CN109967384A - A sealing inspection device for automatic assembly line of throttle valve - Google Patents

Abstract

The invention relates to the technical field of automatic throttle valve assembly equipment, in particular to a sealing inspection device for an automatic throttle valve assembly production line, comprising a controller, a valve body unloading mechanism, a gas injection and pressure maintaining mechanism, and a gas hole plug. , The relative movement mechanism of the plug and the detection table, the gas injection and pressure keeping mechanism is arranged above the detection table, the working end of the relative movement mechanism of the plug extends upward to the top of the detection table and is located on both sides of the detection table, and the air hole plug is fixed. It is installed on the working end of the opposite movement mechanism of the plug. The air hole plug is attached to the side of the valve body with air holes. The air injection and pressure maintaining mechanism includes an air injection rod and a twenty-second linear drive device. The air injection rod is fixedly installed in the The working end of the twenty-second linear drive device and the output direction of the twenty-second linear drive device are set vertically downward. This device can detect whether the assembled throttle valve has good air tightness, and separate qualified and unacceptable ones. Qualified throttle valve.

Description

A sealing inspection device for automatic assembly line of throttle valve

technical field

The invention relates to the technical field of automatic assembling equipment for throttle valves, in particular, to a device for checking the tightness of a throttle valve automatic assembling production line.

Background technique

The throttle valve is a valve that controls the fluid flow by changing the throttle section or the throttle length. The throttle valve and the one-way valve can be combined in parallel to form a one-way throttle valve. The throttle valve and the one-way throttle valve are simple and easy to use. flow control valve.

It is more difficult to adjust the speed of pneumatic actuators with pneumatic flow control valves than with hydraulic flow control valves because of the compressibility of gas. Therefore, the following points should be paid attention to when adjusting the speed of the pneumatic flow control valve to prevent crawling:

1. There should be no air leakage on the pipeline;

2. The lubrication state between the cylinder and the piston is better;

3. The flow control valve should be installed around the cylinder or air motor as much as possible;

4. The outlet throttling speed regulation method should be adopted as much as possible;

5. The applied load should be stable. If the external load changes greatly, hydraulic or mechanical devices (such as gas-liquid linkage) should be used to compensate for the speed change caused by the load change.

At present, the throttle valve assembly machine in use has complicated procedures, inconvenient operation, unreasonable design in detail, and damage to the product during the assembly process, which wastes both manpower and material resources, which is not conducive to popularization and use.

Chinese patent CN204868077U discloses an automatic throttle valve assembly machine, including a frame, on which a conveyor belt is arranged, and a manual discharge mechanism, a feeding mechanism 1, a refueling mechanism, and an upper feeding mechanism are arranged on the conveyor belt in sequence. Feeding mechanism 2, press-in mechanism, zinc sleeve assembly mechanism, button assembly mechanism, detection mechanism, blanking mechanism and touch screen.

The device disclosed in this patent is only suitable for a simple throttle valve composed of a valve sleeve, a valve body, a zinc sleeve, etc., and is not suitable for a complex throttle valve in the prior art.

The throttle valve in the prior art includes a valve body, a valve stem and a valve core, wherein the valve body is sleeved with two sealing rings, the valve stem is sleeved with a sealing ring, and the valve core is also sleeved with a sealing ring. A lock nut is installed at the bottom end of the valve stem, and an adjusting screw is installed at the bottom end of the valve body. After the valve stem and the valve core are installed inside the valve body, the valve body lock must be riveted, and finally the air tightness inspection is carried out. .

For the complicated throttle valve in the prior art, an automatic assembly production line is required for automatic assembly production.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the present invention provides a device for checking the tightness of a throttle valve automatic assembly production line. The device can detect whether the assembled throttle valve has good air tightness, and separate qualified and unqualified throttles. flow valve.

The invention discloses a sealing inspection device for an automatic assembly production line of a throttle valve, comprising a controller, a valve body unloading mechanism, a gas injection and pressure maintaining mechanism, an air hole plug, a plug relative moving mechanism and a detection table, a valve body The unloading mechanism, the gas injection and pressure maintaining mechanism and the plug relative moving mechanism are all electrically connected to the controller. The gas injection and pressure maintaining mechanism is arranged above the detection table, and the plug relative movement mechanism is fixedly installed under the detection table through a bracket. The working end of the head-to-movement mechanism extends upward to the top of the test table and is located on both sides of the test table. The air hole plug is fixedly installed on the working end of the plug-to-move mechanism, and the air hole plug is attached to the side of the valve body with air holes. The gas injection and pressure maintaining mechanism includes a gas injection rod and a twenty-second linear drive device. The gas injection rod is fixedly installed on the working end of the twenty-second linear drive device, and the output direction of the twenty-second linear drive device is vertical. Set down.

