CN114754946B - New energy automobile turns to motor housing gas tightness testing arrangement - Google Patents
New energy automobile turns to motor housing gas tightness testing arrangement Download PDFInfo
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- CN114754946B CN114754946B CN202210490825.0A CN202210490825A CN114754946B CN 114754946 B CN114754946 B CN 114754946B CN 202210490825 A CN202210490825 A CN 202210490825A CN 114754946 B CN114754946 B CN 114754946B
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- 238000012360 testing method Methods 0.000 title claims abstract description 57
- 238000003825 pressing Methods 0.000 claims abstract description 51
- 238000007789 sealing Methods 0.000 claims description 73
- 238000001125 extrusion Methods 0.000 claims description 34
- 239000007921 spray Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 8
- 238000010168 coupling process Methods 0.000 claims 8
- 238000005859 coupling reaction Methods 0.000 claims 8
- 239000000758 substrate Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000000889 atomisation Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000013013 elastic material Substances 0.000 description 3
- 208000002925 dental caries Diseases 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- Examining Or Testing Airtightness (AREA)
Abstract
The invention belongs to the technical field of new energy automobiles, in particular to a new energy automobile steering motor shell air tightness testing device which comprises a pressing piece and an inflatable base; the lower pressing piece comprises a cylinder, a lower pressing plate, a supporting plate, an air cylinder and a guide rod; one ends of four guide rods are fixedly connected to the four right-angle positions of the supporting plate respectively, an air cylinder is fixedly connected to the supporting plate, the output end of the air cylinder points to the other end of the guide rod, and the output end of the air cylinder is fixedly connected with a lower pressing plate; through this gas tightness testing device, detect every work piece gas tightness that waits to detect one by one, guarantee to leave the factory and be qualified product for it can guarantee to turn to the motor normal and long-time operation when putting into use, and this gas tightness testing device is semi-automatization mode, compares purely manual test, and is effectual, and this gas tightness testing device moreover, simple structure, the simple operation.
Description
Technical Field
The invention belongs to the technical field of new energy automobiles, and particularly relates to a new energy automobile steering motor shell air tightness testing device.
Background
The new energy automobile has remarkable effects in reducing the air pollution degree and relieving the energy shortage, and under the environment of low carbon and environment protection advocated worldwide at present, the new energy automobile industry becomes the main direction of the development of the future automobile industry, and the oil price is continuously and greatly increased, so that more and more common people are willing to select the new energy automobile.
In the automobile parts, a plurality of parts have high requirement on air tightness, so the air tightness is required to be detected before delivery, the air tightness detection is an important procedure for ensuring the product quality and the production safety, and the effect of the air tightness detection in the production process is widely accepted;
the steering motor is used as one of the accessories of the new energy automobile and used for assisting a driver in rotating the steering wheel, so that the operation intensity of the driver in rotating the steering wheel is reduced, and various accessories are needed for the steering motor, wherein a steering motor shell is used as one of the main accessories of the steering motor, and after the steering motor shell is produced and processed, the steering motor shell is required to be subjected to an air tightness test, so that the steering motor shell can stably and stably run for a long time in use; the steering motor shell of the new energy automobile is not suitable for the existing air tightness testing device due to the shape factors, and the air tightness accuracy is difficult to guarantee through manual operation testing with high flexibility, and the efficiency is low, so that the air tightness testing device is used as one of important accessories on the automobile, and the control quality is required to be strictly controlled, so that the safe and stable operation of the new energy automobile is guaranteed.
Therefore, the invention provides the air tightness testing device for the steering motor shell of the new energy automobile.
Disclosure of Invention
In order to overcome the deficiencies of the prior art, at least one technical problem presented in the background art is solved.
The technical scheme adopted for solving the technical problems is as follows: the invention relates to a new energy automobile steering motor shell air tightness testing device which comprises a pressing piece and an inflatable base; the lower pressing piece comprises a cylinder, a lower pressing plate, a supporting plate, an air cylinder and a guide rod; the four right-angle positions of the supporting plate are fixedly connected with one end of four guide rods respectively, an air cylinder is fixedly connected on the supporting plate, the output end of the air cylinder points to the other end of the guide rod, the output end of the air cylinder is fixedly connected with a lower pressing plate, the four right-angle positions of the lower pressing plate are in sliding connection with the guide rods, the lower surface of the lower pressing plate is fixedly connected with one end of a cylinder, a ring-shaped sealing gasket is arranged in the cylinder, an inflatable base is arranged below the cylinder, the four right-angle positions of the inflatable base are fixedly connected with the other end of the guide rod, a groove is formed in the inflatable base, a limit column is arranged in the groove, a rubber pad is arranged at the inner edge of the groove, the inner space of the groove is used for placing a workpiece to be detected, an air passage is formed in the inflatable base, the air outlet end of the air passage penetrates through the surface of the groove, the air inlet end of the air passage is communicated with an air inlet pipe at one side of the inflatable base, and the air inlet pipe is communicated with an external air supply pump; the method comprises the steps that a to-be-detected workpiece is a new energy automobile steering motor shell, the to-be-detected workpiece is sleeved on a limit column, the lower surface of the to-be-detected workpiece is located in a groove, then a cylinder is driven to push down a lower pressing plate, a cylinder cover on the lower pressing plate covers the upper end of the to-be-detected workpiece, meanwhile, the upper part of the to-be-detected workpiece is propped against a sealing gasket, the lower surface of the to-be-detected workpiece is extruded on a rubber gasket, at the moment, quantitative gas is blown into an air inlet pipe through an air supply pump, at the moment, a pressure gauge on the air inlet pipe displays a numerical value, the current situation is maintained, whether the numerical value of the pressure gauge is reduced is observed, if the numerical value is reduced, the fact that the to-be-detected workpiece has a gas leakage position point at the moment is indicated that the to-be-detected workpiece is cast with flaws, and the to-be-detected workpiece cannot be put into use is indicated; through this gas tightness testing device, detect every work piece gas tightness that waits to detect one by one, guarantee to leave the factory and be qualified product for it can guarantee to turn to the motor normal and long-time operation when putting into use, and this gas tightness testing device is semi-automatization mode, compares purely manual test, and is effectual, and this gas tightness testing device moreover, simple structure, the simple operation.
