115results about How to "Avoid breakage damage" patented technology

The utility model provides an optical fiber line protection system, an optical fiber switching unit is arranged between an optical signal input unit and an optical fiber performance monitoring unit, the optical fiber switching unit comprises an adjusting installation shell, a switching mechanism and an adjusting optical cable, one end of the adjusting installation shell is provided with an output connector connected with the optical fiber performance monitoring unit, and the other end of the adjusting installation shell is provided with an optical cable. The other end of the adjusting installation shell is provided with a plurality of input connectors connected with the optical signal input unit in parallel, the switching mechanism is arranged in the adjusting installation shell, a winding cavity is formed in the side, close to the output connector, in the adjusting installation shell, and the adjusting optical cable is spirally arranged in the winding cavity. And the switching mechanism controls the adjusting optical cable to be switched among the plurality of input connectors. According to the scheme, the optical fiber signal quality in the current path can be detected through the arranged optical fiber performance detection unit; when the optical fiber performance detection unit detects that the current optical fiber on-off signal quality is abnormal, data can be fed back, and then the optical fiber switching unit is operated to switch an optical fiber line.

The invention relates to an efficient heat exchanger for petrochemical engineering, and relates to the technical field of heat exchangers. The device comprises a heat exchange shell, a corrosion inhibition box fixed to the heat exchange shell, a plurality of heat exchange pipes and two baffle plates which are rotationally arranged on the heat exchange shell, a processing mechanism for conducting scraping, brushing, fracture detection and marking on the heat exchange pipes correspondingly, and a rotating assembly for conducting rotating driving on the heat exchange pipes. The translation assembly is used for carrying out translation driving on the two baffle plates; the test assembly is used for carrying out deformation detection on the inner wall of the heat exchange shell; the corrosion inhibition box is used for storing a corrosion inhibitor, and a control assembly used for controlling the release amount of the corrosion inhibitor is arranged on the heat exchange shell. The purpose of heat exchange between the petroleum raw material and the heat medium can be achieved, the petroleum raw material can be guided to be evenly distributed in the tube pass, the phenomenon that the petroleum raw material forms laminar flow or uneven flow in the tube pass is avoided, heat stress caused by uneven heating of the heat exchange tube is prevented, and deformation and cracking of the heat exchange tube due to the heat stress are prevented.

The invention discloses a 110kV cross-linked polyethylene insulating material power cable, and relates to the technical field of cables, the 110kV cross-linked polyethylene insulating material power cable comprises a battery cell, the outer side of the battery cell is sleeved with a cross-linked polyethylene insulating layer, the outer side of the cross-linked polyethylene insulating layer is sleeved with an inner uniform-temperature copper foil, the outer side of the inner uniform-temperature copper foil is bonded with an arc-shaped groove plate, the inner side of the arc-shaped groove plate is provided with a filling groove, and the inner side of the arc-shaped groove plate is provided with a filling groove. The inner side of the filling groove is filled with aerogel, a sliding groove plate is clamped to the outer side of the arc-shaped groove plate, and an arc-shaped rod is clamped to the middle of the inner side of the inner sliding groove. According to the friction plate, the brittleness speed of the cross-linked polyethylene insulating layer is effectively slowed down, so that the service life of the cross-linked polyethylene insulating layer is continuously prolonged, a large amount of heat can be generated due to continuous sliding of the friction plate at night, the heat can be continuously conducted to the cross-linked polyethylene insulating layer at the moment, and heat preservation is achieved.

