CN211696695U - Power distribution cabinet detection device - Google Patents

Abstract

The utility model relates to a switch board overhauls the technical field of equipment for, disclose a switch board detection device, including thermal infrared imager and the preheating hole of setting on thermal infrared imager, still include the detachable gas needle of establishing on preheating the hole of inserting, be provided with the closing mechanism who is used for controlling gas needle output closed state on the gas needle, the gas needle has the hot gas source mechanism who is used for producing the hot gas flow through hose connection, still including the preheating control ware that is used for controlling closing mechanism and hot gas source mechanism work, the thermal infrared imager sets firmly the wireless temperature sensor who is used for providing temperature data for preheating the control ware, the last miniature relief valve that has set firmly of thermal infrared imager. The utility model discloses have and preheat the process through wireless temperature sensor and preheating controller automatic monitoring to the operation is preheated in the automatic end, preheats efficiently, effect that detection efficiency is high.

Description

Power distribution cabinet detection device

Technical Field

The utility model belongs to the technical field of the technique of switch board maintenance equipment and specifically relates to a switch board detection device is related to.

Background

The power distribution cabinet is final-stage equipment of a power distribution system and is an important component of the power distribution system. The switch board comprises the cabinet body and the various electrical components that set up in the cabinet body usually, and whether electrical components overheat load can direct influence distribution system's normal operating in the switch board, so the user need regularly detect the condition of generating heat of switch board to confirm whether need maintenance and maintenance means according to the testing result.

The prior utility model patent document with the publication number of CN206146534U discloses a power distribution cabinet detection device, which comprises an infrared thermal imager, a shell and a first bracket, wherein N preheating holes are uniformly distributed on the surface of the infrared thermal imager, a hole cover is arranged at the preheating holes, a drying layer is arranged on the inner wall of the infrared thermal imager, and two ends of the first bracket are respectively in threaded connection with the infrared thermal imager and the shell; an electric heating rod is fixed at the middle part in the shell, an electric fan is fixed at the bottom in the shell, the upper end of the shell is open, an air inlet at the lower end of a gas collecting hood is connected with the open end of the shell, an air outlet at the upper end of the gas collecting hood is connected with one end of an exhaust main pipe, the other end of the exhaust main pipe is connected with N exhaust branch pipes through a flow divider, the other ends of the N exhaust branch pipes are respectively connected with N gas needles, a drying layer is arranged on the inner wall of the exhaust main pipe, and a filter; the electric heating rod and the electric fan are both connected with the storage battery through the first switch.

When the thermal infrared imager needs to be used, the electric heating rod is heated, the electric fan drives the hot air heated by the electric heating rod to enter the air needle after passing through the air collecting cover, the exhaust main pipe, the flow divider and the exhaust branch pipe, and the air needle is inserted into the preheating hole, so that the hot air in the air needle enters the thermal infrared imager, the rapid preheating of the thermal infrared imager is realized, the preheating efficiency of the thermal infrared imager is effectively improved, and the detection efficiency is improved.

The above prior art solutions have the following drawbacks: after the gas needle is inserted into the preheating hole, the user needs to automatically judge the time point of the preheating completion, and then manually pull out the gas needle or turn off the electric heating rod and the electric fan, so that the automatic judgment of the time point is troublesome. If the time point judgment is too early, the preheating degree of the thermal infrared imager is insufficient; if the judgment of the time point is too late, the thermal infrared imager is easy to damage due to excessive preheating; the difficulty of self-judging the time point is high. Therefore, the preheating operation of the technical scheme is troublesome, and the detection efficiency is not high.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing a switch board detection device, detect with thermal infrared imager preheat efficient and preheat easy operation.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme: switch board detection device, including thermal infrared imager and the preheating hole of setting on thermal infrared imager, still include the detachable gas needle of establishing on preheating the hole of inserting, be provided with the closing mechanism who is used for controlling gas needle output closed condition on the gas needle, the gas needle has the hot gas source mechanism who is used for producing the hot gas flow through the hose connection, still including the preheating control ware that is used for controlling closing mechanism and hot gas source mechanism work, thermal infrared imager internal stability is equipped with and is used for providing the wireless temperature sensor of temperature data for preheating the controller, the last miniature relief valve that has set firmly of thermal infrared imager.

