A bore coating apparatus

Abstract

The application relates to an inner hole coating device which comprises a base, a fixing device, a liquid injection device, a vacuum pumping device, a mold rod, a first plug rod and a second plug rod, the diameter of the mold rod is smaller than that of the inner hole of a workpiece, the mold rod passes through the inner hole, one end of the mold rod is fixed with a first sealing ball, the spherical surface of the first sealing ball abuts against the edge of one hole of the inner hole, the other end of the mold rod is sleeved with a second sealing ball along the length direction of the mold rod, the spherical surface of the second sealing ball abuts against the edge of the other hole of the inner hole, and the surfaces of the mold rod, the first sealing ball and the second sealing ball are all covered with a polytetrafluoroethylene coating; the second sealing ball is provided with a liquid inlet hole and a gas outlet hole which are communicated with the inner hole. The mold rod and the sealing balls at the two ends are used to form an annular cavity in the inner hole, then vacuum pumping is used to make the cavity have negative pressure, the polytetrafluoroethylene coating in the liquid injection device is sucked into and filled in the cavity, finally high-temperature solidification is used to form a polytetrafluoroethylene coating with uniform thickness at the inner hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of polytetrafluoroethylene coating equipment, in particular to an inner hole coating equipment. BACKGROUND

[0002] Polytetrafluoroethylene, also known as Teflon, is commonly referred to as "non-stick coating" or "easy-to-clean material"; it is a kind of artificial synthetic polymer material which uses fluorine to replace all hydrogen atoms in polyethylene. This material has the characteristics of acid and alkali resistance, resistance to various organic solvents, and is almost insoluble in all solvents. At the same time, polytetrafluoroethylene has the characteristics of high temperature resistance.

[0003] The processing of polytetrafluoroethylene coating mainly uses a spray gun to spray polytetrafluoroethylene coating on the surface of the workpiece, and then performs high-temperature curing to form a polytetrafluoroethylene coating. However, for an inner hole with a relatively long length and a relatively small diameter, due to size limitations, the spray rod of the spray gun is difficult to extend into the deep part of the inner hole, thereby making it difficult to spray the inner surface of the inner hole, and there is a certain limitation. SUMMARY

[0004] In order to realize the coating processing of the inner hole of the workpiece, the present application provides an inner hole coating equipment.

[0005] The inner hole coating equipment provided by the present application adopts the following technical scheme:

[0006] An inner hole coating equipment, comprising a base, a fixing device, a liquid injection device, a vacuum pumping device, a mold rod, a first stopper rod and a second stopper rod, the fixing device is located on the base, the fixing device is used for fixing the workpiece, the diameter of the mold rod is smaller than the inner hole of the workpiece, the mold rod passes through the inner hole, one end of the mold rod is fixed with a first sealing ball, the spherical surface of the first sealing ball abuts against the edge of one hole of the inner hole, the other end of the mold rod is sleeved with a second sealing ball along the length direction of the mold rod, the spherical surface of the second sealing ball abuts against the edge of the other hole of the inner hole, and the surfaces of the mold rod, the first sealing ball and the second sealing ball are covered with polytetrafluoroethylene coating; the second sealing ball is provided with a liquid inlet hole and an air outlet hole which are communicated with the inner hole, the vacuum pumping device is used for pumping the air in the inner hole through the air outlet hole, and the liquid injection device is used for injecting polytetrafluoroethylene into the inner hole in a negative pressure state; the surfaces of the first stopper rod and the second stopper rod are covered with polytetrafluoroethylene coating, the first stopper rod is used for being inserted into the liquid inlet hole, and the second stopper rod is used for being inserted into the air outlet hole.

[0007] By adopting the above technical scheme, during processing, the first sealing ball and the second sealing ball are respectively sealed and abutted against the edges of the two holes of the inner hole to fix the mold rod at the axis of the inner hole, so as to form an annular cavity in the inner hole, and the spherical surface abutting cooperation can ensure the coaxiality between the mold rod and the inner hole, so as to ensure that the thicknesses of the parts in each length direction of the annular cavity are as equal as possible.

[0008] Then, the vacuum device is used in cooperation with the air outlet hole to extract the air in the inner hole, so that the cavity is under negative pressure. After the air extraction is completed, the liquid injection device is started, and the polytetrafluoroethylene coating in the liquid injection device is then sucked into the cavity through the liquid inlet hole. Then, the first plug rod and the second plug rod are respectively inserted to squeeze the residual coating in the liquid inlet hole and the air outlet hole into the cavity, so as to ensure the fullness of the coating in the cavity and to reduce the outflow of the coating from the air outlet hole or the liquid inlet hole.

[0009] Finally, the workpiece, the mold rod, the first sealing ball, the second sealing ball, the first plug rod and the second plug rod are subjected to high-temperature curing together, so as to form a polytetrafluoroethylene coating with uniform thickness at the cavity.

[0010] After the curing is completed, since the surfaces of the mold rod, the first sealing ball, the second sealing ball, the first plug rod and the second plug rod are all coated with polytetrafluoroethylene, the high-temperature polytetrafluoroethylene coating remains unchanged due to its high-temperature resistance and irreversible melting property. Then, the mold rod, the first sealing ball, the second sealing ball, the first plug rod and the second plug rod are sequentially removed from the workpiece. Then, the non-stick property of the polytetrafluoroethylene coating can also ensure that the polytetrafluoroethylene coating on the inner hole will not be torn or damaged after the mold rod is removed, thereby ensuring the structural integrity of the inner hole coating.

