144 results about "Piston Guide" patented technology

Transmission system for a motor vehicle includes a differential drive device configured to distribute a torque to two wheel shafts of an axle, and which includes a coupling device having a coupled position in which the transmission of the torque via the differential drive device is provided and a decoupled position in which the transmission of the torque via the differential drive device is interrupted. The coupling device includes an actuator including a piston guided in axial translation between a retracted position and an extended position; and a thrust bearing which is inserted between the piston and a first coupling part of the coupling device so as to transmit an actuating force of the piston to the first coupling portion and to move the first coupling portion from the uncoupled position to the coupled position during the movement of the piston from the retracted position to the extended position.

The application discloses a piston guiding device and relates to the technical field of piston assembly, which comprises a piston and a connecting rod, a piston guide barrel for defining the piston, a guide mechanism arranged on the piston guide barrel for guiding the insertion of the connecting rod, and rotating parts with adjustable spacing arranged oppositely; a guide barrel cover plate in clamping cooperation with the piston guide barrel, and a piston assembly rod slidingly inserted into the guide barrel cover plate. In the piston guiding device, the guide barrel cover plate fixes the position of the piston assembly rod, the piston assembly rod is guided and stabilized during the advancement of the piston, the piston is not prone to be stuck, the pressing of the rotating parts on the connecting rod can stabilize the clamping of the connecting rod, the insertion of the connecting rod is more stable, the pressure of the rotating parts on both sides of the connecting rod is equal, the rotating parts always move along the axis of the piston during the insertion of the rotating parts, and the centering effect is achieved.

The present invention provides an explosion-proof device for a chemical reaction tank, which relates to the field of chemical explosion protection. The explosion-proof device for a chemical reaction tank comprises a reactor body, wherein a constant pressure tube is fixedly installed at the right end of the reactor body, the constant pressure tube is connected to the interior of the reactor body, a release tube is fixedly installed at the right end of the constant pressure tube, the constant pressure tube and the release tube are sealed, a piston ring is provided in the release tube, the left end of the piston ring is located in the constant pressure tube, a plurality of concentric pistons are provided in the piston ring, a guide tube is fixedly installed in the innermost concentric piston, the inner hole of the guide tube passes through the concentric piston, a push rod is provided in the guide tube, the push rod can slide left and right relative to the guide tube, the right end of the push rod is located on the right side of the guide tube, and a fixed sleeve is fixedly installed on the circumferential surface of the release tube. The explosion-proof device for a chemical reaction tank, by providing a release tube, a piston ring, a safety pin and a negative pressure tank, can achieve the effect of slowly releasing gas in the face of a sudden increase in air pressure, thereby preventing explosion.

A piston housing unit (1) is disclosed, comprising: - a piston (3), - a housing (2), wherein the piston (3) is provided to be displaceable in the housing (2) along an axis (X) and is connected to a transmission element (5) of the piston-housing unit (1), wherein the transmission element (5) is supported by a first bearing (6) and a second bearing (7). Furthermore, a piston (3), a housing (2), a transmission element (5) and an actuator (10) are disclosed.

To provide a novel pump type discharge tool and a novel pump type discharge container that are reduced in force required for press-down operation on a press head.SOLUTION: The present invention relates to a pump type discharge tool 1, and a pump type discharge container 2 that has a mount cap 10, a cylinder body 20, a piston guide 30, a press-down head 40, a spring 50, a synthetic resin-made piston 60 comprising a lower seal piece 61a and an upper seal piece 61b, an inflow-side check valve 70, and a press part 80 provided integrally with the mount cap 10, and configured to press the upper seal piece 61b against an inner peripheral surface of the cylinder body 20 when the piston 60 is at an initial position. When the piston 60 moves down from the initial position to leave the press part 80, the lower seal piece 61a is further pressed against the inner peripheral surface of the cylinder body 20, and the upper seal piece 61b rotates to leave the inner peripheral surface of the cylinder body 20.SELECTED DRAWING: Figure 1

The invention relates to the technical field of early warning devices, in particular to a power equipment high-temperature early warning device which comprises a temperature detection assembly installed in an electrical box, the temperature detection assembly comprises a heat conduction pipe and a piston guide rod which is located in the heat conduction pipe and can longitudinally slide along with temperature changes, and one end of the piston guide rod is in transmission connection with a rack transmission device. The rack transmission device is used for applying downward driving force when the temperature rises, the rack transmission device comprises an adjusting rack and a guide sliding rail, and a cooling assembly and an alarm assembly are installed on the two sides of the lower half end of the guide sliding rail correspondingly. When the temperature continues to rise, the rotating speed of the rotating wind wheel is increased, warning sound is generated, when the temperature continues to rise, the adjusting rack continues to slide downwards, the knocking rod is driven to swing, the knocking rod and the rotating wind wheel are attached, the transmission wind wheel and the knocking rod are collided multiple times, high-frequency warning sound is generated, and the temperature in the electrical box is warned. Low-frequency warning sound is generated through acceleration of the wind wheel in the early stage.

