Closed pipe detector and detection method for D-type collecting pipe in automobile heat exchanger

Abstract

The invention relates to the technical field of heat exchanger detection, and provides a closed pipe detector for a D-type collecting pipe in an automobile heat exchanger and a detection method. A transverse moving servo module, a first servo module, a second servo module, a third servo module and a fourth servo module are arranged above the fixing plate, and endoscope devices are arranged on the first servo module, the second servo module, the third servo module and the fourth servo module. And the first servo module, the second servo module, the third servo module and the fourth servo module drive the matched endoscope devices to move up and down towards the interior of the D-type collecting pipe of the workpiece to be detected. The states of the D-type collecting pipe opening are shot through the endoscope device, so that the states of the D-type collecting pipe opening are detected, and the NG rate of a product is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchanger detection, in particular to a closed pipe detector for D-shaped manifold in automobile heat exchanger and a detection method. BACKGROUND

[0002] With the continuous development of automobile radiators, the current radiator manifold is no longer sealed between the conventional injection molding and aluminum alloy (main plate), but enters a new process of integrated brazing of aluminum alloy manifold and core. In the old process, the operator can exclude more than 90% of the closed pipe problem by visual inspection after the B-shaped pipe is assembled with the main plate. The new process uses D-shaped manifold instead of main plate and water chamber, which cannot directly observe the state of the assembled core B-shaped pipe through visual observation. In order to reduce the NG rate of the product, a device for detecting the closed pipe of the D-shaped manifold before brazing is needed. SUMMARY

[0003] In order to solve the above technical problems, the present application provides a closed pipe detector for D-shaped manifold in automobile heat exchanger, which comprises a working box, a fixed plate is arranged obliquely in the working box, a horizontal movement servo module, a first servo module, a second servo module, a third servo module and a fourth servo module are arranged above the fixed plate, an endoscope device is arranged on each of the first servo module, the second servo module, the third servo module and the fourth servo module, the driving directions of the first servo module and the third servo module towards the pipe opening of the workpiece to be detected are oppositely arranged, the driving directions of the second servo module and the fourth servo module towards the pipe opening of the workpiece to be detected are oppositely arranged, the first servo module, the second servo module, the third servo module and the fourth servo module drive the endoscope devices matched therewith to move up and down in the D-shaped manifold of the workpiece to be detected, and the horizontal movement servo module is configured to drive the second servo module and the fourth servo module to move left and right with respect to the workpiece to be detected, so as to clamp or loosen the workpiece to be detected.

[0004] Further, the first servo module, the second servo module, the third servo module and the fourth servo module each comprise a first base, a first ball screw, a first sliding seat, a first light blocking piece, three first photoelectric switches, a first servo motor and a first linear guide rail, the first linear guide rail is arranged on the first base, the first servo motor is in power transmission with the first ball screw, the first sliding seat moves linearly along the first linear guide rail through the rotation of the first ball screw, the three first photoelectric switches are arranged on the side of the first base, and the first light blocking piece is arranged on the first sliding seat.

[0005] Further, the horizontal movement servo module comprises a second base, a second cover plate, a second ball screw, a second sliding seat, a second light barrier, a second photoelectric switch, a second servo motor and two second linear guides, the two second linear guides are locked on the left and right sides of the second base, the second servo motor is in power transmission with the second ball screw, the second sliding seat moves linearly along the second linear guide through the rotation of the second ball screw, the second photoelectric switch is arranged on the side of the second base, and the second light barrier is arranged on the second sliding seat; and the second cover plate covers the second base.

[0006] Further, the endoscope device comprises a detection probe, an endoscope body and a USB cable, the detection probe and the endoscope body are designed in an integrated manner, and the endoscope body is configured to convert original electric signals output by the detection probe into a USB standard data format; the detection probe comprises an optical lens, an illumination element (such as an LED) and an image sensor (for converting an optical signal into an electric signal), and is configured to collect images inside a pipe opening; the endoscope body is provided with an integrated signal processing circuit (for performing preliminary processing on sensor electric signals, such as noise reduction and encoding) and an interface circuit, and is fixed on the first sliding seat through fasteners; and the USB cable is configured to transmit images inside the pipe opening collected by the detection probe to an upper computer and provide power supply for the endoscope device.