[0011] When the vacuum device extracts the air in the inner hole to make the cavity under negative pressure, the pressure outside the workpiece is relatively large, and the force of the external pressure will be applied to the first sealing ball and the second sealing ball to force the first sealing ball and the second sealing ball to abut more tightly at the edge of the inner hole, so as to further improve the sealing performance and facilitate subsequent liquid injection.

[0012] Optionally, the cross-sectional areas of the liquid inlet hole and the air outlet hole gradually increase in the direction away from the inner hole. The surface of the mold rod is provided with a V-shaped first transition groove and a V-shaped second transition groove. The first transition groove is in communication with the inner hole and the liquid inlet hole, and the second transition groove is in communication with the inner hole and the air outlet hole.

[0013] By adopting the above technical solution, the connection diameters of the liquid inlet hole or the air outlet hole and the cavity are increased by setting the transition grooves, so as to facilitate the injection of the coating and to improve the uniformity of the coating filled in the cavity.

[0014] Secondly, by setting the shapes of the liquid inlet hole and the air outlet hole, the insertion completeness of the first plug rod and the second plug rod is improved, so as to as far as possible to completely remove the residual coating in the liquid inlet hole and the air outlet hole. In addition, the easy-to-separate property of the first plug rod and the second plug rod is improved, so as to facilitate the plug rod removal operation after the coating is cured.

[0015] Optionally, one end of the die rod is threadedly connected with a threaded sleeve, and an abutting cylinder is fixed on the threaded sleeve, the abutting cylinder is coaxially arranged with the die rod, the surfaces of the threaded sleeve and the abutting cylinder are covered with a polytetrafluoroethylene coating, and the end of the abutting cylinder is used for abutting against the part of the spherical surface of the second blocking ball which is away from the inner hole.

[0016] By adopting the above technical scheme, the threaded sleeve is screwed to drive the abutting cylinder to extrude the second blocking ball, and the second blocking ball slides along the length direction of the die rod to abut against the edge of the aperture of the inner hole, thereby improving the abutting stability of the first blocking ball and the second blocking ball to reduce the occurrence of the leakage of the coating in the cavity.

[0017] Optionally, the fixing device further comprises two fixing blocks, the fixing blocks are fixed with insertion blocks, and the outer surface of the abutting cylinder is provided with insertion holes for the insertion blocks to be inserted along the radial direction of the die rod, and when the insertion blocks are inserted into the insertion holes, the two fixing blocks abut against the ends of the first plug rod and the second plug rod, respectively.

[0018] By adopting the above technical scheme, the possibility of the separation of the first plug rod and the second plug rod can be reduced to reduce the situation that the plug rod is pressed out due to the too large pressure of the coating in the cavity.

[0019] Optionally, the fixing device comprises a rotating disc, a positioning plate, and a guide disc with a notch, the guide disc is installed on the base, and the rotating disc is used for being installed on the lower surface of the annular workpiece; the rotating disc is rotationally connected with the guide disc; the positioning plate is installed on the upper surface of the annular workpiece; a plurality of positioning threaded holes which are uniformly arranged in the circumferences are formed in the guide disc; and the rotating disc and the positioning plate are simultaneously vertically penetrated by bolts which are matched with the positioning threaded holes.

[0020] By adopting the above technical scheme, when the workpiece is an annular cavity and the inner hole is located at the upper aperture of the cavity workpiece, the fixing device can be clamped according to the situation, that is, the workpiece is fixed by the cooperation of the positioning plate and the rotating disc, and then the workpiece is fixed on the guide disc by the cooperation of the bolts and the positioning threaded holes, so as to facilitate the coating processing of the inner hole.

[0021] When another inner hole of the workpiece needs to be coated, the locking of the bolts can be released, the rotating disc and the workpiece are rotated, so that the other inner hole of the workpiece is located at the working position (the notch of the guide disc) to be processed, and then the bolts are tightened to cooperate with new positioning threaded holes to complete the positioning and fixing of the workpiece, so that the coating processing of the inner holes at different positions of the annular workpiece is realized.

[0022] Optionally, the fixing device further comprises a position adjusting mechanism which is used for adjusting the horizontal and height positions of the liquid injection device.

[0023] By adopting the technical scheme, the liquid inlet hose of the liquid injection device is short, so that the liquid injection and the paint blockage can be timely and the residual paint can be conveniently cleaned up.

[0024] Optionally, the rotating centering device further comprises a rotation-preventing mechanism, a first rotating wheel arranged on the fixing device, a guide block, and a first motor for driving the first rotating wheel to rotate, wherein the rotation-preventing mechanism is arranged to prevent the first blocking ball from rotating; a friction surface is arranged on the outer periphery of the first rotating wheel, the friction surface of the first rotating wheel is tangentially arranged on the outer periphery of the threaded sleeve, the guide block is arranged directly below the threaded sleeve, the guide block is provided with a guide inclined surface, the guide inclined surface is tangentially arranged on the outer periphery of the threaded sleeve, and the included angle between the two tangent points of the outer periphery of the threaded sleeve and the two lines connecting the center of the threaded sleeve is greater than 90°.

