Magnetic field ejection force testing equipment and magnetic force testing method

Abstract

The invention discloses magnetic field ejection force test equipment and a magnetic force test method, the magnetic field ejection force test equipment comprises a base, a plate body, a support member, a supporting device, an induction device and a heavy frame, the plate body is fixed above the base, the plate body is provided with a through hole, the through hole penetrates through the plate body along the vertical direction, and the plate body is suitable for placing a lifting magnet; the supporting piece is arranged in the through hole in a matched mode, the length of the supporting piece is larger than that of the through hole, and the supporting piece can stretch out of an upper hole opening of the through hole so that the lifting magnet can be ejected out of the plate body. The supporting and jacking device is arranged on the base and suitable for jacking and pushing the supporting piece so that the supporting piece can stretch out of an upper hole opening of the through hole; the sensing device is connected with the supporting and jacking device, the sensing device is arranged between the base and the lower ends of the supporting pieces, the sensing device is suitable for monitoring the supporting and jacking force of the supporting and jacking device, the heavy frame is matched between the supporting and jacking device and the multiple supporting pieces, and the heavy frame is suitable for synchronously jacking and pushing the multiple supporting pieces when the supporting and jacking device is used for supporting and jacking. The magnetic field ejection force testing equipment is simple and convenient to operate, high in safety, high in testing efficiency and high in testing precision.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic force testing, and in particular to a magnetic field push-off force testing device and a magnetic force testing method based on the magnetic field push-off force testing device. Background Art

[0002] Lifting magnets include lifting electromagnets, lifting permanent magnets, and electrically controlled permanent magnets. They are devices that use electromagnetic force or permanent magnetic force to hold workpieces. They are mainly used in power plants, metallurgy, mining, building materials and other industries, and are mainly used to absorb and transport ferromagnetic parts. In order to understand the performance of lifting magnets and ensure the safety of use, the lifting magnets should be measured for magnetic force before use, during use, and after overhaul. However, in the relevant technology, the measurement of the magnetic force of lifting magnets has problems such as cumbersome operation, poor safety, low test efficiency and test accuracy. Summary of the invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0004] In the related technology, lifting magnets are mostly tested by pulling off force. During the testing process, a special gantry is needed. Because the pulling off force of many large-tonnage lifting magnets is as high as tens of tons, the rigidity of the gantry must be sufficiently guaranteed. Therefore, the gantry has to be made bulky and tall, which is very inconvenient to transport. In particular, many round lifting electromagnets have a large diameter, some are close to 3 meters, and the lifting ring plus chain is more than 2 meters long, which requires a large and wide gantry and requires ultra-wide transportation.

[0005] Secondly, there are many and heavy attachments for connecting the lifting magnet and the gantry. It is very laborious to install them, and if you are not careful, your hands and feet may be squeezed. Due to the large test force, the connecting shaft pins of the attachments are easily deformed, bent, and broken, resulting in the cost of wearing parts. When the shaft pins are deformed, it is not easy to remove them, which often adds a lot of trouble and man-hours, affecting the efficiency of detection and testing.

[0006] In the related technology, the lifting magnet needs to be lifted to the center of the test plate by the crane hook, and the gantry also needs to be moved to the corresponding position. Then, the gantry hook needs to be used to complete the tare weighing of the lifting magnet, and the hook on the gantry needs to be continuously raised and lowered to generate a magnetic field. During the weighing process, the eccentrically inclined wire rope will rub against the crossbeam of the gantry. After the test is completed, the same method is used to demagnetize and lift it out, and the eccentrically inclined wire rope is used to rub against the crossbeam of the gantry. This series of operations are prone to safety accidents.

[0007] In addition, when the lifting magnet is pulled off vertically with strong force, it will generate large vibration and shaking, which will affect the measurement accuracy and service life of the force measuring instrument. When repeating the test, it is difficult for the lifting magnet to overlap the last position when it is placed again, resulting in a large error in the polarity of the residual magnetic field generated by the previous test on the test board and the polarity of the regenerated magnetic field. The magnetic forces may cancel each other out, resulting in a large error in the repeatability of the force value data.

[0008] Finally, there is no good way to place many lifting magnets that are inseparable or difficult to disassemble under the gantry, and it is almost impossible to measure the magnetic value. Especially for combined lifting, it can only be tested after being disassembled, which will increase the time and workload of disassembly and installation, delay the normal production of users, and cause economic losses.

