A square tube heat exchanger inner tube sand blasting device

Abstract

The application relates to a square tube heat exchanger inner tube sand blasting device and relates to the field of heat exchanger processing equipment, which comprises a sand inlet pipe, a sand blasting pipe arranged at one end of the sand inlet pipe and an air inlet pipe fixedly communicated with the sand inlet pipe, at least two containing boxes are arranged on the sand inlet pipe along the length direction of the sand inlet pipe, the sand inlet pipe penetrates the containing boxes and is fixedly connected with the containing boxes, two driving plates are slidably connected in the containing boxes, the sand inlet pipe is located between the two driving plates, the two driving plates separate the containing boxes into three cavities, a connecting pipe communicated with the air inlet pipe is fixedly communicated with the position between the two driving plates of the containing box, and a gas leakage hole is further arranged in the position between the two driving plates of the containing box; the two driving plates are both connected with supporting rods penetrating the containing boxes on the sides far away from each other, and the two supporting rods are both provided with rollers at the ends far away from each other; and the containing box is provided with a plugging assembly for plugging the gas leakage hole. The application has the effect of improving the processing efficiency of the square tube heat exchanger.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat exchanger processing equipment, in particular to a square tube heat exchanger inner tube sand blasting device. BACKGROUND

[0002] The main body of the square tube heat exchanger is composed of a plurality of square tube arrays. In order to improve the high-temperature resistance and oxidation resistance of the heat exchanger, a layer of metal ceramic glaze is usually sprayed on the inner wall of the square tube during processing. In order to enhance the bonding strength of the metal ceramic glaze and the inner wall of the square tube, the inner wall of the square tube needs to be sandblasted before spraying. The inner wall of the square tube has a certain roughness, so that the metal ceramic glaze can be better bonded to the inner wall of the square tube.

[0003] REFERENCE Figure 1 The common pipeline inner wall sand blasting machine includes a sand inlet pipe 1, one end of the sand inlet pipe 1 is rotatably connected with a sand blasting pipe 2, and a gas inlet pipe 3 is also fixedly connected with the sand inlet pipe 1. The end of the sand inlet pipe 1 away from the sand blasting pipe 2 is connected with a pressure type sand blasting machine, and the gas inlet pipe 3 is connected with an air compressor. A plurality of threaded pipes 11 are fixed on the outer wall of the sand inlet pipe 1 along the circumferential direction of the sand inlet pipe 1, a threaded rod 12 is threadedly connected in the threaded pipe 11, and a roller 51 is installed at the end of the threaded rod 12. In use, the sand inlet pipe 1 is first placed in the square tube, the threaded rod 12 is screwed until the roller 51 contacts the side wall of the square tube, the plurality of threaded rods 12 and the rollers 51 cooperate to support the sand inlet pipe 1, then the air compressor and the pressure type sand blasting machine are started, and the sand inlet pipe 1 is pulled to move along the length direction of the square tube, so as to process the inner wall of the square tube.

[0004] Since the square tube heat exchanger has a plurality of square tubes, the plurality of threaded rods 12 need to be rotated respectively until the rollers 51 contact the inner wall of the square tube when the surface of each square tube is treated, which results in long time consumption for surface treatment of the square tube heat exchanger and low efficiency for processing the square tube heat exchanger. SUMMARY

[0005] In order to improve the efficiency of processing the square tube heat exchanger, the present application provides a square tube heat exchanger inner tube sand blasting device.

[0006] The square tube heat exchanger inner tube sand blasting device provided by the present application adopts the following technical scheme:

[0007] A square tube heat exchanger inner tube sand blasting device, comprising a sand inlet pipe, a sand blasting pipe installed at one end of the sand inlet pipe, and a gas inlet pipe fixedly connected with the sand inlet pipe, wherein the sand inlet pipe is arranged with at least two accommodating boxes along the length direction thereof, and the sand inlet pipe penetrates through the accommodating boxes and is fixedly connected therewith.

