CN216815883U

CN216815883U - Steel cylinder air tightness testing machine

Info

Publication number: CN216815883U
Application number: CN202123091255.8U
Authority: CN
Inventors: 王峰; 程仲宇; 朱宏喜
Original assignee: Jiangsu Yuandong General Equipment Co ltd
Current assignee: Jiangsu Yuandong General Equipment Co ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-06-24
Anticipated expiration: 2031-12-10

Abstract

The utility model relates to a steel cylinder air tightness testing machine which is provided with a rack, wherein a feeding station is arranged on the rack, and a detection station is arranged on the side edge of the rack; be equipped with feed mechanism on the material loading station, be equipped with detection mechanism on the detection station, feed mechanism is including transmitting the support, moving movable support, the mounting panel, change the board, the leading wheel, and reset spring, all be equipped with spacing spout on each mounting panel, the one end of each commentaries on classics board is rotated and is connected on the mounting panel, the other end of each commentaries on classics board is connected with the leading wheel after passing spacing spout, reset spring's both ends respectively with changeing board and mounting panel fixed connection, change the board through reset spring's the continuous application of force, and change the board and keep perpendicular with the mounting panel to the pressure of leaning on of spacing spout, the leading wheel on changeing board and changeing the board shifts the steel bottle that transmits the support to detection mechanism through driving motor to moving movable support's drive, detect the steel bottle. The steel cylinder feeding and detecting device can realize quick feeding and detection of the steel cylinder, and is efficient and practical.

Description

Steel cylinder air tightness testing machine

Technical Field

The utility model relates to a steel cylinder air tightness testing machine.

Background

The steel cylinder is a steel cylinder for storing high-pressure oxygen, gas, petroleum liquefied gas and the like, the steel cylinder is safely stored and transported, the gas steel cylinder is generally used for containing permanent gas, liquefied gas or mixed gas, the gas cylinder management of a gas steel cylinder filling unit, a gas steel cylinder inspection unit, a gas steel cylinder use unit, a bottled gas and a gas steel cylinder distribution unit is urgently needed to be improved, and the safety management of the transportation and storage gas steel cylinder is required to be strengthened. The existing steel bottle is required to be subjected to gas tightness tests before being used, so that gas leakage or other more serious losses of the steel bottle in the using process are prevented, the existing detection mode detects the steel bottle one by one through a manual detection mode, and when the detection efficiency is low, the detection result is lack of precision, so that the use of the steel bottle can be influenced, and the steel bottle is very inconvenient.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a steel cylinder air tightness testing machine which can realize quick feeding of steel cylinders and detection of the air tightness of the steel cylinders, and is ingenious in structure, efficient and practical.

The technical scheme for realizing the purpose of the utility model is as follows: the utility model is provided with a frame, a feeding station is arranged on the frame, and a detection station is arranged on the side edge of the frame; the feeding station is provided with a feeding mechanism which can push the steel cylinders to a detection station, the detection station is provided with a detection mechanism which is used for receiving the steel cylinders on the feeding mechanism and detecting the steel cylinders, the feeding mechanism comprises a transmission bracket which can simultaneously place and transport a plurality of steel cylinders, a moving bracket which is driven by a driving motor and is arranged on the transmission bracket in a sliding way, mounting plates which are oppositely arranged on the moving bracket, rotating plates which are rotatably connected on the mounting plates, guide wheels which are rotatably connected on the rotating plates and reset springs which are used for resetting the rotating plates after rotating, the moving direction of the moving bracket is parallel to the extending direction of the transmission bracket, each mounting plate is provided with a limit sliding groove which is parallel to the moving direction of the moving bracket, one end of each rotating plate is rotatably connected on the mounting plate, and the other end of each rotating plate is connected with the guide wheels after passing through the limit sliding groove, the rotation axis of commentaries on classics board sets up with the extending direction of spacing spout is perpendicular, the axis of leading wheel and the rotation axis parallel arrangement who changes the board, reset spring's both ends respectively with change board and mounting panel fixed connection, change the board through reset spring's the application of force that lasts, and change the board and keep perpendicular with the mounting panel to the pressure of leaning on of spacing spout, change the board and change the leading wheel on the board and pass through driving motor and shift the steel bottle of transmission support to detection mechanism to the drive of moving movable support, detect the steel bottle.

