Electromagnet attraction measuring device

Abstract

The invention relates to the technical field of measurement, and provides an electromagnet attraction measuring device which comprises an armature, a slotted liquid nitrogen cylinder, a guide rod, a force measuring mechanism, a guide assembly and an end cover. A through hole is formed in the bottom of the slotted liquid nitrogen cylinder, a guide assembly is arranged above the through hole, the guide assembly is arranged at the bottom of the interior of the slotted liquid nitrogen cylinder, a containing space is formed in the slotted liquid nitrogen cylinder, and liquid nitrogen is contained in the containing space; the guide assembly is provided with a tested electromagnet, the tested electromagnet is soaked in liquid nitrogen, the end cover is plugged at the bottom of the through hole, so that a guide space is formed between the through hole and the guide assembly, and the armature is arranged in the guide space. The device is high in measurement precision, can realize suction measurement under any required displacement, is good in sealing, can complete a low-temperature suction test, guarantees the safety of the test, and is simple and safe in measurement process.

Description

Technical Field

[0001] The present invention relates to the field of measurement technology, in particular to an electromagnet suction force measuring device. Background Art

[0002] The suction force of an electromagnet is its core performance. Newly developed electromagnets need to be tested for their performance in low-temperature environments and need to be accurately measured before use.

[0003] Patent document CN203376465U discloses an electromagnet suction force measuring device, including a fixing frame for fixing the electromagnet to be tested and a traction measuring mechanism for applying a separation force to overcome the electromagnetic suction force to the iron block adsorbed on the electromagnet to be tested. Its working process is: power is turned on to make the electromagnet adsorb the iron block, the iron block pulls the spring downward, and the position L1 of the test adjustment rod is recorded. The spring is pulled upward by rotating the adjustment rod until the separation force applied by the spring to the iron block overcomes the suction force of the electromagnet to be tested and causes the iron block to separate from the electromagnet to be tested. The position L2 of the adjustment rod at this time is recorded, and 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 the deformation amount ΔL is measured on the spring dynamometer. The spring force F is the suction value of the electromagnet to be tested.

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

[0005] In view of the defects in the prior art, an object of the present invention is to provide an electromagnet suction force measuring device.

[0006] According to the present invention, an electromagnet suction force measuring device includes an armature, a slotted liquid nitrogen cylinder, a guide rod, a force measuring mechanism, a guide assembly and an end cover; A through hole is provided at the bottom of the slotted liquid nitrogen cylinder, a guide assembly is provided above the through hole, the guide assembly is arranged at the bottom of the slotted liquid nitrogen cylinder, a containing space is formed inside the slotted liquid nitrogen cylinder, and liquid nitrogen is contained in the containing space; The guide assembly is provided with an electromagnet to be tested and is immersed in liquid nitrogen, the end cover is sealed at the bottom of the through hole so that a guide space is formed between the through hole and the guide assembly, the armature is arranged in the guide space, the upper end of the guide rod is fixedly connected to the armature, and the lower end of the guide rod is located below the end cover; The armature is affected by the magnetic field of the measured electromagnet coil and can be attracted to the bottom surface of the shell of the slotted liquid nitrogen cylinder. The force measuring mechanism is used to measure the suction force exerted on the guide rod along the axial direction of the measured electromagnet.

[0007] Preferably, an adjustment gasket is provided between the end cover and the slotted liquid nitrogen cylinder, and the end cover cooperates with the adjustment gasket to adjust the movement stroke of the armature.

[0008] Preferably, the thickness of the adjusting gasket is provided with a plurality of specifications, and the thickness precision is less than or equal to 0.02 mm.

[0009] Preferably, the guide rod and the armature are connected via threads and the guide rod and the armature can slide along the guide space, and the adjustment gasket passes through the upper end of the guide rod and is located below the armature.

[0010] Preferably, the end cover matches the bottom thread of the slotted liquid nitrogen cylinder, and the adjustment gasket is placed in the through hole of the slotted liquid nitrogen cylinder to adjust the stroke.

[0011] Preferably, the guide assembly comprises an electromagnet guide cylinder and a fluoroplastic gasket, and the electromagnet to be tested is arranged on the electromagnet guide cylinder; The slotted liquid nitrogen cylinder is provided with a mounting groove and an annular groove, the electromagnet guide cylinder is installed in the mounting groove through a connector and the edge of the electromagnet guide cylinder can be matched and assembled into the annular groove, and the fluoroplastic gasket is arranged between the electromagnet guide cylinder and the slotted liquid nitrogen cylinder.

[0012] Preferably, the guide assembly comprises an electromagnet to be measured and a fluoroplastic gasket, and the electromagnet to be measured is a cylindrical structure; The slotted liquid nitrogen cylinder is provided with a mounting groove and an annular groove, the electromagnet to be measured is installed in the mounting groove through a connector and the edge of the electromagnet to be measured can be matched and assembled into the annular groove, and the fluoroplastic gasket is arranged between the electromagnet to be measured and the slotted liquid nitrogen cylinder.

