Roll gap measuring device

Abstract

The utility model relates to a roll gap measuring device, and belongs to the technical field of roll-in coating. The utility model provides a roller gap measuring device which is used for detecting the size of a roller gap between a pair of roller bodies, the axis direction of the roller bodies extends in the first direction, the two roller bodies are arranged at intervals in the second direction, and the roller gap measuring device comprises a laser sensing assembly which comprises a laser transmitter and a laser receiver, the laser transmitter and the laser receiver are arranged on the two sides of a roll gap of the pair of roll bodies in the third direction; the moving mechanism is used for driving the laser sensing assembly to move in the first direction so as to detect the size of a roller gap between the pair of roller bodies; the first direction, the second direction and the third direction are perpendicular to one another. The roll gap measuring device can relieve the situation that the roll gap detection error is large due to deformation of the roll body, and has high roll gap detection precision.

Description

Technical Field

[0001] The present application relates to the technical field of roller coating, and in particular to a roller gap measuring device. Background Art

[0002] In the manufacturing process of lithium batteries, active materials need to be coated on the surface of the pole piece to provide raw materials for the next step. In the mainstream coating process, the pole piece needs to pass through the gap between a pair of rollers to further control the thickness of the pole piece. The accuracy of the roller gap directly determines the quality of the pole piece.

[0003] At present, a high-precision displacement sensor is installed on the bearing seat of the roller body, and the roller gap size is measured by indirectly detecting the offset of the bearing seat. The pole piece passes between a pair of roller bodies. Ideally, the roller body is regarded as a rigid body and does not deform during operation. However, in actual operation, the roller body is deformed under the action of force because the bearing seat pushes the roller body to squeeze the pole piece, and the bearing seat also deflects at an angle, driving the corresponding displacement sensor to deflect accordingly, causing the offset directions of the two bearing seats to lose parallelism with each other. This results in the method of detecting the offset of the bearing seat not being able to effectively determine whether the roller gap size is qualified, and the detection accuracy is poor. Utility Model Content

[0004] To this end, the present application proposes a roll gap measuring device, which can alleviate the situation where the roll gap detection error is large due to the deformation of the roll body and has a high roll gap detection accuracy.

[0005] The roll gap measuring device of some embodiments of the present application is used to detect the roll gap size between a pair of roll bodies, wherein the axial direction of the roll body extends along a first direction, and the two roll bodies are spaced apart along a second direction, and comprises: a laser sensor assembly, comprising a laser transmitter and a laser receiver, wherein the laser transmitter and the laser receiver are arranged on both sides of the roll gap of the pair of roll bodies along a third direction, and the laser receiver is used to receive the laser emitted by the laser transmitter; a moving mechanism, used to drive the laser sensor assembly to move along the first direction to detect the roll gap size between the pair of roll bodies; the first direction X, the second direction Y and the third direction Z are arranged perpendicularly in pairs.

[0006] According to some embodiments of the present application, the moving mechanism includes: a mounting frame, on which the laser sensor assembly is slidably mounted along the first direction; and a driving assembly for driving the laser sensor assembly to move along the first direction.

[0007] According to some embodiments of the present application, the mounting frame includes: a main bracket; a first support arm and a second support arm, the first support arm and the second support arm are spaced apart along the third direction, the first support arm and the second support arm both extend along the first direction, the laser transmitter is slidably mounted on the first support arm, the laser receiver is slidably mounted on the second support arm, and the driving assembly is used to drive the laser transmitter and the laser receiver to move synchronously.

[0008] According to some embodiments of the present application, the mounting frame further includes: a first slider and a second slider, the first slider being slidably mounted on the first support arm along the first direction, the second slider being slidably mounted on the second support arm along the first direction, the laser transmitter being mounted on the first slider, the laser receiver being mounted on the second slider, and the driving assembly being used to drive the first slider and the second slider to move synchronously.

[0009] According to some embodiments of the present application, the moving mechanism also includes: a first fine-tuning component installed on the first slider, the first fine-tuning component is used to drive the laser emitter to move relative to the first slider along the first direction to adjust the relative position of the laser emitter and the laser receiver in the first direction.

