56 results about "Prevention problems" patented technology

The invention discloses a drilling-cutting-linked coal layer gas drainage and outburst prevention system and method based on ultra-long drilling and high-pressure water jetting. The system comprises a drill bit, a pressure sensing valve, a drill stem, a drill machine, a high / low-pressure water delivery and rotation device, a high-pressure pump and a water tank, wherein the pressure sensing valve is mounted at the front end of the drill stem; the drill bit is mounted at the front end of the pressure sensing valve; a nozzle is mounted at the outer side of the pressure sensing valve; the drill machine drives the drill stem to rotate; and water in the water tank is delivered to the high / low-pressure water delivery and rotation device through the high-pressure pump, input to the drill stem through the high / low-pressure water delivery and rotation device and delivered to the pressure sensing valve through the drill stem. In the drill withdrawing process, the coal layer is cut by the high-pressure water, thereby realizing the drilling-cutting linkage and improving the working efficiency. The invention is simple and delicate in structure; and by using the invention, the cutting diameter can be up to 3 meters or above, thereby increasing the gas exposure area to more than 6 times of the traditional gas exposure area and effectively widening the gas release range by more than 3 times. Thus, the invention solves the drainage and outburst prevention problems of coal mine gas.

The invention provides a data line interface, portable equipment and a method for connecting the data line interface with the portable equipment. The portable equipment comprises a data slot used for connecting an external data interface, a movable baffle arranged at the opening of the data slot and used for sealing the opening, a limiting mechanism connected with the movable baffle and used for limiting the movable baffle from moving, a sensor arranged corresponding to the data slot, and a control unit of which an input end is connected with the sensor and an output end is connected with the limiting mechanism, wherein the control unit is used for driving the limiting mechanism to drive the movable baffle to move away from the opening of the data slot when sensing that the external data interface wants to be plugged into the data slot. The data line interface comprises a plug corresponding to the data slot of any of portable equipment mentioned above, as well as an insulation part covering the plug. The invention effectively solves the waterproof and dust-prevention problem of the slot.

The invention discloses a lock. The lock comprises a key, a lock cylinder jacket, a lock cylinder, a lock bolt, a blade, a blade hole, a locking piece and a limiting piece, wherein the blade hole is formed by combining a plurality of square grooves formed in the lock cylinder in the radial direction with the other half of cylinder; the limiting piece is L-shaped and provided with two trapezoidal bulges and two cylinders; two trapezoidal grooves mutually matched with the trapezoidal bulges of the limiting piece are formed in the lock bolt; two guide holes are formed in the locking piece; at least two blade locking grooves are formed in the side where the blade is coordinated with the lock bolt; the matched key comprises a sliding groove a and a sliding block which are arranged on a key rod; the sliding groove and the sliding block are arranged between a handle and key teeth. The limiting piece can release the limiting on the locking bolt only when the blade is locked by the locking piece and cannot move, and during the unlocking and pulling process, the lock bolt is always not in contact with the blade, so that the technical unlocking prevention problem is fundamentally solved.

The invention discloses an LT type elastic sleeve pin coupling. The coupling includes a left half-coupling, a right half-coupling, multiple fastening pins, multiple fastening nuts and multiple elasticsleeves. A surface where the left half-coupling and the right half-coupling are in contact is provided with a matching positioning device, which facilitates assembly and positioning and effectively solves the problem of wrong mounting. An integral shock absorbing pad is arranged between the left half-coupling and the right half-coupling, A shockproof sleeve and a shockproof washer are arranged onthe positioning device surface, which strengthens the shockproof performance of the coupling. In addition, the connecting surface side of the left half-coupling of the coupling is also provided withan oil filling hole communicating with a shaft hole so as to oil for rust prevention. The LT type elastic sleeve pin coupling has the advantages of simple structure, reasonable arrangement and low manufacturing cost, effectively reduces the wear and rust prevention problem between a coupling shaft and the hole, and has good use value.

The invention relates to an eyesight improving tea, which comprises the following effective components by weight part: 14-17 parts of cassia occidentalis, 17-21 parts of semen cuscutae, 16-19 parts of milkvetch seed, 13-15 parts of onion seed, 13-16 parts of semen celosiae and 12-27 parts of chrysanthemum. The preparation method comprises the following steps: cleaning cassia occidentalis, semen cuscutae, milkvetch seed, onion seed and semen celosiae and then rolling, drying for later usage, uniformly mixing the above raw materials and chrysanthemum, split charging into small bags to obtain the product. The eyesight improving tea has the efficacies of clearing liver and improving eyesight, and is suitable for drinking by people with eyesight prevention problem.