[0007] Further, the fixed plate is further provided with a first connecting plate, a second connecting plate, a third connecting plate and a fourth connecting plate, and first, second, third and fourth guides; the third connecting plate is fixedly connected with the second connecting plate and the fourth connecting plate through a cushion block;

[0008] The first connecting plate is arranged on the first and fourth guides through first and second sliding blocks, the second connecting plate is arranged on the first and second guides through third and fourth sliding blocks, and the fourth connecting plate is arranged on the third and fourth guides through fifth and sixth sliding blocks;

[0009] The first connecting plate is provided with a first servo module and a third servo module at two ends thereof, the second connecting plate is provided with a second servo module, and the fourth connecting plate is provided with a fourth servo module; a first workpiece placement device is arranged at a middle part of the first connecting plate, and the second and fourth connecting plates are provided with a second workpiece placement device;

[0010] The third connecting plate is fixedly connected with the second sliding seat of the horizontal movement servo module, and the second, third and fourth connecting plates move leftward and rightward along the workpiece under the action of the horizontal movement servo module.

[0011] Further, the first workpiece placement device comprises two first support plates, and a first placement plate is arranged on the two first support plates, a first support block is arranged at the bottom end of the first placement plate, and the first support block is L-shaped; a first opening is arranged on the first placement plate, and a clamping device is arranged on a first connecting plate located at the first opening.

[0012] Further, the second workpiece placement device comprises two second support plates, one of which is arranged on the second connecting plate, and the other is arranged on the fourth connecting plate, a second placement plate is arranged on the two second support plates, a second support block is arranged at the bottom end of the second placement plate, and the second support block is L-shaped; a second opening is arranged on the second placement plate, and a clamping device is arranged on a third connecting plate located at the second opening; the first placement plate and the second placement plate are arranged in the same plane, and the first workpiece placement device and the second workpiece placement device form a workpiece placement position.

[0013] Further, the clamping device is configured to clamp the workpiece, and the clamping device comprises a first driving device, a connecting block and a pressing block, the connecting block is fixed with the driving shaft of the first driving device through a fastener, and the connecting block and the pressing block are fixed, the first driving device is configured to drive the connecting block and the pressing block to rotate and drive the pressing block to press or move away from the workpiece.

[0014] Further, the working box comprises a working box frame, a start button, a pause button, a touch screen, a display and an alarm are arranged on the working box frame, an upper computer and an electric control cabinet are arranged in the working box, the start button and the pause button are connected with the digital quantity input terminal of the PLC of the electric control cabinet, and switch signals are transmitted through hard-wire connection; the touch screen is connected with the PLC in the electric control cabinet through communication lines (such as RS232 and Ethernet), and communicates with the upper computer through a network; the display is connected with the PLC of the electric control cabinet or the upper computer, the alarm is connected with the relay output terminal of the PLC of the electric control cabinet, and the upper computer is connected with the electric control cabinet through Ethernet or a special communication protocol (such as Modbus and OPC).

[0015] Another aspect of the present application also provides a detection method of a closed tube detector of a D-shaped manifold in a car heat exchanger, the detection method comprising:

[0016] (1) power on and air on the detector, then turn on the upper computer and the monitoring software, if there is no alarm on the touch screen, click the automatic reset picture;

[0017] (2) place the workpiece to be detected on the first support block and the second support block, and press the start button to start the equipment;

[0018] (3) The transverse servo module drives the second servo module and the fourth servo module to move towards the workpiece to be detected under the control of the PLC, and stops moving after abutting against the workpiece to be detected;

