Electromagnet Suction Force Measuring Device

Abstract

The present invention relates to the field of measurement technology, and provides an electromagnet suction force measurement device, which includes an armature, a slotted liquid nitrogen cylinder, a guide rod, a force measuring mechanism, a guiding assembly and an end cover; a through hole is provided at the bottom of the slotted liquid nitrogen cylinder, a guiding assembly is provided above the through hole, the guiding assembly is arranged at the bottom inside the slotted liquid nitrogen cylinder, a loading space is formed inside the slotted liquid nitrogen cylinder, and liquid nitrogen is contained in the loading space; a to-be-tested electromagnet is arranged on the guiding assembly and the to-be-tested electromagnet is immersed in the liquid nitrogen, the end cover seals the bottom of the through hole so that a guiding space is formed between the through hole and the guiding assembly, and the armature is arranged in the guiding space. The measurement of the present invention has high precision, can realize the suction force measurement at any required displacement, has good sealing, can not only complete the low-temperature suction force test, but also ensure the safety of the test, and the measurement process is simple and safe.

Description

Technical Field

[0001] The present invention relates to the technical field of measurement, and more particularly, to an electromagnet suction force measuring device. Background Art

[0002] The magnitude of the electromagnet suction force is the core performance of the electromagnet. For newly developed electromagnets, it is necessary to detect their performance in a low-temperature environment and accurately measure them before use.

[0003] Patent document CN203376465U discloses an electromagnet suction force measuring device, which includes a fixing frame for fixing the electromagnet to be measured and a traction measuring mechanism for applying a separating force to overcome the electromagnetic suction force to the iron block adsorbed on the electromagnet to be measured. Its working process is as follows: The electromagnet is energized to adsorb the iron block, and the iron block pulls the spring downward. Record the position L1 of the test adjusting rod. By rotating the adjusting rod to stretch the spring upward until the separating force applied by the spring to the iron block overcomes the suction force of the electromagnet to be measured and causes the iron block to separate from the electromagnet to be measured, record the position L2 of the adjusting rod at this time. The distance between the two positions is the deformation amount ΔL of the spring. Then, the spring is removed, and the spring force F when the spring produces a deformation amount of ΔL is measured on a spring dynamometer. This spring force F is the suction force value of the electromagnet to be measured.

[0004] The above-mentioned electromagnet suction force measuring device uses the method of recording the spring deformation amount during separation, removing the spring after separation, and then measuring the spring force that produces the same deformation amount on a spring dynamometer again. The process is relatively cumbersome; at the same time, when measuring the spring force that produces the same deformation amount again, due to the fact that the spring stiffness is not completely linear, measurement errors are bound to occur, resulting in inaccurate measurement results; in addition, the electromagnet suction force value is related to the air gap of the armature. The above device only measures the suction force value at room temperature and cannot measure the suction force value at a specified air gap, with a large deviation in suction force testing and unable to meet the requirements for measuring the low-temperature suction force of the electromagnet. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide an electromagnet suction force measuring device.

[0006] According to an electromagnet suction force measuring device provided by the present invention, it includes an armature, a slotted liquid nitrogen cylinder, a guide rod, a force measuring mechanism, a guide assembly, and an end cap;

[0007] A through hole is provided at the bottom of the slotted liquid nitrogen cylinder, and a guide assembly is provided above the through hole. The guide assembly is arranged at the bottom inside the slotted liquid nitrogen cylinder. A loading space is formed inside the slotted liquid nitrogen cylinder, and liquid nitrogen is loaded in the loading space;

[0008] The tested electromagnet is arranged on the guiding assembly and the tested electromagnet is immersed in liquid nitrogen. The end cover seals the bottom of the through hole so that a guiding space is formed between the through hole and the guiding assembly. The armature is arranged in the guiding space. The upper end of the guiding rod is fixedly connected to the armature, and the lower end of the guiding rod is located below the end cover;

[0009] The armature can be attracted to the bottom surface of the shell of the slotted liquid nitrogen cylinder under the influence of the magnetic field of the tested electromagnet coil, and the force measuring mechanism is used to measure the suction force received by the guiding rod along the axis of the tested electromagnet.

[0010] Preferably, an adjusting gasket is arranged between the end cover and the slotted liquid nitrogen cylinder, and the cooperation between the end cover and the adjusting gasket can adjust the movement stroke of the armature.

