52results about How to "Prevent return" patented technology

The utility model provides a ground drilling, grouting and water plugging device suitable for a metal mine, and relates to the technical field of mine water disaster prevention and control, the ground drilling, grouting and water plugging device comprises a petroleum casing pipe, a grouting drill rod, a rubber umbrella cover, a first grouting device and a second grouting device, the grouting drill rod is arranged in the petroleum casing pipe; the rubber umbrella cover is arranged between the oil casing and the grouting drill rod, the grouting drill rod is sleeved with the rubber umbrella cover, and the arrangement height of the rubber umbrella cover is lower than the top end of the oil casing; the first grouting device is fixedly connected with the grouting drill rod through a pressure-resistant steel pipe; the second grouting device is fixedly arranged on the oil casing pipe, and the connecting position of the second grouting device and the oil casing pipe is lower than the bottom end of the rubber umbrella cover. External incoming water of a broken zone of a mining area can be blocked, the water inrush influence of excavation and construction is reduced, the grouting efficiency is improved, the slurry loss is reduced, and the service life of the mining area is prolonged. Therefore, excavation safety is guaranteed, and construction cost is reduced.

The present invention discloses a rotary thermal storage oxidation furnace for waste gas treatment, comprising a furnace body, a gas distributor, a ceramic heat storage mechanism, an igniter, a fan and a controller, the gas distributor comprising an upper partition, a lower partition, a partition cylinder, a central axis, a distribution motor and an electric baffle, the upper partition and the lower partition are horizontally arranged one above the other, an upper air inlet and an upper exhaust port are arranged on the upper partition, a lower air inlet corresponding to the upper air inlet is arranged on the lower partition, the upper and lower ends of the partition cylinder are respectively connected to the upper air inlet and the lower air inlet, the central axis is coaxially connected to the upper partition and the lower partition respectively and is driven to rotate by the distribution motor located below the lower partition, the electric baffle is installed on the top surface of the upper partition and can close the upper air inlet or the upper exhaust port, an exhaust pipe located between the upper partition and the lower partition and an air inlet pipe located below the lower partition are respectively provided on the outer wall of the furnace body, which can effectively improve the treatment quality of VOCs waste gas.

The invention relates to a high-strength modular floor, formed by two or more floor modules securely coupled together. The invention also relates to the floor modules and to a curved connector for securing coupled floor modules together. The high-strength modular floor is versatile, can be adapted for different industrial and commercial uses, and is formed by high-strength floor modules securely coupled together by one or more curved connectors, which restrict relative movement between coupled floor modules along the three Cartesian axes.

An automatic paper core tube pushing device comprises a fixed support, a sliding block, a first guide rail, a pushing plate and a V-shaped groove, and the pushing plate is fixedly connected with the sliding block; a sliding block driving mechanism for driving the sliding block to longitudinally move along the first guide rail is further arranged and comprises an air cylinder, a sliding seat, a second guide rail, a steel wire rope transmission pair and a chain transmission pair, the sliding seat is mounted on the second guide rail, and a piston rod of the air cylinder is in driving connection with the sliding seat; the chain transmission pair comprises a front chain wheel, a rear chain wheel and a chain surrounding the two chain wheels, and the sliding blocks are fixedly connected with chain links of the chain. The steel wire rope transmission pair comprises a steel wire rope, a front guide wheel, a rear guide wheel, a front tensioning wheel, a middle tensioning wheel and a rear tensioning wheel; rotating shafts of the three tensioning wheels are fixedly mounted on the fixed support; rotating shafts of the front and rear guide wheels and rotating shafts of the front and rear chain wheels are also mounted on the sliding seat and longitudinally move along with the sliding seat. The paper core barrel cannot be extruded to deform, and the maximum pushing distance of the air cylinder can be two times of the stroke of the piston rod of the air cylinder.

The present application belongs to the technical field of mooring bitts, and discloses a multifunctional mooring bitt, which comprises a mooring bitt body, a track plate, a tow hook and a deck, two mooring cable division holes are formed in the mooring bitt body, chamfers are arranged on the two sides of the top of the mooring bitt body, and horn-shaped structures are fixedly welded at the chamfers, two eye plates are fixedly welded at one of the legs of the mooring bitt body and are arranged in a vertical mode, a pin shaft is fixedly arranged between the two eye plates, the tow hook is rotatably installed on the pin shaft, a drain pipe is fixedly and continuously connected to the two lower openings of the mooring bitt body, an air duct is fixedly and continuously connected between the side ends of the two lower openings of the mooring bitt body, two longitudinal drain grooves are formed in the mooring bitt body, and lifting assemblies are arranged on the two drain grooves. The mooring bitt is designed in a horn-shaped mode and is integrated with a ring-shaped movable tow hook, and the mooring bitt has the functions of cable guiding, cable towing and cable attaching of the tow cable machine and the tow hook, can satisfy two cable releasing modes of cable releasing upward and cable releasing downward, and has the functions of air ventilation and water drainage.

