim 1, characterized in that: The leg assembly includes a leg support, a leg adjustment slot, a flexion and extension motor, a flexion and extension screw, a sliding rod, a flexion and extension slider, an opening screw, an opening motor, an opening slider, an opening slide slot, and a leg slider; a leg adjustment slot is arranged at the rear end of the bed board, and a flexion and extension screw is arranged horizontally in the middle of the leg adjustment slot; the flexion and extension screw is threadedly connected to the flexion and extension slider, and the rear end penetrates the leg adjustment slot to set the flexion and extension motor; sliding rods are symmetrically arranged at both ends of the flexion and extension slider; the sliding rod is slidably connected to the leg slider; the leg slider is slidably connected to the opening slide slot, and a leg support is arranged on the top; the rear end of the opening slide slot penetrates the leg adjustment slot to set the opening slider; the opening slider is threadedly connected to the opening screw; an opening motor is arranged at one end of the opening screw.

6. The auxiliary positioning device for X-ray bone density detection according to claim 5, characterized in that: The opening slide groove is perpendicular to the sliding rod and the opening screw rod.

7. The auxiliary positioning device for X-ray bone density detection according to claim 5, characterized in that: The open screws on both sides are fixedly connected, and the thread pitches of the open screws on both sides are the same, and the thread rotation directions are opposite.

8. The auxiliary positioning device for X-ray bone density detection according to claim 5, characterized in that: The bottom surface of the leg support coincides with the top of the bed board.

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