CN117804707B - Hydraulic cylinder tightness testing device and testing method - Google Patents
Hydraulic cylinder tightness testing device and testing method Download PDFInfo
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- CN117804707B CN117804707B CN202410231695.8A CN202410231695A CN117804707B CN 117804707 B CN117804707 B CN 117804707B CN 202410231695 A CN202410231695 A CN 202410231695A CN 117804707 B CN117804707 B CN 117804707B
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- 238000012360 testing method Methods 0.000 title claims abstract description 35
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- 239000003921 oil Substances 0.000 claims description 52
- 230000007246 mechanism Effects 0.000 claims description 33
- 239000010720 hydraulic oil Substances 0.000 claims description 22
- 230000005489 elastic deformation Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
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Abstract
The invention relates to the technical field of hydraulic cylinder detection, and discloses a hydraulic cylinder tightness testing device and a testing method, wherein the device comprises a main frame, a moving groove communicated with an inner cavity of the main frame is formed in the middle of the top end of the main frame along the left-right direction, a first sliding groove is formed in the front and rear ends of the left side of the top end of the main frame along the left-right direction, and a second sliding groove is formed in the front and rear ends of the left side of the top end of the inner cavity of the main frame along the left-right direction; the left end and the right end of the first guide rod are respectively arranged at the left side and the right side of the inner cavity of the movable groove; the left end and the right end of the second guide rod are respectively arranged at the left side and the right side of the inner cavity of the first chute. The device can effectively detect the sealing performance of the piston seal, and can timely detect the condition of the reduction of the piston seal by comprehensively detecting and evaluating the sealing performance of the hydraulic cylinder, so that the oil leakage problem can be discovered and solved earlier, and meanwhile, the sealing performance of the hydraulic cylinder can be evaluated more accurately according to the pressure gauge and the instrument panel, so that the problem of unobvious observation effect is avoided.
Description
Technical Field
The invention relates to the technical field of hydraulic cylinder detection, in particular to a hydraulic cylinder tightness testing device and a testing method.
Background
Hydraulic cylinders are a commonly used power mechanical device, which can perform force transmission and action by applying pressure on a piston through liquid, are widely applied to the fields of industry, agriculture, construction and the like, and play an important role in a plurality of mechanical devices;
The tightness is very important for a hydraulic system, the working efficiency and the service life of the hydraulic cylinder are directly influenced, the good tightness can ensure that liquid in the hydraulic cylinder cannot leak or leak, and meanwhile, external impurities are prevented from entering the hydraulic cylinder to enable the hydraulic cylinder to normally operate, but the tightness of the hydraulic cylinder can be weakened when the conditions of ageing or damage of a piston sealing element, damage of the surface of a piston rod, improper installation or negligence of hydraulic cylinder components and the like occur, so that the tightness of the hydraulic cylinder needs to be detected by using a hydraulic cylinder tightness testing device;
However, when the traditional hydraulic cylinder tightness testing device is used, the leakage of the hydraulic cylinder can be detected, namely whether the hydraulic cylinder has oil leakage or not is detected, and the tightness of the piston seal cannot be detected, so that the condition of the reduced tightness of the piston is hardly perceived, and therefore, measures cannot be taken in time to repair or replace the piston seal;
Meanwhile, when the traditional hydraulic cylinder tightness testing device is used for detecting the tightness of the hydraulic cylinder, the hydraulic cylinder is usually required to be placed under water, and the tightness of the hydraulic cylinder is judged by observing whether the hydraulic cylinder bleeds or not, but the observation method has certain limitations, the observation effect is not obvious, the use is inconvenient, and especially when the hydraulic cylinder is large or the water quality is unclear, the observation result can produce misjudgment.
Disclosure of Invention
The invention aims to provide a hydraulic cylinder tightness testing device and a testing method, which are used for solving the problems that the use of the hydraulic cylinder tightness testing device is limited and is inconvenient to observe in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: the hydraulic cylinder tightness testing device comprises a main frame, wherein a moving groove communicated with an inner cavity of the main frame is formed in the middle of the top end of the main frame along the left-right direction, a first sliding groove is formed in the front and rear ends of the left side of the top end of the main frame along the left-right direction, and a second sliding groove is formed in the front and rear ends of the left side of the top end of the inner cavity of the main frame along the left-right direction; the left end and the right end of the first guide rod are respectively arranged at the left side and the right side of the inner cavity of the movable groove; the left end and the right end of the second guide rod are respectively arranged at the left side and the right side of the inner cavity of the first chute; the left end and the right end of the third guide rod are respectively arranged at the left side and the right side of the inner cavity of the second chute; the pressure detection mechanism is arranged in the inner cavity of the main frame; the first connecting block is arranged at the top end of the right side of the main frame; the number of the first sliding blocks is two, the two first sliding blocks are respectively and slidably matched and inserted on the right side of the inner cavity of the first sliding groove, and the first sliding blocks are slidably sleeved on the outer wall of the second guide rod; the front side and the rear side of the bottom end of the second connecting block are respectively arranged at the top ends of the two first sliding blocks, and the middle part of the bottom end of the second connecting block can slide to penetrate through the inner cavity of the moving groove and extend into the inner cavity of the main frame; the number of the bolts is two, and the two bolts are respectively and slidably inserted into the inner cavities of the first connecting block and the second connecting block; the nut is in threaded connection with the front side of the outer wall of the bolt; the left end and the right end of the hydraulic cylinder are respectively connected with the inner cavities of the first connecting block and the second connecting block in a sliding mode in a matching mode, and the left end and the right end of the hydraulic cylinder are respectively sleeved on the outer walls of the two bolts; the number of the connecting mechanisms is two, and the two connecting mechanisms are respectively and detachably arranged at the oil ports of the rodless cavity and the rod cavity of the hydraulic cylinder; the first oil pipe is arranged at the top end of the connecting mechanism positioned at the left side; the second oil pipe is arranged at the top end of the connecting mechanism positioned on the right side.