The invention discloses raw material pool concrete structure anti-cracking raw material preparation equipment and method.The raw material pool concrete structure anti-cracking raw material preparation equipment comprises a raw material smashing device, the raw material smashing device is a ball mill, the ball mill comprises a barrel and steel balls located in the barrel, and the middle of an inner cavity of the barrel is divided into a front cavity and a rear cavity through a partition plate; the steel balls in the front cavity are rough grinding steel balls, the steel balls in the rear cavity are fine grinding steel balls, the side wall of the rear cavity is communicated with a plurality of storage barrels in the circumferential direction, and the side wall of the front cavity is arranged on a guide pipe communicated with the side walls of the storage barrels. The material guide pipe and the material storage barrel which are communicated with the front cavity and the rear cavity are arranged on the barrel of the ball mill, so that raw material particles in the front cavity enter the rear cavity through the material guide pipe and the material storage barrel, raw materials are prevented from returning to the rough grinding section from the fine grinding section, and the speed of the raw materials entering the other grinding section from one grinding section is increased.

The invention relates to the technical field of towel weaving, and provides a method for producing a towel with embossed satin on one side and looped pile on one side and a towel, fuzzing ground warp yarns, fuzzing weft yarns, warp floating ground warp yarns, weft floating weft yarns and wool warp yarns are interwoven, one warp weave cycle comprises wool warp harness wires, fuzzing ground warp harness wires and warp floating ground warp harness wires, the number of the fuzzing ground warp harness wires is two times that of the wool warp harness wires; one weft weave cycle comprises fuzzing weft yarns, floating weft yarns and fuzzing body warp yarns, the fuzzing weft yarns and the wool warp yarns are interwoven to form a looped pile part, and the floating warp body warp yarns, the floating weft yarns and the looped pile part are combined to consolidate plain cloth change weave to form an embossment satin part. According to the technical scheme, the embossed satin is formed by interweaving the special warp and weft float lines and the plain cloth consolidation weave of the looped pile weave, the decorative effect is improved, the occurrence of flat cloth knit defects and creases is avoided, meanwhile, the design requirement for higher looped pile height can be met, the defect of return patterns and knit defects are avoided, and the fabric is more fluffy and softer.

This invention relates to the field of animal husbandry technology and discloses a sealed modular pigsty, including a modular pigsty body, a load-bearing slatted floor, a V-shaped baffle, and an isolation and odor-proof unit. The isolation and odor-proof unit includes an air cushion isolation module, an isolation and odor-proof module, an anti-adhesion module, and a dry and wet separation module. By setting the air cushion isolation module, a horizontal air cushion layer is formed between the load-bearing slatted floor and the V-shaped baffle. The airflow pressure physically isolates heavy odorous gases such as ammonia and hydrogen sulfide produced by manure fermentation, preventing them from flowing back up along the gaps in the slats to the pigs' activity area. At the same time, the air blowing holes guide the airflow downwards to the inclined surface of the V-shaped baffle, pushing the manure and urine attached to the inclined surface downwards, reducing the residence time of manure and urine at the bottom, avoiding the problem of airflow short-circuiting or local negative pressure, and solving the technical problem of odor easily diffusing upwards from the bottom in traditional sealed modular pigsties, leading to a decline in indoor air quality.

The invention provides a material elevator for dairy product processing, and relates to the field of dairy product processing. The material elevator for dairy product processing comprises a support and further comprises a cleaning type feeding assembly, a discharging assembly and a one-way material suction assembly. The cleaning type feeding assembly is fixedly supported by the support, the discharging assembly is connected with the one-way material suction assembly, the one-way material suction assembly is connected with the cleaning type feeding assembly, and the one-way material suction assembly comprises a displacement one-way valve, a reverser, a guide pipe, a middle barrel, a center column and a power assembly. According to the material lifting machine for dairy product processing, by arranging the one-way material suction assembly and the cleaning type feeding assembly, it can be guaranteed that the inner wall of a conveying pipe is clean, dairy products can be completely taken out after being pulled, and the cleanliness of the material lifting equipment can be kept only through simple washing with water in the follow-up process; the U-shaped pipe can isolate the bottom material box from the middle barrel, and it is guaranteed that the interior of the middle barrel is not polluted by the external environment all the time.

