CN110455912B - Method for detecting surface dent of valve body - Google Patents
Method for detecting surface dent of valve body Download PDFInfo
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- CN110455912B CN110455912B CN201910811702.0A CN201910811702A CN110455912B CN 110455912 B CN110455912 B CN 110455912B CN 201910811702 A CN201910811702 A CN 201910811702A CN 110455912 B CN110455912 B CN 110455912B
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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
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/84—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields by applying magnetic powder or magnetic ink
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a method for detecting surface indentations of a valve body, which comprises the following steps: a. placing the cast valve body into a cleaning tank, cleaning the surface of the valve body, and removing grease on the surface of the processed valve body; b. drying the cleaned valve body to enable the valve body to be in a dry state; c. placing the dried valve body into flaw detection equipment, and performing flaw detection treatment on the surface of the valve body in a mode of spraying magnetic powder so as to determine whether the surface of the valve body has defects; d. marking the detected defect part to remove the surface dent, and performing secondary flaw detection on the valve body until no dent is incomplete on the valve body; e. demagnetizing the valve body to eliminate magnetism on the valve body; f. and cleaning the demagnetized valve body to remove the magnetic powder remained on the surface.
Description
Technical Field
The invention belongs to the technical field of valve processing, and particularly relates to a method for detecting surface dents of a valve body.
Background
The valve is a pipeline accessory for opening and closing a pipeline, controlling the flow direction, adjusting and controlling parameters (temperature, pressure and flow rate) of a conveying medium. Depending on their function, they can be classified into shutoff valves, check valves, regulating valves, etc.
The valve comprises a valve body and a valve core, wherein the valve body is a shell of the valve, the processing of the valve body directly affects the quality of the valve, and after the valve body is processed, the surface of the valve body needs to be ensured not to be provided with groove cracks so as to ensure the tightness of the valve, so that the valve body is indispensable to detect the valve after production; the detection method of the valve body is nondestructive detection, the magnetic powder inspection is one of the methods, and the magnetic powder needs to be sprayed on the surface of the valve body during the magnetic powder inspection.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for detecting the surface dent of a valve body.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a method for detecting a valve body surface indentation, comprising:
a. placing the cast valve body into a cleaning tank, cleaning the surface of the valve body, and removing grease on the surface of the processed valve body;
b. drying the cleaned valve body to enable the valve body to be in a dry state;
c. placing the dried valve body into flaw detection equipment, and performing flaw detection treatment on the surface of the valve body in a mode of spraying magnetic powder so as to determine whether the surface of the valve body has defects;
d. marking the detected defect part to remove the surface dent, and performing secondary flaw detection on the valve body until no dent is incomplete on the valve body;
e. demagnetizing the valve body to eliminate magnetism on the valve body;
f. cleaning the demagnetized valve body to remove the magnetic powder remained on the surface;
the flaw detection equipment in the step c comprises a treatment box, a fixed claw assembly arranged in the treatment box and a sealing assembly arranged below the fixed claw assembly, wherein a treatment cavity is arranged on the treatment box, an observation window is arranged on the side wall of the treatment cavity, a first connecting plate is arranged on the inner wall of the treatment cavity, a cavity is arranged on the first connecting plate, a plurality of spray holes are formed in the side wall of the cavity, a storage cavity is arranged at the bottom of the treatment cavity, a material conveying cavity is arranged on the side wall of the treatment cavity, and the storage cavity is communicated with the cavity through the material conveying cavity; the sealing assembly comprises a first push rod capable of horizontally moving, a second connecting plate arranged on the first push rod and a metal block arranged at the bottom of the second connecting plate, and when the valve body is placed into the processing cavity, the side wall of the second connecting plate is contacted with the inner wall of the valve body; after the valve body is dried, the valve body is carried through a mechanical arm, the valve body is placed into a processing cavity, a fixed claw assembly is in contact with the valve body, the valve body is fixed in the processing cavity, a first push rod pushes a second connecting plate to move forwards, the second connecting plate is inserted into the valve body, the side wall of the second connecting plate is in contact with the inner wall of the valve body, the valve body is sealed, a metal block is in contact with the side wall of the valve body, current is connected to the valve body, the valve body generates a magnetic field, magnetic powder in a storage cavity enters a cavity through a material conveying cavity, the magnetic powder is sprayed out of a spray hole, the magnetic powder is sprayed on the surface of the valve body, and whether the surface of the valve body has defects or not is determined, so that the flaw detection of the valve body is completed.