[0019] (4) The clamping device rotates the connecting block and the pressing block under the control of the PLC, and the first driving device drives the connecting block and the pressing block to rotate to the opposite side of the workpiece to be detected, and then drives the connecting block and the pressing block to press the workpiece to be detected, and stops moving after pressing;

[0020] (5) Under the control of the PLC, the endoscope device matched with the first servo module, the second servo module, the third servo module and the fourth servo module moves to the pipe opening of the workpiece to be detected under the action of the servo motor, the detection probe collects the image of the pipe opening, the original electrical signal output by the detection probe is converted into a USB standard data format through the endoscope body, and then is transmitted to the upper computer through the USB cable, and whether the pipe opening meets the requirements is analyzed through the monitoring software; after the current pipe opening detection is completed, the endoscope device moves to the next pipe opening, and the collection and comparison process is repeated until all pipe openings are detected;

[0021] (6) The first servo module, the second servo module, the third servo module and the fourth servo module return to the original position, that is, the light barrier is sensed by the original position photoelectric switch;

[0022] (7) The clamping device returns to the original position;

[0023] (8) The transverse servo module returns to the original position;

[0024] (9) The workpiece is removed, and the detection is completed.

[0025] Further, the monitoring software adopts a high-precision image recognition algorithm, and compares the collected image with a standard pipe opening state image, if the comparison is successful, the collected image displayed on the display is green, and if the comparison is unsuccessful, the collected image displayed on the display is red.

[0026] The present application has the following beneficial effects:

[0027] (1) The present application tilts the fixed plate, which facilitates the placement of the workpiece to be detected, and reduces the volume of the overall structure and the occupied horizontal area through inclined placement;

[0028] (2) The present application changes the distance between the first workpiece to be detected and the second workpiece to be detected through the transverse servo module, which can meet the detection requirements of workpieces to be detected of different sizes, and can fix the workpiece to be detected during the movement of the transverse servo module, and further fix the workpiece to be detected through the clamping device, thereby ensuring the stability of the workpiece to be detected;

[0029] (3) The present application places the endoscope device matched therewith in the D-shaped manifold of the workpiece to be detected by the first servo module, the second servo module, the third servo module and the fourth servo module, and the display can clearly show the state of the D-shaped manifold port taken by the endoscope device, so as to realize the detection of the state of the D-shaped manifold port and reduce the NG rate of the product;

[0030] (4) The present application sets multiple endoscope devices to simultaneously detect the ports of the workpiece to be detected, accelerates the detection process and improves the work efficiency, and the collected image is compared with the standard port state image, and the color is distinguished to determine whether the comparison is passed, so that it can be clearly understood which port does not meet the requirements BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a plan view of the structure in Example 1.

[0032] Figure 2 is a perspective view of Example 1.

[0033] Figure 3 is a structure diagram of the first servo module in Example 1.

[0034] Figure 4 is a structure diagram of the first servo module without the endoscope device in Example 1.

[0035] Figure 5 is a partial internal diagram of the horizontal movement servo module in Example 1.

[0036] Figure 6 is a schematic diagram of the endoscope device in Example 1.

[0037] Figure 7 is a field of view diagram of the endoscope device in Example 1.

[0038] Figure 8 is a position diagram of the horizontal movement servo module, the first servo module, the second servo module, the third servo module and the fourth servo module in Example 1.

[0039] Figure 9 is a partial view of the first workpiece placing device in Example 1.

[0040] Figure 10 is a second workpiece placing device in Example 1.

[0041] Figure 11 is a schematic diagram of the pressing device in Example 1.

[0042] Figure 12 is a back view of Example 1. DETAILED DESCRIPTION

[0043] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments, but this embodiment is not intended to limit the present invention. All similar structures and similar variations of the present invention should be included in the scope of protection of the present invention. The semicolons in the present invention represent the relationship of and, and the English letters in the present invention are case-sensitive.

