46results about How to "Use stable" patented technology

The invention relates to a construction motor machine, in particular to a double plate type motor-driven wall dust-absorption polisher which comprises a shell and a handle, wherein two millstones which are driven by a motor are rotated oppositely; the two millstones are provided with soft pads; the outer smooth sides of the soft pads can be conveniently stuck and the abrasive papers having adhesive stickers on the back sides can be conveniently torn down; the dust drops off along the center of opposite rotation when the two millstones horizontally and oppositely rotate and is rightly aligned with a dust absorption pipe under the center; the dust is blown into a bag connected to the dust absorption pipe by a fan; and a circle of soft edges longer than the shell are arranged on the periphery of the shell, thereby preventing the dust from flying. The double plate type motor-driven wall dust-absorption polisher can be used for stably operating, achieving perfect construction effect and greatly increasing the working efficiency, under the condition of eliminating the pollution to the working sides.

The invention discloses a lifting platform capable of storing building waste for building construction. The lifting platform includes a supporting layer board, platform plates, supporting boards, a lifting device, a plate groove and a connecting board; the two platform plates are arranged on the left and right side symmetrically, horizontal racks are fixed to the front and rear sides of the two platform plates respectively, and gears are meshed with the racks; two connecting rods are connected to the lower sides of the two platform plates through rotating first pin shafts, and the lower ends of the left and right connecting rods are rotatably connected to one second pin shaft. when the platform plates move outward, a lifting plate below moves up, correspondingly the upper end of an outer extendable plate below the platform plates is unfolded upward, then the outer extendable plate is exposed outside the platform plates, workers can convey generated waste onto the lifting plate at the lower portion through the outer extendable plate when working on the platform without placing the waste on the platform plates, and falling of the waste from the platform plates is avoided. Convenienceis provided for the workers, and the safety of operation and construction is improved.

The invention discloses a construction site lighting device, and relates to the field of construction equipment. The construction site lighting device mainly solves the problems that when lighting ona construction site, the device is prone to being blown down by the wind in case of high wind, and the safety hidden danger exists. The construction site lighting device is mainly structurally includes a moving base, the moving base is provided with a lighting mechanism, a clearing mechanism, a controller, an automatic collecting and releasing mechanism and a placing mechanism, the automatic collecting and releasing mechanism is located on the upper part of the moving base, the placing mechanism is located on the lower part of the moving base, the device is moved to the suitable position through universal wheels, a telescopic fixed column and ground nailing nails are buried under the ground for reinforcement, a hollow lamp post is driven by a hydraulic cylinder and a motor to lift and rotate, in case of the high wind, the hollow lamp post can be put down to reduce wind resistance, and potential safety hazards are reduced. The construction site lighting device has the beneficial effectsthat the structure is simple, and the practicability is high.

The invention discloses a loading device for a cooking machine. The loading device for the cooking machine comprises a base; a rotary motor is arranged at the upper end of the base; a connection shaftis fixedly connected to the output end of the rotary motor; a cooking pot is fixedly connected to the other end of the connection shaft; a pot cover is arranged at the upper end of the cooking pot; asupporting column is fixedly connected to one side of the upper end of the base and is internally provided with a drive rotary shaft; the other end of the drive rotary shaft is fixedly connected withan external drive device; the drive rotary shaft is sleeved with a mechanical arm; the other end of the mechanical arm is rotationally connected with the top end of the pot cover; a supporting plateis welded to one side, far away from the supporting column, of the upper end of the base; two rotary shafts are symmetrically and rotationally connected to the upper end of the supporting plate; and rotary plates fixedly sleeve the two rotary shafts respectively. The loading device for the cooking machine disclosed by the invention is reasonable in structure and stable in use and avoids the problem that raw materials of food spill out of a hamper during a feeding process, so that the raw materials of food can be totally and intactly sent into the cooking pot.

The invention provides a welding method for a filter screen. The method comprises the steps that two layers of stainless steel filter screens are provided; after surface processing of the two layers of stainless steel filter screens, a tight and firm welding bonding layer is formed between the two layers of filter screens in a vacuum hot-pressing furnace through a vacuum diffusion welding method under compression and heating; and hence, filter screens are combined, and a double-layer filter screen is formed. By the vacuum diffusion welding technology, large-area welding is achieved between the two layers of filter screens, so that the two layers of filter screens diffuse to each other so as to form the firm bonding layer. The filter screen manufactured by the method has the advantages of more stable use, avoidance of unsoldering and a longer service life. In addition, during application of the vacuum diffusion welding technology, a vacuum degree is controlled strictly; the two layers of filter screens are not oxidized easily in the vacuum hot-pressing furnace; and thus, the defect that appearance of the double-layer filter screen processed by the vacuum diffusion welding has a color difference can be avoided.

