CN216478144U - Hydraulic cylinder with piston rod displacement detects function - Google Patents
Hydraulic cylinder with piston rod displacement detects function Download PDFInfo
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- CN216478144U CN216478144U CN202123033597.4U CN202123033597U CN216478144U CN 216478144 U CN216478144 U CN 216478144U CN 202123033597 U CN202123033597 U CN 202123033597U CN 216478144 U CN216478144 U CN 216478144U
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Abstract
The utility model belongs to the technical field of hydraulic cylinder, a hydraulic cylinder with piston rod displacement detects function is related to, comprising a cylinder body, piston and piston rod, the cylinder body is worn out to the one end of piston rod, the other end of piston rod has been seted up and has been kept away a chamber, be fixed with magnetostrictive displacement sensor on the cylinder body, magnetostrictive displacement sensor has one and can penetrate the waveguide silk of keeping away a intracavity, it is greater than the exocoel of keeping away a chamber to keep away the coaxial internal diameter that is equipped with in chamber outer end to keep away, the exocoel inner wall is equipped with an inner ring groove that is used for holding the retaining ring, it has an annular face to keep away between chamber and the exocoel, the clamp has annular non-magnetic gasket and the position magnet that can be passed by waveguide silk contactless between retaining ring and the annular face, annular non-magnetic gasket presses close to the annular face. The utility model discloses a non-magnetic gasket cooperation retaining ring of annular is tight with position magnet clamp, makes hydraulic cylinder position magnet be also as for the axial float when receiving impact and vibration, has guaranteed magnetostrictive displacement sensor's detection precision.
Description
Technical Field
The utility model relates to a hydraulic cylinder technical field, in particular to hydraulic cylinder with piston rod displacement detects function.
Background
The common hydraulic oil cylinder is mainly applied to occasions without special requirements on position precision due to low precision. However, in the technical fields of tire vulcanizing machines, hydraulic servo systems, petroleum, chemical engineering and the like which have higher requirements on position accuracy, the common hydraulic oil cylinder is no longer suitable. With the rapid development of science, various position detection technologies emerge endlessly, and the magnetostrictive displacement sensor shows excellent performance in the aspect of position detection. In the field of tire vulcanizing machines, a magnetostrictive displacement sensor is additionally arranged in a hydraulic oil cylinder, so that the extending length of a piston rod of the hydraulic oil cylinder is accurately detected and controlled. Usually, the magnetostrictive displacement sensor is provided with an annular non-magnetic-conductive gasket and a position magnet which are locked on the piston through a hexagon socket steel screw. When the device works, impact and vibration are inevitably generated, and long-time impact and vibration can cause the loosening of the hexagon socket steel screw, so that the detection precision of the magnetostrictive displacement sensor is influenced, and the magnetostrictive sensitive element (waveguide wire) and the position magnet are damaged.
Therefore, in order to avoid the above problems, it is necessary to provide a mounting structure for fixing a magnet of a magnetostrictive displacement sensor, so as to overcome the current defects.
Disclosure of Invention
The utility model discloses a main aim at provides a hydraulic cylinder with piston rod displacement detects function, can avoid the position magnet position not hard up, avoids vibrating to influence the displacement and detects the precision.
The utility model discloses a following technical scheme realizes above-mentioned purpose: a hydraulic oil cylinder with a piston rod displacement detection function comprises a cylinder body, a piston capable of axially moving in the cylinder body and a piston rod fixed on the piston, wherein one end of the piston rod penetrates out of the cylinder body, the other end of the piston rod is provided with an avoiding cavity, a magnetostrictive displacement sensor is fixed on the cylinder body and provided with a waveguide wire capable of penetrating into the avoiding cavity, the outer end of the avoiding cavity is coaxially provided with an outer cavity with an inner diameter larger than that of the avoiding cavity, the inner wall of the outer cavity is provided with an inner annular groove used for accommodating a check ring, an annular surface is arranged between the avoiding cavity and the outer cavity, an annular non-magnetic-conductive gasket and a position magnet are clamped between the check ring and the annular surface and can be penetrated by the waveguide wire in a non-contact mode, and the annular non-magnetic-conductive gasket is arranged on the annular surface.
