Length measuring device for transverse cutting machine of rock wool production line
By arranging the axis of the measuring wheel perpendicular to the plate surface and pressing it on the side in the rock wool plate length measurement device, combined with the front measuring device and proximity switch detection, the problem of the protrusion of the rock wool plate affecting the measuring accuracy is solved, and higher measurement accuracy and cutting accuracy are achieved.
Patent Information
- Application Number
- CN202421309415.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-06-11
AI Technical Summary
The dense oblong protrusions and sub-dense long protrusions on existing rock wool boards affect the length measurement accuracy, resulting in low cutting accuracy of the cross-cutting machine.
The axis of the measuring wheel and the hinge axis in the length measuring device are arranged perpendicular to the conveying surface of the rock wool board. The measuring wheel is pressed on the side of the rock wool board, and the elastic member is used to keep the measuring wheel in contact with the side. A second set of measuring devices is added before the measuring device to detect side defects, and the encoder signal is corrected through the proximity switch and baffle.
The measurement accuracy and cutting accuracy are improved, the stability and accuracy of rock wool plate length measurement is ensured, and the measurement error caused by side defects is reduced.
Smart Images
Figure CN223211520U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a length measuring device, specifically, a length measuring device for a cross-cutting machine on a rock wool production line. Background Art
[0002] Rock wool products are made of basalt, dolomite and other materials as the main raw materials. After being melted at a high temperature of more than 1500℃, they are centrifuged into fibers at high speed by a centrifuge. At the same time, a certain amount of adhesive, dust-proof oil, water-repellent, etc. are sprayed in. They are then collected by a cotton collector and spread through a pendulum process. After that, they are folded, pre-pressed, cured and cut to form rock wool products of different specifications and uses. A cross-cutting machine is used in the cutting equipment. In order to cut out the set board length, a rock wool board length measuring device is required for the cross-cutting machine. The higher the cutting accuracy requirement, the higher the length measurement accuracy requirement. The rock wool board length measuring device widely used in current technology is the encoder length measuring device, which mainly consists of a support, a hinge, a swing arm, an encoder, and a length measuring wheel. One end of the swing arm is connected to the support through a hinge, and the other end of the swing arm is fixedly connected to the encoder. The measuring wheel is fixed on the rotating shaft of the encoder or connected to the rotating shaft of the encoder through a coupling. The axis of the hinge should be parallel to the axis of the measuring wheel. The support is fixed on the frame above the conveying surface of the rock wool board conveyor of the production line with the hinge axis parallel to the conveying surface of the rock wool board conveyor of the production line. The measuring wheel swings up and down, and the measuring wheel falls on the upper surface of the rock wool board of the production line by gravity. The measuring wheel is driven to rotate by the upper surface of the rock wool board, and then the encoder is driven to rotate to measure the length of the rock wool board. The smaller and smoother the surface of the rock wool board is, the more accurate the length measured by the encoder through the measuring wheel will be.
[0003] Due to the manufacturing process of rock wool board, the rock wool in the curing furnace needs to be cured and shaped by high-temperature hot air, so dense oblong holes are punched on the upper and lower chain plates used for shaping in the curing furnace so that hot air can pass through these oblong holes from the rock wool between the upper and lower chain plates to achieve the curing and shaping of the rock wool board. In addition, the upper and lower chain plates are connected by separate chain plates, and there are long gaps between the separate chain plates. This brings a problem. The uncured rock wool fibers between the upper and lower chain plates at the front end of the curing furnace will be pressed into the oblong holes and long gaps on the chain plates under the pressure of the upper and lower chain plates to form a high The oblong protrusions and long strip protrusions ranging from several millimeters will be shaped and cured by high temperature and will not disappear after passing through the curing furnace. In this way, dense oblong protrusions and semi-dense long strip protrusions will be formed on the upper and lower surfaces of the rock wool board after it comes out of the curing furnace. The dense oblong protrusions and semi-dense long strip protrusions with heights ranging from several millimeters on the upper surface of these rock wool boards will cause the measuring wheel falling on them to fluctuate up and down, and the height of this fluctuation is random. These factors will inevitably have a greater impact on the length measurement accuracy of the encoder, and thus have a greater impact on the cutting accuracy of the cross-cutting machine.
