Oil cylinder stroke measuring device

Abstract

The utility model belongs to the technical field of oil cylinder stroke measurement, and particularly relates to an oil cylinder stroke measuring device. Comprising a measuring rod with scales; the number of the oil cylinder inner hole fixing devices is two, and the two oil cylinder inner hole fixing devices are installed at the front end and the rear end of the oil cylinder body respectively. And the measuring rod with scales is arranged between the two oil cylinder hollow fixing devices and is parallel to the oil cylinder body. The device can quickly and conveniently measure the stroke of the oil cylinder, can measure the inner diameters of different oil cylinder bushing holes, and has the advantages of adjustability, wide application, simplicity in operation, convenience in installation and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil cylinder stroke measurement, in particular to an oil cylinder stroke measuring device. Background Art

[0002] Hydraulic cylinders are widely used in engineering machinery and are often used as power actuators. They have the characteristics of multiple varieties, multiple functions, high quality and high efficiency. However, during the use of engineering machinery, leakage of hydraulic cylinders is the main failure of the hydraulic system, which seriously affects the quality and working performance of engineering machinery products. Therefore, it is very important to check whether the hydraulic cylinders are leaking in time for the performance of engineering machinery.

[0003] When diagnosing and repairing oil cylinder leaks, indirectly judging whether the oil cylinder is leaking by measuring the oil cylinder stroke is a very important method. In the prior art, there are mainly two methods for measuring the oil cylinder stroke: 1. External measurement method. The external type of oil cylinder stroke is generally the most commonly used method at present, and a displacement sensor is usually used to measure the stroke of the oil cylinder. For example, a device for measuring the oil cylinder stroke by a pull-rope sensor and a ruler, the device places the pull-rope sensor and the ruler in the oil cylinder, and the pull rope and the ruler of the pull-rope sensor should be kept parallel to the direction of the oil cylinder stroke, so there is an error system. 2. Built-in measurement method, this measurement method is that the sensor part is installed inside the oil cylinder, filling the space outside the oil cylinder, generally using an ultrasonic displacement sensor or a Wiedemann effect sensor. The oil cylinder with this built-in sensor is called a stroke sensing oil cylinder. Summary of the Invention

[0004] The utility model provides a cylinder stroke measuring device for quickly and conveniently measuring the stroke of the cylinder and being able to measure the inner diameters of different cylinder bushing holes with adjustability.

[0005] The utility model adopts the following technical solution: a cylinder stroke measuring device, comprising:

[0006] a measuring rod with a scale;

[0007] Cylinder inner hole fixing device, there are two cylinder inner hole fixing devices, which are respectively installed at the front and rear ends of the cylinder body;

[0008] The measuring rod with scale is installed between the two oil cylinder inner hole fixing devices and is arranged parallel to the oil cylinder body.

[0009] In some embodiments, the cylinder inner hole fixing device includes:

[0010] A screw rod, wherein a measuring rod hole is provided at the upper end of the screw rod, and the measuring rod hole is used to allow a measuring rod with a scale to pass through;

[0011] Two fixing frames are provided, one of which is fixed to the lower end of the screw and the other is sleeved on the middle of the screw and can slide along the screw;

[0012] Multiple splints, each of which is hinged to a support plate at both ends, and the two ends of the support plate are respectively hinged to two fixing frames;

[0013] A nut is threadedly connected to the screw rod and is pressed on the upper side of the middle fixing frame.

[0014] In some embodiments, at least three connecting ears are provided on the fixing frame, and the connecting ears are used for hingedly connecting the splint.

[0015] In some embodiments, the number of the clamping plates is the same as the number of the connecting ears on each fixing frame.

[0016] In some embodiments, the splint is a long strip structure with a U-shaped cross-section, and circular holes I are provided at both ends of the splint for hinged connection with the support plates at both ends.

[0017] In some embodiments, the support plate is a rectangular plate-shaped structure, and circular holes II are provided at both ends of the support plate for hinged connection.

