Sensor probe and sensor

Abstract

The embodiment of the utility model provides a sensor probe and a sensor. The sensor probe comprises a framework body, a hollow sensitive coil and a high-frequency coaxial cable, the framework body is in a stepped column shape; a first conductive circular ring sheet is sleeved at the step of the stepped column; a second conductive circular ring sheet is arranged at the small end of the framework body; the hollow sensitive coil is fixed at the large head end of the framework body, and two ends of the hollow sensitive coil are electrically connected with the first conductive circular ring sheet and the second conductive circular ring sheet in a one-to-one correspondence manner through connecting wires; a conductor of the high-frequency coaxial cable is conductively connected with the second conductive ring sheet; a shielding layer of the high-frequency coaxial cable is conductively connected with the first conductive ring sheet. According to the utility model, the framework body is arranged to be of the stepped columnar structure, the two conductive circular ring sheets are adopted as a connecting structure, and the hollow sensitive coil is connected with the high-frequency coaxial cable, so that the skill requirement and the proficiency degree on operators can be greatly reduced, the consistency of the sensor probe is greatly improved, and the yield of sensor probe manufacturing is greatly improved.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a sensor probe and a sensor. Background Art

[0002] The existing inductive displacement / speed sensor probe is composed of a hollow sensitive coil, a non-metallic coil frame, a non-metallic coil shell, a probe metal support rod, and a radio frequency coaxial cable. In the prior art, the production of sensor probes requires complex assembly and packaging, and because the product size is too small, it can only be produced manually, resulting in many uncontrollable human factors in the production process, which easily causes product scrapping. There are problems such as low product consistency, low production quality, high production cost, and high dependence on the skills and proficiency of operators in mass production. Utility Model Content

[0003] The utility model of the present application aims to provide a sensor probe and a sensor, which can reduce the influence of human factors on product production by improving the structure of the sensor probe, thereby improving production quality and reducing production costs.

[0004] The embodiment of the present application provides a sensor probe, which includes a skeleton, a hollow sensitive coil and a high-frequency coaxial cable; wherein,

[0005] The skeleton body comprises a first cylinder and a second cylinder which are coaxially arranged, wherein the diameter of the first cylinder is larger than the diameter of the second cylinder; a first conductive annular sheet is sleeved on one end of the second cylinder close to the first cylinder; and a second conductive annular sheet is arranged on one end of the second cylinder away from the first cylinder;

[0006] The hollow sensitive coil is fixed to one end of the first column away from the second column, and the first end of the hollow sensitive coil is conductively connected to the first conductive annular piece through a first connecting line; the second end of the hollow sensitive coil is conductively connected to the second conductive annular piece through a second connecting line;

[0007] The conductor of the high-frequency coaxial cable is conductively connected to the second conductive annular piece; the shielding layer of the high-frequency coaxial cable is conductively connected to the first conductive annular piece.

[0008] In the above technical solution, by setting the skeleton body as a stepped columnar structure and using two conductive circular ring pieces as a connecting structure to connect the hollow sensitive coil to the high-frequency coaxial cable, the skill requirements and proficiency of the operator can be greatly reduced, the consistency of the sensor probe can be greatly improved, and the manufacturing yield of the sensor probe can be greatly improved.

[0009] In an implementable solution, the first conductive annular sheet is pressed against the first column.

[0010] In an implementable solution, a first channel is provided on the first cylinder;

[0011] The first connecting wire is threaded through the first channel, and the exposed end of the first connecting wire at the end of the first channel is welded to the first conductive circular ring plate.

[0012] In an implementable solution, a second channel communicating with the first channel is provided on the first conductive circular ring plate;

[0013] The part of the first connecting wire threaded through the second channel is welded to the first conductive circular ring plate.

[0014] In an implementable solution, the first channel is a through hole or a groove formed on the first cylinder.

[0015] In an implementable solution, a third channel is provided on the first cylinder and the second cylinder, and a fourth channel communicating with the third channel is provided on the second conductive circular ring plate;

[0016] The second connecting wire is threaded through the third channel and the fourth channel, and the end of the second connecting wire threaded through the fourth channel is welded to the second conductive circular ring plate.

[0017] In an implementable solution, the diameter of the first cylinder is greater than the diameter of the hollow sensitive coil.

[0018] In an implementable solution, the hollow sensitive coil is bonded to the first cylinder by high-temperature adhesive.

[0019] In an implementable solution, a counterbore is provided at one end of the second cylinder facing away from the first cylinder, and the second conductive circular ring plate is fixed in the counterbore.