[0004] In order to reduce the influence of these oblong protrusions and long strip protrusions on the length measurement accuracy of rock wool boards, some users try to reduce the influence of these oblong protrusions and long strip protrusions on the length measurement accuracy of rock wool boards by adding measuring wheels. The structure is to place a row of 3 to 5 measuring wheels on the rock wool board at intervals and connect them with a universal connecting rod. The encoder is placed on one side of this set of measuring wheels and connected to this set of measuring wheels. Each measuring wheel is fixed to the frame through a set of swing arms, hinges, and machine bases, and can swing up and down, so that each measuring wheel participates in the measurement. However, this structure only increases the number of contact points between the measuring wheel and the surface of the rock wool board, and cannot change the dense oblong protrusions and less dense long strip protrusions on the surface of the rock wool board. Adding measuring wheels only increases the frequency of the ups and downs of the measuring wheels and the mutual pulling. This length measuring device measures the length traveled by the measuring wheel after frequent ups and downs and mutual pulling on the surface of the rock wool board, and cannot effectively eliminate the influence of these oblong protrusions and long strip protrusions on the length measurement accuracy.
[0005] In order to reduce the influence of such oblong protrusions and long strip protrusions on the length measurement accuracy of rock wool boards, some users set a large-diameter transition wheel under the measuring wheel. The diameter of the measuring wheel is much smaller than that of the transition wheel in order to increase the length measurement resolution. The rotating shaft of the transition wheel is fixed on the large swing arm, and the large swing arm is fixed to the frame above the rock wool board through a hinge. The encoder is fixed to the large swing arm through a small swing arm. The measuring wheel fixed on the encoder rotating shaft falls on the transition wheel, and the transition wheel falls on the rock wool board. The rock wool board indirectly drives the measuring wheel through the transition wheel, and the large diameter of the transition wheel is used to reduce the up and down fluctuation amplitude of the transition wheel caused by the oblong protrusions and long strip protrusions on the rock wool board, so as to weaken the influence of the oblong protrusions and long strip protrusions on the rock wool board on the length measurement accuracy. Although this method can improve the length measurement accuracy, it still cannot significantly eliminate the influence of the oblong protrusions and long strip protrusions on the rock wool board on the length measurement accuracy. Utility Model Content
[0006] The technical problem to be solved by the utility model is to provide a length measuring device for a cross-cutting machine of a rock wool production line. When using the length measuring device, the influence of the dense oblong protrusions and the less dense long strip protrusions on the surface of the rock wool board on the length measurement accuracy is avoided, the length measurement accuracy is improved, and the foundation is laid for more accurate cutting of the cross-cutting machine.
[0007] In order to solve the above technical problems, the utility model comprises a length measuring device including a support, a hinge, a swing arm, an encoder, a length measuring wheel, and an elastic member. One end of the swing arm is connected to the support by a hinge, and the other end of the swing arm is fixedly connected to the encoder. The length measuring wheel is fixed on the rotating shaft of the encoder or connected to the rotating shaft of the encoder through a coupling. The axis of the length measuring wheel should be parallel to the axis of the hinge. The support is fixed on the frame at an angle such that the axis of the hinge is perpendicular to the conveying surface of the rock wool board conveyor on the production line. The length measuring device is fixed near one side of the rock wool board on the production line. The height requirement of the length measuring wheel is that the outer circumferential measuring surface of the length measuring wheel can be pressed on the side of the rock wool board. The requirement for the axis of the hinge to be away from the side of the rock wool board on the production line is that the outer circumferential measuring surface of the length measuring wheel can be pressed on the side of the rock wool board after the front end of the rock wool board passes through the length measuring wheel. The elastic member is used to turn the length measuring wheel towards the rock wool board. The orientation is because before the front end of the rock wool board reaches the length measuring device of the cross-cutting machine, its two side surfaces have been cut very flat by the trimming equipment at high speed. The length measuring device of the utility model arranges the hinge axis of the swing arm perpendicular to the conveying surface of the rock wool board conveyor, so that the swing arm swings parallel to the plane of the rock wool board, and uses the elastic component to press the measuring wheel on the flat side of the rock wool board to measure the length of the very flat side of the rock wool board. The hinge axis of the swing arm of the length measuring device of the prior art is arranged horizontally, the swing arm swings up and down, and the measuring wheel falls on the plane of the rock wool board. The length of the plane of the rock wool board with dense oblong protrusions and less dense long strip protrusions is measured. In comparison, the length measurement accuracy of a very flat surface is much higher than that of a very uneven surface. That is, the length measurement accuracy of the length measuring device of the utility model is much higher than that of the length measuring device of the prior art.
