Automatic measurement method for steel component dimensions

Abstract

The present invention discloses a method for automatically measuring the size of a steel component. The method uses an automatic measuring device for measuring the size of a steel component to measure the steel component. The method specifically comprises the following steps: Step 1: placing the measuring device on the surface of the steel component to be measured; Step 2: turning on the switch, the processor records the working time t, and the moving guide block accelerates from 0 to a speed V m Then do uniform motion; Step 3, move the guide block at a speed V m Enter the uniform speed zone with scale lines from the acceleration zone; the processor obtains the time when the moving guide block passes each scale line and the signal whether the moving guide block contacts the scale line; step 4, the processor performs steel component size measurement data analysis. This measurement method obtains the time and voltage signal when the moving guide block passes each scale line through the processor, thereby determining the number of holes in the measurement area on the steel component, the size of each hole, the spacing between adjacent holes, and the length of the steel component. This measurement method greatly improves the measurement efficiency.

Description

Technical Field

[0001] The invention relates to an automatic measurement method for steel component dimensions, belonging to the technical field of measurement. Background Art

[0002] The processing of steel components involves the measurement and acceptance of the finished product's appearance structural dimensions, opening dimensions, etc. The commonly used method for measuring steel components is manual steel ruler measurement, which is inefficient, has large manual errors, and cannot achieve digitalization and informatization of measurement data, resulting in low traceability of historical measurement data. At the same time, photogrammetry and 3D laser scanning are also used to measure the dimensions of steel components. However, it takes a lot of time to measure the serial numbers of large-sized steel components with holes, and the workload of later data processing is large. Summary of the invention

[0003] In view of the problems existing in the prior art of steel component measurement, such as high time consumption, low efficiency, large data processing workload, etc., the present invention provides a method for automatically measuring the size of steel components.

[0004] In order to solve the above technical problems, the present invention includes the following technical solutions:

[0005] A method for automatically measuring the size of a steel component, using an automatic measuring device for measuring the size of a steel component for measurement, the measuring device comprising a housing, and two magnets installed in the housing, a movable guide block, a power supply, a plurality of scale lines, a magnetic fluid, a voltmeter and a processor; the two magnets are arranged at intervals up and down, and the magnetic poles of the opposite surfaces are opposite, and a uniform magnetic field is formed between the two magnets; the movable guide block is arranged between the two magnets and can move parallel to the length direction of the housing in the magnetic field; the power supply provides current for the movable guide block; the scale lines are arranged at equal intervals along the length direction of the housing, one end of the scale lines extends into the magnetic field and overlaps with the moving track of the movable guide block in the vertical direction; the magnetic fluid is located above the scale lines, moves downward under the magnetic force of the steel component, and drives the scale lines to move, so that one end of the scale lines extending into the magnetic field can contact the movable guide block; no scale lines are arranged in the area with a length L at one end of the magnetic field; one end of the voltmeter is connected to the movable guide block, and the other end is connected to the scale lines; the processor is connected to the voltmeter signal for collecting and processing the voltage value of the voltmeter;

[0006] The method for automatically measuring the size of a steel member comprises the following steps:

[0007] Step 1: The moving guide block is located at the end of the uniform magnetic field where no scale line is set, and the measuring device is placed on the surface of the steel component to be measured. A magnetic force is generated between the magnetic fluid and the steel component, so that the magnetic fluid drives the scale line to move downward together, so that one end of the scale line is in the moving track of the moving guide block; at the hole of the steel component, the magnetic fluid is not subjected to the magnetic force, and the end of the scale line is still located above the moving track of the moving guide block;

[0008] Step 2: Turn on the switch, the processor records the working time t, the power supply generates current in the moving guide block, the moving guide block is accelerated by the Ampere force in the magnetic field, and the moving guide block accelerates from 0 to a speed V m Then do uniform motion;

[0009] Step 3: Move the guide block at a speed of V m From the acceleration zone, it enters the uniform speed zone with scale lines; the processor obtains the time when the moving guide block passes each scale line and the signal whether the moving guide block contacts the scale line;

[0010] Step 4. When the movable guide block moves to the end of the measuring area, the processor starts to analyze the steel component size measurement data. According to the time and signal of the movable guide block passing each scale line, the number of holes, the size of each hole, the spacing between adjacent holes, and the length of the steel component are obtained.

[0011] Furthermore, the method for automatically measuring the size of a steel member further comprises:

[0012] Step 5: After the processor completes the analysis of the steel component size measurement data, the measured steel component size data is sent to the cloud platform via the wireless network for data query and download.

