A pressure transmitter test tool

Abstract

The utility model relates to a pressure transmitter testing tool, comprising: a limiting tool, which is a hollow cylindrical structure as a whole; a first opening end for one end of the pressure transmitter to extend into the interior thereof, a limiting portion located at the first opening end and used for limiting the pressure transmitter from detaching from the limiting tool through the first opening end after one end of the pressure transmitter extends into the limiting tool and rotates a certain angle relative to the limiting tool, and a second opening end; a top block, at least partially coaxially embedded in the limiting tool via the second opening end; a gas source channel, the gas outlet end of the gas source channel is located at the end of the top block, and a sealing ring is provided at the end of the gas outlet end; when the pressure transmitter is limited by the limiting portion, the gas inlet end of the pressure transmitter is pressed against the sealing ring, and the gas inlet of the pressure transmitter is directly opposite to the gas outlet end of the gas source channel; the present application can be adapted to the air tightness detection of pressure transmitters of various thread models, and has high adaptability.

Description

Technical Field

[0001] The utility model relates to a pressure transmitter testing tool, which is mainly used in the technical field of pressure transmitter testing. Background Art

[0002] like Figure 1-Figure 3 As shown, in the prior art, the test of the pressure transmitter product is to use the threaded end on the pressure transmitter product to directly screw the pressure transmitter product 101 into the threaded hole reserved on the test fixture 102, and the pressure transmitter product 101 and the test fixture 102 are sealed with an O-ring 103, and the pressure transmitter product 101 is ventilated through the air duct 104 on the test fixture 102 to achieve air tightness and other tests.

[0003] The disadvantage is that the thread specifications of the threaded ends of pressure transmitters of different specifications and models also vary, and it is necessary to make adapters with corresponding threads for installation to adapt to the threaded holes on the test fixture, or to replace the test fixture with an adapted model for testing. That is, the product has poor applicability. Summary of the invention

[0004] The purpose of the utility model is to provide a pressure transmitter testing tool with better applicability in view of the above-mentioned problems.

[0005] In order to achieve the above object, the utility model is implemented through the following technical solutions:

[0006] A pressure transmitter testing fixture comprises: a limiting fixture, which is a hollow cylindrical structure as a whole; having a first opening end for one end of the pressure transmitter to extend into its interior, a limiting portion located at the first opening end and used to limit the pressure transmitter from detaching from the limiting fixture through the first opening end after one end of the pressure transmitter extends into the limiting fixture and rotates a certain angle relative to the limiting fixture, and a second opening end; a top block, at least partially coaxially embedded in the limiting fixture through the second opening end; having an air source channel, the air inlet end of the air source channel is used to connect to an external air source, the air outlet end of the air source channel is located at the end of the top block, and a sealing ring is provided at the end of the air outlet end; when the pressure transmitter is limited by the limiting portion, the air inlet end of the pressure transmitter is pressed against the sealing ring, and the air inlet of the pressure transmitter is directly opposite to the air outlet end of the air source channel.

[0007] Preferably, the test fixture also includes: a limit block, which is a hollow cylindrical structure as a whole and is coaxially installed in the limit fixture, with its upper end abutting against the limit part, and can follow the pressure transmitter to rotate between a first position and a second position relative to the limit fixture after one end of the pressure transmitter is inserted into the limit fixture; when the limit block is in the first position, one end of the pressure transmitter with the hexagonal joint can extend into the limit block through the first opening end; when the limit block is in the second position, the end of the hexagonal joint of the pressure transmitter abuts against the limit part, limiting the pressure transmitter from detaching from the limit fixture through the first opening end.

[0008] Preferably, the cross section of the first open end is a regular hexagon that matches the hexagonal joint of the pressure transmitter, and the cross section of the hollow portion of the limit block is a regular hexagon that matches the hexagonal joint of the pressure transmitter.

