Air tightness detection device for plate type throttle valve production

Abstract

The invention relates to the technical field of industrial production, and particularly discloses an air tightness detection device for plate type throttle valve production, which is characterized by comprising a supporting seat, and a hollow chip removal box is fixed on the supporting seat; a lifting platform is fixed to the center of the upper portion of the chip removal box, and two sealing detection assemblies slidably connected with the upper portion of the chip removal box are arranged on the two sides of the lifting platform. The sealing detection assembly comprises a detection seat, and the interior of the detection seat is rotatably connected with a detection channel matched with the diameter of an inlet and an outlet of a valve. A sealing assembly used for sealing the detection channel is arranged at the end, away from the lifting platform, of the detection channel. The sealing assembly comprises sealing seats which are located on the two sides of the chip removal box correspondingly and are in sliding connection with the supporting seat. The device is used for solving the problem of false sealing of an existing detection device in the detection process due to machining scraps.

Description

Technical Field

[0001] This invention relates to the field of industrial production technology, and in particular to an airtightness testing device for the production of plate throttle valves. Background Technology

[0002] In industrial production, plate-type throttle valves, as a key fluid control component, are widely used in various hydraulic systems, pneumatic systems, and automated equipment. Their performance directly affects the stability and reliability of the entire system. Air tightness is a crucial performance indicator for plate-type throttle valves. Air tightness issues can lead to unstable system pressure, inaccurate flow control, and even serious consequences such as equipment failure and safety accidents. Therefore, rigorous and precise air tightness testing during the production of plate-type throttle valves is a critical step in ensuring product quality.

[0003] Traditional methods for testing the airtightness of plate-type throttle valves have several limitations. Firstly, some methods rely on manual operation, depending on the operator's experience and skill level. This not only results in low efficiency but also makes it difficult to guarantee the accuracy and consistency of the results, easily leading to missed or false detections. Secondly, while some automated testing devices improve efficiency to some extent, residual machining debris on the throttle valve surface and debris generated during the sealing process can easily accumulate at the sealing area. This results in a false seal, making it difficult to form a completely sealed testing chamber. Consequently, gas leakage occurs during the testing process, affecting accuracy, interfering with results, and potentially causing secondary damage to the throttle valve.

[0004] In addition, existing testing devices also have shortcomings in terms of structural design and functional integration, making it difficult to achieve comprehensive and dynamic airtightness testing of throttle valves, and failing to meet the needs of modern industrial production for high-quality and high-efficiency testing.

[0005] Therefore, a gas tightness testing device for plate-type throttle valve production is proposed to solve the problem of false sealing caused by processing waste in existing testing devices during the testing process. Summary of the Invention

[0006] The purpose of this invention is to provide an airtightness testing device for the production of plate throttle valves, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An airtightness testing device for the production of plate-type throttle valves, characterized in that it includes a support base on which a hollow chip box is fixed; A lifting platform is fixed at the center above the chip discharge box, and two sealing detection components are slidably connected to the top of the chip discharge box on both sides of the lifting platform. The sealing detection assembly includes a detection seat, and a detection channel adapted to the diameter of the valve inlet and outlet is rotatably connected inside the detection seat; the end of the detection channel away from the lifting platform is provided with a sealing assembly for sealing the detection channel; The sealing assembly includes sealing seats located on both sides of the chip box and slidably connected to the support base. A sealing channel is provided in the sealing seat on the side facing the lifting platform. A cylinder is fixed at the bottom of the sealing channel. A motor is fixed at the output end of the cylinder. A hollow sealing column is fixed at the output end of the motor. The sealing column is fixed with a plurality of friction protrusions and a plurality of through holes arranged in a spiral array on the end face away from the motor. The plurality of friction protrusions are arranged in multiple spirals along the circumferential direction of the sealing column end face. A through hole is evenly provided between two adjacent spirals of friction protrusions. The plurality of through holes are opened along the axial direction of the sealing column and communicate with the hollow cavity inside the sealing column. The sealing column is further provided with a spiral chip removal groove on the end face away from the motor. The chip removal groove is located between two adjacent turns of the friction protrusion and is consistent with the spiral direction of the friction protrusion. One end of the chip removal groove extends to the center of the end face of the sealing column, and the other end extends in a spiral direction and penetrates the outer wall of the sealing column, communicating with the outside of the sealing column.