Preferably, in order to seal the oil port of the hydraulic cylinder, the connecting mechanism includes: the female connector is detachably arranged at an oil port of the hydraulic cylinder, and a clamping groove is formed in the top of the outer wall of the female connector along the circumferential direction; the pressure gauge is arranged at the bottom of the outer wall of the female connector; the first supporting plate is arranged at the top of the inner cavity of the female connector; the telescopic rod is slidably matched and inserted into the inner cavity of the first supporting plate; the first spring is sleeved at the top end of the outer wall of the telescopic rod, and the bottom end of the first spring is clamped at the top end of the first supporting plate; the end cap sets up in the top of telescopic link, and the top joint of first spring is in the bottom of end cap, and the external diameter of end cap and female connector's inner chamber top internal diameter phase-match.
Preferably, in order to communicate the inner cavity of the second oil pipe with the oil port of the hydraulic cylinder, the connection mechanism further includes: the male connector is matched and connected with the top end of the outer wall of the female connector in a sliding manner, a plurality of storage grooves communicated with the inner cavities of the male connector are formed in the bottom of the outer wall of the male connector at equal intervals along the circumferential direction, and the first oil pipe and the second oil pipe are respectively arranged at the top ends of the two male connectors; the baffle is arranged at the bottom of the outer wall of the male connector; the second supporting plate is arranged at the top of the inner cavity of the male connector; the push rod is arranged in the middle of the bottom end of the second supporting plate, the bottom end of the push rod extends into the inner cavity of the female connector, and the bottom end of the push rod is contacted with the top end of the plug and matched with the top end of the plug; the sleeve is slidably matched and inserted into the inner cavity of the male connector, the push rod is inserted into the inner cavity of the sleeve, a gap exists between the outer wall of the push rod and the inner wall of the sleeve, the outer diameter of the sleeve is matched with the inner diameter of the top end of the inner cavity of the female connector, and a convex block is arranged on the outer wall of the sleeve; the second spring is sleeved at the top of the outer wall of the sleeve, the top end of the second spring is clamped at the top end of the sleeve, and the bottom end of the second spring is clamped at the bottom end of the inner cavity of the male connector; the pushing barrel is slidably matched and inserted into the inner cavity of the male connector, the outer wall of the sleeve is slidably matched and inserted into the bottom end of the inner cavity of the pushing barrel, and the outer diameter of the pushing barrel is the same as the diameter of the top end of the female connector; the third spring is sleeved on the inner wall of the male connector, the top end of the third spring is clamped on the top end of the inner cavity of the push cylinder, and the bottom end of the third spring is clamped on the bottom end of the inner cavity of the male connector.
Preferably, in order to fixedly connect the female connector and the male connector, the connecting mechanism further comprises: the clamping ball is inserted into the inner cavity of the storage groove in a matching way, and is inserted into the inner cavity of the clamping groove in a matching way; the shielding cylinder is sleeved at the bottom end of the outer wall of the male connector in a sliding way, and the outer wall of the clamping ball is contacted with the inner wall of the shielding cylinder; the fourth spring cup joints in the outer wall of public connector, and the top joint of fourth spring is in the outer wall of public connector, and the bottom joint of fourth spring is in the inner chamber bottom of sheltering from a section of thick bamboo.
Preferably, in order to perform a dwell test on the hydraulic cylinder, the pressure detection mechanism includes: the second sliding block is slidably matched and inserted on the right side of the inner cavity of the second sliding groove, and is slidably sleeved on the outer wall of the third guide rod; the front side and the rear side of the top end of the supporting frame are respectively arranged at the bottom ends of the two second sliding blocks; the instrument panel is arranged at the left side of the bottom end of the supporting frame; the rear end of the rotating rod is rotatably arranged in the middle of the rear side of the inner cavity of the instrument panel through a bearing, and the front end of the rotating rod extends out of the front side of the instrument panel; the gear is sleeved on the outer wall of the rotary rod and locked by the jackscrew, and is positioned in the inner cavity of the instrument panel; the pointer is arranged at the front side of the outer wall of the rotating rod; the left side and the right side of the outer wall of the screw rod are respectively rotatably arranged on the left side and the right side of the inner cavity of the main frame through bearings, the right end of the screw rod extends out of the right side of the main frame, and the bottom end of the support frame is in threaded connection with the outer wall of the screw rod; the number of the pressure springs is two, and the right ends of the two pressure springs are respectively clamped at the front end and the rear end of the left side of the support frame; the left side of the rack is fixedly sleeved at the bottom end of the second connecting block, the front side and the rear side of the rack are respectively clamped at the left ends of the two pressure springs, and the rack is meshed with the gear.
Preferably, the length of the clamping ball extending into the inner cavity of the clamping groove is smaller than the radius of the clamping ball.
Preferably, the distance from the clamping ball to the position of the groove on the inner wall of the shielding cylinder is smaller than the distance from the top end of the shielding cylinder to the bottom end of the baffle.
The hydraulic cylinder tightness testing device and the hydraulic cylinder tightness testing method provided by the invention have the beneficial effects that:
1. According to the hydraulic cylinder, the two ends of the hydraulic cylinder can be respectively fixed in the inner cavities of the first connecting block and the second connecting block by using the bolts and the nuts, and the first oil pipe, the second oil pipe and the oil port of the hydraulic cylinder can be communicated by using the matching between the female connector and the male connector, so that hydraulic oil can be conveyed into the inner cavity of the hydraulic cylinder through the first oil pipe and the second oil pipe.
2. When the second connecting block is pushed to the hydraulic cylinder to move leftwards, the pressure spring can be used for applying a rightward pulling force to the second connecting block, so that a rightward pulling force is applied to a piston rod of the hydraulic cylinder, the time of pressure maintaining test can be shortened, the test effect is more obvious, and meanwhile, the tightness performance of the hydraulic cylinder can be more intuitively observed by utilizing the cooperation among the rack, the gear, the rotary rod, the pointer and the instrument panel.
3. The invention can effectively detect the sealing performance of the piston seal, and can timely detect the condition of the reduced sealing performance of the piston through comprehensive detection and evaluation of the sealing performance of the hydraulic cylinder, so that the oil leakage problem can be discovered and solved earlier, and meanwhile, the sealing performance of the hydraulic cylinder can be evaluated more accurately according to the pressure gauge and the instrument panel, thereby avoiding the problem of unobvious observation effect.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is an exploded view of the present invention;
FIG. 4 is a schematic view of the structure of the top end of the cavity of the main frame;
FIG. 5 is a schematic view of the structure of the connection mechanism in a separated state;
FIG. 6 is a front cross-sectional view of the connection mechanism in a disengaged state;
FIG. 7 is a front cross-sectional view of the connection mechanism;
FIG. 8 is a schematic view of the internal cavity structure of the male connector;
FIG. 9 is an enlarged view at A of FIG. 3;
FIG. 10 is an enlarged view of FIG. 3 at B;
FIG. 11 is an enlarged view at C of FIG. 6;
FIG. 12 is an enlarged view of FIG. 7 at D;
fig. 13 is an enlarged view at E of fig. 7.
