Air tightness detection device for precision castings

Abstract

The present invention relates to the field of casting detection technology, and in particular to an airtightness detection device for precision castings, including a support frame and a mounting plate, etc.; two support frames are connected to the mounting plate. Low-temperature liquid is transported to the casting, and the casting is already full of liquid. When the remaining liquid continues to be transported, the water pressure in the casting will be pressurized, and then when a gap appears in the casting, the liquid will flow out from the gap, so as to judge whether the airtightness of the casting will have problems when the casting is in a low-temperature shrinkage state, thereby improving the accuracy and reliability of airtightness detection, and then ensuring the production quality of its castings; by cooling the inner and outer walls of the casting at the same time, the casting can be quickly cooled to the temperature of the shrinkage state; the leaking position is marked by liquid, and the leaking position is accurately judged, which is convenient for subsequent maintenance personnel to quickly locate and repair in a targeted manner, avoiding blind disassembly to find leaks, saving time and cost.

Description

Technical Field

[0001] The invention relates to the technical field of casting detection, and in particular to an air tightness detection device for precision castings. Background Art

[0002] Castings are metal objects obtained by various casting methods, that is, the smelted liquid metal is poured into a pre-prepared mold by pouring, injection, suction or other casting methods, and after cooling and subsequent processing such as grinding, the resulting object has a certain shape, size and performance;

[0003] When castings are actually used, they will expand due to heat and contract due to cold, especially for castings that need to be assembled together, such as water pumps, valves and water pipes. The shrinkage of castings will cause their dimensions to change, affecting the gap between the sealing interface or the connection parts and changing the original matching size relationship. This may cause parts that were originally leak-proof at room temperature to leak in the cold state. However, when testing existing castings, only castings at room temperature are tested, and it is impossible to test according to actual usage conditions. This may easily lead to castings that pass the factory inspection but leak during use, thus affecting the reputation of the product. Summary of the invention

[0004] In order to overcome the disadvantage that the existing castings are only tested at room temperature and cannot be tested according to actual usage, which easily leads to qualified testing at the factory but leakage during use, the present invention provides an airtightness testing device for precision castings.

[0005] The technical solution of the present invention is: an air tightness detection device for precision castings, including a support frame and a mounting plate; two support frames are commonly connected to the mounting plate; also including a placement plate, an air pipe, a mounting plate, a fixed plate, an electric push rod and a connecting pipe; the mounting plate is connected to a plurality of placement plates, each of which is provided with a plurality of air outlets; the mounting plate is fixedly connected to the air pipe; the air pipe is connected to the air outlet of each placement plate; the mounting plate is fixedly connected to two fixing plates; each fixing plate is fixedly connected to two electric push rods; all the telescopic parts of the electric push rods on the same fixing plate are commonly fixedly connected to a connecting pipe, and the electric push rod is connected to an external power supply.

[0006] Furthermore, the air outlet holes located on the outside are inclined toward the middle of the placement plate.

[0007] Furthermore, it also includes compression springs and vibration motors; each support frame and the mounting plate are fixedly connected with a plurality of compression springs; a vibration motor is fixedly connected to each side of the mounting plate, and the vibration motor is connected to an external power supply.

[0008] Furthermore, it also includes a silicone pad; a silicone pad is fixedly connected to the upper part of each placement plate.

[0009] Furthermore, it also includes a swing plate and a torsion spring; each of the two sides of each placement plate is rotatably connected to a swing plate; the rotation part of each swing plate and the placement plate are fixedly connected to two torsion springs.

[0010] Furthermore, it also includes an air intake pipe; each swing plate is fixedly connected with an air intake pipe; all the air intake pipes are connected with the air supply pipe, each swing plate is provided with a plurality of jet holes, and the jet holes are connected with the air intake pipe.

[0011] Furthermore, the air outlet and the jet hole are both trumpet-shaped.

[0012] Furthermore, it includes a silicone sleeve, and each connecting pipe is fixedly connected with a silicone sleeve.

[0013] Furthermore, it also includes an electric rotating roller and a pull rope; each placement plate is fixedly connected to the right part with an electric rotating roller; each electric rotating roller is rolled up with a pull rope; each pull rope is fixedly connected to the adjacent swing plate.

[0014] Furthermore, it also includes an electric push rod 2; each placement plate is fixedly connected to two electric push rods 2; all electric push rods 2 are fixedly connected to the mounting plate; and the telescopic part of the electric push rod 2 is fixedly connected to the placement plate.

