Length and depth adjustable inner hole local coating device

Abstract

The invention discloses a local inner hole coating device with the adjustable length and depth. The local inner hole coating device comprises a medicine fixing support, a medicine fixing clamp arranged on the medicine fixing support and two sets of coating liquid positioning assemblies which are inserted into the two ends of an inner hole of a to-be-coated grain and are of the same structure. The coating liquid positioning assembly comprises a sealing block, an annular air bag, a mark positioning rod and a liquid injection pipe; a to-be-coated grain is clamped and positioned through the medicine fixing clamp, the two sets of coating liquid positioning assemblies are inserted into inner holes in the two ends of the to-be-coated grain respectively, the insertion depth of the two sets of coating liquid positioning assemblies is controlled through length scales on the marking positioning rod, and the to-be-coated grain can be coated by inflating the annular air bag. And the two sets of coating liquid positioning assemblies are axially positioned in an inner hole of the grain to be coated, and coating liquid is injected between the two sets of coating liquid positioning assemblies through the liquid injection pipe. The local coating device for the inner hole can achieve the full coating effect in target areas with different depths and lengths of the inner hole of the grain.

Description

TECHNICAL FIELD

[0001] The application relates to a length and depth adjustable inner hole partial coating device, and belongs to the technical field of propellant inner hole coating. BACKGROUND

[0002] In the trial production process of solid propellant charges, the application of inner hole partial coating technology of specific length and depth is often involved. The current inner hole coating technology mainly uses a brush to dip coating solution and then apply it to the target area, and then place it in a specific temperature environment for drying. The existing technology has the following problems:

[0003] 1. The whole coating process is manually operated, the amount of coating solution and the thickness of coating are related to the operation habits of personnel, the coating quality is difficult to control, and batch production is impossible;

[0004] 2. The precision of the coating tool is poor, the edge area is easy to leave white or overflow, and the positioning accuracy is poor;

[0005] 3. The target coating area needs to be manually accessible, and cannot be used for large length-diameter ratio propellant columns with small inner hole diameter and large coating depth;

[0006] 4. The coating process easily contaminates the non-target area, the cleaning is difficult, and the production efficiency is low. SUMMARY

[0007] The purpose of the application is to solve the problems of traditional inner hole coating technology, such as the inability to flexibly adjust the coating length, the uneven coating edge, the inaccurate positioning, and the inability to realize self-cleaning, and to provide a length and depth adjustable inner hole partial coating tool and a use method which have the above functions.

[0008] The purpose of the application can be achieved by the following technical solutions:

[0009] The length and depth adjustable inner hole partial coating device comprises a propellant support, a propellant clamp arranged on the propellant support, and two groups of structure identical coating liquid positioning assemblies inserted into the inner holes of the propellant columns to be coated.

[0010] The coating liquid positioning assembly comprises a sealing block, an annular air bag, a marking positioning rod and a liquid injection pipe.

[0011] The sealing block is a cylindrical structure with a diameter smaller than the diameter of the inner hole of the propellant column to be coated, an annular positioning groove is formed in the sidewall of the upper end of the sealing block, and an axial through liquid injection hole is formed in the middle of the sealing block.

[0012] The annular positioning groove of the sealing block is sleeved with an annular air bag, the lower end of the sealing block is fixed with the marker positioning rod, the side wall of the marker positioning rod is marked with a length scale from the upper edge of the annular positioning groove of the sealing block, and the lower end of the liquid injection hole of the sealing block is connected with the liquid injection pipe.

[0013] The to-be-coated propellant column is clamped and positioned by the propellant clamping fixture, two groups of coating liquid positioning assemblies are respectively inserted into the inner holes at the two ends of the to-be-coated propellant column, the insertion depth of the two groups of coating liquid positioning assemblies is controlled by the length scale on the marker positioning rod, the two groups of coating liquid positioning assemblies are axially positioned in the inner hole of the to-be-coated propellant column by inflating the annular air bag, and coating liquid is injected between the two groups of coating liquid positioning assemblies through the liquid injection pipe.

[0014] Working process

[0015] The to-be-coated propellant column is clamped and positioned by the propellant clamping fixture, two groups of coating liquid positioning assemblies are respectively inserted into the inner holes at the two ends of the to-be-coated propellant column; the insertion depth of the two groups of coating liquid positioning assemblies is controlled by the length scale on the marker positioning rod; the two groups of coating liquid positioning assemblies are axially positioned in the inner hole of the to-be-coated propellant column by inflating the annular air bag; coating liquid is injected between the two groups of coating liquid positioning assemblies from the liquid injection pipe at the lower end, and after the coating liquid overflows outward from the liquid injection pipe at the upper end, the injection of the coating liquid is stopped, and the excess coating liquid is discharged outward from the liquid injection pipe at the lower end; after the coating liquid solidifies, the annular air bag is deflated, and the two groups of coating liquid positioning assemblies are removed.

