43results about How to "Prevent closure" patented technology

The invention discloses a pressure-controlled drainage gas production method and system for a coal-bed gas well. The pressure-controlled drainage gas production method comprises the steps that drainage is conducted through the first daily drainage amount, wherein the first daily drainage amount meets the eliminating demand for production interference objects in a coal bed; and a pressure-supplementing medium is injected while drainage is conducted, and the downhole flow pressure daily drop amount is maintained as a first differential pressure value so as to avoid retracting and closing of pores and cracks in the coal bed. According to the pressure-controlled drainage gas production method for the coal-bed gas well, the drainage speed at the drainage state can be conveniently determined, the eliminating demands for drilling and completion fluids, pulverized coal and slack coal in the coal bed can be met, and meanwhile, retracting and closing of the pores and the cracks in the coal bed can also be avoided; and compared with the prior art, the pressure-controlled drainage gas production method is simple in process, the production efficiency of the coal-bed gas well can be greatly improved, and quite high practical value and popularization value are achieved.

The invention discloses a method for manufacturing a rigid-flex printed circuit board with a crossed surface flexible layer, which comprises the following steps of: taking a double-sided flexible copper-clad plate, manufacturing a copper layer and an insulating medium layer on one surface of the double-sided flexible copper-clad plate to form a groove body, forming an etching and ablation groove, distributing the groove body corresponding to the edge of a flexible board area, attaching a cover film in the range of the groove body, and forming an upper flexible board and a lower flexible board, manufacturing a rigid core plate layer and prepregs, stacking and laminating to form a laminated plate, manufacturing an outer layer circuit pattern, and then forming to form the rigid-flexible combined plate; optionally, a windowing rigid core plate and a windowing prepreg are manufactured, one layer of flexible plate is stacked and pre-pressed to form a groove body structure, a release pad is arranged in the groove body, and the other layer of flexible plate is stacked and pressed to form a pressed plate; the etching and ablating groove is formed in the flexible plate, it is guaranteed that the problem that the flexible plate is difficult to mill during forming is solved, the mode that the release pad is arranged is selectively adopted to replace the mode that the flexible plate is broken off after depth-controlled milling, and the machining quality and precision of the plate body are effectively improved.

The fireproof valve with the electric auxiliary reset function comprises a fireproof valve body, an actuator and an auxiliary controller, the top of the fireproof valve body is connected with a mounting plate, the top of the mounting plate is connected with two sets of hanging rings, the two sides of the fireproof valve body are each provided with an air inlet and outlet connector, and the air inlet and outlet connectors are connected with the actuator. A driving blade and two sets of driven blades are arranged in the air inlet and outlet connector, the driving blade is located in the center of the air inlet and outlet connector, the two sets of driven blades are arranged on the upper side and the lower side of the driving blade correspondingly, and the actuator is connected to one side of the fireproof valve body. The auxiliary controller is connected to the side, away from the fireproof valve body, of the actuator, a pull ring is arranged below the actuator, a pull rope is connected between the actuator and the pull ring, after a fire behavior is over, the fireproof valve can be assisted to reset, the resetting process is safer and simpler, and when no fire behavior exists, the fireproof valve can be reset through the pull rope. And the fire damper is prevented from being closed due to misoperation.

The embodiment of the application provides a handle structure and equipment, and relates to the field of communication equipment. The handle structure comprises at least one handle base, the handle base is used for being connected with the equipment; a handle, the handle is rotationally connected with the handle base, and the handle is provided with a buffer; a damping member, the damping member is arranged on one side of the handle base and located between the handle and the handle base; the damping member is configured to rotate the handle relative to the handle base, the buffer moves relative to the handle base, and the damping member provides rotation damping for the handle when switching between the closed position or the open position. The handle can be rotated to the position (such as the closed position) of being attached to the shell of the equipment, so that the occupied space in the non-use state is reduced. The damping member provides rotation damping for the rotation of the handle, plays a buffering and hovering role, and reduces noise and impact.