[0009] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0010] To this end, an embodiment of the present invention provides a magnetic field push-off force testing device, which is easy to operate, highly safe, and has high testing efficiency and testing accuracy.

[0011] The embodiment of the present invention further provides a magnetic force testing method based on the above-mentioned magnetic field lifting force testing device.

[0012] The magnetic field lifting force testing equipment of the embodiment of the present invention comprises: a base; a plate body, the plate body is fixed above the base, the plate body is provided with a through hole, the through hole penetrates the plate body along the up and down direction, and the plate body is suitable for placing a lifting magnet; a support member, the support member is fitted in the through hole, the length dimension of the support member is larger than the length dimension of the through hole, and the support member can be extended from the upper hole of the through hole to lift the lifting magnet off the plate body; a supporting device, the supporting device is arranged on the base, the supporting device is suitable for pushing the supporting member so that the supporting member extends from the upper hole of the through hole; a sensing device, the sensing device is connected to the supporting device, the sensing device is arranged between the base and the lower end of the support member, and the sensing device is suitable for monitoring the supporting force of the supporting device.

[0013] In some embodiments, there are multiple through holes, and the multiple through holes are divided into multiple hole groups. The plate body has circumferential and radial directions, and the multiple hole groups are arranged at intervals along the circumference of the plate body, and each hole group includes multiple through holes arranged at intervals along the radial direction of the plate body; there are multiple support members, and the multiple support members are arranged one-to-one with the multiple hole groups, and each support member is suitable for fitting in different through holes of each hole group to realize the adjustable supporting positions of the multiple support members.

[0014] In some embodiments, the plate body is provided with a central hole, the central hole is located at the intersection of the extension directions of the plurality of hole groups, and the support member is assembled in the central hole.

[0015] In some embodiments, there are multiple top-supporting devices, and the multiple top-supporting devices are arranged one-to-one under the multiple support members, and each of the top-supporting devices is suitable for supporting each of the support members. There are multiple sensing devices, and the multiple sensing devices correspond one-to-one to the multiple top-supporting devices.

[0016] In some embodiments, there are multiple bases, and the multiple bases include multiple first seats, and the multiple first seats are arranged one by one below the multiple hole groups. Each first seat is provided with a first groove, and the first groove extends along the radial direction of the plate body with the groove facing upward. The top support device is arranged in the first groove and its position is adjustable along the extension direction of the first groove.

[0017] In some embodiments, the plurality of bases include a second seat, the second seat is disposed at the intersection of the plurality of first seats, the second seat is provided with a second groove, and the top supporting device below the center hole is assembled in the second groove.

[0018] In some embodiments, the top supporting device has a driving end facing the supporting member, and the driving end of the top supporting device is provided with a slot, and the supporting member fits in the slot.

[0019] In some embodiments, the magnetic field top-off force testing equipment includes a load-bearing frame, a plurality of through holes are provided on the plate body, the plurality of through holes are each equipped with the support members, the load-bearing frame is fitted between the top-supporting device and the plurality of the support members, and the load-bearing frame is suitable for synchronously pushing the plurality of the support members when the top-supporting device is supporting.

[0020] In some embodiments, the plurality of through holes include multiple rows and multiple columns, the plate body has a length direction and a width direction, each row of the through holes includes a plurality of the through holes arranged at intervals along the length direction of the plate body, and each column of the through holes includes a plurality of the through holes arranged at intervals along the width direction of the plate body.

[0021] In some embodiments, the shape of the load-bearing frame is consistent with the arrangement shape of the plurality of through holes.

[0022] In some embodiments, there are multiple bases, each of which is provided with a matching groove, and the load-bearing frame can be slidably fitted in the matching grooves of the multiple bases. There are multiple top-supporting devices, and the multiple top-supporting devices are matched one by one in the matching grooves of the multiple bases, and the multiple top-supporting devices are suitable for synchronously supporting the load-bearing frame.

[0023] In some embodiments, the side wall of the base is provided with a flange, the flange is provided with an assembly hole, the base is connected to the plate body via a fastener, and the assembly hole is suitable for the fastener to pass through.

[0024] In some embodiments, the base is provided with a reinforcing plate, and the reinforcing plate is connected between the side wall of the base and the flange.

