Device for measuring center of uniform and regular object

Abstract

The utility model discloses a device for measuring the center of a uniform and regular object, which belongs to the technical field of debugging equipment of a magnetic resonance imaging system, and comprises a telescopic frame which comprises four telescopic arms of which the axes are respectively positioned on four sides of a horizontally arranged rectangle; the telescopic arm comprises a guide cylinder and a guide rod which can move relative to the axial direction; the telescopic support comprises two vertical telescopic rods capable of vertically stretching out and drawing back and a horizontal telescopic rod capable of horizontally stretching out and drawing back. The lower ends of the two vertical telescopic rods are fixed to the two opposite corners of the telescopic frame respectively. The horizontal telescopic rod is fixedly connected with the upper ends of the two vertical telescopic rods respectively; the moving part is movably arranged on the horizontal telescopic rod; a line pendant is arranged below the moving part, and the line pendant is hung on the moving part through a length-adjustable silk thread; according to the utility model, the telescopic frame can be sleeved outside the water mold and locked; the moving part is adjusted to enable the plummet to be located in the center of the horizontal telescopic rod, the silk thread is adjusted to fall on the water mold, and the falling point of the plummet is the center of the water mold.

Description

Technical Field

[0001] The utility model relates to the technical field of debugging equipment for magnetic resonance imaging systems, and particularly relates to a device for measuring the center of a uniform and regular object. Background Art

[0002] Magnetic resonance imaging is one of the most important imaging tools in current clinical medicine clinics and basic life science research; magnetic resonance imaging is an imaging technique that uses the signals generated by hydrogen atomic nuclei in a magnetic field to be reconstructed into images; each hydrogen proton in the human body can be regarded as a small magnet. Before entering a strong external magnetic field, the protons are arranged randomly. After being placed in a strong external magnetic field, they are arranged only in two directions parallel or antiparallel to the magnetic field lines of the external magnetic field; the protons parallel to the external magnetic field lines are at a low energy level, and those antiparallel to the magnetic field lines of the external magnetic field are at a high energy level, and the former is slightly more than the latter; under the excitation of a radio frequency pulse of a certain frequency, some of the protons at the low energy level jump into the high energy level and return to their original state after the radio frequency pulse stops. During this process, energy is released in the form of radio frequency signals. These released radio frequency signals that have been three-dimensionally space-encoded are received by an external body coil and reconstructed into images by a computer; magnetic resonance imaging technology is advancing rapidly. To effectively use various technologies, it involves a large amount of knowledge in different fields.

[0003] Before a magnetic resonance imaging device is officially used clinically, various sequences need to be continuously debugged to detect the quality of the images. During this process, because the production of nuclear magnetic resonance is not fully completed, it is not recommended to use human body scanning for debugging. Therefore, water phantoms that meet different sequence requirements and water phantoms that can hold various solutions are needed for comparison; on this basis, in order to be able to debug better and faster, it is particularly important to accurately know the center of the water phantom; at present, there is no dedicated equipment for measuring the center of the water phantom.

[0004] Therefore, it is an urgent problem to be solved at present to research and develop a device for measuring the center of a uniform and regular object that can accurately confirm the center of the water phantom and facilitate the debugging of magnetic resonance imaging devices. Content of the Utility Model

[0005] Regarding the problems existing in the prior art, the present utility model provides a device for measuring the center of a uniform and regular object. First, adjust the length of the vertical telescopic rod so that the horizontal telescopic rod will not interfere. Then, extend the telescopic arm so that the telescopic frame can be conveniently sleeved on the water phantom. The horizontal telescopic rod will extend accordingly. Shorten the length of the telescopic arm so that each telescopic arm abuts against the water phantom, and the water phantom can be firmly sleeved. The horizontal telescopic rod will shorten accordingly. Adjust the position of the moving part on the horizontal telescopic rod so that the point directly above the plumb bob is located at the center of the horizontal telescopic rod. Adjust the length of the silk thread so that the plumb bob falls on the water phantom. The landing point of the plumb bob is the center of the water phantom, which can accurately confirm the center of the water phantom, providing convenience for the debugging of magnetic resonance imaging equipment. The structure is simple, the cost is low, and it is easy to use.

