170results about How to "Adjustable area" patented technology

When a user sets water power using a water power adjustment switch in a remote control device, a controller controls the period of pressure fluctuations, the width of pressure fluctuations, and the central pressure of the discharge pressure of a pump on the basis of a signal transmitted by radio from the remote control device. When the user sets the divergent angle of washing water using a washing area adjustment switch in the remote control device, the controller controls the divergent angle of the washing water sprayed from a posterior nozzle on the basis of the signal transmitted by radio from the remote control device. Consequently, the washing water supplied to a side surface of a cylindrical swirl chamber from a first flow path in the posterior nozzle is sprayed from a spray hole as dispersed spiral flow, and the washing water supplied to a lower part of the cylindrical swirl chamber from a second flow path in the posterior nozzle is sprayed from the spray hole as linear flow.

A dustproof and waterproof multipurpose LED-light power source assembly comprises a heat sink, a heat-dispersal fan, a circuit board driver module, an LED light source module, a power-source casing top cover and a power-source casing bottom cover. The LED light source module comprises plural LED chips and an LED heat-dispersing substrate. The heat-dispersal fan is a dustproof and waterproof fan. The heat sink comprises a baseboard to which the LED heat-dispersing substrate is fixedly connected and conducts dispersed heat. At the center of the top of a heat-dispersal member, a space is provided to accommodate the heat-dispersal fan. The power-source casing bottom cover is positioned above the heat-dispersal fan and is fixedly connected to the heat sink. The power-source casing top cover and the power-source casing bottom cover are hermetically connected one to the other. A waterproof bolt assembly is connected to the top of the power-source casing top cover.

A rapid preparation method of crystal mixed and conveniently doped micropore-meso pore structure titania and the former body of the micropore-meso pore structure titania with the advantages of easy material acquisition, simple and simple and easy preparation condition and technics control and the pore structure can be adjusted in the range of the micropore and the meso pore. The present invention is characterized in that the alkali metal titanate is selected as material to react in a wet atmosphere with a temperature of 20 to 250 degrees and a humidity of 2 to 100 percent for 0.5 to 72 hours, then washed by water or acid solution and finally roasted by air or heatedly treated by solvent. Compared with the prior work, the present invention has the advantages of short reaction time, low preparation cost, easy structure control and easy scale manufacture, etc. The most probable pore size of the micropore-meso pore structure titania and the the former body of the micropore-meso pore structure titania is 1 to 20nm, the pore volume is 0.05 to 0.40.4cm3 / g and the specific surface area is is more than 30m2 / g.

A biodynamic apparatus to perform correct, safe and effective SIT-UP and LEGS-UP exercises and simultaneously perform spinal arching, spinal decompression, and flexibility exercises, comprising of two part frame hinged at one end and a set of parallel bars that elevate and anchor the legs of the user concentrating the exercise in the abdominal area of the body. The main feature of the apparatus is provided by a device the inventor calls “flexor”. The flexor is not an ordinary lumbar support. Its function is to meet the natural fulcrum of the human torso, which is below the sacrum, to safely and efficiently articulate. Most exerciser bend the spine during the exercise, rather than the pelvis putting a tremendous negative stress on the vertebra and on the intervertebral discs. With the help of the “Flexor” the torso can move from horizontal to at least 90 degrees angle as one straight piece, free from the gravitational stress produced on the spine, especially on the cervical vertebra, by the weight of the head during the initiation of the exercises. It is a fact that ordinary SIT-UP and LEGS-UP exercises the work is performed for the most part by the neck, back and lumbar muscles during the first part of the movement placing a dangerous negative stress on the spine, and especially on the spinal cord. With the use of this apparatus, the reverse can be observed. The user by lying on the “flexor” places in traction the entire set of abdominal, pectoral and neck muscles creating a direct line of force between the abdomen and the head. The spine is arched and decompressed, the abdominal muscles are in traction and the lumbar muscles are neutralized since there are bent beyond their working point. This position of the body allows to safely concentrate 100% the force on the abdominal muscles to initiate the primary work constituted by the lifting of head of the user, instead of the neck, and on the lumbar muscles of the user, as well as to protect the spine and the weak abdominal muscles from negative stress and subsequent short and long term injuries. Decompression, arching, and flexibility of the spine, being achieved during this new method of performing SIT-UP and LEGS-UP exercises, simultaneously, make this apparatus bio-dynamically correct, as far as distribution, compensation and equalization of stresses; meet the scientific principles of muscle dynamics of traction and contraction; protect the spine from negative stress, especially the weak cervical and lumbar areas; maintain and enhance the spine's integrity and flexibility; and obtain maximum abdominal muscle developments, which are the major benefits of this invention. The flexor is mounted on two external parallel railing as to adjust to the length of all users. It also has an internal adjustable mechanism that allows its two padded flanges to adjust in width to accommodate all waist sizes of users for additional support and prevention of lateral stress to the lower spine.