[0025] The magnetic force testing method according to the embodiment of the present invention comprises the following steps:

[0026] S1: Place a lifting magnet in a non-magnetic state on top of the plate;

[0027] S2: using a supporting device to push the support member upward until the support member lifts the lifting magnet from the plate body, and using a sensing device to record a first force peak value when the lifting magnet is lifted;

[0028] S3: releasing the upward supporting force of the supporting device to make the lifting magnet drop back to the plate body, and then operating the lifting magnet to generate a magnetic field;

[0029] S4: using a supporting device to push the support member upward until the support member lifts the lifting magnet from the plate body, and using a sensing device to record a second force peak when the lifting magnet is lifted off;

[0030] S5: Calculate the difference between the second force peak value and the first force peak value to obtain the magnetic force value of the lifting magnet;

[0031] S6: Repeat steps S1 to S5 to obtain a plurality of magnetic values, and then average the plurality of magnetic values ​​or select the maximum value.

[0032] The magnetic field top-off force testing device (hereinafter referred to as the testing device) and the magnetic force testing method of the embodiment of the present invention have the following technical effects:

[0033] 1. The test equipment is placed at the lower end of the test plate, and the lifting magnet can be pushed off from the bottom of the magnetic adsorption surface with a support such as a push rod or a push bar, and the peak force value can be obtained. There is no need for a large and bulky pull-off gantry, and the testing instrument is light and simple, easy to move to the door for testing, and convenient for operation.

[0034] 2. When in use, the lifting magnet crane can be placed directly on the plate of the test equipment, without the need to install and disassemble cumbersome and bulky connecting devices, which not only reduces physical strength, but also speeds up the detection speed and improves the test efficiency.

[0035] 3. For lifting magnets that cannot be disassembled or are inconvenient to disassemble, they can be placed directly on the plate without being disassembled. First, measure the gross weight, and then measure the total force value under the same conditions. Subtract the gross weight, which is the push-off force value (magnetic force value), which is the original pull-off force value. This facilitates the detection of lifting magnets that were originally inconvenient or unable to detect magnetic force.

[0036] 4. During the inspection, there is no gantry that is not very stable, often requires manpower to push, and is often hit and hung by the crane hook and wire rope, which enhances the safety of the working environment of the inspectors.

[0037] 5. The ejection force is to slowly apply force from the bottom to eject the lifting magnet, which will not produce a large instantaneous impact force on the sensing device, making the measurement force value data more accurate.

[0038] 6. Since the instantaneous impact force of the ejection force is small, the lifting magnet deflects less when it is ejected. When repeated testing is required, the magnetic field conduction position match error between the magnet and the test plate is small, and the repeatability error of the force test data will be reduced accordingly, thereby improving the precision and accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a three-dimensional schematic diagram of a magnetic field lift-off force testing device according to an embodiment of the present invention.

[0040] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle base.

[0041] Figure 3 yes Figure 2 Schematic diagram of the second building.

[0042] Figure 4 yes Figure 1 Schematic diagram of the contraction of the middle support device and the sensing device.

[0043] Figure 5 yes Figure 1 Schematic diagram of the support.

[0044] Figure 6 yes Figure 1 Schematic diagram of the extension of the middle support top device.

[0045] Figure 7 yes Figure 1 Schematic diagram of the upward perspective view of the medium magnetic lift-off force testing equipment when in use.

[0046] Figure 8 yes Figure 1 Schematic side view of the medium magnetic lift-off force test equipment in use.

[0047] Fig. 9It is a three-dimensional schematic diagram of a magnetic ejection force testing device in another embodiment of the present invention.

[0048] Fig.10 yes Fig. 9 Schematic diagram of the coordination between the middle load-bearing frame and the base.

[0049] Fig.11 yes Fig. 9 A three-dimensional schematic diagram of the medium magnetic lift-off force testing equipment.

[0050] Fig.12 yes Fig. 9 A side view of the medium magnetic lift-off force test equipment.

[0051] Fig.13 yes Fig. 9 Schematic diagram of a partial cross-section of the medium magnetic lift-off force testing equipment.

[0052] Fig.14 It is a partial cross-sectional schematic diagram of the use state of the magnetic ejection force testing device in another embodiment of the present invention.

