Tool clamp for air tightness test

Abstract

The utility model discloses a tool clamp for an air tightness test. The tool clamp comprises a frame body, two mounting seats, a first air cylinder and a second air cylinder. The gas path is externally connected with a vacuum pump, and a measuring head is installed at the installation position. After the pipe fitting is placed on the two placing seats, the shaft shoulders at the two ends abut against the first connecting faces of the two mounting seats correspondingly, and movement of the pipe fitting in the first direction is limited. The first air cylinder and the second air cylinder move at the same time, the piston rod extends out, and the two plugs plug the two pipe openings of the pipe fitting. The vacuum pump exhausts air in the pipe fitting, the measuring head measures the air pressure in the pipe fitting, and the air tightness of the pipe fitting is judged according to the measuring condition of the air pressure in the pipe fitting. The device has the advantages of being simple in structure, convenient to operate and capable of improving efficiency.

Description

Technical Field

[0001] This utility model relates to airtightness testing, and in particular to a tooling fixture for airtightness testing. Background Technology

[0002] For pipe fittings connecting two pipe sections, the ends are typically stepped, narrower in the middle and wider at both ends. Air tightness is a crucial parameter for these fittings and is usually tested through random sampling. Because fittings are prone to rolling, a fixture is generally required to hold and secure them during air tightness testing. Currently, a combination of a bench vise and a linear motion module is commonly used as the fixture. After the bench vise holds the fitting in place, the linear motion module moves the vise and fitting together, sealing the pipe opening and the plug. Utility Model Content

[0003] This application provides a tooling fixture for airtightness testing, which can solve the problems of existing tooling fixtures being cumbersome to operate and inefficient.

[0004] This application provides a tooling fixture for airtightness testing, comprising:

[0005] The frame is concave and includes: a horizontal plate and two vertical plates opposite each other in the first direction;

[0006] Two mounting bases are fixedly connected to the horizontal plate; the top surface of the mounting base has a stepped half-hole for placing the stepped end of the pipe fitting.

[0007] The first cylinder is fixedly connected to one of the vertical plates; the piston rod is fixedly connected to a plug for blocking / releasing the pipe opening at the corresponding end of the pipe fitting; the piston rod also has an air passage that can connect the pipe fitting when the pipe opening is blocked.

[0008] The second cylinder is fixedly connected to another vertical plate. The piston rod is fixedly connected to a plug for blocking / releasing the corresponding end of the pipe fitting. The piston rod also has a mounting position for mounting the measuring head.

[0009] In some embodiments, both mounting bases can be adjusted along a first direction to a fixed position on the horizontal plate.

[0010] In some embodiments, the mounting base includes: a base portion for connecting to a horizontal plate, a first portion for providing a larger portion of the semi-hole, and a second portion for providing a smaller portion of the semi-hole; the second portion connects the first portion and the base portion.

[0011] In some embodiments, at least one of the following configurations is also provided: Configuration 1: the first cylinder is a double-acting cylinder, and the air passage penetrates both ends of the piston rod; Configuration 2: the second cylinder is a double-acting cylinder, and the piston rod has a groove connecting the installation position.

[0012] In some embodiments, the outer edge of the plug is beveled.

[0013] In some embodiments, the horizontal plate has two convex grooves corresponding to the position of each of the mounting seats; the wider portion of each convex groove has a nut that restricts rotation; the bottom surface of each mounting seat has two protrusions that enter the narrower portion of the convex groove; and each mounting seat is also provided with a bolt that mates with the nut.

[0014] In summary, this application discloses a fixture for airtightness testing, comprising a frame, two mounting bases, a first cylinder, and a second cylinder. An external vacuum pump is connected to the air circuit, and a measuring head is mounted at the mounting position. After the pipe is placed on the two mounting bases, the shoulders at both ends abut against the first connecting surfaces of the two mounting bases, restricting the movement of the pipe in a first direction. The first and second cylinders move simultaneously, extending the piston rods, and two plugs seal the two ends of the pipe. The vacuum pump evacuates air from the pipe, and the measuring head measures the air pressure inside the pipe. Based on the measured air pressure, the airtightness of the pipe is determined. The advantages include: simple structure, easy operation, and improved efficiency. Attached Figure Description

[0015] To better illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0016] Figure 1 This is a schematic diagram of the present application;

[0017] Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle;

[0018] Figure 3 These are the top view and sectional view of this application;

[0019] Figure 4 for Figure 3 Enlarged schematic diagram of part B;

[0020] Figure 5 A cross-sectional view of a double-acting cylinder used for the second cylinder;

[0021] Figure 6 for Figure 5 An enlarged schematic diagram of section C;

[0022] Figure 7 for Figure 5An enlarged schematic diagram of section D in the middle;

[0023] Figure 8 A cross-sectional view of the first and second cylinders using a double-acting cylinder.

