Surface detection device for production of coated paper

Abstract

The invention provides a surface detection device for coated paper production, which comprises a detection assembly, the detection assembly comprises a first reciprocating screw rod and a limiting rod, the outer wall of the first reciprocating screw rod is connected with a mounting seat, and the bottom of the mounting seat is fixedly connected with a conductive pressing block. During detection, the upper conductive pressing block and the lower conductive pressing block are pressed on the surfaces of the two sides of the to-be-detected coated paper respectively, and then the conductive pressing blocks and the coated paper are conveyed at the same speed respectively; the upper conductive pressing block and the lower conductive pressing block are connected with each other and drive the marking mechanism to mark the section of coated paper, and long contact time exists between the conductive pressing blocks and the coated paper in the detection process, so that enough current conduction time is achieved, detection is more accurate, and the detection efficiency is improved. And moreover, relative sliding between the coated paper and the conductive pressing block is avoided in the detection process, so that the surface of the coated paper is not damaged.

Description

Technical Field

[0001] The invention relates to the technical field of laminated paper detection, in particular to a surface detection device used for laminated paper production. Background Art

[0002] Laminated paper is a composite material in which plastic particles are coated on the surface of paper through a casting machine. It has the properties of oil resistance, water resistance and heat sealing. During the processing of laminated paper, it is necessary to conduct a leak detection on it, that is, to detect whether the surface is sprayed with a laminate layer. The existing leak detection of laminated paper is mainly performed by passing the laminated paper through two upper and lower conductive rollers, that is, when there is a leaking position on the surface of the laminated paper, the upper and lower conductive rollers are connected to each other and an alarm is issued to perform leak detection. However, since the laminated paper is dynamically detected in this detection method, the contact time between the laminated paper and the conductive roller is short, which results in the detection part of the laminated paper having passed the conductive roller when the two conductive rollers are not yet connected, which is easy to cause inaccurate detection. For this reason, the present invention develops a surface detection device for laminated paper production to solve the above technical problems. Summary of the invention

[0003] The object of the present invention is to provide a surface detection device for laminated paper production to solve the technical problems raised by the above-mentioned background technology.

[0004] To achieve the above purpose, the technical solution provided by the present invention is: A surface detection device for laminated paper production, comprising a detection box, wherein an unwinding roller and a winding roller are respectively arranged at opposite ends of the detection box, and a detection component for detecting laminated paper is installed in the inner cavity of the detection box; The detection assembly includes an upper detection member and a lower detection member, each of which includes a first reciprocating screw and a limit rod installed in the inner cavity of the detection box, the outer wall of the first reciprocating screw is threadedly connected to a mounting seat, and the mounting seat is slidably connected to the limit rod, the top of the mounting seat is rotatably connected to two parallel reciprocating threaded sleeves, the bottom of the reciprocating threaded sleeve passes through the bottom of the mounting seat and is threadedly connected to a second reciprocating screw, a conductive voltage block is fixedly connected between the bottoms of the two second reciprocating screws, a rotating gear is installed on the outer wall of the reciprocating threaded sleeve through a one-way bearing, and the top and bottom of the inner cavity of the detection box are respectively fixedly connected to fixing bars, and the fixing bars are located at two Between the rotating gears, the opposite ends of the fixed bar are respectively provided with a first rack and a second rack meshing with the rotating gear. When the rotating gear is positively meshed with the first rack, the two conductive voltage blocks are driven to slide close to each other and press the coated paper. When the rotating gear is positively meshed with the second rack, the two conductive voltage blocks are driven to slide away from each other and release the coated paper. The side wall of the detection box is installed with a variable speed drive mechanism for driving the conductive voltage blocks to slide reciprocally, and the reverse sliding speed of the conductive voltage blocks is greater than the forward sliding speed. When the conductive voltage blocks press the coated paper, the sliding speed of the conductive voltage blocks is consistent with the winding speed of the coated paper. The detection component also includes a marking mechanism.