The invention discloses a drilling method for a right-angle square groove, and relates to the field of printed circuit board processing, and the drilling method comprises the following steps: 1, determining the selection of a minimum drill bit according to the thickness of a processed board body and the number of laminated boards, determining the size of the drill bit supported by the thickness and the number of laminated boards, enabling the drill bit with a smaller diameter to generate a smaller R angle, and enabling the drill bit with a smaller diameter to generate a smaller R angle; the drilled right-angle square groove looks closer to an ideal right-angle shape; secondly, the drill bit determined in the first step serves as the minimum drill bit size, namely the first drill bit, the four corners of the groove body are determined through the drill bit, the R angle is reduced to the maximum extent, and the first drill bit serves as the first tool for machining, so that the outline of the right-angle square groove is closer to the perfect right-angle shape. According to the drilling method for the right-angle square groove, by optimizing drill bit selection, the machining sequence and technological parameters, the machined R angle is effectively reduced, the precision and consistency of the right-angle groove are improved, and the requirement of the industry for the high-precision right-angle groove is met.

The invention provides a tobacco leaf picking device. The tobacco leaf picking device comprises a fixing frame, a picking mechanism, crawler wheels, a bottom frame, a first conveying belt, a second conveying belt, a third conveying belt and a collecting frame. The picking mechanism picks off tobacco leaves from plants, the first conveying belt on the bottom frame conveys the tobacco leaves to the side edge, the tobacco leaves are clamped by the second conveying belt and the third conveying belt to be conveyed upwards to the top of the fixing frame, and then the tobacco leaves fall into the collecting frame. The method has the advantages of improving the harvesting quality and yield of the tobacco leaves and the like.

The utility model discloses a coal mine tunneling supporting structure which comprises a movable plate, the top of the movable plate is fixedly connected with a screw rod, the outer surface of the screw rod is in threaded connection with a sleeve, the top of the sleeve is rotationally connected with a top plate through a bearing, and the top of the top plate is evenly and fixedly connected with springs. By arranging the movable plate, the screw rod, the sleeve, the top plate, the spring, the buffer plate, the supporting rod and the movable pipe, the supporting height of coal mine tunneling can be conveniently adjusted, meanwhile, due to the arrangement of the spring and the buffer plate, when the device is extruded, the device can be buffered and protected, breakage and damage are avoided, and the device is convenient to use. By arranging the supporting assembly, the device can be supported, meanwhile, the horizontal state of the device can be adjusted, by arranging the structure, the supporting structure has the advantage that supporting use is convenient when the supporting structure is used, and therefore the using requirements of customers can be met.

The utility model discloses a mobile phone screen assembling and pressing machine, which belongs to the technical field of mobile phone screen assembling, aims at solving the problem that the damage rate of screen assembling is increased due to the fact that a screen is easy to break, and comprises an operation table, a fixed frame is fixed on the top surface of the operation table, an installation frame is arranged above the operation table, and a movable frame is movably clamped on the top surface of the installation frame. A fixing plate is fixed to the bottom surface of the moving frame, an air cushion is fixed to the bottom surface of the fixing plate, and a connecting pipe penetrates through the center of the top surface of the mounting frame; by means of the air cushion, when the screen and the top face of the middle frame are assembled in a press fit mode, the air cushion can protect the top face of the screen, the phenomenon that the screen is broken and damaged due to press fit is avoided, by means of the second air cylinder and the distance sensor, the downward moving distance of the third air cylinder can be adjusted according to the heights of different middle frames, and therefore the screen can be conveniently assembled. And the screen can be further protected, so that the surface of the screen is not easy to damage when the screen is pressed, and the damage rate of the screen during assembly is reduced.

The utility model belongs to the technical field of automobile sensors, and particularly relates to an automobile sensor which comprises an end cover, a cover cap is installed on the right side of the end cover, an assembly structure is fixedly connected to the right side of the end cover, a connecting piece is fixedly connected to the left side of the end cover, and the assembly structure is slidably connected to the interior of the cover cap. A protection mechanism is arranged on the right side of the cover cap, a mounting mechanism is arranged at the joint of the end cover and the cover cap, the outer side of the power line is fixedly wrapped with a rubber sleeve, the outer side of the rubber sleeve is fixedly wrapped with an outer sleeve, and the outer sleeve wraps and protects the rubber sleeve; the connecting position of the left side of the outer sleeve and the right side of the cover cap is reinforced and protected through a sleeve ring and a reinforcing sleeve, so that the connecting position is prevented from being broken and damaged, and the connecting position of the power line and the cover cap is prevented from being broken and damaged. Therefore, the end cover and the cover cap can be conveniently separated and connected through the threaded sleeve.