The present application relates to a kind of pipe string manipulator clamp device capable of only grabbing single tubular column, belong to the tubular column automatic technology field of oil and gas drilling equipment.The clamp device is by increasing the main finger driving hydraulic cylinder piston guide mechanism, lateral load is borne by guide mechanism, avoid the radial load that main finger driving hydraulic cylinder piston rod is subjected to, improve the service life of main finger driving hydraulic cylinder and the security of clamp device operation;Increase the pipe blocking mechanism driven by connecting rod assembly in the clamp device, when main finger driving hydraulic cylinder is contracted to the shortest, the maximum size of jaw depth space, can realize the clamp device holding maximum diameter pipe column, when main finger driving hydraulic cylinder is stretched to the longest, the minimum size of jaw depth space, can realize the clamp device holding minimum diameter pipe column, realize the same clamp can hold pipe column of different diameter function, ensure that the clamp cannot simultaneously hold the condition of two pipe columns, realize the purpose of fully automated mechanical hand pipe string operation.

A swivel angle measuring device is configured to indirectly sense a swivel angle of a swashplate or cylinder drum of an axial piston machine. The swivel angle is adjustable using an adjustment piston guided in an adjustment cylinder. The swivel angle measuring device includes a movable encoder and a transducer affixed to a housing. The encoder is formed by two permanent magnets that are carried linearly and translationally by the adjustment piston along its direction of movement and that have a distance to one other.

The invention relates to a one-piece air injection device body (2), comprising: a pressure chamber (3), which encloses a piston guide (20) for receiving a piston (22) and a valve seat (15) for the piston (22); an interface (10) for a control unit (30) for controlling the position of the piston (22); and an air outlet (14). It is provided that the air injection device body (2) further comprises at least two further connections (12) for further air injection devices (4). The invention further relates to an air injection device (4) having such an air injection device body (2) and to an air delivery and / or cleaning module (6).

The utility model discloses a pneumatic elastic claw of a flexible buckle clamp, and relates to the technical field of pneumatic elastic claws, the pneumatic elastic claw is used for grabbing a buckle, and the pneumatic elastic claw comprises a first air inlet pipe, a clamp tail cover, a clamp piston, a second air inlet pipe, an elastic claw, a pushing rod, a clamp cylinder barrel, a piston guide rod and a magnetic ring, the clamp tail cover is in sliding connection with the clamp piston, the clamp tail cover is connected with the clamp cylinder barrel, the clamp tail cover is in fastening connection with the piston guide rod, the clamp piston is in sliding connection with the elastic claw, the clamp piston abuts against the pushing rod, the clamp piston is in sliding connection with the clamp cylinder barrel, and the clamp piston is in sliding connection with the piston guide rod. The second air inlet pipe is connected with the clamp cylinder barrel in a fastening mode, the elastic claw abuts against the pushing rod and is connected with the piston guide rod in a fastening mode, the pushing rod is connected with the clamp cylinder barrel in a sliding mode, and the magnetic ring is connected with the clamp piston in a fastening mode and is connected with the clamp cylinder barrel in a sliding mode.

The utility model relates to the technical field of sole pressing machines, and discloses a flowing type self-balancing floating bottom cylinder which comprises an oil cylinder body of a cuboid structure, a plurality of independent oil cavities are formed in the oil cylinder body side by side in the length direction, oil cylinder openings are formed in the tops of the oil cavities, and the bottoms of adjacent oil cylinders are communicated through one or more oil guide channels. The side walls of the foremost oil cavity and the last oil cavity are each provided with an oil injection opening. A piston guide piece is installed on an oil cylinder opening, a piston rod penetrates upwards from the bottom of the piston guide piece, a fixing plate is arranged at the top end of the piston rod, the oil cylinder body is arranged to be of solid structures on the two sides of parallel oil cavities, guide rods are fixed to the bottoms of the two ends of the fixing plate respectively, the guide rods are movably inserted into guide holes formed in the solid structures, and reset springs are arranged on the guide rods in a sleeved mode. An accessory hydraulic control system and an external auxiliary software and hardware system in a traditional scheme are omitted, energy consumption and manufacturing cost are greatly reduced, the size is reduced, installation space is saved, and installation is more convenient.

