Airtightness detection tool

Abstract

The utility model relates to the technical field of detection equipment, and particularly discloses an air tightness detection tool, which comprises a bottom plate and an external plugging assembly, the external plugging assembly comprises a side plugging assembly, and the side plugging assembly comprises a side plugging structure capable of being close to or far away from a workpiece side design hole. The top abutting assembly presses the workpiece downwards from the top, the internal supporting assembly provides upward supporting force for the workpiece from the interior of the workpiece, the top abutting assembly comprises a plurality of pressing rods which are close to the workpiece and then press the workpiece, and the internal supporting assembly is located among the multiple pressing rods; the internal supporting assembly comprises a fixedly-installed sealing support and an internal sealing structure fixed to the top of the sealing support, and the internal sealing structure is an elastic sealing gasket or an elastic sealing ring and used for blocking the bottom end of a design hole in the top of the workpiece. The technical scheme is used for solving the problem that the product quality is affected by the pressing force borne by the non-supporting position in the middle of the workpiece due to the fact that a design hole formed in the top of the middle of the cavity is blocked in a pressing mode.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, and particularly relates to an airtight detection tooling. Background Technique

[0002] For products with cavities that require high airtightness, airtightness detection is usually carried out before leaving the factory or before use to ensure product quality. For example, die-cast aluminum alloy products are prone to defects such as gas shrinkage holes and cracks during the die-casting process. Therefore, products with airtightness requirements usually need to pass an airtightness test to determine whether they are qualified. In the prior art, there are mainly two ways of airtightness detection: dry air detection and wet water detection. In wet water detection, it is necessary to first use an airtight detection tooling to press the workpiece tightly and block each communication hole connecting the workpiece cavity to ensure that when immersed in water, the air pressure injected into the workpiece cavity will not leak from the blocking position (the end face of the designed hole). Then, the position of die-casting defects is determined by observing the position where bubbles are generated in the water.

[0003] Currently, the general airtight detection tooling usually sets a blocking component on the periphery according to the structure of the workpiece. For example, the workpiece has designed holes communicating with the cavity on the side, top, and bottom. The conventional blocking method is to set an elastic blocking plate, an elastic sealing gasket, or an elastic blocking head on the outside of the workpiece that can approach and tightly press against the corresponding designed hole to achieve blocking the port of the designed hole from the outside. For example, the casting airtight detection tooling equipment with the patent publication number CN210741763U, an airtight detection device with the patent publication number CN218973752U, and an airtight dry detection device with the patent publication number CN221123730U.

[0004] However, when these existing airtight detection toolings block the hole positions of the workpiece, the blocking of the designed hole with a communicating cavity at the top is also carried out from the outside. As a result, all the forces applied to the workpiece are inward extrusion forces from the outside. Especially in the case where a single cavity of the workpiece is very large and there is a designed hole at the top of the middle area of the cavity, simply pressing the top designed hole downward will cause more uneven local stress on the workpiece, thus affecting the quality of the workpiece.

[0005] In addition, after the wet airtight detection is completed, as the water level drops, although most of the water will flow away due to its own weight, since the bottom plate size of the detection tooling is usually much larger than the workpiece, it is difficult to quickly drain the water on the bottom plate. Content of the Utility Model

[0006] The utility model aims to provide an airtight detection tooling to solve the problem that the downward pressure on the unsupported position in the middle of the workpiece caused by pressing the designed hole set at the top of the middle part of the cavity affects the product quality.

[0007] To achieve the above purpose, the utility model adopts the following technical scheme:

[0008] An airtight detection tooling, comprising a bottom plate and an external sealing component. The external sealing component includes a side sealing component. The side sealing component includes a side sealing structure that can approach or move away from the designed hole on the side of the workpiece. It also includes a top pressing component that presses the workpiece downward from the top and an internal supporting component that provides an upward supporting force to the workpiece from inside the workpiece. The top pressing component includes a plurality of pressing rods that press the workpiece tightly after approaching the workpiece. The internal supporting component is located between the plurality of pressing rods. The internal supporting component includes a fixedly installed sealing support and an internal sealing structure fixed on the top of the sealing support. The internal sealing structure is an elastic sealing gasket or an elastic sealing ring. The internal sealing structure is used to block the bottom end of the designed hole at the top of the workpiece.

