Hydraulic cylinder external leakage real-time monitoring device and method based on visual inspection

Abstract

The invention discloses a hydraulic cylinder external leakage real-time monitoring device and method based on visual inspection, relates to the technical field of hydraulic cylinder monitoring, and aims to solve the problem that the external leakage condition of a hydraulic cylinder cannot be monitored in real time in the prior art. A first dustproof ring and a second dustproof ring are clamped at the positions, close to the piston rod, of the front ends of the detection device installation base and the guide sleeve respectively, a visual detector is arranged on the detection device installation base, and the first dustproof ring, the detection device installation base, the visual detector, the second dustproof ring and the piston rod define a closed space. The visual detector is in electric signal connection with the PLC system terminal, and the visual detector can detect the leakage condition outside the closed space and transmit the leakage condition to the PLC system terminal through an electric signal. The device is simple and small in structure, and can achieve the real-time detection of the external leakage condition of the hydraulic cylinder and the qualification judgment.

Description

Technical Field

[0001] The invention relates to a real-time monitoring device and method for external leakage of a hydraulic cylinder based on visual detection, belonging to the technical field of hydraulic cylinder monitoring. Background Art

[0002] External leakage is a common indicator of hydraulic cylinders, and excessive external leakage is also a common fault of hydraulic cylinders. External leakage is mainly caused by the failure of the inner hole seal of the guide sleeve, and the hydraulic oil flows out from the inside of the hydraulic cylinder through the inner hole seal of the guide sleeve to the outside of the hydraulic cylinder. The main manifestation is heavy oil film on the surface of the piston rod and serious pollution at the dust ring of the guide sleeve, which causes the hydraulic cylinder to fail to work normally and causes environmental pollution.

[0003] The sealing of hydraulic cylinder is mainly achieved by the fit between the seal and the piston rod surface. There must be a certain oil film on the piston rod surface to ensure lubricity, so as to ensure the good use of the hydraulic cylinder seal. During use, due to damage to the inner hole seal of the guide sleeve, abnormal sealing groove and other reasons, the hydraulic oil flows out from the inside of the hydraulic cylinder through the inner hole seal of the guide sleeve to the outside of the hydraulic cylinder, resulting in a heavy oil film on the surface of the piston rod. The increase in the weight of the oil film is an accumulation process, and the timeliness of the abnormal state handling is delayed. At the same time, in large equipment and closed and narrow spaces, early or even serious external leakage cannot be effectively discovered, resulting in serious pollution at the dust ring of the guide sleeve, affecting the cleanliness of the inside of the hydraulic cylinder and even the entire hydraulic system, and ultimately causing the hydraulic cylinder to fail to work properly.

[0004] Currently, external leaks require human visual judgment, and there is a lag in the timeliness of handling abnormal conditions. At the same time, in large equipment and confined and narrow spaces, early or even serious external leaks cannot be effectively detected. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a real-time monitoring device and method for external leakage of a hydraulic cylinder based on visual detection, which has a simple and compact structure and can realize real-time external leakage detection of the hydraulic cylinder and qualification judgment.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions: On the one hand, the present invention provides a real-time monitoring device for external leakage of a hydraulic cylinder based on visual detection, wherein the hydraulic cylinder comprises a guide sleeve and a piston rod, wherein the guide sleeve is sleeved on the piston rod; A detection device mounting seat is provided on the side of the guide sleeve close to the piston rod, and a first dust ring and a second dust ring are respectively provided on the detection device mounting seat and the side of the guide sleeve close to the piston rod. A visual detector is provided on the detection device mounting seat, and the first dust ring, the detection device mounting seat, the visual detector, the second dust ring and the piston rod form a closed space. The visual detector is connected to the PLC system terminal by electrical signals, and the visual detector can detect leakage outside the closed space and transmit it to the PLC system terminal through electrical signals. The PLC system terminal is used to make a judgment on the leakage outside the closed space.

[0007] Furthermore, the visual inspection device is provided in plurality and is evenly distributed around the piston rod through the inspection device mounting seat.