[0013] Furthermore, the housing is also provided with a rotary switch, which is connected to the power supply, and has three gears: 0, 1, and 2. The circuit of gear 0 is disconnected, and there is no current in the circuit; the circuits of gears 1 and 2 are closed, and the current directions in the two gear circuits are opposite;

[0014] In step 1, the movable guide block is located at the end of the uniform magnetic field where no scale line is set, including: the rotary switch is rotated from gear 0 to gear 1, and current is generated in the movable guide block, so that the movable guide block is subjected to an ampere force in the magnetic field and moves toward the end of the uniform magnetic field where no scale line is set, until it moves to the end and stops due to being blocked, and then the rotary switch is placed in gear 2;

[0015] In step 2, turning on the switch specifically includes: rotating the rotary switch from level 0 to level 2.

[0016] Furthermore, the length of the acceleration zone is L, which is greater than or equal to the speed of the moving guide block accelerating from speed 0 to speed V m Movement distance L a ,satisfy:

[0017]

[0018]

[0019] V0=0;

[0020] V n =V m ;

[0021] Among them, n is the number of segments, dt is the speed V of the moving guide block. i-1 becomes V i The elapsed time, f is the frictional resistance, B is the magnetic field strength, l is the length of the moving guide block, U is the power supply voltage, R is the resistance of the moving guide block, and m is the mass of the moving guide block.

[0022] Further, in step three, the processor obtains the time when the moving guide block passes each scale line and the signal of whether the moving guide block contacts the scale line, specifically:

[0023] When the moving guide block touches the i-th scale line, the voltage is measured in the voltmeter, and the processor records the signal as 1 and the time t at this moment. i1 When the moving guide block does not touch the i-th scale line, the voltage value measured by the voltmeter is 0. According to the moving guide block movement speed and the scale line interval, the time t when the moving guide block passes the i-th scale line is obtained. i0 , the processor records the signal as 0.

[0024] Further, in step 4, the number of holes, the size of each hole, the spacing between adjacent holes, and the length of the steel member are obtained according to the time and signal of the moving guide block passing through each scale line, which specifically includes the following steps:

[0025] A1. The processor uses a number of adjacent 1 signals as a stiffening rib of the steel component and a number of adjacent 0 signals as a hole; the processor obtains the number of holes M along the length direction of the magnetic fluid;

[0026] A2. The processor takes the time T1 when the first signal is 1 1 The starting point of the steel member and the first stiffening rib, the moment when the first signal changes from 1 to 0 is T1 0 The end point of the first stiffener and the start point of the first hole of the steel member;

[0027] A3. The processor takes the time T when the jth signal changes from 1 to 0 j 0 is the end point of the jth stiffener and the starting point of the jth hole; the time T when the jth signal changes from 0 to 1 j 1is the end point of the jth hole and the starting point of the j+1th stiffener; where j = 1, 2, …, M;

[0028] A4. The processor changes from 1 to 0 at the moment when the M+1th signal As the end point of the M+1th stiffener and the end point of the steel member;

[0029] A5. The processor calculates the distance L of each stiffener segment j The distance S between each hole j , and the length Z of the steel member; where,

[0030]

[0031] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art: the automatic measurement method for steel component size provided by the present invention adopts the automatic measurement device for steel component size to measure the steel component, and the moving guide block accelerates in the acceleration zone at a speed V m The guide block moves at a constant speed and enters the scale line area. The processor obtains the time and voltage signal when the guide block passes each scale line, thereby determining the number of holes, the size of each hole, the spacing between adjacent holes, and the length of the steel member. The present application can realize the automatic measurement of the size of steel members, and can measure multiple hole sizes and hole spacing of steel members at one time, greatly improving the measurement efficiency, realizing the digitization and information management of data, improving the traceability of historical measurement data, and reducing the amount of calculation in data processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of a method for automatically measuring the size of a steel member in one embodiment of the present invention;

[0033] Figure 2 It is a schematic structural diagram of a device for automatically measuring the size of a steel member in one embodiment of the present invention;

[0034] Figure 3 for Figure 2 AA section view along the middle line;

[0035] Figure 4 is a cross-sectional view of an automatic measuring device in one embodiment of the present invention located on a steel member;

[0036] Figure 5 A schematic diagram of a movable guide block moving in a magnetic field in an embodiment of the present invention;

[0037] Figure 6 A schematic diagram of measuring the size of a steel component using a measuring device provided in one embodiment of the present invention.

