A tunnel drying apparatus in a horn assembly line

Abstract

The application discloses a kind of tunnel drying equipment in loudspeaker assembly line, it is related to tunnel drying equipment technical field.The tunnel drying equipment includes bottom table, hot hair dryer, heating bin, bottom air supply device and multistage flow regulating device, the application is by the flow regulating shell inverted conical structure cooperation honeycomb grid rectification effect, make hot air flow effectively gather and stabilize before entering multistage air outlet disc, eliminate vortex and air flow turbulence, to obtain the flow consistent, speed uniformity of lower blowing air flow.Multistage air outlet disc is designed by decreasing partition type aperture and hole distance, so that hot air flow forms gradient distribution in ring direction, realizes the multistage drying effect of center strengthening, central balance, outer ring mitigation.The low-speed air curtain formed by outer ring can inhibit loudspeaker edge warping, avoid loudspeaker to produce deviation under the impact of high-temperature air flow, improve the stability of drying process.The air flow velocity of bottom is compensated by electric hair dryer device, so that the negative pressure area formed by bottom air outlet can improve the bottom heat exchange efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel drying equipment, in particular to a tunnel drying equipment in a horn assembly line. BACKGROUND

[0002] The tunnel drying equipment is widely used in electronic, automobile, household appliance, hardware and coating industries, and is used for heating, curing and drying the parts after spraying, cleaning or bonding treatment. In the assembly process of the vehicle-mounted horn, the horn unit needs to be dried at a set temperature and time after gluing, pot frame packaging or waterproof coating, so as to ensure that the glue layer is fully cured, the shell deformation is controllable, and the acoustic performance is stable. The tunnel drying equipment can complete directional heating and constant temperature treatment in a relatively independent thermal environment, and meet the requirements of the horn assembly line on drying uniformity, temperature consistency and production rhythm.

[0003] The existing tunnel drying equipment only uses conventional hot air blowing to dry the horn type curved workpiece, however, due to the curved structure of the workpiece, there is a difference in heating between the center and the edge of the workpiece, which easily leads to local over-drying or insufficient drying, and the edge of the workpiece is easily lifted and deviated under the blowing of excessive air volume, which affects the drying effect. At the same time, due to the vertical blowing arrangement, there is often a drying dead angle at the bottom of the horn. The existing device is also limited in air flow recovery and energy utilization rate, and it is difficult to adaptively adjust the air flow and temperature distribution according to the real-time working condition. SUMMARY

[0004] The present application aims to provide a tunnel drying equipment in a horn assembly line to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a tunnel drying equipment in a horn assembly line, comprising a bottom table, a heating bin is installed on the bottom table, a hot air blowing device is installed at the top end of the heating bin, a multi-stage flow adjusting device is installed at the bottom end of the hot air blowing device, and a bottom blowing air supplementing device is installed at the top end of the bottom table.

[0006] The bottom blowing air supplementing device comprises a bottom supporting cylinder, which is installed on the top plate of the bottom table, penetrates the top plate of the bottom table at the bottom end and is provided with an electric hair dryer, an outer ring cylinder is installed on the bottom supporting cylinder, the outer ring cylinder is concentrically arranged with the multi-stage flow adjusting device, and a flow collecting cavity is formed between the bottom supporting cylinder and the outer ring cylinder.

[0007] The tunnel drying equipment is connected with a control box, and the control box is provided with a control system for controlling the whole tunnel drying equipment.

[0008] Further, a bottom air outlet is arranged at the center of the bottom supporting cylinder, a plurality of supporting strips are arranged at the bottom end of the bottom supporting cylinder, the plurality of supporting strips form a supporting device, an inclined air outlet surface is arranged on the bottom supporting cylinder, a plurality of back blowing channels are arranged on the bottom supporting cylinder, and a filter ring is arranged on the bottom supporting cylinder.

[0009] The supporting device composed of the supporting strip is used for supporting the loudspeaker.

[0010] Further, a flexible expansion ring is installed in the outer ring cylinder, the flexible expansion ring is located in the flow collecting cavity, the outer ring cylinder is provided with an air inlet port, the air inlet port is connected with an air inlet device through a pipeline at one end, and the other end of the air inlet port is in communication with the inside of the flexible expansion ring.

[0011] The air inlet device is used for inputting or outputting gas into the flexible expansion ring through the air inlet port. The flexible expansion ring is made of elastic material.

