Non-contact stroke sensor

Abstract

The utility model provides a non-contact stroke sensor, which is mounted in a hydraulic cylinder, detects oil in the hydraulic cylinder through a liquid passing hole formed in the hydraulic cylinder, and comprises a shell, a base and a detection plug, the detection plug is arranged on the whole base-shaped sensor through the shell; an insertion hole is formed in the hydraulic cylinder, a liquid passing hole communicated with the oil cavity is formed in the insertion hole, and the sensor is integrally installed in the insertion hole; the radar element arranged on the detection plug, the lens arranged on the base and the liquid passing hole correspond to each other, so that the radar element detects the position of the piston in the oil cavity through the lens. According to the utility model, the problems of inconvenient dismounting, low precision, short measuring range and the like of the stroke sensor for the mining hydraulic cylinder at the present stage are solved.

Description

Technical Field

[0001] The utility model belongs to the field of sensors, and in particular relates to a non-contact stroke sensor. Background Art

[0002] A mining hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and makes a linear reciprocating motion (or swinging motion). The hydraulic cylinder drives the piston to move linearly along the inner wall of the hydraulic cylinder under the action of the pressure difference between the rod chamber and the rodless chamber. During the operation of the hydraulic cylinder, it is necessary to monitor the position of the piston in real time to obtain the working state of the hydraulic cylinder. At present, the stroke sensors used in mining hydraulic cylinders have problems such as inconvenient disassembly and assembly, low accuracy, and short range. Content of the Utility Model

[0003] In view of this, the utility model aims to propose a non-contact stroke sensor to solve the above problems.

[0004] To achieve the above object, the technical solution of the utility model is realized as follows:

[0005] A non-contact stroke sensor is installed in a hydraulic cylinder and detects the hydraulic oil in the hydraulic cylinder through a liquid passing hole provided in the hydraulic cylinder. It includes a housing, a base, and a detection plug; the detection plug is installed on the base through the housing to form the overall sensor;

[0006] The hydraulic cylinder is provided with a jack, and a liquid passing hole communicating with the oil cavity is provided in the jack. The overall sensor is installed in the jack;

[0007] The radar element provided on the detection plug, the lens provided on the base, and the liquid passing hole correspond to each other, so that the radar element can detect the position of the piston in the oil cavity through the lens.

[0008] Further, the base is of a shell structure. The first end of the base is open for the housing to be inserted. The second end of the base is provided with a positioning post, and the positioning post corresponds to a positioning hole provided at the bottom of the jack of the hydraulic cylinder to limit the base entering the jack; an air passing hole is also provided at the second end of the base;

[0009] A groove is provided on the circumferential surface of the base, and a lens communicating with the inside and outside is provided on the groove.

[0010] Further, two symmetrically arranged limiting platforms are provided in the inner cavity of the base, and the lens is arranged in the area between the two limiting platforms.

[0011] Further, a sealing ring is also provided on the circumferential outer surface of the base.

[0012] Further, the outer contour of the housing fits with the inner cavity of the base, and the limiting platform is used to limit the housing;

[0013] The inner cavity of the housing is used for mounting to a detection plug; a through hole is provided on the housing, and the position of the through hole corresponds to that of the lens.

[0014] Furthermore, a circuit board slot is provided at the bottom of the inner cavity of the housing, and an inner stepped structure is also provided in the inner cavity of the housing. A limit can be formed between the inner stepped structure and the detection plug;

[0015] An outer stepped structure is provided on the outer surface of the housing, and the outer stepped structure abuts against the end face of the base to form a fit.

[0016] Furthermore, the detection plug includes a radar circuit board and a socket. The radar circuit board is mounted on the socket to form an integral body. The detection plug is inserted into the inner cavity of the housing, the radar circuit board enters the circuit board slot, and the socket forms a limit with the stepped structure in the inner cavity of the housing;

[0017] Radar components are provided on the circuit board, and the radar components correspond to the through holes;

[0018] A quick-release joint is provided on the outer side of the socket.

[0019] Furthermore, a sealing ring is provided between the socket and the inner cavity of the housing, and a sealing ring is also provided between the housing and the jack.

[0020] Furthermore, an inner ring groove is provided on the inner surface of the housing, and the inner ring groove corresponds to the end face of the socket. An inner snap ring is arranged between the inner ring groove and the socket end face, and the fixation between the detection plug and the housing can be realized;

[0021] An outer ring groove is provided on the inner surface of the jack, and the outer ring groove corresponds to the end face of the housing. By arranging an outer snap ring between the outer ring groove and the housing, the fixation between the housing and the jack can be realized.

[0022] Furthermore, the inner snap ring and the outer snap ring have the same structure and are both horseshoe-shaped.

