Cold head testing device

Abstract

The utility model discloses a cold head testing device, and relates to the technical field of magnetic resonance cold head detection, the cold head testing device comprises a mounting rack, a lifting rope, a lifting frame, a target and a laser emitter, the lifting rope extends along the vertical direction, and one end of the lifting rope is fixedly connected with the mounting rack; the hanging bracket is fixedly connected with the other end of the hanging rope, and is provided with a placing area for placing a cold head; the target is fixedly arranged on the mounting frame and corresponds to the hanging bracket in the first horizontal direction; the laser transmitter is fixedly arranged on the hanging bracket and faces the target; a good area, a maintenance area and a repair area are sequentially arranged on the side, facing the hanging bracket, of the target from inside to outside. According to the technical scheme provided by the utility model, the vibration of the cold head is converted into the change of the position of the laser on the target, and whether the vibration of the cold head meets the requirement or not is judged according to the maximum amplitude of the farthest laser drop point corresponding to the cold head during operation, so that the technical effect of simplifying the detection steps is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic resonance cold head detection, in particular to a cold head testing device. Background Art

[0002] Excessive vibration of a magnetic resonance cold head can lead to a range of problems, including cold head wear, reduced cooling efficiency, reduced equipment performance, and increased system quench risk. Excessive cold head vibration is caused by deformation of the mechanical structure and wear of moving parts.

[0003] It is normal for the cold head to vibrate during operation. However, in order to determine whether the vibration amplitude of the cold head meets the requirements, the various parts of the cold head are disassembled and tested separately. The deformation and wear are then tested to determine whether the vibration amplitude meets the requirements. This results in many testing steps and a long testing time. Utility Model Content

[0004] The main purpose of the utility model is to provide a cold head testing device, aiming to solve the problem that the existing steps for detecting whether the vibration amplitude of the cold head meets the requirements are complicated and the detection time is long.

[0005] To achieve the above-mentioned purpose, the cold head testing device proposed in the present invention includes: a mounting frame, a hanging rope, a hanger, a target and a laser emitter, the hanging rope extends in a vertical direction, and one end is fixedly connected to the mounting frame; the hanger is fixedly connected to the other end of the hanging rope, and has a placement area for placing the cold head; the target is fixedly arranged on the mounting frame and is arranged corresponding to the hanger in the first horizontal direction; the laser emitter is fixedly arranged on the hanger and is arranged toward the target; wherein, the target is provided with a good area, a maintenance area and a repair area in sequence from the inside to the outside on the side facing the hanger.

[0006] In one embodiment, a reference point is provided at the center of the good area, and the laser light emitted by the laser emitter is directed toward the reference point.

[0007] In one embodiment, the cold head testing device further includes a fixing assembly, which is disposed on the hanger and has movable ends that move closer to or farther away from each other along the second horizontal direction, and is used to clamp and fix the cold head.

[0008] In one embodiment, the fixing assembly includes two cylinders fixedly disposed on both sides of the hanger placement area in the second horizontal direction and arranged opposite to each other.

[0009] In one embodiment, the cold head includes an electrical control box and an ejector, and is characterized in that the hanger is used to support the electrical control box, and the hanger has a through hole running through in a vertical direction, and the through hole is for the ejector to pass through; the cold head testing device also includes a resistance thermometer, and the thermometer is arranged corresponding to the through hole in the vertical direction, and is located on the side of the hanger away from the suspension rope.

[0010] In one embodiment, the cold head testing device further comprises a box body, the box body is movably provided with a mounting frame, and has a cavity opening upward, the opening and the through hole are arranged correspondingly in the upper and lower directions for the insertion of the ejector, and the resistance thermometer is fixedly provided at the bottom of the cavity.

[0011] In one embodiment, the target is detachably mounted on the mounting frame, and a plurality of targets are provided, and the good area of ​​the plurality of targets increases sequentially.

[0012] In one embodiment, a threaded hole is provided at the center of a side of the target facing away from the hanger, and the mounting bracket is provided with a screw extending along the first horizontal direction, and the screw is matched with the threaded hole.

[0013] In one embodiment, the cold head testing device further includes a sound level meter, and the sound level meter is disposed in the placement area.

[0014] In one embodiment, the cold head testing device further includes two thermometers, which are respectively arranged at the water inlet and the water outlet of the cold head.

[0015] The technical solution of the present invention converts the vibration of the cold head into a change in the position of the laser on the target, and judges whether the vibration of the cold head meets the requirements based on the maximum amplitude of the cold head during operation corresponding to the farthest laser landing point, thereby achieving the technical effect of simplifying the detection steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 This is a structural diagram of an embodiment of a cold head testing device provided by the present invention;

[0018] Figure 2 for Figure 1 Side view of the intercooler test setup.

[0019] Description of Figure Numbers:

[0020] 100. Cold head test device; 1. Mounting frame; 2. Lifting rope; 3. Hanging bracket; 4. Target; 5. Laser emitter; 6. Fixing assembly; 61. Cylinder; 7. Box; 8. Resistance thermometer; 9. Sound level meter.