Preferably, the sealing gasket comprises a round platform part and a base body; the inner top surface of the base body is provided with a first step groove, the inner top surface of the first step groove is provided with a second step groove, the middle position in the inner top surface of the second step groove is fixedly connected with a round platform part, the large end surface of the round platform part is fixedly connected with the inner top of the second step groove, and the small end surface of the round platform part is embedded into the upper port of the workpiece to be detected; the upper end face of the workpiece to be detected is in a step shape, the cylinder is pressed down after the workpiece to be detected is placed on the inflatable base, the cylinder cover covers the upper end of the workpiece to be detected, the upper end of the workpiece to be detected is embedded into an annular gap between the second step groove and the round platform part, meanwhile, the cylinder part is embedded into an upper port of the workpiece to be detected, at the moment, the upper end of the workpiece to be detected is blocked, namely, the upper end of the workpiece to be detected is sealed, and meanwhile, the first platform of the upper end of the workpiece to be detected is blocked through the round platform part, and the base body and the round platform part are matched, so that the sealing property between the sealing gasket and the workpiece to be detected is improved, and the air tightness is more accurate when the air tightness is tested through inflation.
Preferably, the outer edge of the inner top surface of the first step groove is provided with an extrusion bag; a first cavity is formed in the round platform part, a second cavity in a ring shape is formed in the large end face wall of the round platform part, and the second cavity is communicated with the extrusion bag through a pipeline; the second platform of waiting to detect the work piece upper end, the second platform is located the below of first platform, and the second platform extrudees the extrusion bag, and gas in the extrusion bag is through pipeline input to two cavitys in simultaneously, and two cavitys obtain gas two inflation to extrude on waiting to detect the work piece upper port inside wall, improve the leakproofness between round platform portion outer lane and the work piece upper port of waiting to detect, thereby improve the gas tightness.
Preferably, a jacking column is arranged at the lower end of the round platform part, one end of the jacking column is exposed at the lower end of the round platform part, the other end of the jacking column is arranged in the first cavity, a disc is arranged at the propped other end, the disc is in a pot cover shape, the bulge surface of the disc faces downwards, and the edge of the disc is fixedly connected at an inclined part in the round platform part; after the round platform part stretches into the upper port of the workpiece to be detected, the jack-prop at the lower end of the round platform part is propped against the limit post, the jack-prop moves upwards and pushes the disc, the disc is made of PVC elastic materials, the edge of the disc is supported towards the outer ring, the inclined part of the round platform part is propped outwards and extruded on the inner side wall of the upper port of the workpiece to be detected, more surfaces of the round platform part are in contact with the workpiece to be detected, the shape of the round platform part is set, the upper port of the workpiece to be detected is conveniently inserted into the round platform part, and more areas of the round platform part are in contact with the workpiece to be detected, so that the air tightness is improved, and the test result is more accurate.
Preferably, the upper surface of the disc is provided with a plurality of ejector rods which are in a circumferential array, one end of each ejector rod is fixedly connected to the eccentric position of the upper surface of the disc, and the other end of each ejector rod is fixedly connected to the side wall of the first cavity and is arranged close to the inner bottom surface of the second cavity; the upper surface indent of disc goes up gradually to the ejector pin is gone up in the slope, and the other end extrusion No. two cavity lateral walls positions of ejector pin plays the restriction effect to No. two cavity swell deformation trends, makes No. two cavity lower part positions swell the back, and the extrusion force to the ejector pin of swell, reaction is No. two cavities, makes round platform portion intermediate position still can closely attach on the port inside wall on waiting to detect the work piece, improves sealed pad and waiting to detect the leakproofness between the work piece.
Preferably, a plurality of extrusion grooves are formed in the edge position of the inner face of the substrate; the inner side wall of the lower end of the cylinder is provided with a plurality of placing grooves, the positions of the placing grooves correspond to the extrusion grooves one by one, an atomizing nozzle is arranged in the placing grooves, and an oil supply unit is arranged between the atomizing nozzle and the extrusion grooves; the oil supply unit comprises a piston rod, a piston cylinder, an oil inlet pipe and an oil outlet pipe; one end of the piston rod is fixedly connected to the inner bottom surface of the extrusion groove, the other end of the piston rod is hermetically and slidably connected in the piston cylinder, the piston cylinder is fixedly connected to the inner bottom surface of the extrusion groove, an oil inlet pipe and an oil outlet pipe are fixedly connected to the piston cylinder, the oil inlet pipe is positioned above the oil outlet pipe, the oil inlet pipe is communicated with an external oil drum, the oil outlet pipe is arranged along the inner side wall of the cylinder and is communicated with the atomization nozzle, and the spraying direction of the atomization nozzle is obliquely upwards arranged; the second platform at the upper end of the workpiece to be detected extrudes the matrix, the matrix extrudes the piston rod upwards, the inner space of the piston rod is large, the negative pressure is increased, and external sealing oil is pumped into the piston cylinder through the oil inlet pipe, when the workpiece to be detected breaks away from the sealing gasket, the matrix elastically restores to an initial state by the matrix, meanwhile, the piston rod is pulled down, the sealing oil in the piston head cylinder is extruded along the oil outlet pipe by the piston rod, and is sprayed out of the atomizing nozzle, the sealing oil is sprayed on the surface of the round platform part, when the workpiece to be detected is placed next, the round platform part is embedded into the upper port of the workpiece to be detected, the sealing oil is smeared in the upper port of the workpiece to be detected, a layer of sealing oil film is formed between the outer side wall of the round platform part and the inner side wall of the upper port of the workpiece to be detected, the sealing property between the round platform part and the workpiece to be detected is improved again, and the air tightness testing accuracy is improved.
