39results about How to "Avoid Shock Phenomena" patented technology

The invention provides balanced valve which comprises a main valve body (1) and a main valve core (4), wherein the main valve body (1) is provided with a positive oil outlet (A) and a reverse oil outlet (B); the main valve core (4) comprises a first acting surface (A1) and a second acting surface (A2) which are opposite to each other; the first acting surface is exposed in a first acting cavity (3) communicated with the reverse oil outlet; the second acting surface is exposed in a second acting cavity (17) communicated with the reverse oil outlet through a dumping groove (5); and the balanced valve further comprises a guiding control module which enables the second acting cavity to be selectively communicated with an oil draining port through a guiding control oil port (X). In addition, the invention also provides a hydraulic cylinder expansion control loop and a hydraulic crane. Due to the guiding control method, a large control ratio can be obtained through controlling the size of a guiding piston rod, the descending speed limitation control of the balanced valve is more sensitive, the influence of the load pressure on the openness of the main valve core is slight, frequent shaking can not be generated, the work stability is good, and the energy-saving effect is excellent.

The invention relates to a chambering and detaching tool for a pin roll with a countersink at one end. When the pin roll is chambered, a chambering pin is mounted in a screw, a pin roll is clamped between a blanket and the chambering pin, and the countersink of the pin roll is chambered through the chambering pin through a spiral movement of the screw. When the pin roll is detached, the blanket, a washer, a screw and the chambering pin are detached, an ejector pin is mounted in the screw, and the ejector pin ejects the pin roll out of a mounting part through the spiral movement of the screw. Compared with other accomplishing means, the hole expanding and detaching processes are accomplished by one person; the hole expanding hole is steady, and the product is not impacted; the hole expanding extent is controllable, and the orifice is free of a cracking phenomenon; with adoption of a replaceable pressure head, the application range of the tool is expanded, and the tool is simple and feasible, and the labor cost is saved and the production efficiency is improved.

The invention discloses an electrically modulated proportional throttle control valve comprising a main valve, a pilot control assembly and an electromagnet, but the connection form of the valve is a threaded type, so that the whole structure is simple, the size is small, the weight is light, the positive effects of compactness, high-efficiency and energy-saving of a hydraulic system are achieved conveniently, and meanwhile, the manufacturing cost is also greatly reduced, so that the valve is more likely to be accepted by the market.

A power gear-shifting speed-change control system comprises a stop valve, a reversing operating valve, a forward gear clutch, a backward gear clutch, a speed-change operating valve and a speed-change clutch. A shuttle valve is arranged between the reversing operating valve and the speed-change operating valve, a cushion valve is arranged between the speed-change operating valve and the speed-change clutch, oil sequentially passes through the stop valve and the reversing operating valve to flow to the forward gear clutch or the backward gear clutch, two oil outlets of the reversing operating valve are connected with two oil inlets of the shuttle valve respectively, and an oil outlet of the shuttle valve is connected with an oil inlet of the speed-change operating valve. The power gear-shifting speed-change control system has the advantages that whether buffering is performed is determined according to the pressure building characteristics of every clutch, different pressure building characteristics can be obtained according to every speed gear and different requirements of different machine types, and accordingly gear pressure control systems do not influence each other.

The invention provides a manual control valve of a harvester and belongs to the technical field of hydraulic pressure. The manual control valve of the harvester solves the problem that an existing manual control valve of a harvester is poor in control stability and control accuracy degree. The manual control valve of the harvester comprises a valve body; a first reserving control valve and a second reserving control valve are connected with an oil inlet and an oil returning port in a series-parallel connection manner; a first control oil way of the first reserving control valve can be communicated with a first control oil port in the valve body; fixing throttling holes are formed in the first control oil way; a communicating oil way is further arranged on the first reserving control valve; the second reserving control valve is provided with an oil supplying oil way and an oil inflow oil way which is provided with throttling small holes; a second control oil way and a third control oil way of the second reserving control valve can be communicated with a second control oil port and a third control oil port in the valve body correspondingly; the second reserving control valve is further provided with a turning-connection oil way communicated with a turning-connection oil port in the valve body; and the oil supplying oil way and the turning-connection oil way are connected through a flow pressure control valve. The manual control valve of the harvester improves the control precision and the control stability.