When the magnetic powder spraying is finished, the second connecting plate moves out of the valve body, and the second connecting plate brings out the magnetic powder on the valve body opening when moving, so that the magnetic powder is prevented from remaining in the valve body, and the loss of the magnetic powder is reduced; under the action of the fixed claw component, the valve body is fixed in the processing cavity, so that the valve body is suspended in the processing cavity, and flaw detection is carried out on the valve body; under the arrangement of the spray holes on the first connecting plate, the magnetic powder is more uniformly sprayed on the side wall of the valve body, so that the part of the detected area on the surface of the valve body can be covered by the magnetic powder, and the defect on the valve body can be detected; the valve body in the processing box is convenient to directly observe through the observation window, so that the detection of the valve body is more visual.
The drying method in the step b is that the cleaned valve body is placed into a drying box, the temperature in the drying box is kept at 60 ℃, and air flow is introduced until the moisture on the valve body is dried.
After the valve body is dried, the valve body is directly placed outside, and after the valve body is cooled to room temperature, the valve body is placed into flaw detection equipment for detection.
The magnetic powder is magnetic ferric oxide powder.
The demagnetizing operation is to switch in direct current at two ends of the valve body, continuously change the current direction and gradually reduce the current to zero value.
The side wall of the treatment box is provided with a first equipment cavity, a first air cylinder is arranged in the first equipment cavity, the fixed jaw assembly comprises a second push rod arranged on a piston rod of the first air cylinder and a clamping jaw arranged on the fixed jaw, a first movable cavity is arranged on the clamping jaw, a fixed spring is arranged in the first movable cavity, one end of the fixed spring is provided with a first fixed block, and a first groove is formed in the first fixed block; the two groups of fixed claw components are respectively arranged at two sides of the treatment box, a third connecting plate is arranged on the left clamping jaw, and a fourth connecting plate matched with the third connecting plate is arranged on the right clamping jaw; after the valve body is placed into the processing cavity under the action of the mechanical arm, the first air cylinder pushes the second push rod to move forwards, so that the left clamping jaw and the right clamping jaw are close to each other, the third connecting plate and the fourth connecting plate are mutually matched to fix the left clamping jaw and the right clamping jaw until the left clamping jaw and the right clamping jaw are contacted, so that the left clamping jaw and the right clamping jaw are fixed together, the upper part of the valve body is fixed between the two clamping jaws, the first fixed block is contacted with the side wall of the valve body, the first fixed block enters the first movable cavity, the fixed spring generates thrust on the first fixed block, so that the first fixed block generates extrusion force on the valve body, and the valve body is fixed in the processing cavity to perform detection processing on the valve body; under the mutual matching of the two fixed claw assemblies, the two clamping claws clamp the upper part of the valve body, the fixed claws are matched with the valve body, and the valve body is fixed so as to be suspended in the processing cavity; under the cooperation of the third connecting plate and the fourth connecting plate, the two clamping jaws are stably fixed together and are mutually matched with the first air cylinder, so that the burden of the first air cylinder is reduced; under the cooperation of the first fixed block and the fixed spring, the first fixed block generates extrusion force on the side wall of the valve body, so that the friction force between the clamping jaw and the valve body is increased, and the fixing effect of the clamping jaw on the valve body is improved; through the restriction of first recess, make the valve body lateral wall just inlay in first recess, make the better and valve body lateral wall of first fixed block contact, further promote the fixed effect of clamping jaw to the valve body.