[0008] Preferably, a honeycomb plate is fixed to the inner wall of the sealing column near the through hole, and a plurality of honeycomb holes are formed on the end face of the honeycomb plate, and the plurality of honeycomb holes communicate with the plurality of through holes.

[0009] Preferably, a negative pressure pump is provided inside the sealing column, and the negative pressure pump is connected to the through hole through the honeycomb plate.

[0010] Preferably, the outer diameter of the sealing column is adapted to the inner diameter of the detection channel.

[0011] Preferably, the inner wall of the hollow cavity inside the sealing column is provided with a discharge channel, and an electric switch for controlling its opening and closing is installed in the discharge channel. The inner wall of the sealing channel is provided with a second discharge channel, which connects the sealing channel and the vacuum chamber inside the sealing seat.

[0012] Preferably, the center of the sealing column is fixedly connected to one output end of the motor.

[0013] Preferably, the detection channel is annular, with a gear one fixed to its outer wall, the gear one meshing with a gear two, a motor shaft fixed to the center of the gear two, the motor shaft being connected to the output end of the motor two, and the motor two being fixed to the outer wall of the detection seat.

[0014] Preferably, the inner wall of the detection channel is provided with a plurality of mounting slots and a plurality of air intake holes along the length of the channel. The plurality of mounting slots and the plurality of air intake holes are symmetrically distributed based on the center of a circle, and an air tightness detection sensor is fixedly installed in each of the plurality of mounting slots.

[0015] Preferably, an annular air cavity is coaxially formed in the detection channel, the annular air cavity is connected to a plurality of the suction holes, an annular groove is formed on the outer wall of the annular air cavity along the circumference, the annular groove allows the annular air cavity to communicate with the external environment, and a sealing ring is rotatably connected in the annular groove, and an air hole is formed at the bottom of the sealing ring. An air pump is fixed to the bottom of the detection seat. One end of the air pump is fixed to the air hole, and the other end passes through the detection seat and communicates with the chip removal box. The top of the chip removal box is provided with a chip removal groove, which is located on the sliding path of the air hole. When the detection seat slides on the chip removal box, the chip removal groove is always in communication with the air hole.

[0016] Preferably, a second cylinder is provided on the side of the sealing assembly away from the sealing detection assembly, the fixed end of the second cylinder is fixed to the support base, and the output end of the second cylinder is fixed to the sealing base.

[0017] The beneficial effects of this invention are as follows: This invention designs a three-stage waste debris cleaning structure of "adsorption-guidance-collection". During the testing process, the negative pressure pump in the hollow cavity inside the sealing column generates negative pressure suction through the honeycomb holes on the honeycomb plate and the through holes on the end face of the sealing column, drawing the waste debris from the sealing surface into the sealing column. Simultaneously, the spiral friction protrusions and the second chip discharge groove on the end face of the sealing column scrape the waste debris into the chip discharge groove and guides it to the through holes, facilitating negative pressure adsorption. After a certain amount of waste debris is collected in the sealing column, the first discharge channel aligns with the second discharge channel by controlling the first motor, and the electric switch is turned on, guiding the waste debris into the vacuum chamber inside the sealing seat. Finally, the air pump draws the waste debris along with some gas from the vacuum chamber of the sealing seat through the air vent and transports it to the chip discharge box for centralized collection. This waste debris cleaning mechanism can effectively remove the waste debris generated during the testing process, avoiding interference with the sealing effect and test results, while protecting the throttle valve from secondary damage and extending its service life. This device employs a unique double-sealing structure. The first pre-sealing is achieved by the elastic sealing gasket inside the detection channel initially fitting against the inlet and outlet faces of the throttle valve. The second sealing is achieved by the tight fit between the sealing column and the detection channel, effectively forming a closed detection chamber. This prevents gas leakage during the detection process and provides a stable and reliable environment for airtightness testing, thereby greatly improving the accuracy of the test results and enabling precise detection of airtightness issues in the throttle valve. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present invention; Figure 3 This is a schematic diagram of the sealing column structure according to an embodiment of the present invention; Figure 4 This is an embodiment of the present invention. Figure 2 A magnified diagram of region A.

