Adjustable sealing device and method for machine body sand cleaning hole water test

Abstract

The invention discloses an adjustable sealing device and method for a machine body sand cleaning hole water test, and belongs to the technical field of casting machining. The sealing device comprises a mounting plate detachably mounted on a machine body; the mounting plate is fixedly connected with the positioning sleeve through a bolt assembly; one end of the positioning sleeve is a cylinder part; the middle of the adjusting shaft is in threaded connection with the positioning sleeve, one end of the adjusting shaft is a cylinder capable of being inserted into the cylinder part, and a circular shoulder is arranged at the tail end of the cylinder; and an O-shaped rubber sealing ring is sleeved on the cylinder. The mounting position of the sealing device can be adjusted, and the sealing device is suitable for plugging the sand cleaning hole in a blank casting state; the groove where the sealing ring is located is dynamic, the sealing effect is improved by extruding the sealing ring, the sealing reliability is high, the structure is simple, and the cost is low.

Description

Technical Field

[0001] The present invention belongs to the technical field of casting processing, and specifically relates to an adjustable sealing device and method for water testing of the sand cleaning holes of the engine block. Background Art

[0002] Through a hydrostatic test, it can be detected whether there is a leakage phenomenon in the inner cavity of the casting under a specified pressure. The sand cleaning hole is a hole deliberately set during the casting process to facilitate the removal of the molding sand in the inner cavity or internal structure of the casting. However, when conducting a hydrostatic test on the water cavity of the engine block, it is difficult to effectively seal the sand cleaning hole. The main reason is that generally, the wall thickness of the blank where the sand cleaning hole is located is relatively thin and the tolerance is large. The end face of the sand cleaning hole is generally a blank surface, and the precision error of the hole wall is relatively large.

[0003] Common plugging methods for sand cleaning holes include: the first one is to use a welded plug plate and then cut off the plug plate after the hydrostatic test. This method causes relatively large damage to the engine block and reduces the service life of the engine block, and is not suitable for castings with relatively thin wall thicknesses; the second one is to perform finish machining on the sand cleaning hole, correct the end face and inner dimensions of the hole, and then install a plug. This method increases the processing cost and reduces the processing efficiency. Similar plugging methods in the prior art, as shown in the patent "A Hydrostatic Test Plugging Device for a Valve Housing Casting" with the publication number CN109186892A, its sealing object is the valve interface. The end face and inner wall dimensions of the valve interface have relatively high precision, and a sealing ring can be sleeved on the plug plate to achieve a sealing effect, but it is not suitable for sealing holes with relatively large tolerances such as sand cleaning holes.

[0004] There are many water cavities distributed on a certain type of water-cooled diesel engine block. The water cavities are located inside the engine block, and there are a large number of sand cleaning holes on the surface of the engine block to facilitate the cleaning of the molding sand. These sand cleaning holes are sealed during the assembly of the diesel engine. The end face of the hole is a blank surface, and an O-ring cannot be used for axial sealing. There is no chamfer at the orifice of the sand cleaning hole. If an O-ring is used for radial sealing of the water hole, the orifice is likely to cut the O-ring when the O-ring enters the hole, resulting in the failure of the O-ring. Therefore, a static O-ring cannot be used for radial sealing of the water hole. As Figure 1 、 2 shown, the theoretical wall thickness of the blank where the sand cleaning hole is located is only 6 mm, and the upper deviation of the size is +3 mm, and the lower deviation is 0. The tolerance zone of the dimension D from the end face of the sand cleaning hole to the engine block lug surface is ±2 mm. To reduce costs, the cylindricity and positional tolerance of the blank hole before machining of the sand cleaning hole are relatively poor. Therefore, during machining, it is often necessary to align and machine according to the center of the blank hole, resulting in a tolerance of ±2 mm for the coordinate dimensions A, B, and C of the sand cleaning hole relative to the side lug screw hole M10 of the engine block. It can be seen that under the premise of controlling the processing cost, without performing finish machining on the sand cleaning hole, a fixed sealing device cannot stably and reliably seal the sand cleaning hole. Summary of the Invention

[0005] In order to overcome the deficiencies in the background art, the present invention provides an adjustable sealing device and method for water testing of the sand cleaning hole of the machine body. The purpose is to adopt an installation base with an adjustable position to adapt to the position error between the sand cleaning hole and the machine body boss, control the plugging component to align with the sand cleaning hole, and then actively extrude the sealing ring through the plugging component to seal the sand cleaning hole, so that it is not necessary to perform precision machining on the sand cleaning hole, reducing the processing cost; after the hydrostatic test, the plugging device can be removed without damaging the machine body, ensuring the service life of the machine body.

