Pressure loss detection equipment for workpiece

Abstract

The utility model relates to pressure loss detection equipment for a workpiece, and the equipment comprises a workbench which is provided with a to-be-detected workpiece; the water inlet pipe is provided with a first inlet communicated with an external water source and a first outlet communicated with an inlet of a to-be-detected channel on a to-be-detected workpiece; the water outlet pipe is provided with a second inlet and a second outlet, and the second inlet is communicated with the outlet of the to-be-detected channel on the to-be-detected workpiece; the first pressure detection module is arranged on the water inlet pipe and is positioned between the first inlet and the first outlet; the second pressure detection module is arranged on the water outlet pipe and located between the second inlet and the second outlet; and the controller is electrically connected with the first pressure detection module and the second pressure detection module, and obtains a to-be-detected channel pressure loss detection result of the to-be-detected workpiece by comparing detection results of the first pressure detection module and the second pressure detection module. The detection device has the advantages of being simple in structure, easy to implement, free of influence on workpieces and high in accuracy of detection results.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure loss detection of workpieces, in particular to a pressure loss detection device for workpieces. Background Art

[0002] In the process of workpiece production, in order to ensure the factory quality of workpieces, it is usually necessary to perform pressure loss tests on the workpieces to ensure that the tolerance of the supplied workpieces is within an acceptable range. The commonly used pressure loss detection method in the prior art is to detect the air tightness of the workpiece to achieve pressure loss detection of the workpiece. For details, please refer to a workpiece pressure loss airtightness detection machine disclosed in the Chinese utility model patent with patent number ZL202022361034.7 (authorization announcement number CN212963899U). The detection machine includes a workpiece blocking mechanism to keep the workpiece airtight, and a workpiece gas injection mechanism to inject gas into the workpiece, so as to detect whether the internal air tightness of the workpiece is qualified, and finally realize the pressure loss detection of the workpiece.

[0003] Although the above-mentioned detection machine can realize the pressure loss detection of the workpiece, the above-mentioned detection machine has the following limitations: since the above-mentioned method of injecting gas is prone to leakage, the difficulty of this method of detecting air tightness is that it is not easy to maintain the sealing between the workpiece plugging mechanism and the workpiece, and since the gas pressure in the workpiece is too high, it is easy to cause the workpiece to rupture, thereby affecting the service life of the workpiece. Therefore, further improvements are needed to the existing technology. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a pressure loss detection device for workpieces which has no influence on the workpieces and is easy to detect, in view of the above-mentioned prior art.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: the pressure loss detection device for workpieces comprises:

[0006] A workbench on which the workpiece to be inspected is placed;

[0007] The invention is characterized in that it also includes:

[0008] A water inlet pipe having a first inlet connected to an external water source and a first outlet connected to an inlet of a channel to be inspected on the workpiece to be inspected;

[0009] The water outlet pipe has a second inlet and a second outlet, wherein the second inlet is connected to the outlet of the channel to be inspected on the workpiece to be inspected;

[0010] A first pressure detection module is provided on the water inlet pipe and is located between the first inlet and the first outlet, and is used to detect the pressure in the water inlet pipe;

[0011] A second pressure detection module is provided on the water outlet pipe and is located between the second inlet and the second outlet, and is used to detect the pressure in the water outlet pipe;

[0012] The controller is electrically connected to the first pressure detection module and the second pressure detection module, and is configured to: compare the detection results of the first pressure detection module and the second pressure detection module to obtain the pressure loss detection result of the to-be-detected channel of the to-be-detected workpiece.

[0013] Preferably, the water inlet pipe is also provided with a first flow detection module for detecting the water inlet flow in the water inlet pipe, and the water outlet pipe is also provided with a second flow detection module for detecting the water outlet flow in the water outlet pipe, and the first flow detection module and the second flow detection module are both electrically connected to the controller.

[0014] In order to adjust the water flow rate of the water inlet pipe, the water inlet pipe is provided with at least one discharge valve located upstream of the first pressure detection module.