[0053] Reference numerals:

[0054] Magnetic field top-off force testing equipment 100;

[0055] Base 1; first seat 11; first groove 111; second seat 12; second groove 121; flange 13; assembly hole 14; reinforcement plate 15; matching groove 101;

[0056] Plate body 2; through hole 21; center hole 22;

[0057] Support member 3; slot 31;

[0058] Top support device 4; piston 41; cylinder body 42;

[0059] Sensing device 5;

[0060] Load-bearing frame 6;

[0061] Lifting magnet 200. DETAILED DESCRIPTION

[0062] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0063] like Figures 1 to 14 As shown, the magnetic field top-off force testing device 100 of the embodiment of the present invention includes a base 1, a plate 2, a support member 3, a top-supporting device 4 and a sensing device 5.

[0064] like Figure 1As shown, the base 1 can be arranged at the bottom, and the base 1 can be an integral structure and can be connected and fixed to the ground or other platforms. During the test, the base 1 can withstand a large reverse force and remain motionless.

[0065] The plate body 2 is fixed above the base 1, and the plate body 2 is provided with a through hole 21, which penetrates the plate body 2 in the up-down direction, and the plate body 2 is suitable for placing the lifting magnet 200. Figure 1 As shown, the plate body 2 can be welded and fixed on the top of the base 1. In some other embodiments, the plate body 2 can also be detachably fixed on the top of the base 1 by fasteners such as bolts. The upper surface of the plate body 2 can be a plane and is used to place the lifting magnet 200.

[0066] The support member 3 is fitted in the through hole 21, and the support member 3 can extend from the upper opening of the through hole 21 to push the lifting magnet 200 off the plate body 2. Figure 1 As shown, the support member 3 can be a pin shaft, the support member 3 can be fitted in the through hole 21, and can move in the up and down directions. When the support member 3 moves upward, a part of the support member 3 can extend from the upper hole of the through hole 21, so that the lifting magnet 200 can be pushed off from the plate body 2. When the support member 3 moves downward, the support member 3 can be hidden in the through hole 21. At this time, the lifting magnet 200 can be placed above the plate body 2.

[0067] It should be noted that in the up and down directions, the length dimension of the support member 3 is greater than the length dimension of the through hole 21. Therefore, on the one hand, it meets the use requirement of the support member 3 extending out of the through hole 21, and on the other hand, it can avoid the situation where a part of the top support device 4 needs to be inserted into the through hole 21 when the support member 3 is shorter, thereby avoiding the need for the top support device 4 to cater to the aperture design of the through hole 21, eliminating the constraints of the through hole 21 on the top support device 4, and reducing the design requirements for the top support device 4.

[0068] The top supporting device 4 is disposed on the base 1, and the top supporting device 4 is suitable for pushing the supporting member 3 so that the supporting member 3 extends out from the upper opening of the through hole 21. Figure 1 As shown, the top supporting device 4 can be a jack, and of course it can also be other types of top supporting devices 4, such as a pneumatic top supporting device 4, an electric push rod, etc. The top supporting device 4 can be fixed on the base 1 and located below the plate body 2. The top supporting device 4 can be retractable, and the support member 3 can be connected to the top of the top supporting device 4. When the top supporting device 4 is extended, the top supporting device 4 can drive the support member 3 to move upward, so that the support member 3 can be pushed out from the through hole 21.

[0069] The sensing device 5 is connected to the top supporting device 4, and the sensing device 5 is suitable for monitoring the top supporting force of the top supporting device 4. The sensing device 5 can be a pressure sensor. The sensing device 5 can be arranged at the bottom end of the top supporting device 4, and the sensing device 5 can be clamped between the top supporting device 4 and the base 1. In some other embodiments, the sensing device 5 can also be arranged between the support member 3 and the top supporting device 4. When the top supporting device 4 is extended, the top supporting device 4 will apply a reverse force to the sensing device 5, and the sensing device 5 can monitor the reverse force, so as to indirectly measure the force value required to lift the lifting magnet 200 off the plate body 2.

[0070] In some embodiments, there are multiple through holes 21, and the multiple through holes 21 are divided into multiple hole groups. The plate body 2 has circumferential and radial directions, and the multiple hole groups are arranged at intervals along the circumference of the plate body 2, and each hole group includes multiple through holes 21 arranged at intervals along the radial direction of the plate body 2; there are multiple support members 3, and the multiple support members 3 are arranged one-to-one corresponding to the multiple hole groups, and each support member 3 is suitable for fitting in different through holes 21 in each hole group to realize the adjustable supporting positions of the multiple support members 3.