[0011] Preferably, the thickness of the adjusting gasket has multiple specifications, and the precision of the thickness is less than or equal to 0.02 mm.

[0012] Preferably, the guiding rod is threadedly connected to the armature and the guiding rod and the armature can slide along the guiding space. The adjusting gasket penetrates through the upper end of the guiding rod and is located below the armature.

[0013] Preferably, the end cover matches the bottom thread of the slotted liquid nitrogen cylinder, and the adjusting gasket is placed in the through hole of the slotted liquid nitrogen cylinder to adjust the stroke.

[0014] Preferably, the guiding assembly includes an electromagnet guiding cylinder and a fluoroplastics gasket, and the tested electromagnet is arranged on the electromagnet guiding cylinder;

[0015] An installation groove and an annular groove are arranged in the slotted liquid nitrogen cylinder. The electromagnet guiding cylinder is installed in the installation groove through a connecting piece and the edge of the electromagnet guiding cylinder can be fitted into the annular groove. The fluoroplastics gasket is arranged between the electromagnet guiding cylinder and the slotted liquid nitrogen cylinder.

[0016] Preferably, the guiding assembly includes the tested electromagnet and a fluoroplastics gasket, and the tested electromagnet is of a cylindrical structure;

[0017] An installation groove and an annular groove are arranged in the slotted liquid nitrogen cylinder. The tested electromagnet is installed in the installation groove through a connecting piece and the edge of the tested electromagnet can be fitted into the annular groove. The fluoroplastics gasket is arranged between the tested electromagnet and the slotted liquid nitrogen cylinder.

[0018] Preferably, a hook is arranged at the lower end of the guiding rod, and the force measuring mechanism measures by hanging a standard weight on the hook of the guiding rod.

[0019] Preferably, a scale is provided on the guide rod, and the scale matches the suction force of the measured electromagnet on the armature.

[0020] Preferably, a power supply mechanism is further included. The power supply mechanism is used to supply power to the power supply and the coil of the measured electromagnet. The power supply mechanism uses a low-temperature-resistant cable to supply power to the coil through an electrical connector.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention uses a customized liquid nitrogen cylinder and fluoroplastics ring to ensure that the electromagnet is immersed in liquid nitrogen without leakage, uses an adjusting gasket to control the displacement of the electromagnet, uses the thickness of the gasket to limit the stroke of the electromagnet, and measures the suction force value with the weight of the suspended weights, with high measurement accuracy; it can achieve the suction force measurement at any required displacement. The customized liquid nitrogen cylinder and the low-temperature electromagnet structure fit perfectly, with good sealing, which can not only complete the low-temperature suction force test but also ensure the safety of the test. The measurement process is simple and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objectives, and advantages of the present invention will become more apparent:

[0024] Figure 1 It is a schematic cross-sectional structure diagram of the present invention;

[0025] Figure 2 It is a schematic structure diagram of the through hole, mounting groove, and annular groove;

[0026] Figure 3 It is a schematic structure diagram of the guide rod.

[0027] As shown in the figure:

[0028] Armature 1

[0029] Slotted liquid nitrogen cylinder 2

[0030] Guide rod 3

[0031] End cap 4

[0032] Adjusting gasket 5

[0033] Measured electromagnet 6

[0034] Fluoroplastics washer 7

[0035] Screw 21

[0036] Annular groove 22

[0037] Through hole 23

[0038] Mounting groove 24 DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all fall within the protection scope of the present invention.

[0040] Embodiment 1:

[0041] To solve the problems of the existing electromagnet suction force measuring device, such as cumbersome measurement process, inaccurate measurement, and inability to meet the specified air gap requirements at low temperatures, the present invention provides an electromagnet suction force measuring device, which includes an armature 1, a slotted liquid nitrogen cylinder 2, a guide rod 3, a force measuring mechanism, a power supply mechanism, an end cover 4, and an adjusting gasket 5. A guide assembly is provided at the bottom inside the slotted liquid nitrogen cylinder 2. A through hole 23 is provided at the bottom of the slotted liquid nitrogen cylinder 2, and the through hole 23 is located below the guide assembly. Liquid nitrogen is contained inside the slotted liquid nitrogen cylinder 2. The guide assembly includes a measured electromagnet 6, and the measured electromagnet 6 is immersed in liquid nitrogen. The measured electromagnet 6 is preferably of a cylindrical structure and is detachably fixed to the slotted liquid nitrogen cylinder 2. The end cover 4 seals the bottom of the through hole 23, so that the through hole 23 and the lower space of the measured electromagnet 6 form a guiding space. The armature 1 is arranged in the guiding space. The end cover 4 is detachably installed on the slotted liquid nitrogen cylinder 2 to ensure that the armature 1 does not slide out of the guiding space.

