A mine flameproof wireless antenna introduction device and installation method thereof

Abstract

The invention discloses a mine flameproof wireless antenna introduction device and an installation method thereof. The device comprises a flameproof sleeve and a sealing and pressing member. A radio frequency cable passes through the sealing and pressing member, a flameproof shell and a flameproof sleeve. The flameproof sleeve comprises a flameproof outer sleeve and a flameproof inner sleeve. The flameproof inner sleeve and the flameproof outer sleeve are connected by flameproof threads. The sealing and pressing member comprises a pressure plate, a sealing cylinder and a sealing pad. The pressure plate, the sealing cylinder and the sealing pad are all extended into the flameproof shell. The radio frequency cable passes through the pressure plate, the sealing cylinder, the sealing pad, the flameproof shell and the flameproof inner sleeve in sequence. Epoxy resin is filled between the radio frequency cable and the flameproof inner sleeve. The method comprises the following steps: 1. Testing of the flameproof outer sleeve and the flameproof inner sleeve; 2. Testing of the sealing and pressing member; 3. Testing of the flameproof shell; 4. Installation of the flameproof sleeve, the sealing and pressing member and the radio frequency cable; 5. Testing of the wireless antenna introduction device. The invention ensures that wireless operation is safe and reliable and can be adapted to mine flameproof equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of explosion-proof equipment, and in particular relates to a mine-used flameproof wireless antenna introduction device and an installation method thereof. Background Art

[0002] With the development of coal mine equipment, in order to improve the reliability and safety of mining equipment, more and more coal mine equipment has adopted wireless control devices to realize wireless control functions and remotely measure the operating parameters and fault status of coal mine machinery. Due to the complex environment of mining equipment and many emergencies, operators need to receive various working parameters of coal mine equipment in a timely manner, discover faults and hidden dangers in time, and take corresponding measures for coal mine equipment. Therefore, a highly reliable and sensitive mining equipment transmitting (receiving) device is needed.

[0003] At present, the following two types of signal transmitting (receiving) devices are generally used: one is to place the signal transceiver antenna on the inner wall of the flameproof shell. Although the antenna is not easily damaged by the outside world in this way, the signal strength of the transceiver antenna is severely attenuated due to the shielding effect of the flameproof shell, which greatly shortens the controllable distance. The other is to transmit signals through the through-wall terminal connected to the mine flameproof shell and the wiring cavity. Since there are generally other control lines at the through-wall terminal, it is easy to affect the wireless signal of the transceiver antenna. Therefore, there is an urgent need for a mine flameproof wireless antenna introduction device and its installation method. The signal attenuation of the wireless antenna is small, the receiving and sending distance of the wireless signal is improved, and the wireless operation is safe and reliable. It has a long service life, is easy to install, and is easy to maintain. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a mine explosion-proof wireless antenna introduction device in view of the deficiencies in the above-mentioned prior art. The device has a reasonable design, small signal attenuation of the wireless antenna, improved sending and receiving distance of the wireless signal, ensured safe and reliable wireless operation, long service life, easy installation, and can be adapted to mine explosion-proof equipment.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a flameproof wireless antenna introduction device for mining, characterized in that: it includes a flameproof sleeve arranged on the inner side of the flameproof shell and a sealing and pressing member arranged on the outer side of the flameproof shell, and the radio frequency cable passes through the flameproof sleeve, the flameproof shell and the sealing and pressing member, the flameproof sleeve includes a flameproof outer sleeve installed on the inner side of the flameproof shell and a flameproof inner sleeve arranged in the flameproof outer sleeve, and the flameproof inner sleeve and the flameproof outer sleeve are connected by flameproof threads;

[0006] The sealing and pressing part includes a pressure plate, a sealing cylinder and a sealing gasket arranged in sequence from the outside to the inside, the sealing cylinder and the sealing gasket are both extended into the flameproof shell, the radio frequency cable passes through the flameproof inner sleeve, the flameproof shell, the sealing gasket, the sealing cylinder and the pressure plate in sequence, and epoxy resin is filled between the radio frequency cable and the flameproof inner sleeve.

[0007] The above-mentioned explosion-proof wireless antenna introduction device for mining is characterized in that: a step hole is arranged on the explosion-proof shell, and the step hole includes a first through hole and a second through hole connected to the first through hole, the inner diameter of the first through hole is larger than the inner diameter of the second through hole, the sealing tube and the sealing gasket are located in the first through hole, the sealing gasket is in contact with the bottom of the first through hole, and the outer side walls of the sealing tube and the sealing gasket are in contact with the inner side wall of the first through hole.

[0008] The above-mentioned explosion-proof wireless antenna introduction device for mining is characterized in that: a wiring through hole is arranged in the explosion-proof inner sleeve, and the wiring through hole includes a first through hole section, a second through hole section and a third through hole section which are connected in sequence, and the inner diameters of the first through hole section, the second through hole section and the third through hole section gradually decrease; a plurality of annular grooves are arranged in the explosion-proof inner sleeve, and the annular grooves are located in the second through hole section; a retaining ring is installed at the connection between the second through hole section and the third through hole section; a limiting boss is arranged at the end of the outer wall of the explosion-proof inner sleeve, and the radio frequency cable passes through the retaining ring.

[0009] The above-mentioned explosion-proof wireless antenna introduction device for mining is characterized in that: an anti-loosening sheet is sleeved on the outer wall of the explosion-proof jacket, and the anti-loosening sheet is located between the limiting boss and the end of the explosion-proof jacket;

[0010] The outer side wall of the flameproof inner sleeve is provided with an outer flameproof thread, and the inner side wall of the flameproof outer sleeve is provided with an inner flameproof thread, and the outer flameproof thread is adapted to the inner flameproof thread.