[0018] In some embodiments, a thread is provided at the middle and lower portion of the screw, and a disc is provided at the bottom of the screw for limiting the position of the nut.

[0019] In some embodiments, the oil cylinder inner hole fixing device is inserted into the inner holes of the bushings at the front and rear ends of the oil cylinder body, and the clamping plate is in contact with and connected to the inner wall of the inner hole of the bushing.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This utility model can quickly and conveniently measure the stroke of the oil cylinder and can measure the inner diameter of the oil cylinder bushing hole of different oil cylinders. It has the advantages of adjustability, wide applicability, simple operation, and easy installation. The measurement can be completed without modifying the structure of the oil cylinder, which greatly improves work efficiency. This utility model can effectively measure the variable diameter of oil cylinders with different cylinder diameters, and has many advantages such as simple operation and accurate measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the use of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the cylinder inner hole fixing device;

[0024] Figure 3 It is a three-dimensional diagram of the fixing device for the inner hole of the oil cylinder;

[0025] Figure 4 Schematic diagram of the support plate structure;

[0026] In the figure, 1- measuring rod with scale, 2- cylinder inner hole fixing device, 3- cylinder body, 2.1- fixing frame, 2.3- support plate, 2.4- clamping plate, 2.5- nut, 2.6- thread, 2.7- measuring rod hole, 2.8- screw. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments; based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, a cylinder stroke measuring device includes:

[0029] 1. a measuring rod with a scale;

[0030] Cylinder inner hole fixing device 2, there are two cylinder inner hole fixing devices 2, which are respectively installed at the front and rear ends of the cylinder body 3;

[0031] The measuring rod 1 with a scale is installed between two oil cylinder inner hole fixing devices 2 and is arranged parallel to the oil cylinder body 3.

[0032] During use, the cylinder bore fixtures 2 are inserted into the circular holes on the front and rear ends of the cylinder body 3. The distance between the two cylinder bore fixtures 2 can be measured using a graduated measuring rod 1. First, retract the cylinder and measure once, then extend the cylinder and measure again. The difference between the two measurements is the cylinder stroke.

[0033] like Figure 2 、 3 As shown, the oil cylinder inner hole fixing device 2 includes:

[0034] A screw rod 2.8, wherein a measuring rod hole 2.7 is provided at the upper end of the screw rod 2.8, and the measuring rod hole 2.7 is used to allow the measuring rod 2.1 with a scale to pass through;

[0035] Two fixing brackets 2.1 are provided, one of which is fixed to the lower end of the screw rod 2.8, and the other is sleeved on the middle of the screw rod 2.8 and can slide along the screw rod 2.8;

[0036] Multiple clamping plates 2.4, each of which is hinged to a support plate 2.3 at both ends, and each of which is hinged to two fixing frames 2.1 at both ends;

[0037] The nut 2.5 is threadedly connected to the screw rod 2.8, and the nut 2.5 is pressed on the upper side of the middle fixing frame 2.1.

[0038] A thread 2.6 is provided at the middle and lower portion of the screw rod 2.8, and a disc is provided at the bottom of the screw rod 2.8 for limiting the position of the nut 2.5.

[0039] When the oil cylinder inner hole fixing device 2 is in use, the nut 2.5 is first moved to a higher position on the screw rod 2.8. At this time, the fixing frame 2.1 sleeved on the middle part of the screw rod 2.8 slides to the uppermost end, and the clamping plate 2.4 on the side of the oil cylinder inner hole fixing device 2 is at the position closest to the screw rod 2.8. The oil cylinder inner hole fixing device 2 can be smoothly inserted into the inner hole of the bushing with different inner diameters of the oil cylinder body 3.

[0040] After the cylinder bore fixture 2 is inserted, the nut 2.5 is rotated downward, and the clamping plate 2.4 is moved outward by the nut 2.5 until it fits against the surface of the circular hole. At this point, the cylinder bore fixture 2 is fully installed in the bushing inner hole of the cylinder body 3, and measurement work can be carried out.