[0009] The principle and advantages of this solution are as follows: When adopting this solution, the workpiece is supported from the inside of the cavity of the workpiece through the internal supporting component, and the workpiece is supported from the inside of the cavity of the workpiece through the internal supporting component, so as to ensure that during the airtight detection process of the workpiece, the pressing rods press the workpiece tightly from multiple positions around, the side sealing component blocks the designed hole on the side of the workpiece from the side of the workpiece, and while the internal sealing component provides internal support to the workpiece, the top designed hole communicating with the cavity is also blocked by the internal sealing structure. The entire solution improves the uniformity of the force on the workpiece through the combined use of the internal supporting component and the top pressing component, and avoids quality problems caused by uneven local force.

[0010] Preferably, as an improvement, the external sealing component further includes a bottom sealing component. The bottom sealing component includes a fixedly installed backing plate and an annular sealing strip fixed on the backing plate. The annular sealing strip is used to enclose and seal the designed hole of the workpiece facing the backing plate. An annular sealing groove for placing the annular sealing strip is provided on both the workpiece and the backing plate. The annular sealing strip has elasticity.

[0011] Beneficial effect: Through the setting of the annular sealing strip, when blocking the opening of the bottom designed hole, it does not directly block the opening, but places the annular sealing strip in the form of an annular sealing groove provided on the outer periphery of the designed hole, and makes the annular sealing strip sink into the upper and lower annular sealing grooves at the same time, so as to improve the sealing performance of the bottom designed hole of the workpiece.

[0012] Preferably, as an improvement, the side sealing structure includes an elastic sealing gasket or an elastic sealing ring or an elastic sealing plug.

[0013] Preferably, as an improvement, a plurality of drain holes are provided on the bottom plate. The axial direction of the drain holes is vertical. Through the design of the drain holes, it is convenient to quickly drain water after the airtight detection is completed.

[0014] Preferably, as an improvement, a drain ring groove is provided at the edge of the bottom plate. The drain ring groove communicates with the drain holes passing through the drain ring groove to further improve the drainage effect.

[0015] Preferably, as an improvement, the bottom plate includes an upper bottom plate and a lower bottom plate, and the upper bottom plate and the lower bottom plate are detachably connected to facilitate airtight detection of different products by replacing the upper bottom plate.

[0016] Preferably, as an improvement, the pressure rod includes a fixed sleeve, a sliding rod slidably mounted at one end on the fixed sleeve, and a pressure rod body detachably connected to the other end of the sliding rod. All the fixed sleeves are fixed on the top plate, and the top plate can be lifted and lowered under the drive of a driver. The pressure rod is an elastic pressure rod, and the elastic member on the pressure rod is arranged at least at any position between the sliding rod and the top plate / fixed sleeve, and between the pressure rod body and the fixed sleeve / top plate.

[0017] Beneficial effects: When adopting this solution, when the pressure rod moves close to the workpiece along with the top plate, the pressure rod first contacts the workpiece, and then under the continuous movement of the top plate, the elastic force of the elastic member is overcome and the pressing force on the workpiece gradually increases, avoiding damage to the workpiece caused by the sudden pressing of the pressure rod; in addition, the pressure rod is provided with multiple parts, which facilitates the replacement of a single part after a local part of the pressure rod is damaged, reducing the maintenance cost and replacement cost.

[0018] Preferably, as an improvement, the sliding rod is a pull stud, the head of the pull stud is slidably connected in the fixed sleeve, the body of the pull stud penetrates through the fixed sleeve and the bottom end is threadedly connected to the pressure rod body, and the elastic member is sleeved on the pull stud to further reduce costs.

[0019] Preferably, as an improvement, a cushion block is detachably connected to the bottom end of the pressure rod body for contacting the workpiece, and the cushion block is threadedly connected to the bottom end of the pressure rod body. Through the setting of the cushion block, it is convenient to adjust the thickness of the cushion block according to the specific structure of the workpiece to ensure the uniformity of the pressing force of each pressure rod on the workpiece.

[0020] Preferably, as an improvement, a plurality of support rods facing the bottom plate are fixedly connected to the top plate, and support columns facing the support rods are fixed on the bottom plate. The support rods are used to abut against the support columns, and at least one pair of diagonal support rods and support columns are in concave-convex fit. When adopting this solution, the maximum descending stroke of the top plate can be limited by the support rods and the support columns, avoiding the situation that the top plate descends too much and presses the workpiece, and the guiding during the descending process of the top plate is realized through the concave-convex fit of the diagonal support rods and the support columns, ensuring the axial stability during descending. Description of the Drawings

[0021] Figure 1 It is a three-dimensional structure diagram of the die-cast workpiece targeted by the embodiment of the present invention (the right view is flipped 180° relative to the left).