[0008] Furthermore, the number of the visual detectors is two, which are respectively distributed on both sides of the piston rod through the detection device mounting base.

[0009] Furthermore, the detection device mounting seat and the guide sleeve are both provided with inner holes on a side close to the piston rod, and the first dustproof ring and the second dustproof ring are both clamped in the inner holes.

[0010] Furthermore, welding is adopted between the detection device mounting seat and the guide sleeve.

[0011] On the other hand, the present invention provides a monitoring method of a real-time monitoring device for external leakage of a hydraulic cylinder based on visual detection, comprising: During the reciprocating motion of the piston rod, the visual detector obtains the leakage information outside the closed space in real time and transmits the leakage information outside the closed space to the PLC system terminal; The PLC system terminal calculates the oil stain area based on the leakage information outside the closed space, and compares the oil stain size with the preset area threshold. If the oil stain area is smaller than the preset area threshold, the hydraulic cylinder external leakage is judged to be qualified; if the oil stain area is larger than the preset area threshold, the hydraulic cylinder external leakage is judged to be unqualified.

[0012] Furthermore, the leakage information outside the closed space includes the presence or absence of oil stains, the width of the oil stains, the circumferential length of the oil stains along the piston rod, and the diameter of the piston rod.

[0013] Furthermore, the preset area threshold is an oil trace area threshold corresponding to different piston rod diameters.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The monitoring device of the present invention has a simple and compact structure, is installed on the guide sleeve of the hydraulic cylinder, requires a small installation space, is easy and quick to install, and has good versatility; The detection method of the present invention realizes real-time hydraulic cylinder external leakage detection and qualification judgment by using a visual inspection instrument, visual inspection technology and a PLC system terminal, thus saving labor costs and improving work efficiency to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a real-time monitoring device for external leakage of a hydraulic cylinder based on visual detection in an embodiment of the present invention; In the figure: 1-guide sleeve, 2-piston rod, 3-detection device mounting seat, 4-visual detector, 5-first dustproof ring, 6-second dustproof ring, 7 closed space. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention. Example 1

[0017] like Figure 1 As shown, an embodiment of the present invention provides a real-time monitoring device for external leakage of a hydraulic cylinder based on visual detection. The hydraulic cylinder includes a guide sleeve 1 and a piston rod 2 , and the guide sleeve 1 is sleeved on the piston rod 2 .

[0018] The front end surface of the guide sleeve 1 is provided with a detection device mounting seat 3, and the detection device mounting seat 3 is sleeved on the piston rod 2. In this embodiment, the guide sleeve 1 and the detection device mounting seat 3 are connected by welding, but it is not limited to this. Other connection methods that can achieve a good fixed connection should also be possible. The detection device mounting seat 3 is used to install a visual detector 4. The number of visual detectors 4 can be multiple, and they are evenly distributed around the circumference of the piston rod 2 through the detection device mounting seat 3. In this embodiment, the number of visual detectors 4 is 2, which are respectively arranged on the upper and lower sides of the piston rod 2.

[0019] The front end surfaces of the detection device mounting seat 3 and the guide sleeve 1 are both provided with inner holes near the piston rod 2, and the first dustproof ring 5 and the second dustproof ring 6 are respectively placed in the inner holes, and the first dustproof ring 5 and the second dustproof ring 6 both play a certain dustproof sealing role. The first dustproof ring 5, the detection device mounting seat 3, the visual inspection instrument 4, the second dustproof ring 6 and the piston rod are surrounded to form a closed space 7.

[0020] The visual detector 4 is connected to the PLC system terminal by electrical signals. The visual detector 4 can use visual detection technology to detect the external leakage of the hydraulic cylinder in the closed space 7, and transmit the external leakage of the hydraulic cylinder in the closed space 7 to the PLC system terminal. The PLC system terminal has the function of setting and adjusting the specification parameters of the hydraulic cylinder, which is used to judge whether the external leakage of the hydraulic cylinder in the closed space is qualified. Example 2

[0021] Based on Example 1, this example provides a real-time monitoring method for external leakage of a hydraulic cylinder based on visual detection, comprising the following steps: First, the monitoring device is installed according to Example 1.