[0008] As a preferred structure of the hinge in the present invention, the hinge consists of a rotating shaft hole on the swing arm, a bearing hole on the support, a rotating shaft, and two rolling bearings. One end of the rotating shaft is fixed in the rotating shaft hole on the swing arm, and the rotating shaft and the swing arm cannot rotate relative to each other. The rotating shaft is fixed in the bearing hole on the support through two rolling bearings. Since two rolling bearings are used as supporting components, the swing resistance of the hinge is small, the stability is strong, and the service life is long.
[0009] As a preferred structure of the elastic component in the present invention, the elastic component is composed of a torsion spring, an open groove at one end of the hinge shaft, and several blind holes at the bottom of the bearing hole on the support. The torsion spring is sleeved on the hinge shaft, and the lower end of the torsion spring is fixed in the open groove at one end of the hinge shaft, and the upper end is fixed in the corresponding blind hole at the bottom of the bearing hole on the support. The bottom of the bearing hole is concentric with the shaft and is equal to the circumference of the torsion spring. A plurality of blind holes perpendicular to the bottom surface are opened. The diameter of the blind hole is slightly larger than the diameter of the torsion spring wire. The purpose of providing multiple blind holes is to facilitate the adjustment of the angle of the torsion spring and then adjust the angle of the swing arm in the free state, so that the swing arm deviates to the side with the rock wool board. The use of a torsion spring structure can make the structure simpler and more compact, and it is also very convenient to adjust the angle of the swing arm.
[0010] As a further improvement of the present invention, a length measuring device identical or similar to the length measuring device of the rock wool production line cross-cutting machine is arranged in front of the length measuring device of the rock wool production line cross-cutting machine, that is, facing the direction of the rock wool board of the production line. It is mainly composed of a second support, a second swing arm, a second encoder, a second measuring wheel, a second hinge, and a second elastic member. An orientation detection mechanism of the second swing arm is also added to the newly arranged length measuring device. The bottom surfaces of the two measuring wheels of the two sets of length measuring devices should be at the same height, the axes of the two hinges should be parallel and the distances to the side surfaces on the same side of the rock wool board of the rock wool production line should be equal. The purpose of setting up two sets of length measuring devices is to make the length measurement work more reliable.
[0011] As a preferred structure of the second swing arm azimuth detection mechanism further improved by the present invention, the azimuth detection mechanism of the second swing arm is composed of a proximity switch, a hole on the second support, a detection baffle, and a step on the second swing arm. The proximity switch is fixed in the hole on the second support, and the detection baffle is fixed to the step on the second swing arm with a slit hole and can be rotated to adjust the angle. This azimuth detection mechanism is simple, reliable, and easy to adjust. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
[0013] Figure 1 It is a three-dimensional schematic diagram of the length measuring device of the present invention.
[0014] Figure 2 This is an exploded perspective schematic diagram of the hinge and elastic member of the length measuring device of the present invention.
[0015] Figure 3 It is a three-dimensional schematic diagram of a combined length measuring device of two single length measuring devices of the utility model.
[0016] Figure 4 This is an exploded perspective diagram of the second swing arm orientation detection mechanism of the length measuring device of the present invention.
[0017] Figure 5 This is a three-dimensional schematic diagram of the appearance of the rock wool board.
[0018] Figure 6 It is a three-dimensional schematic diagram of the length measuring device of the utility model during measurement.
[0019] Figure 7 This is a schematic top view of the length measuring device of the utility model before measurement.