The present invention provides a material elevator for dairy product processing, and relates to the field of dairy product processing. The material elevator for dairy product processing comprises a bracket, a cleaning feeding assembly, a material discharge assembly and a one-way suction assembly; the bracket fixedly supports the cleaning feeding assembly, the material discharge assembly is connected to the one-way suction assembly, and the one-way suction assembly is connected to the cleaning feeding assembly, and the one-way suction assembly comprises a shifting one-way valve, a reversing device, a guide pipe, an intermediate barrel, a central column and a power assembly. The material elevator for dairy product processing can ensure the cleanliness of the inner wall of the conveying pipe by arranging the one-way suction assembly and the cleaning feeding assembly, and the dairy products can be completely taken out after pulling. Subsequently, only simple water flushing is needed to keep the material lifting equipment clean. By arranging the material discharge assembly, the U-shaped pipe can isolate the bottom material box from the intermediate barrel, ensuring that the interior of the intermediate barrel is always not polluted by the external environment.

The present invention relates to the field of laser radar technology, and discloses a laser radar scanning head with isolated light receiving and light path, comprising: a transmitting mirror assembly, comprising an output mirror, a receiving mirror surrounding the output mirror, and a first isolation lens barrel and a second isolation lens barrel isolating the output mirror from the receiving mirror and being arranged on both sides of the normal line of the output mirror; the internal spaces of the first isolation lens barrel and the second isolation lens barrel are connected to the surface of the output mirror; a reflector assembly has the same structure as the transmitting mirror assembly; and a window plate assembly, comprising a third isolation lens barrel, an output window plate arranged in the third isolation lens barrel of the reflector assembly, and a receiving window plate arranged outside the third isolation lens barrel, the output window plate forms an acute angle with the central axis of the third isolation lens barrel, the receiving window plate is perpendicular to the central axis of the third isolation lens barrel, the third isolation lens barrel is connected to the first isolation lens barrel of the reflector assembly and is coaxially arranged, so as to prevent the output laser beam from entering the receiving system before exiting the system.

A fluid dispensing system may include a first tank configured to contain a first fluid and a second tank configured to contain a second fluid. The system may also include a conditioning system fluidly connected to the second tank, The conditioning system may include at least one conduit fluidly coupled to a lower region of the second tank. The conditioning system may also include a heat exchanger. In addition, the conditioning system may include at least one conduit fluidly coupled to an upper region of the second tank.

The utility model relates to the technical field of display, and provides a ghosting eliminating circuit and a display device, and the ghosting eliminating circuit comprises a first switching tube which receives a ghosting eliminating control signal to open / close an access of an input voltage access main circuit; the first control unit is used for receiving gate turn-on voltage and connecting the first control unit to a main circuit of the power supply module to form a first discharge path for simulating backflow current between the power supply input port and the input voltage port; and / or a second control unit which receives the gate turn-on voltage and connects the second control unit to a power supply module main circuit to form a second discharge path of the backflow current between the analog power supply input port and the input voltage port. Therefore, the stable power-down state of the input voltage and the shadow elimination control signal when the display device is shut down is maintained. Therefore, false triggering of the XON is effectively prevented, and the problem of shutdown ghost shadow is greatly improved.

The invention provides a text processing method, device and equipment, and belongs to the technical field of artificial intelligence, and the method comprises the steps: receiving a question description text from user equipment; the question description text is matched with first information in a pre-established information base, the first information successfully matched with the question description text is determined as second information, and the first information comprises different cultural backgrounds and social value views; the information base comprises different cultural backgrounds and social values and associated preset interception information; generating a question reply text according to the question description text through a pre-trained text generation model; obtaining preset interception information associated with the second information from an information base, and detecting whether the question reply text represents the obtained preset interception information or not; and under the condition that the question reply text does not represent the acquired preset interception information, returning the question reply text to the user equipment.