The invention relates to the technical field of charging management, and provides an AC charging pile relay protection control method, a charging pile and a storage medium. The control method comprises the steps that under the condition that it is monitored that the charging pile is switched from a charging state to a preparation state, a main relay of the charging pile is controlled to be cut off, and under the condition that a charging gun is not pulled out of a target vehicle, waiting time is started to be calculated; and when it is monitored that the working state of the charging pile is switched from the preparation state to the charging state and the waiting duration which does not reach the first duration threshold exists, the main relay is not controlled to be closed. By adopting the technical scheme, whether the main relay is controlled to be closed or not can be determined on the basis of whether the duration of switching the charging pile from the charging state to the preparation state last time reaches the first duration threshold value or not under the condition that the working state of the charging pile is monitored to be switched from the preparation state to the charging state; in this way, frequent switching-off and switching-on of the main relay can be avoided, and then relay damage to the charging pile can be avoided.

The invention relates to the technical field of indoor evaluation systems and evaluation methods of a fracturing transformation technology, and discloses a supercritical CO2 fracturing fluid in-situ rheology and visual crack sand-carrying experiment system and method. The experimental system comprises a supercritical CO2 high-pressure phase balance unit, a high-pressure capillary viscosity testing unit, a high-pressure visual dynamic sand-carrying testing unit and a data acquisition and analysis unit. The experimental method comprises capillary viscosity testing and dynamic sand-carrying performance testing. According to the scheme, the sand-carrying experiment and the viscosity experiment are combined, the sand-carrying experiment is used for testing the migration conditions of the supercritical CO2 fracturing fluid obtained by different formulas under different simulated temperatures and pressures, and the viscosity experiment is used for testing the viscosity of the supercritical CO2 fracturing fluid obtained by different formulas, evaluating the friction resistance of the supercritical CO2 fracturing fluid and optimizing the rheological property of the fracturing fluid, so that the friction resistance is reduced, and the fracturing efficiency is improved. Energy consumption is reduced, and operation efficiency is improved.

This utility model discloses a four-part mold, relating to the field of mold technology. It includes a base, a bottom mold on top of the base, a top mold on top of the bottom mold, a limiting component between the bottom mold and the top mold, and a feeding component on top of the top mold. The limiting component includes a limiting shaft, which is located on one side of the top mold. During injection molding, the raw material is smoothly conveyed from the injection port to the feeding port, then sequentially enters the distributor, passes through the conveying pipe to the discharge port, and is finally precisely delivered into the four different cavities of the inner mold for forming. This ingenious design using a four-part mold, compared to a single-part mold, can more evenly distribute the ejection force during the ejection process after product molding, effectively reducing damage to the product caused by the ejection operation, improving product qualification rate, reducing production costs, and enhancing production efficiency and product quality stability.

The invention provides an end cover assembly, an energy storage device and a power utilization system. The end cover assembly comprises a top cover, the top cover is provided with a first surface and a second surface which are oppositely arranged, the top cover is provided with an anti-explosion hole, and the anti-explosion hole penetrates through the first surface and the second surface; the explosion-proof assembly is arranged on the top cover and seals the explosion-proof hole; the lower plastic cement is arranged on the second surface side of the top cover, the lower plastic cement comprises a plastic cement part, a fence part and a boss, the plastic cement part is connected with the fence part, and the orthographic projection of the fence part on the second surface at least covers part of the explosion-proof hole; the fence part is provided with an open hole and a first exhaust hole, the open hole is closer to the plastic part than the first exhaust hole, the open hole is communicated with a space between the explosion-proof assembly and the fence part and a space of one side, deviating from the top cover, of the lower plastic part, and the first exhaust hole is communicated with a space between the explosion-proof assembly and the fence part and a space of one side, deviating from the top cover, of the lower plastic part; the boss is convexly arranged on the surface, deviating from the top cover, of the plastic part and connected with the fence part.

