203results about How to "Fixed connection is firm" patented technology

The invention provides a radio frequency coaxial electric coupler with a quick-locking device. The quick-locking device comprises a plug quick-locking device and a socket quick-locking device. The back of an elastic jack catch (16) of the plug quick-licking device is fixed on the plug outer conductor (11). The front portion of the elastic jack catch (16) extends with a snap joint (161). A cone face of the snap joint (1611) is arranged on the front lateral surface of the snap joint (161). The cone face of the snap joint (1611) of the elastic jack catch (16) enables the snap joint (161) to contract inward along the radial direction under the effect of the external force. The periphery of the elastic jack catch (16) is provided with a columnar-shaped unlocking sleeve (15). The plug quick-locking device refers to that a block groove (222) is formed on the front end of an outer conductor (22) of the plug along the axial direction. A catching groove (223) is formed radially outward on the wall of the block groove (222). The quick-locking device of the electric coupler has the advantages of being simple in structure, quick in product assembling, and saving the production cost of the quick-locking device.

The invention discloses a power battery pack comprising a battery cell tray and an insulating board. The power battery pack is provided with clamping buckles, buckling slots, fixed holes, heat radiating ducts, locating pins and the like, wherein the battery cell tray is provided with an aluminum soldering block and a copper soldering block, the fixed holes are used for better clamping modules, the battery cell locating pins are used for locating battery cores, and the ducts are used for radiating heat; the insulating board is provided with the clamping buckles which are respectively and correspondingly buckled in the buckling slots of the battery cell trays, the insulating board is embedded with four anti-rotation nuts connected with the fixed holes of the battery cell trays, the positive pole and the negative pole of the insulating board are marked, the battery cell trays are tightly matched with the clamping buckles of the insulating board, and the insulating board is fixed on electrical equipment or an electric automobile and the modules are clamped tightly through bolts, thus, a plurality of battery cells with flexible packages can be stably and fixedly connected, and the power battery pack has the advantages of stability in connection, good heat radiating property, space conservation, convenience for battery cell locating, assembling, dismounting and maintaining, small internal resistance for contact, realization of inside wiring, no edge folding of the battery cells, large shape size tolerance range of the battery cores and the like.

The invention discloses a lamp with a rotatable lamp cap. The lamp comprises lamp holders and a lamp cap, and is characterized in that: the lamp cap is connected with each lamp holder through a rotating shaft; the rotating shaft comprises four shaft heads which are distributed in a cross shape; each shaft head is provided with annular grooves formed along the circumferential direction of the shaft head; each annular groove is provided with a fastener capable of rotating relative to the corresponding shaft head; two opposite fasteners positioned on a first straight line of the cross shape of the rotating shaft are fixedly connected to the bottom of the lamp cap; and two opposite fasteners positioned on another straight line of the cross shape of the rotating shaft are fixedly connected to opposite lamp holders at the bottom of the lamp cap. The rotation of the lamp cap relative to the lamp holders is realized by adopting the cross-shaped rotating shaft, so that the lamp cap can be adjusted optionally in a 360-degree range relative to the lamp holders, the rotation adjusting range of the lamp cap is expanded, the illumination direction is more flexible, and a power supply lead can be effectively prevented from being knotted due to the rotation of the lamp cap; and moreover, the structure is more compact and the size of the lamp is greatly reduced.

The invention provides an end face coating fixture for a stripe-geometry semiconductor laser and an application thereof. The end face coating fixture comprises a bar strip coating fixture and an auxiliary strip assembly tool. The bar strip coating fixture comprises a sliding part and a combination frame. The combination frame comprises a u-shaped bottom frame and an upper cross frame. Columns at the two sides of the u-shaped bottom frame are internally and respectively provided with slide channels. The two ends of the sliding part are respectively provided with an inverted T-shaped embedded part. The slide channels are matched with the T-shaped embedded parts. The u-shaped bottom frame and the central part of the sliding part are provided with replaceable bar strip clamping ends. The invention also provides an auxiliary strip assembly tool. The auxiliary strip assembly tool is cooperatively used together with the bar strip coating fixture during the bar strip assembling process. The fixture is modular in design, novel in structure, simple to machine, convenient in assembly and high in nimbleness. For bar strips of different types, the fixture is good in adaptability, strong in practicality, easy to clean and maintain, and long in service life.

