Electric signal rotation transmission device and manufacturing method thereof

Abstract

The invention relates to an electric signal rotary transmission device and a manufacturing method thereof. The electric signal rotary transmission device is characterized in that an inner wiring body comprises an aluminum oxide ceramic ring base body, a guide pin and an electric connector; the two rows of guide pin mounting holes in the side wall of the aluminum oxide ceramic ring base body are welded with guide pins extending inwards; a metal coating is coated on the outer annular groove corresponding to the lead pin, and the metal coating is electrically communicated with the corresponding lead pin; the two split bodies of the electric connector are respectively provided with a row of lead pin inserting holes, and each lead pin inserting hole is correspondingly provided with an electric signal line led out from one end of the corresponding split body. The two split bodies are inserted and glued in an inner hole of the aluminum oxide ceramic ring base body, and the lead pin insertion holes are in one-to-one insertion fit with the corresponding rows of lead pins, so that the lead pins are electrically connected with the inner ends of the corresponding electric signal lines; the two insulating rods on the electric brush carrier of the external wire body are connected with a plurality of electric brush wires and are connected with external leads; the inner ends of the two rows of brush wires are in lap joint with the corresponding annular grooves of the two rows of lead pins respectively, so that the outer leads are electrically connected with the corresponding electric signal lines. The insulating strength is high, and maintenance and rerouting are convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric signal rotation transmission of rotary axis type inertial navigation, and in particular relates to an electric signal rotation transmission device. Background Art

[0002] In high-precision inertial navigation systems, an axis rotation structure is usually used. For systems that rotate 180° forward and backward, electrical signals can be transmitted through soft wires. However, for application scenarios that require continuous rotation, soft wires obviously cannot meet the requirements. Therefore, a method that can overcome the relative rotation of the internal and external structures and realize the transmission of electrical signals is needed. Traditional rotating power transmission devices use epoxy resin glue as the insulation layer. Since the colloid is a honeycomb structure, it often has defects such as insufficient insulation strength in harsh environments such as humidity and salt spray. Once maintenance or line changes occur, the original power transmission device is often scrapped because the inner loop is not long enough and the wiring will affect the electrical performance, causing great waste. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an electrical signal rotation transmission device and a manufacturing method thereof. The transmission device has high insulation strength and is convenient for maintenance and replacement.

[0004] One of the above objects of the present invention is achieved by the following technical solution:

[0005] An electrical signal rotation transmission device comprises an inner wiring body and an outer wiring body;

[0006] The internal wiring body includes an alumina ceramic ring matrix, a lead pin, and an electrical connector;

[0007] The alumina ceramic ring substrate is made of a ceramic material with an alumina content of 99.5%, and is in the shape of a thin sleeve. Two rows of lead pin mounting holes are vertically arranged on the side wall of the alumina ceramic ring substrate, and the two rows of lead pin mounting holes are arranged at relative positions of 180 degrees, and the two rows of lead pin holes are staggered in sequence; a lead pin extending into the ring is welded in each lead pin hole; an annular groove is formed on the outer surface of the alumina ceramic ring substrate corresponding to the position of each lead pin, and left and right intervals are set between adjacent annular grooves, and a metal coating is plated in the annular groove, and the metal coating is electrically connected with the lead pin on the inner side of the corresponding annular groove;

[0008] The electrical connector is a two-part structure, each part is in the shape of a small semi-cylinder, and a row of lead pin insertion holes are respectively provided on the two parts corresponding to the two rows of lead pins fixed on the alumina ceramic ring substrate, and lead wire holes are provided on the two parts corresponding to the positions of each lead pin insertion hole in the axial direction, and an electric signal line is glued into each lead wire hole, and the electric signal leads are all led out from one end of the part; the two parts are glued into the inner hole of the alumina ceramic ring substrate in a facing manner, and the lead pin insertion holes on the two parts are respectively plugged in with the two rows of lead pins on the alumina ceramic ring substrate to form a one-to-one plug-in match, so that the lead pins are electrically connected to the inner ends of the corresponding electric signal lines;

[0009] The external wiring body includes a brush holder and brush wires; two insulating rods are fixed on the brush holder, the two insulating rods are arranged parallel to each other, and a plurality of brush wires are vertically connected to the two insulating rods at a set interval, and the outer end of each brush wire is connected to an external lead wire;

[0010] Bearings are respectively installed between the outer ends of the two ends of the alumina ceramic ring substrate of the inner wiring body and the inner ends of the two ends of the outer wiring body, so that the outer wiring body and the outer wiring body form an internal and external rotation support fit, and the inner ends of the two rows of brush wires on the outer wiring body are respectively in overlapping contact with the annular grooves corresponding to the two rows of lead pins on the inner wiring body, so that the external leads are electrically connected to the corresponding electrical signal lines.

