129 results about "Impact area" patented technology

The invention discloses a laminated plate impact event three-dimensional strain field inversion method based on binocular vision, and the method comprises the steps: laying dynamic tracking mark points on the surface of an impacted carbon fiber laminated plate, synchronously collecting the image data of the whole impact process through a high-speed binocular camera, and generating a binocular vision image sequence with impact time sequence information; generating three-dimensional displacement field data of the impact area of the carbon fiber laminated plate based on the binocular vision image sequence; calling the anisotropic constitutive model of the carbon fiber laminated plate to generate a preliminary three-dimensional strain field inversion result; and performing coupling operation on the preliminary three-dimensional strain field inversion result, the impact load parameter and the laminated plate material characteristic parameter to generate a final carbon fiber laminated plate three-dimensional strain field inversion result consistent with the dynamic response of the impact event. According to the embodiment of the invention, accurate full-field representation of the dynamic strain of the impact event can be realized, and reliable data support is provided for impact resistance evaluation and structure optimization of the laminated plate.

The invention discloses a quantitative analysis method for an artificial rain and snow enhancement effect based on fine calculation of an influence zone, which comprises the following steps: acquiring the influence zone in an artificial spreading catalyst diffusion zone according to artificial ice crystal concentration or silver iodide concentration; carrying out extraction and qualitative analysis on the radar products in the influence area; performing space-time matching on the influence area and the radar product, and calculating a mean value and distribution of radar parameters in the influence area; performing spatial distribution and time sequence change analysis on the radar parameters, and calculating parameter change and change rate of the radar product in the influence area; and quantitatively analyzing the parameter change and the change rate, and giving a rainfall enhancement operation effect. The method not only can improve the precision of quantitative analysis of the artificial rain and snow enhancement effect based on fine calculation of the influence area, but also has good interpretability, and can be directly applied to a quantitative analysis system of the artificial rain and snow enhancement effect.

The invention relates to the technical field of cleaning equipment, in particular to an underwater cavitation jet observation experiment device and method based on a triangular reflector, and the device comprises a jet control device, an impact observation device, a plurality of light source assemblies and a high-speed camera. The spraying control device comprises a nozzle, and external high-pressure water flow is sprayed out downwards from the nozzle after passing through the pump pipe; the impact observation device comprises a clamping device. The clamping device comprises a triangular prism reflector and a support used for placing the triangular prism reflector. A shot picture of the high-speed camera can simultaneously comprise a free jet flow area and a jet flow impact area reflected by the triangular prism reflector. According to the double-angle free cavitation jet flow observation device, the three-edged reflector is utilized, cavitation flow evolution of a free jet flow area of cavitation jet flow and a jet flow impact area reflected by the three-edged reflector can be observed at the same time, and double-angle free cavitation jet flow observation is achieved.

The invention relates to the technical field of meteorology, in particular to a dangerous weather intelligent early warning system based on data analysis, which comprises a multi-source weather data acquisition module for acquiring dangerous weather data such as meteorology, geology and hydrology; the multi-source weather data transmission module transmits data to the cloud through a communication interruption coping mechanism and sets access authority; the multi-source weather data processing module is used for cleaning and proofreading the data and extracting key weather characteristics; the avalanche judgment model building module is used for building an avalanche judgment model based on an avalanche occurrence probability and a confidence interval by using GAN enhanced feature data; the early warning generation module simulates an avalanche path and an influence area through an avalanche physics model and a shallow water model, evaluates a danger level and issues an early warning; and the model updating module dynamically optimizes the avalanche judgment model based on the latest data, so that the accuracy and timeliness of the early warning capability are improved.

The invention provides a shield tunnel adjacent pile group influence zoning method based on engineering measures, which comprises the following steps: constructing a stress analysis model of soil disturbance caused by shield construction and pile group stress characteristics, and determining an interaction relationship among soil, piles and a tunnel; according to the interaction among soil, piles and tunnels, the interference degree of shield construction on the group piles is determined; according to the interference degree of shield construction on the pile group, a plurality of influence areas of the shield adjacent to the pile group are divided, the risk level of each influence area is determined, and the risk levels comprise the high risk level, the medium risk level and the low risk level; and aiming at the risk level of each influence area, determining engineering protection measures according to the risk level of the influence area so as to ensure construction and structure safety. At least the disturbance degree of shield construction on the pile group can be accurately predicted, and engineering protection measures are determined according to the risk levels of the multiple influence areas, so that construction and structure safety is ensured, and engineering risks and economic losses are reduced.