The invention relates to a graphene hollow nano fiber and a preparation method thereof. The external diameter of the graphene hollow nano fiber is 7-700nm, the internal diameter is 6-698nm, the length-diameter ratio is 20:1-2000:1, and the specific area is 300-2600 m<2> / g. The preparation method comprises the following steps: by using an inorganic fiber as a template, heating to 400-1000 DEG C in a carrier gas, introducing a carbon source, and decomposing at the same temperature to directly form the graphene hollow fiber or form a carbon-inorganic template composition fiber; and cooling the composition fiber, treating with acid or alkali, filtering, washing and drying. The preparation method is simple; and the product has the advantages of high purity, complete structure and high mechanical strength, and is suitable to be used as a separation or adsorbing material, an electrode material for electrochemical energy storage or a conducting agent.

The invention relates to a method for preparing a titanium diboride and titanium carbide enhanced iron-based wear resistant composite paint. The method comprises the following steps: selecting a plurality of materials from iron powder, titanium powder, ferrotitanium powder, boron carbide powder, ferroboron powder and graphite powder to mix and form mixed powder containing the four elements of iron, titanium, boron and carbon, adding or not adding one or more of Ni, Cr, Si and Y2O3, placing the obtained powder in a ball mill or mixer to mix evenly; then using the mixed metal powder to form paste, coating the paste on the surface of carbon steel to form a layer of preset powder; and then adopting laser heating to irradiate the preset powder and ensure that the preset powder and partial carbon steel base material are molten to form a molten bath and perform metallurgical reaction. The preparation method is simple and the prepared composite paint has high hardness and excellent wear resistance.

The refillable grout dispenser with guide has a reversible dispensing tip that fits into either end of the tube. The dispenser is operated by standard caulking guns. A plunger disc is pushed through the tube by the caulking gun plunger, forcing the grout out the dispensing tip. The dispensing tip may be removed from one end of the tube, and may be re-installed on the other end of the tube so that the tube may be refilled with grout and used again. The tip has a guide pin extending from near its opening. The guide pin helps keep the dispensing tip raised above the surface the grout is being applied to, and also helps the user move the dispenser along the desired path. The outer surfaces of the dispensing tip may be flat to help the user grip the tip when removing or installing it.

A honed embossed adhesive tape basilemma is made of pure polyolefin resin, the roughness of the front face Ra value is 20-60 mu inch, the roughness of the back face Ra value is 60-200 mu inch, the production method thereof comprises steps of melting and extruding, embossing and finishing. The honed embossed adhesive tape basilemma prepared by the invention has special honed effect, even surface roughness, even thickness stability, good longitudinal and transverse tear resistance, good anti-blocking effect and excellent gluing effect. The method of the invention does not change the inner structure of the basilemma material, thus not influencing the physical performance of the basilemma material, and being applicable to production of honed embossed adhesive tape basilemma and production of honed basilemma for other special uses.

The invention provides a bait casting machine for cage culture, wherein the machine is equipped with a diesel engine or petrol engine water pump, which is connected with a triple valve, one path of the triple valve is connected with the bait bin through a flushing control valve and flushing pipes, the bait bin is in communication with the mixing chamber through the blanking tube, the blanking tube is equipped with a blanking control valve on the outside, the other path is connected with a bait throwing flexible pipe through the mixing chamber, the one end of which is equipped with a blow head, one end of the angle controller is connected with the outer wall of the bait bin, the other end is connected with the bait throwing flexible pipe. The invention solves the problem of absent power supply of the deep water net cages.

A membrane electrode assembly for an electrochemical cell assembly is provided with a modified catalyst layout. The modified catalyst layout improves reactant fluid flow along the membrane electrode assembly, reduces wear on the membrane electrode assembly and improves electrochemical cell efficiency during operation.