[0006] To achieve the above object, the present invention provides the following technical solution: An adjustable sealing device for water testing of the sand cleaning hole of the machine body, including a mounting plate; a group of second through holes are provided on the mounting plate for detachably mounting the mounting plate on the machine body through second screws and covering the upper part of the sand cleaning hole; the mounting plate is fixedly connected to a positioning sleeve through a bolt assembly; one end of the positioning sleeve is provided as a cylindrical part, and the end of the cylindrical part can be inserted into the sand cleaning hole, and its outer wall is in clearance fit with the inner wall of the sand cleaning hole; the middle part of the adjusting shaft is threadedly connected to the positioning sleeve, and one end of it is provided as a cylinder that can be inserted into the cylindrical part, and the outer wall of the cylinder is in clearance fit with the inner wall of the cylindrical part; a circular shoulder is provided at the end of the cylinder; the circular shoulder can be inserted into the sand cleaning hole and is in clearance fit with the inner wall of the sand cleaning hole; an O-ring rubber seal is sleeved on the cylinder, and the O-ring rubber seal is located in the groove formed between the circular shoulder and the end of the cylindrical part; the bolt assembly includes several adjusting gaskets located between the mounting plate and the positioning sleeve for adjusting the axial position of the positioning sleeve; the diameter of the second through hole is 4 to 6 mm larger than the diameter of the second screw.

[0007] As a further optimization, in order to facilitate insertion into the sand cleaning hole, chamfers are provided on the outer edges of the circular shoulder and the end of the cylindrical part.

[0008] As a further optimization, for an exemplary installation structure, a first through hole is provided in the middle of the mounting plate; there are two second through holes, respectively located on the left and right sides of the first through hole; the positioning sleeve includes a flange fixedly connected to one side of the sleeve part, and a plurality of third through holes are provided on the flange; the sleeve part is inserted into the first through hole, and the first screw in the bolt assembly passes through the third through hole and is screwed into the first threaded hole preset on the mounting plate to fixedly connect the positioning sleeve and the mounting plate together; a fourth through hole is provided in the middle of the flange; the middle part of the adjusting shaft passes through the fourth through hole, and an external thread is provided on its outer side; a shoulder nut abutted against the outside of the flange is screwed onto the external thread for threaded connection between the middle part of the adjusting shaft and the positioning sleeve.

[0009] As a further optimization, another implementation of the threaded connection also has the same function; a threaded hole is provided in the middle of the positioning sleeve, and an external thread is provided in the middle of the adjusting shaft for the middle of the adjusting shaft to be threadedly connected to the positioning sleeve.

[0010] As a further optimization, preferably, the diameter of the second through hole is 5 mm larger than the diameter of the second screw.

[0011] As a further optimization, in order to facilitate the screwing of the adjusting shaft, a handle is connected to the end of the adjusting shaft.

[0012] The present invention also provides a method for using an adjustable sealing device for water testing of the sand cleaning hole of the machine body. Using an adjustable sealing device for water testing of the sand cleaning hole of the machine body as described above, it includes the following steps:

[0013] S1: Pre-assembly; Assemble the positioning sleeve, the adjusting shaft, and the O-ring rubber seal together to form a plugging assembly, so that the O-ring rubber seal is clamped in the groove; then assemble the plugging assembly with the mounting plate through the bolt assembly, so that several adjusting gaskets are provided between the mounting plate and the positioning sleeve;

[0014] S2: Pre-installation; Install the mounting plate on the machine body through the second screw passing through the second through hole, but do not tighten the second screw;

[0015] S3: Axial adjustment; After inserting one end of the plugging assembly with the O-ring rubber seal into the sand cleaning hole, according to the position of the O-ring rubber seal, increase or decrease the number of the adjusting gaskets until the O-ring rubber seal is located in the middle position of the hole wall of the sand cleaning hole, and then tighten the bolt assembly to fix the mounting plate and the plugging assembly;

[0016] S4: Radial adjustment; Utilize the gap between the second through hole and the second screw to move the mounting plate. The mounting plate drives the position adjustment of the O-ring rubber seal until the O-ring rubber seal is concentric with the sand cleaning hole, and then tighten the second screw to fix the mounting plate on the machine body;

[0017] S5: Extrude the O-ring rubber seal; Rotate the adjusting shaft. Through the threaded connection between the middle of the adjusting shaft and the positioning sleeve, drive the adjusting shaft to retreat, forcing the groove to narrow and squeeze the O-ring rubber seal. The O-ring rubber seal is radially expanded by the extrusion to seal the sand cleaning hole. Thus, the sand cleaning hole in the rough state with a large tolerance can be sealed.