The invention discloses a multi-stage hydraulic oil cylinder vertical detection device, and relates to the technical field of multi-stage hydraulic oil cylinders, and the multi-stage hydraulic oil cylinder vertical detection device comprises a bottom frame, the top of the bottom frame is fixedly connected with a workbench, the bottom of the workbench is fixedly connected with a hydraulic rod, the output end of the hydraulic rod penetrates through the workbench and extends to the upper side, and the top of the workbench is fixedly connected with an outer frame. A toothed plate is fixedly connected to the front surface of the outer frame, and second sliding rails are symmetrically and fixedly connected to the positions, close to the outer side of the toothed plate, of the front surface of the outer frame. According to the vertical detection device for the multistage hydraulic oil cylinder, when the vertical detection device for the multistage hydraulic oil cylinder is used, the test plate can automatically position the position of the next output end of the oil cylinder body in the upward moving process, and after positioning is completed, the hydraulic rod is continuously controlled to further test the oil cylinder body; the multi-stage hydraulic oil cylinder automatic positioning and detection device can realize multi-stage position automatic positioning and detection operation for a multi-stage hydraulic oil cylinder, has relatively high automation capability, and effectively improves the detection efficiency.

The utility model relates to the technical field of ancient building repair, in particular to a bracket mounting structure for ancient building repair, which comprises a base, a support block, a support rod and a support plate, the support block is arranged at the upper end of the base, the support rod is arranged in the support block, the support plate is arranged at the upper end of the support rod, and the support plate is arranged on the support block. A bearing structure is arranged at the upper end of the supporting plate, and an alarm structure is arranged at the upper end of the supporting plate. If the bearing is not stable enough and the weight of the eave presses the bearing plate downwards, the supporting frame is pushed to move towards the direction of the mounting plate, the falling weight of the eave is buffered through the supporting spring, the supporting frame presses the button, the detector triggers the buzzer, the buzzer makes a sound, and the eave is prevented from falling. And the constructors have enough time to evacuate or support the eave, so that not only is the safety of the constructors guaranteed, but also the problem that the eave is broken and damaged due to rapid descending is prevented.

The utility model discloses a plastic insulating flame-retardant anti-interference control cable, which comprises an inner protective sleeve and five groups of cable cores positioned in the inner protective sleeve, a shielding layer is arranged on the outer surface of the inner protective sleeve, an insulating layer is arranged on the outer surface of the shielding layer, a high-temperature-resistant layer is arranged on the outer surface of the insulating layer, and a protective assembly is arranged on the outer surface of the high-temperature-resistant layer. The cable protection device has the beneficial effects that through the cooperative design of the protection assembly and the limiting assembly, the cable can be efficiently protected from the inside and outside of the cable, the situation that the cable is broken and damaged due to treading of pedestrians when the cable is placed on the ground is prevented, the strength of the cable is improved, the cable can be suitable for more scenes, and the service life of the cable is prolonged. And the practicability of the cable is improved.

The utility model discloses a winding mechanism of a thin film splitting machine, relates to the technical field of thin film winding, and solves the technical problem that when a winding roller is driven by an existing motor to wind a thin film, the thin film is easy to break and damage due to continuous increase of the winding speed. Comprising a support and a winding roller installed on the support, the support comprises a bottom plate and side plates symmetrically installed on the bottom plate, the winding roller is rotatably installed between the two side plates, a roller frame is arranged below the winding roller, a pressing roller attached to the bottom of the winding roller is rotatably installed in the roller frame, and an elastic rod is installed between the roller frame and the bottom plate; a driving shell is installed on the side wall of one side plate, and one end of the winding roller is coaxially connected with a rotating pipe extending into the driving shell. When the film is continuously wound by the winding roller, the rotating speed of the winding roller can be automatically reduced along with the continuous increase of the diameter of the wound film, the phenomenon that the film is snapped and damaged can be effectively avoided, and the winding quality of the film can be improved.