[0009] Preferably, at least two mounting holes are radially opened on the limiting tooling, and an elastic limiting component is arranged in each mounting hole; and a plurality of limiting grooves cooperating with the elastic limiting components are arranged on the limiting block.

[0010] Preferably, the elastic limiting assembly includes: a limiting spring, which is arranged in the mounting hole; a limiting ball, which is arranged in the mounting hole and is located at one end of the limiting spring facing the axis of the limiting tooling; and is used to be embedded in the limiting groove under the action of the limiting spring to realize the relative positioning of the limiting tooling and the limiting block.

[0011] Preferably, the elastic limiting assembly further comprises: a limiting screw, which is threadedly connected to the mounting hole and is located at an end of the limiting spring away from the axis of the limiting tooling; the mounting hole is a through hole that penetrates the side wall of the limiting tooling.

[0012] Preferably, the test fixture further comprises: a support spring, two ends of which respectively abut against the top block and the limit block, so that the upper end of the limit block abuts against the limit portion.

[0013] Preferably, the test fixture further comprises: a substrate with a through hole; the limiting fixture is mounted on the substrate, and the top block is at least partially coaxially embedded in the limiting fixture through the second opening end after passing through the through hole.

[0014] Preferably, the test fixture also includes: a driving mechanism, which is installed on the base plate away from the limiting fixture through a plurality of support columns; a connecting rod, one end of which is connected to the output end of the driving mechanism and the other end is connected to the top block, for driving the top block to reciprocate along its axis relative to the limiting fixture.

[0015] Preferably, the driving mechanism is a cylinder.

[0016] The beneficial effects of the utility model are:

[0017] 1. The tooling in the prior art cannot adapt to products with various thread models. When testing products of different models, different adapters need to be installed or test tooling of suitable models need to be replaced, which affects production efficiency and increases production costs. The first opening end of the limit tooling can allow pressure transmitters of various models to enter the interior of its cylindrical structure, and the end of the pressure transmitter extending into the limit tooling can be limited through the cooperation of the limit part and the top block (it will not detach from the limit tooling through the first opening end). In this process, there are no additional requirements for the thread model of the threaded end on the pressure transmitter. Therefore, it can be adapted to the air tightness detection of pressure transmitters of various thread models, with high adaptability, reducing the trouble of frequent tooling changes due to product changes, and no need to equip each specific product with specific tooling, which saves tooling preparation time and helps to quickly switch production tasks.

[0018] 2. Compared with the manual tightening method adopted in the prior art, the test fixture only requires the staff to insert the pressure transmitter into the cylindrical structure of the limit fixture, rotate the pressure transmitter to a certain angle, and then cooperate with the limit part and the top block to achieve fixed limit of the pressure transmitter. The operation process only requires two steps of insertion and slight rotation, which improves the ease of operation and further improves production efficiency and staff satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structure of the test fixture of the pressure transmitter in the prior art is shown in FIG. Figure 1 .

[0020] Figure 2 The structure of the test fixture of the pressure transmitter in the prior art is shown in FIG. Figure 2 .

[0021] Figure 3 The structure of the test fixture of the pressure transmitter in the prior art is shown in FIG. Figure 3 .

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the utility model.

[0023] Figure 5 This is a vertical cross-sectional schematic diagram of the pressure transmitter of the utility model after the limit fixture is inserted;

[0024] Figure 6 for Figure 5 A partial enlarged view of the middle part;

[0025] Figure 7 It is a partial plane cross-sectional view of the pressure transmitter of the utility model after the limit fixture is inserted;

[0026] Figure 8 It is a vertical cross-sectional schematic diagram of the hexagonal joint of the pressure transmitter of the utility model against the limiting part;

[0027] Fig. 9 It is a partial planar cross-sectional view of the hexagonal joint of the pressure transmitter of the utility model against the limiting part;

[0028] Fig.10 It is an exploded view of the pressure transmitter, the limit fixture and the limit block of the utility model;

[0029] Fig.11 It is an exploded view of the top block and the base plate of the utility model;

[0030] Fig.12 It is an exploded view of the top block and the driving mechanism of the utility model.