A baffle is arranged on the inner wall of the processing cavity, the baffle and the first connecting plate are oppositely arranged, a second groove is arranged on the baffle, and an arc surface is arranged on the inner wall of the second groove; the side wall of the processing box is provided with a second equipment cavity, a second air cylinder is arranged in the second equipment cavity, a piston rod of the second air cylinder is provided with a first push block, the top of the first push block is provided with a first connecting block, the top of the first connecting block is provided with a chute, and the bottom of the processing cavity is provided with a first opening communicated with the storage cavity; after the valve body is fixed in the processing cavity, the magnetic powder in the storage cavity enters the cavity through the material conveying cavity, so that the magnetic powder is sprayed out of the spray hole, part of the magnetic powder is directly sprayed on the valve body, the other part of the magnetic powder is contacted with the baffle plate from the upper part and the lower part of the valve body through the valve body, the magnetic powder impacted on the baffle plate is impacted on the other side of the valve body after rebounded through the baffle plate, and the magnetic powder is sprayed on the other side wall of the valve body; the redundant magnetic powder falls off from the valve body, so that the magnetic powder falls off to the bottom of the processing cavity, the second air cylinder pushes the first pushing block to move forwards, the first pushing block pushes the magnetic powder at the bottom of the processing cavity to the first opening, the magnetic powder at the bottom of the processing cavity falls off from the first opening to the storage cavity, and the magnetic powder at the bottom of the processing cavity is recovered; the magnetic powder is sprayed on the baffle to collide with the baffle, and rebounds after contacting with the baffle, so that the magnetic powder is sprung to the other side of the valve body, and the periphery of the valve body is uniformly coated with the magnetic powder so as to detect the valve body; under the cambered surface of the inner wall of the second groove, the magnetic powder rebounded from the baffle is guided, so that the magnetic powder rebounded from the baffle moves towards the middle part of the other side of the valve body, and the magnetic powder is sprayed on the other side of the valve body, so that the magnetic powder is distributed on the surface of the valve body, and the flaw detection treatment of the valve body is completed; under the arrangement of the first pushing block, the magnetic powder falling on the bottom of the processing cavity is recovered, so that the redundant magnetic powder directly returns to the storage cavity, the cleaning difficulty of the processing cavity is reduced, and the magnetic powder waste is reduced; the chute is arranged on the first connecting block, so that the magnetic powder is prevented from being remained on the first connecting block after falling on the first connecting block, and the magnetic powder is enabled to fall on one side of the first pushing block, so that the magnetic powder at the bottom of the processing cavity is pushed into the first opening to be recycled.
The invention has the following advantages: the second connecting plate directly stretches into the valve body after the valve body is placed into the processing cavity for sealing the valve body, the magnetic powder is prevented from entering the valve body in the process of spraying the magnetic powder, the second connecting plate moves out of the valve body after the magnetic powder spraying is completed, the second connecting plate brings out the magnetic powder on the valve body opening during moving, the magnetic powder is prevented from remaining in the valve body, and the loss of the magnetic powder is reduced.
Drawings
FIG. 1 is a schematic diagram of the flaw detection apparatus of the present invention.
FIG. 2 is a schematic cross-sectional view of the flaw detection apparatus of the present invention.
Fig. 3 is an enlarged view at a in fig. 2.
Fig. 4 is an enlarged view at B in fig. 2.
Fig. 5 is an enlarged view at C in fig. 2.
FIG. 6 is a schematic cross-sectional view of a flaw detection apparatus according to the present invention.
Fig. 7 is an enlarged view of D in fig. 6.
FIG. 8 is a schematic cross-sectional view of a flaw detection apparatus according to the present invention.
Fig. 9 is an enlarged view at E in fig. 8.
Fig. 10 is an enlarged view of F in fig. 8.
FIG. 11 is a schematic cross-sectional view of a flaw detection apparatus according to the present invention.
Fig. 12 is an enlarged view at G in fig. 11.
Fig. 13 is a schematic view of the structure of the valve body of the present invention.
Detailed Description
A method for detecting a valve body surface indentation, comprising: a. placing the cast valve body into a cleaning tank, cleaning the surface of the valve body, and removing grease on the surface of the processed valve body; b. drying the cleaned valve body to enable the valve body to be in a dry state; c. placing the dried valve body into flaw detection equipment, and performing flaw detection treatment on the surface of the valve body in a mode of spraying magnetic powder so as to determine whether the surface of the valve body has defects; d. marking the detected defect part to remove the surface dent, and performing secondary flaw detection on the valve body until no dent is incomplete on the valve body; e. demagnetizing the valve body to eliminate magnetism on the valve body; f. cleaning the demagnetized valve body to remove the magnetic powder remained on the surface; the drying method in the step b is that the cleaned valve body is placed into a drying box, the temperature in the drying box is kept at 60 ℃, and air flow is introduced until the moisture on the valve body is dried; after the valve body is dried, the valve body is directly placed outside, and after the valve body is cooled to room temperature, the valve body is placed into flaw detection equipment for detection; the magnetic powder is magnetic ferric oxide powder; the demagnetizing operation is to switch in direct current at two ends of the valve body, continuously change the current direction and gradually reduce the current to zero value.
