CN112858968A - Magnetic centering force detection device - Google Patents
Magnetic centering force detection device Download PDFInfo
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- CN112858968A CN112858968A CN202110121845.6A CN202110121845A CN112858968A CN 112858968 A CN112858968 A CN 112858968A CN 202110121845 A CN202110121845 A CN 202110121845A CN 112858968 A CN112858968 A CN 112858968A
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- 230000005415 magnetization Effects 0.000 description 6
- 230000005389 magnetism Effects 0.000 description 4
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- 238000000034 method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
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- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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Abstract
The invention relates to the field of magnetic force detection, in particular to a magnetic centering force detection device. The utility model provides a power detection device during magnetic return, includes that tension measuring mechanism and year thing mechanism, tension measuring mechanism includes that the tensiometer takes and is used for making the lifting unit that the tensiometer goes up and down, it includes upper plate and hypoplastron that sets up along the fore-and-aft direction to carry thing mechanism, the upper plate is located hypoplastron top, the tensiometer is located upper plate rear end top, the upper plate front end is equipped with downwardly extending's first support column, be equipped with 2n year thing block group between upper plate rear end and hypoplastron rear end, 2n year thing block group sets up along controlling the direction interval, and every year thing block group all includes a first year thing piece and a second year thing piece, first year thing piece is fixed with the upper plate, the second carries thing piece and hypoplastron is fixed, and adjacent about the first year thing piece of same year thing block group and second year thing piece. The invention has the advantage of improving the detection accuracy of the magnetic centering force.
Description
Technical Field
The invention relates to the field of magnetic force detection, in particular to a magnetic centering force detection device.
Background
The magnetic centering force generally refers to a force generated during pulling the magnet or magnetic assembly perpendicular to the magnetization direction, the direction of the force being perpendicular to the magnetization direction, the effect of the force being to return the magnet or magnetic assembly to an initial position perpendicular to the magnetization direction. Magnetic attraction generally refers to the force generated during pulling a magnet or magnetic assembly parallel to the direction of magnetization, the direction of which is parallel to the direction of magnetization, the effect of which is to return the magnet or magnetic assembly parallel to the direction of magnetization to an initial position.
Generally, the magnetic centering force of a pair of magnets or a magnetic assembly is detected each time, the existing equipment for testing the magnetic centering force is mostly modified from equipment for testing gravity, drawing force and shearing force, the magnetic centering force is different from the gravity, magnetic lines of force are rearranged along a path with the maximum magnetic permeability in the process that the magnets or the magnetic assemblies are pulled away from the initial position, and the corresponding magnetic centering force and the corresponding magnetic attraction force are also changed. The change of the magnetic attraction force in the deviation process is nonlinear, strong friction force can be generated when the magnetic attraction force acts on the contact surface, the detection of the magnetic force can be interfered due to the fact that the direction of the friction force is opposite to the direction of the magnetic force, and the detection result of the existing detection equipment is not accurate.
Disclosure of Invention
The invention aims to provide a magnetic centering force detection device capable of improving the detection accuracy of the magnetic centering force.
In order to achieve the purpose, the invention adopts the following technical scheme: a magnetic centering force detection device comprises a tension measurement mechanism and an object carrying mechanism, wherein the tension measurement mechanism comprises a tension meter and a lifting assembly used for lifting the tension meter, the object carrying mechanism comprises an upper plate and a lower plate which are arranged along the front-back direction, the upper plate is positioned above the lower plate, the tension meter is positioned above the rear end of the upper plate, the front end of the upper plate is provided with a first support column extending downwards, 2n object carrying block groups are arranged between the rear end of the upper plate and the rear end of the lower plate and are arranged at intervals along the left-right direction, each object carrying block group comprises a first object carrying block and a second object carrying block, the first object carrying block is fixed with the upper plate, the second object carrying block is fixed with the lower plate, the first object carrying block and the second object carrying block of the same object carrying block group are adjacent left and right, a first placing groove used for placing a product to be detected is formed on the first object carrying block, a second placing groove for placing a magnet for detection is formed on the second carrying block; when the rear end of the upper plate is connected with the tension meter and the tension meter moves upwards, the rear end of the upper plate can rotate upwards by taking the lower end of the first support column as the center.
