CN220378594U

CN220378594U - Oil cylinder of external sensor

Info

Publication number: CN220378594U
Application number: CN202321540063.7U
Authority: CN
Inventors: 邱永宁; 孟文锦; 耿保炯; 苏雪平
Original assignee: Jiangsu Hengli Hydraulic Co Ltd
Current assignee: Jiangsu Hengli Hydraulic Co Ltd
Priority date: 2023-06-16
Filing date: 2023-06-16
Publication date: 2024-01-23
Anticipated expiration: 2033-06-16

Abstract

The utility model discloses an oil cylinder of an external sensor, which comprises a cylinder body, wherein a piston and a piston rod are arranged in the cylinder body, a sensor measuring rod parallel to the piston rod is fixedly arranged outside the cylinder body, a mounting block is connected to the piston rod, and the mounting block is locked on the piston rod through a locking piece and is close to one end of the piston. The mounting block is internally provided with a magnet, and the magnet faces the sensor measuring rod. Through the mode, the magnet is independently installed on the installation block separated from the piston, so that the magnet and the piston are separately arranged, and the measuring precision is ensured by limiting the movement of the installation block.

Description

Oil cylinder of external sensor

Technical Field

The utility model relates to the field of oil cylinders, in particular to an oil cylinder with an external sensor.

Background

As shown in fig. 6, the external sensor is composed of a measuring rod and a magnet, the measuring rod is fixed on the outer wall of the cylinder, the magnet is arranged on the inner side of the cylinder and is fixed with the piston to do axial linear motion, and in the process that the piston drives the magnet block to do axial motion, the magnetic field sequentially passes through the sensing element in the measuring rod, so that the sensing element obtains an excitation signal and feeds back to the processing unit. However, the thicker cylinder has a shielding effect on the magnetic field, which weakens the magnetic field. The weakened magnetic field can cause inaccurate measurement of the induction element and affect measurement accuracy. In order to obtain a stronger magnetic field, the magnet needs to be designed into a minor-arc D-shaped magnet, so that the magnet block needs to ensure the deflection angle with the measuring rod in order to obtain the magnetic flux of the measuring rod to the greatest extent.

In the prior art, only one nut is used for applying torque to fix the piston and the magnetic block thereof, the scheme can only limit the axial movement of the piston, but the piston can be driven to rotate along with the piston due to the existence of friction force in the nut screwing process, the following angle is uncontrollable, the magnetic block can be deflected due to the fact that vibration is generated in the working process of the oil cylinder and the magnetic block is not directional, the magnetic field area and the measuring rod can be caused to have angle deviation, and the measuring precision of the measuring rod is affected.

Disclosure of Invention

The utility model mainly solves the technical problem of providing the oil cylinder with the external sensor, which is characterized in that a magnet is independently arranged on a mounting block separated from a piston, so that the magnet and the piston are separately arranged, and the measuring precision is ensured by limiting the movement of the mounting block.

In order to solve the technical problems, the utility model adopts a technical scheme that: the utility model provides an external sensor's hydro-cylinder, including the cylinder body, be equipped with piston and piston rod in the cylinder body, the cylinder body has set firmly the sensor measuring staff parallel with the piston rod outward, be connected with the installation piece on the piston rod, the installation piece passes through the retaining member locking on the piston rod to press close to piston one end, be equipped with magnet in the installation piece, magnet orientation sensor measuring staff.

In a preferred embodiment of the present utility model, the mounting block is provided with a mounting groove, and the magnet is disposed in the mounting groove.

In a preferred embodiment of the utility model, the mounting block is located at the forward end of the piston which is threadedly attached to the piston rod to axially lock the mounting block.

In a preferred embodiment of the utility model, the mounting block is located at the rear end of the piston, and the piston rod is threadably connected to a nut located at the rear end of the mounting block for axially locking the mounting block.

In a preferred embodiment of the utility model, the piston rod is provided with a step structure matched with the mounting block, radial locking holes are formed in the outer circles of the step structure and the mounting block, and the locking piece is connected in the locking holes to lock the mounting block.

In a preferred embodiment of the present utility model, the locking member is a locking screw.