[0042] The upper end of the guide rod 3 is fixedly connected to the armature 1, and the lower end of the guide rod 3 is located below the end cover 4. Specifically, the guide rod 3 and the armature 1 are connected through a matching tooling and can slide along the axial direction of the measured electromagnet 6. The slotted liquid nitrogen cylinder 2 is used to be detachably connected to the measured electromagnet 6, so that the measured electromagnet 6 is integrally immersed in liquid nitrogen. The guide rod 3 and the armature 1 are preferably connected by threads, and the guide rod 3 and the armature 1 as a whole can slide along the axial direction of the measured electromagnet 6.

[0043] As Figure 2 shown, the slotted liquid nitrogen cylinder 2 is also provided with an annular groove 22 arranged circumferentially along the through hole 23 and six mounting grooves 24 arranged circumferentially along the annular groove 22. The measured electromagnet 6 is installed on the mounting grooves 24 through a connecting piece, and the edge of the measured electromagnet 6 can just be fitted into the annular groove 22. Among them, the connecting piece is preferably a screw 21, and the measured electromagnet 6 is fixed by screwing the screw 21 into the mounting groove 24. It should be noted that any fixing method replacing the screw 21 is within the protection scope of the present invention.

[0044] Furthermore, the guiding component further includes a fluoroplastics washer 7. By placing the fluoroplastics washer 7 in the annular groove 22, the sealing between the measured electromagnet 6 and the slotted liquid nitrogen cylinder 2 can be achieved, and the sealing of the slotted liquid nitrogen cylinder 2 is realized by using the fluoroplastics washer 7.

[0045] As Figure 1 shown, an adjusting gasket 5 is arranged between the end cover 4 and the slotted liquid nitrogen cylinder 2. The end cover 4 and the adjusting gasket 5 together can adjust the moving stroke of the armature 1. The thickness of the adjusting gasket 5 has multiple specifications, and the precision of the thickness is preferably less than or equal to 0.02 mm. The end cover 4 and the adjusting gasket 5 are used to adjust the stroke of the armature 1. The end cover 4 matches the bottom thread of the slotted liquid nitrogen cylinder 2, and the adjusting gasket 5 is placed in the through hole 23 of the slotted liquid nitrogen cylinder 2 to adjust the stroke.

[0046] The power supply mechanism is used to supply power to the power supply and the coil of the measured electromagnet 6. The power supply mechanism uses a cryogenic-resistant cable to supply power to the coil through an electrical connector. The armature 1 can be attracted to the bottom surface of the measured electromagnet 6 under the influence of the coil magnetic field, and the force measuring mechanism is used to measure the suction force received by the guide rod 3 along the axial direction of the measured electromagnet 6. The force measuring mechanism is preferably to measure by the method of hanging standard weights on the guide rod 3.

[0047] Specifically, one end of the guide rod 3 is provided with a hook for hanging the force measuring mechanism, and the force measuring mechanism is the standard weight and the tray. The weight of the weight pulls the guide rod 3 to cause the armature 1 to displace. When the armature 1 can just lift the weight, the weight of the weight, the guide rod 3 and the tray at this time is the suction force of the electromagnet. In addition, a scale is arranged on the guide rod 3 to movably match the suction force of the measured electromagnet 6 on the armature 1.

[0048] In the present invention, the slotted liquid nitrogen cylinder 2 is connected to the measured electromagnet 6 through the groove and the screw 21. The guide rod 3 and the armature 1 are connected by thread matching and slide along the axial direction of the measured electromagnet 6. The adjusting gasket 5 is used to measure and adjust the displacement of the armature 1, and the guide rod 3 is used to hang weights to measure the suction force received by the measured electromagnet 6 along the axial direction.