When the device is used, 2n same products to be detected are respectively placed in the first placing grooves, the tensiometer is connected with the rear end of the upper plate, the rear end of the upper plate is pulled upwards for a certain distance through the lifting assembly, so that the rear end of the upper plate is turned upwards for a very small angle, and the tensile force F at the moment is measuredFront side(ii) a Then the upper plate is reset, the same magnets for detection are respectively placed in the 2n second placing grooves, then the rear end of the upper plate is pulled upwards for a certain distance through the lifting assembly, so that the rear end of the upper plate is turned upwards for a very small angle with the same size, and the tension F at the moment is measuredRear end(ii) a Finally, the upper plate is reset and the product is removed.
Wherein the tension F is calculated2，F2＝FRear end-FFront side. Wherein, the distance L between the axis of the first supporting column and the stress position at the rear end of the upper plate is obtained by measuring in advance2Measuring in advance to obtain the distance L between the axis of the first support column and the plane of the center of the product to be detected1And finally obtaining the magnetic centering force F of the measured product1＝F2*L2/L1. When the upper plate rotates, the minimum angle is smaller than 5 degrees, and when the upper plate rotates upwards by 5 degrees by taking the lower end of the first support column as the center, the front and back displacement of the rear end of the upper plate can be ignored. Wherein L is1The horizontal distance from the pivot of the front end of the upper plate to the center of the magnet or the magnetic assembly, and the equivalent distance can be actually measured for the magnet or the magnetic assembly with symmetrical centers; for non-centrosymmetric magnets or magnetic assemblies, this distance can be measured by existing software analysis.
Through waiting to detect product side and placing the magnet for detection, through setting up 2n individual year thing piece group to offset magnetic attraction each other, reduction that can be very big returns the in-process magnetic attraction interference problem of power and slope problem in the test magnetism, has also improved accuracy, uniformity and the repeatability that power detected in the magnetism simultaneously, returns the accurate detection of power in order to realize magnet or magnetic component's magnetism. Wherein n is a positive integer greater than or equal to 1. Wherein, can make upper plate and hypoplastron level before and after detecting to guarantee better that the front and back upper and lower position of 2n waiting to detect the product is the same, in order to guarantee that the front and back upper and lower position of detecting with the magnet is the same. The first placing groove can be arranged on the left side surface and the right side surface of the first carrying block, and also can be arranged on the front end surface and the rear end surface of the first carrying block, and the second placing groove is similar to the first placing groove. Wherein, the fixing of the product to be detected and the magnet for detection can be carried out by adopting a conventional tool. Wherein, smooth contact between the first year thing piece of year thing piece group and the second year thing piece, or the first year thing piece of year thing piece group has the clearance with the second year thing piece to wait to detect the attraction of product and detection magnet, so that the promotion of upper plate rotates.
Preferably, n is 1, and the first placing groove and the second placing groove are not communicated with each other; the two carrying block groups are arranged in bilateral symmetry. The two carrying blocks are only arranged, so that the production, processing and assembly cost of the invention can be better reduced, the magnetic attraction can be better counteracted, and the problem of detection precision reduction caused by the fact that the front and rear positions of the carrying block group are not aligned is avoided. Wherein, first standing groove and second standing groove do not communicate, can avoid waiting to detect the product absorption on detecting with the magnet to avoid the rising of first year thing piece. Wherein, two carry thing piece group bilateral symmetry and set up to can offset magnetic attraction better, with the detection precision that improves magnetism and return power.
Preferably, the lower end surface of the upper plate is always positioned above the upper end surface of the second carrying block; a first connecting plate is connected between the upper ends of the first carrying blocks, a second carrying plate is connected between the lower ends of the second carrying blocks, the first connecting plate is fixed with the upper plate, the second connecting plate is fixed with the lower plate, and the second carrying blocks are not contacted with the first connecting plate all the time; the first carrying block is always positioned on the upper side of the second connecting plate; the first carrying block is always positioned on the upper side of the second connecting plate.