[0031] In the figure, 1-limiting tool; 11-first opening end; 12-limiting part; 13-second opening end; 14-mounting hole; 15-elastic limiting assembly; 151-limiting spring; 152-limiting ball; 153-limiting screw; 2-top block; 21-air source channel; 22-sealing ring; 3-limiting block; 31-limiting groove; 4-support spring; 5-base plate; 51-through hole; 52-support column; 6-driving mechanism; 7-connecting rod; 8-pressure transmitter; 101-pressure transmitter product; 102-test tool; 103-O-ring; 104-air channel. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the following will be described clearly and completely in combination with the technical solution in the embodiments of the utility model. Obviously, the described embodiments are partial embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0033] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] refer to Figures 4 to 12As shown, a pressure transmitter test fixture comprises: a limit fixture 1, which is a hollow cylindrical structure as a whole; a first opening end 11 for one end of the pressure transmitter 8 to extend into the interior thereof, a limit portion 12 located at the first opening end 11 and used to limit the pressure transmitter 8 from being separated from the limit fixture 1 through the first opening end 11 after one end of the pressure transmitter 8 extends into the limit fixture 1 and rotates a certain angle relative to the limit fixture 1, and a second opening end 13; a top block 2, at least part of which The pressure transmitter 8 is coaxially embedded in the limiting tool 1 through the second opening end 13; it has an air source channel 21, the air inlet end of the air source channel 21 is used to connect with an external air source, the air outlet end of the air source channel 21 is located at the end of the top block 2, and a sealing ring 22 is provided at the end of the air outlet end; when the pressure transmitter 8 is limited by the limiting part 12, the air inlet end of the pressure transmitter 8 is pressed against the sealing ring 22, and the air inlet of the pressure transmitter 8 is opposite to the air outlet end of the air source channel 21.

[0035] In actual use, the pressure transmitter 8 to be tested is fed or inserted into the interior of the limiting tool 1 from the first opening end 11 (such as Figures 5 to 7 As shown), and the pressure transmitter 8 is rotated at a certain angle so that the end of the pressure transmitter 8 extending into the limiting fixture 1 can be limited and will not be separated from the limiting fixture 1 through the first opening end 11 (for example, as Figure 8 , Fig. 9 As shown, the hexagonal joint of the pressure transmitter 8 is used to abut against the limit portion 12 to prevent the pressure transmitter 8 from detaching from the limit fixture 1 through the first opening end 11); at this time, the air inlet end of the pressure transmitter 8 is pressed against the sealing ring 22, and the air inlet of the pressure transmitter 8 is opposite to the air outlet end of the air source channel 21. By controlling the air supply from the external air source, the pressure transmitter 8 can be tested.

[0036] In this way, the test tooling in the prior art cannot adapt to products of various thread models. When testing products of different models, it is necessary to install different adapters or replace the tooling of the corresponding model, which affects production efficiency and increases production costs. The first open end 11 of the limit tooling 1 of the present embodiment can allow various types of pressure transmitters 8 to enter the interior of its cylindrical structure, and the hexagonal joint of the pressure transmitter 8 is pressed against the limit part 12 by the cooperation of the limit part 12 and the top block 2 to achieve fixed limit of the pressure transmitter 8. In this process, there are no additional requirements for the thread model of the threaded end on the pressure transmitter 8. Therefore, it can be adapted to the air tightness detection of pressure transmitters 8 of various thread models, with high adaptability, reducing the trouble of frequent replacement of tooling due to product changes, and no need to equip each specific product with specific tooling, which saves tooling preparation time and helps to quickly switch production tasks. In addition, compared with the prior art that adopts the manual tightening method, the test tool only requires the staff to insert the pressure transmitter 8 into the cylindrical structure of the limit tool 1, and rotate the pressure transmitter 8 to a certain angle and then cooperate with the limit part 12 and the top block 2 to achieve fixed limit of the pressure transmitter 8. The operation process only requires two steps of insertion and slight rotation, which improves the ease of operation and further improves production efficiency and staff satisfaction.