[0025] By adopting the technical scheme, the rotation-preventing mechanism prevents the first blocking ball from rotating, when the first rotating wheel rotates, the threaded sleeve is driven to rotate relative to the mold rod by the friction force, so that the threaded sleeve is driven to move to abut against the second blocking ball, thereby completing the abutting sealing of the two orifices of the inner hole without manual operation, saving time and effort.

[0026] Secondly, by arranging the two tangent points of the threaded sleeve, the position of the threaded sleeve is limited, so that the rotation center of the threaded sleeve is coaxial with the inner hole as much as possible, thereby ensuring that the force applied by the threaded sleeve to the second blocking ball is coaxial with the inner hole, i.e., the force applied by the second blocking ball to the orifice of the inner hole is coaxial with the inner hole, so that the force at the edge of the orifice of the inner hole is equal everywhere, thereby greatly improving the abutting sealing effect.

[0027] Meanwhile, the first rotating wheel and the guide block cooperate to continuously correct the coaxiality of the threaded sleeve and the inner hole during the rotation of the threaded sleeve, thereby indirectly improving the coaxiality of the mold rod and the inner hole, so that the size of the annular cavity is as equal as possible, thereby improving the thickness uniformity of the coating of the inner hole.

[0028] Optionally, the rotating centering device further comprises a second rotating wheel arranged on the fixing device and a second motor for driving the second rotating wheel to rotate, wherein a smooth surface is arranged on the outer periphery of the second rotating wheel, the friction surface of the second rotating wheel is tangentially arranged on the outer periphery of the threaded sleeve, the two tangent points of the threaded sleeve and the first rotating wheel and the second rotating wheel are symmetrically arranged with respect to the axis of the threaded sleeve, and the rotating direction of the second rotating wheel is opposite to that of the first rotating wheel.

[0029] By adopting the technical scheme, the tangency of the second rotating wheel can further limit the position of the threaded sleeve, and the interference correction force of the second rotating wheel in the rotating state on the threaded sleeve can correct the eccentric rotation of the threaded sleeve, thereby improving the rotating coaxiality of the threaded sleeve.

[0030] Optionally, the anti-rotation mechanism comprises a bracket, a spring and a block, the bracket is installed on the fixing device, the bracket is located on the side of the first blocking ball away from the inner hole, the spring is arranged along the axial direction of the mold rod, one end of the spring is fixedly connected with the bracket, and the other end of the spring is fixedly connected with the block, a square hole is formed in the first blocking ball, and the block is inserted into the square hole, and the elastic force of the spring is applied to the first blocking ball through the block.

[0031] By adopting the technical scheme, firstly, the spring is arranged, and the elastic force of the spring forces the first blocking ball to abut against the orifice of the inner hole, so as to resist the axial force generated by the rotation of the threaded sleeve, thereby ensuring the sealing abutment effect of the first blocking ball, and the abutment of the first blocking ball is used as a fulcrum for adjusting the axial center of the mold rod, thereby improving the axial centering effect of the mold rod.

[0032] Secondly, when the threaded sleeve is rotated by the rotating axial centering device, initially, the threaded connection friction of the threaded sleeve is large, the threaded sleeve drives the mold rod to move synchronously, the torque of the mold rod is transmitted to the spring through the fixed connection between the first blocking ball and the mold rod and the connection between the first blocking ball and the block, the spring accumulates elastic force, and when the elastic force of the spring is greater than the threaded connection friction of the threaded sleeve, the elastic force of the spring prevents the mold rod from rotating, so that the threaded sleeve rotates relative to the mold rod, thereby realizing the tightening of the threaded sleeve.

[0033] Optionally, the tightening direction of the threaded sleeve is the same as the tightening direction of the spring.

[0034] By adopting the technical scheme, when the threaded sleeve is rotated by the rotating axial centering device, initially, the threaded connection friction of the threaded sleeve is large, the threaded sleeve drives the mold rod to move synchronously, the torque of the mold rod is transmitted to the spring, the spring is deformed in a tightening manner due to the torque, that is, the diameter of the spring becomes smaller, the axial length of the spring increases, the accumulated elastic force of the spring increases, and the rigidity of the spring increases, and the changes of the above characteristics can greatly improve the sealing abutment force of the first blocking, that is, the sealing effect is improved.

[0035] In summary, the present application has at least one of the following beneficial technical effects:

[0036] 1. The mold rod and the blocking balls at both ends are used to form an annular cavity in the inner hole, then vacuum is drawn to make the cavity negative pressure, and then the polytetrafluoroethylene coating in the liquid injection device is sucked into and filled in the cavity, and finally high-temperature curing is performed, so as to form a polytetrafluoroethylene coating with uniform thickness at the inner hole;

[0037] 2. By setting the rotating centering device, the first rotating wheel, the second rotating wheel and the guide block cooperate, the coaxiality of the thread sleeve and the inner hole is constantly corrected during the rotation of the thread sleeve, thereby indirectly improving the coaxiality of the die rod and the inner hole, so that the size of the annular cavity is as equal as possible, thereby improving the thickness uniformity of the coating of the inner hole. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a sectional view of the overall structure of Example 1.