[0011] Moreover, the inner extension length of the guide needle is 1±0.1 mm.

[0012] Moreover, the thickness of the metal coating is greater than 0.1 mm.

[0013] Moreover, the metal plating layer is a gold plating layer, a palladium-nickel alloy plating layer or a gold-containing composite plating layer.

[0014] The second objective of the present invention is achieved by the following technical solutions:

[0015] A method for manufacturing the above-mentioned electrical signal rotation transmission device comprises the following steps:

[0016] Step 1, processing a 99.5% alumina ceramic ring blank, and processing two rows of relatively staggered lead pin installation holes on the ceramic ring blank along the radial direction to form an alumina ceramic ring matrix;

[0017] Step 2, processing the metal lead pin, welding the lead pin to the lead pin mounting hole on the alumina ceramic ring substrate by vacuum brazing, and ensuring that the inner extension of the ring lead pin is 1±0.1mm;

[0018] Step 3, machining an annular groove on the outside of the assembly of the alumina ceramic ring substrate and the lead pin corresponding to each lead pin;

[0019] Step 4: After the annular groove is formed, the entire surface is electroplated to form a metal coating with a film thickness of more than 0.1 mm;

[0020] Step 5: After plating, the plating layer in the annular groove is retained, and the excess plating layer in the rest is removed;

[0021] Step 6: Make two parts of the electrical connector, each part is a small semicircular columnar structure, a row of lead pin insertion holes are vertically processed at the position corresponding to the high point on each part, and a lead hole is provided at the position corresponding to the lead pin insertion hole on each part, one end of the lead hole is connected to the corresponding lead pin insertion hole, and the other end extends to one end of the part; insert an electrical signal line into each lead hole, and fill it with glue for packaging;

[0022] Step 7, insert the two parts into the inner cavity of the alumina ceramic ring matrix, plug the lead pin holes into the lead pins one by one and fix them with silicone to complete the connection of the internal wiring body of the electrical signal rotation transmission device;

[0023] Step 8, make an external wiring body, make the external wiring body and the internal wiring body form a relatively rotatable fit through bearings at both ends, make the brush wires on the external wiring body and the annular grooves on the internal wiring body overlap and form relatively slidable contact one by one, and complete the production of the electrical signal rotation transmission device.

[0024] Moreover, the processing of the annular groove in step 3 and the removal of the excess coating in step 5 are both carried out by ultrasonic processing.

[0025] The advantages and positive effects of the present invention are:

[0026] 1. The present invention uses an alumina ceramic ring matrix as the basic component of the signal distribution line. Compared with the existing insulation method using epoxy resin glue, etc., it avoids problems such as glue aging and falling off, and achieves higher insulation strength and insulation retention.

[0027] 2. The present invention adopts an alumina ceramic ring with an insulation matrix of over 99.5%. The lead pin is welded to the alumina ceramic ring matrix by vacuum brazing, and a metal coating is arranged on the outer side of the welded lead pin to achieve the transmission of electrical signals. The lead pin socket on the electrical connector is plugged in with the lead pin to complete the internal connection of the electrical signal. If there is any subsequent line change or maintenance, it is only necessary to replace the electrical connector, while the difficult-to-process ceramic ring, vacuum brazing and coating can be retained, which greatly saves costs and improves the transmission quality of electrical signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the electrical signal rotation transmission device of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the alumina ceramic ring matrix in the internal wiring body of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the lead needle of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of welding the lead pin to the alumina ceramic ring substrate of the present invention;

[0032] Figure 5 It is a schematic diagram of the structure after an annular groove is processed on the outer surface of the alumina ceramic ring substrate of the present invention;

[0033] Figure 6 6a is a schematic diagram of the split structure of the electrical connector of the present invention, 6b is a front view, 6c is a top view, and 6c is a right view;

[0034] Figure 7 It is a structural schematic diagram of the present invention in which an electric connector is inserted into an alumina ceramic ring matrix and then internal lead wires are connected. DETAILED DESCRIPTION

[0035] The structure of the present invention is further described below with reference to the accompanying drawings and by way of examples. It should be noted that the present examples are descriptive rather than restrictive.

[0036] A device for the rotational transmission of electrical signals, see Figure 1-Figure 7 The invention point is that it includes an inner wiring body 3 and an outer wiring body 1 which are rotatably matched with each other.

[0037] The internal wiring body comprises an alumina ceramic ring substrate 3.1, lead pins 3.2, and an electrical connector.