[0012] The air inlet device is connected with the flexible expansion ring through the air inlet port, and inputs or outputs gas into the inside of the flexible expansion ring to change the volume state thereof. The flexible expansion ring is made of elastic material and can expand or contract under the action of controlled air pressure. When the flexible expansion ring expands, the volume of the flow collecting cavity correspondingly decreases, the airflow passage contracts, and the flow rate entering the blowback passage decreases, so that the heat dissipation load at the bottom of the loudspeaker can be reduced to avoid over-drying; when the flexible expansion ring contracts, the volume of the flow collecting cavity increases, and the corresponding blowback flow rate increases, so that the drying effect is improved. The control system feeds back through the temperature sensor, and synchronously adjusts the working states of the flexible expansion ring, the electric hair dryer device and the hot air blower device according to the real-time drying demand, so that multi-stage linkage control of the tunnel drying equipment in the loudspeaker assembly line is realized, and the drying efficiency is ensured.

[0013] Further, the multi-stage flow regulating device comprises a flow regulating shell, a honeycomb grid is arranged in the flow regulating shell, and a multi-stage air outlet disc is arranged at the bottom end of the flow regulating shell.

[0014] In operation, the control system starts the hot air blower device, the hot air blower device sprays hot air downward to form a high-temperature airflow, and the airflow first enters the inside of the flow regulating shell. The flow regulating shell adopts an inverted conical structure, so that the hot airflow with a wide upper part is gradually converged and uniformly gathered to the central area. The gathered airflow enters the honeycomb grid, the honeycomb grid is composed of a plurality of longitudinally and transversely interlaced grid plates, the grid structure of the honeycomb grid rectifies and separates the hot airflow, so that the turbulent airflow is redistributed and the vortex is weakened to form uniformly distributed airflow.

[0015] Further, the multi-stage air outlet disc is composed of an inner ring, a middle ring and an outer ring in sequence, a plurality of inner ring holes are arranged in the inner ring, a plurality of middle ring holes are arranged in the middle ring in sequence, and a plurality of outer ring holes are arranged in the outer ring. The diameters of the inner ring holes, the middle ring holes and the outer ring holes decrease in sequence, and the hole spacings of the inner ring holes, the middle ring holes and the outer ring holes decrease in sequence.

[0016] The airflow modified by the honeycomb grid continues to flow downward through the outer ring hole, the middle ring hole and the inner ring hole. Due to the partition structure of the multi-stage air outlet disc, the three ring hole diameters and the hole spacing are arranged in a decreasing manner, so that the airflow forms a gradient distribution; the inner ring hole has a larger hole diameter and a smaller hole spacing, and has the largest air volume, which is used to concentrate the blowing of the horn center area and to strengthen the water vapor evaporation of the center part; the middle ring hole has a moderate air volume, which is used to supplement the drying of the horn outer edge and the middle section; the outer ring hole has the smallest air volume, which drives the surrounding air to form a low-speed outer air curtain. The low-speed outer air curtain gradually weakens the airflow speed at the outer edge of the horn, thereby reducing the tendency of the horn edge to lift, preventing the horn from tilting, and improving the stability of the horn during drying.

[0017] Further, the flow regulating shell bottom is provided with a skirt, and the skirt surrounds the multi-stage air outlet disc, and a temperature sensor is arranged in the skirt.

[0018] The skirt arranged at the bottom of the flow regulating shell is used to constrain the flow direction of the downward airflow, so that the blown hot airflow is concentrated in the vertical direction, preventing the edge airflow from collapsing prematurely before reaching the horn. At the same time, the temperature sensor is embedded in the inside of the skirt to monitor the temperature of the airflow in real time, and the detected temperature signal is converted into an electric signal and transmitted to the control system to realize the effect of temperature control feedback.

[0019] When the drying temperature needs to be increased, the control system adjusts the air outlet temperature of the hot air blower device to accelerate the drying speed of the upper part of the horn. At the same time, the control system starts the electric blower device, and the electric blower device accelerates the airflow flowing from bottom to top at the bottom air outlet, so that a negative pressure area is formed at the bottom air outlet, promoting the airflow in the flow collecting cavity to be sucked in, and at the same time, the airflow velocity at the bottom of the horn is increased, thereby enhancing the heat exchange rate between the hot airflow and the bottom of the horn, and realizing the dynamic adjustment effect of the drying speed of the bottom of the horn.

