CN215360057U - Force sensor and hydraulic bearing device - Google Patents
Force sensor and hydraulic bearing device Download PDFInfo
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- CN215360057U CN215360057U CN202120035057.0U CN202120035057U CN215360057U CN 215360057 U CN215360057 U CN 215360057U CN 202120035057 U CN202120035057 U CN 202120035057U CN 215360057 U CN215360057 U CN 215360057U
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Abstract
The utility model relates to a force sensor and a hydraulic bearing device, which comprise a piston, a cylinder body assembly with a hydraulic cavity and a pressure sensor for detecting the liquid pressure in the hydraulic cavity, wherein the cylinder body assembly is matched with the piston in a guiding and moving way in the axial direction of the piston, or the cylinder body assembly is provided with a piston dynamic sleeve matched with the piston in a guiding and moving way in the axial direction of the piston, the force sensor comprises a driving mechanism for driving the cylinder body assembly or the piston dynamic sleeve to move along the axial direction of the piston, a force measuring sensor is arranged in series on a transmission path of the driving mechanism and the cylinder body assembly or the piston dynamic sleeve, and an oil duct for feeding or discharging oil when the cylinder body assembly or the piston dynamic sleeve moves relative to the axial direction of the piston is arranged on the cylinder body assembly. The utility model solves the technical problem of inaccurate measurement caused by static friction between the piston and the cylinder body in the prior art.
Description
Technical Field
The utility model relates to a force sensor and a hydraulic bearing device in the field of mechanics.
Background
In the field of mechanics, force sensors are required to measure the output force values of various tools.
For example, when detecting the output pressure of the press machine, a commonly used force sensor includes a hydraulic cylinder, the hydraulic cylinder includes a cylinder body and a piston which is in seal movable fit with the cylinder body, a pressure sensor for detecting the pressure of liquid in the cylinder body is arranged on the cylinder body, when the output pressure of the press machine is calibrated, the pressure head of the press machine applies pressure to the piston, the pressure sensor detects the pressure of liquid in the cylinder body, and then the force applied to the piston, i.e. the output pressure of the press machine, is converted according to the effective contact area between the piston and the liquid, so as to detect the output of the press machine.
The problems with such prior art force sensors are: when the press presses the piston, static friction force is generated between the piston and the cylinder body, the static friction force influences measurement reading on one hand, and the other characteristic of the static friction force is instable, so that the reading of the pressure sensor is also instable, and finally, the measurement value is inaccurate.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a force sensor and a hydraulic bearing device, and aims to solve the technical problem of inaccurate measurement caused by static friction between a piston and a cylinder in the prior art.
In order to solve the technical problems, the technical scheme of the force sensor is as follows:
a force sensor comprises a piston and a cylinder body assembly with a hydraulic cavity, and further comprises a pressure sensor used for detecting the liquid pressure in the hydraulic cavity, wherein the cylinder body assembly is matched with the piston in a guiding and moving mode in the axial direction of the piston, or the cylinder body assembly is provided with a piston dynamic sleeve matched with the piston in a guiding and moving mode in the axial direction of the piston, the force sensor comprises a driving mechanism used for driving the cylinder body assembly or the piston dynamic sleeve to move along the axial direction of the piston, a force measuring sensor is arranged in series on a transmission path of the driving mechanism and the cylinder body assembly or the piston dynamic sleeve, and an oil duct used for oil inlet or oil outlet when the cylinder body assembly or the piston dynamic sleeve moves relative to the piston in the axial direction is arranged on the cylinder body assembly.
The oil duct comprises an oil inlet oil duct and an oil outlet oil duct, a pressure release valve is arranged on the oil outlet oil duct, and a one-way oil inlet valve is arranged on the oil inlet oil duct.
The driving mechanism drives the cylinder body assembly or the piston dynamic sleeve to move at a uniform speed along the axial direction of the piston.
The cylinder body assembly is provided with a piston dynamic sleeve which is matched with the piston in a guiding and moving mode in the axial direction of the piston, the cylinder body assembly further comprises a cylinder body fixing part, and the driving mechanism is arranged between the cylinder body fixing part and the piston dynamic sleeve.
And a dynamic sleeve rotation stopping matching structure which is matched with the piston dynamic sleeve in a rotation stopping way is arranged on the fixed part of the cylinder body.
The technical scheme of the hydraulic bearing device comprises the following steps:
the hydraulic bearing device comprises a piston and a cylinder body assembly with a hydraulic cavity, wherein the cylinder body assembly is matched with the piston in a guiding and moving mode in the axial direction of the piston, or the cylinder body assembly is provided with a piston dynamic sleeve matched with the piston in a guiding and moving mode in the axial direction of the piston, the hydraulic bearing device comprises a driving mechanism for driving the cylinder body assembly or the piston dynamic sleeve to move along the axial direction of the piston, a force measuring sensor is arranged in series in a transmission path of the driving mechanism and the cylinder body assembly or the piston dynamic sleeve, and an oil duct used for feeding or discharging oil when the cylinder body assembly or the piston dynamic sleeve moves axially relative to the piston is arranged on the cylinder body assembly.