The invention discloses a medical small-area burn instrument for adjusting temperature and pressure, which comprises an animal fixing device, a burn device, a pedestal, a clamper and an elastometer. The burn device is fixed on the clamper, the pedestal is fixedly provided with a pull rod, the clamp is arranged on the pull rod in an axial sliding mode, one end of the elastometer is fixed oppositely to the pedestal and the other end of the elastometer is axially and fixedly connected with the back end of the clamper, the burn device is an electric heating burn device and comprises a burn head and an electric heater, and the electric heater is connected with an electric source through a temperature control device. The medical small-area burn instrument has the advantages that the medical small-area burn instrument has objective pressure display by adopting a pressure indicating device and a temperature adjusting device, can adjust pressure, temperature and burn area, and can adjust burn temperature, burn pressure and area according to the test requirements to make a standardized burn wound surface.

The invention belongs to the field of photocatalytic materials, and particularly relates to a monatomic noble metal anchoring defect type WO3 / TiO2 nanotube as well as preparation and application thereof. WO3 particle loaded TiO2 nanotubes are modified by adopting electrochemical reduction, and are subjected to electrochemical treatment to further load monatomic noble metals, so that the electron transport capacity and hole electron pair composite performance of the WO3 particle loaded TiO2 nanotubes are improved, and the photocatalytic performance of the WO3 particle loaded TiO2 nanotubes is improved. Oxygen vacancies on the surfaces of WO3 particles stabilize the monatomic noble metals, the noble metals are prevented from being agglomerated and inactivated, and the material is applied tophotocatalytic degradation of indoor volatile organic compounds and has higher degradation efficiency and stability.

An amino-enhanced graphene membrane and a preparing method thereof are disclosed. The method includes (1) adding a mixture of a graphene oxide solution, a water-soluble amine type crosslinking agent and a water-soluble reductant into a flat-shape hollow reactor, with the water-soluble amine type crosslinking agent being one or more selected from a group consisting of ethylenediamine, diaminopropane, diaminobutane, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, ammonia, poly(allylamine) and para-phenylene diamine, and the water-soluble reductant being one or more selected from a group consisting of ascorbic acid, sodium ascorbate, sodium citrate, hydroiodic acid, hydrobromic acid, sodium hydrogen sulfite and sodium sulfide, (2) heating the reactor at 60-95 DEG C, and (3) drying amino-enhanced graphene hydrogel prepared in the step (2). A nitrogen-doped graphene membrane and a preparing method thereof are also disclosed. The nitrogen-doped graphene membrane is prepared by subjecting the amino-enhanced graphene membrane to heat processing. The methods are simple and mild in conditions, and the prepared graphene membranes are uniform in structure and excellent in mechanical properties.

The invention discloses an electrochemical self-doped WO3 particle-supported TiO2 nanotube, and a preparation method and an application thereof, and belongs to the field of photocatalysis materials. WO3 nanoparticles are loaded on the inner wall and the outer wall of a TiO2 nanotube; and the above compound contains W<5+> defects and Ti<3+> defects and oxygen vacancies associated with the W<5+> defects and Ti<3+> defects. The TiO2 nanotube is modified with the supported WO3, and is further modified by electrochemical reduction treatment to change the defect capacity and the response range to visible lights, so the photocatalytic and photoelectrocatalytic performances of the TiO2 nanotube are improved. The material has a high degradation efficiency when applied to the photocatalytic degradation of indoor volatile organic compounds and the photoelectric degradation of antibiotic solutions.

The invention relates to a swing type hydraulic proportioning and servo valve, wherein a valve core (6) is sheathed in a valve hole (R) at the center of the valve body (5). The two ends of the valve core (6) are enclosed by a valve cover (4) and a valve seat (7), so that a three-position four-way valve is assembled. The valve is matched with a swing motor (3) and an angular displacement sensor (1) and is controlled by a control chip. The valve body (5) is provided with an oil supply hole (P) and an oil return hole (T) at the front surface thereof, and an oil lifting hole (A) and an oil dropping hole (B) at the rear surface thereof. The oil supply hole (P), the oil return hole, the oil lifting hole (A) and the oil dropping hole (B) are respectively communicated with an oil tank through oil pipelines (L). The inner part of the valve body is communicated with the valve hole (R) through an oil-passing pipe cavity (N). One end of the valve core (6) passes out of the center hole of the valve cover (4) and is connected with the swing motor (3). The other end of the bidirectional output shaft of the swing motor (3) is connected with an angular displacement sensor (1). The control chip regulates the input current of the motor and the rotation angles of the output shafts in time according to the feedback information of the sensor, adjusts the swing angle of the valve core (6) and changes the sectional areas of openings of the oil holes so that the hydraulic flow and the pressure keep the design values. The swing motor can realize stepless speed regulation and stop in any positions within the swing range, and the swing type hydraulic proportioning and servo valve has the advantages of high control precision, good dynamical property, convenient and flexible operation and wide application range.