Disclosed in the invention is an all-plastic pressing pump comprising: an actuator, an insert, a housing, a container cap, a piston guide, a pump ball, a spring, and a protective cover, made of plastic. The lower end of the piston guide is provided with a slidable sealing part that is inserted into the housing and slidably and sealing connected to the inner wall of the housing. The container cap has a central hole for the piston guide to pass through. A conical frustum sealing part is provided on the piston guide above the slidable sealing part, and the conical frustum sealing part forms a sealed connection with the side wall of the central hole when it bounces up. An air replenishment channel is disposed between the housing and the container cap. A liquid outlet channel and a switch structure are disposed between the actuator and the piston guide, and the switch structure opens the liquid outlet channel when the actuator is pressed down and blocks the liquid outlet channel when the actuator bounces up. A guide sleeve is provided on the top of the container cap and is upwardly sleeved on the outer side of the actuator. An anti-off protrusion is provided at the upper end of the guide sleeve. The actuator is provided with an anti-off hook that is capable of being hooked on the anti-off protrusion. The spring is disposed inside the guide sleeve and is pressed between the top of the actuator and the top of the container cap. The spring is a plastic spring tube with open upper and lower ends and a sealed side, and the structure thereof is simple.

The present invention relates to the technical field of downhole auxiliary equipment, and particularly to a self-sealing steam injection string variable pitch device. A sealing cavity is fixedly connected to the lower end of the cavity bushing. A static pressure sealing ring is fixedly connected to the lower end surface of the sealing cavity. A sealing ring is fixedly connected to the lower end surface of the static pressure sealing ring. A thrust sleeve is fixedly connected to the lower end surface of the sealing ring. A sealing sleeve is fixedly connected to the lower end surface of the thrust sleeve. A piston guide sleeve is fixedly connected to the lower end surface of the sealing sleeve. A cone is connected to the lower end surface of the piston guide sleeve. By using the cavity bushing in cooperation with the sealing cavity, and the sealing ring, thrust sleeve and sealing sleeve in cooperation, and then through the variable diameter short joint braking piston running inside the piston guide sleeve, the present invention achieves flexible control of the overall device, enhances the practical performance of the overall device, and enhances the effect of sealing the annular space and compensating the stress of the pipe string.

The utility model provides a small displacement long plunger tubular deep pump which comprises an oil pipe, an upper coupling, a gap bridge pipe, a short pump cylinder and a pump cylinder lengthening cylinder which are arranged in the gap bridge pipe, the upper end of the long plunger is connected with a sucker rod string through an upper traveling valve and an upper valve cover, and an annular deposited falling object space is formed between the outer circle of the pump cylinder lengthening cylinder and an inner hole of the gap bridge pipe. The short pump is characterized in that a gap is formed between the upper traveling valve and the upper valve cover and the upper coupling, a guiding and righting supporting ring is arranged at the upper end of the short pump cylinder, and a gap facilitating falling of deposited falling objects is formed in the guiding and righting supporting ring. Gaps are arranged between the upper traveling valve and the upper coupling and between the upper valve cover and the upper coupling, no guide supporting piece is arranged, space is provided for sediment falling, the guide righting supporting ring is arranged at the upper end of the short pump cylinder, the piston guide function and the righting supporting function can be achieved, the functions of the piston and the righting supporting ring are integrated, the structure is simplified, and the service life of the pump is prolonged. And the construction efficiency is improved.

A slow expansion compressor (1) of the mechanical liquid piston type comprises a liquid cylinder (8) which pivots about a tilt axis (9) and in which a hydraulic piston (10) is translated, which hydraulic piston is firmly fixed to a connecting rod (11) of a crank (26) connected to a crankshaft (24), the axis of rotation of which is parallel to the tilt axis (9), and a piston guide member (23) maintaining the connecting rod (11) and the hydraulic piston (10) always parallel to the hydraulic cylinder (8), both forming a variable hydraulic volume (12) filled with the working liquid (13), communicating with a gas and liquid reservoir (14) in which the heat exchange and accumulation member (16) is housed, the reservoir (14) and the liquid (13) form a variable pneumatic volume (2) in which the working gas (5) is compressed or expanded.

