6573 results about "Impact" patented technology

The invention discloses a buffering, shock-proof and anti-collision conveying box for precision equipment, and relates to the technical field of conveying boxes, the buffering, shock-proof and anti-collision conveying box comprises a specially-made wooden box body, a plurality of groups of shock-absorbing blocks are arranged in the specially-made wooden box body, a plurality of groups of shock-absorbing and anti-collision mechanisms are arranged in the shock-absorbing blocks, and a plurality of groups of screw rods are arranged in the specially-made wooden box body. A lead screw is arranged in the special wooden box body, an oblique bevel gear is fixed to one end of the lead screw, a transmission rod is arranged in the special wooden box body, and a plurality of sets of movable supports are arranged in the special wooden box body and meshed with the lead screw. During continuous slight vibration, the contact area is reduced, friction is reduced, meanwhile, a lead screw drives a damping block to be attached to equipment to eliminate resonance, a damping anti-collision mechanism is triggered to work through violent impact, a spring and a damper absorb energy, when the impact exceeds the limit, the damper drives a gear mechanism to open an air valve, and an air bag expands to absorb impact force; the sliding block sleeve guides the expansion direction of the air bag to prevent damage, and the whole system can be dynamically adjusted according to actual impact strength to effectively cope with vibration and impact in transportation.

The invention discloses a tumble detection method, wearable equipment and a storage medium, relates to the technical field of tumble detection, and discloses a tumble detection method applied to the wearable equipment, the wearable equipment comprises an acceleration sensor and at least one other sensor except the acceleration sensor, the tumble detection method comprises the following steps: acquiring acceleration data acquired by an acceleration sensor based on a time sequence; if the acceleration data accord with the free falling acceleration performance in the first time period and accord with the impact rebound acceleration performance in the second time period, it is judged that a falling impact event is detected; in response to the falling impact event, obtaining a falling detection result determined based on detection data collected by other sensors; and if the tumble detection result is that the tumble event exists, triggering a tumble event response process. On the basis, when falling impact is detected, detection and identification are carried out based on other sensor parameters, so that the falling detection accuracy of impact caused by falling is improved.

The invention relates to the field of transmission towers, and discloses a tension type transmission tower buffer connecting device which comprises a supporting frame, a plurality of isolation assemblies are symmetrically arranged on the upper surface of the supporting frame, sliding seats are slidably connected into the isolation assemblies, and connecting rods are fixedly connected to the outer surfaces of the sliding seats. A belleville spring set is arranged between the outer surface of the sliding base and the inner wall of the isolation assembly, the belleville spring set is arranged on the outer surface of the connecting rod in a sleeving mode, and a telescopic rod and a first spring are fixedly connected between the outer surface of the sliding base and the inner wall of the isolation assembly. A primary buffer layer is formed by the belleville spring set and the first spring, axial impact force can be absorbed without sliding of the sliding seat during daily wind vibration and wire slight galloping, meanwhile, vibration can be restrained through the huge static friction torque of the fan-shaped friction face and the friction ball in the omnidirectional damping assembly, the circuit is kept stable, and slight load impact is effectively dealt with.

The invention provides a test device for simulating ejection impact load, which is characterized in that side columns of the test device are fixedly arranged, a movement guide rail is arranged on the inner wall of each side column along the vertical direction, a variable stiffness spring is arranged below each movement guide rail, and an electromagnet is arranged at a certain height between the two side columns. The load block is connected with the electromagnet under the magnetic force effect of the electromagnet, the two ends of the load block are slidably connected with the movement guide rails, the impact force sensor is arranged on the load block, the lower bottom face of the impact force sensor is flush with the lower end faces of the two ends of the support, and the model box is arranged below the load block and filled with soil. The surface of a soil body in the model box is flush with the upper end face of the variable-rigidity spring, each crank pulley mechanism is arranged on the corresponding side column and located above the variable-rigidity spring, and after the load block impacts the soil body for the first time and bounces, limiters in the crank pulley mechanisms move to the movement guide rails to prevent the load block from impacting the soil body again.