[0044] Example 1

[0045] like Figures 1-3 As shown, this embodiment provides a closed tube detector for a D-type manifold in an automobile heat exchanger, comprising a working box 1, wherein an inclined fixed plate 9 is provided in the working box 1, and a transverse servo module 2, a first servo module 3, a second servo module 4, a third servo module 5 and a fourth servo module 6 are provided above the fixed plate 9, and an endoscope device 7 is provided on each of the first servo module 3, the second servo module 4, the third servo module 5 and the fourth servo module 6. The driving directions of the first servo module 3 and the third servo module 5 toward the pipe opening of the workpiece to be inspected are relatively arranged, and the driving directions of the second servo module 4 and the fourth servo module 6 toward the pipe opening of the workpiece to be inspected are relatively arranged. The first servo module 3, the second servo module 4, the third servo module 5 and the fourth servo module 6 drive the endoscope device 7 matched thereto to move up and down toward the D-type manifold of the workpiece to be inspected 8, and the transverse servo module 2 is configured to drive the second servo module 4 and the fourth servo module 6 to move left and right toward the workpiece to be inspected 8, thereby clamping or releasing the workpiece to be inspected 8. The central axes of the first servo module 3 and the third servo module 5 completely overlap, and the central axes of the second servo module 4 and the fourth servo module 6 completely overlap. The first servo module 3 / third servo module 5 and the second servo module 4 / fourth servo module 6 are arranged in parallel. The D-shaped tube is a "special-shaped manifold" tailored for automotive heat exchangers.

[0046] like Figure 4 As shown, the first servo module 3, the second servo module 4, the third servo module 5 and the fourth servo module 6 all include a first base 31, a first ball screw (blocked and not shown), a first slide 32, a first light blocker 33, three first photoelectric switches 34, a first servo motor 35, and a first linear guide 36. The first linear guide 36 is arranged on the base 31, and the first servo motor 35 and the first ball screw (blocked and not shown) transmit power. The first slide 33 performs linear motion along the first linear guide 36 through the rotation action of the first ball screw (blocked and not shown). The three first photoelectric switches 34 are installed on the side of the first base 31, and the first light blocker 33 is installed on the first slide 32.

[0047] like Figure 5As shown, the horizontal movement servo module 2 includes a second base 21, a second cover plate 22, a second ball screw 23, a second sliding seat 24, a second light barrier 25, a second photoelectric switch 26, a second servo motor 27, and two second linear guides 28 locked on the left and right sides of the second base 21. The second servo motor 27 is in power transmission with the second ball screw 23. The second sliding seat 24 moves linearly along the second linear guide 28 through the rotating action of the second ball screw 23. The second photoelectric switch 26 is mounted on the side of the second base 21, and the second light barrier 25 is mounted on the second sliding seat. The second cover plate 22 covers the second base 21.

[0048] As shown in the figure, Figures 6-7 As shown in the figure, the endoscope device 7 includes a detection probe 71, an endoscope body 72, and a USB cable 73. The detection probe 71 and the endoscope body 72 are designed in an integrated manner. The endoscope body is configured to convert the original electrical signal output by the detection probe into a USB standard data format. The detection probe 71 includes an optical lens, an illumination element (such as an LED), and an image sensor (which converts optical signals into electrical signals). The detection probe 71 is configured to collect images inside the nozzle. The slender shape of the detection probe is adapted to the insertion of the nozzle. The endoscope body 72 is provided with an integrated signal processing circuit (which preliminarily processes sensor electrical signals, such as noise reduction and encoding) and an interface circuit. The endoscope body is fixed on the sliding seat 32 through fasteners. The USB cable 73 is configured to transmit the images inside the nozzle collected by the detection probe to the host computer (host computer USB board card) and provide power for the endoscope device. The line-of-sight range of the endoscope device 7 is Figure 7 V-shaped in the middle, which can clearly capture the state inside the nozzle.