[0020] Figure 8 This is a top view of the dual length measuring device of the utility model before measurement.
[0021] Figure 9 This is a top view schematic diagram of the dual length measuring device of the utility model during measurement. DETAILED DESCRIPTION
[0022] Rock wool board is made of basalt, dolomite and other materials as the main raw materials. After being melted at a high temperature of more than 1500℃, it is centrifuged into fibers by a centrifuge at high speed. At the same time, a certain amount of adhesive, dust-proof oil, water-repellent, etc. is sprayed in. It is then collected by a cotton collector and spread by a pendulum method. It is then pre-pressed by a folding machine and enters the curing furnace between the upper and lower chain plates. It is compressed to the specified thickness by the upper and lower chain plates. High-temperature air of more than 200 degrees is used to pass through the upper and lower chain plates and the rock wool boards between them to solidify and shape the rock wool boards. By adjusting the speed of the rock wool boards, rock wool boards that meet the requirements of bulk density and thickness are produced. After leaving the curing furnace, the rock wool boards are cut by trimming, longitudinal cutting, cross-cutting and other cutting equipment. Cut out the rock wool board of set specifications. Since high-temperature air needs to pass through the upper and lower chain plates to solidify the rock wool fibers between them, dense oblong holes must be punched on the upper and lower chain plates. In addition, the upper and lower chain plates are connected by separate chain plates, and there are long gaps between the chain plates. This brings a problem. The uncured rock wool fibers between the upper and lower chain plates at the front end of the curing furnace will be pressed into the oblong holes and long gaps on the chain plates under the action of the pressure of the upper and lower chain plates, forming oblong protrusions and long strip protrusions with heights ranging from several millimeters. After passing through the curing furnace, these oblong protrusions and long strip protrusions will be cured and shaped by high temperature and will no longer disappear. Figure 5As shown, the rock wool board 31 after leaving the curing furnace will have dense oblong protrusions 36 and less dense long strip protrusions 37 on the upper surface 34 and the lower surface 35. The heights and shapes of these dense oblong protrusions 36 and less dense long strip protrusions 37 with heights varying from several millimeters have a certain randomness. The rock wool board after leaving the curing furnace is subjected to high-speed cutting on both sides by the trimming equipment according to the requirements of the total width, and the irregular edges are removed to obtain a very flat side 33 and the other side 32. The middle part of the rock wool board is then longitudinally cut by the longitudinal cutting machine and then reaches the length measuring device of the cross-cutting machine. The length measurement accuracy of the very flat side 33 or the other side 32 is much higher than that of the upper plane 34 with dense oblong protrusions 36 and less dense long strip protrusions 37 with heights varying from several millimeters and whose heights and shapes have a certain randomness, and the stability of the accuracy is also much higher. The front end face of the rock wool board 31 when moving is 38, and the rear end face is 39.
[0023] like Figure 1 As shown, the length measuring device of the present invention includes a support 1, a swing arm 2, an encoder 3, a length measuring wheel 4, a hinge 6, and an elastic member 7. One end of the swing arm 2 is connected to the support 1 through the hinge 6, and the other end of the swing arm 2 is fixedly connected to the encoder 3. The length measuring wheel 4 is fixed to the rotating shaft of the encoder 3 or connected to the rotating shaft of the encoder 3 through a coupling. The axis of the length measuring wheel 4 must be parallel to the axis of the hinge 6. Figure 6 As shown, the support 1 is fixed to the frame at an angle such that the axis of the hinge 6 is perpendicular to the rock wool board 31. In other words, the support 1 is fixed to the frame at an angle such that the axis of the hinge 6 is perpendicular to the conveying surface of the rock wool board conveyor of the production line. The frame is not shown here. The measuring wheel 4 swings parallel to the upper plane 34 of the rock wool board 31. The measuring device is located near one side of the rock wool board 31 on the production line. The height requirement of the measuring wheel 4 is that the outer circumferential measuring surface of the measuring wheel 4 can be pressed on the side 33 or the other side 32 of the rock wool board 31, and the axis of the hinge 6 is 1 / 4 of the rock wool board 31. The requirement for the side surface 33 or the other side surface 32 is that after the front end 38 of the rock wool board 31 passes the measuring wheel 4, the outer circumferential measuring surface of the measuring wheel 4 can be pressed against the side surface 33 or the other side surface 32 of the rock wool board 31. The swing arm 2 moves along the direction of movement of the rock wool board 31, relying on the elastic member 7 to press the outer circumferential measuring surface of the measuring wheel 4 against the side surface 33 or the other side surface 32 of the rock wool board 31. The very flat side surface 33 or the other side surface 32 of the moving rock wool board 31 is used to drive the measuring wheel 4 to rotate, thereby driving the encoder 3 to rotate, thereby realizing the measurement of the length of the rock wool board 31.