[0006] In order to achieve the above object, the technical solution adopted by the present utility model is as follows:

[0007] The present utility model provides a device for measuring the center of a uniform and regular object, including:

[0008] A telescopic frame, the telescopic frame includes four sequentially connected telescopic arms, and the axes of the four telescopic arms are respectively located on the four sides of a horizontally arranged rectangle; the telescopic arm includes a guide tube extending along its axis and a guide rod, and the guide rod extends into the guide tube and can move axially along the telescopic arm relative to the guide tube;

[0009] A telescopic support, the telescopic support includes two vertical telescopic rods and one horizontal telescopic rod, the vertical telescopic rods are vertically arranged and can be telescoped axially, the horizontal telescopic rod is horizontally arranged and can be telescoped axially; the lower ends of the two vertical telescopic rods are respectively fixed at two diagonal corners of the telescopic frame; the horizontal telescopic rod is respectively fixedly connected to the upper ends of the two vertical telescopic rods;

[0010] A moving part, the moving part is arranged on the horizontal telescopic rod and can move axially along the horizontal telescopic rod; a plumb bob is arranged directly below the moving part, and the plumb bob is suspended on the moving part through a silk thread, and the length of the silk thread can be adjusted.

[0011] As a preferred technical solution, the horizontal telescopic rod is provided with scales distributed axially along it.

[0012] As a preferred technical solution, the horizontal telescopic rod includes a horizontal sleeve, and both ends of the horizontal sleeve are provided with horizontal moving rods extending into its interior. The horizontal moving rods are in clearance fit with the horizontal sleeve, and both horizontal moving rods can move axially along the horizontal telescopic rod relative to the horizontal sleeve.

[0013] As a preferred technical solution, the horizontal sleeve forms the moving part;

[0014] And / or, the scale is provided on the two horizontal movements;

[0015] And / or, the plumb bob is in an inverted conical shape.

[0016] As a preferred technical solution, a continuous channel is formed in the vertical telescopic rod, the horizontal movement rod and the horizontal sleeve. A first through hole is provided on the horizontal sleeve, and a second through hole is provided on one of the vertical telescopic rods. A wire winding wheel is provided on one side of the second through hole. The silk thread sequentially passes through the first through hole and the second through hole and is wound around the wire winding wheel.

[0017] As a preferred technical solution, a through hole is provided on the side wall of one end of the guide cylinder close to the guide rod, and a pressing block is provided in the through hole; a locking portion capable of driving the pressing block to move radially along the guide cylinder is provided outside the guide cylinder.

[0018] As a preferred technical solution, the locking portion includes a locking block, and the locking block abuts against the pressing block; a rotating shaft fixedly connected to the guide cylinder is provided on the guide cylinder, and the locking block is rotatably provided on the rotating shaft, and the rotating shaft is located at the eccentric point of the locking block.

[0019] As a preferred technical solution, a handle is provided on the locking block; when the handle is perpendicular to the plane where the axes of the four telescopic arms are located, the thickness of the portion of the locking block between the rotating shaft and the pressing block is the smallest.

[0020] As a preferred technical solution, a connecting elbow is provided between adjacent telescopic arms, and adjacent telescopic arms are fixedly connected to the connecting elbow, and the angle of the connecting elbow is set to 90°.

[0021] As a preferred technical solution, the cross sections of the guide cylinder and the guide rod are both square;

[0022] And / or, the guide cylinder and the guide rod are in clearance fit;

[0023] And / or, the axes of the guide cylinder and the guide rod are collinear.

[0024] The beneficial effects of the present utility model are manifested in:

[0025] First, adjust the length of the vertical telescopic rod of the present utility model so that there is no interference with the horizontal telescopic rod. Then, extend the telescopic arm, and the telescopic frame can be conveniently sleeved on the water mold. The horizontal telescopic rod will extend accordingly. Shorten the length of the telescopic arm so that each telescopic arm abuts against the water mold, and the water mold can be firmly sleeved. The horizontal telescopic rod will shorten accordingly. Adjust the position of the moving part on the horizontal telescopic rod so that the plumb bob is directly above the center of the horizontal telescopic rod. Adjust the length of the silk thread so that the plumb bob falls on the water mold. The landing point of the plumb bob is the center of the water mold, which can accurately confirm the center of the water mold, providing convenience for the debugging of magnetic resonance imaging equipment. The structure is simple, the cost is low, and it is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. is a schematic diagram of the overall structure of an embodiment of the device for measuring the center of a uniform and regular object of the present utility model;

[0027] Figure 2 is Figure 1 the schematic diagram of the telescopic arm in

[0028] Figure 3 is Figure 2 the schematic diagram of the locking part and the pressing block in

[0029] Figure 4 is Figure 1 the schematic diagram of the telescopic bracket in

[0030] Figure 5 is Figure 1 the schematic diagram of the connecting elbow in

[0031] In the figure: 1 - telescopic arm, 11 - guide cylinder, 12 - guide rod, 13 - pressing block, 14 - locking block, 15 - rotating shaft, 16 - handle, 2 - vertical telescopic rod, 3 - horizontal telescopic rod, 31 - horizontal sleeve, 32 - horizontal moving rod, 4 - plumb bob, 41 - silk thread, 42 - winding wheel, 5 - connecting elbow. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] For the convenience of those skilled in the art to understand, the present utility model will be further described below with reference to the accompanying drawings.

