Concrete slab thickness detection device

Abstract

The present invention belongs to the technical field of detection equipment and discloses a concrete slab thickness detection device, the technical key points of which are: comprising a workbench, two groups of relatively distributed vertical plates are fixedly installed on the surface of the workbench, a plate body is placed between the two groups of vertical plates, a conveying mechanism that cooperates with the plate body is arranged between the two groups of vertical plates, the conveying mechanism comprises a conveying roller and a driving assembly, a detection mechanism that cooperates with the plate body is arranged between the two groups of vertical plates, the detection mechanism comprises an upper detection wheel, a lower detection wheel, a positioning assembly and a double-sided detection assembly, by arranging the positioning assembly and the double-sided detection assembly to cooperate with each other, the relative positions of the upper detection wheel and the lower detection wheel can be adjusted in real time on the upper and lower surfaces of the plate body, the amplitude of the thickness change of the plate body is reflected by the movement amplitude of the upper detection wheel and the lower detection wheel in the vertical direction, the plate body can be monitored in all directions from the upper and lower sides of the plate body, and the thickness detection accuracy of the plate body is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, in particular to a device for detecting the thickness of a concrete slab. Background Art

[0002] In construction projects, it is necessary to inspect the quality of the project, among which the inspection of concrete thickness is a part of the project inspection and acceptance. The more common measurement method is to drill holes in the floor slab. First, the floor slab is drilled with a drill bit, and then the concrete slab thickness detection device is passed through the hole for measurement.

[0003] Another device for detecting the thickness of a concrete slab includes a measuring rod, a cursor slidably mounted on the measuring rod, and a clamping plate fixedly connected to the bottom of the measuring rod. When measuring, the clamping plate is brought into contact with the surface of the concrete slab, and then the measuring rod is slid. The thickness of the concrete slab is measured using the corresponding values ​​between the cursor and the measuring rod.

[0004] Drilling is a complex testing method and cannot be performed multiple times on the concrete slab surface. Using a measuring rod only allows testing along the edges of the slab, preventing full-scale thickness testing. Furthermore, simultaneous testing of the top and bottom surfaces of the slab is impossible, resulting in low accuracy and large errors. Summary of the Invention

[0005] The object of the present invention is to provide a device for detecting the thickness of a concrete slab to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A device for detecting the thickness of a concrete slab comprises a workbench, wherein two sets of relatively distributed vertical plates are fixedly mounted on the surface of the workbench, a plate body is placed between the two sets of vertical plates, a conveying mechanism that cooperates with the plate body is provided between the two sets of vertical plates, the conveying mechanism comprises a conveying roller and a driving assembly, the conveying rollers are provided in multiple sets and are distributed in parallel between the two sets of vertical plates, the driving assembly is connected to the conveying rollers, the driving assembly is used to control the rotation of the multiple sets of conveying rollers, a detecting mechanism that cooperates with the plate body is provided between the two sets of vertical plates, the detecting mechanism comprises an upper detecting wheel and a lower detecting wheel , positioning assembly and double-sided detection assembly, multiple groups of upper detection wheels and lower detection wheels are provided and are respectively located on the upper and lower sides of the main body, the positioning assembly is located between the two groups of vertical plates and is respectively connected to the upper detection wheel and the lower detection wheel, the positioning assembly is used to control the multiple groups of upper detection wheels and lower detection wheels to be distributed in an inclined state along the width direction of the plate body, the double-sided detection assembly is connected to the positioning assembly, when the upper detection wheel and the lower detection wheel are respectively in contact with the upper and lower surfaces of the plate body, the positioning assembly performs all-round monitoring of the thickness error of the plate body by cooperating with the double-sided detection assembly.

[0008] As a further solution of the present invention: the driving assembly includes multiple groups of rotating columns rotatably installed between two groups of vertical plates, the conveying rollers are fixedly installed on the surface of the rotating columns, and synchronous gear plates are fixedly installed on the surface of the rotating columns. The multiple groups of synchronous gear plates are commonly connected to a synchronous belt, and one end of a group of rotating columns extends to the outside of the vertical plates and is connected to a motor.

