Rotary joint hydraulic cylinder with built-in sensor protection pipe

Abstract

The utility model discloses a rotary joint hydraulic cylinder with a built-in sensor protection tube, which comprises a rotary hydraulic component, a hydraulic cylinder body, a rotary joint, a connecting flange and a displacement sensor, and the rotary hydraulic component comprises a piston rod, a cylinder head, a cylinder body, a piston body, a cylinder bottom, the rotary joint, the connecting flange and the displacement sensor. The cylinder head and the cylinder bottom are fixed to the two ends of the cylinder body respectively, the piston body is sleeved with one end in the cylinder body, the piston rod is slidably connected to the inner side face of the piston body, one end of the piston rod extends to the outer side of the cylinder head, the rotating connector is fixed to the end of the cylinder bottom, the connecting flange is fixed to the end of the rotating connector, and the displacement sensor is fixed to the end of the connecting flange. The hydraulic cylinder with the built-in displacement sensor and the rotary joint is modified, the structure is compact, the disassembly, assembly and maintenance are convenient, the service life is long, the reliability is high, the purposes of reducing parts and improving the reliability are achieved by canceling parts such as a switching device and a connecting rod, supporting points at the bottom of the cylinder are reduced, the structure is simpler, and the cost is lower. And processing, installation and later maintenance are more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic cylinder technical field especially is related to a built -in sensor protection tube's rotary joint hydraulic cylinder. BACKGROUND

[0002] Hydraulic cylinder is the key component in hydraulic transmission system, it generates force and motion through liquid pressure, realizes linear reciprocating motion or swing motion, and this energy conversion device is particularly important in the industrial field, is widely applied because of simple structure, reliable work.

[0003] The existing hydraulic cylinder with built-in displacement sensor and standard rotary joint, because the distance of two oil passing holes communicated with the oil cylinder of the standard rotary joint is too close, when the magnetostrictive displacement sensor is added, the sealing design of the oil cylinder and the sensor will be affected, therefore, a transition adapter needs to be designed between the rotary joint and the hydraulic cylinder, when actually installing and using, the above-mentioned hydraulic cylinder is longer due to the addition of the transition adapter, the stability of the oil cylinder is weakened, the complexity of the oil cylinder is increased, and the manufacturing and maintenance costs are increased, therefore, a built-in sensor protection tube's rotary joint hydraulic cylinder. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a built-in sensor protection tube's rotary joint hydraulic cylinder, to solve the problem that the existing hydraulic cylinder with built-in displacement sensor and standard rotary joint is added magnetostrictive displacement sensor, and the sealing design of the oil cylinder and the sensor will be affected, therefore, a transition adapter needs to be designed between the rotary joint and the hydraulic cylinder, when actually installing and using, the above-mentioned hydraulic cylinder is longer due to the addition of the transition adapter, the stability of the oil cylinder is weakened, the complexity of the oil cylinder is increased, and the manufacturing and maintenance costs are increased.

[0005] To solve the above technical problem, the utility model is realized through the following technical schemes:

[0006] The utility model discloses a built-in sensor protection tube's rotary joint hydraulic cylinder, which comprises:

[0007] The rotary hydraulic assembly comprises a piston rod, a cylinder head, a cylinder body, a piston body, a cylinder bottom, a rotary joint, a connecting flange and a displacement sensor. The cylinder head and the cylinder bottom are fixed at both ends of the cylinder body, the piston body is sleeved at one end of the cylinder body, the piston rod is slidably connected to the inner side of the piston body, and one end of the piston rod extends to the outside of the cylinder head. The rotary joint is fixed at the end of the cylinder bottom, the connecting flange is fixed at the end of the rotary joint, and the displacement sensor is fixed at the end of the connecting flange.

[0008] Further, the piston rod surface is provided with a mounting hole and a position avoiding hole, the inner side of the piston rod is fixedly connected with a magnetic block seat, a magnetic ring and a copper ring, and the magnetic block seat, the magnetic ring and the copper ring are staggered.

[0009] Further, a sealing ring is arranged between the outer side of the piston body and the inner side of the cylinder body, and a sensor protection tube is fixedly connected to the inner side of the cylinder bottom.

[0010] Further, the rotary joint is located between the displacement sensor and the cylinder bottom, one side of the rotary joint is fixedly connected with an oil port, and the other side is fixedly connected with a oil discharge port.