[0018] As a further optimization, the middle part of the adjusting shaft is threadedly connected to the positioning sleeve through a shoulder nut that abuts against the outside of the flange; the middle part of the adjusting shaft is provided with an external thread and passes through a fourth through hole preset in the middle of the positioning sleeve, and the shoulder nut is screwed onto the external thread in the middle of the adjusting shaft; when adding or reducing the adjusting gasket in step S3, first loosen the shoulder nut and do not install the bolt assembly; there is no axial constraint between the adjusting shaft and the positioning sleeve; the operator first roughly positions the adjusting shaft so that the O-ring is located in the middle position of the wall of the sand cleaning hole, and then pushes the positioning sleeve forward until the end of the cylindrical part abuts against the O-ring. At this time, according to the gap between the positioning sleeve and the mounting plate, select the number of adjusting gaskets, then install the positioning sleeve and the mounting plate together through the bolt assembly, and finally tighten the shoulder nut to preliminarily fix the adjusting shaft; in step S5, the operator controls the adjusting shaft with one hand and controls the shoulder nut with a wrench with the other hand, and rotates one of the adjusting shaft and the shoulder nut to drive the adjusting shaft to retract. This method can set the number of adjusting gaskets more conveniently and quickly.

[0019] The advantages of the present invention are as follows. First, the groove where the O-ring is located is dynamic rather than static, which can drive the O-ring to expand radially to play a sealing role. One O-ring can be accommodated in the groove, so as to adapt to the sealing of the sand cleaning hole in a rough blank state with a large tolerance. Second, after the O-ring expands radially, the pressure exerted on the wall of the sand cleaning hole is large, which can adapt to the higher water pressure required for the hydrostatic test, and the sealing pressure is high. Third, there is no need to perform finish machining on the sand cleaning hole, which reduces costs and improves efficiency; it is not necessary to damage the body due to welding, ensuring the service life of the body. Fourth, when the O-ring seals the sand cleaning hole, the adjusting shaft remains stationary through thread self-locking, with a large self-locking force and high reliability. Fifth, the installation base position of the sealing device is adjustable, and can be adjusted axially and radially, suitable for the situation where the hole position tolerance is large in the casting rough blank state. Sixth, the structure of this device is simple, easy to manufacture, highly reliable, and low in cost.

[0020] In summary, the installation position of the sealing device of the present invention is adjustable, suitable for plugging the sand cleaning hole in the casting rough blank state; the groove where the sealing ring is located is dynamic, and the sealing effect is improved by squeezing the sealing ring, with high sealing reliability, and the structure is simple and the cost is low. Brief Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the sand cleaning hole of the body in the embodiment of the present invention;

[0022] Figure 2 is Figure 1 a partial cross-sectional view of;

[0023] Figure 3 It is a schematic diagram of the working state of the sealing device in the embodiment of the present invention;

[0024] Figure 4 is Figure 3 partial sectional view taken along line B-B;

[0025] Figure 5 is Figure 3 partial sectional view taken along line C-C;

[0026] Figure 6 is a schematic structural view of the mounting plate according to an embodiment of the present invention;

[0027] Figure 7 is a schematic structural view of the positioning sleeve according to an embodiment of the present invention;

[0028] Figure 8 is a schematic structural view of the adjusting shaft according to an embodiment of the present invention.

[0029] In the figure: 1, mounting plate; 2, adjusting gasket; 3, first screw; 4, shoulder nut; 5, adjusting shaft; 6, handle; 7, positioning sleeve; 8, O-ring rubber seal; 9, washer; 10, second screw; 11, body; 101, first through hole; 102, threaded hole; 103, second through hole; 501, cylinder; 502, circular shoulder; 503, toroidal surface; 504, first chamfer; 505, screw rod; 506, light hole; 701, third through hole; 702, fourth through hole; 703, left outer cylindrical surface; 704, inner cylindrical surface; 705, right outer cylindrical surface. Detailed implementation manners

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are only some preferred embodiments of the present invention, rather than all embodiments. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0031] Embodiment; Please refer to Figure 1-8 .

