A pressure sensor test fixture

Abstract

This invention discloses a pressure sensor testing fixture, comprising: a fixture body and a pneumatic probe assembly and an electrical probe assembly fixed to the fixture body; the pneumatic probe assembly includes an upper sealing assembly, which includes an upper sealing head, an upper sealing mounting base, an upper sealing cylinder, a locking hook, and an upper sealing fixing plate; it also includes a side sealing assembly, which includes a side sealing head, a side sealing mounting base, a side sealing cylinder, a quick-release knob, a linear guide rail, and a side sealing fixing plate; the electrical probe assembly includes a quick-change head, a plug-in pin, and a connecting plate. The pressure sensor testing fixture of this invention adds a sealing interface, facilitating the replacement of the contact parts between the fixture and the workpiece; the fixture replacement part has a simple structure, facilitating subsequent remanufacturing and reducing fixture manufacturing costs; the fixture is well-suited for all product models, allowing for faster integration into product production.

Description

Technical Field

[0001] This invention relates to the field of measurement tooling technology, and in particular to a pressure sensor test fixture. Background Technology

[0002] The intake pressure sensor is an important component of the automotive engine control system. It works in conjunction with the intake air flow sensor to calculate the amount of air entering the engine and thus control the amount of gasoline supplied to the engine. This ensures that the fuel burns completely inside the engine, providing stable power output and reducing energy waste.

[0003] The calibration of automotive intake pressure sensors plays a decisive role in product quality; therefore, providing a stable and reliable testing environment for intake pressure sensor calibration is extremely important.

[0004] Currently, the test fixtures commonly used in factories are product-specific and cannot be used interchangeably for different product models. Furthermore, the existing fixtures have high investment costs, and adding new product models requires the manufacture of a complete set of fixtures, which increases production costs. Summary of the Invention

[0005] In view of the shortcomings or deficiencies of the prior art, the pressure sensor test fixture provided by the present invention adds a sealing interface to facilitate the replacement of the part of the fixture that contacts the workpiece; the fixture replacement part has a simple structure, which facilitates the later manufacturing of new fixtures and reduces the manufacturing cost of fixtures; the fixture can be well applied to all product models and can be put into product production more quickly.

[0006] A pressure sensor test fixture includes: a fixture body, a pneumatic probe assembly and an electrical probe assembly mounted on the fixture body;

[0007] The gas probe assembly includes an upper sealing assembly for sealing the workpiece in the Z direction, which includes an upper sealing head, an upper sealing mounting base, an upper sealing cylinder, a locking hook, an upper sealing fixing plate, and a pin.

[0008] One end of the upper sealing head is provided with a sealing gasket, which makes a sealed contact with the workpiece being tested;

[0009] The upper sealing fixing plate is fixedly connected to the upper sealing head;

[0010] The upper sealing mounting base is located on one side of the upper sealing fixing plate and has a through hole;

[0011] The locking hook is installed at both ends of the upper sealing mounting base by a detachable pin. The locking hook is provided with a groove, and the groove is engaged with the upper sealing fixing plate.

[0012] The upper sealing cylinder drives the upper sealing mounting seat to reciprocate in the Z direction;

[0013] The gas probe assembly also includes a side sealing assembly for sealing the workpiece in the X direction, which includes a side sealing head, a side sealing mounting base, a side sealing cylinder, a quick knob, a linear guide rail, and a side sealing fixing plate.

[0014] One end of the side sealing plug is provided with a sealing gasket, which makes a sealed contact with the workpiece being tested;

[0015] The side sealing fixing plate is fixedly connected to the side sealing head, and it is provided with threaded holes;

[0016] The side-sealing mounting base is located on one side of the side-sealing fixing plate and has a through hole;

[0017] The tail end of the quick-turn knob has a threaded structure. The quick-turn knob is connected to the threaded hole of the side sealing plate through the through hole of the side sealing mounting base.

[0018] The side-sealing cylinder drives the side-sealing mounting base to move back and forth along the linear guide rail in the X direction;

[0019] The electrical probe assembly is positioned in the Y direction of the workpiece being tested, and includes a quick-change head, a plug-in pin, and a connecting plate.

[0020] The quick-change head is mounted on the connecting plate and has a probe inside. The probe is connected to the workpiece being measured, and one end of the quick-change head has a through hole.

[0021] The connecting plate is provided with a through hole, through which the insertion pin can pass;

[0022] The plug pin passes through the through hole of the connecting plate and engages with the through hole of the quick-change head, allowing the quick-change head and the connecting plate to be detachably connected.

[0023] Furthermore, the number of gas probe assemblies is one or more, and the number of electrical probe assemblies is one or more.

[0024] Furthermore, the sealing gaskets of the upper sealing head and the side sealing head are made of rubber.