[0038] The numbers in the figure are as follows:

[0039] 1-Steel component; 2-Measuring device;

[0040] 10- housing;

[0041] 20-magnet; 21-magnetic flux lines;

[0042] 30-moving guide block; 31-conductive track;

[0043] 40-power supply;

[0044] 50- scale line;

[0045] 60-magnetic fluid;

[0046] 70-voltmeter;

[0047] 80 - processor;

[0048] 90-Rotary switch. DETAILED DESCRIPTION

[0049] The following is a further detailed description of the automatic steel member size measurement method provided by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer in conjunction with the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0050] The automatic steel component size measurement method provided in this embodiment uses an automatic steel component size measurement device to measure the steel component. Figures 2 to 4 As shown, the measuring device includes a housing 10 , and two magnets 20 installed in the housing 10 , a moving guide block 30 , a power supply 40 , a plurality of scale lines 50 , a magnetic fluid 60 , a voltmeter 70 and a processor 80 .

[0051] The two magnets 20 are arranged at intervals in the upper and lower parts, and are fixed on the inner side of the top and the inner side of the bottom of the housing 10, respectively, and the magnetic poles of the opposite surfaces are opposite, and the magnetic flux lines 21 between the two magnets 20 are parallel, forming a uniform constant magnetic field. The moving guide block 30 is arranged between the two magnets 20, and can move parallel to the length direction of the housing 10 in the magnetic field. The power supply 40 provides current to the moving guide block 30.

[0052] Combination Figure 1 and Figure 2 As shown, the scale lines 50 are arranged at equal intervals along the length direction of the housing 10, and one end of the scale line 50 extends into the magnetic field and overlaps with the moving track of the moving guide block 30 in the vertical direction. Figures 1 to 3As shown, the magnetic fluid 60 is located above the scale line 50 , and moves downward under the magnetic force of the steel component 1 , driving the scale line 50 to move, so that the end of the scale line 50 extending into the magnetic field can contact the moving guide block 30 .

[0053] The area with a length of L at one end of the magnetic field is not provided with a scale line 50. This area is the acceleration area of ​​the moving guide block 30. The speed of the moving guide block 30 is accelerated from 0 to V m The area of ​​the scale line 50 is the uniform speed area, and the moving guide block 30 always moves at a speed of V m move.

[0054] One end of the voltmeter 70 is connected to the movable guide block 30 , and the other end is connected to the scale line 50 ; the processor 80 is connected to the voltmeter 70 for signal collection and processing of the voltage value of the voltmeter 70 .

[0055] It should be noted that, combined with Figures 2 to 5 As shown, the moving guide block 30 will be subjected to an Ampere force F in a uniform magnetic field, where F=BIl, where B is the magnetic field strength generated by the magnet 20, I is the current in the moving guide block 30, and l is the length of the moving guide block 30. At the same time, the moving guide block 30 will also be subjected to the hindering effect of the friction resistance f. The moving guide block 30 will move at an accelerated speed under the action of the Ampere force F and the friction resistance f. During the movement of the moving guide block 30, an induced current Ig in the opposite direction to I will be generated. The Ampere force F=B(I-Ig)l on the moving guide block 30 in the acceleration zone will decrease as the moving speed of the moving guide block 30 increases until the acceleration reaches 0 and the moving guide block 30 will maintain the maximum speed V m Move at a constant speed.

[0056]

[0057]

[0058] Where, B—magnetic field strength;

[0059] l—the length of the moving guide block;

[0060] U—power supply voltage;

[0061] R—resistance of moving guide block;

[0062] Ig—induced current;

[0063] f—friction resistance when the moving guide block moves;

[0064] V m - The speed at which the moving guide block 30 moves uniformly in the magnetic field.

[0065] Furthermore, the scale line 50 is set in the uniform speed area of ​​the moving guide block 30, and the scale line 50 is not set in the acceleration area. The length of the acceleration area is L, which is greater than or equal to the moving distance L during the acceleration process. a .L a It can be determined in the following ways:

[0066] The guide block 30 moves at a speed V at a certain unit time dt. i-1 becomes V i , V i Satisfies the following formula:

[0067] V0=0;V n =V m ;

[0068] From this we can get: or

[0069] In a specific embodiment, a conductive track 11 is further provided in the housing 10 . The conductive track 11 is provided on a side of the movable guide block 30 along a length direction of the housing 10 . The movable guide block 30 can slide along the conductive track 11 .