[0024] like Figure 1 、 2As shown, as a preferred structure of the hinge in the present invention, the hinge 6 is composed of a rotating shaft hole 8 on the swing arm 2, a bearing hole 9 on the support 1, a rotating shaft 10, and rolling bearings 13 and 14. One end 11 of the rotating shaft 10 is fixed in the rotating shaft hole 8 on the swing arm 2. The rotating shaft 10 and the swing arm 2 cannot rotate with each other. The rotating shaft 10 is fixed in the bearing hole 9 on the support 1 through two rolling bearings 13 and 14. Since two rolling bearings are used as supporting rotating parts, the swing resistance of the hinge 6 is small, the stability is strong, and the service life is long; the hinge 6 can have a variety of other structures, such as using a pin or bolt to connect the opening at one end of the swing arm 2 and the opening of the support 1, or using a hinge to connect one end of the swing arm 2 and the support 1; the support 1 can also be part of the frame and can be regarded as an invisible support.
[0025] like Figure 1 、 2 As shown, as a preferred structure of the elastic member 7 in the present invention, the elastic member 7 is composed of a torsion spring 15, an open groove 12 at one end of the rotating shaft 10, and several blind holes at the bottom of the bearing hole 9 on the support 1. The torsion spring 15 is sleeved on the rotating shaft 10 of the hinge 6, and the lower end 16 of the torsion spring 15 is fixed in the open groove 12 at one end of the rotating shaft 10, and the upper end 17 is fixed in the corresponding blind hole at the bottom of the bearing hole 9 on the support 1. A plurality of blind holes perpendicular to the bottom surface are opened on the circumference of a circle that is concentric with the rotating shaft 10 and equal to the middle diameter of the torsion spring 15. The diameter of the blind hole is slightly larger than the diameter of the torsion spring wire. The purpose of providing a plurality of blind holes is to facilitate the adjustment of the angle of the torsion spring 15 and then to adjust the angle of the swing arm 2 in the free state, so that the swing arm 2 is biased toward the side with the rock wool board 31 in the free state. Figure 7 When the front portion 38 of the rock wool board 31 passes through the measuring wheel 4, the outer circumferential measuring surface of the measuring wheel 4 may be pressed on the side 33 or the other side 32 of the rock wool board 31, as shown Figure 6 As shown; the use of a torsion spring 15 structure can make the structure simpler and more compact, and it is also convenient to adjust the angle of the swing arm; of course, the elastic member 7 can also have many other structures, such as using an external tension spring as an elastic body, or using an external compression spring as an elastic body; the elastic force of the torsion spring 15 or other elastic bodies should not be too small or too large. If it is too small, the friction between the measuring wheel and the rock wool board will be insufficient and easy to slip. If it is too large, the measuring wheel will sink into the rock wool board, which will also affect the measurement accuracy. This elastic force only needs to prevent the measuring wheel and the rock wool board from slipping.