[0049] As shown in the figure, Figure 8 As shown in the figure, the fixed plate 9 is further provided with a first connecting plate 91, a second connecting plate 92, a third connecting plate 93, and a fourth connecting plate 94, a first guide rail 96, a second guide rail 97, a third guide rail 98, and a fourth guide rail 99. The third connecting plate 93 is fixedly connected with the second connecting plate 92 and the fourth connecting plate 94 through the cushion block 95.

[0050] The first connecting plate 91 is arranged on the first guide rail 96 and the fourth guide rail 99 through a first sliding block 911 and a second sliding block 912. The second connecting plate 92 is arranged on the first guide rail 96 and the second guide rail 97 through a third sliding block 921 and a fourth sliding block 922. The fourth connecting plate 94 is arranged on the third guide rail 98 and the fourth guide rail 99 through a fifth sliding block 941 and a sixth sliding block 942.

[0051] The two ends of the first connecting plate 91 are respectively provided with a first servo module 3 and a third servo module 5, the second connecting plate 92 is provided with a second servo module 4, and the fourth connecting plate 94 is provided with a fourth servo module 6; the middle part of the first connecting plate 91 is provided with a first workpiece placing device 10, and the second connecting plate 92 and the fourth connecting plate 94 are provided with a second workpiece placing device 12.

[0052] The third connecting plate 93 is fixedly connected with the second sliding seat 24 of the transverse servo module 2, and under the action of the transverse servo module 2, the second connecting plate 92, the third connecting plate 93 and the fourth connecting plate 94 move left and right along the workpiece 8.

[0053] As shown in Figure 9 The first workpiece placing device 10 includes two first support plates 101, the first support plates 101 are provided with a first placing plate 102, the bottom end of the first placing plate 102 is provided with a first support block 103, and the first support block 103 is L-shaped; the first placing plate 102 is provided with a first opening 104, and the first connecting plate 91 located at the first opening 104 is provided with a clamping device 11.

[0054] As shown in Figure 10 The second workpiece placing device includes two second support plates 121, one of which is arranged on the second connecting plate 92, and the other is arranged on the fourth connecting plate 94, and the second support plates 121 are provided with a second placing plate 122, the bottom end of the second placing plate 122 is provided with a second support block 123, and the second support block 123 is L-shaped; the second placing plate 122 is provided with a second opening 124, and the third connecting plate 93 located at the second opening 124 is also provided with a clamping device 11; the first placing plate 102 and the second placing plate 122 are arranged in the same plane; the first workpiece placing device 10 and the second workpiece placing device 12 constitute a workpiece placing position. The first support block and the second support block are used to support the workpiece to be detected.

[0055] As shown in Figure 11 The clamping device 11 is configured to clamp the workpiece 8, and the clamping device 11 includes a first driving device 111, a connecting block 112 and a pressing block 113, the connecting block 112 is fixed with the driving shaft of the first driving device 111 through fasteners, the connecting block 112 and the pressing block 113 are fixed, and the first driving device 111 is configured to drive the connecting block 112 and the pressing block 113 to rotate and drive the pressing block 113 to press or move away from the workpiece 8 to be detected.

[0056] As shown in Figure 11As shown, the working box 1 comprises a working box frame, and a start button, a pause button, a touch screen 15, a display 16 and an alarm are arranged on the working box frame, and an upper computer and an electric control cabinet 19 are arranged in the working box 1, the start button and the pause button are connected with digital quantity input terminals of a PLC of the electric control cabinet, and switch signals are transmitted through hard-wire connection; the touch screen 15 is connected with the PLC in the electric control cabinet 19 through communication lines (such as RS232 and Ethernet), and communicates with the upper computer through a network; the display 16 is connected with the upper computer or the PLC of the electric control cabinet 19, and the alarm is connected with relay output terminals of the PLC of the electric control cabinet 19, and is controlled by the controller to start and stop, and reminds an operator (such as equipment failure, parameter exceeding, process timeout) through sound and light alarm (such as a buzzer + warning light); the upper computer is connected with the electric control cabinet through Ethernet or a special communication protocol (such as Modbus and OPC). The electric control cabinet 19 is a core control unit, integrates all input and output signals, and is a "central connection point" of each component. A support frame 20 is arranged below the fixing plate 9 and used for supporting the fixing plate 9, and a cross beam is arranged in the working box 1, and the fixing plate 9 is placed obliquely on the cross beam, so that the working box behind the fixing plate 9 is divided into two spaces, and the lower space is used for placing the electric control cabinet 19.

