2466 results about "Moulding device" patented technology

The invention relates to the technical field of magnesia-alumina-carbon brick processing, in particular to a processing and forming device of an anti-stripping unfired magnesia-alumina-carbon brick for a steel ladle wall, which comprises a pressing machine table, a hydraulic rod piece is fixedly mounted on the pressing machine table, and a movable bearing table is fixedly mounted on the hydraulic rod piece; the mold bearing platform is mounted on the pressing machine platform and is used for supporting the pressing mold; the oil feeding assembly is fixedly mounted on the mold bearing platform; the movable oil injection assembly is mounted on the oil feeding assembly, and is driven by a movable bearing platform to move so as to carry out oil injection treatment on the mold; when oil injection of a mold needs to be carried out, the movable bearing platform drives the stepped rack to move upwards, the oil injection pipe is driven to move under the action of the stepped rack, a spray head reaches the mold, oil injection treatment is conveniently carried out on the mold, manual operation is not needed, great convenience is achieved, the oil injection pipe moves to one side during pressing, and pressing cannot be hindered.

The invention discloses a rolling forming device and a processing control method for a vehicle battery steel-clad frame, the rolling forming device comprises a rolling base, a plurality of rolling forming units are arranged on the rolling base side by side along the X-axis direction by taking the conveying direction of a steel plate sheet as the X-axis direction and the width direction of the steel plate sheet as the Y-axis direction; an auxiliary platform is arranged at the end, opposite to the X-axis direction, of the rolling base, a surface detection device and a synchronous positioning unit are installed on the auxiliary platform, a finished product detection unit is installed at the other end of the rolling base, and the rolling forming unit comprises a frame, an upper rolling mold and a lower rolling mold, the upper rolling die is driven by a servo electric cylinder at the upper end of the frame to ascend and descend so as to adjust the distance between the upper rolling die and the lower rolling die. The problems that existing rolling equipment cannot adapt to the characteristics of martensite steel plates, so that the machining precision is low, and the rolling equipment cannot be suitable for high-precision forming of battery steel-clad frames can be solved.

This invention provides a high-frequency coil heating forming device for titanium alloy ring-ribbed parts, comprising a high-frequency induction heating unit, an inner-support rotary chuck unit, an automatic horizontal rotary unit, a forming wheel unit, and a hydraulic power unit. The inner-support rotary chuck unit is mounted on the automatic horizontal rotary unit and uses a slider to round the ring ribs. The hydraulic power unit provides power for the slider movement and is located below the automatic horizontal rotary unit. The high-frequency induction heating unit and the forming wheel unit are respectively mounted on the sides of the automatic horizontal rotary unit. The high-frequency induction heating unit heats the ring rib material on the inner-support rotary chuck unit through a high-frequency heating coil, and the forming wheel unit is used to process the end flange structure of the ring ribs. This invention achieves efficient heating of titanium alloy ring-ribbed parts to their forming temperature and maintains it constant. The horizontal rotary table performs horizontal rotational motion, coupled with the forming wheel, to complete the hot forming of the vertical edges of the ring ribs.

The invention discloses a mortar material conveying and forming device which comprises a machining table, a conveying device is arranged on the machining table, a mold is arranged on the conveying device, a mold cavity is formed in the mold, a sprue gate matched with the mold cavity is formed in the top end of the mold, a storage tank is arranged on the machining table, and a discharging pipe matched with the sprue gate is arranged below the storage tank. Moving plates are arranged on the two sides of the machining table through adjusting assemblies, beating mechanisms are arranged on the moving plates, vacuumizing assemblies are further arranged on the moving plates, and vacuumizing pipes matched with the vacuumizing assemblies are arranged at the top ends of the molds. The mold adopts an openable structure and is integrated with the heating device, the mold cavity is preheated through the heating device in the cavity, the viscosity of a mortar material is effectively reduced, the fluidity of the mortar material is improved, and therefore the problem that in the prior art, the filling efficiency is low due to high mortar viscosity is solved; and the forming requirements of thin-wall, special-shaped and other complex cavity components are met, and meanwhile material hardening waste is avoided.