The utility model relates to a device for fixing a tree shrew in visual intervention and examination operation of an ophthalmic experiment, and belongs to the technical field of animal experiment research instruments. The bottom of one end of a head fixer is provided with an opening, and the other end of the head fixer is connected with a trunk fixer which is communicated with the head fixer; a space defined by the head fixator and the trunk fixator is an operation area, gas exchange channels are distributed in the head fixator, and eye exposure channels, first fixing rope preformed holes, second fixing rope preformed holes and third fixing rope preformed holes are distributed in the trunk fixator. The tree shrew fixing device has the advantages that the tree shrew can be firmly fixed through the rope or the binding belt and the trunk fixing device part, the fixing effect is further enhanced through a full-surrounding structure, and the situation that the tree shrew escapes due to unforeseen circumstances is prevented. Manual grabbing is replaced, experimenters are prevented from being scratched or bitten, and in addition, the stability of the head is guaranteed for the problem that the head of the tree shrew shakes.

This utility model discloses an automatic sprinkler curing device for cap beams, relating to the field of cap beam construction technology. It includes a bottom support clamp, a support frame, and a sprinkler module. The sprinkler module is connected to an automatic water supply module. The bottom support clamp is clamped to the outer surface of the upright support column. The support frame is M-shaped, with a first slot and a second slot for respectively securing two upright support columns. Two first clamping rods are provided and respectively installed and fixed in the first and second slots. Two second clamping rods are provided and respectively detachably installed at the opening positions of the first and second slots. This utility model utilizes the bottom support clamp to install the support frame and sprinkler module under the cap beam. The automatic water supply module intermittently supplies water to the sprinkler module, achieving intermittent automatic sprinkler spraying and improving the degree of automation. The support frame and sprinkler module can be inserted horizontally directly below the cap beam rather than diagonally below, thereby achieving comprehensive sprinkler spraying of the cap beam's bottom surface and avoiding sprinkler dead zones.

The present invention relates to a cardiopulmonary cerebral resuscitation device, the structure of which includes a back plate, a support adjustment frame installed on the back plate, a breathing arm and a circulation arm installed on the support adjustment frame, and an ice cap placed on the device. The cardiopulmonary cerebral resuscitation device has three major functions, namely chest compression, breathing support and hypothermic brain protection. The circulation arm is used for performing cardiac compression to achieve cardiac resuscitation, the breathing arm is used for ventilating the lungs to achieve pulmonary resuscitation, and the ice cap is used for cooling the brain to achieve brain protection. The three parts are used in combination, and with or without power supply and with or without air source conditions, appropriate chest compression, lung ventilation and brain cooling protection can be performed on patients, so that patients can resume oxygen supply and reduce the oxygen demand of the brain, reduce or even avoid damage caused by hypoxia, and maximize the survival rate of patients with cardiac arrest.

The embodiment of the present application provides a kind of voltage transformer secondary circuit protection control method and device, the method comprises: the current data of voltage transformer secondary circuit is collected in real time;The first judgment is carried out to the current data, and first judgment result is obtained;When first judgment result is characterized by passing, the second judgment is carried out to the current data, and second judgment result is obtained;When the second judgment result is characterized by passing, accumulated sampling data is cleared;The first judgment, second judgment are used to judge whether the voltage transformer secondary circuit generates different current fault.The voltage transformer secondary circuit protection control method in the embodiment of the present application can effectively protect voltage transformer secondary circuit, and maintenance efficiency is improved.

The utility model relates to the field of medical instruments, in particular to an oropharynx breather pipe which comprises a flange, a bite block part and a pharynx bending part which are connected in sequence, a vent hole communicated with the bite block part is formed in the flange, the bite block part is made of soft materials, a bite block inner core extending into the bite block part is inserted into the vent hole, and the bite block inner core is made of soft materials. The bite block inner core can be taken out from the vent hole and is made of a hard material. According to the dental pad, the problem that the dental pad part is hard and cannot be suitable for old edentulous patients is solved.