[0015] The beneficial effects are:

[0016] Low-temperature liquid is delivered to the casting, which is already full of liquid. When the remaining liquid continues to be delivered, the water pressure in the casting will be increased. Then when cracks appear in the casting, the liquid will flow out from the cracks, so as to judge whether there will be problems with the airtightness of the casting when it shrinks at low temperature, thereby improving the accuracy and reliability of airtightness detection, and then ensuring the production quality of the casting; by cooling the inner and outer walls of the casting at the same time, the casting can be quickly cooled to the temperature of the shrinkage state.

[0017] The leak location can be marked with liquid to accurately determine the leak location, making it easier for subsequent maintenance personnel to quickly locate and carry out targeted repairs, avoiding blind disassembly to search for leaks, saving time and costs.

[0018] Based on the above, when multiple leaking castings are detected, the positions of the dark liquid marks can be compared. When the mark positions are the same or close, it means that there are problems in the manufacturing process. Therefore, the manufacturing process can be improved accordingly according to the leakage position, so that the quality of subsequent castings can be guaranteed and the defective rate can be reduced.

[0019] When the vibration motor is turned on, it will drive the placement plate and casting to vibrate through the mounting plate. At this time, the temperature of the casting becomes lower, thereby simulating the scene when the casting is transported at low temperature. At this time, the water supply in the casting is tested through the connecting pipe to detect whether there will be leakage during transportation, so that the castings leaving the factory will not crack during low-temperature transportation, thereby ensuring its product quality.

[0020] When the swing plate swings, it will pull the two sides of the placement plate to swing up and down, thereby enhancing the vibration effect of the placement plate; the swing plate is in a swinging state, so that the ejected cold air is also in a swinging state, avoiding the air jet holes from only ejecting air from a fixed area of ​​the casting, so that more areas of the casting are in contact with the cold air, making the casting cool down faster, shortening the time required for the casting to cool down to the detection temperature, and reducing the waiting time for subsequent casting detection, so as to improve the detection efficiency of the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the air tightness detection device for precision castings disclosed by the present invention from a first viewing angle;

[0022] Figure 2 A schematic diagram of the structure of the air tightness detection device for precision castings disclosed by the present invention from a second viewing angle;

[0023] Figure 3 The present invention is a cross-sectional view of the combined structure of the placement plate, the mounting plate and the swing plate disclosed in the air tightness detection device for precision castings.

[0024] The names and serial numbers of the parts in the figure are: 1-support frame, 2-placing plate, 3-air pipe, 4-mounting plate, 5-silicone pad, 101-fixing plate, 102-electric push rod one, 103-connecting pipe, 111-compression spring, 112-vibration motor, 113-swing plate, 114-torsion spring, 115-inlet pipe, 201-electric rotating roller, 202-pull rope, 203-electric push rod two, 2a-air outlet, 113a-jet hole. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] A device for detecting air tightness of precision castings, such as Figure 1-3 As shown, it includes a support frame 1 and a mounting plate 4; two support frames 1 are commonly connected to the mounting plate 4;

[0027] It also includes a placement plate 2, an air pipe 3, a mounting plate 4, a fixed plate 101, an electric push rod 102 and a connecting pipe 103; the mounting plate 4 is connected to six placement plates 2, each of which is provided with six air outlets 2a; the mounting plate 4 is fixedly connected to the air pipe 3; the air pipe 3 is connected to the air outlet 2a of each placement plate 2; the mounting plate 4 is fixedly connected to two front and rear distributed fixed plates 101; each fixed plate 101 is fixedly connected to two electric push rods 102; all the telescopic parts of the electric push rods 102 on the same fixed plate 101 are fixedly connected to a connecting pipe 103, and the electric push rods 102 are connected to an external power supply.

[0028] The air outlet holes 2a located on the outside are inclined toward the middle of the placement plate 2 to prevent the cold air ejected from the air outlet holes 2a from contacting the casting when the casting is small in size.

[0029] It also includes compression springs 111 and vibration motors 112; each support frame 1 and the mounting plate 4 are fixedly connected with three compression springs 111; the front and rear sides of the mounting plate 4 are each fixedly connected with a vibration motor 112, and the vibration motor 112 is connected to an external power supply.

[0030] It also includes a silicone pad 5; each placement plate 2 is fixed with a silicone pad 5 on the upper part, and the rubber strip allows the casting to have soft contact during vibration, thereby preventing the outer surface from being damaged and affecting sales.

