104results about How to "Simplify the external structure" patented technology

The invention relates to a super sound and laser system for measuring three dimensional space and uses thereof, which comprises: a computer, a transversal rail constructed across the tested river, a laser range finder fixed on one end of the transversal rail, a step motor fixed on the other end of the transversal rail, and a testing car which can slide on the transversal rail, wherein the step motor uses cable to drive the testing car to slide transversally on the transversal rail; the testing car incorporates an up-and-down sliding super sound sensor lifter, one end of the lifter is immerged into the river and incorporates a super sound sensor probe; the super sound sensor is on the middle part of the super sound sensor lifter; the super sound sensor probe above and below the river, the step motor and the laser range finder are separately connected with the computer.

The invention discloses a millimeter wave rectangular-circular transition integrated corrugated horn antenna and a processing method and adopts integrated disposable electroforming for processing. A shell is internally provided with an inner cavity communicating from top to bottom in the shell, and the inner cavity consists of a corrugated inner wall radiation section, a circular waveguide extension section, a rectangular-circular transition waveguide section and a rectangular waveguide extension section from top to bottom, and one end of the port of the rectangular waveguide extension sectionin the shell is assembled with a connection part through sleeve joint. The corrugated horn antenna is electroformed by an inner core with the structure the same as that of the inner cavity, the integrated structure is adopted instead of various independent parts, the discontinuity of inner section change and deteriorated smoothness of a transition part caused by the processing dimension difference of all components, assembly and positioning error and other reasons are avoided, voltage standing wave ratio is reduced and antenna performance is improved, and compared with the traditional discrete part scheme, the scheme also reduces the requirement on processing accuracy properly. In the invention, the antenna performance, production technology complexity and time cost are all improved.

The invention discloses a box body shunting device on an assembly line. According to the box body shunting device, a roll ball net chain is adopted to replace a traditional roller assembly line; a flat belt matched with the rolling ball net chain is used to replace a box pushing baffle block so as to control box bodies to move to an operation area and further realize the shunting of the box bodies. According to the box body shunting device, the box bodies can move more stably and the damage to the box bodies due to the excessively-great action force of the box push baffle block is avoided; and in addition, the operation space is saved and the safety is improved.

The method of establishing intelligent virtual control instrument includes the following steps: determining the function, performance index and intelligent virtual control of the instrument; establishing the math model of instrument function and intelligent virtual control; establishing non-intelligent virtual control library; establishing function library; and establishing the development system and the intelligent virtual control instrument in Windows system through making intelligent virtual controls, setting the intelligent virtual controls in proper positions in the development system, running the established virtual instrument, saving the virtual instrument file in memory and loading the saved virtual instrument for operation or edition. The present invention has the features of integration, being economic, interactive, opened, fast in response and green, etc.

The invention relates to an on-road impact vibration wireless real-time monitoring system of a large electric power item, belongs to the technical field of large electric power item transportation and monitoring and aims at providing a device capable of performing long-term, accurate and wireless on-road impact vibration monitoring of a large electric power item. The system comprises an integrated controller, a router and an impact vibration wireless real-time monitoring device, wherein the integrated controller is installed in a cab of a large electric power item transportation vehicle, the router is installed at the top end of the large electric power item, the impact vibration wireless real-time monitoring device is installed at the front end or the rear end of the large electric power item, the integrated controller, the router and the impact vibration wireless real-time monitoring device are communicated with one another through a wireless network, the integrated controller stores messages sent by the router and the impact vibration wireless real-time monitoring device, and the impact vibration wireless real-time monitoring device comprises a high accuracy impact vibration sensor which acquires on-road impact vibration of the large electric power item. The on-road impact vibration wireless real-time monitoring system is applicable to transportation of various large electric power items.

The invention discloses an oil-gas two-medium damping hydraulic cylinder, and belongs to the technical field of hydraulic cylinders. The cylinder comprises a cylinder body, a piston rod and a piston disposed at the right end of the piston rod. An inner cavity is formed in the piston rod, a floating piston capable of sliding along the inner cavity is arranged in the inner cavity, a seal is disposed between the floating piston and the inner wall of the inner cavity, the outer end of the piston rod is provided with an air inlet communicated with an inner cavity in the left side of the floating piston, and the piston or the right end of the piston rod is provided with an oil channel communicating a rodless cavity of the hydraulic cylinder and an inner cavity in the right side of the floating piston. The cylinder is simple in external structure, the outside size of the hydraulic cylinder is not increased, and installation is facilitated; impact energy of compression of inert gas is absorbed, the cylinder is safe and reliable to use, and the service life of the hydraulic cylinder can be prolonged; by adjusting pressure of the injected inert gas, the hydraulic cylinder is suitable for different work conditions, and product quality is stable.

