Self-balancing nuclear magnetic cold head test frame

Abstract

The utility model discloses a self-balancing nuclear magnetic cold head testing frame which comprises a bottom frame, two telescopic supports which are symmetrically distributed are installed on one side of the upper surface of the bottom frame, lower trays are fixedly installed on the two telescopic supports, and two first-level rotating seats which are symmetrically distributed are installed on the other side of the upper surface of the bottom frame. Adjusting inclined rods are rotationally connected to the two first-stage rotating seats, second-stage rotating seats are rotationally connected to the top ends of the two adjusting inclined rods, upper supports are fixedly installed above the two second-stage rotating seats, and the lower surfaces of the two upper supports are in sliding contact with the two lower trays correspondingly; according to the utility model, the position of the test cylinder body is adjusted and changed, the weight of the end part of the extended lower bracket is adjusted, and the symmetrically distributed bearing seats are fixedly arranged on the upper surfaces of the two upper brackets to carry out gravity balance adjustment on the horizontal test cylinder body, so that the effect of adjusting different angles and heights in the mode is achieved; gravity balance adjustment work of the test cylinder bodies at different angles is completed, and the stable test effect of the test angle is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear magnetic resonance cold head testing, in particular to a self-balancing nuclear magnetic resonance cold head testing frame. Background Art

[0002] The magnetic resonance imaging system is a medical imaging system that has no ionizing radiation, can perform arbitrary orientation, multi-parameter contrast, and high soft tissue contrast imaging. It can examine all parts of the human body and is an indispensable large-scale imaging examination equipment for medical institutions.

[0003] The cooling efficiency of the cold head used for superconducting magnetic resonance will gradually decrease over time and needs to be replaced regularly. The cold head processed according to the specification needs to be professionally tested and can only be installed and used after the parameters meet the standards. The existing test platform structure and operation are very complex, and the cost is also high;

[0004] The existing public technology CN202222138378.0 discloses a cold head test device, which includes a bracket, a tray, a cold head and a cylinder body, a first shaft seat is fixed on the left side of the top of the bracket, and a second shaft seat is fixed on the right side of the top of the bracket, the tray is horizontally arranged between the first shaft seat and the second shaft seat, and the tray is rotatably connected with the first shaft seat and the second shaft seat; a through hole is vertically formed in the middle of the tray, a groove is formed at the upper end of the through hole, the cold head is vertically arranged in the through hole and the upper edge of the cold head is connected to the groove; a shielding cover and a cylinder body are vertically fixed to the bottom of the tray, the shielding cover is vertically fixed to the lower end of the through hole and the cold head is arranged in the shielding cover, and the cylinder body is vertically sleeved on the bottom of the tray; a cable groove is horizontally formed in the tray, an exhaust hole that passes through the bottom of the tray is formed on one side of the tray, and a wire entry hole that passes through the cable groove is formed on the other side of the tray. The existing technology has a simple design structure, is easy to process, is easy to operate, and has a low cost. It can simulate the operating environment of the cold head, thereby meeting the test requirements;

[0005] The above-mentioned prior art is a utility model patent applied for by our company in 2022. However, in actual application, it was found that when the cold head is rotated to different positions, it will cause different gravity distribution. The gravity balance cannot be adjusted relying on the structure of the above-mentioned prior art. Therefore, when in use, the test frame has uneven force on both sides, which affects the stability of the test frame. For this reason, the utility model makes technical improvements to the above-mentioned prior art and proposes a self-balancing nuclear magnetic cold head test frame. Utility Model Content

[0006] The utility model aims to provide a self-balancing nuclear magnetic cold head test stand to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a self-balancing nuclear magnetic cold head test stand, comprising a base frame, two symmetrically distributed telescopic brackets are installed on one side of the upper surface of the base frame, and lower trays are fixedly installed on the two telescopic brackets, and two symmetrically distributed primary rotating seats are installed on the other side of the upper surface of the base frame, and the two primary rotating seats are rotatably connected with adjusting inclined rods, and the tops of the two adjusting inclined rods are rotatably connected with secondary rotating seats, and upper brackets are fixedly installed above the two secondary rotating seats, and the lower surfaces of the two upper brackets are respectively in sliding contact with the two lower trays, and symmetrically distributed bearing seats are fixedly installed on the upper surfaces of the two upper brackets, and a rotating shaft is rotatably installed between the two bearing seats, and a test cylinder body is fixedly installed in the middle of the rotating shaft.