[0039] Figure 2 is a partial enlarged view of A in Figure 1

[0040] Figure 3 is a partial schematic view of Example 1 for showing that the first plug rod and the second plug rod are in the inserted state.

[0041] Figure 4 is a schematic view of the workpiece of Example 2.

[0042] Figure 5 is a top view of the fixing device of Example 2.

[0043] Figure 6 is a sectional view of the overall structure of Example 2.

[0044] Figure 7 is a partial enlarged view of B in Figure 6

[0045] Figure 8 is a sectional view of the overall structure of Example 3.

[0046] Figure 9 is a side view of Example 3 for showing the cooperation relationship of the first rotating wheel, the second rotating wheel and the thread sleeve respectively.

[0047] Figure 10 is a schematic view of the shape change of the spring of Example 3.

[0048] ​​Explanation of reference signs: 1, base; 2, fixing device; 3, liquid injection device; 4, die rod; 5, threaded sleeve; 10, workpiece; 11, stand; 20, inner hole; 21, guide disc; 211, extension arm; 212, steel column; 213, rotating disc; 214, positioning plate; 215, bolt; 216, positioning threaded hole; 221, horizontal slide rail; 222, horizontal screw; 223, sliding block; 231, vertical rod; 232, vertical screw; 233, bearing seat; 234, connecting arm; 30, cavity; 31, storage tank; 32, liquid inlet hose; 321, first on-off valve; 40, flange; 401, first transition groove; 402, second transition groove; 41, first plugging ball; 411, square hole; 42, second plugging ball; 420, perforation; 421, liquid inlet hole; 422, air outlet hole; 43, first stopper; 44, second stopper; 441, fixed block; 442, insertion block; 51, abutting cylinder; 511, insertion hole; 61, air extraction pipe; 611, second on-off valve; 71, bracket; 72, spring; 73, sleeve; 74, square block; 81, first rotating wheel; 82, second rotating wheel; 83, guide block; 831, guide inclined surface; 841, supporting rod; 842, first motor; 843, second motor. DETAILED DESCRIPTION

[0049] The following will be described in detail in combination with the accompanying drawings. Figures 1-10 The present application is further described in detail.

[0050] Embodiment 1 of the present application discloses an inner hole 20 coating device for coating polytetrafluoroethylene coating on the inner hole 20 of a workpiece 10, which can be in block or plate shape.

[0051] Referring to Figure 1 , the inner hole 20 coating device comprises a base 1, a fixing device 2, a liquid injection device 3, a vacuum extraction device, a die rod 4, a first stopper 43 and a second stopper 44, wherein the fixing device 2 is used for fixing the workpiece 10, and the fixing device 2 in the embodiment is two clamping blocks which clamp and position the workpiece 10.

[0052] As Figure 1 , Figure 2As shown, the diameter of the die rod 4 is smaller than the inner diameter of the inner hole 20 of the workpiece 10, the die rod 4 is coaxially arranged with the inner hole 20, so that an annular cavity 30 is formed between the outer surface of the die rod 4 and the inner wall of the inner hole 20; one end of the die rod 4 is fixed with a first sealing ball 41, the spherical surface of the first sealing ball 41 abuts against the edge of one aperture of the inner hole 20 to achieve sealing abutment, the other end of the die rod 4 is provided with a second sealing ball 42, specifically, the second sealing ball 42 penetrates the through hole 420, the die rod 4 penetrates the through hole 420, so that the second sealing ball 42 can slide axially along the die rod 4, and the die rod 4 is also provided with a pressing structure, the pressing structure is used to force the second sealing ball 42 to slide towards the inner hole 20, so that the spherical surface of the second sealing ball 42 abuts against the edge of the aperture of the inner hole 20 away from the first sealing ball 41, in this way, the sealing abutment of the first sealing ball 41 and the second sealing ball 42 forms a closed space for the cavity 30.

[0053] The pressing structure includes a threaded sleeve 5 and an abutting cylinder 51, the threaded sleeve 5 is threadedly connected to one end of the die rod 4, the abutting cylinder 51 is coaxially arranged with the die rod 4, one end of the abutting cylinder 51 is integrally connected with the threaded sleeve 5, by rotating the threaded sleeve 5, the abutting cylinder 51 is driven to move axially, so that the end of the abutting cylinder 51 abuts against the part of the spherical surface of the second sealing ball 42 away from the inner hole 20, so that the first sealing ball 41 and the second sealing ball 42 simultaneously clamp the two ends of the inner hole 20 to achieve sealing abutment.

[0054] As shown in Figure 2 , Figure 3 , the second sealing ball 42 is obliquely provided with a liquid inlet hole 421 and a gas extraction hole 422 communicating with the inner hole 20, the cross-sectional areas of the liquid inlet hole 421 and the gas extraction hole 422 gradually increase away from the inner hole 20, the surface of the die rod 4 is provided with a V-shaped first transition groove 401 and a V-shaped second transition groove 402, the first transition groove 401 respectively communicates with the aperture of the cavity 30 and the liquid inlet hole 421, and the second transition groove 402 respectively communicates with the aperture of the cavity 30 and the gas extraction hole 422; the first plug rod 43 is matched with the shape of the liquid inlet hole 421 and the shape of the first transition groove 401, and the second plug rod 44 is matched with the shape of the gas extraction hole 422 and the shape of the second transition groove 402.