The invention belongs to the technical field of safety monitoring, and particularly discloses and provides a building construction safety monitoring system which comprises a dynamic influence area delimiting module, a multi-source dangerous area identification module, a personnel safety analysis module and an evacuation path generation module. According to the invention, through multi-dimensional risk association analysis of the equipment motion trail, the structural deformation data and the environmental parameters, a real-time multi-source danger area including the equipment danger area and the structural danger area is generated, the multi-source danger area is accurately identified, and the environmental parameters of the position of the air operation equipment are subjected to weighted analysis, so that the safety of the air operation equipment is improved. According to the method, the multi-source dangerous area of the air operation equipment can be accurately identified, the timeliness and effectiveness of danger early warning can be enhanced, and accurate safety early warning can be carried out by comparing the position of the constructor and the overlapping area of the multi-source dangerous area in real time. And the shortest evacuation path for avoiding the dangerous area and the obstacle is dynamically generated by using a path optimization algorithm based on the real scene image.

The invention provides a laser cladding wear-resistant bionic structure coating and a preparation method, the laser cladding wear-resistant bionic structure coating comprises a first layer, a second layer, a third layer, a fourth layer, a fifth layer and a sixth layer which are sequentially connected together from bottom to top, the first layer is made of soft materials, the second layer and the third layer are made of hard materials, the fourth layer and the fifth layer are made of composite materials, and the sixth layer is made of composite materials. The composite material comprises a soft material and a hard material, in the horizontal direction, the hard material and the soft material in the composite material are sequentially arranged in a crossed mode, and the sixth layer is a wear-resistant material; the first layer, the second layer and the third layer form a periodic area and are used for buffering and absorbing energy, the fourth layer and the fifth layer form an impact area and are used for enhancing the toughness of the coating, and the sixth layer is an impact surface and is used for improving wear resistance and bearing impact; by means of the design, the periodic area, the impact area and the impact surface are matched with one another, a complete protection system is formed, the characteristics of different materials are fully played, and balance between the rigidity and the toughness of the coating is achieved.

The application discloses a tundish dam structure with a flow guide pipe, which comprises a straight wall, a flow guide hole, a side wall, a dam and a flow guide pipe. The straight wall, the side wall and the dam are an integrated structure, and the integrated structure is embedded in the inner wall of the tundish at both ends. The straight wall in the inner cavity of the dam is provided with a plurality of flow guide holes, and the flow guide pipe is embedded on the flow guide hole. The application effectively promotes the removal of inclusions in the impact area and the casting area of the tundish.

The present invention belongs to the field of laser processing technology, and in particular relates to a method for judging laser shock-induced spalling damage. A local characteristic sample is processed by using the material properties and geometric characteristics of a real part; the characteristic sample is impacted by using a proposed laser parameter; the depth of the impact pit is measured; a characteristic sample model is established; the finite element analysis parameters are solved according to the proposed laser parameters; the solved finite element analysis parameters are numerically simulated and calculated to extract the pit depth of the impact area; the two pit depths are compared to obtain a relative error; the laser shock parameters are adjusted according to the comparison result, and the above steps are repeated until the error between the two does not exceed the error threshold; the maximum strain is extracted from the numerical simulation visualization cloud map result that meets the relative error requirement; the maximum strain obtained by the finite element simulation is compared with the critical strain of material damage, and then it is determined whether the proposed parameters will cause spalling damage, thereby effectively improving the application reliability of the laser shock strengthening process on thin-walled parts.

This invention discloses an active hood pop-up system, control method, and vehicle, including an engine hood, an active pop-up device, a visual sensing device, an analysis and processing device, and a control device. The active pop-up device includes multiple active pop-up mechanisms evenly distributed on the underside of the engine hood, configured to partially pop up the engine hood. The visual sensing device is configured to visually detect vehicle driving information during vehicle operation, including pedestrian and vehicle information. The analysis and processing device is configured to analyze and process the driving information to determine the impact area between the pedestrian and the engine hood. The control device is configured to activate the active pop-up mechanism corresponding to the impact area before impact. This invention pre-adjusts the active pop-up mechanism when a pedestrian-vehicle collision occurs and activates the corresponding active pop-up mechanism according to different impact areas, achieving active and intelligent protection for pedestrians.

