A hot-rolled steel sheet thickness measurement system

Abstract

The present application relates to the technical field of hot-rolled steel plate thickness measurement, and particularly relates to a hot-rolled steel plate thickness measurement system. The clamping assembly clamps the laser when the thickness measurement unit moves, thereby avoiding the shaking of the laser caused by inertia. A second reference surface is arranged in one of the clamping blocks of the clamping assembly, and the second reference surface is perpendicular to the first reference surface. When the second reference surface is attached to the laser in a vertical state at a specific position, the laser is clamped by the second clamping block, so that the laser can always be perpendicular to the first reference surface. The second clamping block is away from the laser before the first clamping block, and the angle of the laser swing is twice the inclination angle. The system can obtain the inclination angle by dividing the offset of the laser coordinates and the reference coordinates by two and multiplying the energy loss coefficient when the laser swings. The direction adjusting assembly can adjust the fixed connection part according to the calculated inclination angle, so as to shorten the overall measurement time.

Description

Technical Field

[0001] The invention relates to the technical field of hot-rolled steel plate thickness measurement, in particular to a hot-rolled steel plate thickness measurement system. Background Art

[0002] Heavy-duty hot-rolled steel plate thickness is typically measured using radioactive radiation. The principle is that radioactive radiation has high penetrating power and can penetrate heavy-duty hot-rolled steel plate, while hot-pressed steel plate absorbs some of the radiation. By comparing the energy attenuation of the radiation before and after impact with the steel plate and combining it with calibration data (mapping parameters such as thickness and temperature against absorption), the plate thickness can be calculated.

[0003] Among them, in the online real-time measurement of steel plate thickness, in order to save costs, a set of thickness measuring devices will be used to measure different positions of the steel plate. Therefore, the thickness measuring device needs to be movable. However, during the movement, the thickness measuring device (radiation source receiving part and radiation source emitting part) may be deflected, resulting in the two being unable to be coaxially aligned, which will cause the radioactive rays to not fully enter the radiation source receiving part. The radiation source receiving part will also regard the part of the energy that does not enter the radiation source receiving part as the loss energy when penetrating the steel plate, resulting in the measurement result being thicker than the actual thickness value.

[0004] To address these issues, a technical solution for a hot-rolled plate thickness measurement system has been developed in the field. This system utilizes a collimation mechanism based on the principle of the vertical line of gravity. A flexibly suspended laser indicates the direction of gravity. The position of the laser's impact point determines the tilt of the radiation source mounting base (i.e., the loading unit). The tilting mechanism then adjusts the angle of the loading unit, which holds the radiation source. However, in actual use, the following issues have been identified: as the loading unit moves along the guide rails, the suspended laser swings violently due to inertia, requiring the system to come to a complete standstill before stable coordinates can be obtained. Only then can the tilt of the loading unit be determined based on these stable coordinates, allowing for thickness measurement. However, production lines cannot tolerate downtime, resulting in a lack of real-time performance and lag errors in thickness measurements. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the prior art, the present invention provides a hot-rolled steel plate thickness measurement system, comprising:

[0006] A pair of loading parts sliding synchronously along two guide rails;

[0007] a thickness measuring unit comprising a radiation source emitting portion and a radiation source receiving portion respectively installed in the pair of loading portions;

[0008] Each of the loading parts is also equipped with a fixed connection part, a direction detection component and a clamping component;

[0009] The fixed connection portion has a first reference surface perpendicular to the direction of gravity, and the radiation source emitting portion or the radiation source receiving portion is fixedly installed on the fixed connection portion;

[0010] The direction detection component includes a laser, a flexible connector and a laser sensing part;

[0011] One end of the flexible connector is fixedly connected to the first reference surface of the fixed connection portion, and the other end is fixedly connected to the laser, so that the laser is suspended under the action of gravity and the laser beam emitted by the laser is along the direction of gravity;

[0012] The laser sensing unit is fixedly mounted on the loading unit and is used to receive the laser and generate position coordinates;

[0013] Wherein, the clamping assembly is connected to the fixed connection portion and has:

[0014] Clamping state: during the movement of the loading part, the laser is clamped so that the laser remains perpendicular to the first reference plane;

[0015] Release state: When the loading part stops moving, the fixation of the laser is released.