The invention provides a side-mounted magnetic float level gauge. The side-mounted magnetic float level gauge comprises a main body tube, wherein a connecting flange is arranged on the main body tube;a pneumatic connector is arranged at the upper end of the connecting flange; a display is arranged on the tube wall of the main body tube; an electromagnetic coupling assembly is arranged between thedisplay and the main body tube; the electromagnetic coupling assembly comprises a transducer arranged inside the main body tube; the transducer is used for detecting liquid level change and converting the liquid level change into an electromagnetic signal; a magnetoelectric inductor is arranged inside the display; the magnetoelectric inductor is used for receiving the electromagnetic signal and converting the electromagnetic signal into a display-readable data signal. Through the adoption of the scheme, the side-mounted magnetic float level gauge is more stable to use; in case of factors affecting buoyancy of an ordinary float level gauge, such as an external pressure difference factor and a temperature factor, the side-mounted magnetic float level gauge is more accurate to count.

The invention discloses tunnel supporting grouting equipment and a grouting method thereof. The tunnel supporting grouting equipment comprises a slurrying device, a water cement ratio measuring and control instrument, a slurry pressing pump, a supporting column, a slurry inlet measuring and control box and a slurry outlet measuring and control box, wherein the water cement ratio measuring and control instrument is located on the slurrying device, the slurry pressing pump is connected with the slurrying device through a conveying pipeline, the supporting column needs to grout, the slurry inlet measuring and control box is installed between the slurry pressing pump and the supporting column, and the slurry outlet measuring and control box is installed on one side of the supporting column. The grouting equipment further comprises a main control machine. The main control machine is used for controlling the slurrying device, the water cement ratio measuring and control instrument, the slurry pressing pump, the slurry inlet measuring and control box and the slurry outlet measuring and control box. The slurry inlet measuring and control box is connected to a grouting hole. The slurry outlet measuring and control box is connected to a slurry outlet hole. The interiors of the slurry inlet measuring and control box and the slurry outlet measuring and control box are each provided with a flow sensor, a pressure sensor and a density sensor. The flow sensors are used for monitoring flow parameters of a slurry liquid in real time. The pressure sensors are used for monitoring pressure parameters of the slurry liquid in real time. The density sensors are used for monitoring density parameters of the slurry liquid in real time.

The invention discloses a dewatering-type mini washer which comprises a washing drum, a rotating shaft penetrating through the bottom of the washing drum and a water stirring device arranged in the washing drum. The rotating shaft is connected with the water stirring device and a driving device; in a dewatering state, a dewatering drum is arranged in the washing drum, the dewatering drum and the water stirring device are coaxially arranged, the center of the water stirring device is connected with the center of the drum bottom of the dewatering drum through a directional rotating part, and a drive device drives the rotating shaft, drives the water stirring device to do positive and negative cycle rotation and simultaneously drives the dewatering drum to directionally rotate. Compared with the prior art, the dewatering-type mini washer has the advantages that a small mini washing machine can be provided with the detachable dewatering drum, and directional rotating installation of the dewatering drum is achieved through the internal water stirring device; the small mini washing machine is smaller in size, use is more stable, and the washing drum is larger in size.

The invention provides an LED single-segment constant-current light-modulation drive circuit and method, and the circuit is connected to an LED light source drive circuit. The circuit adjusts the current of an LED source through closed-loop control, and achieves the constant-current light modulation of the LED light source. The circuit specifically comprises a current detection module which compares a supply voltage of the circuit with an adjustable voltage, obtains an error signal, and outputs the difference between an error signal and a reference voltage, wherein the difference serves as a control voltage; and a power adjustment module which is connected with the negative electrode of the LED light source and the current detection module, collects the sampling voltage of the LED light source, compares the sampling voltage and the control voltage, outputs a constant-current control signal, controls the amplitude of the current passing through the LED light source, and controls the current to be a constant current when the adjustable voltage is constant. The circuit achieves a light modulation function of a single-segment LED light source under the condition of guaranteeing the constant drive of the single-segment LED light source, is small in size, is stable in use, is low in cost, and greatly improves the LED performances.