[0032] As Figures 1 to 2 shown, between cylinders B4 and B5 on the side of the diesel engine body in the embodiment of the present invention, there is a sand cleaning hole with a diameter of φ36H8mm, and there are two lugs distributed near the sand cleaning hole, and each lug is provided with a M10 threaded hole.

[0033] As Figures 3 to 8 shown, to solve the above-mentioned sand cleaning hole sealing problem, the present invention proposes an adjustable sealing device for water testing of the sand cleaning hole of the body, which is composed of a mounting plate 1, an adjusting gasket 2, a first screw 3, a shoulder nut 4, an adjusting shaft 5, a handle 6, a positioning sleeve 7, an O-ring rubber seal 8, a washer 9, and a second screw 10.

[0034] A first through hole 101 is distributed at the center of the mounting plate 1, and four threaded holes 102 are evenly distributed along the center of the first through hole 101. The threaded holes 102 are used to mount the first screw 3. According to the positions of the stud holes near the riser holes on the machine body, two second through holes 103 for mounting the second screws 10 are arranged at corresponding positions on the mounting plate 1. The size of the second screw 10 is M10, and the diameter of the second through hole 103 is preferably φ15mm.

[0035] The right end of the positioning sleeve 7 is a circular flange structure. Four third through holes 701 for mounting the first screw 3 are evenly distributed along the center of the positioning sleeve 7 on the circular flange structure. The left end of the positioning sleeve 7 coaxially distributes a left outer cylindrical surface 703, a right outer cylindrical surface 705 and an inner cylindrical surface 704. The left outer cylindrical surface 703 has a clearance fit with the riser hole of the machine body, and the diameter size of the left outer cylindrical surface 703 is preferably φ36f6; the right outer cylindrical surface 705 has a clearance fit with the first through hole 101 at the center of the mounting plate 1, and the fit dimension is preferably φ37H7 / g6mm. The transition between the left end of the left outer cylindrical surface 703 and the left end face of the positioning sleeve 7 is a first fillet, and the radius of the first fillet is preferably R0.4mm. The inner cylindrical surface 704 extends to the right to form a blind hole, and a fourth through hole 702 coaxial with the center of the positioning sleeve 7 is distributed at the center of the bottom of the blind hole.

[0036] The right end of the adjusting shaft 5 is a screw rod 505. A light hole 506 is vertically distributed near the end of the screw rod 505. The light hole 506 is used to mount the handle 6. The left end of the adjusting shaft 5 is a cylinder 501. The cylindrical surface of the cylinder 501 has a clearance fit with the inner cylindrical surface 704 of the positioning sleeve 7, and the fit dimension is preferably φ30.7H7 / f6mm. A first chamfer 504 is arranged at the right end of the cylinder 501, and the size of the first chamfer 504 is preferably 2mm×15°. The left end of the cylinder 501 is a circular shoulder 502 integrated with and coaxial with the cylinder 501. The outer cylindrical surface of the circular shoulder 502 has a clearance fit with the riser hole of the machine body, and the outer diameter of the circular shoulder 502 is preferably φ36e7mm; the transition between the right end annular surface 503 of the circular shoulder 502 and the cylindrical surface of the cylinder 501 is a second fillet, and the radius of the second fillet is preferably R0.5mm. The transition between the annular surface 503 and the outer cylindrical surface of the circular shoulder 502 is a third fillet, and the radius of the third fillet is preferably R0.4mm. A second chamfer is distributed at the left end of the outer cylindrical surface of the circular shoulder 502, and the size of the second chamfer is preferably C0.5mm.

[0037] The O-ring rubber seal 8 is installed in the annular groove formed by the circular ring surface 503 of the adjusting shaft 5 and the left end face of the positioning sleeve 7. The inner diameter of the O-ring rubber seal 8 is φ30 mm, and the cross-sectional diameter of the O-ring rubber seal 8 is φ2.65 mm.

[0038] The adjusting shim 2 has a thickness of 1 mm and a quantity of 6 pieces.

[0039] An adjustment method for an adjustable sealing device for water testing of the sand cleaning hole of the machine body proposed by the present invention:

[0040] Axial position adjustment: To ensure reliable sealing of the sand cleaning hole, it is necessary to ensure that the O-ring rubber seal 8 is located near the middle position in the depth direction of the sand cleaning hole. To achieve the above purpose, it can be realized by adjusting the installation quantity of the adjusting shim 2. Increase or decrease the quantity of the adjusting shim 2 according to the actual position of the sand cleaning hole of the machine body, so as to ensure that the mating length of the outer cylindrical surface 703 of the left section of the positioning sleeve 7 and the sand cleaning hole is more than 2 mm.