In the figure: 1. a main frame; 2. a moving groove; 3. a first chute; 4. a second chute; 5. a first guide bar; 6. a second guide bar; 7. a third guide bar; 8. a connecting mechanism; 81. a female connector; 82. a pressure gauge; 83. a first support plate; 84. a telescopic rod; 85. a first spring; 86. a plug; 87. a male connector; 88. a storage tank; 89. a second support plate; 810. a push rod; 811. a sleeve; 8111. a bump; 812. a second spring; 813. pushing a cylinder; 814. a third spring; 815. ball clamping; 816. a clamping groove; 817. a shielding cylinder; 818. a fourth spring; 819. a baffle; 9. a pressure detection mechanism; 91. a second slider; 92. a support frame; 93. a dashboard; 94. a rotating rod; 95. a gear; 96. a pointer; 97. a screw; 98. a pressure spring; 99. a rack; 10. a first connection block; 11. a first slider; 12. a second connection block; 13. a bolt; 14. a nut; 15. a hydraulic cylinder; 16. a first oil pipe; 17. and a second oil pipe.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-13, the present invention provides a technical solution, a hydraulic cylinder tightness testing device, comprising: the main frame 1, the movable groove 2, the first sliding groove 3, the second sliding groove 4, the first guide rod 5, the second guide rod 6, the third guide rod 7, the connecting mechanism 8, the pressure detection mechanism 9, the first connecting block 10, the first sliding block 11, the second connecting block 12, the bolt 13, the nut 14, the hydraulic cylinder 15, the first oil pipe 16 and the second oil pipe 17, the movable groove 2 communicated with the inner cavity of the main frame 1 is arranged at the middle part of the top end of the main frame 1 along the left and right direction, the first sliding groove 3 is arranged at the front and back ends of the top end of the main frame 1 along the left and right direction, the second sliding groove 4 is arranged at the front and back ends of the top end of the inner cavity of the main frame 1 along the left and right direction, the left and right ends of the first guide rod 5 are respectively arranged at the left and right sides of the inner cavity of the movable groove 2, the left and right ends of the second guide rod 6 are respectively arranged at the left and right sides of the inner cavity of the first sliding groove 3, the left and right ends of the third guide rod 7 are respectively arranged at the left and right sides of the inner cavity of the second sliding groove 4, the pressure detection mechanism 9 is arranged in the inner cavity of the main frame 1, the pressure detection mechanism 9 is utilized to carry out pressure maintaining test on the hydraulic cylinder 15, the first connecting block 10 is arranged at the top end of the right side of the main frame 1, the number of the first sliding blocks 11 is two, the two first sliding blocks 11 are respectively and slidably matched and inserted at the right side of the inner cavity of the first sliding groove 3, the first sliding blocks 11 are slidably sleeved on the outer wall of the second guide rod 6, the front side and the rear side of the bottom end of the second connecting block 12 are respectively arranged at the top ends of the two first sliding blocks 11, the middle part of the bottom end of the second connecting block 12 slidably penetrates through the inner cavity of the movable groove 2 and extends into the inner cavity of the main frame 1, the number of the bolts 13 is two, the two bolts 13 are respectively and slidably inserted at the inner cavities of the first connecting block 10 and the second connecting block 12, the nuts 14 are in threaded connection with the front side of the outer wall of the bolts 13, the left end and the right end of the hydraulic cylinder 15 can be respectively fixed in the inner cavities of the first connecting block 10 and the second connecting block 12 by utilizing the cooperation between the bolts 13 and the nuts 14, the left end and the right end of the hydraulic cylinder 15 are respectively connected in the inner cavities of the first connecting block 10 and the second connecting block 12 in a sliding mode in an adapting mode, the left end and the right end of the hydraulic cylinder 15 are respectively sleeved on the outer walls of the two bolts 13, the hydraulic cylinder 15 is in the prior art, the number of the connecting mechanisms 8 is not repeated, the two connecting mechanisms 8 are respectively detachably arranged in the rodless cavity and the oil port with the rod cavity of the hydraulic cylinder 15, the connecting mechanisms 8 are used for communicating the first oil pipe 16, the second oil pipe 17 and the oil port of the hydraulic cylinder 15, the first oil pipe 16 is arranged at the top end of the connecting mechanism 8 positioned at the left side, and the second oil pipe 17 is arranged at the top end of the connecting mechanism 8 positioned at the right side.