The application discloses a kind of extracorporeal shock wave treatment handle and therapeutic instrument, belong to biological medical equipment technical field, including pipe body, control handle and impact component, pipe body is equipped with air pipe;Control handle is equipped with gas control valve, air pipe is equipped with bullet body;Impact component includes cover, impact body and elastomer, impact body is set in cover and has multiple impact heads.The impact component of the application is designed with multiple impact heads, the impact head is designed with nested type, the position of each impact head can be adjusted by adjusting mechanism, by changing the number of impact heads in working condition, the size and form of impact area can be adjusted, without the need to disassemble the original impact head and install new impact head as in the traditional biological medical engineering industry, to change the impact area and form, thereby greatly improving the convenience and versatility of equipment use.

The application discloses a kind of electrical equipment performance comprehensive test device, including comprehensive test box and walking base, the top of the walking base is fixedly connected with support, the top of the support is rotatably connected with suspension frame, and the rotating axis of the suspension frame and comprehensive test box is horizontal.The application is provided with support, suspension frame, top protection trigger frame and side protection trigger frame, wherein the comprehensive test box is hung at the free end of the suspension frame, the top of the support is rotatably connected with the suspension frame, the side protection trigger frame is arranged on the two sides of the comprehensive test box, and the top protection trigger frame is arranged on the top, then the clutch control group and the winding buffer are arranged on the support, when the left and right sides or the top of the comprehensive test box is impacted, the suspension frame will swing down to drive the comprehensive test box to buffer subsidence, away from the impact area, the setting has impact displacement self-protection function, which greatly improves the self-protection performance of the comprehensive test box.

The present application relates to the technical field of downhole management, and particularly discloses a coal mine downhole anti-collision personnel management system, which is used to solve the problem of weak prevention ability of personnel management in coal mine downhole accidents; the present application sets the positioning base station installed at the entrance of the impact area as the first positioning base station, the positioning base station installed at the end of the impact area as the second positioning base station, and the positioning base station installed at the exit of the impact area as the third positioning base station by acquiring the positioning information of the personnel, sets the distance path between the first positioning base station and the second positioning base station as the first path, sets the direction of the first positioning base station towards the second positioning base station in the first path as the first positive direction, and sets the direction of the second positioning base station towards the first positioning base station in the first path as the first negative direction, compares the positioning information of adjacent time points to determine the movement direction of the personnel in the first path, realizes dynamic monitoring, and ensures instant grasp of the personnel flow direction and state.

The present disclosure relates to a method for transmitting traffic instructions in a mine comprising: receiving (SI) data indicative of at least one event within the mine (1) from at least one sensing unit (11) within the mine, the data comprising timing information data, position information data and observation information data, determining (S4) an impacted area (3) on a model of the mine based on the timing information data, position information data and the observation information data, determining (S5) at least one traffic rule based on the impacted area (3), transmitting (S7) at least one traffic instruction based on the at least on traffic rule to at least one receiving unit (2).

The present invention discloses a laser-induced shock wave high-precision forming method, which belongs to the field of laser shock forming technology. The method comprises the following steps: (1) determining the material, size, and structural dimensions of a part after forming; (2) drawing a three-dimensional model of the part, determining a laser shock forming processing scheme, and adjusting process parameters to ensure that the structural dimensions after forming meet the requirements; (3) using trajectory planning software to determine the processing trajectory of the first processing area, and impacting the first impact area according to the determined processing scheme and processing trajectory; (4) scanning the part after the impact of the first area, calculating the structural dimensions, and redrawing the three-dimensional model of the part; (5) determining the processing trajectory of the second impact area according to the newly drawn three-dimensional model of the part, and impacting the second impact area according to the determined processing scheme and processing path; and repeating the above process until all areas are processed. The method enables the laser to be accurately irradiated to the specified position, thereby improving the accuracy of laser shock forming.

The invention relates to a flow field visualization measurement system and a measurement method for impact entry of a landslide block into water. The flow field visualization measurement system comprises a water tank, a slope arranged in the water tank, a landslide block body arranged on the slope, and PIV equipment used for observing the distribution of an inflow flow field impacted by the landslide block body. The water tank is filled with experimental fluid; the landslide block body is formed by stacking transparent solid particles with the same refractive index as the experimental fluid; the PIV equipment comprises a laser light source and a camera; wherein the laser light source illuminates an impact water-entering area of the landslide block rushing into the experimental fluid, and the camera directly faces the impact water-entering area and is used for acquiring an image. Compared with the prior art, the flow field distribution in the collapse block and the flow field distribution under the action of the block body and water flow when the landslide block body impacts into water can be accurately observed, so that more accurate data support is provided for understanding and predicting the flow field dynamic state when the landslide block body impacts into water.

