Hydraulic cylinder with displacement sensor

Abstract

The utility model provides a hydraulic cylinder with displacement sensor, include: the cylinder barrel with open end, the open end of cylinder barrel installs the guide bushing, be provided with the magnetic ring on the guide bushing, piston rod assembly, piston rod assembly is inserted in the cylinder and the magnetic ring inside activity, just the oil pipe is provided with in piston rod assembly, piston rod assembly installs displacement sensor, displacement sensor is located the outside of cylinder, piston rod assembly can retractable motion in the cylinder, displacement sensor detects the telescopic motion stroke of piston, displacement sensor is designed as external type, only need to remove the rod head when maintaining can take off displacement sensor, and dismounting is very convenient, has shortened the time of maintenance, has reduced the downtime significantly.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a hydraulic cylinder with a displacement sensor. Background Technology

[0002] In existing magnetostrictive displacement sensors for hydraulic cylinders, the magnetic ring is typically installed at the bottom of the piston rod inside the hydraulic cylinder, while the sensor body is installed inside the cylinder (built-in). In this traditional layout, the magnetic ring is located inside the cylinder. Although this enables non-contact measurement, it has problems such as difficult maintenance (requiring cylinder disassembly), high cost, and complex installation.

[0003] Therefore, it is necessary to provide a hydraulic cylinder with a displacement sensor to solve the above problems. Utility Model Content

[0004] This utility model provides a hydraulic cylinder with a displacement sensor. The displacement sensor is designed to be external, so during maintenance, the displacement sensor can be removed simply by removing the upper part of the piston rod. This makes disassembly and assembly very convenient, shortens maintenance time, and significantly reduces downtime.

[0005] To achieve the above objectives, the technical solution proposed in this utility model is as follows: a hydraulic cylinder with a displacement sensor, comprising:

[0006] A cylinder with an open end, wherein a guide sleeve is installed at the open end of the cylinder and a magnetic ring is provided on the guide sleeve;

[0007] A piston rod is movably mounted inside a cylinder and a magnetic ring. An oil pipe is provided inside the piston rod, and a displacement sensor mandrel is installed inside the oil pipe. The displacement sensor is located outside the cylinder. The piston rod can extend and retract within the cylinder, and the displacement sensor detects the extension and retraction stroke of the piston.

[0008] Preferably, the piston assembly includes a rod head and a piston rod, the rod head is mounted on one end of the piston rod, the oil pipe is installed in the inner hole of the piston rod, and the oil pipe extends to the bottom of the cylinder.

[0009] Preferably, the other end of the piston rod is provided with a rod head, which is located outside the cylinder. The rod head is provided with an oil inlet and an oil outlet that are connected to the oil pipe.

[0010] Preferably, the displacement sensor is mounted on the rod head.

[0011] Preferably, the oil inlet and oil outlet are distributed adjacent to each other.

[0012] Preferably, the rod head is equipped with a socket for electrical connection with the displacement sensor.

[0013] Preferably, a pressure cap is also installed on the guide sleeve, the pressure cap is located above the magnetic ring and wraps around the magnetic ring, and the piston rod passes through the guide sleeve, the magnetic ring and the pressure cap.

[0014] Compared with the existing technology, the beneficial effects are: 1) Installing the guide sleeve at the open end of the cylinder can guide the piston rod, enabling the piston rod to move stably within the cylinder, and can also seal the open end of the cylinder.

[0015] 2) By mounting the magnetic ring on the guide sleeve, the magnetic ring can be prevented from being contaminated by oil, which would affect its performance and thus the measurement accuracy of the displacement sensor.

[0016] 3) By mounting the displacement sensor on the pole head, the displacement sensor is designed as an external device. During maintenance, the displacement sensor can be removed simply by removing the pole head. This makes disassembly and assembly very convenient, shortens maintenance time, and significantly reduces downtime.

[0017] Other features and advantages of this invention will be set forth in the following description, and in part will be apparent from the description, or may be learned by practice of the invention. The features and advantages of this invention may be realized and obtained by means of the elements and combinations specifically pointed out in the appended claims. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A cross-sectional view of the hydraulic cylinder with a displacement sensor provided by this utility model;

[0020] Figure 2 A cross-sectional view of a hydraulic cylinder with a displacement sensor provided by this utility model.

