Electromagnet resistance, magnetic force testing device and method

Abstract

This invention discloses an electromagnet resistance and magnetic force testing device and method, including a base, an energizing component, an electric cylinder component, a force measuring component, and a support platform; a receiving space is formed on the support platform; the energizing component includes a clamping component, a cylinder group, a first contact group, a second contact group, and a third contact group; the clamping component can clamp onto an attracting coil; the cylinder group drives the first contact group and the second contact group to electrically connect, directly obtaining the resistance value; the cylinder group also drives the first contact group and the third contact group to electrically connect, supplying power to the electromagnet; the electric cylinder component is located directly above the support platform, and the force measuring component is disposed on the output end of the electric cylinder component, coaxially arranged with the armature; the force measuring component includes a pressure sensor and a pressure sensor probe. The support platform vertically confines the electromagnet within it, ensuring the coaxiality of the armature and the pressure sensor probe; during testing, the magnetic force of the electromagnet can be obtained by pressing the armature, eliminating the influence of gravity and improving the effectiveness and accuracy of the test results.

Description

Technical Field

[0001] This invention belongs to the field of electromagnet testing technology, and in particular relates to an electromagnet resistance and magnetic force testing device and method. Background Technology

[0002] An electromagnet mainly consists of a coil frame, moving and stationary iron cores, a return spring, an attraction coil, and a shell. It converts electrical parameters into mechanical parameters and is widely used in various industrial applications, such as new energy vehicles and robots. However, the magnetic force of an electromagnet is greatly affected by the magnetic material. Measuring electrical parameters alone cannot directly reflect the mechanical properties of an electromagnet. Therefore, a direct electromagnetic force-curve analysis is needed to determine its electromagnetic performance.

[0003] Currently, there are already automated testing devices available in the industry for testing the resistance and magnetic force of electromagnets. Taking the "Fully Automatic Electromagnet Testing Machine" disclosed in existing patent CN208466530U as an example, existing technologies, including this patent, all involve placing the electromagnet horizontally on a support platform, using a cylinder to drive a test probe to form an electrical connection with the coil terminals of the electromagnet, and calculating the resistance based on the read current value; simultaneously, a drive motor or telescopic cylinder drives a pressure sensor or connecting block to engage and reset with the armature end of the electromagnet, in order to collect the tension and displacement parameters required to drive the armature to move, and thus evaluate the magnetic characteristics of the electromagnet.

[0004] However, existing technical solutions, including the aforementioned patents, generally suffer from the following technical defects: First, because the electromagnet is always placed horizontally during the test, there is a designed gap between the armature and the end of the core during the energization phase, and there is also a radial air gap between their sidewalls. Under these circumstances, the armature will inevitably be radially misaligned outside the core due to gravity, meaning the armature axis cannot be aligned with the core axis. This misalignment directly interferes with the alignment of the pressure sensor with the armature end in subsequent testing processes, causing the sensor probe to fail to achieve accurate and effective coaxial docking with the armature. This not only increases the positioning difficulty in the automated testing process but also introduces measurement errors due to the eccentricity of the mechanical connection, affecting the accuracy of the test data.

[0005] Secondly, when conducting armature tension tests in the aforementioned horizontal test posture, the armature must overcome not only the electromagnetic force or the return spring force, but also the equivalent frictional resistance generated by its own weight in the horizontal direction. Because there is contact friction between the armature and the iron core or guide sleeve during horizontal movement, and gravity exacerbates the uncertainty and nonlinearity of this frictional force, the tension value measured by the pressure sensor cannot accurately reflect the pure electromagnetic drive characteristics of the electromagnet, thus reducing the accuracy and repeatability of the magnetic calibration.

[0006] Furthermore, existing testing methods do not adequately consider the impact of dimensional tolerances in the electromagnet housing during injection molding or machining. When there are significant manufacturing tolerances in the electromagnet housing, the core may shift within the coil frame, altering the symmetry of the magnetic circuit structure and the uniformity of the air gap distribution. Resistance and magnetic force tests performed under these conditions will simultaneously couple the effects of product performance and assembly errors, failing to effectively isolate and identify test deviations introduced by housing tolerances. This leads to inaccurate assessments of the electromagnet's true performance by the testing system, making it difficult to meet the production requirements for high-precision screening and quality grading.