[0041] Radial position adjustment: First, position and align the outer cylindrical surface 703 of the left section of the positioning sleeve 7 with the sand cleaning hole, and then install the washer 9 and the second screw 10 to achieve radial position adjustment.

[0042] A usage method for an adjustable sealing device for water testing of the sand cleaning hole of the machine body proposed by the present invention: After the sealing device is installed on the machine body, hold the handle 6 tightly with one hand, and use a wrench to rotate the shoulder nut 4 clockwise with the other hand. The circular ring surface 503 at the left end of the adjusting shaft 5 squeezes the O-ring rubber seal 8 to achieve sealing of the sand cleaning hole of the machine body.

[0043] The advantages of this embodiment are as follows. First, the groove where the O-ring rubber seal 8 is located is dynamic rather than static, which can drive the O-ring rubber seal 8 to expand radially to play a sealing role. One O-ring rubber seal 8 can be accommodated in the groove, so as to adapt to the sealing of the rough state with a large tolerance such as the sand cleaning hole. Second, after the O-ring rubber seal 8 expands radially, the pressure applied to the wall of the sand cleaning hole is large, which can adapt to the higher water pressure required for the hydrostatic test, and the sealing pressure is high. Third, it is not necessary to perform finish machining on the sand cleaning hole, which reduces costs and improves efficiency; it is also not necessary to damage the machine body due to welding, ensuring the service life of the machine body. Fourth, when the O-ring rubber seal 8 seals the sand cleaning hole, the adjusting shaft 5 remains stationary through thread self-locking, with a large self-locking force and high reliability. Fifth, the installation base position of the sealing device is adjustable, and the position can be adjusted axially and radially, which is suitable for the situation where the hole position tolerance is large in the casting rough state. Sixth, the structure of this device is simple, easy to manufacture, highly reliable, and low in cost.

[0044] The parts not described in detail in the present invention are prior art; for those of ordinary skill in the art, the technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable sealing device for water testing of the sand cleaning hole of the body, comprising a mounting plate (1); characterized in that: A set of second through holes (103) are provided on the mounting plate (1) for detachably mounting the mounting plate (1) on the machine body (11) through second screws (10), and covering the above of the sand cleaning hole; the mounting plate (1) is fixedly connected to the positioning sleeve (7) through a bolt assembly; one end of the positioning sleeve (7) is set as a cylindrical part, and the end of the cylindrical part can be inserted into the sand cleaning hole, and the outer wall thereof is in clearance fit with the inner wall of the sand cleaning hole; The middle part of the adjusting shaft (5) is threadedly connected to the positioning sleeve (7), one end of which is set as a cylinder (501) that can be inserted into the cylindrical part, and the outer wall of the cylinder (501) is in clearance fit with the inner wall of the cylindrical part; a circular shoulder (502) is provided at the end of the cylinder (501); the circular shoulder (502) can be inserted into the sand cleaning hole, and is in clearance fit with the inner wall of the sand cleaning hole; An O-ring rubber seal (8) is sleeved on the cylinder (501), and the O-ring rubber seal (8) is located in the groove formed between the circular shoulder (502) and the end of the cylindrical part; The bolt assembly includes a number of adjusting gaskets (2) located between the mounting plate (1) and the positioning sleeve (7) for adjusting the axial position of the positioning sleeve (7); The diameter of the second through hole (103) is 4 to 6 mm larger than the diameter of the second screw (10).

2. The adjustable sealing device for water test of the sand cleaning hole of the machine body according to claim 1, characterized in that: Chamfers are provided on the outer edges of the circular shoulder (502) and the end of the cylindrical part.

3. The adjustable sealing device for water test of the body cleaning hole according to claim 1, characterized in that: A first through hole (101) is provided in the middle of the mounting plate (1); there are two second through holes (103), which are respectively located on the left and right sides of the first through hole (101); the positioning sleeve (7) includes a flange fixedly connected to one side of the sleeve part, and a plurality of third through holes (701) are provided on the flange; the sleeve part is inserted into the first through hole (101), and the first screw (3) in the bolt assembly passes through the third through hole (701) and is screwed into the first threaded hole (102) preset on the mounting plate (1) to fixedly connect the positioning sleeve (7) and the mounting plate (1) together; A fourth through hole (702) is provided in the middle of the flange; the middle part of the adjusting shaft (5) passes through the fourth through hole (702), and an external thread is provided on the outside thereof; a shoulder nut (4) abutted against the outside of the flange is screwed on the external thread for threadedly connecting the middle part of the adjusting shaft (5) and the positioning sleeve (7).