[0025] The beneficial effects of this invention are:

[0026] 1. The fixture body is manufactured using precision machining technology, and a sealing interface is added to facilitate the replacement of the parts of the fixture that contact the workpiece.

[0027] 2. The fixture replacement part of this patent has a simple structure, which facilitates the later manufacturing of new fixtures and reduces the cost of fixture manufacturing.

[0028] 3. The fixture of this patent can be well applied to all product models, allowing for faster product production. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the overall pressure sensor test fixture of the present invention;

[0030] Figure 2 This is a cross-sectional view of the gas probe assembly of the present invention;

[0031] Figure 3 This is a cross-sectional view of the sealing component of the present invention;

[0032] Figure 4 This is a schematic diagram of the sealing component of the present invention;

[0033] Figure 5 This is a schematic diagram of the side-sealing assembly of the present invention;

[0034] Figure 6 This is a schematic diagram of the electrical probe assembly of the present invention;

[0035] In the diagram: 100-Gas probe assembly; 110-Upper plugging assembly; 111-Upper plugging head; 112-Upper plugging mounting base; 113-Upper plugging cylinder; 114-Locking hook; 115-Upper plugging fixing plate; 116-Pin; 120-Side plugging assembly; 121-Side plugging head; 122-Side plugging mounting base; 123-Side plugging cylinder; 124-Quick knob; 125-Linear guide rail; 200-Electrical probe assembly; 210-Quick change head; 211-Probe; 220-Plugging pin; 230-Connecting plate; 300-Clamp body. Detailed Implementation

[0036] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0037] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0038] like Figure 1 As shown, a pressure sensor test fixture includes: a fixture body 300, a gas probe assembly 100 and an electrical probe assembly 200 mounted on the fixture body 300;

[0039] like Figure 2 , Figure 3 , Figure 4As shown, the gas probe assembly 100 includes an upper sealing assembly 110 for sealing the workpiece in the Z direction. This assembly includes an upper sealing head 111, an upper sealing mounting base 112, an upper sealing cylinder 113, a locking hook 114, an upper sealing fixing plate 115, and a pin 116. One end of the upper sealing head 111 is provided with a sealing gasket, which makes sealing contact with the workpiece. The upper sealing fixing plate 115 is fixedly connected to the upper sealing head 111. The upper sealing mounting base 112 is located on one side of the upper sealing fixing plate 115 and has a through hole. The locking hook 114 is mounted on both ends of the upper sealing mounting base 112 via a detachable pin 116. The locking hook 114 has a groove, which engages with the upper sealing fixing plate 115. The upper sealing cylinder 113 drives the upper sealing mounting base 112 to reciprocate in the Z direction.

[0040] like Figure 2 , Figure 5 As shown, the gas probe assembly 100 also includes a side sealing assembly 120 for sealing the workpiece in the X direction. This assembly includes a side sealing head 121, a side sealing mounting base 122, a side sealing cylinder 123, a quick-release knob 124, a linear guide rail 125, and a side sealing fixing plate 126. One end of the side sealing head 121 has a sealing gasket that makes sealing contact with the workpiece. The side sealing fixing plate 126 is fixedly connected to the side sealing head 121 and has a threaded hole. The side sealing mounting base 122 is located on one side of the side sealing fixing plate 126 and has a through hole. The quick-release knob 124 has a threaded end and is detachably connected to the side sealing fixing plate 126 by engaging with the threaded hole through the through hole of the side sealing mounting base 122. The side sealing cylinder 123 drives the side sealing mounting base 122 to reciprocate along the linear guide rail 125 in the X direction.

[0041] like Figure 6 As shown, the electrical probe assembly 200 is positioned in the Y direction of the workpiece being tested. It includes a quick-change head 210, a plug-in pin 220, and a connecting plate 230. The quick-change head 210 is mounted on the connecting plate 230 and has a probe 211 inside. The probe 211 is connected to the workpiece being tested, and one end of the quick-change head 210 has a through hole. The connecting plate 230 has a through hole through which the plug-in pin 220 can pass. The plug-in pin 220, through the through hole of the connecting plate 230, engages with the through hole of the quick-change head 210, allowing the quick-change head 210 and the connecting plate 230 to be detachably connected.

[0042] There are one or more gas probe assemblies 100 and one or more electrical probe assemblies 200.

[0043] The sealing gaskets of the upper sealing head 111 and the side sealing head 121 are made of rubber.

[0044] Principle Description: This invention enables performance testing of pressure sensors. The testing involves evaluating the product's performance under varying pressure conditions. Before testing, the product is inflated, and the inflated area is sealed using a gas probe to achieve the required test pressure. The probe 211 on the quick-change head 210 in the electrical probe assembly 200 is connected to the product's pin, and the product's performance is detected by acquiring electrical signals. Depending on the product structure, the product can be tested by replacing appropriate gas probes and different electrical probes.