[0016] Furthermore, the clamping assembly includes:

[0017] a first clamping block, wherein the clamping surface of the first clamping block for clamping the laser is a second reference surface;

[0018] a second clamping block, which is provided with an elastic structure;

[0019] The first clamping block has a first reference position. When the first clamping block moves until the second reference surface thereof contacts and abuts against the suspended laser, and the laser beam is perpendicular to the first reference surface of the fixed connection portion, the position of the first clamping block is the first reference position.

[0020] Wherein, in the clamping state: the first clamping block is maintained at the first reference position, and the second clamping block is pressed against the laser under the action of the elastic structure, so that the laser is fixedly clamped between the first clamping block and the second clamping block;

[0021] In the released state: the second clamp first overcomes the force of the elastic structure and moves away from the laser to release the clamping, and then the first clamp moves away from the laser to restore the laser to a suspended state.

[0022] Furthermore, it also includes a data processing module;

[0023] The laser sensing unit is provided with a reference coordinate, and when the first reference plane is perpendicular to the laser beam, the laser beam irradiation position is the reference coordinate;

[0024] The laser sensing unit is used to record the maximum offset distance of the laser coordinate relative to the reference coordinate;

[0025] The data processing module is configured as follows:

[0026] Calculating the swing angle of the laser according to the maximum offset distance;

[0027] The tilt angle is calculated based on the product of the swing angle and a preset energy loss coefficient.

[0028] Furthermore, the clamping assembly further includes a third clamping block;

[0029] The third clamping block and the first clamping block act on the laser in the same direction;

[0030] The second clamping block and the third clamping block clamp the laser before the first clamping block;

[0031] When the first clamping block reaches the first reference position, the third clamping block is separated from the laser.

[0032] Furthermore, the clamping surface of the third clamping block for the laser is provided with a flexible layer.

[0033] Furthermore, the clamping assembly includes:

[0034] A first driving mechanism independently drives the first clamping block to move;

[0035] A second driving mechanism independently drives the second clamping block to move;

[0036] A third driving mechanism independently drives the third clamping block to move;

[0037] Each driving mechanism is respectively equipped with an independent driving motor.

[0038] Furthermore, the fixed connection portion is provided with a blocking portion;

[0039] The blocking portion has a third reference surface perpendicular to the moving direction of the first clamping block, which is used to define the first reference position of the first clamping block.

[0040] Furthermore, the blocking portion has two third reference surfaces, which are in the same plane and respectively located on both sides of the laser; the two sides of the laser are: the direction perpendicular to the movement direction of the first clamp in the horizontal direction.

[0041] Furthermore, when the third clamping block and the second clamping block clamp the laser, the distance between the clamping surface of the third clamping block for the laser and the clamping surface of the second clamping block is L1;

[0042] The distance from the third reference plane to the clamping surface of the second clamping block is L2;

[0043] Among them, L2>L1.

[0044] Furthermore, the first driving mechanism is provided with a pressure sensor;

[0045] The pressure sensor is configured as follows:

[0046] monitoring the motion pressure of the first clamp;

[0047] When the measured pressure exceeds a preset threshold, it is determined that the first clamping block has reached the first reference position.

[0048] The beneficial effects of the present invention are reflected in that, in the measurement system of the present application, when the loading part drives the laser to move, the laser and the fixed connection part are kept fixed by the clamping assembly, effectively preventing the laser from shaking significantly due to inertia, which leads to prolonged measurement time. Furthermore, a second reference plane is set in a clamping block in the clamping assembly. When the second reference plane is aligned with the laser in a vertical state at a specific position, the laser is clamped by the second clamping block to ensure that the laser can always be in a perpendicular state to the first reference plane. Therefore, after the loading part tilts relative to the direction of gravity, the laser will also tilt at the same angle relative to the direction of gravity, and the laser coordinates remain aligned with the reference coordinates. Finally, the second clamp moves away from the laser before the first clamp and swings toward one side. Without considering energy loss, the laser swing angle is twice the tilt angle. The system can obtain the tilt angle by dividing the offset between the laser coordinate and the reference coordinate when the laser swings by two and then multiplying it by the energy loss coefficient. The direction adjustment component can adjust the fixed connection part according to the calculated tilt angle during the laser swing process without waiting for the laser to stop swinging, thereby shortening the overall measurement time. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a schematic diagram of the three-dimensional structure of a hot-rolled steel plate thickness measurement system;

[0050] Figure 2 This is a schematic diagram of the three-dimensional structure of a hot-rolled steel plate thickness measurement system provided by the present invention;

[0051] Figure 3 A top view of the clamping assembly provided by the present invention;

[0052] Figure 4 This is a schematic cross-sectional view of a hot-rolled steel plate thickness measurement system provided by the present invention;

[0053] Figure 5 Schematic diagram of the second clamping block and the third clamping block clamping the laser;

[0054] Figure 6 A schematic diagram of the first clamp and the second clamp clamping the laser;

[0055] Figure 7 This is a schematic diagram of the laser's swing after the second clamp is removed from the laser when tilt occurs.