The lower end surface of the upper plate can not be in contact with the upper end surface of the second carrying block, so that the friction force between the upper plate and the second carrying block during rotation is reduced. Set up first connecting plate and second connecting plate to carry out the assembly of 2n first year thing piece and second year thing piece, with the same of the upper and lower position around the 2n first thing piece of assurance better, with the same of the upper and lower position around guaranteeing 2n second year thing piece better. When the upper plate is in contact with the lower plate, the first carrier block can be supported on the second connecting plate, so that the rear end of the upper plate can be supported.
Preferably, the lower end surface of the first carrying block is of an arc-surface-shaped structure; or the lower end face of the first carrying block or a contact surface contacted with the lower end face of the first carrying block is provided with a yielding groove. The arrangement reduces the friction between the first object carrying block and the second connecting plate or the lower plate when the rear end of the upper plate is lifted, and reduces the weight of the first object carrying block so as to facilitate the lifting of the rear end of the upper plate.
Preferably, a draw hook is fixed at the rear end of the upper plate; the drag hook comprises drag hook body and fixed block, the fixed block is fixed with the upper plate, the fixed block is formed with the holding tank, the fixed block upper end is equipped with the groove that passes through that makes holding tank and external intercommunication, the drag hook body includes hook portion, is located the perpendicular portion of hook portion lower extreme, is located the spacing portion of perpendicular portion lower extreme, perpendicular position in pass through the inslot, the arc surface is personally submitted to spacing portion upper end, through the inslot diameter by supreme increase gradually down, be greater than perpendicular portion external diameter through inslot end internal diameter, holding tank groove top constitute with spacing portion up end matched with arc surface.
The draw hook is arranged to facilitate connection of the upper plate and the liftable tension meter of the existing detection equipment, so that the rear end of the upper plate can be conveniently lifted, and magnetic force detection can be conveniently carried out. Wherein, the vertical part of drag hook can take place to incline relatively through the groove axis, and the drag hook can the adaptability slope to eliminate the influence that brings after the upper plate rotates minimum angle as far as possible.
Preferably, the number of the draw hooks is one and is positioned in the middle of the upper plate, and the number of the carrying block groups on the left side of the draw hooks is the same as that on the right side of the draw hooks. Wherein, the drag hook sets up in the upper plate middle part to control when guaranteeing the upper plate and promote balanced, in order to avoid the upper plate to take place to control the slope.
Preferably, the upper plate and the lower plate are matched with a level gauge, the first support column is in a bolt shape and is fixed with the upper plate through threads, the front end of the lower plate is provided with a second support column extending downwards, the second support column is in a bolt shape and is fixed with the lower plate through threads, and the rear end of the lower plate is erected on the support plate; the utility model discloses a support structure, including upper plate, hypoplastron, first support column, hypoplastron front end left and right sides all are equipped with a second support column.
The level may be external or fixed on the upper and lower plates. The level of setting up the spirit level in order can realizing upper plate and hypoplastron better to make carrying thing piece group department magnet or magnetic component position more accurate, magnetic attraction offsets the effect better. The first support column and the second support column can move up and down through threaded rotation, so that the structure of the invention is simpler, and the manufacturing and assembling cost is lower.
Preferably, the thickness between the front and the back of the lower end of the first support column is gradually reduced from top to bottom; the lower end of the first support column is conical; the lower end surface of the first supporting column is arranged in a circular arc surface-shaped structure; the lower end of the first support column is supported on the bottom plate or the lower plate, a positioning groove with an upward opening is formed in the end face of the upper end face of the bottom plate or the lower plate, the lower end of the first support column is always located in the positioning groove, and the width of the positioning groove is gradually increased from bottom to top. The lower end of the first support column is arranged so as to facilitate the rotation of the first support column. Wherein, the first supporting column is supported in the positioning groove and is not rotatably fixed on the bottom plate (the working table surface) or the lower plate through a hinge joint, so as to reduce the friction force when the upper plate rotates. Wherein. The bottom of the positioning groove can be provided with a circular arc surface to better reduce the friction force when the first supporting column swings.
Preferably, the length of the upper plate is at least five times as long as the length of the first carrier block in the front-rear direction. After the arrangement is adopted, the rear end of the upper plate is lifted, the front and rear displacement of the first carrying block is extremely small, and therefore the error of the detection result is small.