The invention discloses an LED driving circuit which comprises a load which is connected to a first capacitor. A first inductor, a fifth diode, a second resistor and a third resistor are connected in series. A first diode is connected to a third diode and a fourth diode in parallel. The first diode is connected to a 12V AC power supply in parallel. A second diode is connected to the 12V AC power supply in parallel. A switch driving circuit is connected to an electronic transformer compatible circuit in parallel. The electronic transformer compatible circuit is connected to a power factor correction circuit in parallel. A first resistor is connected to the electronic transformer compatible circuit in parallel. The switch driving circuit is connected to a third resistor in parallel. The LED driving circuit has the advantages of a small size and stability in use, the PFC is greatly improved, the compatibility of an ET is improved, the dimming characteristic is improved, the system application is integrated and peripheral devices are reduced, and the cost is reduced at the same time.

The invention discloses a facial tissue extraction box. The facial tissue extraction box comprises a facial tissue extraction box body, a sealing cover and an adjusting device; the facial tissue extraction box body is a box body of which the upper end is provided with an opening and the right end is provided with a through hole; the sealing cover covers the upper end of the facial tissue extraction box body and a penetrating groove running through the left and right is formed in the middle; the adjusting device comprises an adjusting rod, a connecting rod and a support plate; the middle part of the adjusting rod is arranged at the support rod in a rotating manner; the right end thereof penetrates the through hole and is located at the outer side of the facial tissue extraction box body, and the left end thereof is arranged at one end of the connecting rod in the rotating manner; the connecting rod is arranged vertically and the other end thereof is arranged at the lower end of the support plate in the rotating manner; the support plate which can move vertically is arranged in the facial tissue extraction box body; and a support frame is fixedly arranged at the bottom of the facialtissue extraction box body. The facial tissue extraction box is simple in structure and is convenient for extracting facial tissues from the facial tissue extraction box.

The invention relates to keel machining techniques, in particular to a roll material transport device with a material feeding prompt function. The roll material transport device with the material feeding prompt function comprises a turn plate, a turn plate base and a rotary shaft. The turn plate is arranged above the turn plate base. The rotary shaft provided with a bearing is arranged between the turn plate and the turn plate base. A hole is formed in the top of the rotary shaft. A limiting blocking arm is installed in the hole in order to prevent casting-off and knotting of roll materials. The limiting blocking arm comprises two sections, a blocking arm connector is arranged in the middle, and a limiting blocking arm longitudinal rod is inserted into the hole of the rotary shaft. A tension spring is arranged inside a limiting blocking arm cross rod. The roll materials are pre-tightened through an L-shaped tightening pull rod arranged at the front end of the limiting blocking arm cross rod. A distance inductor is arranged beside the tightening pull rod. A forewarning induction point is arranged in the position, close to the tail end, of the limiting blocking arm cross rod. The roll material transport device with the material feeding prompt function is easy to operate and stable to use, the problems of starved feeding, casting-off and knotting in the roll material transport process are reduced, stable operation of an assembly line is guaranteed, and production efficiency is improved; and the labor intensity and risks of manual inspection and monitoring of raw materials are lowered, remote monitoring and dispatching can be achieved, and the roll material transport device with the material feeding prompt function is very convenient to use.

The invention discloses an intelligent anti-freezing drinking trough with an energy-saving water pump. The intelligent anti-freezing drinking trough comprises a drinking trough body, a single chip microcomputer and the energy-saving water pump, a trough cover is arranged on the upper portion of the drinking trough body, a fixed frame is connected on the fixed cover through a fixed bolt, a floatingball device is arranged on the fixed frame, the bottom of the floating ball device sequentially penetrates the fixed frame and the fixed cover and extends into an inner trough body, a support is mounted in the upper surface of the fixed frame, a high-level approach switch and a low-level approach switch are sequentially arranged on one inner side, close to the floating ball device, of the supportfrom top to bottom, a heat insulation layer is arranged in a cavity between the inner trough body and an outer trough body, an automatic temperature-control electric heating belt is mounted at the bottom of the drinking trough body, and an insulating layer is arranged on the outer surface of the automatic temperature-control electric heating belt. The drinking trough is simple in structure and stable in working performance, water level is accurately detected, and the drinking trough is provided with an animal drinking device which is efficient in energy, environmentally friendly, good in anti-freezing heat insulation performance, high in safety coefficient and low in economic cost.