[0020] Further, the reverse blowing channel inlet end is communicated with the flow collecting cavity, the reverse blowing channel outlet end penetrates through the inclined air outlet surface, the reverse blowing channel outlet end is upwardly raised, the reverse blowing channel inlet end is horizontally arranged, and the filter ring is arranged at the reverse blowing channel inlet end.

[0021] The filter ring is made of a water-absorbing material and is used to adsorb moisture in the airflow.

[0022] The airflow entering the flow collecting cavity is filtered and dehumidified by the filter ring arranged at the reverse blowing channel inlet end, and the filter ring is made of a water-absorbing material and can effectively adsorb moisture and condensed water. The dehumidified airflow is guided into the reverse blowing channel, and due to the upward structure of the reverse blowing channel, the airflow is sprayed along the inclined air outlet surface in the form of an inclined airflow to reversely blow the bottom of the horn, thereby eliminating the bottom drying dead zone and realizing the internal and external bidirectional heating drying. After the reverse blowing effect, the airflow is finally discharged from the bottom air outlet, completing a complete airflow heating cycle.

[0023] Further, the bottom support cylinder is provided with an inner expansion edge, and the outer ring cylinder is provided with an outer expansion edge, and the inner expansion edge and the outer expansion edge form a converging annular port, and the converging annular port is in communication with the collecting cavity in an up-down direction.

[0024] After the hot air flows downward through the horn, part of the air flow continues to flow downward and flows into the converging annular port through the bottom support cylinder.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] 1. By adjusting the inverted conical structure of the flow regulating shell and the rectifying effect of the honeycomb grid, the hot air flow is effectively gathered and stabilized before entering the multi-stage air outlet disc, and the vortex and air flow turbulence are eliminated, so that the downward blowing air flow with consistent flow direction and uniform speed is obtained.

[0027] 2. By setting a skirt on the bottom of the flow regulating shell, the downward air flow is kept concentrated in the vertical direction, the edge air flow is prevented from collapsing prematurely, and the stability of the hot flow is ensured.

[0028] 3. By setting the converging annular port composed of the inner expansion edge and the outer expansion edge, the converging channel can effectively guide the air flow below the horn to gather, improve the air flow recovery rate, and provide a stable air source basis for subsequent back blowing.

[0029] 4. By compensating the bottom air flow speed through the electric hair dryer device, the negative pressure area formed by the bottom air outlet can promote the heat exchange efficiency of the bottom, and improve the overall heat utilization rate and drying efficiency.

[0030] 5. By setting the flexible expansion ring that can expand and contract, the self-adaptive adjustment of the volume of the collecting cavity and the airflow flux is realized, and the reverse blowing airflow intensity can be automatically changed according to the drying demand. When the expansion ring expands, the bottom heat dissipation can be weakened to prevent over-drying; when the expansion ring contracts, the reverse blowing amount can be increased to strengthen the drying effect. Combined with the temperature sensor feedback signal, the control system realizes multi-stage linkage control, so that the device has precise temperature regulation capability, and the automation and stability of the drying process are improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a whole perspective view of the tunnel drying equipment of the application.

[0032] Figure 2 It is a perspective view of the tunnel drying equipment of the application.

[0033] Figure 3 It is a perspective view of the bottom blowing air supplementing device of the application. Figure 1

[0034] Figure 4 It is a perspective view of the multi-stage flow adjusting device of the application.

[0035] Figure 5 It is a perspective view of the bottom blowing air supplementing device of the application. Figure 2

[0036] Figure 6 It is a sectional view of the bottom blowing air supplementing device of the application.

[0037] Figure 7 It is a sectional view of the multi-stage flow adjusting device of the application.

[0038] Figure 8 It is a perspective view of the multi-stage air outlet disc of the application.