Preferably, a plurality of semicircular grooves are formed in the lower half inclined surface of the round platform part, hook-shaped rubber tentacles are arranged in the semicircular grooves, the straight ends of the rubber tentacles are fixedly connected to the lower edge positions of the semicircular grooves, hooks of the rubber tentacles are arranged upwards, and concave points are arranged in the inner concave surfaces of the hook parts; the method comprises the steps that sealing oil is sprayed on the surface of a round platform part, if a workpiece to be detected cannot be placed on an inflatable base in time, the sealing oil flows downwards along the surface of the round platform part, the sealing oil flows on the inflatable base, firstly, the sealing oil pollutes the working environment, secondly, after the workpiece to be detected is placed, a sealing ring on the surface of the round platform part is dripped, and the sealing oil cannot form oil film sealing; and through setting up semicircle groove and rubber tentacle for partial seal oil remains the post of keeping, and seal oil trickles in semicircle inslot, and in the rubber tentacle, when making next waiting to detect the work piece and carrying out the gas tightness test, can stably remain sufficient seal oil on the round platform portion, and be provided with the pit in the interior concave surface at hook position, make the rubber tentacle can hold more seal oil, benefit from the shaping of seal oil film.
Preferably, the inner bottom surface of the groove is provided with a plurality of concave parts, a buffer air bag is arranged in the concave parts, the buffer air bag is a closed type bag body, and the buffer air bag is in clearance fit in the concave parts; through setting up buffer air bag, when placing the work piece of waiting to detect, wait to detect the work piece in advance and be withstood by buffer air bag, leave the clearance between waiting to detect work piece and the recess, prevent to wait to detect the work piece lower surface and collide with the recess interior bottom surface, cause the damage of waiting to detect the work piece surface to and buffer air bag clearance fit is in the concave part, when pressing down waiting to detect the work piece, wait to detect the work piece and push down buffer air bag, buffer air bag compression to the concave part, make the recess internal surface smooth and level, do not have the protruding thing to prop up and wait to detect the work piece bottom surface, guarantee the leakproofness between waiting to detect work piece lower surface and the recess.
Preferably, an auxiliary pressing rod is fixedly connected to the lower surface of the pressing plate, one end of the auxiliary pressing rod is fixedly connected to the pressing plate, the other end of the auxiliary pressing rod points to the groove, and the auxiliary pressing rod is positioned on one side of the cylinder; by arranging the auxiliary pressing rod, the workpiece to be detected is integrally pressed down, so that the workpiece to be detected is wholly pressed and balanced, the deformation of the workpiece to be detected after being pressed is reduced, and the quality of the workpiece to be detected is ensured.
Preferably, the lower end of the auxiliary pressing rod is fixedly connected with a PVC block, and the lower end surface of the cylinder is fixedly connected with a PVC circular ring; the PVC block and the PVC circular ring are arranged, so that firstly, the surface of the workpiece to be detected is prevented from being mistakenly touched against the cylinder or the auxiliary pressing rod when being placed, the surface of the workpiece to be detected is damaged, secondly, the surface of the workpiece to be detected is prevented from being pressed out of the cylinder or the auxiliary pressing rod, the surface of the workpiece to be detected is prevented from being damaged, and the function of buffering and protecting the workpiece to be detected is achieved.
The beneficial effects of the invention are as follows:
1. according to the air tightness testing device for the steering motor shell of the new energy automobile, the air tightness of each workpiece to be detected is detected one by one through the air tightness testing device, so that the delivery of the new energy automobile is guaranteed to be qualified, the steering motor can be guaranteed to normally operate for a long time when the new energy automobile is put into use, the air tightness testing device is in a semi-automatic mode, and compared with a pure manual test, the air tightness testing device is high in effect, simple in structure and convenient to operate.
2. According to the new energy automobile steering motor shell air tightness testing device, the sealing property between the sealing gasket and the workpiece to be detected is improved through the matching between the base body and the round table part, so that the air tightness is tested more accurately during inflation, and the second platform at the upper end of the workpiece to be detected is positioned below the first platform and extrudes the extrusion bag, meanwhile, gas in the extrusion bag is input into the second cavity through the pipeline, and the gas in the second cavity is expanded and extruded on the inner side wall of the upper port of the workpiece to be detected, so that the sealing property between the outer ring of the round table part and the upper port of the workpiece to be detected is improved, and the air tightness is improved.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a perspective view of a testing device of the present invention;
FIG. 2 is a diagram showing the cooperation of the lower platen and the workpiece to be inspected in the present invention;
FIG. 3 is a cross-sectional view of a cylinder of the present invention;
FIG. 4 is a diagram showing the fit of a rubber tentacle with a half slot in accordance with the present invention;
FIG. 5 is a perspective view of a workpiece to be inspected in accordance with the present invention;
FIG. 6 is a cross-sectional view of an inflatable seat of the present invention;
FIG. 7 is a diagram showing the cooperation of the PVC block and the auxiliary pressing rod, and the PVC ring and the cylinder;
in the figure: the device comprises a hold-down piece 1, an inflatable base 2, a workpiece to be detected 3, a cylinder 4, a hold-down plate 5, a supporting plate 6, an air cylinder 7, a guide rod 8, a sealing pad 9, a groove 10, a limit post 11, a rubber pad 12, an air passage 13, an air inlet pipe 14, a round platform 15, a base 16, a first step groove 17, a second step groove 18, an annular gap 19, a first platform 20, a squeeze bag 21, a first cavity 22, a second cavity 23, a pipeline 24, a second platform 25, a jacking post 26, a disc 27, a jacking rod 28, a squeeze groove 29, a placing groove 30, an atomization nozzle 31, a piston rod 32, a piston cylinder 33, an oil inlet pipe 34, an oil outlet pipe 35, a semicircular groove 36, a rubber tentacle 37, a concave point 38, a concave part 381, a buffer air bag 39, an auxiliary hold-down rod 40, a PVC block 41 and a PVC circular ring 42.
