Signal transmission device for coal mine drilling

Abstract

The invention relates to a signal transmission device for coal mine drilling. The connector comprises a male butt joint module, a transmission line and a female butt joint module, the male butt joint module is composed of a first sleeve, a male butt joint and a first positioning ring, and the circumferential outer wall of the male butt joint is provided with a plurality of contact elastic pieces protruding outwards; the female butt joint module consists of a second sleeve, a female butt joint and a second positioning ring; the transmission line is composed of an inner core and an isolation layer, waterproof sealing kits are arranged between the first sleeve and the transmission line and between the second sleeve and the transmission line, and the inner wall of the insertion cavity or the outer wall of the butt joint section is sleeved with a plurality of sealing rings. The connection part of the inner core and the two butt joints and the butt joint part of the two butt joints are parts where water seepage is most likely to happen, the two positions are sealed, the sealing effect can be greatly improved, meanwhile, the contact elastic piece can deform in a self-adaptive mode after being attached to the inner wall of the insertion cavity, the contact elastic piece and the insertion cavity are in an attached state all the time, and the sealing effect is improved. Therefore, the conductive effect between the two is ensured.

Description

Technical Field

[0001] This invention relates to a signal transmission device, and more particularly to a signal transmission device used in coal mine drilling. Background Technology

[0002] The mining center-cable directional drill pipe is a drilling device used in underground mines such as coal mines and metal mines. It is mainly used for directional drilling, gas drainage, and geological exploration. Its core feature is the center-cable design, which enables signal transmission and data acquisition, allowing real-time monitoring of key parameters during drilling, such as depth, angle, and azimuth. The mining center-cable directional drill pipe consists of: the drill pipe body, made of high-strength alloy steel, which is wear-resistant, corrosion-resistant, and impact-resistant, suitable for complex geological conditions; the center-cable, which integrates electrical or optical cables inside the drill pipe for transmitting electrical or optical signals, enabling two-way communication between the ground equipment and the drill bit; a signal transmission system that transmits data collected by the drill bit sensors to the ground control system in real time via the center-cable; and a sensor module installed at the front end of the drill bit or drill pipe for collecting various parameters during drilling. The drill pipe body is hollow and filled with drilling mud, and the center-cable needs to be fixed inside the drill pipe body. Therefore, waterproofing is a crucial issue that must be addressed for the center-cable. Existing center cable assemblies suffer from complex structures and increased installation difficulty in order to achieve a good sealing effect. To improve the assembly efficiency of center cables, it is necessary to develop a center cable product with a simplified structure, easy assembly, and good waterproof performance. Summary of the Invention

[0003] This invention provides a signal transmission device for use in coal mine drilling; it solves the problems of complex structure and numerous parts in the prior art, which lead to difficult assembly and increased risk of water leakage.

[0004] The above-mentioned technical problems of the present invention are mainly solved by the following technical solution: a signal transmission device for coal mine drilling, comprising a male connector module, a transmission line and a female connector module, wherein the male connector module is composed of a first sleeve, a male connector and a first positioning ring, the first sleeve is made of insulating material, the first positioning ring is used to engage and limit the corresponding part of the drill rod, the interior of the first sleeve has a plug-in cavity and a first mounting cavity that pass through its two ends, the outer circumferential wall of the male connector is provided with a plurality of outwardly protruding contact springs, the male connector is fixed in the plug-in cavity as a whole and defines an annular hollow cavity, and the first positioning ring is fixedly sleeved on the outer wall of the first sleeve;

[0005] The female connector module consists of a second sleeve, a female connector, and a second positioning ring. The second sleeve is made of insulating material, and the second positioning ring is used to engage and limit the corresponding part of the drill rod. The interior of the second sleeve has a second mounting cavity and a third mounting cavity that extend through its two ends. The outer end of the second sleeve has a mating section whose outer contour is adapted to the inner contour of the insertion cavity. The female connector is fixed in the second mounting cavity as a whole, and the outer end of the female connector is provided with an insertion cavity adapted to the male connector.