[0037] refer to Figure 4 , Figure 5 , Fig.11 , Fig.12 As shown, in some practical applications, the test fixture also includes: a substrate 5 (used to support the entire test fixture), with a through hole 51; a limiting fixture 1 is installed on the substrate 5, and the top block 2 passes through the through hole 51 and is at least partially coaxially embedded in the limiting fixture 1 through the second open end 13; a driving mechanism 6 is installed on the substrate 5 away from the limiting fixture 1 through a plurality of supporting columns 52; a connecting rod 7, one end of which is connected to the output end of the driving mechanism 6, and the other end is connected to the top block 2, and the driving mechanism 6 is used to drive the top block 2 to reciprocate along its axis relative to the limiting fixture 1, thereby realizing the movement of the top block 2 by external force. The pressure transmitter 8 is moved so that the hexagonal joint of the pressure transmitter 8 is pressed against the limit portion 12 to limit the pressure transmitter 8. During the entire operation, only two manual operation steps are required, namely, the staff inserts and slightly rotates the pressure transmitter 8. It should be noted that the driving mechanism 6 is a linear driving source that can be linearly extended and retracted. In actual production, a linear cylinder is often used to drive the reciprocating motion of the top block 2, which has a relatively low cost. In addition, the driving force of the linear cylinder can be adjusted by controlling the size of the air pressure, so that the hexagonal joint end of the pressure transmitter 8 is pressed against the limit portion 12 in a relatively gentle manner to avoid squeezing and deformation of the pressure transmitter 8.

[0038] refer to Figure 5-Figure 10As shown, in some practical applications, in order to prevent the different types of pressure transmitters 8 from shaking after being inserted into the limiting fixture 1, so that the air inlet cannot face the air outlet of the air source channel 21, a limiting block 3 is provided, which is a hollow cylindrical structure as a whole, is coaxially installed in the limiting fixture 1, and its upper end abuts against the limiting portion 12, and can follow the pressure transmitter 8 to rotate between the first position and the second position relative to the limiting fixture 1 after one end of the pressure transmitter 8 extends into the limiting fixture 1. In some implementations, a support spring 4 is provided, and its two ends abut against the top block 2 and the limiting block 3, respectively, so that the upper end of the limiting block 3 abuts against the limiting portion 12.

[0039] In this embodiment, when the limit block 3 is in the first position, the end of the pressure transmitter 8 with the hexagonal joint can extend into the limit block 3 through the first open end 11 for preliminary limiting, thereby preventing the pressure transmitter 8 from shifting and shaking; when the limit block 3 is in the second position, that is, after rotating the pressure transmitter 8 by a certain angle, the end of the hexagonal joint of the pressure transmitter 8 abuts against the limiting portion 12, thereby limiting the pressure transmitter 8 from detaching from the limiting fixture 1 through the first open end 11. Specifically, on the basis of the above, the cross-section of the first opening end 11 is a regular hexagon that is compatible with the hexagonal joint of the pressure transmitter 8, and the cross-section of the hollow part of the limit block 3 is a regular hexagon that is compatible with the hexagonal joint of the pressure transmitter 8. By making the hexagonal joints of different types of pressure transmitters 8 the same, the test tool can be adapted to various types of pressure transmitters 8. It should be noted that the cross-sections of the hollow part of the limit block 3 and the first opening end 11 are not limited to regular hexagons, and can be appropriately changed according to the shape change of the hexagonal joint of the pressure transmitter 8.