[0020] In a second aspect, a sensor is provided, and the sensor includes the sensor probe described in any one of the above.

[0021] In the above technical solution, by adopting a stepped columnar structure for the skeleton body and using two conductive circular ring plates as the connection structure to connect the hollow sensitive coil and the high-frequency coaxial cable, the skill requirements and proficiency of the operator can be greatly reduced, the consistency of the sensor probe can be greatly improved, and the production yield of the sensor probe can be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the sensor probe provided by the embodiment of the present application.

[0023] Reference numerals in the figure:

[0024] Skeleton body 100, second cylinder 110, counterbore 111, first cylinder 120, first channel 121, third channel 130, hollow sensitive coil 200, high-frequency coaxial cable 300, conductor 310, shielding layer 320, first conductive circular wafer 400, second channel 410, second conductive circular wafer 500, fourth channel 510, first connecting wire 600, second connecting wire 700. Specific embodiments

[0025] In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

[0026] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should have the ordinary meanings understood by those of ordinary skill in the art to which this disclosure belongs. The "first", "second", and similar terms used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0027] To facilitate the understanding of the sensor probe provided in the embodiments of the present application, its application scenario will be described first. The sensor probe provided in the embodiments of the present application is applied in sensors, such as most inductive displacement / rotation speed sensors. However, there are many uncontrollable factors in the current preparation process of the sensor probe, resulting in uncontrollable quality of the produced sensor probe and a low yield rate.

[0028] For a sensor probe in the prior art, a hollow sensitive coil is placed in a non-metallic coil housing, and a non-metallic coil skeleton is placed at the rear end of the hollow sensitive coil to tightly hold the hollow sensitive coil. The hollow sensitive coil together with the non-metallic coil housing and the non-metallic coil skeleton form the probe head body. Among them, the inner skeleton of the hollow sensitive coil is made of an engineering plastic solid cylinder. Two independent terminal posts are installed by drilling holes at one end of the solid cylinder. Since the two terminal posts are bonded to the engineering plastic solid cylinder with glue, it is easy to have loose bonding due to poor adhesion. The inner enameled connecting wire and the outer enameled connecting wire of the hollow sensitive coil are respectively wound around the two independent terminal posts and then welded. Since a very small inductance will be formed after the enameled connecting wire is wound around the terminal post, this very small inductance value will change with the number of winding turns and the tolerance of the terminal post, thus affecting the total inductance of the hollow sensitive coil and having a non-negligible impact on the parameters of the probe after production and the consistency of the probe. For a sensor with a range less than 2 mm, its hollow sensitive coil needs to be wound with an enameled wire of a very small diameter. The smaller the wire diameter of the enameled wire, the weaker its tensile strength, and it is easy to break the enameled wire during the winding process, resulting in scrapping.

[0029] In addition, the inner enameled connecting wire and the outer enameled connecting wire of the hollow sensitive coil respectively cross over and wind around the two independent terminal posts on the periphery of the solid cylinder. Since the crossing angle cannot be fixed, the result is that: during mass production, it is impossible to ensure that the lengths of the inner enameled connecting wire and the outer enameled connecting wire of the hollow sensitive coil of each product are the same, thus having a non-negligible impact on the parameters of the probe after production and the consistency of the probe.

[0030] Therefore, the embodiment of the present application provides a sensor probe, which improves the structure of the sensor probe, reduces the production difficulty of the sensor probe, and improves the qualified rate of product quality. The following will be described in detail with reference to specific drawings and embodiments.

[0031] Reference Figure 1 , Figure 1 shows a schematic structural diagram of the sensor probe provided by the embodiment of the present application. The main structure of the sensor probe provided by the embodiment of the present application includes a skeleton body 100, a hollow sensitive coil 200, and a high-frequency coaxial cable 300. Among them, the skeleton body 100 serves as a support structure to support the hollow sensitive coil 200. The hollow sensitive coil 200 is a functional device of the sensor probe. When the probe is working, detection is carried out through the inductance change of the hollow sensitive coil 200. The high-frequency coaxial cable 300 serves as a signal transmission component, and it is electrically connected to the hollow sensitive coil 200 to transmit the signal of the hollow sensitive coil 200.

[0032] Continue to refer to Figure 1As shown in the figure, the framework body 100 provided by the embodiment of the present application is a stepped column structure, which includes a first column body 120 and a second column body 110 arranged coaxially. Among them, the diameter of the first column body 120 is larger than that of the second column body 110, and a stepped structure is formed at the connection between the first column body 120 and the second column body 110. In the embodiment of the present application, the first column body 120 and the second column body 110 can be an integral structure or a split structure. When adopting the split structure, the first column body 120 and the second column body 110 can be fixedly connected by bonding.