[0071] like Figure 1 As shown, the plate body 2 may be disc-shaped, and three hole groups may be provided. The three hole groups may be arranged at equal intervals along the circumference of the plate body 2, that is, the angle between two connected hole groups may be 120 degrees. Each hole group may include a plurality of through holes 21, and the plurality of through holes 21 of each hole group are arranged at intervals along the radial direction of the plate body 2. In some other embodiments, the number of hole groups may also be four, five, six, seven, eight, etc.

[0072] The number of support members 3 can be consistent with the number of hole groups. When in use, each hole group can be equipped with a support member 3, and the support member 3 can be inserted into different through holes 21 of the same hole group, so as to adjust the support position of the support member 3. Therefore, on the one hand, the support profiles of the multiple support members 3 can be adapted to the shape of the lifting magnet 200, and on the other hand, the support requirements for lifting magnets 200 of different specifications and sizes can be met.

[0073] For example, the lifting magnet 200 can be disc-shaped. When the radial dimension of the lifting magnet 200 is large, multiple support members 3 can be respectively inserted into the outermost through holes 21 of multiple hole groups. When the radial dimension of the lifting magnet 200 is small, multiple support members 3 can be respectively inserted into the inner through holes 21 of multiple hole groups.

[0074] Preferably, when the lifting magnet 200 and the plate body 2 are both disc-shaped, the plurality of support members 3 can be located on the same circumference, which can enhance the balance and stability of the support.

[0075] In some embodiments, the plate body 2 is provided with a central hole 22, the central hole 22 is located at the intersection of the extension directions of the plurality of hole groups, and the support member 3 is installed in the central hole 22. Figure 1 As shown, the plate body 2 can be disc-shaped, the center hole 22 can be set at the axial position of the plate body 2, and a support member 3 can also be installed in the center hole 22. When in use, the support member 3 at the center hole 22 can support the center position of the lifting magnet 200, which can further improve the balance of the supporting force distribution and the stability of the support.

[0076] In some embodiments, there are multiple top supporting devices 4, and the multiple top supporting devices 4 are arranged one-to-one under the multiple support members 3, and each top supporting device 4 is suitable for supporting each support member 3. There are multiple sensing devices 5, and the multiple sensing devices 5 correspond one-to-one to the multiple top supporting devices 4.

[0077] like Figure 2 As shown, the number of top-supporting devices 4 can be the same as the number of supporting members 3. When in use, multiple top-supporting devices 4 can be extended synchronously, and each top-supporting device 4 can lift up the corresponding supporting member 3, thereby realizing synchronous top-supporting of multiple supporting members 3. Multiple sensing devices 5 can also be provided, and each sensing device 5 can be provided under the corresponding top-supporting device 4. When in use, each sensing device 5 can realize independent monitoring of each top-supporting device 4.

[0078] Therefore, on the one hand, the safety and stability of use can be guaranteed, avoiding the problem of accidents caused by failure when only one of the top support device 4 and the sensing device 5 is set; on the other hand, the accuracy of measurement can be improved. Multiple data can be obtained through multiple sensing devices 5, avoiding the situation where a single data cannot be judged.

[0079] In some embodiments, there are multiple bases 1, and the multiple bases 1 include multiple first seats 11. The multiple first seats 11 are arranged one by one below the multiple hole groups. Each first seat 11 is provided with a first groove 111. The first groove 111 extends along the radial direction of the plate body 2 and the groove faces upward. The top support device 4 is arranged in the first groove 111 and the position is adjustable along the extension direction of the first groove 111.

[0080] like Figure 2 As shown, three first seats 11 may be provided, and the three first seats 11 are all provided below the plate body 2, and the three first seats 11 are arranged at equal intervals along the circumference of the plate body 2, that is, the angle formed by two adjacent first seats 11 is 120 degrees. The number of first seats 11 may be the same as the number of hole groups on the plate body 2, that is, each first seat 11 may correspond to a hole group and be located below the hole group. The first seat 11 may be a U-shaped long groove, and each first seat 11 extends along the radial direction of the plate body 2.