[0019] In the diagram: 1. Support base; 101. Chip box; 1011. Chip discharge groove one; 2. Sealing assembly; 201. Cylinder one; 202. Motor one; 203. Sealing column; 204. Friction protrusion; 205. Through hole; 206. Chip discharge groove two; 207. Honeycomb panel; 2071. Honeycomb hole; 208. Negative pressure pump; 209. Sealing seat; 2091. Sealing channel; 210. Discharge channel one; 211. Electric switch; 212. Discharge passage 3. Sealing detection assembly; 301. Detection seat; 302. Detection channel; 3021. Gear 1; 3022. Gear 2; 303. Mounting slot; 304. Air intake hole; 305. Air tightness detection sensor; 306. Annular air chamber; 307. Annular channel; 308. Sealing ring; 309. Air hole; 310. Air pump; 4. Lifting platform; 401. Shearing mechanism; 402. Placement platform; 5. Motor 2; 6. Cylinder 2. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Specifically, refer to Figures 1-4An airtightness testing device for the production of plate-type throttle valves includes a support base 1, on which a hollow chip discharge box 101 is fixed by bolts. The top of the chip discharge box 101 has a chip discharge port communicating with the interior. Two sealing components 2 are symmetrically arranged on both sides of the chip discharge box 101. Both sealing components 2 are slidably connected to the support base 1 through linear guide rails and can be translated in the direction of approaching or moving away from the chip discharge box 101. A lifting platform 4 is fixed to the center of the chip box 101 via a bracket. The lifting platform 4 includes a shearing mechanism 401 and a placement platform 402. One end of the shearing mechanism 401 is installed above the support base 1, and the other end of the shearing mechanism 401 is installed with the placement platform 402. The placement platform 402 is used to place the throttle valve to be tested. By activating the shearing mechanism 401, the placement platform 402 is raised and lowered, thereby raising the throttle valve to the required testing height.

[0022] Two sealing detection components 3 are symmetrically arranged on both sides of the lifting platform 4. Both sealing detection components 3 are slidably connected to the guide rail on the top of the chip box 101 via sliders. Each sealing detection component 3 includes a detection seat 301. A detection channel 302 adapted to the diameter of the valve inlet and outlet is rotatably connected inside the detection seat 301. An elastic sealing gasket is embedded in the inner side of the detection channel 302. A sealing component 2 for sealing the detection channel 302 is provided at the end of the detection channel 302 away from the lifting platform 4. The sealing assembly 2 includes a hollow sealing seat 209. A sealing channel 2091 is provided inside the sealing seat 209 on the side facing the lifting platform 4. The sealing channel 2091 is located above the hollow cavity inside the sealing seat 209. A cylinder 201 is fixed at the bottom of the sealing channel 2091. The output shaft of the cylinder 201 is arranged in a horizontal direction. A motor 202 is fixed at its output end through a flange. The output shaft of the motor 202 is coaxial with the output shaft of the cylinder 201. A hollow sealing column 203 is fixed at the output end of the motor 202 through a key connection. The sealing post 203 has a plurality of friction protrusions 204 and a plurality of through holes 205 arranged in a spiral array on the end face away from the motor 202. The friction protrusions 204 are made of wear-resistant rubber. Several friction protrusions 204 are arranged in a spiral pattern along the circumferential direction of the end face of the sealing column 203. A through hole 205 is uniformly provided between two adjacent circles of friction protrusions 204. Several through holes 205 are opened along the axial direction of the sealing column 203 and communicate with the hollow cavity inside the sealing column 203.