Be equipped with the lead screw in the above-mentioned frame, the output at driving motor is fixed to the one end of lead screw, and the other end of lead screw rotates to be connected in the frame, be equipped with the screw that can supply the lead screw to pass on the movable support, be equipped with two parallel arrangement's guide bar in the frame, the extending direction of each guide bar and the extending direction parallel arrangement of frame, the both ends of movable support are equipped with the guide sleeve that can supply the guide bar to pass, and movable support passes through driving motor to the drive of lead screw and the cooperation of lead screw and the cooperation and the frame sliding connection of each guide sleeve and guide bar.

All be equipped with the screw on each guide sleeve, the axis of screw sets up with the axis of guide bar is perpendicular, has all set locking bolt in each screw, and each locking bolt stretches into in the guide sleeve and the top tightly on the guide bar through the cooperation with the screw.

Be equipped with the control mechanism of the material loading quantity of two relative settings and steerable steel bottle on the transmission support in the above-mentioned frame, control mechanism is including installing limiting plate, the spacing cylinder of setting on the limiting plate, rotating the rotor plate of connection on the limiting plate and installing the spacing gyro wheel on the rotor plate in the transmission support both sides, the one end of spacing cylinder is rotated and is connected on the limiting plate, the flexible end of spacing cylinder is rotated with the one end of rotor plate and is connected, spacing gyro wheel on each rotor plate passes through the drive of spacing cylinder, and the rotation of rotor plate stretches into the transmission support in, and carry out limit control to the steel bottle in the transmission support.

Above-mentioned detection mechanism is including the detection jar that is used for the splendid attire to detect liquid, rotate the detection frame of connection in the upper end of detecting the jar and being used for connecing a plurality of steel bottles by detecting motor drive, and be used for supporting the bracing piece of a plurality of steel bottles, the extending direction of each bracing piece and the extending direction parallel arrangement who detects the frame, each both sides that detect the frame all are equipped with a plurality of parallel arrangement's connecting rod, the extending direction of each connecting rod and the extending direction parallel arrangement of bracing piece, it has a plurality of feeding gyro wheels to distribute along the extending direction array of connecting rod on each connecting rod, each steel bottle on each transmission support passes through the promotion of leading wheel on the commentaries on classics board, the support of bracing piece, and the direction entering of each feeding gyro wheel detects in the frame, and detect in the drive entering detection jar through detecting the motor.

The aforesaid is equipped with the frame that compresses tightly that can compress tightly each steel bottle on detecting the frame, all is equipped with a plurality of regulation poles on each compresses tightly the frame, all is equipped with screw thread portion on each regulation pole, all has set lock nut on each screw thread portion, is equipped with a plurality of through-holes that can supply each regulation pole to pass on detecting the frame, each compresses tightly the frame and passes each corresponding through-hole lift connection through adjusting the pole and detect to fix on detecting the frame through the cooperation of lock nut and screw thread portion.

The detection cylinder is provided with a plurality of supporting cylinders, the telescopic end of each supporting cylinder is provided with a supporting block capable of supporting the detection frame when the detection frame does not rotate, the telescopic direction of each supporting cylinder is perpendicular to the extending direction of the detection cylinder, each supporting block is provided with a supporting sinking groove, and each supporting block supports the detection frame through the supporting sinking grooves and the driving of the supporting cylinders.

The utility model has the positive effects that: (1) when the feeding mechanism is arranged on the frame for feeding, each steel cylinder can pass through the guide wheel on the movable support, the guide wheel is reset through the reset spring after each steel cylinder passes through, the driving motor drives the movable support to move, the guide wheel pushes each steel cylinder to the detection mechanism for detection in the moving process of the movable support, the rotating plate is vertically arranged with the mounting plate after the reset spring continuously applies force, on one hand, the guide wheel can be used as a pushing piece to push the steel cylinders for feeding, on the other hand, the limiting sliding groove on the mounting plate can be used for the rotating plate to rotate for each steel cylinder to pass through, and the air tightness of each steel cylinder is detected after each steel cylinder enters the detection mechanism, thereby effectively solving the problems of low efficiency and low accuracy in the prior art during manual carrying and manual detection, greatly improving the feeding efficiency and the detection accuracy of the steel cylinders, high efficiency and practicality.

