Printing quality inspection equipment

Abstract

The invention provides printing quality inspection equipment, and relates to the technical field of visual inspection. The printing quality inspection equipment comprises a rack, first sleeves, first springs, tensioning wheels and an industrial camera, the industrial camera is arranged at the upper end in the rack, the two first sleeves are arranged at the lower end in the rack and can move towards each other or away from each other, the tensioning wheels are arranged at the upper ends of the first sleeves, and the first springs are arranged in the first sleeves and connected with the tensioning wheels. And when the tensioning wheels vertically move downwards relative to the first sleeve, the industrial camera is driven to synchronously and vertically move downwards. When the tensioning wheel vertically moves downwards relative to the first sleeve, the industrial camera is driven to move synchronously, so that the distance between a label and the industrial camera is kept unchanged all the time, and it is guaranteed that the detection precision of the industrial camera is not affected by tensioning movement of the label; when the thicknesses of the label materials are inconsistent, the distance adjustment of the first sleeve ensures that the tensioning wheel applies uniform pressure to the label, and the industrial camera always adaptively adjusts the distance.

Description

Technical Field

[0001] This invention relates to the field of visual inspection technology, and more particularly to a printing quality inspection device. Background Technology

[0002] A label is an information sticker that helps people identify product information. It is usually affixed to a part of the product. During the production process, labels are printed, and the printing quality directly affects whether people can recognize the information on the label. A label printing quality inspection device is a device that can detect whether the label printing quality is up to standard.

[0003] However, in actual testing, as the outer diameter of the label roll increases, the label tension increases, requiring adjustment of the label tension by moving the tensioning wheel. The distance between the label and the industrial camera changes during label movement, which can easily affect the accuracy of quality inspection. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a printing quality inspection device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A printing quality inspection device includes a frame, a first sleeve, a first spring, a tensioning wheel, and an industrial camera. The industrial camera is vertically mounted on the upper inner side of the frame. Two first sleeves are symmetrically mounted on the lower inner side of the frame. The two first sleeves can move synchronously towards or away from each other in a horizontal straight line. The tensioning wheel is rotatably mounted on the upper end of the first sleeve. The first spring is mounted inside the first sleeve and connected to the tensioning wheel. The two tensioning wheels always move synchronously up and down. When the tensioning wheel moves vertically downward relative to the first sleeve, it drives the industrial camera to move synchronously vertically downward.

[0006] Preferably, sliders are symmetrically fixed at the lower ends of both sides of the first sleeve. A bidirectional threaded screw and a guide rod are respectively threaded inside the sliders on both sides. Support plates are symmetrically fixed at both ends of the guide rods. The ends of the support plates are fixed to the inner side wall of the frame. The outer ends of the bidirectional threaded screws are rotatably connected to the inner side wall of the corresponding support plates through bearings. A servo motor is fixedly installed on the side of the support plate. The output shaft of the servo motor is fixedly connected to the end of the bidirectional threaded screw.

[0007] Preferably, a first piston plate is slidably connected to the inner surface of the first sleeve, the first spring is fastened between the bottom end of the first piston plate and the inner bottom surface of the first sleeve, a first lifting rod is fixedly connected to the middle of the upper end of the first piston plate, and the tensioning wheel is rotatably disposed on the upper end of the first lifting rod.

[0008] Preferably, a U-shaped frame is fixedly connected to the top of the first lifting rod, and the tensioning wheel is rotatably connected to the inside of the U-shaped frame through a positioning pin.

[0009] Preferably, a sleeve and a telescopic rod are horizontally fixedly connected at opposite positions on the outer sides of the two first lifting rods, the sleeve and the telescopic rod are coaxially arranged and the outer surface of the telescopic rod is slidably connected to the inner surface of the sleeve, and the sleeve always covers the outer side of the telescopic rod.

[0010] Preferably, the industrial camera has a second sleeve at its upper end, a second piston plate slidably connected to the inner surface of the second sleeve, a second lifting rod fixedly connected to the middle of the bottom end of the second piston plate, a second spring sleeved on the outer side of the second lifting rod, the second spring being fastened between the bottom end of the second piston plate and the inner bottom surface of the second sleeve, an air hole opened at the middle of the bottom end of the second sleeve, the second lifting rod being located at the middle of the air hole, a gap existing between the second lifting rod and the air hole, a round hole opened on the upper side wall of the second sleeve, a mounting plate fixedly installed at the bottom end of the second lifting rod, the industrial camera being fixedly installed at the bottom end of the mounting plate, and the second sleeve being located at the upper end of the two first sleeves.

