75 results about "Mechanical overload" patented technology

An arrangement and method for converting an input signal into a mechanical or acoustical output signal by using a transducer and additional means for generating a desired transfer behavior and for protecting said transducer against overload. Transducers of this kind are for example loudspeaker, headphones and other mechanical or acoustical actuators. The additional means comprise a controller, a power amplifier and a detector. The detector identifies parameters of the transducer model if the stimulus provides sufficient excitation of the transducer. The detector permanently identifies time variant properties of the transducer for any stimulus supplied to the transducer. The controller provided with this information generates a desired linear or nonlinear transfer behavior; in particular electric control linearizes, stabilizes and protects the transducer against electric, thermal and mechanical overload at high amplitudes of the input signal.

A circuit and method provides for the protection of transducers from over excursion, particularly for the protection of transducers for audio loudspeakers. A frequency dependent excursion limiter circuit has an initial summing stage followed by a shaping filter stage. A clamping function is provided at the summing stage, or at a separate stage between the summing stage and the shaping filter stage, for clamping the driving signal at a predetermined maximum voltage if the driving signal exceeds the predetermined maximum voltage level. The shaping filter stage provides a frequency response shaping function based on a predetermined frequency response shaping criteria which is related to the frequency dependent excursion limits of the transducers being protected from mechanical overload. An inverse shaping filter function is provided at the initial summing stage by providing feedback from the shaping filter stage, thus eliminating the need for a separate inverse shaping filter circuit before clamping. The inverse shaping filter function allows low level signals below clamping to pass through the circuit unaffected.

A frequency dependent excursion limiter circuit is also provided in the closed loop circuit of servo feedback system for protecting transducers in a servo feedback system from over excursion.

The invention relates to a cantilever beam acceleration transducer manufactured by micro-machining on a single side of a single silicon chip and a manufacturing method. The acceleration transducer is characterized in that: an accelerometer is manufactured by micro-mechanical single side machining through the single silicon chip, so that stress caused by the bonding process of a plurality of chipsand different materials is avoided. In order to realize a single side-machined cantilever beam sensitive structure, the cantilever beam structure is released by transversely etching the bottom of thecantilever beam by an anisotropic corrosion method after deep structural etching. The structure provides air squeeze-film damping and mechanical overload protection in a sensitive direction, solves the problem of the absence of air squeeze-film damping in the vertical sensitive direction of the conventional structure and prevents parasitic signal interference caused by structural resonance in thevertical direction. The acceleration transducer has the characteristics of particular suitability for measuring a high g value, simple structure, small size of the chip and the like. Simultaneously, a single side process can use low-cost single throwing silicon chips, is suitable for low-cost mass manufacturing and has higher performance and wide application prospects.

This invention relates to a drive unit for driving a ring gear, comprising a motor, a transmission and a drive shaft, on which a pinion is arranged for driving the ring gear, wherein the drive unit includes a mechanical overload protection. In accordance with the invention the overload protection is arranged between the transmission and the pinion.

The invention discloses a method, system and device for monitoring mechanical structural parts by using RFID tags, which can be used for fixed-length or fixed-shaped fasteners that bear tension, compression, twisting, shearing and other forces in mechanical devices that bear mechanical and motion loads , to monitor. This solution uses RFID tags with customized shapes, and uses the characteristics that the communication status of RFID tags is extremely sensitive to changes in circuit or antenna size and shape, to form a solution to the small displacement, looseness, loss, Real-time perception and detection of fracture and other states can achieve real-time monitoring of the safety status of mechanical devices. By adopting this scheme, the positioning and continuous monitoring of key fasteners or structural parts in the mechanical device can be carried out at low cost, and an alarm can be issued in time to avoid further damage to the faulty structure and cause catastrophic accidents. This solution is suitable for monitoring scenarios of various mechanical devices including heavy-duty mechanical devices involving personal safety.

Described herein is a miniaturized and ruggedized wafer level MEMS force sensor composed of a base and a cap. The sensor employs multiple flexible membranes, a mechanical overload stop, a retaining wall, and piezoresistive strain gauges.