A power tool comprises a housing, a motor assembly and an impact assembly configured to be driven by the motor assembly. The impact assembly comprises a hammer defining a hammer chamber therein and an anvil at least partially disposed in the hammer chamber and configured to rotationally drive an output shaft. The anvil comprises a body portion, an anvil chamber defined therein, and a reciprocating member configured to selectively move radially outwardly relative to the body portion to be selectively impacted by an impact member of the hammer so that the hammer selectively imparts rotational movement to the anvil. The anvil includes an active valve configured to control discharge of fluid from an anvil chamber to the hammer chamber. The active value variably opens based on variance of one or more physical characteristics of the fluid (e.g., at least one of volume, temperature, pressure, or viscosity of the fluid).

The invention provides a steel box girder hoisting device for building construction, and relates to the technical field of building construction, slings are arranged at the tail parts of a main hook and an auxiliary hook, and during hoisting, under the action of the gravity of a hoisted steel box girder, the slings move from the tail parts of the main hook and the auxiliary hook to the middle parts to drive the auxiliary hook to rotate relative to the main hook; the middle part of the auxiliary hook is gradually close to the middle part of the main hook, namely the auxiliary hook is gradually changed from a state of being separated from the main hook to a state of being combined with the main hook. The auxiliary hook is limited by the damping mechanism in the rotating process, the speed of the lifting appliance moving from the tails of the main hook and the auxiliary hook to the middle is reduced, and the damping effect is achieved, that is, the damping mechanism absorbs impact stress generated between the auxiliary hook and the lifting appliance when the lifting appliance is subjected to instantaneous impact force at the moment of lifting load; and when the lifting appliance moves from the tail parts of the main hook and the auxiliary hook to the middle part, the auxiliary hook provides lateral support and limit for the lifting appliance, so that the unstable shaking of the lifting appliance is reduced, and the influence on the lifting stability and the construction safety of the steel box girder is reduced.

An impact tool includes a controller configured to control power being delivered to the and operable in one of: (a) a normal mode where the controller allows power to be delivered to the motor so that the impact mechanism transitions from operation in the rotary mode to operation in the impacting mode when an output torque exceeds a normal transition torque; and (b) a control mode where the controller controls power being delivered to the motor so that the impact mechanism transitions from operation in the rotary mode to operation in the impacting mode when an output torque exceeds a control transition torque that is greater than the normal transition torque.

The invention discloses a modularized replaceable self-resetting energy consumption type bridge pier anti-collision system, and belongs to the technical field of bridge engineering structure safety. The system includes an annular rubber pad, an annularly disposed damper module, and a shape memory alloy (SMA) tow. The damper module comprises a cylinder body, high-viscosity fluid, a reset spring, a piston and a force transmission plate. The cylinder body is fixed to the pier in a surrounding mode through bolts and rubber pads, the inner wall of the cylinder body is connected with the piston through a reset spring, the piston rod end is hinged to the force transmission plates, and the SMA wire bundles are connected with the force transmission plates. When an external impact load acts on the force transmission plate, the fluid damper provides viscous energy consumption, and the SMA wire bundle, the spring and the rubber pad provide deformation energy consumption; after the collision is finished, the system can be reset to the initial position under the synergistic effect of the SMA wire bundle, the spring and the rubber pad. By means of the modular design, efficient energy consumption and self-resetting can be achieved; and meanwhile, a single damper can be quickly replaced after being damaged, so that the maintenance efficiency and the system recoverability are greatly improved.