[0021] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. 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 limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] Excessive vibration of a magnetic resonance cold head can lead to a range of problems, including cold head wear, reduced cooling efficiency, impacted equipment performance, and increased system quench risk. Excessive cold head vibration is caused by deformation of the mechanical structure and wear of moving parts. Vibration during cold head operation is normal, but the existing method for determining whether the vibration amplitude of the cold head meets the requirements involves disassembling each component and testing it separately. This involves measuring deformation and wear to determine whether the vibration amplitude meets the requirements, resulting in multiple testing steps and lengthy testing times.

[0026] The utility model provides a cold head testing device.

[0027] See also Figure 1 In one embodiment of the present invention, the cold head testing device 100 includes: a mounting frame 1, a hanging rope 2, a hanger 3, a target 4 and a laser emitter 5, the hanging rope 2 extends in the vertical direction, and one end is fixedly connected to the mounting frame 1; the hanger 3 is fixedly connected to the other end of the hanging rope 2, and has a placement area for placing the cold head; the target 4 is fixedly set on the mounting frame 1 and is arranged corresponding to the hanger 3 in the first horizontal direction; the laser emitter 5 is fixedly set on the hanger 3 and is arranged toward the target 4; wherein, the target 4 is provided with a good area, a maintenance area and a repair area in sequence from the inside to the outside on the side facing the hanger 3.

[0028] The technical solution of the present invention is provided with a mounting frame 1, a hanging rope 2, and a hanger 3. The hanging rope 2 connects the mounting frame 1 and the hanger 3. The hanger 3 is used to place a cold head. The cold head will vibrate when working, and the vibration of the cold head can be converted into the shaking of the hanger 3, which is convenient for observation. Therefore, the shaking amplitude of the hanger 3 needs to be converted and amplified. Specifically, a laser emitter 5 is set on the hanger 3, and the target 4 is set corresponding to the laser emitter 5. When the cold head is not working and the hanger 3 is not shaking, the laser emitted by the laser emitter 5 is irradiated at the center position of the target 4. When the cold head is working and the hanger 3 shakes, the landing point of the laser emitted by the laser emitter 5 on the target 4 will change. The greater the shaking amplitude, the farther the distance between the landing point of the laser on the target 4 and the center position of the target 4. The vibration amplitude of the cold head and the distance between the landing point of the laser on the target 4 and the center position of the target 4 are made to correspond. The central area of ​​target 4 is divided into a good zone (circular area), a maintenance zone (annular area) is set up on the periphery of the good zone, and a repair zone (annular area) is set up on the periphery of the maintenance zone. When the laser irradiation on target 4 only falls within the good zone, the vibration amplitude of the cold head is small, which has little impact on the operation of the cold head. In this case, no treatment is required for the cold head. When the laser irradiation on target 4 falls within the maintenance zone, it indicates that the internal components of the cold head have undergone a certain amount of deformation or wear. The vibration amplitude of the cold head increases during operation, but it does not affect the normal operation of the cold head. In this case, to extend the service life of the cold head or its internal components, regular maintenance is required. When the laser irradiation on target 4 falls within the repair zone, it indicates that the internal components of the cold head have undergone significant deformation or wear. The vibration amplitude of the cold head increases during operation. Not only does this reduce the cooling efficiency, affect the equipment performance, and increase the risk of system quench, but when applied to magnetic resonance imaging systems, the large vibration of the cold head may affect the stability of the magnetic field, thereby affecting the imaging quality. Therefore, the cold head needs to be repaired or replaced. This detection method can visually observe the vibration of the cold head during operation through the landing point of the laser.

[0029] When the cold head is not placed in the hanger 3, the laser is irradiated to the center of the target 4; after the cold head is placed and when the cold head is not running, the laser is also irradiated to the center of the target 4, so as to ensure the accuracy of the detection. The laser landing point may change when different types of cold heads are placed and the positions on the hanger 3 are different. In order to be able to observe the laser landing point falling on the center of the target 4, a reference point is set at the center of the target 4. When the laser landing point coincides with the reference point, it means that the cold head has been placed in the test position. At this time, the cold head can be tested and operated.

[0030] Since the vibration of the cold head will cause displacement between the cold head and the hanger 3, the cold head stops running and the laser landing point does not coincide with the reference point, which means that the test is inaccurate. Therefore, it is necessary to ensure that the hanger 3 and the cold head are fixedly connected and cannot produce relative displacement. In one embodiment, the cold head testing device 100 also includes a fixing component 6, which is arranged on the hanger 3 and has a movable end that approaches or moves away from each other along the second horizontal direction, and is used to clamp and fix the cold head. Specifically, the fixing component 6 includes two cylinders 61, which are fixedly arranged on both sides of the second horizontal direction of the hanger 3 placement area and are arranged relative to each other.