[0039] Figure 9 It is a partial enlarged view of the A area of the application. Figure 6

[0040] In the figure: 1, bottom table; 2, hot air blowing device; 3, heating bin; 4, bottom blowing air supplementing device; 5, multi-stage flow adjusting device; 41, bottom supporting cylinder; 42, outer ring cylinder; 43, electric hair dryer device; 44, flexible expansion ring; 45, filtering ring; 46, collecting cavity; 411, bottom air outlet; 412, supporting strip; 413, reverse blowing channel; 414, inner expansion edge; 415, oblique air outlet surface; 421, outer expansion edge; 422, air inlet port; 51, flow adjusting shell; 52, multi-stage air outlet disc; 53, honeycomb grid; 521, outer ring hole; 522, middle ring hole; 523, inner ring hole; 511, skirt edge. DETAILED DESCRIPTION

[0041] ​​​Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

[0042] As shown in Figures 1-9 The present application provides a technical scheme of a tunnel drying equipment in a loudspeaker assembly line: a bottom table 1 is provided, a heating bin 3 is installed on the bottom table 1, a hot air blower 2 is installed on the top of the heating bin 3, a multi-stage flow adjusting device 5 is installed at the bottom end of the hot air blower 2, and a bottom blowing air supplementing device 4 is installed at the top end of the bottom table 1.

[0043] The bottom blowing air supplementing device 4 comprises a bottom supporting cylinder 41, which is installed on the top plate of the bottom table 1, penetrates the top plate of the bottom table 1 at the bottom end, and is provided with an electric hair dryer 43, an outer ring cylinder 42 is installed on the bottom supporting cylinder 41, the outer ring cylinder 42 is concentrically arranged with the multi-stage flow adjusting device 5, and a flow collecting cavity 46 is formed between the bottom supporting cylinder 41 and the outer ring cylinder 42. The tunnel drying equipment is connected with a control box, and the control box is provided with a control system for controlling the entire tunnel drying equipment.

[0044] The multi-stage flow adjusting device 5 comprises a flow adjusting shell 51, the flow adjusting shell 51 is provided with a honeycomb grid 53, and the bottom end of the flow adjusting shell 51 is provided with a multi-stage air outlet disc 52.

[0045] The multi-stage air outlet disc 52 is composed of an inner ring, a middle ring and an outer ring in sequence, a plurality of inner ring holes 523 are arranged in the inner ring, a plurality of middle ring holes 522 are arranged in the middle ring in sequence, and a plurality of outer ring holes 521 are arranged in the outer ring, the diameters of the inner ring holes 523, the middle ring holes 522 and the outer ring holes 521 decrease in sequence, and the hole spacings of the inner ring holes 523, the middle ring holes 522 and the outer ring holes 521 decrease in sequence.

[0046] The bottom end of the flow adjusting shell 51 is provided with a skirt 511, the multi-stage air outlet disc 52 is surrounded by the skirt 511, and a temperature sensor is arranged in the skirt 511.

[0047] The inner expanding edge 414 is arranged on the bottom supporting cylinder 41, the outer expanding edge 421 is arranged on the outer ring cylinder 42, the inner expanding edge 414 and the outer expanding edge 421 form a tapered annular opening, and the tapered annular opening is in communication with the flow collecting cavity 46 in an up-down direction.

[0048] The bottom supporting cylinder 41 is provided with a bottom air outlet 411 at the center, a plurality of supporting strips 412 are arranged at the bottom end of the bottom supporting cylinder 41, the plurality of supporting strips 412 form a supporting device, an inclined air outlet surface 415 is arranged on the bottom supporting cylinder 41, a plurality of back blowing channels 413 are arranged on the bottom supporting cylinder 41, and a filter ring 45 is arranged on the bottom supporting cylinder 41. The supporting device formed by the supporting strips 412 is used for supporting the loudspeaker.

[0049] The inlet end of the back-blowing channel 413 is communicated with the collecting cavity 46, the outlet end of the back-blowing channel 413 penetrates the oblique air outlet surface 415, the outlet end of the back-blowing channel 413 is raised upward, the inlet end of the back-blowing channel 413 is horizontally arranged, and the filtering ring 45 is arranged at the inlet end of the back-blowing channel 413. The filtering ring 45 is made of water-absorbing material and is used for adsorbing moisture in the air flow.

[0050] The flexible expansion ring 44 is arranged in the collecting cavity 46, the outer ring barrel 42 is provided with an air inlet port 422, one end of the air inlet port 422 is connected with an air inlet device through a pipeline, and the other end of the air inlet port 422 is communicated with the inside of the flexible expansion ring 44.

[0051] The air inlet device is used for inputting or outputting gas into the flexible expansion ring 44 through the air inlet port 422. The flexible expansion ring 44 is made of elastic material.