[0011] Preferably, a first flexible hose is fastened between the middle of the bottom ends of the two first sleeves, a second flexible hose is fixedly connected to the round hole of the second sleeve, the end of the second flexible hose opposite to the round hole is fixedly connected to the side wall of the first flexible hose, and hydraulic oil is filled in the upper space of the second piston plate, the first flexible hose, the second flexible hose and the lower space of the two first sleeves.

[0012] Preferably, the first hose and the second hose do not interfere with the movement of the first sleeve and the second sleeve.

[0013] Preferably, an electric guide rail is fixedly installed on the upper end of the inner side wall of the frame, the electric guide rail includes a slide, a lifting plate is fixedly connected to the side of the slide, and a second sleeve is vertically fixed at the bottom end of the lifting plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the elastic force of the first spring adaptively adjusts the tension of the label, avoiding stretching and damage of the label due to excessive tension, which would affect quality inspection; the tensioning wheel moves vertically downward relative to the first sleeve at the same time, driving the industrial camera to move vertically downward simultaneously, so that the distance between the label being inspected and the imaging surface of the industrial camera remains constant, thereby ensuring that the detection accuracy of the industrial camera is not affected by the movement of the label tensioning; when the label material thickness is inconsistent, adjusting the distance between the two first sleeves can ensure that the tensioning wheel always applies uniform pressure to the label, avoiding tension failure due to the label being too thick or too thin, which would affect the detection accuracy; and in both cases, the industrial camera always adaptively adjusts the distance when the label moves downward due to tensioning, so as to ensure that the detection accuracy is not affected. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the printing quality inspection equipment according to an embodiment of the present invention; Figure 2 This is a schematic diagram showing the positional relationship of the second hose in the printing quality inspection equipment according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the second sleeve in the printing quality inspection equipment according to an embodiment of the present invention; Figure 4 This is a schematic diagram showing the position of the second piston plate when the second spring is not compressed in the printing quality inspection equipment according to an embodiment of the present invention; Figure 5 This is a schematic diagram showing the position of the second piston plate when the second spring is compressed in the printing quality inspection equipment according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal structure of the first sleeve in the printing quality inspection equipment according to an embodiment of the present invention; Figure 7 This is a schematic diagram showing the position of the first piston plate when the first spring is not compressed in the printing quality inspection equipment according to an embodiment of the present invention; Figure 8 This is a schematic diagram showing the position of the first piston plate when the first spring is compressed in the printing quality inspection equipment of this embodiment of the invention.

[0016] In the diagram: 100, frame; 200, support plate; 201, double-threaded screw; 202, guide rod; 203, servo motor; 204, slider; 300, first sleeve; 301, first piston plate; 302, first spring; 303, first lifting rod; 400, U-shaped frame; 401, tension wheel; 500, sleeve; 501, telescopic rod; 600, second sleeve; 601, second piston plate; 602, second lifting rod; 603, second spring; 604, air hole; 605, mounting plate; 606, industrial camera; 700, first flexible hose; 701, second flexible hose; 800, electric guide rail; 801, slide; 802, lifting plate. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0019] like Figure 1-8 As shown, this embodiment of the invention provides a printing quality inspection device, including a frame 100, a first sleeve 300, a first spring 302, a tensioning wheel 401, and an industrial camera 606. The industrial camera 606 is vertically mounted on the upper inner side of the frame 100. Two first sleeves 300 are symmetrically mounted on the lower inner side of the frame 100. The two first sleeves 300 can move synchronously towards each other or away from each other in a straight line along the horizontal direction. The tensioning wheel 401 is rotatably mounted on the upper end of the first sleeve 300. The first spring 302 is mounted inside the first sleeve 300 and connected to the tensioning wheel 401. The two tensioning wheels 401 always move synchronously up and down. When the tensioning wheel 401 moves vertically downward relative to the first sleeve 300, it drives the industrial camera 606 to move vertically downward synchronously.