The invention provides a multi-directional die forging forming device for a heavy-duty car lifting lug, and relates to the technical field of car accessories, the multi-directional die forging forming device comprises a working rack, an upper die assembly and a lower die table, and a multi-directional punch mechanism and a cooling gas injection assembly are arranged on the outer side of the lower die table in the circumferential direction; the multi-direction punch mechanism comprises a rotating unit and a plurality of horizontal punch assemblies. The rotating unit is arranged on the outer wall of the lower die table and connected with the horizontal punch assemblies. In the descending process of the upper die assembly, all the horizontal punch assemblies are driven to synchronously feed in the radial direction, lifting lug blanks in a cavity are extruded from the side direction, and cooperative multi-directional die forging with an upper die is achieved. The cooling gas injection assembly communicates with the horizontal punch assembly, cooling gas flow is injected into the horizontal punch assembly after forming, heat exchange is conducted through the end of a punch and a forge piece, and online rapid cooling and shaping are achieved. Multi-punch synchronous radial feeding and forge piece in-situ cooling are achieved, and the forge piece forming precision, the structure uniformity and the production efficiency are effectively improved.

The utility model discloses a rubber vulcanization forming device, and belongs to the technical field of rubber product vulcanization, the rubber vulcanization forming device comprises a rubber vulcanization forming machine and a hydraulic cylinder mounted on the rubber vulcanization forming machine, one side of the rubber vulcanization forming machine is provided with a control host, and the hydraulic cylinder is provided with a hydraulic cylinder. A guide rail frame and a mold plate slidably mounted on the guide rail frame are arranged on the rubber vulcanization forming machine, a demolding mechanism is arranged on the rubber vulcanization forming machine, and the demolding mechanism comprises a supporting table connected with the rubber vulcanization forming machine and refrigeration assemblies symmetrically mounted on the supporting table; after the refrigeration assembly generates cold air, the cold air is blown to the position below the demolding plate through the air distribution pipe and the air guide cavity, materials and the mold plate are cooled, cooling is carried out during demolding, a rubber product can be rapidly shrunk, the demolding difficulty is lowered, the possibility of product damage is reduced, meanwhile, the temperature of the mold plate can be lowered, and the service life of the mold is prolonged.

The invention discloses a forming device of a cable connector. The forming device comprises a workbench; the jig conveying mechanism comprises a jig conveying assembly, a jig backflow assembly, a first jig transferring assembly and a second jig transferring assembly. The jig conveying assembly and the jig backflow assembly are both arranged at the top of the workbench and provided with injection molding body jigs. The first jig transferring assembly and the second jig transferring assembly are both arranged at the top of the workbench and located between the jig conveying assembly and the jig backflow assembly so as to transfer all injection molding body jigs to the jig conveying assembly or the jig backflow assembly; a wire needle assembling mechanism, a first injection molding mechanism, a first waste clamping mechanism, a second injection molding mechanism and a second waste clamping mechanism are sequentially arranged in the injection molding body jig conveying direction of the jig conveying assembly. According to the scheme, a plurality of injection molding body jigs are automatically and circularly conveyed, the production period is shortened, the production continuity is enhanced, and the requirement of large-scale production can be met.

The invention discloses a powder metallurgy gear pressing forming device, and belongs to the technical field of metal powder forming, the powder metallurgy gear pressing forming device comprises a supporting mechanism, and a working platform used for forming machining is fixedly installed in the middle of the supporting mechanism; a first supporting frame is further arranged below the working platform, and a pressing forming mold is installed between the working platform and the first supporting frame. A second supporting frame is fixedly connected to one side of the working platform, an automatic filling mechanism is installed between the working platform and the second supporting frame, and a vibration tamping mechanism is further installed on the automatic filling mechanism; and an extrusion forming mechanism is mounted at the top of the supporting mechanism. By designing the automatic filling mechanism and the vibration filling mechanism, filling, vibration filling and material supplementing work of the forming mold can be rapidly completed, so that the situation that a local cavity appears in metal powder is effectively avoided, and the overall machining quality of a formed gear is guaranteed.