In a preferred embodiment of the utility model, the piston rod is provided with a step structure matched with the mounting block, the end surfaces of the mounting block and the step structure are provided with axial positioning holes, and the locking piece is embedded into the positioning holes to lock the mounting block.

In a preferred embodiment of the present utility model, the locking member is a positioning pin.

The beneficial effects of the utility model are as follows: according to the oil cylinder of the external sensor, the magnet is placed in the mounting block, and the mounting block is independently connected to the piston rod, so that the problem that the magnet rotates along with the piston to influence the measurement accuracy is avoided, and the problem of circumferential follow-up rotation of the magnet in the axial locking process is solved.

According to the oil cylinder of the external sensor, the mounting block is locked and positioned with the piston rod through the locking piece, so that the mounting block is prevented from moving relative to the sensor measuring rod in the circumferential direction, the magnet and the sensor measuring rod are prevented from being angularly offset, and the measuring accuracy of the measuring rod is ensured.

Drawings

For a clearer description of the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:

FIG. 1 is a schematic diagram of a cylinder with an external sensor according to a preferred embodiment of the present utility model;

FIG. 2 is a partial schematic view of the structure of FIG. 1;

FIG. 3 is a schematic diagram of another embodiment of an external sensor cylinder;

FIG. 4 is a D-D sectional view of FIG. 3;

FIG. 5 is a schematic diagram of another embodiment of an external sensor cylinder;

FIG. 6 is a schematic diagram of a prior art external sensor cylinder;

the components in the drawings are marked as follows: 1. the device comprises a cylinder body, 2, a piston, 3, a piston rod, 4, a mounting block, 5, a magnet, 6, a sensor measuring rod, 7, a locking piece, 8 and a nut.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below. The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and are not intended to limit the scope of the utility model, since any modification, variation in proportions, or adjustment of the size, etc. of the structures, proportions, etc. should be considered as falling within the spirit and scope of the utility model, without affecting the effect or achievement of the objective. Also, the terms "upper", "lower", "left", "right", "middle", and the like are used herein for descriptive purposes only and are not intended to limit the scope of the utility model for modification or adjustment of the relative relationships thereof, as they are also considered within the scope of the utility model without substantial modification to the technical context.

In embodiment 1, referring to fig. 1 and 2, an oil cylinder with an external sensor includes a cylinder body 1, a piston 2 and a piston rod 3 are disposed in the cylinder body 1, and an oil port is correspondingly disposed on the cylinder body 1. A sensor measuring rod 6 parallel to the piston rod 3 is fixedly arranged outside the cylinder body 1. Other structures outside the oil cylinder are structures of a conventional external sensor oil cylinder, and are not repeated here.

The piston rod 3 is connected with a mounting block 4, a mounting groove is formed in the mounting block 4, a magnet 5 is arranged in the mounting groove, a magnet 5 is arranged in the mounting block 4, and the magnet 5 faces to the sensor measuring rod 6. The mounting block 4 is located at the rear end of the piston 2. The piston rod 3 is provided with a step structure matched with the mounting block 4, radial locking holes are formed in the outer circles of the step structure and the mounting block 4, and the locking piece 7 is connected in the locking holes to lock the mounting block 4. The locking member 7 is a locking screw. The locking screw and the mounting block 4 are fixed on the piston rod 3 through the radial locking hole to prevent the mounting block 4 from rotating circumferentially.

The piston rod 3 is connected with a nut 8 in a threaded manner, and the nut 8 is positioned at the rear end of the mounting block 4 to axially lock the mounting block 4. Through adding moment to nut 8 with installation piece 4 along the axial fixity, the frictional torque between nut 8 and the installation piece 4 is insufficient in the scheme to cut off locking screw, and the vibrations that produce in the hydro-cylinder course of working also are insufficient for making magnet 5 and installation piece 4 rotate, can provide higher assembly precision.

In embodiment 2, please refer to fig. 3 and 4, an oil cylinder with an external sensor includes a cylinder body 1, a piston 2 and a piston rod 3 are disposed in the cylinder body 1, and an oil port is correspondingly disposed on the cylinder body 1. A sensor measuring rod 6 parallel to the piston rod 3 is fixedly arranged outside the cylinder body 1. Other structures outside the oil cylinder are structures of a conventional external sensor oil cylinder, and are not repeated here.