The invention discloses a pressure ulcer prevention medical bed. In order to accurately judge the lying posture, the lying position and the like of a patient, a first sensor and a second sensor are adopted, and the first sensor and the second sensor are used for sensing the magnitude of stress transmitted from the body of the patient when a working rod works leftwards, rightwards, upwards and downwards. Along with the movement of the working rod, the bedspread wraps the patient, a series of actions such as lying flat, lying left, lying flat, lying right, lying flat and hanging lying are automatically carried out according to a set program and a set cycle period, and the pillow is always kept in a state of resting on the head of the patient. In addition, the massage mechanism can massage the back of the patient, a cold and hot air blower is arranged below the bed cover to blow comfortable air to the patient, and the patient with limb movement inconvenience can be automatically lifted tothe bed and can also be lifted to the ground under the condition that no nurse exists. The medical bed can also be used as a rocking bed for children, and adults can be used as a hammock. And the curtain type baby diapers are rolled on the roller shutter barrel, so that the baby diapers can be replaced in a full-automatic manner.

The invention discloses a damper of an automobile damping mechanism, which is provided with a bottom cylinder body and a piston which is arranged in the cylinder body in a free reciprocating motion type and has the same shaft with the cylinder body; the bottom cylinder body consists of a damper body and a top cover; the piston consists of a piston rod which passes through the top cover and a bottom surface part which is matched with the damper body; the internal wall of the damper body is uniformly provided with a plurality of curve troughs which are convex in the middle, concave at two ends and symmetrical at the left and the right along the direction of the axis line; the curve formula of the curve troughs is that y is equal to a multiplied by the absolute value of x<3>; wherein, a is less than 1 and more than minus 1; furthermore, the more the quantity of the curve troughs is or the greater the inflation pressure in the damper body is, the greater the coefficient a is; the shape of the bottom surface part of the piston which moves up and down along the curve troughs is corresponding to the shape of the internal chamber of the damper body at the center of the curve troughs. The invention has the advantages that the structure is simple, the application and operation are simple, the invention can effectively relieve the problem of excessive acceleration which is also the impact and jounce problem of the vehicle body which is caused by the change of the upper and lower speed of the vehicle body, and the discomfort of the passengers is greatly lightened.

The invention discloses a speed classification system for crane balance weight oil cylinder synchronous movement and a crane. The speed classification system for adjusting oil cylinder synchronous movement comprises a first reversing valve, a second reversing valve, a first oil port, a second oil port, a flow dividing and collecting valve and damping parts. The flow dividing and collecting valve comprises a first flow dividing port, a second flow dividing port and a flow collecting port, the flow collecting port communicates with the first oil port, the first flow dividing port communicates with a first connector of the first reversing valve, a second connector of the first reversing valve communicates with a rodless cavity of a first oil cylinder, and a third connector of the first reversing valve passes through the corresponding damping part and then communicates with the rodless cavity of the first oil cylinder. The second flow dividing port communicates with a first connector of the second reversing valve, a second connector of the second reversing valve communicates with a rodless cavity of a second oil cylinder, and a third connector of the second reversing valve passes through the corresponding damping part and then communicates with the rodless cavity of the second oil cylinder. The second oil port is used for communicating with a rod cavity of the first oil cylinder and a rod cavity of the second oil cylinder. According to the system, two-oil-cylinder synchronous movement speed classification control and synchronous control are achieved through the flow dividing and collecting valve, the two damping parts and the two reversing valves.