The utility model relates to the field of oral examination, and discloses oral examination auxiliary equipment which comprises a handle, a movable rod, an arc-shaped rod, an odontoscope, a pinching handle, a lantern ring and a tooth supporting mechanism, a cavity is formed in the handle, through holes are formed in the left inner wall and the right inner wall of the cavity, and the movable rod is arranged in the cavity. Compared with the prior art, the oral cavity examination device has the following advantages and effects that when the mouth of a patient is opened to examine the oral cavity, part of upper teeth of the patient bite on the upper tooth cushion, part of lower teeth of the patient bite on the lower tooth cushion, the patient can be effectively prevented from closing the mouth unconsciously, and the fatigue feeling caused by long-time opening of the mouth of the patient can be reduced; furthermore, the distance between the lower tooth cushion and the upper tooth cushion can be conveniently adjusted and changed, the opening degree of the mouth of the patient can be changed, the opening degree of the mouth of the patient can be kept appropriate, and the doctor can conveniently check the oral cavity of the patient.

The invention relates to the technical field of automobile pipe fitting detection, in particular to detection equipment for new energy automobile pipe fitting production, which comprises a mounting frame, a detection barrel, a power unit I and the like, the mounting frame is connected with a detection barrel; a first power unit is connected to the mounting frame. After the hose is immersed in water in the detection barrel, the spherical parts of the two abutting rods abut against the inner wall of the hose, pressure is applied to the inner wall of the hose, the hose is expanded, tiny cracks in the inner wall of the hose are temporarily expanded, therefore, gas is conveniently discharged from the hose, bubbles are generated, the detection efficiency is improved, and meanwhile, the detection accuracy is improved. Pressure is applied to the inner wall of the hose through the spherical portion of the abutting rod, fine cracks in the inner wall of the hose are temporarily expanded, the amount of gas entering water can be conveniently increased, a large number of bubbles can be conveniently generated, observation by workers or a camera instrument is facilitated, and the situation that false detection is easily caused due to the fact that the cracks are fine and the bubbles are not clearly generated is avoided.

The utility model relates to a pipeline arrangement device for nursing. The pipeline arrangement device comprises a support; the mounting seat is connected with the bracket; the long-strip-shaped connecting frames are arranged at the bottom of the mounting base side by side; the pipeline fixing clamp is mounted on the connecting frame in a sliding manner and is used for fixing and arranging pipelines; and the pipeline winding assembly is mounted at one end of the connecting frame and is used for winding the pipeline. Compared with the prior art, the pipeline arrangement device has the advantages that numerous pipelines are effectively arranged, redundant pipelines are wound and wound in order, the anti-slipping performance of the pipelines is improved, the pipeline arrangement efficiency is improved, and the operation and management difficulty of medical staff is reduced.

The utility model discloses a kind of self-adapting elastic waist support mechanism and seat, including pedestal and waist support, elastic member is equipped between pedestal and waist support, elastic member can force waist support always have forward trend;Self-adapting guide structure is equipped between pedestal and waist support, self-adapting guide structure includes the sleeve portion set on one of pedestal and waist support, the sliding fit portion set on the other of pedestal and waist support, the inner hole of sleeve portion is the guide hole extending front and back;Sliding fit portion is inserted in guide hole and forms front and back sliding connection with sleeve portion;By leaving gap between sliding fit portion and sleeve portion, provide certain self-adapting adjustment space for sliding fit portion in guide hole, so that waist support can be deflected after being stressed, and smoothly slide back after deflection, avoid sliding fit portion to form larger extrusion force to guide hole inner wall, reduce the risk of jam when waist support slides, improve the use experience of seat.