The invention discloses a forming device and method for a hydrogen storage bottle with a hydrogen-resistant inner container, and relates to the technical field of hydrogen storage bottle forming, in particular to a rolling mechanism arranged on the bottom surface of a cross beam of an arch frame and used for rolling a bottle body and a bottle neck of an aluminum alloy bottle body, and a supporting mechanism used for supporting the bottle body is arranged on the table top of a machine table. A support located on the right side of the supporting mechanism is fixedly arranged at the right end of the machine table, and a vertically-upward laser welding head is fixedly arranged in the support. The left side wall of the arch-shaped frame is provided with a tool and a driving mechanism, wherein the tool and the driving mechanism are used for positioning the aluminum alloy bottle body, assembling the aluminum alloy bottle body and the hydrogen-resistant inner container together and driving the aluminum alloy bottle body and the hydrogen-resistant inner container to rotate synchronously. The top wall and the bottom wall of the rotating base are each provided with a holding assembly, and an inner supporting assembly is arranged between the top wall and the bottom wall of the rotating base. The hydrogen storage bottle forming device has the beneficial effects that the hydrogen storage bottle forming efficiency is greatly improved, and the hydrogen storage bottle forming quality is greatly improved.

The invention discloses an adjustable bipyramid solid material forming device for square and rectangular tubes, which belongs to the technical field of solid material forming of square and rectangular tubes and comprises a working cabinet, a conveying solid material frame body and a forming frame body, and the conveying solid material frame body and the forming frame body are fixedly mounted on the surface of the working cabinet. A plurality of bipyramids are arranged on the rotating frame at equal intervals in the strip steel conveying direction; the front end of the bipyramid is provided with a small-dip-angle guiding face for guiding strip steel in, the rear section of the bipyramid is provided with a large-dip-angle reinforcing inclined face for fixing strip steel conveying, and a connecting arc face is arranged between the small-dip-angle guiding face and the large-dip-angle reinforcing inclined face. A steering structure for regulating and controlling the rotation of the rotating frame is arranged on the fixed material conveying frame body, the rotating frame rotates to adjust the inclination angle of the bipyramids for guiding the fixed materials, and an adjusting mechanism for adjusting the fixed material spacing of the bipyramids on the two sides of the strip steel is arranged on the rotating frame; according to the change of the size and thickness of the strip steel, the material fixing range of the bipyramid can be adjusted, and the adaptability of equipment machining is expanded.

The invention relates to the field of absorption core forming equipment, in particular to a medical and sanitary absorption core forming device which comprises a wheel body, evenly-distributed mold cavities are formed in the middle of the periphery of the wheel body, a fixing ring and a sliding ring are slidably connected to the rear side of the interior of the peripheral wall body of the wheel body, and the fixing ring is slidably connected to the periphery of the sliding ring. A rotating ring is fixedly connected to the rear end of the fixing ring, a tooth groove is formed in the rear portion of the inner side of the rotating ring, a driving gear is connected to one side in the tooth groove in a meshed mode, a plurality of servo motors are installed on the front portion of the inner side of the rotating ring, threaded rods are fixedly connected to the driving ends of the servo motors, and the front portions of the threaded rods are connected to the interior of the wall body of the sliding ring in a threaded mode. According to the absorption core production device, the absorption core production process is smoother, the unit time yield is remarkably improved, fiber distribution deviation can be avoided through the stable negative pressure environment, and the basic structure consistency of absorption cores of each batch under large-scale mass production is ensured.

The utility model relates to the technical field of tubular molds, in particular to an assembly type tubular mold device which comprises a base, an inner mold plate is arranged on the base, outer mold plates are arranged on the base and located on the outer side of the inner mold plate, the number of the outer mold plates is multiple sets, the outer mold plates are sequentially arranged in the circumferential direction, rib plates are fixedly arranged on the two sides of the outer mold plates, and multiple sets of locking grooves are formed in the rib plates at intervals. A pouring cavity is defined by the inner formwork and the outer formwork, a bottom ring is arranged at the bottom of the pouring cavity of the base, multiple sets of fixing rods are fixedly arranged on the outer side of the outer formwork at intervals in the circumferential direction, pulleys are arranged at the bottoms of the fixing rods, guide rails are arranged on the periphery of the base, and sliding grooves matched with the pulleys are formed in the side faces of the guide rails. According to the device, the pulleys are arranged at the bottom of the outer formwork, so that the outer formwork can horizontally slide along the guide rails on the periphery of the base, the outer formwork can be conveniently separated and combined, and the splicing speed is increased.

