137results about How to "Slow down the closing speed" patented technology

A washing machine comprising a cabinet open at an upper portion, a top cover coupled to the upper portion of the cabinet and including an opening for loading and unloading laundry therethrough, a lid assembly rotatably coupled to the top cover to open and close the opening, and a first hinge unit connecting the lid assembly with the top cover and reducing a speed of closing the lid assembly is provided. In the washing machine, the closing speed of the lid assembly is reduced to mitigate shock between the lid assembly and the top cover.

The invention discloses a pinch resisting door for an automobile, which comprises a movable door and a door frame, wherein the movable door and the door frame are connected through a hinge; a hand pinch resisting device is arranged on the movable door; the hand pinch resisting device comprises a fluid cylinder, an electromagnetic valve, a limit switch and a controller; when a piston rod is in contact with the door frame, the rotation of the door can be hindered by utilizing the elasticity of a spring in the fluid cylinder, and the door closing speed is lowered; and when the movable door is closed until a limit rod of the limit switch is in contact with the door frame, the movement of a piston and the piston rod can be hindered by utilizing hydraulic oil sealed in a left cylinder of the fluid cylinder, the pressure of hydraulic oil boosts continuously to generate the flexible resistance force so as to hinder the movement of the piston and the piston rod, the piston rod is utilized to hinder the rotation of the movable door, the door closing speed is lowered, the time that a child withdraws a hand from the door frame can be prolonged, and the hand of the child can be protected from being injured by the door.

A system and method are provided for electrostatic discharge (ESD) protection circuit having overshoot and undershoot voltage protection during a power supply ramp-up of the circuit. In a specific embodiment, the ESD protection circuit of the present invention includes an ESD discharge circuit coupled between a power supply node and a ground supply node, a trigger circuit coupled to the ESD discharge circuit, the trigger circuit to turn the ESD discharge circuit on in the presence of a voltage spike during the power supply ramp-up and to turn the ESD discharge circuit off in the absence of a voltage spike during the power supply ramp-up, and a delay circuit coupled between the discharge circuit and the trigger circuit, the delay circuit to slow down the turn-off of the discharge circuit to prevent an overshoot or undershoot voltage condition during the power supply ramp-up of the circuit.

The invention discloses an operation device of a direct current circuit breaker and an operation method of the operation device. The operation device comprises a vacuum bubble, a repulsion device andan electromagnetic mechanism connected with the repulsion mechanism through a connection rod. A mechanical contact consisting of a static contact and a moving contact is arranged in the vacuum bubble.The moving contact is connected with the repulsion mechanism through an insulation pull rod. The repulsion mechanism comprises a separating coil, a repulsion disc, a charging / discharging loop and a first controller controlling the charging / discharging loop to trigger the separating coil. The repulsion disc is connected with the connection rod through a moving guidance rod. The separating coil isarranged on the repulsion disc and the gap is not more than 3.5 mm. The electromagnetic mechanism comprises an annular hollow static iron core, a moving iron core, an attracting coil, a keeping coil,a separating reset coil, a contact spring and a second controller.

The invention discloses a hinge device which has the functions of door stop, automatic door closing, cushioning for door closing and the like. A cam piston, which divides the space in an upper shell into an upper independent compartment and a lower independent compartment, is arranged in the upper shell of the hinge device; and the cam piston moves up and down when the door sheet is opened and closed, thereby driving hydraulic oil in the upper compartment and the lower compartment to flow back and forth in the two compartments. When the door is automatically closed, the cam piston moves down,the hydraulic oil should flow into the upper compartment from the lower compartment via a cushion valve; the action of the resistance of the cushion valve has the cushioning effect on closing door, thereby avoiding overhigh closing speed, lightening the violent impact between a door sheet and a door frame while closing the door, reducing the noise while closing the door, and prolonging the service lives of the door sheet and the door frame. In addition, a hydraulic mechanism does not abrade a mechanical cushioning mechanism, thus the invention has the advantages of stable cushioning effect and long service life.