[0008] The two driving plates are slidably connected to the containing box, and the sand feeding pipe is located between the two driving plates, which divide the containing box into three cavities.

[0009] The two driving plates are slidably connected to the containing box, and the sand feeding pipe is located between the two driving plates, which divide the containing box into three cavities.

[0010] The two driving plates are slidably connected to the containing box, and the sand feeding pipe is located between the two driving plates, which divide the containing box into three cavities.

[0011] When the inner wall of the square pipe is processed, the sand feeding pipe is put into the square pipe, and the sand blasting pipe is located on the side of the sand feeding pipe close to the end point of the movement. Then, the air compressor connected to the air inlet pipe is started. The gas enters the containing box through the air inlet pipe and the connecting pipe, and the blocking assembly blocks the gas vent at the same time. The gas accumulates between the two driving plates, so that the air pressure between the two driving plates gradually increases. The driving plates move under the action of pressure difference, and the driving plates move away from each other. The driving plates drive the supporting rods to extend out of the containing box until the rollers contact the inner wall of the square pipe.

[0012] When the rollers contact the inner wall of the square pipe, the operator controls the sand blasting device to work on the inner wall of the square pipe for cleaning. When the cleaning is completed, the sand feeding pipe is located at the end of the square pipe. At this time, the operator controls the blocking assembly to work to open the gas vent. The gas between the two driving plates flows out to the outside through the gas vent. The air pressure between the two driving plates decreases. The driving plate, the supporting rod and the roller above move downward under the action of gravity. At this time, the sand feeding pipe can be taken out. Repeat the above operation until the inner wall of each square pipe is processed. The need to adjust the threaded rod when processing each square pipe is reduced. The time required to put in and take out the sand feeding pipe is reduced, and the efficiency of processing the square pipe heat exchanger is improved.

[0013] Optionally, the side wall of the two driving plates away from each other is connected with a reset spring, and the end of the reset spring away from the driving plate is connected with the inner wall of the containing box.

[0014] By adopting the above technical scheme, when the driving plate drives the supporting rod to move out of the containing box, the driving plate compresses the reset spring. When the air pressure between the two driving plates decreases, the reset spring restores the deformation and drives the supporting rod and the roller to reset, so that the roller can be better reset.

[0015] Optionally, the blocking assembly comprises a sleeve plate slidably sleeved on the sand feeding pipe, and recesses are formed in the upper and lower surfaces of the sleeve plate in the height direction. A plug-in plate is slidably inserted into each recess. The plug-in plate is slidably connected with the corresponding driving plate.

[0016] The plug-in plate and the sleeve plate cooperate to divide the space between the two drive plates into two cavities, the sleeve plate is connected with a hollow blocking block corresponding to the air release hole at one end close to the air release hole, a through hole corresponding to the blocking block is formed in the sleeve plate, the blocking block is deformable, and the diameter of the blocking block gradually decreases away from the sleeve plate.

[0017] The sleeve plate is fixedly connected with a plurality of connecting springs on the side wall away from the air release hole, and the connecting springs are fixed to the side wall corresponding to the containing box.

[0018] By adopting the above technical scheme, when the gas enters the containing box, the air pressure between the two drive plates increases, the sleeve plate and the plug-in plate move in the axial direction of the sand injection pipe under the action of the pressure difference, the sleeve plate stretches the connecting spring, and the two drive plates move away from each other, and the drive plates drive the corresponding plug-in plate to move outwards of the sleeve plate.

[0019] The movement of the sleeve plate drives the blocking block to gradually insert into the air release hole, and the hole wall of the air release hole extrudes the blocking block, so that the hollow hole of the blocking block is gradually closed; when the blocking block abuts against the hole wall of the air release hole, the movement of the blocking block, the sleeve plate and the plug-in plate stops, and at this time, the hollow hole of the blocking block is closed, so that the gas can better accumulate in the containing box, thereby better providing power for the movement of the drive plate.