[0033] In addition, two conductive circular ring plates are respectively fixed on the framework body 100. For the convenience of description, the two conductive circular ring plates are respectively named the first conductive circular ring plate 400 and the second conductive circular ring plate 500. Among them, the first conductive circular ring plate 400 is sleeved on one end of the second column body 110 close to the first column body 120, that is, the first conductive circular ring plate 400 is located at the stepped structure of the framework body 100. And the second conductive circular ring plate 500 is located at one end of the second column body 110 facing away from the first column body 120, that is, the second conductive circular ring plate 500 is located at the small head end (the end with a smaller diameter) of the framework body 100. The above-mentioned first conductive circular ring plate 400 and second conductive circular ring plate 500 are conductive connection adapters between the hollow sensitive coil 200 and the high-frequency coaxial cable 300. When realizing the conductive connection, the first conductive circular ring plate 400 and the second conductive circular ring plate 500 are respectively conductively connected to both ends of the hollow sensitive coil 200, and the first conductive circular ring plate 400 and the second conductive circular ring plate 500 are respectively connected to the shielding layer 320 and the conductor 310 of the high-frequency coaxial cable 300 in a one-to-one correspondence to realize the conductive connection between the hollow sensitive coil 200 and the high-frequency coaxial cable 300.

[0034] In a specific structure, the first conductive circular ring plate 400 is pressed against the first column body 120, that is, the first conductive circular ring plate 400 abuts against the stepped surface of the framework body 100, so that the assembly position of the first conductive circular ring plate 400 can be limited by the stepped surface, ensuring the consistency during its assembly.

[0035] When the hollow sensitive coil 200 is fixed, it is fixed at one end of the first column body 120 facing away from the second column body 110. Exemplarily, the hollow sensitive coil 200 can be bonded to the first column body 120 by high-temperature adhesive. This method can stably fix the hollow sensitive coil 200 on the framework body 100 through the high-temperature adhesive. Of course, in addition to the above-exemplified method, other methods can also be used for fixed connection, which are not specifically limited in the embodiment of the present application.

[0036] When the hollow sensitive coil 200 is conductively connected to the first conductive circular wafer 400 and the second conductive circular wafer 500, the first end of the hollow sensitive coil 200 is conductively connected to the first conductive circular wafer 400 through the first connecting wire 600; the second end of the hollow sensitive coil 200 is conductively connected to the second conductive circular wafer 500 through the second connecting wire 700. Among them, both the first connecting wire 600 and the second connecting wire 700 are enameled wires. One end of the first connecting wire 600 and the second connecting wire 700 are respectively welded to the corresponding end of the hollow sensitive coil 200, or the first connecting wire 600 and the second connecting wire 700 and the conductive part in the hollow sensitive coil 200 are of an integral structure. One end of the first connecting wire 600 and the second connecting wire 700 are respectively welded to the corresponding conductive circular wafers in a one-to-one correspondence to achieve fixation and conductive connection. Of course, in addition to the welding method, the fixation and conductive connection between the two can also be achieved through conductive glue.

[0037] When the high-frequency coaxial cable 300 is conductively connected to the first conductive circular wafer 400 and the second conductive circular wafer 500, the conductor 310 of the high-frequency coaxial cable 300 is conductively connected to the second conductive circular wafer 500; the shielding layer 320 of the high-frequency coaxial cable 300 is conductively connected to the first conductive circular wafer 400. Thus, the conductive connection between the high-frequency coaxial cable 300 and the hollow sensitive coil 200 is realized.

[0038] It can be seen from the above description that in the solution disclosed in the present application, by setting the skeleton body 100 as a stepped columnar structure and using two conductive circular wafers as the connection structure, the hollow sensitive coil 200 is connected to the high-frequency coaxial cable 300. It can be seen from the structure of the above example that in the solution disclosed in the present application, only a small modification is made to the skeleton body 100 inside the sensor probe, without changing the external dimensions of the probe, maintaining the performance of the sensor unchanged, greatly reducing the processing difficulty of the probe. Even if the wire diameter of the hollow sensitive coil 200 is extremely small, the operator can easily operate. Greatly reducing the requirements for the skills and proficiency of the operator, greatly improving the performance consistency of the sensor probes in the same batch during mass production, and greatly improving the production quality and the yield rate of the produced good products of the sensor probes.