[0023] The sealing column 203 is further provided with a spiral chip removal groove 206 on the end face away from the motor 202. The chip removal groove 206 is located between two adjacent friction protrusions 204 and is consistent with the spiral direction of the friction protrusions 204. One end of the chip removal groove 206 extends to the center of the end face of the sealing column 203, and the other end extends in a spiral direction and penetrates the outer wall of the sealing column 203, communicating with the outside of the sealing column 203 to form a chip removal channel. In some preferred embodiments, a honeycomb plate 207 is fixed to the inner wall of the sealing post 203 near the through hole 205 by screws. A cavity is formed between the honeycomb plate 207 and the sealing post 203. The honeycomb plate 207 is made of stainless steel and has a plurality of honeycomb holes 2071 evenly opened on its end face.

[0024] In some preferred embodiments, a negative pressure pump 208 is fixed in the hollow cavity inside the sealing column 203. The suction port of the negative pressure pump 208 is connected to the side of the honeycomb plate 207 away from the through hole 205 through a pipe, so that the negative pressure pump 208 can generate negative pressure suction through the honeycomb holes 2071 on the honeycomb plate 207 and the through hole 205 on the end face of the sealing column 203.

[0025] In some preferred embodiments, the inner wall of the hollow cavity inside the sealing column 203 is provided with a discharge channel 210, and an electric switch 211 for controlling its opening and closing is installed in the discharge channel 210.

[0026] The inner wall of the sealing channel 2091 is provided with a discharge channel 212, which connects the sealing channel 2091 with the vacuum chamber inside the sealing seat 209.

[0027] By starting cylinder 201 and motor 202, the sealing column 203 rotates while moving, thereby connecting discharge channel 210 and discharge channel 212. At this time, the discharge channel 210 is opened by controlling the electric switch 211, so that the waste in the sealing column 203 enters the vacuum chamber inside the sealing seat 209 through discharge channel 210 and discharge channel 212.

[0028] In some preferred embodiments, the outer diameter of the sealing post 203 is adapted to the inner diameter of the detection channel 302, and can be inserted into the detection channel 302 to achieve a seal.

[0029] In some preferred embodiments, the depth of the chip removal groove 206 is 2-3 mm and the width is 3-5 mm.

[0030] In some preferred embodiments, the center of the sealing column 203 is fixedly connected to the output end of the motor 202.

[0031] In some preferred embodiments, the detection channel 302 is annular, and a gear 3021 is fixed on its outer wall. The gear 3021 meshes with a gear 3022. A motor shaft is fixed at the center of the gear 3022. The motor shaft is connected to the output end of the motor 5. The motor 5 is fixed on the outer wall of the detection seat 301.

[0032] In some preferred embodiments, the inner wall of the detection channel 302 is provided with a plurality of mounting grooves 303 and a plurality of suction holes 304 along the length of the channel. The plurality of mounting grooves 303 and the plurality of suction holes 304 are symmetrically distributed based on the center. An air tightness detection sensor 305 is fixedly installed in each of the plurality of mounting grooves 303 to check whether the valve leaks air during the rotation of the detection channel 302. An annular air chamber 306 is coaxially formed in the detection channel 302. The annular air chamber 306 communicates with a plurality of air intake holes 304. An annular groove 307 is formed circumferentially on the outer wall of the annular air chamber 306, which allows the annular air chamber 306 to communicate with the external environment. A sealing ring 308 is rotatably connected in the annular groove 307. An air hole 309 is formed at the bottom of the sealing ring 308. When the detection channel 302 is rotated, the detection channel 302 will rotate relative to the sealing ring 308.

[0033] An air pump 310 is fixed to the bottom of the detection seat 301. One end of the air pump 310 is fixed to the air hole 309, and the other end passes through the detection seat 301 and communicates with the chip box 101. The chip removal box 101 has a chip removal groove 1011 on its top. The chip removal groove 1011 is located on the sliding path of the air hole 309. When the detection seat 301 slides on the chip removal box 101, the chip removal groove 1011 is always in communication with the air hole 309.