Preferably, the connection mechanism 8 further includes: female connector 81, pressure gauge 82, first backup pad 83, telescopic link 84, first spring 85, end cap 86, male connector 87, storage tank 88, second backup pad 89, push rod 810, sleeve 811, second spring 812, push cylinder 813, third spring 814, card ball 815, card slot 816, shelter cylinder 817, fourth spring 818 and baffle 819, female connector 81 detachably sets up in the hydraulic fluid port of pneumatic cylinder 15, and the outer wall top of female connector 81 has offered card slot 816 along circumference, and pressure gauge 82 sets up in the outer wall bottom of female connector 81, the pressure gauge 82 is in the prior art, and is not described in detail herein, the pressure gauge 82 is used for reading the pressure in the inner cavity of the hydraulic cylinder 15, the first supporting plate 83 is arranged at the top of the inner cavity of the female connector 81, the telescopic rod 84 is slidably and adaptively inserted into the inner cavity of the first supporting plate 83, the first spring 85 is sleeved at the top end of the outer wall of the telescopic rod 84, the bottom end of the first spring 85 is clamped at the top end of the first supporting plate 83, the first spring 85 is a rotary spring and is elastically deformed after being extruded or stretched by external force, the external force is removed and then returns to an initial state, the first spring 85 is used for pushing the telescopic rod 84 to move upwards, the plug 86 is arranged at the top end of the telescopic rod 84, the top end of the first spring 85 is clamped at the bottom end of the plug 86, the outer diameter of the plug 86 is matched with the inner diameter of the top end of the inner cavity of the female connector 81, the plug 86 is used for sealing the inner cavity of the female connector 81, the male connector 87 is slidably matched and connected at the top end of the outer wall of the female connector 81, a plurality of storage grooves 88 communicated with the inner cavity of the male connector 87 are formed in the bottom of the outer wall of the male connector 87 at equal intervals along the circumferential direction, the first oil pipe 16 and the second oil pipe 17 are respectively arranged at the top ends of the two male connectors 87, the baffle 819 is arranged at the bottom of the outer wall of the male connector 87, the baffle 819 is used for shielding the shielding cylinder 817, the second support plate 89 is arranged at the top of the inner cavity of the male connector 87, the push rod 810 is arranged in the middle of the bottom end of the second supporting plate 89, the bottom end of the push rod 810 extends into the inner cavity of the female connector 81, the bottom end of the push rod 810 is contacted with the top end of the plug 86 and matched with the inner cavity of the sleeve 811, the sleeve 811 is slidably matched with and inserted into the inner cavity of the male connector 87, the push rod 810 is inserted into the inner cavity of the sleeve 811, a gap exists between the outer wall of the push rod 810 and the inner wall of the sleeve 811, the outer diameter of the sleeve 811 is matched with the inner diameter of the top end of the inner cavity of the female connector 81, the outer wall of the sleeve 811 is provided with a bump 8111, the sleeve 811 is used for conveying hydraulic oil, the second spring 812 is sleeved at the top of the outer wall of the sleeve 811, the top end of the second spring 812 is clamped at the top end of the sleeve 811, the bottom end of the second spring 812 is clamped at the bottom end of the inner cavity of the male connector 87, the second spring 812 is a rotary spring, elastic deformation occurs after the second spring 812 is extruded or stretched by external force, the second spring 812 is recovered to an initial state after the external force is removed, the second spring 812 is used for pulling the sleeve 811 to recover to the initial position, the sliding phase of the push cylinder 813 is inserted in the inner cavity of the male connector 87, the sliding phase of the outer wall of the sleeve 811 is inserted in the bottom end of the inner cavity of the push cylinder 813, the outer diameter of the push cylinder 813 is the same as the diameter of the top end of the female connector 81, the push cylinder 813 is used for pushing the sleeve 811 to move, the third spring 814 is sleeved on the inner wall of the male connector 87, the top end of the third spring 814 is clamped on the top end of the inner cavity of the push cylinder 813, the bottom end of the third spring 814 is clamped on the bottom end of the inner cavity of the male connector 87, the third spring 814 is a rotary spring and is elastically deformed after being extruded or stretched by external force, the external force is removed and returns to an initial state, the third spring 814 is used for pulling the push cylinder 813 to return to the initial position, the clamping ball 815 is matched and inserted in the inner cavity of the storage groove 88, the clamping ball 815 is matched and inserted in the inner cavity of the clamping groove 816, the female connector 81 and the male connector 87 can be fixedly connected together by utilizing the cooperation between the clamping ball 815 and the clamping groove 816, the length of the clamping ball 815 extending into the inner cavity of the clamping groove 816 is smaller than the radius of the clamping ball 815, so that the clamping ball 815 can be extruded out of the inner cavity of the clamping groove 816 by utilizing the inner wall of the clamping groove 816; the shielding cylinder 817 is slidably sleeved at the bottom end of the outer wall of the male connector 87, the outer wall of the clamping ball 815 is contacted with the inner wall of the shielding cylinder 817, the clamping ball 815 can be shielded by the shielding cylinder 817, the distance from the clamping ball 815 to the position of the groove on the inner wall of the shielding cylinder 817 is smaller than the distance from the top end of the shielding cylinder 817 to the bottom end of the baffle 819, the clamping ball 815 can be ensured to move into the inner cavity of the groove on the inner wall of the shielding cylinder 817, the fourth spring 818 is sleeved at the outer wall of the male connector 87, the top end of the fourth spring 818 is clamped at the outer wall of the male connector 87, the bottom end of the fourth spring 818 is clamped at the bottom end of the inner cavity of the shielding cylinder 817, the fourth spring 818 is a rotary spring, and is elastically deformed when being squeezed or stretched by an external force, and returns to an initial state after the external force is removed, and the fourth spring 818 is used for pushing the shielding cylinder 817 to return to an initial position.
As a preferred embodiment, the pressure detecting mechanism 9 includes: the second slide block 91, the supporting frame 92, the instrument panel 93, the rotary rod 94, the gear 95, the pointer 96, the screw 97, the pressure spring 98 and the rack 99, the second slide block 91 is slidably matched and inserted on the right side of the inner cavity of the second chute 4, the second slide block 91 is slidably sleeved on the outer wall of the third guide rod 7, the front side and the rear side of the top end of the supporting frame 92 are respectively arranged at the bottom ends of the two second slide blocks 91, the instrument panel 93 is arranged at the left side of the bottom end of the supporting frame 92, the rear end of the rotary rod 94 is rotatably arranged in the middle part of the inner cavity of the instrument panel 93 through a bearing, the front end of the rotary rod 94 extends out of the front side of the instrument panel 93, the gear 95 is sleeved on the outer wall of the rotary rod 94 and is locked through a jackscrew, the gear 95 is positioned in the inner cavity of the instrument panel 93, the pointer 96 is arranged at the front side of the outer wall of the rotary rod 94, the outer wall left and right sides of screw rod 97 are rotatable through the bearing setting in the inner chamber left and right sides of body frame 1 respectively, the right-hand member of screw rod 97 extends the right side of body frame 1, the bottom spiro union of support frame 92 is in the outer wall of screw rod 97, the quantity of pressure spring 98 is two, the right-hand member of two pressure springs 98 joint respectively in the left side front and back both ends of support frame 92, pressure spring 98 is rotatory spring, receive external force extrusion or elastic deformation takes place after tensile, the initial state is retrieved after the external force is got rid of, pressure spring 98 is used for exerting a pulling force to the right side to the piston rod of pneumatic cylinder 15 here, the left side of rack 99 is fixed cup joint in the bottom of second connecting block 12, the front and back both sides of rack 99 joint respectively in the left end of two pressure springs 98, rack 99 and gear 95 mesh mutually.
