A test tool and test method for catheter axial crush connection force

Abstract

The application provides a testing tool and testing method for axial extrusion connection force of a conduit, and relates to the technical field of metal conduit connection, and comprises a base with a base limiting groove on an upper end face, an adjusting bolt, a pressure plate accommodated in the base limiting groove, a positioning ring axially inserted on an upper end face of the pressure plate, and a chuck and a pressure column accommodated in the positioning ring, and a part of the pressure column extends out of an upper end face of the positioning ring, the base has a base limiting boss, and an inner surface of the base limiting boss is provided with a thread, the pressure plate is provided with a positioning groove, and the positioning ring is provided with an observation viewport on a cylindrical side face. The tool is applied to an electronic universal testing machine, is suitable for axial extrusion pipe joints of different size specifications, provides the required extrusion force value for a connection tool of the pipe joint, realizes a leap from theory to reality research of domestic axial extrusion connection technology, and greatly promotes the research progress of the domestic pipe joint.

Description

Technical Field

[0001] This invention relates to the field of metal conduit connection technology, and in particular to a test tool for axial compression connection force of conduits and a test method using the tool. Background Technology

[0002] Axial extrusion technology is a novel conduit connection technology developed based on cold extrusion joining technology. This technology typically involves forcibly assembling an outer ring onto a pipe sleeve using specialized tools. Under a certain extrusion speed, the joint undergoes plastic deformation. Because the outer ring and pipe sleeve have an interference fit, the assembled pipe sleeve and conduit undergo elastic and plastic deformation, tightly bonding them together to form a connection. This connection technology generally requires no initial processing of the conduit before connection; it can be achieved simply by selecting appropriate connection equipment and fittings, and under normal environmental conditions. Axial extrusion pipe connections offer advantages such as light weight, simple structure, no need to control assembly torque, good assembly consistency, simple process, short processing time, and high efficiency, and are gradually becoming one of the main methods for pipe connection.

[0003] However, domestic research on axial extrusion pipe fittings is still in the theoretical stage. Further research requires actual production and testing. Therefore, the design of the extrusion connection tool for pipe fittings is crucial, and the most important factor is the extrusion force required during connection. Summary of the Invention

[0004] The technical problem this invention aims to solve is that the reliability of axially extruded pipe fittings is determined by both the fitting structure and the connection process. During the connection process, the deformation of the sleeve and conduit depends on the pressure output of the connecting tool. Excessive or inappropriate pressure output may reduce the sealing performance and fatigue life of the connecting components. The pressure output of the connecting tool is related to the axial connecting force during the pipe fitting connection process, but currently there is no research in China on the required axial connecting force value for axially extruded pipe fittings.

[0005] In view of this, the present invention provides a test tool for the axial compression connection force of a conduit.

[0006] This invention is achieved using the following technical solution:

[0007] A testing tool for axial compression connection force of a conduit includes a base with a base limiting groove on its upper end face, an adjusting bolt, a pressure plate housed in the base limiting groove, a positioning ring axially inserted into the upper end face of the pressure plate, and a clamping plate and a pressure post housed in the positioning ring, with a portion of the pressure post extending out of the upper end face of the positioning ring. The base has a base limiting boss, and the inner surface of the base limiting boss has threads. The pressure plate has a positioning groove. The positioning ring has an observation port on the cylindrical side. The clamping plate is composed of two semi-cylinders, each of which has a concave limiting groove and a convex limiting platform on its side end face.

[0008] In this invention, the base limiting groove is fitted with the pressure plate, and the base limiting boss is threadedly fitted with the adjusting bolt. By rotating the adjusting bolt, the position of the conduit in the base can be adjusted to meet the positioning requirements when the conduit is connected to the pipe fitting.

[0009] In this invention, the pressure plate has a pressure plate body, a positioning groove formed on the upper end face of the pressure plate body, and a clamping opening formed on the inner wall surface of the pressure plate body, wherein the diameter of the clamping opening matches the outer ring extrusion end of the outer ring.