[0009] As a further solution of the present invention: the positioning assembly includes multiple groups of horizontal plates fixedly installed between two groups of vertical plates, and the bottom walls of the multiple groups of horizontal plates are respectively fixedly installed with upper positioning cylinders, and the multiple groups of upper positioning cylinders are distributed in an inclined state along the width direction of the plate body, and an upper telescopic rod is slidably installed in the upper positioning cylinder, and the bottom end of the upper telescopic rod extends to the outside of the upper positioning cylinder and is rotatably connected to the upper detection wheel. The surface of the workbench is fixedly installed with multiple groups of lower positioning cylinders distributed relative to the upper positioning cylinder, and a lower telescopic rod is slidably installed in the lower positioning cylinder, and the top end of the lower telescopic rod extends to the outside of the lower positioning cylinder and is rotatably connected to the lower detection wheel. Extrusion springs are respectively fixedly installed in the upper positioning cylinder and the lower positioning cylinder, and the telescopic ends of the extrusion springs are respectively connected to the upper telescopic rod and the lower telescopic rod.

[0010] As a further solution of the present invention: the double-sided detection assembly includes an upper connecting rod fixedly installed on the side wall of the upper telescopic rod, the upper connecting rod is fixedly installed with an upper detection block at one end away from the upper telescopic rod, the lower connecting rod is fixedly installed on the side wall of the lower telescopic rod, and the lower connecting rod is fixedly installed with a lower detection block located directly below the upper detection block, the surface of the lower detection block is fixedly installed with a first vertical rod, the top of the first vertical rod is fixedly installed with a lower pressure sensor located below the upper detection block, the surface of the lower detection block is fixedly installed with a second vertical rod, the top of the second vertical rod passes through the upper detection block and extends to above the upper detection block and is fixedly installed with an upper pressure sensor, the gap between the upper detection block and the upper pressure sensor is the qualified error range exceeded by the plate thickness, and the gap between the upper detection block and the lower pressure sensor is the qualified error range reduced by the plate thickness.

[0011] As a further solution of the present invention: a controller is installed in the lower detection block, the upper pressure sensor and the lower pressure sensor are electrically connected to the controller respectively, and an alarm is fixedly installed on the bottom wall of the lower detection block, and the alarm is electrically connected to the controller.

[0012] As a further solution of the present invention: an electric cylinder is fixedly installed on the side wall of the upper telescopic rod, the electric cylinder is electrically connected to the controller, and a marking pen is fixedly installed on the telescopic end of the electric cylinder.

[0013] As a further solution of the present invention: the inner side walls of the upper positioning cylinder and the lower positioning cylinder are respectively provided with limiting grooves, and the side walls of the upper telescopic rod and the lower telescopic rod are respectively fixedly installed with limiting blocks, and the limiting blocks are slidably connected to the limiting grooves along the vertical direction.

[0014] Compared with the prior art, the present invention has the following beneficial effects: by setting a positioning component and cooperating with a double-sided detection component, the relative positions of the upper detection wheel and the lower detection wheel can be adjusted in real time on the upper and lower surfaces of the plate body. The amplitude of the vertical movement of the upper and lower detection wheels reflects the amplitude of the thickness change of the plate body. The plate body can be monitored in all directions from both the upper and lower sides, effectively improving the thickness detection accuracy of the plate body. This solves the current problem that the thickness of the concrete slab can only be detected along the edge position, and the surface of the concrete slab cannot be fully detected. In addition, the unevenness of the upper and lower surfaces of the concrete slab cannot be detected synchronously during detection, resulting in low detection accuracy and large errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The figure is a schematic diagram of the three-dimensional structure of a concrete slab thickness detection device provided in an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the main structure of a concrete slab thickness detection device provided in an embodiment of the present invention.

[0017] Figure 3 The figure is a schematic diagram of a plate body and its connection structure in a concrete slab thickness detection device provided in an embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of an upper detection wheel, a lower detection wheel and their connection structure in a concrete slab thickness detection device provided in an embodiment of the present invention.

[0019] Figure 5 The figure is a schematic diagram of the internal structure of an upper positioning cylinder in a concrete slab thickness detection device provided in an embodiment of the present invention.