[0041] The fixing frame 2.1 is provided with at least three connecting ears, which are used to hinge and connect the clamping plates 2.4. The number of the clamping plates 2.4 is the same as the number of the connecting ears on each fixing frame 1.

[0042] The oil cylinder inner hole fixing device 2 is inserted into the inner holes of the oil cylinder bushings at the front and rear ends of the oil cylinder body 3, and the clamping plates 2.4 are in contact with and connected to the inner wall of the inner hole of the oil cylinder bushings.

[0043] Specifically, the fixing frame 2.1 is a circular ring structure with an inner diameter equal to the outer diameter of the screw rod 2.8, and can be just sleeved on the screw rod 2.8 and slide along the screw rod 2.8.

[0044] Clamping plate 2.4 is a long, U-shaped structure with circular holes I at each end, allowing it to be hingedly connected to supporting plates 2.3. Clamping plate 2.4 is the only component of the device that contacts the inner bore of the cylinder liner. Its overall arc-shaped design allows it to contact the inner bore of the cylinder liner by tightening the nut and applying downward pressure to the compression spring.

[0045] like Figure 4 As shown, the support plate 2.3 is a rectangular plate structure, and circular holes II are set at both ends of the support plate 2.3 for hinge connection. The support plate serves as the motion unit of the device and plays a key role in adjusting the measured outer diameter.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cylinder stroke measuring device, characterized in that: include: a graduated measuring rod (1); An oil cylinder inner hole fixing device (2), wherein two oil cylinder inner hole fixing devices (2) are provided and are respectively installed at the front and rear ends of the oil cylinder body (3); The graduated measuring rod (1) is installed between two oil cylinder inner hole fixing devices (2) and is arranged parallel to the oil cylinder body (3).

2. The oil cylinder stroke measuring device according to claim 1, characterized in that: The oil cylinder inner hole fixing device (2) comprises: A screw rod (2.8), wherein a measuring rod hole (2.7) is provided at the upper end of the screw rod (2.8), and the measuring rod hole (2.7) is used to allow a measuring rod (1) with a scale to pass through; A fixing frame (2.1), wherein two fixing frames (2.1) are provided, one of which is fixed to the lower end of the screw rod (2.8), and the other is sleeved on the middle of the screw rod (2.8) and can slide along the screw rod; A plurality of splints (2.4), each of the splints (2.4) being hingedly connected to a support plate (2.3), and each of the two ends of the support plate (2.3) being hingedly connected to two fixing frames (2.1); A nut (2.5) is threadedly connected to the screw rod (2.8), and the nut (2.5) is pressed against the upper side of the middle fixing frame (2.1).

3. The oil cylinder stroke measuring device according to claim 2, characterized in that: At least three connecting ears are provided on the fixing frame (2.1), and the connecting ears are used for hingedly connecting the splint (2.4).

4. The oil cylinder stroke measuring device according to claim 3, characterized in that: The number of the clamping plates (2.4) is the same as the number of the connecting ears on each fixing frame (2.1).

5. The oil cylinder stroke measuring device according to claim 2, characterized in that: The splint (2.4) is a long strip structure with a U-shaped cross-section. Circular holes I are provided at both ends of the splint (2.4) for hinged connection with the support plates (2.3) at both ends.

6. The oil cylinder stroke measuring device according to claim 5, characterized in that: The support plate (2.3) is a rectangular plate-shaped structure, and circular holes II are provided at both ends of the support plate (2.3) for hinged connection.

7. The oil cylinder stroke measuring device according to claim 2, characterized in that: A thread (2.6) is provided at the middle and lower portion of the screw rod (2.8), and a disc is provided at the bottom of the screw rod (2.8) for limiting the position of the nut (2.5).

8. The oil cylinder stroke measuring device according to claim 2, characterized in that: The oil cylinder inner hole fixing device (2) is inserted into the bushing inner holes at the front and rear ends of the oil cylinder body (3), and the clamping plate (2.4) is in contact with and connected to the inner wall of the bushing inner hole.

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