[0010] According to some embodiments of the present application, the moving mechanism further includes: a second fine-tuning component, installed on the main bracket, for driving the first support arm to move along the third direction to adjust the distance between the laser transmitter and the laser receiver.

[0011] According to some embodiments of the present application, it also includes: two cooling mechanisms, one of which is used to cool the laser transmitter, and the other cooling mechanism is used to cool the laser receiver; the cooling mechanism includes a cover, the cover includes a medium inlet and a medium outlet, and the cooling medium flows into the cover through the medium inlet and flows out of the cover through the medium outlet.

[0012] According to some embodiments of the present application, the cover is disposed on the laser transmitter or the laser receiver, and the cover is provided with a light outlet.

[0013] According to some embodiments of the present application, the cover is made of transparent material.

[0014] According to some embodiments of the present application, the laser transmitter includes a laser generator, a prism, a reflector and a first lens, the laser generator emits a laser, and after passing through the prism and the reflector, it is emitted from the first lens along a third direction; the laser receiver includes a second lens, a receiving light sensor and a controller, the first lens and the second lens are arranged opposite to each other along the third direction, the second lens is used to receive the laser transmitted by the first lens, the receiving light sensor is used to detect the parameters of the laser received by the second lens and feed back to the controller, and the controller is used to calculate the gap value between the pair of rollers according to the parameters of the laser fed back by the receiving light sensor.

[0015] Compared with the prior art, this solution has the following beneficial effects:

[0016] The roll gap measuring device of the embodiment of the present application can be used to measure the roll gap size between a pair of roll bodies. Driven by the moving mechanism, the laser sensor component moves along a first direction and detects local roll gap parameters at different detection points in the axial direction of the roll body. Even if the roll body itself is deformed, accurate roll gap parameters can be collected, thereby having higher roll gap detection accuracy and improving the rolling quality and safety performance of a pair of roll bodies.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of the roll gap measuring device provided in the embodiment of the present application Figure 1 ;

[0020] Figure 2 A schematic diagram of the structure of the roll gap measuring device provided in the embodiment of the present application Figure 2 ;

[0021] Figure 3 A schematic diagram of the structure of the roll gap measuring device provided in the embodiment of the present application Figure 3 ;

[0022] Figure 4 A schematic diagram of the structure of the laser transmitter and the laser receiver of the roll gap measuring device provided in an embodiment of the present application;

[0023] Figure 5 A schematic structural diagram of a first fine-tuning component and a second fine-tuning component of a moving mechanism of a roll gap measuring device provided in an embodiment of the present application;

[0024] Figure 6 A schematic structural diagram of the cooling mechanism of the roll gap measuring device provided in an embodiment of the present application.

[0025] Icons: 100-roller gap measuring device; 110-roller body; 120-laser sensing assembly; 121-laser transmitter; 1211-laser generator; 1212-prism; 1213-reflector; 1214-first lens; 122-laser receiver; 1221-second lens; 1222-receiving light sensor; 1223-controller; 1224-edge detection element; 130-moving mechanism; 131-mounting frame; 1311-main bracket; 1312-first guide rail assembly; 1313-second guide rail assembly; 1314-first support arm; 1315-first slider; 1316-second support arm; 1317-second slider; 132-driving assembly; 133-first fine-tuning assembly; 134-second fine-tuning assembly; 140-cooling mechanism; 141-cover; 142-medium inlet; 143-medium outlet; 144-light outlet; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0028] like Figure 1 , Figure 2 and Figure 3As shown, the roll gap measuring device 100 of some embodiments of the present application is used to detect the roll gap size between a pair of roll bodies 110, the axial direction of the roll body 110 extends along the first direction X, and the two roll bodies 110 are arranged at intervals along the second direction Y. The roll gap measuring device 100 includes a laser sensor assembly 120 and a moving mechanism 130, and the moving mechanism 130 is used to drive the laser sensor assembly 120 to move along the first direction X to detect the roll gap size △L between the pair of roll bodies 110. The laser sensor assembly 120 includes a laser transmitter 121 and a laser receiver 122, and the laser transmitter 121 and the laser receiver 122 are arranged on both sides of the roll gap of the pair of roll bodies 110 along the third direction Z, and the laser receiver 122 is used to receive the laser emitted by the laser transmitter 121, and the first direction X, the second direction Y and the third direction Z are arranged perpendicularly in pairs.