[0023] Compared with the prior art, the non-contact stroke sensor of the present utility model has the following advantages:

[0024] For the non-contact stroke sensor of the present utility model, the sensor is made into a split type. First, the radar lens is installed in the hydraulic cylinder. When problems occur in the subsequent transceiver assembly and need to be replaced, there is no need to remove the radar lens, avoiding contact with the liquid and reducing the replacement time. At the same time, both the radar lens and the transceiver assembly are outside the hydraulic cylinder, making the replacement more convenient. Through a special lens design, the electromagnetic wave gain is increased, ensuring the linearity of the electromagnetic wave propagation, enabling the millimeter-wave signal to propagate farther, and at the same time ensuring the signal intensity of the reflected wave. Through the snap ring design, the assembly is simpler, avoiding the problem of easy loosening of the threaded connection. Description of the Drawings

[0025] The accompanying drawings, which form a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0026] Figure 1 Schematic cross-sectional view of a non-contact stroke sensor according to an embodiment of the present utility model installed on a hydraulic cylinder;

[0027] Figure 2 As described in the embodiment of the present utility model Figure 1 Enlarged schematic view marked A;

[0028] Figure 3 Schematic diagram of the base as described in the embodiment of the present utility model Figure 1 ;

[0029] Figure 4 Schematic diagram of the base as described in the embodiment of the present utility model Figure 2 ;

[0030] Figure 5 Schematic diagram of the inner snap ring as described in the embodiment of the present utility model.

[0031] Description of reference numerals:

[0032] 1, hydraulic cylinder; 11, jack; 12, liquid passage hole; 13, piston; 14, outer ring groove; 21, housing; 211, through hole; 212, circuit board slot; 213, inner step structure; 214, outer step mechanism; 215, inner ring groove; 22, base; 221, positioning post; 222, air passage hole; 223, lens; 224, limiting platform; 23, detection plug; 231, radar circuit board; 232, socket; 233, radar element; 234, quick-release joint; 3, inner snap ring; 4, outer snap ring. Detailed implementation manners

[0033] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0035] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

[0036] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0037] A non-contact stroke sensor is installed in a hydraulic cylinder 1. Through a liquid passing hole 12 provided in the hydraulic cylinder 1, the hydraulic oil in the hydraulic cylinder 1 is detected, as Figures 1 - 5 shown, it includes a housing 21, a base 22, and a detection plug 23; the detection plug 23 is installed on the base 22 through the housing 21 to form the overall sensor;

[0038] The hydraulic cylinder 1 is provided with a jack 11, and a liquid passing hole 12 communicating with the oil cavity is provided in the jack 11. The overall sensor is installed in the jack 11;

[0039] The radar element 233 provided on the detection plug 23, the lens 223 provided on the base 22, and the liquid passing hole 12 correspond to each other, so that the radar element 233 can detect the position of the piston 13 in the oil cavity through the lens 223.

[0040] Preferably, the base 22 is of a housing structure with an opening at the first end for the insertion of the outer shell 21. At the second end of the base 22, there is a positioning post 221 which corresponds to the positioning hole provided at the bottom of the insertion hole 11 of the hydraulic cylinder 1 for limiting the base 22 entering the insertion hole 11. At the second end of the base 22, there is also a vent hole 222, the purpose of which is to facilitate the installation of the base 22.

[0041] On the circumferential surface of the base 22, there is a groove, and on the groove, there is a lens 223 communicating with the inside and outside. The groove provides an installation platform for the lens 223 to enable the lens 223 to work smoothly.

[0042] Preferably, there are two symmetrically arranged limiting platforms 224 in the inner cavity of the base 22, and the lens 223 is arranged in the area between the two limiting platforms 224; and the lens 223 is not higher than the limiting platforms 224. The limiting platforms 224 provide protection for the lens 223 to avoid damage caused by the contact of the lens 223 when the outer shell 21 is inserted. At the same time, they also limit the outer shell 21 to prevent rotation.

[0043] Preferably, there is also a sealing ring on the circumferential outer surface of the base 22 to improve the sealing performance.

[0044] Preferably, the outer contour of the outer shell 21 fits the inner cavity of the base 22, and the limiting platform 224 is used to limit the outer shell 21.

[0045] The inner cavity of the outer shell 21 is used to install the detection plug 23; there is a through hole 211 on the outer shell 21, and the position of the through hole 211 corresponds to that of the lens 223.

[0046] Preferably, there is a circuit board slot 212 at the bottom of the inner cavity of the outer shell 21, and there is also an inner stepped structure 213 in the inner cavity of the outer shell 21. A limit can be formed between the inner stepped structure 213 and the detection plug 23; there is an outer stepped structure on the outer surface of the outer shell 21, and the outer stepped structure abuts against the end face of the base 22 to form a fit, as Figure 2 shown, with a clever design and layer-by-layer cooperation to improve the integrity.

[0047] Preferably, the detection plug 23 includes a radar circuit board 231 and a socket 232. The radar circuit board 231 is installed on the socket 232 to form an integral body. The detection plug 23 is inserted into the inner cavity of the outer shell 21, and the radar circuit board 231 enters the circuit board slot 212. The socket 232 forms a limit with the stepped structure in the inner cavity of the outer shell 21; there are radar components 233 on the circuit board, and the radar components 233 correspond to the through holes 211; the radar components 233 are the parts for working, emitting waves and then receiving waves to judge the position of the piston 13; there is a quick-release joint 234 on the outside of the socket 232 for facilitating electrical connection.