The invention provides a quick reset device for a derailed vehicle, which includes a bottom plate, a slide plate, a transmission screw, a screw nut, a rolling body and a hydraulic crane. First place the bottom plate welded with the positioning retaining ring and the positioning frame under the derailment car body, then place the slide plate on the rolling body, connect the transmission screw in the nut, and then place the hydraulic crane in the middle of the slide plate. Manually raise the hydraulic crane to lift the derailed vehicle to an appropriate height; use the lever to pull the transmission screw to rotate, and drive the slide plate through the screw nut to move forward or backward together with the derailed vehicle body lifted by the hydraulic crane until Push the derailed car body to the position where it returns to the track; then manually return the hydraulic crane to slowly drop the derailed car body onto the track. The invention is safe and reliable, convenient and quick to operate, time-saving and labor-saving, fast in reset speed, high in operating efficiency, controllable in lateral movement of the vehicle, can avoid accidents of personal injury and equipment damage, and ensures continuity of production.

The invention discloses a self-lubricating floating sandwich channel type electrified railway power transmission system, and belongs to the technical field of contact current transmission. The system comprises two self-lubricating floating channels, a self-lubricating conducting plate and a three-dimensional supporting protective cover; the self-lubricating conducting plate is located in the three-dimensional supporting protective cover, and therefore the problem that the current-receiving quality of a railway vehicle is influenced by unfavorable natural conditions is avoided; the self-lubricating conducting plate is made of conductors such as copper, aluminum and steel, and therefore the problems of metal-impregnated carbon sliding plate impacting and block falling are avoided; in addition, due to the fact that the back sides of the two self-lubricating floating channels are both supported by springs, the impact phenomenon generated when the self-lubricating conducting plate enters the space between the two self-lubricating floating channels is avoided, the service life of a current collector is prolonged, and the driving safety is guaranteed.

The invention discloses a vacuum shock protection method for an ion implantation apparatus, which is used for a process of feeding a process gas into an ion source vacuum cavity. The method uses an ion source vacuum height gauge, a gas-feeding pipeline pressure sensor, a gas-feeding isolation valve, branch isolation valves and a mass flowmeter and belongs to the field of manufacturing of semiconductor devices. The method comprises the following steps: selecting an SDS low-pressure gas bottle specified by the process, setting the mass flowmeter to zero, opening the branch isolation valve corresponding to the gas bottle, opening the gas-feeding isolation valve for a while, closing the gas-feeding isolation valve for a while, monitoring the ion source vacuum height gauge in the opening and closing processes to avoid vacuum breaking of the ion source, repeating the opening and closing processes in such a manner until the detection value from the pressure sensor is less than the set value while opening the gas-feeding isolation valve, and setting the mass flowmeter to the initial value set in the process, and thus preventing residual gas in the gas-feeding pipeline and gas leaking out of the mass flowmeter from causing shock breakage on the ion source vacuum.

The invention relates to an axle control type brake control system and a rail transit vehicle, the axle control type brake control system comprises an electronic brake control unit and a pneumatic brake control unit, the pneumatic brake control unit comprises a main gas circuit, and an emergency brake adjusting module, a service brake and anti-skid adjusting module and a remote relieving module are arranged on the main gas circuit. The emergency braking adjusting module comprises a pressure reducing valve and a first electric proportional valve, the service braking and anti-skid adjusting module comprises a second electric proportional valve, and the remote relieving module comprises a first electromagnetic valve and a second electromagnetic valve. The air inlet end of the main air path is used for being connected with a main air pipeline, and the air outlet end of the main air path is used for being connected with a basic braking unit. Precise control over the braking force of the train can be achieved, the service life of each valve in the control system is longer, the number of parts is smaller, the size is smaller, the system is more simplified, the weight is lighter, the response time of braking control can be greatly prolonged, and train operation can be safer.

The invention relates to the field of durometer calibration, in particular to a shore durometer test force calibration device, which comprises: a special calibration rack, wherein the special calibration rack comprises a base and a lead screw nut transmission mechanism, the nut transmission mechanism is composed of a handle, a lead screw, a nut and a clamp, the clamp is arranged on the lead screwthrough the nut, and the handle drives the lead screw to enable a to-be-measured piece to move downwards to contact with a force measuring sensor; the force measuring sensor which is arranged on the base and is placed under a shore durometer to be measured; and a high-precision digital dynamometer which is connected with the force measuring sensor through a cable and is used for reading a numerical value. According to the invention, the shore durometer is fixed on the clamp, and the handle is shaken to drive the lead screw to rotate so as to enable the test force to be slowly and stably applied to the shore durometer, so that the impact phenomenon in the stress application process can be avoided, and the shore durometer can be kept fixed when the test force is applied to a rated force value.