[0011] The above-mentioned flameproof wireless antenna introduction device for mining is characterized in that: the flameproof outer shell comprises a horizontal mounting portion and a cylindrical portion integrally formed with the horizontal mounting portion and arranged vertically, the horizontal mounting portion is connected to the flameproof housing as a whole through a first bolt, and the internal flameproof thread is located on the inner side wall of the cylindrical portion;

[0012] The pressure plate includes a pressure cover and a boss integrally formed with the pressure cover and arranged vertically, the end of the boss extends into the first through hole, the end of the boss is in contact with the sealing cylinder, and the pressure cover and the boss are provided with a wire hole for the radio frequency cable to pass through;

[0013] The pressure cover is provided with a fixing hole for the second bolt to pass through, and the second bolt connects the pressure plate and the flameproof shell as a whole.

[0014] The above-mentioned explosion-proof wireless antenna introduction device for mining is characterized in that a flexible rubber sleeve is provided at the end of the radio frequency cable outside the explosion-proof jacket, and the length of the flexible rubber sleeve is not less than 1700 mm.

[0015] The above-mentioned explosion-proof wireless antenna introduction device for mining is characterized in that: the sealing cylinder is a nitrile rubber sealing cylinder, and the end of the radio frequency cable located in the explosion-proof jacket is provided with a BNC connector;

[0016] The anti-loosening sheet comprises a collar portion and two vertical portions symmetrically arranged on the collar portion, and two symmetrically arranged first plane portions are arranged on the outer side wall of the end of the flameproof inner sleeve, and the vertical portions and the first plane portions are in contact with each other;

[0017] The horizontal installation portion of the flameproof jacket is provided with two symmetrically arranged second plane portions.

[0018] At the same time, the present invention also discloses a method for installing a mine flameproof wireless antenna introduction device, which has simple steps, reasonable design, convenient implementation and good use effect, and is characterized in that the method comprises the following steps:

[0019] Step 1: Test of flameproof outer jacket and flameproof inner jacket:

[0020] Step 101, testing the flameproof outer jacket and the flameproof inner jacket for 28 days at a temperature of 80° C. and a relative humidity of 90%;

[0021] Step 102, the flameproof outer sleeve and the flameproof inner sleeve are left to stand at room temperature for 24 hours;

[0022] Step 103, testing the flameproof outer jacket and the flameproof inner jacket for 28 days at a temperature of -30°C and a relative humidity of 90%. If the flameproof outer jacket and the flameproof inner jacket are intact, it means that the flameproof outer jacket and the flameproof inner jacket are qualified;

[0023] Step 2: Test of sealing and compression parts:

[0024] Step 201, testing the pressure plate according to the method described in steps 101 to 103 until the pressure plate is qualified;

[0025] Step 202, testing the sealing cylinder and the sealing gasket for 28 days at a temperature of 95° C. and a relative humidity of 93%;

[0026] Step 203, testing the sealing cylinder and the sealing gasket at a temperature of -25°C for 24 hours;

[0027] Step 204, place the sealing cylinder and the sealing gasket in No. 2 oil at a temperature of 50°C for 24 hours, then wipe the sealing cylinder and the sealing gasket dry and leave them at room temperature for 24 hours. If the sealing cylinder and the sealing gasket are intact, it means that the sealing cylinder and the sealing gasket are qualified;

[0028] Step 3: Testing of flameproof enclosure:

[0029] Step 301, at a temperature of 22.7°C, impact the flameproof enclosure with a 1kg hammer, and the flameproof enclosure is intact;

[0030] Step 302, testing the flameproof enclosure in a methane-air mixed environment with a methane volume concentration of 9.3% to 10.3% and a pressure of 0 to 0.416 MPa;

[0031] Step 303, performing a secondary test on the flameproof enclosure in a methane-air mixed environment with a methane volume concentration of 9.3% to 10.3% and a pressure of 0.060 MPa to 0.636 MPa;

[0032] Step 304, filling the flameproof enclosure with a mixture of hydrogen and air, wherein the volume concentration of hydrogen is 54.5% to 55.5%, and igniting the flameproof enclosure under atmospheric pressure. If the flameproof enclosure does not explode, it indicates that the flameproof enclosure is qualified;

[0033] Step 4: Installation of flameproof sleeve, sealing compression parts and RF cables:

[0034] Step 401, installing a flameproof jacket inside the flameproof housing;

[0035] Step 402, installing the flameproof inner sleeve in the flameproof outer sleeve, and at the same time, passing the end of the radio frequency cable extending out of the flameproof inner sleeve through the first through hole and the second through hole on the flameproof shell;

[0036] Step 403: The outer end of the RF cable extending out of the flameproof housing is covered with a sealing gasket, a sealing cylinder and a pressure plate in sequence, and the sealing cylinder and the sealing gasket are extended into the second through hole until the sealing gasket is in contact with the bottom of the first through hole; wherein the outer side walls of the sealing cylinder and the sealing gasket are in contact with the inner side wall of the first through hole;

[0037] Step 404: The second bolt passes through the fixing hole on the gland to connect the gland and the flameproof housing as a whole;

[0038] Step 5: Test of wireless antenna introduction device:

[0039] Step 501: Apply a tensile force of 140N to 180N to the RF cable and maintain it for 6 hours. When the displacement of the RF cable is no more than 6mm and the first bolt and the second bolt are not loose, the RF cable tensile test is qualified.

