Detection system

Abstract

The invention discloses a detection system. The detection system comprises first equipment, second equipment, detection equipment and processing equipment, the first equipment has at least one electrical characteristic which can be detected by the detection equipment; the second equipment is roughly in a strip shape or a long strip shape and has different attributes in the length direction; when a portion of the second device is located within a specific area, the second device may influence an electrical characteristic of the first device by means of its properties; the specific area is a set of positions where the second equipment can influence the electrical characteristics of the first equipment by utilizing the attributes of the second equipment; when the second equipment moves along the length direction relative to the first equipment and a part of the second equipment is kept in a specific area, the electrical characteristic of the first equipment is changed along with the movement of the second equipment; the detection equipment is used for detecting electrical characteristics of first equipment and outputting a detection signal corresponding to the electrical characteristics of the first equipment; and the processing equipment is used for processing the detection signal to obtain the position of the first equipment relative to the length direction of the second equipment. According to the detection system, low-cost and high-precision detection of the position of the elevator car in the hoistway can be achieved.

Description

Technical Field

[0001] The present invention relates to a detection system, in particular to a detection system for detecting relative position / displacement. Background Art

[0002] The elevator car position is an important information for achieving safe operation of the elevator.

[0003] Document 1 (CN201880025246.0) proposes a moving distance measuring device, which comprises: a transceiver unit, which sends radio waves toward a reflection unit and receives reflected waves from the reflection unit, wherein the reflection unit includes a plurality of reflectors of the same shape arranged at equal intervals along the moving path of the moving body at a prescribed configuration interval, and the reflected waves received by the transceiver unit are composite waves of reflected waves from each of the reflectors within the transmission range of the transceiver unit; a phase detection unit, which detects the phase of the reflected wave received by the transceiver unit; a phase change calculation unit, which calculates the phase change according to the phase detected by the phase detection unit; and a moving distance calculation unit, which calculates the moving distance of the moving body according to the phase change calculated by the phase change calculation unit and the configuration interval of the reflector. Obviously, the moving distance measuring device can be used to detect the position of the elevator car in the shaft, but since the moving distance measuring device essentially uses the transmission time of the radio wave signal to calculate the transmission distance, and then obtains the position of the elevator car in the shaft according to the transmission distance, it has the following disadvantages:

[0004] 1) It is necessary to arrange multiple reflectors of the same shape at equal intervals in the hoistway at a prescribed arrangement interval, which has the disadvantages of complex installation and high cost;

[0005] 2) Since radio wave signals are transmitted very quickly, a small error in transmission time may lead to a large detection error.

[0006] Document 2 (CN200510091408.5) relates to an elevator device having at least one car and at least one device for detecting the position of the car, having a code mark pattern and a sensor device. The code mark pattern is arranged along the car running path, and the code mark pattern is composed of a plurality of code marks. The sensor device is arranged on the car and uses a sensor to scan the code mark without contact. The code mark is arranged on a single track and the sensor device includes at least two sensor groups spaced apart from each other perpendicular to the track of the code mark, so that the code mark can be read even when a side offset occurs between the sensor device and the code mark track. Document 3 (CN200510089578.X) proposes an elevator device having at least one car and at least one device for detecting the position of the car and a method for controlling the elevator device. The device has a code mark pattern, the code mark pattern is arranged along the car running path, the code mark pattern is composed of a plurality of code marks, the sensor device is arranged on the car and uses a sensor to scan the code mark without contact. The code mark is arranged on a single track and the sensor is arranged on a single track. The technical solutions of these two documents are to use sensors to directly read the code marks on the code mark graphics, which leads to very high requirements on the structure and process of the code mark graphics, and thus leads to high costs.

[0007] Therefore, how to achieve low-cost and high-precision detection of the position of the elevator car in the hoistway becomes a technical problem to be solved. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a detection system which can detect the position of an elevator car in a hoistway at low cost and with high precision.