[0022] Figure 2 is Figure 1 a top view of the left side view in

[0023] Figure 3 It is a three-dimensional structure schematic diagram of an embodiment of the present utility model (the state where the upper top plate descends to the bottommost position and no workpiece is placed).

[0024] Figure 4 is Figure 3 the front view of...

[0025] Figure 5 is Figure 3 the three-dimensional structure schematic diagram after the middle top plate rises in...

[0026] Figure 6 is Figure 5 the front view of...

[0027] Figure 7 This is a three-dimensional structure schematic diagram of this embodiment, only showing the bottom plate and the internal support assembly, side sealing assembly, and bottom sealing assembly installed on the bottom plate.

[0028] Figure 8 is Figure 7 the top view of...

[0029] Figure 9 is Figure 7 the three-dimensional structure schematic diagram after the workpiece is placed in... (where the side design hole of the side sealing assembly has not been sealed yet).

[0030] Figure 10 This is an axial sectional view of the present utility model embodiment to show the structure of the pressure rod. Specific Embodiments

[0031] The following is a further detailed description through specific embodiments:

[0032] The reference numerals in the accompanying drawings of the specification include: bottom plate 1, drain hole 11, drain ring groove 12, support column 13, top plate 2, top pressing assembly 20, pressure rod 21, fixed sleeve 211, pull nail 212, pressure rod body 213, cushion block 214, spring 215, support rod 22, guide post 23, internal support assembly 3, sealing support 31, internal sealing structure 32, side sealing assembly 4, side sealing structure 41, elastic sealing pad 411, elastic sealing ring 412, elastic sealing plug 413, linear actuator 42, bottom sealing assembly 5, backing plate 51, annular sealing strip 52, open positioning ring 53, positioning pin 54, workpiece 10, side design hole 103, top surface design hole 102, cavity 101.

[0033] The embodiment is basically as shown in the appendix Figures 3 to 10 shown.

[0034] An airtight detection tooling, comprising a fixed bottom plate 1, a lifting top plate 2, an external plugging component for plugging the designed holes of the workpiece 10 from the outside of the workpiece 10, a top pressing component 20 for pressing the workpiece 10 against the bottom plate 1 from the top, and an internal support component 3 for providing an upward supporting force to the workpiece 10 from inside the workpiece 10.

[0035] The external plugging component includes a plurality of side plugging components 4. The side plugging component 4 includes a side plugging structure 41 that can approach or move away from the side designed hole 103 of the workpiece 10. Some side plugging components 4 are fixed on the bottom plate 1. For the side plugging components 4 that need to stack and plug the side designed holes 103, the number of side plugging components 4 is set to two stacked vertically. Among them, the lower side plugging component 4 is installed on the bottom plate 1, and the upper side plugging component 4 is installed under the top plate 2, so that the height space of the detection tooling is reasonably utilized, and the maintenance and adjustment of the side plugging components 4 stacked up and down are facilitated.

[0036] The side plugging structure 41 of each side plugging component 4 is driven by a correspondingly fixedly installed linear actuator 42 to move away from or close to the corresponding side designed hole 103. In this embodiment, the linear actuator 42 adopts an oil cylinder, and the moving direction of the output end of the linear actuator 42 is in the horizontal plane.

[0037] The side plugging structure 41 includes an elastic sealing gasket 411 or an elastic sealing ring 412 or an elastic sealing plug 413. The selection of the side plugging structure 41 is reasonably selected according to the side designed hole 103 of the workpiece 10. When a sealing ring groove is originally designed on the outer periphery of the side designed hole 103, the side plugging structure 41 preferably adopts the form of an elastic sealing ring 412 to better simulate the actual use situation and plug the side designed hole 103. When the side designed hole 103 is a large round hole, an elastic sealing plug 413 is adopted. The elastic sealing plug 413 has a frustum structure, and the frustum structure of the elastic sealing plug 413 can be inserted into the designed hole on the cylinder and abuts against the edge of the designed hole with the frustum structure to form the plugging of this type of designed hole. When the side designed hole 103 is a stepped hole, an elastic sealing gasket 411 is adopted for plugging, and the elastic sealing gasket 411 abuts against the stepped surface for plugging.

[0038] The external plugging component further includes a bottom plugging component 5. The bottom plugging component 5 includes a fixedly installed backing plate 51 and an annular sealing strip 52 fixed on the backing plate 51. The annular sealing strip 52 is used to enclose and seal the designed hole of the workpiece 10 facing the backing plate 51. Annular sealing grooves for placing the annular sealing strip 52 are provided on both the workpiece 10 and the backing plate 51, and the annular sealing strip 52 has elasticity.