The hydraulic cylinder tightness testing device and the testing method concretely comprise the following steps:
When the hydraulic cylinder 15 is used, if the sealing performance of the piston of the hydraulic cylinder 15 is required to be tested, the female connector 81 and the male connector 87 positioned on the right side are urged to be separated, the shielding cylinder 817 is pulled upwards, the shielding cylinder 817 moves upwards to squeeze the fourth spring 818 to elastically deform until the shielding cylinder 817 moves to the position of the groove of the shielding cylinder 817 corresponding to the position of the clamping ball 815, the male connector 87 is pulled upwards, the clamping ball 815 is squeezed to move towards the inner cavity of the groove of the inner wall of the shielding cylinder 817 by utilizing the inner wall of the clamping groove 816 until the clamping ball 815 completely moves out of the inner cavity of the clamping groove 816, and the locking between the female connector 81 and the male connector 87 can be released, continuing to pull the male connector 87 upwards, the male connector 87 can drive the push rod 810 to move upwards, the push rod 810 can drive the first spring 85 to push the telescopic rod 84 to drive the plug 86 to move upwards, meanwhile, the male connector 87 can utilize the second spring 812 to pull the sleeve 811 to move downwards until the bottom end of the inner wall of the sleeve 811 contacts with the outer wall of the push rod 810, the male connector 87 can utilize the third spring 814 to pull the push cylinder 813 to move downwards until the push rod 87 and the bottom end of the male connector 87 are in the same horizontal plane, at the moment, the outer wall of the push cylinder 813 is utilized to shield the clamping ball 815, the blocking ball 815 is prevented from moving inwards, the position of the blocking cylinder 817 can be fixed by utilizing the cooperation among the storage groove 88, the inner wall groove of the blocking cylinder 817 and the blocking ball 815, the blocking cylinder 817 is prevented from being pushed to move downwards under the action of the elastic force of the fourth spring 818, at the moment, the bottom end of the push rod 810, the bottom end of the push cylinder 813 and the bottom end of the male connector 87 are positioned at the same horizontal plane, meanwhile, the plug 86 is adaptively inserted into the top end of the inner cavity of the female connector 81, the top end of the plug 86 and the top end of the female connector 81 are positioned at the same horizontal plane, and the female connector 81 and the male connector 87 can be separated, at the same time of separation, the inner cavity of the male connector 87 can be sealed by the push rod 810, the inner cavity of the female connector 81 is sealed by the plug 86, hydraulic oil leakage is prevented, at the moment, the right side oil port of the hydraulic cylinder 15, namely the oil port without a rod cavity, is in a sealed state, the left side oil port, namely the oil port with a rod cavity, is in a connected state, hydraulic oil is conveyed to the rod cavity of the hydraulic cylinder 15 through the first oil pipe 16, meanwhile, the pressure in the inner cavity with the rod cavity of the hydraulic cylinder 15 is read by the pressure gauge positioned at the left side, for example, the sealing effect of the piston of the hydraulic cylinder 15 is damaged, when hydraulic oil is conveyed to the rod cavity of the hydraulic cylinder 15, hydraulic oil in the inner cavity with the rod cavity of the hydraulic cylinder 15 can flow into the rod-free cavity of the hydraulic cylinder 15 through the sealing piece damaged by the piston, because the pressure receiving area of the piston in the rodless cavity is larger than that of the piston in the rod cavity, when the piston seal of the hydraulic cylinder 15 is damaged, the oil port of the rodless cavity is sealed, and when hydraulic oil is conveyed into the rod cavity of the hydraulic cylinder 15, the piston rod of the hydraulic cylinder 15 is pushed to move leftwards under the pressure of the hydraulic oil, if the piston seal is not damaged, when the hydraulic oil is conveyed into the cavity of the rod cavity, the pressure in the rod cavity is continuously increased, and then the pressure value can be read by utilizing the pressure gauge 82, so that whether the piston seal of the hydraulic cylinder 15 is damaged or not can be effectively distinguished;
Step two, if the piston seal is not damaged, when the piston rod seal and the shell seal of the hydraulic cylinder 15 are required to be tested, the male connector 87 positioned on the right side is inserted into the female connector 81, the positions of the push rod 810 and the plug 86 are correspondingly promoted, when the male connector 87 is inserted downwards, the top end of the female connector 81 is promoted to push the push cylinder 813 upwards, the third spring 814 is stretched to generate elastic deformation, simultaneously, the sleeve 811 and the bottom end of the push rod 810 are moved out of the inner cavity of the push cylinder 813, the plug 86 is promoted to move downwards by the push rod 810, the first spring 85 is extruded to generate elastic deformation, after the inner wall of the push cylinder 813 is contacted with the convex block 8111 on the outer wall of the sleeve 811, the push cylinder 813 can drive the sleeve 811 to move upwards, the second spring 812 is extruded to generate elastic deformation until the clamping ball 815 moves to correspond to the position of the clamping groove 816, the shielding cylinder 817 can be pushed downwards under the elastic force of the fourth spring 818, the inner wall of the groove of the shielding cylinder 817 is utilized to squeeze the clamping ball 815 to move towards the inner cavity of the clamping groove 816, the female connector 81 and the male connector 87 can be fixed by utilizing the cooperation between the clamping groove 816 and the clamping ball 815, hydraulic oil is conveyed to the rodless cavity of the hydraulic cylinder 15 through the second oil pipe 17, hydraulic oil in the inner cavity of the rod cavity of the hydraulic cylinder 15 is discharged through the first oil pipe 16, the hydraulic oil conveyed by the second oil pipe 17 flows into the rodless cavity of the hydraulic cylinder 15 through the inner cavity of the male connector 87, the inner cavity of the sleeve 811 and the inner cavity of the female connector 81, the piston rod of the hydraulic cylinder 15 is further promoted to move leftwards, the second connecting block 12 is pushed to move leftwards, the rack 99 can be driven to move leftwards, the rack 99 moves leftwards, the tension pressure spring 98 is elastically deformed, meanwhile, the gear 95 is driven to rotate the pointer 96 through the rotary rod 94, when the hydraulic cylinder 15 pushes the second connecting block 12 to move to a proper position, at the moment, the numerical value indicated by the pointer 96 on the instrument panel 93 is read, the numerical values on the two pressure gauges 82 are read, after pressure maintaining test is carried out for a period of time, the numerical value indicated by the pointer 96 on the instrument panel 93 and the numerical values on the two pressure gauges 82 are read again, if the indicated numerical values are reduced, the condition that the pressure in the inner cavity of the hydraulic cylinder 15 is reduced can be judged, and then the condition that the piston rod of the hydraulic cylinder is sealed or the shell is leaked can be known;
And thirdly, after the test is finished, the piston rod of the hydraulic cylinder 15 is restored to the initial position, the nut 14 is rotated until the nut 14 and the bolt 13 are separated, the bolt 13 is pulled out of the inner cavities of the first connecting block 10 and the second connecting block 12, and the fixation of the hydraulic cylinder 15 can be released, if the test is required, the screw 97 is rotated according to the length of the tested hydraulic cylinder 15, the support frame 92 is promoted to move left and right by the rotation force generated by the rotation of the screw 97, and meanwhile, the second connecting block 12 is slid to move along with the support frame 92 until the support frame 92 is moved to a proper position.