As shown in fig. 1-12, the flaw detection device in the step c comprises a treatment box 1, a fixed claw assembly arranged in the treatment box 1 and a sealing assembly arranged below the fixed claw assembly, wherein a treatment cavity is arranged on the treatment box 1, an observation window is arranged on the side wall of the treatment cavity, a first connecting plate 13 is arranged on the inner wall of the treatment cavity, a cavity is arranged on the first connecting plate 13, a plurality of spray holes are arranged on the side wall of the cavity, a storage cavity 17 is arranged at the bottom of the treatment cavity, magnetic powder is filled in the storage cavity, a material conveying cavity 18 is arranged on the side wall of the treatment cavity, the storage cavity 17 is communicated with the cavity through the material conveying cavity 18, an air pump is arranged in the cavity, and the magnetic powder in the storage cavity can be conveyed into the cavity under the action of the air pump; the sealing assembly comprises a first push rod 3 capable of horizontally moving, a second connecting plate 31 arranged on the first push rod 3 and a metal block 36 arranged at the bottom of the second connecting plate 31, and when the valve body 4 is placed into the processing cavity, the side wall of the second connecting plate 31 is contacted with the inner wall of the valve body 4; after the valve body is dried, the valve body is carried by a manipulator, the valve body is placed into a processing cavity, a fixed claw component is contacted with the valve body, the valve body is fixed in the processing cavity, a first push rod 3 pushes a second connecting plate 31 to move forwards, the second connecting plate 31 is inserted into the valve body, the side wall of the second connecting plate 31 is contacted with the inner wall of the valve body, the valve body is sealed, a metal block 36 is contacted with the side wall of the valve body, current is connected to the valve body, a magnetic field is generated by the valve body, magnetic powder in a storage cavity 17 enters a cavity through a material conveying cavity 18, the magnetic powder is sprayed out from a spray hole, the magnetic powder is sprayed on the surface of the valve body, and the surface of the valve body is detected to determine whether defects exist on the surface of the valve body, so that the flaw detection of the valve body is completed.
When the magnetic powder spraying is finished, the second connecting plate moves out of the valve body, and the second connecting plate brings out the magnetic powder on the valve body opening when moving, so that the magnetic powder is prevented from remaining in the valve body, and the loss of the magnetic powder is reduced; under the action of the fixed claw component, the valve body is fixed in the processing cavity, so that the valve body is suspended in the processing cavity, and flaw detection is carried out on the valve body; under the arrangement of the spray holes on the first connecting plate, the magnetic powder is more uniformly sprayed on the side wall of the valve body, so that the part of the detected area on the surface of the valve body can be covered by the magnetic powder, and the defect on the valve body can be detected; the valve body in the processing box is convenient to directly observe through the observation window, so that the detection of the valve body is more visual.
A third equipment cavity 12 is arranged on the side wall of the treatment box, and a third air cylinder 121 is arranged in the third equipment cavity and is used for driving the first push rod to horizontally move.
The second connecting plate is provided with a second movable cavity, the side wall of the second movable cavity is provided with a plurality of second openings, a second push block 32 is arranged in the second movable cavity, the second push block penetrates through the second openings, the second push block is hinged with a first connecting rod 321, the second movable cavity is internally provided with a first supporting spring 33 matched with the first connecting rod, the first push rod is provided with a third movable cavity communicated with the second movable cavity, and the third movable cavity is internally provided with a third push rod 34 matched with the first connecting rod in a penetrating manner; after the second connecting plate enters the valve body, the third push rod moves into the second movable cavity, the third push rod contacts with the first connecting rod, so that the third push rod pushes the first connecting rod to move towards the bottom of the second movable cavity, the first connecting rod rotates around the connecting point, the first connecting rod pushes the second push block to extend out of the second opening, the second push block contacts with the inner wall of the valve body, the second connecting plate is fixed in the valve body, the matching effect of the second connecting plate and the valve body is improved, and the sealing effect of the second connecting plate to the valve body is guaranteed.
A ring groove matched with the second opening is formed in the side wall of the second connecting plate, a rubber film is arranged in the ring groove, and the side wall of the rubber film is fixed on the inner wall of the ring groove in an adhesive mode; when the second ejector pad stretches out the back from the second opening in, the second ejector pad contacts with the rubber membrane inner wall, makes the second ejector pad promote the rubber membrane and outwards moves, and the rubber membrane produces deformation under the second ejector pad, makes rubber membrane and valve body inner wall contact, increases the area of contact of second connecting plate and valve body inner wall under the rubber membrane effect, fills the space of second connecting plate and valve body inner wall, avoids the magnetic powder to enter into inside the valve body, promotes the closing effect of second connecting plate to the valve body.