[0020] Among them: 1- workbench, 2- vertical plate, 3- plate body, 4- conveying mechanism, 41- conveying roller, 42- driving assembly, 421- rotating column, 422- synchronous gear plate, 423- synchronous belt, 424- motor, 5- detection mechanism, 51- upper detection wheel, 52- lower detection wheel, 53- positioning assembly, 531- upper positioning cylinder, 532- upper telescopic rod, 533- lower positioning cylinder, 534- lower telescopic rod, 535- extrusion spring, 536- horizontal plate, 54- double-sided detection assembly, 541- upper connecting rod, 542- upper detection block, 543- lower connecting rod, 544- lower detection block, 545- first vertical rod, 546- lower pressure sensor, 547- second vertical rod, 548- upper pressure sensor, 6- controller, 7- alarm, 8- electric cylinder, 9- marking pen, 10- limit slot, 11- limit block. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0022] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0023] like Figure 1 、 Figure 2As shown, a structural diagram of a concrete slab thickness detection device provided by an embodiment of the present invention includes a workbench 1, two sets of relatively distributed vertical plates 2 are fixedly installed on the surface of the workbench 1, a plate body 3 is placed between the two sets of vertical plates 2, a conveying mechanism 4 that cooperates with the plate body 3 is provided between the two sets of vertical plates 2, the conveying mechanism 4 includes a conveying roller 41 and a driving component 42, the conveying roller 41 is provided with multiple groups and is distributed in parallel between the two sets of vertical plates 2, the driving component 42 is connected to the conveying roller 41, the driving component 42 is used to control the rotation of the multiple groups of conveying rollers 41, a detection mechanism 5 that cooperates with the plate body 3 is provided between the two sets of vertical plates 2, and the detection mechanism 5 includes an upper detection wheel 51 , lower detection wheel 52, positioning assembly 53 and double-sided detection assembly 54, the upper detection wheel 51 and the lower detection wheel 52 are provided with multiple groups and are respectively located on the upper and lower sides of the main body 3, the positioning assembly 53 is located between the two groups of vertical plates 2 and is respectively connected to the upper detection wheel 51 and the lower detection wheel 52, the positioning assembly 53 is used to control the multiple groups of upper detection wheels 51 and lower detection wheels 52 to be distributed in an inclined state along the width direction of the plate body 3, the double-sided detection assembly 54 is connected to the positioning assembly 53, when the upper detection wheel 51 and the lower detection wheel 52 are respectively in contact with the upper and lower surfaces of the plate body 3, the positioning assembly 53 performs all-round monitoring of the thickness error of the plate body 3 by cooperating with the double-sided detection assembly 54.

[0024] During the production and processing of the plate body 3, batches of plate bodies 3 are placed on the surface of the conveying roller 41 in turn, and the driving component 42 controls the multiple groups of conveying rollers 41 to rotate and thereby push the plate body 3 to move between the two groups of vertical plates 2. When the plate body 3 moves, the positioning component 53 supports and positions the upper detection wheel 51 and the lower detection wheel 52. The multiple groups of upper detection wheels 51 roll along the upper surface of the plate body 3, and the multiple groups of lower detection wheels 52 roll along the lower surface of the plate body 3. When the thickness of the upper and lower surfaces of the plate body 3 changes, the upper detection wheel 51 and the lower detection wheel 52 are synchronously fine-tuned in the vertical direction. The multiple groups of upper detection wheels 51 and the lower detection wheels 52 are distributed side by side along the width direction of the plate body 3, and the thickness of the plate body 3 can be detected in all directions. When the thickness of the plate body 3 increases beyond the qualified range or decreases beyond the qualified range, the double-sided detection component 54 can send an alarm signal in real time.

[0025] like Figure 1 、 Figure 2 、 Figure 3 As shown, as a preferred embodiment of the present invention, the driving assembly 42 includes multiple groups of rotating columns 421 rotatably installed between two groups of vertical plates 2, the conveying roller 41 is fixedly installed on the surface of the rotating column 421, and a synchronous gear plate 422 is fixedly installed on the surface of the rotating column 421. The multiple groups of synchronous gear plates 422 are commonly connected to a synchronous belt 423, and one end of a group of rotating columns 421 extends to the outside of the vertical plate 2 and is connected to a motor 424.