[0052] The working principle of the present application is as follows: in operation, the control system starts the hot air blower 2, the hot air blower 2 sprays hot air downward to form a high-temperature air flow, the air flow first enters the inside of the flow-regulating shell 51. The flow-regulating shell 51 is in an inverted conical structure as a whole, so that the hot air flow at the upper part is gradually converged and uniformly gathered to the central area. The gathered air flow enters the honeycomb grid 53, the honeycomb grid 53 is composed of a plurality of longitudinally and transversely interlaced grid plates, the grid structure of the honeycomb grid 53 rectifies and separates the hot air flow, so that the turbulent air flow is redistributed and the vortex is weakened, and a uniformly distributed air flow is formed.

[0053] The air flow modified by the honeycomb grid 53 continues to flow downward through the outer ring hole 521, the middle ring hole 522 and the inner ring hole 523. Since the multi-stage air outlet disc 52 adopts a partitioned structure, the three ring hole diameters and hole spacings are arranged in a decreasing manner, so that the air flow is formed in a gradient distribution; the inner ring hole 523 has a larger hole diameter and a smaller hole spacing, and has the largest air outlet volume, which is used for concentrating blowing on the central area of the horn, and strengthening water vapor evaporation at the central part; the middle ring hole 522 has a moderate air outlet volume, which is used for supplementing and drying the outer edge and the middle section of the horn; and the outer ring hole 521 has the smallest air outlet volume, which drives the surrounding air to form a low-speed outer air curtain. The low-speed outer air curtain gradually weakens the air flow speed at the outer edge of the horn, thereby reducing the tendency of the horn edge to lift up, preventing the horn from tilting, and improving the stability of the horn in the drying process.

[0054] The skirt 511 arranged at the bottom of the flow-regulating shell 51 is used for restricting the flow direction of the downward air flow, so that the blown hot air flow is kept concentrated in the vertical direction, and the edge air flow is prevented from collapsing ahead of time before reaching the horn. At the same time, the temperature sensor is embedded in the inside of the skirt 511, the temperature of the air flow is monitored in real time, the detected temperature signal is converted into an electric signal and transmitted to the control system, and the effect of temperature control feedback is realized.

[0055] After the hot air flows through the horn from top to bottom, part of the air continues to flow downward and enters the converging annular port through the bottom support cylinder 41. The converging annular port is composed of the inner expanding edge 414 and the outer expanding edge 421, and the converging structure can effectively guide the air flow to gather and enter the collecting cavity 46.

[0056] The air flow entering the collecting cavity 46 is filtered and dehumidified through the filter ring 45 arranged at the inlet end of the back blowing channel 413. The filter ring 45 is made of water-absorbing material and can effectively absorb moisture and condensate. The dehumidified air flow is guided into the back blowing channel 413. Since the back blowing channel 413 adopts an upward structure, the air flow is sprayed along the inclined air outlet surface 415 and then reversely blows the bottom of the horn in the form of an inclined air flow, so as to eliminate the drying dead zone at the bottom and realize the internal and external bidirectional heating drying. After the back blowing effect, the air flow is finally discharged from the bottom air outlet 411, completing a complete air flow heating cycle.

[0057] When the drying temperature needs to be increased, the control system adjusts the air outlet temperature of the hot air blower 2 to accelerate the drying speed at the upper part of the horn. At the same time, the control system starts the electric blower 43, which accelerates the air flow flowing from bottom to top at the bottom air outlet 411, so that a negative pressure area is formed at the bottom air outlet 411, promoting the air flow in the collecting cavity 46 to be sucked in, and the flow rate of the air flow at the bottom of the horn is increased, thereby enhancing the heat exchange rate between the hot air flow and the bottom of the horn, and realizing the dynamic adjustment effect of the drying speed at the bottom of the horn.

[0058] The air inlet device is connected to the flexible expansion ring 44 through the air inlet port 422, and inputs or outputs gas to the inside to change the volume state. The flexible expansion ring 44 is made of elastic material and can expand or contract under the action of controlled air pressure. When the flexible expansion ring 44 expands, the volume of the collecting cavity 46 decreases, the air flow channel contracts, and the flow rate entering the back blowing channel 413 decreases, which can reduce the heat dissipation load at the bottom of the horn and avoid over-drying. When the flexible expansion ring 44 contracts, the volume of the collecting cavity 46 increases, and the corresponding back blowing flow rate increases, which improves the drying effect. The control system feedbacks through the temperature sensor and synchronously adjusts the working states of the flexible expansion ring 44, the electric blower 43 and the hot air blower 2 according to the real-time drying demand, so as to realize the multi-stage linkage control of the tunnel drying equipment in the horn assembly line and ensure the drying efficiency.