[0009] In order to solve the above technical problems, the detection system disclosed in the present invention includes a first device, a second device, a detection device and a processing device;

[0010] The first device has at least one electrical characteristic that can be detected by the detection device;

[0011] The second device is substantially in the shape of a strip or a long strip and has different properties in the length direction; when part of the second device is located in a specific area, the second device can affect the electrical characteristics of the first device by means of its properties; the specific area is a collection of positions where the second device can affect the electrical characteristics of the first device by means of its properties;

[0012] When the second device moves relative to the first device in the length direction and a portion of the second device remains within a specific area, an electrical characteristic of the first device changes with the movement of the second device;

[0013] The detection device is used to detect the electrical characteristics of the first device and output a detection signal corresponding to the electrical characteristics of the first device;

[0014] The processing device is used to process the detection signal to obtain the position of the first device relative to the second device in the length direction.

[0015] Preferably, the property of the second device is a chemical property and / or a physical property of a part or all of the material of the second device.

[0016] Preferably, the chemical characteristics include a material composition of the second device, the material composition of the second device is different along its length, and the difference in material composition leads to different effects on the electrical characteristics of the first device.

[0017] Preferably, the material composition of the first point on the second device is a one-to-one function with the position of the first point in the length direction thereof as a variable.

[0018] Preferably, the second device is a series of identical components fixed at different intervals in the vertical direction of the hoistway, or different components fixed at the same interval, or different components fixed at different intervals.

[0019] Preferably, the second device comprises two parts, the first part is an object which is roughly in the shape of a band or strip along the length direction, and the second part is the same component unit fixed at different intervals along the length direction of the first part, or different component units fixed at the same interval distance, or different component units fixed at different interval distances, and the component units are fixed on the first part.

[0020] Preferably, the physical property includes a shape of the second device, the shape of the second device is different in its length direction, and the difference in shape leads to different effects on the electrical property of the first device.

[0021] Preferably, the shape comprises at least one of the width, thickness, shape and / or position of the hole of the second device in the length direction.

[0022] Preferably, the first device generates a field of action covering the specific area, and when the second device or a part thereof is located in the field of action, the second device or a part thereof uses its properties to exert influence on the field of action; the detection device detects the electrical characteristics as the physical manifestation of the field of action of the first device, and outputs a detection signal reflecting the field of action.

[0023] Preferably, the detection device detects the action field by detecting the intensity or distribution of the action field.

[0024] Preferably, the first device comprises: a ring, a coil and a power supply, the coil is wound around the ring axially, the power supply is connected to the coil to generate current in the coil, thereby generating a magnetic field inside and around the ring; the action field is a magnetic field; the second device comprises ferromagnetic materials having different distributions in its length direction; the electrical properties are the ferromagnetic properties of the ferromagnetic material affecting the magnetic field generated by the coil, and the specific area is the area that can be covered by the magnetic field inside or outside the ring; when the second device located in the specific area moves relative to the first device in its length direction, the change in the ferromagnetic properties of the second device located in the magnetic field causes the magnetic field to change accordingly; the detection device detects the magnetic field by detecting the magnetic induction intensity of the magnetic field or the magnetic flux within a given range.

[0025] Preferably, the first device comprises: a ring, a coil and a power supply, the coil is wound around the ring axially, the power supply is connected to the coil to generate current in the coil, thereby generating a magnetic field inside and around the ring; the action field is a magnetic field; the second device comprises ferromagnetic materials having different distributions in its length direction; the electrical properties are the ferromagnetic properties of the ferromagnetic material affecting the magnetic field generated by the coil, and the specific area is the area that can be covered by the magnetic field inside or outside the ring; when the second device located in the specific area moves relative to the first device in its length direction, the change in the ferromagnetic properties of the second device located in the magnetic field causes the magnetic field to change accordingly, and the change in the magnetic field in turn causes the change in the inductance value that inhibits the change in current in the coil; the detection device implements the detection by detecting the inductance value.

[0026] Preferably, the second device is substantially symmetrical about the center of the ring axis.

[0027] Preferably, when the specific area is within a circular ring, a difference obtained by subtracting a maximum dimension of the second device in a cross section perpendicular to the length direction from a diameter of the circular ring is greater than a first threshold.

[0028] Preferably, the first device further comprises a guide device located near both ends of the ring, and the guide device guides the second device to ensure that the second device does not contact the ring.