The invention relates to the technical field of medical instruments and provides cervical dilation equipment. The cervical dilation equipment comprises a cervical dilator and a positive-negative pressure generator. The cervical dilator comprises a cervical guide-in tube, a cervix opening dilation balloon and a cervix dilation balloon. The tail end of the cervical guide-in tube is connected with aconnection seat, the front end of the cervical guide-in tube is provided with a liquid medicine outlet, and a first tube, a second tube and a third tube are arranged in the cervical guide-in tube. Theconnection seat comprises a first passage, a second passage, a third passage and a fourth passage. The first passage is communicated with the first tube, the second passage is communicated with the second tube, the third passage is communicated with an inner tube of the cervical guide-in tube, the head end of the cervical guide-in tube is provided with a drainage port, and the fourth passage is communicated with the third tube. The positive-negative pressure generator comprises a water injection mechanism, a negative-pressure suction mechanism, a medicine injection mechanism and a connectionplug. The connection plug is provided with a first insertion needle, a second insertion needle, a third insertion needle and a fourth insertion needle.

The method of establishing intelligent virtual control for intelligent virtual control instrument includes the following steps: determining the configuration of intelligent virtual control; determining the math model of intelligent virtual control including decomposing into modules, establishing math model, algorithm design and program description; establishing the non-intelligent virtual control library; and establishing the development system and making the intelligent virtual control in Windows system through selecting proper non-intelligent virtual controls, setting the physical attributes of the non-intelligent virtual controls, endowing functions for the non-intelligent virtual controls, and testing and fusing the non-intelligent virtual controls. The present invention has the technological effects of integration, being economic, interactive, opened, fast in response and green, etc.

The invention provides an interphone and a connector thereof, which can be used for improving the connecting reliability and convenience, and can be better in durability. The connector of the interphone is provided with a base body; the connector comprises a fixed buckle and a movable buckle, wherein the fixed buckle is buckled in a positioning slot of the interphone host machine; the movable buckle comprises a rotary shaft and a blocking head which is pivoted with the rotary shaft; the blocking head is blocked to the blocking slot of the interphone host machine, and provided with a torsion spring for locking the blocking head in the blocking slot; the torsion spring is hinged with the rotary shaft; and the fixed buckle and the rotary shaft are arranged on the base body. The movable buckle of the connector is connected with the host machine in a rotary buckling manner, so that the connector is dismounted; the torsion spring is arranged in the movable buckle, so that the assembling is simpler; a certain locking force is provided for the blocking head, so that the connecting reliability is improved; and when the connector bears larger external force, the blocking head can be separated from the blocking slot for protecting the connector and the host machine, and therefore, the interphone is prevented from being damaged.

The invention discloses an insulating oil volume compensation device system for an oil immersed electrical device. The insulating oil volume compensation device system comprises an electrical device body filled with insulating oil. An oil volume compensation device is arranged in a low position on the side face of the electrical device and connected with the electrical device through an oil way system. The oil volume compensation device is a volume expansion heat dissipation device. An insulating oil inlet and an insulating oil outlet which are communicated with the oil way system are formed in the volume expansion heat dissipation device. The oil volume compensation device is composed of a plurality of elastic elements and a shell arranged outside the elastic elements. According to the insulating oil volume compensation device system for the oil immersed electrical device, the external structure of the electrical device is greatly simplified, and space is saved; real fuel tank tight welding and sealing can be achieved for the electrical device, and therefore a user does not need to maintain the electrical device, reliability of the electrical device is improved, and manufacturing cost and maintenance cost are saved.