[0031] It also includes a swing plate 113 and a torsion spring 114; each of the left and right sides of the placement plate 2 is rotatably connected to a swing plate 113; the rotation part of each swing plate 113 and the placement plate 2 are fixedly connected to two torsion springs 114.

[0032] It also includes an air intake pipe 115 ; each swing plate 113 is fixedly connected with an air intake pipe 115 ; all the air intake pipes 115 are connected to the air supply pipe 3 , and each swing plate 113 is provided with six injection holes 113 a , which are connected to the air intake pipe 115 .

[0033] The air outlet 2a and the air injection hole 113a are both trumpet-shaped, so that the cold air is sprayed out in a diffused state, thereby increasing the contact area between the cold air and the casting.

[0034] Including a silicone sleeve, each connecting pipe 103 is fixedly connected with a silicone sleeve.

[0035] The specific working steps are:

[0036] The air delivery pipe 3 is connected to an external cold air delivery device, and the connecting pipe 103 is connected to an external water delivery device. The external water delivery device delivers low-temperature liquid, and the low-temperature liquid is a saline solution, so it will not freeze when the temperature is below degrees.

[0037] When the casting needs to be tested for air tightness, the casting is first placed on the placement plate 2, and then the electric push rod 102 is controlled to push the connecting pipe 103 to move toward the casting, and the connecting pipe 103 is inserted into the feed port and the discharge port of the casting, and then the front external water supply equipment starts to transport low-temperature liquid, so that the liquid enters the casting through the connecting pipe 103, and then the rear external water supply equipment draws the low-temperature liquid in the casting away, so that the low-temperature liquid flows inside the casting, and at the same time the external cold air delivery equipment will deliver cold air, so that the cold air enters the placement plate 2 through the air delivery pipe 3, and then sprays out from the air outlet 2a, and the sprayed cold air will contact the outside of the casting, and the inner and outer walls of the casting are cooled simultaneously, so that the casting can be quickly cooled. The casting is rapidly cooled to a temperature of a shrinkage state. When the temperature of the casting is lowered, the rear peripheral water supply device will no longer pump water, but will transport low-temperature liquid to the casting together with the front peripheral water supply device. The casting is already full of liquid. When the remaining liquid continues to be fed in, the water pressure in the casting will be pressurized. Then, when cracks appear in the casting, the liquid will flow out from the cracks, so as to judge whether the air tightness of the casting will have problems when the casting is in a low-temperature shrinkage state, thereby improving the accuracy and reliability of the air tightness detection, and then ensuring the production quality of the casting. After the detection, the rear peripheral water supply device will pump out the liquid, and then the electric push rod 102 will push the connecting pipe 103 to separate from the casting, and then the casting will be taken out and the residual accumulated liquid inside it will be poured out.

[0038] The low-temperature liquid transported by the external water supply equipment is a dark liquid. When the liquid flows out of the casting, it can be quickly discovered, so as to quickly determine whether there is a leak. After the leak location is quickly determined, the external water supply equipment is immediately controlled to stop supplying water to the connecting pipe 103, and the water in the casting is pumped out through the connecting pipe 103. This can avoid the failure to quickly discover the leak problem, which leads to excessive liquid outflow and a large amount of liquid adhering to the surface of the casting, making it impossible to determine the leak location. The leak location is marked with liquid and accurately determined, which is convenient for subsequent maintenance personnel to quickly locate and repair it in a targeted manner, avoiding blind disassembly to search for leaks, saving time and costs.

[0039] Based on the above, when multiple leaking castings are detected, the positions of the dark liquid marks can be compared. When the mark positions are the same or close, it means that there are problems in the manufacturing process. Therefore, the manufacturing process can be improved accordingly according to the leakage position, so that the quality of subsequent castings can be guaranteed and the defective rate can be reduced.

[0040] Since the casting is at low temperature, especially close to or below °C, it will shrink, which will affect the structural performance of the casting, making the casting more fragile and prone to cracks or microcracks. If the casting is transported in a cold climate, the bumpy transportation will cause the casting to shake, which will easily cause cracks in the low-temperature transportation of the casting, and then leak when the casting is used later. Therefore, when the liquid and cold air are used to cool the casting, the vibration motor 112 is turned on. Since the support frame 1 is connected to the mounting plate 4 through the compression spring 111, the vibration motor 112 will be turned on through the mounting plate 4 when it is turned on. The mounting plate 4 drives the placement plate 2 and the casting to vibrate, and at this time the temperature of the casting becomes lower, thereby simulating the scene when the casting is in low-temperature transportation. At this time, the water supply in the casting is detected through the connecting pipe 103, so as to detect whether the casting will leak during transportation, so that the casting shipped out will not crack during low-temperature transportation, thereby ensuring its product quality. It should be noted that the rubber pad will contact the casting, so that when the casting vibrates, it will not directly contact the placement plate 2, so that the casting and the contact object are in soft contact, so that when the casting vibrates, it will not cause damage to the appearance of the casting, thereby not affecting the sales of the casting.