[0015] Preferably, the relief valve is a manual relief valve, or the relief valve is an electric relief valve, and the controller is electrically connected to the first flow detection module and the electric relief valve.

[0016] In order to improve the stability of the connection between the water inlet pipe and the entrance of the channel to be detected on the workpiece to be detected, the water inlet pipe includes a first rigid pipe, a hose and a second rigid pipe sequentially distributed along the fluid flow path, and the workbench is also provided with a first driving mechanism for driving the second rigid pipe to move up and down. The outlet of the second rigid pipe can be connected or separated with the entrance of the channel to be detected on the workpiece to be detected under the drive of the first driving mechanism, and the second rigid pipe can always maintain the connection with the first rigid pipe through the deformation of the hose during the movement. In this way, the connection between the water inlet pipe and the entrance of the channel to be detected on the workpiece to be detected can be maintained more stably under the drive of the first driving mechanism, and the structure is simple.

[0017] There are many kinds of structures of the above-mentioned first driving mechanism. Preferably, the first driving mechanism includes a first cylinder having a first piston rod, and the front end of the first piston rod of the first cylinder is provided with a first mounting plate for mounting the second rigid tube, so that the second rigid tube can be close to or away from the entrance of the channel to be inspected on the workpiece to be inspected.

[0018] In order to prevent the workpiece to be inspected from moving during the inspection process to ensure the accuracy of the inspection, the workbench is also provided with a clamping mechanism for clamping the workpiece to be inspected.

[0019] There are many structures of the clamping mechanism. Preferably, the clamping mechanism comprises a second cylinder having a second piston rod. The front end of the second piston rod of the second cylinder is provided with a second mounting plate for mounting the water outlet pipe. The second mounting plate has the following two states:

[0020] In the first state, the second mounting plate presses the workpiece to be inspected, and the second inlet of the water outlet pipe is connected to the outlet of the channel to be inspected on the workpiece to be inspected;

[0021] In the second state, the second mounting plate releases the workpiece to be inspected, and the second inlet of the water outlet pipe is separated from the outlet of the channel to be inspected on the workpiece to be inspected.

[0022] In order to improve the clamping effect, one of the clamping mechanisms can play a dual role, the clamping mechanism includes a first clamping mechanism for clamping the upper surface of the workpiece to be inspected and a second clamping mechanism for clamping the side surface of the workpiece to be inspected;

[0023] When the outlet of the inspection channel of the workpiece to be inspected extends in a horizontal direction, the second clamping mechanism is the second cylinder mentioned above;

[0024] When the outlet of the detection channel of the workpiece to be detected extends in a vertical direction, the first clamping mechanism is the second cylinder mentioned above. In this way, one of the clamping mechanisms is selected according to the extending direction of the outlet of the detection channel of the workpiece to be detected, so that the clamping mechanism can not only play a clamping role, but also keep the inlet of the water outlet pipe and the outlet of the detection channel on the workpiece to be detected more stably connected, so the structure is simple, the cost is low, and the connection stability is better.

[0025] In order to prevent errors, the workbench is provided with a positioning pin inserted into the positioning part of the workpiece to be detected, so that the workpiece to be detected can be positioned by the positioning pin when it is installed. This can effectively avoid installation errors of the workpiece to be detected and improve detection efficiency.

[0026] Compared with the prior art, the utility model has the advantages that: by connecting the outlet of the water inlet pipe with the inlet of the channel to be detected on the workpiece to be detected and connecting the inlet of the water outlet pipe with the outlet of the channel to be detected on the workpiece to be detected, the external water source passes through the water inlet pipe and the channel to be detected on the workpiece to be detected in turn and is discharged from the water outlet pipe, so that the pressure loss detection result of the channel to be detected can be obtained by comparing the pressure detection results on the water inlet pipe and the water outlet pipe. Therefore, the detection equipment has a simple structure, is easy to implement, has no effect on the workpiece, and has a high accuracy of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the workpiece to be detected in the embodiment of the utility model;