The invention provides a mobile terminal shell and a manufacturing method therefor. The mobile terminal shell comprises a metal frame body and an insulating part fixedly connected with the metal frame body, wherein at least a positioning part is arranged on the metal frame body; and a filling part matched and jogged with the positioning part is formed in the junction of the insulating part and the positioning part. The invention designs the mobile terminal shell and the manufacturing method therefor; metal and plastic are fixedly matched through a mutual jogging manner so as to enable a relatively high bonding strength between the metal frame body and the insulating part, satisfy the requirement of gradually thinning thicknesses of electronic products and to bring better use experience for users.

The invention relates to walls (roof coverings) of industrial and civil buildings, in particular to a heat conservation construction method for bonding cement based environmental protection thistle boards and insulation plates into composite insulation plates to anchor and adhere outside the outer walls of the composite insulation plates. The invention is characterized in that firstly adhesion agent 6 is used for adhering the insulation plates 3 and the cement based environmental protection thistle boards 5 into the composite insulation plates for standby application; secondly, microfoam gum 2 is used for adhering the composite insulation plates with base courses 1, and nylon sleeve steel nails 4 are used for anchoring in a construction site; thirdly, location references are formed by the mortise-and-tenon joint structure of each L-shaped groove and tongue 10 of two adjacent composite insulation plates, the flatness of the outer surface is also ensured, abutment joint positions are coated with foam rubber 11 to be sealed, flexible anti-cracking putty 7 is applied to the outer surfaces of preprocessed grooves with 1.5 to 2.0 mm depth and 50 to 80 mm width, alkali proof mesh cloth 8 is pressed in the grooves, then the flexible anti-cracking putty 7 is applied, the grooves are leveled up by using the method of pressing the cloth once and applying the putty twice; fourthly, the depressions of the holes of the TOX nylon sleeve steel nails 4 are leveled up by flexible anti-cracking putty 12 made of the same material. When facings 14 are the styles of imitation aluminum-plastic curtain wall facings or imitation facing brick facings, weatherproof silicone seal gum 13 is applied for sealing ornamental joints.

A device for measuring torsions, bendings, and the like, of a target component includes a metallic substrate, an insulating layer, and a sensing layer in the form of a gauge system. The device is configured to be fixed to the target component via a fixed connection.

The invention relates to a prestressed steel strand penetrating guide device and a penetrating usage method thereof, and belongs to the technical field of building construction of nuclear power stations. The device mainly comprises a guide head, a casing pipe, a spring and at least two clamping pieces, wherein the front end of the guide head is a guide end with a gradually expanding section; the rear end of the guide head is a combined end with an inner threaded hole; the excircle front end of the casing pipe is provided with an external thread matched with the threaded hole; a flaring segment which expands gradually is arranged at the front end of an inner hole of the casing pipe; the outer diameter of the spring is less than the major diameter of the front end of the inner hole; the inner diameter of the spring is more than the minor diameter of the inner hole; the envelope shape of the buckled clamping pieces is a conical shape matched with the flaring segment; and the envelope inner hole of the buckled clamping pieces is matched with the outer diameter of a steel strand. By adoption of the invention, the guide head cannot fall off the steel strand no matter whether the steel strand penetrates forwards or is pulled backwards, so that the penetrating operation in a prestressed hole channel is greatly facilitated, the construction efficiency is obviously increased and the construction quality is guaranteed.

The invention discloses a combined wall which is arranged between two adjacent stand columns of a building. The combined wall comprises a top keel, a bottom keel, side keels and a filling plate. The top keel is opposite to the bottom keel. The two ends of both the top keel and the bottom keel are embedded into the two adjacent stand columns respectively. One end of each side keel is arranged on the top keel, and the other end of each side keel is arranged on the bottom keel. The filling plate is detachably arranged in a space formed by the side keels, the stand columns, the top keel and the bottom keel in a filling mode and / or detachably arranged in a space formed by every two adjacent side keels, the top keel and the bottom keel in a filling mode. An external wall thermal insulation decoration integrated wallboard is tightly attached to the outer side of a wall body, and an internal wall decoration integrated wallboard is tightly attached to the inner side of the wall body. The combined wall is the combined wall body capable of conducting heat preservation, heat insulation and sound insulation, wherein the combined wall body is characterized in that an inner insulated board, a middle insulated boar and an outer insulated board clamp two air layers, that is, the combined wall is an anti-seismic and environment-friendly spliced wall body formed by combing the three wallboards and all the keels.