[0005] Preferably, the side wall of the detection box is equipped with a conductive slide rail electrically connected to an external power supply, and the side wall of the conductive voltage block is equipped with a conductive column cooperating with the conductive slide rail, and after the conductive column is separated from the conductive slide rail, the conductive voltage block is positively meshed with the second rack again.

[0006] Preferably, the marking mechanism includes mounting strips fixedly connected to the opposite side walls of the conductive voltage block, the two mounting strips located above are both slidably connected with sliding columns, the bottom of the sliding columns pass through the mounting strips and are installed with a first electromagnetic strip, a number of marking pens are installed at the bottom of the first electromagnetic strip, the outer wall of the sliding column located above the mounting strip is fixed with a spring, and a second electromagnetic strip that attracts the first electromagnetic strip is installed on one side of the mounting strip located below close to the marking pen, and when the upper and lower conductive voltage blocks are conductive, the first electromagnetic strip and the second electromagnetic strip attract each other.

[0007] Preferably, the marking head of the marking pen is arranged close to the side wall of the conductive voltage block.

[0008] Preferably, the speed change drive mechanism includes a driving motor, a steel belt continuously variable transmission and a variable diameter drive component, the driven pulley of the steel belt continuously variable transmission is sleeved on the outer wall of the first reciprocating screw rod, the driving pulley of the steel belt continuously variable transmission is sleeved on the outer wall of the output shaft of the driving motor, the driven pulley and the driving pulley are connected by a steel belt, and the variable diameter drive component is respectively connected to the sliding parts of the driven pulley and the driving pulley.

[0009] Preferably, the variable diameter drive member includes a screw rotatably connected to the side wall of the detection box, the outer wall of the screw is threadedly connected to a slider, the end of the slider is equipped with a push rod rotatably connected to the driven pulley and the driving pulley respectively, and the push rod drives the sliding parts of the driven pulley and the driving pulley to slide respectively.

[0010] Preferably, the driven pulley includes a driven fixed portion fixedly connected to the outer wall of the first reciprocating screw and a driven sliding portion slidably connected to the outer wall of the first reciprocating screw, and both the driven fixed portion and the driven sliding portion are conical, and the driving pulley includes an active fixed portion fixedly connected to the output end of the driving motor and an active sliding portion slidably connected to the output end of the driving motor, and both the active fixed portion and the active sliding portion are conical.

[0011] Preferably, the outer walls of the first reciprocating screw and the output shaft of the driving motor are both provided with limit keys, and the inner walls of the driven sliding part and the active sliding part are both provided with limit grooves that cooperate with the limit keys.

[0012] Preferably, the interior of the limit rod is a hollow structure and is coaxially arranged with the screw rod. The inner cavity of the limit rod is slidably connected to a sliding rod. One end of the sliding rod is inserted into the inner cavity of the screw rod. A limiting column is arranged on the outer wall of the end of the sliding rod inserted into the inner cavity of the screw rod. The inner cavity of the screw rod is provided with a spiral groove that cooperates with the limiting column. Limiting rings are fixedly connected to the opposite ends of the outer wall of the sliding rod, and the two limiting rings pass through the outer wall of the limit rod and are respectively located on opposite sides of the mounting seat.

[0013] Preferably, the limiting ring and the limiting rod are connected via two limiting strips, and the outer wall of the limiting rod is provided with a sliding groove that cooperates with the limiting strips.

[0014] Compared with the prior art, the present invention has the following beneficial effects: When the present invention performs leak-proof detection on coated paper, the upper and lower conductive voltage blocks are respectively pressed against the two side surfaces of the coated paper to be detected, and then the conductive voltage blocks and the coated paper are respectively conveyed at the same speed. During the conveying process, when there is an area on the surface of the coated paper of the detection section where the coating is not in place, the upper and lower conductive voltage blocks are mutually conductive and drive a marking mechanism to mark the section of coated paper. During this detection process, there is a long contact time between the conductive voltage blocks and the coated paper, so that there is sufficient current conduction time, thereby making the detection more accurate, and during the detection process, there is no relative sliding between the coated paper and the conductive voltage blocks, so that the surface of the coated paper is not damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the detection device of the present invention; Figure 2 It is a front view structural schematic diagram of the detection device of the present invention; Figure 3 for Figure 2 A schematic diagram of the structure enlargement at the center A; Figure 4 It is a schematic diagram of the side section structure of the detection device of the present invention; Figure 5 for Figure 4 A schematic diagram of the structure enlarged at B in the middle; Figure 6 It is a schematic diagram of a mounting base and its connecting components in the detection device of the present invention; Figure 7 for Figure 6 A schematic diagram of a side cross-section structure; Figure 8 It is a schematic structural diagram of the speed-changing drive mechanism in the detection device of the present invention.