[0029] The roll gap size △L between a pair of roller bodies 110 refers to the roll gap size of the inner contour projection line of the two roller bodies 110 in the XY plane along the second direction Y. Along the first direction X, multiple detection points can be set, and each detection point can collect a specific roll gap size △L; the multiple detection points can be evenly spaced along the first direction X, or they can be arranged with a density gradually decreasing from the midpoint to the two ends. The detection parameters of the multiple detection points are used as data for further judging whether the roll gap size meets the setting.

[0030] The roll gap measuring device 100 of the embodiment of the present application can be used to measure the roll gap size △L between a pair of roll bodies 110. Driven by the moving mechanism 130, the laser sensor assembly 120 moves along the first direction X to detect whether the laser can smoothly pass through the gap between the pair of roll bodies 110. By measuring the time difference between the light and dark of the laser and setting parameters such as transmittance, accurate roll gap measurement values ​​can be obtained. Even if the roll body 110 itself is deformed, accurate roll gap parameters can be collected, thereby having a high roll gap detection accuracy, and improving the rolling quality and safety performance of the pair of roll bodies 110.

[0031] In other embodiments, a distance measuring sensor may be provided on one side of a pair of rollers 110 along the third direction Z to detect the distance of the front obstacle to determine whether there is a roller 110 blocking the laser path within the set distance, and then calculate the roller gap size △L.

[0032] like Figure 4As shown, in some embodiments of the present application, the laser transmitter 121 includes a laser generator 1211, a prism 1212, a reflector 1213 and a first lens 1214. The laser generator 1211 emits a laser, which passes through the prism 1212 and the reflector 1213 and is then emitted from the first lens 1214 along a third direction Z; the laser receiver 122 includes a second lens 1221, a receiving light sensor 1222 and a controller 1223. The first lens 1214 and the second lens 1221 are arranged opposite to each other along the third direction Z. The second lens 1221 is used to receive the laser transmitted by the first lens 1214. The receiving light sensor 1222 is used to detect the parameters of the laser received by the second lens 1221 and feed them back to the controller 1223. The controller 1223 is used to calculate the gap value between a pair of rollers 110 according to the parameters of the laser fed back by the receiving light sensor 1222.

[0033] The laser generator 1211 is a semiconductor laser generating device. In the second direction Y, the width range of the gap between a pair of rollers 110 falls within the laser emission width range of the laser emitter 121, so as to comprehensively detect the two end points of the roller gap size △L in the second direction Y.

[0034] The laser receiver 122 also includes an edge detection element 1224, which is electrically connected to the controller 1223. The edge detection element 1224 is used to assist in detecting whether there is laser light at the edge of the second lens 1221, so as to assist in determining whether the laser second lens 1221 covers the two end points of the roller gap in the second direction Y.

[0035] Through this setting, the laser emitter 121 can emit multiple parallel lasers along the third direction Z from one side of a pair of rollers 110. Some lasers pass smoothly through the gap between the pair of rollers 110 and are received by the second lens 1221, while some lasers are blocked by the surface of the roller 110 and cannot be smoothly shot to the second lens 1221.

[0036] In other embodiments, the laser generator 1211 may also form a plurality of lasers extending along the third direction Z by other refraction methods.

[0037] like Figure 3 As shown, in some embodiments of the present application, the moving mechanism 130 includes a mounting frame 131 and a driving assembly 132, the laser sensor assembly 120 is slidably mounted on the mounting frame 131 along the first direction X, and the driving assembly 132 is used to drive the laser sensor assembly 120 to move along the first direction X.

[0038] The laser emitter 121 and the laser receiver 122 can be installed on independent guide rail assemblies respectively, or they can share the same guide rail assembly; the driving assembly 132 can include only one driving component, and the one driving component drives the laser emitter 121 and the laser receiver 122 to move synchronously through the transmission assembly; the driving assembly 132 can also include two driving components, and the laser emitter 121 and the laser receiver 122 are respectively connected to the execution end of one driving component.

[0039] Driven by the driving assembly 132 , the laser emitter 121 and the laser receiver 122 move synchronously along the first direction X to detect the roll gap size ΔL at multiple detection points.