[0007] To address the aforementioned problems, designing an electromagnet resistance and magnetic force testing device and method is an important technical issue that needs to be solved by those skilled in the art. Summary of the Invention

[0008] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide an electromagnet resistance and magnetic force testing device and method.

[0009] The objective of this invention is achieved through the following technical solution: An electromagnet resistance and magnetic force testing device is used to test the resistance and magnetic force of an electromagnet. The electromagnet includes a housing, a core assembly coaxially disposed within the housing, a return spring and an armature disposed within the core assembly, and an attraction coil wound around the core assembly. The lead wires at both ends of the attraction coil protrude outside the housing. The electromagnet resistance and magnetic force testing device includes a base, on which a power supply assembly, an electric cylinder assembly, a force measuring assembly, and a support platform are fixed. The support platform forms a receiving space for accommodating the vertically placed electromagnet body; the energizing component includes a clamp assembly disposed beside the support platform, a cylinder assembly connected to the end of the clamp assembly, a first contact group disposed on the cylinder assembly, a second contact group and a third contact group located at the front end of the first contact group; the clamp assembly clamps onto the lead wires at both ends of the attracting coil; after the cylinder assembly is energized, it drives the first contact group and the second contact group to electrically connect, directly obtaining the resistance value of the electromagnet body; the cylinder assembly drives the first contact group and the third contact group to electrically connect, supplying power to the electromagnet, causing the core assembly to attract and the armature to move away from its tail direction; The electric cylinder assembly is located directly above the support platform. The force measuring component is disposed on the output end of the electric cylinder assembly and is coaxially arranged with the armature. The force measuring component includes a pressure sensor and a pressure sensor probe, both of which are driven by the electric cylinder assembly. The pressure sensor probe contacts the iron core end of the electromagnet, and then drives the iron core end to move downward a specified distance to detect the magnetic force data of the electromagnet body within the specified distance range, forming the stroke-force data curve of the electromagnet. The stroke-force data curve is compared with the calibrated stroke-force data curve to determine whether the electromagnet is of good quality.

[0010] Preferably, the assembly further includes a displacement sensor group, which includes a first displacement sensor disposed on the side of the support platform away from the energized component and a second displacement sensor disposed beside the electric cylinder component; both are facing the support platform and are disposed perpendicular to each other; the first displacement sensor is used to detect whether the pressure sensor probe is in contact with the armature, thereby controlling whether the second displacement sensor is activated; the second displacement sensor is used to detect whether the pressure sensor probe has moved to a specified distance.

[0011] Preferably, the support platform includes a first baffle, a second baffle, a left limiting plate, and a right limiting plate; the first baffle and the second baffle are spaced apart and fixedly connected to the base by bolts; the left limiting plate and the right limiting plate are respectively disposed on the first baffle and the second baffle; the gap between the left limiting plate and the right limiting plate is equivalent to the length of the housing to form the receiving space; and the inner walls of the left limiting plate and the right limiting plate are each formed with a limiting groove matching the contour of the housing; the groove opening height is equivalent to the width of the housing, and the length is equivalent to the height of the housing.

[0012] Preferably, the base is further provided with a connecting block for mounting the clip assembly; the end of the clip assembly is disposed on the connecting block; the connecting block is a metal part, and the first segment of the wire connecting the clip assembly and the first contact group is located on the connecting block.

[0013] Preferably, the clamp assembly includes clamp A- and clamp B- disposed on the connecting block; the clamping surfaces of both clamps face the support platform and are used to clamp the first end wire and the last end wire of the attracting coil, respectively; clamp A- is connected to end point A- on the first contact group via a wire; clamp B- is connected to end point B- on the first contact group via a wire.

[0014] Preferably, the cylinder assembly includes a first cylinder and a second cylinder, which are arranged vertically; the first cylinder is located outside the clamp assembly and fixed to the base, driving the second cylinder to reciprocate at the front end of the second contact group and the third contact group; the first contact group is fixed on the output end of the second cylinder to drive the first contact group to be electrically connected to the second contact group or the third contact group.