Detailed Description
The invention is further described in connection with the following detailed description in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
Embodiment one:
referring to fig. 1 and 6, a new energy automobile steering motor housing air tightness test device, the air tightness test device
The tightness testing device is used for detecting the air tightness of the workpiece 3 to be detected, namely the steering motor shell of the new energy automobile, and specifically comprises a hold-down piece 1 and an inflatable base 2; the hold-down piece 1 comprises a cylinder 4, a hold-down plate 5, a support plate 6, an air cylinder 7 and a guide rod 8; the four right-angle positions of the supporting plate 6 are fixedly connected with one end of four guide rods 8 respectively, an air cylinder 7 is fixedly connected on the supporting plate 6, the output end of the air cylinder 7 points to the other end of the guide rods 8, the output end of the air cylinder 7 is fixedly connected with a lower pressing plate 5, the four right-angle positions of the lower pressing plate 5 are slidably connected with the guide rods 8, the lower surface of the lower pressing plate 5 is fixedly connected with one end of a cylinder 4, a ring-shaped sealing gasket 9 is arranged in the cylinder 4, an inflatable base 2 is arranged below the cylinder 4, the four right-angle positions of the inflatable base 2 are fixedly connected with the other end of the guide rods 8, a groove 10 is formed in the inflatable base 2, a limit post 11 is arranged in the groove 10, a rubber pad 12 is arranged at the inner edge of the groove 10, a to-be-detected workpiece 3 is placed in the inner space of the groove 10, an air channel 13 is formed in the inflatable base 2, the air outlet end of the air channel 13 penetrates to the surface of the groove 10, the air inlet pipe 14 is communicated with one side of the inflatable base 2, and the air inlet pipe 14 is communicated with an external air supply pump; the workpiece 3 to be detected is a new energy automobile steering motor shell, the workpiece 3 to be detected is sleeved on a limit column 11, the lower surface of the workpiece 3 to be detected is located in a groove 10, then a cylinder 7 is driven, the cylinder 7 pushes down a lower pressing plate 5, a cylinder 4 on the lower pressing plate 5 covers the upper end of the workpiece 3 to be detected, meanwhile, the upper surface of the workpiece 3 to be detected is propped against a sealing gasket 9, the lower surface of the workpiece 3 to be detected is extruded on a rubber gasket 12, a quantitative gas is blown into an air inlet pipe 14 through an air supply pump, a pressure gauge on the air inlet pipe 14 displays a numerical value at the moment, the current situation is maintained, whether the numerical value of the pressure gauge is reduced or not is observed, if the numerical value is reduced, the condition that the workpiece 3 to be detected has a gas leakage position point at the moment is indicated, and the new energy automobile steering workpiece 3 to be detected is cast with flaws and cannot be put into use; through this gas tightness testing device, detect every work piece 3 gas tightness that waits to detect one by one, guarantee to leave the factory and be qualified product for it can guarantee to turn to the motor normal and long-time operation when putting into use, and this gas tightness testing device is semi-automatization mode, compares purely manual test, and is effectual, and this gas tightness testing device moreover, simple structure, the simple operation.
Referring to fig. 3 and 5, the gasket 9 includes a truncated cone 15 and a base 16; the inner top surface of the base body 16 is provided with a first step groove 17, the inner top surface of the first step groove 17 is provided with a second step groove 18, the middle position in the inner top surface of the second step groove 18 is fixedly connected with a round platform part 15, the large end surface of the round platform part 15 is fixedly connected with the inner top of the second step groove 18, and the small end surface of the round platform part 15 is embedded into the upper port of the workpiece 3 to be detected; the upper end face of the workpiece 3 to be detected is stepped, after the workpiece 3 to be detected is placed on the inflatable base 2, the cylinder 4 is pressed down, the cylinder 4 covers the upper end of the workpiece 3 to be detected, the upper end of the workpiece 3 to be detected is embedded into the annular gap 19 between the second stepped groove 18 and the round table portion 15, meanwhile, the cylinder 4 is embedded into the upper port of the workpiece 3 to be detected, at the moment, the upper end of the workpiece 3 to be detected is blocked, namely, the upper end of the workpiece 3 to be detected is sealed, meanwhile, the first platform 20 of the upper end of the workpiece 3 to be detected is blocked through the round table portion 15, and the base 16 and the round table portion 15 are matched, so that the sealing performance between the sealing gasket 9 and the workpiece 3 to be detected is improved, and the air tightness test is more accurate.
Referring to fig. 3 and 5, the inner top surface and the outer edge of the first step groove 17 are provided with squeeze bags 21; a first cavity 22 is formed in the round platform part 15, a second cavity 23 in a ring shape is formed in the large end face wall of the round platform part 15, and the second cavity 23 is communicated with the extrusion bag 21 through a pipeline 24; the second platform 25 of waiting to detect work piece 3 upper end, second platform 25 are located the below of first platform 20, and second platform 25 extrudees the extrusion bag 21, and the gas in the extrusion bag 21 is input into two cavities through pipeline 24 simultaneously, and No. two cavity 23 gets gas and expands to extrude on waiting to detect work piece 3 upper port inside wall, improves the leakproofness between round platform portion 15 outer lane and the waiting to detect work piece 3 upper port, thereby improves the gas tightness.
Referring to fig. 3 and 5, a jack post 26 is disposed at the lower end of the circular truncated cone 15, one end of the jack post 26 is exposed at the lower end of the circular truncated cone 15, the other end of the jack post 26 is disposed in the first cavity 22, the other end of the jack post 26 is provided with a disc 27, the disc 27 is in a pot cover shape, the protruding surface of the disc 27 faces downwards, and the edge of the disc 27 is fixedly connected at an inclined position in the circular truncated cone 15; after the round platform part 15 stretches into the upper port of the workpiece 3 to be detected, the jack-prop 26 at the lower end of the round platform part 15 is propped against the limit post 11, the jack-prop 26 moves upwards and pushes the disc 27, the disc 27 is made of PVC elastic materials, the edge of the disc 27 is supported towards the outer circle, the inclined part of the round platform part 15 is propped outwards and extruded on the inner side wall of the upper port of the workpiece 3 to be detected, more surfaces of the round platform part 15 are in contact with the workpiece 3 to be detected, the shape of the round platform part 15 is set, the upper port of the workpiece 3 to be detected is conveniently inserted into the round platform part 15, and more areas of the round platform part 15 are in contact with the workpiece 3 to be detected, so that the air tightness is improved, and the test result is more accurate.