Preferably, the gas injection and pressure maintaining mechanism further includes a gas pressure sensor, the gas pressure sensor is installed inside the gas injection rod, and the gas pressure sensor is electrically connected to the controller.

Preferably, the air hole plug is in the shape of a square made of elastic material, and the side of the air hole plug facing the valve body is provided with a semicircular hole that closely fits with the circumferential surface of the valve body.

Preferably, the top end of the air hole plug is installed with a fixing piece extending in a direction away from the valve body, the fixing piece is in the shape of a horizontally arranged flat plate, and two mounting holes vertically penetrating the fixing piece are arranged on the fixing piece; It includes an open-finger cylinder and a clamping claw installed on the working end of the open-finger cylinder. The working end of the clamping claw is provided with a square groove for clearance fit with the air hole plug and a threaded hole corresponding to the two installation holes one-to-one.

Preferably, the inner diameter of the gas injection rod is larger than the outer diameter of the top ring of the valve body, and a sealing ring is installed at the bottom end of the gas injection rod, and the inner diameter of the sealing ring is smaller than the inner diameter of the top ring of the valve body.

Preferably, the valve body unloading mechanism includes a manipulator, a belt conveyor, a code tray and a waste bucket, and the code tray is placed on the conveyor belt of the belt conveyor.

Preferably, the pallet is covered with blind holes for loading the valve body.

Preferably, the manipulator includes a fourth sliding table, a twenty-third linear drive device, a finger cylinder and a valve body gripper, and the fourth sliding table rides between the inspection table and the belt conveyor through a bracket, and the twenty-third The linear drive device is fixedly installed on the working end of the fourth sliding table, the output direction of the twenty-third linear drive device is set vertically downward, the finger cylinder is fixedly installed on the working end of the twenty-third linear drive device, and the valve body clamps Fixed installation on the working end of the finger cylinder.

Preferably, the valve body unloading mechanism further includes a fourth sensor fixedly installed on the side of the fixed end of the twenty-third linear drive device, the working direction of the fourth sensor is vertically downward, and both the manipulator and the fourth sensor are connected to the control electrical connection.

Beneficial effects:

The twenty-second linear driving device drives the gas injection rod to move downward so that the gas injection rod cover is located at the top of the valve body, and at the same time, the plug relative moving mechanism drives the air hole plug to move in the direction of the valve body, so that the air hole plug is removed from the valve body. The valve body is stuck on both sides and the part of the valve body with the air hole is blocked, and then the air compressor injects gas into the valve body through the air injection rod and maintains the pressure for a period of time;

The gas pressure sensor detects the air pressure. If the air pressure is lower than the standard value, it will send a signal to the controller, and the controller will send a signal to the valve body unloading mechanism, and the unloading manipulator will put the valve body into the waste bin; , the controller sends a signal to the valve body unloading mechanism, and the unloading manipulator places the throttle valve on the pallet.

1. The device can detect whether the assembled throttle valve has good air tightness;

2. The device can separate qualified and unqualified throttle valves.

Description of drawings

The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the attached image:

1 is a perspective view of an embodiment;

Figure 2 is a top view of the embodiment;

3 is a perspective view 1 of the workbench and the valve body material moving mechanism of the embodiment;

FIG. 4 is a perspective view 2 of the workbench and the valve body moving mechanism of the embodiment;

5 is a perspective view of the air tightness inspection mechanism of the embodiment;

6 is an exploded perspective view of the partial structure of the air tightness inspection mechanism of the embodiment;

Description of reference numbers:

Workbench 1, valve body feeding station 1a, valve body first sealing ring installation station 1b, valve body second sealing ring installation station 1c, valve stem installation station 1d, valve stem lubrication station 1e, first Transfer station 1f, lock nut installation station 1g, valve core installation station 1h, valve body lock riveting station 1j, second transfer station 1k, adjusting screw automatic dispensing installation station 1l, tightness detection Work station 1m, unloading station 1n, valve stem feeding station 1o, valve stem sealing ring installation station 1p, valve body moving mechanism 2, valve body feeding mechanism 2a, first mechanical claw moving mechanism 2b, vertical Straight movable plate 2b1, telescopic column 2b2, first linear drive device 2b3, horizontal sliding plate 2b4, first slide rail 2b5, second linear drive device 2b6, second mechanical claw moving mechanism 2c, mechanical gripper 2d, valve body Unloading mechanism 2e, unloading manipulator 2e1, fourth sliding table 2e11, twenty-third linear drive device 2e12, finger cylinder 2e13, valve body gripper 2e14, belt conveyor 2e2, code disc 2e3, waste bucket 2e4, The fourth sensor 2e5, the tightness inspection mechanism 10, the gas injection and pressure retention mechanism 10a, the gas injection rod 10a1, the twenty-second linear drive device 10a2, the air hole plug 10b, the semicircular hole 10b1, the fixing plate 10b2, the installation hole 10b3, the plug The head-to-movement mechanism 10c, the finger-opening cylinder 10c1, the clamping jaw 10c2, the square groove 10c3, the threaded hole 10c4, and the detection table 10d.

Detailed ways

Various embodiments of the present invention will be disclosed in the drawings below, and for the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the invention, these practical details are unnecessary. In addition, for the purpose of simplifying the drawings, some well-known structures and components will be shown in a simple schematic manner in the drawings.

In addition, descriptions such as “first”, “second”, etc. in the present invention are only for the purpose of description, and do not refer to the meaning of order or sequence, nor are they used to limit the present invention. The components or operations are described by the same technical terms, and should not be construed as indicating or implying their relative importance or implying the quantity of the indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection required by the present invention.

Referring to Figures 1 to 6, an automatic throttle valve assembly production line includes a workbench 1 and a valve body moving mechanism 2 fixedly installed on the workbench 1. The workbench 1 is provided with a One end to the other end of the table 1 is lined up in a straight line with thirteen stations, the thirteen stations are the valve body feeding station 1a, the valve body first sealing ring installation station 1b, the valve body second Sealing ring installation station 1c, valve stem installation station 1d, valve stem lubricating station 1e, first transfer station 1f, lock nut installation station 1g, valve core installation station 1h, valve body lock riveting station Position 1j, second transfer station 1k, adjustment screw automatic dispensing and installation station 1l, tightness detection station 1m, unloading station 1n, among which the valve stem installation station 1d is provided with a valve stem loading worker. Position 1o and stem seal installation position 1p;

Valve body feeding station 1a, valve body first sealing ring installation station 1b, valve body second sealing ring installation station 1c, lock nut installation station 1g, valve core installation station 1h, adjusting screw automatic dispensing The installation station 1l, the valve stem feeding station 1o, and the valve stem sealing ring installation station 1p are all provided with a feeding mechanism on the side, the valve body first sealing ring installation station 1b, and the valve body second sealing ring installation station. The valve body sealing ring installation mechanism 3 is arranged beside the position 1c, the valve stem feeding mechanism 4 is arranged beside the valve stem feeding station 1o, and the valve stem sealing ring installation mechanism is arranged beside the valve stem sealing ring installation station 1p. 5. A locking nut installation mechanism 6 is arranged beside the locking nut installation station 1g, a valve core installation mechanism 7 is arranged beside the valve core installation station 1h, and a valve is arranged beside the valve body lock riveting station 1j. The body lock riveting mechanism 8, the adjustment screw automatic dispensing and installation station 1l is provided with an adjustment screw automatic dispensing and installation mechanism 9, and the sealing detection station 1m is provided with a sealing inspection mechanism 10 beside it. There is also a controller, the controller and the valve body moving mechanism 2, the valve body sealing ring installation mechanism 3, the valve stem feeding mechanism 4, the valve stem sealing ring installation mechanism 5, the locking nut installation mechanism 6, the valve core installation mechanism 7. The valve body locking and riveting mechanism 8, the adjusting screw automatic dispensing and installation mechanism 9, the sealing inspection mechanism 10 and the feeding mechanism are all electrically connected;