The invention provides a V-shaped groove transmission mechanism which comprises a transmission shaft provided with V-shaped grooves, balls and a piston guide rail, one end of the transmission shaft is provided with an external spline connected with a motor spindle, the middle of the transmission shaft is provided with four rows of V-shaped grooves, two rows of V-shaped grooves close to the external spline end form a pair, and the two rows of V-shaped grooves are symmetrically arranged on the two sides of the transmission shaft; two rows far away from the external spline end form a pair, and the two rows are symmetrically arranged on the two sides of the transmission shaft and form included angles with the pair of V-shaped grooves close to the external spline side; and the V-shaped groove is internally provided with the ball and is matched with the piston guide rail. According to the invention, stable transmission control can be realized.

The utility model discloses a support auxiliary device, which can effectively guide and support a piston rod by arranging a piston guide shell on the piston rod of a jack in a sleeving manner and arranging a plurality of guide wheels on the guide shell. The bottom end of the guide shell is connected with a hydraulic support through a plurality of supporting plates, when the guide shell is obliquely installed in a roadway with a large slope, the supporting angle changes, a piston rod of the jack is squeezed, and a rubber layer of the guide wheel can assist in supporting and reduce lateral pressure borne by the piston rod; the supporting plate at the bottom end supports the outer circumference of the guide shell, the stress concentration phenomenon is reduced, the structural stability is enhanced, and in addition, an adjusting device is further arranged at the bottom end of the guide shell. According to the adjusting device, the piston rod extending out of the hydraulic cylinder drives the sliding block to slide, so that the angle of the connecting rod is changed, the angle of the shell is changed, the piston rod of the jack is always kept on the same axis, and uneven stress and potential structural damage caused by angle deviation are avoided.

A foam pump comprises a liquid outlet pipe, a pressing head, a pump body connector, a pump body, a lock cover, a main column, an auxiliary column, a core column, a spring, a large piston, a small piston, a guide seat, a ball and a liquid suction pipe, a guide hole of a sliding seat of the large piston is in sliding fit and sealed with a liquid-gas cavity, and a cylindrical air valve element is in sliding fit and sealed with a valve shell; the head of the core column is matched with the liquid outlet cavity, the rod part is located in the auxiliary liquid pipe, the kidney-shaped connecting rod is in sliding fit with the sliding sleeve, and the liquid valve core part is matched with the liquid valve core seat; the liquid outlet cavity is inserted into the liquid-gas cavity; the guide seat is arranged on a bottom plate of the air cavity, an auxiliary liquid pipe of the auxiliary column is in sliding fit with the barrel part, and a piston body is in sliding fit with the liquid cavity; the annular inserting part is inserted into an air cavity 41, the upper end of the air cavity is attached to the bottom plate of the cover body, and the clasp is buckled with the annular edge plate; and the spring is matched with the annular seat plate and the circular stop disc. Air and liquid are mixed at the top of the liquid-gas cavity of the main column, pressurized through the liquid-gas mixing hole and sprayed, the performance of foam is achieved, and the moving speed is high.

The application relates to a quick mounting method of a pneumatic differential lock of an engineering vehicle chassis transfer case, when disassembled, a positioning bolt is extended into a threaded hole of a pneumatic shift fork plate from a through hole of a bearing seat, the position of the pneumatic shift fork plate is fixed, the pneumatic shift fork rod is rotated counterclockwise, the threads between the pneumatic shift fork rod and the pneumatic shift fork plate are separated, and the pneumatic shift fork rod is disassembled from a piston hole of the bearing seat, so that the easily-damaged piston guide ring, the piston O-shaped ring and the easily-fatigued compression spring are replaced. The pneumatic shift fork plate is fixed through external bolts, the easily-damaged parts of the differential lock can be disassembled without disassembling the whole machine, the operation is simple, the maintenance is quick, and the precision of the whole machine is not affected.