[0038] The alumina ceramic ring substrate is made of ceramic material with an alumina content of 99.5%, and is in the shape of a thin sleeve. Two rows of lead pin mounting holes 3.1.1 are vertically arranged on the side wall of the alumina ceramic ring substrate. The two rows of lead pin mounting holes are arranged at relative positions of 180°, and the two rows of lead pin holes are staggered in sequence. A lead pin extending into the ring is welded in each lead pin hole, and the extending length of the lead pin is 1±0.1mm. An annular groove 3.3 is formed on the outer surface of the alumina ceramic ring substrate corresponding to the position of each lead pin, and left and right intervals are set between adjacent annular grooves. A metal coating is plated in the annular groove, and the metal coating is electrically connected to the lead pin on the inner side of the corresponding annular groove, and the thickness of the metal coating is >0.1mm. The electrical connector is a two-part structure, each part 3.4 is in the shape of a small semi-cylinder, and a row of lead pin insertion holes 3.4.1 are respectively provided on the two parts corresponding to the two rows of lead pins fixed on the alumina ceramic ring substrate, and lead wire holes are provided in the axial direction at the positions corresponding to each lead pin insertion hole on the two parts, and an electric signal line 3.5 is glued into each lead wire hole, and the electric signal leads are all led out from one end of the part. The two parts are glued into the inner hole of the alumina ceramic ring substrate in a facing manner, and the lead pin insertion holes on the two parts are respectively plugged in with the two rows of lead pins on the alumina ceramic ring substrate, so that the lead pins are electrically connected to the inner ends of the corresponding electric signal lines.

[0039] The external wiring body comprises a brush holder 1.2 and brush wires 1.3. Two insulating rods are fixed on the brush holder, the two insulating rods are arranged parallel to each other, a plurality of brush wires are vertically connected to the two insulating rods at a set interval, and the outer end of each brush wire is connected to an external lead wire 1.1.

[0040] Bearings are respectively installed between the outer ends of the two ends of the alumina ceramic ring substrate of the inner wiring body and the inner ends of the two ends of the outer wiring body, so that the outer wiring body and the outer wiring body form an internal and external rotation support fit, and the inner ends of the two rows of brush wires on the outer wiring body are respectively in overlapping contact with the annular grooves corresponding to the two rows of lead pins on the inner wiring body, so that the external leads are electrically connected to the corresponding electrical signal lines.

[0041] The manufacturing method of the electric signal rotation transmission device of the present invention is as follows:

[0042] First, a 99.5% alumina ceramic ring blank is processed, and a plurality of lead pin installation holes with a diameter of 1.2 mm are radially processed on the ceramic ring blank (the number of lead pin installation holes depends on the requirements of the power transmission loop of the power transmission device) to form the alumina ceramic ring matrix. The lead pin installation holes can preferably be processed in two rows on the ceramic ring blank (to ensure the number of power transmission loops and facilitate insulation between loops).

[0043] Then, the metal lead pin is processed, the gap between the lead pin diameter and the mounting hole is 0.01-0.03, the lead pin is welded into the lead pin mounting hole on the ceramic ring substrate by vacuum brazing, and the inner extension amount of the ring lead pin is ensured to be 1±0.1mm.

[0044] The above-mentioned aluminum oxide ceramic ring substrate and the lead pin assembly are ultrasonically processed on the outside of each lead pin to form an annular groove. During the processing, the metal lead pin and the ceramic ring are processed simultaneously.

[0045] After the annular groove is formed, the entire layer is electroplated to form a metal coating with a film thickness of >0.1mm. The coating should generally be a gold coating, a palladium-nickel alloy coating, or a gold-containing composite coating.

[0046] After plating, the plating in the annular groove should be retained, and the excess plating in the rest of the part should be removed. Ultrasonic processing should generally be used.

[0047] A special miniature electrical connector is made. The electrical connector consists of two parts, each of which is a small semicircular columnar structure. A row of lead pin insertion holes are vertically processed at the position corresponding to the high point on each part, and the diameter of the lead pin insertion holes is 1mm. There are lead holes at the position corresponding to the lead pin insertion holes on each part, one end of the lead hole is connected to the corresponding lead pin insertion hole, and the other end extends to one end of the part; an electrical signal line is inserted into each lead hole, and the electrical signal line is an enameled wire with a diameter of 0.1-0.3mm, which is encapsulated into a small semicircular column with glue filling, and the encapsulated electrical signal line has an insulating sheath.

[0048] Insert the two parts of the electrical connector into the inner cavity of the alumina ceramic ring matrix, assemble the lead pin sockets and the lead pins one by one and fix them with electrical silicone to complete the connection of the inner wiring body of the electrical signal rotation transmission device.

[0049] An external wiring body is manufactured, and the external wiring body and the internal wiring body are relatively rotatable through bearings 2 at both ends. The brush wires on the external wiring body and the annular grooves on the internal wiring body are overlapped and relatively slidably contacted to complete the manufacture of the electrical signal rotation transmission device.