Specifically, the cylinder body is formed by sequentially connecting a front cover, a cylinder pipe and a rear cover, a threaded through hole is formed in the rear cover, an external thread used for being connected with the threaded through hole is arranged at the root of the waveguide wire of the magnetostrictive displacement sensor, and a sealing sheet is clamped between the magnetostrictive displacement sensor and the outer end face of the rear cover.
Furthermore, the piston is provided with an oil seal groove surrounding the periphery of the piston and wear-resistant ring grooves positioned on two sides of the oil seal groove, and the wear-resistant ring grooves are sleeved with wear-resistant rings capable of contacting with the inner wall of the cylinder tube.
Specifically, the piston rod is the echelonment structure, including first step axle, second step axle and the third step axle that the external diameter diminishes in proper order, the exocoel is located the outer end of third step axle, the piston has the stairstepping hole, the stairstepping hole has one can support first step axle with the ladder face on the transition face of second step axle, the piston with the piston rod passes the screw locking of paying of stopping of both contact surfaces through the slant.
Furthermore, an outer ring groove is formed in the first stepped shaft, and a sealing ring used for sealing a contact surface of the stepped inner hole and the first stepped shaft is accommodated in the outer ring groove.
The utility model discloses technical scheme's beneficial effect is:
the utility model discloses a non-magnetic gasket cooperation retaining ring of annular is tight with position magnet clamp, makes hydraulic cylinder position magnet be also as for the axial float when receiving impact and vibration, has guaranteed magnetostrictive displacement sensor's detection precision.
Drawings
FIG. 1 is a partial cross-sectional view of an example hydraulic ram;
FIG. 2 is a perspective view of a magnetostrictive displacement sensor;
FIG. 3 is a perspective view of the rear cover;
FIG. 4 is a partial perspective view of the piston rod;
fig. 5 is a full sectional view of the piston.
Labeled as:
1-cylinder body, 11-cylinder pipe, 12-rear cover, 121-thread through hole;
2-piston, 21-step-shaped inner hole, 22-oil seal groove, 23-wear-resistant ring groove;
3-a piston rod, 31-an avoiding cavity, 32-an outer cavity, 321-an inner annular groove, 33-an annular surface, 34-a first stepped shaft, 341-an outer annular groove, 35-a second stepped shaft and 36-a third stepped shaft;
4-magnetostrictive displacement sensor, 41-waveguide wire, 42-position magnet and 43-external thread;
5-a retainer ring;
6-annular non-magnetic conductive gasket;
7 a-sealing piece, 7 b-sealing ring;
8-a wear-resistant ring;
9-stop screw.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The embodiment is as follows:
as shown in fig. 1 to 5, the hydraulic cylinder with piston rod displacement detection function of the present invention comprises a cylinder body 1, the piston 2 capable of moving axially in the cylinder 1 and the piston rod 3 fixed on the piston 2, one end of the piston rod 3 penetrates out of the cylinder 1, the other end of the piston rod 3 is provided with an avoiding cavity 31, a magnetostrictive displacement sensor 4 is fixed on the cylinder 1, the magnetostrictive displacement sensor 4 is provided with a waveguide wire 41 capable of penetrating into the avoiding cavity 31, the outer end of the avoiding cavity 31 is coaxially provided with an outer cavity 32 with the inner diameter larger than that of the avoiding cavity 31, the inner wall of the outer cavity 32 is provided with an inner annular groove 321 for accommodating a retainer ring 5, an annular surface 33 is arranged between the avoiding cavity 31 and the outer cavity 32, an annular non-magnetic-conductive gasket 6 and a position magnet 42 which can be contacted and penetrated by the waveguide wire 41 in a non-contact mode are clamped between the retainer ring 5 and the annular surface 33, and the annular non-magnetic-conductive gasket 6 is arranged on the annular surface 33. The position magnet 42 and the annular non-magnetic-conductive gasket 6 are both cylinders with certain thickness and hollow inner holes, the inner hole diameters of the position magnet 42 and the annular non-magnetic-conductive gasket are larger than the diameter of the waveguide wire 41, the non-contact design can ensure that the waveguide wire 41 is not abraded, and the service life of the magnetostrictive displacement sensor 4 is prolonged. The position magnet 42 generates a magnetic field when in an operative state. The annular non-magnetic-conductive gasket 6 is made of aluminum materials, the check ring 5 is made of stainless steel, the position magnet 42 can be separated from other magnetic-conductive parts in the hydraulic oil cylinder, and the hydraulic oil cylinder is prevented from receiving a plurality of electromagnetic signals, so that misoperation of the hydraulic oil cylinder is caused. The annular non-magnetic washer 6 and the position magnet 42 are sequentially inserted into the outer cavity 32 of the piston rod 3 and fixed by the retainer ring 5 being engaged in the inner annular groove 321. The annular non-magnetic gasket 6 can be matched with the retainer ring 5 to clamp the position magnet 42, so that the position magnet 42 can not axially move even if the hydraulic oil cylinder is impacted and vibrated, and the detection precision of the magnetostrictive displacement sensor 4 is ensured.