A vehicle component with at least two connection points, a structural component that extends between the connection points and rigidly connects them with one another. The structural component comprises at least one insert made of a ductile material and at least two connection zones that support or form the two connection points, at least one of the zones comprises plastic. The structural component comprises at least one intermediate section that connects the two connection zones rigidly to one another and comprises the insert or is formed by the insert, this section is more ductile than at least one of the two connection zones and, in relation to a mechanical overload of the structural component, forms a locally delimited weak-point or region.

The invention discloses a numerical control tool rest cutting overload protection device. The protection device comprises a drive-side shaft sleeve, steel balls, a reset shaft sleeve, cylindrical stopping blocks, a left pushing plate, long springs, short springs, long spring sleeves, short spring sleeves, a right pushing plate, a driven-side shaft sleeve and an adjusting shaft sleeve; one side of the driven-side shaft sleeve is connected with the drive-side shaft sleeve, and the other side of the driven-side shaft sleeve is connected with the adjusting shaft sleeve; the reset shaft sleeve is located on the outer side of the driven-side shaft sleeve; grooves are formed in the end face of the drive-side shaft sleeve, first steel ball holes are formed in the driven-side shaft sleeve, the steel balls are arranged in the first steel ball holes, and when torque needs to be transmitted, the steel balls are pressed into the grooves of the drive-side shaft sleeve through the springs. According to the numerical control tool rest cutting overload protection device, the fault removing process is simplified by adopting a mechanical overload protection mechanism; through a critical force adjusting mechanism composed of the springs and the pushing plates, the magnitude of critical force can be changed, and the reliability and the practicability of the overload critical force adjusting mechanism under a certain threshold value can be guaranteed.

In a handheld power tool having a reduction gear unit, drivable by a motor, for driving a drive shaft, the reduction gear unit being situated in a gear housing and being shiftable via a gearshift at least between a first gear having a comparatively high torque and a second gear having a comparatively low torque, the reduction gear unit is assigned a mechanical overload protection device which is designed to limit the reduction gear unit during operation of the handheld power tool, if a torque, transferred from the drive shaft to the reduction gear unit, exceeds a machine-specific limiting value.

Mechanical overloads in a reciprocating gas compressor can cause irreparable damage to compressor components if the source of the overloads is not repaired. A method of detecting mechanical overloads includes applying an overload indicator across an interface between components in the compressor, and observing a mechanical condition of the overload indicator. The mechanical condition of the overload indicator is indicative of whether the compressor experienced a mechanical overload. By placing the indicator in an appropriate location in the compressor, overload conditions can be checked during routine inspections and maintenance checks.

The invention discloses a forced grass-crushing and feeding anti-blocking method and device after a round baler picks up materials, and relates to the technical field of straw harvesting and baling. By adopting a double anti-blocking protective technology that the openness of a lower jaw is adjusted by using a controller and a mechanical overload protection device is arranged, when the controller commands the movable lower jaw to enlarge the openness so as not to alleviate the load of a roll shaft of a spiral cutter or the controller fails, a safety bolt is sheared off so as to realize overload protection of the forced grass-crushing and feeding device. The device is capable of uniformly crushing and feeding grass and effectively preventing the feed inlet from being blocked, and is safe and reliable to use; and the operational efficiency of the round baler is improved.

The invention relates to a mechanical overload protection device, which comprises a driving gear shaft, an overload protection part and a driven ring gear. The driving gear shaft is provided with the first transmission teeth distributed along its circumference, the first arc-shaped groove is formed between the adjacent first transmission teeth, the arcs of the adjacent first arc-shaped grooves are tangent, and the overload protection part is set Located on the drive gear shaft, the overload protection member includes a plurality of elastic cylinders. The driven ring gear is sleeved on the overload protector, and the inner wall of the driven ring gear close to the overload protector is provided with second transmission teeth distributed along its circumference, and a second arc-shaped groove is formed between the adjacent second drive teeth , the arcs of adjacent second arc-shaped grooves are tangent. The elastic cylinder is placed between the first arc-shaped groove and the second arc-shaped groove, and the elastic cylinder is coaxial with the central axes of the first arc-shaped groove and the second arc-shaped groove. The invention has a simple structure, can cut off the transmission of the torque when the load is overloaded, and solves the problems of the transmission stuck, the damage of the end rotating parts caused by the locked-rotor of the motor, and the burning of the motor.