[0055] As shown in Figure 1 , Figure 2 , the liquid injection device 3 includes a storage tank 31 and a liquid inlet hose 32, the storage tank 31 stores polytetrafluoroethylene paint, the storage tank 31 is installed on the base 1, the storage tank 31 is located on one side of the workpiece 10 to be machined, one end of the liquid inlet hose 32 extends into the storage tank 31, the other end of the liquid inlet hose 32 can be inserted into the liquid inlet hole 421 with interference, and the liquid inlet hose 32 is provided with a first switch valve 321.

[0056] The vacuumizing device comprises a vacuumizing pipe 61 and a vacuumizing mechanism (not shown in the figure), the vacuumizing mechanism can be placed away from one side of the workpiece 10, one end of the vacuumizing pipe 61 is connected with the air suction end of the vacuumizing mechanism, the other end of the vacuumizing pipe 61 can be inserted into the air suction hole 422 in an interference fit, and the second switch valve 611 is arranged on the vacuumizing pipe 61.

[0057] The surface of the die rod 4, the first plug rod 43, the second plug rod 44, the first blocking ball 41, the second blocking ball 42, the threaded sleeve 5 and the abutting cylinder 51 is sprayed with a polytetrafluoroethylene coating.

[0058] The specific processing steps are as follows: the die rod 4 is inserted into the inner hole 20 of the workpiece 10, then the threaded sleeve 5 is rotated to drive the abutting cylinder 51 to move axially, so that the end of the abutting cylinder 51 abuts against the part of the spherical surface of the second blocking ball 42 away from the inner hole 20, so that the first blocking ball 41 and the second blocking ball 42 clamp the two ends of the inner hole 20 at the same time, to realize the sealing abutment of the cavity 30, at this time, through the spherical surface abutment cooperation, the coaxiality between the die rod 4 and the inner hole 20 can be ensured, so as to ensure that the thickness of each length direction part of the annular cavity 30 is as equal as possible.

[0059] Then, the air suction pipe 61 is inserted into the air suction hole 422, the second switch valve 611 is opened, the liquid inlet hose 32 is inserted into the liquid inlet hole 421, and the first switch valve 321 is closed, at this time, the cavity 30 has only one inlet (air suction hole 422), then the vacuumizing mechanism is started to suck the air in the cavity 30 away through the air suction hole 422, so that the cavity 30 is in a negative pressure state, then the second switch valve 611 is closed and the first switch valve 321 is opened, at this time, the cavity 30 is filled with polytetrafluoroethylene coating in the storage tank 31 through the liquid inlet hose 32, the liquid inlet hole 421, the first transition groove 401 under the action of the external atmospheric pressure, at the same time, the polytetrafluoroethylene coating also fills the liquid inlet hole 421 and the air suction hole 422.

[0060] First, the air suction pipe 61 is pulled out, then the second plug rod 44 is inserted into the air suction hole 422, and the polytetrafluoroethylene coating in the air suction hole 422 and the second transition groove 402 is extruded into the cavity 30 during the insertion of the second plug rod 44, then the liquid inlet hose 32 is pulled out, then the first plug rod 43 is inserted into the liquid inlet hole 421, and the polytetrafluoroethylene coating in the liquid inlet hole 421 and the first transition groove 401 is extruded into the cavity 30 during the insertion of the first plug rod 43, so as to improve the fullness of the coating in the cavity 30, and also to reduce the outflow of the coating from the air suction hole 422 or the liquid inlet hole 421.

[0061] Finally, the workpiece 10, the die rod 4, the first blocking ball 41, the second blocking ball 42, the first plug rod 43 and the second plug rod 44 are high-temperature cured together to form a coating with uniform thickness at the cavity 30.

[0062] After the curing is completed, since the surfaces of the mold rod 4, the first blocking ball 41, the second blocking ball 42, the first plug rod 43 and the second plug rod 44 are all coated with polytetrafluoroethylene, the polytetrafluoroethylene coating remains unchanged after high temperature due to the high temperature resistance and irreversible melting property, and then the mold rod 4, the first blocking ball 41, the second blocking ball 42, the first plug rod 43 and the second plug rod 44 are sequentially removed from the workpiece 10, and then the non-stick property of the polytetrafluoroethylene coating can also ensure that the coating on the inner hole 20 will not be torn or damaged after the mold rod 4 is removed, thereby ensuring the structural integrity of the coating on the inner hole 20.

[0063] In order to reduce the possibility of the first plug rod 43 and the second plug rod 44 being separated from the liquid inlet hole 421 and the gas extraction hole 422 respectively, the following structure can also be added, the abutting cylinder 51 is provided with a fixed block 441 and an insertion block 442, the insertion block 442 is fixed to one end of the fixed block 441, and the outer surface of the abutting cylinder 51 is provided with an insertion hole 511 along the radial direction of the abutting cylinder 51.