[0056] Figure markings: 01, steel plate; 02, frame; 03, guide rail; 04, loading part; 05, radiation source emitting part; 06, radiation source receiving part; 11, fixed connection part; 111, first reference plane; 12, direction detection component; 121, laser; 122, flexible connection member; 123, laser sensing part; 13, clamping assembly; 131, first clamping block; 1311, second reference plane; 132, second clamping block; 133, third clamping block; 134, first driving mechanism; 1341, pressure sensor; 135, second driving mechanism; 136, third driving mechanism; 14, blocking part; 141, third reference plane; 15, direction adjustment component. DETAILED DESCRIPTION

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0058] Example 1

[0059] Reference Figure 1-Figure 7 .

[0060] A hot-rolled steel plate thickness measurement system comprises a frame 02 provided with two guide rails 03 located at both ends of a steel plate 01 in the thickness direction; a pair of loading sections 04 that slide synchronously along the two guide rails 03; and a thickness measurement unit comprising a transmitter and a receiver, respectively installed in the pair of loading sections 04.

[0061] Each of the loading parts 04 is also equipped with a fixed connection part 11, a direction detection component 12 and a clamping component 13;

[0062] The fixed connection portion 11 has a first reference surface 111 perpendicular to the direction of gravity, and the radiation source emitting portion 05 or the radiation source receiving portion is fixedly installed on the fixed connection portion 11;

[0063] The direction detection component 12 includes a laser 121, a flexible connector 122 and a laser sensing unit 123;

[0064] One end of the flexible connector 122 is fixedly connected to the first reference surface 111 of the fixed connection portion 11, and the other end is fixedly connected to the laser 121, so that the laser 121 is suspended under the action of gravity and the laser beam emitted by the laser 121 is along the direction of gravity;

[0065] The laser sensor 123 is fixedly mounted on the loading portion and is used to receive the laser and generate position coordinates;

[0066] The clamping assembly 13 is connected to the fixed connection portion 11 and has:

[0067] Clamping state: During the movement of the loading unit 04 , the laser 121 is clamped so that the laser remains perpendicular to the first reference surface 111 ;

[0068] Release state: When the loading unit 04 stops moving, the laser 121 is released from being fixed.

[0069] The flexible connecting member 122 may be a rope made of fiber material.

[0070] The measurement of steel plate 01 requires testing at multiple locations to ensure the consistency of the thickness of the entire steel plate 01. Therefore, the radiation source emitting unit 05 and the radiation source receiving unit 06 need to be frequently moved. In this application, the laser 121 is suspended from the first reference plane 111 by a flexible connector 122. Since the direction of gravity is immutable, the laser 121 will emit along the direction of gravity when not affected by other external forces. The sensor plane of the laser sensor 123 is parallel to the first reference plane 111. When the first reference plane 111 is perpendicular to the direction of gravity, the laser is perpendicular to the laser sensor 123 and can be irradiated at the reference coordinate. If the fixed connection 11 tilts, the first reference plane 111 and the sensing plane of the laser sensor 123 will no longer be perpendicular to the direction of gravity. However, the laser will still be perpendicular to the direction of gravity. In this case, the laser coordinate of the laser irradiated on the laser sensor 123 will deviate from the reference coordinate. At this time, the system determines that the radiation source emitting unit 05 or the radiation source receiving unit 06 needs to be corrected. The radiation source emitting part 05 and the radiation source receiving part 06 are perpendicular to the first reference plane 111. When the first reference plane 111 is parallel to the horizontal plane, the radiation source emitting part 05 and the radiation source receiving part 06 are also parallel to the direction of gravity.

[0071] However, the radiation source emitting unit 05 and the radiation source receiving unit 06 need to be frequently moved, while the laser 121 is suspended and not fixed. Therefore, during the movement process, the laser 121 will experience significant shaking due to inertia, and this shaking will take several minutes to stop. Only when the laser 121 stops shaking can it be determined whether the laser coordinates are irradiated at the reference coordinates. This results in very slow system correction.

[0072] In this regard, the present embodiment proposes using a clamping assembly 13 to pre-fix the laser 121 and then release the laser 121 to avoid shaking caused by inertia during movement.