[0081] The first groove 111 may be a rectangular groove, each first seat 11 is provided with the first groove 111, and a top supporting device 4 may be installed in the first groove 111 of each first seat 11, and the top supporting device 4 may move along the first groove 111, so as to adapt to the position of each supporting member 3 on the plate body 2. In addition, the setting of the first groove 111 has a protective effect, and the top supporting device 4 and the sensing device 5 may be installed in the first groove 111, thereby avoiding the situation where the top supporting device 4 and the sensing device 5 are exposed to the outside.

[0082] In some embodiments, the plurality of bases 1 include a second base 12, which is disposed at the intersection of the plurality of first bases 11, and the second base 12 is provided with a second groove 121, and the top supporting device 4 below the central hole 22 is assembled in the second groove 121. Figure 2 As shown, only one second seat 12 may be provided, and the second seat 12 may be provided below the plate body 2 and directly opposite to the axis of the plate body 2. The second seat 12 is generally U-shaped, and the top supporting device 4 and the sensing device 5 are installed in the second groove 121 of the second seat 12, thereby playing a protective effect on the top supporting device 4 and the sensing device 5 at the center position of the plate body 2.

[0083] In some embodiments, the top supporting device 4 has a driving end facing the supporting member 3, and the driving end of the top supporting device 4 is provided with a slot 31, and the supporting member 3 fits in the slot 31. Figures 4 to 6 As shown, the top supporting device 4 can be a jack, and the jack can be a one-to-four combination electric jack. The top supporting device 4 includes a cylinder 42 and a piston 41, and the piston 41 is movably fitted in the cylinder 42. The piston 41 generally extends in the up-down direction, and the top of the piston 41 forms a driving end, and the slot 31 is provided at the top of the piston 41. During installation, the support member 3 can be directly inserted into the slot 31 of the piston 41, so that on the one hand, the installation and removal of the support member 3 are convenient, and on the other hand, the support member 3 can be guided and positioned, and the consistency of the top supporting of multiple support members 3 is ensured.

[0084] In some embodiments, the magnetic field top-off force testing equipment 100 includes a load-bearing frame 6, a plurality of through holes 21 are provided on the plate body 2, and support members 3 are installed in each of the plurality of through holes 21. The load-bearing frame 6 is cooperated between the top supporting device 4 and the plurality of support members 3. The load-bearing frame 6 is suitable for synchronously pushing the plurality of support members 3 when the top supporting device 4 is supporting.

[0085] like Fig. 9 , Fig.10 and Fig.13As shown, the load-bearing frame 6 can be arranged between the base 1 and the plate body 2. When the number of top supporting members is large, the top supporting devices 4 cannot correspond one to one. By arranging the load-bearing frame 6 between multiple top supporting members and the top supporting devices 4, the number of top supporting members and the number of top supporting devices 4 are not restricted by each other, that is, fewer top supporting devices 4 can be used to support a larger number of top supporting members, thereby meeting the use requirements.

[0086] In some embodiments, the plurality of through holes 21 include multiple rows and multiple columns, the plate body 2 has a length direction and a width direction, each row of through holes 21 includes multiple through holes 21 arranged at intervals along the length direction of the plate body 2, and each column of through holes 21 includes multiple through holes 21 arranged at intervals along the width direction of the plate body 2.

[0087] like Fig. 9 As shown, the plurality of through holes 21 can be arranged in two rows and two columns, that is, the plurality of through holes 21 can be arranged in a tic-tac-toe shape as a whole. Since the lifting magnet 200 has a long strip magnetic pole arrangement form and a short strip magnetic pole arrangement form, the width of the magnetic pole varies, thus, the use requirements of the lifting magnet 200 of different widths and lengths can be met.

[0088] In some embodiments, the shape of the support frame 6 is consistent with the arrangement shape of the plurality of through holes 21. Fig. 9 As shown, the plurality of through holes 21 on the plate body 2 can be arranged in a tic-tac-toe shape, and correspondingly, the load-bearing frame 6 is also in a tic-tac-toe shape. Thus, it can play a supporting role for the plurality of support members 3, and can also reduce consumables and costs.

[0089] In some embodiments, there are multiple bases 1, and the bases 1 are provided with matching grooves 101. The load-bearing frame 6 can be slidably fitted in the matching grooves 101 of the multiple bases 1. There are multiple top-supporting devices 4, and the multiple top-supporting devices 4 are matched one by one in the matching grooves 101 of the multiple bases 1, and the multiple top-supporting devices 4 are suitable for synchronously supporting the load-bearing frame 6.