[0033] Please refer to Figures 1-5, which is an embodiment of the device for measuring the center of a uniform and regular object provided by the present utility model, includes a telescopic frame. The telescopic frame includes four telescopic arms 1 connected in sequence, and the axes of the four telescopic arms 1 are respectively located on the four sides of a horizontally arranged rectangle; the telescopic arm 1 includes a guide cylinder 11 and a guide rod 12 extending along its axis direction, and the guide rod 12 extends into the guide cylinder 11 and can move axially along the telescopic arm 1 relative to the guide cylinder 11; the telescopic support includes two vertical telescopic rods 2 and a horizontal telescopic rod 3. The vertical telescopic rods 2 are vertically arranged and can telescopic along their axes, and the horizontal telescopic rod 3 is horizontally arranged and can telescopic along its axis; the lower ends of the two vertical telescopic rods 2 are respectively fixed at two diagonal corners of the telescopic frame; the horizontal telescopic rod 3 is respectively fixedly connected to the upper ends of the two vertical telescopic rods 2, and the vertical telescopic rods 2 can adjust the distance between the horizontal telescopic rod 3 and the telescopic frame to avoid interference of the horizontal telescopic rod 3 when the telescopic frame is sleeved on the water mold; when pulling the diagonals of the telescopic frame, the lengths of the four telescopic arms 1 or two parallel telescopic arms 1 can be adjusted simultaneously, thereby adjusting the size of the telescopic frame, and the horizontal telescopic rod 3 will also telescopic accordingly; specifically, enlarge the telescopic frame and sleeve it on the water mold, and then shorten the four telescopic arms 1 until they abut against the water mold, then the telescopic frame can be sleeved on the water mold; the moving part is arranged on the horizontal telescopic rod 3 and can move axially along the horizontal telescopic rod 3; a plumb bob 4 is arranged directly below the moving part, and the plumb bob 4 is suspended on the moving part through a silk thread 41, and the length of the silk thread 41 can be adjusted. Adjust the position of the moving part so that the center of the plumb bob 4 is directly above the center of the horizontal telescopic rod 3, and extend the silk thread 41 so that the plumb bob 4 falls on the water mold, and the landing point of the plumb bob 4 is the center of the water mold, which can accurately confirm the center of the water mold.

[0034] Specifically, please refer to Figure 1 and Figure 4 , the plumb bob 4 is preferably in an inverted conical shape. When the lowest end of the plumb bob 4 contacts the water mold, the center of the water mold can be accurately positioned.

[0035] Furthermore, in order to ensure the smooth axial telescopic movement of the telescopic arm 1, the guide cylinder 11 and the guide rod 12 should be in clearance fit, and the axes of the guide cylinder 11 and the guide rod 12 should be collinear; in order to ensure that the guide cylinder 11 and the guide rod 12 do not rotate relative to each other, the cross-sections of the guide cylinder 11 and the guide rod 12 are preferably square.

[0036] It should be noted that the horizontal telescopic rod 3 should be provided with scales distributed along its axis, and according to the scales, the center of the plumb bob 4 can be accurately adjusted directly above the center of the horizontal telescopic rod 3.

[0037] In this embodiment, please refer to Figure 1 and Figure 4, the horizontal telescopic rod 3 includes a horizontal sleeve 31. Both ends of the horizontal sleeve 31 are provided with horizontal moving rods 32 extending into its interior. The horizontal moving rods 32 are in clearance fit with the horizontal sleeve 31. Both horizontal moving rods 32 can move relative to the horizontal sleeve 31 along the axial direction of the horizontal telescopic rod 3, so that the length of the horizontal telescopic rod 3 can be adjusted following the telescopic frame.