This utility model applies to the technical field of environmental protection dust removal equipment in mining, and relates to a single-shaft spiral airlock unloading device for a cage crusher. It includes a drive motor, a U-shaped housing, an inverted U-shaped anti-backflow cover, and a single spiral conveyor shaft. The spiral conveyor shaft is located inside the U-shaped housing and includes a spiral shaft and spiral blades. The drive motor is located outside the U-shaped housing and connected to the spiral conveyor shaft. The drive motor is equipped with temperature and stall sensors. An inverted U-shaped anti-backflow cover is installed at the upper end of the U-shaped housing. Together, they form a compact circular cylindrical space. The discharge port at the tail of the U-shaped housing has a downward inclination. This device has a small overall size, avoids backflow, and has excellent airlock performance.

This invention discloses a refueling pipe assembly with a throttling structure in the field of automotive fuel supply system technology. The assembly includes a refueling pipe and a circulation pipe. The circulation pipe has a throttling structure, which is a locally extruded deformation portion formed on the side wall of the circulation pipe. This deformation portion protrudes inward, forming a throttling orifice with a concave lens-shaped cross-section on the inner side of the pipe wall. An arc-shaped buffer section is provided between the throttling orifice and the outlet end of the circulation pipe. This invention can reduce refueling noise, simplify the throttling orifice process, and improve the reliability of the ORVR system.

This disclosure provides an optical module including a circuit board and an optical emitting component. The circuit board has an insertion port into which the optical emitting component is inserted. The optical emitting component includes a laser component array, which includes laser components. Each laser component includes a first substrate and a laser chip. The laser chip is mounted on the first substrate and is used to emit optical signals. A support plate is formed on the first sidewall of the insertion port, and the support plate is disposed along the length of the circuit board. The support plate and the first sidewall of the insertion port form a placement notch, and the laser component is placed at the placement notch so that the laser component and the support plate are arranged side by side along the width of the circuit board. The laser chip of the laser component is disposed at the end of the first substrate away from the first sidewall of the insertion port. The support plate is provided with signal pads, and the laser chip is directly wire-connected to the signal pads without the need for a transfer through the first substrate, thereby reducing the reflection loss of high-frequency signals and ensuring the high-frequency signal integrity of the optical module.

The present invention relates to a polarization-encoded quantum key distribution system, comprising a transmitting module and a receiving module; the transmitting module comprises a pulse laser, an intensity modulator, a polarization encoder and an electrically adjustable attenuator; the output end of the pulse laser is connected to the input end of the intensity modulator, the output end of the intensity modulator is connected to the input end of the polarization encoder, the output end of the polarization encoder is connected to the input end of the electrically adjustable attenuator, and the output end of the electrically adjustable attenuator is connected to the input end of the receiving module; the receiving module comprises a polarization controller, a polarization decoder, a third polarization beam splitter, a first single-photon detector and a second single-photon detector. The distribution system of the present invention has the advantages of simple system structure and low cost, and avoids attacks on non-ideal beam splitters during passive base selection.

The invention provides a drainage intercepting device, which relates to the technical field of water resource management, and comprises a culvert box, an intercepting mechanism, a chain scraper conveyor, a bucket and a transfer mechanism, the closure mechanism is mounted in the culvert box; a through opening is formed in the top of the culvert box, mounting plates are mounted on the two sides of the top of the through opening, the chain plate conveyor is mounted between the two mounting plates, the top end of the chain plate conveyor extends out of the culvert box, the chain plate conveyor blocks a channel of the culvert box, one side of the chain plate conveyor faces water, and the other side of the chain plate conveyor faces water. The multiple buckets are installed on chain plates of the chain plate conveyor respectively. And the transferring mechanism is used for transferring and receiving the solids excavated by the excavator bucket. The chain scraper conveyor drives the excavator buckets on the chain scraper conveyor to dig solid pollutants in water flow on the upstream side and then convey the solid pollutants to the downstream side, the transfer mechanism receives the solids falling from the excavator buckets, concentrated collection of the solids is completed, unified cleaning of the solid pollutants is facilitated, and the problem that the solids of a traditional drainage facility are scattered and difficult to clean is solved.

Provided are a method for blowing a gaseous reducing agent and a blast furnace tuyere with which it is possible to prevent, in the blast furnace tuyere, a combustion reaction from occurring in the vicinity of a connection part between the tuyere and a blowpipe and a combustion flame that is formed in a raceway space in front of the tuyere from returning to the inside of the tuyere. The method includes blowing the gaseous reducing agent into a blast furnace by using a blast furnace tuyere 10, in which the blast furnace tuyere 10 has a main flow-through hole 12 and a sub flow-through hole 14 that is disposed on an outer side in a radial direction of the main flow-through hole 12, in which a flow speed of an oxygen-containing gas that flows through the main flow-through hole 12 is increased in a tuyere tip part 13 of the main flow-through hole 12, in which the gaseous reducing agent that flows through the sub flow-through hole 14 is converged with the oxygen-containing gas in the tuyere tip part 13 of the main flow-through hole 12 to form a mixed gas, and in which the mixed gas is blown into the blast furnace.