The piston rod 3 is connected with a mounting block 4, a mounting groove is formed in the mounting block 4, a magnet 5 is arranged in the mounting block 4, and the magnet 5 faces to the sensor measuring rod 6. The mounting block 4 is positioned at the front end of the piston, and the piston 2 is in threaded connection with the piston rod 3 to axially lock the mounting block 4. The front end mounting block 4 is clamped by the additional torque of the threads of the piston 2, the axial movement of the mounting block 4 is limited, and the piston 2 has the effect of tightening the piston.

The piston rod 3 is provided with a step structure matched with the mounting block 4, radial locking holes are formed in the outer circles of the step structure and the mounting block 4, and the locking piece 7 is connected in the locking holes to lock the mounting block 4. The locking screw and the mounting block 4 are fixed on the piston rod 3 through the radial locking hole to prevent the mounting block 4 from rotating circumferentially.

In embodiment 3, referring to fig. 5, the piston rod 3 has a step structure matching with the mounting block 4, and axial positioning holes are formed on the end surfaces of the mounting block 4 and the step structure, and the locking member 7 is embedded into the positioning holes to lock the mounting block 4. The locking member 7 is a positioning pin. The mounting block 4 is arranged at the front end of the piston 2, holes are correspondingly formed in the end faces of the piston rod 3 and the mounting block 4, a cylindrical locating pin is firstly arranged in the end face during assembly, then the mounting block 4 is correspondingly arranged, and the front end mounting block 4 is clamped by the mounting block 2 through self-screw threads and additional torque, so that axial movement of the front end mounting block is limited. The rest of the structure is the same as in example 2.

Compared with the prior art, the oil cylinder of the external sensor is characterized in that the magnet is independently arranged on the mounting block separated from the piston, so that the magnet and the piston are separately arranged, the measurement precision is ensured by limiting the movement of the mounting block, the absolute position of the magnet block in the cylinder barrel is ensured, and the control of the axial positioning and circumferential deflection angle tolerance of the magnet block is optimized. The problem of circumferential follow-up rotation of the magnet block in the axial locking process can be solved; the peristaltic deflection of the magnet block under the long-term vibration working condition of the oil cylinder can be solved.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims

1. The utility model provides an external sensor's hydro-cylinder, includes cylinder body (1), be equipped with piston (2) and piston rod (3) in cylinder body (1), cylinder body (1) have set firmly outward with piston rod (3) parallel sensor measuring rod (6), a serial communication port, be connected with installation piece (4) on piston rod (3), installation piece (4) pass through retaining member (7) locking on piston rod (3) to press close to piston (2) one end, be equipped with magnet (5) in installation piece (4), magnet (5) are towards sensor measuring rod (6).

2. The oil cylinder of the external sensor according to claim 1, wherein the mounting block (4) is provided with a mounting groove, and the magnet (5) is arranged in the mounting groove.

3. The oil cylinder of the external sensor according to claim 2, wherein the mounting block (4) is located at the front end of the piston (2), and the piston (2) is screwed on the piston rod (3) to axially lock the mounting block (4).

4. The oil cylinder of the external sensor according to claim 2, wherein the mounting block (4) is located at the rear end of the piston (2), a nut (8) is connected to the piston rod (3) in a threaded manner, and the nut (8) is located at the rear end of the mounting block (4) to axially lock the mounting block (4).

5. The oil cylinder of the external sensor according to claim 3 or 4, wherein the piston rod (3) is provided with a step structure matched with the mounting block (4), radial locking holes are formed in the outer circle of the step structure and the mounting block (4), and the locking piece (7) is connected in the locking holes to lock the mounting block (4).

6. The cylinder of the external sensor according to claim 5, characterized in that the locking member (7) is a locking screw.

7. The oil cylinder of the external sensor according to claim 3, wherein the piston rod (3) is provided with a step structure matched with the mounting block (4), the end surface corresponding to the mounting block (4) and the step structure is provided with an axial positioning hole, and the locking piece (7) is embedded into the positioning hole to lock the mounting block (4).

8. The cylinder of the external sensor according to claim 7, characterized in that the locking member (7) is a locating pin.