[0057] Preferably, a support slot 20 is arranged on the fixing plate 9, the support slot 20 is in an L shape, a short side of the L shape is fixedly connected with the fixing plate 9, a long side of the L shape is provided with a slot, a width of the slot is consistent with a width of the first connecting plate 91, and the slot is configured to limit the first connecting plate 91 in the slot 201, so that the first connecting plate 91 is prevented from moving.

[0058] Universal wheels 23 are arranged at the bottom of the working box 1, so that the working box 1 is convenient to move. Doors are arranged on the front, back, left and right of the working box 1, so that each component is convenient to overhaul and check.

[0059] Embodiment 2

[0060] The embodiment provides a detection method of a closed tube detector of a D-shaped manifold in an automobile heat exchanger, and the detection method comprises the following steps:

[0061] S1, power supply and air supply are performed on the detector, then an upper computer and monitoring software are turned on, and if there is no alarm on the touch screen 15, an automatic reset picture is clicked;

[0062] S2, a workpiece 8 to be detected is placed on first and second supporting blocks 103 and 123, and a start button is pressed to start the equipment;

[0063] S3, under the control of a PLC, a horizontal moving servo module 2 drives a second servo module 4 and a fourth servo module 6 to move towards the workpiece 8 to be detected, and stops moving until abutting against the workpiece 8 to be detected;

[0064] S4, under the control of the PLC, the first driving device 111 drives the connecting block 112 and the pressing block 113 to rotate, and the pressing block 113 is rotated to the opposite side of the workpiece 8 to be detected, and then the first driving device 111 drives the connecting block 112 and the pressing block 113 to press the workpiece 8 to be detected, and stops moving after being pressed;

[0065] S5, under the control of the PLC, the endoscope device 7 matched with the first servo module 3, the second servo module 4, the third servo module 5 and the fourth servo module 6 moves to the pipe opening of the workpiece 8 to be detected under the action of the servo motor, the detection probe 71 collects the image of the pipe opening, the original electric signal output by the detection probe 71 is converted into USB standard data format through the endoscope body 72, and then transmitted to the upper computer through the USB cable 73, and whether the pipe opening meets the requirements is analyzed through the monitoring software; after the current pipe opening detection is completed, the endoscope device 7 moves to the next pipe opening, and the collection and comparison process is repeated until all pipe openings are detected;

[0066] S6, the first servo module 3, the second servo module 4, the third servo module 5 and the fourth servo module 6 return to the original position, that is, the light barrier is sensed by the original position photoelectric switch;

[0067] S7, the clamping device 11 returns to the original position;

[0068] S8, the horizontal movement servo module 2 returns to the original position;

[0069] S9, the workpiece is taken out, and the detection is completed.

[0070] The monitoring software adopts a high-precision image recognition algorithm, and compares images with a standard pipe opening state image, if the comparison is successful, the collected image displayed on the display is green, if the comparison is not successful, the collected image displayed on the display is red. In addition, the specific position is marked above each image, which is convenient for the staff to check.