[0073] However, what is needed in the entire measurement system is a very precise alignment, and the laser coordinates and the reference coordinates need to be aligned at the pixel level. The clamping assembly 13 fixes the laser 121, and it is very easy to move the laser 121, resulting in slight shaking; and the clamping center of the clamping assembly 13 is difficult to align with the center of the laser 121; and the clamping block of the clamping assembly 13 must have an elastic structure to avoid the clamping block and the laser 121 from hard contact and wear of the laser 121. In general, the elastic structure is only a rubber pad provided on the clamping surface of the clamping block, and the deformation of the rubber pad can just adapt to the laser Regarding the size of the laser 121, it is worth noting that when the clamp releases the laser 121, it is impossible for the clamps on the left and right sides to leave the laser 121 completely synchronously. The clamps must leave the laser 121 in a certain order, and then the clamp that leaves the laser 121 (the force of elastic deformation recovery) will push the laser 121 to swing toward the opposite side of the clamp. This swing is relatively slight, but it still takes a certain amount of time to ensure that the laser 121 is stationary. When measuring the steel plate 01, the measurement position needs to be changed many times, so this waiting time will be magnified several times, resulting in a serious increase in the measurement time.

[0074] In response to the above problems, this embodiment further improves the clamping assembly 13.

[0075] Specifically, the clamping assembly 13 in the present application includes a first clamping block 131 and a second clamping block 132, wherein the first clamping block 131 has a second reference surface 1311. The side wall of the laser 121 has two planes parallel to the second reference surface 1311, one facing the first clamping block 131 and the other facing the second clamping block 132. This allows the laser 121 to be aligned with the second reference surface 1311. When the laser 121 and the second reference surface 1311 are aligned, the laser is perpendicular to the first reference surface 111. The second clamping block 132 is provided with an elastic structure, for example, a rubber layer or a spring is provided in the second clamping block 132, and the laser 121 is squeezed by the elastic force. After the device moves to the corresponding measurement position, the second clamping block 132 first leaves the laser 121, while the first clamping block 131 does not move. The first clamping block 131 provides support for the laser 121 and balances the elastic force of the position of the second clamping block 132 to keep the laser 121 still. At this time, if the device does not tilt at all, then the second clamping block 132 leaves the laser 121, and the laser 121 does not shake at all, then the radiation source emitting unit 05 and the radiation source receiving unit 06 can directly perform measurement.

[0076] If the device tilts, the laser 121 may swing toward the second clamping block 132. Figure 7 As shown, (for the sake of convenience of discussion, the end close to the first clamping block 131 is defined as the front end, the end close to the second clamping block 132 is defined as the rear end, and the two ends perpendicular to them are the left end and the right end respectively) it is obvious that this is because the rear end of the first reference surface 111 (the end close to the second clamping block 132) is lower than the front end (the end close to the first clamping block 131), therefore, the direction adjustment component 15 can intervene in advance to raise the rear end of the first reference surface 111 or lower the front end before the laser 121 swings back and forth.

[0077] The reason why the present application can make the direction adjustment component 15 start adjusting before the laser 121 stops swinging is that if the laser 121 tilts toward the rear end, then after the second clamp 132 leaves the laser 121, the laser 121 swings toward the second clamp 132. If there is an ideal environment without resistance, according to the law of conservation of energy, Figure 7 As shown ( Figure 7 The laser 121 shown by the dashed line in the middle represents the maximum position to which the laser 121 can swing under ideal conditions. The lasers 121 shown by the solid and dashed lines are symmetrical along the direction of gravity in the figure. Then, the laser 121 can swing to the same tilt angle on the opposite side, that is, the swing angle should be twice the tilt angle. However, in reality, there are many energy losses, such as friction between the flexible connection member 122 and the fixed connection member 11, and air friction. Therefore, the tilt angle of the swing position will be smaller than the initial tilt angle. These energy losses are fixed parameters and do not change with the tilt angle of the laser 121. Therefore, the system sets the energy loss as a fixed coefficient. By multiplying the tilt angle by the coefficient, the tilt angle of the initial swing to the other side can be obtained. Accordingly, the system can determine the maximum angle of the initial swing based on the tangent function and the maximum offset distance of the laser coordinates during the initial swing of the laser 121. The system then divides the maximum angle of the initial swing by the energy loss coefficient to obtain the tilt angle of the laser 121.

[0078] The information processing module of the central processing unit of the system can calculate the tilt angle according to the above calculation logic.