The invention provides a drilling bit assembly, a drilling device and a drilling method and belongs to the technical field of processing. The drilling bit assembly comprises a drill bit, a drill rod,a transmission part and an installing part. The drill bit is fixedly connected with the installing part and is installed on the drill rod through the installing part. The drill bit is perpendicular tothe axis of the drill rod. The transmission part is used for enabling the installing part to rotate. According to the drilling bit assembly provided by the embodiment of the invention, the drill bitis perpendicular to the axial direction of the drill rod and is installed on a rotary head, and the extending direction of the drill rod is changed. When drilling is conducted in an existing hole, thedrill rod can extend into the existing hole in the axial direction of the existing hole, the installing part is driven by the transmission part to rotate, thus the drill bit is driven to drill in thedirection perpendicular to the axis of the drill rod, and the problems that the total length of the drill bit, the drill rod and the like is larger than the diameter of the existing hole, the drill bit and the drill rod cannot be installed in the existing through hole in the radial direction of the existing hole, and thus drilling cannot be achieved are solved.

The invention discloses a gas-liquid damping cylinder. The gas-liquid damping cylinder comprises a cylinder barrel; an upper piston, a separation block and a lower piston are slidingly arranged in the cylinder barrel in sequence for dividing an inner cavity of the cylinder barrel to an upper gas cavity, an upper oil cavity, a lower oil cavity and a lower gas cavity; multiple channels for communicating the upper oil cavity with the lower oil cavity are formed in the separation block; a piston rod with the upper end extending out of the cylinder barrel is arranged in the cylinder barrel; the upper piston and the lower piston fixedly coat the piston rod; the piston rod is slidingly connected with the separation block; a lower gas port for communicating the lower gas cavity with the external is formed in the piston rod; and the external of the piston rod is coated with a gas pipe for communicating the upper gas cavity with the external. The cylinder barrel of the gas-liquid damping cylinder is an integral structure, or is connected only through the separation block, so that the external structure is simple, and the cleaning is easy; and the intake port communicated with the gas pipe of the upper gas cavity and the upper gas port communicated with the gas way of the lower gas cavity are both positioned at the same one end of the gas-liquid damping cylinder, so that the gas-liquid damping cylinder is more convenient to install.

The invention relates to an energy storage rotary heating mining device for a bailing well, and belongs to the technical field of oil extraction tools. The energy storage rotary heating mining devicefor the bailing well comprises a steel wire rope, a bailing pump, a weighting rod, a battery bin, a rotary driving part, a rotary joint and a rotary heater, wherein the steel wire rope, the bailing pump, the weighting rod, the battery bin, the rotary driving part, the rotary joint and the rotary heater are sequentially connected. A lithium battery pack and a remote control switch for controlling the power supply on and off of a battery are arranged in the battery bin, and the lithium battery pack is used for supplying power to the rotary driving part and the rotary heater. A rotator comprisesa screw-in device and a spiral heater encapsulated in a central inner cavity of the screw-in device. A spiral screw-in belt is arranged on the outer periphery of the screw-in device, the lower end ofthe screw-in device is in a cone tip shape, the screw-in device is in driving connection with the rotary driving part, and the spiral heater is electrically connected with the lithium battery pack through the rotary joint; and therefore, the energy storage rotary heating mining device for the bailing well has a simple external structure, on-site construction operation is facilitated, one-time completion of heating and mining is achieved, the cost is reduced, construction operation steps are simplified, and the labor intensity is reduced.

The invention relates to a one-step folding bicycle, comprising a bicycle frame, a handlebar arranged at the front upper part of the bicycle frame, and a saddle arranged at the rear lower part of the bicycle frame. The one-step folding bicycle is characterized in that a handlebar stem capable of rotating back and forth relative to the bicycle frame and a front fork which is capable of rotating back and forth relative to the bicycle frame and is arranged under the handlebar stem are arranged at the front end of the bicycle frame, a front and a rear saddle posts capable of rotating back and forth relative to the bicycle frame are arranged at the rear end of the bicycle frame, the front and rear ends of the saddle are respectively hinged with the upper ends of the front and rear saddle posts, the upper end of the handlebar stem is hinged with the front end of a first connecting rod, the rear end of a second connecting rod is connected with the lower end of the rear saddle post and rotates synchronously therewith, and the rear end of the first connecting rod is hinged with the front end of the second connecting rod. Compared with the prior art, the one-step folding bicycle has the advantages that the handlebar and the saddle can be folded synchronously, so that the folding is convenient; with the bicycle frame consisting of a first and a second bicycle frames, the integral structure of the bicycle is firm, and all parts are located between the first and second bicycle frames after the bicycle is folded, thereby causing the external structure of the bicycle to be simple.