A protection structure for a power output driven shaft of a tractor comprises a power output shell. A driven shaft bearing and a driven shaft bearing clamp spring for limiting the axial movement of the driven shaft bearing are arranged in the power output shell; the power output driven shaft is mounted on the inner sides of the driven shaft bearing clamp spring and the driven shaft bearing; and the power output shell is provided with a protective flange for providing support when the driven shaft bearing snap spring deforms. Axial impact force generated by the universal transmission shaft on the power output shaft during transition of the tractor or working with a machine tool is overcome, and faults such as breakage and damage of a bearing clamp spring, early abrasion of a power output shell and tooth breaking of a gear caused by axial movement of a driven shaft due to overlarge axial impact force are prevented.

This utility model discloses a high-efficiency electric drill with quick-change drill bits, including a drill body and a light source. The drill body is equipped with a storage component for storing the light source, and a connecting collar is provided between the storage component and the drill body. The storage component is equipped with an adjustment component for adjusting the usage state of the storage component. The storage component allows the light source to be hidden and stored when not in use, enhancing the protection of the light source and preventing it from being broken or damaged by external forces, thus helping to extend the life of the light source. At the same time, the use of the collar and the adjustment component allows the lighting position of the light source to be adjusted to ensure the lighting effect, thereby enabling workers to perform drilling operations in dim environments.

The utility model discloses an anti-fracture circuit board, which comprises a circuit board, protective assemblies are arranged above and below the circuit board, the protective assemblies can perform anti-fracture protection on the circuit board, each protective assembly comprises a protective support plate I and a protective support plate II, the protective support plate I is mounted at one end of the circuit board through a screw, and the protective support plate II is mounted at the other end of the circuit board through a screw. A position-adjustable protection top plate is arranged above the circuit board, so that the upper part of the circuit board is protected, and the upper part of the circuit board is prevented from being broken and damaged due to impact; the second protection bottom plate and the first protection bottom plate are arranged below the circuit board in a crossed mode, so that the protection effect on the lower portion of the circuit board is improved; the first protection side plate and the second protection side plate which are adjustable in position are arranged on the two sides of the circuit board, the side ends of the circuit boards with different widths can be protected, and therefore the circuit board is prevented from being broken and damaged by external impact.

The invention relates to the technical field of elevator air conditioner connecting wires, and discloses a tensile elevator air conditioner flat connecting wire, the outer side of a shielding layer is provided with steel wires in front of and behind a wire, the inner side of an outer protection layer is provided with a protection mechanism on the outer side of the shielding layer, and the protection mechanism comprises a flame-retardant layer arranged outside the shielding layer. A first fireproof layer and a second fireproof layer are further arranged outside the flame-retardant layer from outside to inside, the first fireproof layer is further coated with a fireproof coating, a fiber layer is further arranged in the fireproof coating, and the fireproof coating is filled with a filling layer; and an anti-puncture mechanism is also arranged between the outer protection layer and the protection mechanism. The two steel wires are arranged in the elevator air conditioner flat connecting line, the tensile strength of the elevator air conditioner flat connecting line can be effectively improved through the steel wires, the service life of the elevator air conditioner flat connecting line is prolonged, and the protection mechanism is arranged in the elevator air conditioner flat connecting line, so that the fireproof performance of the elevator air conditioner flat connecting line can be improved.