The valve body moving mechanism 2 includes a valve body feeding mechanism 2a, a first mechanical claw moving mechanism 2b, a second mechanical claw moving mechanism 2c, a mechanical gripper 2d and a valve body unloading mechanism 2e. Each is provided with a mechanical gripper 2d, a plurality of mechanical grippers 2d are arranged in a straight line at equal intervals, the first mechanical gripper moving mechanism 2b is fixedly connected with the first six mechanical gripping jaws 2d, the second mechanical gripper The six mechanical jaws 2d are fixedly connected, the first mechanical jaw moving mechanism 2b and the second mechanical jaw moving mechanism 2c are of the same structure, the valve body feeding mechanism 2a is arranged beside the valve body feeding station 1a, and the valve body is unloaded. The mechanism 2e is arranged beside the unloading station 1n;

The first mechanical claw moving mechanism 2b includes a vertical movable plate 2b1, a telescopic column 2b2, a first linear driving device 2b3, a horizontal sliding plate 2b4, a first sliding rail 2b5 and a second linear driving device 2b6, the first sliding rail 2b5 The horizontal sliding plate 2b4 is fixedly installed on the working end of the first sliding rail 2b5, and the output end of the second linear driving device 2b6 is fixedly connected with the horizontal sliding plate 2b4. , the first linear drive device 2b3 is fixedly installed at the middle end of the horizontal sliding plate 2b4 and the output end of the first linear drive device 2b3 is vertically upward, the telescopic column 2b2 is fixedly installed at both ends of the horizontal sliding plate 2b4 and the telescopic column The telescopic direction of 2b2 is arranged vertically upward, the vertical movable plate 2b1 is arranged horizontally above the horizontal sliding plate 2b4, the middle end of the vertical movable plate 2b1 is fixedly connected with the working end of the first linear drive device 2b3, and the vertical movable plate Both ends of 2b1 are fixedly connected to the telescopic end of the telescopic column 2b2, and the mechanical gripper 2d is fixedly installed on the vertical movable plate 2b1.

The first linear drive device 2b3 and the second linear drive device 2b6 are both single-axis cylinders. The second linear drive device 2b6 drives the horizontal sliding plate 2b4 to reciprocate horizontally on the first slide rail 2b5. The first linear drive device 2b3 The vertical movable plate 2b1 is driven to reciprocate vertically, and the telescopic column 2b2 is a column installed with a guide column and a guide sleeve, wherein the guide column is fixedly connected to the bottom end of the vertical movable plate 2b1, so that the telescopic column 2b2 can support the vertical The weight of the movable plate 2b1 and the function of guiding the moving direction of the vertical movable plate 2b1;

The valve body feeding mechanism 2a includes a manipulator. During feeding, the feeding mechanism continuously moves the valve body to the side of the valve body feeding station 1a, and then grabs and places the valve body through the valve body feeding mechanism 2a. On the valve body feeding station 1a;

Subsequently, the mechanical gripper 2d clamps the valve body, and then the first linear drive device 2b3 drives the vertical movable plate 2b1 to move upward, so that the mechanical gripper 2d picks up the valve body to leave the working position and hangs; then the second The linear drive device 2b6 drives the horizontal sliding plate 2b4 to drive the vertical movable plate 2b1 to move sideways, so that the mechanical gripper 2d moves the valve body to the top of the next station, and then drives the vertical movement through the first linear drive device 2b3 The plate 2b1 moves down and releases the mechanical gripper 2d, and the valve body naturally falls to the position of the next station; The valve body moves to the next station at the same time;

The valve body moves through the valve body moving mechanism 2 under the control of the controller, and at the same time passes through the valve body sealing ring mounting mechanism 3, the valve stem feeding mechanism 4, the valve stem sealing ring mounting mechanism 5, the locking nut mounting mechanism 6, The valve core installation mechanism 7, the valve body locking and riveting mechanism 8 and the adjusting screw automatic dispensing and installation mechanism 9 are processed, and then the air tightness detection is carried out by the sealing inspection mechanism 10. After the detection is completed, the valve body moving mechanism 2 is moved. To the position of the unloading station 1n, the material is unloaded through the valve body unloading mechanism 2e.

The airtightness inspection device includes a gas injection and pressure maintaining mechanism 10a, a pore plug 10b, a plug relative moving mechanism 10c, and a detection table 10d. The bracket is fixedly installed below the test table 10d, the working end of the plug relative moving mechanism 10c extends upward to the top of the test table 10d and is located on both sides of the test table 10d, and the air hole plug 10b is fixedly installed on the plug relative moving mechanism 10c At the working end of the valve body, the air hole plug 10b is attached to the side of the valve body with the air hole. The air injection and pressure maintaining mechanism 10a includes an air injection rod 10a1 and a twenty-second linear drive device 10a2. The gas injection rod 10a1 is fixedly installed on the second The working ends of the twelve linear drive devices 10a2 and the output direction of the twenty-second linear drive device 10a2 are vertically downwardly arranged.