[0006] The transmission line consists of an inner core and an isolation layer. One end of the inner core is electrically and fixedly connected to the male connector through the first mounting cavity, and the other end is electrically and fixedly connected to the female connector through the third mounting cavity. Both the first sleeve and the second sleeve are provided with water-proof sealing kits between themselves and the transmission line to prevent water from flowing into the first mounting cavity and the third mounting cavity. Several sealing rings are fitted on the inner wall of the insertion cavity or the outer wall of the mating section.

[0007] In practical use, the entire invention is installed and fixed inside the drill pipe. The drill pipes are connected to each other, allowing the female and male connector modules of the invention to conduct electricity simultaneously. The exterior is filled with mud and water. The inner core of the transmission line, which serves as the signal transmission channel, needs to be completely protected from water immersion. The isolation layer prevents the inner core from contacting water. The connection points between the inner core and the two connectors, as well as the mating points of the two connectors, are the most prone to water seepage. The male connector module of this invention forms an annular hollow cavity. The mating section of the female connector module can be directly inserted into this annular hollow cavity. By fitting several sealing rings on the inner wall of the insertion cavity or the outer wall of the mating section, the mating points are tightly sealed. Simultaneously, the first and second sleeves are equipped with water-proof sealing kits between themselves and the transmission line to prevent water from flowing into the first and third mounting cavities. This provides a good waterproof effect for the connection points between the inner core and the two connectors, as well as the mating points of the two connectors.

[0008] For a stable electrical connection to be achieved, the female and male connectors must have sufficiently reliable contact. A larger contact area results in lower resistance and more stable signal transmission. However, due to assembly precision requirements, when two drill pipes are joined end-to-end, the corresponding female and male connectors are unlikely to be perfectly coaxial. To facilitate easier docking, the outer diameter of the male connector needs to be smaller than the inner diameter of the insertion cavity on the female connector, which presents a contradiction. To resolve this contradiction, this application incorporates several outwardly protruding contact springs on the male connector. The size of the male connector body is smaller than the inner diameter of the insertion cavity, allowing for easier insertion of the male connector head. Simultaneously, the contact springs on the body increase the outward extension. After the contact springs conform to the inner wall of the insertion cavity, they self-deform, ensuring a constant contact and thus guaranteeing electrical conductivity.

[0009] Furthermore, a contact sleeve is fixedly fitted on the outer circumferential wall of the male connector, and the contact spring is disposed on the contact sleeve; in order to increase conductivity, the outer surfaces of the contact sleeve and the male connector are provided with a gold plating layer. The gold plating layer can not only greatly reduce the resistance value of the contact part, but also play a role in preventing rust and corrosion.

[0010] Furthermore, the isolation layer is a PU tube; the waterproof sealing kit includes a first sleeve and a second sleeve. The first sleeve has an internal thread section, an external thread section, and an inner core constraint section. The second sleeve is screwed onto the external thread section. The PU tube is tightly inserted into the annular gap between the second sleeve and the inner core constraint section. The internal thread section is waterproofly screwed onto the inner end of the first sleeve or the second sleeve. PU tubes have good waterproof and corrosion-resistant properties, making them a good choice as a protective isolation layer for the inner core. Both ends of the PU tube are clamped and fixed between the first and second sleeves, providing a good sealing effect. The first sleeve is screwed onto both sleeves, and adhesive is used to achieve a waterproof effect.

[0011] Therefore, the present invention has the following characteristics compared with the prior art: 1. The connection part between the inner core and the two pairs of connectors and the mating part of the two pairs of connectors are the parts most prone to water leakage. The present invention seals these two positions, which can greatly improve the sealing effect. At the same time, the contact spring will self-deform after it fits against the inner wall of the insertion cavity, so that the two are always in a fitted state, thereby ensuring the conductivity between the two. Attached Figure Description

[0012] Appendix Figure 1 This is a schematic diagram of the installation of the male connector module and the drill pipe;

[0013] Appendix Figure 2 This is a structural diagram of a waterproof sealing kit;