[0015] Preferably, the second contact group is fixedly connected to the resistance meter; the third contact group is fixedly connected to the constant current source.

[0016] Preferably, the electric cylinder assembly includes an electric cylinder fixed on the base and an electric cylinder piston disposed on the output end of the electric cylinder; the electric cylinder piston is coaxially disposed with the armature.

[0017] Preferably, the pressure sensor is fixed to the electric cylinder piston by a mounting block, and the pressure sensor probe is disposed on the mounting block and coaxial with the armature; the first displacement sensor is disposed on the side of the electric cylinder piston.

[0018] The method of using the electromagnet resistance and magnetic force testing device includes the following steps: S1, the housing of the electromagnet to be tested is moved and placed in the support platform and coaxially arranged with the electric cylinder assembly; the first and last wires of the electromagnet's attracting coil are clamped by the clamp assembly respectively; S2, start the cylinder group to drive the first contact group and the second contact group to be electrically connected, so that the electromagnet's attraction coil is electrically connected to the resistance meter, and the resistance value of the electromagnet is directly measured. S3, after the first contact group and the second contact group are disconnected, the cylinder group drives the first contact group and the third contact group to be electrically connected, so that the attracting coil is electrically connected to the constant current power supply, thereby driving the iron core assembly of the electromagnet to attract, and at the same time the armature of the electromagnet moves towards the direction of the electric cylinder assembly under the action of magnetic force. S4, the electric cylinder assembly is activated, driving the electric cylinder piston, pressure sensor, and pressure sensor probe to move toward the armature until the pressure sensor probe contacts the end of the armature; the electric cylinder assembly continues to drive the pressure sensor probe and the armature to move downward a specified distance, and the pressure sensor records the force data within this stroke range to obtain the stroke-force data curve; S5. Based on the comparison between the stroke-force data curve obtained in step S4 and the standard stroke-force data curve, determine whether it exceeds the range of the standard stroke-force data curve. If so, the electromagnet is determined to be defective; otherwise, the electromagnet is determined to be good. At the same time, the electric cylinder assembly and the cylinder group are reset in sequence, causing the pressure sensor probe to disengage from the armature, the first contact group and the third contact group to disconnect, and then the armature is reset by the reset spring.

[0019] The advantages of the technical solution of this invention are mainly reflected in: The electromagnet is vertically confined within the support platform, ensuring that the armature of the electromagnet will not tilt during the testing process. This effectively reduces the influence of gravity and friction on the testing process, while also ensuring the coaxiality of the armature and the pressure sensor probe. When energized, the magnetic force generated by the electromagnet will overcome the influence of gravity and move upwards. This allows the electromagnet's magnetic force to be obtained simply by pressing the armature and recording the pressure during the test, eliminating the influence of gravity on the test results and improving the validity and accuracy of the test results. No additional structures such as a turntable are required. The detection of resistance and electromagnetic force can be switched through a cylinder group. The overall cost is low and the reliability is high. When detecting the resistance value of the electromagnet, the resistance value can be obtained directly by simply turning on the first contact group and the second contact group. No calculation is required, which improves the detection efficiency. Step S4 can eliminate individual differences in armature offset or movement distance caused by inconsistent electromagnet housing dimensions, thereby eliminating errors in test results caused by tolerances. Attached Figure Description

[0020] Figure 1 : A cross-sectional view of the electromagnet structure of the present invention; Figure 2 : A three-dimensional structural diagram of the present invention; Figure 3 This invention Figure 2 Enlarged view of section A; Figure 4 This invention Figure 2 Enlarged view of section B. Detailed Implementation

[0021] The objectives, advantages, and features of this invention will be illustrated and explained through the following non-limiting description of preferred embodiments. These embodiments are merely typical examples of applying the technical solutions of this invention, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this invention.

[0022] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solution, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.

[0023] This invention discloses an electromagnet resistance and magnetic force testing device for testing the resistance and magnetic force of an electromagnet. Figure 1 As shown, the electromagnet includes a housing 101, a core assembly 102 coaxially disposed within the housing 101, a return spring 103 and an armature 105 disposed within the core assembly 102, and a pull-in coil 104 wound around the core assembly 102. The lead wires at both ends of the pull-in coil 104 protrude from the outside of the housing 101 for connection to a power supply device to supply power to the electromagnet.