[0008] Preferably, a flange wheel is fixedly mounted on one end of the rotating shaft, and four groups of positioning holes are opened on the outer surface of the flange wheel.

[0009] Preferably, a positioning plate is fixedly mounted on the outer wall of the upper bracket close to the flange wheel side, and a positioning pin is movably inserted into the positioning plate.

[0010] Preferably, movable wheels are fixedly mounted at the four corners of the lower surface of the base frame by fixing bolts.

[0011] Preferably, the telescopic bracket includes a supporting frame and a telescopic frame, the telescopic frame is inserted into the supporting frame, the telescopic frame and the supporting frame are movably connected, a plurality of threaded holes are opened on the supporting frame, and corresponding threaded pins are arranged in the threaded holes.

[0012] Preferably, the lower tray adopts a "concave" structure design.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model can freely adjust the inclination angle of the adjustable inclined rod and the overall height of the telescopic bracket, thereby driving the test cylinder and the upper bracket on the inclined rod and the telescopic bracket to change their positions, so that the top end of the test cylinder is placed at the center position of the bottom bracket, and the top end of the lower bracket will extend outward for a certain distance during the downward adjustment process, so that the gravity balance adjustment of the horizontal test cylinder is carried out by adjusting the position of the test cylinder and the weight of the extended lower bracket end, so that the gravity balance adjustment of the test cylinder at different angles is completed through the different angle and height adjustment effects of the above method, so as to achieve a stable test effect at the test angle, balance the double-sided force conditions of the test frame, increase the test stability of the test frame, and improve the test quality, so that the utility model can have a self-balancing dynamic adjustment characteristic, easy adjustment, and good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a left-side stereoscopic structural schematic diagram of an embodiment of the utility model;

[0016] Figure 2 This is a bottom-up structural schematic diagram of an embodiment of the utility model;

[0017] Figure 3 It is a right-side perspective structural diagram of an embodiment of the utility model;

[0018] Figure 4 For the utility model embodiment Figure 3 Schematic diagram of the enlarged structure of area A.

[0019] In the figure: 1. base frame; 2. telescopic bracket; 3. lower tray; 4. primary rotating seat; 5. adjusting diagonal rod; 6. secondary rotating seat; 7. upper bracket; 8. bearing seat; 9. rotating shaft; 10. test cylinder body; 11. flange wheel; 12. positioning hole; 13. positioning plate; 14. positioning pin; 15. moving wheel. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See also Figure 1-4The utility model provides an embodiment: a self-balancing nuclear magnetic cold head test stand, comprising a base frame 1, two symmetrically distributed telescopic brackets 2 are installed on one side of the upper surface of the base frame 1, wherein the telescopic bracket 2 comprises a support frame and a telescopic bracket, the telescopic bracket is inserted into the support frame, the telescopic bracket and the support frame are movably connected, a plurality of threaded holes are opened on the support frame, and threaded pins corresponding thereto are arranged in the threaded holes;

[0024] In this way, the length of the frame can be freely adjusted through the telescopic bracket 2. When positioning is required, the threaded pin can be screwed into the threaded hole, so that the threaded pin can tightly fix the internal telescopic bracket to achieve a certain tightening effect. This tightening fixing method can conveniently fix the telescopic bracket at any height. When used specifically, it has the technical characteristics of a large height adjustment range and a wide adjustment range, and is more practical.

[0025] The two telescopic brackets 2 are fixedly mounted with lower trays 3, and the lower trays 3 adopt a "concave" structure design. Two symmetrically distributed primary rotating seats 4 are installed on the other side of the upper surface of the bottom frame 1. The two primary rotating seats 4 are rotatably connected with adjusting inclined rods 5. The tops of the two adjusting inclined rods 5 are rotatably connected with secondary rotating seats 6. Upper brackets 7 are fixedly mounted on the two secondary rotating seats 6. The lower surfaces of the two upper brackets 7 are respectively in sliding contact with the two lower trays 3, as shown in the attached manual. Figure 1 As shown, the lower bracket 7 is placed in the concave groove of the lower tray 3. The lower tray 3 can be used to limit the side wrapping of the lower bracket 7 to prevent the lower bracket 7 from sliding off the side of the lower tray 3, thereby improving the limiting stability;