The application discloses a transfer box for precise positioning long rod, and relates to the technical field of transfer equipment, and aims to solve the technical problems that the existing loading and unloading box can fix the rod body, lacks reinforcement and protection for rod bodies with different length and width sizes, the rod body is easily damaged by bumping and impact during transportation, and the loading and unloading is complicated, and the intelligent degree of the mechanical arm is high, and the application comprises a box body mechanism and a protection mechanism, and the inner wall of the box body mechanism is connected with the protection mechanism. The application can complete the installation of the long rod through simple pushing and pulling steps, and after the installation is completed, the device can automatically adapt to the height of the long rod, so that the collision during transportation hardly affects the position of the long rod, the sliding of the long rod in the device is avoided, the protection effect of the device on the long rod is improved, meanwhile, the simple installation steps reduce the demand for the corresponding equipment when the device is used, and the operation difficulty and cost of the entire assembly system are reduced.

Provided are a planning and control method for a legged robot, an apparatus, a robot, and a storage medium. The method includes: determining, based on the movement state and the swing parameter of each leg at the next moment, a foot-end reference state of each leg, and planning, based on a foot-end dynamic model and a discrete collision model, an impact-aware swing leg trajectory for a leg that starts to swing at the next moment; and performing, based on the movement state, the reference state sequence, and the foot-end reference state, whole-body control on the legged robot, and performing, based on a whole-body dynamic model and the discrete collision model, impact-aware whole-body control for a leg that is a supporting leg in planning but does not touch the ground.

The utility model discloses a non-impact type electro-hydraulic control one-way valve which comprises a valve body, a control piston is arranged at the position, close to one side, in the valve body, a limiting rod is fixedly connected to the center of one side of the control piston, a rubber block is fixedly installed at one end of the limiting rod, and an ejector rod is fixedly connected to the center of the other side of the control piston. According to the non-impact type electro-hydraulic control one-way valve, through rubber blocks, a connector, a first spring, a movable block, a buffer block, a rubber ball, a second spring and a third spring, after a piston is controlled to complete actions and reset, the rubber block at one end of a limiting rod is tightly attached to the inner wall of the valve body, and impact generated when the piston is reset is further buffered through elasticity of rubber; in the moving process of the ejector rod, the buffer block stably moves towards the cone valve element, the rubber ball on the buffer block serves as a flexible part making contact with the cone valve element firstly, and the impact force and noise generated when the rubber ball makes contact with the cone valve element are effectively reduced.

The invention provides a tool applied to the field of petroleum drilling, and particularly relates to an underground non-circular gear intelligent impact tool which comprises a power module, an axial impact module and a circumferential impact module, the power module enables drilling fluid to impact a turbine in a directional mode through a drainage disc, hydraulic energy is converted into mechanical energy, and the mechanical energy is transmitted to the axial impact module. The power is transmitted to the axial impact module and the circumferential impact module, the axial impact module lifts a rack punch hammer to compress a spring through meshing of an incomplete gear and the rack punch hammer, and when the incomplete gear is disengaged from the rack punch hammer, the spring releases energy to generate axial impact downwards. The circumferential impact module is composed of two groups of incomplete gears and racks which are arranged in an up-down 90-degree staggered mode, the rack punch hammer compresses a spring through meshing of the incomplete gears and the rack punch hammer, and the spring is released to generate circumferential impact when the incomplete gears and the rack punch hammer are disengaged. Periodic impact can be achieved, the mechanical rock breaking efficiency is effectively improved, and the stick-slip phenomenon at the drill bit is reduced.

The invention relates to the technical field of robots, in particular to a redundancy-driven variable-stiffness ankle joint structure which comprises an ankle assembly connected to a shank main body through a central hinge shaft; the dual-drive unit comprises a first drive unit and a second drive unit which are independently controlled, and the first drive unit and the second drive unit are fixedly mounted in the shank main body; the traction system comprises a first eccentric wheel and a second eccentric wheel which are coaxially connected with the output ends of the first driving unit and the second driving unit respectively; by means of a redundant drive framework and a variable rigidity adjusting mechanism, elastic buffering and dynamic rigidity adjusting can be achieved, the impact adaptability is improved, the dual-drive unit can be prevented from being directly impacted, and the service life of the dual-drive unit is prolonged. Damage to a motor gear is reduced, the rigidity can be quickly reduced for buffering in an impact scene, and the rigidity is improved for maintaining the posture during stable supporting.