4. The adjustable sealing device for water test of the sand cleaning hole of the machine body according to claim 1, characterized in that: A threaded hole (102) is provided in the middle of the positioning sleeve (7), and an external thread is provided in the middle of the adjusting shaft (5) for threadedly connecting the middle part of the adjusting shaft (5) and the positioning sleeve (7).

5. The adjustable sealing device for water test of the sand cleaning hole of the machine body according to claim 1, wherein: The diameter of the second through hole (103) is 5 mm larger than the diameter of the second screw (10).

6. The adjustable sealing device for water test of the body sand cleaning hole according to claim 1, characterized in that: A handle (6) is connected to the end of the adjusting shaft (5).

7. A method for using an adjustable sealing device for water testing of the sand cleaning holes of a body, characterized in that, Using an adjustable sealing device for water testing of the sand cleaning hole of the machine body according to any one of claims 1-6, the following steps are included: S1: Pre-assembly; Assemble the positioning sleeve (7), adjusting shaft (5), and O-ring rubber seal (8) together to form a plugging assembly, such that the O-ring rubber seal (8) is clamped in the groove; Then assemble the plugging assembly with the mounting plate (1) through the bolt assembly, such that a number of adjusting shims (2) are provided between the mounting plate (1) and the positioning sleeve (7); S2 Pre-installation; Install the mounting plate (1) on the machine body (11) through the second screw (10) passing through the second through-hole (103), but do not tighten the second screw (10); S3: Axial adjustment; After inserting the end of the plugging assembly with the O-ring rubber seal (8) into the sand cleaning hole, according to the position of the O-ring rubber seal (8), increase or decrease the number of adjusting shims (2) until the O-ring rubber seal (8) is located at the middle position of the hole wall of the sand cleaning hole, and then tighten the bolt assembly to fix the mounting plate (1) and the plugging assembly; S4: Radial adjustment; Utilize the gap between the second through-hole (103) and the second screw (10) to move the mounting plate (1), and the mounting plate (1) drives the position adjustment of the O-ring rubber seal (8) until the O-ring rubber seal (8) is concentric with the sand cleaning hole, and then tighten the second screw (10) to fix the mounting plate (1) on the machine body (11); S5: Extrude the O-ring rubber seal (8); Rotate the adjusting shaft (5), through the threaded connection between the middle part of the adjusting shaft (5) and the positioning sleeve (7), drive the adjusting shaft (5) to retract, forcing the groove to narrow and extrude the O-ring rubber seal (8), and the O-ring rubber seal (8) expands radially under extrusion to seal the sand cleaning hole.

8. The usage method of an adjustable sealing device for water testing of the sand cleaning hole of the machine body according to claim 7, characterized in that: The threaded connection between the middle part of the adjusting shaft (5) and the positioning sleeve (7) is achieved by abutting against the shoulder nut (4); The middle part of the adjusting shaft (5) is provided with external threads and penetrates through the fourth through-hole (702) preset in the middle of the positioning sleeve (7), and the shoulder nut (4) is screwed onto the external threads of the middle part of the adjusting shaft (5); When increasing or decreasing the adjusting shims (2) in step S3, first loosen the shoulder nut (4) and do not install the bolt assembly; There is no axial constraint between the adjusting shaft (5) and the positioning sleeve (7); The operator first initially positions the adjusting shaft (5) such that the O-ring rubber seal (8) is located at the middle position of the hole wall of the sand cleaning hole, then pushes the positioning sleeve (7) forward until the end of the cylindrical portion abuts against the O-ring rubber seal (8). At this time, according to the gap between the positioning sleeve (7) and the mounting plate (1), select the number of adjusting shims (2), and then install the positioning sleeve (7) and the mounting plate (1) together through the bolt assembly. Finally, tighten the shoulder nut (4) to initially fix the adjusting shaft (5); In step S5, the operator controls the adjusting shaft (5) with one hand and controls the shoulder nut (4) with a wrench with the other hand, and rotates one of the adjusting shaft (5) and the shoulder nut (4) to drive the adjusting shaft (5) to retract.

Images