The utility model relates to a tree insect-preventing agent spraying device for municipal gardens, which comprises a pesticide box for storing insect-preventing agents, and the pesticide box is arranged on a vehicle body; a supporting frame is installed on the side wall of the pesticide box, the supporting frame is connected to the pesticide box in a lifting mode, an adjusting frame is installed on the supporting frame, a plurality of spray heads are installed on the adjusting frame, the spray heads communicate with the side wall of the pesticide box through telescopic connecting pipelines, and the connecting pipelines are contained in the supporting frame; the adjusting frame is driven by an adjusting device to move relative to the supporting frame. The vehicle body is adopted for moving, and the pesticide box with the large weight and the high height can be borne; the multiple nozzles are supported by the supporting frame, spraying can be conducted without manual holding, meanwhile, the spraying range of the nozzles is expanded through lifting of the supporting frame and movement of the adjusting frame relative to the supporting frame, and the spraying device is more practical.

The utility model relates to the technical field of oil tank, put forward a kind of main oil tank oil level alarm device, the design includes oil tank body, oil tank body upper portion is provided with cover plate subassembly, cover plate subassembly includes the cover plate body of buckling in the upper portion of oil tank body, cover plate subassembly still includes the cross post of fixedly connected in the bottom of cover plate body, cross post outside is provided with oil level monitoring subassembly, oil level monitoring subassembly includes the lower tray of limit sliding in the outside of cross post, the outside of oil tank body is still provided with the alarm component that can cooperate with oil level monitoring subassembly to the oil level height detection and alarm of oil tank body;The design is through cross direction + magnetic attraction sealing design, solved the problem that oil tank float guiding stability is insufficient and sealing is insufficient in the prior art.

This invention provides a food processing machine, including a main unit and a mixing cup detachably mounted on the main unit. The mixing cup contains a pulverizing blade. The main unit has a motor assembly for driving the pulverizing blade to rotate. The main unit includes a main unit housing, which forms a mounting cavity for mounting the motor assembly. The main unit housing has an opening communicating with the mounting cavity. At least a portion of the motor assembly forms the outer surface of the main unit together with the main unit housing through the opening, thereby reducing the size of the main unit, especially its height, making assembly simple and easy to handle.

This invention relates to the field of electrical control technology and discloses a primary and secondary integrated pole-mounted circuit breaker, including a circuit breaker, a support member, a drive member, a connector, and outgoing terminals. The support member is disposed on one side of the circuit breaker, the drive member is located inside the support member, the connector is disposed on the circuit breaker, and the outgoing terminals are located at the top of the circuit breaker. It also includes a limiting assembly disposed on one side of the circuit breaker, comprising an adjusting member, a positioning member, a limiting member, a blocking member, a reset member, and a fixing housing. The adjusting member is disposed on one side of the drive member, and the positioning member is located on one side of the circuit breaker. The beneficial effect of this invention is that by setting the positioning member and the limiting member, the states of the operating lever separating and merging the isolating blades can be fixed respectively, thereby preventing the isolating blades from closing due to worker contact, thus preventing electric shock accidents to workers.

This utility model discloses a sealing ring and sealing device for a railway freight car brake piping system. The sealing ring includes a sealing ring body, a first main lip, a second main lip, and an annular boss. The first main lip is annular, and its root is fixed to the inner surface of the sealing ring body. The second main lip is also annular, and its root is fixed to the inner surface of the sealing ring body. The sealing ring body, the first main lip, and the second main lip form a sealing ring groove. The annular boss is disposed within the sealing ring groove, and its root is fixed to the inner surface of the sealing ring body. The annular boss forms a first lip groove and a second lip groove with the first and second main lip, respectively. An inflation groove is provided on the upper surface of the annular boss. This sealing ring can improve the sealing performance of railway freight car brake piping connections.