[0028] Figure 2 It is a structural schematic diagram of the pressure loss detection device in the embodiment of the utility model;

[0029] Figure 3 for Figure 2 Schematic diagram of some structures in ;

[0030] Figure 4 It is a control system block diagram of the pressure loss detection device in the embodiment of the utility model. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] like Figures 1 to 4 As shown in FIG. 1 , a preferred embodiment of the utility model is shown. In this embodiment, the pressure loss detection device for a workpiece includes a workbench 1, a water inlet pipe 3, a water outlet pipe 4, a first pressure detection module 5, a second pressure detection module 6 and a controller 7. The first pressure detection module 5 and the second pressure detection module 6 both use pressure sensors.

[0033] A workpiece 2 to be inspected is placed on the workbench 1; a water inlet pipe 3 has a first inlet 3a connected to an external water source and a first outlet 3b connected to an inlet 21 of a channel to be inspected on the workpiece 2 to be inspected; a water outlet pipe 4 has a second inlet 4a and a second outlet 4b, and the second inlet 4a is connected to an outlet 22 of the channel to be inspected on the workpiece 2 to be inspected; a first pressure detection module 5 is arranged on the water inlet pipe 3 and is located between the first inlet 3a and the first outlet 3b, and is used to detect the pressure in the water inlet pipe 3; a second pressure detection module 6 is arranged on the water outlet pipe 4 and is located between the second inlet 4a and the second outlet 4b, and is used to detect the pressure in the water outlet pipe 4; a controller 7 is electrically connected to the first pressure detection module 5 and the second pressure detection module 6, and is configured to: compare the detection results of the first pressure detection module 5 and the second pressure detection module 6 to obtain a pressure loss detection result of the channel to be inspected of the workpiece 2 to be inspected.

[0034] like Figure 3 As shown, the water inlet pipe 3 includes a first rigid pipe 31, a hose 32, and a second rigid pipe 33 sequentially distributed along the fluid flow path. The workbench 1 is also provided with a first driving mechanism 11 for driving the second rigid pipe 33 to move up and down. The second rigid pipe 33 can be driven by the first driving mechanism 11 to connect or separate its outlet with the inlet 21 of the to-be-detected channel on the to-be-detected workpiece 2. The second rigid pipe 33 can always maintain communication with the first rigid pipe 31 during the movement through the deformation of the hose 32. In this embodiment, the first driving mechanism 11 includes a first cylinder 111 having a first piston rod 111a. The front end of the first piston rod 111a of the first cylinder 111 is provided with a first mounting plate 112 for mounting the second rigid pipe 33, so that the second rigid pipe 33 can approach or move away from the inlet 21 of the to-be-detected channel on the to-be-detected workpiece 2.

[0035] In addition, the water inlet pipe 3 is also provided with a first flow detection module 8a for detecting the water flow in the water inlet pipe 3, and the first flow detection module 8a is arranged downstream of the first pressure detection module 5. In addition, the water outlet pipe 4 is also provided with a second flow detection module 8b for detecting the water flow out of the water outlet pipe 3, and the second flow detection module 8b is arranged downstream of the second pressure detection module 6. The first flow detection module 8a and the second flow detection module 8b are both flow sensors, and the first flow detection module 8a and the second flow detection module 8b are both electrically connected to the controller 7. During the detection, the detection device detects the workpiece 2 to be detected by providing pure water of multiple different flow rates (in this embodiment, the flow rates are 8L / min, 10L / min and 12L / min respectively) to improve the detection accuracy, and only when the detection result of the second flow detection module 8b is close to the detection result of the first flow detection module 8a, it is determined that the water has reached a stable state, and the detection results of the first pressure detection module 5 and the second pressure detection module 6 are read respectively when the water reaches a stable state, so as to improve the accuracy of the detection result.

[0036] At least one relief valve 9 is provided on the water inlet pipe 3 and is located upstream of the first pressure detection module 5. The relief valve 9 can be a manual relief valve or an electric relief valve, and the controller 7 is electrically connected to the first flow detection module 8a and the electric relief valve.