[0041] When the placing plate 2 vibrates, it will drive the swinging plate 113 to shake. Since the swinging plate 113 is connected to the placing plate 2 by the torsion spring 114, the swinging plate 113 will swing left and right when shaking, and the swinging plate 113 will pull the two sides of the placing plate 2 to swing up and down when swinging, thereby enhancing the vibration effect of the placing plate 2; and the cold air in the air supply pipe 3 will enter the inside of the swinging plate 113 through the air inlet pipe 115, and finally be ejected from the air jet hole 113a. At this time, the cold air ejected from the air outlet hole 2a and the air jet hole 113a will be sprayed toward the casting in a surrounding shape, so that more areas of the casting are in contact with the cold air, thereby accelerating the cooling speed of the casting. At this time, since the swinging plate 113 is in a swinging state, the ejected cold air is also in a swinging state, avoiding the air jet hole 113a from only ejecting air from a fixed area of ​​the casting, so that more areas of the casting are in contact with the cold air, so that the casting is cooled faster, the time required for the casting to cool down to the detection temperature is shortened, and the waiting time for subsequent casting detection is reduced, so as to improve the detection efficiency of the casting.

[0042] It should be noted that although the mounting plate 4 will drive the fixing plate 101, the electric push rod 102 and the connecting pipe 103 to vibrate along with the casting, the connecting pipe 103 and the casting are not fixedly connected, and the vibrations between the two cannot be completely synchronous, which can easily lead to collision between the connecting pipe 103 and the casting. Therefore, a silicone sleeve is provided in the contact area between the connecting pipe 103 and the casting. When the connecting pipe 103 is inserted into the casting, the silicone sleeve will be in an extruded state to ensure that the connecting port is in a sealed state, and the silicone sleeve will play a shock-absorbing role during vibration to avoid collision between the two.

[0043] On the basis of Example 1, Figure 2-3As shown, it also includes an electric rotating roller 201 and a pull rope 202; each placement plate 2 has an electric rotating roller 201 fixedly connected to the right part; each electric rotating roller 201 has a pull rope 202 wound up; each pull rope 202 is fixedly connected to the adjacent swing plate 113.

[0044] It also includes an electric push rod 203; each placement plate 2 is fixedly connected to two electric push rods 203; all electric push rods 203 are fixedly connected to the mounting plate 4; the telescopic part of the electric push rod 203 is fixedly connected to the placement plate 2.

[0045] The specific working steps are:

[0046] When the casting is placed on the placement and connected to the connecting pipe 103, the swing plate 113 will cause an obstruction. Therefore, when the casting is placed and taken out, the electric rotating roller 201 rotates to reel in the pull rope 202, thereby pulling the left swing plate 113 to rotate clockwise when viewed from the front and back, and the torsion spring 114 will be in a compressed state, so that the connecting pipe 103 is tilted downward, thereby facilitating the placement and removal of the casting. When cooling and vibrating, the electric rotating roller 201 is rotated to release the pull rope 202. At this time, the compressed torsion spring 114 will rebound to drive the swing plate 113 to rotate back to its original position, and the pull rope 202 will also be in a loose state, so that the swing plate 113 is not affected by the pull rope 202 when it swings.