[0039] The top pressing assembly 20 includes a plurality of pressing rods 21 that are close to the workpiece 10 and press the workpiece 10 from behind. All the pressing rods 21 are fixed on the top plate 2, and all the pressing rods 21 move up and down with the lifting and lowering of the top plate 2. The internal support assembly 3 is located between the plurality of pressing rods 21.

[0040] The pressing rod 21 includes a fixed sleeve 211, a pull stud 212 whose head is slidably connected inside the fixed sleeve 211, a pressing rod body 213 threadedly connected to the bottom end of the pull stud 212, and a cushion block 214 threadedly connected to the bottom end of the pressing rod body 213. All the fixed sleeves 211 are fixed on the top plate 2. The top plate 2 can be lifted and lowered driven by a driver. The body of the pull stud 212 passes through the fixed sleeve 211 and its bottom end is threadedly connected to the pressing rod body 213. An elastic member is sleeved on the pull stud 212. The elastic member is a spring 215. The top end of the spring 215 abuts against the bottom end of the fixed sleeve 211, and the elastic bottom end abuts against the top end of the pressing rod body 213. When this embodiment is adopted, when the pressing rod 21 moves close to the workpiece 10 with the top plate 2, the pressing rod 21 first contacts the workpiece 10, and then, with the continuous movement of the top plate 2, the pressing force on the workpiece 10 gradually increases by overcoming the elastic force of the elastic member, avoiding damage to the workpiece 10 caused by the sudden pressing of the pressing rod 21 against the workpiece 10. In addition, the pressing rod 21 is provided with multiple parts, which is convenient for replacing a single part after a local part of the pressing rod 21 is damaged, reducing the maintenance cost and replacement cost.

[0041] The internal support assembly 3 includes a sealing support 31 fixedly installed on the bottom plate 1 and an internal sealing structure 32 fixed on the top of the sealing support 31. The internal sealing structure is an elastic sealing gasket 411 or an elastic sealing ring. The internal sealing structure is used to seal the bottom end of the designed hole at the top of the workpiece 10. In this embodiment, the internal sealing structure adopts an elastic sealing ring. The elastic sealing strip can be embedded into the sealing groove provided around the designed hole at the top of the workpiece 10 to improve the sealing effect on the workpiece 10.

[0042] To facilitate the quick placement of the workpiece 10 on the inspection fixture, an open positioning ring 53 and a positioning pin 54 are fixedly installed on the backing plate 51. The open positioning ring 53 is U-shaped. A guiding inclined surface is provided on the inner side wall of the open positioning ring 53 facing the workpiece 10. The open positioning ring 53 is used to guide and position the placement of the workpiece 10. The positioning pin 54 is in concave-convex fit with the workpiece 10 to further improve the positioning accuracy of the workpiece 10.

[0043] In this embodiment, a plurality of drain holes 11 are opened on the bottom plate 1. The axial direction of the drain holes 11 is vertical, and the drain holes 11 are provided both at the position close to the backing plate 51 and at the edge position of the bottom plate 1. A drain ring groove 12 is machined at the edge of the bottom plate 1. The drain holes 11 at the edge of the bottom plate 1 are communicated with the drain ring groove 12. Through the design of the drain holes 11 and the drain ring groove 12, it is convenient to quickly drain water after the airtight detection is completed.

[0044] In addition, to facilitate the improvement of the applicability of this embodiment, the bottom plate 1 is designed in the form of an upper bottom plate 1 and a lower bottom plate 1, and the upper bottom plate 1 and the lower bottom plate 1 are detachably connected by bolts.

[0045] In addition, a plurality of support rods 22 facing the bottom plate 1 are fixedly connected to the top plate 2, and a support column 13 facing the support rods 22 is fixed on the bottom plate 1. The support rods 22 are used to abut against the support column 13, and at least one pair of diagonal support rods 22 and support columns 13 are in concave-convex fit. In this embodiment, the number of the support columns 13 and the support rods 22 is 4 each. Guide columns 23 are provided at the bottoms of the support rods 22 at two diagonal positions, and grooves are machined on the corresponding support columns 13. The guide columns 23 can be inserted into the grooves to both guide the descent of the top plate 2 and limit the descent stroke.

[0046] In this embodiment, the top plate 2 can be driven by an oil cylinder fixed on the frame. The top plate 2 is driven to move up and down to facilitate the installation of the workpiece 10 on the bottom plate 1 when rising, and when descending, the pressure rod 21 installed on the top plate 2 presses the workpiece 10 placed on the bottom plate 1 as the top plate 2 descends.