Through adopting above-mentioned technical scheme, the user passes through the temperature in the wireless temperature sensor real time monitoring thermal infrared imager, thereby control thermal infrared imager's the process of preheating, realize the preheating process in the thermal infrared imager that the hot gas stream pours into through hot gas source mechanism and gas needle, realize the pressure release protection of preheating the in-process through miniature relief valve, realize preheating the automatic judgement of accomplishing the time point and the automatic shutdown of the hot gas stream process of pouring into through preheating controller and wireless temperature sensor, remove the trouble of artifical management and control from, thermal infrared imager is difficult for excessively preheating or preheating inadequately, preheat efficiently, switch board detection efficiency is high.

The present invention may be further configured in a preferred embodiment as: the number of the wireless temperature sensors is not less than two, and the wireless temperature sensors are dispersedly arranged in the thermal infrared imager.

By adopting the technical scheme, the plurality of wireless temperature sensors jointly detect the internal temperature of the thermal infrared imager, after the internal complete preheating of the thermal infrared imager is finished, the pouring and the manufacturing of hot air flow can be stopped, and the preheating process is judged more accurately.

The present invention may be further configured in a preferred embodiment as: the sealing mechanism is including setting firmly the closed box on the tip that the preheating hole was kept away from to the gas needle and was located the thermal infrared imager outside, be provided with the gas channel of walking of intercommunication gas needle and heat source mechanism in the closed box, it is connected with the closing piece to walk the axial direction of gas channel to slide along the perpendicular to in the closed box, it has the closed passage who slides and be connected with the closing piece to walk gas channel intercommunication, closed passage internal stability has been used for driving the closing piece to walking the closed spring that the gas channel slided, closed passage internal stability has set firmly the electro-magnet, the tip that the gas channel was kept away from to the closing piece corresponds the electro-magnet and has set firmly the metal and inhales the.

By adopting the technical scheme, the sliding of the sealing block is controllable by the magnetic adsorption of the electromagnet and the metal suction sheet and the elasticity of the sealing spring, the control of the blocking condition of the air channel is realized by the change of the sliding position of the sealing block, the control of whether the output end of the air needle is sealed or not is realized, and the control of whether hot air is filled conveniently or not is realized.

The present invention may be further configured in a preferred embodiment as: the gas needle is arranged in a stepped shaft shape, a wedge-shaped block is connected in the preheating hole in a sliding manner along the radial direction of the preheating hole, the number of the wedge-shaped blocks is two, the wedge-shaped blocks are symmetrically arranged on the inner periphery of the preheating hole, the air needle is symmetrically provided with clamping grooves which are clamped with the wedge-shaped blocks, the preheating hole is communicated with a locking groove connected with the wedge block in a sliding way, a locking spring for driving the wedge block to slide relatively is fixedly arranged in the locking groove, the thermal infrared imager is fixedly provided with a preheating column, the preheating hole and the locking groove are both arranged on the preheating column, a locking ring is sleeved on the preheating column and is rotationally connected with the preheating column, a traction groove communicated with the locking groove is arranged on the inner periphery of the locking ring, two traction ropes are arranged in the traction groove corresponding to the two wedge-shaped blocks, one end of each traction rope is fixed to the inner bottom surface of the traction groove, and the other end of each traction rope is fixed to the wedge-shaped block.

Through adopting above-mentioned technical scheme, the control of sliding of wedge is realized with the elasticity of locking spring through pulling of haulage rope, and when the gas needle inserted and preheats downtheholely, the wedge was automatic to slide and with block groove gomphosis, the gas needle with preheat the hole automatic fixation, the gas needle can be extracted to rotatory locking collar, the gas needle with preheat the hole and tear a ann convenience, convenient to use.

The present invention may be further configured in a preferred embodiment as: touch switch has set firmly on the ladder face of gas needle, touch switch is connected with the controller electricity of electro-magnet.

By adopting the technical scheme, the output end of the air needle is closed in a normal state, impurities such as dust and the like are effectively prevented from being mixed into hot air flow for preheating, when the air needle is inserted into the preheating hole, the closed state of the output end of the air needle is automatically changed by touching the switch, and the air needle is more convenient to use.