The oil duct comprises an oil inlet oil duct and an oil outlet oil duct, a pressure release valve is arranged on the oil outlet oil duct, and a one-way oil inlet valve is arranged on the oil inlet oil duct.
The driving mechanism drives the cylinder body assembly or the piston dynamic sleeve to move at a uniform speed along the axial direction of the piston.
The cylinder body assembly is provided with a piston dynamic sleeve which is matched with the piston in a guiding and moving mode in the axial direction of the piston, the cylinder body assembly further comprises a cylinder body fixing part, and the driving mechanism is arranged between the cylinder body fixing part and the piston dynamic sleeve.
And a dynamic sleeve rotation stopping matching structure which is matched with the piston dynamic sleeve in a rotation stopping way is arranged on the fixed part of the cylinder body.
The utility model has the beneficial effects that: when the force sensor is used for detecting, the driving mechanism drives the cylinder body assembly or the piston dynamic sleeve to axially move relative to the piston, so that dynamic friction force is generated between the cylinder body assembly or the piston dynamic sleeve and the piston, and the dynamic friction force can be obtained through indicating value calculation of the pressure sensor and the force measuring sensor, so that force value detection can be accurately realized.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the force sensor of the present invention;
FIG. 2 is a force analysis diagram of the dynamic sleeve of the piston of FIG. 1;
fig. 3 is a schematic structural view of embodiment 2 of the force sensor of the present invention.
Detailed Description
An embodiment 1 of the force sensor of the present invention is shown in fig. 1 to 2: the piston 16 and a cylinder assembly with a hydraulic cavity 8 are included, the cylinder assembly comprises a cylinder fixing part 5 and a piston dynamic sleeve 14 which is assembled on the cylinder fixing part in a guiding and moving mode along the up-down direction, and the piston 16 is in sealing movable insertion connection with an inner hole of the piston dynamic sleeve 14. The outer periphery of the dynamic piston sleeve 14 is in sealing fit with the fixed cylinder part. Be provided with on the cylinder body fixed part and only rotate complex dynamic cover splines cooperation structure with the piston dynamic cover, dynamic cover splines cooperation structure in this embodiment is two vertical setting's guide bar 1, two guide bar 1 are along the even interval arrangement of 14 circumference on the piston dynamic cover, the upper end of piston dynamic cover has the dynamic cover that turns up and turns up along 15, dynamic cover turns up and is provided with the guide bar perforation of arranging with the guide bar correspondence on 15, realize the removal cooperation through linear bearing between guide bar and the guide bar perforation, because linear bearing is antifriction bearing, so the friction between guide bar and the guide bar perforation has been ignored.
And a driving mechanism 4 for driving the dynamic piston sleeve to move at a constant speed relative to the axial direction of the piston is further arranged between the fixed part of the cylinder body and the dynamic sleeve outward-turning edge of the dynamic piston sleeve, in the embodiment, the driving mechanism comprises two vertically arranged electric push rods 3 which act synchronously, and a force measuring sensor 2 is arranged between each electric push rod 3 and the dynamic sleeve outward-turning edge 15 of the dynamic piston sleeve 14. When the hydraulic pressure detection device is used, hydraulic oil is filled in the hydraulic cavity 8, the cylinder body fixing part of the cylinder body assembly is connected with a pressure sensor 6 used for detecting the liquid pressure in the hydraulic cavity, and the pressure sensor is a hydraulic pressure sensor connected with the hydraulic cavity 8 through an oil duct 7 in the embodiment. The cylinder body assembly is provided with an oil channel for oil inlet or oil outlet when the cylinder body assembly or the piston dynamic sleeve moves axially relative to the piston, the oil channel in the embodiment comprises an oil inlet channel 11 and an oil outlet channel 9 which are arranged on the fixed part of the cylinder body, the oil outlet channel is provided with a pressure release valve (not shown in the figure), and the oil inlet channel is provided with a one-way oil inlet valve (not shown in the figure). The oil inlet duct and the oil outlet duct are connected with an oil supplementing oil tank 10. Item 13 in the figure shows a seal ring between the dynamic piston sleeve and the piston, and item 12 in the figure shows a seal ring between the dynamic piston sleeve and the fixed part of the cylinder body.
When the force sensor is used for measuring force, for example, when a press machine is used for measuring force, a pressure head of the press machine directly acts on a piston, the output pressure of the pressure head is F, a driving mechanism drives a piston dynamic sleeve to move upwards at a constant speed relative to the piston, and oil is supplemented into a hydraulic cavity through an oil inlet channel to ensure the stability of oil pressure in the hydraulic cavity. The stress of the piston dynamic sleeve is shown in fig. 2, F3 represents the friction force of the piston to the piston dynamic sleeve, F4 represents the acting force of hydraulic oil in a hydraulic cavity to the lower end face of the piston dynamic sleeve, F2 represents the friction force of a fixed part of a cylinder body to the periphery of the piston dynamic sleeve, F1 represents the acting force of a driving mechanism to the piston dynamic sleeve, the value of F1 can be directly read by a load cell, the value of F4 can be calculated by the indicating value of a pressure sensor and the surface area of the lower end face of the piston dynamic sleeve, and therefore F1 and F4 are both known values.