(2) According to the utility model, the screw rod is driven to rotate by the driving motor, the movable support is driven to move by the matching of the screw rod and the screw hole, and the movable support can be guided to move by the matching of the guide sleeve and the guide rod, so that the device is efficient and convenient.

(3) According to the utility model, the screw hole is formed in the guide sleeve, the locking bolt is arranged in the screw hole, and the locking bolt is matched with the screw hole, so that the stability of connection between the guide sleeve and the guide rod before or after the guide sleeve is moved can be ensured, and the guide sleeve is efficient and convenient.

(4) According to the utility model, the control mechanism is arranged on the rack, the limiting cylinder on the control mechanism drives the rotating plate to rotate, the rotating plate drives the limiting idler wheel to extend and retract in the transmission bracket in the rotating process, and after the steel cylinder in the detection frame is filled with the steel cylinder, the limiting idler wheel enters the transmission bracket to limit the steel cylinder for feeding, so that the device is safe and practical.

(5) According to the utility model, the detection mechanism is set to be the detection motor to drive the detection frame to rotate, the support rod in the detection frame supports the steel cylinder, the feeding roller on the connecting rod guides the feeding of the steel cylinder, and the steel cylinder in the detection frame is immersed into the detection liquid in the detection cylinder for detection through the detection motor after being filled with the steel cylinder, so that the airtightness of a plurality of steel cylinders can be simultaneously detected, the detection efficiency and the detection quality are greatly improved, the safety and the practicability of the steel cylinder are ensured, and the steel cylinder is efficient and practical.

(6) According to the utility model, the detection frame is provided with the compression frame to compress each steel cylinder, and the height of the compression frame is adjusted by matching the threaded part on the adjusting rod with the locking nut, so that the steel cylinder detection device is suitable for various steel cylinders with different sizes, the stability and the safety of the steel cylinder during the gas tightness test are effectively ensured, and the safety and the accuracy of the gas tightness detection of the steel cylinder are further ensured.

(7) According to the utility model, the plurality of supporting cylinders are arranged on the detection cylinder, the detection frame is supported by the supporting cylinders and the supporting blocks on the supporting cylinders, the supporting blocks are retracted during detection, and the overall stability of the detection frame is effectively ensured by the supporting of the supporting blocks during non-detection, so that the detection frame is safe, practical, efficient and convenient.

Drawings

In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which

FIG. 1 is a front view of the overall structure of the steel cylinder gas tightness testing machine of the present invention;

FIG. 2 is a top view of the overall structure of the loading mechanism of the present invention;

FIG. 3 is a schematic view of the overall structure of the mounting plate of the present invention;

FIG. 4 is a plan view of the overall structure of the control mechanism of the present invention;

FIG. 5 is a side view of the overall mechanism of the detection mechanism of the present invention;

FIG. 6 is a schematic view of a connection structure of a support cylinder and a support block according to the present invention;

FIG. 7 is a schematic view of the support block of the present invention.

Detailed Description

Referring to fig. 1 to 7, the utility model is provided with a frame 1, a feeding station is arranged on the frame 1, and a detection station is arranged on the side edge of the frame 1; the steel cylinder detection device is characterized in that a feeding mechanism 2 capable of pushing a steel cylinder to a detection station is arranged on the feeding station, a detection mechanism 4 capable of detecting the steel cylinder is arranged on the detection station and used for carrying the steel cylinder on the feeding mechanism 2, the feeding mechanism 2 comprises a transmission support 21 capable of simultaneously placing and transporting a plurality of steel cylinders, a moving support 22 arranged on the transmission support 21 in a sliding manner and driven by a driving motor 11, mounting plates 23 arranged on the moving support 22 in an opposite manner, rotating plates 24 rotatably connected to the mounting plates 23, guide wheels 25 rotatably connected to the rotating plates 24, and return springs 26 used for returning the rotating plates 24 after rotating, the moving direction of the moving support 22 is parallel to the extending direction of the transmission support 21, each mounting plate 23 is provided with a limiting chute 231 arranged parallel to the moving direction of the moving support 22, and one end of each rotating plate 24 is rotatably connected to the mounting plate 23, the other end of each rotating plate 24 passes through the limiting sliding groove 231 and then is connected with the guide wheel 25, the rotating axis of each rotating plate 24 is perpendicular to the extending direction of the limiting sliding groove 231, the axis of each guide wheel 25 is parallel to the rotating axis of each rotating plate 24, two ends of each return spring 26 are respectively fixedly connected with the rotating plates 24 and the mounting plates 23, the rotating plates 24 are kept perpendicular to the mounting plates 23 through continuous force application of the return springs 26 and pressing of the rotating plates 24 on the limiting sliding grooves 231, the rotating plates 24 and the guide wheels 25 on the rotating plates 24 transfer the steel cylinders of the transmission supports 21 to the detection mechanism 4 through driving of the driving motors 11 on the moving supports 22, and the steel cylinders are detected.