[0031] In addition, the cooling effect of the cold head is also one of the important indicators of the cold head test. In order to test the cooling effect, the cooling effect can be evaluated by measuring the temperature change of the cold head under different working conditions. For example, thermocouples and industrial resistance thermometers can be used for temperature measurement to obtain the temperature curve of the cold head under different working conditions. The cold head includes an electrical control box and an ejector. The cold head ejector plays a vital role in the refrigeration system. Its main function is to remove heat from the system through the expansion process and transfer the cold to the components that need to be cooled. The hanger 3 is used to support the electrical control box. The hanger 3 has a through hole that passes through in the vertical direction. The through hole is for the ejector to pass through. The cold head testing device 100 also includes a resistance thermometer 8. The thermometer is arranged in a vertical direction corresponding to the through hole and is located on the side of the hanger 3 away from the suspension rope 2. In order to reduce the influence of ambient temperature on the measurement in a completely open environment. The cold head testing device 100 further includes a housing 7, which is movably provided with a mounting frame 1 and has an upwardly open cavity. The opening corresponds to the through hole in the vertical direction and is provided for insertion of the ejector. The resistance thermometer 8 is fixedly mounted at the bottom of the cavity. Testing is performed in a nearly closed environment, thereby improving test accuracy.

[0032] Because different models and specifications generate different maximum vibrations during normal operation, a single target 4—a single standard—cannot be used to measure multiple cold head models. Therefore, multiple targets 4 are provided corresponding to different cold head models. The targets 4 are detachably mounted on the mounting frame 1. Multiple targets 4 are provided, and the good quality zones of the multiple targets 4 increase in size.

[0033] In order to ensure that the position of the reference point of each different target 4 is fixed when it is installed on the mounting frame 1, a threaded hole is provided in the center of each target 4 on the side away from the hanger 3, and the mounting frame 1 is provided with a screw extending along the first horizontal direction, and the screw cooperates with the threaded hole.

[0034] The noise generated during cold head operation is also an important indicator of cold head testing. The noise comes from the cold head's own vibration, as well as changes in fit due to component wear and seal failure. The cold head testing device 100 also includes a sound level meter 9, which is located within the placement area. When the maximum noise generated during operation exceeds the maximum noise generated during normal operation, it indicates that the internal components of the cold head require repair or replacement.

[0035] In order to test the cooling effect of the cold head from another perspective and ensure the accuracy of the test, the cold head testing device 100 also includes two thermometers, which are respectively used to be set at the water inlet and water outlet of the cold head. After the water inlet and water outlet of the cold head are connected to the helium compressor and then run, the cooling efficiency of the cold head can be indirectly evaluated by monitoring the helium temperature and pressure of the helium compressor, as well as the water inlet and water outlet temperatures. Changes in these parameters can reflect the working status and cooling effect of the cold head.

[0036] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cold head testing device, characterized in that: include: Mounting rack; A hanging rope extending in a vertical direction, one end of which is fixedly connected to the mounting frame; A hanger, fixedly connected to the other end of the hanging rope, having a placement area for placing the cold head; A target is fixedly mounted on the mounting frame and is arranged corresponding to the hanger in a first horizontal direction; a laser emitter, fixedly mounted on the hanger and facing the target; Wherein, the target is provided with a good area, a maintenance area and a repair area in sequence from the inside to the outside on the side facing the hanger.

2. The cold head testing device according to claim 1, wherein: A reference point is provided at the center of the good area, and the laser light emitted by the laser emitter is directed toward the reference point.

3. The cold head testing device according to claim 1, wherein: The cold head testing device further includes a fixing assembly, which is disposed on the hanger and has movable ends that approach or move away from each other along a second horizontal direction and is used to clamp and fix the cold head.

4. The cold head testing device according to claim 3, wherein: The fixing assembly includes two cylinders, which are fixedly arranged on both sides of the second horizontal direction of the hanger placement area and are arranged opposite to each other.

5. The cold head testing device according to claim 1, wherein: The cold head includes an electrical control box and an ejector. The hanger is used to support the electrical control box. The hanger has a through hole running through in the vertical direction, and the through hole is for the ejector to pass through. The cold head testing device also includes a resistance thermometer, which is arranged corresponding to the through hole in the vertical direction and is located on the side of the hanger away from the suspension rope.

6. The cold head testing device according to claim 5, wherein: The cold head testing device also includes a box body, which is movably provided with a mounting frame and has an upwardly open cavity. The opening and the through hole are arranged correspondingly in the upper and lower directions for inserting the ejector. The resistance thermometer is fixedly arranged at the bottom of the cavity.

7. The cold head testing device according to claim 1, wherein: The target is detachably mounted on the mounting frame. A plurality of targets are provided, and the good area of ​​the plurality of targets increases in sequence.

8. The cold head testing device according to claim 7, wherein: A threaded hole is provided at the center of a side of the target facing away from the hanger, and the mounting frame is provided with a screw extending along a first horizontal direction, and the screw is matched with the threaded hole.

9. The cold head testing device according to claim 1, wherein: The cold head testing device further includes a sound level meter, which is disposed in the placement area.

10. The cold head testing device according to claim 1, wherein: The cold head testing device further includes two thermometers, which are respectively arranged at the water inlet and the water outlet of the cold head.

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