The invention provides an electric fuel pump assembly, including a bottom barrel, an electric fuel pump, an oil level sensor, an oil outlet pipeline, and an oil return pipeline; the electric fuel pump is arranged in the bottom barrel; the bottom of the bottom barrel is provided with a one-way oil inlet valve; the oil outlet pipeline is connected to the oil outlet of the electric fuel pump; the top of the electric fuel pump assembly is provided with an upper cover that matches the fuel tank port, and the oil outlet of the oil outlet pipeline and the oil inlet of the oil return pipeline are set on the upper cover of the fuel tank port ;The oil return pipeline is connected with a pressure regulating valve; the oil level sensor is fixed on the inner shell of the bottom barrel; the upper cover of the fuel tank port is provided with a combined junction box, and the wiring of the oil level sensor and the electric fuel pump are connected to the combined junction box through connectors middle. The invention centrally arranges the pressure regulating valve and the oil level sensor, and also has the oil storage function, has a compact structure, is convenient for installation and maintenance, saves costs, and reduces the probability of fuel leakage.

The invention discloses a soft robot for seepage gap detection in tunnel construction, and relates to the field of tunnel equipment. The soft robot for seepage gap detection in tunnel construction comprises a buffering base, a heat dissipation piece and a mounting seat. A movable cover is arranged on the left side above the buffering base. Locking screws are mounted in the lower end of the movablecover. The movable cover is internally provided with a buffering sponge and a storage battery set respectively. The storage battery set is located in the buffering sponge. Connecting screws are mounted in the right end of the movable cover. A main body shell is arranged on the right side of the movable cover. Heat dissipation openings are formed in the heat dissipation piece at equal intervals. According to the soft robot for seepage gap detection in tunnel construction, the structure is improved, and practicability of the device is greatly improved. The device has the adsorption ability during moving, and has the autonomous power storage endurance capacity. Application timeliness of the device is effectively maintained.

A fluid spraying device of metal materials is used for spraying fluid for an object to be sprayed (4). The fluid spraying device comprises a shell composed of an upper bearing portion (92) and a lower driving containing portion (91). The upper bearing portion (92) is in sliding fit with a plurality of guiding rods (93) fixedly connected with an adjusting base (101) to achieve bearing. The adjusting base (101) is in sliding fit with a sliding groove (102) formed in a machine frame (100). An adjusting motor (21) capable of adjusting the height of the adjusting base (101) is installed at the upper end of the machine frame (100). An internal thread gear disc (96) is clamped into an inner cavity (920) of the upper bearing portion (92) through a thrust bearing. An internal thread is arranged on the inner circumference of the internal thread gear disc (96) and used for being in fit with a walking screw (95) which is parallel to the guiding rods (93) and penetrates through the inner cavity (920).

The invention relates to the field of bathroom devices, and discloses a bathtub and a shower room. The bathtub comprises a bubble blowing device, a control switch and a bathtub body, the control switch is used for controlling starting or stopping of the bubble blowing device, the bathtub body is provided with a bubble outlet, the control switch is connected with the bubble blowing device and positioned on the surface of the bathtub body, the bubble blowing device is positioned in the bathtub body, and a bubble hole of the bubble blowing device corresponds to the bubble outlet. Compared with the prior art, the bathtub has the function of blowing bubbles, the bubble blowing device is positioned in the bathtub body, the control switch is positioned on the surface of the bathtub body, bubble blowing of the bubble blowing device can be controlled only by turning on or off the control switch, the bathtub body and the bubble blowing device can be perfectly combined, and the outer showering space of the bathtub body cannot be occupied, so that an external structure of the bathtub body is simpler.

A fluid spraying assembly convenient and fast to operate is used for spraying fluid towards a to-be-sprayed object (4) and comprises an outer shell (9) composed of an upper supporting part (92) and a lower driving and containing part (91). The upper supporting part (92) is in sliding fit with a plurality of guide rods (93) fixedly connected with a fixing base frame (100) to realize supporting. An inner threaded gear plate (96) is clamped in an inner cavity (920) of the upper supporting part (92) through a thrust bearing. An inner thread is arranged in the inner periphery position of the inner threaded gear plate (96) and used for being matched with a traveling screw (95) which is parallel to the guide rods (93) and penetrates through the inner cavity (920).