The invention belongs to the technical field of glass processing, and particularly relates to a glass-lined insert tube which comprises an adapter glass tube, a lap joint flange is arranged at the top of the outer surface of the adapter glass tube, and a gas outlet distributor is arranged at the bottom end of the adapter glass tube; an external sleeve is arranged at the top of the gas outlet distributor, and a filling pad cylinder is arranged at the top of the inner wall of the external sleeve. When the switching glass tube is used for ventilation, gas can be directly discharged from the shunting gas port through the inflatable cushion cylinder, so that the problem that the clamping effect of the arc-shaped clamping plate is weakened due to overlarge pressure intensity in the gas outlet distributor is solved, and the negative influence caused by gas flow driving is avoided; and a closed top cylinder arranged at the upper layer part of the gas outlet distributor also prevents the molten glass raw material from permeating through a replaceable filling pad cylinder, so that the assembled glass-lined insert tube not only can work normally, but also has the function of being disassembled and replaced at any time for detection and maintenance work, and ensures that the ventilation work can be normally carried out.

The utility model discloses an adjustable transcranial magnetic stimulation positioning cap which comprises an elastic bridle, a side edge positioning magnetic stimulation block is arranged on the inner side of the elastic bridle, a top end positioning magnetic stimulation block is arranged at the top end of the elastic bridle, and a connecting wire harness is arranged on the side edge of the top end positioning magnetic stimulation block. A connecting plug wire is arranged in the middle of the top end of the top end positioning magnetic stimulation block, and a limiting cap is arranged at the bottom end of the top end positioning magnetic stimulation block. An anti-bending assembly is arranged on the outer side of a connecting plug wire at the top of a top end positioning magnetic stimulation block, and the inner side of an arc-shaped limiting piece is pushed to be attached to the outer portion of the joint of the connecting plug wire and the top end positioning magnetic stimulation block through the elastic force of a damping spring during use; in the using process of the transcranial magnetic stimulation positioning cap, the bending degree of the connecting plug wire is reduced through buffering of the damping spring, and the situation that the connecting position of the connecting plug wire and the top end positioning magnetic stimulation block is excessively bent, broken and damaged and even safety accidents occur is avoided.

The utility model discloses an outdoor travel ceramic tea set which comprises a tea set box, a containing box is fixedly connected between the left side and the right side of the inner wall of the tea set box, a ceramic tea set set is arranged in a groove in the top of the containing box, a frame-shaped base plate is fixedly connected to the inner wall of the tea set box, and a filter plate is arranged at the top of the frame-shaped base plate. The filter plate is clamped to the inner side of the tea set box, the bottom of the filter plate is further fixedly connected with a Y-shaped pressing frame for fixing the ceramic tea set, the ceramic tea set comprises a ceramic teapot body, and the ceramic teapot body is arranged in a groove in the top of the containing box. The outdoor travel ceramic tea set is reasonable in structural design and convenient to use, tea cups, a teapot, a tea canister and the like contained in the ceramic tea set are reasonably combined, occupied space is reduced, and therefore the outdoor travel ceramic tea set is convenient to carry, the tea set can be effectively limited, the tea set can be prevented from being broken and damaged due to jolting in the carrying process, and the service life of the outdoor travel ceramic tea set is prolonged. And a good use effect is achieved.

The utility model belongs to the technical field of brake chambers, and particularly relates to a structure-reinforced brake chamber which comprises an air chamber bin, a cover plate is fixedly connected to the front end of the air chamber bin, a base is arranged in the air chamber bin, a supporting plate is fixedly connected to the front end of the base, and a supporting rod is fixedly connected to the upper end of the supporting plate. The front end of the base is fixedly connected with two limiting rods which are symmetrically arranged up and down on the supporting rod, the supporting rod penetrates through the cover plate and is in sliding connection with the cover plate, and the two limiting rods both penetrate through the cover plate and are in sliding connection with the cover plate. In conclusion, the limiting device is stable in structure, capable of limiting the supporting rod and preventing the supporting rod from deviating from a set movement axis due to the fact that the supporting rod moves too much and is unstable in connection, capable of protecting the supporting rod and the limiting rod through the protection sleeve and preventing the supporting rod and the limiting rod from being broken and damaged, not prone to deformation and high in practicability.