[0040] Step 502: When a pressure of 2000 kPa is applied to the flameproof housing filling air and maintained for 10 seconds, if no leakage occurs at the installation location of the radio frequency cable, the wireless antenna introduction device is qualified and meets the requirements of mine flameproof.

[0041] The above-mentioned method for installing a flameproof wireless antenna introduction device for mining is characterized in that: in step 402, the flameproof inner sleeve is installed in the flameproof outer sleeve, and the specific process is as follows:

[0042] Step 4021, install a retaining ring at the end of the flameproof inner sleeve, and pass one end of the radio frequency cable through the flameproof inner sleeve and the retaining ring;

[0043] Step 4022, pouring epoxy resin between the radio frequency cable and the flameproof inner sleeve until the surface of the epoxy resin is flush with the end of the flameproof inner sleeve;

[0044] Step 4023, curing the flameproof inner sleeve filled with epoxy resin at room temperature for 7 to 10 days;

[0045] Step 4024, install the flameproof inner sleeve in the flameproof outer sleeve.

[0046] The above-mentioned method for installing a flameproof wireless antenna introduction device for mining is characterized in that after step 404 is completed, the following steps are further performed:

[0047] Step 405, installing a BNC connector at the end of the radio frequency cable located in the flameproof enclosure;

[0048] Step 406: A flexible rubber sleeve is provided at the end of the radio frequency cable outside the flameproof enclosure; wherein the length of the flexible rubber sleeve is not less than 1700 mm.

[0049] Compared with the prior art, the present invention has the following advantages:

[0050] 1. Simple structure, reasonable design, easy installation and long service life.

[0051] 2. The present invention provides a flameproof outer sleeve and a flameproof inner sleeve. On the one hand, the flameproof outer sleeve and the flameproof inner sleeve are connected by flameproof threads to achieve threaded flameproof; on the other hand, an independent flameproof wiring cavity is formed in the flameproof inner sleeve to facilitate the filling of epoxy resin and the laying of radio frequency cables, thereby achieving effective flameproof of the wireless antenna introduction device, so that it can be adapted to mine flameproof equipment.

[0052] 3. The radio frequency cable used in the present invention passes through the flameproof sleeve, the flameproof shell and the sealing compression piece in sequence, so that the end of the radio frequency cable located in the flameproof shell is provided with a BNC connector, which is convenient for transmitting the wireless signal to the wireless signal receiving port of the wireless receiving device inside the flameproof shell; a flexible rubber sleeve is provided at the end of the radio frequency cable located outside the flameproof shell to form a wireless antenna; in addition, the shielding layer of the radio frequency cable is not damaged, the signal attenuation of the wireless antenna is reduced, the receiving and sending distance of the wireless signal is improved, and the anti-interference ability of the wireless introduction device is improved.

[0053] 4. Epoxy resin is filled between the radio frequency cable and the flameproof inner sleeve of the present invention. On the one hand, the purpose is to fix the radio frequency cable after the epoxy resin is cured, so as to cooperate with the sealing and pressing parts to make the radio frequency cable meet the tensile test requirements; on the other hand, the epoxy resin has low shrinkage when cured and generates small internal stress, which improves the adhesion strength on the radio frequency cable. After curing, the epoxy resin has the characteristics of alkali resistance, acid resistance, solvent resistance, heat resistance, high dielectric properties, surface leakage resistance, arc resistance, etc.

[0054] 5. The sealing and pressing member of the present invention includes a pressure plate, a sealing cylinder and a sealing gasket, which are extended into the flameproof casing through the pressure plate, the sealing cylinder and the sealing gasket, and the pressure plate is connected to the outer side of the flameproof casing to seal and press the radio frequency cable, so that the radio frequency cable is not easy to loosen, and the introduction device always presses the sealing cylinder to ensure that the sealing cylinder holds the cable tightly, so that the flameproof effect is stable.

[0055] 6. The present invention provides a sealing cylinder and a sealing gasket, and supports the end face of the sealing cylinder by the sealing gasket, so that the thrust of the pressure plate can be fully transmitted to the sealing cylinder, so that the deformation of the sealing cylinder is uniform, which can not only avoid the damage of the sealing cylinder, but also ensure that the sealing cylinder and the inner wall of the through hole on the flameproof shell are in contact, thereby holding the RF cable tightly and improving the flameproof sealing effect.

[0056] 7. The installation method of the mine flameproof wireless antenna introduction device adopted by the present invention is easy to operate, has good use effect, and ensures safe and reliable wireless operation, and can be adapted to mine flameproof equipment.

[0057] 8. The installation method of the mine flameproof wireless antenna introduction device adopted by the present invention is to first test the flameproof outer sleeve and the flameproof inner sleeve, and then test the sealing clamping parts, and then test the flameproof shell. Then, the flameproof sleeve, the sealing clamping parts and the radio frequency cable are installed on the flameproof shell. After the installation is completed, the wireless antenna introduction device is tested to ensure that the characteristics of the mine flameproof wireless antenna introduction device meet the mine flameproof requirements.

[0058] In summary, the present invention has a reasonable design, the signal attenuation of the wireless antenna is small, the receiving and sending distance of the wireless signal is improved, the wireless operation is ensured to be safe and reliable, and the service life is long and the installation is convenient, and it can be adapted to mine explosion-proof equipment.