[0040] like Figure 3 As shown, in some embodiments of the present application, the mounting frame 131 includes a main bracket 1311, a first guide rail assembly 1312 and a second guide rail assembly 1313, the first guide rail assembly 1312 includes a first support arm 1314, the second guide rail assembly 1313 includes a second support arm 1316, the first support arm 1314 and the second support arm 1316 are spaced apart along a third direction Z, the first support arm 1314 and the second support arm 1316 both extend along a first direction X, the laser emitter 121 is slidably mounted on the first support arm 1314, the laser receiver 122 is slidably mounted on the second support arm 1316, and the driving assembly 132 is used to drive the laser emitter 121 and the laser receiver 122 to move synchronously.

[0041] The first support arm 1314 and the second support arm 1316 are respectively located on both sides of a pair of roller bodies 110 along the third direction Z. The length directions of the first support arm 1314 and the second support arm 1316 extend along the first direction X, and the length direction of the main bracket 1311 extends along the second direction Y. The first support arm 1314, the main bracket 1311 and the second support arm 1316 form a U-shaped structure.

[0042] The mounting frame 131 may be made of a monolithic aluminum alloy, or may be assembled from components of other hard materials.

[0043] Through this arrangement, the laser transmitter 121 and the laser receiver 122 can be driven to move synchronously, so as to measure the roller gap size of a pair of roller bodies 110 .

[0044] Furthermore, the first guide rail assembly 1312 includes a first slider 1315, and the second guide rail assembly 1313 includes a second slider 1317. The first slider 1315 is slidably mounted on the first support arm 1314 along the first direction X, and the second slider 1317 is slidably mounted on the second support arm 1316 along the first direction X. The laser transmitter 121 is mounted on the first slider 1315, and the laser receiver 122 is mounted on the second slider 1317. The driving assembly 132 is used to drive the first slider 1315 and the second slider 1317 to move synchronously.

[0045] Through this arrangement, the load of the laser sensor assembly 120 can be distributed to the first slider 1315 and the second slider 1317 respectively, thereby improving the supporting and guiding functions of the single support arm and alleviating the structural influence of the moment generated by gravity on the mounting frame 131.

[0046] The driving assembly 132 includes two linear driving members, one linear driving member is installed on the first support arm 1314 and drives the first slider 1315 to move along the first direction X, and the other linear driving member is installed on the second support arm 1316 and drives the second slider 1317 to move along the first direction X.

[0047] like Figure 5 As shown, in some embodiments of the present application, the moving mechanism 130 also includes a first fine-tuning component 133, which is installed on the first slider 1315. The first fine-tuning component 133 is used to drive the laser emitter 121 to move relative to the first slider 1315 along the first direction X to adjust the relative position of the laser emitter 121 and the laser receiver 122 in the first direction X.

[0048] The first fine-tuning component 133 can further adjust the relative positions of the laser emitter 121 and the laser receiver 122 along the first direction X to achieve alignment of the two along the third direction Z. The laser receiver 122 can accurately receive the laser emitted by the laser emitter 121, thereby improving the focusing accuracy of the two and improving the roller gap detection accuracy.

[0049] The first fine-tuning component 133 may be a top screw fine-tuning mechanism, or may be other forms of high-precision linear fine-tuning mechanisms.

[0050] In other embodiments, a fine-tuning component may also be provided on the second slider 1317 to fine-tune the position of the laser receiver 122 along the first direction X so as to accurately receive the laser light emitted by the laser transmitter 121 .

[0051] like Figure 5As shown, in some embodiments of the present application, the moving mechanism 130 also includes a second fine-tuning component 134 installed on the main bracket 1311, which is used to drive the first support arm 1314 to move along the third direction Z to adjust the distance between the laser emitter 121 and the laser receiver 122.

[0052] The length direction of the main bracket 1311 extends along the third direction Z. The second fine-tuning assembly 134 is installed at the end of the main bracket 1311 close to the first support arm 1314. The execution end is connected to the first support arm 1314, and can fine-tune the position of the first support arm 1314 relative to the main bracket 1311 in the third direction Z, thereby fine-tuning the distance between the laser emitter 121 and the laser receiver 122 in the third direction Z.