A hinge assembly structure for opening and closing a door in a storage facility is provided. The hinge assembly structure includes a main body provided with a storage room, a door opening and closing the storage room on the upper portion of the main body, a hinge assembly connecting the door rotatably with the main body, and a hinge receptacle accommodating the hinge assembly, in which the hinge receptacle is integrally formed between the door and the main body. Here, the hinge assembly includes a plurality of rotating members which convert a rotational movement into a rectilinear movement according to opening and closing of the door, a fixing member which accommodates, supports and fixes the rotating members and operates in engagement with the rotating members, elastic members which give an elastic restoring force and an elastic repulsive force to the rotating members and restricting a rotational movement, and a fixed shaft which fixedly couples the rotating members, the fixing member, and the elastic members, in which the hinge assembly is inserted into and installed in the hinge receptacle via one side thereof. The hinge assembly structure is very simple and easy to be assembled with a main body, and also mitigates a closing speed of a door to prevent a mechanical impact during closing the door, and seeks stable opening and closing of doors via a secure assembly.

A hinge assembly structure for opening and closing a door in a storage facility is provided. The hinge assembly structure includes a main body provided with a storage room, a door opening and closing the storage room on the upper portion of the main body, a hinge assembly connecting the door rotatably with the main body, and a hinge receptacle accommodating the hinge assembly, in which the hinge receptacle is integrally formed between the door and the main body. Here, the hinge assembly includes a plurality of rotating members which convert a rotational movement into a rectilinear movement according to opening and closing of the door, a fixing member which accommodates, supports and fixes the rotating members and operates in engagement with the rotating members, elastic members which give an elastic restoring force and an elastic repulsive force to the rotating members and restricting a rotational movement, and a fixed shaft which fixedly couples the rotating members, the fixing member, and the elastic members, in which the hinge assembly is inserted into and installed in the hinge receptacle via one side thereof. The hinge assembly structure is very simple and easy to be assembled with a main body, and also mitigates a closing speed of a door to prevent a mechanical impact during closing the door, and seeks stable opening and closing of doors via a secure assembly.

A damping structure for drawers includes a front portion, a slide portion, a rear portion, at least one spring member and a damping unit. When a user closes a drawer, the push portion of the track presses against the positioning rod, and then the positioning rod is pushed out of the perpendicular slot and is moved backwards due to the restoring force exerted by the two spring members. Now, the fast backward motion of the slide portion may be damped and slowed down due to the damping effect of the damping unit, and hence the drawer may be closed at a reduced speed and in a steady manner.

The invention discloses a slow-closed rotary-opened type check valve capable of preventing waterproof hammer. The slow-closed rotary-opened type check valve is characterized in that an umbrella-shaped slow-closed device is further arranged between the back of a valve clack and a support. The umbrella-shaped slow-closed device comprises an elastic buffering device, an inner umbrella and an outer umbrella, wherein the inner umbrella and the outer umbrella are of disk-shaped structures, an overflowing hole is formed in the outer umbrella, an outer umbrella inner spherical face is arranged on the outer umbrella, the outer umbrella is fixedly arranged on a valve clack shaft, an inner umbrella outer spherical face and an inner umbrella inner spherical face are arranged on the inner umbrella, a guiding hole is formed in the inner umbrella, the guiding hole and the valve clack shaft are in axial movable fit, one end of the elastic buffering device is connected with the back of the valve clack, the other end of the elastic buffering device is connected with the inner umbrella inner spherical face, and the outer umbrella inner spherical face is tightly pressed by the inner umbrella outer spherical face. When the medium pressure on the inlet side of the valve is closed suddenly, the valve clack is slowly closed in a rotary mode. A sealing face is prevented from being damaged, water hammer is prevented from being generated, and the service life is long.

There is provided a method of driving an electromagnetic pump where noise and vibration that accompany abrupt fluctuations in pressure inside a pump chamber are reduced. A pulse voltage is applied alternately on a positive side and a negative side to drive the electromagnetic coil such that a change in voltage that occurs when the polarity of the pulse voltage is inverted has a continuous slope at least between the positive side and the negative side.

A passive exhaust valve assembly includes an exhaust conduit or pipe section with a valve plate or vane member that can pivot within the interior section or volume of the exhaust conduit to regulate the flow of exhaust gases through the exhaust conduit. A flexible bumper element, such as a metal mesh pad, may be positioned on the interior surface of the exhaust conduit, such that an end portion of the valve plate may contact the mesh pad in the closed position. The bumper element may be disposed in a recessed pocket or depression and may be biased inward, such as with a spring, for the end portion of the valve plate to contact the bumper element as it moves toward the closed position, and thereby gradually reduce the closure speed of the valve plate to the closed position.