[0026] The utility model length measuring device for measuring the side of the rock wool board with a length measuring wheel has a disadvantage while improving the measurement accuracy. For example, when the production is unstable or the equipment is improperly adjusted, small uneven defects such as pits or holes may occasionally appear on the side 33 or the other side 32 of the rock wool board 31. When the length measuring wheel 4 falls into these defects, the encoder 3 will send out an erroneous pulse signal. In order to avoid this defect, the utility model has made further improvements, such as Figure 3 As shown, in front of the length measuring device of the present invention, that is, facing the direction of the rock wool board of the production line, another set of identical or similar length measuring devices is installed, which includes a second support 18, a second swing arm 19, a second encoder 20, a second length measuring wheel 21, a second hinge 23, and a second elastic member 24. The newly installed length measuring device is also equipped with an orientation detection mechanism 25 of the second swing arm 19. The bottom surface 5 of the length measuring wheel 4 and the bottom surface 22 of the second length measuring wheel 21 should be at the same height; as shown in FIG. Figure 3 、 8 As shown, the axes of the hinge 6 and the second hinge 23 should be parallel and equidistant from the same side 33 or the other side 32 of the rock wool board 31 , and the distance between the support 1 and the second support 18 should be greater than the width of most small defects.
[0027] like Figure 3 、 4 As shown, as a preferred structure of the orientation detection mechanism 25 of the second swing arm 19, the orientation detection mechanism 25 of the second swing arm 19 is composed of a proximity switch 27, a hole 28 on the second support 18, a detection baffle 29, and a step 26 on the second swing arm 19. The proximity switch 27 is fixed in the hole 28 on the second support 18, and the detection baffle 29 is fixed to the step 26 on the second swing arm 19 with a slit hole 30 and can be rotated to adjust the angle. This orientation detection mechanism is simpler, more reliable, and more convenient to adjust. As long as the slit hole 30 is loosened, the slit is opened. The screw at the position can rotate the detection baffle 29, and after adjusting the angle, tighten the screw; of course, the orientation detection mechanism 25 can also have other structures. For example, the detection switch can also be a travel switch, a micro switch, a reed switch, a magnetic switch, etc. in addition to the proximity switch 27. As the detection switch changes, the fixing method of the detection switch must also be changed accordingly. For example, in addition to the split detection baffle 29, the detection baffle and the second swing arm 19 can also be made into one piece, that is, a part of the second swing arm 19 is used to trigger the detection switch.
[0028] The working process of the improved dual length measuring device to avoid side defects is as follows: Figure 8 、 9As shown, when the front end 38 of the rock wool board 31 has not yet moved to the second measuring wheel 21, the signaling baffle 29 does not block the proximity switch 27, the proximity switch 27 does not send a signal, the second encoder 20 and the encoder 4 do not rotate and no pulse output, when the front end 38 of the rock wool board 31 moves past the measuring wheel 4, the outer circumferential measuring surface of the second measuring wheel 21 and the measuring wheel 4 presses against the side 33 of the rock wool board 31, the signaling baffle 29 blocks the proximity switch 27, the proximity switch 27 sends a signal, the second encoder 20 and the encoder 4 start to rotate and send normal pulse signals, and the control system counts these pulse signals to calculate the speed and length of the rock wool board. When the small defect on the side 33 of the rock wool board 31 passes the second measuring wheel 21, the second measuring wheel 21 enters the small defect, driving the second swing arm 19 to deflect toward the rock wool board 31. When the second swing arm 19 deflects to a certain extent, such as more than 5 degrees, the signaling baffle 29 fixed on the second swing arm 19 no longer blocks the light. The electric switch 27 and the photoelectric switch 27 do not send a signal. At this time, the small defect has not reached the measuring wheel 4, so the pulse signal of the encoder 3 connected to the measuring wheel 4 is normal, while the pulse signal of the second encoder 20 connected to the second measuring wheel 21 is abnormal. When the small defect reaches the measuring wheel 4, the pulse signal of the encoder 3 connected to the measuring wheel 4 will be abnormal. However, at this time, the small defect has passed the second measuring wheel 21, and the outer circumferential measuring surface of the second measuring wheel 21 is pressed against the side surface 33 again. The proximity switch 27 is blocked by the signal transmission baffle 29 again and sends a signal. The pulse signal of the second encoder 20 connected to the second measuring wheel 21 becomes normal again. After such operation, there is always a normal encoder signal when the small defect passes. The control system can obtain the correct encoder signal by judging the signal of the proximity switch 27 and processing the encoder signal. After this improvement, the length measuring device of the utility model can improve the measurement accuracy and ensure the measurement stability.