According to the impact-cutting composite rock breaking hydraulic system and method for the mining heading machine, hydraulic damping and impact hammer collaborative operation are integrated, and the problems that a traditional heading machine is low in rock breaking efficiency, poor in stability and insufficient in adaptability are solved. The system comprises a cutting arm hydraulic damping system and an impact hammer hydraulic impact system, and multi-parameter closed-loop regulation and control are achieved through a controller. The device is characterized in that a double overflow protection mechanism is adopted, a proportional overflow valve and an external control overflow valve cooperate with each other, a hydraulic control one-way valve is combined for compensating an oil path, and the pressure difference of a hydraulic cylinder is dynamically kept stable; the impact hammer system adjusts the pressure of an energy accumulator through a proportional pressure reducing valve and is matched with a hydraulic control switch valve to realize variable impact energy control; based on feedback of a vibration sensor and a pressure sensor, damping and impact parameters of the cutting arm are adjusted in a self-adaptive mode through a nonlinear algorithm, and intelligent rock breaking operation under different rock stratum hardness is achieved. According to the system, the impact resistance stability, the rock breaking efficiency and the operation intelligence level of the heading machine are remarkably improved.

The invention discloses a semitrailer frame and a loading and unloading method thereof, and relates to the technical field of semitrailers, the semitrailer frame comprises a longitudinal beam frame, a plurality of cross beams are fixedly welded in the longitudinal beam frame and on the front side and the rear side of the longitudinal beam frame, a traction pin mechanism is arranged at the bottom of the longitudinal beam frame, and a plurality of first connecting holes are formed in the tops of the longitudinal beam frame and the cross beams; the panel mechanism comprises a connecting panel and a bearing panel, a plurality of first mounting grooves are formed in the connecting panel, first bolts are arranged in the first mounting grooves in a penetrating and threaded mode, the first bolts are in threaded connection with the first connecting holes, and the bottom of the connecting panel is attached to the top of the longitudinal beam frame and the top of the cross beam. Inertial impact force generated by the full-load carriage during emergency braking can be effectively buffered, so that a connecting and fixing mechanism between the carriage and the bearing panel and a frame are effectively prevented from being damaged by large inertial impact force, goods can be effectively prevented from being damaged by the large inertial impact force, and the transportation loss of the goods is reduced.

The invention provides a high-speed submerging jet flow and mechanical shock synergistic ice damage test method. The method comprises the following test steps: S1, arranging a data acquisition system; s2, initializing working conditions; s3, preparing an ice body sample; s4, prefabricating ice body damage by high-pressure water jet; s5, a servo electric cylinder drives a mechanical structure to impact ice damage; s6, data acquisition; and S7, data processing. According to the invention, the force sensor, the laser displacement sensor and the high-speed camera synchronously collect the load, deformation and image information of ice damage caused by impact of a mechanical structure by means of the servo electric cylinder under the jet-assisted effect, so that accurate control and synchronous measurement of submerged jet and mechanical cooperative damage are realized; the impact of different mechanical structures at different speeds on the ice damage load is avoided.