The invention relates to a high-voltage power device with a special voltage withstanding ring. The high-voltage power device comprises a working area (1) and a terminal area (2). The upper surface of a substrate (3) of the working area (1) and the terminal area (2) is provided with an epitaxial layer (4), and the terminal area (2) is provided with a voltage withstanding ring groove (21) downwardly from the upper surface of the epitaxial layer (4). The depth of the voltage withstanding ring groove (21) is smaller than the thickness of the epitaxial layer (4) and internally filled with a light doped P-type GaN material, and the upper surface of the P-type GaN material is flush with the upper surface of the epitaxial layer (4) after filling. Further, the upper surface of the P-type GaN material filled in the voltage withstanding ring groove (21) is covered with an edge passivation layer (5). The high-voltage power device is simple and reasonable in structural design and stable and reliable in use, the area of the terminal area can be effectively reduced while breakdown voltage of the device is effectively boosted, and cost reduction is realized.

The invention discloses multifunctional equipment for arm-power and pectoralis-major training and a training method. Current sports teaching training devices are monotonous in variety, training equipment cannot be adjusted, great convenience is caused to students, and the training performance is directly influenced. The multifunctional equipment comprises a frame (1), the frame is of a groove-typeframe structure, the right end of the groove-type frame is connected with a slant frame (14) through a connecting shaft, the connecting shaft is fixed to the two sides of the groove-type frame through a clamping spring, one end of a supporting plate (11) is fixed to the middle of the bottom face of the slant frame, the other end of the supporting plate is embedded into a groove of a back frame (21), a front frame (22) and the back frame are welded to the bottom plane of the groove-type frame, an upper connecting shaft (20) is fixed to a boss position on the front frame, the middle of the front frame is connected with a middle connecting shaft (19) through an adjusting shaft (23), an arc plate is welded to the bottom of the front frame, and a back connecting shaft is fixed to the bottom ofthe back frame. The multifunctional equipment is used for arm-power and pectoralis-major training.

The invention discloses a gas-liquid separation device based on chemical production, relates to the technical field of gas-liquid separators, and solves the problem that liquid separated by an existing gas-liquid separator cannot be automatically discharged after reaching a certain liquid level. The gas-liquid separation device comprises a gas-liquid separator, and the bottom of the gas-liquid separator is fixedly connected with a liquid collecting box. In the using process of the device, when water stored in the liquid collecting box reaches a certain position, liquid flows into a siphon cover through an opening and closing hole and is discharged out of the liquid collecting box through a drainage main pipe under the siphon effect, and a gas blocking mechanism can descend along with descending of the liquid level, and therefore, when the liquid level is low, the opening and closing hole is re-staggered to block the bottom of the siphon cover to prevent liquid from continuing to flow into the siphon cover, gas without gas-liquid separation in the liquid collecting box is prevented from leaking through the drainage main pipe due to excessive siphon of the liquid, the use is stable, and the automation degree is high.

The invention discloses an endoscopic positioning device and positioning method for digestive tract lesion treatment operation, wherein the endoscopic positioning device comprises a shell. The top ofthe inner wall of the shell is fixedly connected with a first camera, the inner wall of the shell is provided with a groove and fixedly connected with a lighting lamp through the groove, and the bottom of the inner wall of the shell is fixedly connected with a fixed seat; the upper surface of the fixed seat is fixedly connected with a motor, and the top of an output shaft on the motor is fixedly connected with a rotating shaft; the surface, close to the top, of the rotating shaft is fixedly sleeved with a turntable; the lower surface of the turntable is provided with a spiral groove, the innerwall of the spiral groove is slidingly connected with a sliding column, and the bottom of the sliding column is fixedly connected with a positioning column. Through cooperative use of the structures,the problems of inconvenient use and reduction of work efficiency caused because a traditional endoscope cannot position quickly and accurately in an actual use process and the endoscope difficultlytakes effective monitoring pictures are solved.