[0013] Preferably, a hook is provided at the lower end of the guide rod, and the force measuring mechanism performs measurement by hanging a standard weight on the hook of the guide rod.

[0014] Preferably, the guide rod is provided with a scale, and the scale matches the suction force of the measured electromagnet on the armature.

[0015] Preferably, it also includes a power supply mechanism, which is used to supply power to the power supply and the coil of the electromagnet under test, and the power supply mechanism uses a low-temperature resistant cable to supply power to the coil through an electrical connector.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The invention adopts a customized liquid nitrogen cylinder and a fluoroplastic 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 uses the weight of the hanging weight to measure the suction value, with high measurement accuracy; the suction measurement under any required displacement can be realized, the customized liquid nitrogen cylinder and the low-temperature electromagnet structure are perfectly matched and well sealed, which can not only complete the low-temperature suction test, but also ensure the safety of the test, and the measurement process is simple and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 2 It is a schematic diagram of the structure of the through hole, the mounting groove, and the annular groove; Figure 3 Schematic diagram of the structure of the guide rod.

[0018] The figure shows: Armature 1 Slotted liquid nitrogen cylinder 2 Guide rod 3 End cap 4 Adjusting shim 5 Electromagnet under test 6 Fluoroplastic gasket 7 Screw 21 Annular groove 22 Through hole 23 Mounting slot 24 DETAILED DESCRIPTION The present invention is 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 are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0019] Embodiment 1: In order to solve the problems of cumbersome measurement process, inaccurate measurement, and measurement failure to meet the specified air gap requirements of the existing electromagnet suction force measuring device under low temperature, the present invention provides an electromagnet suction force measuring device, comprising an armature 1, a slotted liquid nitrogen cylinder 2, a guide rod 3, a force measuring mechanism, a power-on mechanism, an end cover 4, and an adjusting gasket 5. The bottom of the interior of the slotted liquid nitrogen cylinder 2 is provided with a guide assembly, the bottom of the slotted liquid nitrogen cylinder 2 is provided with a through hole 23, the through hole 23 is located below the guide assembly, the interior of the slotted liquid nitrogen cylinder 2 is filled with liquid nitrogen, the guide assembly comprises a measured electromagnet 6, the measured electromagnet 6 is immersed in liquid nitrogen, the measured electromagnet 6 is preferably a cylindrical structure, the measured electromagnet 6 is detachably fixed on the slotted liquid nitrogen cylinder 2, the end cover 4 is blocked at the bottom of the through hole 23 so that the through hole 23 and the lower space of the measured electromagnet 6 form a guide space, the armature 1 is arranged in the guide space, and the end cover 4 is detachably mounted on the slotted liquid nitrogen cylinder 2 to ensure that the armature 1 does not slide out of the guide space.

[0020] 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 is connected to the armature 1 through a matching tooling, and can slide along the axial direction of the electromagnet 6 to be measured. The slotted liquid nitrogen cylinder 2 is used to be detachably connected to the electromagnet 6 to be measured, so that the electromagnet 6 to be measured is immersed in liquid nitrogen as a whole. The guide rod 3 and the armature 1 are preferably connected by threads, and the guide rod 3 and the armature 1 can slide along the axial direction of the electromagnet 6 to be measured as a whole.

[0021] like Figure 2 As 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 electromagnet 6 to be measured is installed on the mounting groove 24 through a connecting piece, and the edge of the electromagnet 6 to be measured can just match and be installed in the annular groove 22. The connecting piece is preferably a screw 21, and the electromagnet 6 to be measured is fixed by screwing the screw 21 on the mounting groove 24. It should be noted that any fixing method that replaces the screw 21 is within the protection scope of the present invention.

[0022] Furthermore, the guide assembly also includes a fluoroplastic gasket 7. By placing the fluoroplastic gasket 7 in the annular groove 22, sealing between the electromagnet 6 to be tested and the slotted liquid nitrogen cylinder 2 can be achieved. The sealing of the slotted liquid nitrogen cylinder 2 is achieved by using the fluoroplastic gasket 7.

[0023] like Figure 1 As shown, an adjustment gasket 5 is provided between the end cap 4 and the slotted liquid nitrogen cylinder 2, and the end cap 4 and the adjustment gasket 5 can adjust the movement stroke of the armature 1. The thickness of the adjustment gasket 5 is provided with multiple specifications, and the thickness precision is preferably less than or equal to 0.02mm. The end cap 4 and the adjustment gasket 5 are used to adjust the stroke of the armature 1, the end cap 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.

[0024] The power supply mechanism is used to supply power to the power source and the coil of the electromagnet 6 to be tested. The power supply mechanism uses a low-temperature resistant cable to supply power to the coil through an electrical connector. The armature 1 can be attracted to the bottom surface of the electromagnet 6 to be tested under the influence of the magnetic field of the coil. 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 tested. The force measuring mechanism is preferably a method of suspending a standard weight on the guide rod 3 for measurement.