The invention discloses a pulsator washing machine top cover with dampers. The pulsator washing machine top cover with the dampers comprises a top cover body and a folding cover, wherein the dampers are respectively arranged on two sides of the folding cover; one damper is a hydraulic type rotary damper, and the other damper is a spring type rotary damper. The torque produced by the spring type rotary damper at an initial phase is smaller, and due to the smaller torque, the initial speed of the folding cover is faster when the folding cover rotating downwards at the initial stage of the closure of the folding cover, so that the closure time of the folding cover is saved; larger torque is provided for the later period of the closure of the folding cover, so that the closure speed of the folding cover is slowed down, and the hidden danger that hands of customers can be injured due to overfast speed is avoided; while the hydraulic type rotary damper is good in stability and smaller in vibration during the folding cover rotary process, so that the folding cover can be downwards rotated to the closure state stably and quietly. According to the pulsator washing machine top cover with the dampers, the different dampers are adopted, and the advantages of a spring type rotary damper and a hydraulic type rotary damper are reasonably combined, so that the two dampers are mutually complemented to achieve better an automatic folding cover buffer closure effect.

A washing machine comprising a cabinet open at an upper portion, a top cover coupled to the upper portion of the cabinet and including an opening for loading and unloading laundry therethrough, a lid assembly rotatably coupled to the top cover to open and close the opening, and a first hinge unit connecting the lid assembly with the top cover and reducing a speed of closing the lid assembly is provided. In the washing machine, the closing speed of the lid assembly is reduced to mitigate shock between the lid assembly and the top cover.

The invention relates to the technical field of hinges, and discloses a refrigerator door hinge with a damping buffering structure. The refrigerator door hinge comprises a base used for connecting a refrigerator cabinet body, and a connecting rod used for connecting a refrigerator door, wherein the base is rotatably connected with a cam disc by virtue of a center pin shaft, one end of the connecting rod is provided with a connecting hole used for being connected with the refrigerator door, the other end of the connecting rod is connected with the cam disc by virtue of a first hinge shaft, thebase is provided with a cam jacking and pressing mechanism for controlling the rotating speed of the cam disc, and the cam jacking and pressing mechanism comprises a cam jacking and pressing head applying the pressure onto a cam surface of the cam disc; and the base is also provided with a damper for retarding the closing speed of the refrigerator door, the connecting rod is provided with a connecting rod extension section, and the end part of the connecting rod extension section is in contact with the damper when the refrigerator door rotation angle is smaller than or equal to a set criticalangle. By adopting the refrigerator door hinge with the damping buffering structure, the user experience to open and close the refrigerator door is improved, and the service life of products is prolonged.

The invention discloses an energy-saving type prior unloading valve which belongs to the technical field of hydraulic steering systems of engineering machinery. The energy-saving type prior unloading valve comprises a valve body, a prior valve core, a sliding valve, an unloading valve core and an LS control plug screw, wherein an oil channel CF, an oil channel P, an oil channel P2, an oil channel P1 and a return oil channel T1 are formed in a valve hole of the prior valve core; and the oil channel P2, a return oil channel T, an oil channel LS and an unloading safety valve guide return oil channel T2 are formed in a valve hole of the unloading valve core. A load sensing complete hydraulic steering hydraulic system is formed by the energy-saving type prior unloading valve together with a load sensing steering gear and a steering pump, the sliding valve is additionally arranged, and the movement of the sliding valve is controlled through the pressure of the steering gear LS, so that the divided and combined flow high / low pressure control is realized, and the steering prior is ensured; and when a loader is not steered, steering pump hydraulic oil is subjected to prior valve flow combination or load oil returning under the lower pressure, so that the pressure loss of the steering pump combination or the load oil returning in the working condition that the loader is not steered is reduced, the unnecessary energy loss of the system is reduced to the maximum extent, the oil temperature is lowered, and the energy saving effect is effectively achieved.

The invention provides an electromagnetic driving valve of an internal combustion engine provided with a significantly compact shock absorbing means which can reduce an impact sound and a vibration in a contact portion between a first transmission shaft and a second transmission shaft and reduce an impact sound and a vibration generated at a time when a valve portion sits on an intake and exhaust port at a time of closing a valve. A shock absorbing means (27) is provided between a first transmission shaft (14a) extended upward from a valve portion (3) and a second transmission shaft (14b) extended on the same axis thereof and supporting a movable plate (7) between a pair of electromagnets (5, 6). The shock absorbing means (27) is provided with a contact connecting means (28) connected to an upper end of the first transmission shaft (14a) and freely extending and compressing while maintaining a contact with a lower end of the second transmission shaft (14b), and an oil receiving portion (29) slidably inserting the contact connecting means (28) thereto and gradually discharging a fluid charged in an inner portion thereof together with an upward movement of the contact connecting means (28) at a time of a valve closing operation of the valve portion (3), thereby reducing a valve closing speed of the valve portion (3) via the first transmission shaft (14a).