The invention provides a sealing structure for a cable outgoing hole of an electric device. The sealing structure comprises an insulating gasket, a cable lug rubber protecting column, special-shaped metal pressing rings, special-shaped rubber sealing rings, spring washers and a hollow pressing screwed plug. According to the sequence that the parts are installed in the cable outgoing hole, firstly, wires in the electric device sequentially penetrate the insulating gasket and the cable lug rubber protecting column; next, the hollow pressing screwed plug, the spring washers, the special-shaped metal pressing rings and the special-shaped rubber sealing rings are arranged on the cable in a sleeving mode one by one; then, core wires of the cable are connected with the wires in the electric device to form a string-shaped connected body; and finally, the string-shaped connected body is pushed into the cable outgoing hole of the electric device, the string-shaped connected body and the cable outgoing hole of the electric device are connected and screwed down through the hollow pressing screwed plug with threads and hole opening threads of the electric device, and therefore all the parts can be compressed, the special-shaped rubber sealing rings can generate elastic squeezing, gaps in the hole are squeezed due to inner retraction and outer expansion, and sealing is achieved. The sealing structure is practical, reliable and excellent in waterproof effect.

The invention discloses a dehumidifier controller control panel, which comprises a control mainboard connected with a dehumidifier body and also an expansion board. The control mainboard is provided with an expansion interface, and the expansion interface is connected with the expansion board through a communication bus. The dehumidifier controller control panel can be used on various dehumidifiers, is stable in use, can meet the field use requirements of users, and is high in expansibility and convenient to use.

The invention discloses a device for grinding the inside of a plastic pipe. The device for grinding the inside of the plastic pipe comprises a passing rod, wherein a top cover is arranged above the passing rod; the top cover is fixedly connected with a connecting rod through a top screw bolt; two screw nuts are arranged on the top cover; a position limiting block is arranged at one side of the connecting rod; a clamp block is arranged above the position limiting block; a short rod is connected with the bottom of the clamp block; a passing block is arranged under the connecting rod, and is fixedly connected with a pull rod; one end of the pull rod is connected with a connecting block; an upper press roller is arranged above the connecting block; a lower press roller is arranged under the connecting block. T passing rod is arranged inside the device, so that the device can be continuously used through manually pulling the passing rod during the power failure; in addition, the passing rod penetrates through the whole device, so that the integral structure of the device is more stable. The upper press roller and the lower press roller are respectively installed at the upper end and the lower end of the connecting block, so that in the use process of the device, the upper and lower pipe walls can be subjected to grinding treatment on the plastic pipes, and the efficiency is higher.

The invention discloses a clamping mechanism for roller processing and a using method thereof. The clamping mechanism is provided with three blocking slots, three bulges, three clamping blocks and three U-shaped slots, wherein the U-shaped slots are adaptive to the bulges, and the blocking slots are adaptive to the clamping blocks, so that the clamping blocks are conveniently mounted, are mountedmore compactly, and are more stable in use. The using method of the clamping mechanism comprises the following steps: inserting a roller into an arc-shaped slot, starting a gas cylinder III, pushing apush rod to move by a piston rod, pushing a push block to move by the push rod, pushing a circular ring to move by the push block, pushing a support rod II and a slide sleeve to move, sliding the slide sleeve in a slide hole I, pushing the front ends of the clamping blocks to extrude the roller, pulling elastic parts to be the longest at the rear ends of the clamping blocks through cushion plates, and clamping the roller through the three clamping blocks. The clamping blocks, springs, the elastic parts and the cushion plates are arranged, so that the clamping mechanism has good buffer property, and is convenient in fixing the roller; and meanwhile, rollers of different diameters are conveniently fixed, so that the range of application is wide.

The invention provides a mobile phone USB adapter. The mobile phone USB adapter comprises an adapter body. One end of the adapter body is provided with a USB interface which is in butt connection with a USB data port of an external device. The other end of the adapter body is provided with a mobile phone plug which is in butt connection with a mobile phone data port. The two ends of the adapter body are electrically connected with the USB interface and the mobile phone plug respectively to achieve information connection between the USB interface and the mobile phone plug. The mobile phone USB adapter is simple in structure and can easily expand internal storage of the mobile phone or transmit data.