The utility model relates to the technical field of financial and accounting equipment, and discloses an adjustable bill fold which comprises a bill fold body, inner plates are fixedly connected to the two sides of the interior of the bill fold body, a channel is formed between the inner plates and the bill fold body, a positioning block is fixedly connected to the interior of the channel, and a spring is fixedly connected to one end of the positioning block. And a movable block is fixedly connected to one end of the spring, a sliding way is formed in the inner plate, a partition plate is fixedly connected to one side of the movable block, a pulley yoke is fixedly connected to the bottom of the partition plate, and a pulley is rotationally connected to the interior of the pulley yoke. Compared with the prior art, the bill fold has the advantages that the multiple partition plates are arranged in the bill fold, then various bills can be clamped in a classified mode, then labels are manufactured on the bills, the labels are placed in the interlayers so as to be convenient to find, the bills can be clamped by moving the partition plates, and the bill fold is simple and convenient to use.

The utility model provides an ultra-smooth nasal feeding tube with a hydrophilic coating, which belongs to the field of medical instruments and comprises a nasal feeding tube body, one end of the nasal feeding tube body is in a pointed cone shape, a hydrophilic component is arranged on one side of the nasal feeding tube body, and a fixing component is arranged outside the nasal feeding tube body. According to the hydrophilic nasal feeding tube, the hydrophilic assembly is arranged, so that the effect of supporting the nasal feeding tube body is achieved; before the nasal feeding tube is used, the nasal feeding tube body is placed in normal saline to be soaked for 30 seconds, the hydrophilic coating made of polyvinylpyrrolidone absorbs water and expands to form the hydrogel layer, when the nasal feeding tube is inserted into the nasal cavity and the throat of a patient, the formed hydrogel layer can greatly reduce the friction coefficient between the outer wall of the nasal feeding tube body and the nasal cavity and the throat of the patient, and discomfort of the patient is reduced; meanwhile, the supporting wire made of the nickel-titanium alloy can improve the stability of the nasal feeding tube body in the bending process, and the situation that the inner cavity of the nasal feeding tube body is completely closed when the patient moves is avoided.

The invention discloses a liquid nitrogen and static crushing agent coupled coal seam fracturing method. The method comprises the following steps: preparing frozen static crushing agent particles by using liquid nitrogen; the frozen static crushing agent particles are injected into the drill hole along with liquid nitrogen, the liquid nitrogen drives the coal body to generate cracks and continuously expand and develop due to the fact that the low temperature and the liquid nitrogen pressure are gradually increased, and the frozen static crushing agent particles flow into the cracks generated by the coal seam along with the liquid nitrogen; after liquid nitrogen fracturing is completed, the temperature of the coal seam is gradually recovered along with the influence of the ground temperature, frozen static crushing agent particles start to dissolve, at the moment, the static crushing agent and water start to generate chemical reaction volume expansion, and then the static crushing agent expands in the crack to form a static crushing agent expansion area to conduct secondary expansion fracturing on the crack; meanwhile, the static crushing agent expansion area supports the crack, the crack is prevented from being closed under the action of ground stress, and coal seam fracturing is completed. By means of the method, efficient fracturing of the coal seam can be achieved, cracks can be effectively supported, and therefore the follow-up closing condition is reduced, and finally the mining efficiency of the coal seam gas is effectively improved.

The invention provides a self-limiting opening and closing hinge and a using method thereof, and belongs to the technical field of hinges, the self-limiting opening and closing hinge comprises a rotary elbow welding part, a limiting welding part and a base welding part, the rotary elbow welding part and the limiting welding part are both hinged to the base welding part, the base welding part is fixed to a loader frame, and the rotary elbow welding part is fixedly connected with a loader hood; the rotating elbow welding part comprises an elbow and a rotating shaft connecting plate, the rotating shaft connecting plate is fixed to the bottom end of the elbow, a first protrusion is arranged on the end face of the outer side of the rotating shaft connecting plate, the limiting welding part comprises a limiting rod and a limiting plate, the limiting plate is fixed to the bottom of the limiting rod, a first groove is formed in the limiting plate, and the first protrusion is arranged in the first groove. And the first bulge and the first groove are correspondingly arranged. Compared with a traditional hinge, assistance can be achieved when a hood is opened, the hood can be limited, the hood is prevented from falling or being closed accidentally when opened, the installation space is saved, and the assembly efficiency can be improved.