[0029] Preferably, the first device is a capacitor comprising two capacitor plates; the specific area and the action field are the areas located between the two capacitor plates; the second device comprises a material having a dielectric constant different from that of air and having a different distribution in its length direction; the electrical characteristic is the dielectric constant of the material different from that of air; when the second device located in the specific area moves relative to the first device in its length direction, the material having a dielectric constant different from that of air in the second device located in the specific area will cause the capacitance value of the first device to change; and the detection device performs detection by detecting the capacitance value of the first device.

[0030] Preferably, the distance between the two capacitor plates of the first device is d, and the angle α between the inner sides of the two capacitor plates satisfies: 10°≤α≤180°.

[0031] Preferably, the second device is approximately located on the bisector of the angle between the two capacitor plates of the first device, and the distance between the second device and the two capacitor plates of the first device is not less than a second threshold.

[0032] Preferably, the first device further comprises a guiding device located near the two capacitor plates of the first device, and the guiding device guides the second device to ensure that the distance between the second device and the two capacitor plates of the first device is not less than a second threshold.

[0033] Preferably, the processing unit determines the lengthwise position of the first device relative to the second device according to a pre-established correspondence between the lengthwise position of the first device relative to the second device and a detection signal of the detection device.

[0034] Preferably, the first device also includes a position detection device; the position detection device is used to detect the relative position of the second device relative to the first device and output a position signal; the processing device determines the lengthwise position of the first device relative to the second device based on the detection signal of the detection device and the position signal output by the position detection device.

[0035] Preferably, the processing device determines the position of the first device relative to the length direction of the second device based on a signal-position relationship, and the signal-position relationship is a pre-established correspondence between the detection signal of the detection device, the position signal output by the position detection device, and the position of the first device relative to the length direction of the second device.

[0036] Preferably, the position signal is a minimum distance between projections of the first device and the second device in a first plane perpendicular to a length direction of the second device.

[0037] Beneficial technical effects

[0038] The detection system of the present invention can realize low-cost and high-precision detection of the position of the elevator car in the hoistway. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of the detection system of Example 1. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] Example 1

[0042] like Figure 1 As shown, the detection system of this embodiment includes a first device, a second device, a detection device and a processing device;

[0043] The first device has at least one electrical characteristic that can be detected by the detection device;

[0044] The second device is substantially in the shape of a strip or a long strip and has different properties in the length direction; when part of the second device is located in a specific area, the second device can affect the electrical characteristics of the first device by means of its properties; the specific area is a collection of positions where the second device can affect the electrical characteristics of the first device by means of its properties;

[0045] When the second device moves relative to the first device in the length direction and a portion of the second device remains within a specific area, an electrical characteristic of the first device changes with the movement of the second device;

[0046] The detection device is used to detect the electrical characteristics of the first device and output a detection signal corresponding to the electrical characteristics of the first device;

[0047] The processing device is used to process the detection signal to obtain the position of the first device relative to the second device in the length direction.

[0048] Example 2

[0049] This embodiment further describes the second device based on the embodiment 1.

[0050] The property of the second device is the chemical property and / or physical property of a part or all of the material of the second device.

[0051] The chemical property includes a material composition of the second device, the material composition of the second device is different along its length, and the different material compositions cause different effects on the electrical properties of the first device. The material composition of a first point on the second device is a one-to-one function of the position of the first point along its length.

[0052] For physical properties:

[0053] The second device is a series of identical components fixed at different intervals in the vertical direction of the hoistway, or different components fixed at the same interval, or different components fixed at different intervals.

[0054] The second device includes two parts, the first part is an object that is roughly strip-shaped or long along the length direction, and the second part is the same component units fixed at different intervals along the length direction of the first part, or different component units fixed at the same interval distance, or different component units fixed at different interval distances, and the component units are fixed on the first part.

[0055] The physical characteristics include a shape of the second device, the shape of the second device is different in a length direction thereof, and the difference in shape causes a different effect on the electrical characteristics of the first device.

[0056] The shape includes at least one of the width, thickness, shape and / or position of the hole of the second device in the length direction.

[0057] Example 3

[0058] This embodiment is further described based on the above embodiment.