[0017] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Detection box; 2. Unwinding roller; 3. Rewinding roller; 4. Detection assembly; 41. First reciprocating screw rod; 42. Limit rod; 421. Sliding rod; 422. Limit column; 423. Limit ring; 424. Limit strip; 43. Mounting seat; 44. Reciprocating threaded sleeve; 45. Second reciprocating screw rod; 46. Conductive voltage block; 47. Rotating gear; 48. Fixed strip; 49. First rack; 410. Second rack ; 411, speed-changing drive mechanism; 4111, driving motor; 4112, steel-belt continuously variable transmission; 4113, screw; 4114, slider; 4115, push rod; 412, conductive column; 413, marking mechanism; 4131, mounting strip; 4132, sliding column; 4133, first electromagnetic strip; 4134, marking pen; 4135, spring; 4136, second electromagnetic strip; 5, conductive slide rail. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 1-8 As shown: Embodiment 1 of the present invention is: A surface detection device for laminated paper production, comprising a detection box 1, a reel 2 and a reel 3 are respectively arranged at opposite ends of the detection box 1, and a detection component 4 for detecting laminated paper is installed in the inner cavity of the detection box 1; The detection assembly 4 includes an upper detection member and a lower detection member, each of which includes a first reciprocating screw rod 41 and a limit rod 42 installed in the inner cavity of the detection box 1. The outer wall of the first reciprocating screw rod 41 is threadedly connected with a mounting seat 43, and the mounting seat 43 is slidably connected with the limit rod 42. The top of the mounting seat 43 is rotatably connected with two parallel reciprocating threaded sleeves 44. The bottom of the reciprocating threaded sleeve 44 passes through the bottom of the mounting seat 43 and is threadedly connected with a second reciprocating screw rod 45. A conductive voltage block 46 is fixed between the bottoms of the two second reciprocating screw rods 45. A rotating gear 47 is installed on the outer wall of the reciprocating threaded sleeve 44 through a one-way bearing. The top and bottom of the inner cavity of the detection box 1 are respectively fixed with fixing bars 48, and the fixing bars 48 are located between the two rotating gears. Between the wheels 47, the opposite ends of the fixed bar 48 are respectively provided with a first rack 49 and a second rack 410 meshing with the rotating gear 47. When the rotating gear 47 is positively meshed with the first rack 49, the two conductive voltage blocks 46 are driven to slide close to each other and press the coated paper. When the rotating gear 47 is positively meshed with the second rack 410, the two conductive voltage blocks 46 are driven to slide away from each other and release the coated paper. The side wall of the detection box 1 is installed with a variable speed drive mechanism 411 for driving the conductive voltage block 46 to slide back and forth, and the speed of the reverse sliding of the conductive voltage block 46 is greater than the speed of the forward sliding. When the conductive voltage block 46 presses the coated paper, the sliding speed of the conductive voltage block 46 is consistent with the winding speed of the coated paper. The detection component 4 also includes a marking mechanism 413.

[0020] In this embodiment, in order to simplify the circuit connection in the detection box and prevent the circuit from sliding back and forth with the conductive voltage block, a conductive slide rail 5 electrically connected to the external power supply is installed on the side wall of the detection box body 1, and a conductive column 412 cooperating with the conductive slide rail 5 is installed on the side wall of the conductive voltage block 46. After the conductive column 412 is separated from the conductive slide rail 5, the conductive voltage block 46 is positively meshed with the second rack 410. When the conductive column contacts the conductive slide rail, the conductive voltage block is electrically connected to the external power supply, and then the coated paper is detected. When the conductive column is separated from the conductive slide rail, the two conductive voltage blocks are powered off, and at this time the conductive voltage blocks can be raised and lowered normally.

