CN2699035Y - Displacement sensor built-in hydraulic cylinder with single rod and double approximately equal action area - Google Patents

Abstract

The utility model discloses a hydraulic cylinder with approximately equal double action areas of a single output rod with a built-in displacement sensor. The bottom of the cylinder is fixedly connected with the inner piston rod, and the piston and the piston rod are fixedly installed between the cylinder barrel and the inner piston rod. , the piston rod and the inner piston rod and the displacement sensor are installed in the inner piston, the main body is fixed on the shoulder of the piston rod, the displacement sensor sliding sleeve is fixed on the inner top of the inner piston rod, the displacement sensor is connected to the inner piston, the piston and the cylinder Sliding fit for sealing; chamber a formed by the cylinder, piston, inner piston rod, inner piston and cylinder bottom communicates with the external oil circuit through port A, and chamber b formed by the cylinder, piston, piston rod and cylinder head passes through B port is connected with the external oil circuit; the t cavity formed by the inner piston, piston rod and shoulder is connected to the external atmosphere through the T port. It has the characteristics of long stroke, high stability, single rod, two acting areas are approximately equal, double-end buffer capacity, and built-in displacement sensor.

Description

A single-rod double-acting area approximately equal hydraulic cylinder with a built-in displacement sensor

Technical field

The utility model relates to a fluid pressure actuator, in particular to a hydraulic cylinder with a single rod with a built-in displacement sensor and double action areas with approximately equal areas.

Background technique

A hydraulic cylinder is an actuator that converts hydraulic energy into mechanical energy for linear motion. Symmetrical hydraulic cylinders refer to double-acting hydraulic cylinders with the same two active surfaces. Existing symmetrical hydraulic cylinders are generally double-rod hydraulic cylinders, while single-rod hydraulic cylinders have unequal two active areas and are asymmetrical cylinders. In the past, it was also proposed that the single-rod and double-acting surfaces are approximately symmetrical hydraulic cylinders, one of which is on the inner piston rod (or inner cylinder). When the hydraulic cylinder is working, the inner piston rod (or inner cylinder) bears a large force. Pressure, when the stroke of the hydraulic cylinder is very long, in order to ensure the structural stability of the hydraulic cylinder, the inner piston rod (or inner cylinder) of the hydraulic cylinder must be made very thick, so that when the piston rod moves, the flow rate of the system is relatively large. Large, the flow and stability of this hydraulic cylinder are contradictory. The utility model combines the advantages of the symmetrical hydraulic cylinder and the single-rod hydraulic cylinder well, and the inner piston rod does not bear high pressure, and the flow rate of the hydraulic cylinder is not related to the diameter of the inner piston rod, which solves the problem of hydraulic pressure well. The contradiction between cylinder flow and stability ensures that the improvement of hydraulic cylinder stability and the improvement of hydraulic cylinder flow are relatively independent. A single-rod double-acting surface approximate symmetrical hydraulic cylinder with built-in displacement sensor is proposed, which has long stroke and high stability. The characteristics of single rod, effective area of the two acting surfaces of the hydraulic cylinder are approximately equal, the hydraulic cylinder has the characteristics of double-end buffer capacity and built-in displacement sensor. It is a breakthrough in hydraulic cylinder technology and can be widely used in hydraulic systems.

Contents of the invention

The purpose of this utility model is to provide a hydraulic cylinder with a single rod with a built-in displacement sensor and double acting areas that are approximately equal. It has the characteristics of double-end buffer capacity and built-in displacement sensor.

In order to achieve the above-mentioned purpose, the technical scheme that the utility model adopts is: comprise cylinder barrel, piston, piston rod, inner piston rod, shift sensor sliding sleeve, inner piston, displacement sensor, cylinder bottom, cylinder cover; Wherein:

The bottom of the cylinder is fixedly connected with one end of the inner piston rod, and the boss at one end of the piston can match the groove at the bottom of the cylinder. After the boss at the other end of the piston is fixedly connected with one end of the piston rod, it is installed between the cylinder barrel and the inner piston rod. There is a sealed sliding fit between the piston and the cylinder, and there is a groove on the cylinder head that can match the other boss of the piston. The other end of the piston rod is a sealed sliding fit with the through hole on the cylinder head and extends out of the cylinder Outside the cylinder, the other end of the inner piston rod is equipped with an inner piston. The inner piston and the inner hole of the piston rod are in a sealed sliding fit. On the shoulder in the rod hole, there is a through hole in the axial direction of the shoulder, and the displacement sensor sliding sleeve that is slidingly matched with the displacement sensor is fixed on the inner top of the inner piston rod, and the displacement sensor and the inner piston are in a sealed sliding fit; There are A port and B port at both ends of the side of the barrel, and the axial through hole of the shoulder forms the T port. The a cavity formed by the cylinder, piston, piston rod, inner piston rod, inner piston and cylinder bottom passes through the A port. It communicates with the external oil circuit; the b chamber formed by the cylinder, piston, piston rod and cylinder head communicates with the external oil circuit through the B port; the t chamber formed by the inner piston, piston rod and shoulder communicates with the external atmosphere through the T port.