The present application relates to the technical field of suspension conveying, in particular to a hazardous waste hopper suspension conveying and feeding device, which comprises a suspension conveying device, the bottom of the front side of the left side of the suspension conveying device is provided with a positioning and discharging part, the suspension conveying device comprises a suspension conveying guide frame, the outer wall of the suspension conveying guide frame is fixedly connected with inverted L-shaped support legs on multiple sides, and the top of the suspension conveying guide frame is provided with a hopper on multiple sides, the present application is provided with the suspension conveying device and the positioning and discharging part, automatic cleaning of hazardous waste adhered to the inner wall of the hopper is realized, many problems caused by residual waste are effectively solved, in the discharging process, the device can automatically open the discharge port at the bottom of the hopper to complete feeding, residual hazardous waste adhered to the inner wall is vibrated and falls off and discharged through continuous reciprocating knocking actions, the residual waste is prevented from returning to the loading station with the hopper, the loading station equipment is not contaminated, and the health safety and operation precision of the loading area are ensured.

The utility model provides a drain pipe and a refrigerator. The liquid discharge pipe comprises a liquid discharge pipe body with a liquid inlet side and a liquid outlet side; the inner pipe is sleeved with the liquid drainage pipe body, the inner pipe is located on the liquid outlet side and extends towards the liquid inlet side, the liquid drainage pipe body is communicated with the outside of the liquid drainage pipe body through the inner pipe, and the inner pipe comprises a first opening close to the liquid inlet side; the floating body is located in the drain pipe body and movably arranged at the first opening, the floating body comprises a first position and a second position, when the floating body is located at the first position, the floating body blocks the first opening, when the floating body moves to the second position, the floating body suspends above the first opening, and the drain pipe body is communicated with the outside of the drain pipe body through the inner pipe. And the floating body moves from the first position to the second position under the action of liquid in the liquid discharge pipe body. The liquid discharge pipe can prevent external gas from returning into the liquid discharge pipe and has a better sealing effect.

The utility model discloses a drainage device for a water supply and drainage project, which belongs to the technical field of the water supply and drainage project, and comprises a drainage tank, an inner cavity of the drainage tank is provided with a component for preventing peculiar smell from returning upwards, the top of the inner cavity of the drainage tank is clamped with a filter pore plate, and two sides of the bottom of the filter pore plate are respectively provided with a fixing component. The bottom of the drainage tank communicates with a connecting pipe, the bottom of the surface of the connecting pipe is fixedly connected with a flange plate, the odor upward-returning preventing assembly comprises a fixing ring, the surface of the fixing ring is fixedly connected with a sealing ring, and the surface of the sealing ring is in close contact with the inner wall of the drainage tank. The problems that an existing drainage device usually cannot effectively prevent peculiar smell from returning upwards in the drainage process, the environmental air quality is affected, a filtering structure of the existing drainage device is usually fixed through bolts and is inconvenient to disassemble, and inconvenience is brought to cleaning work of workers when the filtering structure is blocked are solved.

The invention relates to the field of medical data privacy protection, in particular to a medical data security outsourcing calculation method based on a block chain and an application system.The method comprises the steps that firstly, system initialization is conducted, a problem provider PP encrypts an LP problem and sends the LP problem to a cloud service provider CSP, meanwhile, the PP generates a problem summary transaction and anchors the problem summary transaction to the block chain, and the problem summary transaction is sent to the block chain; the CSP confirms the integrity of the encrypted LP problem and generates a advance payment compensation transaction, the PP prepays service charges for the CSP by generating a service charge transaction, the CSP solves the encrypted LP problem to obtain an optimization result and sends the optimization result to the PP, the CSP generates an optimization result abstract transaction and anchors the optimization result abstract transaction to a block chain, the PP and a verifier set RV execute double-layer verification on the result, and the PP completes the decryption step according to the verification result. According to the invention, a double-layer verification mechanism and a fair payment protocol are realized based on a block chain technology, and a safe, credible and efficient outsourcing computing system is provided for medical equipment to solve an LP problem under large-scale data.