[0021] In this embodiment, in order to be able to mark the detected coated paper in time, the marking mechanism 413 includes mounting bars 4131 fixedly connected to the opposite side walls of the conductive voltage block 46, the two mounting bars 4131 located at the top are both penetrated by sliding columns 4132, the bottom of the sliding column 4132 passes through the mounting bar 4131 and is installed with a first electromagnetic bar 4133, a plurality of marking pens 4134 are installed at the bottom of the first electromagnetic bar 4133, the outer wall of the sliding column 4132 located above the mounting bar 4131 is fixedly connected to a spring 4135, and a portion of the mounting bar 4131 located at the bottom near the marking pen 4134 is fixedly connected to the outer wall of the sliding column 4132 located above the mounting bar 4131 A second electromagnetic strip 4136 is installed on the side, which is attracted to the first electromagnetic strip 4133. When the upper and lower conductive voltage blocks 46 are connected, the first electromagnetic strip 4133 and the second electromagnetic strip 4136 are attracted to each other. The marking head of the marking pen 4134 is arranged close to the side wall of the conductive voltage block 46. When the upper and lower conductive voltage blocks are connected to each other, the first electromagnetic strip and the second electromagnetic strip are energized and attracted to each other, so that the marking pen slides downward and marks the surface of the laminated paper. When the conductive voltage block is powered off, the first magnetic strip and the marking pen return to their original positions under the action of the spring restoring force, detach from the laminated paper, and complete the marking.

[0022] In this embodiment, the speed change drive mechanism 411 includes a driving motor 4111, a steel belt type continuously variable transmission 4112 and a variable diameter driving member, the driven pulley of the steel belt type continuously variable transmission 4112 is sleeved on the outer wall of the first reciprocating screw rod 41, the driving pulley of the steel belt type continuously variable transmission 4112 is sleeved on the outer wall of the output shaft of the driving motor 4111, the driven pulley and the driving pulley are connected by a steel belt, the variable diameter driving member is respectively connected to the sliding parts of the driven pulley and the driving pulley, the driven pulley includes a driven fixed part fixed to the outer wall of the first reciprocating screw rod 41 and a sliding part of the outer wall of the first reciprocating screw rod 41 The driven sliding part is dynamically connected to the output end of the driving motor 4111, and the driven fixed part and the driven sliding part are both conical. The driving pulley includes an active fixed part fixedly connected to the output end of the driving motor 4111 and an active sliding part slidably connected to the output end of the driving motor 4111, and the active fixed part and the active sliding part are both conical. When the speed is changed, the variable diameter driving part synchronously pushes the driven sliding part and the active sliding part to slide, and when the active sliding part approaches the active fixed part, the driven sliding part slides in the direction away from the driven fixed part, thereby realizing the simultaneous diameter change of the driving pulley and the driven pulley to realize the speed change.

[0023] In this embodiment, in order to realize automatic diameter-changing adjustment of the active pulley and the driven pulley, the diameter-changing driving member includes a screw rod 4113 rotatably connected to the side wall of the detection box body 1, the outer wall of the screw rod 4113 is threadedly connected to a slider 4114, and the end of the slider 4114 is provided with a push rod 4115 rotatably connected to the driven pulley and the active pulley, and the push rod 4115 drives the sliding parts of the driven pulley and the active pulley to slide respectively, and the interior of the limit rod 42 is a hollow structure and is coaxially arranged with the screw rod 4113, and the inner cavity of the limit rod 42 is slidably connected with a sliding rod 421, one end of the sliding rod 421 is inserted into the inner cavity of the screw 4113, and a limiting column 422 is arranged on the outer wall of one end of the sliding rod 421 inserted into the inner cavity of the screw 4113, and the inner cavity of the screw 4113 is provided with a threaded The two limiting rings 423 are fixedly connected to the opposite ends of the outer wall of the sliding rod 421, and the two limiting rings 423 pass through the outer wall of the limiting rod 42 and are respectively located on the opposite sides of the mounting seat 43. When the mounting seat slides back and forth driven by the first reciprocating screw, it can push the limiting block and the sliding rod to slide, and then the screw can be driven to rotate under the cooperation of the limiting column on the outer wall of the sliding rod and the spiral groove inside the screw, thereby driving the slider and the push rod to slide, realizing the variable diameter adjustment of the active pulley and the driven pulley, and during the entire adjustment process, the back and forth sliding of the sliding rod is transitioned through the screw, and the interlocking effect between the screw and the slider can be used to ensure the fixation of the push rod position, so that the diameters of the driven pulley and the active pulley can be fixed and will not change during the rotation of the driving motor, thereby ensuring the stability of the driving mechanism.