The device can effectively detect the sealing performance of the piston seal, and through comprehensive detection and evaluation of the sealing performance of the hydraulic cylinder 15, the situation of the reduction of the sealing performance of the piston can be timely perceived, so that the oil leakage problem can be discovered and solved earlier, meanwhile, the sealing performance of the hydraulic cylinder 15 can be evaluated more accurately according to the pressure gauge 82 and the instrument panel 93, and the problem of unobvious observation effect is avoided.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A hydraulic cylinder tightness testing device, comprising:
The novel sliding device comprises a main frame (1), wherein a moving groove (2) communicated with an inner cavity of the main frame (1) is formed in the middle of the top end of the main frame (1) along the left-right direction, a first sliding groove (3) is formed in the front and rear ends of the left side of the top end of the main frame (1) along the left-right direction, and a second sliding groove (4) is formed in the front and rear ends of the left side of the top end of the inner cavity of the main frame (1) along the left-right direction;
The left end and the right end of the first guide rod (5) are respectively arranged at the left side and the right side of the inner cavity of the movable groove (2);
the left end and the right end of the second guide rod (6) are respectively arranged at the left side and the right side of the inner cavity of the first chute (3);
The left end and the right end of the third guide rod (7) are respectively arranged at the left side and the right side of the inner cavity of the second chute (4);
The pressure detection mechanism (9) is arranged in the inner cavity of the main frame (1);
the first connecting block (10) is arranged at the top end of the right side of the main frame (1);
The two first sliding blocks (11) are respectively and slidably connected to the right side of the inner cavity of the first sliding groove (3) in an adaptive manner, and the first sliding blocks (11) are slidably connected to the outer wall of the second guide rod (6) in a sleeved mode;
the front side and the rear side of the bottom end of the second connecting block (12) are respectively arranged at the top ends of the two first sliding blocks (11), and the middle part of the bottom end of the second connecting block (12) can slide to penetrate through the inner cavity of the moving groove (2) and extend into the inner cavity of the main frame (1);
The number of the bolts (13) is two, and the two bolts (13) are respectively and slidably inserted into the inner cavities of the first connecting block (10) and the second connecting block (12);
the nut (14) is in threaded connection with the front side of the outer wall of the bolt (13);
The left end and the right end of the hydraulic cylinder (15) are respectively and slidably connected to the inner cavities of the first connecting block (10) and the second connecting block (12) in an adaptive manner, and the left end and the right end of the hydraulic cylinder (15) are respectively sleeved on the outer walls of the two bolts (13);
the hydraulic cylinder comprises two connecting mechanisms (8), wherein the two connecting mechanisms (8) are respectively and detachably arranged at the oil ports of a rodless cavity and a rod cavity of a hydraulic cylinder (15);
the first oil pipe (16) is arranged at the top end of the connecting mechanism (8) positioned at the left side;
the second oil pipe (17) is arranged at the top end of the connecting mechanism (8) positioned on the right side;
the connection mechanism (8) comprises:
the female connector (81), the detachable hydraulic port that sets up in pneumatic cylinder (15) of female connector (81), draw-in groove (816) have been seted up along circumference to the outer wall top of female connector (81);
the pressure gauge (82) is arranged at the bottom of the outer wall of the female connector (81);
the first supporting plate (83), the first supporting plate (83) is arranged at the top of the inner cavity of the female connector (81);
The telescopic rod (84) is slidably and adaptively inserted into the inner cavity of the first supporting plate (83);
the first spring (85) is sleeved at the top end of the outer wall of the telescopic rod (84), and the bottom end of the first spring (85) is clamped at the top end of the first supporting plate (83);
The plug (86), the plug (86) is arranged at the top end of the telescopic rod (84), the top end of the first spring (85) is clamped at the bottom end of the plug (86), and the outer diameter of the plug (86) is matched with the inner diameter of the top end of the inner cavity of the female connector (81);
The connection mechanism (8) further comprises:
the male connector (87), the slidable looks adaptation of male connector (87) connects in the outer wall top of female connector (81), the outer wall bottom of male connector (87) is offered along circumference equidistance and is linked together with a plurality of storage tanks (88) rather than the inner chamber, first oil pipe (16) and second oil pipe (17) set up in the top of two male connectors (87) respectively;
A baffle plate (819), the baffle plate (819) being arranged at the bottom of the outer wall of the male connector (87);
the second supporting plate (89), the said second supporting plate (89) is set up in the top of cavity of the male connector (87);
The push rod (810) is arranged in the middle of the bottom end of the second supporting plate (89), the bottom end of the push rod (810) extends into the inner cavity of the female connector (81), and the bottom end of the push rod (810) is in contact with the top end of the plug (86) and is matched with the top end of the plug;
The sleeve (811) is slidably and adaptively inserted into the inner cavity of the male connector (87), the push rod (810) is inserted into the inner cavity of the sleeve (811), a gap exists between the outer wall of the push rod (810) and the inner wall of the sleeve (811), the outer diameter of the sleeve (811) is matched with the inner diameter of the top end of the inner cavity of the female connector (81), and a bump (8111) is arranged on the outer wall of the sleeve (811);
The second spring (812), the second spring (812) is sleeved on the top of the outer wall of the sleeve (811), the top end of the second spring (812) is clamped on the top end of the sleeve (811), and the bottom end of the second spring (812) is clamped on the bottom end of the inner cavity of the male connector (87);
the pushing barrel (813), the slidable looks adaptation of pushing barrel (813) is pegged graft in the inner chamber of public connector (87), the slidable looks adaptation of the outer wall of sleeve (811) is pegged graft in the inner chamber bottom of pushing barrel (813), the external diameter of pushing barrel (813) is the same with the top diameter of female connector (81);