[0026] Place the plate body 3 on the surface of the conveying roller 41, and the motor 424 drives a group of rotating columns 421 to rotate and then drives the synchronous gear plate 422 to rotate synchronously. Multiple groups of synchronous gear plates 422 cooperate with the synchronous belt 423 to drive multiple groups of rotating columns 421 to rotate synchronously. The rotating columns 421 drive the conveying roller 41 to rotate synchronously. The conveying roller 41 can easily push the plate body 3 to translate between the two groups of vertical plates 2.

[0027] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 As shown, as a preferred embodiment of the present invention, the positioning assembly 53 includes multiple groups of horizontal plates 536 fixedly installed between two groups of vertical plates 2, and the bottom walls of the multiple groups of horizontal plates 536 are respectively fixedly installed with upper positioning cylinders 531, and the multiple groups of upper positioning cylinders 531 are distributed in an inclined state along the width direction of the plate body 3, and the upper telescopic rod 532 is slidably installed in the upper positioning cylinder 531. The bottom end of the upper telescopic rod 532 extends to the outside of the upper positioning cylinder 531 and is rotatably connected to the upper detection wheel 51. The surface of the workbench 1 is fixedly installed with multiple groups of lower positioning cylinders 533 distributed relatively to the upper positioning cylinder 531, and the lower telescopic rod 534 is slidably installed in the lower positioning cylinder 533. The top end of the lower telescopic rod 534 extends to the outside of the lower positioning cylinder 533 and is rotatably connected to the lower detection wheel 52, and the upper positioning cylinder 531 and the lower positioning cylinder 533 are respectively fixedly installed with extrusion springs 535, and the telescopic ends of the extrusion springs 535 are respectively connected to the upper telescopic rod 532 and the lower telescopic rod 534.

[0028] The upper positioning cylinder 531 and the upper telescopic rod 532 cooperate with each other to position the upper detection wheel 51, and the lower positioning cylinder 533 and the lower telescopic rod 534 match each other to position the lower detection wheel 52. The extrusion spring 535 applies a thrust to the upper telescopic rod 532 and the lower telescopic rod 534 so that the upper detection wheel 51 and the lower detection wheel 52 are respectively fitted with the upper and lower surfaces of the plate body 3. When the plate body 3 moves horizontally, the upper detection wheel 51 and the lower detection wheel 52 roll relative to each other along the surface of the main body 3. When the thickness of the plate body 3 changes, the upper detection wheel 51, the upper telescopic rod 532, the lower detection wheel 52 and the lower telescopic rod 534 move synchronously in a small amplitude in the vertical direction. When the thickness change of the plate body 3 exceeds the qualified error range, the double-sided detection component 54 can send an alarm signal in real time.

[0029] like Figure 2 、 Figure 3 、 Figure 4As shown in FIG, as a preferred embodiment of the present invention, the double-sided detection assembly 54 includes an upper connecting rod 541 fixedly mounted on the side wall of the upper telescopic rod 532, an upper detection block 542 is fixedly mounted on the end of the upper connecting rod 541 away from the upper telescopic rod 532, a lower connecting rod 543 is fixedly mounted on the side wall of the lower telescopic rod 534, and a lower detection block 544 located directly below the upper detection block 542 is fixedly mounted on the end of the lower connecting rod 543 away from the lower telescopic rod 534, and a first vertical rod 545 is fixedly mounted on the surface of the lower detection block 544. A lower pressure sensor 546 located below the upper detection block 542 is fixedly installed on the top of the rod 545, and a second vertical rod 547 is fixedly installed on the surface of the lower detection block 544. The top of the second vertical rod 547 passes through the upper detection block 542 and extends to above the upper detection block 542 and is fixedly installed with an upper pressure sensor 548. The gap between the upper detection block 542 and the upper pressure sensor 548 is the acceptable error range for the thickness of the plate body 3 to exceed, and the gap between the upper detection block 542 and the lower pressure sensor 546 is the acceptable error range for the thickness of the plate body 3 to decrease.