[0024] In this embodiment, the outer walls of the first reciprocating screw 41 and the output shaft of the driving motor 4111 are both provided with limit keys, and the inner walls of the driven sliding part and the active sliding part are both provided with limit grooves that cooperate with the limit keys.

[0025] In this embodiment, the limiting ring 423 and the limiting rod 42 are connected via two limiting strips 424 , and the outer wall of the limiting rod 42 is provided with a sliding groove that cooperates with the limiting strips 424 .

[0026] The specific working process of the above detection device is as follows: When testing coated paper, the coated paper roll to be tested is mounted on the unwinding roller 2, and then one end is pulled onto the winding roller 3, and then the winding motor and the driving motor 4111 of the winding roller 3 are started respectively (and the coated paper part that has passed through in advance is manually tested); The winding motor drives the winding roller 3 to rotate and rewind the coated paper, and the driving motor 4111 drives the first reciprocating screw rod 41 to rotate and drive the mounting seat 43 to slide in the positive direction (consistent with the conveying direction of the coated paper), and the positive sliding speed of the mounting seat 43 is consistent with the winding speed of the coated paper; during the positive sliding process of the mounting seat 43, the rotating gear 47 meshes with the first rack 49, thereby driving the reciprocating threaded sleeve 44 to rotate, driving the upper and lower conductive voltage blocks 46 to slide in the direction of approaching each other and Compress the coated paper, and then slide in the positive direction at the same speed as the coated paper. After the compression, the conductive column 412 on the side wall of the conductive voltage block 46 contacts the conductive slide rail 5, so that the conductive voltage block 46 is energized. At this time, when there is an area of ​​the coated paper between the two conductive voltage blocks 46 that has not been sprayed in place, the upper and lower conductive voltage blocks 46 can be mutually conductive to form a closed loop. When there is no area of ​​the coated paper between the two conductive voltage blocks 46 that has not been sprayed in place, the two conductive voltage blocks 46 are not conductive; When the upper and lower conductive voltage blocks 46 are connected to each other, the first electromagnetic strip 4133 and the second electromagnetic strip 4136 on the side wall of the conductive voltage block 46 are energized and attract each other, so that the marking pen 4134 on the first electromagnetic strip 4133 descends and marks the coated paper in this section. Then, when the conductive column 412 separates from the conductive slide rail 5, the first electromagnetic strip 4133 and the second electromagnetic strip 4136 are de-energized, and the first electromagnetic strip 4133 and the marking pen 4134 return to their original positions under the action of the restoring force of the spring 4135, completing the detection and marking.