The invention relates to an X-ray detector based on a perovskite single crystal particle composite film and a preparation method thereof. The X-ray detector comprises a hole transport layer, a perovskite single crystal particle composite film, an electron transport layer, an interface modification layer and an electrode. The perovskite single crystal particle composite film is a composite film ofperovskite single crystals and polyols or polymers, the film thickness is 30-200 [mu]m, and the perovskite single crystals are methylamine lead bromide perovskite single crystals. The preparation method comprises the following steps: preparing methylamine lead bromide perovskite single crystals, crushing, screening, uniformly dispersing in a polyol or polymer solution, spin-coating on a hole transport layer or an electron transport layer, and annealing to obtain a perovskite single crystal particle composite film; and depositing an electron transport layer or a hole transport layer, an interface modification layer and an electrode on the surface of the obtained composite film to obtain the X-ray detector based on the perovskite single crystal particle composite film. The detector is simpleto prepare, capable of detecting a relatively low dosage rate, high in sensitivity, quick in response and excellent in charge transmission performance.

The present invention is to provide an electrical urea biosensor and its manufacturing method. In the present invention, a sensitive film is positioned on a surface of a substrate, wherein a conductive layer is formed on the surface of the substrate. The sensitive film is used as an ion-sensitive electrode. The sensitive film provides with a sensitive region and a non-sensitive region. A conductive line is extended from the conductive layer for using as an external electrical contact point. The present invention utilizes a package encapsulant covering the non-sensitive region of the sensitive film to define a sensitive window at the sensitive region and a urea enzyme is immobilized within the sensitive window of the sensitive film. Then, the present invention completes the formulation of a urea biosensor. The present invention is a disposable urea biosensor and provides with advantages of the mass production, low cost, and the easy package.

A fusing roller and a fusing apparatus having the same are provided. The fusing roller includes: an induced coil, which generates an alternating magnetic flux that varies depending on an input alternating current; a heating roller, which is heated by an eddy current that is generated by the alternating magnetic flux; and a compensator, which compensates for the eddy current generated where it is located

A mobile communication method, in which radio base stations transmit common control signals to all of their covering areas, includes a first radio base station determining a reception power level of a common control signal transmitted by a surrounding radio base station; the first radio base station adjusting, based on the determined reception power level of the common control signal, the transmission power level of the common control signal; and (C) the first radio base station and surrounding radio base station, when having detected that no mobile stations are existent under charge of those radio base stations, reducing the transmission power levels of the common control signals.

A dustproof and waterproof multipurpose LED-light power source assembly comprises a heat sink, a heat-dispersal fan, a circuit board driver module, an LED light source module, a power-source casing top cover and a power-source casing bottom cover. The LED light source module comprises plural LED chips and an LED heat-dispersing substrate. The heat-dispersal fan is a dustproof and waterproof fan. The heat sink comprises a baseboard to which the LED heat-dispersing substrate is fixedly connected and conducts dispersed heat. At the center of the top of a heat-dispersal member, a space is provided to accommodate the heat-dispersal fan. The power-source casing bottom cover is positioned above the heat-dispersal fan and is fixedly connected to the heat sink. The power-source casing top cover and the power-source casing bottom cover are hermetically connected one to the other. A waterproof bolt assembly is connected to the top of the power-source casing top cover.

The invention discloses a firefighting exhaust fan and relates to the technical field of ventilation equipment. The firefighting exhaust fan comprises a shell, a driving device, a fan blade rotary control mechanism, a plurality of internal fan blade component openings, an angle adjusting piece, a plurality of external fan blade components and a telescopic adjusting mechanism. The firefighting exhaust fan has the beneficial technical effect of directly changing the air draft quantity without being detached; the driving device is fixedly connected with the external end of the shell; one end of the fan blade rotary control mechanism is connected onto the driving device in a matching manner; the other end of the fan blade rotary control mechanism is positioned in the shell; the internal fan blade component openings are uniformly formed in the fan blade rotary control mechanism in a surrounding manner; the angle adjusting piece is connected onto the fan blade rotary control mechanism in a matching manner and is connected with the internal fan blade component openings in a matching manner; the external fan blade components are movably connected with the internal fan blade component openings; the external ends of the external fan blade components are movably connected into the telescopic adjusting mechanism; and the telescopic adjusting mechanism is connected onto the shell in a matching manner.