[0048] Preferably, a sealing ring is provided between the socket 232 and the inner cavity of the housing 21, and a sealing ring is also provided between the housing 21 and the jack 11. The sealing ring is used to ensure the sealing performance.

[0049] Preferably, an inner ring groove 215 is provided on the inner surface of the housing 21. The inner ring groove 215 corresponds to the end face of the socket 232. An inner snap ring 3 is arranged between the inner ring groove 215 and the end face of the socket 232, which can realize the fixation between the detection plug 23 and the housing 21. An outer ring groove 14 is provided on the inner surface of the jack 11. The outer ring groove 14 corresponds to the end face of the housing 21. By arranging an outer snap ring 4 between the outer ring groove 14 and the housing 21, the fixation between the housing 21 and the jack 11 can be realized.

[0050] Preferably, the inner snap ring 3 and the outer snap ring 4 have the same structure and are both horseshoe-shaped. Such a design is to facilitate deformation and convenient to be inserted into the inner snap ring 3 or the outer snap ring 4.

[0051] Applying the Fermat principle of electromagnetic wave propagation and Snell's law of refraction, a hyperbolic focusing lens 223 is designed. When the millimeter-wave radar passes through the lens 223, a focusing effect is generated, ensuring the linearity of wave propagation, thereby increasing the propagation distance of the millimeter wave and improving the range of the travel sensor. The feed is at one focus or focal plane of the lens 223. After being refracted by the lens 223, the beam is focused into a highly directive beam, thus greatly increasing the gain of the antenna and reducing the side lobes and back lobes of the antenna. The millimeter-wave lens 223 is usually composed of dielectric materials transparent to electromagnetic waves such as polytetrafluoroethylene, polyimide, and PEEK. The electromagnetic wave is transmitted through the dielectric lens 223, causing the insertion phase delay of the electromagnetic wave, and then realizing the transformation of the radiator wavefront as required.

[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A non-contact stroke sensor is installed in a hydraulic cylinder and detects the oil in the hydraulic cylinder through a liquid hole provided in the hydraulic cylinder, and is characterized by: It includes a housing, a base and a detection plug; the detection plug is installed to the base-shaped sensor through the housing; The hydraulic cylinder is provided with a socket, the socket is provided with a liquid hole communicating with the oil chamber, and the sensor is integrally installed in the socket; The radar element arranged on the detection plug, the lens arranged on the base and the liquid passage hole correspond to each other, so that the radar element can detect the position of the piston in the oil cavity through the lens.

2. A non-contact travel sensor according to claim 1, characterized in that: The base is a shell structure, the first end of the base is open for the shell to be inserted, the second end of the base is provided with a positioning column, the positioning column corresponds to the positioning hole provided at the bottom of the hydraulic cylinder jack, and is used to limit the base entering the jack; the second end of the base is also provided with an air hole; A groove is arranged on the circumferential surface of the base, and a lens connecting the inside and the outside is arranged on the groove.

3. A non-contact travel sensor according to claim 2, characterized in that: The inner cavity of the base is provided with two symmetrically arranged limit platforms, and the lens is arranged in the area between the two limit platforms.

4. A non-contact travel sensor according to claim 2, characterized in that: A sealing ring is also provided on the circumferential outer surface of the base.

5. The non-contact travel sensor according to claim 3, characterized in that: The outer contour of the shell matches the inner cavity of the base, and the limiting platform is used to limit the shell; The inner cavity of the shell is used for mounting the detection plug; the shell is provided with a through hole, and the through hole corresponds to the position of the lens.

6. A non-contact travel sensor according to claim 5, characterized in that: A circuit board slot is provided at the bottom of the inner cavity of the shell, and an inner step structure is also provided in the inner cavity of the shell, and a limit can be formed between the inner step structure and the detection plug; The outer surface of the shell is provided with an outer step structure, and the outer step structure abuts against the end surface of the base to form a match.

7. A non-contact travel sensor according to claim 6, characterized in that: The detection plug includes a radar circuit board and a socket. The radar circuit board is installed on the socket to form a whole. The detection plug is inserted into the inner cavity of the shell, and the radar circuit board enters the circuit board slot. The step structure between the socket and the inner cavity of the shell forms a limit. The circuit board is provided with a radar element, and the radar element corresponds to the through hole; A quick-release connector is provided on the outside of the socket.

8. The non-contact travel sensor according to claim 7, characterized in that: A sealing ring is arranged between the socket and the inner cavity of the shell, and a sealing ring is also arranged between the shell and the plug hole.

9. The non-contact travel sensor according to claim 7, characterized in that: The inner surface of the shell is provided with an inner ring groove, the inner ring groove corresponds to the end surface of the socket, and an inner clamping ring is provided between the inner ring groove and the end surface of the socket, so as to realize the fixation between the detection plug and the shell; The inner surface of the jack is provided with an outer ring groove, and the outer ring groove corresponds to the end surface of the shell. By arranging an outer clamping ring between the outer ring groove and the shell, the fixation between the shell and the jack can be achieved.

10. The non-contact travel sensor according to claim 9, characterized in that: The inner and outer snap rings have the same structure, both in the shape of a horseshoe.

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