A vehicle start power increasing device comprises a shell, an accelerator cable and a clutch auxiliary cable. Both the accelerator cable and the clutch auxiliary cable penetrate through the shell and are connected together, the shell internally comprises an upper chamber and a lower chamber, the accelerator cable and the clutch auxiliary cable penetrate through the two chambers respectively, the accelerator cable is connected with a tripping slider in the upper chamber, a jacking body is arranged on the lower portion of the tripping slider, a slot hole is arranged on a partition plate between the upper chamber and the lower chamber, and the jacking body slides in the slot hole and extends out downwardly. The vehicle start power increasing device is capable of synchronously increasing power of an engine along with engagement of a clutch when a vehicle load start or climbing start, and is capable of avoiding shaking or flameout of the vehicle. The vehicle start power increasing device increases power by ingeniously using return action of a clutch arm.

For a fuel gas feed and Ignition apparatus for a gas engine (1) with a combustion chamber injection nozzle (12) in which a number of injection channels (37) are provided for a main fuel gas, and the injection channels (37) are connected to a main fuel gas feed line (24) for main fuel gas in which a main fuel gas valve (21) is arranged, and in which combustion chamber injection nozzle (12) are also provided a number of torch channels (52) for hot combustion gas and the torch channels (52) are connected to a pre-combustion chamber (15) in the fuel gas feed and ignition apparatus (10), wherein an ignition fuel supply line (17) leads to the pre-combustion chamber (15) and a pre-combustion chamber valve (18) is arranged in the ignition fuel supply line (17), control of both the time and the duration and thus also the quantity of the injection of main fuel gas, as well as of Ignition fuel for the pre-combustion chamber completely independently of one another and in a precise and, above all, rapid manner is achieved in that both the main fuel gas valve (21) and the pre-combustion chamber valve (18) are embodied as an electrically actuated, electronically controlled valve.

A damper of furniture comprises a piston and a damp plate which are sequentially connected in a cylinder. One end of a piston rod extends into the cylinder and is connected with the piston after penetrating through the damp plate; the piston is provided with more than one flow-passing hole, or the outer side of the piston is provided with more than one first flow-passing groove; one side of the damp plate, opposite to the piston, is provided with an annular step; a certain oil-passing gap is retained between the piston and the inner wall of the cylinder and between the damp plate and the inner wall of the cylinder; one end of the piston rod, connected with the piston, is in a T shape and is connected with the piston as a whole. The damper can be arranged in a pivoted arm, rotates flexibly and can not easily loose. When a door is closed, the damper has strong impact resistance, can effectively slow down the closing speed and reduce the collision sound generated by closing the door, andthe door is opened without any influence. The invention has simple and reasonable structure, low manufacture cost and long service life.

The invention discloses a slow-closing device for an automobile door and a control method thereof. When the closing speed of the automobile door is too high, on the premise that the automobile door can still be closed normally, redundant kinetic energy of the automobile door is used for driving a power generator of the slow-closing device to generate power, then electromagnets are driven by the electric energy to work, force for preventing closing is applied to the automobile door at the moment the automobile door is closed, the closing speed of the automobile door is decreased, and vibration and noise generated at the moment the automobile door is closed are reduced. The slow-closing device for the automobile door mainly comprises an execution mechanism, an energy conversion mechanism, a transmission mechanism, a detection mechanism and an electronic control unit, wherein the electronic control unit controls the power generator to work according to the opening angle and the angular speed of the automobile door, the slow-closing device for the automobile door is made to generate corresponding force used for preventing the automobile door from closing according to different angular speeds of the automobile door, and finally the purposes of reducing vibration and noise generated at the moment the automobile door is closed and improving the comfort of passengers in an automobile are realized.