Be equipped with the lead screw 15 in the frame 1, the output at driving motor 11 is fixed to the one end of lead screw 15, and the other end of lead screw 15 rotates to be connected in frame 1, be equipped with the screw that can supply lead screw 15 to pass on the movable support 22, be equipped with two parallel arrangement's guide bar 12 in the frame 1, the extending direction of each guide bar 12 and the extending direction parallel arrangement of frame 1, the both ends of movable support 22 are equipped with the guide sleeve 13 that can supply guide bar 12 to pass, movable support 22 passes through driving motor 11 to the drive of lead screw 15 and the cooperation of lead screw 15 and screw and the cooperation and the frame 1 sliding connection of each guide sleeve 13 and guide bar 12.

All be equipped with the screw on each guide sleeve 13, the axis of screw sets up with the axis of guide bar 12 is perpendicular, has all set locking bolt 14 in each screw, and each locking bolt 14 is through stretching into guide sleeve 13 and the top tightly on guide bar 12 with the cooperation of screw.

Be equipped with the control mechanism 3 of the material loading quantity of two relative settings and steerable steel bottle on the transmission support 21 on the frame 1, control mechanism 3 is including installing limiting plate 31 in transmission support 21 both sides, setting up spacing cylinder 32 on limiting plate 31, rotate swivel plate 33 of connection on limiting plate 31 and install spacing gyro wheel 34 on swivel plate 33, the one end of spacing cylinder 32 is rotated and is connected on limiting plate 31, the flexible end of spacing cylinder 32 rotates with the one end of swivel plate 33 to be connected, spacing gyro wheel 34 on each swivel plate 33 passes through the drive of spacing cylinder 32, and in the rotation of swivel plate 33 stretches into transmission support 21, and the steel bottle carries out the control of limiting quantity in to transmission support 21.

The detection mechanism 4 comprises a detection cylinder 41 for containing detection liquid, a detection frame 42 which is driven by a detection motor 40 to rotate and connected with the upper end of the detection cylinder 41 and is used for receiving a plurality of steel cylinders, and a support rod 43 for supporting the plurality of steel cylinders, the extending direction of each bracing piece 43 and the extending direction parallel arrangement who detects frame 42, each both sides that detect frame 42 all are equipped with a plurality of parallel arrangement's connecting rod 44, the extending direction of each connecting rod 44 and the extending direction parallel arrangement of bracing piece 43, it has a plurality of feeding gyro wheels 45 to distribute along the extending direction array of connecting rod 44 on each connecting rod 44, each steel bottle on each transmission support 21 passes through the promotion of leading wheel 25 on commentaries on classics board 24, the support of bracing piece 43, and in the direction entering detection frame 42 of each feeding gyro wheel 45, and detect in the drive entering detection jar 41 through detecting motor 40.

It can carry out the frame 46 that compresses tightly with each steel bottle to be equipped with on the detection frame 42, all be equipped with a plurality of regulation poles 47 on each frame 46 that compresses tightly, all be equipped with screw thread portion on each regulation pole 47, all set lock nut on each screw thread portion, be equipped with a plurality of through-holes that can supply each regulation pole 47 to pass on the detection frame 42, each frame 46 that compresses tightly passes each corresponding through-hole through adjusting pole 47 and goes up and down to connect and detect to fix on detecting frame 42 through the cooperation of lock nut and screw thread portion.

The detection cylinder 41 is provided with a plurality of supporting cylinders 48, the telescopic end of each supporting cylinder 48 is provided with a supporting block 49 which can support the detection frame 42 when the detection frame is not rotated, the telescopic direction of each supporting cylinder 48 is perpendicular to the extending direction of the detection cylinder 41, each supporting block 49 is provided with a supporting sinking groove 491, and each supporting block 49 supports the detection frame 42 through the supporting sinking groove 491 and the driving of the supporting cylinder 48.