[0024] In the picture,

[0025] 1. Frame; 1-1. Horizontal plate; 1-2. Vertical plate; 1a. Convex groove; 1a1. Second connecting surface;

[0026] 2. Mounting base; 2-1. Base body; 2-2. First part; 2-3. Second part; 2a. Half hole; 2a1. First connecting surface; 2b. Protrusion;

[0027] 3. First cylinder; 3a. Air passage;

[0028] 4. Second cylinder; 4a. Installation position; 4b. Wiring channel;

[0029] 5. Nuts;

[0030] 6. Bolts;

[0031] 7. Plug;

[0032] 8. Installation disk. Specific Implementation

[0033] The following description is provided in conjunction with the accompanying drawings, which are for illustrative purposes only and not strictly to scale. Unless otherwise defined, the technical or scientific terms used in this disclosure should be understood in their ordinary sense by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes. Unless otherwise specified, the embodiments in this application can be combined with each other.

[0034] Please see Figure 1 A tooling fixture for airtightness testing includes a frame 1, two mounting bases 2, a first cylinder 3, and a second cylinder 4.

[0035] The frame 1 is concave and includes a horizontal plate 1-1 and two vertical plates 1-2. More specifically, the bottom surface of the vertical plates 1-2 may have two threaded holes. Screws are used to pass through the horizontal plate 1-1 and threadedly connect to the vertical plates 1-2, forming the concave frame 1. For ease of explanation of the orientation later, the two vertical plates 1-2 are set to be opposite each other in a first horizontal direction, and the direction perpendicular to the first direction and horizontal is the second direction.

[0036] Please see Figure 1 , Figure 2 and Figure 6 Both mounting bases 2 are fixedly connected to the horizontal plate 1-1, and the fixed connection method can be similar to that of the vertical plate 1-2 and the horizontal plate 1-1. The top surface of the mounting base 2 has a stepped semi-hole 2a, and a first connecting surface 2a1 is formed between the larger and smaller parts of the semi-hole 2a. The semi-hole 2a is used to place the stepped end of the pipe fitting. More specifically, after the pipe fitting is placed in the two mounting bases, the shoulders at both ends abut against the first connecting surface 2a1 of the two mounting bases 2, respectively, restricting the movement of the pipe fitting in the first direction.

[0037] In some embodiments, both mounting bases 2 can be adjusted along the first direction to a fixed position on the horizontal plate 1-1.

[0038] Compared to the complete fixation between mounting base 2 and horizontal plate 1-1, this tooling fixture can be applied to pipes of different lengths within a certain range.

[0039] In some embodiments, the first adjustment method of the mounting base 2 may be: using screws through the mounting base 2; the horizontal plate 1-1 has multiple sets of threaded holes for screw thread connection.

[0040] Please see Figure 3 and Figure 4 In some embodiments, a second adjustment method for the mounting base 2 may be: the horizontal plate 1-1 has two convex grooves 1a corresponding to the position of the mounting base 2; each convex groove 1a has a nut 5 in the wider portion that restricts rotation, and square nuts 5 of equal width can be used; the bottom surface of each mounting base 2 has two protrusions 2b that enter the narrower portion of the convex groove 1a, and the two inner walls of the narrower portion that are opposite each other in the second direction are used for the protrusions 2b to fit, and the bottom surface of the protrusions 2b does not exceed the second connecting surface 1a1 where the narrower portion and the wider portion connect; a bolt 6 is used to pass through the mounting base 2 and is threaded to the nut 5. Tightening the bolt 6, i.e., using fasteners to fix the mounting base 2 and the horizontal plate 1-1, and loosening the bolt 6, allows the mounting base 2 to move relative to the horizontal plate 1-1 in the first direction to adjust its position.

[0041] Compared to the first adjustment method, the second adjustment method is simpler to operate, has a stepless adjustment range, and is better suited for pipe fittings.

[0042] Please see Figure 2 and Figure 4 In some embodiments, the mounting base 2 includes a base portion 2-1, a first portion 2-2, and a second portion 2-3. The base portion 2-1 is used to connect to the horizontal plate 1-1. The first portion 2-2 is used to accommodate the larger portion of the semi-hole 2a. The second portion 2-3 is used to accommodate the smaller portion of the semi-hole 2a. The second portion 2-3 is also used to connect the first portion 2-2 and the base portion 2-1. More specifically, the first portion 2-2 is placed on the base portion, and the second portion 2-3 is simultaneously attached to the vertical side of both the first portion 2-2 and the base portion. Two sets of screws are used to fix the second portion 2-3 to the base portion and the second portion 2-3 to the first portion 2-2, respectively.

[0043] In this way, multiple first parts 2-2 and second parts 2-3 of different sizes can be designed, combined, and installed onto the base.

[0044] Please see Figure 1 and Figure 2 The first cylinder 3 is fixedly connected to one of the vertical plates 1-2. A plug 7 is fixedly connected to the piston rod of the first cylinder 3. More specifically, a mounting plate 8 can be fixedly connected to the piston rod, and the plug 7 is adhesively fixed to the mounting plate 8. The plug 7 is used to block / open the corresponding end of the pipe fitting; that is, under the action of the first cylinder 3, the end face of the plug 7 is close to the pipe opening. A rubber block can be used as the plug 7, and through deformation, a tight fit with the pipe opening is ensured. The piston rod also has an air passage 3a, which allows the plug 7 to connect to the pipe fitting when the pipe opening is blocked. More specifically, the plug 7 is annular, one end of the mounting plate 8 has a first connecting section connected to the air passage 3a, and the other end has a second connecting section into which the plug 7 is inserted. The mounting plate 8 also has through holes penetrating the first and second connecting sections.