The present invention may be further configured in a preferred embodiment as: and a sealing ring is fixedly arranged on the inner wall of the preheating hole, and the sealing ring is in interference fit with the small-diameter end of the gas needle when the gas needle is fixedly arranged in the preheating hole.

By adopting the technical scheme, the sealing ring effectively prevents hot air from escaping from the gap between the air needle and the preheating hole, and the utilization rate of the hot air is high.

The present invention may be further configured in a preferred embodiment as: the rubber plug is used for sealing the preheating hole and is in interference embedding with the preheating hole when the preheating hole is sealed.

Through adopting above-mentioned technical scheme, when the user need not use the gas needle, the accessible rubber buffer seals the preheating hole, and the rubber buffer passes through frictional force with the preheating hole and fixes, and it is convenient to tear open ann, and thermal imaging system's protectiveness is good.

The present invention may be further configured in a preferred embodiment as: the hot gas source mechanism comprises a hot gas box and a heating rod fixedly arranged in the hot gas box, a driving fan used for controlling the movement of hot gas flow is fixedly arranged on the hot gas box, and the hot gas box is connected with a plurality of gas needles in parallel.

Through adopting above-mentioned technical scheme, through heating rod heated air, make the hot gas flow through the drive fan, convenient to use.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the monitoring and automatic intervention of the preheating process are realized through the wireless temperature sensor and the preheating controller, the trouble of manually judging the preheating ending time point and manually stopping preheating is avoided, the preheating efficiency is high, and the detection efficiency is high;

2. the automatic fixation of the gas needle inserted into the preheating hole and the convenient disassembly and assembly of the gas needle are realized through the sliding structure of the wedge-shaped block and the sliding control element, and the use is more convenient.

Drawings

Fig. 1 is a schematic view of the overall structure of the embodiment.

Fig. 2 is a sectional view of the internal structure of the air passage according to the embodiment.

Fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.

Fig. 4 is a partially enlarged schematic view of a portion B in fig. 2.

Fig. 5 is a schematic structural view of the rubber stopper of the specific embodiment.

Fig. 6 is a cross-sectional view of an internal structure of a hot gas box according to an embodiment.

In the figure, 1, an infrared thermal imager; 11. preheating columns; 12. preheating holes; 121. a seal ring; 13. a miniature pressure relief valve; 14. a wireless temperature sensor; 2. a preheating controller; 3. air needle; 31. a touch switch; 32. a clamping groove; 4. a sealing mechanism; 41. a closure box; 411. a gas passage; 412. closing the channel; 42. a sealing block; 43. a closing spring; 44. an electromagnet; 45. a metal suction sheet; 5. a hot gas source mechanism; 51. a hot gas box; 52. a heating rod; 53. driving a fan; 54. connecting a bracket; 61. a wedge block; 62. a locking groove; 63. a locking spring; 64. a locking ring; 641. a traction groove; 65. a hauling rope; 7. and a rubber plug.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, for the utility model discloses a switch board detection device, including thermal infrared imager 1 and four preheating columns 11 of setting on the thermal infrared imager 1 back, still include gas needle 3, hot gas source mechanism 5, closing mechanism 4 in order to preheat controller 2. The air needle 3 is communicated with the interior of the thermal infrared imager 1, and the preheating column 11 is provided with a preheating hole 12 inserted with the air needle 3. The air needle 3 is connected with the hot air source mechanism 5 through a hose, the hot air source mechanism 5 can be used for a user to convey hot air flow to the air needle 3, and the closing mechanism 4 is used for controlling whether the output end of the air needle 3 is closed or not. The thermal infrared imager 1 is fixedly provided with a miniature pressure release valve 13, and the miniature pressure release valve 13 is automatically opened for pressure release when the air pressure in the thermal infrared imager 1 is overlarge.