The working principle of the utility model is as follows: in the using process of the utility model, a plurality of steel cylinders are placed on a transmission bracket 21, a driving motor 11 drives a screw rod 15 to rotate, the screw rod 15 drives a movable bracket 22 to move on a frame 1 through the thread matching with a screw hole on the movable bracket 22, the guide sleeve 13 on the movable bracket 22 and a guide rod 12 are matched to perform sliding guide in the moving process, the movable bracket 22 is fixed through the matching of a locking bolt 14 and the screw hole after the sliding is not started or the sliding is finished, each steel cylinder props open each guide wheel 25 in the feeding process, each guide wheel 25 is reset to be vertical to an installation plate 23 after being pressed against a limit sliding chute 231 through the continuous force application of a reset spring 26 after being moved away, and after the number of the transmission bracket 21 reaches the placing number on a detection frame 42, each guide wheel 25 on the movable bracket 22 is driven by the driving motor 11 to push towards the detection frame 42, the supporting rods 43 in the detection frame 42 support the steel cylinders, the feeding rollers 45 on the connecting rod 44 drive the steel cylinders to move into the detection frame 42, after the number of the steel cylinders in the detection frame 42 reaches a limited number, the limiting cylinders 32 on the limiting plate 31 drive the rotating plate 33 to rotate, the rotating plate 33 drives the limiting rollers 34 to extend into the transmission bracket 21 to limit the number of the steel cylinders in the transmission bracket 21 in the rotating process, after the number in the detection frame 42 reaches a limited value, the pressing frame 46 is lifted and adjusted to press the steel cylinders in the detection frame 42, the supporting blocks 49 on the supporting cylinders 48 are separated from the detection frame 42, the detection motor 40 drives the detection frame 42 to rotate, the steel cylinders in the detection frame 42 enter the detection cylinder 41 through rotation, if the steel cylinders have poor air tightness, bubbles are generated in the detection liquid, otherwise, the steel cylinders have good air tightness, detect the completion back and will detect frame 42 and detect each steel bottle in the frame 42 and lift out through detecting motor 40 to sort out the not good steel bottle of gas tightness, thereby reach high-efficient material loading, effect, convenient and practical of high-efficient and accurate detection.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel cylinder air tightness testing machine is provided with a rack (1), wherein a feeding station is arranged on the rack (1), and a detection station is arranged on the side edge of the rack (1); the method is characterized in that: the steel cylinder detection device is characterized in that a feeding mechanism (2) capable of pushing the steel cylinders to a detection station is arranged on the feeding station, the detection station is provided with a detection mechanism (4) capable of carrying the steel cylinders on the feeding mechanism (2) and detecting the steel cylinders, the feeding mechanism (2) comprises a transmission support (21) capable of simultaneously placing and transporting a plurality of steel cylinders, a moving support (22) driven by a driving motor (11) to slide on the transmission support (21), mounting plates (23) oppositely arranged on the moving support (22), rotating plates (24) rotatably connected on the mounting plates (23), guide wheels (25) rotatably connected on the rotating plates (24), and reset springs (26) used for resetting the rotating plates (24) after rotation, the moving direction of the moving support (22) is parallel to the extending direction of the transmission support (21), each mounting plate (23) is provided with a limit chute (231) parallel to the moving direction of the moving support (22), one end of each rotating plate (24) is rotatably connected on the mounting plate (23), the other end of each rotating plate (24) penetrates through the limiting sliding groove (231) and then is connected with the guide wheel (25), the rotating axis of each rotating plate (24) is perpendicular to the extending direction of the limiting sliding groove (231), the axis of the guide wheel (25) is parallel to the rotating axis of the rotating plate (24), two ends of the reset spring (26) are respectively fixedly connected with the rotating plates (24) and the mounting plate (23), and the rotating plates (24) continuously apply force through the reset spring (26), and the pressure of the rotating plate (24) on the limiting sliding groove (231) is kept to be vertical to the mounting plate (23), the rotating plate (24) and a guide wheel (25) on the rotating plate (24) transfer the steel cylinder of the transmission bracket (21) to the detection mechanism (4) through the driving of the driving motor (11) on the movable bracket (22), and the steel cylinder is detected.