The side wall of the treatment box is provided with a first through hole, a first push rod penetrates through the first through hole, one end of the first push rod is provided with a limiting plate, the limiting plate cannot be separated from the first through hole, one end of a third push rod is provided with a push plate, one end of a third movable cavity is provided with a second through hole matched with the push plate, the inner wall of the third movable cavity is provided with a first limiting block 35, the third push rod is provided with a first supporting plate 341, the first supporting plate is provided with a second supporting spring 342, the other end of the second supporting spring is fixedly connected to the first limiting block, and the inner wall of the third movable cavity is provided with a second supporting plate matched with the first supporting plate; when the valve body is placed in the processing cavity, the third cylinder drives the piston rod to extend out, the piston rod is contacted with the push plate, and under the action of the second supporting spring, the third push rod drives the first push rod to move forwards together, so that the second connecting plate is pushed into the valve body; when the second connecting plate enters the valve body, the limiting plate moves to one end of the first through hole, the first push rod cannot move continuously, the third air cylinder drags the third push rod to move in the second movable cavity, the third push rod is contacted with the first connecting rod, the second push block is pushed out from the second opening, so that the second push block pushes the rubber film to deform to be contacted with the inner wall of the valve body, and the valve body is sealed to prevent magnetic powder from entering the valve body.
The side wall of the treatment box 1 is provided with a first equipment cavity 11, a first air cylinder 111 is arranged in the first equipment cavity 11, the fixed jaw assembly comprises a second push rod 2 arranged on a piston rod of the first air cylinder 111 and a clamping jaw 21 arranged on the second push rod 2, a first movable cavity is arranged on the clamping jaw 21, a fixed spring 221 is arranged in the first movable cavity, one end of the fixed spring 221 is provided with a first fixed block 22, and a first groove is formed in the first fixed block 22; the two groups of fixed claw components are respectively arranged at two sides of the treatment box 1, a third connecting plate 25 is arranged on the left clamping jaw, and a fourth connecting plate 26 matched with the third connecting plate 25 is arranged on the right clamping jaw; after the valve body is placed into the processing cavity under the action of the mechanical arm, the first cylinder 111 pushes the second push rod 2 to move forwards, so that the left clamping jaw and the right clamping jaw are close to each other, until the left clamping jaw contacts with the right clamping jaw, the third connecting plate 25 and the fourth connecting plate 26 mutually cooperate to fix the left clamping jaw and the right clamping jaw, so that the left clamping jaw and the right clamping jaw are fixed together, the upper part of the valve body is fixed between the two clamping jaws, the first fixed block 22 contacts with the side wall of the valve body, the first fixed block 22 enters into the first movable cavity, the fixed spring 221 generates thrust on the first fixed block 22, so that the first fixed block 22 generates extrusion force on the valve body, and the valve body is fixed in the processing cavity to perform detection processing on the valve body; under the mutual matching of the two fixed claw assemblies, the two clamping claws clamp the upper part of the valve body, the fixed claws are matched with the valve body, and the valve body is fixed so as to be suspended in the processing cavity; under the cooperation of the third connecting plate and the fourth connecting plate, the two clamping jaws are stably fixed together and are mutually matched with the first air cylinder, so that the burden of the first air cylinder is reduced; under the cooperation of the first fixed block and the fixed spring, the first fixed block generates extrusion force on the side wall of the valve body, so that the friction force between the clamping jaw and the valve body is increased, and the fixing effect of the clamping jaw on the valve body is improved; through the restriction of first recess, make the valve body lateral wall just inlay in first recess, make the better and valve body lateral wall of first fixed block contact, further promote the fixed effect of clamping jaw to the valve body.
The two sides of the first movable cavity are respectively provided with a through cavity, a second fixed block 24 is arranged in the through cavity, one end of the second fixed block is provided with a second groove, the side wall of the second fixed block is provided with a sliding block, the inner wall of the through cavity is provided with a sliding groove matched with the sliding block, the bottom of the first fixed block is provided with a second connecting block, the bottom of the second fixed block is provided with a third connecting block, the second connecting block is connected with the third connecting block through a second connecting rod 23, two ends of the second connecting rod are respectively hinged to the second connecting block and the third connecting block, and the middle part of the second connecting rod is rotatably connected in the first movable cavity; when the two clamping jaws are mutually close to each other to fix the valve body, the valve body pushes the first fixed block to move into the first movable cavity, the first fixed block pushes the second connecting rod to rotate around the connecting point when moving, and the other end of the second connecting rod pushes the second fixed block to move outside the through cavity, so that the second fixed block is contacted with the side wall of the valve body, the side wall of the valve body is embedded into the second groove, the side wall of the valve body is contacted with the inner wall of the second groove, and the contact effect of the second fixed block and the valve body is improved; the second fixing block and the first fixing block are matched with each other to provide pressure for the side wall of the valve body, the fixing effect of the clamping jaw on the valve body is improved, and the valve body is stably fixed in the processing cavity.