[0049] As Figure 3 shown, the upper end of the guide rod 3 is provided with a thread to connect with the armature 1, and the lower end is in the shape of a hook for hanging the standard weight. After the measured electromagnet 6 is powered on, the armature 1 will drive the guide rod 3 to have an axial displacement. By continuously adding weights until it can just be lifted, reading the weight of the weight is the suction force, and the error value is basically within 0.1 N.

[0050] Embodiment 2:

[0051] The difference between this embodiment and Embodiment 1 is that the guiding component includes an electromagnet guiding cylinder and a fluoroplastics washer 7, and the measured electromagnet 6 is arranged on the electromagnet guiding cylinder.

[0052] The slotted liquid nitrogen cylinder 2 is provided with a mounting groove 24 and an annular groove 22. The electromagnet guide cylinder is installed in the mounting groove 24 through a connecting piece. The edge of the electromagnet guide cylinder can just be fitted into the annular groove 22. The fluoroplast gasket 7 is arranged between the electromagnet guide cylinder and the slotted liquid nitrogen cylinder 2.

[0053] The electromagnet guide cylinder is detachably fixed on the slotted liquid nitrogen cylinder 2. The through hole 23 and the lower space of the electromagnet guide cylinder form a guiding space. The electromagnet guide cylinder is installed on the mounting groove 24 through a connecting piece, and the edge of the electromagnet guide cylinder can just be fitted into the annular groove 22. Sealing between the electromagnet guide cylinder and the slotted liquid nitrogen cylinder 2 can be realized by placing the fluoroplast gasket 7 in the annular groove 22, and the sealing of the slotted liquid nitrogen cylinder 2 can be realized by using the fluoroplast gasket 7.

[0054] Embodiment 3:

[0055] The difference between this embodiment and Embodiment 1 is that it further includes a fixture. The electromagnet 6 to be measured is detachably installed on the slotted liquid nitrogen cylinder 2 through the fixture.

[0056] The working principle of the present invention is as follows:

[0057] Fix the electromagnet 6 to be measured on the slotted liquid nitrogen cylinder 2 through the screw 21. Place the fluoroplast gasket 7 at the annular groove 22 to play a sealing role and prevent liquid nitrogen leakage. Put the armature 1 into the electromagnet 6 to be measured through the through hole 23, and measure the distance from the armature 1 to the top of the through hole 23. Adjust the stroke of the armature 1 by adding shims 5. After the stroke adjustment is completed, tighten the end cap 4 with the thread at the through hole 23. Connect the guide rod 3 through the through hole of the end cap 4 to the thread of the internal armature 1. At this time, place weights at the bottom of the guide rod 3, add liquid nitrogen to the slotted liquid nitrogen cylinder 2, and after standing for 10 minutes, energize the electromagnet 6 to be measured, and the armature 1 will be Figure 1 suction force in the upward direction, and the armature 1 is attracted. Then cut off the power and repeat the above operation until the armature 1 no longer attracts after adding another 100 g of weights, and the armature 1 can continuously act more than 5 times without adding weights. At this time, the weight of the weights is the suction force of the electromagnet 6 to be measured, and the scale of the guide rod 3 can also reconfirm the gap.

[0058] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0059] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. An electromagnet suction force measuring device, characterized in that: It comprises an armature (1), a slotted liquid nitrogen cylinder (2), a guide rod (3), a force measuring mechanism, a guide assembly and an end cover (4); A through hole (23) is provided at the bottom of the slotted liquid nitrogen cylinder (2), a guide assembly is provided above the through hole (23), the guide assembly is arranged at the bottom of the interior of the slotted liquid nitrogen cylinder (2), a containing space is formed inside the slotted liquid nitrogen cylinder (2), and liquid nitrogen is contained in the containing space; The guide assembly is provided with a measured electromagnet (6) and the measured electromagnet (6) is immersed in liquid nitrogen, the end cover (4) blocks the bottom of the through hole (23) so that a guide space is formed between the through hole (23) and the guide assembly, the armature (1) is arranged in the guide space, the upper end of the guide rod (3) is fixedly connected to the armature (1), and the lower end of the guide rod (3) is located below the end cover (4); The armature (1) is affected by the magnetic field of the coil of the electromagnet (6) to be measured and can be attracted to the bottom surface of the shell of the slotted liquid nitrogen cylinder (2), and the force measuring mechanism is used to measure the suction force exerted on the guide rod (3) along the axial direction of the electromagnet (6) to be measured; The guide assembly comprises an electromagnet guide cylinder and a fluoroplastic gasket (7), and the electromagnet to be tested (6) is arranged on the electromagnet guide cylinder; The slotted liquid nitrogen cylinder (2) is provided with a mounting groove (24) and an annular groove (22); the electromagnet guide cylinder is installed in the mounting groove (24) via a connecting piece and the edge of the electromagnet guide cylinder can be matched and assembled in the annular groove (22); the fluoroplastic gasket (7) is arranged between the electromagnet guide cylinder and the slotted liquid nitrogen cylinder (2).