Referring to fig. 3 and 5, the upper surface of the disc 27 is provided with a plurality of ejector rods 28, the ejector rods 28 are in a circumferential array, one end of each ejector rod 28 is fixedly connected to the eccentric position of the upper surface of the disc 27, and the other end of each ejector rod 28 is fixedly connected to the side wall of the first cavity 22 and is arranged close to the inner bottom surface of the second cavity 23; the concave part of the upper surface of the disc 27 gradually protrudes upwards and inclines to push the ejector rod 28, the other end of the ejector rod 28 presses the outer side wall of the second cavity 23, the bulge deformation trend of the second cavity 23 is limited, the extrusion force of the ejector rod 28 is bulged after the lower part of the second cavity 23 bulges, the extrusion force is reacted on the second cavity 23, the middle position of the round platform part 15 can still be tightly attached to the inner side wall of the upper port of the workpiece 3 to be detected, and the tightness between the sealing gasket 9 and the workpiece 3 to be detected is improved.
Referring to fig. 3 and 5, a plurality of extrusion grooves 29 are formed at the edge of the inner surface of the base 16; the inner side wall of the lower end of the cylinder 4 is provided with a plurality of placing grooves 30, the placing grooves 30 are respectively corresponding to the extrusion grooves 29, an atomization nozzle 31 is arranged in the placing grooves 30, and an oil supply unit is arranged between the atomization nozzle 31 and the extrusion grooves 29; the oil supply unit comprises a piston rod 32, a piston cylinder 33, an oil inlet pipe 34 and an oil outlet pipe 35; one end of the piston rod 32 is fixedly connected to the inner bottom surface of the extrusion groove 29, the other end of the piston rod 32 is hermetically and slidably connected in the piston cylinder 33, the piston cylinder 33 is fixedly connected to the inner bottom surface of the extrusion groove 29, the piston cylinder 33 is fixedly connected with an oil inlet pipe 34 and an oil outlet pipe 35, the oil inlet pipe 34 is positioned above the oil outlet pipe 35, the oil inlet pipe 34 is communicated with an external oil drum, the oil outlet pipe 35 is arranged along the inner side wall of the cylinder 4 and is communicated with the atomizing nozzle 31, and the spraying direction of the atomizing nozzle 31 is obliquely upwards arranged; the oil inlet pipe 34 and the oil outlet pipe 35 are respectively provided with one-way valves, the second platform 25 at the upper end of the workpiece 3 to be detected extrudes the substrate 16, the substrate 16 extrudes the piston rod 32 upwards, the inner space of the piston rod 32 is large, the negative pressure is increased, external sealing oil is pumped into the piston cylinder 33 through the oil inlet pipe 34, when the workpiece 3 to be detected breaks away from the sealing gasket 9, the substrate 16 elastically restores to an initial state by itself, the piston rod 32 is pulled down, the sealing oil in the piston cylinder 33 is extruded along the oil outlet pipe 35 by the piston rod 32, and is sprayed out of the atomizing nozzle 31 to the surface of the round table part 15, when the workpiece 3 to be detected is placed next, the round table part 15 is embedded into the upper port of the workpiece 3 to be detected, the sealing oil is smeared in the upper port of the workpiece 3 to be detected, a layer of sealing oil film is formed between the outer side wall of the round table part 15 and the inner side wall of the upper port of the workpiece 3 to be detected, the sealing property between the round table part 15 and the workpiece 3 to be detected is improved again, and the air tightness testing accuracy is improved.
Referring to fig. 3-4, a plurality of semicircular grooves 36 are formed on the lower half inclined surface of the circular platform 15, hook-shaped rubber tentacles 37 are arranged in the semicircular grooves 36, the straight ends of the rubber tentacles 37 are fixedly connected to the lower edge positions of the semicircular grooves 36, hooks of the rubber tentacles 37 are upwards arranged, and concave points 38 are arranged in the inner concave surfaces of the hook parts; the sealing oil is sprayed on the surface of the round platform part 15, if the workpiece 3 to be detected cannot be placed on the inflatable base 2 in time, the sealing oil flows downwards along the surface of the round platform part 15, and the sealing oil flows on the inflatable base 2, so that the sealing oil pollutes the working environment, and after the workpiece 3 to be detected is placed, the sealing ring on the surface of the round platform part 15 is dripped, so that the sealing oil cannot form oil film sealing; by arranging the semicircular groove 36 and the rubber tentacle 37, part of sealing oil remains and remains the column, the sealing oil flows in the semicircular groove 36 and the rubber tentacle 37, so that enough sealing oil can be stably reserved on the round platform part 15 when the next workpiece 3 to be detected is subjected to the air tightness test, and concave points 38 are arranged in the inner concave surface of the hook part, so that the rubber tentacle 37 can hold more sealing oil and benefit from the forming of a sealing oil film;
referring to fig. 6, the inner bottom surface of the groove 10 is provided with a plurality of concave portions 381, a buffer air bag 39 is arranged in the concave portions 381, the buffer air bag 39 is a closed type bag body, and the buffer air bag 39 is in clearance fit in the concave portions 381; through setting up buffer air bag 39, when placing the work piece 3 of waiting to detect, wait to detect work piece 3 in advance and be withstood by buffer air bag 39, leave the clearance between work piece 3 of waiting to detect and the recess 10, prevent to wait to detect work piece 3 lower surface and collide with the recess 10 inner bottom surface, cause the damage of waiting to detect work piece 3 surface, and buffer air bag 39 clearance fit is in concave part 381, when pressing down waiting to detect work piece 3, wait to detect work piece 3 and push down buffer air bag 39, buffer air bag 39 compresses to concave part 381, make recess 10 internal surface smooth and level, do not have the protrusion to push up and wait to detect work piece 3 bottom surface, guarantee the leakproofness between work piece 3 lower surface of waiting to detect and the recess 10.