As shown in fig. 1 to 3, the cylinder block 1 is formed by sequentially connecting a front cover (not shown), a cylinder tube 11, and a rear cover 12, a screw through hole 121 is provided in the rear cover 12, the magnetostrictive displacement sensor 4 has an external screw 43 at the root of a waveguide wire 41 for connecting with the screw through hole 121, and a sealing sheet 7a is sandwiched between the magnetostrictive displacement sensor 4 and the outer end surface of the rear cover 12. The cylinder body 1 is generally manufactured by splicing, and in the embodiment, a J-shaped welding groove with a certain angle is processed at the right end of the cylinder tube 11. The J-shaped welding groove and the J-shaped welding groove of the rear cover 12 are in mirror symmetry, and welding wires are dissolved and filled in the J-shaped welding groove through welding equipment, so that the rear cover 12 and the cylinder pipe 11 are in permanent connection. The magnetostrictive displacement sensor 4 is screwed in the center of the rear cover 12, and the contact surface of the magnetostrictive displacement sensor and the rear cover is sealed by the sealing sheet 7a, so that the environmental pollution caused by the leakage of hydraulic oil is avoided. In order to effectively prevent dust, water vapor, impurities and the like in the air from entering the magnetostrictive displacement sensor 4 and affecting the accuracy of the magnetostrictive displacement sensor 4, the magnetostrictive displacement sensor 4 can be additionally provided with a protective cover for protection.
As shown in fig. 1 and 5, the piston 2 is provided with an oil seal groove 22 surrounding the outer periphery thereof and wear-resistant ring grooves 23 located on both sides of the oil seal groove 22, and the wear-resistant ring grooves 23 are fitted with wear-resistant rings 8 capable of contacting the inner wall of the cylinder tube 11. The wear-resistant ring 8 can not only avoid the scratch between the piston 2 and the cylinder tube 1, but also enable the piston rod 3 to have the capability of resisting lateral force; the oil seal groove 22 is internally provided with a piston oil seal, so that the sealing performance of the piston 2 and the cylinder pipe 11 is improved.
As shown in fig. 1, 4 and 5, the piston rod 3 is of a stepped structure and comprises a first stepped shaft 34, a second stepped shaft 35 and a third stepped shaft 36, the outer cavity 32 is located at the outer end of the third stepped shaft 36, the piston 2 is provided with a stepped inner hole 21, the stepped inner hole 21 is provided with a stepped surface capable of being abutted to the transition surface of the first stepped shaft 34 and the second stepped shaft 35, and the piston 2 and the piston rod 3 are locked by a stop screw 9 obliquely penetrating through the contact surfaces of the first stepped shaft 34 and the second stepped shaft. One side of the piston 2 is tightly attached to the stepped structure of the piston rod 3, and the other side of the piston is fixed by the set screw 9, so that the relative position of the piston 2 and the piston rod 3 is completely fixed and cannot be loosened. The outer wall of the second stepped shaft 35 may be threadedly engaged with the stepped inner bore 21.