Aiming at the shortcomings in the prior art, the present invention designs an electric control device specially used for the forward-moving rotary parking equipment of the upper platform. The device is used to detect the state of the upper table and implement operation control on the lifting motor, moving motor and rotating motor. It uses a frequency conversion device to drive the lifting motor, moving motor and rotating motor separately in time-sharing, and uses a rotary encoder to accurately monitor the operation of the upper table. It even replaces the traditional travel switch for control. The device includes a state detection component, a motor drive component and a main control component, which can improve the intelligence of the equipment and avoid the impact phenomenon when the motor starts and stops; it can effectively improve the operation safety of the equipment and the service life of the electromechanical device of the equipment. The device uses a single-chip microcomputer main control chip, which has stronger adaptability to the matching man-machine interface device and safety device, and can even achieve dynamic monitoring and disposal of loads. Popularization and use of the present invention will have higher social and economic benefits.

The invention discloses an electronic proportioning valve. The electronic proportioning valve comprises a proportioning valve body, the proportional valve body comprises a valve body and a conical upper cover; an air inlet cavity and an air outlet cavity which are communicated with each other are formed in the valve body; a valve element assembly used for controlling the opening degree of the valve body is arranged between the air inlet cavity and the air outlet cavity. A bottom cover is connected to the bottom of the valve body in an embedded mode. The valve element assembly is elastically installed on the bottom cover. A piston cavity is formed in the top of the valve body; a piston is arranged in the piston cavity in a sliding manner; one end of the valve element assembly extends into the piston cavity and is connected with the piston in an abutting mode. A pre-pressing device used for adjusting the preset threshold value of the piston is arranged in the upper cover. The side end of the upper cover is provided with an air valve with an air inlet or air outlet function; the outer side wall of the valve body is provided with a barometer used for detecting the pressure of gas in the gas outlet cavity. The electronic proportioning valve is simple in structure and high in control precision, stepless adjustment of pressure can be achieved, and the impact phenomenon during reversing of a switch type air valve is avoided.

The invention discloses a power distribution cabinet applied to a high-humidity environment, and belongs to the field of power equipment. The power distribution cabinet applied to a high-humidity environment comprises a cabinet body, a base arranged on the lower side of the cabinet body, and an anti-static mesh cover arranged on the outer side of the cabinet body. Installation outer edges are integrally formed on the left and right sides of the base. Installation holes are formed in the four corners of the installation outer edges. Installation clamping blocks are connected to the four cornersof the bottom of the anti-static mesh cover. The bottom of each installation clamping block is connected with a grounding insertion rod. A bearing net plate is arranged on the lower side in the cabinet body. A fixing plate is arranged at the bottom in the cabinet body. A cavity is formed in the fixed plate, and a plurality of ventilation openings are formed in the upper side of the fixing plate and are communicated with the cavity. A dust cover is arranged on the inner wall of the right side of the cabinet body. Continuous dehumidification of the interior of the cabinet body can be realized,and static electricity generated during working of the cabinet body can be eliminated to improve the safety. Moreover, the power distribution cabinet is convenient to install, position and use, and has good damping and buffering effects and high stability.

The invention provides a structure of a swing valve driving oil cylinder of a concrete pump. A plunger is arranged in a cylinder body; a cylinder cover is arranged at the bottom of the cylinder body; a compression spring is arranged in a blind hole formed in the middle of the plunger; a collision block is fixedly mounted at the outer end of the spring; and a collision rod is mounted and fixed in the middle in the cylinder cover through a bolt. According to the invention, impact phenomenon and damages due to the impact phenomenon in the working of the traditional swing valve driving oil cylinder of the concrete pump can be overcome.