The third spring (814), the said third spring (814) is cup jointed to the inner wall of the male connector (87), the top of the said third spring (814) is clamped to the top of inner cavity of the push cylinder (813), the bottom of the said third spring (814) is clamped to the bottom of inner cavity of the male connector (87);
The clamping ball (815), the clamping ball (815) is in fit connection with the inner cavity of the storage groove (88), and the clamping ball (815) is in fit connection with the inner cavity of the clamping groove (816);
the shielding cylinder (817) is sleeved at the bottom end of the outer wall of the male connector (87) in a sliding manner, and the outer wall of the clamping ball (815) is contacted with the inner wall of the shielding cylinder (817);
The fourth spring (818), the said fourth spring (818) cup joints the outer wall in the male connector (87), the top of the said fourth spring (818) is snapped in the outer wall of the male connector (87), the bottom of the said fourth spring (818) is snapped in the bottom of inner chamber of the shielding cylinder (817);
The pressure detection mechanism (9) comprises:
The second sliding block (91) is slidably matched and inserted on the right side of the inner cavity of the second sliding groove (4), and the second sliding block (91) is slidably sleeved on the outer wall of the third guide rod (7);
the front side and the rear side of the top end of the supporting frame (92) are respectively arranged at the bottom ends of the two second sliding blocks (91);
The instrument panel (93), the instrument panel (93) is arranged at the left side of the bottom end of the supporting frame (92);
The rear end of the rotary rod (94) is rotatably arranged in the middle of the rear side of the inner cavity of the instrument panel (93) through a bearing, and the front end of the rotary rod (94) extends out of the front side of the instrument panel (93);
the gear (95) is sleeved on the outer wall of the rotary rod (94) and locked through a jackscrew, and the gear (95) is positioned in the inner cavity of the instrument panel (93);
a pointer (96), the pointer (96) being provided on the front side of the outer wall of the rotating lever (94);
The left side and the right side of the outer wall of the screw rod (97) are respectively rotatably arranged on the left side and the right side of the inner cavity of the main frame (1) through bearings, the right end of the screw rod (97) extends out of the right side of the main frame (1), and the bottom end of the supporting frame (92) is in threaded connection with the outer wall of the screw rod (97);
the two pressure springs (98) are arranged, and the right ends of the two pressure springs (98) are respectively clamped at the front end and the rear end of the left side of the support frame (92);
the left side of the rack (99) is fixedly sleeved at the bottom end of the second connecting block (12), the front side and the rear side of the rack (99) are respectively clamped at the left ends of the two pressure springs (98), and the rack (99) is meshed with the gear (95).
2. A hydraulic cylinder tightness testing device according to claim 1, wherein the length of the clamping ball (815) extending into the inner cavity of the clamping groove (816) is smaller than the radius thereof.
3. The hydraulic cylinder tightness testing device according to claim 2, wherein the distance from the clamping ball (815) to the groove position of the inner wall of the shielding cylinder (817) is smaller than the distance from the top end of the shielding cylinder (817) to the bottom end of the baffle plate (819).
4. A method of testing a cylinder tightness testing device according to claim 3, comprising the steps of:
Step one, when testing the sealing performance of the piston of the hydraulic cylinder (15), the female connector (81) and the male connector (87) positioned on the right side are promoted to be separated, the shielding cylinder (817) is pulled upwards, the shielding cylinder (817) moves upwards to squeeze the fourth spring (818) to generate elastic deformation until the shielding cylinder (817) moves to the position of the groove corresponding to the position of the clamping ball (815), the male connector (87) is pulled upwards, the clamping ball (815) is squeezed by the inner wall of the clamping groove (816) to move towards the inner cavity of the groove of the inner wall of the shielding cylinder (817) until the clamping ball (815) completely moves out of the inner cavity of the clamping groove (816), the locking between the female connector (81) and the male connector (87) can be released, the male connector (87) is continuously pulled upwards, the upward movement of the male connector (87) can drive the push rod (810) to move upwards, the upward movement of the push rod (810) can drive the first spring (85) to push the telescopic rod (84) to drive the plug (86) to move upwards, meanwhile, the upward movement of the male connector (87) can utilize the second spring (812) to pull the sleeve (811) to move downwards until the bottom end of the inner wall of the sleeve (811) is contacted with the outer wall of the push rod (810), the upward movement of the male connector (87) can utilize the third spring (814) to pull the push cylinder (813) to move downwards, until the locking ball (815) is moved to the same horizontal plane with the bottom end of the male connector (87), at the moment, the outer wall of the push cylinder (813) is used for shielding the locking ball (815) to prevent the locking ball (815) from moving inwards, the position of the shielding cylinder (817) can be fixed by utilizing the cooperation among the storage groove (88), the inner wall groove of the shielding cylinder (817) and the locking ball (815), the shielding cylinder (817) is prevented from being pushed to move downwards under the action of the elasticity of the fourth spring (818), at the moment, the bottom end of the push rod (810), the bottom end of the push cylinder (813) and the bottom end of the male connector (87) are positioned at the same horizontal plane, simultaneously, the plug (86) is inserted into the top end of the inner cavity of the female connector (81) in an adapting way, the top end of the plug (86) and the top end of the female connector (81) are positioned on the same horizontal plane, so that the female connector (81) and the male connector (87) can be separated, the inner cavity of the male connector (87) can be sealed by utilizing the push rod (810) while the plug (86) is utilized to seal the inner cavity of the female connector (81) to prevent hydraulic oil leakage, at the moment, the right side