Referring to fig. 2 and 3, the closing mechanism 4 includes a closing box 41 fixed to the end of the gas needle 3, the closing box 41 being located between the gas needle 3 and the hot gas source mechanism 5. An air passage 411 for communicating the air needle 3 and the hot air source mechanism 5 is arranged in the sealing box 41, and the cross section of the air passage 411 is circular. The air passage 411 is communicated with a closed passage 412, and the axial direction of the closed passage 412 is parallel to the radial direction of the air passage 411. A sealing block 42 for sealing the air outlet passage 411 is connected in the sealing passage 412 in a sliding manner along the axial direction of the sealing passage 412, and a sealing spring 43 and an electromagnet 44 are arranged at one end of the sealing passage 412 far away from the air outlet passage 411. One end of the closed spring 43 is fixedly connected with the closed channel 412, the other end of the closed spring 43 is fixedly connected with the closed block 42, and the elastic force of the closed spring 43 drives the closed block 42 to slide towards the air passage 411. A metal suction sheet 45 is fixedly arranged at one end of the sealing block 42 far away from the air channel 411, and the metal suction sheet 45 is arranged opposite to the electromagnet 44.

Referring to fig. 2, a plurality of wireless temperature sensors 14 are fixedly arranged on the inner side wall of the thermal infrared imager 1, and the wireless temperature sensors 14 are dispersedly arranged. The wireless temperature sensor 14 detects the internal temperature of the thermal infrared imager 1 in real time and wirelessly transmits the temperature data to the preheating controller 2. The preheating controller 2 is electrically connected with the controller of the electromagnet 44, and the preheating controller 2 can control the working state of the hot air source mechanism 5.

The user produces a hot air flow by the hot air source mechanism 5 and drives the hot air flow toward the plurality of air needles 3. The hot air flow enters the thermal infrared imager 1 after passing through the air outlet channel 411 and the air needle 3, and heat is conducted through contact with internal elements of the thermal infrared imager 1, so that the thermal infrared imager 1 is quickly preheated. When the air pressure in the thermal infrared imager 1 is too high due to the entering of too much hot air, the micro pressure release valve 13 automatically releases the pressure and protects the thermal infrared imager 1.

When the wireless temperature sensor 14 detects that the temperature in the thermal infrared imager 1 rises to a specified value, the preheating controller 2 which acquires the signal changes the energization state of the electromagnet 44, and changes the working state of the hot gas source mechanism 5. The electromagnet 44 is separated from the metal suction sheet 45, and the elastic force of the sealing spring 43 drives the sealing block 42 to slide to the sealing air channel 411. The hot air source mechanism 5 stops producing hot air flow, and residual hot air flow cannot enter the thermal infrared imager 1 due to the sealing of the air outlet channel 411 and the output end of the air needle 3. The operation avoids the trouble of manually judging the completion of preheating, and the preheating process is automatically stopped, so that the operation is convenient. The arrangement of the plurality of wireless temperature sensors 14 enables temperature data to be more accurate, the judgment of the preheating completion time point to be more accurate, and the probability of insufficient preheating or excessive preheating of the thermal infrared imager 1 is further reduced.

Referring to fig. 4, the gas needle 3 is provided in a stepped shaft shape, and a small diameter end of the gas needle 3 is fitted into the preheating hole 12. The preheating hole 12 is connected with a wedge block 61 in a sliding manner along the radial direction of the preheating hole 12, and the inclined surface of the wedge block 61 is far away from the thermal infrared imager 1. The outer periphery of the small-diameter end of the air needle 3 is provided with two clamping grooves 32, and the two clamping grooves 32 are symmetrically arranged on two sides of the air needle 3. The number of the wedge blocks 61 is two, and the wedge blocks 61 are arranged in one-to-one correspondence with the engaging grooves 32. The preheating hole 12 is communicated with a locking groove 62 connected with the wedge block 61 in a sliding way, and the locking groove 62 penetrates through the side wall of the preheating column 11. A sealing ring 121 is fixedly arranged on the inner wall of the preheating hole 12, and the sealing ring 121 is made of elastic rubber and is in interference fit with the small-diameter end of the air needle 3. The sealing ring 121 effectively prevents hot air from escaping from the gap between the air needle 3 and the preheating hole 12, and the utilization rate of the hot air is high.