[0059] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is a structural schematic diagram of the explosion-proof wireless antenna introduction device for mines of the present invention.

[0061] Figure 2 It is a structural schematic diagram of the pressure plate of the mine flameproof wireless antenna introduction device of the present invention.

[0062] Figure 3 The present invention is a schematic structural diagram of the flameproof inner sleeve of the flameproof wireless antenna introduction device for use in mines.

[0063] Figure 4 The figure is a schematic diagram of the positions of the flameproof outer sleeve, the flameproof inner sleeve and the anti-loosening plate of the flameproof wireless antenna introduction device for mine use of the present invention.

[0064] Figure 5 It is a structural schematic diagram of the anti-loosening piece of the mine flameproof wireless antenna introduction device of the present invention.

[0065] Figure 6 The present invention is a flowchart of the installation method of the explosion-proof wireless antenna introduction device for mines.

[0066] Description of reference numerals:

[0067] 1—flameproof jacket; 1-1—horizontal mounting part; 1-2—cylindrical part;

[0068] 1-3—first bolt; 1-4—second plane portion; 2—flameproof inner sleeve;

[0069] 2-1—External flameproof thread; 2-2—First through hole section; 2-3—Annular groove;

[0070] 2-4—second through hole section; 2-5—limiting boss; 2-6—retaining ring;

[0071] 2-7—third through hole section; 2-8—first plane portion;

[0072] 3—Anti-loosening piece; 3-1—Ring part; 3-2—Vertical part;

[0073] 4—RF cable; 5—epoxy resin; 6—sealing and pressing parts;

[0074] 6-1—Gland; 6-1-1—Wire hole; 6-1-2—Fix hole;

[0075] 6-2—sealing cylinder; 6-3—sealing gasket; 6-4—second bolt;

[0076] 6-5—boss; 7—flexible rubber sleeve; 7-1—cone end;

[0077] 7-2—circular end; 10—flameproof housing; 10-1—first through hole;

[0078] 10-2—Second through hole. DETAILED DESCRIPTION

[0079] like Figure 1A flameproof wireless antenna introduction device for mining is shown, comprising a flameproof sleeve arranged inside a flameproof housing 10 and a sealing and pressing member 6 arranged outside the flameproof housing 10, a radio frequency cable 4 passes through the flameproof sleeve, the flameproof housing 10 and the sealing and pressing member 6, the flameproof sleeve comprises a flameproof outer sleeve 1 installed inside the flameproof housing 10 and a flameproof inner sleeve 2 arranged inside the flameproof outer sleeve 1, the flameproof inner sleeve 2 and the flameproof outer sleeve 1 are connected by flameproof threads;

[0080] The sealing pressing member 6 includes a pressure plate, a sealing cylinder 6-2 and a sealing gasket 6-3 arranged in sequence from the outside to the inside, the sealing cylinder 6-2 and the sealing gasket 6-3 are both extended into the flameproof shell 10, the radio frequency cable 4 passes through the flameproof inner sleeve 2, the flameproof shell 10, the sealing gasket 6-3, the sealing cylinder 6-2 and the pressure plate in sequence, and the space between the radio frequency cable 4 and the flameproof inner sleeve 2 is filled with epoxy resin 5.

[0081] In this embodiment, a step hole is provided on the flameproof shell 10, and the step hole includes a first through hole 10-1 and a second through hole 10-2 connected to the first through hole 10-1, the inner diameter of the first through hole 10-1 is larger than the inner diameter of the second through hole 10-2, the sealing tube 6-2 and the sealing gasket 6-3 are located in the first through hole 10-1, the sealing gasket 6-3 is in contact with the bottom of the first through hole 10-1, and the outer walls of the sealing tube 6-2 and the sealing gasket 6-3 are in contact with the inner wall of the first through hole 10-1.

[0082] like Figure 3 As shown, in this embodiment, a wiring through hole is provided in the flameproof inner sleeve 2, and the wiring through hole includes a first through hole section 2-2, a second through hole section 2-4 and a third through hole section 2-7 which are connected in sequence, and the inner diameters of the first through hole section 2-2, the second through hole section 2-4 and the third through hole section 2-7 gradually decrease, and a plurality of annular grooves 2-3 are provided in the flameproof inner sleeve 2, and the annular grooves 2-3 are located in the second through hole section 2-4, and a retaining ring 2-6 is installed at the connection between the second through hole section 2-4 and the third through hole section 2-7, and a limiting boss 2-5 is provided at the end of the outer wall of the flameproof inner sleeve 2, and the radio frequency cable 4 passes through the retaining ring 2-6.

[0083] like Figure 4 As shown, in this embodiment, an anti-loosening sheet 3 is sleeved on the outer wall of the flameproof jacket 1, and the anti-loosening sheet 3 is located between the limiting boss 2-5 and the end of the flameproof jacket 1;

[0084] The outer side wall of the flameproof inner sleeve 2 is provided with an outer flameproof thread 2-1, and the inner side wall of the flameproof outer sleeve 1 is provided with an inner flameproof thread. The outer flameproof thread 2-1 is adapted to the inner flameproof thread.