Compared with the background technology, the utility model has the beneficial effects that: the advantages of the symmetrical hydraulic cylinder and the single-rod hydraulic cylinder are well combined, and the inner piston rod does not bear high pressure, and the flow rate of the hydraulic cylinder and the inner The diameter of the piston rod is irrelevant, which solves the contradiction between the flow and stability of the hydraulic cylinder very well, and ensures that the improvement of the stability of the hydraulic cylinder and the improvement of the flow of the hydraulic cylinder are relatively independent. A single-rod double-action with a built-in displacement sensor is proposed The hydraulic cylinder scheme with approximately equal areas has the characteristics of long stroke, high stability, single rod, approximately equal effective areas of the two acting surfaces of the hydraulic cylinder, double-end buffering capacity of the hydraulic cylinder, and built-in displacement sensors. It is a breakthrough in hydraulic cylinder technology and can be widely used in hydraulic systems.

Description of drawings

Accompanying drawing is the structural principle schematic diagram of the utility model;

In the figure: 1 cylinder, 2 piston, 3 piston rod, 4 inner piston rod, 5 displacement sensor sliding sleeve, 6 inner piston, 7 displacement sensor, 8, 9, 10, 11 sealing ring, 12 cylinder bottom, 13 cylinder head , 14 shoulders, A, B port for the oil inlet and outlet, T port through the atmosphere, I, II two cylinder surface, a, b, t three chambers.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

As shown in the drawings, the utility model includes a cylinder 1, a piston 2, a piston rod 3, an inner piston rod 4, a sliding sleeve 5 for a sensor, an inner piston 6, a displacement sensor 7, a cylinder bottom 12, and a cylinder cover 13; wherein:

The cylinder bottom 12 is fixedly connected with one end of the inner piston rod 4, and the boss at one end of the piston 2 can match the groove of the cylinder bottom 12. After the boss at the other end of the piston 2 is fixedly connected with one end of the piston rod 3, it is installed in the cylinder Between the inner piston rod 4, the piston 2 and the cylinder barrel 1 are in a sealed sliding fit, and the cylinder cover 13 has a groove that can cooperate with the other boss of the piston 2, and the other end of the piston rod 3 is connected to the cylinder cover 13. The through hole on the top is a sealed sliding fit and extends out of the cylinder 1, the other end of the inner piston rod 4 is equipped with an inner piston 6, and the inner piston 6 and the inner hole of the piston rod 3 are a sealed sliding fit, and the piston rod 3 and A displacement sensor 7 is installed in the inner piston rod 4 and the inner piston 6, and one end of the main body of the displacement sensor 7 is fixed on the shoulder 14 in the hole of the piston rod 3. The displacement sensor sliding sleeve 5 is fixed on the inner top of the inner piston rod 4, and the displacement sensor 7 and the inner piston 6 are in a sealed sliding fit; the two ends of the side of the cylinder 1 are respectively provided with A port and B port, and the shoulder 14 Axial through hole forms T port, a cavity formed by cylinder 1, piston 2, piston rod 3, inner piston rod 4, inner piston 6 and cylinder bottom 12 communicates with external oil circuit through A port; cylinder 1, Chamber b formed by piston 2, piston rod 3 and cylinder head 13 communicates with external oil circuit through port B; chamber t formed by inner piston 6, piston rod 3 and shoulder 14 communicates with external atmosphere through port T.

Sealing rings 8, 9, 10, 11 are installed between the inner piston 6 and the sensor 7, between the inner piston 6 and the piston rod 3, between the piston rod 3 and the middle hole of the cylinder head 13, and between the piston 2 and the cylinder barrel 1.