An auxiliary pressing rod 40 is fixedly connected to the lower surface of the pressing plate 5 as shown in fig. 1-2, one end of the auxiliary pressing rod 40 is fixedly connected to the pressing plate 5, the other end of the auxiliary pressing rod 40 points to the groove 10, and the auxiliary pressing rod 40 is positioned on one side of the cylinder 4; by arranging the auxiliary pressing rod 40, the workpiece 3 to be detected is integrally pressed down, so that the workpiece 3 to be detected is integrally pressed and balanced, the deformation of the workpiece 3 to be detected after being pressed is reduced, and the quality of the workpiece 3 to be detected is ensured.
In the process of performing the air tightness test on the workpiece 3, air escapes, which is caused by the workpiece itself, namely, the workpiece 3 itself has flaws and the surface has holes, and is caused by insufficient tightness between the detection device and the workpiece 3; the above-mentioned improvement through a series of seal structure designs, but also have the possibility that the leakproofness is not enough between work piece 3 and the device, in order to confirm the gas leakage problem that is because the leakproofness is not enough between work piece 3 and the device that awaits measuring, can change sealing oil into the solution that can bubble such as soapy water or washing clothes water, atomizer 31 sprays soapy water on round platform portion 15 surface, the upper end of waiting to detect work piece 3 is embedded in the in-process on round platform portion 15, a portion soapy water adheres to the upper end of waiting to detect work piece 3, then the inflation test, if the atmospheric pressure changes after filling quantitative gas, take down work piece 3 and look over round platform portion 15 periphery and have dense bubble, if there is dense bubble, indicate to be that the leakproofness is not enough between detection device and the work piece 3, still need carry out the leakproofness adjustment setting to the detection device again, then carry out the secondary gas tightness test to this work piece 3.
Embodiment two:
referring to fig. 7, in a first comparative example, as another embodiment of the present invention, a PVC block 41 is fixedly connected to the lower end of the auxiliary pressing rod 40, and a PVC ring 42 is fixedly connected to the lower end surface of the cylinder 4; the PVC block 41 and the PVC circular ring 42 are arranged, so that firstly, the surface of the workpiece 3 to be detected is prevented from being mistakenly touched against the cylinder 4 or the auxiliary pressing rod 40 when the workpiece 3 to be detected is placed, the surface of the workpiece 3 to be detected is damaged, secondly, the surface of the workpiece 3 to be detected is prevented from being pressed out of the cylinder 4 or the auxiliary pressing rod 40, the surface of the workpiece 3 to be detected is prevented from being damaged, and the function of buffering and protecting the workpiece 3 to be detected is achieved.
Working principle: the workpiece 3 to be detected is a new energy automobile steering motor shell, the workpiece 3 to be detected is sleeved on a limit column 11, the lower surface of the workpiece 3 to be detected is located in a groove 10, then a cylinder 7 is driven, the cylinder 7 pushes down a lower pressing plate 5, a cylinder 4 on the lower pressing plate 5 covers the upper end of the workpiece 3 to be detected, meanwhile, the upper surface of the workpiece 3 to be detected is propped against a sealing gasket 9, the lower surface of the workpiece 3 to be detected is extruded on a rubber gasket 12, a quantitative gas is blown into an air inlet pipe 14 through an air supply pump, a pressure gauge on the air inlet pipe 14 displays a numerical value at the moment, the current situation is maintained, whether the numerical value of the pressure gauge is reduced or not is observed, if the numerical value is reduced, the condition that the workpiece 3 to be detected has a gas leakage position point at the moment is indicated, and the new energy automobile steering workpiece 3 to be detected is cast with flaws and cannot be put into use; the air tightness test device is used for detecting the air tightness of each workpiece 3 to be detected one by one, ensuring that the workpieces are qualified products when leaving factories, ensuring the normal and long-time operation of the steering motor when the workpieces are put into use, and is in a semi-automatic mode, so that the air tightness test device has a high effect compared with a pure manual test, and is simple in structure and convenient to operate;
the upper end face of the workpiece 3 to be detected is stepped, after the workpiece 3 to be detected is placed on the inflatable base 2, the cylinder 4 is pressed down, the cylinder 4 covers the upper end of the workpiece 3 to be detected, the upper end of the workpiece 3 to be detected is embedded in an annular gap 19 between the second stepped groove 18 and the round table part 15, meanwhile, the cylinder 4 part is embedded in an upper port of the workpiece 3 to be detected, at the moment, the upper end of the workpiece 3 to be detected is blocked, namely, the upper end of the workpiece 3 to be detected is sealed, and meanwhile, the first platform 20 of the upper end of the workpiece 3 to be detected is blocked through the round table part 15, and the base 16 is matched with the round table part 15, so that the sealing performance between the sealing gasket 9 and the workpiece 3 to be detected is improved, and the air tightness test is more accurate;
the second platform 25 at the upper end of the workpiece 3 to be detected, the second platform 25 is positioned below the first platform 20, the second platform 25 extrudes the extrusion bag 21, meanwhile, the gas in the extrusion bag 21 is input into the second cavity through the pipeline 24, the second cavity 23 is expanded, and the gas is extruded on the inner side wall of the upper port of the workpiece 3 to be detected, so that the tightness between the outer ring of the round platform part 15 and the upper port of the workpiece 3 to be detected is improved, and the air tightness is improved;