[0085] like Figure 2As shown, in this embodiment, the flameproof jacket 1 includes a horizontal mounting portion 1-1 and a cylindrical portion 1-2 integrally formed with the horizontal mounting portion 1-1 and arranged vertically, the horizontal mounting portion 1-1 is connected to the flameproof housing 10 as a whole through a first bolt 1-3, and the internal flameproof thread is located on the inner side wall of the cylindrical portion 1-2;

[0086] The pressure plate includes a pressure cover 6-1 and a boss 6-5 integrally formed with the pressure cover 6-1 and arranged vertically, the end of the boss 6-5 extends into the first through hole 10-1, the end of the boss 6-5 is in contact with the sealing cylinder 6-2, and the pressure cover 6-1 and the boss 6-5 are provided with a wire hole 6-1-1 for the RF cable 4 to pass through;

[0087] The pressure cover 6-1 is provided with a fixing hole 6-1-2 for the second bolt 6-4 to pass through, and the second bolt 6-4 connects the pressure plate and the flameproof housing 10 as a whole.

[0088] In this embodiment, the end of the radio frequency cable 4 outside the flameproof jacket 1 is sleeved with a flexible rubber sleeve 7, and the length of the flexible rubber sleeve 7 is not less than 1700 mm.

[0089] In this embodiment, the sealing cylinder 6-2 is a nitrile rubber sealing cylinder, and the end of the radio frequency cable 4 located in the flameproof jacket 1 is provided with a BNC connector;

[0090] like Figure 5 As shown, the anti-loosening sheet 3 includes a collar portion 3-1 and two vertical portions 3-2 symmetrically arranged on the collar portion 3-1, and two symmetrically arranged first plane portions 2-8 are arranged on the outer side wall of the end of the flameproof inner sleeve 2, and the vertical portion 3-2 and the first plane portion 2-8 are in contact with each other;

[0091] The horizontal installation portion 1 - 1 of the flameproof jacket 1 is provided with two symmetrically arranged second plane portions 1 - 4 .

[0092] In this embodiment, the sealing tube 6 - 2 is a nitrile rubber sealing tube, and the Shore hardness of the sealing tube 6 - 2 is 45° to 55°.

[0093] In this embodiment, a flameproof outer sleeve 1 and a flameproof inner sleeve 2 are provided. On the one hand, the flameproof outer sleeve 1 and the flameproof inner sleeve 2 are connected by flameproof threads, thereby realizing threaded flameproof; on the other hand, an independent flameproof wiring cavity is formed in the flameproof inner sleeve 2, which is convenient for filling with epoxy resin and laying of radio frequency cables, thereby realizing effective flameproof of the wireless antenna introduction device, so that it can be adapted to mine flameproof equipment.

[0094] In this embodiment, the RF cable 4 passes through the flameproof sleeve, the flameproof shell 10 and the sealing compression piece 6 in sequence, so that the end of the RF cable 4 located in the flameproof shell 10 is provided with a BNC connector, which is convenient for transmitting the wireless signal to the wireless signal receiving port of the wireless receiving device inside the flameproof shell, i.e., the shell of the mining flameproof equipment; a flexible rubber sleeve 7 is provided at the end of the RF cable 4 located outside the flameproof shell 10 to form a wireless antenna; in addition, the shielding layer of the RF cable 4 is not damaged, thereby improving the anti-interference ability of the wireless introduction device.

[0095] In this embodiment, epoxy resin 5 is filled between the RF cable 4 and the flameproof inner sleeve 2. On the one hand, the purpose is to fix the RF cable 4 after the epoxy resin is cured, so as to cooperate with the sealing and pressing part 6 to make the RF cable 4 meet the tensile test requirements; on the other hand, the epoxy resin has low shrinkage when cured and generates small internal stress, which improves the adhesion strength on the RF cable 4. After curing, the epoxy resin is resistant to alkali, acid, solvents, and heat, and has high dielectric properties, resistance to surface leakage, and resistance to arcing.

[0096] In this embodiment, the sealing and pressing member 6 includes a sealing tube 6-2 and a sealing gasket 6-3, which extend into the flameproof shell 10 through the sealing tube 6-2 and the sealing gasket 6-3, and the pressure plate fits with the outer side of the flameproof shell 10 to seal and press the RF cable 4 so that the RF cable 4 is not easy to loosen, so that the introduction device always presses the sealing tube, ensuring that the sealing tube holds the cable tightly, so that the flameproof effect is stable.

[0097] In this embodiment, a sealing cylinder 6-2 and a sealing gasket 6-3 are provided, and the sealing gasket 6-3 supports the end face of the sealing cylinder 6-2, so that the thrust of the pressure plate can be fully transmitted to the sealing cylinder 6-2, so that the deformation of the sealing cylinder 6-2 is uniform, which can avoid the damage of the sealing cylinder 6-2 and ensure that the sealing cylinder 6-2 fits with the inner wall of the through hole on the flameproof shell 10, thereby holding the RF cable 4 tightly and improving the flameproof sealing effect.

[0098] In this embodiment, in actual use, one end of the flexible rubber sleeve 7 close to the flameproof housing 10 is a circular end 7 - 2 , and the other end of the flexible rubber sleeve 7 is a frustum end 7 - 1 .

[0099] In this embodiment, it should be noted that the mine flameproof wireless antenna introduction device complies with the underground explosion-proof standards of coal mines and the national standards, is safe and reliable, and solves the problem of severe attenuation of wireless signal strength caused by mine explosion-proof equipment. The introduction device can improve the sensitivity of wireless signal reception and ensure safe and reliable wireless operation within the effective receiving distance. In addition, the radio frequency cable 4 is used as an antenna and can be arranged at any angle, which solves the problem of small incident angle of the wireless signal. The introduction device has a simple structure, can be bent freely, has a long service life, is easy to install, and is easy to maintain.