[0059] The first device generates an action field covering the specific area, and when the second device or a part thereof is located in the action field, the second device or a part thereof exerts an influence on the action field using its properties;

[0060] The detection device detects electrical characteristics as a physical manifestation of the applied field of the first device, and outputs a detection signal reflecting the applied field.

[0061] The detection device detects the action field by detecting the intensity or distribution of the action field.

[0062] Example 4

[0063] This embodiment further illustrates the processing unit based on the above-mentioned embodiment.

[0064] The processing unit determines the position of the first device relative to the second device in the length direction according to a pre-established correspondence between the position of the first device relative to the second device in the length direction and the detection signal of the detection device.

[0065] Example 5

[0066] This embodiment further illustrates the first device based on Embodiment 1 to Embodiment 3.

[0067] The first device further comprises a position detection device; the position detection device is used to detect the relative position of the second device relative to the first device and output a position signal;

[0068] The processing device determines the position of the first device relative to the second device in the length direction according to the detection signal of the detection device and the position signal output by the position detection device.

[0069] The processing device determines the position of the first device relative to the second device in the length direction based on the signal-position relationship, and the signal-position relationship is a pre-established correspondence between the detection signal of the detection device, the position signal output by the position detection device, and the position of the first device relative to the second device in the length direction.

[0070] Preferably, the position signal is a minimum distance between projections of the first device and the second device in a first plane perpendicular to a length direction of the second device.

[0071] Example 6

[0072] This embodiment provides a specific implementation of the first detection system based on the above embodiments.

[0073] The first device comprises: a ring, a coil and a power source, wherein the coil is wound around the ring along the axial direction of the ring, and the power source is connected to the coil to generate a current in the coil, thereby generating a magnetic field in and around the ring; the action field is a magnetic field;

[0074] The second device includes ferromagnetic materials having different distributions in the length direction thereof; the electrical characteristics are the ferromagnetic characteristics of the ferromagnetic material affecting the magnetic field generated by the coil, and the area that can be covered by the magnetic field inside or outside the specific area ring;

[0075] When the second device located in the specific area moves relative to the first device in the length direction thereof, a change in the ferromagnetic property of the second device located in the magnetic field causes a corresponding change in the magnetic field;

[0076] The detection device detects the magnetic field by detecting the magnetic induction intensity of the magnetic field or the magnetic flux within a given range.

[0077] The working principle of the iron core coil is to use the ferromagnetic properties of the iron core. The iron core coil is a common inductor, which consists of a coil and an iron core. The iron core is usually a toroidal or linear core made of ferromagnetic material, and the coil is wrapped around the core.

[0078] The working principle of the iron core coil is to use the ferromagnetic properties of the iron core to enhance the induction ability of the coil. When the current passes through the coil, it will generate a magnetic field in the iron core, and this magnetic field will return to the coil to generate an electromagnetic induction. Due to the existence of the iron core, this electromagnetic induction is stronger than the induction generated in the air.

[0079] Example 7

[0080] This embodiment provides a specific implementation of the second detection system based on the above-mentioned embodiments 1 to 5.

[0081] The first device comprises: a ring, a coil and a power source, wherein the coil is wound around the ring along the axial direction of the ring, and the power source is connected to the coil to generate a current in the coil, thereby generating a magnetic field in and around the ring; the action field is a magnetic field;

[0082] The second device includes ferromagnetic materials having different distributions in the length direction thereof; the electrical characteristics are the ferromagnetic characteristics of the ferromagnetic material affecting the magnetic field generated by the coil, and the area that can be covered by the magnetic field inside or outside the specific area ring;

[0083] When the second device located in the specific area moves relative to the first device in the length direction thereof, the change of the ferromagnetic property of the second device located in the magnetic field causes the magnetic field to change accordingly, and the change of the magnetic field in turn causes the change of the inductance value that suppresses the change of the current in the coil;

[0084] The detection device performs detection by detecting the inductance value.

[0085] Example 8

[0086] This embodiment is further described on the basis of Embodiment 6 and Embodiment 7.

[0087] The second device is substantially symmetrical with respect to the center of the ring axis.

[0088] When the specific area is within a circular ring, a difference obtained by subtracting a maximum dimension of the second device in a cross section perpendicular to the length direction from a diameter of the circular ring is greater than a first threshold.