[0020] When it is necessary to release the containing box, the blocking block is pushed into the containing box, so that the hollow hole of the blocking block is opened, the gas in the containing box flows out of the containing box through the blocking block and the air release hole, the air pressure in the containing box decreases, and at the same time, the connecting spring restores the deformation and pulls the sleeve plate, the plug-in plate and the blocking block to reset.

[0021] Optionally, the blocking block is a blocking block made of rubber.

[0022] By adopting the above technical scheme, the material hardness of the blocking block is lower than the material hardness of the containing box, so that the wear of the containing box caused by frequent contact between the blocking block and the containing box is reduced.

[0023] Optionally, the plug-in plate is fixedly connected with a sliding block in the shape of T on the surface close to the drive plate, the drive plate is provided with a sliding groove adapted to the sliding block on the surface close to the sand injection pipe, the length direction of the sliding groove is arranged in the axial direction of the sand injection pipe, and the sliding block is slidingly plugged into the corresponding sliding groove.

[0024] By adopting the above technical scheme, the sliding block and the sliding groove cooperate to slidingly connect the plug-in plate and the drive plate.

[0025] Optionally, the containing box is provided with a stop component for stopping the air outlet of the blocking connection pipe.

[0026] By adopting the technical scheme, when the roller contacts the inner wall corresponding to the square tube, the stop component works to block the gas outlet of the connecting tube, so that more gas discharged by the air compressor can be used for abrasive ejection, and the adverse effect on abrasive ejection is reduced.

[0027] Optionally, the stop component comprises a stop plate for blocking the gas outlet of the connecting tube, the stop plate is hinged to the inner side wall of the containing box communicating with the connecting tube, a limiting spring is connected to the side wall of the sand inlet pipe, the limiting spring is connected to the stop plate, so that the stop plate is located on one side of the gas outlet of the connecting tube, and the containing box is provided with a driving member for driving the stop plate to rotate to block the gas outlet of the connecting tube.

[0028] By adopting the technical scheme, when the connecting tube communicates with the containing box, the stop plate is located on one side of the gas outlet of the connecting tube, and the limiting spring limits the stop plate at this time; when it is needed to block the gas outlet of the connecting tube by the stop plate, the driving member is started, the driving member controls the stop plate to rotate, and the stop plate stretches the limiting spring at the same time; when it is needed to make the connecting tube communicate with the containing box, the driving member is controlled to work, so that the stop plate rotates to the initial position until the stop plate is reset.

[0029] Optionally, the number of the containing boxes is two, the driving member comprises a steel wire rope fixed on the stop plate, the steel wire rope penetrates through the side wall of the containing box close to the connecting tube, a threaded rotating rod is rotatably connected to the sand inlet pipe, the lower end of the rotating rod is threadedly connected with a sleeve, and one end of the pull rope outside the containing box is fixed on the sleeve.

[0030] By adopting the technical scheme, when the connecting tube communicates with the containing box, the stop plate is located on one side of the gas outlet of the connecting tube, and the limiting spring limits the stop plate at this time; when it is needed to block the gas outlet of the connecting tube by the stop plate, the driving member is started, the driving member controls the stop plate to rotate, and the stop plate stretches the limiting spring at the same time; when it is needed to make the connecting tube communicate with the containing box, the driving member is controlled to work, so that the stop plate rotates to the initial position until the stop plate is reset.

[0031] When it is needed to make the connecting tube communicate with the containing box, the sleeve is limited to rotate and the rotating rod is rotated, so that the sleeve drives the steel wire rope to move upwards, and the limiting spring restores the deformation and drives the stop plate to rotate at the same time; when the stop plate is reset, the rotating rod is stopped.

[0032] In summary, the present application has at least one of the following beneficial technical effects:

[0033] By arranging the sand inlet pipe, the sand ejection pipe, the air inlet pipe, the connecting tube, the containing box, the air leakage hole, the driving plate and the blocking component, the efficiency of processing the square tube heat exchanger is improved.