[0070] In a specific embodiment, the width of the movable guide block 30 is half of the spacing between the scale lines 50. For example, the spacing between the scale lines 50 is 1 mm, and the width of the movable guide block 30 is 0.5 mm.

[0071] In a specific embodiment, the housing 10 is further provided with a rotary switch 90, the rotary switch 90 is connected to the power supply 40, and the rotary switch 90 is provided with three gears for controlling the switch and current direction of the power supply 40. The rotary switch 90 is connected to the power supply 40 and is used to control the switch and direction of the power supply 40. Specifically, the rotary switch 90 is provided with three gears, 0, 1, and 2, the circuit of gear 0 is disconnected, and there is no current in the circuit; the circuit of gear 1 and gear 2 is closed, and the current directions in the two gear circuits are opposite.

[0072] In a specific embodiment, the housing 10 is in the shape of a ruler or a tape measure, and the housing 10 itself can also be used as a measuring tool.

[0073] The following will specifically combine Figures 1 to 6 , the automatic measurement method of the steel component size is further introduced. The automatic measurement method of the steel component size comprises the following steps:

[0074] Step 1: The moving guide block 30 is located at one end of the uniform magnetic field where no scale line 50 is set. The measuring device 2 is placed on the surface of the steel component to be measured. A magnetic force is generated between the magnetic fluid 60 and the steel component, so that the magnetic fluid 60 drives the scale line 50 to move downward together, and one end of the scale line 50 is in the moving track of the moving guide block 30. At the hole of the steel component, the magnetic fluid 60 is not subjected to the magnetic force, and the end of the scale line 50 is still located above the moving track of the moving guide block 30.

[0075] Step 2: Turn on the switch, the processor 80 starts to record the working time t, the power supply 40 generates a current I in the movable guide block 30, and the movable guide block 30 accelerates in the magnetic field under the action of the Ampere force F and the friction resistance f, and the movable guide block 30 accelerates from 0 to a speed V m It should be noted that as the movement speed V increases, the induced current Ig in the moving guide block 30 increases, causing the acceleration to gradually decrease until the acceleration is 0, and the moving guide block 30 reaches the maximum speed V m After uniform motion;

[0076] Step 3: Move the guide block 30 at a speed V m From the acceleration zone, the moving guide block 30 enters the uniform speed zone with the scale line 50; the processor 80 obtains the time when the moving guide block 30 passes each scale line 50 and the signal whether the moving guide block 30 contacts the scale line 50;

[0077] Step 4. When the movable guide block 30 moves to the end of the measuring area, the processor 80 starts to analyze the steel component size measurement data. According to the time and signal when the movable guide block 30 passes through each scale line 50, the number of holes, the size of each hole, the spacing between adjacent holes, and the length of the steel component are obtained.

[0078] In a specific embodiment, the automatic steel component size measurement method preferably includes step five, after the processor 80 analyzes the steel component size measurement data, the measured steel component size data is sent to the cloud platform via a wireless network for data query and download.

[0079] In a specific embodiment, the housing 10 is further provided with a rotary switch 90, which is connected to the power source 40. The rotary switch 90 has three gears: 0, 1, and 2. The circuit of gear 0 is disconnected, and there is no current in the circuit; the circuit of gears 1 and 2 is closed, and the current directions in the two gear circuits are opposite.

[0080] In a specific embodiment, in step 3, the processor 80 obtains the time when the moving guide block 30 passes through each scale line 50 and the signal of whether the moving guide block 30 contacts the scale line 50, specifically: when the moving guide block 30 contacts the i-th scale line 50, the voltage is measured in the voltmeter 70, and the processor 80 records the signal as 1, and records the time t at this moment. i1When the moving guide block 30 does not touch the i-th scale line 50, the voltage value measured by the voltmeter 70 is 0, and the time t for the moving guide block 30 to pass the i-th scale line 50 is obtained according to the moving speed of the moving guide block 30 and the interval between the scale lines 50. i0 , processor 80 records the signal as 0.