The invention discloses an adjustable preset powder laying device used for laser cladding. The adjustable preset powder laying device comprises a workbench, a base plate arranged above the workbench and a base plate clamping mechanism installed on the workbench and used for fixing the base plate. A frame assembly with an adjustable length and width is arranged on the base plate, a frame clamping mechanism used for fixing the frame assembly is installed on the base plate clamping mechanism, and a movable beam mechanism with an adjustable height is arranged on the frame assembly. The movable beam mechanism comprises two guiding blocks and a middle block arranged between the two guiding blocks. A dual-directional lead screw used for driving the guiding blocks to move back and forth is arranged on the middle block in a penetrating mode in the horizontal direction, and a retractable curtain capable of stretching out and drawing back is arranged below the dual-directional lead screw. The adjustable preset powder laying device used for laser cladding is simple in structure and novel and reasonable in design, during preset powder feeding laser cladding, the power laying thickness and area can be accurately controlled during laser cladding preset powder laying, the adjustable effect of the powder laying area and thickness can be achieved, and operation is convenient.

The invention provides a high-bypass-ratio turbofan engine and a variable bypass duct air exhausting area type air exhausting device thereof. The variable bypass duct air exhausting area type air exhausting device of the high-bypass-ratio turbofan engine is applicable to a civilian high-bypass-ratio turbofan engine nacelle adopting a variable bypass duct grid type reaction thrust actuating device.The air exhausting device comprises a flow resisting door, an outer moving cover and a reaction thrust mechanism, wherein a certain amount of clearances are formed between the flow resisting door andthe outer moving cover, and the flow resisting door is kept in a non-working state through the reaction thrust actuating mechanism; a certain amount of lap is generated between the outer moving coverand the outer wall of a fixed nacelle of the turbofan engine nacelle, so that a reaction thrust grid is prevented from air leakage; the reaction thrust actuating mechanism pushes the outer moving cover in the early working period, and thus the air exhausting area of a bypass duct of the turbofan engine can be changed; when the reaction thrust actuating mechanism continuously moves the outer moving cover, no amount of lap is generated between the outer moving cover and the outer wall surface of the fixed nacelle, and the flow resisting door is switched to a working state to generate reaction thrust force through the reaction thrust actuating mechanism.

The invention provides an electric automobile DC charging pile heat dissipation apparatus and method. The apparatus comprises a grid matrix air inlet and an air outlet which are arranged on a pile body, and a temperature monitoring unit, a master unit, an air inlet adjustment unit and an air outlet adjustment unit which are arranged in the pile body and are connected with one another, wherein the temperature monitoring unit is used for monitoring a temperature inside the pile body and sending a temperature over-limit alarm signals to the master control unit; the master control unit is used for emitting air inlet and outlet adjustment commands according to the received temperature over-limit alarm signals; and the air inlet adjustment unit and the air outlet adjustment unit are used for adjusting the areas of the air inlet and the air outlet so as to release the temperature over-limit alarm signals. The area of the air inlet and the area of the air outlet can be adjusted, the problem of incapability of heat dissipation due to quite high temperature inside the pile body under the condition of a high environment temperature and in the operation process of the charging pile can be solved, and the conflict of difficult cabinet body protection due to too large air inlet and air outlet is also well solved.

Disclosed is an electrochemical biosensor having a sample introduction channel in which an insulator is employed to introduce a small amount of a sample uniformly and accurately and to adjust an area of a working electrode, thereby guaranteeing the accurate quantitative analysis of a sample. Provided with a sample collection barrier at a sample entrance, the biosensor allows a sample to be introduced at higher accuracy and to be analyzed with higher reproducibility and reliability.