The invention provides a sequencing-batch simultaneous saccharified photosynthetic biological hydrogen production reactor. The reactor comprises a photosynthetic hydrogen production unit and an enzymolysis reaction unit arranged inside the photosynthetic hydrogen production unit, wherein the photosynthetic hydrogen production unit comprises a transparent container; a first seal cap is arranged at the top of the transparent container, and is provided with a charging hole; a discharging hole is formed in the bottom of the transparent container; the enzymolysis reaction unit comprises a lower cylinder, an upper cylinder and a permeable membrane cylinder; a second seal cap is arranged at the upper end of the upper cylinder; and a hydrogen outlet is formed in the second seal cap. The invention further discloses a hydrogen production operation method of the reactor. According to the method, the enzymolysis reaction unit and the hydrogen production reactor are combined together, carbohydrate generated in cellulase hydrolysis is permeated to the hydrogen production part through the permeable membrane cylinder, photosynthetic bacteria are utilized to produce hydrogen by utilizing the permeated carbohydrate, so that enzymolysis and hydrogen production are performed at the same time, and substrate cannot be accumulated, so that the inhibiting effect of carbohydrate on cellulase can be eliminated, the number of reactors can be reduced, and the reaction cost can be reduced.

The invention relates to a pulling wire fixing device of a bendable sheathing canal. The device comprises a pulling ring and a pulling wire, the pulling ring is arranged at the far end of the bendablesheathing canal and fixedly connected with the bendable sheathing canal, and a pulling wire containing groove is formed in the pipe wall of the pulling ring; the far end of the pulling wire is fixedly placed in the pulling wire containing groove, and the near end of the pulling wire extends to the outside of the human body. The pulling wire fixing device solves the problems that by adopting a direct welding mode, the stress concentration is caused, welding spots easily shed, and the pulling wire easily fractures, and the product safety is improved.

The invention discloses a dragging frame component for a reversing valve, which comprises a plate-shaped dragging frame body, wherein a side of the dragging frame body in the width direction is clamped in a connecting hole of a core iron of the reversing valve; and the dragging frame body and the core iron are fixed by compressing the end part of the core iron. The dragging frame component is characterized in that: a butting part for positioning is arranged on the dragging frame body; besides, the dragging frame body and the core iron are compressed and fixed, and the side or bottom of the dragging frame body in the width direction and the connecting hole of the core iron are positioned, so that the area of contact part of the primary dragging frame component and the core iron is increased, when the dragging frame body tends to be loose, the contacting part of the butting part and the hole wall of the connecting hole can stop loosing and tilting of the dragging frame body, so that the compression soundness and high-temperature high-pressure resistance of the dragging frame component and the core iron are improved, and the working stability of the reversing valve is further improved.

The invention provides a light-emitting diode (LED) unit installing module which is used for achieving installation of an LED unit in application environment. The LED unit installing module (10) comprises a heat dissipation block (12) and a shell body (14) which is arranged outside the heat dissipation block (12), the LED unit is arranged on the heat dissipation block in an attached mode, and the shell body forms a connecting structure which is matched with a connecting structure in the application environment. The shell body in the process of forming of the shell body and the heat dissipation block form a whole. The invention further provides an LED lighting device using the LED unit installing module (10) and an automobile headlamp using an LED lighting device. The invention further provides a method manufacturing the LED unit installing module (10).

The invention discloses an automobile panoramic sunroof assembly and an installation method of the automobile panoramic sunroof assembly. The automobile panoramic sunroof assembly comprises a panoramic glass assembly and a sunshade curtain assembly, wherein the panoramic glass assembly is arranged in a skylight opening of the roof of an automobile; the sunshade curtain assembly is arranged in the position, below the panoramic glass assembly, of the roof of the automobile; an appropriate gap is reserved between the sunshade curtain assembly and the panoramic glass assembly; the panoramic glass assembly comprises panoramic fixed glass; the panoramic fixed glass is adhered and fixed on a metal plate at the edge of the skylight opening through glass-structured glue. The automobile panoramic sunroof assembly disclosed by the invention has the advantages that the automobile panoramic sunroof assembly can be flexibly, reliably and fixedly connected with an automobile body, the panoramic fixed glass has enough rigidity and strength, the installation is fixed and reliable, the installation operation is convenient, and the manufacture cost is low; meanwhile a sunshade curtain has a compact structure, therefore more ideal sitting space can be also obtained while a maximal light-transmitting area of a passenger compartment is guaranteed, and stronger application prospects for marketing promotion are obtained.