The utility model belongs to the technical field of rice production, in particular to a bucket elevator winnowing pan for rice production, which comprises a winnowing pan main body, the winnowing pan main body is mounted on a conveyor belt in a matching manner, a baffle is rotatably connected onto the winnowing pan main body, the baffle is connected with a shielding part in a matching manner, and the shielding part is connected onto the winnowing pan main body in a matching manner. According to the bucket elevator winnowing pan for rice production, the baffle is rotationally arranged in the winnowing pan body and matched with the abutting piece and the shielding piece, so that the baffle can be rotationally adjusted on the side, close to the conveying belt, of the winnowing pan body, and the included angle between the top of the baffle and the conveying belt is adjusted according to the use condition; according to the winnowing pan, rice can be conveniently thrown out when the winnowing pan is used for throwing materials, the problem of material returning is avoided, the containing space in the winnowing pan body can be controlled through rotating adjustment of the baffles, and adjustment and use of different quantitative transportation of the rice are met.

The utility model provides a cooking utensil which comprises a pot body, a rice soup collecting box and a cover body, a cooking cavity is formed in the pot body, and the cover body is connected to the pot body and can be operated to open or close the cooking cavity. The cover body is provided with a rice soup channel, the rice soup channel comprises at least one inlet channel and at least one outlet channel, the inlet channel is communicated with the cooking cavity, and the outlet channel is communicated with the rice soup collecting box and used for conveying rice soup generated during normal work of the cooking utensil from the interior of the cooking cavity to the rice soup collecting box; the side, facing the rice soup channel, of the edge of the inlet channel extends to form a stop protruding block, the rice soup is prevented from returning to the cooking cavity again under the action of counter-acting force, and the stop protruding block at least surrounds the end, away from the outlet channel, of the inlet channel. The rice soup entering the rice soup channel from the cooking cavity is prevented from flowing back into the cooking cavity from the inlet channel when reaching the side, away from the outlet channel, of the stopping protruding block.

The utility model discloses a novel venom suction device, which relates to the technical field of medical instruments and comprises a tank body, a suction pipe and a vacuum suction gun. The vacuum exhaust gun is communicated with the tank body, and a tank opening is formed in the bottom of the tank body; the suction pipe is inserted into the position, close to a tank opening, of the tank body, a one-way piston is arranged at the joint of the suction pipe and the tank body, the tank body is connected with an inlet of the one-way piston, an outlet of the one-way piston is connected with the suction pipe, and the end, away from the tank body, of the suction pipe is connected with a needle tube. The utility model provides a novel venom suction device which is used for solving the technical problems that an existing venom suction device can only discharge venom to the surface of skin, the venom can return to the skin if the device is dismounted, and the venom cannot be timely and effectively discharged.

This utility model discloses a sealing fluid system for a pressure vessel agitator, configured to provide sealing fluid to the sealing components of the pressure vessel agitator. The sealing components have a receiving cavity for containing the sealing fluid, including a storage tank, a delivery assembly, and a return assembly. The delivery assembly includes a delivery pump, with its inlet end connected to the storage tank and its outlet end connected to the receiving cavity. The return assembly includes a return pipe and a hydraulically controlled check valve. One end of the return pipe is connected to the receiving cavity, and the other end is connected to the storage tank. The hydraulically controlled check valve is positioned in the flow path of the return pipe, and its control port is connected to the outlet end of the delivery pump. When the outlet pressure of the delivery pump is less than a set value, the hydraulically controlled check valve closes the return pipe. This utility model can prevent the sealing fluid from returning to the storage tank via the return pipe when the delivery pump stops.

A lifting device (10) configured to be integrated into a jaw crusher (20) to facilitate access to an article (100, 80) to be lifted from above during machine maintenance, the crusher (20) comprising a crusher frame (30) typically composed of oppositely disposed side walls (31, 32) and supporting a fixed jaw (40) and a movable jaw (50), the invention relates to a lifting device (10) for a jaw crusher (20) comprising a fixed jaw (40) and a movable jaw (50) defining a crushing chamber (60) for material to be crushed, the lifting device (10) comprising at least one primary pulley (90, 93, 94) mountable to said jaw crusher (20) above an article (100) to be lifted and configured for lifting a toggle plate (80) of the jaw crusher, wherein the lifting device can be configured to lift the article (100, 80) in a linear lifting manner.