[0100] like Figure 6 A method for installing a mine flameproof wireless antenna introduction device is shown, the method comprising the following steps:

[0101] Step 1: Test of flameproof outer jacket and flameproof inner jacket:

[0102] Step 101, testing the flameproof outer jacket 1 and the flameproof inner jacket 2 for 28 days at a temperature of 80° C. and a relative humidity of 90%;

[0103] Step 102, the flameproof outer sleeve 1 and the flameproof inner sleeve 2 are left to stand at room temperature for 24 hours;

[0104] Step 103, testing the flameproof outer jacket 1 and the flameproof inner jacket 2 for 28 days at a temperature of -30°C and a relative humidity of 90%. If the flameproof outer jacket 1 and the flameproof inner jacket 2 are intact, it means that the flameproof outer jacket 1 and the flameproof inner jacket 2 are qualified;

[0105] Step 2: Test of sealing and compression parts:

[0106] Step 201, testing the pressure plate according to the method described in steps 101 to 103 until the pressure plate is qualified;

[0107] Step 202, testing the sealing cylinder 6-2 and the sealing gasket 6-3 for 28 days at a temperature of 95°C and a relative humidity of 93%;

[0108] Step 203, testing the sealing cylinder 6-2 and the sealing gasket 6-3 at a temperature of -25°C for 24 hours;

[0109] Step 204, place the sealing cylinder 6-2 and the sealing gasket 6-3 in No. 2 oil at a temperature of 50°C for 24 hours, then wipe the sealing cylinder 6-2 and the sealing gasket 6-3 dry and leave them at room temperature for 24 hours. If the sealing cylinder and the sealing gasket are intact, it means that the sealing cylinder and the sealing gasket are qualified;

[0110] Step 3: Testing of flameproof enclosure:

[0111] Step 301, at a temperature of 22.7° C., impact the flameproof enclosure 10 with a 1 kg hammer, and the flameproof enclosure 10 is intact;

[0112] Step 302, testing the flameproof enclosure 10 in a methane-air mixed environment with a methane volume concentration of 9.3% to 10.3% and a pressure of 0 to 0.416 MPa;

[0113] Step 303, performing a secondary test on the flameproof enclosure 10 in a methane-air mixed environment with a methane volume concentration of 9.3% to 10.3% and a pressure of 0.060 MPa to 0.636 MPa;

[0114] Step 304: filling the flameproof enclosure 10 with a mixture of hydrogen and air, wherein the volume concentration of hydrogen is 54.5% to 55.5%, and igniting the mixture in the flameproof enclosure 10 under atmospheric pressure. If the flameproof enclosure 10 does not explode, it indicates that the flameproof enclosure 10 is qualified.

[0115] Step 4: Installation of flameproof sleeve, sealing compression parts and RF cables:

[0116] Step 401, installing the flameproof jacket 1 inside the flameproof housing 10;

[0117] Step 402, installing the flameproof inner sleeve 2 in the flameproof outer sleeve 1, and at the same time, passing the end of the radio frequency cable 4 extending out of the flameproof inner sleeve 2 through the first through hole 10-1 and the second through hole 10-2 on the flameproof housing 10;

[0118] Step 403, the outer end of the RF cable 4 extending out of the flameproof housing 10 is sequentially covered with a sealing gasket 6-3, a sealing cylinder 6-2 and a pressure plate, and the sealing cylinder 6-2 and the sealing gasket 6-3 are extended into the second through hole 10-2 until the sealing gasket 6-3 is in contact with the bottom of the first through hole 10-1; wherein the outer side walls of the sealing cylinder 6-2 and the sealing gasket 6-3 are in contact with the inner side wall of the first through hole 10-1;

[0119] Step 404, the second bolt 6-4 passes through the fixing hole 6-1-2 on the pressure cover 6-1, and connects the pressure plate and the flameproof housing 10 as a whole;

[0120] Step 5: Test of wireless antenna introduction device:

[0121] Step 501, apply a tensile force of 140N to 180N to the RF cable 4 and maintain it for 6 hours. When the displacement of the RF cable 4 is not greater than 6mm, and the first bolt 1-3 and the second bolt 6-4 are not loose, the tensile test of the RF cable 4 is qualified;

[0122] Step 502: When the flameproof housing 10 is filled with air and a pressure of 2000 kPa is applied and maintained for 10 seconds, if no leakage occurs at the installation of the radio frequency cable 4, the wireless antenna introduction device is qualified and meets the requirements of mine flameproof.

[0123] In this embodiment, in step 402, the flameproof inner sleeve 2 is installed in the flameproof outer sleeve 1, and the specific process is as follows:

[0124] Step 4021, install a retaining ring 2-6 at the end of the flameproof inner sleeve 2, and pass one end of the radio frequency cable 4 through the flameproof inner sleeve 2 and the retaining ring 2-6;

[0125] Step 4022, pouring epoxy resin 5 between the radio frequency cable 4 and the flameproof inner sleeve 2 until the surface of the epoxy resin 5 is flush with the end of the flameproof inner sleeve 2;

[0126] Step 4023, curing the flameproof inner sleeve 2 filled with epoxy resin 5 at room temperature for 7 to 10 days;

[0127] Step 4024: install the flameproof inner sleeve 2 inside the flameproof outer sleeve 1.

[0128] In this embodiment, after step 404 is completed, the following steps are further performed:

[0129] Step 405, installing a BNC connector at the end of the RF cable 4 located in the flameproof housing 10;

[0130] Step 406: A flexible rubber sleeve 7 is provided at the end of the radio frequency cable 4 outside the flameproof housing 10; wherein the length of the flexible rubber sleeve 7 is not less than 1700 mm.