[0022] During the reciprocating motion of the piston rod 2 , the visual detector 4 obtains leakage information outside the closed space 7 in real time, and transmits the leakage information outside the closed space 7 to the PLC system terminal.

[0023] The PLC system terminal calculates the oil stain area based on the leakage information outside the closed space 7. The leakage information outside the closed space 7 includes whether there is an oil stain, the width of the oil stain, the circumferential length of the oil stain along the piston rod, etc. The oil stain area can be obtained by calculating the above information.

[0024] Finally, the oil stain area is compared with the preset area threshold. The preset area threshold is the external leakage judgment standard formulated according to different piston rod 2 diameters. When the oil stain area is smaller than the preset area threshold, the external leakage of the hydraulic cylinder is judged to be qualified; when the oil stain area is larger than the preset area threshold, the external leakage of the hydraulic cylinder is judged to be unqualified, and staff needs to be arranged for maintenance.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A real-time monitoring device for external leakage of hydraulic cylinder based on visual detection, characterized in that: The hydraulic cylinder comprises a guide sleeve and a piston rod, wherein the guide sleeve is sleeved on the piston rod; A detection device mounting seat is provided on the side of the guide sleeve close to the piston rod, and a first dust ring and a second dust ring are respectively provided on the detection device mounting seat and the side of the guide sleeve close to the piston rod. A visual detector is provided on the detection device mounting seat, and the first dust ring, the detection device mounting seat, the visual detector, the second dust ring and the piston rod form a closed space. The visual detector is connected to the PLC system terminal by electrical signals, and the visual detector can detect leakage outside the closed space and transmit it to the PLC system terminal through electrical signals. The PLC system terminal is used to make a judgment on the leakage outside the closed space.

2. The real-time monitoring device for external leakage of a hydraulic cylinder based on visual detection according to claim 1 is characterized in that: The visual inspection instruments are provided in plurality and are evenly distributed around the piston rod through the inspection device mounting seat.

3. The real-time monitoring device for external leakage of hydraulic cylinder based on visual detection according to claim 2 is characterized in that: The number of the visual inspection instruments is two, which are respectively distributed on both sides of the piston rod through the inspection device mounting base.

4. The real-time monitoring device for external leakage of hydraulic cylinder based on visual detection according to claim 1 is characterized in that: The detection device mounting seat and the guide sleeve are both provided with inner holes on one side close to the piston rod, and the first dustproof ring and the second dustproof ring are both clamped in the inner holes.

5. The real-time monitoring device for external leakage of hydraulic cylinder based on visual detection according to claim 1 is characterized in that: The detection device mounting seat and the guide sleeve are welded.

6. A monitoring method for a real-time monitoring device for external leakage of a hydraulic cylinder based on visual detection according to any one of claims 1 to 5, characterized in that: include: During the reciprocating motion of the piston rod, the visual detector obtains the leakage information outside the closed space in real time and transmits the leakage information outside the closed space to the PLC system terminal; The PLC system terminal calculates the oil stain area based on the leakage information outside the closed space, and compares the oil stain size with the preset area threshold. If the oil stain area is smaller than the preset area threshold, the hydraulic cylinder external leakage is judged to be qualified; if the oil stain area is larger than the preset area threshold, the hydraulic cylinder external leakage is judged to be unqualified.

7. The detection method of the real-time monitoring device for external leakage of a hydraulic cylinder based on visual detection according to claim 6 is characterized in that: The leakage information outside the closed space includes the presence or absence of oil stains, the width of the oil stains, the circumferential length of the oil stains along the piston rod, and the diameter of the piston rod.

8. The detection method of the real-time monitoring device for external leakage of a hydraulic cylinder based on visual detection according to claim 6 is characterized in that: The preset area threshold is the oil trace area threshold corresponding to different piston rod diameters.

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