The utility model discloses a subgrade anti-settlement facility which comprises a pavement layer, the bottom of the pavement layer is fixedly connected with a fixing plate, and the bottom of the fixing plate is provided with a waterproof plate. A pit is dug in the ground firstly, then a fixed pipe is placed in the pit, then a user rotates a handle, the handle rotates through a rotating block, the rotating block rotates to drive a worm to rotate, the worm rotates to drive a worm gear to rotate, the worm gear rotates to drive a screw to rotate, and an abutting block moves a movable plate downwards; the movable plate is extruded to move outwards, the protection rod is inserted into soil, the fixing pipe can be limited, the roadbed is effectively prevented from collapsing through supporting of the fixing pipe, the pavement layer achieves the excellent anti-sedimentation effect, the existing mode that lifting is conducted through a rhombic telescopic frame is replaced, and therefore the excellent supporting effect is achieved; and sedimentation is not easy to occur.

The utility model provides a live broadcast device, which relates to the technical field of live broadcast devices for electronic commerce, and comprises a support, one side surface of the support is provided with a clamping mechanism, the clamping mechanism comprises a fixing plate, one side surface of the fixing plate is provided with a clamping plate, a threaded rod penetrates through the interior of the fixing plate, the outer surface of the threaded rod is sleeved with a threaded sleeve block, and the threaded sleeve block is provided with a clamping groove. The threaded sleeve block is in threaded connection with the threaded rod, and the threaded sleeve block is connected into the fixing plate in a sleeved mode. According to the utility model, through the arrangement of the clamping mechanism, a charging wire for a mobile phone placed on the support can be clamped and fixed, so that the situation that the charging wire is connected with the mobile phone loosely due to the weight of the charging wire is avoided, and meanwhile, the situation that the charging wire is separated from the mobile phone due to mistaken touch is also avoided; therefore, the continuity of e-commerce live broadcast is ensured, the influence on the live broadcast caused by the connection problem of the mobile phone and the charging wire is avoided, and in addition, a silica gel pad is arranged.

The invention discloses a double-faced adhesive tape pasting machine and a working method thereof, relates to the technical field of double-faced adhesive tape pasting machines, and aims to solve the problems that in the existing double-layer glass window production process, a double-faced adhesive tape and a glass fixing support need to be bonded and fixed, one side is firstly pasted and then the other side is pasted manually traditionally, time and labor are wasted, and the glass fixing support large in size is large in height and not prone to deformation. The stability is poor during moving, and toppling and falling are prone to occurring. A feeding channel is arranged on one side of the track, a discharging channel is arranged on the other side of the track, and the feeding channel and the discharging channel are connected with the track in a welded mode. The first moving groove is formed in the upper surface of the feeding channel, the first moving groove and the feeding channel are of an integrated structure, a second moving groove is formed in the upper surface of the discharging channel, and the second moving groove and the discharging channel are of an integrated structure; and the feeding plate is arranged at the upper end of the first moving groove, stabilizing frames are arranged on the two sides of the upper end of the feeding plate, and the stabilizing frames are connected with the feeding plate in a welded mode.

The utility model relates to the technical field of coal mine geological exploration, in particular to a drilling rig for coal mine geological exploration, which comprises a vehicle body and a connecting frame fixedly arranged on one side of the bottom end of the vehicle body, one end of the connecting frame is fixedly connected with a supporting plate, and an atomization dust removal module is fixedly arranged on the top of the supporting plate. One side of the atomization dust removal module is fixedly connected with a water supply module, the water supply module is fixedly installed on one side of the vehicle body, the magnitude of force applied by the hydraulic telescopic assembly to the drilling mechanism can be detected through a pressure sensor, and when the coal mine geology is hard and the pressure value detected by the pressure sensor exceeds the set maximum value, the drilling mechanism is started. The single-chip microcomputer controller stops controlling the hydraulic telescopic assembly to continue to extend, a sampling drill barrel on the drilling mechanism can be effectively prevented from being broken and damaged, a water supply module and an atomization dust removal module are used in cooperation, dust generated during drilling sampling can be rapidly eliminated, and the situation that the dust drifts in the air and harms human health can be avoided.