[0024] like Figure 2 As shown, the electromagnet resistance and magnetic force testing device includes a base 1, and a support platform 5 on the base 1. The support platform 5 has a receiving space for accommodating a vertically placed electromagnet body 101. Specifically... Figure 3 As shown, the support platform 5 includes a first baffle 501, a second baffle 502, a left limiting plate 503, and a right limiting plate 504. The first baffle 501 and the second baffle 502 are spaced apart and fixedly connected to the base 1 by bolts. The left limiting plate 503 and the right limiting plate 504 are respectively disposed on the first baffle 501 and the second baffle 502; and the gap between them is approximately equal to the length of the housing 101, thus forming the receiving space. Furthermore, the inner walls of the left limiting plate 503 and the right limiting plate 504 are each formed with a limiting groove matching the contour of the housing 101. The height of the groove opening is approximately equal to the width of the housing 101, and the length is approximately equal to the height of the housing 101. Therefore, by limiting the placement space of the electromagnet to be tested through the limiting groove, the stability of the electromagnet placed on the bearing platform 5 is ensured, and the coaxiality of the electromagnet and the force measuring component 4 on the base 1 is ensured, thereby ensuring the coaxiality of the armature in the electromagnet and the pressure sensor probe 402 in the force measuring component 4.

[0025] like Figure 2As shown, a power supply component 2 is also fixed on the base 1. The power supply component 2 is a power supply device used to supply power to the electromagnet under test and drive its operation. Combined with... Figure 2 and Figure 4 As shown, the energizing component 2 includes a clamp assembly 206 disposed beside the support platform 5, a cylinder assembly 20 connected to the end of the clamp assembly 206, a first contact group 203 disposed on the cylinder assembly 20, a second contact group 204 located at the front end of the first contact group 203, and a third contact group 205. The second contact group 204 is fixedly connected to a resistance meter; the third contact group 205 is fixedly connected to a constant current source.

[0026] like Figure 2 As shown, the base 1 is also provided with a connecting block for mounting the clip assembly 206. The end of the clip assembly 206 is disposed on this connecting block, and the connecting block is preferably a metal piece. The first segment of the wire connecting the clip assembly 206 and the first contact group 203 is located on this connecting block. The clip assembly 206 is clamped onto the first and last end wires of the suction coil 104. Figure 2 and Figure 3 As shown, the clip assembly 206 includes clips A206-1 and B206-2 disposed on the connecting block. Both clips have their clamping surfaces facing the support platform 5 and are used to clamp the first and last end wires of the attraction coil 104, respectively. The end of clip A206-1 is connected to end point A203-1 on the first contact group 203 via a wire. The end of clip B206-2 is connected to end point B203-2 on the first contact group 203 via a wire.

[0027] The electromagnet to be tested is connected to the cylinder assembly 20 via the clamp assembly 206, and after the cylinder assembly 20 is started, it is electrically connected to a resistance meter or a constant current source. Figure 2 and Figure 4 As shown, after the cylinder group 20 is ventilated, it drives the first contact group 203 and the second contact group 204 to be electrically connected, and the resistance value of the electromagnet body 101 can be directly obtained.

[0028] Specifically, the cylinder assembly 20 includes a first cylinder 201 and a second cylinder 202, which are arranged perpendicularly. The first cylinder 201 is located outside the clamp assembly 206 and fixed to the base 1, driving the second cylinder 202 to reciprocate at the front end of the second contact group 204 and the third contact group 205. The first contact group 203 is fixed to the output end of the second cylinder 202, which drives the first contact group 203 to electrically connect with the second contact group 204 or the third contact group 205. When the first cylinder 201 and the second cylinder 202 drive the first contact group 203 to electrically connect with the second contact group 204, the electromagnet to be tested is electrically connected to the resistance meter, and the resistance meter directly obtains the resistance value corresponding to the electromagnet. By comparing the measured resistance value with the calibrated resistance range, if it does not exceed the calibrated resistance range, the resistance test of the electromagnet is considered qualified; otherwise, the electromagnet is determined to be a non-defective product. The calibrated resistance range can be adjusted and set according to requirements, and no specific limitation is made here.