The gas injection and pressure maintaining mechanism 10a further includes an air compressor, the valve body is placed on the test table 10d, the twenty-second linear driving device 10a2 is a single-axis single-rod cylinder, and the twenty-second linear driving device 10a2 drives the gas injection rod 10a1 Moving downwards makes the gas injection rod 10a1 cover the top of the valve body, and at the same time, the plug relative moving mechanism 10c drives the air hole plug 10b to move toward the valve body, so that the air hole plug 10b clamps the valve body from both sides of the valve body and Block the part of the valve body with the air hole, and then the air compressor injects gas into the valve body through the air injection rod 10a1 and maintains the pressure for a period of time.

The gas injection and pressure maintaining mechanism 10a further includes a gas pressure sensor, the gas pressure sensor is installed inside the gas injection rod 10a1, and the gas pressure sensor is electrically connected to the controller.

When the gas is injected into the valve body and the pressure is maintained, the gas pressure sensor detects the air pressure. If the air pressure is lower than the standard value, a signal is sent to the controller, and the controller sends a signal to the valve body unloading mechanism 2e. The valve body unloading mechanism 2e releases the valve. put the body in the waste bin.

The air hole plug 10b is a square shape made of elastic material, and the side of the air hole plug 10b facing the valve body is provided with a semicircular hole 10b1 that closely fits with the circumferential surface of the valve body.

The plug relative moving mechanism 10c drives the air hole plug 10b to move toward each other, so that the air hole plug 10b clamps the valve body through the semicircular hole 10b1, and the inner wall of the semicircular hole 10b1 can connect the vent hole on the side of the valve body through the elastic structure of the air hole plug 10b. Block tightly.

The top end of the air hole plug 10b is installed with a fixing piece 10b2 extending in a direction away from the valve body. The fixing piece 10b2 is in the shape of a horizontally arranged flat plate. The head moving mechanism 10c includes an open finger cylinder 10c1 and a clamping jaw 10c2 installed on the working end of the open finger cylinder 10c1. The working end of the clamping jaw 10c2 is provided with a square groove 10c3 for clearance fit with the air hole plug 10b and two mounting holes 10b3. One-to-one corresponding threaded holes 10c4.

The fixing piece 10b2 is a rigid material, the air hole plug 10b and the fixing piece 10b2 are fixedly connected by glue, and the fixing piece 10b2 is fixedly installed on the threaded hole 10c4 through the mounting hole 10b3 by screws, so that the fixing piece 10b2 can be fixed in the square groove 10c3 , The detachable design of the air hole plug 10b makes it possible to replace it when the air tightness is not good after a long period of use.

The inner diameter of the gas injection rod 10a1 is larger than the outer diameter of the top ring of the valve body, and a sealing ring is installed at the bottom end of the gas injection rod 10a1, and the inner diameter of the sealing ring is smaller than the inner diameter of the top ring of the valve body.

When the gas injection rod 10a1 is sleeved on the ring at the top of the valve body, the gas injection rod 10a1 is connected with the top line of the valve body through the sealing ring, so as to ensure that the gas will not pass between the gas injection rod 10a1 and the valve body when the pressure is maintained in the valve body. The gap between them escapes.

working principle:

The valve body is placed on the testing table 10d, the twenty-second linear driving device 10a2 is a single-axis single-rod cylinder, and the twenty-second linear driving device 10a2 drives the gas injection rod 10a1 to move downward so that the gas injection rod 10a1 is covered on the valve body. At the same time, the plug relative moving mechanism 10c drives the air hole plug 10b to move towards the direction of the valve body, so that the air hole plug 10b clamps the valve body from both sides of the valve body and blocks the part of the valve body with the air hole, and then the air pressure The machine injects gas into the valve body through the gas injection rod 10a1 and maintains the pressure for a period of time;

When the gas is injected into the valve body and the pressure is maintained, the gas pressure sensor detects the air pressure. If the air pressure is lower than the standard value, a signal is sent to the controller, and the controller sends a signal to the valve body unloading mechanism 2e. The valve body unloading mechanism 2e releases the valve. put the body in the waste bin.