The invention discloses a PVC electrical tube. According to the main points of the technical scheme, the PVC electrical tube comprises a tube body, wherein a plurality of inner tubes for accommodating power lines or signal lines are arranged in the tube body; an elastic airbag for fixing the inner tubes on the inner wall of the tube body is also arranged in the tube body; the contact parts of the elastic airbag and the inner tubes all are isolating surfaces made of hard rubber; and metal nets for electromagnetic shielding are arranged on the outer wall of the tube body and in the isolating surfaces. The plurality of inner tubes with different functions can be effectively separated after the structure of the elastic airbag is inflated, so that the isolating surfaces wrap the overall PVC electrical tube and wrap the outer wall of the tube body in fit; the condition that individual signal isolation can be carried out on each inner tube is ensured; and signal interference among the inner tubes is avoided. By the structure of the elastic airbag, fixation of the inner tubes can be ensured while the inner tubes are isolated; and the inner tubes contradict the airbag, so that circuit power adjustment, signal shunting and the like are also facilitated after the inner tubes are used for a period of time.

The invention discloses a sleeve rail type electric attachment lifting scaffold which is characterized in that: the structure of an electric lifting mechanism is as follows: a frame body lifting sliding sleeve groove is sleeved on a vertical guide rail frame and takes the vertical guide rail frame as a guide column; a frame body is fixedly connected with a frame body vertical main framework through a third connecting piece; the frame body vertical main framework is fixedly connected with the frame body lifting sliding sleeve groove through a first connecting piece; the vertical guide rail frame is fixedly connected with a building body beam by a first wall-through bolt through an attachment support structure; a toothed column or rack which is vertically arranged is mounted in a middle groove in front of the vertical guide rail frame; a frame body lifting drive device is mounted on the bottom structure of the frame body; and an output shaft of the frame body lifting drive device is meshed with the toothed column through a first gear on a first transmission shaft to form gear and toothed-column meshing transmission. In the whole using period from the time when the scaffold disclosed by the invention is put into use to the time when the construction is finished and the scaffold is dismantled, the fixation and connection of the frame body lifting drive device do not need to be changed, the using process is convenient, and the operation is simple and convenient.

The invention discloses a vehicle-mounted adhesive tape conveyor. An internal combustion engine, a transmission case of a traveling system, a conveyor belt transmission case and a steering wheel and a driving seat of the traveling system are mounted and fixed at the upper part of the front part of a vehicle underframe, wherein a conveyor belt frame comprises a front part and a back part, the inner-side included angle between the longitudinal lower parts of the front and the back parts is 120-165 degrees, the left side and right side of the back part of the conveyor belt frame are articulated and fixed on the left side and right side of the back part of the vehicle underframe, the back part of the conveyor belt frame is articulated and fixed at the upper part of the vehicle underframe in the form of being high at the front and being low at the back, front support rods are articulated and fixed on the left side and right side of the front part of the vehicle underframe, the upper parts of the front support rods are articulated and fixed with the conveyor belt frame, cylinder bodies of two hydraulic oil cylinders are respectively articulated and fixed on the left side and right side of the middle part of the vehicle underframe, and the upper ends of cylinder rods of the two hydraulic oil cylinders are respectively articulated and fixed with the left side and right side of the middle part of the conveyor belt frame at the back part. The vehicle-mounted adhesive tape conveyor is of a loading and conveying device with convenience in movement in a field and high working efficiency.

The invention relates to a heat-insulating plate which comprises a plurality of metal layers and a plurality of heat-insulating layers, wherein the heat-insulating layers are arranged among the metal layers; and the heat-insulating layers comprise a plurality of heat-insulating units with hollow structures. The heat-insulating plate has good heat-insulating property and is particularly suitable for the metallurgical industry. A heat-insulating material is filled in the heat-insulating units and can further improve the heat-insulating property. The invention also provides a manufacturing method of the heat-insulating plate, which comprises the following steps: forming the heat-insulating layers with a plurality of heat-insulating units; and fixedly connecting the metal layers respectively at the upper side and the lower side of the heat-insulating layers. The strength of the heat-insulating plate can be further improved by fixedly connecting the heat-insulating layers with at least oneof the metal layers by explosive welding.