[0081] In a specific embodiment, the housing 10 is further provided with a rotary switch 90, the rotary switch 90 is connected to the power supply 40, and the rotary switch 90 is provided with three gears of 0, 1, and 2, the circuit of gear 0 is disconnected, and there is no current in the circuit; the circuits of gears 1 and 2 are closed, and the current directions in the two gear circuits are opposite; in step 1, the movable guide block 30 is located at the end of the uniform magnetic field where the scale line 50 is not provided, comprising the following steps:

[0082] The rotary switch 90 rotates from gear 0 to gear 1, and current is generated in the movable guide block 30, so that the movable guide block 30 is subjected to the Ampere force in the magnetic field and moves toward the end of the uniform magnetic field where no scale line 50 is set, until it moves to the end and stops due to obstruction.

[0083] In a specific embodiment, according to the time and signal of the moving guide block 30 passing each scale line 50, the number of holes, the size of each hole, the spacing between adjacent holes, and the length of the steel component are obtained, which specifically includes the following steps:

[0084] A1. The processor 80 uses a number of adjacent 1 signals as a stiffening rib of the steel member and a number of adjacent 0 signals as a hole; the processor 80 obtains the number M of holes along the length direction of the magnetic fluid 60;

[0085] A2. The processor 80 takes the time T1 when the first signal is 1 1 The starting point of the steel member and the first stiffening rib, the moment when the first signal changes from 1 to 0 is T1 0 The end point of the first stiffener and the start point of the first hole of the steel member;

[0086] A3. The processor 80 takes the jth time when the signal changes from 1 to 0 T j 0 is the end point of the jth stiffener and the starting point of the jth hole; the time T when the jth signal changes from 0 to 1 j 1 is the end point of the j-th hole and the starting point of the j+1-th stiffener; where j = 1, 2, …, M;

[0087] A4. The processor 80 changes the M+1th signal from 1 to 0 at the moment As the end point of the M+1th stiffener and the end point of the steel member;

[0088] A5. Processor 80 calculates the distance L of each stiffening rib j (i.e. the spacing of the holes) and the distance S between the holes j ; and the length Z of the steel member; where,

[0089]

[0090] In a specific embodiment, Figure 6 As shown, there are two holes on the steel component, and the processor will obtain the time T1 of the starting point of the steel component. 1 (also the starting time of the first stiffener), the starting time of the first hole T1 0 (also the end time of the first stiffener) and the start time of the second stiffener T2 1 (also the end time of the first hole), the starting time of the second hole T2 0 (also the end time of the second stiffener), the start time of the third stiffener T3 1 (also the end time of the third hole), the end time of the third stiffener T3 0 (Also the end time of the steel structure).

[0091] In summary, the automatic steel component size measurement method provided in this embodiment uses an automatic steel component size measurement device to measure the steel component, and the moving guide block 30 is accelerated in the acceleration zone at a speed V m The processor 80 obtains the voltage signal time when the moving guide block 30 passes through each root scale line 50, thereby determining the number of holes, the size of each hole, the spacing between adjacent holes, and the length of the steel member. The present application can realize the automatic measurement of the size of the steel member, and can measure multiple hole sizes and hole spacing of the steel member at one time, which greatly improves the measurement efficiency, realizes the digitization and information management of data, improves the traceability of historical measurement data, and reduces the amount of calculation in data processing. The advantage is more obvious in the measurement of large-sized porous steel members.

[0092] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for automatically measuring the size of a steel component, characterized in that: The measurement is performed using an automatic measuring device for the size of a steel component, the measuring device comprising a housing, and two magnets installed in the housing, a movable guide block, a power supply, a plurality of scale lines, a magnetic fluid, a voltmeter and a processor; the two magnets are arranged at intervals up and down, and the magnetic poles of the opposite surfaces are opposite, and a uniform magnetic field is formed between the two magnets; the movable guide block is arranged between the two magnets, and can move parallel to the length direction of the housing in the magnetic field; the power supply provides current for the movable guide block; the scale lines are arranged at equal intervals along the length direction of the housing, and one end of the scale lines overlaps with the moving trajectory of the movable guide block in the vertical direction; the magnetic fluid is located above the scale lines, and moves downward under the action of the magnetic force of the steel component, and drives the scale lines to move, so that the end of the scale lines extending into the magnetic field can contact the movable guide block; no scale lines are arranged in the area with a length of L at one end of the magnetic field; one end of the voltmeter is connected to the movable guide block, and the other end is connected to the scale lines; the processor is connected to the voltmeter signal for collecting and processing the voltage value of the voltmeter; The method for automatically measuring the size of a steel member comprises the following steps: Step 1: The moving guide block is located at the end of the uniform magnetic field where no scale line is set, and the measuring device is placed on the surface of the steel component to be measured. A magnetic force is generated between the magnetic fluid and the steel component, so that the magnetic fluid drives the scale line to move downward together, so that one end of the scale line is in the moving track of the moving guide block; At the hole of the steel component, the magnetic fluid is not subjected to magnetic force, and the end of the scale line is still above the moving track of the moving guide block; Step 2: Turn on the switch, the processor records the working time t, the power supply generates current in the moving guide block, the moving guide block is accelerated by the Ampere force in the magnetic field, and the moving guide block accelerates from 0 to a speed V m Then do uniform motion; Step 3: Move the guide block at a speed of V m From the acceleration zone, enter the uniform speed zone with scale lines; The processor obtains the time when the moving guide block passes each scale line and the signal whether the moving guide block contacts the scale line; Step 4. When the movable guide block moves to the end of the measuring area, the processor starts to analyze the steel component size measurement data. According to the time and signal of the movable guide block passing each scale line, the number of holes, the size of each hole, the spacing between adjacent holes, and the length of the steel component are obtained.