[0020] In this embodiment, the label is printed during the production process. After printing, the printing quality needs to be inspected. The label paper is unwound from the unwinding roller, passes through the top of the two tension rollers 401, and is finally wound onto the take-up roller. The industrial camera 606 scans the label between the two tension rollers 401 at a high line frequency, converting the light signal into an electrical signal and then reconstructing it into a digital image. The system compares the acquired image with a standard template and identifies defects such as missing text, color deviation, and ink spots through a hybrid algorithm. During the label conveying process, the first spring 302 located in the first sleeve 300 pushes the tension rollers 401 upward to tension the label, preventing the label from loosening and curling, which would affect the inspection quality of the industrial camera 606. 1. The labels are always raised and lowered synchronously, so the label located between the two tension rollers 401 will not tilt to one side. This ensures that the label is tensioned while also ensuring that the surface of the label being inspected is always facing the industrial camera 606, so as to ensure that the inspection quality is not affected. As the outer diameter of the label wound on the take-up roller increases, the tension of the label increases, thereby generating downward pressure on the two tension rollers 401. This causes the two tension rollers 401 to move vertically downward relative to the first sleeve 300 synchronously. When the tension rollers 401 move vertically downward, they compress the first spring 302 inside the first sleeve 300. Then, the first spring 302 generates an upward reaction force due to deformation, which makes the tension rollers 401 reach positional balance. That is, the elastic force of the first spring 302 adaptively adjusts the position. The tension of the label is controlled to prevent stretching and breakage due to excessive tension, which would affect quality inspection. Simultaneously, the tensioning wheel 401 moves vertically downward relative to the first sleeve 300, driving the industrial camera 606 to move vertically downward simultaneously. This ensures that the distance between the label's inspected surface and the camera's imaging surface remains constant, thus guaranteeing that the inspection accuracy of the industrial camera 606 is not affected by the label's tensioning movement. When inspecting thinner labels, the distance between the two first sleeves 300 is adjusted so that they move synchronously in opposite directions horizontally until the distance between them is close. This is because if the distance between the two tensioning wheels 401 is too large when tensioning thinner labels, it may cause damage. Label slack affects detection accuracy. Adjusting the distance between the two first sleeves 300 to be closer ensures that thinner labels are always under tension. When inspecting thicker labels, adjust the distance between the two first sleeves 300 so that they move synchronously and separately in a horizontal straight line until the distance between them is greater. This is because if the distance between the two tensioning rollers 401 is small when a thick label is being tensioned, wrinkles may appear due to label bending, affecting detection accuracy. Therefore, when the label material thickness is inconsistent, adjusting the distance between the two first sleeves 300 ensures that the tensioning rollers 401 always apply uniform pressure to the label, preventing tension failure due to excessively thick or thin labels, which would affect detection accuracy.Furthermore, in both cases, the industrial camera 606 adaptively adjusts the spacing as the label moves downwards due to tension. The elastic force of the first spring 302 adaptively adjusts the tension of the label, preventing the label from stretching or breaking due to excessive tension, which would affect quality inspection. The tensioning wheel 401 moves vertically downward relative to the first sleeve 300, simultaneously driving the industrial camera 606 to move vertically downward, ensuring that the distance between the label's inspected surface and the imaging surface of the industrial camera 606 remains constant. This guarantees that the detection accuracy of the industrial camera 606 will not be affected by the label's tensioning movement. When the label material thickness is inconsistent, adjusting the distance between the two first sleeves 300 ensures that the tensioning wheel 401 always applies uniform pressure to the label, preventing tension failure due to excessively thick or thin labels, which would affect detection accuracy. Furthermore, in both cases, the industrial camera 606 adaptively adjusts the distance as the label moves downward due to tension, ensuring that detection accuracy is not affected.

[0021] like Figure 1 As shown, optionally, sliders 204 are symmetrically fixed at the lower ends of both sides of the first sleeve 300. The sliders 204 are respectively threaded with bidirectional threaded screws 201 and slidably connected with guide rods 202. Support plates 200 are symmetrically fixed at both ends of the guide rods 202. The ends of the support plates 200 are fixed to the inner side wall of the frame 100. The outer ends of the bidirectional threaded screws 201 are rotatably connected to the corresponding side wall of the support plate 200 through bearings. A servo motor 203 is fixedly installed on the side of the support plate 200. The output shaft of the servo motor 203 is fixedly connected to the end of the bidirectional threaded screw 201.