[0034] By setting the sleeve plate, the plug-in plate, the connecting spring and the blocking block, the gas in the containing box can be discharged;

[0035] By setting the stop plate, the limiting spring and the driving piece, the opening and closing of the gas outlet of the connecting pipe can be controlled. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a schematic diagram of the overall structure of the sand blasting device in the related art.

[0037] Figure 2 is a schematic diagram of the overall structure of the sand blasting device in the embodiment of the present application.

[0038] Figure 3 is a sectional view of the overall structure of the sand blasting device in the embodiment of the present application.

[0039] Figure 4 is a sectional view of the overall structure of the blocking assembly in the embodiment of the present application.

[0040] Figure 5 is an enlarged view of the structure at A in Figure 4

[0041] Figure 6 is a sectional view of the position relationship between the stop plate and the containing box in the embodiment of the present application.

[0042] Reference signs: 1, sand inlet pipe; 11, threaded pipe; 12, threaded rod; 2, sand blasting pipe; 3, air inlet pipe; 4, containing box; 41, air vent; 5, support rod; 51, roller; 6, power assembly; 61, driving plate; 611, sliding groove; 62, return spring; 63, connecting pipe; 7, blocking assembly; 71, sleeve plate; 711, groove; 72, plug-in plate; 721, sliding block; 73, connecting spring; 74, blocking block; 8, stop assembly; 81, stop plate; 82, protrusion; 83, limiting spring; 84, driving piece; 841, steel wire rope; 842, rotating rod; 843, sleeve. EMBODIMENT

[0043] The following will be described in detail with reference to the accompanying drawings. Figures 2-6 The present application will be further described in detail.

[0044] The embodiment of the present application discloses a square tube heat exchanger inner tube sand blasting device. Referring to Figure 2 ​The sand feeding pipe 1 is rotatably connected with the sand blasting pipe 2 at one end, and the air inlet pipe 3 is fixedly connected with the sand feeding pipe 1; the air inlet of the air inlet pipe 3 is communicated with the air outlet of the air compressor.

[0045] With reference to Figure 2 With reference to Figure 3 The upper and lower surfaces of the containing box 4 are vertically slidably connected with a plurality of supporting rods 5; in the embodiment, two supporting rods 5 are arranged on the upper and lower surfaces of the containing box 4, and the outer ends of the supporting rods 5 are rotatably connected with the rolling wheels 51; the supporting mechanism further comprises a power assembly 6 for driving the supporting rods 5 to slide along the height direction.

[0046] With reference to Figure 3 With reference to Figure 4 The power assembly 6 comprises two driving plates 61 slidably connected with the containing box 4; the two driving plates 61 are located between the two supporting rods 5, and the inner ends of the supporting rods 5 are fixedly connected with the driving plates 61; the supporting rods 5 are sleeved with the reset springs 62, one end of the reset springs 62 is fixedly connected with the driving plates 61, and the other end of the reset springs 62 is fixedly connected with the corresponding inner wall of the containing box 4; each side wall of the driving plate 61 is in contact with the corresponding side wall of the containing box 4, the sand feeding pipe 1 is located between the two driving plates 61, and the two driving plates 61 divide the containing box 4 into three cavities.

[0047] The two containing boxes 4 are fixedly connected with the connecting pipes 63 on the sides close to each other, the connecting pipes 63 are connected with the containing boxes 4 between the two driving plates 61, and the ends of the connecting pipes 63 away from the containing boxes 4 are fixedly connected with the air inlet pipe 3; the side walls of the two containing boxes 4 away from each other are provided with the air release holes 41, and the air release holes 41 are also located between the two driving plates 61.