The above description is merely an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and variations of the present invention are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims (9)

1. A device for checking the tightness of a throttle valve automatic assembly production line, characterized in that it comprises a controller, a valve body unloading mechanism (2e), a gas injection and pressure maintaining mechanism (10a), a gas hole plug (10b), The plug relative moving mechanism (10c) and the detection table (10d), the valve body unloading mechanism (2e0), the gas injection and pressure maintaining mechanism (10a) and the plug relative moving mechanism (10c) are all electrically connected to the controller, and the gas injection The pressure maintaining mechanism (10a) is arranged above the detection table (10d), the plug relative moving mechanism (10c) is fixedly installed under the detection table (10d) through a bracket, and the working end of the plug relative moving mechanism (10c) extends upwards The air hole plug (10b) is fixedly installed on the working end of the plug relative moving mechanism (10c), and the air hole plug (10b) is connected to the valve body. The sides provided with air holes are fitted together, the air injection and pressure maintaining mechanism (10a) includes an air injection rod (10a1) and a twenty-second linear drive device (10a2), and the gas injection rod (10a1) is fixedly installed on the twenty-second linear At the working end of the driving device (10a2), the output direction of the twenty-second linear driving device (10a2) is arranged vertically downward. 2. The tightness inspection device of a throttle valve automatic assembly production line according to claim 1, characterized in that: the gas injection and pressure maintaining mechanism (10a) further comprises a gas pressure sensor, and the gas pressure sensor is installed on the gas injection rod Inside (10a1), the gas pressure sensor is electrically connected to the controller. 3. The device for checking the tightness of a throttle valve automatic assembly production line according to claim 1, wherein the air hole plug (10b) is a square shape made of elastic material, and the air hole plug (10b) faces the valve body One side of the valve body is provided with a semicircular hole (10b1) which is closely matched with the circumferential surface of the valve body. 4. The device for checking the tightness of a throttle valve automatic assembly production line according to claim 1, wherein the top end of the air hole plug (10b) is installed with a fixing plate (10b2) extending in a direction away from the valve body , the fixing piece (10b2) is in the shape of a horizontally arranged flat plate, and the fixing piece (10b2) is provided with two mounting holes (10b3) vertically penetrating the fixing piece (10b2); The cylinder (10c1) and the clamping jaw (10c2) installed on the working end of the open finger cylinder (10c1), the working end of the clamping jaw (10c2) is provided with a square groove (10c3) for clearance fit with the air hole plug (10b) and two The mounting holes (10b3) correspond to the threaded holes (10c4) one by one. 5. The device for checking the tightness of a throttle valve automatic assembly production line according to claim 1, wherein the inner diameter of the gas injection rod (10a1) is larger than the outer diameter of the top ring of the valve body, and the gas injection rod (10a1) ) is installed with a sealing ring, and the inner diameter of the sealing ring is smaller than the inner diameter of the ring at the top of the valve body. 6. The device for checking the tightness of a throttle valve automatic assembly production line according to claim 1, wherein the valve body unloading mechanism (2e) comprises a manipulator (2e1), a belt conveyor (2e2), A code tray (2e3) and a waste bucket (2e4), the code tray (2e3) is placed on the conveyor belt of the belt conveyor (2e2). 7. The device for checking the tightness of an automatic throttle valve assembly production line according to claim 6, characterized in that: the code disc (2e3) is fully covered with blind holes for loading the valve body. 8. The device for checking the tightness of an automatic throttle valve assembly production line according to claim 6, wherein the manipulator (2e1) comprises a fourth sliding table (2e11), a twenty-third linear drive device (2e12) ), the finger cylinder (2e13) and the valve body gripper (2e14), the fourth sliding table (2e11) rides between the inspection table (10d) and the belt conveyor (2e2) through the bracket, and the twenty-third linear drive The device (2e12) is fixedly installed on the working end of the fourth sliding table (2e11), the output direction of the twenty-third linear drive device (2e12) is set vertically downward, and the finger cylinder (2e13) is fixedly installed on the twenty-third linear The working end of the driving device (2e12) and the valve body gripper (2e14) are fixedly installed on the working end of the finger cylinder (2e13). 9. A device for checking the tightness of a throttle valve automatic assembly production line according to claim 8, characterized in that: the valve body unloading mechanism (2e) further comprises a ) a fourth sensor (2e5) beside the fixed end, the working direction of the fourth sensor (2e5) is arranged vertically downward, and both the manipulator (2e1) and the fourth sensor (2e5) are electrically connected to the controller.