[0039] In addition, when the conductive circular wafer is connected to the enameled wire, the two are directly welded or conductively bonded, without the need for the enameled wire to be wound, thereby reducing the interference of the inductance formed by the conductive connection part to the sensor probe and improving the detection accuracy of the sensor probe.

[0040] Continue to refer to Figure 1, when the second conductive circular sheet 500 provided in the embodiment of the present application is fixed to the second column 110, a counterbore 111 is provided at one end of the second column 110 facing away from the first column 120, and the second conductive circular sheet 500 is fixed in the counterbore 111, so as to facilitate the positioning of the second conductive circular sheet 500. And in combination with the positioning of the first conductive circular sheet 400 pressing against the step surface, it can be seen that in the embodiment of the present application, the first conductive circular sheet 400 and the second conductive circular sheet 500 are positioned through the structure of the skeleton body 100, so as to facilitate the installation of the first conductive circular sheet 400 and the second conductive circular sheet 500. In addition, it is also convenient for the connection of the hollow sensitive coil 200 and the high-frequency coaxial cable 300 to the two conductive circular sheets.

[0041] Continue to refer to Figure 1 , a first channel 121 is provided on the first column 120 provided in the embodiment of the present application. The above-mentioned first channel 121 is a channel for threading the first connecting wire 600, so that when the first connecting wire 600 is arranged, it is buried inside the skeleton body 100. Specifically, the first connecting wire 600 is threaded through the first channel 121, and the end of the first connecting wire 600 exposed outside the first channel 121 is welded to the first conductive circular sheet 400. Thus, the first connecting wire 600 can be located inside the skeleton body 100. The first channel 121 can be a through hole or a groove opened on the first column 120. As Figure 1 shown in Figure 1 it is exemplified that the first channel 121 is a straight through hole opened on the first column 120, and the straight through hole is located outside the second column 110, so that the threaded first connecting wire 600 can be exposed on the step surface of the skeleton body 100. When the above-mentioned scheme is adopted, the first connecting wire 600 is buried inside the skeleton body 100, and the first connecting wire 600 can be protected by the skeleton body 100, improving the safety of the first connecting wire 600.

[0042] In an alternative scheme, a second channel 410 communicating with the first channel 121 is provided on the first conductive circular sheet 400. The second channel 410 is an eccentric hole. When the first conductive circular sheet 400 is fixed to the second column 110 and presses against the step surface, the second channel 410 communicates with the first channel 121. The first connecting wire 600 can penetrate from the first through hole into the second through hole, and the part of the first connecting wire 600 threaded through the second channel 410 is welded to the first conductive circular sheet 400. By adopting the above method, it is convenient for the welding connection of the first connecting wire 600 and the first conductive circular sheet 400. At the same time, the first connecting wire 600 is inserted into the first conductive circular sheet 400, increasing the connection strength and conductive effect between the first connecting wire 600 and the first conductive circular sheet 400.

[0043] In addition, when the above connection method is adopted, compared with the existing solution of winding the enameled wire on the terminal, the enameled wire does not need to bear too much pulling force, thereby improving the safety of the connection line. At the same time, since the path of the first connection line 600 is a straight path and is buried in the skeleton body 100, it effectively avoids the technical problem that the angle of the inner circle enameled connection line and the outer circle enameled connection line of the hollow sensitive coil cannot be fixed when they are wound around the outer periphery of the solid cylinder and two independent terminals in the prior art, thereby achieving the quantification of the length of the first connection line 600, ensuring that the length of the inner circle enameled connection line and the outer circle enameled connection line of the hollow sensitive coil of each product is consistent, thereby ensuring the consistency of the probe parameters and the probe after the production is completed.

[0044] Continue to refer Figure 1 In an optional solution, the second connecting wire 700 may also be buried in a manner similar to the first connecting wire 600. Specifically, the first column 120 and the second column 110 are provided with a third channel 130, and the third channel 130 is a through hole extending from the first column 120 to the second column 110. At the same time, the second conductive annular sheet 500 is provided with a fourth channel 510 connected to the third channel 130. When the second connecting wire 700 is passed through, the second connecting wire 700 is passed through the third channel 130 and the fourth channel 510, and the end of the second connecting wire 700 passed through the fourth channel 510 is welded to the second conductive annular sheet 500. Thereby, the second end of the hollow sensitive coil 200 is welded to the second conductive annular sheet 500. As shown Figure 1 As shown in FIG. 1 , the third channel 130 is located at the axis of the frame body 100 , and the second connecting wire 700 can pass through the third channel 130 and be directly welded to the second conductive annular piece 500 .