[0048] With reference to Figure 3 With reference to Figure 4 The containing box 4 is provided with the plugging assembly 7 for plugging the air release holes 41; the plugging assembly 7 comprises the sleeve plate 71 located between the two driving plates 61, and the sand feeding pipe 1 penetrates through the sleeve plate 71 and is slidably connected with the sleeve plate 71; the upper and lower surfaces of the sleeve plate 71 are provided with the grooves 711, and the upper and lower sides of the sleeve plate 71 are provided with the insertion plates 72, and each insertion plate 72 is slidably connected in the corresponding groove 711.

[0049] With reference to Figure 4 With reference to Figure 5The mutually distanced surfaces of the two plug-in plates 72 are fixedly connected with T-shaped sliding blocks 721, and the surface of the driving plate 61 close to the plug-in plate 72 is provided with sliding grooves 611 matched with the sliding blocks 721, and the length direction of the sliding grooves 611 is arranged along the axial direction of the sand inlet pipe 1, and each sliding block 721 is slidingly inserted into the corresponding sliding groove 611.

[0050] With reference to Figure 3 With Figure 4 The mutually close surfaces of the plug-in plate 72 and the driving plate 61 are in contact, and the short side walls of the plug-in plate 72 and the sleeve plate 71 are also in contact with the corresponding side walls of the containing box 4, and the sleeve plate 71 cooperates with the two plug-in plates 72 to divide the space between the two driving plates 61 into two cavities; a plurality of connecting springs 73 are fixedly connected to the side wall of the sleeve plate 71 close to the connecting pipe 63, and the ends of the connecting springs 73 away from the sleeve plate 71 are fixedly connected to the inner side wall of the containing box 4 close to the connecting pipe 63, and in the initial state, the connecting springs 73 limit the sleeve plate 71 and the plug-in plate 72, so that the sleeve plate 71 and the plug-in plate 72 are located in the middle part of the containing box 4.

[0051] The sleeve plate 71 is fixedly connected with a hollow plugging block 74, and the sleeve plate 71 is provided with through holes in communication with the hollow holes of the plugging block 74, the diameter of the plugging block 74 gradually decreases away from the sleeve plate 71, the diameter of the end of the plugging block 74 away from the sleeve plate 71 is smaller than the hole diameter of the air leakage hole 41, and the diameter of the end of the plugging block 74 close to the sleeve plate 71 is larger than the hole diameter of the air leakage hole 41, and in the embodiment, the material of the plugging block 74 is rubber; the sleeve plate 71 is provided with through holes in communication with the plugging block 74, so that the cavities on both sides of the sleeve plate 71 are communicated.

[0052] With reference to Figure 3 With Figure 6 The containing box 4 further comprises a stopping assembly 8 for plugging the gas outlet of the connecting pipe 63 to stop the gas from entering the containing box 4, and the stopping assembly 8 comprises a stopping plate 81 for plugging the gas outlet of the connecting pipe 63, the stopping plate 81 is hingedly connected to the inner side wall of the stopping plate 81 close to the connecting pipe 63, and the rotation axis of the stopping plate 81 is arranged along the axial direction of the sand inlet pipe 1.

[0053] The inner side wall of the containing box 4 close to the connecting pipe 63 is fixedly connected with a protruding block 82, the protruding block 82 is located on one side of the stopping plate 81, and a limiting spring 83 is arranged between the protruding block 82 and the stopping plate 81, one end of the limiting spring 83 is fixedly connected to the side wall of the protruding block 82 close to the stopping plate 81, and the other end of the limiting spring 83 is fixedly connected to the side wall of the stopping plate 81 close to the protruding block 82; when the limiting spring 83 is not subjected to external force, the limiting spring 83 makes the stopping plate 81 located on one side of the gas outlet of the connecting pipe 63, and at this time, the connecting pipe 63 is communicated with the containing box 4.