[0045] Please see Figure 2 and Figure 6 In some embodiments, the piston rod has a blind hole at its end, and a tracheal inlet connected to the rod wall via a threaded connection, the blind hole and the tracheal inlet forming an air passage 3a.

[0046] Please see Figure 8 In some embodiments, the first cylinder 3 is a double-acting cylinder, and the air passage 3a penetrates both ends of the piston rod. That is, the piston rod is provided with a through hole, one end of which is used for connection to the mounting plate 8, and the other end is connected to an air pipe connector. The through hole and the air pipe connector form the air passage 3a.

[0047] Please see Figure 3 , Figure 5 , Figure 6 and Figure 7The second cylinder 4 is fixedly connected to another vertical plate 1-2. A plug 7 is fixedly connected to the piston rod of the second cylinder 4, which is used to plug / unplug the corresponding end of the pipe fitting. The piston rod also has a mounting position 4a for mounting the measuring head. More specifically, referring to the design of the mounting plate 8 and air passage 3a on the first cylinder 3, the through hole on the mounting plate 8 is for mounting the measuring head, and the air passage 3a serves as a wire groove 4b for leading out the connecting wire of the measuring head. Preferably, referring to the configuration of the first cylinder 3 as a double-acting cylinder, the second cylinder 4 is also a double-acting cylinder, and the piston rod has a through hole, which serves as a wire groove 4b connecting the mounting position 4a.

[0048] An external vacuum pump is connected to air passage 3a, and a measuring head is installed at mounting position 4a. After the pipe is placed on the two mounting seats, the shoulders at both ends abut against the first connecting surfaces 2a1 of the two mounting seats 2, restricting the movement of the pipe in the first direction. The first cylinder 3 and the second cylinder 4 move simultaneously, the piston rods extend, and the two plugs 7 block the two openings of the pipe. Correspondingly, the first cylinder 3 and the second cylinder 4 can be controlled by the same set of air pumps and reversing valves. The vacuum pump evacuates air from inside the pipe, and the measuring head measures the air pressure inside the pipe. Based on the measured air pressure inside the pipe, the airtightness of the pipe is determined.

[0049] Please see Figure 2 In some embodiments, the outer edge of the plug 7 is beveled. This makes it easier for the plug 7 to fit tightly against the pipe opening.

Claims

1. A tooling fixture for airtightness testing, characterized in that, include: The frame (1) is concave and includes: a horizontal plate (1-1) and two vertical plates (1-2) opposite each other in the first direction; Two mounting bases (2) are fixedly connected to the horizontal plate (1-1); the top surface of the mounting base (2) has a stepped half hole (2a), which is used to place the stepped end of the pipe fitting. The first cylinder (3) is fixedly connected to one of the vertical plates (1-2); the piston rod is fixedly connected to a plug (7) for blocking / opening the pipe opening at the corresponding end of the pipe fitting; the piston rod also has an air passage (3a) that can connect the pipe fitting when the pipe opening is blocked. The second cylinder (4) is fixedly connected to another vertical plate (1-2), and the piston rod is fixedly connected to a plug (7) for blocking / releasing the pipe opening at the corresponding end of the pipe fitting; the piston rod also has an installation position (4a) for mounting the measuring head.

2. The tooling fixture for airtightness testing according to claim 1, characterized in that, Both mounting bases (2) can be adjusted along the first direction to a fixed position on the horizontal plate (1-1).

3. The tooling fixture for airtightness testing according to claim 1, characterized in that, The mounting base (2) includes: a base portion (2-1) for connecting with a horizontal plate (1-1), a first portion (2-2) for setting a larger portion of the semi-hole (2a), and a second portion (2-3) for setting a smaller portion of the semi-hole (2a); the second portion (2-3) connects the first portion (2-2) and the base portion (2-1).

4. The tooling fixture for airtightness testing according to claim 1, characterized in that, It also has at least one of the following settings: Setting 1: The first cylinder (3) is a double-acting cylinder, and the air passage (3a) penetrates both ends of the piston rod; Setting 2: The second cylinder (4) is a double-acting cylinder, and the piston rod has a groove (4b) that connects to the installation position (4a).

5. The tooling fixture for airtightness testing according to claim 1, characterized in that, The outer edge of the plug (7) is beveled.

6. The tooling fixture for airtightness testing according to claim 2, characterized in that, The horizontal plate (1-1) has two convex grooves (1a) corresponding to the position of each of the mounting seats (2); the wider part of each convex groove (1a) has a nut (5) that restricts rotation; the bottom surface of each mounting seat (2) has two protrusions (2b) that enter the narrower part of the convex groove (1a); each mounting seat (2) is also provided with a bolt (6) that matches the nut (5).

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