[0029] The cylinder group 20 drives the first contact group 203 and the third contact group 205 to electrically connect, supplying power 105 to the electromagnet, causing the iron core assembly 102 to be attracted and the armature 105 to move away from its tail. That is, the second cylinder 202 drives the first contact group 203 to disconnect from the second contact group 204; then the first cylinder 201 drives the second cylinder 202 and the first contact group 203 to move to the front end of the third contact group 205, and the second cylinder 202 is activated again to drive the first contact group 203 and the third contact group 205 to electrically connect, realizing the electrical connection between the electromagnet and the constant current power supply, that is, the electromagnet is energized; at this time, the armature 105 in the electromagnet will move upward under the action of magnetic force, overcoming its own gravity and the spring force of the reset spring 103, preparing for the subsequent force measuring component 4 to detect the magnetic force of the electromagnet.

[0030] like Figure 2 As shown, an electric cylinder assembly 3 is also fixed on the base 1. The electric cylinder assembly 3 provides driving force to the force measuring assembly 4, causing it to reciprocate vertically. Furthermore, the electric cylinder assembly 3 is located directly above the support platform 5. The electric cylinder assembly 3 includes an electric cylinder 302 fixed to the base 1 and an electric cylinder piston 301 disposed on the output end of the electric cylinder 302. The electric cylinder piston 301 is coaxially arranged with the armature 105.

[0031] Furthermore, the base 1 is also fixed with such as Figure 1The force measuring component 4 shown is used to detect the magnetic force of the electromagnet under test. The force measuring component 4 is located on the output end of the electric cylinder assembly 3 and is coaxially arranged with the armature 105. Specifically, the force measuring component 4 includes, as shown... Figure 2 The pressure sensor 401 and pressure sensor probe 402 are shown. The pressure sensor 401 is fixed to the electric cylinder piston 301 by a mounting block. The pressure sensor probe 402 is mounted on the mounting block and coaxial with the armature 105, ensuring that the sensor probe 402 can quickly and accurately contact the armature 105 during testing. Both the pressure sensor 401 and the pressure sensor probe 402 are driven by the electric cylinder assembly 3, causing the pressure sensor probe 402 to contact the iron core end 105 of the electromagnet, and then driving the iron core end 105 downwards a specified distance to detect the magnetic force data of the electromagnet body 101 within that specified distance range, forming a stroke-force data curve of the electromagnet. The stroke-force data curve is compared with a calibrated stroke-force data curve to determine whether the electromagnet is of good quality.

[0032] Furthermore, the force measuring component 4 also includes a displacement sensor group, which includes a first displacement sensor 403-1 disposed on the side of the support platform 5 away from the energized component 2 and a second displacement sensor 403-2 disposed beside the electric cylinder 301 in the electric cylinder assembly 3. Both face the support platform 5 and are arranged perpendicular to each other. The first displacement sensor 403-1 is preferably a proximity sensor and is disposed beside the electric cylinder piston 301 to detect whether the pressure sensor probe 402 is in contact with the armature 105, thereby controlling whether the second displacement sensor 403-2 is activated. The second displacement sensor 403-2 is preferably a laser displacement sensor to detect whether the pressure sensor probe 402 has moved to a specified distance, and drives the electric cylinder assembly 3 to reset after the pressure sensor probe 402 has moved to the specified distance. Meanwhile, when the second displacement sensor 403-2 is activated, the pressure sensor 401 records the stroke-force data of the electromagnet in real time to form a stroke-force curve; finally, it is determined whether the curve is within the calibrated stroke-force curve range. If it is, the electromagnet is determined to be a good product; otherwise, the electromagnet is determined to be a defective product.