[0054] The stop assembly 8 further comprises a driving member 84 for controlling the rotation of the stop plate 81 and the opening and closing of the outlet of the connecting pipe 63. The driving member 84 comprises a steel wire rope 841 fixed to the side wall of the stop plate 81 away from the protrusion 82. The steel wire rope 841 penetrates the side wall of the containing box 4 close to the connecting pipe 63, and the position of the steel wire rope 841 penetrating the containing box 4 is between the two driving plates 61.

[0055] The driving member 84 further comprises a rotating rod 842 between the two containing boxes 4. The rotating rod 842 is below the air inlet pipe 3. The upper end of the rotating rod 842 is rotationally connected to the outer side wall of the sand inlet pipe 1. A thread is formed on the outer side wall of the rotating rod 842. A sleeve 843 is threadedly connected to the rotating rod 842. One end of the steel wire rope 841 outside the containing box 4 is fixed to the lower end face of the sleeve 843. When the limiting spring 83 is not subjected to external force, the steel wire rope 841 is in a taut state.

[0056] When the inner side wall of the square pipe needs to be processed, the operator first places the sand inlet pipe 1 at one end of the square pipe, and the sand blasting pipe 2 is located at the side of the sand inlet pipe 1 close to the end point of the movement. Then, the air compressor is started. The air compressor inputs gas into the containing box 4 through the air inlet pipe 3 and the connecting pipe 63. The gas entering the containing box 4 accumulates in the space surrounded by the two driving plates 61 and the sleeve plate 71 close to the connecting pipe 63. As the gas gradually increases, the air pressure close to the connecting pipe 63 of the sleeve plate 71 gradually increases. The sleeve plate 71 and the plug-in plate 72 move the blocking block 74 in the direction close to the air vent 41 under the action of the pressure difference. The sleeve plate 71 stretches the connecting spring 73 while moving.

[0057] Since the diameter of the end of the blocking block 74 close to the air vent 41 is smaller than the diameter of the air vent 41, the blocking block 74 can better enter the air vent 41. As the blocking block 74 continues to move into the air vent 41, the hole wall of the air vent 41 extrudes the side wall of the blocking block 74, causing the hollow hole of the blocking block 74 to gradually close.

[0058] When the blocking block 74 is clamped with the hole wall of the air vent 41, the hollow hole of the blocking block 74 is closed. At this time, the sleeve plate 71 and the plug-in plate 72 stop moving, the blocking block 74 blocks the air vent 41, and the gas accumulates in the containing box 4. At the same time, due to the increase of the air pressure between the two driving plates 61, the driving plate 61 moves the two driving plates 61 in the direction away from each other under the action of the air pressure. The movement of the driving plate 61 drives the corresponding plug-in plate 72 to move.

[0059] The movement of the driving plate 61 compresses the return spring 62. The driving plate 61 moves the support rod 5 and the roller 51 at the same time, so that the roller 51 moves in the direction close to the corresponding inner wall of the square pipe. When the roller 51 contacts the corresponding inner wall of the square pipe, the roller 51 and the support rod 5 limit the driving plate 61 from continuing to move.

[0060] The operator rotates the sleeve 843 and rotates the rotating rod 842. The rotating rod 842 rotates to drive the sleeve 843 to move the steel wire rope 841 downward. The steel wire rope 841 moves and pulls the stop plate 81 to rotate, so that the stop plate 81 gradually blocks the gas outlet of the connecting pipe 63, more gas can enter the sand blasting device, so as to better provide power for the abrasive ejection. At the same time, the stop plate 81 stretches the limiting spring 83.

[0061] When the stop plate 81 blocks the gas outlet of the connecting pipe 63, the operator stops rotating the rotating rod 842, the blocking block 74 blocks the air hole 41, the stop plate 81 blocks the gas outlet of the connecting pipe 63, and the gas pressure in the containing box 4 remains unchanged; at this time, the pressure type sand blasting machine is started, and the air compressor provides pressure for the sand blasting device through the air inlet pipe 3, so that the abrasive in the sand blasting pipe 2 is ejected.