[0014] Appendix Figure 3 This is a schematic diagram of the installation of the female connector module and the drill pipe;

[0015] Appendix Figure 4 This is a structural diagram of the female connector module;

[0016] Appendix Figure 5 This is an exploded view of the female connector module;

[0017] Appendix Figure 6 This is a sectional view of the second sleeve. Detailed Implementation

[0018] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Example 1: See Figure 1 , Figure 3 , Figure 4 and Figure 5 A signal transmission device for coal mine drilling includes a male connector module 100, a transmission line 200, and a female connector module 300. The male connector module consists of a first sleeve 110, a male connector 120, and a first positioning ring 130. The first sleeve is made of POM material, and its outer wall is provided with a first clamping part 111 for easy tool clamping, fixing, and anti-torsion. The first positioning ring is made of 45 steel and is used to engage and limit the corresponding part of the drill rod. The interior of the first sleeve forms a plug-in cavity 112 and a first mounting cavity 113 that pass through its two ends. The male connector is made of beryllium copper material. The outer circumference of the male connector is provided with several outwardly protruding contact springs 121. The male connector is fixed in the plug-in cavity and defines an annular hollow cavity. The first positioning ring is sleeved on the outer wall of the first sleeve and is provided with a locking nut 10 for locking. The locking nut is made of 304 stainless steel.

[0021] The female connector module consists of a second sleeve 310, a female connector 320, and a second positioning ring 330. The second sleeve is made of POM material, and its outer wall is provided with a second clamping part 314 for easy tool clamping, fixing, and anti-torsion. The second positioning ring is also made of 45# steel and is used to engage and limit the corresponding part of the drill pipe. The interior of the second sleeve has a second mounting cavity 311 and a third mounting cavity 312 that extend through both ends of the sleeve (see...). Figure 6 The outer end of the second sleeve forms a mating section 313 whose outer contour is adapted to the inner contour of the insertion cavity. The female connector is made of beryllium copper material and is fixed in the second mounting cavity. The outer end of the female connector is provided with an insertion cavity 321 adapted to the male connector.

[0022] The transmission line consists of an inner core 210 and an isolation layer 220. The inner core is a beryllium copper rod, and the isolation layer is a PU tube. One end of the inner core is electrically connected and fixed to the male connector through the first mounting cavity, and the other end is electrically connected and fixed to the female connector through the third mounting cavity. Waterproof sealing kits 400 are provided between the first sleeve and the second sleeve and the transmission line to prevent water from flowing into the first mounting cavity and the third mounting cavity. Three sealing rings 20 are fitted on the outer wall of the mating section.

[0023] In practical use, this embodiment is installed and fixed inside the drill pipe. The drill pipes are connected to each other, allowing the female and male connector modules in this embodiment to conduct electricity simultaneously. The outside is filled with mud and water. The inner core of the transmission line is the signal transmission channel and needs to be completely protected from water immersion. The isolation layer can prevent the inner core from contacting water. The connection between the inner core and the two connectors, as well as the docking point of the two connectors, are the most prone to water seepage. In this embodiment, the male connector module forms an annular hollow cavity. The docking section of the female connector module can be directly inserted into this annular hollow cavity. By fitting several sealing rings on the inner wall of the insertion cavity or the outer wall of the docking section, the docking point of the two is tightly sealed. At the same time, the first and second sleeves are equipped with water-proof sealing kits between themselves and the transmission line to prevent water from flowing into the first and third mounting cavities. This provides a good waterproof effect for the connection between the inner core and the two connectors, as well as the docking point of the two connectors.

[0024] For a stable electrical connection to be achieved, the female and male connectors must have sufficiently reliable contact. A larger contact area results in lower resistance and more stable signal transmission. However, due to assembly precision requirements, when two drill pipes are joined end-to-end, the corresponding female and male connectors are unlikely to be perfectly coaxial. To facilitate easier docking, the outer diameter of the male connector needs to be smaller than the inner diameter of the insertion cavity on the female connector, which presents a contradiction. To resolve this contradiction, this application incorporates several outwardly protruding contact springs on the male connector. The size of the male connector body is smaller than the inner diameter of the insertion cavity, allowing for easier insertion of the male connector head. Simultaneously, the contact springs on the body increase the outward extension. After the contact springs conform to the inner wall of the insertion cavity, they self-deform, ensuring a constant contact and thus guaranteeing electrical conductivity.