The present invention proposes a simulation method for simulating shot peening strengthening of a structural member with an inclined projectile impact. The number of projectiles at saturation shot peening is calculated based on the crater diameter obtained from the finite element simulation of a single projectile impact and the saturation shot peening coverage rate; a calculation method for residual stress at different projectile incident angles and projectile incident velocities is established, and the residual stress along the depth direction of the projectile impact area when the projectile is obliquely incident is calculated based on the residual stress along the depth direction of the projectile impact area when the projectile is vertically incident; a calculation method for residual stress in the area of multiple projectile impacts is established, and the residual stress along the depth direction of the projectile impact area during multiple projectile impacts is calculated based on the residual stress along the depth direction of the projectile impact area at different projectile incident velocities and projectile incident angles; the residual stress under different shot peening conditions is introduced into the structural member model in the form of initial stress, and thus the finite element simulation of the shot peening strengthening deformation of the structural member with an inclined projectile impact is carried out.

The application belongs to the technical field of sensors and particularly relates to a water jet impact sensor and a use method thereof. An LED lamp indication area is arranged on a target plate surface, a pressure sensing unit with a fence type grid node is adopted, cylindrical weights with different masses and different round bottom areas are used to drop and impact the target plate from different heights, the water jet impact target plate is simulated under different pressures, the node pressure information, the node response coordinates and the drop height data of the drop from different heights are used as training data input values, the impact pressure is theoretically calculated, the theoretical calculation impact area is used as an output value, a multi-objective fast non-dominant sorting genetic algorithm model is trained, a database is established for predicting the jet area and the effective jet pressure mean value generated by the impact, prediction values are provided for water jet impact tests at different distances, wavelet threshold processing data in a real test process is checked, and the impact area and the impact pressure mean value in different areas are given.

The invention relates to the technical field of communication equipment, in particular to a communication base station which comprises a baseband processing unit, a radio frequency processing unit and an antenna feeder system which are installed on a stand column, the antenna feeder system is movably installed on the side portion of the stand column through a stretching component, and a movable frame of a stretching component body is installed on the side portion of the stand column in a sliding mode; the working angle and position of the antenna feeder system are adjusted by controlling the extension amplitude of the antenna feeder system on the side part of the stand column, so that the capability of resisting severe weather of the antenna equipment is improved; under the condition of hail weather, the antenna feeder system is erected, and the hail impact area is reduced; under the condition of storm weather, the antenna feeder system is folded towards the position close to the stand column, the extending distance of the antenna feeder system is shortened, the pressure borne by the connecting component is reduced, and the connecting component is prevented from being broken and damaged.

The invention discloses a dynamic evaluation system for impact toughness of a T-shaped elevator guide rail, and belongs to the technical field of elevator safety detection. The core of the system comprises an impact simulation device, a multi-dimensional sensing array and a dynamic analysis module. The impact simulation device drives a profiling electromagnetic impact head through an angle-adjustable impact arm to apply a controllable dynamic impact load to a web and / or a flange of the guide rail; the multi-dimensional sensing array is composed of a strain sensor cross grid array, a flange end acceleration sensor set and a laser displacement sensor which are arranged in an impact area, and dynamic strain field distribution, a vibration acceleration spectrum and three-dimensional deformation displacement data are synchronously collected. According to the method, three technical problems of separation of static testing and dynamic working conditions, single-point monitoring of hidden damage omission and damage evaluation and service life prediction splitting are solved, and multi-dimensional quantitative evaluation and preventive maintenance decision support of the impact toughness of the elevator guide rail are realized.

The invention discloses an artificial precipitation enhancement effect test method based on empowerment processing and natural filtering, and relates to the technical field of artificial influence weather, and the method comprises the following steps: determining an influence area of artificial precipitation enhancement operation, and selecting a comparison area; respectively carrying out dimension normalization on the test parameters of the influence area and the comparison area; calculating a weight coefficient of the corresponding test parameter according to the change rate difference quantity of the normalized test parameters of the influence area and the comparison area; sequentially selecting a set number of test parameters as test indexes according to the weight coefficients from large to small; calculating a variation difference coefficient of the test indexes of the influence area and the comparison area, and further calculating the correlation degree of the test indexes; and based on the weight coefficient, the correlation degree and the change rate difference quantity of the test index, the artificial precipitation enhancement effect is tested. According to the method, a more objective, accurate and comprehensive artificial precipitation effect test result is obtained, a new method basis is provided for artificial precipitation effect test, and the development of an artificial influence weather operation technology can be promoted.