Preferably, the lifting assembly comprises a screw rod module, the screw rod module is provided with a sliding block capable of moving up and down, a shell of the tension meter is fixed with the sliding block, and the tension meter is a digital display tension meter. Adopt the lead screw module as lifting unit, the lifting accuracy is higher. Wherein, can adopt the lead screw module of hand formula, also can adopt motor drive's lead screw module. The tension meter is digital display, so that the tension meter is convenient for a tester to observe the front and back tension.
The invention has the advantage of improving the detection accuracy of the magnetic centering force.
Drawings
FIG. 1 is a schematic view of a carrying mechanism according to the present invention;
FIG. 2 is another schematic structural view of the loading mechanism of the present invention;
FIG. 3 is a schematic structural diagram of the present invention;
fig. 4 is a schematic structural view of the rear end of the upper plate at the position of the draw hook.
Detailed Description
The invention is further described below with reference to the figures and specific embodiments.
As shown in fig. 1 to 3, the magnetic centering force detecting apparatus of the present invention includes a tension measuring mechanism and a loading mechanism. The tension measuring mechanism includes a tension meter 91 and a lifting assembly 92 for lifting the tension meter 91. Carry thing mechanism and include upper plate 1 and hypoplastron 2 along the fore-and-aft direction setting, upper plate 1 is located hypoplastron 2 tops and is parallel to each other, and 1 front end of upper plate is equipped with downwardly extending's first support column 3, and tensiometer 91 is located 1 rear end of upper plate top, is connected with tensiometer 91 when 1 rear end of upper plate, and tensiometer 91 during the rebound, and 1 rear end of upper plate can use 3 lower extremes of first support column to upwards rotate as the center. Wherein, lifting unit 92 includes the lead screw module, and lead screw module 92 has the slider 93 that can reciprocate, and the casing of tensiometer 91 is fixed with slider 93, and tensiometer 91 is digital display tensiometer.
Be equipped with two year thing piece groups between upper plate rear end and hypoplastron rear end, two carry thing piece groups and set up along left right direction interval, every carries thing piece group and all includes a first year thing piece 4 and a second year thing piece 5, first year thing piece 4 is fixed with upper plate 1, second year thing piece 5 is fixed with hypoplastron 2, it is adjacent about first year thing piece 4 and the second year thing piece 5 of same year thing piece group, be formed with the first standing groove 41 that is used for placing the product of waiting to detect on first year thing piece 4, be formed with the second standing groove 51 that is used for placing the magnet for the detection on the second year thing piece 5. Wherein, the length of the upper plate 1 is ten times of the length of the first carrying block 4 along the front and back direction.
The first placing grooves 41 are not communicated with the second placing grooves 51, the two carrying block groups are arranged in bilateral symmetry, the two first carrying blocks 4 are located between the two second carrying blocks 5, the first placing groove 41 is arranged on the right side face of the left first carrying block 4, the second placing groove 51 is arranged on the left side face of the left second carrying block 5, the first placing groove 41 is arranged on the left side face of the right first carrying block 4, and the second placing groove 51 is arranged on the right side face of the right second carrying block 5.
A first connecting plate 42 is connected between the upper ends of the two first object carrying blocks 4 to form an n-shaped structure, a second object carrying plate 52 is connected between the lower ends of the two second object carrying blocks 5 to form a u-shaped structure, the first connecting plate 42 is fixed with the upper plate 1, the second connecting plate is fixed with the lower plate, and the second object carrying blocks are not in contact with the first connecting plate all the time. The lower end surface of the upper plate 1 is always positioned above the upper end surface of the second object carrying block 5, the first object carrying block 4 is always positioned on the upper side of the second connecting plate 52, and before the device is used, the first object carrying block 4 is supported on the upper end surface of the second connecting plate 52. In order to reduce the friction between the first object carrying block 4 and the second connecting plate 52, the lower end surface of the first object carrying block 4 may be set to be an arc surface structure.