[0045] In an optional solution, in order to ensure the supporting effect of the hollow sensitive coil 200, the diameter of the first column 120 is larger than the diameter of the hollow sensitive coil 200. Figure 1 As shown in , the large end (the end with a larger diameter) of the frame body 100 is larger than the diameter of the hollow sensitive coil 200, so that there is enough space to support the hollow sensitive coil 200. In addition, when the shell is mounted on the outer side of the frame, interference between the shell and the hollow sensitive coil 200 can be avoided during mounting, thereby better protecting the hollow sensitive coil 200.

[0046] Continue to refer Figure 1 When the high-frequency coaxial cable 300 is connected to the two conductive circular rings, the high-frequency coaxial cable 300 is located at the small end of the frame body 100, and the shielding layer 320 of the high-frequency coaxial cable 300 is set on the second column 110. Figure 1As shown, the length of the shielding layer 320 of the high-frequency coaxial cable 300 is greater than the length of the internal conductor 310, and the extended part is sleeved on the first column 120 and connected to the first conductive circular ring 400, which facilitates the conductive connection between the shielding layer 320 and the first conductive circular ring 400. In addition, the entire circumference of the shielding layer 320 is connected to the first conductive circular ring 400, improving the reliability and conductivity.

[0047] After assembling the above-mentioned skeleton body 100, high-frequency coaxial cable, and hollow sensitive coil 200, they can be encapsulated integrally.

[0048] The embodiment of the present application also provides a sensor, which includes the sensor probe of any one of the above. In the above technical solution, by setting the skeleton body 100 as a stepped columnar structure and using two conductive circular rings as the connection structure to connect the hollow sensitive coil 200 and the high-frequency coaxial cable 300, the requirements for the skills and proficiency of operators can be greatly reduced, the performance consistency of the sensor probes in the same batch of mass production can be greatly improved, and the production quality and yield rate of the sensor probes can be greatly improved.

[0049] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification shall be included in the protection scope of this disclosure.

[0050] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all of them should be covered by the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. A sensor probe, characterized in that: It includes a skeleton body, a hollow sensitive coil and a high-frequency coaxial cable; wherein, The skeleton body comprises a first cylinder and a second cylinder which are coaxially arranged, wherein the diameter of the first cylinder is larger than the diameter of the second cylinder; a first conductive annular sheet is sleeved on one end of the second cylinder close to the first cylinder; and a second conductive annular sheet is arranged on one end of the second cylinder away from the first cylinder; The hollow sensitive coil is fixed to one end of the first column away from the second column, and the first end of the hollow sensitive coil is conductively connected to the first conductive annular piece through a first connecting line; the second end of the hollow sensitive coil is conductively connected to the second conductive annular piece through a second connecting line; The conductor of the high-frequency coaxial cable is conductively connected to the second conductive annular piece; the shielding layer of the high-frequency coaxial cable is conductively connected to the first conductive annular piece.

2. The sensor probe according to claim 1, characterized in that: The first conductive annular sheet is pressed against the first column.

3. The sensor probe according to claim 2, characterized in that: The first column is provided with a first channel; The first connecting wire is passed through the first channel, and the end of the first connecting wire exposed in the first channel is welded and connected to the first conductive circular ring sheet.

4. The sensor probe according to claim 3, characterized in that: The first conductive annular sheet is provided with a second channel connected to the first channel; The portion of the first connecting wire that passes through the second channel is welded and connected to the first conductive circular ring sheet.

5. The sensor probe according to claim 3, characterized in that: The first channel is a through hole or a groove opened on the first column.

6. The sensor probe according to any one of claims 1 to 5, characterized in that: The first column and the second column are provided with a third channel, and the second conductive circular ring sheet is provided with a fourth channel connected with the third channel; The second connecting wire is inserted into the third channel and the fourth channel, and the end of the second connecting wire inserted into the fourth channel is welded and connected to the second conductive circular ring sheet.

7. The sensor probe according to claim 6, characterized in that: The diameter of the first column is greater than the diameter of the air-core sensitive coil.

8. The sensor probe according to claim 7, characterized in that: The hollow sensitive coil is bonded to the first column by high-temperature adhesive.

9. The sensor probe according to claim 6, characterized in that: A countersunk hole is arranged at one end of the second column away from the first column, and the second conductive annular sheet is fixed in the countersunk hole.

10. A sensor, characterized in that: The invention comprises a sensor probe as claimed in any one of claims 1 to 9.

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