2. An electromagnet suction force measuring device, characterized in that: It comprises an armature (1), a slotted liquid nitrogen cylinder (2), a guide rod (3), a force measuring mechanism, a guide assembly and an end cover (4); A through hole (23) is provided at the bottom of the slotted liquid nitrogen cylinder (2), a guide assembly is provided above the through hole (23), the guide assembly is arranged at the bottom of the interior of the slotted liquid nitrogen cylinder (2), a containing space is formed inside the slotted liquid nitrogen cylinder (2), and liquid nitrogen is contained in the containing space; The guide assembly comprises an electromagnet to be tested (6) and a fluoroplastic gasket (7); the electromagnet to be tested (6) is a cylindrical structure; the slotted liquid nitrogen cylinder (2) is provided with a mounting groove (24) and an annular groove (22); the electromagnet to be tested (6) is installed in the mounting groove (24) via a connecting piece and the edge of the electromagnet to be tested (6) can be matched and assembled in the annular groove (22); the fluoroplastic gasket (7) is provided between the electromagnet to be tested (6) and the slotted liquid nitrogen cylinder (2); The electromagnet (6) to be tested is immersed in liquid nitrogen, the end cover (4) blocks the bottom of the through hole (23) so that a guide space is formed between the through hole (23) and the guide assembly, the armature (1) is arranged in the guide space, the upper end of the guide rod (3) is fixedly connected to the armature (1), and the lower end of the guide rod (3) is located below the end cover (4); The armature (1) is influenced by the magnetic field of the coil of the electromagnet (6) to be measured and can be attracted to the bottom surface of the shell of the slotted liquid nitrogen cylinder (2), and the force measuring mechanism is used to measure the suction force exerted on the guide rod (3) along the axial direction of the electromagnet (6) to be measured.

3. The electromagnet suction force measuring device according to claim 1 or 2, characterized in that: An adjustment gasket (5) is provided between the end cover (4) and the slotted liquid nitrogen cylinder (2); the end cover (4) and the adjustment gasket (5) cooperate to adjust the movement stroke of the armature (1).

4. The electromagnet suction force measuring device according to claim 3, characterized in that: The thickness of the adjusting gasket (5) is provided with a plurality of specifications, and the thickness precision is less than or equal to 0.02 mm.

5. The electromagnet suction force measuring device according to claim 3, characterized in that: The guide rod (3) and the armature (1) are connected via threads and the guide rod (3) and the armature (1) are capable of sliding along the guide space; the adjustment gasket (5) passes through the upper end of the guide rod (3) and is located below the armature (1).

6. The electromagnet suction force measuring device according to claim 3, characterized in that: The end cover (4) matches the bottom thread of the slotted liquid nitrogen cylinder (2), and the adjustment gasket (5) is placed in the through hole (23) of the slotted liquid nitrogen cylinder (2) to adjust the stroke.

7. The electromagnet suction force measuring device according to claim 1 or 2, characterized in that: A hook is provided at the lower end of the guide rod (3), and the force measuring mechanism performs measurement by hanging a standard weight on the hook of the guide rod (3).

8. The electromagnet suction force measuring device according to claim 1 or 2, characterized in that: The guide rod (3) is provided with a scale, and the scale matches the suction force of the measured electromagnet (6) on the armature (1).

9. The electromagnet suction force measuring device according to claim 1 or 2, characterized in that: It also includes a power supply mechanism, which is used to supply power to the power source and the coil of the electromagnet (6) to be tested, and the power supply mechanism uses a low-temperature resistant cable to supply power to the coil through an electrical connector.

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