The left clamping jaw and the right clamping jaw have the same structure except the third connecting plate and the fourth connecting plate; the clamping jaw end face is provided with a fourth movable cavity, the third connecting plate is rotatably arranged on the left clamping jaw, one end of the third connecting plate is provided with a lug 251, one side of the lug is provided with an arc surface, the other end of the lug is provided with a fourth connecting block 252, the fourth connecting plate is arranged in the fourth movable cavity on the right clamping jaw, the bottom of the fourth connecting plate is provided with a connecting groove 261 matched with the fourth connecting block, the top of the right clamping jaw is provided with a fourth air cylinder 27, a piston rod of the fourth air cylinder penetrates through the fourth movable cavity of the right clamping jaw, the fourth connecting plate is arranged on the piston rod of the fourth air cylinder, and one end of the fourth connecting plate is arranged outside the fourth movable cavity; after left side clamping jaw and right side clamping jaw are close to each other, fourth connecting plate one end inserts the fourth movable chamber on the left side clamping jaw, make fourth connecting plate one end contact with the lug on the third connecting plate, the fourth connecting plate promotes the third connecting plate and rotates around the tie point, make the third connecting plate rotate to the horizontality, the fourth connecting block on the third connecting plate inserts in the area spread groove, make third connecting plate and fourth connecting plate form fixed cooperation, thereby fix two clamping jaws together, make fourth connecting plate and third connecting plate mutually support with first cylinder, promote the connection effect of two clamping jaws, thereby promote the fixed effect of clamping jaw to the valve body.
A baffle plate 14 is arranged on the inner wall of the processing cavity, the baffle plate 14 and the first connecting plate 13 are oppositely arranged, a second groove is arranged on the baffle plate 14, and an arc surface is arranged on the inner wall of the second groove; a second equipment cavity 16 is formed in the side wall of the processing box 1, a second air cylinder 161 is arranged in the second equipment cavity 16, a first push block 15 is arranged on a piston rod of the second air cylinder 161, a first connecting block 151 is arranged at the top of the first push block 15, a chute is arranged at the top of the first connecting block 151, and a first opening communicated with the storage cavity 17 is formed in the bottom of the processing cavity; after the valve body is fixed in the processing cavity, the magnetic powder in the storage cavity 17 enters the cavity through the material conveying cavity 18, so that the magnetic powder is sprayed out of the spray hole, part of the magnetic powder is directly sprayed on the valve body, the other part of the magnetic powder is contacted with the baffle plate 14 from the upper part and the lower part of the valve body through the valve body, the magnetic powder impacted on the baffle plate 14 is impacted on the other side of the valve body after rebounded through the baffle plate 14, and the magnetic powder is sprayed on the other side wall of the valve body; the redundant magnetic powder falls from the valve body, so that the magnetic powder falls to the bottom of the processing cavity, the second cylinder 161 pushes the first pushing block 15 to move forwards, the first pushing block 15 pushes the magnetic powder at the bottom of the processing cavity to the first opening, the magnetic powder at the bottom of the processing cavity falls to the storage cavity 17 from the first opening, and the magnetic powder at the bottom of the processing cavity is recovered; the magnetic powder is sprayed on the baffle to collide with the baffle, and rebounds after contacting with the baffle, so that the magnetic powder is sprung to the other side of the valve body, and the periphery of the valve body is uniformly coated with the magnetic powder so as to detect the valve body; under the cambered surface of the inner wall of the second groove, the magnetic powder rebounded from the baffle is guided, so that the magnetic powder rebounded from the baffle moves towards the middle part of the other side of the valve body, and the magnetic powder is sprayed on the other side of the valve body, so that the magnetic powder is distributed on the surface of the valve body, and the flaw detection treatment of the valve body is completed; under the arrangement of the first pushing block, the magnetic powder falling on the bottom of the processing cavity is recovered, so that the redundant magnetic powder directly returns to the storage cavity, the cleaning difficulty of the processing cavity is reduced, and the magnetic powder waste is reduced; the chute is arranged on the first connecting block, so that the magnetic powder is prevented from being remained on the first connecting block after falling on the first connecting block, and the magnetic powder is enabled to fall on one side of the first pushing block, so that the magnetic powder at the bottom of the processing cavity is pushed into the first opening to be recycled.