[0025] See Figure 5 A contact sleeve is fixedly fitted on the outer circumference of the male connector. The contact sleeve consists of a first ring 122, a second ring 123, and several contact springs connected between the two rings. The contact springs are semi-circular structures that bulge outward. In order to increase conductivity, the outer surfaces of the contact sleeve and the male connector are plated with gold. The gold plating layer can not only greatly reduce the resistance value of the contact part, but also play a role in preventing rust and corrosion.

[0026] See Figure 2 The waterproof sealing kit includes a first sleeve 410 and a second sleeve 420. The first sleeve is provided with an internal thread section 411, an external thread section 412 and an inner core constraint section 413. The second sleeve is screwed onto the external thread section. A PU tube is tightly inserted into the annular gap between the second sleeve and the inner core constraint section. The internal thread section is waterproofly screwed onto the inner end of the first sleeve or the second sleeve and is also fitted with a sealing ring 20.

[0027] See Figure 5 Specifically, the inner core is also wrapped with two sections of heat shrink tubing 230. One heat shrink tubing is distributed in the first mounting cavity and the corresponding waterproof sealing kit, while the other heat shrink tubing is distributed in the third mounting cavity and the corresponding waterproof sealing kit. When the waterproof sealing kit experiences minor water leakage, the heat shrink tubing can still provide a certain degree of waterproofing.

[0028] See Figure 1 and Figure 5 The male connector has a central positioning section 124 extending into the first mounting cavity. The female connector, inner core, and central positioning section are screwed together. The connection between the central positioning section and the male connector forms a limiting step 125. The outer end of the insertion cavity is provided with an internal hexagon. The male connector is provided with a double-sided clamping part for easy tool clamping and positioning, or it can be an external hexagon structure.

[0029] Specifically, both the first and second positioning rings have porous structures to enable fluid conduction between the two sides.

[0030] See Figure 5 Specifically, a 304 stainless steel metal ring 140 is fitted on the outside of the insertion cavity area of ​​the first sleeve to enhance the strength of the first sleeve and prevent cracking.

[0031] The specific installation process in this embodiment is as follows:

[0032] First, fit the two heat shrink tubes onto the corresponding parts of the inner core and heat shrink them to fix them in place. 12mm of the inner core should be exposed at both ends. Then screw one end of the inner core to the male connector.

[0033] The second step is to place the sealing rings on the preset positions of the two sleeves and apply grease to the outer wall of the mating section.

[0034] The third step is to fit the metal ring onto the outer wall of the first sleeve;

[0035] The fourth step is to put the first positioning ring on the first sleeve, spray an accelerator on the sleeve joint, then screw on the lock nut to completely fix the first sleeve, and apply thread-locking adhesive to the screw joint.

[0036] Fifth step, connect and fix the two sets of waterproof sealing kits to the PU tube, insert the end of the PU tube into the inner core constraint section of the first screw sleeve, then tighten the first and second screw sleeves, and apply thread sealant to the screw joint.

[0037] Step 6: Screw the two first sleeves onto the first sleeve and the second sleeve, apply thread-locking adhesive to the screw joint, and spray an accelerator onto the sealing ring.

[0038] Step 7: Pass the inner core through the first sleeve, PU tube and second sleeve in sequence, and then press the center positioning section of the male connector into the first mounting cavity until it abuts against the limiting step.

[0039] Step 8: Install the second positioning ring onto the corresponding part of the drill rod 40 and fix its position with the snap ring 30;

[0040] Step 9: Insert the second sleeve from the other end of the drill rod, and drive the PU tube through the drill rod until the second sleeve is engaged with the second positioning ring. Then adjust the position of the first positioning ring so that it engages with the corresponding position on the drill rod, and screw on the lock nut to completely fix the second sleeve and the second positioning ring. Apply thread-locking adhesive to the screw joint.