Referring to fig. 4, a locking spring 63 is arranged in the locking groove 62, one end of the locking spring 63 is fixed to the end of the wedge block 61 away from the other end, the other end of the locking spring 63 is fixed in the locking groove 62 in an erected manner, and the elastic force of the locking spring 63 drives the two wedge blocks 61 to slide relatively. The preheating column 11 is sleeved with a locking ring 64, and the locking ring 64 is rotatably connected with the preheating column 11. The locking ring 64 is provided with a drawing groove 641 communicating with the locking groove 62 on the inner periphery thereof, and two drawing ropes 65 are provided in the drawing groove 641. One end of the pulling rope 65 is fixed to the inner bottom surface of the pulling groove 641, the other end of the pulling rope 65 is fixed to the end of the wedge block 61 away from the wedge block, and the two pulling ropes 65 are symmetrically arranged on the pulling groove 641 with respect to the fixing point of the pulling groove 641.

When the user inserts the gas needle 3 into the preheating hole 12, the wedge block 61 is automatically fitted into the engagement groove 32 by the elastic force of the locking spring 63, and the gas needle 3 is automatically fixed to the preheating hole 12 by abutting and limiting. When the user needs to extract the air needle 3, the locking ring 64 is rotated, the pulling rope 65 is pulled and displaced due to the rotation of the locking ring 64, the length of the part, located in the locking groove 62, of the pulling rope 65 is shortened, the two wedge-shaped blocks 61 slide away from each other under the pulling of the pulling rope 65, the locking state of the air needle 3 and the preheating hole 12 is released, and the user can extract the air needle 3. The air needle 3 is convenient to disassemble and install and convenient to use.

Referring to fig. 4, a touch switch 31 is fixed on the stepped surface of the air needle 3, and the touch switch 31 is electrically connected with the controller of the electromagnet 44. Under normal state, the electromagnet 44 is not electrified and the output end of the gas needle 3 is closed, when the gas needle 3 is inserted into the preheating hole 12, the touch switch 31 sends a signal to the controller of the electromagnet 44 due to the contact between the step surface of the gas needle 3 and the preheating column 11, the electrified state of the electromagnet 44 is changed, and the closing block 42 horizontally slides to the output end of the gas needle 3 to be communicated with the hot gas source mechanism 5. When the air needle 3 is idle, the closed output end of the air needle 3 blocks the entering of external dust and sundries, and the air needle 3 is not easy to block; when the air needle 3 is inserted for use, the communication state of the air needle 3 is automatically changed, and the use is more convenient.

Referring to fig. 5, in order to prevent foreign matters such as dust from entering the thermal infrared imager 1 when the air needle 3 is idle and the preheating hole 12 is open, the detection device further includes four stepped rubber stoppers 7. The outer diameter of the small-diameter end of the rubber plug 7 is equal to the inner diameter of the preheating hole 12, and the rubber plug 7 and the preheating hole 12 are in interference fit when being embedded. The user can plug the preheating hole 12 through the rubber plug 7, the rubber plug 7 is convenient to disassemble and assemble, and the preheating hole 12 is convenient to plug.

Referring to fig. 6, the hot air source mechanism 5 includes a hot air box 51 and a heating rod 52 fixed in the hot air box 51, a driving fan 53 is fixed on the hot air box 51, and the preheating controller 2 is electrically connected to both the heating rod 52 and the driving fan 53. The hot air box 51 is connected with the air needles 3 in parallel through hoses, a connecting support 54 is detachably and fixedly arranged on the hot air box 51, and one end, far away from the hot air box 51, of the connecting support 54 is detachably and fixedly arranged with the thermal infrared imager 1. The user generates an air flow by driving the fan 53, and the air flow is heated by the heating rod 52 while passing through the heating rod 52, so that the hot air box 51 can deliver hot air flow to the plurality of air pins 3. The preheating controller 2 can control whether the heating rod 52 and the driving fan 53 work or not, thereby realizing the control whether the hot air flow is manufactured and conveyed or not, and being convenient for a user to preheat.