[0027] After the detection is completed, the mounting seat 43 continues to slide forward for a distance, and the rotating gear 47 is meshed with the second rack 410, thereby driving the upper and lower conductive voltage blocks 46 to slide away from each other and detach from the coated paper. At the same time, the mounting seat 43 contacts the limiting ring 423 on this side and pushes the limiting ring 423 and the sliding rod 421 to slide, and then the screw 4113 is driven to rotate forward through the mutual cooperation between the limiting column 422 and the spiral groove, thereby driving the slider 4114 and the push rod 4115 to slide forward, respectively pulling the active sliding part and the driven sliding part to slide in opposite directions. , adjust the diameters of the driven pulley and the driving pulley to increase the rotation speed of the first reciprocating screw 41. After the adjustment is in place, the mounting seat 43 slides to the end of the first reciprocating screw 41, so that it can slide in the reverse direction under the continuous drive of the first reciprocating screw 41, and the reverse sliding speed is greater than the forward sliding speed and the transmission speed of the coated paper. During the reverse sliding process, since the rotating gear 47 and the reciprocating threaded sleeve 44 are connected by a one-way bearing, the reverse meshing of the rotating gear 47 with the second rack 410 and the first rack 49 will cause the rotating gear 47 to idle. During the process of the mounting seat 43 quickly sliding in the reverse direction to the other end of the first reciprocating screw 41, the limiting ring 423 at that end is pushed to slide, so that the sliding rod 421 slides in the reverse direction, thereby the screw 4113 rotates in the reverse direction through the cooperation between the limiting column 422 and the spiral groove, driving the driven pulley and the active pulley to readjust the diameter, and adjusting the rotation speed of the first reciprocating screw 41 to be consistent with the transmission speed of the coated paper.

[0028] Then the mounting seat 43 continues to slide forward, driving the conductive voltage block 46 to slide, and causing the rotating gear 47 to mesh with the first rack 49 again, driving the conductive voltage block 46 to press the coated paper to be tested again and perform the test.

[0029] In this embodiment, the reverse sliding speed of the mounting seat 43 can be twice or more than twice the forward sliding speed, and during detection, the conductive voltage block 46 can repeatedly detect a partial area of ​​the laminated paper, thereby achieving uninterrupted detection of the laminated paper.

[0030] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A surface detection device for laminated paper production, characterized in that: It comprises a detection box (1), wherein an unwinding roller (2) and a rewinding roller (3) are respectively arranged at two opposite ends of the detection box (1), and a detection component (4) for detecting coated paper is installed in the inner cavity of the detection box (1); The detection assembly (4) comprises an upper detection member and a lower detection member, each of which comprises a first reciprocating screw (41) and a limit rod (42) mounted in the inner cavity of the detection box (1); the outer wall of the first reciprocating screw (41) is threadedly connected to a mounting seat (43), and the mounting seat (43) is slidably connected to the limit rod (42); the top of the mounting seat (43) is rotatably connected to two parallel reciprocating threaded sleeves (44); the bottom of the reciprocating threaded sleeve (44) passes through the bottom of the mounting seat (43) and is threadedly connected to a second reciprocating screw (45); a conductive voltage block (46) is fixedly connected between the bottoms of the two second reciprocating screws (45); a rotating gear (47) is mounted on the outer wall of the reciprocating threaded sleeve (44) via a one-way bearing; the top and bottom of the inner cavity of the detection box (1) are respectively fixedly connected to fixing bars (48), and the fixing bars (48) are located at two Between the rotating gears (47), the opposite ends of the fixed bar (48) are respectively provided with a first rack (49) and a second rack (410) meshed with the rotating gear (47). When the rotating gear (47) is meshed with the first rack (49) in a positive direction, the two conductive voltage blocks (46) are driven to slide towards each other and press the coated paper. When the rotating gear (47) is meshed with the second rack (410) in a positive direction, the two conductive voltage blocks (46) are driven to slide away from each other and release the coated paper. The side wall of the detection box (1) is installed with a variable speed drive mechanism (411) for driving the conductive voltage blocks (46) to slide back and forth, and the speed of the reverse sliding of the conductive voltage blocks (46) is greater than the speed of the forward sliding. When the conductive voltage blocks (46) press the coated paper, the sliding speed of the conductive voltage blocks (46) is consistent with the winding speed of the coated paper. The detection component (4) also includes a marking mechanism (413).

2. The surface detection device for laminated paper production according to claim 1, characterized in that: The side wall of the detection box (1) is mounted with a conductive slide rail (5) electrically connected to an external power supply, and the side wall of the conductive voltage block (46) is mounted with a conductive column (412) that cooperates with the conductive slide rail (5), and after the conductive column (412) is separated from the conductive slide rail (5), the conductive voltage block (46) is positively meshed with the second rack (410).