[0064] When the first plug rod 43 or the second plug rod 44 is inserted, the insertion block 442 is inserted into the insertion hole 511, at this time, the fixed block 441 abuts against the exposed end of the first plug rod 43 or the second plug rod 44, so as to prevent the first plug rod 43 or the second plug rod 44 from being separated.

[0065] Example 2

[0066] The difference between Example 2 and Example 1 is that the inner hole 20 coating device of Example 2 is suitable for annular workpieces 10 (see Figure 4 ), such as the coating processing of the inner hole 20 of a cavity, the inner hole 20 on the workpiece 10 has multiple

[0067] As shown in Figure 5 , Figure 6 In this embodiment, the fixing device 2 includes a rotating disc 213, a positioning plate 214, a guide disc 21 with a notch, and a position adjusting mechanism, the guide disc 21 is semi-annular and horizontally arranged, the guide disc 21 is fixedly connected with the base 1 through a plurality of vertical columns 11, the guide disc 21 is integrally formed with an extension arm 211 at both ends of the notch, a plurality of steel columns 212 are fixedly arranged on the upper surface of the guide disc 21, the steel columns 212 are uniformly arranged along the circumferential direction of the guide disc 21, a plurality of positioning screw holes 216 are arranged on the guide disc 21, and the positioning screw holes 216 are uniformly arranged along the circumference of the guide disc 21.

[0068] As shown in Figure 6 , Figure 7As shown, the rotating disc 213 is annular, the rotating disc 213 is sleeved on the cavity, the upper surface of the rotating disc 213 is attached to the lower surface of the flange 40 of the cavity, the outer edge of the rotating disc 213 abuts against the steel column 212, and the circumferentially-arranged steel columns 212 limit the rotating disc 213, so that the rotating disc 213 can rotate relative to the guide disc 21. The positioning plate 214 is annular, the positioning plate 214 is located on the upper surface of the flange 40 of the cavity, and the rotating disc 213 and the positioning plate 214 are both vertically penetrated by the bolt 215, so as to achieve the fixed connection between the rotating disc 213, the positioning plate 214 and the cavity.

[0069] The rotating disc 213 and the guide disc 21 are used to rotate together to drive the cavity to rotate until the to-be-processed inner hole 20 of the cavity moves to the machining position (the gap of the guide disc 21), and then the bolt 215 is tightened, and the bolt 215 is matched with the corresponding positioning threaded hole 216 to lock the cavity on the guide disc 21.

[0070] As shown in Figure 5 , Figure 6 , the position adjusting mechanism includes a horizontal adjusting structure and a height adjusting structure. The horizontal adjusting structure includes a horizontal sliding rail 221, a horizontal screw rod 222 and a sliding block 223. The horizontal sliding rail 221 is fixed to the base 1. The horizontal screw rod 222 is rotationally connected with the horizontal sliding rail 221. The sliding block 223 is slidingly matched with the horizontal sliding rail 221. The horizontal screw rod 222 is threadedly connected with the sliding block 223.

[0071] The height adjusting structure includes a vertical rod 231, a vertical screw rod 232 and a bearing seat 233. The lower end of the vertical rod 231 is fixed to the sliding block 223. The lower end of the vertical screw rod 232 is rotationally connected with the sliding block 223. The bearing seat 233 is located directly above the sliding block 223. The vertical rod 231 slidingly penetrates through the bearing seat 233. The vertical screw rod 232 is threadedly connected with the bearing seat 233. The storage tank 31 is located on the bearing seat 233.

[0072] The horizontal screw rod 222 and the vertical screw rod 232 are rotated to respectively adjust the horizontal position and the height position of the bearing seat 233, so as to realize the approach or the departure of the storage tank 31 and the liquid inlet hose 32 to the inner hole 20 of the workpiece 10.

[0073] The implementation principle of the inner hole 20 coating device in the embodiment is that the position adjusting mechanism is used to adjust the position of the storage tank 31 to adapt to the coating filling of the inner holes 20 at different positions. In addition, the guide disc 21 is used to rotate and position the annular workpiece 10, so as to sequentially machine the plurality of inner holes 20 and improve the machining efficiency.

[0074] Embodiment 3

[0075] The difference between embodiment 3 and embodiment 2 is that, as shown in Figure 8 ,Figure 9 As shown, the inner hole 20 coating device further comprises a rotation centering device, which comprises a rotation stopping mechanism, a first rotating wheel 81, a second rotating wheel 82 and a guide block 83.

[0076] The rotation stopping mechanism comprises a support 71, a spring 72 and a block 74. The support 71 is located at a side of the first blocking ball 41 away from the inner hole 20, and is fixedly connected with the bearing seat 233 through a connecting arm 234. The spring 72 is arranged along the axial direction of the die rod 4, and the screwing direction of the spring 72 is the same as that of the threaded sleeve 5. The support 71 is fixed with a sleeve 73. One end of the spring 72 is fixedly connected with the support 71 and the spring 72 is located in the sleeve 73. The other end of the spring 72 is fixedly connected with the block 74. The first blocking ball 41 is provided with a square hole 411, and the block 74 is inserted into the square hole 411. The elastic force of the spring 72 is applied to the first blocking ball 41 through the block 74, so as to force the first blocking ball 41 to abut and seal against an orifice of the inner hole 20.