[0062] When a square tube is processed, the sand inlet pipe 1 is located at the end of the square tube. At this time, the operator pushes the two blocking blocks 74 to move towards each other. With the movement of the blocking block 74, the hollow hole of the blocking block 74 is gradually opened. At this time, the gas between the two driving plates 61 can flow to the outside through the blocking block 74 and the air hole 41. The air pressure between the two stop plates 81 is reduced, the connecting spring 73 restores the deformation and pulls the sleeve plate 71, the plug-in plate 72 and the blocking block 74 to move into the containing box 4.

[0063] With the gradual reduction of the air pressure in the containing box 4, the reset spring 62 restores the deformation and pushes the driving plate 61, the supporting rod 5 and the roller 51 to move, so that the two driving plates 61 move towards each other. The roller 51 moves and is out of contact with the inner wall of the square tube. At this time, the operator can take out the sand blasting device from the square tube.

[0064] When the sand blasting device is placed in the square tube again, the operator fixes the sleeve 843 and rotates the rotating rod 842 to make the sleeve 843 drive the steel wire rope 841 to move upward, and at the same time, the limiting spring 83 restores the deformation and pulls the stop plate 81 to rotate, so that the gas outlet of the connecting pipe 63 is opened. The operator starts the air compressor to move the roller 51 until the roller 51 is in contact with the inner wall of the square tube again.

[0065] Fix the sleeve 843 again, rotate the rotating rod 842 until the stop plate 81 blocks the gas outlet of the connecting hole. At this time, the support of the sand inlet pipe 1 and the sand blasting pipe 2 is completed again, which reduces the need for the operator to adjust multiple threaded rods 12 when processing each square tube, shortens the time required for taking out and placing the sand inlet pipe 1, and improves the efficiency of processing square tube heat exchanger.

[0066] The implementation principle of the sand blasting device for the inner tube of the square tube heat exchanger is as follows: when the inner wall of the square tube needs to be cleaned, first, the near sand inlet pipe 1 is placed in the square tube, the control sleeve 843 is controlled, and the rotating rod 842 is rotated, so that the limit spring 83 restores the deformation and pulls the stop plate 81 to rotate, so that the gas outlet of the connecting pipe 63 is opened, then the air compressor is turned on, and the gas enters the containing box 4 through the air inlet pipe 3 and the connecting pipe 63; as the gas pressure in the containing box 4 gradually increases, the sleeve plate 71 and the plug-in plate 72 drive the blocking block 74 to move under the action of the gas pressure, so that the blocking block 74 is plugged into the air vent hole 41, the hollow hole of the blocking block 74 is closed, and at the same time, the gas pressure in the containing box 4 continues to increase, so that the two drive plates 61 drive the corresponding rollers 51 to move, until the rollers 51 contact the inner wall of the square tube.

[0067] The control sleeve 843 is limited and the rotating rod 842 is rotated, so that the stop plate 81 is rotated and the gas outlet of the connecting pipe 63 is blocked, then the operator controls the sand blasting device to process the inner wall of the square tube; when the processing is completed, the sand inlet pipe 1 is located at one end of the square tube, at this time, the blocking block 74 is pushed into the containing box 4, so that the gas in the containing box 4 flows out of the containing box 4 through the blocking block 74 and the air vent hole 41, at this time, the reset spring 62 and the connecting spring 73 restore the deformation and drive the drive plate 61, the sleeve plate 71, the connecting plate and the roller 51 to reset, and the operator can take out the sand blasting device.