[0011] Further, a through hole is formed in the center of the cylinder bottom, one end of the sensor protection tube is closed, and the other end is fixed to the inner side of the through hole, and the cylinder bottom and the sensor protection tube form a blind hole structure.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] The utility model discloses a hydraulic cylinder with built-in displacement sensor and rotary joint, which is compact in structure, convenient to disassemble and maintain, long in service life and high in reliability. The rotary joint and the hydraulic cylinder are directly connected, which reduces the intermediate adapter, reduces the cumulative size tolerance and shape tolerance error range, and effectively guarantees the size tolerance and shape tolerance requirements. The sensor protection tube is fixed to the cylinder bottom by welding, which cancels the sealing element, improves the sealing performance and reliability, effectively reduces the economic cost, reduces the support point at the cylinder bottom, and is simple in structure and convenient to process, install and maintain.

[0014] Based on beneficial effect one, the rotary joint and the hydraulic cylinder are directly connected, which reduces the intermediate adapter, reduces the possible leakage point of the intermediate adapter, and effectively reduces the leakage risk. The rotary joint and the hydraulic cylinder are directly connected, which shortens the length of the hydraulic cylinder and reduces the total weight, and effectively improves the stability of the hydraulic cylinder during rotation. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0016] Figure 1 It is the whole structure schematic diagram of the utility model;

[0017] Figure 2 The utility model discloses Figure 1 The enlarged structure schematic diagram of middle A place.

[0018] In the drawing, the component list that each sign represents is as follows:

[0019] 1, piston rod;2, cylinder head;3, cylinder body;4, piston body;5, cylinder bottom;6, rotary joint;7, connecting flange;8, displacement sensor;9, magnetic block seat;10, magnetic ring;11, copper ring;12, sensor protection tube;13, oil port;14, oil drain port. Specific implementation

[0020] In order to make the above purpose, features and advantages of the utility model more apparent and easy to understand, the specific implementation of the utility model is explained in detail below with the drawings.

[0021] In the following description, a lot of specific details are set forth in order to fully understand the utility model, but the utility model can also be implemented in other ways different from the description herein, and those skilled in the art can make similar generalization without departing from the connotation of the utility model, therefore the utility model is not limited by the specific implementation disclosed below.

[0022] In order to make the purpose, technical scheme and advantage of the utility model more clear, the implementation of the utility model will be described in further detail below with the drawings.

[0023] Please refer to Figures 1-2 As shown in the drawing, the embodiment is a rotary joint hydraulic cylinder with built-in sensor protection tube, which comprises:

[0024] Rotary hydraulic assembly, rotary hydraulic assembly includes piston rod 1, cylinder head 2, cylinder body 3, piston body 4, cylinder bottom 5, rotary joint 6, connecting flange 7 and displacement sensor 8;Cylinder head 2 and cylinder bottom 5 are fixed at both ends of cylinder body 3, piston body 4 is sleeved at one end inside cylinder body 3, piston rod 1 is slidably connected to the inner side of piston body 4, and one end extends to the outside of cylinder head 2, rotary joint 6 is fixed at the end of cylinder bottom 5, connecting flange 7 is fixed at the end of rotary joint 6, and displacement sensor 8 is fixed at the end of connecting flange 7;

[0025] Cylinder body 3 is used for the connection of cylinder head 2 and cylinder bottom 5, piston body 4 is used for the connection between piston rod 1 and cylinder body 3, piston body 4 makes the inside of cylinder body 3 form a rod cavity and a rodless cavity, piston rod 1 is used for the connection of magnetic ring 10, magnetic block seat 9 and copper ring 11, rotary joint 6 is used for the connection of connecting flange 7, connecting flange 7 is used for the connection of displacement sensor 8, and displacement sensor 8 senses the movement of position.

[0026] The piston rod 1 is provided with mounting holes and position avoiding holes, and the inner side of the piston rod 1 is fixedly connected with a magnetic block seat 9, a magnetic ring 10 and a copper ring 11, and the magnetic block seat 9, the magnetic ring 10 and the copper ring 11 are staggered;

[0027] A sealing ring is arranged between the outer side of the piston body 4 and the inner side of the cylinder body 3, and a sensor protection pipe 12 is fixedly connected to the inner side of the cylinder bottom 5;

[0028] The mounting holes and the position avoiding holes are used for connecting the magnetic block seat 9, the magnetic ring 10, the copper ring 11 and the piston rod 1, so that the magnetic ring 10 and the piston rod 1 can move synchronously, the sealing ring is used for blocking the gap between the piston body 4 and the cylinder body 3, one end of the sensor protection pipe 12 extends to the inner side of the piston rod 1, and the inner side of the hollow piston rod 1 is provided with a sufficient gap from the sensor protection pipe 12, and the sensor protection pipe 12 is fixed by full circumferential welding, and a sealing element is not arranged on the inner side of the sensor protection pipe 12.