after the round platform part 15 stretches into the upper port of the workpiece 3 to be detected, the top column 26 at the lower end of the round platform part 15 is propped against the limit column 11, the top column 26 moves upwards and pushes the disc 27, the disc 27 is made of PVC elastic materials, the edge of the disc 27 is supported outwards, the inclined part of the round platform part 15 is propped outwards and extruded on the inner side wall of the upper port of the workpiece 3 to be detected, so that more surfaces of the round platform part 15 are contacted with the workpiece 3 to be detected, the shape of the round platform part 15 is set, the upper port of the workpiece 3 to be detected is conveniently inserted into the round platform part 15, and more areas of the round platform part 15 are contacted with the workpiece 3 to be detected, thereby improving the air tightness and ensuring more accurate test results;
the upper surface of the disc 27 is concaved inwards and gradually provided with an upper ejector rod 28, the other end of the ejector rod 28 presses the outer side wall of the second cavity 23, so that the bulge deformation trend of the second cavity 23 is limited, the bulge presses the ejector rod 28 after the lower part of the second cavity 23 bulges, the bulge presses the second cavity 23, the middle position of the round platform part 15 can still be tightly attached to the inner side wall of the upper port of the workpiece 3 to be detected, and the tightness between the sealing gasket 9 and the workpiece 3 to be detected is improved;
the second platform 25 at the upper end of the workpiece 3 to be detected extrudes the substrate 16, the substrate 16 extrudes the piston rod 32 upwards, the internal space of the piston rod 32 is large, negative pressure is increased, and external sealing oil is pumped into the piston cylinder 33 through the oil inlet pipe 34, when the workpiece 3 to be detected breaks away from the sealing gasket 9, the substrate 16 is elastically restored to an initial state by the substrate, the piston rod 32 is pulled downwards, the piston rod 32 extrudes the sealing oil in which cylinder of the piston head is extruded along the oil outlet pipe 35 and sprayed out of the atomizing nozzle 31, and the sealing oil is sprayed on the surface of the circular table part 15, when the workpiece 3 to be detected is placed next, the circular table part 15 is embedded into the upper port of the workpiece 3 to be detected, the sealing oil is smeared in the upper port of the workpiece 3 to be detected, a layer of sealing oil film is formed between the outer side wall of the circular table part 15 and the inner side wall of the upper port of the workpiece 3 to be detected, the sealing property between the circular table part 15 and the workpiece 3 to be detected is improved again, and the air tightness test accuracy is improved;
the sealing oil is sprayed on the surface of the round platform part 15, if the workpiece 3 to be detected cannot be placed on the inflatable base 2 in time, the sealing oil flows downwards along the surface of the round platform part 15, and the sealing oil flows on the inflatable base 2, so that the sealing oil pollutes the working environment, and after the workpiece 3 to be detected is placed, the sealing ring on the surface of the round platform part 15 is dripped, so that the sealing oil cannot form oil film sealing; by arranging the semicircular groove 36 and the rubber tentacle 37, part of sealing oil remains and remains the column, the sealing oil flows in the semicircular groove 36 and the rubber tentacle 37, so that enough sealing oil can be stably reserved on the round platform part 15 when the next workpiece 3 to be detected is subjected to the air tightness test, and concave points 38 are arranged in the inner concave surface of the hook part, so that the rubber tentacle 37 can hold more sealing oil and benefit from the forming of a sealing oil film;
by arranging the buffer air bag 39, when the workpiece 3 to be detected is placed, the workpiece 3 to be detected is supported by the buffer air bag 39 in advance, a gap is reserved between the workpiece 3 to be detected and the groove 10, so that the lower surface of the workpiece 3 to be detected is prevented from knocking against the inner bottom surface of the groove 10, the surface of the workpiece 3 to be detected is prevented from being damaged, the buffer air bag 39 is in clearance fit in the concave part 381, when the workpiece 3 to be detected is pressed down, the buffer air bag 39 is pressed down to the concave part 381, the inner surface of the groove 10 is smooth and flat, no protrusion pushes up the bottom surface of the workpiece 3 to be detected, and the tightness between the lower surface of the workpiece 3 to be detected and the groove 10 is ensured;
by arranging the auxiliary pressing rod 40, the workpiece 3 to be detected is integrally pressed down, so that the workpiece 3 to be detected is integrally pressed and balanced, the deformation of the workpiece 3 to be detected after being pressed is reduced, and the quality of the workpiece 3 to be detected is ensured; the PVC block 41 and the PVC circular ring 42 are arranged, so that firstly, the surface of the workpiece 3 to be detected is prevented from being mistakenly touched against the cylinder 4 or the auxiliary pressing rod 40 when the workpiece 3 to be detected is placed, the surface of the workpiece 3 to be detected is damaged, secondly, the surface of the workpiece 3 to be detected is prevented from being pressed out of the cylinder 4 or the auxiliary pressing rod 40, the surface of the workpiece 3 to be detected is prevented from being damaged, and the function of buffering and protecting the workpiece 3 to be detected is achieved.