The invention discloses a using method of an intelligent automatic household door. The intelligent automatic household door comprises a movable door, a door frame, a signal emitting device, a signal receiving device and an anti-clamping device, wherein the movable door is connected with the door frame; the signal emitting device is mounted on the movable door; the signal receiving device and the anti-clamping device are mounted on the door frame; the anti-clamping device comprises an anti-clamping electromagnetic bolt, a positioning electromagnetic bolt and a housing; the anti-clamping electromagnetic bolt comprises an anti-clamping bolt, an anti-clamping spring and an anti-clamping electromagnet; the positioning electromagnetic bolt comprises a bolt sleeve, a locking bolt, a positioning spring and a positioning electromagnet; the locking bolt is opposite to the positioning hole of the anti-clamping bolt; when the movable door is quickly closed, the signal is transmitted to the signal emitting device through an inertia switch, the signal emitting device is used for transmitting the signal to the signal receiving device, the signal receiving device controls the anti-clamping bolt to extend out to jack the movable door; and meanwhile, mutual repulsive force of electromagnetic force of the anti-clamping electromagnet and magnetic force for fixing a magnet is utilized to prevent the movable door from being closed, so that the movable door is prevented from injuring children by clamping.

The invention discloses a door hinge. The door hinge comprises a fixed machine body, a linkage assembly, a movable machine body and a self-closing mechanism; a first connecting shaft and a second connecting shaft are arranged in the fixed machine body in the length direction; the two ends of the linkage assembly are hinged to the fixed machine body and the movable machine body correspondingly; a sliding block capable of sliding in the depth direction of the movable machine body is arranged in the movable machine body, one end of the sliding block is hinged to one end of the linkage assembly, and one side of the sliding block is provided with a track straight face and a track inclined face inclining towards the interior of the sliding block; the self-closing mechanism is arranged on the side, close to the track straight face, in the movable machine body and is of a telescopic structure, one end of the self-closing mechanism abuts against the side face of the sliding block, and when the end of the self-closing mechanism abuts against the track inclined face, the sliding block is driven to slide towards the interior of the movable machine body. The door hinge is a concealed hinge and meanwhile has an automatic closing function.

The invention discloses a door pinching prevention device. The door pinching prevention device is provided with a pinching prevention device which is provided with a damping cylinder and a control cylinder; the damping cylinder and the control cylinder contain hydraulic oil; when strong wind blows a movable door to ensure that the movable door and a door frame are approximately closed, a second piston of the control cylinder is moved to the position for sealing a second left joint by the second piston, and then the hydraulic oil is sealed in a first left cavity of the damping cylinder and a second left cavity of the control cylinder; with continuous closing of the moving door, the pressure of the hydraulic oil sealed in the first left cavity of the damping cylinder and the second left cavity of the control cylinder is continuously increased so as to stop a first piston and the second piston from moving. The door pinching prevention device disclosed by the invention has the advantages that a door frame is supported by utilizing a first piston rod and a second piston rod, so that the impact force in opening and closing the moving door is reduced, the door closing speed is reduced, and children or old people are prevented from being pinched by fast closing of the moving door.

A hinge assembly for a door of a kimchi storage device is disclosed. The hinge housing of the hinge assembly contains a supporting member, which is provided on its upper surface with a 1st contacting face which inclined upward at a definite angle from the side of a cover plate and sliding a press roll in the opening of the door and a 2nd contacting face which continuing from the top of the supporting member to the opposite side of the 1st contacting face, inclined downward at a definite angle from the side of the cover plate and sliding the press roll in the closure of the door. The invention provided a hinge assembly which can keep the door closed stably by the two contacting face capable of preventing the door cocking from the main body, and effectively preventing the leakage of cold air from the storage chamber. Concretely, the supporting member is provided on its upper surface with a 1st contacting face 62a inclined upward at a definite angle from the side of a cover plate 33 and sliding a press roll in the opening of the door and a 2nd contacting face 62b continuing from the top 62c of the supporting member to the opposite side of the 1st contacting face 62a, inclined downward at a definite angle from the side of the cover plate 33 and sliding the press roll in the closure of the door.

The invention relates to a slow-closing swing type non-return valve. The slow-closing swing type non-return valve is characterized in that the lower end of a rocking bar is fixedly connected with theupper end of a non-return valve flap, the back surface of the non-return valve flap is internally provided with an upper piston cavity, a lower piston cavity and an inclined piston, the inclined piston is of an I-shaped structure, the center of the inclined piston is provided with a guiding hole, the upper end of the inclined piston stretches into the upper piston cavity, the outer circle of the upper end of the inclined piston and the inner wall of the upper piston cavity form one moving seal structure, the lower end of the inclined piston stretches into the lower piston cavity, the outer circle of the lower end of the inclined piston and the inner wall of the lower piston cavity form one moving seal structure, the inclined piston is internally provided with an overflow hole communicatingwith the upper piston cavity and the lower piston cavity, the upper piston cavity and the lower piston cavity are internally provided with buffer liquid correspondingly, the inner cavity of a valve seat is provided with a strengthening tibia, a chamber is further internally provided with a guiding rod, one end of the guiding rod is fixedly arranged at the strengthening tibia, the other end of theguiding rod obliquely upward stretches to an outlet flow passage, and the outer circle of the guiding rod and the inner wall of the guiding hole form one moving seal structure. The slow-closing swingtype non-return valve has the advantages that a sealing surface is prevented from damage by impact, forming of a water hammer is prevented, and the service life is long.