[0026] The upper surfaces of the two upper brackets 7 are fixedly mounted with symmetrically distributed bearing seats 8, a rotating shaft 9 is rotatably mounted between the two bearing seats 8, and a test cylinder 10 is fixedly mounted in the middle of the rotating shaft 9;

[0027] According to the above structure, when the test cylinder 10 needs to be adjusted for gravity balance at different angles, gravity balance can be performed by adjusting the height of the telescopic bracket 2 and the inclination angle of the inclined rod 5:

[0028] For example, when the adjustment angle of the test cylinder 10 is Figure 1 When the vertical position shown is rotated 90° clockwise to the horizontal position, the overall height of the telescopic bracket 2 can be lowered, and the secondary rotating seat 6 at the top of the adjusting diagonal rod 5 needs to be flush with the level of the lower tray 3 to maintain the horizontality of the lower bracket 7;

[0029] At this time, the adjusting inclined rod 5 is rotated clockwise along the primary rotating seat 4 by a certain angle, so that the lower bracket 7 at its top can be placed horizontally on the lower tray 3. During the adjustment process, the angle between the primary rotating seat 4 and the adjusting inclined rod 5 gradually decreases until the lower bracket 7 can be placed horizontally on the lower tray 3, and the adjustment is completed.

[0030] After the adjustment is completed, the position of the lower bracket 7 and the position of the test cylinder 10 will change, that is, the lower bracket 7 drives the test cylinder 10 to move to the side of the telescopic bracket 2, so that the top end of the test cylinder 10 is placed in the center position of the base frame 1 again, and the top end of the lower bracket 7 will extend outward for a distance during the downward adjustment process, so that the tail of the horizontal test cylinder 10 is balanced and adjusted by adjusting the position of the test cylinder 10 and the weight of the extended end of the lower bracket 7, so that the gravity balance adjustment of the test cylinder 10 at different angles is completed through the different angle and height adjustment effects of the above method, so as to achieve a stable effect of the test angle, make the bilateral force conditions of the test frame tend to be balanced, increase the test stability of the test frame, and improve the test quality, so that the utility model can have a self-balancing dynamic adjustment characteristic, easy adjustment, and good practicality.

[0031] In this embodiment, in order to facilitate the positioning of the test angle of the test cylinder 10, a flange wheel 11 is fixedly mounted on one end of the rotating shaft 9, and four groups of positioning holes 12 are opened on the outer surface of the flange wheel 11. When the flange wheel 11 rotates, the four groups of positioning holes 12 correspond to the inclination angles of the test cylinder 10 of 0°, 45°, 90° and 120° respectively;

[0032] Furthermore, a positioning plate 13 is fixedly mounted on the outer wall of the upper bracket 7 near the flange wheel 11, and a positioning pin 14 is movably inserted into the positioning plate 13;

[0033] With this structural design, when the flange wheel 11 drives the test cylinder body 10 to rotate to a certain tilt test angle, the positioning hole 12 of the corresponding angle can be horizontally aligned with the positioning pin 14, so that the positioning pin 14 can be inserted into the positioning hole 12, so that the test cylinder body 10 on the flange wheel 11 can be positioned at a tilt angle through the set positioning pin 14 and the positioning hole 12, so that the test cylinder body 10 always maintains the same tilt angle unchanged, and through the free adjustment and positioning of the tilt angle, the utility model has the use effect of multiple tilt angle tests.

[0034] In this embodiment, in order to facilitate the quick movement of the test stand of the utility model and improve the convenience of use, moving wheels 15 are fixedly installed at the four corners of the lower surface of the base frame 1 by fixing bolts.

[0035] Working principle: When in use, the cold head to be tested is installed on the test cylinder 10, and the wire is connected to the external test equipment, so that the automatic test of the cold head can be carried out;

[0036] The utility model is provided with a flange wheel 11, which can be rotated manually, so that the rotation of the flange wheel 11 drives the rotating shaft 9 to rotate synchronously. When the rotating shaft 9 rotates, it drives the end of the test cylinder 10 to rotate, so that the test angle of the test cylinder 10 changes;

[0037] When the flange wheel 11 drives the test cylinder 10 to rotate to a certain tilt test angle, the positioning hole 12 of the corresponding angle can be horizontally aligned with the positioning pin 14, so that the positioning pin 14 can be inserted into the corresponding positioning hole 12, so that the test cylinder 10 on the flange wheel 11 can be positioned and fixed at an inclined angle through the provided positioning pin 14 and the positioning hole 12, so that the test cylinder 10 always maintains the same tilt angle unchanged. By freely adjusting and positioning the tilt angle, the utility model has the use effect of multiple tilt angle tests, and can perform performance tests on cold heads in different angle states;