[0090] like Fig.10 As shown, the number of bases 1 can be the same as the number of top supporting devices 4, and each top supporting device 4 is assembled in the matching groove 101 of the corresponding base 1. The arrangement of multiple bases 1 can be adapted to the shape of the bearing frame 6, and the bearing frame 6 can be simultaneously matched in the matching grooves 101 of multiple bases 1, thereby, on the one hand, the guiding accuracy of the movement of the bearing frame 6 can be enhanced, and on the other hand, the assembly accuracy of the bearing frame 6 can be guaranteed.

[0091] In some embodiments, the side wall of the base 1 is provided with a flange 13, and the flange 13 is provided with an assembly hole 14. The base 1 is connected to the plate body 2 through a fastener, and the assembly hole 14 is suitable for the fastener to pass through. Figure 2As shown, the base 1 may be provided with two flanges 13, which may be respectively arranged on one side of the base 1, and the two flanges 13 extend along the extension direction of the base 1. Each flange 13 may be provided with a plurality of assembly holes 14, and the plurality of assembly holes 14 extend along the extension direction of the flange 13. The arrangement of the flange 13 can, on the one hand, increase the contact area between the base 1 and the plate body 2 and reduce the pressure effect when the base 1 and the plate body 2 are connected, and on the other hand, facilitate the connection and fixation of the base 1 and the plate body 2.

[0092] It is understandable that in some other embodiments, the base 1 may also be connected and fixed to the plate body 2 by welding, integral setting, snap fit, etc.

[0093] In some embodiments, the base 1 is provided with a reinforcing plate 15, and the reinforcing plate 15 is connected between the side wall of the base 1 and the flange 13. Figure 2 As shown, the reinforcing plate 15 may be a triangular plate, the reinforcing plate 15 may be fixed on the outside of the side wall, and the reinforcing plate 15 may be connected within the angle formed by the flange 13 and the side wall of the base 1. A plurality of reinforcing plates 15 may be provided, and the plurality of reinforcing plates 15 are arranged at intervals along the extension direction of the base 1. The provision of the reinforcing plates 15 may enhance the structural strength of the base 1, and meet the weighing requirements and impact requirements of the lifting magnet 200.

[0094] In some embodiments, Fig.14 As shown, the plate body 2 may be a rectangular plate, in which case the load-bearing frame 6 may not be provided between the plate body 2 and the base 1 .

[0095] The magnetic force testing method according to an embodiment of the present invention is described below.

[0096] The magnetic force testing method according to the embodiment of the present invention comprises the following steps:

[0097] S1: Place the lifting magnet 200 in a non-magnetic state on the plate 2. Figure 7 As shown, the lifting magnet 200 can be placed on the plate body 2 using a crane. After placement, the position of the lifting magnet 200 can be adjusted so that the lifting magnet 200 corresponds to the support member 3 in the up and down direction.

[0098] S2: Use the supporting device 4 to push the support member 3 upward until the support member 3 lifts the lifting magnet 200 from the plate body 2, and use the sensing device 5 to record the first force peak when the lifting magnet 200 is lifted. Figure 8 , Fig.11 and Fig.12 As shown, the top supporting device 4 may be a jack, and a hydraulic fluid may be introduced into the top supporting device 4 by a pump station, so that the top supporting device 4 may be extended. The first force peak may be regarded as the self-weight of the lifting magnet 200 .

[0099] It should be noted that the lifting magnet 200 in this embodiment can be only a magnetic device capable of generating a magnetic field, or can be regarded as a magnet assembly including accessories such as connectors, etc., which can simultaneously meet the measurement requirements of lifting magnets with convenient and inconveniently disassembled accessories.

[0100] S3: Release the upward supporting force of the supporting device 4, so that the lifting magnet 200 is lowered back to the plate body 2, and then operate the lifting magnet 200 to generate a magnetic field. The lifting magnet 200 can generate a magnetic field by passing current, and after power is passed, the lifting magnet 200 can be magnetically adsorbed to the plate body 2. The magnitude of the current passed can be selected according to actual conditions.