[0068] The above are preferred embodiments of the present application, and are not limited to the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A sandblasting device for the inner tube of a square tube heat exchanger, comprising a sand inlet pipe (1), a sandblasting pipe (2) installed at one end of the sand inlet pipe (1), and an air inlet pipe (3) fixedly connected to the sand inlet pipe (1), characterized in that: At least two receiving boxes (4) are arranged along the length of the sand inlet pipe (1), and the sand inlet pipe (1) passes through the receiving box (4) and is fixedly connected to it; The receiving box (4) has two drive plates (61) slidably connected. The sand inlet pipe (1) is located between the two drive plates (61). The two drive plates (61) divide the receiving box (4) into three cavities. The receiving box (4) located between the two drive plates (61) is fixedly connected to a connecting pipe (63) that is connected to the air inlet pipe (3). The receiving box (4) located between the two drive plates (61) is also provided with a vent hole (41). The two drive plates (61) are connected to a support rod (5) that passes through the receiving box (4) on the side that is far apart from each other, and a roller (51) is installed at the end of the two support rods (5) that is far apart from each other. The container (4) is provided with a sealing component (7) that seals the vent hole (41); The sealing assembly (7) includes a sleeve plate (71) that is slidably sleeved on the sand inlet pipe (1). Grooves (711) are provided on the upper and lower surfaces of the sleeve plate (71) along the height direction. A plug plate (72) is slidably inserted into each groove (711). The plug plate (72) is slidably connected to the corresponding drive plate (61). The plug plate (72) and the sleeve plate (71) cooperate to divide the space between the two drive plates (61) into two cavities. The sleeve plate (71) is connected to a hollow sealing block (74) corresponding to the vent hole (41) at one end. The sleeve plate (71) has a through hole that communicates with the sealing block (74). The sealing block (74) is deformable. The diameter of the sealing block (74) gradually decreases in the direction away from the sleeve plate (71). A number of connecting springs (73) are fixedly connected to the side wall of the sleeve (71) away from the vent (41), and the connecting springs (73) are fixed to the side wall of the receiving box (4). The plug plate (72) has a T-shaped slider (721) fixedly connected to the surface near the drive plate (61). The drive plate (61) has a groove (611) that matches the slider (721) on the surface near the sandblasting pipe (2). The length direction of the groove (611) is set along the axial direction of the sandblasting pipe (2), and the slider (721) is slidably inserted into the corresponding groove (611).

2. The sandblasting device for the inner tube of a square tube heat exchanger according to claim 1, characterized in that: Two drive plates (61) are connected to a return spring (62) on their sidewalls that are far apart from each other. The end of the return spring (62) that is far away from the drive plate (61) is connected to the inner wall of the receiving box (4).

3. The sandblasting device for the inner tube of a square tube heat exchanger according to claim 2, characterized in that: The sealing block (74) is a sealing block (74) made of rubber.

4. A sandblasting device for the inner tube of a square tube heat exchanger according to any one of claims 1 to 3, characterized in that: The receiving box (4) is provided with a stop assembly (8) that blocks the air outlet of the connecting pipe (63).

5. The sandblasting device for the inner tube of a square tube heat exchanger according to claim 4, characterized in that: The stop assembly (8) includes a stop plate (81) for blocking the air outlet of the connecting pipe (63). The stop plate (81) is hinged to the inner wall of the receiving box (4) connecting the connecting pipe (63). A limit spring (83) is connected to the side wall of the sand inlet pipe (1). The limit spring (83) is connected to the stop plate (81) so that the stop plate (81) is located on one side of the air outlet of the connecting pipe (63). The receiving box (4) is provided with a drive (84) that drives the stop plate (81) to rotate so as to block the air outlet of the connecting pipe (63).

6. The sandblasting device for the inner tube of a square tube heat exchanger according to claim 5, characterized in that: The number of the receiving boxes (4) is two. The driving component (84) includes a steel wire rope (841) fixed on the stop plate (81). The steel wire rope (841) passes through the side wall of the receiving box (4) near the connecting pipe (63). A threaded rotating rod (842) is rotatably connected to the sand inlet pipe (1). A sleeve (843) is threadedly connected to the lower end of the rotating rod (842). One end of the pull rope located outside the receiving box (4) is fixed to the sleeve (843).

Images