[0022] In this embodiment, the output shaft of the servo motor 203 drives the bidirectional threaded screw 201 to rotate, which in turn drives the two first sleeves 300 to move synchronously towards or away from each other in a horizontal direction via the slider 204. This, in turn, drives the two tensioning rollers 401 located at the upper end of the first sleeves 300 to move synchronously towards or away from each other in a horizontal direction. This allows for adjustment of the distance between the two tensioning rollers 401. When tensioning thinner labels, adjusting the distance between the two tensioning rollers 401 to be closer can prevent the labels from becoming loose. When tensioning thicker labels, adjusting the distance between the two tensioning rollers 401 to be farther can prevent wrinkles caused by label bending, which would affect the detection accuracy.

[0023] like Figure 6 As shown, optionally, a first piston plate 301 is slidably connected to the inner surface of the first sleeve 300, a first spring 302 is fastened between the bottom end of the first piston plate 301 and the inner bottom surface of the first sleeve 300, a first lifting rod 303 is fixedly connected to the middle of the upper end of the first piston plate 301, and a tensioning wheel 401 is rotatably disposed on the upper end of the first lifting rod 303.

[0024] In this embodiment, during the label conveying process, the first spring 302 pushes the tensioning wheel 401 upward to tension the label through the first piston plate 301 and the first lifting rod 303, preventing the label from loosening and curling, which would affect the detection quality of the industrial camera 606. As the outer diameter of the label wound on the take-up roller increases, the tension force of the label increases, thereby generating downward pressure on the tensioning wheel 401, causing the tensioning wheel 401 to move vertically downward relative to the first sleeve 300. When the tensioning wheel 401 moves vertically downward, it compresses the first spring 302 through the first piston plate 301. Then, the first spring 302 generates an upward reaction force due to deformation, causing the tensioning wheel 401 to reach positional balance. That is, the elastic force of the first spring 302 adaptively adjusts the tension force of the label, preventing the label from being stretched or damaged due to excessive tension, which would affect the quality detection.

[0025] like Figure 6 As shown, optionally, a U-shaped frame 400 is fixedly connected to the top of the first lifting rod 303, and the tensioning wheel 401 is rotatably connected to the inside of the U-shaped frame 400 through a positioning pin.

[0026] In this embodiment, the tensioning rollers 401 can rotate relative to each other inside the U-shaped frame 400. During the label conveying process, the label passes through the upper end of the two tensioning rollers 401 and drives the two tensioning rollers 401 to rotate. The rotation of the two tensioning rollers 401 can reduce the friction experienced by the label during conveying, so as to protect the label from damage.

[0027] like Figure 6 and Figure 7 As shown, optionally, a sleeve 500 and a telescopic rod 501 are horizontally fixedly connected at opposite positions on the outer sides of the two first lifting rods 303, respectively. The sleeve 500 and the telescopic rod 501 are coaxially arranged and the outer surface of the telescopic rod 501 is slidably connected to the inner surface of the sleeve 500. The sleeve 500 always covers the outer side of the telescopic rod 501.

[0028] In this embodiment, when the label tension increases, the tensioning wheel 401 is driven to move vertically downward relative to the first sleeve 300. Since the sleeve 500 is fitted on the outside of the telescopic rod 501, the connection between the sleeve 500 and the telescopic rod 501 makes the two first lifting rods 303 form a whole. Then, the two tensioning wheels 401 move vertically downward synchronously relative to the first sleeve 300 through the two first lifting rods 303 forming a whole. Since the two tensioning wheels 401 rise and fall synchronously, the label located between the two tensioning wheels 401 will not tilt to one end. While ensuring that the label is tensioned, it also ensures that the surface of the label being detected is always facing the industrial camera 606, so as to ensure that the detection quality is not affected. During the adjustment of the distance between the two first sleeves 300, the sleeve 500 is always fitted on the outside of the telescopic rod 501 to ensure that the two tensioning wheels 401 rise and fall synchronously under any circumstances.

