Hydraulic cylinder for electro-hydraulic integrated push rod

Abstract

The hydraulic cylinder for the electro-hydraulic integrated push rod comprises a cylinder barrel assembly and a programmable logic controller (PLC), and a piston rod is arranged in the cylinder barrel assembly in a sliding mode. The cylinder barrel assembly comprises a cylinder barrel body, a cylinder barrel inner cavity is formed in the center of the cylinder barrel body, and the cylinder barrel inner cavity and the piston rod are assembled in a sliding mode. A long oil pipe and a short oil pipe which are arranged in the axial direction of the cylinder barrel body are arranged in the outer side wall of the cylinder barrel body. A protective cover is arranged on the peripheral side of the piston rod extending out of the cylinder barrel body and is of a corrugated retractable structure. The corrugated retractable protective cover is arranged between the piston rod and the end of the cylinder barrel body to protect the piston rod, the protective cover can change correspondingly in the moving process of the piston rod, dust impurities in outside air are intercepted, and the situation that the dust impurities are brought into the cylinder barrel to pollute hydraulic oil in the moving process of the piston rod is avoided; the problem that dust impurities easily enter the cylinder barrel to cause pollution due to the fact that the piston rod is exposed in the external environment is solved.

Description

Technical Field

[0001] This utility model relates to the field of electro-hydraulic actuator technology, specifically to a hydraulic cylinder for an electro-hydraulic integrated actuator. Background Technology

[0002] Electro-hydraulic actuators are hydraulically driven manipulators that integrate mechanics, electricity, and hydraulics. They are suitable for reciprocating push-pull and linear / rotational movements at a certain angle. They are universal drives, similar to servo motors and cylinders, and are widely used in metallurgy, mining, power, coal, machinery, transportation, grain, chemical, cement, water conservancy, building materials, and transportation industries.

[0003] Existing electro-hydraulic actuator cylinders often operate in dusty environments. The piston rod inside the cylinder lacks protective components, leaving it directly exposed to the external environment during operation. This makes it extremely easy for airborne dust to enter the hydraulic oil inside the cylinder, contaminating the oil and causing the cylinder to malfunction. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a hydraulic cylinder for an electro-hydraulic integrated push rod, which can protect the piston rod and solve the problem that dust and impurities can easily enter the cylinder and cause pollution when the piston rod is exposed to the external environment, thus avoiding the contamination of hydraulic oil by dust and impurities brought into the cylinder during the movement of the piston rod.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0006] A hydraulic cylinder for an electro-hydraulic integrated actuator includes a cylinder assembly and a PLC controller. A piston rod is slidably disposed within the cylinder assembly. The cylinder assembly includes a cylinder body with a cylinder cavity at its center, and the cylinder cavity is slidably fitted with the piston rod. A long oil pipe and a short oil pipe are respectively provided on the inner side wall of the outer side of the cylinder body, arranged axially along the cylinder body. The outlet of the long oil pipe communicates with the cylinder cavity located in front of the piston block at the right end of the piston rod, and the outlet of the short oil pipe communicates with the cylinder cavity located behind the piston block at the right end of the piston rod. A protective cover is provided around the piston rod extending from the cylinder body. One end of the protective cover is fixedly disposed on the side wall of the piston rod, and the other end is fitted onto the front part of the cylinder body. The protective cover has a corrugated retractable structure.

[0007] The aforementioned electro-hydraulic integrated actuator hydraulic cylinder has a magnetic ring installed at the piston rod end located at the rear end of the cylinder assembly. A displacement sensor is installed inside the cylinder assembly, and the output end of the displacement sensor is connected to the input end of the PLC controller.

[0008] The displacement sensor in the aforementioned electro-hydraulic integrated push rod hydraulic cylinder is one of the following: a Hall effect sensor, a magnetostrictive sensor, a magnetic grating ruler, or an inductive proximity sensor.

[0009] The aforementioned electro-hydraulic integrated actuator hydraulic cylinder has a cylinder head sealing member at the front end of the cylinder inner cavity and a cylinder tail sealing member at the rear end of the cylinder inner cavity, with the piston rod passing through the cylinder head sealing member.