As shown in fig. 1 and 4, the first stepped shaft 34 has an outer ring groove 341, and a seal ring 7b for sealing a contact surface between the stepped inner bore 21 and the first stepped shaft 34 is accommodated in the outer ring groove 341. The seal ring 7b increases the sealing performance between the piston 2 and the piston rod 3.
What has been described above are only some embodiments of the invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept herein, and it is intended to cover all such modifications and variations as fall within the scope of the invention.
Claims (5)
1. The utility model provides a hydraulic cylinder with piston rod displacement detects function, includes the cylinder body, can axial motion's piston in the cylinder body and be fixed in the piston rod of piston, the one end of piston rod is worn out the cylinder body, its characterized in that: the other end of the piston rod is provided with a position avoiding cavity, a magnetostrictive displacement sensor is fixed on the cylinder body and provided with a waveguide wire which can penetrate into the position avoiding cavity, the outer end of the position avoiding cavity is coaxially provided with an outer cavity with the inner diameter larger than that of the position avoiding cavity, the inner wall of the outer cavity is provided with an inner annular groove used for accommodating a check ring, an annular surface is arranged between the position avoiding cavity and the outer cavity, an annular non-magnetic-conductive gasket and a position magnet which can be penetrated by the waveguide wire are clamped between the check ring and the annular surface, and the annular non-magnetic-conductive gasket is close to the annular surface.
2. The hydraulic cylinder with the piston rod displacement detecting function according to claim 1, characterized in that: the cylinder body is formed by sequentially connecting a front cover, a cylinder pipe and a rear cover, a threaded through hole is formed in the rear cover, an external thread used for being connected with the threaded through hole is arranged at the root of the waveguide wire of the magnetostrictive displacement sensor, and a sealing sheet is clamped between the magnetostrictive displacement sensor and the outer end face of the rear cover.
3. The hydraulic cylinder with the piston rod displacement detecting function according to claim 2, characterized in that: the piston is provided with an oil seal groove surrounding the periphery of the piston and wear-resistant ring grooves positioned on two sides of the oil seal groove, and the wear-resistant ring grooves are sleeved with wear-resistant rings capable of contacting with the inner wall of the cylinder pipe.
4. The hydraulic cylinder with a piston rod displacement detection function according to claim 1, characterized in that: the piston rod is the echelonment structure, includes first step axle, second step axle and the third step axle that the external diameter diminishes in proper order, the exocoel is located the outer end of third step axle, the piston has the stairstepping hole, the stairstepping hole has one to support first step axle with the ladder face on the transition face of second step axle, the piston with the piston rod passes the screw locking of stopping of both contact surfaces through the slant.
5. The hydraulic cylinder with the piston rod displacement detecting function according to claim 4, characterized in that: the first stepped shaft is provided with an outer ring groove, and a sealing ring used for sealing the contact surface of the stepped inner hole and the first stepped shaft is accommodated in the outer ring groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123033597.4U CN216478144U (en) | 2021-12-06 | 2021-12-06 | Hydraulic cylinder with piston rod displacement detects function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123033597.4U CN216478144U (en) | 2021-12-06 | 2021-12-06 | Hydraulic cylinder with piston rod displacement detects function |
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| Publication Number | Publication Date |
|---|---|
| CN216478144U true CN216478144U (en) | 2022-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123033597.4U Active CN216478144U (en) | 2021-12-06 | 2021-12-06 | Hydraulic cylinder with piston rod displacement detects function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116464690A (en) * | 2023-06-20 | 2023-07-21 | 常州市新世力液压机械设备有限公司 | Be used for urban sewage treatment high accuracy displacement hydro-cylinder |
-
2021
- 2021-12-06 CN CN202123033597.4U patent/CN216478144U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116464690A (en) * | 2023-06-20 | 2023-07-21 | 常州市新世力液压机械设备有限公司 | Be used for urban sewage treatment high accuracy displacement hydro-cylinder |
| CN116464690B (en) * | 2023-06-20 | 2023-08-18 | 常州市新世力液压机械设备有限公司 | Be used for urban sewage treatment high accuracy displacement hydro-cylinder |
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