The first cylinder, the second cylinder, the third cylinder and the fourth cylinder are shown in the schematic diagram, and the specific internal structure of the first cylinder, the second cylinder, the third cylinder and the fourth cylinder is the same as that of the cylinder on the market.
When the valve body is detected, the dried valve body is conveyed into a processing box through a mechanical arm, and after the valve body enters a processing cavity, a first air cylinder pushes a second push rod to move forwards, so that a left clamping jaw and a right clamping jaw are mutually close to clamp the valve body, a third connecting plate and a fourth plate are matched, and the clamping effect of the clamping jaw on the valve body is improved; the third cylinder drives the second push rod to move forwards, so that the second connecting plate is inserted into the valve body, the rubber film is contacted with the inner wall of the valve body, the valve body is closed, magnetic powder enters the cavity under the action of the air pump, the magnetic powder is sprayed out of the spray hole and is sprayed on the surface of the valve body, the magnetic powder is covered on the valve body, and the surface of the valve body is detected; when the spray hole does not spray the magnetic powder any more, the pushing block moves forwards to push the magnetic powder at the bottom of the processing cavity into the storage cavity, and the magnetic powder at the bottom of the processing cavity is collected; when the valve body needs to be taken out of the processing cavity after detection is completed, the second connecting plate is separated from the valve body, magnetic powder at the port of the valve body is taken out together when the second connecting plate moves, the magnetic powder at the port of the valve body is cleaned, the manipulator stretches into the processing cavity to grab the valve body, the fourth cylinder drives the fourth connecting plate to move upwards, the fourth connecting block is separated from the connecting groove, the first cylinder drives the two clamping jaws to be separated, and the clamping jaws are separated from the side wall of the valve body, so that the valve body is taken out under the action of the manipulator, and the detected valve body is processed.
Claims (7)
1. A method for detecting a dent in a surface of a valve body, comprising: comprising the following steps:
a. placing the cast valve body into a cleaning tank, cleaning the surface of the valve body, and removing grease on the surface of the processed valve body;
b. drying the cleaned valve body to enable the valve body to be in a dry state;
c. placing the dried valve body into flaw detection equipment, and performing flaw detection treatment on the surface of the valve body in a mode of spraying magnetic powder so as to determine whether the surface of the valve body has defects;
d. marking the detected defect part to remove the surface dent, and performing secondary flaw detection on the valve body until no dent is incomplete on the valve body;
e. demagnetizing the valve body to eliminate magnetism on the valve body;
f. cleaning the demagnetized valve body to remove the magnetic powder remained on the surface;
the flaw detection equipment in the step c comprises a treatment box (1), a fixed claw assembly arranged in the treatment box (1) and a sealing assembly arranged below the fixed claw assembly, wherein a treatment cavity is arranged on the treatment box (1), an observation window is arranged on the side wall of the treatment cavity, a first connecting plate (13) is arranged on the inner wall of the treatment cavity, a cavity is arranged on the first connecting plate (13), a plurality of spray holes are arranged on the side wall of the cavity, a storage cavity (17) is arranged at the bottom of the treatment cavity, a material conveying cavity (18) is arranged on the side wall of the treatment cavity, and the storage cavity (17) is communicated with the cavity through the material conveying cavity (18); the sealing assembly comprises a first push rod (3) capable of horizontally moving, a second connecting plate (31) arranged on the first push rod (3) and a metal block (36) arranged at the bottom of the second connecting plate (31), and when the valve body (4) is placed into the processing cavity, the side wall of the second connecting plate (31) is contacted with the inner wall of the valve body (4); after the valve body is dried, the valve body is carried through a mechanical arm, the valve body is placed into a processing cavity, a fixed claw assembly is contacted with the valve body, the valve body is fixed in the processing cavity, a first push rod (3) pushes a second connecting plate (31) to move forwards, the second connecting plate (31) is inserted into the valve body, the side wall of the second connecting plate (31) is contacted with the inner wall of the valve body, the valve body is internally sealed, a metal block (36) is contacted with the side wall of the valve body, current is connected to the valve body, the valve body generates a magnetic field, magnetic powder in a storage cavity (17) enters into a cavity through a material conveying cavity (18), the magnetic powder is sprayed out from a spray hole, the magnetic powder is sprayed on the surface of the valve body, and the surface of the valve body is detected to determine whether defects exist on the surface of the valve body or not, so that the flaw detection of the valve body is completed.