The invention discloses a display assembly, display equipment and an assembly method of the display assembly. The display assembly comprises a display panel, a transparent protection layer and a binding piece, wherein the binding piece is arranged in a way encircling an edge of the display panel, one surface of the binding piece is fixedly connected with the display panel, the other surface of thebinding piece is fixedly connected with the transparent protection layer, the display panel and the transparent protection layer form a binding region and a gap region, the gap region encircles the binding region, and the binding piece encircles the gap region. By the display assembly, the problems of screen breakage, spray, scratch by grinding and optical leakage of the display assembly of the display equipment are effectively solved, the display effect is improved, and the production cost of the display equipment is reduced.

The present invention discloses a fast dismounting and mounting structure of a rear housing of an electronic device. The structure comprises a rear housing, a backboard and a fast fastener, and the fast fastener comprises a pressing column, a rotating disk, a clamp connection column and a turn-lock clasp board. When the mounting between the rear housing and the backboard is performed, the pressingcolumn is pressed to allow each wedge-shaped groove at the bottom portion of the pressing column to cooperate with each wedge-shaped block on the rotating disk, the pressing column and the rotating disk are integrated into one body, the rotating dick is rotated to drive the synchronous rotation of the clamp connection column and the turn-lock clasp board to allow the turn-lock clasp board to fasten the bottom surface of the backboard and allow the turn-lock clasp board to be located out of an opening range of a bar-shaped through hole, namely the turn-lock clasp board cannot pass through thebar-shaped through hole, in this process, the amount of compression of a tensioning spring gradually reaches the maximum value, two ends of the tensioning spring are respectively abutted against the surfaces of the rotating disk and the rear housing, and the tensioning spring applies large axial positive pressures to the rotating disk and the rear housing, so that a pressure of the tensioning spring is applied to the surface of the rear housing, the tightening force of the turn-lock clasp board is applied to the bottom surface of the backboard, the stable fixed connection of the rear housing and the backboard is achieved under the act of the two applied forces, and the mounting is installed.

The invention discloses a panel furniture fast connecting piece which comprises an A-type fast connecting piece body. The A-type fast connecting piece body comprises a vertical plate block, a clamping groove is formed among the left side of the vertical plate block and transverse plate blocks at the two ends of the vertical plate block, a protruding trapezoid fixing block is arranged on the right side of the vertical plate block, a B-type fast connecting piece body is further included, and comprises a trapezoid clamping groove, the two fast connecting piece bodies are used in cooperation and used for connecting two perpendicular plates, and in the use process, the head end of one plate is clamped in the clamping groove, the trapezoid fixing block is clamped and buckled in the trapezoid clamping groove, and the B-type fast connecting piece body is fixed to the other plate. The panel furniture fast connecting piece is a novel concept and a novel mode for furniture manufacturing and using, in the furniture production process, time and labor are not consumed any more, the structural process is not complex any more, any person can manufacture and assemble furniture, perceptual intuition and understandability are achieved, people does not need to learn, and the panel furniture fast connecting piece has the advantages of being simple, firm and attractive in structure, and capable of flexibly changing the internal layout of the furniture and manufacturing the assembled furniture.

The invention discloses a magnetic type water-stop belt connector and a construction method thereof. The magnetic type water-stop belt connector comprises a water-stop belt (200) and a connector box (100) made of magnetic conductive materials, and the water-stop belt (200) is inserted into a seam (101) of the connector box (100). The magnetic type water-stop belt connector further comprises an electromagnetic fixing device which is composed of a plurality of uniformly-distributed electromagnets (102) and magnetic conductive plates (213) which are magnetically connected with all the electromagnets (102). Each electromagnet (102) is fixedly connected to the inner side face of a box body of the seam (101) of the connector box (100), all the electromagnets (102) are electrically connected with an on-off controller (104) through wires (103), and the on-off controller (104) is electrically connected with a power source (110). The magnetic conductive plates (213) are fixedly connected to the water-stop belt (200). According to the magnetic type water-stop belt connector and the construction method thereof, the water-stop belt and the connector box can be reliably and fixedly connected in the construction process.

The invention provides a BMU installing support used for installing a BMU. The BMU installing support comprises a first sliding base, a second sliding base and fixing plates, the first sliding base and the second sliding base are each provided with a sliding groove in the vertical direction, the sliding groove of the first sliding base and the sliding groove of the second sliding base are arranged oppositely, and the opening width of the sliding grooves is adaptive to the thickness of installing plates at the two sides of the BMU; the fixing plates are arranged on the upper portion of the first sliding base and / or the upper portion of the second sliding base, and the BMU can be fixedly connected with the fixing plates. The support is simple in structure, convenient to install and easy to operate, the BMU can be assembled or disassembled just by fastening or disassembling one or two bolts in the installing and overhaul process, operation is convenient and fast, and the work and production efficiency is greatly improved. The invention further provides a power battery pack and an electric automobile.