[0041] Step 10: Apply grease to the outside of the female connector, insert it into the second mounting cavity, and tighten the female connector and inner core.

[0042] It will be apparent to those skilled in the art that the present invention can be modified in various ways, and such modifications are not considered to depart from the scope of the invention. All such modifications that are obvious to those skilled in the art are included within the scope of the claims.

Claims

1. A signal transmission device used in coal mine drilling, comprising a male connector module, a transmission line and a female connector module, characterized in that: The male connector module is composed of a first sleeve, a male connector and a first positioning ring, the first sleeve has an insertion cavity and a first mounting cavity formed in the inside thereof and penetrating through both ends of the first sleeve, the male connector has a plurality of contact springs protruding outward from the circumferential outer wall of the male connector, the male connector is fixed in the insertion cavity and defines an annular hollow cavity, and the first positioning ring is fixed on the outer wall of the first sleeve; The female connector module is composed of a second sleeve, a female connector and a second positioning ring, the second sleeve has a second mounting cavity and a third mounting cavity formed in the inside thereof and penetrating through both ends of the second sleeve, the second sleeve has a connecting section formed at the outer end thereof and having an outer contour adapted to the inner contour of the insertion cavity, the female connector is fixed in the second mounting cavity, and the female connector has an insertion cavity adapted to the male connector at the outer end thereof; The transmission line is composed of an inner core and an isolation layer, one end of the inner core is fixedly connected to the male connector through the first mounting cavity, the other end of the inner core is fixedly connected to the female connector through the third mounting cavity, the first sleeve and the second sleeve are both provided with a waterproof sealing assembly between the first sleeve and the second sleeve and the transmission line to prevent water from flowing into the first mounting cavity and the third mounting cavity, and a plurality of sealing rings are sleeved on the inner wall of the insertion cavity or the outer wall of the connecting section.

2. The signal transmission device for use in coal mining drilling according to claim 1, characterized in that: The contact sleeve is fixedly sleeved on the circumferential outer wall of the male connector, and the contact springs are arranged on the contact sleeve; the contact sleeve and the outer surface of the male connector are both provided with a gold plating layer.

3. The signal transmission device for use in coal mining drilling as claimed in claim 2, characterized in that: The contact sleeve is divided into a first sleeve ring, a second sleeve ring and a plurality of contact springs connected between the two sleeve rings, and the contact springs have a semicircular structure protruding outward.

4. The signal transmission device for use in coal mining drilling according to claim 1, characterized in that: The isolation layer is a PU tube, the waterproof sealing assembly includes a first rotating sleeve and a second rotating sleeve, the first rotating sleeve is provided with an inner threaded section, an outer threaded section and an inner core restraining section, the second rotating sleeve is screwed on the outer threaded section, the PU tube is tightly inserted into the annular gap between the second rotating sleeve and the inner core restraining section, and the inner threaded section is waterproofly screwed on the inner end of the first sleeve or the second sleeve.

5. The signal transmission device for use in coal mining drilling according to claim 4, characterised in that: Two heat-shrinkable tubes are further wrapped on the inner core, one of the heat-shrinkable tubes is arranged in the first mounting cavity and the corresponding waterproof sealing assembly, and the other heat-shrinkable tube is arranged in the third mounting cavity and the corresponding waterproof sealing assembly.

6. The signal transmission device for use in coal mining drilling according to claim 1, characterized in that: The male connector extends a center positioning section partially inserted into the first mounting cavity, the female connector, the inner core and the center positioning section are in screwing cooperation with each other.

7. The signal transmission device for use in coal mining drilling as claimed in claim 1, characterized in that: The first positioning ring and the second positioning ring both have a porous structure.

8. The signal transmission device for use in coal mining drilling according to claim 1, characterized in that: A metal ring is sleeved on the outside of the first sleeve corresponding to the region of the insertion cavity.

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