[0010] The aforementioned electro-hydraulic integrated actuator hydraulic cylinder has an anti-rotation rod mounting seat on the outer wall of the cylinder body, a connecting plate at the front end of the piston rod, an anti-rotation rod on the end face of the connecting plate near the piston rod, and the other end of the anti-rotation rod slidingly fitted with the anti-rotation rod mounting seat.

[0011] The aforementioned electro-hydraulic integrated push rod hydraulic cylinder has cylinder exhaust seats that communicate with the cylinder cavity installed on the cylinder body side wall located on the front side of the right end of the piston rod and the cylinder body side wall located on the rear side of the right end of the piston rod, respectively.

[0012] The aforementioned electro-hydraulic integrated actuator hydraulic cylinder has two legs at the bottom of the cylinder body for supporting the cylinder body.

[0013] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0014] This utility model provides a hydraulic cylinder for an electro-hydraulic integrated push rod. By setting a corrugated retractable protective cover between the piston rod and the end of the cylinder body, the piston rod is protected. The protective cover will also change accordingly during the movement of the piston rod, intercepting dust and impurities in the outside air and preventing dust and impurities from being brought into the cylinder and contaminating the hydraulic oil during the movement of the piston rod. This solves the problem that dust and impurities can easily enter the cylinder and cause pollution when the piston rod is exposed to the external environment.

[0015] This invention installs a magnetic ring at the end of the piston rod and senses the magnetic field changes of the magnetic ring inside the cylinder, converting the magnetic field change signal into a displacement electrical signal to achieve precise control of the hydraulic cylinder. At the same time, an anti-rotation rod is installed between the cylinder body and the piston rod to guide the movement of the piston rod. The anti-rotation rod can move axially along the cylinder body, guiding and limiting the movement of the piston rod without affecting its movement, thus preventing deviation during piston rod movement and affecting the accuracy of the hydraulic cylinder's operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the specific structure of the present utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0018] Figure 3 This is a top view of the present invention;

[0019] Figure 4 This is a schematic diagram showing the specific structure of the internal piping distribution of the cylinder assembly described in this utility model;

[0020] Figure 5 This is another sectional view of the cylinder assembly described in this utility model.

[0021] Among them: 110. Cylinder assembly, 1100. Cylinder body, 1101. Support leg, 1102. Cylinder cavity, 1103. Anti-rotation rod mounting seat, 1104. Long oil pipe, 1105. Short oil pipe, 1106. Cylinder exhaust seat, 120. Piston rod, 130. Connecting plate, 140. Anti-rotation rod, 150. Protective cover, 160. Cylinder head sealing component, 170. Cylinder tail sealing component, 180. Magnetic ring, 190. Displacement sensor. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] A hydraulic cylinder for an electro-hydraulic integrated actuator, such as Figures 1 to 5 As shown, it includes a cylinder assembly 110 and a PLC controller, and a piston rod 120 is slidably disposed inside the cylinder assembly 110.

[0024] A magnetic ring 180 is installed at the end of the piston rod 120 located at the rear end inside the cylinder assembly. A displacement sensor 190 is installed inside the cylinder assembly 110. The actual displacement of the piston rod 120 is detected by the cooperation of the magnetic ring 180 and the displacement sensor 190.

[0025] The output terminal of the displacement sensor 190 is connected to the input terminal of the PLC controller. The displacement sensor 190 is one of the following: Hall effect sensor, magnetostrictive sensor, magnetic scale, and inductive proximity sensor. The displacement sensor 190 mainly senses the change in the magnetic field strength of the magnetic ring 180 when the magnetic ring 180 moves with the piston rod 120, and then converts the magnetic field change signal into a displacement electrical signal for output.

[0026] For example, when the displacement sensor 190 is a magnetostrictive sensor, the movement of the magnetic ring 180 will cause magnetic field disturbance. The waveguide wire in the sensor will generate a magnetostrictive effect, converting the magnetic field change into a mechanical stress wave. By measuring the propagation time difference of the stress wave, an electrical signal (such as pulse width or voltage) proportional to the displacement will be output, and the corresponding displacement can be obtained.