The upper plate 1 and the lower plate 2 are both fitted with a level gauge 7. The left and right sides of the front end of the upper plate 1 are respectively provided with a first supporting column 3, and the left and right sides of the front end of the lower plate 2 are respectively provided with a second supporting column 8 extending downwards. The first supporting column 3 is in a bolt shape and is fixed with the upper plate 1 in a threaded manner, the second supporting column 8 is in a bolt shape and is fixed with the lower plate 2 in a threaded manner, and the rear end of the lower plate 2 is erected on the supporting plate 20. Wherein, the thickness between the front and back of first support column 3 lower extreme dwindles from top to bottom gradually, and 3 lower extremes of first support column are the toper, and 3 lower extremes of first support column personally submit the setting of circular arc surface form structure, and 3 lower extremes of first support column support on hypoplastron 2, and the up end of hypoplastron 2 is formed with the constant head tank of ascending opening, and 3 lower extremes of first support column are located the constant head tank all the time, and the width of constant head tank is crescent from bottom to top. Wherein, the table surface on which the worktable of the invention is placed is provided with a fixing groove for limiting the second supporting column 8.
As shown in the figures 1, 2 and 4, the rear end of the upper plate 1 is fixed with one draw hook 6, the draw hooks 6 are one and are positioned in the middle of the upper plate 1, and the two carrying block groups are bilaterally symmetrical by taking the draw hooks 6 as the center. The draw hook 6 is composed of a draw hook body and a fixing block 62, the fixing block 62 is fixed with the upper plate 1, the fixing block 62 is provided with a holding groove 63, the upper end of the fixing block 62 is provided with a through groove 64 which enables the holding groove 63 to be communicated with the outside, the draw hook body comprises a hook portion 611, a vertical portion 612 which is positioned at the lower end of the hook portion 611 and a limiting portion 613 which is positioned at the lower end of the vertical portion 612, the vertical portion 612 is positioned in the through groove 64, the upper end of the limiting portion 613 is an arc surface, the inner diameter of the through groove 64 is gradually increased from bottom to top, the inner diameter of the lower end of the through groove 64 is larger than the outer diameter of the vertical portion 612 and.
When the device is used, the distance L between the axis of the first support column and the draw hook is obtained by measuring in advance2Measuring to obtain the distance L between the axis of the first support column and the center of the product1. Respectively putting 2 same products to be detected into a first placing groove, and then upwards pulling the rear end of the upper plate for a certain distance by the existing detection equipment so as to enable the rear end of the upper plate to upwards overturn for 5 degrees and measure the tension F at the momentFront sideAnd then the upper plate is reset. Respectively placing a same magnet for detection in 2 second placing grooves, and then upwards pulling the rear end of the upper plate for a certain distance by the existing detection equipment so as to enable the rear end of the upper plate to upwards turn for 5 degrees and measure the tension F at the momentRear endFinally, the upper plate is reset and the product is removed.
First calculating the tensile force F2，F2＝FRear end-FFront sideThen carrying out magnetic centering force F of the tested product1Detection of (2): f1＝F2*L2/L1。
The invention has the advantage of improving the detection accuracy of the magnetic centering force.
Claims (10)
1. A magnetic centering force detection device is characterized by comprising a tension measurement mechanism and an object carrying mechanism, wherein the tension measurement mechanism comprises a tension meter and a lifting assembly used for lifting the tension meter, the object carrying mechanism comprises an upper plate and a lower plate which are arranged along the front-back direction, the upper plate is positioned above the lower plate, the tension meter is positioned above the rear end of the upper plate, the front end of the upper plate is provided with a first support column extending downwards, 2n object carrying block groups are arranged between the rear end of the upper plate and the rear end of the lower plate, the 2n object carrying block groups are arranged along the left-right direction at intervals, each object carrying block group comprises a first object carrying block and a second object carrying block, the first object carrying block is fixed with the upper plate, the second object carrying block is fixed with the lower plate, the first object carrying block and the second object carrying block of the same object carrying block group are adjacent to each other left and right, a first placing groove used for placing a product to be detected is formed on the first object carrying block, a second placing groove for placing a magnet for detection is formed on the second carrying block; when the rear end of the upper plate is connected with the tension meter and the tension meter moves upwards, the rear end of the upper plate can rotate upwards by taking the lower end of the first support column as the center.
2. The magnetic centering force detecting device according to claim 1, wherein n is 1, and the first placement groove and the second placement groove are not communicated with each other; the two carrying block groups are arranged in bilateral symmetry.