The front, rear, left, right, up and down are all based on fig. 1 of the drawings in the specification, the face of the device facing the observer is defined as front, the left side of the observer is defined as left, and so on, according to the viewing angle of the person.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a new energy automobile turns to motor housing gas tightness testing arrangement which characterized in that: comprises a hold-down piece (1) and an inflatable base (2); the pressing piece (1) comprises a cylinder (4), a pressing plate (5), a supporting plate (6), an air cylinder (7) and a guide rod (8); the four right-angle positions of the supporting plate (6) are fixedly connected with one end of four guide rods (8) respectively, an air cylinder (7) is fixedly connected to the supporting plate (6), the output end of the air cylinder (7) points to the other end of the guide rod (8), the output end of the air cylinder is fixedly connected with a lower pressing plate (5), the four right-angle positions of the lower pressing plate (5) are slidably connected with the guide rod (8), the lower surface of the lower pressing plate (5) is fixedly connected with one end of a cylinder (4), a ring-shaped sealing gasket (9) is arranged in the cylinder (4), the air charging base (2) is arranged below the cylinder (4), the other end of the guide rod (8) is fixedly connected to the four right-angle positions of the air charging base (2), a groove (10) is formed in the air charging base (2), a limit column (11) is arranged in the groove (10), a rubber pad (12) is arranged at the inner edge of the groove (10), an inner space of the groove (10) is used for placing a workpiece (3) to be detected, an air channel (13) is formed in the air charging base (2), the air outlet end of the air channel (13) penetrates to the surface of the groove (10), the air inlet pipe (14) is communicated with an air inlet pipe (14) at one side of the air charging base (2), and the air supply pump is communicated with the outside;
the sealing gasket (9) comprises a round platform part (15) and a base body (16); the inner top surface of the base body (16) is provided with a first step groove (17), the inner top surface of the first step groove (17) is provided with a second step groove (18), the middle position in the inner top surface of the second step groove (18) is fixedly connected with a round platform part (15), the large end surface of the round platform part (15) is fixedly connected with the inner top of the second step groove (18), and the small end surface of the round platform part (15) is embedded into the upper port of the workpiece (3) to be detected;
the outer edge of the inner top surface of the first step groove (17) is provided with an extrusion bag (21); a first cavity (22) is formed in the round platform part (15), a second cavity (23) in a ring shape is formed in the large end surface wall of the round platform part (15), and the second cavity (23) is communicated with the extrusion bag (21) through a pipeline (24);
the new energy automobile turns to and waits to detect work piece (3) up end for the step form, wait to detect work piece (3) upper end and include first platform (20) and second platform (25), second platform (25) are located the below of first platform (20), wait to detect in annular gap (19) of upper end embedding between second step groove (18) and round platform portion (15) of work piece (3), shutoff first platform (20) of upper end of waiting to detect work piece (3) through round platform portion (15), second platform (25) extrude extrusion bag (21), gas in extrusion bag (21) is input into No. two cavity (23) through pipeline (24) simultaneously, no. two cavity (23) are gaseous and are expanded to extrude on waiting to detect work piece (3) upper port inside wall, improve the leakproofness between round platform portion (15) outer lane and the upper port of waiting to detect work piece (3).
2. The new energy automobile steering motor housing air tightness testing device according to claim 1, wherein: the utility model discloses a rotary table portion, including round platform portion (15), round platform portion (15) lower extreme, the lower extreme of round platform portion (15) is equipped with spliced pole (26), and the lower extreme at round platform portion (15) is exposed to the one end of spliced pole (26), and in cavity (22) were arranged in to the other end of spliced pole (26), the other end of propping was equipped with disc (27), and disc (27) are pot cover form, and the protruding face of disc (27) is down, and the edge rigid coupling of disc (27) is at the interior sloping position of round platform portion (15).
3. The new energy automobile steering motor housing air tightness testing device according to claim 2, wherein: the upper surface of disc (27) is equipped with a plurality of ejector pins (28), and ejector pin (28) become circumference array, and the one end rigid coupling of ejector pin (28) is in disc (27) upper surface eccentric position, and the other end rigid coupling of ejector pin (28) is on cavity (22) lateral wall No. one, and is close to the interior bottom surface position setting of cavity No. two (23).
4. The new energy automobile steering motor housing air tightness testing device according to claim 1, wherein: a plurality of extrusion grooves (29) are formed in the edge position of the inner surface of the base body (16); the inner side wall of the lower end of the cylinder (4) is provided with a plurality of placing grooves (30), the placing grooves (30) are positioned one by one corresponding to the extrusion grooves (29), an atomizing nozzle (31) is arranged in the placing grooves (30), and an oil supply unit is arranged between the atomizing nozzle (31) and the extrusion grooves (29); the oil supply unit comprises a piston rod (32), a piston cylinder (33), an oil inlet pipe (34) and an oil outlet pipe (35); one end rigid coupling of piston rod (32) is in extrusion groove (29) interior bottom surface, the other end sealing sliding connection of piston rod (32) is in piston cylinder (33), piston cylinder (33) rigid coupling is in extrusion groove (29) interior bottom surface, rigid coupling oil feed pipe (34) and play oil pipe (35) on piston cylinder (33), oil feed pipe (34) are located play oil pipe (35) top, oil feed pipe (34) intercommunication external oil drum, go out oil pipe (35) along drum (4) lateral wall inside to communicate atomizer (31), the spray direction slope of atomizer (31) upwards sets up.
5. The new energy automobile steering motor housing air tightness testing device according to claim 2, wherein: a plurality of semicircular grooves (36) are formed in the lower half inclined surface of the round platform portion (15), hook-shaped rubber tentacles (37) are arranged in the semicircular grooves (36), the straight ends of the rubber tentacles (37) are fixedly connected to the lower edge positions of the semicircular grooves (36), hooks of the rubber tentacles (37) are arranged upwards, and concave points (38) are formed in inner concave surfaces of the hook portions.
6. The new energy automobile steering motor housing air tightness testing device according to claim 1, wherein: a plurality of concave parts (381) are formed in the inner bottom surface of the groove (10), a buffer air bag (39) is arranged in the concave parts (381), the buffer air bag (39) is a closed type bag body, and the buffer air bag (39) is in clearance fit in the concave parts (381).
7. The new energy automobile steering motor housing air tightness testing device according to claim 1, wherein: the lower surface rigid coupling of holding down plate (5) has supplementary depression bar (40), and the one end rigid coupling of supplementary depression bar (40) is on holding down plate (5), and the other end of supplementary depression bar (40) points to recess (10), and supplementary depression bar (40) are located drum (4) one side.
8. The new energy automobile steering motor housing tightness testing device according to claim 7, wherein: the lower end of the auxiliary pressing rod (40) is fixedly connected with a PVC block (41), and the lower end surface of the cylinder (4) is fixedly connected with a PVC circular ring (42).
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| CN202210490825.0A CN114754946B (en) | 2022-05-07 | 2022-05-07 | New energy automobile turns to motor housing gas tightness testing arrangement |
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| CN115265954B (en) * | 2022-07-26 | 2023-09-26 | 无锡正杰机械科技有限公司 | Automobile turbine shell air tightness detection device and detection method |
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