[0077] The bearing seat 233 is fixedly provided with two vertical supporting rods 841. The first rotating wheel 81 and the second rotating wheel 82 are respectively rotatably connected with the upper ends of the two supporting rods 841. The two supporting rods 841 are respectively provided with a first motor 842 and a second motor 843. The first motor 842 is used to drive the first rotating wheel 81 to rotate, and the second motor 843 is used to drive the second rotating wheel 82 to rotate. The rotating direction of the second rotating wheel 82 is opposite to that of the first rotating wheel 81. The first rotating wheel 81 and the second rotating wheel 82 are respectively located at the horizontal two sides of the threaded sleeve 5, and the outer circumferential surfaces of the first rotating wheel 81 and the second rotating wheel 82 are tangent to the outer circumferential surface of the threaded sleeve 5.

[0078] The first rotating wheel 81 is a rubber wheel, and the outer circumferential surface of the first rotating wheel 81 is a friction surface. The second rotating wheel 82 is a steel wheel, and the outer circumferential surface of the second rotating wheel 82 is a smooth surface.

[0079] The guide block 83 is vertically fixed on the bearing seat 233. The upper end of the guide block 83 is provided with a guide inclined surface 831, which is tangent to the outer circumferential surface of the threaded sleeve 5. The tangent point between the guide inclined surface 831 and the outer circumferential surface of the threaded sleeve 5 and the tangent point between the first rotating wheel 81 and the outer circumferential surface of the threaded sleeve 5 are connected to form a line, and the included angle between the line and the tangent point between the first rotating wheel 81 and the outer circumferential surface of the threaded sleeve 5 is greater than 90°.

[0080] When the threaded sleeve 5 needs to be rotated to drive the second blocking ball 42 to abut against the orifice of the inner hole 20, the first rotating wheel 81 and the second rotating wheel 82 are simultaneously rotated, and the torque of the first rotating wheel 81 is transmitted to the threaded sleeve 5 through the cooperation of the friction surface and the threaded sleeve 5. At the beginning, the threaded connection friction force of the threaded sleeve 5 is large, the threaded sleeve 5 drives the die rod 4 to move synchronously, the torque of the die rod 4 is transmitted to the spring 72 through the fixed connection of the first blocking ball 41 and the die rod 4 and the connection of the first blocking ball 41 and the block 74, the spring 72 accumulates elastic force, and when the elastic force of the spring 72 is greater than the threaded connection friction force of the threaded sleeve 5, the elastic force of the spring 72 prevents the die rod 4 from rotating. At this time, the threaded sleeve 5 starts to rotate relative to the die rod 4 to realize the screwing-in of the threaded sleeve 5.

[0081] During the screwing-in of the threaded sleeve 5, since the first blocking ball 41 is always in the state of abutting against the orifice of the inner hole 20 under the elastic force of the spring 72, the abutment of the first blocking ball 41 can be used as the fulcrum for adjusting the axis of the die rod 4, that is, the angle between the axis of the die rod 4 and the axis of the inner hole 20 is adjustable. Then, by setting the three-phase contact point of the threaded sleeve 5, the coaxiality of the threaded sleeve 5 and the inner hole 20 is continuously corrected, thereby indirectly improving the coaxiality of the die rod 4 and the inner hole 20, and further making the sizes of the annular cavity 30 as equal as possible, thereby improving the thickness uniformity of the coating of the inner hole 20.

[0082] Moreover, since the tightening direction of the threaded sleeve 5 is the same as the tightening direction of the spring 72, at the initial stage of driving the threaded sleeve 5 to rotate, the spring 72 is deformed in the tightening state under the torque of the die rod 4, as shown in Figure 10 At this time, the diameter of the spring 72 is reduced, the axial length of the spring 72 is increased, the accumulated elastic force of the spring 72 is increased, and the rigidity is increased, so that the spring 72 in this state can greatly improve the sealing abutment force of the first blocking ball 41 to effectively resist the axial force generated by the rotation of the threaded sleeve 5, and also improve the sealing effect of the first blocking ball 41.