[0027] The cylinder assembly 110 includes a cylinder body 1100, and a cylinder inner cavity 1102 that is completely through the center of the cylinder body 1100. The cylinder inner cavity 1102 is slidably fitted with the piston rod 120.

[0028] The bottom of the cylinder body 1100 is provided with support feet 1101, which are used to support the cylinder body 1100. There are two support feet 1101.

[0029] A cylinder head sealing member 160 is provided at the front end of the cylinder inner cavity 1102. At this time, the front end of the cylinder inner cavity is the extended end of the piston rod 120. The piston rod 120 passes through the cylinder head sealing member 160. A cylinder tail sealing member 170 is provided at the rear end of the cylinder inner cavity 1102 to ensure the sealing of the cylinder inner cavity.

[0030] An anti-rotation rod mounting seat 1103 is provided on the outer wall of the cylinder body 1100. A connecting plate 130 is provided at the front end of the piston rod 120. An anti-rotation rod 140 is provided on the end face of the connecting plate 130 near the piston rod 120. The other end of the anti-rotation rod 140 is slidably fitted with the anti-rotation rod mounting seat 1103, so as to move together with the piston rod and guide the movement of the piston rod, while preventing the piston rod from deviating and rotating.

[0031] The inner side wall of the cylinder body 1100 is provided with a long oil pipe 1104 and a short oil pipe 1105 arranged along the circumference of the cylinder body, and the long oil pipe 1104 and the short oil pipe 1105 are arranged opposite to each other.

[0032] The oil outlet of the long oil pipe 1104 is connected to the cylinder cavity 1102 located in front of the piston block at the right end of the piston rod 120, and is used to deliver oil to the cylinder cavity 1102 in front of the piston block at the right end of the piston rod 120, thereby pushing the piston rod 120 to retract backward.

[0033] The oil outlet of the short oil pipe 1105 is connected to the cylinder cavity 1102 located behind the piston block at the right end of the piston rod 120, and is used to supply oil to the cylinder cavity 1102 behind the piston block at the right end of the piston rod 120, thereby pushing the piston rod 120 to extend forward.

[0034] A cylinder exhaust seat 1106 communicating with the cylinder cavity 1102 is installed on the side wall of the cylinder body 1100 located in front of the piston block at the right end of the piston rod 120 and on the side wall of the cylinder body 1100 located behind the piston block at the right end of the piston rod 120, respectively.

[0035] A protective cover 150 is provided around the piston rod 120 that extends out of the cylinder body 1100. One end of the protective cover 150 is fixedly installed on the side wall of the piston rod 120, and the other end is fitted onto the front of the cylinder body 1100.

[0036] The protective cover 150 has a corrugated retractable structure that can change with the movement of the piston rod 120 to prevent dust and impurities from entering the cylinder cavity during the movement of the piston rod, causing oil contamination inside the cylinder cavity and leading to malfunction of the hydraulic cylinder.

[0037] When the piston rod retracts, hydraulic fluid enters the cylinder cavity in front of the piston block on the right end of the piston rod through the long oil pipe, pushing the piston rod to the right. At the same time, the hydraulic oil in the cylinder cavity behind the piston block on the right end of the piston rod will be discharged through the short oil pipe. Simultaneously, the cylinder exhaust seat corresponding to the cylinder cavity behind the piston block on the right end of the piston rod will exhaust air to prevent excessive pressure in the cylinder cavity.

[0038] Conversely, when the piston rod extends, the oil enters the cylinder cavity behind the piston block at the right end of the piston rod through the short oil pipe, pushing the piston rod to the left. At this time, the hydraulic oil in the cylinder cavity in front of the piston block at the right end of the piston rod will be discharged through the long oil pipe, and the cylinder exhaust seat corresponding to the cylinder cavity in front of the piston block at the right end of the piston rod will exhaust the oil.

[0039] During the movement of the piston rod, the magnetic ring generates a change in magnetic field as the piston rod moves. The displacement sensor senses the change in magnetic field and converts the corresponding magnetic field change signal into an electrical signal output, thereby achieving precise control of the piston rod displacement.