3. The magnetic centering force detecting device according to claim 1, wherein the lower end surface of the upper plate is always located above the upper end surface of the second carrier block;
a first connecting plate is connected between the upper ends of the first carrying blocks, a second carrying plate is connected between the lower ends of the second carrying blocks, the first connecting plate is fixed with the upper plate, the second connecting plate is fixed with the lower plate, and the second carrying blocks are not contacted with the first connecting plate all the time; the first carrying block is always positioned on the upper side of the second connecting plate.
4. The magnetic centering force detecting device according to claim 1, wherein the lower end surface of the first carrying block is in an arc-surface-shaped structure; or the lower end face of the first carrying block or a contact surface contacted with the lower end face of the first carrying block is provided with a yielding groove.
5. The magnetic centering force detecting device according to claim 1, wherein a drag hook is fixed at the rear end of the upper plate; the drag hook comprises drag hook body and fixed block, the fixed block is fixed with the upper plate, the fixed block is formed with the holding tank, the fixed block upper end is equipped with the groove that passes through that makes holding tank and external intercommunication, the drag hook body includes hook portion, is located the perpendicular portion of hook portion lower extreme, is located the spacing portion of perpendicular portion lower extreme, perpendicular position in pass through the inslot, the arc surface is personally submitted to spacing portion upper end, through the inslot diameter by supreme increase gradually down, be greater than perpendicular portion external diameter through inslot end internal diameter, holding tank groove top constitute with spacing portion up end matched with arc surface.
6. The device for detecting magnetic centering force according to claim 5, wherein the number of the drag hooks is one and is located in the middle of the upper plate, and the number of the loading block groups on the left side of the drag hook is the same as the number of the loading block groups on the right side of the drag hook.
7. The magnetic centering force detection device of claim 1, wherein the upper plate and the lower plate are equipped with a level gauge, the first support column is bolt-shaped and is fixed with the upper plate by screw thread, the front end of the lower plate is provided with a second support column extending downwards, the second support column is bolt-shaped and is fixed with the lower plate by screw thread, and the rear end of the lower plate is erected on the support plate; the utility model discloses a support structure, including upper plate, hypoplastron, first support column, hypoplastron front end left and right sides all are equipped with a second support column.
8. The magnetic centering force detecting device of claim 1, wherein the thickness between the front and rear of the lower end of the first support pillar gradually decreases from top to bottom; the lower end of the first support column is conical; the lower end surface of the first supporting column is arranged in a circular arc surface-shaped structure;
the lower end of the first support column is supported on the bottom plate or the lower plate, a positioning groove with an upward opening is formed in the end face of the upper end face of the bottom plate or the lower plate, the lower end of the first support column is always located in the positioning groove, and the width of the positioning groove is gradually increased from bottom to top.
9. The gyromagnetic force detection apparatus of claim 1, wherein the length of the upper plate is at least five times the length of the first mass in the fore-and-aft direction.
10. The magnetic centering force detection device according to claim 1, wherein the lifting assembly comprises a lead screw module, the lead screw module is provided with a slide block capable of moving up and down, a shell of the tension meter is fixed with the slide block, and the tension meter is a digital display tension meter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110121845.6A CN112858968B (en) | 2021-01-28 | 2021-01-28 | Magnetic return neutral force detection device |
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| CN202110121845.6A CN112858968B (en) | 2021-01-28 | 2021-01-28 | Magnetic return neutral force detection device |
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| JP2018026944A (en) * | 2016-08-10 | 2018-02-15 | 日置電機株式会社 | Measuring apparatus |
| DE102017109114A1 (en) * | 2017-04-27 | 2018-10-31 | Trafag Ag | Force sensor and force measuring method for measuring axial forces |
| CN111025207A (en) * | 2019-12-11 | 2020-04-17 | 中国科学院光电技术研究所 | Method and device for measuring static magnetic force |
| CN111443311A (en) * | 2020-06-02 | 2020-07-24 | 西安柯莱特信息科技有限公司 | Cantilever beam magnetic field sensor |
| CN214623005U (en) * | 2021-01-28 | 2021-11-05 | 浙江英洛华引力科技有限公司 | Magnetic force detection in return is with carrying thing mechanism |
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