[0038] When it is necessary to adjust the gravity balance of the test cylinder 10 at different angles, the gravity balance can be adjusted by adjusting the height of the telescopic bracket 2 and the inclination angle of the inclined rod 5:

[0039] For example, when the adjustment angle of the test cylinder 10 is Figure 1 When the vertical position shown is rotated 90° clockwise to the horizontal position, the overall height of the telescopic bracket 2 can be lowered, and the secondary rotating seat 6 at the top of the adjusting diagonal rod 5 needs to be flush with the level of the lower tray 3 to maintain the horizontality of the lower bracket 7;

[0040] At this time, the adjusting inclined rod 5 can rotate clockwise along the primary rotating seat 4 by a certain angle, so that the lower bracket 7 at its top can be placed horizontally on the lower tray 3. During the adjustment process, the angle between the primary rotating seat 4 and the adjusting inclined rod 5 gradually decreases until the lower bracket 7 can be placed horizontally on the lower tray 3, and the adjustment is completed.

[0041] After the adjustment is completed, the position of the lower bracket 7 and the position of the test cylinder 10 will change, that is, the lower bracket 7 drives the test cylinder 10 to move to the side of the telescopic bracket 2, so that the top end of the test cylinder 10 is placed in the center position of the base frame 1 again, and the top end of the lower bracket 7 will extend outward for a distance during the downward adjustment process, so that the horizontal test cylinder 10 is gravity-balanced and adjusted by adjusting the position of the test cylinder 10 and the weight of the extended end of the lower bracket 7, so that the gravity balance adjustment of the test cylinder 10 at different angles is completed through the different angle and height adjustment effects of the above-mentioned method, so as to achieve a stable test effect at the test angle, balance the bilateral force conditions of the test frame, increase the test stability of the test frame, and improve the test quality, so that the utility model can have a self-balancing dynamic adjustment characteristic, easy adjustment, and good practicality.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A self-balancing nuclear magnetic cold head test stand, comprising a base frame (1), characterized in that: Two symmetrically distributed telescopic brackets (2) are installed on one side of the upper surface of the base frame (1), and the two telescopic brackets (2) are fixedly installed with a lower tray (3). Two symmetrically distributed primary rotating seats (4) are installed on the other side of the upper surface of the base frame (1). The two primary rotating seats (4) are rotatably connected with an adjusting inclined rod (5), and the top ends of the two adjusting inclined rods (5) are rotatably connected with a secondary rotating seat (6). An upper bracket (7) is fixedly installed above the two secondary rotating seats (6). The lower surfaces of the two upper brackets (7) are respectively in sliding contact with the two lower trays (3). The upper surfaces of the two upper brackets (7) are fixedly installed with symmetrically distributed bearing seats (8), and a rotating shaft (9) is rotatably installed between the two bearing seats (8). A test cylinder (10) is fixedly installed in the middle of the rotating shaft (9).

2. A self-balancing nuclear magnetic cold head test stand according to claim 1, characterized in that: A flange wheel (11) is fixedly mounted on one end of the rotating shaft (9), and four groups of positioning holes (12) are formed on the outer surface of the flange wheel (11).

3. A self-balancing nuclear magnetic cold head test stand according to claim 2, characterized in that: A positioning plate (13) is fixedly mounted on the outer wall of the upper bracket (7) on one side close to the flange wheel (11), and a positioning pin (14) is movably inserted into the positioning plate (13).

4. The self-balancing nuclear magnetic cold head test stand according to claim 1, characterized in that: Moving wheels (15) are fixedly mounted at the four corners of the lower surface of the base frame (1) via fixing bolts.

5. The self-balancing nuclear magnetic cold head test stand according to claim 1, characterized in that: The telescopic bracket (2) comprises a supporting frame and a telescopic frame, the telescopic frame is inserted into the supporting frame, the telescopic frame and the supporting frame are movably connected, a plurality of threaded holes are provided on the supporting frame, and corresponding threaded pins are arranged in the threaded holes.

6. The self-balancing nuclear magnetic cold head test stand according to claim 1, characterized in that: The lower tray (3) adopts a "concave" type structural design.

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