[0101] S4: Use the supporting device 4 to push the support member 3 upward until the supporting device 3 lifts the lifting magnet 200 from the plate body 2, and use the sensing device 5 to record the second force peak when the lifting magnet 200 is lifted. The second force peak is the combined force that the supporting device 4 needs to overcome between the magnetic force between the lifting magnet 200 and the plate body 2 and the weight of the lifting magnet 200 itself.

[0102] S5: Calculate the difference between the second force peak and the first force peak to obtain the magnetic force value of the lifting magnet 200. That is, the magnitude of the magnetic force between the lifting magnet 200 and the plate 2, i.e., the magnetic force value, can be obtained by subtracting the first force peak from the second force peak.

[0103] S6: Repeat steps S1 to S5 to obtain multiple magnetic force values, and then average the multiple magnetic force values ​​or select the maximum value. Conducting multiple tests and averaging the monitoring results can eliminate large errors and ensure the accuracy of monitoring. In some other embodiments, the maximum value of the multiple magnetic force values ​​monitored can also be selected, so that the user can clearly understand the maximum magnetic attraction load of the lifting magnet 200.

[0104] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention 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 limiting the present invention.

[0105] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0106] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0107] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0108] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0109] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A magnetic field top-off force testing device, characterized in that: include: Base, A plate body, the plate body is fixed above the base, the plate body is provided with a through hole, there are a plurality of through holes, the through holes penetrate the plate body along the up and down direction, and the plate body is suitable for placing a lifting magnet; A support member, the support member is fitted in the through hole, the length of the support member is greater than the length of the through hole, the support member can be extended from the upper hole of the through hole to push the lifting magnet off the plate body, there are multiple support members, each of the support members is suitable for fitting in a different through hole to achieve adjustable support positions of the multiple support members; A top supporting device, the top supporting device is arranged on the base, and the top supporting device is suitable for pushing the support member so that the support member extends out from the upper opening of the through hole; A sensing device, the sensing device is connected to the supporting device, the sensing device is arranged between the base and the lower end of the support member, and the sensing device is suitable for monitoring the supporting force of the supporting device; A load-bearing frame is fitted between the top-supporting device and the plurality of support members, and the load-bearing frame is suitable for synchronously pushing the plurality of support members when the top-supporting device is supporting the top.

2. The magnetic field lift-off force testing device according to claim 1, characterized in that: The plurality of through holes include a plurality of rows and a plurality of columns, the plate body has a length direction and a width direction, each row of the through holes includes a plurality of the through holes arranged at intervals along the length direction of the plate body, and each column of the through holes includes a plurality of the through holes arranged at intervals along the width direction of the plate body.

3. The magnetic field lift-off force testing device according to claim 1, characterized in that: The shape of the load-bearing frame is consistent with the arrangement shape of the plurality of through holes.

4. The magnetic field lift-off force testing device according to claim 1, characterized in that: There are multiple bases, each of which is provided with a matching groove. The load-bearing frame can be slidably matched in the matching grooves of the multiple bases. There are multiple top-supporting devices, and the multiple top-supporting devices are matched in the matching grooves of the multiple bases one by one, and the multiple top-supporting devices are suitable for synchronously supporting the load-bearing frame.

5. The magnetic field lift-off force testing device according to any one of claims 1 to 4, characterized in that: The side wall of the base is provided with a flange, and the flange is provided with an assembly hole. The base is connected to the plate body through a fastener, and the assembly hole is suitable for the fastener to pass through.

6. The magnetic field lift-off force testing device according to claim 5, characterized in that: The base is provided with a reinforcing plate, and the reinforcing plate is connected between the side wall of the base and the flange.

7. A magnetic force testing method based on the magnetic field lifting force testing device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Place a lifting magnet in a non-magnetic state on top of the plate; S2: using a supporting device to push the support member upward until the support member lifts the lifting magnet from the plate body, and using a sensing device to record a first force peak value when the lifting magnet is lifted; S3: releasing the upward supporting force of the supporting device to make the lifting magnet drop back to the plate body, and then operating the lifting magnet to generate a magnetic field; S4: using a supporting device to push the support member upward until the support member lifts the lifting magnet from the plate body, and using a sensing device to record a second force peak when the lifting magnet is lifted off; S5: Calculate the difference between the second force peak value and the first force peak value to obtain the magnetic force value of the lifting magnet; S6: Repeat steps S1 to S5 to obtain a plurality of magnetic values, and then average the plurality of magnetic values ​​or select the maximum value.

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