[0040] This utility model provides a hydraulic cylinder for an electro-hydraulic integrated push rod. By setting a corrugated retractable protective cover between the piston rod and the end of the cylinder body, the piston rod is protected. The protective cover will also change accordingly during the movement of the piston rod, intercepting dust and impurities in the outside air and preventing dust and impurities from being brought into the cylinder and contaminating the hydraulic oil during the movement of the piston rod. This solves the problem that dust and impurities can easily enter the cylinder and cause pollution when the piston rod is exposed to the external environment.

[0041] This invention installs a magnetic ring at the end of the piston rod and senses the magnetic field changes of the magnetic ring inside the cylinder, converting the magnetic field change signal into a displacement electrical signal to achieve precise control of the hydraulic cylinder. At the same time, an anti-rotation rod is installed between the cylinder body and the piston rod to guide the movement of the piston rod. The anti-rotation rod can move axially along the cylinder body, guiding and limiting the movement of the piston rod without affecting its movement, thus preventing deviation during piston rod movement and affecting the accuracy of the hydraulic cylinder's operation.

Claims

1. A hydraulic cylinder for an electro-hydraulic integrated actuator, characterized in that: The system includes a cylinder assembly (110) and a PLC controller. A piston rod (120) is slidably disposed within the cylinder assembly (110). The cylinder assembly (110) includes a cylinder body (1100), with a cylinder cavity (1102) centrally located. The cylinder cavity (1102) and the piston rod (120) are slidably fitted together. A long oil pipe (1104) and a short oil pipe (1105) are respectively provided on the inner side wall of the cylinder body (1100) along the axial direction of the cylinder body. The long oil pipe (1104) has... The oil outlet is connected to the cylinder cavity (1102) located in front of the piston block at the right end of the piston rod (120), and the oil outlet of the short oil pipe (1105) is connected to the cylinder cavity (1102) located behind the piston block at the right end of the piston rod (120); a protective cover (150) is provided around the piston rod (120) extending out of the cylinder body (1100), one end of the protective cover (150) is fixedly installed on the side wall of the piston rod (120), and the other end is fitted on the front of the cylinder body (1100); the protective cover (150) is a corrugated retractable structure.

2. The hydraulic cylinder for an electro-hydraulic integrated actuator according to claim 1, characterized in that: A magnetic ring (180) is installed at the end of the piston rod (120) located at the rear end of the cylinder assembly. A displacement sensor (190) is installed inside the cylinder assembly (110). The output end of the displacement sensor (190) is connected to the input end of the PLC controller.

3. The hydraulic cylinder for an electro-hydraulic integrated actuator according to claim 2, characterized in that: The displacement sensor (190) is one of the following: Hall effect sensor, magnetostrictive sensor, magnetic grating ruler, and inductive proximity sensor.

4. The hydraulic cylinder for an electro-hydraulic integrated actuator according to claim 1, characterized in that: The cylinder head sealing member (160) is provided at the front end of the cylinder inner cavity (1102), and the cylinder tail sealing member (170) is provided at the rear end of the cylinder inner cavity (1102). The piston rod (120) passes through the cylinder head sealing member (160).

5. A hydraulic cylinder for an electro-hydraulic integrated actuator according to claim 1, characterized in that: The outer wall of the cylinder body (1100) is provided with an anti-rotation rod mounting seat (1103), the front end of the piston rod (120) is provided with a connecting plate (130), and an anti-rotation rod (140) is provided on the end face of the connecting plate (130) near the piston rod (120). The other end of the anti-rotation rod (140) is slidably fitted with the anti-rotation rod mounting seat (1103).

6. A hydraulic cylinder for an electro-hydraulic integrated actuator according to claim 1, characterized in that: A cylinder exhaust seat (1106) communicating with the cylinder cavity (1102) is installed on the side wall of the cylinder body (1100) located on the front side of the right end of the piston rod (120) and the side wall of the cylinder body (1100) located on the rear side of the right end of the piston rod (120).

7. A hydraulic cylinder for an electro-hydraulic integrated actuator according to claim 1, characterized in that: The bottom of the cylinder body (1100) is provided with two support legs (1101) for supporting the cylinder body (1100).

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