Shaft seat type external sensor hydraulic oil cylinder

Abstract

The invention discloses a shaft seat type external sensor hydraulic oil cylinder which comprises a hydraulic oil cylinder body, a connecting seat, a shaft seat and a telescopic displacement sensor, the hydraulic oil cylinder body and the telescopic displacement sensor are arranged in parallel, and the two ends of the telescopic displacement sensor are connected with the two ends of the hydraulic oil cylinder body through the connecting seat and the shaft seat respectively. The telescopic displacement sensor carries out telescopic motion along with stretching and retracting of the hydraulic oil cylinder, the hydraulic oil cylinder is detected through the telescopic displacement sensor, and an electronic bin of the telescopic displacement sensor is installed on a lug ring of the hydraulic oil cylinder through a connecting base. The other end of the telescopic displacement sensor penetrates through the shaft seat and is connected with a cylinder barrel of the hydraulic oil cylinder through a bent rod ball joint bearing, stable operation is guaranteed, stable signal detection is achieved, the structure is simple and compact, and assembling is easy.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic cylinders, and in particular relates to an axle seat type external sensor hydraulic cylinder. Background Art

[0002] With the rapid development of domestic construction machinery, market competition has become increasingly fierce, and the demand for export products has also increased. Customers have higher requirements for cylinders. In addition to completing the specified telescopic and pressure-maintaining functions, the demand for position signal detection has also become stronger.

[0003] Generally, hydraulic cylinders with displacement sensors either have the sensor built-in or the external displacement sensor fixed on the cylinder barrel. Both methods are not suitable for telescopic cylinders with the oil circuit integrated on the earrings and built-in core tubes, in which the piston rod is fixed and the cylinder barrel moves.

[0004] Moreover, the traditional telescopic oil cylinder with oil through the earring cannot realize the built-in position sensor due to the problem of core tube space. Although there are some solutions for external sensors, they are relatively complicated, inconvenient to disassemble and assemble, and have low reliability. Therefore, a simple and feasible position detection structure is needed. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides a shaft seat type external sensor hydraulic cylinder, in which a magnetostrictive displacement sensor is externally placed on the outside of the hydraulic cylinder, and the sensor electronic compartment is fixed on a connecting plate, and the connecting plate is mounted on the earring by screws. A sleeve and a detection piston rod are designed to realize the protection of the sensor and the fixation of the magnetic ring. The detection piston rod passes through the shaft seat, is supported by a sliding bearing and is fixed to the cylinder barrel of the hydraulic cylinder through a bent rod ball joint bearing, thereby realizing relative movement and detecting the position signal of the cylinder.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a shaft seat type external sensor hydraulic cylinder, including: a hydraulic cylinder, a connecting seat, a shaft seat, and a telescopic displacement sensor. The hydraulic cylinder and the telescopic displacement sensor are arranged in parallel, and the two ends of the telescopic displacement sensor are respectively connected to the two ends of the hydraulic cylinder through the connecting seat and the shaft seat. The telescopic displacement sensor performs telescopic movement as the hydraulic cylinder is extended and retracted, and the hydraulic cylinder is detected by the telescopic displacement sensor.

[0007] Furthermore, the electronic compartment of the telescopic displacement sensor is installed on the earring of the hydraulic cylinder through a connecting seat, and the other end of the telescopic displacement sensor passes through the shaft seat and is connected to the cylinder barrel of the hydraulic cylinder through a bent rod ball joint bearing.

[0008] Furthermore, the earring is installed at the end of the telescopic rod of the hydraulic cylinder.

[0009] Furthermore, the shaft seat is provided with a through hole for installing the hydraulic cylinder and a through hole for installing the telescopic displacement sensor, and a metal composite sliding bearing is provided between the through hole for installing the telescopic displacement sensor on the shaft seat and the telescopic displacement sensor.

[0010] Furthermore, the telescopic displacement sensor is a magnetostrictive displacement sensor, which is a device that converts position information into analog quantity based on the principle of magnetostrictive effect to achieve position detection.

[0011] Furthermore, the telescopic displacement sensor includes: a magnetic ring, a detection piston rod, a sleeve, an electronic warehouse, and a small piston. The electronic warehouse is fixed on a connecting seat so that the probe of the electronic warehouse is parallel to the hydraulic cylinder. The small piston is installed at one end of the detection piston rod. The end of the detection piston rod equipped with the small piston is sleeved on the probe of the electronic warehouse. After the other end of the detection piston rod passes through the shaft seat, it is connected to the cylinder barrel of the hydraulic cylinder through a bent rod ball joint bearing. The magnetic ring is sleeved on the detection piston rod and installed on the small piston. The sleeve is sleeved on the detection piston rod. One end of the sleeve is fixed on the electronic warehouse, and the other end is slidably connected to the detection piston rod through a guide sleeve.