[0033] The present invention also includes a method for using the electromagnet resistance and magnetic force testing device, comprising the following steps: S1, the housing 101 of the electromagnet to be tested is moved and placed inside the support platform 5, and coaxially arranged with the electric cylinder assembly 3; the first and last end wires of the electromagnet's attracting coil 104 are clamped by the clamp assembly 206. Specifically, clamp A206-1 on the clamp assembly 206 clamps the first end wire of the attracting coil 104; clamp B206-2 on the clamp assembly 206 clamps the last end wire of the attracting coil 104; that is, the electromagnet is connected to the cylinder assembly 20.

[0034] S2, start the cylinder group 20 to drive the first contact group 203 and the second contact group 204 to electrically connect, so that the electromagnet's attraction coil 104 is electrically connected to the resistance meter, and the resistance value of the electromagnet is directly measured.

[0035] S2.1, Start the cylinder group 20 to supply air to the first cylinder 201 and the second cylinder 202 in the cylinder group 20; and start the first cylinder 201 to drive the second cylinder 202 and the first contact group 203 on it to move to the front end of the second contact group 204. S2.2, The second cylinder 202 is activated to drive the first contact group 203 to move to connect with the second contact group 204, so as to realize the electrical connection between the electromagnet to be tested and the resistance meter, and the resistance meter directly obtains the resistance value of the electromagnet. S2.3, compare the resistance value measured in step S2.2 with the calibrated resistance range. If the measured resistance value does not exceed the calibrated resistance range, the resistance value of the electromagnet is determined to meet the requirements, and step S3 is continued; otherwise, the electromagnet is determined to be a defective product and cannot pass the test.

[0036] S3, after the cylinder group 20 drives the first contact group 203 to disconnect from the second contact group 204, it then drives the first contact group 203 to electrically connect with the third contact group 205, so that the attracting coil 104 is electrically connected to the constant current power supply, thereby driving the iron core assembly 102 of the electromagnet to attract, and at the same time the armature 105 of the electromagnet moves towards the direction of the electric cylinder assembly 3 under the action of magnetic force.

[0037] S3.1, Start the second cylinder 202 to drive the first contact group 203 and the second contact group 204 to disconnect, so that the electromagnet and the resistance meter are disconnected. S3.2, the first cylinder 201 is reset, driving the second cylinder 202 and the first contact group 203 on it to move to the front end of the third contact group 205; S3.3, the second cylinder 202 is activated again, driving the first contact group 203 to connect with the third contact group 205, realizing the electrical connection between the electromagnet under test and the constant current power supply. At this time, the electromagnet under test is energized, and the armature 105 inside the housing 101 moves upward to its maximum stroke under the action of magnetic force, overcoming the action of gravity and the spring force 103.

[0038] S4, the electric cylinder assembly 3 is activated, driving the electric cylinder piston 301, pressure sensor 401 and pressure sensor probe 402 to move toward the armature 105 until the pressure sensor probe 402 contacts the end of the armature 105; the electric cylinder assembly 3 continues to drive the pressure sensor probe 402 and the armature 105 to move downward a specified distance, and the pressure sensor 401 records the force data within this stroke range to obtain the stroke-force data curve.

[0039] S4.1, the electric cylinder 302 in the electric cylinder assembly 3 drives the electric cylinder piston 301, and the pressure sensor 401 and pressure sensor probe 402 disposed on the electric cylinder piston 301 move toward the armature 105 until the pressure sensor probe 402 contacts the armature 105 and is detected by the first displacement sensor 403-1, while providing an enable signal to the second displacement sensor 403-2; S4.2, the electric cylinder 302 continues to drive the pressure sensor probe 402 downward, applying a force to the armature 105. Simultaneously, the reaction force is fed back to the pressure sensor 401, and is recorded in real time by the second displacement sensor 403-2 and the pressure sensor 401. The electric cylinder 302 stops operating only after the second displacement sensor 403-2 detects that the pressure sensor probe 402 has moved downward to a specified distance. S4.3, based on the stroke and pressure values ​​recorded by the second displacement sensor 403-2 and the pressure sensor 401 at the same time within a specified distance range, a stroke-force data curve is formed.

[0040] Ensuring consistent armature movement distance for each electromagnet under test eliminates individual variations caused by tolerances, guaranteeing the accuracy and effectiveness of armature movement position for each electromagnet under test, thereby improving the reliability of the test results.