The utility model discloses a plastic product forming device, which is applied to the technical field of plastic product forming and comprises an extrusion mechanism with an extrusion die head, a filling mechanism with a filling needle, a clamp mechanism and a forming die with a head die and a main die. The filling needle is provided with a gas channel and is connected into the supporting channels, a circular seam is formed between the supporting channels and the outer wall of the filling needle, the supporting channels are communicated through transverse channels, the transverse channels are connected with a total gas inlet channel, and a gas inlet of the total gas inlet channel is connected with a sterile gas source. According to the plastic product forming device, the main mold vacuum suction technology and the filling needle blowing technology are combined, and the production requirement for full forming of special bottle types and large-volume bottle types is met.

The present invention provides a user management device that allows for more appropriate information provision to users compared to managing users according to their roles. [Solution] The management device is characterized by comprising a management means for managing users by a first management method for managing the level of users who use the molding device according to their roles, and a second management method for managing the level of users according to their skill level in the work.

The application discloses a powder bonding forming device and method for a complex geological model, which comprises a 3D printing control system, a material conveying tank, a powder falling and paving assembly, a forming box, an inkjet printing assembly, a rack, a forming box moving assembly, a longitudinal beam module and a powder cleaning assembly; the material conveying tank is fixed above the powder falling and paving assembly; the powder falling and paving assembly and the inkjet printing assembly are respectively fixed on longitudinal beam sliding rails of the longitudinal beam module through sliding blocks, and the two are separately moved without interfering with each other during printing and forming; the forming box is located directly below a rectangular space surrounded by the longitudinal beam module, and a forming platform is located in the forming box; the forming box moving assembly is arranged at the bottom of the forming box, and the forming box can be moved along a tow chain to realize moving in for printing and moving out for powder cleaning. The powder paving and bonding functions of the equipment are realized through different modules, the printing efficiency is improved, in addition, the forming platform is lifted from the side, the overall height of the equipment is greatly reduced, and stable vertical movement of the equipment is ensured.

The utility model provides a rice roll forming device, and relates to the field of rice roll processing. The rice roll forming device comprises a rack, a driving part and a pressing part, the rack is provided with a containing cavity and a guide column, the containing cavity is provided with an opening, and the guide column extends in the opening direction perpendicular to the opening; the driving piece is arranged on the rack and is rotationally connected with the rack around a first shaft, and the axis direction of the first shaft is parallel to the extending direction of the guide column; the pressing piece is in transmission connection with the driving piece and provided with a guide groove, the guide column slides in the guide groove, the pressing piece opens the opening under the forward driving action of the driving piece, and the pressing piece closes the opening under the reverse driving action of the driving piece. Through cooperative arrangement of the guide columns and the guide grooves, it is guaranteed that the strokes of the pressing pieces are the same in each rice roll forming work, operation is simple and rapid, the production efficiency is improved, and batch production is achieved.

The invention discloses a steel machining and hammering forming device for steel smelting, and relates to the technical field of steel smelting, the steel machining and hammering forming device comprises a hammering device, the lower side of the hammering device is arranged on the ground, and two pits with communicated side faces are formed in the position, located on the left side of the hammering device, of the ground; a sealing cover is arranged at the position, close to the upper side, of the inner side of the left pit, a material receiving barrel is arranged on the inner side of the left pit, a placement mechanism is arranged on the inner side of the right pit, a control mechanism is arranged on the left side of the placement mechanism, and the placement mechanism comprises a supporting seat; the outer side of the supporting seat is arranged on the inner side of the right pit, and a plurality of annularly-distributed damping seats are fixedly connected to the position, close to the side, of the upper side of the supporting seat. According to the steel machining hammering forming device for steel smelting, the rotating cover is driven by the power assembly to rotate for multiple circles, then automatic clearing operation on the upper side of the placement base is achieved, and danger caused by manual operation is avoided.

This invention provides a molding device for shoe manufacturing, comprising a machine body, on which are mounted an upper mold body, a first lower mold body, and a second lower mold body. The first and second lower mold bodies are respectively matched with the upper mold body. The upper mold body is driven to rise and fall by a hydraulic cylinder. Both the first and second lower mold bodies are equipped with lower mold cooling components. Internal cooling pipes are provided in the upper mold body, the first lower mold body, and the second lower mold body. A cooling connection component is provided on one side of the machine body corresponding to the lower mold cooling component. The first and second lower mold bodies are driven to move back and forth by a moving mechanism. Through the above structure, this invention, when molding shoe soles, achieves simultaneous melting and molding of the next shoe sole and cooling and shaping of the upward-moving shoe sole by means of the upper mold body's upper mold inlet and outlet pipes, and the cooperation of the first and second lower mold bodies, the lower mold cooling components, the cooling connection component, and the moving mechanism, thereby improving the production efficiency of shoe soles.