The utility model relates to the technical field of handles, in particular to a handle which comprises a belt, and the belt is folded once to form a single ring. The shell is located outside the folded position of the belt, the shell and the belt are connected through a screw and a nut at the joint, a limiting groove is formed in the end, away from the belt, of the shell, a check block is connected to the inner side of the limiting groove in a clamped mode, a lead is connected to one end of the check block, and one end of the lead extends to the outer side of the shell; the belt is folded once to form a single ring, the product thickness at the folding position is reduced, the belt length is reduced, and excessive belt exposure is avoided; a limiting groove is formed in the shell, an external lead is clamped and fixed, and the external lead can be fixedly connected without being wound into a ring.

The utility model discloses an automatic blowing device of an injection molding machine, which relates to the technical field of blowing of injection molding machines, and comprises a fixed mold and a movable mold, gas delivery pipes, gas passing grooves and gas distribution grooves are arranged in the fixed mold and the movable mold, and the gas delivery pipes are communicated through a header pipe to realize uniform gas distribution; the air passing groove is connected with the air conveying pipe, the air distributing groove is formed in the outer side of the air passing groove, a slidable extrusion head is arranged at the tail end of the air distributing groove, and the extrusion head is pushed to stretch out through airflow to apply mechanical thrust to an adhered product; the air separation plate is arranged in the sliding grooves of the fixed mold and the movable mold in a sliding manner, and is matched with the first pressure spring to control the on-off of an air path: during mold closing, the air separation plate is pressed to slide to block the air passing groove; and when the mold is opened, the first pressure spring resets to conduct the gas path. The auxiliary assembly limits displacement of the extrusion head in the injection molding stage through an extension plate and a second compression spring, and the surface flatness of the mold is ensured. The device is of a full-mechanical structure, and efficient demolding is achieved through synchronous control over actions of a gas circuit and a mold in combination with mechanical thrust of an extrusion head.

The utility model discloses a kind of gas promotes extraction system, it is related to coal seam gas extraction technical field, including the water injection gas injection borehole and gas extraction borehole being set in the inside of coal seam, the inside of water injection gas injection borehole and gas extraction borehole is equipped with cement slurry hole sealing material, the side of water injection gas injection borehole is provided with the displacement operation mechanism for carrying out water injection gas injection alternation operation, the side of gas extraction borehole is provided with the gas extraction mechanism for separating gas-liquid.The utility model effectively overcomes the limitation of single displacement mode by alternately injecting water and gas, can displace free gas in coal seam fissure by high-pressure water, then replace gas by using competitive adsorption effect of gas, simultaneously displace water in fissure, form new gas flow path, avoid to close flow path due to the plugging effect of water, cyclic alternation water injection gas injection can expand coal seam fissure network, improve gas extraction rate.

The utility model discloses an energy-saving environment-friendly large-size photovoltaic clock, which structurally comprises a control box, a photovoltaic panel, a photovoltaic clock, a base, a fixing frame and a maintenance box, the photovoltaic clock comprises a collection box, a built-in grid, a pointer ring, a push body, a transparent plate, a digital plate and a middle shaft, the internal space of the collection box is communicated with the built-in grid, the push body is positioned in the built-in grid to move, and the pointer ring is positioned in the middle shaft. When the second hand body moves, the push body rotates in the built-in grid between the transparent plate and the digital plate, and in the moving process of the second hand body, the scraping body of the mosquito entering the built-in grid moves along the sliding way under the gravity of the scraping body, so that the mosquito attached to the surface of the main partition plate is dispelled; when the clock is in use, mosquitoes inside can move towards the collection box below due to space change, so that the clock can continuously emit light in a night mode, meanwhile, the mosquitoes entering the clock can be collected and treated, the mosquitoes are prevented from being continuously sealed inside the clock and even entering gaps, and the situation that the operation effect of equipment is poor is avoided.