2. The cylinder gas tightness testing machine according to claim 1, characterized in that: be equipped with lead screw (15) on frame (1), the output in driving motor (11) is fixed to the one end of lead screw (15), and the other end of lead screw (15) rotates to be connected on frame (1), be equipped with the screw that can supply lead screw (15) to pass on movable support (22), be equipped with two parallel arrangement's guide bar (12) on frame (1), the extending direction of each guide bar (12) and the extending direction parallel arrangement of frame (1), the both ends of movable support (22) are equipped with guide sleeve (13) that can supply guide bar (12) to pass, and movable support (22) are through driving motor (11) to the drive of lead screw (15) and the cooperation of lead screw (15) and screw, and the cooperation and frame (1) sliding connection of each guide sleeve (13) and guide bar (12).

3. The cylinder gas tightness testing machine according to claim 2, characterized in that: all be equipped with the screw on each guide sleeve (13), the axis of screw sets up with the axis of guide bar (12) is perpendicular, all sets locking bolt (14) in each screw, and each locking bolt (14) stretch into in guide sleeve (13) and the top is tight on guide bar (12) through the cooperation with the screw.

4. The cylinder gas tightness testing machine according to claim 1, characterized in that: be equipped with control mechanism (3) of the material loading quantity of two relative settings and steerable transmission support (21) steel bottle on frame (1), control mechanism (3) are including installing limiting plate (31) in transmission support (21) both sides, setting up spacing cylinder (32) on limiting plate (31), rotate rotor plate (33) of connecting on limiting plate (31) and install spacing gyro wheel (34) on rotor plate (33), the one end of spacing cylinder (32) is rotated and is connected on limiting plate (31), the flexible end of spacing cylinder (32) is rotated with the one end of rotor plate (33) and is connected, spacing gyro wheel (34) on each rotor plate (33) are through the drive of spacing cylinder (32), and the rotation of rotor plate (33) stretches into in transmission support (21), and control of limiting quantity is carried out to the steel bottle in transmission support (21).

5. The cylinder gas tightness testing machine according to claim 1, characterized in that: the detection mechanism (4) comprises a detection cylinder (41) for containing detection liquid, a detection frame (42) which is driven by a detection motor (40) to rotate and connected with the upper end of the detection cylinder (41) and used for receiving and taking a plurality of steel cylinders, and support rods (43) for supporting the plurality of steel cylinders, wherein the extension direction of each support rod (43) is parallel to the extension direction of the detection frame (42), a plurality of parallel connection rods (44) are arranged on two sides of each detection frame (42), the extension direction of each connection rod (44) is parallel to the extension direction of the support rod (43), a plurality of feeding rollers (45) are distributed on each connection rod (44) along the extension direction array of the connection rod (44), each steel cylinder on each transmission bracket (21) enters the detection frame (42) through the pushing of a guide wheel (25) on a rotating plate (24), the support of the support rod (43) and the guide of each feeding roller (45), and the driving of the detection motor (40) enters the detection cylinder (41) for detection.

6. The cylinder airtightness testing machine according to claim 5, wherein: it compresses tightly frame (46) that can compress tightly each steel bottle to be equipped with on detection frame (42), each compresses tightly all is equipped with a plurality of regulation poles (47) on frame (46), all be equipped with screw thread portion on each regulation pole (47), all set lock nut on each screw thread portion, be equipped with a plurality of through-holes that can supply each regulation pole (47) to pass on detection frame (42), each compresses tightly frame (46) and passes each corresponding through-hole through regulation pole (47) and goes up and down to connect and detect, and fix on detecting frame (42) through the cooperation of lock nut and screw thread portion.

7. The cylinder airtightness testing machine according to claim 5, wherein: the detection device is characterized in that a plurality of supporting cylinders (48) are arranged on the detection cylinder (41), supporting blocks (49) capable of supporting the detection frame (42) when the detection device does not rotate are arranged at the telescopic ends of the supporting cylinders (48), the telescopic direction of each supporting cylinder (48) is perpendicular to the extending direction of the detection cylinder (41), supporting sunken grooves (491) are formed in the supporting blocks (49), and the supporting blocks (49) support the detection frame (42) through the supporting sunken grooves (491) and the driving of the supporting cylinders (48).