The invention discloses a fixing base of a six-wheeled trolley. The fixing base comprises a base cross beam and caster mounting plates, wherein the caster mounting plate is arranged below the base cross beam, the caster mounting plates comprise a first caster mounting plate, a second caster mounting plate and a third caster mounting plate, the first caster mounting plate and the third caster mounting plate are arranged below two ends of the base cross beam, the second caster mounting plate is arranged below the middle of the base cross beam, a first positioning pipe is perpendicularly arranged on the first caster mounting plate, and a second positioning pipe is perpendicularly arranged on the third caster mounting plate. With the adoption of the scheme, six casters can be mounted on the fixing base of the six-wheeled trolley, the effect of local hollows of the ground on traveling of the trolley is reduced, a support on the trolley can be fixed by the aid of the first positioning pipe and the third positioning pipe, and the fixing base is convenient to adjust and is more stable to use.

The invention discloses an environment-friendly decorative jointed board which comprises a base board, composite boards and decorative boards. The composite boards are attached to the end faces of the upper end and the lower end of the base board in a size-corresponding and matching mode; the lower ends of the decorative boards are fixed into the composite boards in an embedded mode; a decorative face is arranged at the upper end of each decorative board; the decorative faces are attached to the board faces of the upper ends and the lower ends of the composite boards in a size-corresponding and matching mode; a plurality of mounting holes are formed in the edge of the end face of the outer side of each decorative board; a plurality of crystal decorative nails are guided into the mounting holes; protrusive jointed flanges are arranged at the two ends of the base board; and concave clamping grooves are formed in the two sides of the base board. In this way, a decorative wall face can be rapidly spliced, the decorative jointed board is formed by the base board, the composite boards and the decorative boards in an attaching mode, is environmentally friendly, safe and not prone to deforming, and can be stably used after being exposed in blazing sun and enduring the cold, and the service life is prolonged.

The invention discloses a surface spraying device for sneaker processing. The surface spraying device comprises a gun body, an adjusting knob is arranged on the side wall of the gun body, the adjusting knob is sleeved with a protective sleeve, a groove is formed in the outer wall of the adjusting knob, one end of the protective sleeve is inserted into the groove to be connected with the adjusting knob, a connecting block is fixed to the other end of the protective sleeve, and a connecting groove is formed in the end face of the adjusting knob. The protective sleeve is designed, the protective sleeve is mounted on the surface of the adjusting knob and can rotate freely, so that the protective and isolation effects on the adjusting knob are achieved, and the situation that the trigger amplitude is adjusted by the protective sleeve due to the fact that the protective sleeve touches the adjusting knob is avoided, so that the surface spraying device is more stable to use; and the connecting block is designed, is of a square structure and can be inserted into the connecting groove, so that the protective sleeve and the adjusting knob are connected together and can rotate synchronously, and the adjusting knob is adjusted.

The invention discloses a dustproof cover of a vehicle shock absorber. A main body of the dustproof cover comprises an upper end surface, wherein a cap peak is arranged at the bottom periphery of the upper end surface; and the section of the upper end surface is a cone frustum structure. Compared with the prior art, the dustproof cover has the advantages of simple structure, stable use and large-area promotion and application; the section of the upper end surface in the prior art is a step structure, and the step structure can enable the dustproof cover to be twisted and deformed when being suffered from greater stress, but the slope type upper end surface can release the stress to the high cap peak of the dustproof cover.

The invention relates to the field of measurement devices, and discloses a locking assembly of a pneumatic measurement device. The locking assembly comprises a sliding arm, wherein the sliding arm isprovided with a bracket, an air cylinder is arranged on the bracket, a push-pull rod is arranged in the air cylinder, the push-pull rod is provided with a connecting shaft, the sliding arm is providedwith a rotating shaft, the rotating shaft is provided with a rotating arm, the rotating arm is provided with a measuring head, one end of a transmission chain is connected with the sliding arm, and the other end of the transmission chain is connected with the rotating shaft, the transmission chain is bent to one side of the air cylinder, a transmission rod is arranged at the bending position, theconnecting shaft is connected with the transmission rod, a band-type brake is arranged outside the connecting shaft, a holding rod is fixedly connected with the band-type brake, and the holding rod is fixed to the sliding arm; the sliding arm is provided with a supporting block, the end, making contact with the rotating shaft, of the supporting block is connected with an air bag, and the air bagis filled with reserved gas; and in the self-locking process, the resistance between the top end of the holding rod and the connecting shaft is linearly increased until the locking is completed, and the air bag enables the use of the measuring device to be more stable.