[0025] Specifically, a hook is provided at one end of the guide rod 3 for hanging a force measuring mechanism, namely, a standard weight and a tray. The weight of the weight pulls the guide rod 3 to displace the armature 1. When the armature 1 can just absorb the weight, the weight of the weight, the guide rod 3 and the tray is the suction force of the electromagnet. In addition, a scale is provided on the guide rod 3 to movably match the suction force of the electromagnet 6 to the armature 1.

[0026] In the present invention, the slotted liquid nitrogen cylinder 2 is connected to the electromagnet 6 to be measured through the groove and the screw 21, the guide rod 3 is connected to the armature 1 through thread matching, and slides along the axial direction of the electromagnet 6 to be measured, the adjustment gasket 5 is used to measure the displacement of the armature 1, and the guide rod 3 is used to hang the weight to measure the axial suction force of the electromagnet 6 to be measured.

[0027] like Figure 3 As shown, the upper end of the guide rod 3 is provided with a thread connected to the armature 1, and the lower end is a hook style, which is used to hang the standard weight. After the electromagnet 6 to be tested is energized, the armature 1 will drive the guide rod 3 to axially displace, and the weight is read as the suction force by continuously adding weights until it is just sucked up, and the error value is basically 0.1N.

[0028] Embodiment 2: The present embodiment is different from the first embodiment in that the guide assembly comprises an electromagnet guide cylinder and a fluoroplastic gasket 7, and the electromagnet 6 to be tested is arranged on the electromagnet guide cylinder.

[0029] 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 connector. The edge of the electromagnet guide cylinder can be matched and assembled into the annular groove 22. The fluoroplastic gasket 7 is arranged between the electromagnet guide cylinder and the slotted liquid nitrogen cylinder 2.

[0030] 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 guide space, the electromagnet guide cylinder is installed on the mounting groove 24 through a connector, and the edge of the electromagnet guide cylinder can be matched and assembled into the annular groove 22. The sealing between the electromagnet guide cylinder and the slotted liquid nitrogen cylinder 2 can be achieved by placing a fluoroplastic gasket 7 in the annular groove 22, and the sealing of the slotted liquid nitrogen cylinder 2 is achieved by using the fluoroplastic gasket 7.

[0031] Embodiment 3: The present embodiment is different from the first embodiment in that it further comprises a fixture, and the electromagnet 6 to be tested is detachably mounted on the slotted liquid nitrogen cylinder 2 through the fixture.

[0032] The working principle of the present invention is as follows: Fix the electromagnet 6 to be tested on the slotted liquid nitrogen cylinder 2 with screws 21, and place a fluoroplastic gasket 7 in the annular groove 22 to seal and prevent liquid nitrogen leakage. Put the armature 1 into the electromagnet 6 to be tested 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 the adjustment gasket 5. After the stroke adjustment is completed, tighten the threads of the end cover 4 and the through hole 23, pass the guide rod 3 through the through hole of the end cover 4 and connect it with the thread of the internal armature 1. At this time, place a weight at the bottom of the guide rod 3, add liquid nitrogen to the slotted liquid nitrogen cylinder 2, and power on the electromagnet 6 to be tested after standing for 10 minutes. The armature 1 is then tested. Figure 1 The armature 1 is attracted by the upward suction force. Then the power is turned off and the above operation is repeated until the armature 1 is no longer attracted after adding a weight of 100g. When no weight is added, the armature 1 can move continuously for more than 5 times. At this time, the weight of the weight is the suction force of the electromagnet 6 to be measured, and the scale of the guide rod 3 can also confirm the gap again.

[0033] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] The above describes the specific embodiments of the present invention. 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. In the absence of 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 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.

2. The electromagnet suction force measuring device according to claim 1, 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).

3. The electromagnet suction force measuring device according to claim 2, 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.

4. The electromagnet suction force measuring device according to claim 2, 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).

5. The electromagnet suction force measuring device according to claim 2, 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.

6. The electromagnet suction force measuring device according to claim 1, characterized in that: 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).

7. The electromagnet suction force measuring device according to claim 1, characterized in that: The guide assembly comprises an electromagnet to be tested (6) and a fluoroplastic gasket (7), wherein 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 (6) to be measured is installed in the mounting groove (24) via a connecting piece and the edge of the electromagnet (6) to be measured can be matched and assembled in the annular groove (22); the fluoroplastic gasket (7) is arranged between the electromagnet (6) to be measured and the slotted liquid nitrogen cylinder (2).

8. The electromagnet suction force measuring device according to claim 1, 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).

9. The electromagnet suction force measuring device according to claim 1, 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).

10. The electromagnet suction force measuring device according to claim 1, 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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