[0016] Beneficial effects

[0017] The inner hole local coating device can achieve full coating effect of target areas at different depths and lengths in the inner hole of the propellant column, avoids white edges or overflow, improves coating precision, reduces uncertainty of manual operation, improves coating production efficiency and product stability, and avoids pollution of non-target areas caused by material leakage when coating liquid is injected into the coating chamber through the conduit, thereby reducing cleaning intensity. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a structural schematic view of the inner hole local coating device;

[0019] In the figure, 1 is a propellant support, 2 is a propellant clamping fixture, 3 is a sealing block, 4 is an annular air bag, 5 is a marker positioning rod, 6 is a to-be-coated propellant column, and 7 is a liquid injection pipe. DETAILED DESCRIPTION

[0020] The content of the present application will be further described below in combination with the drawings and examples.

[0021] Examples

[0022] As Figure 1As shown, the present invention provides a length and depth adjustable internal hole partial coating device, including a drug-fixing support 1, a drug-fixing clamp 2 disposed on the drug-fixing support 1, and two sets of coating liquid positioning components with the same structure inserted into both ends of the internal hole of the drug column 6 to be coated.

[0023] The coating fluid positioning assembly includes a sealing block 3, an annular airbag 4, a marking positioning rod 5, and an injection tube 7;

[0024] The sealing block 3 is a cylindrical structure with a diameter smaller than the inner diameter of the drug column 6 to be coated. The upper side wall of the sealing block 3 has an annular positioning groove, and the middle part of the sealing block 3 has an axially penetrating injection hole.

[0025] An annular airbag 4 is fitted inside the annular positioning groove of the sealing block 3. The lower end of the sealing block 3 is fixed with the marking positioning rod 5. The side wall of the marking positioning rod 5 is engraved with the length scale from the upper edge of the annular positioning groove of the sealing block 3. The lower end of the injection hole of the sealing block 3 is connected to the injection tube 7.

[0026] The drug column 6 to be coated is clamped and positioned by the drug-fixing clamp 2. Two sets of coating liquid positioning components are respectively inserted into the inner holes at both ends of the drug column 6 to be coated. The insertion depth of the two sets of coating liquid positioning components is controlled by the length scale on the marking positioning rod 5. By inflating the annular airbag 4, the two sets of coating liquid positioning components are axially positioned in the inner hole of the drug column 6 to be coated. The coating liquid is injected between the two sets of coating liquid positioning components through the injection tube 7.

[0027] Work process

[0028] The drug column 6 to be coated is clamped and positioned by the drug-fixing clamp 2, and two sets of coating liquid positioning components are respectively inserted into the inner holes at both ends of the drug column 6 to be coated; the insertion depth of the two sets of coating liquid positioning components is controlled by the length scale on the marking positioning rod 5; by inflating the annular airbag 4, the two sets of coating liquid positioning components are axially positioned in the inner hole of the drug column 6 to be coated; the coating liquid is injected from the lower injection tube 7 into the space between the two sets of coating liquid positioning components until the coating liquid overflows from the upper injection tube 7, then the injection is stopped and the excess coating liquid is discharged from the lower injection tube 7; after the coating liquid solidifies, the annular airbag 4 is deflated and the two sets of coating liquid positioning components are removed.

Claims

1. A device for partially covering an inner hole with adjustable length and depth, characterized in that, The product includes a drug-fixing support, a drug-fixing clamp mounted on the drug-fixing support, and two sets of identical coating liquid positioning components inserted into both ends of the inner hole of the drug column to be coated. The coating fluid positioning assembly includes a sealing block, an annular airbag, a marking positioning rod, and an injection tube; The sealing block is a cylindrical structure with a diameter smaller than the inner diameter of the drug column to be coated. The upper side wall of the sealing block has an annular positioning groove, and the middle of the sealing block has an axially penetrating injection hole. An annular airbag is fitted inside the annular positioning groove of the sealing block. The marking positioning rod is fixed to the lower end of the sealing block. The side wall of the marking positioning rod is engraved with a length scale from the upper edge of the annular positioning groove of the sealing block. The lower end of the liquid injection hole of the sealing block is connected to the liquid injection tube. The drug column to be coated is clamped and positioned by the drug-fixing clamp. Two sets of coating liquid positioning components are respectively inserted into the inner holes at both ends of the drug column to be coated. The insertion depth of the two sets of coating liquid positioning components is controlled by the length scale on the marking positioning rod. By inflating the annular airbag, the two sets of coating liquid positioning components are axially positioned in the inner hole of the drug column to be coated. Coating liquid is injected between the two sets of coating liquid positioning components through the injection tube.

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