[0131] In this embodiment, the epoxy resin 5 is black epoxy resin AB glue.

[0132] In summary, the present invention has a reasonable design, the signal attenuation of the wireless antenna is small, the receiving and sending distance of the wireless signal is improved, the wireless operation is ensured to be safe and reliable, and the service life is long and the installation is convenient, and it can be adapted to mine explosion-proof equipment.

[0133] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A mine flameproof wireless antenna introduction device, characterized in that: The invention comprises a flameproof sleeve arranged inside a flameproof shell (10) and a sealing and pressing member (6) arranged outside the flameproof shell (10), wherein a radio frequency cable (4) passes through the flameproof sleeve, the flameproof shell (10) and the sealing and pressing member (6), wherein the flameproof sleeve comprises a flameproof outer sleeve (1) installed inside the flameproof shell (10) and a flameproof inner sleeve (2) arranged inside the flameproof outer sleeve (1), and the flameproof inner sleeve (2) and the flameproof outer sleeve (1) are connected by flameproof threads; The sealing and pressing member (6) comprises a pressure plate, a sealing cylinder (6-2) and a sealing gasket (6-3) arranged in sequence from the outside to the inside, the sealing cylinder (6-2) and the sealing gasket (6-3) both extend into the flameproof housing (10), the radio frequency cable (4) passes through the flameproof inner sleeve (2), the flameproof housing (10), the sealing gasket (6-3), the sealing cylinder (6-2) and the pressure plate in sequence, and epoxy resin (5) is filled between the radio frequency cable (4) and the flameproof inner sleeve (2); The flameproof housing (10) is provided with a stepped hole, the stepped hole comprising a first through hole (10-1) and a second through hole (10-2) communicating with the first through hole (10-1), the inner diameter of the first through hole (10-1) being greater than the inner diameter of the second through hole (10-2), the sealing cylinder (6-2) and the sealing gasket (6-3) being located in the first through hole (10-1), the sealing gasket (6-3) being in contact with the bottom of the first through hole (10-1), and the outer side walls of the sealing cylinder (6-2) and the sealing gasket (6-3) being in contact with the inner side wall of the first through hole (10-1); A wiring through hole is provided in the flameproof inner sleeve (2), the wiring through hole comprises a first through hole section (2-2), a second through hole section (2-4) and a third through hole section (2-7) which are connected in sequence, the inner diameters of the first through hole section (2-2), the second through hole section (2-4) and the third through hole section (2-7) gradually decrease, a plurality of annular grooves (2-3) are provided in the flameproof inner sleeve (2), the annular grooves (2-3) are located in the second through hole section (2-4), a retaining ring (2-6) is installed at the connection between the second through hole section (2-4) and the third through hole section (2-7), a limiting boss (2-5) is provided at the end of the outer wall of the flameproof inner sleeve (2), and the radio frequency cable (4) passes through the retaining ring (2-6); The flameproof outer shell (1) comprises a horizontal mounting portion (1-1) and a cylindrical portion (1-2) integrally formed with the horizontal mounting portion (1-1) and arranged vertically, the horizontal mounting portion (1-1) being integrally connected to the flameproof housing (10) via a first bolt (1-3), and an internal flameproof thread is located on the inner side wall of the cylindrical portion (1-2); The pressure plate comprises a pressure cover (6-1) and a boss (6-5) integrally formed with the pressure cover (6-1) and arranged vertically, the end of the boss (6-5) extends into the first through hole (10-1), the end of the boss (6-5) is in contact with the sealing cylinder (6-2), and a wire hole (6-1-1) for the radio frequency cable (4) to pass through is provided in the pressure cover (6-1) and the boss (6-5); The pressure cover (6-1) is provided with a fixing hole (6-1-2) for a second bolt (6-4) to pass through, and the second bolt (6-4) connects the pressure plate and the flameproof casing (10) as a whole.

2. A mine flameproof wireless antenna introduction device according to claim 1, characterized in that: An anti-loosening sheet (3) is sleeved on the outer side wall of the flameproof jacket (1), and the anti-loosening sheet (3) is located between the limiting boss (2-5) and the end of the flameproof jacket (1); The outer side wall of the flameproof inner sleeve (2) is provided with an outer flameproof thread (2-1), and the inner side wall of the flameproof outer sleeve (1) is provided with an inner flameproof thread, and the outer flameproof thread (2-1) is compatible with the inner flameproof thread.

3. A mine flameproof wireless antenna introduction device according to claim 1, characterized in that: The end of the radio frequency cable (4) located outside the flameproof jacket (1) is provided with a flexible rubber sleeve (7), and the length of the flexible rubber sleeve (7) is not less than 1700 mm.

4. A mine flameproof wireless antenna introduction device according to claim 2, characterized in that: The sealing cylinder (6-2) is a nitrile rubber sealing cylinder, and the end of the radio frequency cable (4) located inside the flameproof jacket (1) is provided with a BNC connector; The anti-loosening sheet (3) comprises a collar portion (3-1) and two vertical portions (3-2) symmetrically arranged on the collar portion (3-1); two symmetrically arranged first plane portions (2-8) are arranged on the outer side wall of the end of the flameproof inner sleeve (2); the vertical portions (3-2) and the first plane portions (2-8) are in contact with each other; Two symmetrically arranged second plane portions (1-4) are provided on the horizontal mounting portion (1-1) of the flameproof jacket (1).