This utility model discloses a rotating lip powder cream device, including an upper cover, a pen body, a knob sleeve, and a replacement component. The knob sleeve includes a knob seat and a lower toothed post. The replacement component includes a middle section, a sponge head, a dispensing head, a cotton head seat, a piston, a guide, an upper toothed post, and a screw. The guide is equipped with a reverse ratchet structure. The guide is equipped with positioning ribs, and the guide and the middle section are fixedly connected by the positioning ribs. This utility model adopts a bidirectional ratchet structure, which is novel and supports bidirectional rotation. Clockwise rotation dispenses the powder, while counterclockwise rotation prevents the powder from flowing back. The replacement component is fixed to the pen body with a snap-fit, allowing for easy replacement after use. This aligns with the environmental trend of green consumption, reduces long-term usage costs for consumers, and meets the dual needs of modern users for beauty tools in terms of functionality and sustainability. It also solves the technical problem that such products are often one-piece designs that are discarded after use.

The present invention relates to a piston pump (1) comprising a piston guide (3) disposed at its end (10b), which is provided with an orifice (30) of a diameter corresponding to the rod diameter (D200) of the piston (20) and a shimming device (32) adapted to center the piston guide (3) on the pump body (10), a kit comprising several pistons and piston guides that can be mounted on the pump, and a method of pumping a liquid using such a piston pump. Figure for the abstract: Fig. 1

The utility model relates to a piston-housing unit (1) having a piston (2) and a housing (3) which extends along an axis (X) of the piston-housing unit (1), the piston (2) being designed to be movable parallel to the axis (X) and the piston (2) closing a cavity (4) in the housing (3), the piston-housing unit (1) has a cavity (4), the volume of which can be adapted in accordance with a displacement of the piston (2) parallel to the axis (X), and wherein the piston-housing unit (1) has a piston guide (5) arranged in the cavity (4). The utility model further relates to an actuator operated by a pressure medium, to a piston (2) and to a housing (3).

The invention relates to the field of fuel engines, in particular to an efficient energy-saving four-stroke engine. The piston guide rail is built in the cylinder body, positive pressure originally acting on the cylinder wall is transferred to the piston guide rail, the positive pressure of the piston on the cylinder wall is made to return to zero, friction between the piston and the cylinder is sharply reduced accordingly, the piston is easily driven by the connecting rod, and therefore the efficient and energy-saving effect of the piston system is achieved. An existing cam is transformed into the two-way cam, so that a valve spring can be thrown away, the positive pressure of the ball on the two-way cam is zeroed, the linkage piece drives the valve vertically, the positive pressure of the tappet on the wall of the guide pipe is zeroed, and the efficient energy-saving effect of the valve mechanism is achieved. The method is efficient and energy-saving, and energy can be saved by more than 30%; the structure is simple, manufacturing is easy, cost is low, and risks are avoided; independent innovation is achieved, and development of energy-saving automobiles is promoted.

To provide a two stage cylinder pressure accumulation type discharger capable of preventing a piston guide from being disengaged from a stem due to an impact such as falling.SOLUTION: A holding member 2a including a cylinder 2b, a piston 2c, an accumulator cylinder 2d, an accumulator piston 2e1, a discharge port 2e2, a stem 2e3, and a piston guide 2e, an internal flow path 2f, a biasing part, and an accumulator biasing part, 2g 2h, in the discharger in which a piston guide side 2e3 has a rod part 6 and the rod part 6 has a fitting part side 6a, the discharger 2 has a piston guide receiving part side 2c3, the piston guide receiving part side 2c3 has an elastic part side 2c4, and lowering of the piston guide side 6a with respect to a stem side 2e3 due to disengagement of the fitting part side 2e2 is suppressed by receiving the piston guide side 2e3 from below.SELECTED DRAWING: Figure 1

A bottle clamping device structure used in filling equipment comprises a filling machine used for liquid filling and an electric telescopic rod with a motor, the top of the inner side of the filling machine is fixedly connected with the electric telescopic rod, and the bottom of the electric telescopic rod is fixedly connected with a bottle clamping device; the bottle clamping device comprises a connecting rod, a guide metal shell is arranged on the outer side of the bottom of the connecting rod, an extrusion block is fixedly connected to the bottom of the connecting rod in a welded mode, an empty bin is formed in the inner side of the guide metal shell, a sliding block is slidably connected to the top of the empty bin, an elastic metal strip is fixedly connected to one end of the sliding block, and a piston is fixedly connected to the bottom of the elastic metal strip. A connecting pipe is arranged at the position, close to the bottom of the empty bin, of the guiding metal shell, a fixing ring is fixedly connected to the other end of the connecting pipe, an air bag is fixedly connected to the outer side of the fixing ring, and a rubber protruding point is fixedly connected to the outer side of the air bag. And the air bag is expanded immediately, so that the bottle opening is effectively prevented from being damaged.