[0083] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, so that: any equivalent changes made on the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An inner hole coating device, characterized in that: The invention comprises a base (1), a fixing device (2), a liquid injection device (3), a vacuum device, a mold rod (4), a rotation centering device, a first stopper rod (43) and a second stopper rod (44), wherein the fixing device (2) is located on the base (1), the fixing device (2) is used to fix the workpiece (10), the diameter of the mold rod (4) is smaller than the inner hole (20) of the workpiece (10), the mold rod (4) passes through the inner hole (20), a first blocking ball (41) is fixed to one end of the mold rod (4), the spherical surface of the first blocking ball (41) abuts against an edge of an opening of the inner hole (20), the other end of the mold rod (4) is sleeved with a second blocking ball (42) along its own length direction, and the second blocking ball (42) is sleeved on the other end of the mold rod (4). The spherical surface of the second blocking ball (42) abuts against the edge of the other opening of the inner hole (20), and the surfaces of the mold rod (4), the first blocking ball (41) and the second blocking ball (42) are all covered with a polytetrafluoroethylene coating; the second blocking ball (42) is provided with a liquid inlet (421) and an air extraction hole (422) connected to the inner hole (20), the vacuum device extracts air from the inner hole (20) through the air extraction hole (422), and the liquid injection device (3) is used to inject polytetrafluoroethylene into the inner hole (20) in a negative pressure state; the surfaces of the first stopper rod (43) and the second stopper rod (44) are all covered with a polytetrafluoroethylene coating, and the first stopper rod (43) is used to be inserted into the inner hole (20). The second stopper rod (44) is inserted into the liquid inlet hole (421); one end of the mold rod (4) is threadedly connected to a threaded sleeve (5), and an abutting tube (51) is fixed on the threaded sleeve (5), and the abutting tube (51) is coaxially arranged with the mold rod (4). The surfaces of the threaded sleeve (5) and the abutting tube (51) are both covered with a polytetrafluoroethylene coating, and the end of the abutting tube (51) is used to abut against the portion of the spherical surface of the second sealing ball (42) that is away from the inner hole (20); the rotation centering device includes a rotation-stop mechanism, a first rotating wheel (81) provided on the fixing device (2), a guide block (83) and a drive mechanism. A first motor (842) drives the first rotating wheel (81) to rotate, and the anti-rotation mechanism is used to prevent the first blocking ball (41) from rotating; the outer peripheral surface of the first rotating wheel (81) is set as a friction surface, and the friction surface of the first rotating wheel (81) is tangent to the outer peripheral surface of the threaded sleeve (5); the guide block (83) is located directly below the threaded sleeve (5), and the guide block (83) is provided with a guide inclined surface (831), and the guide inclined surface (831) is tangent to the outer peripheral surface of the threaded sleeve (5), and the angle between the two tangent points of the outer peripheral surface of the threaded sleeve (5) and the two connecting lines of the center of the threaded sleeve (5) is greater than 90°;The anti-rotation mechanism comprises a bracket (71), a spring (72) and a block (74); the bracket (71) is mounted on the fixing device (2); the bracket (71) is located on a side of the first blocking ball (41) away from the inner hole (20); the spring (72) is arranged axially along the mold rod (4); one end of the spring (72) is fixedly connected to the bracket (71); the other end of the spring (72) is fixedly connected to the block (74); a square hole (411) is provided on the first blocking ball (41); the block (74) is inserted into the square hole (411); and the elastic force of the spring (72) is applied to the first blocking ball (41) via the block (74).

2. The inner hole coating device according to claim 1, characterized in that: The cross-sectional areas of the liquid inlet hole (421) and the air extraction hole (422) gradually increase in a direction away from the inner hole (20); a first V-shaped transition groove (401) and a second V-shaped transition groove (402) are provided on the surface of the mold rod (4); the first V-shaped transition groove (401) is respectively connected to the openings of the inner hole (20) and the liquid inlet hole (421); and the second V-shaped transition groove (402) is respectively connected to the openings of the inner hole (20) and the air extraction hole (422).

3. The inner hole coating device according to claim 1, characterized in that: The mold rod (4) further comprises two fixing blocks (441), wherein the fixing blocks (441) are fixed with an inserting block (442), and an outer surface of the abutting cylinder (51) is provided with an inserting hole (511) for the inserting block (442) to be inserted radially along the mold rod (4). When the inserting block (442) is inserted into the inserting hole (511), the two fixing blocks (441) respectively abut against the ends of the first stopper rod (43) and the second stopper rod (44).

4. The inner hole coating device according to claim 1, characterized in that: The fixing device (2) comprises a turntable (213), a positioning plate (214), and a guide plate (21) with a notch. The guide plate (21) is mounted on the base (1). The turntable (213) is used to be mounted on the lower surface of the annular workpiece (10). The turntable (213) and the guide plate (21) are rotatably connected. The positioning plate (214) is mounted on the upper surface of the annular workpiece (10). A plurality of positioning threaded holes (216) evenly arranged around the circumference are provided on the guide plate (21). Bolts (215) are vertically penetrated through the turntable (213) and the positioning plate (214). The bolts (215) cooperate with the positioning threaded holes (216).

5. The inner hole coating device according to claim 4, characterized in that: The fixing device (2) further comprises a position adjustment mechanism, and the position adjustment mechanism is used to adjust the horizontal and height positions of the liquid injection device (3).

6. The inner hole coating device according to claim 1, characterized in that: The rotary centering device further comprises a second rotating wheel (82) provided on the fixing device (2) and a second motor (843) for driving the second rotating wheel (82) to rotate, wherein the outer peripheral surface of the second rotating wheel (82) is set as a smooth surface, the friction surface of the second rotating wheel (82) is arranged tangentially to the outer peripheral surface of the threaded sleeve (5), and the two tangent points of the threaded sleeve (5) with the first rotating wheel (81) and the second rotating wheel (82) are arranged horizontally symmetrically with respect to the axis of the threaded sleeve (5), and the rotation direction of the second rotating wheel (82) is opposite to the rotation direction of the first rotating wheel (81).

7. The inner hole coating device according to claim 1, characterized in that: The tightening direction of the threaded sleeve (5) is the same as the tightening direction of the spring (72).

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