[0050] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. An electrical signal rotation transmission device, comprising an inner wiring body and an outer wiring body, characterized in that: The internal wiring body includes an alumina ceramic ring matrix, a lead pin, and an electrical connector; The alumina ceramic ring substrate is made of a ceramic material with an alumina content of 99.5%, and is in the shape of a thin sleeve. Two rows of lead pin mounting holes are vertically arranged on the side wall of the alumina ceramic ring substrate, and the two rows of lead pin mounting holes are arranged at relative positions of 180 degrees, and the two rows of lead pin holes are staggered in sequence; a lead pin extending into the ring is welded in each lead pin hole; an annular groove is formed on the outer surface of the alumina ceramic ring substrate corresponding to the position of each lead pin, and left and right intervals are set between adjacent annular grooves, and a metal coating is plated in the annular groove, and the metal coating is electrically connected with the lead pin on the inner side of the corresponding annular groove; The electrical connector is a two-part structure, each part is in the shape of a small semi-cylinder, and a row of lead pin insertion holes are respectively provided on the two parts corresponding to the two rows of lead pins fixed on the alumina ceramic ring substrate, and lead wire holes are provided on the two parts corresponding to the positions of each lead pin insertion hole in the axial direction, and an electric signal line is glued into each lead wire hole, and the electric signal leads are all led out from one end of the part; the two parts are glued into the inner hole of the alumina ceramic ring substrate in a facing manner, and the lead pin insertion holes on the two parts are respectively plugged in with the two rows of lead pins on the alumina ceramic ring substrate to form a one-to-one plug-in match, so that the lead pins are electrically connected to the inner ends of the corresponding electric signal lines; The external wiring body includes a brush holder and brush wires; two insulating rods are fixed on the brush holder, the two insulating rods are arranged parallel to each other, and a plurality of brush wires are vertically connected to the two insulating rods at a set interval, and the outer end of each brush wire is connected to an external lead wire; Bearings are respectively installed between the outer ends of the two ends of the alumina ceramic ring substrate of the inner wiring body and the inner ends of the two ends of the outer wiring body, so that the outer wiring body and the outer wiring body form an internal and external rotation support fit, and the inner ends of the two rows of brush wires on the outer wiring body are respectively in overlapping contact with the annular grooves corresponding to the two rows of lead pins on the inner wiring body, so that the external leads are electrically connected to the corresponding electrical signal lines.

2. The electrical signal rotation transmission device according to claim 1, characterized in that: The inner extension length of the guide needle is 1±0.1 mm.

3. The electrical signal rotation transmission device according to claim 1, characterized in that: The thickness of the metal coating is >0.1 mm.

4. The electrical signal rotation transmission device according to claim 1, characterized in that: The metal plating layer is a gold plating layer, a palladium-nickel alloy plating layer or a gold-containing composite plating layer.

5. A method for manufacturing an electrical signal rotation transmission device according to any one of claims 1 to 4, characterized in that: The steps include: Step 1, processing a 99.5% alumina ceramic ring blank, and processing two rows of relatively staggered lead pin installation holes on the ceramic ring blank along the radial direction to form an alumina ceramic ring matrix; Step 2, processing the metal lead pin, welding the lead pin to the lead pin mounting hole on the alumina ceramic ring substrate by vacuum brazing, and ensuring that the inner extension of the ring lead pin is 1±0.1mm; Step 3, machining an annular groove on the outside of the assembly of the alumina ceramic ring substrate and the lead pin corresponding to each lead pin; Step 4: After the annular groove is formed, the entire surface is electroplated to form a metal coating with a film thickness of more than 0.1 mm; Step 5: After plating, the plating layer in the annular groove is retained, and the excess plating layer in the rest is removed; Step 6: Make two parts of the electrical connector, each part is a small semicircular columnar structure, a row of lead pin insertion holes are vertically processed at the position corresponding to the high point on each part, and a lead hole is provided at the position corresponding to the lead pin insertion hole on each part, one end of the lead hole is connected to the corresponding lead pin insertion hole, and the other end extends to one end of the part; insert an electrical signal line into each lead hole, and fill it with glue for packaging; Step 7, insert the two parts into the inner cavity of the alumina ceramic ring matrix, plug the lead pin holes into the lead pins one by one and fix them with electrical silicone to complete the connection of the internal wiring body of the electrical signal rotation transmission device; Step 8, make an external wiring body, make the external wiring body and the internal wiring body form a relatively rotatable fit through bearings at both ends, make the brush wires on the external wiring body and the annular grooves on the internal wiring body overlap and form relatively slidable contact one by one, and complete the production of the electrical signal rotation transmission device.

6. The method for manufacturing the electrical signal rotation transmission device according to claim 5, characterized in that: The processing of the annular groove in step 3 and the removal of the excess coating in step 5 are both carried out by ultrasonic processing.

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