The invention discloses a three-phase electric energy meter data acquisition communication unit, and particularly relates to the technical field of electric energy meter acquisition communication, the three-phase electric energy meter data acquisition communication unit comprises a shell, the shell is provided with a conversion assembly, the conversion assembly comprises a side plate arranged in the shell, the outer side of the shell is rotatably connected with a cover plate through a hinge, and the bottom of the side plate is provided with a support plate. According to the invention, the overload circuit is disconnected through the thermistor, the internal fuse is prevented from being broken and damaged, the elastic transmission pieces are contacted with the corresponding detection terminals one by one during displacement, digital signals transmitted by the pins and the connecting plate can be transmitted to the rotating disc, and the stability during butt joint and data transmission is accurately switched; when the elastic transmission piece does not make contact with the detection terminals, the signal is cut off, the elastic transmission piece can make contact with the detection terminals accurately, automatic switching is easy, the accuracy is high, it is ensured that the communication recovery efficiency is high after butt joint, and large switching and butt joint errors are avoided.

The invention discloses a power distribution cabinet, and belongs to the technical field of power equipment. The power distribution cabinet comprises a cabinet body, a driving module and a paying-off module, the cabinet body comprises a rear plate, a top plate, a bottom plate and two sets of side plates, the top plate and the bottom plate are arranged at the two opposite ends of the rear plate respectively, the two sets of side plates are located on the two opposite sides of the rear plate respectively, and electrical elements installed on the rear plate are connected with electrical elements installed on the side plates through wires; the driving module is arranged on the cabinet body and is used for driving the two groups of side plates to be close to or far away from each other; and the paying-off module is arranged on the cabinet body, when the two sets of side plates are far away from each other, the paying-off module is used for conducting paying-off treatment on the wire, and when the two sets of side plates are close to each other, the paying-off module is used for conducting taking-up treatment on the wire. The power distribution cabinet is convenient for workers to regularly overhaul electrical elements in the power distribution cabinet, the overhaul space can be adaptively expanded according to actual conditions, and the overhaul efficiency is improved.

The utility model discloses a protective cover for an oil return pipe of a diesel engine. The protective cover comprises a protective plate, a supporting arm and an abutting block. Supporting arms and abutting blocks are symmetrically arranged on the bottom face of the protection plate in pairs. The symmetrically-arranged supporting arms and the abutting blocks are arranged on the two sides of the protection plate; the supporting arm and the abutting block are clamped to the top of the oil sprayer. The oil return pipe is arranged between the supporting arms on the two sides and the abutting block in a penetrating mode. The device is suitable for a diesel engine without an integral protective cover cap, is used for protecting the mounting and connecting part of the oil injector oil return pipe, is simple in structure, simple and convenient to manufacture and remarkable in effect, effectively reduces the after-sale fracture oil leakage failure rate of parts of the oil injector oil return pipe of the diesel engine after being used, and effectively improves the use experience of a user.

The application discloses a piezoelectric ceramic actuator. In the application, the piezoelectric ceramic actuator comprises a shell, the shell is internally provided with a placement cavity with an open end, and the shell comprises a point contact part arranged at the other end in the placement cavity; a piezoelectric ceramic assembly comprises a piezoelectric ceramic piece, an elastic piece and a first contact part; the elastic piece is arranged opposite to the inner bottom surface of the shell, and the elastic piece is at least partially connected with the shell; one end of the piezoelectric ceramic piece is fixed to one side of the elastic piece away from the inner bottom surface of the shell; the first contact part is fixed to one side of the elastic piece towards the inner bottom surface of the shell and is arranged opposite to the piezoelectric ceramic piece, the first contact part is partially in a dome shape, the first contact part is partially in a dome shape, and the first contact part in the dome shape abuts against the point contact part to form a point contact. Compared with the prior art, the tangential stress of the actuator during use can be avoided, the service life is prolonged, and the piezoelectric ceramic piece is not prone to damage under stress.