The working principle of the utility model is as follows:

The hydraulic cylinder has only one acting rod, that is, the piston rod 3. The two acting surfaces of the hydraulic cylinder are the piston 2 and the two sides of the piston-surface I and surface II. When designing the hydraulic cylinder, the areas of the two acting surfaces are matched to be approximately equal. In order to achieve the control performance of the symmetrical cylinder. The inner piston rod 4 does not bear high pressure, and the diameters of the inner piston rod 4 and the piston rod 3 will not affect the size of the hydraulic cylinder’s effective area, so the inner piston rod 4 and the piston rod 3 can be designed thicker during design, so as to ensure The hydraulic cylinder has strong stability and will not increase the flow rate of the hydraulic cylinder when it is working.

The inner piston 6 not only has the functions of sealing and guiding, but also serves as the fulcrum of the top end of the inner piston rod 4 to improve the stability of the inner piston rod 4 .

When working, the T port is open to the atmosphere, and during the extension of the piston rod 3, oil enters the A port of the hydraulic cylinder, and the piston rod 3 is pushed out through the effective surface I of the a chamber, and the oil is discharged from the B port, and the hydraulic oil in the b chamber passes through the B port. During the retraction process of the piston rod 3, oil enters the B port of the hydraulic cylinder, the hydraulic oil enters the chamber b, pushes the piston rod 3 to retract through the effective surface II of the chamber b, the oil exits the port A, and the hydraulic oil in the chamber a passes through Port A is discharged.

When the piston 2 moves close to the cylinder bottom 12, the buffer mechanism of the piston 2 and the cylinder bottom 12 makes the piston 2 and the piston rod 3 enter the buffer stroke of the hydraulic cylinder; when the piston 2 moves close to the cylinder head 13, the buffer mechanism of the piston 2 and the cylinder head 13 The mechanism makes the piston 2 and the piston rod 3 enter the buffer stroke of the hydraulic cylinder.

The hydraulic cylinder has a built-in displacement sensor 7, which is installed inside the hollow piston rod 3, the inner piston rod 4 and the inner piston 6, and has a compact structure. When the hydraulic cylinder is working, the displacement sensor sliding sleeve 5 is fixed, and the displacement sensor 7 The main body moves with the piston rod 3, and accurately feeds back the displacement signal of the piston rod 3 in real time.

Claims (2)

1. A hydraulic cylinder with a single rod with a built-in displacement sensor and double acting areas approximately equal, characterized in that it includes: a cylinder (1), a piston (2), a piston rod (3), an inner piston rod (4), a displacement Sensor sliding sleeve (5), inner piston (6), displacement sensor (7), cylinder bottom (12), cylinder head (13); where: The bottom of the cylinder (12) is fixedly connected with one end of the inner piston rod (4), the boss at one end of the piston (2) can match the groove of the bottom of the cylinder (12), and the boss at the other end of the piston (2) is connected with the piston rod (3 ) is installed between the cylinder (1) and the inner piston rod (4), the piston (2) and the cylinder (1) are in a sealed sliding fit, and the cylinder cover (13) is provided with a The groove matched with the other boss of the piston (2), the other end of the piston rod (3) and the through hole on the cylinder head (13) are a sealed sliding fit and stretch out of the cylinder (1), and the inner piston The other end of the rod (4) is equipped with an inner piston (6), and the inner piston (6) is in a sealed sliding fit with the inner hole of the piston rod (3), and the piston rod (3) and the inner piston rod (4) and the inner piston (6) Displacement sensor (7) is installed inside, and one end of displacement sensor (7) main body is fixed on the shoulder (14) in the piston rod (3) hole, and shoulder (14) axially has through hole, and displacement The displacement sensor sliding sleeve (5) of the sensor (7) is fixed on the inner top of the inner piston rod (4), and the displacement sensor (7) and the inner piston (6) are in a sealed sliding fit; the cylinder barrel (1) The two ends of the side are respectively provided with A port and B port, and the axial through hole of the shoulder (14) forms a T port, which consists of a cylinder (1), a piston (2), a piston rod (3), an inner piston rod (4 ), the cavity a formed by the inner piston (6) and the cylinder bottom (12) communicates with the external oil circuit through port A; it is formed by the cylinder barrel (1), piston (2), piston rod (3) and cylinder cover (13) Chamber b of the chamber communicates with the external oil circuit through port B; chamber t formed by the inner piston (6), piston rod (3) and shoulder (14) communicates with the external atmosphere through port T. 2. A hydraulic cylinder with a built-in displacement sensor and a single rod with approximately equal double acting areas according to claim 1, characterized in that: between the inner piston (6) and the sensor (7), and between the inner piston (6) and the piston rod (3), between the piston rod (3) and the middle hole of the cylinder cover (13), and between the piston (2) and the cylinder (1) are respectively equipped with sealing rings (8), (9), (10), (11 ).