[0040] In other practical applications, such as Figure 5 , Figure 6 and Figure 8 As shown, at least two mounting holes 14 are radially opened on the limiting tool 1, and an elastic limiting component 15 is provided in each mounting hole 14; a plurality of limiting grooves 31 cooperating with the elastic limiting component 15 are provided on the limiting block 3, and through the cooperation between the elastic limiting component 15 and the limiting groove 31, the rotation angle of the pressure transmitter 8 can be limited when the pressure transmitter 8 is inserted into the limiting block 3 and rotated, so as to ensure that the hexagonal joint of the pressure transmitter 8 can just abut against the limiting portion 12.

[0041] One implementation method of the elastic limiting component 15:

[0042] The elastic limiting assembly 15 includes: a limiting spring 151, which is arranged in the mounting hole 14; a limiting ball 152, which is arranged in the mounting hole 14 and is located at one end of the limiting spring 151 facing the axis of the limiting tool 1; and is used to be embedded in the limiting groove 31 under the action of the limiting spring 151 to realize the relative positioning of the limiting tool 1 and the limiting block 3, that is, the diameter of the limiting ball 152 should be larger than the maximum width of the limiting groove 31 to avoid the limiting ball 152 being completely embedded in the limiting groove 31.

[0043] The elastic limiting assembly 15 further includes: a limiting screw 153, which is threadedly connected to the mounting hole 14 and is located at the end of the limiting spring 151 away from the axis of the limiting fixture 1; the mounting hole 14 is a through hole that penetrates the side wall of the limiting fixture 1. In this way, the force of the limiting spring 151 on the limiting ball 152 can be adjusted by rotating the limiting screw 153.

[0044] In this embodiment, before the pressure transmitter 8 is installed on the limiting tool 1, the limiting ball 152 should be embedded in one of the limiting grooves 31. At this time, the hexagonal shape of the first opening end 11 corresponds to the hexagonal shape of the hollow part of the limiting block 3, so that the pressure transmitter 8 can be smoothly inserted into the limiting block 3. Then, rotating the pressure transmitter 8 can drive the limiting block 3 to rotate together, and the limiting ball 152 disengages from one of the limiting grooves 31 and moves into another limiting groove 31 to achieve positioning. At this time, in conjunction with the push of the linear cylinder on the top block 2, the hexagonal joint of the pressure transmitter 8 can be pressed against the limiting part 12 to achieve fixed positioning of the pressure transmitter 8.

[0045] When the pressure transmitter 8 is actually installed, after the hexagonal joint of the pressure transmitter 8 enters the interior of the limit block 3, it can still slide up and down inside the limit block 3. When the pressure transmitter 8 rotates a certain angle so that the limit ball 152 enters another limit groove 31 to achieve positioning, there is still a certain gap between the air inlet of the pressure transmitter and the air outlet end of the air source channel 21. In this case, the staff can have at least two operating methods:

[0046] First, the staff releases the pressure transmitter 8, which can be pressed against the outlet end of the gas source channel 21 under the action of gravity. Then, the linear cylinder pushes the top block 2, which can drive the pressure transmitter to move upward as a whole and make its hexagonal joint press against the limit part 12, so as to fix the pressure transmitter. It should be noted that during the pushing process of the top block 2, the support spring 4 is compressed;

[0047] Secondly, the staff still holds the pressure transmitter 8 and pushes the top block 2 upward with the linear cylinder to reduce the gap between the pressure transmitter and the gas source channel 21 until the gap disappears and the gas outlet end of the pressure transmitter rests on the sealing ring to ensure the sealing between the gas source channel 21. The linear cylinder continues to push the top block 2, which will cause the hexagonal joint of the pressure transmitter 8 to rest on the limit portion 12, fixing the pressure transmitter up and down. During this process, the support spring 4 is also continuously compressed, which can give the limit block 3 a stronger elastic force to ensure that it stably rests on the limit portion 12.

[0048] In the above description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed above.