Vacuum circuit breakers are to gain an extended lifetime by reducing contact face damage of moving and fixed electrodes with improved voltage withstand performance therebetween and enhanced interruption performance. Vacuum circuit breaker of the present invention has bulb 10 having: insulative vacuum tube 11; and fixed electrode 12 on end of current-carrying conductor 13 and moving electrode 15 on end of another current-carrying conductor 16 arranged in insulative vacuum tube 11 with their electrode contact faces opposed each other. Operation system for manipulating current-carrying conductor 16 of moving electrode 15 is equipped with compression-spring 20 and auxiliary compression-spring 21 that increases initial opening speed of moving electrode 15. Auxiliary compression-spring 21 ceases energizing in the middle of a circuit breaking movement of moving electrode 15 and begins storing spring energy in the middle of a circuit closing movement of the same.

A magnetically-triggered lock mechanism for interengaging two relatively movable components. The lock mechanism includes a bolt mounted within a first component composed of a first material and displaceable between retracted and extended positions to interengage with a second component when the first and second components are in a predetermined position relative to each other and the bolt is extended, and a magnetically-releasable latch mechanism positioned to latch the bolt in a retracted position, the latch mechanism including a first magnet and mounted for movement between a biased latch engaging position and a latch releasing position. A support collar composed of a second material having higher strength than that of the first material is disposed around the bolt between an inner casing and outer casing of the first component and is spaced from the bolt to allow for sliding movement of the bolt through the support collar as the bolt moves between the extended and retracted positions. The support collar absorbs and distributes to the inner and / or outer casing a load generated from the bolt as the bolt moves to the extended position through the support collar. A second magnet is positioned to displace the latch mechanism to the latch releasing position when the first component is in the predetermined position relative to the second component.

The invention relates to a fluid end device of a plunger pump. The fluid end device of the plunger pump comprises a pump head body (3), a cartridge combination valve (12), a stuffing box (7) and a plunger (10). The pump head body (3) is provided with a suction inlet and an exhaust outlet, and the cartridge combination valve (12) is arranged inside the pump head body (3); a liquid inlet cavity (1213) communicated with the suction inlet and a liquid outlet cavity (1215) communicated with the exhaust outlet are formed between the pump head body (3) and the cartridge combination valve (12); the end surface of the stuffing box (7) is closely adhered to the pump head body (3), and the plunger (10) can move inside the stuffing box (7) in a reciprocating mode; the cartridge combination valve (12) comprises a pressing sleeve (1201), a valve core (1206), a suction valve (1208) and a discharge valve (1205). The fluid end device of the plunger pump improves the overflowing performance of the combination valve and the guide performance between the suction valve and the valve core and meanwhile is compact and simple in structure; the pump head body is small in size; the fluid end device of the plunger pump is high in volume efficiency, easy to assemble and disassemble and rapid in maintenance and replacement.

The present invention relates to the technical field of spring hinges, and to a gear structure spring hinge, which addresses the technical shortcoming that a closing speed is excessively high when an existing spring hinge used in a household appliance drives a cabinet door to close. The gear structure spring hinge comprises a fixing base and a hinge arm, the fixing base being connected to a first gear through a first gear shaft, a crank shaft being provided on a gear surface of the first gear, the crank shaft being movably connected to a pull rod, a spring assembly being sleeved on the pull rod, a front end of the spring assembly being mated with and snap-fitted to the fixing base; and the hinge arm includes a connecting arm and a second gear, the second gear being provided on an end of the connecting arm, the second gear and the connecting arm forming an integral structure, the second gear being connected to the fixing base through a second gear shaft, the second gear being meshed with the first gear. Compared to the existing spring hinge, by means of the present invention, the closing speed of the cabinet door is effectively reduced, and an effect of damping is achieved, such that the cabinet door is closed in a more stable manner, and a force of the spring assembly is not affected after the spring assembly drives the cabinet door to close. The present invention is particularly suitable for use on such products as ovens and microwave ovens.