The invention relates to an LED (light-emitting diode) lamp. The LED lamp comprises a heat sink (1), a light engine (2), an LED driver (3) and a driver housing (4) for containing the LED driver (3), wherein an isolating wall (A) is formed in the heat sink (1), the light engine (2) and the driver housing (4) containing the LED driver (3) are respectively arranged on the first side and the second side of the isolating wall (A), which are opposite to each other, wherein the LED lamp is also provided with a connector (5), which presses the light engine (2) on the first side of the isolating wall (A) and is locked along with the driver housing (4) on the second side of the isolating wall (A).

The invention discloses a movable fire water cannon device for fire protection. The movable fire water cannon device for fire protection comprises a metal pipeline on the lower part and a metal fixingbase. When a metal extensible and retractable connecting rod composed of an upper metal extensible and retractable rod, a fixing threaded bolt and a metal sleeving fixing rod is adjusted, only the fixing threaded bolt needs to be loosened, so that the upper metal extensible and retractable rod can be freely moved, then, the upper metal extensible and retractable rod is fixed through the fixing threaded bolt, and changing can be carried out; through a metal fixing landing leg composed of a connecting circular ring block, a rotary threaded column and a fixed trapezoid block, when the movable fire water cannon device encounters an uneven ground, the fixing trapezoid block can be rotated so that the fixing trapezoid block can move up and down on the rotary threaded column, and the movable fire water cannon device is more stable when used; and through a metal threaded push rod composed of a fixed connecting square block, a metal sleeve connecting column and a metal bulge loop, only the fixed connecting square block needs to be fixed to the metal extensible and retractable connecting rod in a thread rotating manner, and therefore connection is more firm.

The invention relates to a new energy automobile with a flood prevention function, and the automobile comprises an automobile body, wheels, a battery and a power system, wherein the battery is positioned in the automobile body, the battery is mounted in a waterproof device, and the waterproof device is used for preventing water from contacting with the battery; a lifting device and a floating device are further arranged at the bottom of the automobile body, the lifting device is used for lifting the automobile, the floating device is used for enabling the automobile to float on the water surface, and the automobile further comprises a controller used for controlling the lifting device and the floating device. The automobile has the advantages that when the water level rises due to urban inland inundation or flood, the lifting device can automatically lift the automobile, the waterproof device can prevent water from making contact with the battery, and when the water potential is very large, the floating device can enable the automobile to float on the water surface.

The invention provides a counterweight device for a towing-type linear array and the towing-type linear array. The counterweight device for the towing-type linear array comprises a first semi-cylinder counterweight block, a second semi-cylinder counterweight block, a buckle-type locking mechanism and a first hinge, wherein the section of each counterweight block is of a semi-circular ring shape; one contact surface of the first semi-cylinder counterweight block is connected with one contact surface of the second semi-cylinder counterweight block through the first hinge; when the opening angle of the first semi-cylinder counterweight block and the second semi-cylinder counterweight block is zero, the two counterweight blocks are matched with each other to form a hollow cylinder; when the first semi-cylinder counterweight block and the second semi-cylinder counterweight block are opened at a certain angle, a towing cable is placed in a hollow part of the cylinder; the buckle-type locking mechanism is used for clamping the first semi-cylinder counterweight block and the second semi-cylinder counterweight block on the towing cable placed in the hollow part when the opening angle is zero; a first conical flow guide section is further arranged at the end part of the cylinder formed by the first semi-cylinder counterweight block and the second semi-cylinder counterweight block.

The invention discloses a fixed connection structure between a gear and a gear shaft. The fixed connection structure comprises the gear, the gear shaft and a fastening screw, and is characterized in that the gear comprises a D-shaped shaft hole and a fixing hole; the fixing hole is penetrated from the space between two adjacent teeth of the gear to a plane part of the D-shaped shaft hole in the radial direction in the gear; the gear shaft is D-shaped; and a fixing hole part is formed in the length direction of the plane part of a D-shaped gear shaft. By a D-shaped structure, the gear is connected with the gear shaft in an anti-rotation mode; the gear can be reliably and fixedly connected with the gear shaft by arranging the fixed connection structure between two teeth of the gear; the additional size of the gear is not increased, and a tooth-shaped structure cannot be damaged; and the fixed connection structure is simple, reliable, low in cost, easy to realize and convenient to mount.