[0010] In this invention, the clamping end diameter of the clamping disc matches the central groove of the sleeve, and the two semi-cylinders cooperate through a concave limiting groove and a convex limiting platform. The upper end of the clamping disc can extend into the positioning groove of the pressure column, and the lower end has the same diameter as the outer surface of the positioning groove. Under the restriction of the positioning ring, the sleeve can be pressed down vertically.

[0011] In this invention, the tool is suitable for connecting pipe fittings with a diameter of 4-20mm, and can be achieved simply by replacing the pressure plate and clamping plate corresponding to the pipe fitting.

[0012] In this invention, the base limiting boss is embedded in the lower interface of the electronic universal testing machine, the upper plane of the testing machine contacts the connecting end of the pressure column, and the axial extrusion connection force is the axial force required to force the outer ring to be assembled onto the pipe sleeve when the axial extrusion pipe joint is connected. The axial connection is completed on the electronic universal testing machine by the fixture, and the value of the axial extrusion connection force can be output.

[0013] This invention also includes a method for testing the axial compression connection force of a conduit, the specific test steps of which are as follows:

[0014] Step 1: Place the pressure plate into the limiting groove of the base, place the outer ring extrusion end downward into the clamping port of the pressure plate, and insert the guide tube through the inside of the outer ring into the base. Rotate the adjusting bolt until the guide tube meets the positioning requirements.

[0015] Step 2: Place the positioning ring on the pressure plate, rotate the positioning ring until the inside can be seen through the observation port, put the clamp that fixes the tube sleeve into the positioning ring, and use gravity to make the tube sleeve and the outer ring form a pre-connection.

[0016] Step 3: Place the positioning groove of the pressure column into the positioning ring, mate it with the main body of the clamping plate, adjust the pressure column to ensure that the sleeve, outer ring and guide tube are on the same axis, start the electronic universal testing machine, press the pressure column vertically down, observe the sight glass through the positioning ring to judge the connection status until the axial connection is completed, and obtain the value of the axial compressive force.

[0017] Step 4: After the connection is completed, first remove the pressure column and positioning ring, then separate the clamping plate, and finally take out the connecting pipe fitting and inspect it. If the outer ring has been fully assembled onto the pipe sleeve, the axial compressive force value is valid.

[0018] The present invention has the following advantages: This set of fixtures is applied to electronic universal testing machines and is suitable for axial extrusion pipe fittings of different sizes and specifications. It provides the required extrusion force value for the connection tools of pipe fittings, realizes the leap from theoretical to practical research of domestic axial extrusion connection technology, and greatly promotes the research progress of such pipe fittings in China. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the tool for measuring axial compression connection force according to the present invention;

[0020] Figure 2 This is a schematic diagram of the pressure plate of the present invention;

[0021] Figure 3 This is a partial cross-sectional schematic diagram of the positioning ring of the present invention;

[0022] Figure 4 This is a schematic diagram of the clamping plate of the present invention, wherein (a) is a front view of the clamping plate and (b) is a right view of the clamping plate;

[0023] Figure 5 This is a schematic diagram of the pipe connector structure of the present invention;

[0024] In the diagram, 1. Base; 101. Base limiting groove; 102. Base limiting boss; 103. Base body; 2. Pressure plate; 201. Positioning groove; 202. Clamping port; 203. Pressure plate body; 3. Positioning ring; 301. Observation port; 302. Positioning boss; 303. Positioning ring body; 4. Clamping plate; 401. Concave limiting groove; 402. Convex limiting platform; 403. Clamping end; 404. Clamping plate body; 405. Clamping plate positioning cylinder; 5. Pressure column; 501. Pressure column positioning groove; 502. Pressure column connecting end; 6. Adjusting bolt; 7. Pipe joint; 8. Pipe sleeve; 801. Central groove; 9. Outer ring; 901. Outer ring extrusion end; 902. Outer ring positioning end; 10. Conduit. Detailed Implementation