[0045] After the test part is lifted into position from the turntable, the upper sealing cylinder 113 extends, and the upper sealing head 111 presses against the upper end face of the air inlet on the test part, pressing the two sealing gaskets together. After the upper sealing head 111 completes its action, the side sealing cylinder 123 moves, and the side sealing head 121 presses against the end face of the side air inlet on the test part, pressing the side sealing gasket together. After the side sealing head 121 completes its action, it ensures that the test part is inflated during the test.

[0046] Method for changing the upper sealing plug 111: Open the locking hook 114, remove the original upper sealing plug 111, install the new upper sealing plug 111, and the locking hook 114 will automatically lock the upper sealing plug 111. The fixture can be changed quickly and easily.

[0047] Side sealing plug 121 replacement method: Loosen the quick knob 124, remove the original side sealing plug 121, install the new side sealing plug 121, and then tighten the quick knob 124. The fixture replacement is convenient and quick.

[0048] To change the type of the small quick-change head 210: simply pull out the plug pin 220, remove the original small quick-change head 210 and replace it with the new small change head 210. The clamp type change is convenient and quick.

[0049] Fixture assembly: Open the pressure plate on the main body of the equipment, align the guide pin with the positioning hole on the main body of the equipment, push the fixture into place, lock the pressure plate on the main body of the equipment, connect the probe assembly (electrical signal connection) and the self-sealing quick connector (gas connection) to the equipment, and connect electrical signal connection 1 and electrical signal connection 2 to the equipment automatically. Fixture changeover is convenient and quick.

[0050] The above description is merely an embodiment of the present invention. Commonly known structures and characteristics of the solutions are not described in detail here. It is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Several modifications and improvements can be made without departing from the present invention, and these should also be considered within the scope of protection of the present invention. These modifications will not affect the effectiveness of the present invention or the practicality of the patent.

Claims

1. A pressure sensor testing fixture, characterized in that, include: The fixture body (300), the pneumatic probe assembly (100) and the electrical probe assembly (200) are mounted on the fixture body (300); The gas probe assembly (100) includes an upper sealing assembly (110) for sealing the workpiece in the Z direction, which includes an upper sealing head (111), an upper sealing mounting base (112), an upper sealing cylinder (113), a locking hook (114), an upper sealing fixing plate (115), and a pin (116). The upper sealing head (111) is provided with a sealing gasket at one end, which is in sealed contact with the workpiece being tested; The upper sealing fixing plate (115) is fixedly connected to the upper sealing head (111); The upper sealing mounting base (112) is located on one side of the upper sealing fixing plate (115) and has a through hole; The locking hook (114) is mounted on both ends of the upper sealing mounting base (112) via a detachable pin (116). The locking hook (114) is provided with a groove, and the groove is engaged with the upper sealing fixing plate (115). The upper sealing cylinder (113) drives the upper sealing mounting seat (112) to move back and forth in the Z direction; The gas probe assembly (100) also includes a side sealing assembly (120) for sealing the workpiece in the X direction, which includes a side sealing head (121), a side sealing mounting base (122), a side sealing cylinder (123), a quick knob (124), a linear guide rail (125), and a side sealing fixing plate (126). One end of the side sealing plug (121) is provided with a sealing gasket, which makes a sealed contact with the workpiece being tested; The side sealing fixing plate (126) is fixedly connected to the side sealing head (121), and it is provided with threaded holes; The side sealing mounting base (122) is located on one side of the side sealing fixing plate (126) and has a through hole; The tail end of the quick knob (124) has a threaded structure. The quick knob (124) is connected to the threaded hole of the side sealing plate (126) through the through hole of the side sealing mounting base (122). The side-sealing cylinder (123) drives the side-sealing mounting base (122) to move back and forth in the X direction along the linear guide rail (125); The electrical probe assembly (200) is positioned in the Y direction of the workpiece being tested, and includes a quick-change head (210), a plug pin (220), and a connecting plate (230). The quick-change head (210) is mounted on the connecting plate (230), and a probe (211) is provided inside it. The probe (211) is connected to the workpiece to be tested, and a through hole is provided at one end of the quick-change head (210). The connecting plate (230) is provided with a through hole, through which the plug pin (220) can pass; The plug pin (220) passes through the through hole of the connecting plate (230) and engages with the through hole of the quick-change head (210), so that the quick-change head (210) and the connecting plate (230) can be detachably connected.

2. The pressure sensor test fixture according to claim 1, characterized in that, The number of gas probe assemblies (100) is one or more, and the number of electrical probe assemblies (200) is one or more.

3. The pressure sensor test fixture according to claim 2, characterized in that, The sealing gaskets of the upper sealing plug (111) and the side sealing plug (121) are made of rubber.

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