2. The method for automatically measuring the size of a steel member according to claim 1, characterized in that: The method for automatically measuring the size of a steel member further comprises: Step 5: After the processor completes the analysis of the steel component size measurement data, the measured steel component size data is sent to the cloud platform via the wireless network for data query and download.

3. The automatic steel member size measurement method according to claim 1 or 2, characterized in that: The housing is also provided with a rotary switch, which is connected to the power supply. The rotary switch has three gears: 0, 1, and 2. The circuit of gear 0 is disconnected and there is no current in the circuit; the circuits of gears 1 and 2 are closed, and the current directions in the two gear circuits are opposite. In step 1, the movable guide block is located at the end of the uniform magnetic field where no scale line is set, including: the rotary switch is rotated from gear 0 to gear 1, and a current is generated in the movable guide block, so that the movable guide block is subjected to an ampere force in the magnetic field and moves toward the end of the uniform magnetic field where no scale line is set, until it moves to the end and stops due to being blocked, and then the rotary switch is placed in gear 2; In step 2, turning on the switch specifically includes: rotating the rotary switch from level 0 to level 2.

4. The automatic steel member size measurement method according to claim 1 or 2, characterized in that: The length of the acceleration zone is L, which is greater than or equal to the speed of the moving guide block accelerating from speed 0 to speed V m Movement distance L a ,satisfy: V0＝0； V n =V m ; Among them, n is the number of segments, dt is the speed V of the moving guide block. i-1 becomes V i The elapsed time, f is the frictional resistance, B is the magnetic field strength, l is the length of the moving guide block, U is the power supply voltage, R is the resistance of the moving guide block, and m is the mass of the moving guide block.

5. The automatic steel member size measurement method according to claim 1 or 2, characterized in that: In step 3, the processor obtains the time when the moving guide block passes each scale line and the signal of whether the moving guide block contacts the scale line, specifically: When the moving guide block touches the i-th scale line, the voltage is measured in the voltmeter, and the processor records the signal as 1 and the time t at this moment. i1 When the moving guide block does not touch the i-th scale line, the voltage value measured by the voltmeter is 0. According to the moving guide block movement speed and the scale line interval, the time t when the moving guide block passes the i-th scale line is obtained. i0 , the processor records the signal as 0.

6. The method for automatically measuring the size of a steel member according to claim 5, characterized in that: In step 4, the number of holes, the size of each hole, the spacing between adjacent holes, and the length of the steel member are obtained according to the time and signal of the moving guide block passing each scale line, which specifically includes the following steps: A1. The processor uses a number of adjacent 1 signals as a stiffening rib of the steel component and a number of adjacent 0 signals as a hole; the processor obtains the number of holes M along the length direction of the magnetic fluid; A2. The processor takes the time T1 when the first signal is 1 1 The starting point of the steel member and the first stiffening rib, the moment when the first signal changes from 1 to 0 is T1 0 The end point of the first stiffener and the start point of the first hole of the steel member; A3. The processor takes the time T when the jth signal changes from 1 to 0 j 0 is the end point of the jth stiffener and the starting point of the jth hole; the time T when the jth signal changes from 0 to 1 j 1 is the end point of the j-th hole and the starting point of the j+1-th stiffener; where j = 1, 2, …, M; A4. The processor changes from 1 to 0 at the moment when the M+1th signal As the end point of the M+1th stiffener and the end point of the steel member; A5. The processor calculates the distance L of each stiffener segment j The distance S between each hole j , and the length Z of the steel member; where,

Images