The invention discloses a flat plate flow cavity capable of simultaneously applying static pulling force and flow shearing force. The flow cavity comprises a base (1) and a cover plate (2) which are mutually connected, wherein a flow cavity groove (3) is arranged in the base (1); a placing groove (4) is arranged at the bottom of the flow cavity groove (3); two ends of the placing groove (4) are respectively provided with a fixing groove (401) and a sliding groove (402); a flexible film (5) is arranged in the placing groove (4); one end of the flexible film (5) is provided with a first clampingpin (501) buckled into the fixing groove (401); the other end of the flexible film (5) is provided with a second clamping pin (502) buckled into the sliding groove (402); and a plurality of the sliding blocks (6) are arranged in the sliding groove (402) at the outer side of the second clamping pin (502). The flow cavity can simultaneously load static traction force and flow shearing force on cells and adjust the loaded stress.

The invention relates to a fluid spraying assembly with a simple structure for spraying a fluid to a sprayed object (4). The assembly comprises a housing (9) formed by an upper supporting part (92) and a lower driving accommodating part (91), wherein the upper supporting part (92) is slidably matched with a plurality of guide rods (93) which are fixedly connected to a fixed base frame (100) to realize supporting; an internal thread gear disc (96) is clamped in an inner cavity (920) of the upper supporting part (92) through a thrust bearing; and an internal thread is arranged at the inner circumference of the internal thread gear disc (96) for being matched with a traveling screw (95) which is parallel to the guide rods (93) and penetrates through the inner cavity (920).

A fluid spraying device convenient to lock is used for spraying fluid to a to-be-sprayed object (4), and comprises a shell (9) consisting of an upper supporting part (92) and a lower drive containing part (91); supporting is realized by the upper supporting part (92) through sliding fit between the top supporting part (92) and a plurality of guide rods (93) fixedly connected with a fixed bed frame (100); an internal thread gear plate (96) is arranged in an inner cavity (920) of the upper supporting part (92) through a thrust bearing in a clamping manner; the inner circumference of the internal thread gear plate (96) is provided with internal threads used for being matched with a walking screw (95) which is parallel to the guide rods (93) and penetrates through the inner cavity (920).

The invention provides an electric fuel pump assembly, which comprises a bottom barrel, an electric fuel pump, a fuel level sensor, a fuel outlet pipe and a fuel return pipe. The electric fuel pump is arranged in the bottom barrel; the bottom of the bottom barrel is provided with a one-way fuel inlet valve; the fuel outlet pipe is connected with the fuel outlet of the electric fuel pump; the top end of the electric fuel pump assembly is provided with an upper cover which is matched with a fuel tank port, and the fuel outlet of the fuel outlet pipe and the fuel inlet of the fuel return pipe are arranged on the upper cover of the fuel tank port; the fuel return pipe is connected with a pressure regulating valve; the fuel level sensor is fixed on the inner shell of the bottom barrel; and a combined wiring box is arranged on the upper cover of the fuel tank port, and the wire of the fuel level sensor and the wire of the electric fuel pump are connected into the combined wiring box through connector clips. The invention not only realizes the centralized arrangement of the pressure regulating valve and the fuel level sensor, but also has the function of fuel storage. Moreover, the invention has the advantages of compact structure and convenient installation and maintenance, saves the cost and reduces the chance of fuel leakage.

The invention discloses a diesel filter system with a design-optimized low-pressure oil way. The system comprises a filter, a filter base, a filter screen, a starting pump and a one-way valve assembly, wherein the filter base is provided with a cavity; the starting pump is sleeved in the filter screen which is sleeved in the cavity of the filter base; the one-way valve assembly is arranged on thefilter base; and when the starting pump is activated or stops working, the one-way valve assembly controls the on state of an oil way between the filter and the filter base. The system realizes formation of a device having a function of automatically emptying the low pressure oil way by mounting the starting pump, the filter screen and the like in the filter base, so that the structure of the traditional filter base with a hand oil pump is replaced; therefore, the same mounting dimension during the design of a diesel engine and the interchangeability with the traditional diesel filter are ensured. Besides, fuel oil is prevented from forming an internal loop in the startup state of the system, and a fuel oil system is guaranteed to obtain predetermined fuel oil pressure and emptying efficiency. Moreover, the diesel filter system meets the mounting requirements of different engines, and is good in universality.