Disclosed is a mobile power supply. The mobile power supply comprises a shell, a battery assembly, a clamping assembly and an illumination apparatus, wherein a sliding groove, a USB interface, a charging plug and a mounting groove are arranged in the shell; the battery assembly is arranged in the shell; the clamping assembly comprises a limiting plate, an adjusting block and an elastic part; the illumination apparatus comprises a lamp holder and an LED lamp wick; the lamp holder is inserted in the mounting groove and connected with the battery assembly through a switch; the LED lamp wick is arranged on the lamp holder; and the LED lamp wick is electrically connected with the lamp holder. According to the mobile power supply, a mobile terminal is paced in a placement region and inserted and connected with the charging plug; the adjusting block is glidingly connected with the sliding groove through the sliding block, so that the placement region area is adjustable; therefore, the size of the mobile terminal is not limited, so that the mobile power supply can charge multiple kinds of electronic equipment, and the practicability of the mobile power supply is greatly improved; in addition, by virtue of the lamp holder and the LED lamp wick, the mobile power supply has the illumination function; and illumination requirement of a user temporarily can be satisfied without needing an external illumination tool, so that the mobile power supply is practical in function.

The invention relates to the technical field of transformer machining, and discloses a drying device for machining an electronic transformer. The drying device comprises two transmission wheels, and atransmission mesh belt is in transmission connection between the two transmission wheels; the front side and the back side of the outer side of the transmission mesh belt are each connected with a sidebar, and the interior of each transmission wheel is fixedly connected with a rotating shaft; the rotating shafts are rotatably connected between the interiors of two footplates, and one end of the back side of the rotating shaft on the right side is fixedly connected with an output shaft of a transmission motor; and the footplates on the right and left sides are fixedly connected with a baseplate. According to the drying device for machining the electronic transformer, the situation that the electronic transformer is dried thermally and consequently damaged is avoided, and the machining quality of the electronic transformer is ensured; meanwhile, the drying efficiency is improved effectively, and the drying area can be regulated; the drying treatment can be performed for electronic transformers in different sizes and heights; and the applicability and practicability of the drying device for machining the electronic transformer are improved greatly.

An optical unit has a first lens holder holding a first lens and a second lens holder holding a second lens, the first lens holder and the second lens holder being mounted on a common lens base. The first lens holder is movable in the direction of one side of the exit end face of a light tunnel, and the second lens holder is movable in the direction of another side, adjacent to the one side, of the exit end face of a light tunnel. The first lens holder and the second lens holder are independently moved to bring an illuminating light area on a DMD, as an image forming device, into alignment with an image forming area on the DMD. The illuminating light area can thus be accurately positioned in the image forming area on the DMD. The optical unit has a high light utilization efficiency and can easily be operated for positional adjustment of the illuminating light area. The optical unit is incorporated in a projection display apparatus.

The invention discloses an adjustable air-suction paper-feeding mechanism. The adjustable air-suction paper-feeding mechanism comprises a front belt roller, a rear belt roller, a driving roller, a photoelectric switch, a printing rubber roller, an air-suction belt, an air chamber plate, air bellows, a hinge pin, top frames, swing arms, a swing arm shaft, cylinders and air hole switch assemblies. The two ends of the front belt roller, the two ends of the rear belt roller and the two sides of the driving roller are arranged on wall boards of the two sides respectively, the photoelectric switch is arranged in front of the printing rubber roller, the front belt roller, the rear belt roller and the driving rollers are wrapped with the air-suction belt, the air bellows of a front row and a rear row are installed below the air chamber plate, one end of the air chamber plate is positioned on the wall boards of the two sides, and the other end of the air chamber plate is arranged on the top frames; the top frames and the swing arms are fixed on the same swing arm shaft, the swing arm shaft is arranged on the wall boards of the two sides, the other end of the each swing arm is hinged to the corresponding cylinder, the cylinders are fixed on the wall boards of the two sides through fixing shafts, and the air hole switch assemblies are installed on the air chamber plate. According to adjustable air-suction paper-feeding mechanism, air suction is even, the air suction area and the air volume are adjustable, and rapid and stable conveying can be achieved whether paper is big or small.

A cast iron or aluminum sectional boiler has essentially annular sections, one front section, one rear section and at least one center section being provided which form a furnace chamber having essentially surrounding heating gas passages, and their annular water compartments are connected to one another via hubs. The sections have one return connection piece and one feed connection piece, one flue spigot as well as at least two anchor rods for holding the section block together. Annular gaps are provided as heating gas passages between each two adjacent sections, and that the heating gas passages are subdivided into a primary section and a secondary section.