The application discloses a pipe end face sealing equipment, which comprises a sealing unit, and the sealing unit comprises a pipe end face cutting device, a pipe end face forming device and a visual detection device. The pipe end face cutting device is used for cutting the pipe end face. The pipe end face forming device is used for heating and forming the pipe end face after being cut by the pipe end face cutting device, so as to seal the pipe end face. The visual detection device is used for acquiring image information of the pipe end face after being cut by the pipe end face cutting device and / or acquiring image information of the pipe end face after being heated and formed by the pipe end face forming device. The pipe end face sealing equipment can be seamlessly connected with a preceding cutting machine, can automatically convey the pipe for processing, can improve the processing efficiency, and can acquire the pipe end face image information through the visual detection device, so that whether the forming is successful can be known, and remedial measures can be taken, and the shaping effect is improved.

The utility model relates to the technical field of high polymer material forming processing, and discloses a foam microcellular foaming forming device based on supercritical fluid, which comprises a mixing box, a discharge valve, a placing cylinder, an L-shaped frame and a driver, an adjusting mechanism is arranged on the mixing box, an auxiliary mechanism is arranged on the adjusting mechanism, the adjusting mechanism comprises a rotary column, and the rotary column is arranged on the placing cylinder. A sliding plate is fixedly connected to the rotating column, a concave-convex opening is formed in the outer wall of the top of the containing barrel, a telescopic spring is fixedly connected to the outer wall of the bottom of the containing barrel, a compression spring is fixedly connected to the inner wall of the bottom of the sliding plate, and a scraping plate is slidably connected to the inner wall of the bottom of the sliding plate; the outer wall of the side, close to the compression spring, of the scraper is fixedly connected with a stirring rod. According to the utility model, the sliding plate and other structures are arranged, so that the problem that the quality of a final product is influenced due to the fact that a molten raw material and a mixture are not fully and uniformly stirred when supercritical fluid is mixed in a special plasticizing device is solved.

This invention relates to the field of casting molding technology and discloses a casting molding device for producing high-chromium cast iron wear-resistant materials. The device includes a machine body, a feeding hopper at the top of the machine body, a cylinder on the outer wall of the machine body, a dropping chamber at the bottom of the machine body, a discharge port on the outer wall of the machine body, a right mold on the inner wall of the machine body, a left mold at the output end of the cylinder, and a pop-out mechanism inside the right mold. The feeding hopper includes a screw, a device block, a limiting rod, a funnel, an exhaust pipe, a fixing rod, and a flow channel. The screw is rotatably connected to the outer wall of the machine body. As the left mold contracts, the material moves towards the cylinder. At this time, the vibrating rod resets, causing the elastic column to strike the inner wall of the left mold, causing it to vibrate and fall into the dropping chamber below. This avoids the labor costs incurred during manual material handling, thereby improving production efficiency.

This utility model discloses a polypropylene extrusion molding device, relating to the field of plastic molding technology. The polypropylene extrusion molding device includes a polypropylene extrusion unit with a feed inlet. A first motor is fixedly connected to one end of the polypropylene extrusion unit, and a support frame is fixedly connected to the bottom of the polypropylene extrusion unit. When it is necessary to change to a different specification mold, the current to the magnetic conductor coil is cut off, causing the magnetic conductor to lose its magnetism and the magnetic attraction between it and the permanent magnet inside the mold to dissipate. At this time, the old mold can be directly removed. After replacing it with a new specification mold, the new mold is placed against the sealing plate and aligned with the extrusion hole. The magnetic conductor coil is then energized, causing it to regain its magnetism and re-establish magnetic attraction with the permanent magnet inside the new mold. The entire process requires no additional mechanical fixing structure; mold replacement can be quickly completed simply by switching the current on and off, significantly improving the device's adaptability to different product specifications.