[0029] like Figure 1-3 As shown, optionally, the industrial camera 606 has a second sleeve 600 at its upper end. A second piston plate 601 is slidably connected to the inner surface of the second sleeve 600. A second lifting rod 602 is fixedly connected to the middle of the bottom end of the second piston plate 601. A second spring 603 is sleeved on the outer side of the second lifting rod 602. The second spring 603 is fastened between the bottom end of the second piston plate 601 and the inner bottom surface of the second sleeve 600. An air hole 604 is opened in the middle of the bottom end of the second sleeve 600. The second lifting rod 602 is located in the middle of the air hole 604. There is a gap between the second lifting rod 602 and the air hole 604. A round hole is opened on the upper side wall of the second sleeve 600. An installation plate 605 is fixedly installed at the bottom end of the second lifting rod 602. The industrial camera 606 is fixedly installed at the bottom end of the installation plate 605. The second sleeve 600 is located at the upper end of the two first sleeves 300.

[0030] In this embodiment, the second piston plate 601 slides against the inner side of the second sleeve 600, and the second spring 603 is connected between the second piston plate 601 and the inner bottom surface of the second sleeve 600, so that the second lifting rod 602 can drive the industrial camera 606 to move vertically. The space formed by the upper end of the second piston plate 601 and the side wall of the second sleeve 600 is the first space, and the space formed by the lower end of the second piston plate 601 and the side wall of the second sleeve 600 is the second space. When the second piston plate 601 moves vertically, the first space and the second space become larger or smaller, which requires air intake and exhaust. Through the structural design of the round hole and the air hole 604, the air intake and exhaust of the first space and the second space are ensured to proceed smoothly, thereby ensuring that the second piston plate 601 moves vertically smoothly.

[0031] like Figure 1-8 As shown, optionally, a first hose 700 is fastened between the middle of the bottom ends of the two first sleeves 300, and a second hose 701 is fixedly connected to the round hole of the second sleeve 600. The end of the second hose 701 facing away from the round hole is fixedly connected to the side wall of the first hose 700. The upper space of the second piston plate 601, the first hose 700, the second hose 701, and the lower space of the two first sleeves 300 are all filled with hydraulic oil.

[0032] In this embodiment, the lower space of the first sleeve 300 is the space formed by the bottom end of the first piston plate 301 and the side wall of the first sleeve 300. This space is the third space. When the tension wheel 401 moves vertically downward relative to the first sleeve 300, it drives the first piston plate 301 to move vertically downward relative to the first sleeve 300 and compresses the first spring 302. At this time, the hydraulic oil in the two third spaces is squeezed outward and discharged. The squeezed hydraulic oil enters the first space through the first hose 700 and the second hose 701. At this time, the hydraulic oil in the first space increases. Then, the hydraulic oil squeezes the second piston plate 601 to move vertically downward relative to the first sleeve 300, and then drives the industrial camera 606 to move vertically downward synchronously through the second lifting rod 602. That is, when the tension wheel 401 moves vertically downward relative to the first sleeve 300, it drives the industrial camera 606 to move vertically downward synchronously, so that the distance between the label detection surface and the imaging surface of the industrial camera 606 remains unchanged, thereby ensuring that the detection accuracy of the industrial camera 606 is not affected by the label tensioning movement.

[0033] like Figure 1 and Figure 2 As shown, optionally, the first hose 700 and the second hose 701 do not interfere with the movement of the first sleeve 300 and the second sleeve 600.

[0034] In this embodiment, the first hose 700 and the second hose 701 do not interfere with the movement of the first sleeve 300 and the second sleeve 600, so as to ensure the rationality of the structure.

[0035] like Figure 1 As shown, optionally, an electric guide rail 800 is fixedly installed on the upper end of the inner side wall of the frame 100. The electric guide rail 800 includes a slide 801. A lifting plate 802 is fixedly connected to the side of the slide 801. A second sleeve 600 is vertically fixed at the bottom end of the lifting plate 802.

[0036] In this embodiment, the electric guide rail 800 is existing technology, and its structure and working principle will not be described in detail here. The slide 801 can drive the lifting plate 802 to rise and fall vertically, and then drive the industrial camera 606 to rise and fall vertically through the second sleeve 600. By adjusting the height of the industrial camera 606, a suitable position can be adjusted to improve the detection accuracy of the label by the industrial camera 606.