[0021] Reference numerals in the attached diagram: 1. Cylinder; 2. Guide sleeve; 3. Magnetic ring; 4. Pressure cap; 5. Piston; 6. Piston rod; 7. Rod head; 8. Displacement sensor; 9. Sensor socket; 10. Oil pipe; 11. Oil inlet; 12. Oil outlet. Detailed Implementation

[0022] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are merely for explaining the present utility model and are not intended to limit the present utility model.

[0023] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0025] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0026] Please see Figures 1 to 2 This utility model provides a hydraulic cylinder with a displacement sensor, comprising:

[0027] A cylinder 1 with an open end, wherein a guide sleeve 2 is installed at the open end of the cylinder 1, and a magnetic ring 3 is provided on the guide sleeve 2;

[0028] The piston rod 6 is movably inserted into the cylinder 1 and the magnetic ring 3, and an oil pipe 10 is provided inside the piston rod 6. A displacement sensor 8 is installed on the piston rod head 7. The displacement sensor 8 is located outside the cylinder 1. The piston rod 6 can extend and retract within the cylinder 1. The displacement sensor 8 detects the extension and retraction stroke of the piston rod 6.

[0029] Thus, when hydraulic oil is injected into the oil pipe 10, the hydraulic oil in the oil pipe 10 flows to the bottom of the cylinder 1 and generates pressure, causing the piston rod 6 to extend out of the cylinder 1. The magnetic ring 3 converts the measured physical displacement of the piston rod 6 into an electrical signal that can be recognized by the displacement sensor 8. The displacement sensor 8 on the piston rod 6 detects the extension distance of the piston rod 6.

[0030] When hydraulic oil is drawn out through oil pipe 10, the hydraulic oil inside cylinder 1 is drawn to the outside of cylinder 1 through oil pipe 10, generating suction that causes piston rod 6 to retract into cylinder 1. The magnetic ring 3 converts the measured physical displacement of piston rod 6 into an electrical signal recognizable by displacement sensor 8. Displacement sensor 8 on piston rod 6 detects the retraction distance of piston rod 6. In this way, the extension and retraction stroke of piston rod 6 can be measured.

[0031] Since the guide sleeve 2 is installed at the open end of the cylinder 1, it can guide the piston rod 6, allowing the piston rod 6 to move stably within the cylinder 1. It can also seal the open end of the cylinder 1. By installing the magnetic ring 3 on the guide sleeve 2, the advantage of this design is that it can prevent the magnetic ring 3 from being contaminated by oil, which would affect the performance of the magnetic ring 3 and thus affect the measurement accuracy of the displacement sensor 8.

[0032] Furthermore, by mounting the displacement sensor 8 on the piston rod 6, the displacement sensor 8 is designed as an external component (located outside the cylinder 1). During maintenance, the displacement sensor 8 can be removed simply by removing the rod head 7, which is very convenient for disassembly and assembly, shortens maintenance time, and significantly reduces downtime.

[0033] In one specific embodiment, the piston 6 includes a rod head 7 and an oil pipe 10. The rod head 7 is mounted on one end of the piston rod 6, and the oil pipe 10 is installed in the inner hole of the piston rod 6, extending to the bottom of the cylinder 1. By placing the oil pipe 10 inside the piston rod 6, it is unnecessary to design a dedicated hydraulic oil passage. Hydraulic oil is supplied to the inside of the cylinder 1 through the oil pipe 10, which generates pressure inside the cylinder 1 to cause the piston rod 6 to extend and retract within the cylinder 1.

[0034] In one specific embodiment, a rod head 7 is provided at the other end of the piston rod 6. The rod head 7 is located outside the cylinder 1, and the rod head 7 is provided with an oil inlet 11 and an oil outlet 12 that communicate with the oil pipe 10. An external hydraulic system (mainly composed of a hydraulic pump, an oil tank, and external oil pipe 10, etc.) is connected to the oil inlet 11 and the oil outlet 12. Hydraulic oil can be injected into the oil pipe 10 through the oil inlet 11, and hydraulic oil can be drawn out from the oil pipe 10 and the cylinder 1 through the oil outlet 12.

[0035] In one specific embodiment, the displacement sensor 8 is mounted on the rod head 7, which ensures that the displacement sensor 8 is always outside the cylinder 1. By designing the displacement sensor 8 as an external component (the displacement sensor 8 is located outside the cylinder 1), the displacement sensor 8 can be removed simply by removing the rod head 7 during maintenance. This makes disassembly and assembly very convenient, shortens maintenance time, and reduces downtime.