The deburring universal floating sleeve device comprises a main body, a mounting seat, pistons, a guide sleeve and a floating disc, the main body and the mounting seat are detachably connected, the mounting seat is used for being connected with an industrial robot, the main body is used for being connected with a pneumatic main shaft, the pneumatic main shaft penetrates through the floating disc and is detachably connected to the floating disc, the pistons are arranged on the mounting seat, and the guide sleeve is arranged on the floating disc. The floating discs are evenly distributed in the main body and slidably connected to the main body, the guide sleeves are fixedly connected to the main body, the pistons abut against the floating discs and are used for pushing the floating discs, rolling pieces are clamped between the floating discs and the guide sleeves, and the floating discs can move relative to the guide sleeves through the rolling pieces. According to the universal floating sleeve device for deburring, through axial floating and radial floating, the precision deviation of a robot, the deviation in the debugging process and the size error of a product can be made up, and the deburring effect is improved.

The utility model discloses a lead offset prepressing ball screw nut which comprises a first nut and a second nut which are matched with a lead screw, and a piston guiding piece is arranged between the adjacent ends of the first nut and the second nut and used for providing guiding and buffering when the first nut and the second nut move relatively. A first connecting ring is arranged at the other end of the first nut, a second connecting ring is arranged at the other end of the second nut, and a plurality of prestressed springs are arranged between the first connecting ring and the second connecting ring and are uniformly distributed on the first connecting ring and the second connecting ring; and a protective sleeve is arranged outside the first nut and the second nut. According to the scheme, the guide piston piece is arranged between the double lead screw nuts, the guide effect is provided when axial movement is generated, and the lead screw nuts are prevented from inclining; the pre-stress spring provides pre-pressure between the double-screw nut and can help the ball screw to eliminate the back clearance.

The utility model belongs to refrigerating machine technical field, concretely provides an expander, including cold finger protection cylinder and the base connected in cold finger one end, the cold finger is inlaid with the cold accumulator of sliding, the cavity that base and cold finger enclose forms is equipped with the guide piston, one end of guide piston is fixedly connected with base, the other end sliding sleeve joint has guide cylinder, guide cylinder with cold accumulator is connected. The utility model provides this kind of expander of improvement guide piston and guide cylinder's relative motion structure, make guide cylinder move forward and backward relative to piston after being subjected to gas force, carry out gas compression and expansion to refrigerate, guide piston can be integrated with expander base and process, reduce processing cost. Simultaneously still can join magnetic force spring subassembly, replace leaf spring in axial direction and carry out the location, can effectively reduce the risk of cylinder collision.

The utility model discloses a circulating deslagging filter which comprises a main body assembly welding piece, a liquid inlet channel is arranged on the upper side of the main body assembly welding piece, a liquid outlet is arranged on the lower side of the main body assembly welding piece, a fixing plate is welded in the main body assembly welding piece, the fixing plate is located on the left side of the liquid inlet channel, and a piston guide assembly is arranged on the right side of the fixing plate. A slag discharging filter screen is arranged on the left side, three through holes are formed in the piston guide assembly and located in the lower side of the piston guide assembly, the piston guide assembly is provided with a piston assembly in a matched mode, and the piston assembly is arranged on the piston guide assembly in a matched mode. And the piston guide assembly is fixedly connected with the piston assembly through an eyelet bolt.

The invention relates to the field of gas flow detection, in particular to a modularized switching multi-gas flow measuring device which comprises an operation base, a module switching assembly and a positioning butt joint assembly, a movable control box is movably arranged at the upper end of the operation base through a lifting assembly, and the lifting assembly comprises a plurality of piston guide rods; a throttle pipe is horizontally arranged at the upper end of the operation base, so that the movable control box can move towards the throttle pipe, a pressure difference detection module is arranged at the upper end of the movable control box, and two switchable modularized pressure difference detection modules are arranged in the movable control box, so that when different gases need to be detected, the pressure difference detection modules can be switched according to the attributes of the gases needing to be detected; the proper pressure difference detection module is selected, then the pressure difference detection module is located in the center of the movable control box by switching pushing control of the telescopic rod, then the throttling pipe and the pressure difference detection module are rapidly structured under the cooperation effect of the lifting assembly and the positioning butt joint assembly, operation is easy, and the device is free of worry and convenient to use.