[0089] The first device also includes a guide device located near both ends of the ring, which guides the second device to ensure that the second device does not contact the ring.

[0090] Example 9

[0091] This embodiment provides a specific implementation of the third detection system based on the above-mentioned embodiments 1 to 5.

[0092] The first device is a capacitor comprising two capacitor plates; the specific area and the action field are areas located between the two capacitor plates;

[0093] The second device includes a material having a dielectric constant different from air and having a different distribution along its length; the electrical characteristic is the dielectric constant of the material different from air;

[0094] When the second device located in the specific area moves relative to the first device in the length direction thereof, the material of the second device located in the specific area with a dielectric constant different from that of air will cause the capacitance value of the first device to change;

[0095] The detection device performs detection by detecting a capacitance value of the first device.

[0096] Preferably, the distance between the two capacitor plates of the first device is d, and the angle α between the inner sides of the two capacitor plates satisfies: 10°≤α≤180°.

[0097] Preferably, the second device is approximately located on the bisector of the angle between the two capacitor plates of the first device, and the distance between the second device and the two capacitor plates of the first device is less than the second threshold.

[0098] Preferably, the first device further comprises a guiding device located near the two capacitor plates of the first device, and the guiding device guides the second device to ensure that the distance between the second device and the two capacitor plates of the first device is less than a second threshold.

[0099] The present invention has been described in detail above through specific implementation modes and embodiments, but these do not constitute limitations of the present invention. Without departing from the principles of the present invention, those skilled in the art may also make many variations and improvements, which should also be regarded as the protection scope of the present invention.

Claims

1. A detection system, characterized in that: comprising a first device, a second device, a detection device and a processing device; The first device has at least one electrical characteristic that can be detected by the detection device; The second device is substantially in the shape of a strip or a long strip and has different properties in the length direction; when part of the second device is located in a specific area, the second device can affect the electrical characteristics of the first device by means of its properties; the specific area is a collection of positions where the second device can affect the electrical characteristics of the first device by means of its properties; When the second device moves relative to the first device in the length direction and a portion of the second device remains within a specific area, an electrical characteristic of the first device changes with the movement of the second device; The detection device is used to detect the electrical characteristics of the first device and output a detection signal corresponding to the electrical characteristics of the first device; The processing device is used to process the detection signal to obtain the position of the first device relative to the second device in the length direction.

2. The detection system according to claim 1, characterized in that: The property of the second device is the chemical property and / or physical property of a part or all of the material of the second device.

3. The detection system according to claim 2, characterized in that: The chemical characteristics include a material composition of the second device, the material composition of the second device being different along its length, and the difference in material composition causing a different effect on the electrical characteristics of the first device.

4. The detection system according to claim 3, characterized in that: The material composition of the first point on the second device is a one-to-one function with the position of the first point in the length direction of the second device as a variable.

5. The detection system according to claim 2, characterized in that: The second device is a series of identical components fixed at different intervals in the vertical direction of the hoistway, or different components fixed at the same interval, or different components fixed at different intervals.

6. The detection system according to claim 2, characterized in that: The second device includes two parts, the first part is an object that is roughly strip-shaped or long along the length direction, and the second part is the same component units fixed at different intervals along the length direction of the first part, or different component units fixed at the same interval distance, or different component units fixed at different interval distances, and the component units are fixed on the first part.

7. The detection system according to claim 2, characterized in that: The physical characteristics include a shape of the second device, the shape of the second device is different in a length direction thereof, and the difference in shape causes a different effect on the electrical characteristics of the first device.

8. The detection system according to claim 7, characterized in that: The shape includes at least one of the width, thickness, shape and / or position of the hole of the second device in the length direction.

9. The detection system according to claim 1, characterized in that: The first device generates an action field covering the specific area, and when the second device or a part thereof is located in the action field, the second device or a part thereof exerts an influence on the action field using its properties; The detection device detects electrical characteristics as a physical manifestation of the applied field of the first device, and outputs a detection signal reflecting the applied field.

10. The detection system according to claim 9, characterized in that: The detection device detects the action field by detecting the intensity or distribution of the action field.