[0038] Further, please refer to Figure 1 and Figure 4 , a continuous channel is formed in the vertical telescopic rod 2, the horizontal moving rod 32 and the horizontal sleeve 31. The horizontal sleeve 31 is provided with a first through hole, and one vertical telescopic rod 2 is provided with a second through hole. A wire winding wheel 42 is provided on one side of the second through hole. The silk thread 41 passes through the first through hole, the channel and the second through hole in sequence and is wound around the wire winding wheel 42. The wire winding wheel 42 is arranged on the vertical telescopic rod 2. By rotating the wire winding wheel 42, the length of the silk thread 41 can be conveniently adjusted; specifically, the vertical telescopic rod 2 is preferably structured as a multi-stage sleeve nested in sequence, which can be conveniently telescoped in the vertical direction.

[0039] It should be noted that the relative position between the horizontal sleeve 31 and the horizontal moving rod 32 can be conveniently adjusted, which is the moving part; further, scales are preferably provided on the two horizontal moving parts, and the horizontal sleeve 31 is preferably made of a transparent material, so that the horizontal sleeve 31 can be conveniently adjusted to the middle of the horizontal telescopic rod 3 according to the scales.

[0040] In this embodiment, please refer to Figures 1-3 , a through hole is provided on the side wall of one end of the guide cylinder 11 close to the guide rod 12, and a pressing block 13 is arranged in the through hole; a locking part capable of driving the pressing block 13 to move radially along the guide cylinder 11 is arranged outside the guide cylinder 11. When the locking part is in the locked state, the pressing block 13 can be tightly pressed on the guide rod 12 to fix the guide cylinder 11 and the guide rod 12, so that the telescopic arm 1 is maintained at a specific length; when the locking part is in the open state, the pressing block 13 does not apply a pressing force to the guide rod 12, and the guide rod 12 can smoothly move along the guide cylinder 11 to realize the adjustment of the length of the telescopic arm 1; it should be noted that the radial direction of the guide cylinder 11 is based on the axis of the guide cylinder 11.

[0041] Further, please refer to Figures 1-3 , the locking part includes a locking block 14, and the locking block 14 abuts against the pressing block 13; a rotating shaft 15 fixedly connected to the guide cylinder 11 is arranged on the guide cylinder 11, the locking block 14 is rotatably arranged on the rotating shaft 15, the cross section of the locking block 14 is preferably circular, and the rotating shaft 15 is located at the eccentric point of the locking block 14. When the locking block 14 rotates around the rotating shaft 15, the thickness of the part of the locking block 14 located between the rotating shaft 15 and the pressing block 13 changes, and thus the pressing block 13 can be moved radially along the guide cylinder 11.

[0042] Further, please refer to Figures 1-3 A handle 16 is provided on the locking block 14. The locking block 14 can be conveniently rotated by the handle 16. When the handle 16 is perpendicular to the plane where the axes of the four telescopic arms 1 are located, the thickness of the part of the locking block 14 between the rotating shaft 15 and the pressing block 13 is the smallest. At this time, the locking part is in an open state, and while the length of the telescopic arm 1 can be conveniently adjusted, the handle 16 will not interfere with the water mold.

[0043] In this embodiment, please refer to Figure 1 and Figure 5 A connecting elbow 5 is provided between adjacent telescopic arms 1. Adjacent telescopic arms 1 are fixedly connected to the connecting elbow 5. The connecting elbow 5 can connect the telescopic arms 1 in sequence to form a telescopic frame, which is convenient for installation and production. Further, the inner wall surfaces of adjacent telescopic arms 1 used to form the telescopic frame should directly intersect and be perpendicular to each other, which can better fit the telescopic frame onto a water mold with a regular shape. Specifically, the angle of the connecting elbow 5 should be set to 90°, ensuring that the axes of adjacent telescopic arms 1 are perpendicular to each other. Further, connecting protrusions are preferably provided at both ends of the connecting elbow 5. Correspondingly, connecting holes matching the connecting protrusions are provided at both ends of the telescopic arm 1. The connecting protrusions are embedded in the connecting holes, and the connecting protrusions and the connecting holes can be fixedly connected by interference fit or welding.

[0044] Please refer to Figures 1-5 The specific usage method of the present utility model is as follows:

[0045] Put the locking part in the open state, pull the diagonal of the telescopic frame to make the telescopic frame larger, and the horizontal telescopic rod 3 will elongate accordingly; sleeved the telescopic frame on the water mold, squeeze the diagonal of the telescopic frame to make the telescopic frame smaller until the four telescopic arms 1 are all in contact with the water mold, and the horizontal telescopic rod 3 will shorten accordingly; rotate the handle 16 to make the locking part in the locked state and fix the telescopic frame.

[0046] Move the horizontal sleeve 31 to the middle of the horizontal telescopic rod 3 according to the scale, rotate the wire winding wheel 42 to release the silk thread 41 so that the plumb bob 4 slowly falls on the water mold, and the landing point of the plumb bob 4 is the center of the water mold.