[0079] The direction adjustment assembly 15 can then begin adjusting the fixed connection portion 11 while the laser 121 is oscillating. This pre-adjustment cannot be 100% accurate, but all adjustments involve a gradual process of approaching the target. This pre-adjustment can bring the starting position of the formal adjustment closer to the final target, effectively aligning the waiting time for the swing and the angle adjustment, thereby shortening the adjustment time. Furthermore, during multiple thickness measurements, multiple pre-adjustments can be performed to directly adjust the first reference surface 111 to a parallel horizontal plane. After the pre-adjustment is complete, the thickness measurement component can begin measuring. After the laser 121 stops oscillating, if the laser coordinates align with the reference coordinates, the thickness measurement result is considered correct, and the loading unit 04 proceeds directly to the next thickness measurement location. If the laser coordinates do not align with the reference coordinates, the direction adjustment assembly 15 will need to further adjust the first reference surface 111 based on the offset of the laser coordinates. Even if the laser coordinates do not align with the reference coordinates, the offset is only slight, so the residual tilt angle is minimal, allowing the direction adjustment assembly 15 to quickly complete the adjustment.

[0080] At this time, the laser 121 is only shaking due to the tilt. Generally, the tilt angle of the device is very small, so the time required to wait for the laser 121 to stop is very short.

[0081] In the technical solution mentioned in the background technology, the clamps clamp the laser 121 at the same time, but in reality they cannot be completely synchronized. The clamp on one side that contacts the laser 121 first will push the laser 121 toward the opposite side, causing the laser 121 to shift; and the clamps leave the laser 121 at the same time, but it is impossible for the clamps on both sides to be released truly synchronously. The elastic structure (usually a rubber layer) will push the laser 121 when resetting, which causes the laser 121 to be affected not only by gravity but also by the elastic force of the rubber layer when resetting and swinging. Therefore, the system cannot calculate the tilt angle through the swing angle, and the direction adjustment component 15 cannot intervene in advance. It is necessary to wait for the laser 121 to stop shaking before adjusting the direction.

[0082] The above situation only applies to the case where the laser 121 is tilted toward the rear end. The laser 121 may also be tilted toward the front end. The adjustment logic is the same as that when the laser 121 is tilted toward the rear end, but in the opposite direction.

[0083] It should be noted that the first clamping block 131 and the second clamping block 132 need to move away from the laser 121 at a relatively fast speed during the movement, and the speed of moving away should be greater than the swing speed of the laser 121 .

[0084] It should be understood that the fixed connection part 11 is connected to one end of the flexible connection part 122, and the other end of the flexible connection part 122 suspends the laser 121, and the laser sensing part 123 is arranged below the laser 121, that is, the fixed connection part 11 has at least two mounting surfaces, one is the first reference surface 111 for connecting the flexible connection part 122, and the other mounting surface is parallel to the first reference surface 111 and is used to mount the laser sensing part 123. A certain distance needs to be reserved between the laser sensing part 123 and the first reference surface 111. The longer the distance between the laser sensing part 123 and the first reference surface 111, the more obvious the deviation of the laser coordinates from the reference coordinates after tilting. The laser 121 can be relatively close to the mounting surface of the laser sensing part 123, so that the clamp is installed based on the mounting surface, and it is sufficient to ensure that the two mounting surfaces are parallel, thereby reducing the difficulty of processing.

[0085] The first clamping block 131 is driven by a first driving mechanism 134, and the second clamping block 132 is driven by a second driving mechanism 135. The first driving mechanism 134 and the second driving mechanism 135 are independent driving components, and do not require any mechanical transmission or linkage.

[0086] Conventional clamps typically use a motor to drive multiple clamps to move simultaneously, achieving clamping. These clamps lack control logic for which clamp approaches the clamped object first and which clamp moves away first. Furthermore, it's impossible for multiple clamps to contact the clamped object simultaneously. Therefore, if the order in which the clamps approach the clamped object is not carefully controlled, the clamped object will randomly shift toward a particular clamp, causing the laser 121 to wobble in this application.

[0087] Specifically, different clamping blocks can be driven by different driving mechanisms. The first driving mechanism 134 and the second driving mechanism 135 are configured with independent driving motors. It is only necessary for the system to control the driving motors of the first driving mechanism 134 and the second driving mechanism 135 to start at different times.