[0047] The operation method of the entire airtight detection tooling when performing airtight detection on the workpiece 10 is as follows:

[0048] S1. Place the workpiece 10 on the bottom plate 1: The top plate 2 is in a state away from the bottom plate 1. At this time, there is enough space between the top plate 2 and the bottom plate 1 to place and take the workpiece 10. Align the workpiece 10 with the open positioning ring 53 and the positioning pin 54, and place the workpiece 10 well.

[0049] S2. Press the workpiece 10 from the top down: Control the top plate 2 to descend until the pressure rod 21 presses the workpiece 10 on the bottom plate 1.

[0050] S3. Control the linear actuator 42 of the side sealing assembly 4 to start, so as to drive the side sealing structure 41 to move towards the side design hole 103 of the workpiece 10 to seal the side design hole 103 of the workpiece 10.

[0051] After filling a certain air pressure into the workpiece 10 clamped and sealed by the airtight detection tooling, the airtight detection tooling is immersed in water with the workpiece 10, and the defect position is determined by observing the bubbling condition on the surface of the workpiece 10.

[0052] The above are only embodiments of the present utility model, and common general technical solutions and / or characteristics in the solutions are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present utility model, several modifications and improvements can be made, which should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. An airtight detection tooling, comprising a bottom plate and an external sealing component. The external sealing component includes a side sealing component. The side sealing component includes a side sealing structure capable of approaching or departing from a design hole on the side of a workpiece, and is characterized in that: It further includes a top pressing component for pressing the workpiece downward from the top and an internal supporting component for providing an upward supporting force to the workpiece from inside the workpiece. The top pressing component includes a plurality of pressing rods that are close to the workpiece and press the workpiece tightly after that. The internal supporting component is located between the plurality of pressing rods. The internal supporting component includes a fixedly installed sealing support and an internal sealing structure fixed on the top of the sealing support. The internal sealing structure is an elastic sealing gasket or an elastic sealing ring, and the internal sealing structure is used to seal the bottom end of the designed hole at the top of the workpiece.

2. The airtight detection tooling according to claim 1, wherein: The external sealing component further includes a bottom sealing component. The bottom sealing component includes a fixedly installed backing plate and an annular sealing strip fixed on the backing plate. The annular sealing strip is used to enclose and seal the designed hole of the workpiece facing the backing plate. An annular sealing groove for placing the annular sealing strip is provided on both the workpiece and the backing plate, and the annular sealing strip is elastic.

3. The airtight detection tooling according to claim 1, characterized in that: The side sealing structure includes an elastic sealing gasket or an elastic sealing ring or an elastic sealing plug.

4. The airtight detection tooling according to claim 1, wherein: A plurality of drain holes are provided on the bottom plate, and the axial direction of the drain holes is vertical.

5. The airtight detection tooling according to claim 4, characterized in that: A drain ring groove is provided at the edge of the bottom plate, and the drain ring groove is communicated with the drain holes passing through the drain ring groove.

6. The airtight detection tooling according to claim 1, wherein: The bottom plate includes an upper bottom plate and a lower bottom plate, and the upper bottom plate and the lower bottom plate are detachably connected.

7. An airtight detection tooling according to any one of claims 1-6, characterized in that: The pressing rod includes a fixed sleeve, a sliding rod whose one end slides on the fixed sleeve, and a pressing rod body detachably connected to the other end of the sliding rod. All the fixed sleeves are fixed on the top plate, and the top plate can be lifted and lowered under the drive of a driver. The pressing rod is an elastic pressing rod, and the elastic member on the pressing rod is arranged at least at any one position between the sliding rod and the top plate / fixed sleeve, and between the pressing rod body and the fixed sleeve / top plate.

8. An airtight detection tooling according to claim 7, characterized in that: The sliding rod is a pull stud, the head of the pull stud is slidably connected in the fixed sleeve, the body of the pull stud passes through the fixed sleeve and the bottom end part is threadedly connected to the pressing rod body.

9. The airtight detection tooling according to claim 7, characterized in that: A cushion block for contacting the bottom end of the workpiece is detachably connected to the pressing rod body, and the cushion block is threadedly connected to the bottom end of the pressing rod body.

10. An airtight detection tooling according to claim 7, characterized in that: A plurality of support rods facing the bottom plate are fixedly connected to the top plate, and support columns facing the support rods are fixed on the bottom plate. The support rods are used to abut against the support columns, and at least one pair of support rods and support columns at the corners are in concave-convex fit.

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