The implementation principle of the embodiment is as follows: the user passes through the temperature in wireless temperature sensor 14 real-time detection thermal infrared imager 1, and judge the preheating progress of thermal infrared imager 1 through temperature data, preheat controller 2 and wireless temperature sensor 14 through wireless connection and realize preheating the automatic judgement of accomplishing the time point, sliding structure through closing block 42, electro-magnet 44, metal suction sheet 45 and closing spring 43 realize the control of air cock output end encapsulated situation, realize the control of hot gas flow production through heating rod 52 and driving fan 53, realize through preheating controller 2 that preheat the production and the pouring of automatic stop hot gas flow after accomplishing the time judgement completion, preheat process automatic control, the precision of preheating degree is high, high durability and convenient use.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. Switch board detection device, including thermal infrared imager (1) and preheating hole (12) of setting on thermal infrared imager (1), its characterized in that: still include detachable gas needle (3) of inserting on preheating hole (12), be provided with on gas needle (3) and be used for controlling closing mechanism (4) of gas needle (3) output end closed state, gas needle (3) have hot gas source mechanism (5) that are used for producing the hot gas flow through the hose connection, still including preheating controller (2) that are used for controlling closing mechanism (4) and hot gas source mechanism (5) work, thermal infrared imager (1) internal stability is equipped with and is used for providing wireless temperature sensor (14) of temperature data for preheating controller (2), miniature relief valve (13) have set firmly on thermal infrared imager (1).

2. The power distribution cabinet detection device according to claim 1, wherein: the number of the wireless temperature sensors (14) is not less than two, and the wireless temperature sensors (14) are dispersedly arranged in the thermal infrared imager (1).

3. The power distribution cabinet detection device according to claim 1, wherein: the sealing mechanism (4) comprises a sealing box (41) fixedly arranged at the end part of the air needle (3) far away from the preheating hole (12) and positioned outside the thermal infrared imager (1), an air passage (411) communicated with the air needle (3) and the hot air source mechanism (5) is arranged in the sealing box (41), a sealing block (42) is connected in the sealing box (41) in a sliding way along the direction vertical to the axial direction of the air channel (411), the air passage (411) is communicated with a closed passage (412) connected with the closed block (42) in a sliding way, a closed spring (43) for driving the closed block (42) to slide towards the air channel (411) is fixedly arranged in the closed channel (412), an electromagnet (44) is fixedly arranged in the closed channel (412), and a metal suction sheet (45) is fixedly arranged at the end part, far away from the air channel (411), of the closed block (42) corresponding to the electromagnet (44).

4. The power distribution cabinet detection device according to claim 3, wherein: the gas needle (3) is the step shaft form and sets up, it is connected with wedge (61) to radially slide along preheating hole (12) in preheating hole (12), the quantity of wedge (61) is two and the symmetry sets up on preheating hole (12) is interior, the symmetry is provided with block groove (32) with wedge (61) block on gas needle (3), preheat hole (12) intercommunication and slide locking groove (62) of being connected with wedge (61), locking spring (63) that drive wedge (61) slided relatively have set firmly in locking groove (62), preheat post (11) have set firmly on thermal infrared imager (1), preheat hole (12) and locking groove (62) all set up on preheating post (11), locking ring (64) have been registrated on preheating post (11), locking ring (64) and preheating post (11) swivelling joint, locking ring (64) interior week is provided with pull groove (641) that communicate with locking groove (62), two hauling ropes (65) are arranged in the hauling groove (641) corresponding to the two wedge blocks (61), one end of each hauling rope (65) is fixed to the inner bottom surface of the hauling groove (641), and the other end of each hauling rope (65) is fixed to each wedge block (61).

5. The power distribution cabinet detection device according to claim 4, wherein: touch switch (31) have set firmly on the ladder face of gas needle (3), touch switch (31) are connected with the controller electricity of electro-magnet (44).

6. The power distribution cabinet detection device according to claim 4, wherein: and a sealing ring (121) is fixedly arranged on the inner wall of the preheating hole (12), and the sealing ring (121) is in interference fit with the small-diameter end of the gas needle (3) when the gas needle (3) is fixedly arranged in the preheating hole (12).

7. The power distribution cabinet detection device according to claim 1, wherein: the rubber plug is characterized by further comprising a rubber plug (7) used for sealing the preheating hole (12), and the rubber plug (7) is in interference embedding with the preheating hole (12) when the preheating hole (12) is sealed.

8. The power distribution cabinet detection device according to claim 1, wherein: the hot air source mechanism (5) comprises a hot air box (51) and a heating rod (52) fixedly arranged in the hot air box (51), a driving fan (53) used for controlling the movement of hot air flow is fixedly arranged on the hot air box (51), and the hot air box (51) is connected with a plurality of air needles (3) in parallel.

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