The utility model belongs to the technical field of automatic transportation equipment, and particularly relates to an elbow arm type heavy load driving wheel device which comprises a disc bearing, a mounting base plate, a fixed arm, an elbow arm, a hinge shaft A, a hinge shaft B, a hinge shaft C, a hydraulic cylinder, a steering motor, a transmission gear, a driving wheel mounting frame and a driving wheel. According to the elbow arm type heavy load driving wheel device, the functions of bearing, lifting, driving and steering can be integrated in the same module, so that the dependence of the interior of a vehicle body on an extra steering mechanism and an extra lifting mechanism is reduced, and the compactness and the space utilization rate of the whole vehicle structure are improved. By adopting the elbow arm type lifting structure, the wheel set forms an arc-shaped motion trail in the lifting process, and compared with a traditional linear guide rail type lifting mode, loads and impact force can be more effectively dispersed, the local stress concentration phenomenon is reduced, and the occurrence probability of the problems of guide rail abrasion, clamping stagnation and the like is reduced; and the long-term stability and reliability of the structure under the heavy load working condition are improved.

The invention relates to a dynamic characteristic modeling method and system for an alternating impact disassembling operation robot, and relates to the technical field of robot control, and the method comprises the steps: firstly, comprehensively considering the dynamic characteristics of a robot joint side and a motor side, building a torque-driven flexible joint dynamic model, and determining the influence of joint flexibility on impact response; secondly, estimating normal impact force and tangential friction force by adopting an exponential inelastic continuous contact model, constructing an alternating impact dynamic model, and quantifying momentum change and a nonlinear dynamic effect in the impact process; and finally, a multi-space dynamic characteristic coupling model is established, the interaction mechanism of the joint space, the impact contact space and the task space is systematically analyzed, the accurate speed after impact is output, an impact force control strategy is generated, the dynamic response precision of the robot under the alternating impact operation is improved, the active utilization of the robot on the impact effect is achieved, and the reliability of the robot is improved. And the stability, the accuracy and the high efficiency of the disassembling operation are ensured.

A power tool includes a housing, a motor, an output spindle, a rotary impact assembly configured to transmit rotational motion with intermittent rotational impacts from a cam shaft to the output spindle, and a transmission.

The invention discloses a filling and transporting device for gold mine mining, which relates to the technical field of transporting devices and comprises a rack, conveying rollers are arranged on two sides of the rack, a conveying belt is arranged on the outer sides of the conveying rollers in a transmission manner, a row of cleaning rollers are arranged on the rack and positioned below the conveying belt, and a control component is arranged on the inner side of the conveying belt. According to the filling and conveying device for gold mine mining, impact force generated by falling of gold mine mining fillers is buffered through the first damping springs, the impact force generated by falling of the gold mine mining fillers can be effectively prevented from directly acting on the conveying belt, and therefore damage such as abrasion and deformation of the conveying belt caused by impact is reduced, and the service life of the conveying belt is prolonged; the equipment maintenance and replacement cost is reduced; buffering can absorb and disperse impact force, the influence of the impact force on the whole conveying system is reduced, the conveying belt is more stable in the operation process, and equipment vibration and shaking caused by the impact force are reduced.

The invention discloses an ice region ship shock absorber matching optimization method based on NSGA-III, which comprises the following steps: establishing a motor-silicone oil shock absorber-shafting-propeller coupling system kinetic model, calculating transient torsional vibration response under ice load impact by adopting a Newmark-beta method, and constructing a multi-target optimization model by taking the outer diameter, thickness, side clearance and top clearance of a shock absorber as design variables; an initial population is generated in combination with Latin hypercube sampling, and an optimal parameter combination is obtained after iterative optimization is conducted through an NSGA-III algorithm; experimental data show that the torsional vibration stresses of the motor shaft, the 1 # intermediate shaft, the 2 # intermediate shaft and the propeller shaft of the optimized shock absorber at the rated rotating speed are respectively reduced by 18.0%, 11.1%, 11.8% and 17.7%, and the effectiveness of the method is verified.

A subframe mount of a front subframe comprising a vehicle frame. The subframe mount comprises a main body configured to receive a securing feature of a frame body of the vehicle frame. The subframe mount also comprises an open-ended slot configured to enable translation of the securing feature independent of the subframe mount in response to an impact event.