[0012] Furthermore, the detection piston rod, sleeve, and probes of the electronic chamber are parallel to each other.

[0013] Furthermore, the small piston divides the interior of the sleeve into two closed cavities.

[0014] Furthermore, the sleeve is provided with two exhaust valves, which are respectively installed in two closed cavities and located at two ends of the active area of ​​the small piston in the sleeve.

[0015] The beneficial effects of the present invention are: adopting a double-rod design, when working, the cylinder barrel is moved away from the earring of the cylinder piston rod by the oil pressure, and when the detection piston rod extends out along with the cylinder barrel through the bent rod ball joint bearing at one end, the metal composite sliding bearing embedded in the shaft seat can provide support for it, and the structure has higher stability; the probe of the electronic compartment in the magnetostrictive displacement sensor is located inside the sleeve and the detection piston rod to effectively protect it from bumps and extend its service life. The various parts are connected by threads or screws, with a compact structure, easy maintenance and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; In the figure: 1. telescopic displacement sensor; 2. connecting seat; 3. exhaust plug; 4. magnetic ring; 5. guide sleeve; 6. small piston; 7. cylinder piston rod; 8. cylinder barrel; 9. detection piston rod; 10. sleeve; 11. metal composite sliding bearing; 12. shaft seat; 13. bending rod ball joint bearing. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0019] like Figure 1 As shown, a shaft seat type external sensor hydraulic cylinder includes: a hydraulic cylinder, a connecting seat 2, an shaft seat 12, and a telescopic displacement sensor 1. The hydraulic cylinder and the telescopic displacement sensor 1 are arranged in parallel. The two ends of the telescopic displacement sensor 1 are respectively connected to the two ends of the hydraulic cylinder through the connecting seat 2 and the shaft seat 12. The telescopic displacement sensor 1 performs telescopic movement as the hydraulic cylinder is extended and retracted. The hydraulic cylinder is detected by the telescopic displacement sensor 1, and each part is connected by threads or screws.

[0020] The hydraulic cylinder includes: a cylinder barrel 8, a large piston, a cylinder piston rod, and a guide sleeve 5. The cylinder barrel 8 is fixed on the shaft seat 12, and the cylinder piston rod is slidably installed in the cylinder barrel 8 through the large piston and the guide sleeve 5. The end of the cylinder piston rod extending out of one end of the cylinder barrel 8 is provided with an earring.

[0021] The electronic compartment of the telescopic displacement sensor 1 is installed on the earring of the hydraulic cylinder through the connecting seat 2, and the other end of the telescopic displacement sensor 1 passes through the shaft seat 12 and is connected to the cylinder barrel of the hydraulic cylinder through the bending rod ball joint bearing 13.

[0022] The earring is installed at the end of the telescopic rod of the hydraulic cylinder.

[0023] The shaft seat 12 is provided with a through hole for installing the hydraulic cylinder and a through hole for installing the telescopic displacement sensor 1 . A metal composite sliding bearing 11 is provided between the through hole for installing the telescopic displacement sensor 1 on the shaft seat 12 and the telescopic displacement sensor 1 .

[0024] The telescopic displacement sensor 1 is a magnetostrictive displacement sensor 1 . The magnetostrictive displacement sensor 1 is a device that converts position information into analog quantity based on the principle of magnetostrictive effect to realize position detection.

[0025] The telescopic displacement sensor 1 includes: a magnetic ring 4, a detection piston rod 9, a sleeve 10, an electronic warehouse, and a small piston 6. The electronic warehouse is fixed on the connecting seat 2 so that the probe of the electronic warehouse is parallel to the hydraulic cylinder. The small piston 6 is installed at one end of the detection piston rod 9. The end of the detection piston rod 9 with the small piston 6 is sleeved on the probe of the electronic warehouse. The other end of the detection piston rod 9 passes through the shaft seat 12 and is connected to the cylinder barrel of the hydraulic cylinder through the bent rod ball joint bearing 13. The magnetic ring 4 is sleeved on the detection piston rod 9 and installed on the small piston 6. The sleeve 10 is sleeved on the detection piston rod 9. One end of the sleeve 10 is fixed on the electronic warehouse, and the other end is slidably connected to the detection piston rod 9 through the guide sleeve 5.

[0026] The metal composite sliding bearing 11 is suitable for dry friction, which improves the displacement and guiding smoothness of the detection piston rod 9. The metal composite sliding bearing 11 is embedded between the detection piston rod 9 and the shaft seat 12 and fixed by welding. Through the bending rod ball head joint bearing 13 and the metal composite sliding bearing 11, it is ensured that no non-axial force is generated during relative movement, resulting in unsmooth operation and affecting signal detection.