[0088] The first driving mechanism 134 and the second driving mechanism 135 can adopt screw transmission. A track, a screw and a driving motor are set in the fixed connection part 11, and a slider and a nut are set in the first clamping block 131. The slider engages with the track, and the screw is inserted into the nut. The screw is rotated by the driving motor to drive the first clamping block 131 to move.

[0089] The second driving mechanism 135 can be configured completely in accordance with the structure of the first driving mechanism 134 , but there is no requirement for the precision of the displacement position of the second clamping block 132 , so the second driving mechanism 135 can be configured more simply.

[0090] Example 2

[0091] Reference Figure 2-7 shown.

[0092] The clamping assembly 13 is further provided with a third clamping block 133 , and the third clamping block 133 and the first clamping block 131 exert a force on the laser 121 in the same direction;

[0093] The second clamping block 132 and the third clamping block 133 clamp the laser 121 before the first clamping block 131;

[0094] After the first clamping block 131 reaches the first reference position, the third clamping block 133 moves away from the laser 121 .

[0095] The main purpose of this application is to reduce the thickness measurement time by shortening the time for adjusting the direction of the fixed connection part 11. Therefore, this application provides different clamping components 13, in which the first clamping block 131 and the laser 121 are in hard contact. Therefore, it can be understood that the first clamping block 131 must never hit the laser 121 quickly. The first clamping block 131 must at least reserve a few millimeters of travel to slowly approach the laser 121. Then the loading part 04 needs to wait for the first clamping block 131 to complete clamping before it can move.

[0096] Reference Figure 5 As shown, in this embodiment, a third clamping block 133 is additionally added. The clamping surface of the third clamping block 133 and the second clamping block 132 can both be provided with a flexible layer, so that both can quickly approach the laser 121 without wearing the laser 121. The third clamping block 133 and the second clamping block 132 can complete the fixation of the laser 121 in just one or two seconds, and the loading unit 04 can begin to move. The first clamping block 131 can continue to approach the laser 121 during the movement of the loading unit 04, so the movement speed of the first clamping block 131 does not affect the thickness measurement speed in any way. The travel distance required for the loading unit 04 to move is much greater than the travel distance required for the first clamping block 131 to move, so the first clamping block 131 has enough time to approach the laser 121. After the first clamping block 131 reaches the first reference position, the third clamping block 133 begins to move away from the laser 121, no longer interfering with the contact between the laser 121 and the second reference surface 1311.

[0097] Similarly, the third clamping block 133 is equipped with a third driving mechanism 136 to independently drive the third clamping block 133 to move. The third driving mechanism 136 can also refer to the first driving mechanism 134 .

[0098] Example 3

[0099] Reference Figure 2-7 shown.

[0100] The fixed connection portion is provided with a blocking portion 14;

[0101] The blocking portion 14 has a third reference surface 141 perpendicular to the moving direction of the first clamping block 131 , and is used to define a first reference position of the first clamping block 131 .

[0102] While the equipment can produce parts with exceptionally flat and precise angles during machining, the first and second clamps 131 and 132 must move. During this movement, the first clamp 131 must accurately remain at the first reference position to position the laser 121. Photoelectric sensors are typically used to control the displacement of the parts. When a part blocks the photoelectric sensor, the motor stops, and the part stops moving. However, this positioning accuracy is not high. Furthermore, to achieve a positioning accuracy of 0.1 micron, the drive mechanism typically requires an ironless linear motor costing tens of thousands of yuan. (A linear motor is a motor that directly controls linear motion through magnetic force. Compared to a rotary motor, it can achieve linear motion without mechanical structures such as a lead screw or rack.) Furthermore, linear motors lack self-locking functionality and provide relatively low power (primarily due to the limited space available for the thickness measuring component). The thrust of the second clamp 132 can easily disrupt the position of the first clamp 131. (Increasing the power of a linear motor while maintaining accuracy and size further increases the cost of the linear motor.)

[0103] To this end, in this embodiment, a blocking portion 14 can be protruded from the mounting surface of the laser sensing portion 123, and one surface of the blocking portion 14 is formed into a third reference surface 141 through fine processing, so that the third reference surface 141 limits the maximum displacement distance of the first clamping block 131 toward the laser 121. After the third reference surface 141 is tightly fitted with the second reference surface 1311, the second reference surface 1311 also reaches a fixed position, which is equivalent to the thrust of the motor and the supporting force of the third reference surface 141 clamping and fixing the first clamping block 131 in the first reference position. This current position is the first reference position. When the laser 121 abuts the second reference surface 1311 of the first clamping block 131 in the first reference position, the laser is in a state perpendicular to the first reference surface 111. When the first reference surface 111 is tilted, the laser will also remain perpendicular to the first reference surface 111 and will no longer be affected by gravity.