[0059] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims with respect to the figures of the patent document.

Claims

1. A tunnel drying device in a loudspeaker assembly line, comprising a base table (1) on which a heating bin (3) is installed, and a hot air blowing device (2) is installed at the top end of the heating bin (3), characterized in that: The hot air blower device (2) is provided with a multi-stage flow adjusting device (5) at the bottom end, and the bottom platform (1) is provided with a bottom blowing air supplementing device (4) at the top end; The bottom blowing air supplementing device (4) comprises a bottom supporting cylinder (41) which is installed on the top plate of the bottom platform (1), the bottom supporting cylinder (41) penetrates through the top plate of the bottom platform (1) and is provided with an electric hair drier device (43) at the bottom end, an outer ring cylinder (42) is installed on the bottom supporting cylinder (41), the outer ring cylinder (42) is concentrically arranged with the multi-stage flow adjusting device (5), and a flow collecting cavity (46) is formed between the bottom supporting cylinder (41) and the outer ring cylinder (42); A flexible expansion ring (44) is installed in the outer ring cylinder (42); The multi-stage flow adjusting device (5) comprises a flow adjusting shell (51), the flow adjusting shell (51) is provided with a honeycomb grid (53) therein, and the flow adjusting shell (51) is provided with a multi-stage air outlet disc (52) at the bottom end; The multi-stage air outlet disc (52) is composed of an inner ring, a middle ring and an outer ring in sequence, a plurality of inner ring holes (523) are arranged in the inner ring, a plurality of middle ring holes (522) are arranged in the middle ring in sequence, and a plurality of outer ring holes (521) are arranged in the outer ring; The flow adjusting shell (51) is provided with a skirt (511) at the bottom; An inner expansion edge (414) is arranged on the bottom supporting cylinder (41), an outer expansion edge (421) is arranged on the outer ring cylinder (42), and the inner expansion edge (414) and the outer expansion edge (421) form a gradually converging annular opening.

2. A tunnel drying apparatus for a speaker assembly line according to claim 1, wherein: A bottom air outlet (411) is arranged at the center of the bottom supporting cylinder (41), a plurality of supporting strips (412) are arranged at the bottom end of the bottom supporting cylinder (41) and form a supporting device, an oblique air outlet surface (415) is arranged on the bottom supporting cylinder (41), a plurality of back blowing channels (413) are arranged on the bottom supporting cylinder (41), and a filter ring (45) is arranged on the bottom supporting cylinder (41).

3. The in-line tunnel drying apparatus for a speaker assembly line according to claim 1, wherein: The flexible expansion ring (44) is located in the flow collecting cavity (46), the outer ring cylinder (42) is provided with an air inlet port (422), one end of the air inlet port (422) is connected with an air inlet device through a pipeline, and the other end of the air inlet port (422) is in communication with the inside of the flexible expansion ring (44).

4. The in-line tunnel drying apparatus for a speaker assembly line according to claim 1, wherein: The diameters of the inner ring holes (523), the middle ring holes (522) and the outer ring holes (521) gradually decrease in sequence, and the hole spacing of the inner ring holes (523), the middle ring holes (522) and the outer ring holes (521) gradually decreases in sequence.

5. A tunnel drying apparatus for a speaker assembly line according to claim 4, wherein: The skirt (511) surrounds the multi-stage air outlet disc (52), and a temperature sensor is arranged in the skirt (511).

6. A tunnel drying apparatus for a speaker assembly line according to claim 2, wherein: The inlet end of the back blowing channel (413) is in communication with the flow collecting cavity (46), the outlet end of the back blowing channel (413) penetrates through the oblique air outlet surface (415), the outlet end of the back blowing channel (413) is upwardly raised, the inlet end of the back blowing channel (413) is horizontally arranged, and the filter ring (45) is arranged at the inlet end of the back blowing channel (413).

7. A tunnel drying apparatus for a speaker assembly line according to claim 1, wherein: The gradually converging annular opening is in communication with the flow collecting cavity (46) upwardly and downwardly.

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