[0027] The detection piston rod 9, sleeve 10, and probe of the electronic compartment are parallel to each other, which ensures smoother sliding and reduces errors.

[0028] The small piston 6 is slidably arranged in the sleeve 10, and the small piston 6 divides the interior of the sleeve 10 into two closed cavities. Two exhaust valves are provided on the sleeve 10, which are respectively installed in the two closed cavities and are located at both ends of the active area of ​​the small piston 6 in the sleeve 10. The exhaust plug 3 prevents pressure build-up to ensure that the telescopic displacement sensor 1 can be effectively detected.

[0029] The earring of the cylinder piston rod is fixed to the main machine structure through a pin shaft. The cylinder barrel 8 moves away from the earring under the oil pressure. The bent rod ball joint bearing 13 drives the magnetic ring 4 on the detection piston rod 9 away from the electronic compartment fixed on the telescopic displacement sensor 1, thereby generating relative movement and detecting the current signal value to realize the displacement detection of the cylinder body.

[0030] The present invention combines the connection and use characteristics of this type of telescopic cylinder to design a structure that is easy to disassemble and has stable signal detection. The sensor electronic compartment is connected to the earring by using a connecting plate with small space requirements. At the same time, the external sleeve 10 and the detection piston rod 9 realize the protection of the sensor and the fixation of the magnetic ring 4. The detection piston rod 9 passes through the sliding bearing embedded in the shaft seat 12, and one end is fixed to the cylinder barrel of the cylinder body using a bent rod ball joint bearing 13, which ensures smooth operation and realizes stable signal detection.

[0031] A double-rod design is adopted to prevent the earrings from being affected by the oil circuit of the hydraulic cylinder. The probe of the electronic compartment in the external magnetostrictive displacement sensor 1 is placed inside the sleeve 10 and the detection piston rod 9 to effectively protect it from bumps and extend its service life.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A shaft seat type external sensor hydraulic cylinder, characterized in that: include: A hydraulic cylinder, a connecting seat, an axle seat, and a telescopic displacement sensor. The hydraulic cylinder and the telescopic displacement sensor are arranged in parallel. The two ends of the telescopic displacement sensor are respectively connected to the two ends of the hydraulic cylinder through the connecting seat and the axle seat. The telescopic displacement sensor performs telescopic movement as the hydraulic cylinder is extended or retracted. The hydraulic cylinder is detected by the telescopic displacement sensor.

2. The shaft seat type external sensor hydraulic cylinder according to claim 1, characterized in that: The electronic compartment of the telescopic displacement sensor is installed on the earring of the hydraulic cylinder through a connecting seat, and the other end of the telescopic displacement sensor passes through the shaft seat and is connected to the cylinder barrel of the hydraulic cylinder through a bent rod ball joint bearing.

3. The shaft seat type external sensor hydraulic cylinder according to claim 2, characterized in that: The earring is mounted on the end of the telescopic rod of the hydraulic cylinder.

4. The shaft seat type external sensor hydraulic cylinder according to claim 1 or 2, characterized in that: The shaft seat is provided with a through hole for installing the hydraulic cylinder and a through hole for installing the telescopic displacement sensor. A metal composite sliding bearing is provided between the through hole for installing the telescopic displacement sensor on the shaft seat and the telescopic displacement sensor.

5. The shaft seat type external sensor hydraulic cylinder according to claim 2, characterized in that: The telescopic displacement sensor is a magnetostrictive displacement sensor.

6. The shaft seat type external sensor hydraulic cylinder according to claim 5, characterized in that: The telescopic displacement sensor includes: a magnetic ring, a detection piston rod, a sleeve, an electronic warehouse, and a small piston. The electronic warehouse is fixed on a connecting seat so that the probe of the electronic warehouse is parallel to the hydraulic cylinder. The small piston is installed at one end of the detection piston rod. The end of the detection piston rod installed with the small piston is sleeved on the probe of the electronic warehouse. The other end of the detection piston rod passes through the shaft seat and is connected to the cylinder barrel of the hydraulic cylinder through a bent rod ball joint bearing. The magnetic ring is sleeved on the detection piston rod and installed on the small piston. The sleeve is sleeved on the detection piston rod. One end of the sleeve is fixed on the electronic warehouse, and the other end is slidably connected to the detection piston rod through a guide sleeve.

7. The shaft seat type external sensor hydraulic cylinder according to claim 6, characterized in that: The detection piston rod, the sleeve, and the probes of the electronic chamber are parallel to each other.

8. The shaft seat type external sensor hydraulic cylinder according to claim 6, characterized in that: The small piston divides the interior of the sleeve into two closed cavities.

9. The shaft seat type external sensor hydraulic cylinder according to claim 8, characterized in that: The sleeve is provided with two exhaust valves which are respectively installed in two closed cavities and located at two ends of the active area of ​​the small piston in the sleeve.

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