[0030] The upper telescopic rod 532 and the upper connecting rod 541 cooperate with each other to support and position the upper detection block 542, the lower telescopic rod 534 and the lower connecting rod 543 cooperate with each other to support and position the lower detection block 544, the first vertical rod 545 and the lower detection block 544 cooperate with each other to support and position the lower pressure sensor 546, and the second vertical rod 547 and the lower detection block 544 cooperate with each other to support and position the upper pressure sensor 548. When the upper detection wheel 51 moves slightly in the vertical direction, the upper telescopic rod 532 and the upper connecting rod 541 cooperate with each other to drive the upper detection block 542 to move synchronously in the vertical direction. When the lower detection wheel 52 moves slightly in the vertical direction, the lower telescopic rod 534 and the lower connecting rod 543 cooperate with each other to drive the lower detection block 544 to move synchronously in the vertical direction. When the upper detection block 542 and the lower detection block 544 move in the vertical direction, the size of the gap between the lower pressure sensor 546 and the upper pressure sensor 548 and the upper detection block 542 can be adjusted synchronously. When the thickness of a certain position of the plate body 3 exceeds the qualified error range, the upper detection block 542 contacts the upper pressure sensor 548, and the upper detection block 542 applies thrust to the upper pressure sensor 548, and the upper pressure sensor 548 sends a signal to warn. When the thickness of a certain position of the plate 3 is too thin and exceeds the qualified error range, the upper detection block 542 contacts the lower pressure sensor 546, and the upper detection block 542 applies a thrust to the lower pressure sensor 546, and the lower pressure sensor sends a signal to warn.

[0031] like Figure 2 、 Figure 4As shown, as a preferred embodiment of the present invention, a controller 6 is installed in the lower detection block 544, the upper pressure sensor 548 and the lower pressure sensor 546 are electrically connected to the controller 6 respectively, and an alarm 7 is fixedly installed on the bottom wall of the lower detection block 544, and the alarm 7 is electrically connected to the controller 6.

[0032] When the upper pressure sensor 548 or the lower pressure sensor 546 sends a pressure signal, the controller 6 controls the alarm 7 to send an alarm signal, and the staff can understand the thickness change of the corresponding position of the plate 3 in real time.

[0033] like Figure 2 、 Figure 4 As shown, as a preferred embodiment of the present invention, an electric cylinder 8 is fixedly installed on the side wall of the upper telescopic rod 532, the electric cylinder 8 is electrically connected to the controller 66, and a marking pen 9 is fixedly installed on the telescopic end of the electric cylinder 8.

[0034] When the controller 6 receives the electrical signal from the upper pressure sensor 548 or the lower pressure sensor 546, the controller 6 controls the electric cylinder 8 to start, and the electric cylinder 8 pushes the marking pen 9 to move toward the plate 3. The marking pen 9 draws a mark at the corresponding position on the surface of the plate 3, and the staff can easily understand the position where the thickness of the plate 3 is unqualified.

[0035] like Figure 4 、 Figure 5 As shown, as a preferred embodiment of the present invention, the inner walls of the upper positioning cylinder 531 and the lower positioning cylinder 533 are respectively provided with limiting grooves 10, and the side walls of the upper telescopic rod 532 and the lower telescopic rod 534 are respectively fixedly installed with limiting blocks 11, and the limiting blocks 11 are slidably connected to the limiting grooves 10 along the vertical direction.

[0036] When the upper telescopic rod 532 slides in the upper positioning tube 531 or the lower telescopic rod 534 slides in the lower positioning tube 533, the limit block 11 slides synchronously along the limit groove 10, which can effectively improve the stability of the upper telescopic rod 532 and the lower telescopic rod 534.

[0037] The working principle of the present invention is as follows: the upper positioning cylinder 531 and the upper telescopic rod 532 cooperate with each other to position the upper detection wheel 51, and the lower positioning cylinder 533 and the lower telescopic rod 534 match each other to position the lower detection wheel 52. During the production and processing of the plate bodies 3, batches of plate bodies 3 are placed on the surface of the conveyor roller 41 in sequence. The motor 424 drives a set of rotating columns 421 to rotate, thereby driving the synchronous gear plate 422 to rotate synchronously. Multiple sets of synchronous gear plates 422 cooperate with the synchronous belt 423 to drive multiple sets of rotating columns 421 to rotate synchronously. The rotating columns 421 drive the conveyor roller 41 to rotate synchronously. The conveyor roller 41 can conveniently push the plate bodies 3 to translate between the two sets of vertical plates 2.