[0104] like Figure 6As shown, the third reference surface 141 directly blocks the first clamp 131 in space, allowing it to stay in a very accurate position every time. Compared to control via electronic components, it has higher control accuracy and lower costs. The disadvantage of this positioning method is that the two parts are prone to wear and tear when in contact with each other. Therefore, the second reference surface 1311 and the third reference surface 141 need to be chrome-plated to increase the surface hardness. After chrome plating, the wear resistance of the parts will be increased several times, enough to withstand millions of wear cycles. In addition, the blocking portion 14 and the first clamp 131 can also be configured as a detachable connection structure, so that the blocking portion 14 and the first clamp 131 can be recalibrated or replaced when the equipment undergoes large-scale maintenance.

[0105] Further, such as Figure 3 As shown, the blocking portion 14 has two third reference surfaces 141, which are in the same plane and are respectively located on both sides of the laser 121. The two sides of the laser 121 are in the horizontal direction perpendicular to the movement direction of the first clamp 131.

[0106] This ensures that the blocking portion 14 can generate two force points on the first clamping block 131, preventing the first clamping block 131 from tilting in one direction.

[0107] Further, such as Figure 5 As shown, the distance between the clamping surface of the third clamping block 133 for the laser 121 and the clamping surface of the second clamping block 132 is L1;

[0108] The distance between the third reference surface 141 and the clamping surface of the second clamping block 132 is L2;

[0109] Among them, L2>L1.

[0110] The third clamp 133 and the second clamp 132 clamp the laser 121. It's difficult to ensure that the laser 121 remains perpendicular to the first reference plane 111. If the relative positions of the second and third clamps 132, 133 are not controlled, and their travel lengths and speeds are simply controlled to be equal, the laser 121 may deviate toward either the second clamp 132 or the third clamp 133. Deviating toward the third clamp 133 is equivalent to deviating toward the first slider. In this case, the first clamp 131 will abut the laser 121 before reaching the first reference position. Clearly, at this point, the laser 121 is no longer perpendicular to the first reference plane 111. The laser sensor 123 then relies on detecting that the laser coordinates are not aligned with the reference coordinates, and the first clamp 131 continues to squeeze the laser 121 forward. This process further deforms the flexible layer of the second clamp 132. The greater the deformation, the more difficult it is to control the direction and angle of the deformation, leading to skew in the laser 121.

[0111] To address the above problem, in this embodiment, the relative positions of the second clamping block 132 and the third clamping block 133 can be controlled.

[0112] First, when the laser 121 is perpendicular to the first reference surface 111, the contact surface between the laser 121 and the second reference surface 1311 and the third contact surface are in the same plane. Therefore, after the clamping surface of the third clamping block 133 passes the third reference surface 141, the laser emission is guaranteed to be offset toward the second clamping block 132, that is, L2>L1. At this time, the first clamping block 131 reaches the first reference position and does not encounter any resistance. Only when the first clamping block 131 continues to move forward will it encounter resistance from the blocking portion 14. Then, the third clamping block 133 begins to retreat, and the resistance to the second clamping block 132 decreases. The second clamping block 132 continues to move forward, pushing the laser 121 into contact with the second reference surface 1311.

[0113] Example 4

[0114] Reference Figure 2-7 shown.

[0115] The first driving mechanism 134 is provided with a pressure sensor 1341 , and the pressure sensor 1341 is set to a preset pressure value. When the first clamping block 131 moves toward the laser 121 , the resistance is less than the preset pressure value.

[0116] When the actual pressure value sensed by the pressure sensor 1341 is greater than the preset pressure value, it is determined that the first clamping block 131 has reached the first reference position.

[0117] By controlling the clamping position of the second clamp 132 and the third clamp 133 in Example 3, it is ensured that the first clamp 131 can contact the third reference surface 141 before contacting the laser 121. Therefore, the first clamp 131 will be subject to a friction resistance when it starts to move, causing a small increase in the pressure detected by the pressure sensor 1341 until the first clamp 131 actually abuts the blocking part 14. The pressure value sensed by the pressure sensor 1341 begins to rise continuously until the actual pressure value detected is greater than the preset pressure value. At this time, the system knows that the resistance does not come from friction but from the supporting force of the blocking part 14, which means that the second reference surface 1311 has abutted the third reference surface 141 and the first clamp 131 has reached the first reference position.