The invention relates to a composite percussion drilling speed increasing tool, and belongs to the technical field of drilling tools. The reciprocating hammering unit comprises a hammer body and an impact hammer, the hammer body is axially and slidably connected into the sleeve, the impact hammer is rotatably connected into the hammer body, a reversing sleeve is rotatably connected into the impact hammer, a reversing cabin is arranged on the reversing sleeve, and a reversing runner hole is formed in the hammer body; the flow channel switch unit comprises a baffle ring arranged on the surface of the hammer body and a transmission mechanism connected between the sleeve and the baffle ring, and the transmission mechanism is used for converting axial motion of the baffle ring into rotary motion so as to open or close the reversing flow channel hole. When the drilling tool is lifted, the axial movement of the baffle ring can be converted into rotary movement, so that the baffle ring rotates relative to the hammer body while axially displacing along with the hammer body, a reversing flow channel hole is shielded, and high-pressure drilling fluid cannot flow into a reversing cabin, so that high-frequency composite impact is stopped, vibration and abrasion caused by idling are avoided, and the service life of the drilling tool is prolonged. And the service life and the safety of the tool are improved.

The invention discloses an impact resistance test device and method for an energy-absorbing anti-collision structural member, and relates to the technical field of automobile anti-collision members. Comprising a support, a drop hammer mechanism arranged on the support and capable of sliding in the Z direction, a clamp arranged at the bottom of the support and used for clamping a test piece, and a force value sensor arranged below the clamp and used for collecting impact force borne by the test piece. The first displacement detection component is arranged above the test piece and can be used for measuring the concave depth of the upper surface of the test piece, the second displacement detection component is arranged between the test piece and the force value sensor and is used for measuring the convex height of the lower surface of the test piece, and the first displacement detection component can move in the X direction and the Y direction. The first displacement detection component can measure the concave depth of the upper surface of the sample in a multi-point mode, the second displacement detection component can measure the protruding height of the lower surface of the sample, it is ensured that the initial error can be accurately deducted from the displacement variation after impact, and the measurement precision of the upper and lower surface deformation of the sample is improved.

The invention discloses measuring equipment for a tunnel construction site, and relates to the field of construction measuring equipment, the measuring equipment comprises a measuring vehicle, a driving arm is rotatably mounted on the measuring vehicle, and two measuring instruments are movably mounted on the driving arm; the device also comprises an impact rebound protection device, and the impact rebound protection device is disposed on the measuring vehicle. It needs to be explained that falling rocks can be effectively bounced off through the arrangement of the side impact plates and the front impact plate; if the falling rockfall is too large, the measuring instrument can be stored in the measuring vehicle to be protected, the rotary storage shaft drives the synchronous supporting rotating frame to rotate, the measuring vehicle is lifted, the rockfall slides away, safety of equipment on the measuring vehicle is further guaranteed, the synchronous supporting rotating frame can be pushed to move, and then the supporting area of the measuring vehicle is enlarged; in addition, when falling rocks fall on the front impact plate, the active cleaning strip moves transversely to pull away the falling rocks on the front side of the measuring vehicle, and cleanliness of the advancing path of the measuring vehicle is guaranteed.

The invention discloses an electromagnetic ejection type impact testing machine device and a testing method, and belongs to the technical field of impact testing. The problem that when an existing impact testing machine needs a high impact speed, the device also needs a large acceleration distance is solved. The first electromagnetic main track and the second electromagnetic main track are fixedly connected to the track support in the length direction, the two electromagnetic auxiliary tracks are fixedly connected to the portions, on the two sides of the first electromagnetic main track, of the track support respectively, and the two electromagnetic auxiliary tracks, the first electromagnetic main track and the second electromagnetic main track each comprise two parallel linear tracks. The linear track is formed by arranging a plurality of stators in the length direction, and each stator is wound with an electromagnetic coil. According to the invention, through the electromagnetic track acceleration device, a large impact speed can be obtained in a small acceleration distance, the automation degree of an impact test is improved to a great extent, and flexible adjustment and accurate control of impact gears are realized.