5. A method for installing a mine flameproof wireless antenna introduction device, characterized in that: The method comprises the following steps: Step 1: Test of flameproof outer jacket and flameproof inner jacket: Step 101, testing the flameproof outer jacket (1) and the flameproof inner jacket (2) for 28 days at a temperature of 80° C. and a relative humidity of 90%; Step 102, the flameproof outer sleeve (1) and the flameproof inner sleeve (2) are left to stand at room temperature for 24 hours; Step 103, testing the flameproof outer jacket (1) and the flameproof inner jacket (2) for 28 days at a temperature of -30°C and a relative humidity of 90%. If the flameproof outer jacket (1) and the flameproof inner jacket (2) are intact, it means that the flameproof outer jacket (1) and the flameproof inner jacket (2) are qualified; Step 2: Test of sealing and compression parts: Step 201, testing the pressure plate according to the method described in steps 101 to 103 until the pressure plate is qualified; Step 202, testing the sealing cylinder (6-2) and the sealing gasket (6-3) for 28 days at a temperature of 95°C and a relative humidity of 93%; Step 203, testing the sealing cylinder (6-2) and the sealing gasket (6-3) at a temperature of -25°C for 24 hours; Step 204, placing the sealing cylinder (6-2) and the sealing gasket (6-3) in No. 2 oil at a temperature of 50°C for 24 hours, then wiping the sealing cylinder (6-2) and the sealing gasket (6-3) dry and leaving them at room temperature for 24 hours. If the sealing cylinder and the sealing gasket are intact, it means that the sealing cylinder and the sealing gasket are qualified; Step 3: Testing of flameproof enclosure: Step 301, at a temperature of 22.7° C., impact the flameproof enclosure (10) with a 1 kg hammer, and the flameproof enclosure (10) is intact; Step 302, testing the flameproof enclosure (10) in a methane-air mixed environment with a methane volume concentration of 9.3% to 10.3% and a pressure of 0 to 0.416 MPa; Step 303, performing a secondary test on the flameproof enclosure (10) in a methane-air mixed environment with a methane volume concentration of 9.3% to 10.3% and a pressure of 0.060 MPa to 0.636 MPa; Step 304, filling the flameproof enclosure (10) with a mixture of hydrogen and air, wherein the volume concentration of hydrogen is 54.5% to 55.5%, and igniting the mixture in the flameproof enclosure (10). If the flameproof enclosure (10) does not explode, it indicates that the flameproof enclosure (10) is qualified; Step 4: Installation of flameproof sleeve, sealing compression parts and RF cables: Step 401, installing a flameproof jacket (1) inside the flameproof housing (10); Step 402, installing the flameproof inner sleeve (2) in the flameproof outer sleeve (1), and at the same time, passing the end of the radio frequency cable (4) extending out of the flameproof inner sleeve (2) through the first through hole (10-1) and the second through hole (10-2) on the flameproof housing (10); Step 403: The outer end of the radio frequency cable (4) extending out of the flameproof housing (10) is sequentially sleeved with a sealing gasket (6-3), a sealing cylinder (6-2) and a pressure plate, and the sealing cylinder (6-2) and the sealing gasket (6-3) are extended into the second through hole (10-2) until the sealing gasket (6-3) and the bottom of the first through hole (10-1) are in contact; wherein the outer side walls of the sealing cylinder (6-2) and the sealing gasket (6-3) are in contact with the inner side wall of the first through hole (10-1); Step 404: The second bolt (6-4) passes through the fixing hole (6-1-2) on the pressure cover (6-1), thereby connecting the pressure plate and the flameproof casing (10) into one body; Step 5: Test of wireless antenna introduction device: Step 501, applying a tensile force of 140N to 180N to the radio frequency cable (4) and maintaining it for 6 hours. When the displacement of the radio frequency cable (4) is no more than 6mm and the first bolt (1-3) and the second bolt (6-4) are not loose, the radio frequency cable (4) passes the tensile test; Step 502: When a pressure of 2000 kPa is applied to the flameproof housing (10) and the pressure is maintained for 10 seconds, if no leakage occurs at the installation location of the radio frequency cable (4), the wireless antenna introduction device is qualified and meets the requirements of mine flameproof.

6. The method for installing a mine flameproof wireless antenna introduction device according to claim 5, characterized in that: In step 402, the flameproof inner sleeve (2) is installed in the flameproof outer sleeve (1). The specific process is as follows: Step 4021, installing a retaining ring (2-6) at the end of the flameproof inner sleeve (2), and passing one end of the radio frequency cable (4) through the flameproof inner sleeve (2) and the retaining ring (2-6); Step 4022, pouring epoxy resin (5) between the radio frequency cable (4) and the flameproof inner sleeve (2) until the surface of the epoxy resin (5) is flush with the end of the flameproof inner sleeve (2); Step 4023, curing the flameproof inner sleeve (2) filled with epoxy resin (5) at room temperature for 7 to 10 days; Step 4024: Install the flameproof inner sleeve (2) inside the flameproof outer sleeve (1).

7. The method for installing a mine flameproof wireless antenna introduction device according to claim 5, characterized in that: After step 404 is completed, the following steps are performed: Step 405, installing a BNC connector at the end of the radio frequency cable (4) located in the flameproof housing (10); Step 406: A flexible rubber sleeve (7) is provided at the end of the radio frequency cable (4) outside the flameproof housing (10); wherein the length of the flexible rubber sleeve (7) is not less than 1700 mm.

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