[0038] The extrusion spring 535 applies a thrust to the upper telescopic rod 532 and the lower telescopic rod 534, thereby causing the upper detection wheel 51 and the lower detection wheel 52 to fit the upper and lower surfaces of the plate body 3 respectively. When the plate body 3 moves horizontally, the upper detection wheel 51 and the lower detection wheel 52 roll relative to each other along the surface of the main body 3. When the thickness of the plate body 3 changes, the upper detection wheel 51, the upper telescopic rod 532, the lower detection wheel 52 and the lower telescopic rod 534 move synchronously in a small amplitude in the vertical direction. When the upper detection wheel 51 moves slightly in the vertical direction, the upper telescopic rod 532 and the upper connecting rod 541 cooperate with each other to drive the upper detection block 542 to move synchronously in the vertical direction. When the lower detection wheel 52 moves slightly in the vertical direction, the lower telescopic rod 534 and the lower connecting rod 541 cooperate with each other to drive the upper detection block 542 to move synchronously in the vertical direction. 543 cooperate with each other to drive the lower detection block 544 to move synchronously in the vertical direction. When the upper detection block 542 and the lower detection block 544 move in the vertical direction, the lower pressure sensor 546 and the gap between the upper pressure sensor 548 and the upper detection block 542 can be synchronously adjusted. When the thickness of a certain position of the plate body 3 is too thick and exceeds the acceptable error range, the upper detection block 542 contacts the upper pressure sensor 548, and the upper detection block 542 applies a thrust to the upper pressure sensor 548, causing the upper pressure sensor 548 to send a signal to warn. When the thickness of a certain position of the plate body 3 is too thin and exceeds the acceptable error range, the upper detection block 542 contacts the lower pressure sensor 546, and the upper detection block 542 applies a thrust to the lower pressure sensor 546, causing the lower pressure sensor to send a signal to warn.

[0039] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A device for detecting the thickness of a concrete slab, comprising a workbench, wherein two sets of vertical plates arranged opposite to each other are fixedly mounted on the surface of the workbench, and a plate body is placed between the two sets of vertical plates, characterized in that: A conveying mechanism that cooperates with the plate body is provided between the two groups of vertical plates, and the conveying mechanism includes a conveying roller and a driving assembly; The conveying rollers are provided in multiple groups and are distributed in parallel between the two groups of vertical plates. The driving assembly is connected to the conveying rollers, and the driving assembly is used to control the rotation of the multiple groups of conveying rollers. A detection mechanism that cooperates with the plate body is provided between the two sets of vertical plates. The detection mechanism includes an upper detection wheel, a lower detection wheel, a positioning component and a double-sided detection component. The axle up and down groove at two ends embeds respectively in two guide rails up and down of being made up of the groove on the attachment piece, and the tooth on the attachment piece is meshed with tooth on upper sprocket wheel, the lower sprocket. The top of the lower frame is provided with a toothed connection, and the toothed connection is connected with the toothed connection of the tool and the lower frame.

2. A concrete slab thickness detection device according to claim 1, characterized in that: The driving assembly includes multiple groups of rotating columns rotatably installed between two groups of vertical plates, the conveying rollers are fixedly installed on the surface of the rotating columns, and synchronous gear plates are fixedly installed on the surface of the rotating columns. Multiple groups of synchronous gear plates are commonly connected to a synchronous belt, and one end of a group of rotating columns extends to the outside of the vertical plates and is connected to a motor.

3. A concrete slab thickness detection device according to claim 1, characterized in that: A controller is installed in the lower detection block, and the upper pressure sensor and the lower pressure sensor are electrically connected to the controller respectively. An alarm is fixedly installed on the bottom wall of the lower detection block, and the alarm is electrically connected to the controller.

4. A concrete slab thickness detection device according to claim 3, characterized in that: An electric cylinder is fixedly mounted on the side wall of the upper telescopic rod. The electric cylinder is electrically connected to a controller. A marking pen is fixedly mounted on the telescopic end of the electric cylinder.

5. The device for detecting the thickness of a concrete slab according to claim 1, wherein: The inner side walls of the upper positioning cylinder and the lower positioning cylinder are respectively provided with limiting grooves, and the side walls of the upper telescopic rod and the lower telescopic rod are respectively fixedly installed with limiting blocks, and the limiting blocks are slidably connected with the limiting grooves along the vertical direction.

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