Claims

1. A hot-rolled steel plate thickness measurement system, comprising: A pair of loading parts sliding synchronously along two guide rails; a thickness measuring unit comprising a radiation source emitting portion and a radiation source receiving portion respectively installed in the pair of loading portions; It is characterized by: Each of the loading parts is also equipped with a fixed connection part, a direction detection component and a clamping component; The fixed connection portion has a first reference surface perpendicular to the direction of gravity, and the radiation source emitting portion or the radiation source receiving portion is fixedly installed on the fixed connection portion; The direction detection component includes a laser, a flexible connector and a laser sensing part; One end of the flexible connector is fixedly connected to the first reference surface of the fixed connection portion, and the other end is fixedly connected to the laser, so that the laser is suspended under the action of gravity and the laser beam emitted by the laser is along the direction of gravity; The laser sensing unit is fixedly mounted on the loading unit and is used to receive laser light and generate position coordinates. Wherein, the clamping assembly is connected to the fixed connection portion and has: Clamping state: during the movement of the loading part, the laser is clamped so that the laser remains perpendicular to the first reference plane; Release state: when the loading part stops moving, the fixation of the laser is released; The clamping assembly comprises: a first clamping block, wherein the clamping surface of the first clamping block for clamping the laser is a second reference surface; a second clamping block, which is provided with an elastic structure; The first clamping block has a first reference position. When the first clamping block moves until the second reference surface thereof contacts and abuts against the suspended laser, and the laser beam is perpendicular to the first reference surface of the fixed connection portion, the position of the first clamping block is the first reference position. Wherein, in the clamping state: the first clamping block is maintained at the first reference position, and the second clamping block is pressed against the laser under the action of the elastic structure, so that the laser is fixedly clamped between the first clamping block and the second clamping block; In the released state: the second clamp first overcomes the force of the elastic structure and moves away from the laser to release the clamping, and then the first clamp moves away from the laser to restore the laser to a suspended state.

2. A hot rolled steel plate thickness measurement system according to claim 1, characterized in that: Also includes a data processing module; The laser sensing unit is provided with a reference coordinate, and when the first reference plane is perpendicular to the laser beam, the laser beam irradiation position is the reference coordinate; The laser sensing unit is used to record the maximum offset distance of the laser coordinate relative to the reference coordinate; The data processing module is configured as follows: Calculating the swing angle of the laser according to the maximum offset distance; The tilt angle is calculated based on the product of the swing angle and a preset energy loss coefficient.

3. A hot rolled steel plate thickness measurement system according to claim 2, characterized in that: The clamping assembly further includes a third clamping block; The third clamping block and the first clamping block act on the laser in the same direction; The second clamping block and the third clamping block clamp the laser before the first clamping block; When the first clamping block reaches the first reference position, the third clamping block is separated from the laser.

4. A hot rolled steel plate thickness measurement system according to claim 3, characterized in that: The clamping surface of the third clamping block facing the laser is provided with a flexible layer.

5. The hot rolled steel plate thickness measurement system according to claim 3, characterized in that: The clamping assembly comprises: A first driving mechanism independently drives the first clamping block to move; A second driving mechanism independently drives the second clamping block to move; A third driving mechanism independently drives the third clamping block to move; Each driving mechanism is respectively equipped with an independent driving motor.

6. The hot rolled steel plate thickness measurement system according to claim 5, characterized in that: The fixed connection portion is provided with a blocking portion; The blocking portion has a third reference surface perpendicular to the moving direction of the first clamping block, which is used to define the first reference position of the first clamping block.

7. A hot rolled steel plate thickness measurement system according to claim 6, characterized in that: The blocking portion has two third reference surfaces, which are in the same plane and respectively located on both sides of the laser; the two sides of the laser are: a direction perpendicular to the movement direction of the first clamping block in the horizontal direction.

8. The hot rolled steel plate thickness measurement system according to claim 7, characterized in that: When the third clamping block and the second clamping block clamp the laser, the distance between the clamping surface of the third clamping block for the laser and the clamping surface of the second clamping block is L1; The distance from the third reference plane to the clamping surface of the second clamping block is L2; Among them, L2>L1.

9. The hot-rolled steel plate thickness measurement system according to claim 8, characterized in that: The first driving mechanism is provided with a pressure sensor; The pressure sensor is configured as follows: monitoring the motion pressure of the first clamp; When the measured pressure exceeds a preset threshold, it is determined that the first clamping block has reached the first reference position.

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