[0047] It should be noted that as long as it is within the range of the telescopic frame, the center of any uniform and regular object can be measured by the present utility model, with a wider application range and greater flexibility.

[0048] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Device for measuring the center of a uniform and regular object, characterized in that, Comprising: A telescopic frame, the telescopic frame includes four sequentially connected telescopic arms (1), and the axes of the four telescopic arms (1) are respectively located on the four sides of a horizontally arranged rectangle; the telescopic arm (1) includes a guide cylinder (11) and a guide rod (12) extending along its axis, and the guide rod (12) extends into the guide cylinder (11) and can move axially along the telescopic arm (1) relative to the guide cylinder (11); A telescopic support, the telescopic support includes two vertically telescopic rods (2) and a horizontally telescopic rod (3), the vertically telescopic rods (2) are vertically arranged and can be telescoped axially, the horizontally telescopic rod (3) is horizontally arranged and can be telescoped axially; the lower ends of the two vertically telescopic rods (2) are respectively fixed at two diagonal corners of the telescopic frame; the horizontally telescopic rod (3) is fixedly connected to the upper ends of the two vertically telescopic rods (2) respectively; A moving part, the moving part is arranged on the horizontally telescopic rod (3) and can move axially along the horizontally telescopic rod (3); a plumb bob (4) is arranged directly below the moving part, and the plumb bob (4) is suspended on the moving part by a silk thread (41), and the length of the silk thread (41) can be adjusted.

2. The device for measuring the center of a uniform regular object according to claim 1, characterized in that, The horizontally telescopic rod (3) is provided with scales distributed axially along it.

3. The device for measuring the center of a uniform regular object according to claim 2, characterized in that, The horizontally telescopic rod (3) includes a horizontal sleeve (31), and both ends of the horizontal sleeve (31) are provided with horizontally moving rods (32) extending into its interior, and the horizontally moving rods (32) are in clearance fit with the horizontal sleeve (31), and both of the horizontally moving rods (32) can move axially along the horizontally telescopic rod (3) relative to the horizontal sleeve (31).

4. The device for measuring the center of a uniform regular object according to claim 3, characterized in that, The horizontal sleeve (31) forms the moving part; And / or, the scales are arranged on the two horizontally moving rods; And / or, the plumb bob (4) is in an inverted conical shape.

5. The device for measuring the center of a uniform regular object according to claim 3, wherein A continuous channel is formed in the vertically telescopic rod (2), the horizontally moving rod (32) and the horizontal sleeve (31), a first through hole is provided on the horizontal sleeve (31), a second through hole is provided on one of the vertically telescopic rods (2), a winding wheel (42) is provided on one side of the second through hole, and the silk thread (41) passes through the first through hole and the second through hole in sequence and is wound on the winding wheel (42).

6. The device for measuring the center of a uniform regular object according to claim 1, characterized in that, A through hole is provided on the side wall of one end of the guide cylinder (11) close to the guide rod (12), and a pressing block (13) is arranged in the through hole; a locking part capable of driving the pressing block (13) to move radially along the guide cylinder (11) is arranged outside the guide cylinder (11).

7. The device for measuring the center of a uniform regular object according to claim 6, characterized in that, The locking part includes a locking block (14), and the locking block (14) abuts against the pressing block (13); a rotating shaft (15) fixedly connected to the guide cylinder (11) is arranged on the guide cylinder (11), the locking block (14) is rotatably arranged on the rotating shaft (15), and the rotating shaft (15) is located at the eccentric point of the locking block (14).

8. The device for measuring the center of a uniform regular object according to claim 7, characterized in that, A handle (16) is provided on the locking block (14); when the handle (16) is perpendicular to the plane where the axes of the four telescopic arms (1) are located, the thickness of the part of the locking block (14) between the rotating shaft (15) and the pressing block (13) is the smallest.

9. The device for measuring the center of a uniform regular object according to claim 1, wherein A connecting elbow (5) is provided between adjacent telescopic arms (1), and adjacent telescopic arms (1) are fixedly connected to the connecting elbow (5), and the angle of the connecting elbow (5) is set to 90°.

10. The device for measuring the center of a uniform regular object according to claim 1, characterized in that, The cross-sections of the guide cylinder (11) and the guide rod (12) are both square. And / or, the guide cylinder (11) and the guide rod (12) are in clearance fit. And / or, the axis of the guide cylinder (11) is collinear with the axis of the guide rod (12).

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