[0037] The workbench 1 is provided with a positioning portion 20 ( Figure 3 The positioning portion 20 is a through hole, so that the workpiece 2 to be detected can be positioned by the positioning pin 13 when it is installed. The workbench 1 is also provided with a clamping mechanism 12 for clamping the workpiece 2 to be detected. In this embodiment, the clamping mechanism 12 includes a second cylinder 121 with a second piston rod 121a, and a second mounting plate 122 for mounting the water outlet pipe 4 is provided at the front end of the second piston rod 121a of the second cylinder 121. The second mounting plate 122 has the following two states: in the first state, the second mounting plate 122 clamps the workpiece 2 to be detected, and the second inlet 4a of the water outlet pipe 4 is connected to the outlet 22 of the channel to be detected on the workpiece 2 to be detected; in the second state, the second mounting plate 122 releases the workpiece 2 to be detected, and the second inlet 4a of the water outlet pipe 4 is separated from the outlet 22 of the channel to be detected on the workpiece 2 to be detected.

[0038] In order to achieve a better clamping effect on the workpiece 2 to be inspected, the clamping mechanism 12 in this embodiment includes a first clamping mechanism 12a for clamping the upper surface of the workpiece 2 to be inspected and a second clamping mechanism 12b for clamping the side of the workpiece 2 to be inspected; when the outlet 22 of the inspection channel of the workpiece 2 to be inspected extends in a horizontal direction, the second clamping mechanism 12b is the above-mentioned second cylinder 121; when the outlet 22 of the inspection channel of the workpiece 2 to be inspected extends in a vertical direction, the first clamping mechanism 12a is the above-mentioned second cylinder 121.

[0039] The working process of the pressure loss detection device in this embodiment is as follows:

[0040] A. Place the workpiece 2 to be inspected on the workbench 1, and align the positioning pin 13 of the workbench 1 with the positioning portion 20 of the workpiece 2 to be inspected;

[0041] B. By driving the first cylinder 111 and the second cylinder 121 to operate (the control end of the first cylinder 111 and the control end of the second cylinder 121 can be connected to the controller 7, so that the first cylinder 111 and the second cylinder 121 can be automatically controlled to operate), the first outlet 3b of the water inlet pipe 3 is connected to the inlet 21 of the to-be-detected channel on the to-be-detected workpiece 2, and the second inlet 4a of the water outlet pipe 4 is connected to the outlet 22 of the to-be-detected channel on the to-be-detected workpiece 2 ( Figure 3 A sealing ring is also provided at the connecting point to improve the sealing effect);

[0042] C. Turn on the external water source. When the controller 7 detects that the detection results of the first flow detection module 8a and the second flow detection module 8b are close (the best is that the readings of the first flow detection module 8a and the second flow detection module 8b are the same, and of course the difference in the detection results of the first flow detection module 8a and the second flow detection module 8b can also be within a preset range), the controller 7 obtains the data of the first pressure detection module 5 and the second pressure detection module 6, and compares the detection results of the first pressure detection module 5 and the second pressure detection module 6 to obtain the pressure loss detection result of the channel to be detected of the workpiece 2 to be detected.

Claims

1. A pressure loss detection device for a workpiece, comprising: A workbench (1) on which a workpiece (2) to be inspected is placed; The invention is characterized in that: A water inlet pipe (3) having a first inlet (3a) connected to an external water source and a first outlet (3b) connected to an inlet (21) of a channel to be inspected on a workpiece to be inspected (2); A water outlet pipe (4) having a second inlet (4a) and a second outlet (4b), wherein the second inlet (4a) is connected to an outlet (22) of a channel to be inspected on the workpiece to be inspected (2); A first pressure detection module (5) is arranged on the water inlet pipe (3) and is located between the first inlet (3a) and the first outlet (3b), and is used to detect the pressure in the water inlet pipe (3); A second pressure detection module (6) is disposed on the water outlet pipe (4) and is located between the second inlet (4a) and the second outlet (4b), and is used to detect the pressure in the water outlet pipe (4); The controller (7) is electrically connected to the first pressure detection module (5) and the second pressure detection module (6), and is configured to compare the detection results of the first pressure detection module (5) and the second pressure detection module (6) to obtain a pressure loss detection result of the channel to be detected of the workpiece (2) to be detected.