2. A method for detecting a dent in a surface of a valve body as set forth in claim 1, wherein: the drying method in the step b is that the cleaned valve body is placed into a drying box, the temperature in the drying box is kept at 60 ℃, and air flow is introduced until the moisture on the valve body is dried.
3. A method for detecting a dent in a surface of a valve body as set forth in claim 2, wherein: after the valve body is dried, the valve body is directly placed outside, and after the valve body is cooled to room temperature, the valve body is placed into flaw detection equipment for detection.
4. A method for detecting a dent in a surface of a valve body as set forth in claim 1, wherein: the magnetic powder is magnetic ferric oxide powder.
5. A method for detecting a dent in a surface of a valve body as set forth in claim 1, wherein: the demagnetizing operation is to switch in direct current at two ends of the valve body, continuously change the current direction and gradually reduce the current to zero value.
6. A method for detecting a dent in a surface of a valve body as set forth in claim 1, wherein: the device comprises a processing box (1), and is characterized in that a first equipment cavity (11) is formed in the side wall of the processing box (1), a first air cylinder (111) is arranged in the first equipment cavity (11), the fixed jaw assembly comprises a second push rod (2) arranged on a piston rod of the first air cylinder (111) and a clamping jaw (21) arranged on the second push rod (2), a first movable cavity is formed in the clamping jaw (21), a fixed spring (221) is arranged in the first movable cavity, one end of the fixed spring (221) is provided with a first fixed block (22), and a first groove is formed in the first fixed block (22); the two groups of fixed claw components are respectively arranged at two sides of the treatment box (1), a third connecting plate (25) is arranged on the left clamping jaw, and a fourth connecting plate (26) matched with the third connecting plate (25) is arranged on the right clamping jaw; after the valve body is placed into the processing cavity under the action of the mechanical arm, the first air cylinder (111) pushes the second push rod (2) to move forwards, the left clamping jaw and the right clamping jaw are made to approach each other, until the left clamping jaw and the right clamping jaw are contacted, the third connecting plate (25) and the fourth connecting plate (26) are mutually matched to fix the left clamping jaw and the right clamping jaw, the left clamping jaw and the right clamping jaw are fixed together, the upper part of the valve body is fixed between the two clamping jaws, the first fixing block (22) is contacted with the side wall of the valve body, the first fixing block (22) enters into the first movable cavity, the fixing spring (221) generates thrust for the first fixing block (22), the first fixing block (22) generates extrusion force for the valve body, and the valve body is fixed in the processing cavity to detect the valve body.
7. A method for detecting a dent in a surface of a valve body as set forth in claim 1, wherein: a baffle (14) is arranged on the inner wall of the treatment cavity, the baffle (14) and the first connecting plate (13) are oppositely arranged, a second groove is arranged on the baffle (14), and an arc surface is arranged on the inner wall of the second groove; a second equipment cavity (16) is formed in the side wall of the processing box (1), a second air cylinder (161) is arranged in the second equipment cavity (16), a first push block (15) is arranged on a piston rod of the second air cylinder (161), a first connecting block (151) is arranged at the top of the first push block (15), a chute is arranged at the top of the first connecting block (151), and a first opening communicated with the storage cavity (17) is formed in the bottom of the processing cavity; after the valve body is fixed in the processing cavity, the magnetic powder in the storage cavity (17) enters the cavity through the material conveying cavity (18) so that the magnetic powder is sprayed out of the spray hole, part of the magnetic powder is directly sprayed on the valve body, the other part of the magnetic powder is contacted with the baffle plate (14) from the upper part and the lower part of the valve body through the valve body, and the magnetic powder impacted on the baffle plate (14) is impacted on the other side of the valve body after rebounded through the baffle plate (14), and the magnetic powder is sprayed on the other side wall of the valve body; redundant magnetic powder drops from the valve body, makes the magnetic powder drop in processing chamber bottom, and second cylinder (161) promote first ejector pad (15) forward motion, and first ejector pad (15) pushes the magnetic powder of processing chamber bottom to first opening part, makes the magnetic powder of processing chamber bottom drop in storage chamber (17) from first opening part, retrieves the magnetic powder of processing chamber bottom.
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