The present invention relates to the field of structural health monitoring technology, and in particular to a method and system for impact positioning and energy detection based on a convolutional neural network. The method adopts a convolutional neural network model to roughly locate the impact area, and based on this, accurately locates the specific impact position within the impact area through a centroid weighted algorithm based on DTW; at the same time, the energy of the impact response signal is used to characterize the magnitude of the impact energy. This method has accurate positioning, high impact inversion efficiency, and simple operation. It not only avoids the influence of structural complexity on positioning accuracy, but also effectively controls the impact energy estimation error. While reducing maintenance costs, it also effectively improves the efficiency of positioning and detection.

The impact-resistant composite masonry structure for the impact area of the tundish comprises a second impact plate, a first impact plate is installed on the surface of the second impact plate, a permanent layer is fixedly arranged on the periphery of the second impact plate, and a permanent layer is fixedly arranged on the periphery of the bottom of the first impact plate. And the middle part and the top part of the first impact plate are fixedly provided with a ladle wall dry material layer. The bottom area of the second impact plate is larger than that of the first impact plate. And the sections of the first impact plate and the second impact plate are trapezoidal structures. The impact-resistant plate has the advantages of being reasonable in structural design, ingenious in conception, convenient and fast to machine and manufacture, high in strength, capable of effectively preventing the impact-resistant plate from moving upwards and permeating steel, capable of enhancing the strength of an impact area of the tundish, safe and stable.

The utility model discloses a buoyancy self-balancing type multi-air-chamber inflatable seat, which belongs to the technical field of inflatable seats, and comprises an inflatable cushion, one side of the inflatable cushion is provided with an inflatable tube, the bottom end of the inflatable cushion is provided with a buffer structure, the buffer structure comprises an air cushion, the top end of a groove rod is provided with a plurality of rectangular grooves, and the rectangular grooves are communicated with the inflatable tube. Two air cylinders are arranged on the outer surface of the air cushion, two air outlet holes are formed in the bottom end of the sliding rod, and arc-shaped pieces are fixedly connected to the two ends of the sliding rod correspondingly. By arranging the buffering structure, arranging the air cushion at the bottom end of the inflatable cushion and dividing the interior of the air cushion into two areas through a groove rod, when one side of the air cushion is subjected to water surface impact force, the air cushion is not prone to falling off; according to the inflatable seat cushion, the sliding rod is pushed by air to move to bring the air outlet hole into the area on the other side, so that the air in the area on the side, which is impacted, of the air cushion can be quickly transferred to the other side, the balance of the inflatable seat cushion is kept as far as possible, the inflatable seat cushion is prevented from turning on one side, and the use stability of the inflatable seat cushion is improved.

In order to solve the problems that in the prior art, calculation precision and efficiency are difficult to consider at the same time during supersonic jet machining, and detached shock waves cannot be accurately captured, the invention provides a finite element simulation method for the stagnation flexible constraint flow field characteristics of a jet impact area. The finite element simulation method comprises the steps that firstly, a geometric model of a jet area and an outer watershed is established, and preliminary solving is conducted; extracting jet flow axis pressure gradient characteristics to determine detached shock wave interval coordinates; then reconstructing a block geometric model comprising an upper jet flow region, a detached shock wave region, a stagnation region and an outer watershed according to the coordinates, and implementing differential local grid encryption on the shock wave region and the stagnation region; and finally, carrying out second iterative solution based on the Sutherland viscosity law to obtain final flow field distribution. According to the method, the thickness and the position of the shock wave layer are accurately captured while the number of the grids is controlled through the block encryption strategy, the contradiction between the calculation economy and the numerical precision under the transonic flow condition is solved, and the method is suitable for numerical simulation of the complex supersonic gas jet flow field containing the detached shock wave and the stagnation region.

The invention belongs to the field of wear-resistant elbow casting, and particularly relates to a lost foam casting method for a wear-resistant elbow. Comprising the steps that S11, target working condition parameters are obtained; step S12, based on the obtained target working condition parameters, calculating the thickness of an impact area of the wear-resistant elbow; s13, based on the impact thickness of the wear-resistant bent pipe, the impact area position of the wear-resistant bent pipe is calculated; and S14, the needed wear-resisting elbow pipe casting is manufactured based on the impact area position and the impact area thickness of the wear-resisting elbow pipe. In this way, the accurate position of the impact area and the thickness needed by the wear-resistant elbow are scientifically determined, and therefore materials and cost are saved.