[0036] In one specific embodiment, the oil inlet 11 and the oil outlet 12 are distributed adjacently to facilitate connection with the external oil pipe 10 of the hydraulic system.

[0037] In one specific embodiment, the rod head 7 is provided with a socket 9 that is electrically connected to the displacement sensor 8. The socket 9 is used to connect to the plug of the external signal line and the working power line, so as to provide voltage to the displacement sensor 8 and facilitate the signal transmission of the displacement sensor 8.

[0038] In one specific embodiment, a pressure cap 4 is also installed on the guide sleeve 2. The pressure cap 4 is located above the magnetic ring 3 and wraps around the magnetic ring 3. The piston rod 6 passes through the guide sleeve 2, the magnetic ring 3, and the pressure cap 4. With this design, the pressure cap 4 can wrap around the magnetic ring 3 to securely install the magnetic ring 3 on the guide sleeve 2 and prevent the magnetic ring 3 from loosening. The pressure cap 4 can also further seal the open end of the cylinder 1 to prevent external dust from entering the cylinder 1.

[0039] In use, the external oil pipe 10 of the hydraulic system is connected to the oil inlet 11 and the oil outlet 12. When hydraulic oil is injected into the oil pipe 10, the hydraulic oil in the oil pipe 10 flows to the bottom of the cylinder 1 and generates pressure to make the piston rod 6 extend out of the cylinder 1. The magnetic ring 3 converts the measured physical displacement of the piston rod 6 into an electrical signal that can be recognized by the displacement sensor 8. The displacement sensor 8 on the piston rod 6 detects the extension distance of the piston rod 6.

[0040] When the hydraulic pump of the hydraulic system draws hydraulic oil through the oil pipe 10, the hydraulic oil in the cylinder 1 is drawn to the outside of the cylinder 1 through the oil flow pipe 10, generating suction that causes the piston rod head 6 to retract into the cylinder 1. The magnetic ring 3 converts the measured physical displacement of the piston rod head 6 into an electrical signal that can be recognized by the displacement sensor 8. The displacement sensor 8 on the piston rod 6 detects the retraction distance of the piston rod 6. In this way, the extension and retraction stroke of the piston rod 6 can be measured.

[0041] This invention is not limited to the description in the specification and embodiments. Therefore, other advantages and modifications can be readily realized by those skilled in the art. Thus, without departing from the spirit and scope of the general concept as defined by the claims and their equivalents, this invention is not limited to the specific details, representative devices and illustrated examples shown and described herein.

Claims

1. A hydraulic cylinder with a displacement sensor, characterized in that, include: A cylinder (1) with an open end, a guide sleeve (2) is installed at the open end of the cylinder (1), and a magnetic ring (3) is provided on the guide sleeve (2). A piston rod (6) is movably inserted into the cylinder (1) and the magnetic ring (3), and an oil pipe (10) is provided inside the piston rod (6). A displacement sensor (8) is installed on the piston rod (6), and the displacement sensor (8) is located outside the cylinder (1). The piston rod (6) can extend and retract within the cylinder (1), and the displacement sensor (8) detects the extension and retraction stroke of the piston rod (6).

2. The hydraulic cylinder with displacement sensor as described in claim 1, characterized in that, The piston rod (6) includes a rod head (7) and an oil pipe (10). The rod head (7) is mounted on one end of the piston rod (6), and the oil pipe (10) is installed inside the central axis of the piston rod (6) and extends to the bottom of the cylinder (1).

3. The hydraulic cylinder with displacement sensor as described in claim 2, characterized in that, The piston rod (6) has a rod head (7) at the other end. The rod head (7) is located outside the cylinder (1). The rod head (7) has an oil inlet (11) and an oil outlet (12) that are connected to the oil pipe (10).

4. The hydraulic cylinder with displacement sensor as described in claim 3, characterized in that, The displacement sensor (8) is mounted on the rod head (7).

5. The hydraulic cylinder with displacement sensor as described in claim 3, characterized in that, The oil inlet (11) and oil outlet (12) are located adjacent to each other.

6. The hydraulic cylinder with displacement sensor as described in claim 3, characterized in that, The rod head (7) is provided with a socket (9) that is electrically connected to the displacement sensor (8).

7. The hydraulic cylinder with displacement sensor as described in claim 3, characterized in that, The guide sleeve (2) is also equipped with a pressure cap (4), which is located above the magnetic ring (3) and wraps around the magnetic ring (3). The piston rod (6) passes through the guide sleeve (2), the magnetic ring (3) and the pressure cap (4).

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