Claims
1. A length measuring device for a cross-cutting machine of a rock wool production line, comprising a support (1), a swing arm (2), an encoder (3), a length measuring wheel (4), and a hinge (6); one end of the swing arm (2) is connected to the support (1) via the hinge (6), the other end of the swing arm (2) is fixedly connected to the encoder (3), the length measuring wheel (4) is fixed to the rotating shaft of the encoder (3) or connected to the rotating shaft of the encoder (3) via a coupling, the axis of the length measuring wheel (4) is parallel to the axis of the hinge (6), and the support (1) is fixed to the frame, characterized in that: The support (1) is fixed on the frame at an angle such that the axis of the hinge (6) is perpendicular to the conveying surface of the conveyor for conveying the rock wool board (31). The length measuring device is located near the side (33) or the other side (32) of the rock wool board (31) on the production line. The height requirement of the length measuring wheel (4) is that the outer circumferential measuring surface of the length measuring wheel (4) can be pressed on the side (33) or the other side (32) of the rock wool board (31). The requirement of the distance between the axis of the hinge (6) and the side (33) or the other side (32) of the rock wool board (31) on the production line is that after the front end (38) of the rock wool board (31) passes the length measuring wheel (4), the outer circumferential measuring surface of the length measuring wheel (4) can be pressed on the side (33) or the other side (32) of the rock wool board (31). The length measuring wheel (4) is turned toward the direction of the rock wool board (31) by an elastic member (7).
2. The length measuring device for the cross-cutting machine of the rock wool production line according to claim 1, characterized in that: The hinge (6) is composed of a rotating shaft hole (8) on the swing arm (2), a bearing hole (9) on the support (1), a rotating shaft (10), and rolling bearings (13) and (14). One end (11) of the rotating shaft (10) is fixed in the rotating shaft hole (8) on the swing arm (2). The rotating shaft (10) and the swing arm (2) cannot rotate relative to each other. The rotating shaft (10) is fixed in the bearing hole (9) on the support (1) through two rolling bearings (13) and (14).
3. The length measuring device of the cross-cutting machine of the rock wool production line according to claim 1 is characterized in that: The elastic member (7) is composed of a torsion spring (15), an open groove (12) at one end of the rotating shaft (10), and several blind holes at the bottom of the bearing hole (9) on the support (1). The torsion spring (15) is sleeved on the rotating shaft (10) of the hinge (6). The lower end (16) of the torsion spring (15) is fixed in the open groove (12) at one end of the rotating shaft (10). The upper end (17) of the torsion spring (15) is fixed in the corresponding blind hole at the bottom of the bearing hole (9) on the support (1). A plurality of blind holes perpendicular to the bottom surface are opened on a circle concentric with the rotating shaft (10) and equal to the median diameter of the torsion spring (15). The diameter of the blind hole is slightly larger than the diameter of the torsion spring wire.
4. The length measuring device for the cross-cutting machine of a rock wool production line according to claim 1, characterized in that: In front of the length measuring device of the rock wool production line cross-cutting machine, that is, in the direction facing the rock wool board of the production line, a length measuring device identical or similar to the length measuring device of the rock wool production line cross-cutting machine is arranged. The length measuring device is composed of a second support (18), a second swing arm (19), a second encoder (20), a second length measuring wheel (21), a second hinge (23), and a second elastic member (24). An orientation detection mechanism (25) of the second swing arm (19) is also added to the newly arranged length measuring device. The bottom surfaces of the length measuring wheel (4) and the second length measuring wheel (21) should be at the same height. The axes of the hinge (6) and the second hinge (23) should be parallel and the distances from the same side surface (33) or the same other side surface (32) of the rock wool board (31) should be equal.
5. The length measuring device for the cross-cutting machine of the rock wool production line according to claim 4, characterized in that: The orientation detection mechanism (25) of the second swing arm (19) is composed of a proximity switch (27), a hole (28) on the second support (18), a detection baffle (29), and a step (26) on the second swing arm (19). The proximity switch (27) is fixed in the hole (28) on the second support (18), and the detection baffle (29) is fixed to the step (26) on the second swing arm (19) through a slit hole (30) and can be rotated to adjust the angle.