[0071] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

Claims

1. A closed tube detector for a D-type manifold for use in an automotive heat exchanger, characterized in that, The utility box is internally provided with a fixed plate arranged obliquely, the fixed plate is provided above with a transverse servo module, a first servo module, a second servo module, a third servo module and a fourth servo module, the first servo module, the second servo module, the third servo module and the fourth servo module are all provided with an endoscope device, the driving directions of the first servo module and the third servo module towards the pipe orifice of the workpiece to be detected are oppositely arranged, the driving directions of the second servo module and the fourth servo module towards the pipe orifice of the workpiece to be detected are oppositely arranged, the first servo module, the second servo module, the third servo module and the fourth servo module drive the endoscope devices matched therewith to move up and down in the D-shaped collecting pipe of the workpiece to be detected, and the transverse servo module is configured to drive the second servo module and the fourth servo module to move leftward and rightward of the workpiece to be detected, so as to clamp or release the workpiece to be detected.

2. A closed tube detector for D-type manifolds used in automotive heat exchangers according to claim 1, characterized in that, The first servo module, the second servo module, the third servo module and the fourth servo module all comprise a first base, a first ball screw, a first sliding seat, a first light shielding piece, three first photoelectric switches, a first servo motor and a first linear guide rail, the first linear guide rail is arranged on the first base, the first servo motor is in power transmission with the first ball screw, the first sliding seat moves linearly along the first linear guide rail through the rotation of the first ball screw, the three first photoelectric switches are arranged on the side of the first base, and the first light shielding piece is arranged on the first sliding seat.

3. A closed tube detector for D-type manifolds used in automotive heat exchangers according to claim 1, characterized in that, The transverse servo module comprises a second base, a second cover plate, a second ball screw, a second sliding seat, a second light shielding piece, a second photoelectric switch, a second servo motor and two second linear guide rails, the two second linear guide rails are locked on the left and right sides of the second base, the second servo motor is in power transmission with the second ball screw, the second sliding seat moves linearly along the second linear guide rail through the rotation of the second ball screw, the second photoelectric switch is arranged on the side of the second base, and the second light shielding piece is arranged on the second sliding seat; and the second cover plate covers the second base.

4. A closed tube detector for D-type manifolds used in automotive heat exchangers according to claim 2, characterized in that, The endoscope device comprises a detection probe, an endoscope body and a USB cable, the detection probe and the endoscope body are designed in an integrated manner, the endoscope body is configured to convert the original electric signal output by the detection probe into a USB standard data format; the detection probe comprises an optical lens, an illumination element and an image sensor, and is configured to collect the image inside the pipe orifice; the endoscope body is internally provided with an integrated signal processing circuit and an interface circuit, and is fixed on the first sliding seat through a fastener, and the USB cable is configured to transmit the image inside the pipe orifice collected by the detection probe to an upper computer and supply power for the endoscope device.

5. A closed tube detector for D-type manifold for use in a heat exchanger of an automobile according to claim 3, wherein The fixed plate is further provided above with a first connecting plate, a second connecting plate, a third connecting plate, a fourth connecting plate, a first guide rail, a second guide rail, a third guide rail and a fourth guide rail; the third connecting plate is fixedly connected with the second connecting plate and the fourth connecting plate through a pad respectively. The first connecting plate is arranged on the first guide rail and the fourth guide rail through a first slider and a second slider, the second connecting plate is arranged on the first guide rail and the second guide rail through a third slider and a fourth slider, and the fourth connecting plate is arranged on the third guide rail and the fourth guide rail through a fifth slider and a sixth slider. The first connecting plate is provided with a first servo module and a third servo module at two ends thereof respectively, the second connecting plate is provided with a second servo module, and the fourth connecting plate is provided with a fourth servo module; the first connecting plate is provided with a first workpiece placing device at a middle part thereof, and the second connecting plate and the fourth connecting plate are provided with a second workpiece placing device. The third connecting plate is fixedly connected with a second slider of the transverse servo module, and the second connecting plate, the third connecting plate and the fourth connecting plate move leftward and rightward along the workpiece under the action of the transverse servo module.