The invention provides an identity authentication method, identity authentication equipment, a server and an identity authentication-based encryption method and aims to solve the counterfeiting and repudiation prevention problems of identity authentication. The method comprises the following steps of: combining a written signature with a digital signature; acquiring the written signature handwriting of a user through the identity authentication equipment such as a universal serial bus (USB) key; combining the written signature handwriting with transaction data and performing digital signing; and transmitting signature data and the encrypted written signature handwriting to a verification party (such as an Internet bank background system). The signature data is verified by the verification party, so that the written signature handwriting and confidentiality data are not tampered in a transmission process; simultaneously, the truth of the written signature handwriting is verified by the verification party, so that the signature of the written signature handwriting by a user is ensured.

The invention relates to a mining voltage type high-voltage explosion-proof frequency converter. The mining voltage type high-voltage explosion-proof frequency converter comprises a shell, wherein a plurality of reinforcing ribs are arranged on the outer wall and the inner wall of the shell; a plurality of clapboards are arranged in the shell, and partition the internal space of the space into a primary circuit chamber, a secondary circuit chamber and a water-cooling system chamber. The mining voltage type high-voltage explosion-proof frequency converter further comprises a water-cooling device, wherein the water-cooling device comprises an internal portion and an external portion; the internal portion is arranged in the water-cooling system chamber; the external portion is arranged outside the shell; the internal portion comprises an explosive-proof valve, a water distribution pipe and a water return pipe; the external portion comprises a radiator, an deionization exchanger and a pump unit. The mining voltage type high-voltage explosion-proof frequency converter has the beneficial effects that the explosion prevention problem during application of a voltage type high-voltage frequency converter under a coal mine is solved, and the problem of heat dissipation of a unit type structure is solved successfully. Through a water-cooled matched cabinet which is consistent with an explosion-proof standard, a plurality of water-cooling systems can be used at the same time, and a quick response can be made to failure of a cooling portion.

The invention discloses a hidden lock which comprises a supporting column connected with a suitcase. The middle of a lock sleeve is fixed to the top end of the supporting column. The lock sleeve is of a hollow structure. A tapered end is inserted into the left side of the lock sleeve, and the front portion of the tapered end stretches into the lock sleeve. A circular plate is arranged at the tail of the tapered end. A tapered end supporting column is connected to the back face of the circular plate. A spring wire is connected to the tail of the tapered end supporting column. The right end of the lock sleeve is fixed by the tail end of the spring wire. On the basis of elasticity of the spring wire, when the hidden lock does not need to be used, the tapered end can be automatically retracted into a handle of a pull rod, and normal use of the handle will not be affected; when the hidden lock needs to be used, the tapered end is pulled out and inserted into a tail lock; a coded lock is adopted at the tail of the tapered end, carrying is convenient, a user just needs to remember a password when using the hidden lock, and the hidden lock has good practicability. The structure is attractive in appearance and symmetric in structure, has the good market prospect, and solves the problems that an existing suitcase has a single anti-theft function, emphasis is laid on theft prevention of the position of a zipper and the theft prevention problem of the suitcase is neglected.

The invention provides an underground station exit and entrance structure and a construction method thereof, and belongs to the field of rail transit. The underground station exit and entrance structure comprises a bottom plate, a top plate and side walls; the bottom plate comprises a sinking section, a climbing section and a horizontal passage section, wherein the sinking section is positioned below the elevation line of the maximum scouring depth, and a retaining wall capable of forming a closed structure is arranged between the sinking section and the ground; and a supporting surface is arranged between the retaining wall and the sinking section. According to the underground station exit and entrance structure and the construction method thereof, the sinking section, close to the ground, of the bottom plate of the exit and entrance structure is arranged below the elevation line of the maximum scouring depth, and the retaining wall capable of forming the closed structure is arrangedbetween the sinking section and the ground, so that the erosion prevention problem of the exit and entrance structure under a flood working condition is effectively solved, the situation that the bottom plate structure is disengaged and cantilevered due to a soil body under the bottom plate of a conventional exit and entrance structure being scoured by water flow under the maximum scouring depth is avoided, the safety of the exit and entrance structure is ensured, and the underground station exit and entrance structure and the construction method thereof can be applied to the construction of underground stations around flood flowing areas or flood discharge rivers.