2. The pressure loss detection device according to claim 1, characterized in that: The water inlet pipe (3) is also provided with a first flow detection module (8a) for detecting the water inlet flow rate in the water inlet pipe (3), and the water outlet pipe (4) is also provided with a second flow detection module (8b) for detecting the water outlet flow rate in the water outlet pipe (4), and the first flow detection module (8a) and the second flow detection module (8b) are both electrically connected to the controller (7).

3. The pressure loss detection device according to claim 2, characterized in that: The water inlet pipe (3) is provided with at least one discharge valve (9) located upstream of the first pressure detection module (5).

4. The pressure loss detection device according to claim 3, characterized in that: The discharge valve (9) is a manual discharge valve, or the discharge valve (9) is an electric discharge valve, and the controller (7) is electrically connected to the first flow detection module (8a) and the electric discharge valve.

5. The pressure loss detection device according to claim 3, characterized in that: The water inlet pipe (3) comprises a first rigid pipe (31), a hose (32) and a second rigid pipe (33) which are sequentially distributed along a fluid flow path. The workbench (1) is also provided with a first driving mechanism (11) for driving the second rigid pipe (33) to move up and down. The outlet of the second rigid pipe (33) can be connected to or separated from the inlet (21) of the channel to be detected on the workpiece (2) to be detected under the drive of the first driving mechanism (11). During the movement, the second rigid pipe (33) can always maintain communication with the first rigid pipe (31) through the deformation of the hose (32).

6. The pressure loss detection device according to claim 5, characterized in that: The first driving mechanism (11) comprises a first cylinder (111) having a first piston rod (111a), and a first mounting plate (112) for mounting a second rigid tube (33) is provided at a front end of the first piston rod (111a) of the first cylinder (111), so that the second rigid tube (33) can be moved closer to or farther from an entrance (21) of a channel to be inspected on a workpiece (2) to be inspected.

7. The pressure loss detection device according to any one of claims 1 to 6, characterized in that: The workbench (1) is also provided with a clamping mechanism for clamping the workpiece (2) to be inspected.

8. The pressure loss detection device according to claim 7, characterized in that: The clamping mechanism comprises a second cylinder (121) having a second piston rod (121a), a second mounting plate (122) for mounting a water outlet pipe (4) is provided at the front end of the second piston rod (121a) of the second cylinder (121), and the second mounting plate (122) has the following two states: In a first state, the second mounting plate (122) presses the workpiece (2) to be inspected, and the second inlet (4a) of the water outlet pipe (4) is connected to the outlet (22) of the channel to be inspected on the workpiece (2) to be inspected; In the second state, the second mounting plate (122) releases the workpiece to be inspected (2), and the second inlet (4a) of the water outlet pipe (4) is separated from the outlet (22) of the channel to be inspected on the workpiece to be inspected (2).

9. The pressure loss detection device according to claim 8, characterized in that: The pressing mechanism comprises a first pressing mechanism (12a) for pressing the upper surface of the workpiece (2) to be inspected and a second pressing mechanism (12b) for pressing the side surface of the workpiece (2) to be inspected; When the outlet (22) of the inspection channel of the workpiece (2) to be inspected extends in a horizontal direction, the second clamping mechanism (12b) is the above-mentioned second cylinder (121); When the outlet (22) of the to-be-detected channel of the to-be-detected workpiece (2) extends in a vertical direction, the first clamping mechanism (12a) is the above-mentioned second cylinder (121).

10. The pressure loss detection device according to claim 9, characterized in that: The workbench (1) is provided with a positioning pin (13) which is inserted into a positioning portion (20) of the workpiece (2) to be detected, so that the workpiece (2) to be detected can be positioned by the positioning pin (13) when being installed.

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