[0034] In some preferred embodiments, a cylinder 6 is provided on the side of the sealing assembly 2 away from the sealing detection assembly 3. The fixed end of the cylinder 6 is fixed to the support base 1, and the output end of the cylinder 6 is fixed to the sealing base 209.

[0035] Working principle: Before testing, the device is in an initial standby state. Under the action of cylinder 6, the sealing components 2 on both sides are in an initial position away from the chip box 101. The placement platform 402 of the lifting platform 4 is in a low position, which is convenient for the operator to place the throttle valve to be tested. After the operator places the plate throttle valve to be tested smoothly on the placement platform 402, the shearing mechanism 401 of the lifting platform 4 is started. The shearing mechanism 401 drives the placement platform 402 to rise precisely until the inlet and outlet of the throttle valve are coaxially aligned with the detection channels 302 of the sealing detection components 3 on both sides, thus completing the height positioning of the workpiece and preparing for subsequent sealing docking.

[0036] After the workpiece is positioned, the two cylinders 6 on both sides start synchronously, pushing the corresponding sealing component 2 to move along the linear guide rail towards the chip box 101. At the same time, the two sealing detection components 3 on both sides slide synchronously towards each other along the guide rail at the top of the chip box 101 until the end of the detection channel 302 is in contact with the inlet and outlet of the throttle valve. At this time, the elastic sealing gasket on the inner side of the detection channel 302 is initially in contact with the inlet and outlet end faces of the throttle valve, achieving the first pre-sealing. At the same time, cylinder 201 in sealing assembly 2 is started, pushing motor 202 and sealing column 203 coaxially connected to it to move towards detection channel 302. Since the outer diameter of sealing column 203 is compatible with the inner diameter of detection channel 302, sealing column 203 is smoothly inserted into detection channel 302. The second seal is achieved through the cooperation of sealing column 203 and detection channel 302, and finally a closed detection chamber is formed.

[0037] After sealing is complete, the airtightness test officially begins: First, the negative pressure pump 208 blows air into the sealing column 203. The airflow inside the sealing column 203 is blown out through the honeycomb holes 2071 and the through holes 205. The motor 5 on the outer wall of the test seat 301 is started. The output shaft of the motor 5 drives the gear 3022 to rotate. The gear 3022 meshes with the gear 3021 on the outer wall of the test channel 302, thereby driving the test channel 302 to rotate at a constant speed inside the test seat 301. At the same time, the air pump 310 at the bottom of the test seat 301 starts, introducing gas at a stable pressure into the annular air chamber 306 of the test channel 302 through the air holes 309 in the sealing ring 308. The gas is distributed to each suction hole 304 through the annular air chamber 306, acting on the sealing contact surfaces between the throttle valve inlet / outlet and the test channel 302.

[0038] During the rotation of the detection channel 302, the airtightness detection sensor 305 in the mounting groove 303 on its inner wall rotates synchronously with the detection channel 302, performing comprehensive and dynamic airtightness detection at different circumferential positions of the sealing surface. If the throttle valve has a leakage defect, the leaked gas will be captured by the airtightness detection sensor 305, and the sensor will then send an alarm signal to the control system, indicating that the workpiece is unqualified; if the sensor does not detect gas leakage, the workpiece is determined to be airtight. During this process, the sealing ring 308 in the annular channel 307 remains fixed, and the detection channel 302 rotates relative to the sealing ring 308, ensuring that the annular air chamber 306 and the air hole 309 remain connected at all times, ensuring the stability of the air supply.