The acting force of the piston dynamic sleeve on the piston is the same as the acting force F3 in magnitude and opposite in direction, and the acting force of the piston dynamic sleeve on the piston is an interference force influencing the accurate measurement F.
The piston dynamic sleeve has an inner diameter D and an outer diameter D, the sizes of the F2 and the F3 are only related to the circumferential length of the friction contact surface, and F2/F3= pi D/pi D, so that F2= D/D x F3.
By F1+ F4= F2+ F3, the value of F3 can be directly calculated, namely the friction force of the dynamic piston sleeve to the piston can be calculated, the acting force applied to the lower end face of the piston can be conveniently calculated according to the effective contact area of the lower end face of the piston and hydraulic oil, and therefore the value of F can be accurately calculated.
Therefore, in the embodiment, the measuring precision is not influenced by the fine friction force, and the force of the force sensor on the piston can be accurately measured. In other embodiments of the utility model, when the piston is subjected to the pressure of the press machine, the driving mechanism can also drive the piston dynamic sleeve to move downwards at a constant speed, and at the moment, hydraulic oil in the hydraulic cavity is discharged through the oil outlet channel, so that the stability of the pressure in the hydraulic cavity is ensured; the electric push rod can be replaced by other driving mechanisms which can drive the piston dynamic sleeve to axially move, such as a hydraulic cylinder, a pneumatic cylinder and the like; when the device leaves a factory, the hydraulic cavity can be empty, and when the device is used by a consumer, hydraulic oil is automatically filled into the hydraulic cavity through the hydraulic pump; the guide bar may also be absent.
The embodiment of the hydraulic bearing device is shown in figures 1-3: the hydraulic support device embodiment differs from the force sensor embodiments described above in that the pressure sensor is not part of the hydraulic support device and the consumer self-configures the pressure sensor after purchasing the hydraulic support device.
Claims (6)
1. A force sensor comprising a piston and a cylinder assembly having a hydraulic chamber, and further comprising a pressure sensor for detecting a pressure of a fluid in the hydraulic chamber, characterized in that: the cylinder body assembly is matched with the piston in a guiding and moving mode in the axial direction of the piston, or the cylinder body assembly is provided with a piston dynamic sleeve matched with the piston in a guiding and moving mode in the axial direction of the piston, the force sensor comprises a driving mechanism for driving the cylinder body assembly or the piston dynamic sleeve to move along the axial direction of the piston, a force measuring sensor is arranged in series on a transmission path of the driving mechanism and the cylinder body assembly or the piston dynamic sleeve, and an oil duct used for oil inlet or oil outlet when the cylinder body assembly or the piston dynamic sleeve moves axially relative to the piston is arranged on the cylinder body assembly.
2. The force sensor of claim 1, wherein: the oil duct comprises an oil inlet oil duct and an oil outlet oil duct, a pressure release valve is arranged on the oil outlet oil duct, and a one-way oil inlet valve is arranged on the oil inlet oil duct.
3. The force sensor of claim 1 or 2, wherein: the cylinder body assembly is provided with a piston dynamic sleeve which is matched with the piston in a guiding and moving mode in the axial direction of the piston, the cylinder body assembly further comprises a cylinder body fixing part, and the driving mechanism is arranged between the cylinder body fixing part and the piston dynamic sleeve.
4. Hydraulic pressure bears device, includes piston and the cylinder body assembly that has hydraulic pressure chamber, its characterized in that: the hydraulic bearing device comprises a driving mechanism for driving the cylinder body assembly or the piston dynamic sleeve to move along the axial direction of the piston, a force measuring sensor is arranged on a transmission path of the driving mechanism and the cylinder body assembly or the piston dynamic sleeve in series, and an oil duct for oil inlet or oil outlet is arranged on the cylinder body assembly.
5. The hydraulic load bearing device of claim 4, wherein: the oil duct comprises an oil inlet oil duct and an oil outlet oil duct, a pressure release valve is arranged on the oil outlet oil duct, and a one-way oil inlet valve is arranged on the oil inlet oil duct.
6. Hydraulic carrying arrangement according to claim 4 or 5, characterized in that: the cylinder body assembly is provided with a piston dynamic sleeve which is matched with the piston in a guiding and moving mode in the axial direction of the piston, the cylinder body assembly further comprises a cylinder body fixing part, and the driving mechanism is arranged between the cylinder body fixing part and the piston dynamic sleeve.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020200343341 | 2020-01-08 | ||
| CN202020034334 | 2020-01-08 |
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| Publication Number | Publication Date |
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| CN215360057U true CN215360057U (en) | 2021-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120035057.0U Active CN215360057U (en) | 2020-01-08 | 2021-01-07 | Force sensor and hydraulic bearing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112781768A (en) * | 2020-01-08 | 2021-05-11 | 河南牛帕力学工程研究院 | Force sensor and hydraulic bearing device |
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2021
- 2021-01-07 CN CN202120035057.0U patent/CN215360057U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112781768A (en) * | 2020-01-08 | 2021-05-11 | 河南牛帕力学工程研究院 | Force sensor and hydraulic bearing device |
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