[0053] The second fine-tuning component 134 may be a top screw fine-tuning mechanism, or may be other forms of high-precision linear fine-tuning mechanisms.

[0054] This arrangement can adapt to a pair of roller bodies 110 with different roller diameters and measure the roller gap parameters of a pair of roller bodies 110 with different roller diameters.

[0055] In other embodiments, the distance between the laser emitter 121 and the laser receiver 122 may be fine-tuned by adjusting the position of the second support arm 1316 relative to the main support 1311 ; or, the distance between the two may be fine-tuned by fine-tuning the length of the main support 1311 itself.

[0056] like Figure 3 and Figure 6 As shown, in some embodiments of the present application, the roll gap measuring device 100 further includes two cooling mechanisms 140, wherein one cooling mechanism 140 is used to cool the laser transmitter 121, and the other cooling mechanism 140 is used to cool the laser receiver 122. The cooling mechanism 140 includes a housing 141, and the housing 141 includes a medium inlet 142 and a medium outlet 143. The cooling medium flows into the housing 141 through the medium inlet 142 and flows out of the housing 141 through the medium outlet 143.

[0057] By providing the cooling mechanism 140 , the heat generated by the laser emitter 121 and the laser receiver 122 during operation can be promptly removed, ensuring that the laser emitter 121 and the laser receiver 122 operate within a set temperature range, thereby improving the reliability and detection accuracy of the roll gap measuring device 100 .

[0058] In some embodiments of the present application, the cover 141 covers the laser transmitter 121 or the laser receiver 122 , and the cover 141 is provided with a light outlet 144 .

[0059] The two cooling mechanisms 140 have the same structure. Take the cooling mechanism 140 corresponding to the laser emitter 121 as an example. Figure 6 As shown, the housing 141 is fixed on the first slider 1315 and is provided with a light outlet 144. The laser emitter 121 is fixed inside the housing 141 and emits laser from the light outlet 144. The first slider 1315 drives the housing 141 and the laser emitter 121 to move synchronously. The cooling medium enters the housing 141 from the medium inlet 142 and leaves the housing 141 from the medium outlet 143 carrying the heat generated by the laser emitter 121. The cooling medium can be air, which is cooled by air cooling; the cooling medium can also be liquid, and a cooling coil is provided inside the housing 141, and the cooling medium passes through the cooling coil for cooling.

[0060] Furthermore, the cover 141 is made of a transparent material, so that the light outlet 144 can be omitted, and fully enclosed cooling can be achieved, which significantly reduces the impact of environmental factors on the laser transmitter 121 and the laser receiver 122, thereby improving the accuracy of roller gap detection.

[0061] For example, the cover 141 can be made of high-transmittance glass or the like.

[0062] The working principle of the roll gap measuring device 100 of the embodiment of the present application is as follows:

[0063] The first fine-tuning component 133 is used to adjust the distance between the laser emitter 121 and the laser receiver 122 in the first direction X, and the second fine-tuning component 134 is used to adjust the distance between the laser emitter 121 and the laser receiver 122 in the third direction Z, so that the relative position of the laser emitter 121 and the laser receiver 122 is optimal;

[0064] The laser emitter 121 and the laser receiver 122 are driven by the driving component 132 to move along the first direction X from one end to the other end of a pair of rollers 110. The laser emitter 121 emits laser, and the laser receiver 122 receives the laser. The range, light and dark time difference, light transmittance, etc. of the received laser are analyzed to calculate the roller gap parameters of each detection point.

[0065] Since the roller gap measuring device 100 of the embodiment of the present application can measure the state of the roller gap in real time and collect roller gap parameters at multiple detection points, it can overcome the undesirable situation of large detection deviation caused by the deformation of the roller body 110 itself, thereby effectively improving the roller gap measurement accuracy and effectively improving the coating quality of a pair of roller bodies 110.

[0066] It should be noted that, in the absence of conflict, the features in the embodiments of this application may be combined with each other.