[0029] The rotary joint 6 is located between the displacement sensor 8 and the cylinder bottom 5, one side of the rotary joint 6 is fixedly connected with an oil port 13, and the other side is fixedly connected with a drain port 14;

[0030] The electronic bin of the displacement sensor 8 is arranged on the end surface of the connecting flange 7, the measuring rod of the displacement sensor 8 extends from the inner side of the rotary joint 6, passes through the cylinder bottom 5 and extends to the inner side of the sensor protection pipe 12, and the outer side of the measuring rod of the displacement sensor 8 is provided with a sufficient gap from the inner side of the sensor protection pipe 12.

[0031] A through hole is formed in the center of the cylinder bottom 5, one end of the sensor protection pipe 12 is closed, and the other end is fixed to the inner side of the through hole, and the cylinder bottom 5 and the sensor protection pipe 12 form a blind hole structure;

[0032] The measuring rod of the sensor passes through the protection pipe, one end of the sensor protection pipe 12 is closed, and the other end is arranged on the inner side of the through hole in the center of the cylinder bottom 5, the sensor protection pipe 12 is fixedly connected to the cylinder bottom 5 by a welding seam, that is, the cylinder bottom 5 and the hollow sensor protection pipe 12 form a blind hole structure.

[0033] Working principle: the rotary joint 6 is directly installed at the cylinder bottom 5, the adapter between the hydraulic cylinder and the rotary joint 6 is omitted, the magnetic ring 10 of the displacement sensor 8 is installed at the bottom of the piston rod 1 of the hydraulic cylinder, the connecting rod is omitted, when the piston rod 1 moves, the magnetic ring 10 moves synchronously, the inner side of the cylinder bottom 5 does not need to be provided with a sealing element, the supporting point at the cylinder bottom 5 is reduced, the structure is simpler, and the processing, installation and later maintenance are more convenient, the welding replaces the sealing between the oil cylinder and the sensor, the gap between the sensor protection pipe 12 and the inner side of the cylinder bottom 5 is blocked, the sealing effect is achieved, the sealing element and the processing procedure of the sealing element groove are omitted;

[0034] The above steps can improve the functionality of the self.

[0035] In the description of the utility model, still need to explain, unless have explicit provision and limitation, term " set ", " install ", " link ", " connect " should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can indirectly connect through intermediate medium, can be two element internal communication. For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0036] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and is not used to limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model, should be included in the protection scope of the utility model.

Claims

1. A rotary union hydraulic cylinder with a built-in sensor guard tube, characterized by, Include: Rotary hydraulic assembly, the rotary hydraulic assembly includes piston rod (1), cylinder head (2), cylinder body (3), piston body (4), cylinder bottom (5), rotary joint (6), connecting flange (7) and displacement sensor (8);The cylinder head (2) and cylinder bottom (5) are fixed at both ends of the cylinder body (3), the piston body (4) is sleeved at one end inside the cylinder body (3), the piston rod (1) is slidably connected to the inner side of the piston body (4), and one end extends to the outside of the cylinder head (2), the rotary joint (6) is fixed at the end of the cylinder bottom (5), the connecting flange (7) is fixed at the end of the rotary joint (6), and the displacement sensor (8) is fixed at the end of the connecting flange (7).

2. A hydraulic cylinder with a rotary joint and a built-in sensor protector tube according to claim 1, characterized in that, The surface of the piston rod (1) is provided with a mounting hole and a position avoiding hole, the inner side of the piston rod (1) is fixedly connected with a magnetic block seat (9), a magnetic ring (10) and a copper ring (11), and the magnetic block seat (9), the magnetic ring (10) and the copper ring (11) are staggered.

3. A hydraulic cylinder with a rotary joint and a built-in sensor protector tube according to claim 1, characterized in that, The outer side of the piston body (4) and the inner side of the cylinder body (3) are sleeved with a sealing ring, and the inner side of the cylinder bottom (5) is fixedly connected with a sensor protection tube (12).

4. The hydraulic cylinder with a rotary joint and a built-in sensor protector tube according to claim 1, characterized in that, The rotary joint (6) is located between the displacement sensor (8) and the cylinder bottom (5), one side of the rotary joint (6) is fixedly connected with an oil port (13), and the other side is fixedly connected with a oil drain (14).

5. A hydraulic cylinder with a rotary joint and a built-in sensor protector tube according to claim 1, characterized in that, The cylinder bottom (5) is provided with a through hole in the center, one end of the sensor protection tube (12) is closed, the other end is fixed to the inner side of the through hole, and the cylinder bottom (5) and the sensor protection tube (12) form a blind hole structure.

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