The utility model discloses a port and wharf protective fence, and relates to the technical field of protective fences, the port and wharf protective fence comprises a main body and an adjusting mechanism, the inner side of the main body is provided with the adjusting mechanism, through the adjusting mechanism, when the device is impacted by sea waves on the seaside, the structure for reducing the impacted surface during the sea wave impact is adjusted, the impact force is reduced, and the service life is prolonged; the T-shaped pull rod is pulled to be separated from supporting of the L-shaped brackets and move upwards, the toothed rod moves along with the T-shaped pull rod, the meshed transmission gear is driven to rotate, the rotating shaft rotates, the rhombic baffle is driven to rotate, the inclination angle is changed, full sealing is changed into a grid shape, the impact area of water flow is reduced, the service life is prolonged, and after the T-shaped pull rod moves to the outer side of the other L-shaped bracket, external force is canceled. The tension spring drives the T-shaped pull rod to slide towards the inner side of the constraint box, so that the T-shaped pull rod abuts against the inner side of the L-shaped bracket, limiting supporting and fixed angle adjusting are completed, and the dangerous position is warned to people at the seaside port through lamplight of the warning lamp.

This invention discloses a dam-break type wave-on test device and method, relating to the field of wave-on testing, and solves the problems of existing wave-on test devices being unable to achieve precise synchronous visualization of the flow field and failing to consider the deck wave load under the combined action of water and air. The invention includes a gate lifting system, a dam-break test water tank, a model attitude adjustment system, and a phenomenon observation system. The dam-break test water tank includes a water storage area, an impact area, and a baffle arrangement area. The water storage area stores test water, the impact area is used to place the test model for wave-on testing, and the baffle arrangement area is used to install sensors and place cables. The model attitude adjustment system is located below the impact area to adjust the model's attitude and control its lifting and lowering. The gate lifting system is located above the water storage area to control the gate's lifting and lowering. The phenomenon observation system records the wave-on test phenomena. Air is pumped into the water to simulate bubble breakage. This invention utilizes a high-speed camera to assist in analyzing the water movement path and simulates the deck wave load under the combined action of water and air by pumping air into the water.

Motor vehicle (1) with an adjustable roof (5) comprising a roof skin (13), a rollover protection element (21) extendable into a protective position (ZT), which in the protective position (ZT) protrudes beyond the roof skin (13) when the roof (5) is in the protective position (ZT), and which has a penetration element (25) at its upper end (24), wherein the roof skin (13) extends obliquely to an imaginary horizontal (HO) at least in an impact area (41) above the rollover protection element (21) at a first angle (α), wherein the penetration element (25) is arranged on the rollover protection element (21) at a second angle (γ) relative to the upper end (24) of the rollover protection element (21), characterized in that the rollover protection element (21) has as its upper end (24) a cross member (33) with a cross-sectional profile to which the penetration element (25) is attached, the cross-sectional profile of the traverse (33) is approximately semicircular with a circumferential wall (35), wherein the circumferential wall (35) has a flat section (36) which is spanned by a second section (37), and wherein the second section (37) adjacent to the upper end (24) has a flat mounting profile wall (38) to which the piercing element (25) is attached, wherein the mounting profile wall (38) runs at the first angle (α) to the imaginary horizontal (HO), the penetration element (25) is attached to the mounting profile wall (38) in such a way that it encloses the second angle (γ) with a central longitudinal axis (MA) of the rollover protection element (21), which coincides with an imaginary vertical (VE), and hits the roof skin (13) approximately perpendicularly in the impact area (41).

The invention relates to the technical field of ultrafine crushing, in particular to a crushing hammer head of an aggregate type impact mill and a crushing disc provided with the hammer head, and the crushing disc comprises a disc body and a plurality of hammer heads fixed on the disc body. The hammer head is an aggregate type impact mill crushing hammer head and comprises a body, a slope windward side and a windward vertical side which are sequentially connected are arranged in front of the body, the slope windward side is located in front of the windward vertical side, and the height of the windward vertical side is larger than that of the slope windward side; the upper part of the windward vertical surface forms a corner impact area. The rear surface of the body is an arc-shaped curved surface in smooth transition; and the position closer to the rear end of the body on the arc-shaped curved surface is lower. The hammer head can obviously reduce air in gas-solid two-phase flow participating in crushing collision in the using process, effectively reduces generation of vortexes, has the advantages of being high in crushing efficiency, long in service life, efficient, energy-saving and the like, and reduces energy consumption per ton of products of an impact mill.