[0067] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A roll gap measuring device (100) for detecting the size of a roll gap between a pair of roll bodies (110), wherein the axis direction of the roll bodies (110) extends along a first direction, and the two roll bodies are spaced apart along a second direction, characterized in that: include: A laser sensor assembly (120), comprising a laser transmitter (121) and a laser receiver (122), wherein the laser transmitter (121) and the laser receiver (122) are arranged on both sides of a roller gap of the pair of roller bodies (110) along a third direction, and the laser receiver (122) is used to receive laser light emitted by the laser transmitter (121); A moving mechanism (130) is used to drive the laser sensor assembly (120) to move along the first direction to detect the size of the roller gap between the pair of roller bodies (110); The first direction, the second direction and the third direction are arranged perpendicularly in pairs.

2. The roll gap measuring device (100) according to claim 1, characterized in that: The moving mechanism (130) comprises: A mounting frame (131), the laser sensor assembly (120) being slidably mounted on the mounting frame along the first direction; A driving component (132) is used to drive the laser sensor component (120) to move along the first direction.

3. The roll gap measuring device (100) according to claim 2, characterized in that: The mounting frame (131) comprises: Main support (1311); A first support arm (1314) and a second support arm (1316), wherein the first support arm (1314) and the second support arm (1316) are spaced apart along the third direction, and the first support arm (1314) and the second support arm (1316) both extend along the first direction, the laser emitter (121) is slidably mounted on the first support arm (1314), and the laser receiver (122) is slidably mounted on the second support arm (1316), and the driving assembly (132) is used to drive the laser emitter (121) and the laser receiver (122) to move synchronously.

4. The roll gap measuring device (100) according to claim 3, characterized in that: The mounting frame (131) further comprises: A first slider (1315) and a second slider (1317), wherein the first slider (1315) is slidably mounted on the first support arm (1314) along the first direction, and the second slider (1317) is slidably mounted on the second support arm (1316) along the first direction, the laser transmitter (121) is mounted on the first slider (1315), and the laser receiver (122) is mounted on the second slider (1317), and the driving component (132) is used to drive the first slider (1315) and the second slider (1317) to move synchronously.

5. The roll gap measuring device (100) according to claim 4, characterized in that: The moving mechanism (130) further comprises: A first fine-tuning component (133) is installed on the first slider (1315), and the first fine-tuning component (133) is used to drive the laser emitter (121) to move relative to the first slider (1315) along the first direction to adjust the relative position of the laser emitter (121) and the laser receiver (122) in the first direction.

6. The roll gap measuring device (100) according to claim 3, characterized in that: The moving mechanism (130) further comprises: A second fine-tuning assembly (134) is mounted on the main support (1311) and is used to drive the first support arm (1314) to move along the third direction so as to adjust the distance between the laser transmitter (121) and the laser receiver (122).

7. The roll gap measuring device (100) according to claim 1, characterized in that: Also includes: two cooling mechanisms (140), wherein one of the cooling mechanisms (140) is used to cool the laser transmitter (121), and the other of the cooling mechanisms (140) is used to cool the laser receiver (122); The cooling mechanism (140) comprises a casing (141), wherein the casing (141) comprises a medium inlet (142) and a medium outlet (143), and a cooling medium flows into the casing (141) through the medium inlet (142) and flows out of the casing (141) through the medium outlet (143).

8. The roll gap measuring device (100) according to claim 7, characterized in that: The cover shell (141) is disposed on the laser transmitter (121) or the laser receiver (122), and the cover shell (141) is provided with a light outlet.

9. The roll gap measuring device (100) according to claim 7, characterized in that: The cover shell (141) is made of transparent material.

10. The roll gap measuring device (100) according to claim 1, characterized in that: The laser emitter (121) comprises a laser generator (1211), a prism (1212), a reflector (1213) and a first lens (1214); the laser generator (1211) emits laser light, which passes through the prism (1212) and the reflector (1213) and then is emitted from the first lens (1214) along the third direction; The laser receiver (122) comprises a second lens (1221), a receiving light sensor (1222) and a controller (1223); the first lens (1214) and the second lens (1221) are arranged relative to each other along the third direction; the second lens (1221) is used to receive the laser transmitted by the first lens (1214); the receiving light sensor (1222) is used to detect the parameters of the laser received by the second lens (1221) and feed back the parameters to the controller (1223); the controller (1223) is used to calculate the gap value between the pair of rollers (110) according to the parameters of the laser fed back by the receiving light sensor (1222).

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