The application provides a synchronous lifting type latex balloon forming device, which comprises a support frame, a driving mechanism, a transmission mechanism, a lifting mechanism, a latex tank and a mold. The driving mechanism comprises a driving motor and a driving wheel, the transmission mechanism comprises a synchronous belt, two driven wheels and two parallel ball screws, and the lifting mechanism comprises a synchronous plate, four vertical columns and a support. The driving motor drives the driving wheel, which is connected to the driven wheels through the synchronous belt, so that the two ball screws rotate synchronously, the synchronous plate, the vertical columns and the support are lifted, and the mold reciprocates along the axial direction of the first ball screw and the second ball screw from the initial position to the inner bottom groove of the latex tank. By controlling the operation time of the motor, stable lifting without shaking is realized, and the problems of uneven thickness and wavy lines of the balloon forming are solved.

The invention relates to the technical field of food packaging equipment, and provides partition plate type gasket automatic forming and boxing equipment which comprises an overturning feeding device, a folding forming device and a boxing device. The folding forming device comprises a pressing mechanism, a gasket conveying line and a jacking mechanism. The overturning feeding device is used for picking up the partition plate type gaskets in the flat state and overturning the partition plate type gaskets so that the partition plate type gaskets can be horizontally placed on the gasket conveying line. The gasket conveying line is provided with a hollow area, and the gasket conveying line is used for conveying the received partition plate type gaskets to the hollow area; the pressing mechanism and the jacking mechanism are oppositely arranged up and down relative to the hollow area; and the boxing device is used for picking up the partition plate type gaskets folded by the folding forming device and loading the partition plate type gaskets into the box body. According to the device, feeding, folding and boxing treatment of the partition plate type gaskets can be automatically carried out, personnel participation is not needed in the whole process, the packaging cost is reduced, and the folding and boxing efficiency of the partition plate type gaskets is guaranteed.

The present application relates to high pier construction technical field, specifically a kind of roller mould device for high pier construction, including main mould frame, several equipment supports being arranged on main mould frame, rolling device being arranged on equipment support;Rolling device includes the roller body assembly being arranged in the front of rolling device, and the recovery assembly being arranged in the rear of roller body assembly;Roller body assembly includes support frame, roller body being arranged on support frame, and the material scraping frame being erected on support frame;Material scraping frame is provided with material scraping machine piece, material scraping machine piece is inclined to the roller surface of roller body, and the side of roller body is moved towards material scraping machine piece;Recovery assembly includes the material receiving box being arranged in the rear of material scraping frame, the rear of material scraping frame is provided with guide frame plate, and guide frame plate is used to connect material receiving box and material scraping machine piece.The present application designs material scraping machine piece to separate the concrete on the roller surface of roller body, and concrete is collected in time, so that the construction process of overall high pier roller mould is more smooth.

The present disclosure concerns a molding apparatus including:a first thermally conductive flange and a second thermally conductive flange, said first and second thermally conductive flanges delimiting a cavity configured to receive thermoplastic pre-impregnated textiles,a mold thermally conductive and thermoregulated by a heat transfer fluid—comprising an upper impression and a lower impression, said upper and lower impressions being configured to receive said first and second thermally conductive flanges.

The invention discloses a cold heading forming device for a motor suspension metal framework, relates to the technical field of cold heading forming, and aims to solve the technical problems of low forming precision and single function. On the basis of external hydraulic pumping equipment, a planetary driving mechanism is matched, two output ends are arranged, a second-stage control shaft sleeve is pretreated through an annular bolt fastening assembly, so that a swing piston mechanism is subjected to inclination adjustment, and a forming mold A subjected to cold upsetting forming is subjected to annular sequential second-stage pressurization for further forming; according to the motor suspension metal framework high-precision forming method, the forming precision of the motor suspension metal framework is improved, emphasized pressurizing forming is conducted on one or more movable units of the forming die A, most of the cold heading deformation degree in the motor suspension metal framework is further formed in the mode, and high-precision forming treatment of the motor suspension metal framework is achieved in the mode. In this way, the functionality of the cold heading forming device is effectively improved.

Method for operating a forming device for forming plastic preforms into plastic containers, wherein the forming device (1) has a movable carrier (20) on which a plurality of forming stations (2) are arranged, wherein each of these forming stations in an operating operation forms plastic preforms (10) into the plastic containers by applying a flowing and in particular gaseous medium, wherein in the operating operation the plastic preforms are subjected to at least two different pressure levels for their expansion and at least two valves are used for this application, characterized in that at least a measured value is determined at least temporarily, which is characteristic for a switching time and / or a switching time delay of at least one of the valves, wherein this measured value results from a pressure measurement.