A motor comprises an electric brush and further comprises a terminal (71) inserted into a brush holder (50) through a through hole (18) of a circumferential wall (12) from the outside of a motor shell (1), a flexible braided wire (63) enabling the terminal (71) to be communicated with the electric brush, and the brush holder (50) fixed inside of the motor shell (1) and made of resin. A cutting groove (56) which is capable of accommodating the terminal (71) from one end side in the axial direction is formed on a circumferential wall (52) of the brush holder (50) at a position corresponding to the terminal (71). A gap, corresponding to the jointing part of the flexible braided wire (63) and the terminal (71), among gaps between the circumferential edge of the cutting groove (56) of the brush holder (50) and the terminal (71) is set to be smaller than the wire diameter of the flexible braided wire (63).

The invention discloses a mobile terminal to achieve integrated design of control bits, simplify the external structure of the mobile terminal and improve the appearance simplification degree of the mobile terminal. The mobile terminal comprises an operation button, a volume-up control position, a volume- down control position and an on-off control position, a first control part arranged corresponding to the volume-up control position, and a second control part arranged corresponding to the volume-down control position and a third control part correspondingly arranged to the on-off control position. Wherein the first control part, the second control part and the third control part are respectively connected with the operation button, and the operation button is used for rotationally controlling the first control part to trigger the volume up control position and the second control part to trigger the volume down control position; and the third control part is pressed and controlled to trigger the startup and shutdown control position.

A fluid spraying assembly achieving uniform spraying is used for spraying fluid to a sprayed object (4). The fluid spraying assembly comprises a shell (9) composed of an upper support portion (92) and a lower containing driving portion (91), the upper support portion (92) is in sliding fit with multiple guiding rods (93) which are fixedly connected with a fixing base frame (100) to achieve supporting, an internal thread gear disc (96) is arranged in an inner cavity (920) of the upper support portion (92) in a clamped mode through a thrust bearing, and the internal circumference of the internal thread gear disc (96) is provided with an internal thread used for being matched with a walking screw (95) which is parallel to the guiding rods (93) and penetrates through the inner cavity (920).

The invention discloses a fluid spraying device for the surface of steel. The fluid spraying device is used for spraying fluid to a sprayed object (4) and comprises a shell (9), wherein the shell (9) consists of an upper supporting part (92) and a lower driving and containing part (91); the upper supporting part (92) is matched with a plurality of guiding rods (93) in a sliding manner to realize supporting, and the plurality of guiding rods (93) are fixedly connected with a fixed base frame (100); an inner thread gear disc (96) is clamped in an inner cavity (920) of the upper supporting part (92) by a thrust bearing; inner threads are arranged at the inner circumferential position of the inner thread gear disc (96) and are used for matching with a traveling screw (95) which is parallel to the guiding rods (93) and penetrates through the inner cavity (920).

The invention relates to an integrated high-temperature-resistant aerosol spray pipe, which belongs to the technical field of cooling and dust removal, and includes an air pipe, a spray pipe water pipe, an air-water mixing chamber and an aerosol nozzle connected to the mixing chamber, and is characterized in that: the air pipe and the spray pipe The water pipes are arranged parallelly in the water pipe of the spray pipe, the mixing chamber is arranged in the water pipe of the spray pipe, and both the air pipe and the water pipe of the spray pipe are connected with the mixing chamber. The air pipe of the present invention is installed inside the water pipe of the spray pipe, the external structure is simple, and the installation and use are convenient; the outer wall of the spray pipe is self-cooled by the cooling water in the pipe, and can be used under high temperature and closed conditions; the air-water mixing chamber of the aerosol nozzle is built-in For the spray pipe, the structure of the external nozzle is simple; the air mist cooling method is adopted, the cooling is uniform, and the cooling intensity can be adjusted in a large range.

The invention discloses a fluid spraying device for metal surface treatment. The fluid spraying device is used for spraying a fluid onto a spraying object (4), and comprises a shell (9) which is composed of an upper supporting part (92) and a lower driving-accommodating part (91), wherein the upper supporting part (92) is in sliding fit with a plurality of guide rods (93), so as to achieve the supporting function; the guide rods (93) are fixedly connected with a left fixing base frame (100) and a right fixing base frame (101); an internally threaded gear disc (96) is clamped in an inner cavity (920) of the upper supporting part (92) through a thrust bearing; an internal thread is formed in the inner circumference of the internally threaded gear disc (96) and used for being matched with a travelling stud (95); and the travelling stud (95) is parallel to the guide rods (93) and penetrates through the inner cavity (920).