The invention relates to the technical field of vehicle dynamic performance testing, and particularly discloses a method and a system for testing vehicle tracking recovery capability based on transverse impact. The method comprises the following steps: acquiring position information of a tested vehicle in real time in a tracking driving process of the tested vehicle on a test road; if the tested vehicle arrives at the impact triggering area, controlling a road simulation plate laid on the test road to move transversely so as to simulate an impact working condition; when a tested vehicle arrives at an impact triggering area, rear wheels of the tested vehicle are located on the road simulation board. In the transverse movement process of the road simulation board, the instantaneous yaw angle of the tested vehicle is obtained; and responding to the situation that the instantaneous yaw angle is larger than a first set threshold value for the first time, and testing the tracking recovery capability of the vehicle according to the driving performance of the tested vehicle under the control of the electronic stability system. According to the method, the technical bottlenecks of uncontrollable interference and non-quantitative data of a traditional control test are overcome, and repeatable test, controllable parameters and quantitative evaluation are realized.

The invention relates to the technical field of bearings, and provides an anti-impact hydrostatic bearing air supply system which comprises a first air supply subsystem and a second air supply subsystem, the first air supply subsystem comprises a first pipeline, a first check valve and a reaction mechanism, the reaction mechanism is connected with the first pipeline, and the first check valve is arranged on the first pipeline; the second gas supply subsystem is connected with the first pipeline and is used for being connected with the hydrostatic bearing; the reaction mechanism can generate chemical reaction when the hydrostatic bearing bears strong external impact, and water vapor is generated and enters the hydrostatic bearing. According to the anti-impact air supply system for the hydrostatic bearing, when the hydrostatic bearing bears severe impact, chemical reaction occurs in the reaction mechanism, a large amount of high-temperature and high-pressure water vapor is generated, the water vapor pushes the first check valve to be opened so as to enter the hydrostatic bearing, the bearing capacity of the hydrostatic bearing is improved, and collision between the rotor and the hydrostatic bearing is avoided.

The invention relates to the technical field of lifting equipment, and discloses a chassis lifting mechanism which comprises a gear motor, a fixed frame, a lifting frame, a lifting assembly and a self-lubricating assembly, the gear motor is installed on the lifting frame, and the fixed frame is slidably connected to the lifting frame; the lifting assembly comprises a transmission part, and the transmission part is connected with an output shaft of the gear motor. According to the chassis lifting mechanism, through the arranged synchronous transmission lead screws on the two sides, synchronous transmission can be conducted through the two lead screws, stable lifting is achieved, meanwhile, pressure division can be conducted on a bearing piece, and the problems that blocking is generated due to transmission of a single lead screw and stability is poor due to bearing lifting of the single lead screw are solved; and the motor of the lifting mechanism is not influenced by impact force and overturning force, so that the overall impact resistance is improved.

The utility model relates to the field of percussion drills, and particularly provides a percussion drill convenient to switch modes. The percussion drill comprises a percussion drill body, a driven assembly and a telescopic assembly, the telescopic assembly comprises a telescopic column, the left end of the telescopic column is fixedly connected to the output end of the right side of the percussion drill body, the right end of the telescopic column is sleeved with a drill bit, and a driven disc is located on the right side of the drill bit. The technical problems that a flat-head drill bit or a cross-shaped drill bit of an existing percussion drill needs to be disassembled, assembled and replaced, drilling work is often high in repeatability, frequent disassembly, assembly and replacement of the drill bit are troublesome, efficiency is affected, the connecting position of a transmission structure of the percussion drill and the drill bit is prone to being abraded, and convenience is not achieved are solved. And abrasion of the joint of the output end of the percussion drill body caused by repeated disassembly is avoided, and the percussion drill is simple and stable in overall structure, convenient to use and good in practicability.