[0037] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A printing quality inspection device, characterized in that, The system includes a frame (100), a first sleeve (300), a first spring (302), a tensioning wheel (401), and an industrial camera (606). The industrial camera (606) is vertically mounted on the upper inner side of the frame (100). Two first sleeves (300) are symmetrically mounted on the lower inner side of the frame (100). The two first sleeves (300) can move synchronously towards each other or away from each other in a straight line along the horizontal direction. The tensioning wheel (401) is rotatably mounted on the upper end of the first sleeve (300). The first spring (302) is mounted inside the first sleeve (300) and connected to the tensioning wheel (401). The two tensioning wheels (401) always move synchronously up and down. When the tensioning wheel (401) moves vertically downward relative to the first sleeve (300), it drives the industrial camera (606) to move vertically downward synchronously.

2. The printing quality inspection equipment according to claim 1, characterized in that, The lower ends of the first sleeve (300) are symmetrically fixed with sliders (204). The sliders (204) on both sides are respectively threaded with a bidirectional threaded screw (201) and slidably connected with a guide rod (202). The guide rod (202) is symmetrically fixed with support plates (200) at both ends. The end of the support plate (200) is fixed on the inner side wall of the frame (100). The outer ends of the bidirectional threaded screw (201) are rotatably connected to the side wall of the corresponding support plate (200) through bearings. A servo motor (203) is fixedly installed on the side of the support plate (200). The output shaft of the servo motor (203) is fixedly connected to the end of the bidirectional threaded screw (201).

3. The printing quality inspection equipment according to claim 1, characterized in that, The inner surface of the first sleeve (300) is slidably connected to the first piston plate (301), the first spring (302) is fastened between the bottom end of the first piston plate (301) and the inner bottom surface of the first sleeve (300), the middle of the upper end of the first piston plate (301) is fixedly connected to the first lifting rod (303), and the tensioning wheel (401) is rotatably disposed on the upper end of the first lifting rod (303).

4. The printing quality inspection equipment according to claim 3, characterized in that, The top end of the first lifting rod (303) is fixedly connected to a U-shaped frame (400), and the tensioning wheel (401) is rotatably connected to the inside of the U-shaped frame (400) through a positioning pin.

5. The printing quality inspection equipment according to claim 3, characterized in that, A sleeve (500) and a telescopic rod (501) are respectively horizontally fixed at opposite positions on the outer sides of the two first lifting rods (303). The sleeve (500) and the telescopic rod (501) are coaxially arranged and the outer surface of the telescopic rod (501) and the inner surface of the sleeve (500) are slidably connected to each other. The sleeve (500) always covers the outside of the telescopic rod (501).

6. The printing quality inspection equipment according to claim 1, characterized in that, The industrial camera (606) has a second sleeve (600) at its upper end. A second piston plate (601) is slidably connected to the inner surface of the second sleeve (600). A second lifting rod (602) is fixedly connected to the middle of the bottom end of the second piston plate (601). A second spring (603) is sleeved on the outer side of the second lifting rod (602). The second spring (603) is fastened between the bottom end of the second piston plate (601) and the inner bottom surface of the second sleeve (600). A vent (604) is provided at the middle of the bottom end of the second sleeve (600). The second lifting rod (602) is located in the middle of the vent (604). There is a gap between the second lifting rod (602) and the vent (604). A round hole is provided on the upper side wall of the second sleeve (600). An installation plate (605) is fixedly provided at the bottom end of the second lifting rod (602). An industrial camera (606) is fixedly installed at the bottom end of the installation plate (605). The second sleeve (600) is located at the upper end of the two first sleeves (300).

7. The printing quality inspection equipment according to claim 6, characterized in that, A first hose (700) is fastened between the middle of the bottom ends of the two first sleeves (300). A second hose (701) is fixedly connected to the round hole of the second sleeve (600). The end of the second hose (701) opposite to the round hole is fixedly connected to the side wall of the first hose (700). The upper space of the second piston plate (601), the first hose (700), the second hose (701) and the lower space of the two first sleeves (300) are all filled with hydraulic oil.

8. The printing quality inspection equipment according to claim 7, characterized in that, The first hose (700) and the second hose (701) never interfere with the movement of the first sleeve (300) and the second sleeve (600).

9. The printing quality inspection equipment according to claim 1, characterized in that, An electric guide rail (800) is fixedly installed on the upper end of the inner side wall of the frame (100). The electric guide rail (800) includes a slide (801). A lifting plate (802) is fixedly connected to the side of the slide (801). A second sleeve (600) is vertically fixed at the bottom end of the lifting plate (802).

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