[0039] During the testing process, the contact and friction between the sealing column 203 and the testing channel 302, as well as the inlet and outlet of the throttle valve, may generate a small amount of debris. Simultaneously, residual processing debris on the surface of the throttle valve may also affect the sealing effect. The device achieves simultaneous cleaning through a three-stage debris cleaning structure of "adsorption-guidance-collection." 1. Adsorption and Collection: The negative pressure pump 208 inside the hollow cavity of the sealing column 203 is activated. The negative pressure pump 208 generates negative pressure from one side of the honeycomb plate 207 through the pipe. The negative pressure is transmitted through the honeycomb holes 2071 on the honeycomb plate 207 to the through hole 205 on the end face of the sealing column 203, forming a negative pressure suction force. The waste debris at the sealing surface is sucked into the hollow cavity inside the sealing column 203 through the through hole 205. At the same time, the sealing column 203 rotates synchronously under the drive of the motor 202. The spiral friction protrusions 204 on its end face not only enhance the sealing effect, but also scrape the waste debris into the chip discharge groove 206 between two adjacent rings of friction protrusions 204. The chip discharge groove 206 is in the same spiral direction as the friction protrusions 204. Under the action of rotation, the waste debris is guided to the outer wall of the sealing column 203 and finally adsorbed by the negative pressure through the through hole 205.

[0040] 2. Waste material discharge: After a certain amount of waste material is collected in the sealing column 203, the control system controls the motor 202 to drive the sealing column 203 to rotate, so that the discharge channel 210 on the inner wall of the sealing column 203 is aligned with the discharge channel 212 on the inner wall of the sealing channel 2091. Then, the electric switch 211 in the discharge channel 210 is turned on. Under the action of its own gravity and negative pressure residue, the waste material in the sealing column 203 enters the vacuum chamber inside the sealing seat 209 through the discharge channel 210 and the discharge channel 212, thus completing the flow of waste material from the sealing column 203 to the sealing seat 209.

[0041] 3. Centralized Collection: During operation, the air pump 310 not only supplies air for testing but also generates a certain suction effect through the air port 309, drawing in waste debris along with some gas from the vacuum chamber of the sealing seat 209 and transporting it to the chip discharge box 101 via pipeline. Since the chip discharge groove 1011 at the top of the chip discharge box 101 is located on the sliding path of the air port 309, and the chip discharge groove 1011 remains connected to the air port 309 during the sliding of the testing seat 301, it ensures that waste debris can stably enter the chip discharge box 101 for centralized collection. Simultaneously, other waste debris generated during the testing process also falls into the chip discharge box 101 through the chip discharge port, achieving unified collection of waste debris.

[0042] After the airtightness test is completed, the components are reset in reverse order: First, motor 25 stops working, and the test channel 302 stops rotating; air pump 310 and negative pressure pump 208 stop working, and electric switch 211 closes discharge channel 1 210; then, cylinder 1 201 retracts, driving the sealing column 203 out of the test channel 302; cylinder 2 6 retracts, pushing the sealing assembly 2 back to its initial position along the linear guide rail; the sealing test assembly 3 slides back to its reset position along the top guide rail of the chip box 101; finally, the shearing mechanism 401 retracts, driving the placement platform 402 down to its lowest position, and the operator removes the tested workpiece. Qualified workpieces proceed to the next production process, while unqualified workpieces undergo further processing. This completes one full airtightness test of the plate-type throttle valve.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An airtightness testing device for the production of plate-type throttle valves, characterized in that, Includes a support base (1), on which a hollow chip box (101) is fixed. A lifting platform (4) is fixed at the center above the chip box (101), and two sealing detection components (3) are provided on both sides of the lifting platform (4) and are slidably connected to the top of the chip box (101). The sealing detection assembly (3) includes a detection seat (301), and a detection channel (302) adapted to the diameter of the valve inlet and outlet is rotatably connected inside the detection seat (301); a sealing assembly (2) for sealing the detection channel is provided at one end of the detection channel (302) away from the lifting platform (4). The sealing assembly (2) includes sealing seats (209) located on both sides of the chip box (201) and slidably connected to the support base (1). A sealing channel (2091) is provided in the sealing seat (209) facing the lifting platform (4). A cylinder (201) is fixed at the bottom of the sealing channel (2091). A motor (202) is fixed at the output end of the cylinder (201). A hollow sealing column (203) is fixed at the output end of the motor (202). The sealing column (203) has a plurality of friction protrusions (204) and a plurality of through holes (205) arranged in a spiral array on the end face away from the motor (202). The friction protrusions (204) are arranged in multiple spirals along the circumferential direction of the end face of the sealing column (203). A through hole (205) is uniformly provided between two adjacent spirals of friction protrusions (204). The through holes (205) are all opened along the axial direction of the sealing column (203) and communicate with the hollow cavity inside the sealing column (203). The sealing column (203) is also provided with a spiral chip removal groove (206) on the end face away from the motor (202). The chip removal groove (206) is located between two adjacent friction protrusions (204) and is consistent with the spiral direction of the friction protrusions (204). One end of the chip removal groove (206) extends to the center of the end face of the sealing column (203), and the other end extends in a spiral direction and penetrates the outer wall of the sealing column (203), communicating with the outside of the sealing column (203).