6. A closed tube detector for D-tube headers used in automotive heat exchangers according to claim 5, characterized in that, The first workpiece placing device comprises two first supporting plates, and a first placing plate is arranged on the two first supporting plates; a first supporting block in an L shape is arranged at a bottom end of the first placing plate; a first opening is arranged on the first placing plate, and a clamping device is arranged on the first connecting plate at the first opening.

7. A closed tube detector for D-tube headers used in automotive heat exchangers according to claim 6, characterized in that, The second workpiece placing device comprises two second supporting plates, one of which is arranged on the second connecting plate and the other of which is arranged on the fourth connecting plate; a second placing plate is arranged on the two second supporting plates; a second supporting block in an L shape is arranged at a bottom end of the second placing plate; a second opening is arranged on the second placing plate, and a clamping device is arranged on the third connecting plate at the second opening.

8. A dead leg detector for a D-tube header in an automotive heat exchanger according to claim 7, wherein The clamping device is configured to clamp the workpiece, and the clamping device comprises a first driving device, a connecting block and a pressing block; the connecting block is fixed with a driving shaft of the first driving device through a fastener; the connecting block and the pressing block are fixed; and the first driving device is configured to drive the connecting block and the pressing block to rotate and drive the pressing block to press or move away from the workpiece.

9. A closed tube detector for D-tube headers used in automotive heat exchangers according to claim 1, characterized in that, The working box comprises a working box frame, a start button, a pause button, a touch screen, a display and an alarm are arranged on the working box frame, an upper computer and an electric control cabinet are arranged in the working box, the start button and the pause button are connected with digital input terminals of a PLC of the electric control cabinet, and switch signals are transmitted through hard-wire connection; the touch screen is connected with the PLC in the electric control cabinet through communication lines and communicates with the upper computer through a network; the display is connected with the upper computer or the PLC of the electric control cabinet, and the alarm is connected with relay output terminals of the PLC of the electric control cabinet; and the upper computer is connected with the electric control cabinet through Ethernet or a special communication protocol.

10. A detection method for a closed tube detector of a D-type header used in an automobile heat exchanger, characterized by, The detection method is suitable for the detector in any one of claims 1-9, and the detection method comprises: (1) power on and air on the detector, then turn on the upper computer and the monitoring software, and if there is no alarm on the touch screen, click the automatic reset picture; (2) place the workpiece to be detected on the first supporting block and the second supporting block, and press the start button to start the equipment; (3) Under the control of the PLC, the lateral servo module drives the second servo module and the fourth servo module to move toward the workpiece to be measured until they stop moving after they are close to the workpiece to be measured; (4) Under the control of the PLC, the first driving device of the clamping device drives the connecting block and the pressing block to rotate, rotates the pressing block to the opposite side of the workpiece to be inspected, and then the first driving device drives the connecting block and the pressing block to press the workpiece to be inspected, and stops moving after pressing; (5) Under the control of the PLC, the endoscope devices equipped with the first servo module, the second servo module, the third servo module, and the fourth servo module are respectively moved to the set pipe openings of the workpiece to be inspected under the action of their servo motors, and the detection probe collects the image of the pipe opening. The original electrical signal output by the detection probe is converted into a USB standard data format through the endoscope body, and then transmitted to the host computer through a USB cable. The monitoring software analyzes whether the pipe opening meets the requirements; after completing the current pipe opening inspection, the endoscope device moves to the next pipe opening and repeats the collection and comparison process until all pipe openings are inspected; (6) The first servo module, the second servo module, the third servo module, and the fourth servo module return to their original positions; (7) The clamping device returns to its original position; (8) The lateral servo module returns to its original position; (9) Remove the workpiece and complete the inspection.

11. A detection method of a closed tube detector for a D-shaped manifold for use in an automotive heat exchanger according to claim 10, characterized in that, The monitoring software uses a high-precision image recognition algorithm to perform image comparison with a standard nozzle status diagram. If the comparison is successful, the collected image displayed on the monitor will be green. If the comparison is unsuccessful, the collected image displayed on the monitor will be red.

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