[0041] S5. Based on the comparison between the stroke-force data curve obtained in step S4 and the standard stroke-force data curve, determine whether it exceeds the range of the standard stroke-force data curve; if so, the electromagnet is determined to be defective; otherwise, the electromagnet is determined to be good. At the same time, the electric cylinder assembly 3 and the cylinder group 20 are reset sequentially, causing the pressure sensor probe 402 to disengage from the armature 105, the first contact group 203 and the third contact group 205 to disconnect, and then the armature 105 is driven to reset by the reset spring 103.

[0042] This invention has many other embodiments, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this invention.

Claims

1. An electromagnet resistance and magnetic force testing device for testing the resistance and magnetic force of an electromagnet, wherein the electromagnet includes a housing (101), a core assembly (102) coaxially disposed within the housing (101), a return spring (103) and an armature (105) disposed within the core assembly (102), and an attraction coil (104) wound on the core assembly (102); the lead wires at the beginning and end of the attraction coil (104) protrude outside the housing (101); the electromagnet resistance and magnetic force testing device includes a base (1), on which a power supply assembly (2), an electric cylinder assembly (3), a force measuring assembly (4), and a support platform (5) are fixed; Its features are: The support platform (5) has a receiving space for accommodating the vertically placed electromagnet body (101); the energizing assembly (2) includes a clamp assembly (206) disposed on the side of the support platform (5), a cylinder assembly (20) connected to the end of the clamp assembly (206), a first contact assembly (203) disposed on the cylinder assembly (20), a second contact assembly (204) and a third contact assembly (205) located at the front end of the first contact assembly (203); the clamp assembly (206) clamps On the wires at the beginning and end of the attracting coil (104); after the cylinder group (20) is ventilated, it drives the first contact group (203) and the second contact group (204) to be electrically connected, directly obtaining the resistance value of the electromagnet body (101); the cylinder group (20) drives the first contact group (203) and the third contact group (205) to be electrically connected, supplying power (105) to the electromagnet, causing the iron core assembly (102) to attract and the armature (105) to move away from its tail direction; The electric cylinder assembly (3) is located directly above the support platform (5). The force measuring assembly (4) is set on the output end of the electric cylinder assembly (3) and is coaxially arranged with the armature (105). The force measuring assembly (4) includes a pressure sensor (401) and a pressure sensor probe (402), both of which are driven by the electric cylinder assembly (3) to make the pressure sensor probe (402) contact the iron core end (105) of the electromagnet, and then drive the iron core end (105) to move downward a specified distance to detect the magnetic force data of the electromagnet body (101) within the specified distance range, form the stroke-force data curve of the electromagnet, and compare the stroke-force data curve with the calibrated stroke-force data curve to determine whether the electromagnet is a good product.

2. The electromagnet resistance and magnetic force testing device according to claim 1, characterized in that: It also includes a displacement sensor group, which includes a first displacement sensor (403-1) disposed on the side of the support platform (5) away from the energized component (2) and a second displacement sensor (403-2) disposed on the side of the electric cylinder component (3); both are facing the support platform (5) and are disposed perpendicular to each other; the first displacement sensor (403-1) is used to detect whether the pressure sensor probe (402) is in contact with the armature (105), thereby controlling whether the second displacement sensor (403-2) is activated; the second displacement sensor (403-2) is used to detect whether the pressure sensor probe (402) has moved to a specified distance.

3. The electromagnet resistance and magnetic force testing device according to claim 1, characterized in that: The support platform (5) includes a first baffle (501), a second baffle (502), a left limiting plate (503), and a right limiting plate (504); the first baffle (501) and the second baffle (502) are spaced apart and fixedly connected to the base (1) by bolts; the left limiting plate (503) and the right limiting plate (504) are respectively disposed on the first baffle (501) and the second baffle (502); the gap between the left limiting plate (503) and the right limiting plate (504) is equivalent to the length of the housing (101) to form the receiving space; and the inner walls of the left limiting plate (503) and the right limiting plate (504) are formed with limiting grooves that match the contour of the housing (101); the height of the groove opening is equivalent to the width of the housing (101), and the length is equivalent to the height of the housing (101).