[0047] The rubber pad will fit tightly against the bottom of the casting, which may easily cause the gap to be blocked, making it impossible for liquid to flow out of the gap, thereby affecting the detection result. Each placement plate 2 is fixedly connected to the telescopic part of the electric push rod 203, so that the electric push rod 203 can drive the placement plate 2 to move downward or upward. Therefore, during detection, the front placement plate 2 is driven down by the electric push rod 203 so as not to contact the casting. When no contact is found after descending, the front placement plate 2 is controlled to rise, and then the next placement plate 2 is controlled to fall. This is repeated repeatedly, which can support the casting while avoiding the problem of partial area of ​​the casting contacting with the rubber strip during detection, which may lead to detection errors.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An air tightness detection device for precision castings, characterized in that: The invention comprises a support frame (1) and a mounting plate (4); two support frames (1) are connected to the mounting plate (4); the mounting plate (4) further comprises a placement plate (2), an air delivery pipe (3), a mounting plate (4), a fixing plate (101), an electric push rod (102) and a connecting pipe (103); the mounting plate (4) is connected to a plurality of placement plates (2), each placement plate (2) being provided with a plurality of air outlet holes (2a); the mounting plate (4) is fixedly connected to the air delivery pipe (3); the air delivery pipe (3) is connected to an external cold air delivery device, and the connecting pipe (103) is connected to an external water delivery device. The equipment is connected, and the external water supply equipment delivers low-temperature liquid, and the low-temperature liquid is a salt water solution; the gas supply pipe (3) is connected to the air outlet (2a) of each placement plate (2); the gas ejected from the air outlet (2a) is cold air; the installation plate (4) is fixedly connected to two fixed plates (101); each fixed plate (101) is fixedly connected to two electric push rods (102); the telescopic parts of all the electric push rods (102) on the same fixed plate (101) are fixedly connected to a connecting pipe (103), and the electric push rods (102) are connected to the external power supply; It also includes a swing plate (113) and a torsion spring (114); each of the two sides of each placement plate (2) is rotatably connected to a swing plate (113); the rotation part of each swing plate (113) and the placement plate (2) are fixedly connected to two torsion springs (114); It also includes an air intake pipe (115); each swing plate (113) is fixedly connected to an air intake pipe (115); all the air intake pipes (115) are in common communication with the air delivery pipe (3); each swing plate (113) is provided with a plurality of air injection holes (113a), and the air injection holes (113a) are in communication with the air intake pipe (115); When the placement plate (2) vibrates, it drives the swing plate (113) to vibrate. Since the swing plate (113) and the placement plate (2) are connected via a torsion spring (114), the swing plate (113) swings left and right when it vibrates. When the swing plate (113) swings, it pulls the placement plate (2) to swing up and down, thereby enhancing the vibration effect of the placement plate (2). In addition, the cold air in the air delivery pipe (3) enters the swing plate (113) through the air inlet pipe (115). , and finally ejected from the air jet hole (113a). At this time, the cold air ejected from the air outlet hole (2a) and the air jet hole (113a) will be ejected toward the casting in a surrounding shape, so that more areas of the casting are in contact with the cold air, thereby accelerating the cooling speed of the casting. In addition, since the swing plate (113) is in a swinging state at this time, the ejected cold air is also in a swinging state, which prevents the air jet hole (113a) from only ejecting air to a fixed area of ​​the casting, so that more areas of the casting are in contact with the cold air, and the casting is cooled faster.

2. The air tightness detection device for precision castings according to claim 1, characterized in that: The air outlet holes (2a) located on the outside are inclined toward the middle of the placement plate (2).

3. The air tightness detection device for precision castings according to claim 1, characterized in that: It also includes compression springs (111) and vibration motors (112); each support frame (1) and the mounting plate (4) are fixedly connected to a plurality of compression springs (111); a vibration motor (112) is fixedly connected to each of the two sides of the mounting plate (4); and the vibration motor (112) is connected to an external power supply.

4. The air tightness detection device for precision castings according to claim 1, characterized in that: It also includes a silicone pad (5); a silicone pad (5) is fixedly connected to the upper part of each placement plate (2).

5. An air tightness detection device for precision castings according to any one of claims 1 to 4, characterized in that: The air outlet (2a) and the air jet hole (113a) are both trumpet-shaped.

6. The air tightness detection device for precision castings according to claim 1, characterized in that: It comprises a silicone sleeve, and each connecting pipe (103) is fixedly connected to a silicone sleeve.

7. The air tightness detection device for precision castings according to claim 6, characterized in that: It also includes an electric rotating roller (201) and a pull rope (202); each placement plate (2) is fixedly connected to the right part with an electric rotating roller (201); each electric rotating roller (201) is rolled up with a pull rope (202); and each pull rope (202) is fixedly connected to an adjacent swing plate (113).

8. The air tightness detection device for precision castings according to claim 7, characterized in that: It also includes electric push rods 2 (203); each placement plate (2) is fixedly connected to two electric push rods 2 (203); all electric push rods 2 (203) are fixedly connected to the mounting plate (4); and the telescopic part of the electric push rods 2 (203) is fixedly connected to the placement plate (2).

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