The invention relates to a structural type, in particular to a multi-stage overload protection type shear pin type mechanical overload protection structure. The multi-stage overload protection type shear pin type mechanical overload protection structure can achieve protection in two stages, three stages, four stages and more than four stages. The multi-stage overload protection type shear pin type mechanical overload protection structure mainly comprises a driving wheel 1, a driven wheel 2, a displacement sensor, a control unit, shear pins in various stages and the like. The multi-stage overload protection type shear pin type mechanical overload protection structure is characterized in that the tooth form of the driving wheel is consistent with that of the driven wheel; the driving wheel is provided with a plurality of shaft pin installation holes; the driven wheel is provided with a plurality of shear pin installation holes and a plurality of shear pin installation sliding holes; when the overload phenomenon exits, the shear pins in various stages will be sheared in sequence, then displacement deviation is produced when the driving wheel continues to rotate and the driven wheel does not rotate, the displacement sensor is triggered, and finally the control unit can achieve the alarm, halt and other protection functions according to settings. The multi-stage overload protection type shear pin type mechanical overload protection structure is simple in structure, reliable to work, convenient to maintain and extremely low in cost, and thoroughly solves the technical problem that the multi-stage overload protection type shear pin type mechanical overload protection structure cannot be applicable to moving loads or unknown loads.

The invention relates to a saw arm mechanism for a belt transmission dual-blade cutting sawing machine. The saw arm mechanism comprises a transmission belt, an arm frame, a saw blade installing mechanism and dual spaced saw blades, wherein the arm frame comprises a substrate, a compression spring, a guide post, a main shaft installing block, a pressing bolt and an end cover; the saw blade installing mechanism comprises a compression spring, a pressure block, a locking bolt, a pressure bearing and a main shaft; each of the dual spaced saw blades consists of a saw blade substrate and a belt pulley disk. By adopting the saw arm mechanism, the belt transmission dual-blade cutting is realized, the size and weight of the sawing machine are reduced effectively, the service performance of the sawing machine is improved, the service life of the sawing machine is prolonged, the maintaining difficulty of the sawing machine is lowered, and the difficulty in changing the transmission ratio and the cost of a light-duty sawing machine are lowered effectively; moreover, a reliable mechanical overload self-stopping protection function is provided, so that the practicability and safety of the light-duty sawing machine are improved effectively from a plurality of aspects.

The invention relates to a mechanical transmission mechanism. A mechanical transmission mechanism that can preset an overload position, comprising a pair of meshed gears and an overload position setting spring, the gears are helical gears, and at least one gear in the pair of gears is slidable in the axial direction Sleeved on the transmission shaft and at least one end is supported by the overload position setting spring, when the pair of gears rotate, the gears slidably sleeved on the transmission shaft generate axial movement to drive the overload position setting spring Deformation energy storage, when the load driven by the mechanical transmission mechanism reaches the set upper limit, the position of the gear slidably sleeved on the transmission shaft is the overload position. The invention provides a mechanical transmission mechanism whose overload position can be preset, which solves the problem that the overload position of the existing mechanical transmission mechanism cannot be preset.

The invention provides a servo turret head overload protection device. The protection device comprises a drive side shaft sleeve (1), a steel ball (3), a blocking block (6), a bearing (2), a spring (4), a driven side shaft sleeve (11), a bolt (12), a clamping sleeve (10) and a moving shaft sleeve (9), wherein one side of the driven side shaft sleeve (11) is connected with the drive side shaft sleeve (1), and the other side of the driven side shaft sleeve (11) is connected with the clamping sleeve (10); the bearing (2) is located between the drive side shaft sleeve (1) and the driven side shaft sleeve (11); the moving shaft sleeve (9) is located outside the driven side shaft sleeve (11); the end face of the drive side shaft sleeve (1) is provided with grooves (1a), the driven side shaft sleeve (11) is provided with a first steel ball hole, and the steel ball (3) is arranged in the first steel ball hole. According to the servo turret head overload protection device, a mechanical overload protection mechanism is adopted, the fault clearing process is simplified while a knife rest is protected effectively, and the fault clearing and debugging cycle is shortened.