11. The detection system according to claim 9, characterized in that: The first device comprises: a ring, a coil and a power source, wherein the coil is wound around the ring along the axial direction of the ring, and the power source is connected to the coil to generate a current in the coil, thereby generating a magnetic field in and around the ring; the action field is a magnetic field; The second device includes ferromagnetic materials having different distributions in the length direction thereof; the electrical property is the ferromagnetic property of the ferromagnetic material affecting the magnetic field generated by the coil, and the specific area is the area that can be covered by the magnetic field inside or outside the ring; When the second device located in the specific area moves relative to the first device in the length direction thereof, a change in the ferromagnetic property of the second device located in the magnetic field causes a corresponding change in the magnetic field; The detection device detects the magnetic field by detecting the magnetic induction intensity of the magnetic field or the magnetic flux within a given range.

12. The detection system according to claim 9, characterized in that: The first device comprises: a ring, a coil and a power source, wherein the coil is wound around the ring along the axial direction of the ring, and the power source is connected to the coil to generate a current in the coil, thereby generating a magnetic field in and around the ring; the action field is a magnetic field; The second device includes ferromagnetic materials having different distributions in the length direction thereof; the electrical property is the ferromagnetic property of the ferromagnetic material affecting the magnetic field generated by the coil, and the specific area is the area that can be covered by the magnetic field inside or outside the ring; When the second device located in the specific area moves relative to the first device in the length direction thereof, the change of the ferromagnetic property of the second device located in the magnetic field causes the magnetic field to change accordingly, and the change of the magnetic field in turn causes the change of the inductance value that suppresses the change of the current in the coil; The detection device performs detection by detecting the inductance value.

13. The detection system according to claim 11 or 12, characterized in that: The second device is substantially symmetrical with respect to the center of the ring axis.

14. The detection system according to claim 11 or 12, characterized in that: When the specific area is within a circular ring, a difference obtained by subtracting a maximum dimension of the second device in a cross section perpendicular to the length direction from a diameter of the circular ring is greater than a first threshold.

15. The detection system according to claim 11 or 12, characterized in that: The first device also includes a guide device located near both ends of the ring, which guides the second device to ensure that the second device does not contact the ring.

16. The detection system according to claim 9, characterized in that: The first device is a capacitor comprising two capacitor plates; the specific area and the action field are areas located between the two capacitor plates; The second device includes a material having a dielectric constant different from air and having a different distribution along its length; the electrical characteristic is the dielectric constant of the material different from air; When the second device located in the specific area moves relative to the first device in the length direction thereof, the material of the second device located in the specific area with a dielectric constant different from that of air will cause the capacitance value of the first device to change; The detection device performs detection by detecting a capacitance value of the first device.

17. The detection system according to claim 16, characterized in that: The distance between the two capacitor plates of the first device is d, and the angle α between the inner sides of the two capacitor plates satisfies: 10°≤α≤180°.

18. The detection system according to claim 17, characterized in that: The second device is approximately located on the bisector of the angle between the two capacitor plates of the first device, and the distance between the second device and the two capacitor plates of the first device is not less than a second threshold.

19. The detection system according to any one of claims 16 to 18, characterized in that: The first device further comprises a guide device located near the two capacitor plates of the first device, and the guide device guides the second device to ensure that the distance between the second device and the two capacitor plates of the first device is not less than a second threshold.

20. The detection system according to claim 1, characterized in that: The processing unit determines the position of the first device relative to the second device in the length direction according to a pre-established correspondence between the position of the first device relative to the second device in the length direction and the detection signal of the detection device.

21. The detection system according to claim 1, characterized in that: The first device also includes a position detection device; The position detection device is used to detect the relative position of the second device with respect to the first device and output a position signal; The processing device determines the position of the first device relative to the second device in the length direction according to the detection signal of the detection device and the position signal output by the position detection device.

22. The detection system according to claim 21, characterized in that: The processing device determines the position of the first device relative to the second device in the length direction based on the signal-position relationship, and the signal-position relationship is a pre-established correspondence between the detection signal of the detection device, the position signal output by the position detection device, and the position of the first device relative to the second device in the length direction.

23. The detection system according to claim 21, characterized in that: The position signal is a minimum distance between projections of the first device and the second device in a first plane perpendicular to a length direction of the second device.

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