oil port of the hydraulic cylinder (15), namely the oil port without a rod cavity, is in a sealing state, the left side oil port, namely the oil port with a rod cavity, is in a connecting state, hydraulic oil is conveyed to the rod cavity of the hydraulic cylinder (15) through the first oil pipe (16), meanwhile, the pressure in the rod cavity inner cavity of the hydraulic cylinder (15) is read by utilizing the pressure gauge positioned at the left side, for example, the sealing effect of the piston of the hydraulic cylinder (15) is damaged, when hydraulic oil is conveyed to the rod cavity inner cavity of the hydraulic cylinder (15), the hydraulic oil in the rod cavity inner cavity of the hydraulic cylinder (15) can flow into the rodless cavity of the hydraulic cylinder (15) through the sealing piece damaged by the piston, and the pressure receiving area of the piston in the rodless cavity is larger than that of the piston in the rod cavity, so when the piston of the hydraulic cylinder (15) is damaged, the oil port of the rodless cavity is sealed, and when the hydraulic oil is conveyed to the rod cavity inner cavity of the hydraulic cylinder (15), the piston rod of the hydraulic cylinder (15) can be pushed to move leftwards under the pressure of the hydraulic oil, if the piston seal is not damaged, when hydraulic oil is conveyed to the inner cavity of the rod cavity, the pressure in the rod cavity is continuously increased, and then the pressure value can be read by using the pressure gauge (82), so that whether the piston seal of the hydraulic cylinder (15) is damaged or not can be effectively distinguished;
step two, if piston sealing is not damaged, when piston sealing performance and shell sealing performance of the hydraulic cylinder (15) are required to be tested, inserting a male connector (87) positioned on the right side into a female connector (81), enabling the push rod (810) to correspond to the position of a plug (86), enabling the top end of the female connector (81) to push a push cylinder (813) to move upwards, stretching a third spring (814) to elastically deform, simultaneously enabling the sleeve (811) and the push rod (810) to move towards the inner cavity of the female connector (81), pushing the plug (86) to move downwards by utilizing the push rod (810), extruding the first spring (85) to elastically deform, enabling the push cylinder (813) to drive the sleeve (811) to move upwards after the inner wall of the push cylinder (813) contacts with the outer wall of the sleeve (811), extruding the second spring (812) to elastically deform until the clamping ball (815) moves to correspond to the position of the clamping groove (816), enabling the push cylinder (817) to move downwards under the elastic force of the fourth spring (818), enabling the clamping ball (816) to be blocked downwards, extruding the inner wall of the clamping cylinder (816) to move towards the inner cavity of the clamping groove (816) by utilizing the inner wall of the clamping cylinder (816) to be matched with the inner wall of the clamping ball (816) of the female connector (81), the hydraulic oil is conveyed to the rodless cavity of the hydraulic cylinder (15) through the second oil pipe (17), the hydraulic oil in the rod cavity of the hydraulic cylinder (15) is discharged through the first oil pipe (16), the hydraulic oil conveyed by the second oil pipe (17) flows into the rodless cavity of the hydraulic cylinder (15) through the cavity of the male connector (87), the cavity of the sleeve (811) and the cavity of the female connector (81), the piston rod of the hydraulic cylinder (15) is further driven to move leftwards, the second connecting block (12) is driven to move leftwards, the rack (99) can be driven to move leftwards, the rack (99) is driven to move leftwards to pull the pressure spring (98) to elastically deform, meanwhile, the gear (95) is driven to rotate through the rotating rod (94), the hydraulic cylinder (15) is driven to move to a proper position, at the moment, the numerical values indicated on the two pressure gauges (82) by the pointer (96) are read, after one-end testing time is carried out, the numerical values indicated on the two pressure gauges (82) are read again, the numerical values indicated by the pointer (96) on the two pressure gauges (93) are reduced, and the numerical values indicated by the two pressure gauges (82) are judged to be small, namely the numerical values indicated by the hydraulic cylinder (93) are reduced, and then the situation that the piston rod of the hydraulic cylinder is sealed or the shell is leaked can be known;
And thirdly, after the test is finished, the piston rod of the hydraulic cylinder (15) is restored to the initial position, the nut (14) is rotated until the nut (14) is separated from the bolt (13), the bolt (13) is pulled out of the inner cavities of the first connecting block (10) and the second connecting block (12), the fixation of the hydraulic cylinder (15) can be released, and if the test is required, the screw (97) is rotated according to the length of the tested hydraulic cylinder (15), and the support frame (92) is urged to move left and right by the rotation force generated by the rotation of the screw (97), and meanwhile the second connecting block (12) is slid to move along with the support frame (92) until the support frame (92) moves to a proper position.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215414218U (en) * | 2021-08-12 | 2022-01-04 | 山东通用液压机械有限公司 | Air tightness detection device for hydraulic cylinder |
| CN217716810U (en) * | 2022-05-19 | 2022-11-01 | 河南宏源液压机械制造有限公司 | Airtightness detection device for hydraulic cylinder |
| CN116858443A (en) * | 2023-09-05 | 2023-10-10 | 浩立机械(烟台)有限公司 | Hydraulic cylinder tightness testing device |
| CN116878754A (en) * | 2023-06-05 | 2023-10-13 | 济源市丰泽特钢实业有限公司 | Air tightness detection device and detection method for cylinder barrel of hydraulic cylinder |
| CN116989955A (en) * | 2023-09-26 | 2023-11-03 | 山东宇飞传动技术有限公司 | Hydraulic cylinder tightness detection device based on fluid detection |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215414218U (en) * | 2021-08-12 | 2022-01-04 | 山东通用液压机械有限公司 | Air tightness detection device for hydraulic cylinder |
| CN217716810U (en) * | 2022-05-19 | 2022-11-01 | 河南宏源液压机械制造有限公司 | Airtightness detection device for hydraulic cylinder |
| CN116878754A (en) * | 2023-06-05 | 2023-10-13 | 济源市丰泽特钢实业有限公司 | Air tightness detection device and detection method for cylinder barrel of hydraulic cylinder |
| CN116858443A (en) * | 2023-09-05 | 2023-10-10 | 浩立机械(烟台)有限公司 | Hydraulic cylinder tightness testing device |
| CN116989955A (en) * | 2023-09-26 | 2023-11-03 | 山东宇飞传动技术有限公司 | Hydraulic cylinder tightness detection device based on fluid detection |
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