[0049] In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

Claims

1. A pressure transmitter test fixture, characterized in that: include: The limiting fixture (1) is in the form of a hollow cylindrical structure as a whole; it comprises a first opening end (11) for one end of the pressure transmitter to extend into the interior thereof, a limiting portion (12) located at the first opening end (11) and used to limit the pressure transmitter from being separated from the limiting fixture (1) through the first opening end (11) after the one end of the pressure transmitter extends into the limiting fixture (1) and rotates a certain angle relative to the limiting fixture (1); and a second opening end (13); The top block (2) is at least partially coaxially embedded in the position limiting tool (1) via the second opening end (13); it has an air source channel (21), the air inlet end of the air source channel is used to connect to an external air source, the air outlet end of the air source channel is located at the end of the top block (2), and a sealing ring (22) is provided at the end of the air outlet end; When the pressure transmitter is limited by the limiting portion (12), the air inlet end of the pressure transmitter is pressed tightly against the sealing ring (22), and the air inlet of the pressure transmitter faces the air outlet end of the air source channel (21).

2. The pressure transmitter test fixture according to claim 1, characterized in that: The test tool also includes: The limit block (3) is in the form of a hollow cylindrical structure as a whole and is coaxially mounted in the limit fixture (1). Its upper end abuts against the limit portion (12) and can rotate relative to the limit fixture (1) between a first position and a second position following the pressure transmitter after one end of the pressure transmitter extends into the limit fixture (1). When the limit block (3) is in the first position, one end of the pressure transmitter with the hexagonal joint can extend into the limit block (3) through the first opening end (11); when the limit block (3) is in the second position, the end of the hexagonal joint of the pressure transmitter abuts against the limit portion (12), limiting the pressure transmitter from detaching from the limit fixture (1) through the first opening end (11).

3. The pressure transmitter test fixture according to claim 2, characterized in that: The cross section of the first open end (11) is a regular hexagon that matches the hexagonal joint of the pressure transmitter, and the cross section of the hollow part of the limit block (3) is a regular hexagon that matches the hexagonal joint of the pressure transmitter.

4. The pressure transmitter test fixture according to claim 2, characterized in that: At least two mounting holes (14) are radially provided on the limiting tool (1), and an elastic limiting component (15) is provided in each mounting hole (14); and a plurality of limiting grooves (31) cooperating with the elastic limiting components (15) are provided on the limiting block (3).

5. The pressure transmitter testing tool according to claim 4, characterized in that: The elastic limiting component (15) comprises: A limit spring (151) is arranged in the mounting hole (14); The limiting ball (152) is arranged in the mounting hole (14) and is located at one end of the limiting spring (151) facing the axis of the limiting fixture (1); and is used to be embedded in the limiting groove (31) under the action of the limiting spring (151) to achieve relative positioning of the limiting fixture (1) and the limiting block (3).

6. The pressure transmitter testing tool according to claim 5, characterized in that: The elastic limiting component (15) further comprises: A limit screw (153) is threadedly connected to the mounting hole (14) and is located at an end of the limit spring (151) away from the axis of the limit fixture (1); The mounting hole (14) is a through hole that penetrates the side wall of the limiting tool (1).

7. The pressure transmitter testing tool according to claim 2, characterized in that: The test tool also includes: The two ends of the support spring (4) respectively abut against the top block (2) and the limit block (3), so that the upper end of the limit block (3) abuts against the limit portion (12).

8. The pressure transmitter testing tool according to claim 1, characterized in that: The test tool also includes: A base plate (5) is provided with a through hole; the position limiting fixture (1) is mounted on the base plate, and the top block (2) passes through the through hole and is at least partially coaxially embedded in the position limiting fixture (1) via the second opening end (13).

9. The pressure transmitter testing tool according to claim 8, characterized in that: The test tool also includes: A driving mechanism (6) is mounted on a side of the base plate (5) away from the limiting tool (1) via a plurality of supporting columns; A connecting rod (7) has one end connected to the output end of the driving mechanism (6) and the other end connected to the top block (2), and is used to drive the top block (2) to reciprocate along its axis relative to the limiting tooling (1).

10. The pressure transmitter testing tool according to claim 9, characterized in that: The driving mechanism (6) is a cylinder.

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