2. The airtightness testing device for plate-type throttle valve production according to claim 1, characterized in that, A honeycomb plate (207) is fixed on the inner wall of the sealing column (203) near the through hole (205). A plurality of honeycomb holes (2071) are opened on the end face of the honeycomb plate (207), and the plurality of honeycomb holes (2071) are connected to the plurality of through holes (205).

3. The airtightness testing device for the production of plate-type throttle valves according to claim 2, characterized in that, The sealing column (203) is equipped with a negative pressure pump (208), which is connected to the through hole (205) through the honeycomb plate (207).

4. The airtightness testing device for plate-type throttle valve production according to claim 1, characterized in that, The outer diameter of the sealing column (203) is adapted to the inner diameter of the detection channel (301).

5. The airtightness testing device for plate-type throttle valve production according to claim 3, characterized in that, The inner wall of the hollow cavity inside the sealing column (203) is provided with a discharge channel (210), and an electric switch (211) for controlling its opening and closing is installed in the discharge channel (210). The inner wall of the sealing channel (2091) is provided with a discharge channel two (212), which connects the sealing channel (2091) and the vacuum chamber inside the sealing seat (209).

6. The airtightness testing device for plate-type throttle valve production according to claim 1, characterized in that, The center of the sealing column (203) is fixedly connected to the output end of motor one (202).

7. The airtightness testing device for plate-type throttle valve production according to claim 1, characterized in that, The detection channel (302) is annular, and a gear one (3021) is fixed on its outer wall. The gear one (3021) meshes with a gear two (3022). A motor shaft is fixed at the center of the gear two (3022). The motor shaft is connected to the output end of the motor two (5). The motor two (5) is fixed on the outer wall of the detection seat (301).

8. The airtightness testing device for plate-type throttle valve production according to claim 7, characterized in that, The inner wall of the detection channel (302) is provided with a plurality of mounting grooves (303) and a plurality of air intake holes (304) along the length of the channel. The plurality of mounting grooves (303) and the plurality of air intake holes (304) are symmetrically distributed based on the center of the circle. An air tightness detection sensor (305) is fixedly installed in each of the plurality of mounting grooves (303).

9. The airtightness testing device for the production of plate-type throttle valves according to claim 8, characterized in that, An annular air chamber (306) is coaxially formed in the detection channel (302). The annular air chamber (306) is connected to several of the suction holes (304). An annular groove (307) is formed along the circumferential direction on the outer wall of the annular air chamber (306). The annular groove (307) allows the annular air chamber (306) to communicate with the external environment. A sealing ring (308) is rotatably connected in the annular groove (307). An air hole (309) is formed at the bottom of the sealing ring (308). An air pump (310) is fixed at the bottom of the detection seat (301). One end of the air pump (310) is fixed to the air hole (309), and the other end passes through the detection seat (301) and communicates with the chip box (101). The chip removal box (101) has a chip removal groove (1011) on its top. The chip removal groove (1011) is located on the sliding path of the air hole (309). When the detection seat (301) slides on the chip removal box (101), the chip removal groove (1011) is always connected to the air hole (309).

10. The airtightness testing device for plate-type throttle valve production according to claim 1, characterized in that, A cylinder 2 (6) is provided on the side of the sealing assembly (2) away from the sealing detection assembly (3). The fixed end of the cylinder 2 (6) is fixed to the support seat (1), and the output end of the cylinder 2 (6) is fixed to the sealing seat (209).

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