4. The electromagnet resistance and magnetic force testing device according to claim 1, characterized in that: The base (1) is also provided with a connecting block for setting the clip assembly (206); the end of the clip assembly (206) is set on the connecting block; the connecting block is a metal part, and the first segment of the wire connecting the clip assembly (206) and the first contact group (203) is located on the connecting block.

5. The electromagnet resistance and magnetic force testing device according to claim 4, characterized in that: The clamp assembly (206) includes clamp A (206-1) and clamp B (206-2) disposed on the connecting block; the clamping surfaces of both are facing the support platform (5), and are used to clamp the first end wire and the last end wire of the attracting coil (104) respectively; clamp A (206-1) is connected to end point A (203-1) on the first contact group (203) through a wire; clamp B (206-2) is connected to end point B (203-2) on the first contact group (203) through a wire.

6. The electromagnet resistance and magnetic force testing device according to claim 1, characterized in that: The cylinder assembly (20) includes a first cylinder (201) and a second cylinder (202), which are arranged vertically. The first cylinder (201) is located outside the clamp assembly (206) and fixed on the base (1), driving the second cylinder (202) to reciprocate at the front end of the second contact group (204) and the third contact group (205). The first contact group (203) is fixed on the output end of the second cylinder (202) to drive the first contact group (203) to be electrically connected to the second contact group (204) or the third contact group (205).

7. The electromagnet resistance and magnetic force testing device according to claim 6, characterized in that: The second contact group (204) is fixedly connected to the resistance meter; the third contact group (205) is fixedly connected to the constant current source.

8. The electromagnet resistance and magnetic force testing device according to claim 1, characterized in that: The electric cylinder assembly (3) includes an electric cylinder (302) fixed on the base (1) and an electric cylinder piston (301) disposed on the output end of the electric cylinder (302); the electric cylinder piston (301) is coaxially disposed with the armature (105).

9. The electromagnet resistance and magnetic force testing device according to claim 8, characterized in that: The pressure sensor (401) is fixed to the electric cylinder piston (301) by a mounting block, and the pressure sensor probe (402) is set on the mounting block and coaxial with the armature (105); the first displacement sensor (403-1) is set on the side of the electric cylinder piston (301).

10. The method of using the electromagnet resistance and magnetic force testing device according to any one of claims 1-9, characterized in that: Includes the following steps: S1, the housing (101) of the electromagnet to be tested is moved and placed in the support platform (5) and coaxially arranged with the electric cylinder assembly (3); the first and last wires of the electromagnet's attracting coil (104) are clamped by the clamp assembly (206); S2, start the cylinder group (20) to drive the first contact group (203) and the second contact group (204) to be electrically connected so that the electromagnet’s pull-in coil (104) is electrically connected to the resistance meter and the resistance value of the electromagnet is directly measured. S3, after the first contact group (203) and the second contact group (204) are disconnected, the cylinder group (20) drives the first contact group (203) and the third contact group (205) to be electrically connected, so that the attracting coil (104) is electrically connected to the constant current power supply, thereby driving the iron core assembly (102) of the electromagnet to attract, and at the same time the armature (105) of the electromagnet moves towards the direction of the electric cylinder assembly (3) under the action of magnetic force; S4, the electric cylinder assembly (3) is activated, driving the electric cylinder piston (301), pressure sensor (401) and pressure sensor probe (402) to move toward the armature (105) until the pressure sensor probe (402) contacts the end of the armature (105); the electric cylinder assembly (3) continues to drive the pressure sensor probe (402) and the armature (105) to move downward a specified distance, and the pressure sensor (401) records the force data within this stroke range to obtain the stroke-force data curve; S5. Based on the comparison between the stroke-force data curve obtained in step S4 and the standard stroke-force data curve, determine whether it exceeds the range of the standard stroke-force data curve. If it does, the electromagnet is determined to be defective; otherwise, the electromagnet is determined to be good. At the same time, the electric cylinder assembly (3) and the cylinder group (20) are reset in sequence, so that the pressure sensor probe (402) is disengaged from the armature (105), the first contact group (203) and the third contact group (205) are disconnected, and then the armature (105) is reset by the reset spring (103).

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