3. The surface detection device for laminated paper production according to claim 1, characterized in that: The marking mechanism (413) comprises a mounting bar (4131) fixedly connected to opposite side walls of the conductive voltage block (46); the two mounting bars (4131) located at the top are both penetrated by a sliding column (4132) in sliding connection; the bottom of the sliding column (4132) passes through the mounting bar (4131) and is installed with a first electromagnetic bar (4133); a plurality of marking pens (4134) are installed at the bottom of the first electromagnetic bar (4133); a spring (4135) is fixedly connected to the outer wall of the sliding column (4132) located above the mounting bar (4131); a second electromagnetic bar (4136) that attracts the first electromagnetic bar (4133) is installed on a side surface of the mounting bar (4131) close to the marking pens (4134); and when the upper and lower conductive voltage blocks (46) are conductive, the first electromagnetic bar (4133) and the second electromagnetic bar (4136) attract each other.

4. The surface detection device for laminated paper production according to claim 3, characterized in that: The marking head of the marking pen (4134) is arranged close to the side wall of the conductive voltage block (46).

5. The surface detection device for laminated paper production according to claim 1, characterized in that: The speed-changing drive mechanism (411) comprises a driving motor (4111), a steel-belt continuously variable transmission (4112) and a variable-diameter driving member, wherein a driven pulley of the steel-belt continuously variable transmission (4112) is sleeved on the outer wall of a first reciprocating screw rod (41), and a driving pulley of the steel-belt continuously variable transmission (4112) is sleeved on the outer wall of an output shaft of the driving motor (4111), the driven pulley and the driving pulley are connected via a steel belt, and the variable-diameter driving member is respectively connected to the sliding parts of the driven pulley and the driving pulley.

6. The surface detection device for laminated paper production according to claim 5, characterized in that: The variable diameter drive member comprises a screw rod (4113) rotatably connected to the side wall of the detection box body (1); the outer wall of the screw rod (4113) is threadedly connected to a slider (4114); the end of the slider (4114) is provided with a push rod (4115) rotatably connected to the driven pulley and the driving pulley respectively; and the push rod (4115) drives the sliding parts of the driven pulley and the driving pulley to slide respectively.

7. The surface detection device for laminated paper production according to claim 5, characterized in that: The driven pulley comprises a driven fixed portion fixedly connected to the outer wall of the first reciprocating screw (41) and a driven sliding portion slidably connected to the outer wall of the first reciprocating screw (41), and both the driven fixed portion and the driven sliding portion are conical. The active pulley comprises an active fixed portion fixedly connected to the output end of the drive motor (4111) and an active sliding portion slidably connected to the output end of the drive motor (4111), and both the active fixed portion and the active sliding portion are conical.

8. The surface detection device for laminated paper production according to claim 7, characterized in that: The first reciprocating screw (41) and the outer wall of the output shaft of the driving motor (4111) are both provided with a limit key, and the inner walls of the driven sliding part and the active sliding part are both provided with a limit groove that cooperates with the limit key.

9. The surface detection device for laminated paper production according to claim 6, characterized in that: The interior of the limit rod (42) is a hollow structure and is coaxially arranged with the screw rod (4113). The inner cavity of the limit rod (42) is slidably connected with a sliding rod (421). One end of the sliding rod (421) is inserted into the inner cavity of the screw rod (4113). A limit column (422) is arranged on the outer wall of the end of the sliding rod (421) inserted into the inner cavity of the screw rod (4113). The inner cavity of the screw rod (4113) is provided with a spiral groove that cooperates with the limit column (422). The outer wall of the sliding rod (421) is fixedly connected to limit rings (423) at opposite ends, and the two limit rings (423) pass through the outer wall of the limit rod (42) and are respectively located on opposite sides of the mounting seat (43).

10. The surface detection device for laminated paper production according to claim 7, characterized in that: The limiting ring (423) and the limiting rod (42) are connected via two limiting strips (424), and a sliding groove cooperating with the limiting strips (424) is provided on the outer wall of the limiting rod (42).

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