[0025] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0026] Figure 1 A schematic diagram of a tool for measuring axial compression connection force is shown. The tool for testing the axial compression connection force of a conduit includes a base 1 with a base limiting groove 101 on its upper end face, an adjusting bolt 6, a pressure plate 2 housed in the base limiting groove 101, a positioning ring 3 axially inserted into the upper end face of the pressure plate 2, a clamping plate 4 housed in the positioning ring 3, and a pressure post 5. A portion of the pressure post 5 extends beyond the upper end face of the positioning ring 3, and the length of the portion of the pressure post 5 extending beyond the upper end face of the positioning ring 3 is greater than the length required for assembly between the tube sleeve and the outer ring. The pressure post 5 has a pressure post connecting end 502 and a pressure post positioning groove 501 formed on the lower end face of the pressure post connecting end 502.

[0027] The base 1 has a base body 103, a base limiting groove 101 formed on the upper end face of the base body 103, and a base limiting boss 102 integrally formed on the lower end face of the base body 103. The inner surface of the base limiting boss 102 has threads. The base limiting boss 102 and the adjusting bolt 6 are threaded together. By rotating the adjusting bolt 6, the position of the conduit 10 in the base 1 can be adjusted to meet the positioning requirements when the conduit 10 is connected to the pipe connector 7. The base limiting groove 101 is transitionally fitted with the pressure plate 2.

[0028] Figure 2 A schematic diagram of the pressure plate is shown. The pressure plate 2 has a pressure plate body 203, a positioning groove 201 formed on the upper end face of the pressure plate body 203, and a clamping opening 202 formed on the inner wall of the pressure plate body 203. The positioning groove 201 is an annular groove, and the diameter of the clamping opening 202 matches the outer ring extrusion end 901 of the outer ring 9.

[0029] Figure 3 A schematic diagram of the positioning ring is shown. The positioning ring 3 has a positioning ring body 303. The positioning ring 3 has an observation port 301 on the cylindrical side. The lower end face of the positioning ring body 303 is integrally formed with a positioning boss 302. The positioning boss 302 can be fixed in the positioning groove 201 of the pressure plate 2 to limit the radial position of the positioning ring 3.

[0030] Figure 4A schematic diagram of the clamping plate is shown. The clamping plate 4 has a clamping plate body 404, a clamping plate positioning cylinder 405 integrally formed with the lower end face of the clamping plate body 404, and a clamping end 403 integrally formed with the inner wall surface of the clamping plate positioning cylinder 405. The clamping plate 4 is composed of two semi-cylinders. Each semi-cylinder has a concave limiting groove 401 and a convex limiting platform 402 on its front and rear sides, respectively. The concave limiting groove 401 of one semi-cylinder cooperates with the convex limiting platform 402 of the other semi-cylinder. The two semi-cylinders are connected into a whole by cooperating with the concave limiting groove 401 and the convex limiting platform 402. The diameter of the clamping end 403 is matched with the central groove 801 of the tube sleeve 8. The clamping plate body 404 can extend into the pressure column positioning groove 501 of the pressure column 5. The outer surface diameter of the clamping plate positioning cylinder 405 is the same as that of the pressure column positioning groove 501. Under the restriction of the positioning ring 3, the tube sleeve 8 can be pressed down vertically.

[0031] Figure 5 A schematic diagram of the pipe fitting structure is shown. The tool for testing the axial compression connection force of the conduit is suitable for connecting pipe fittings with a diameter of 4-20mm to the conduit 10. It can be achieved simply by replacing the pressure plate 2 and clamping plate 4 corresponding to the pipe fitting 7.

[0032] The base limiting boss 101 is embedded in the lower interface of the electronic universal testing machine, and the upper plane of the testing machine contacts the pressure column connection end 502.

[0033] The axial compression connection force is the axial force required to force the outer ring 9 to be assembled onto the sleeve 8 when the axial compression pipe fitting 7 is connected. The axial connection is completed on an electronic universal testing machine using tools, and the value of the axial compression connection force can be output.

[0034] The specific testing steps are as follows:

[0035] Step 1: Place the pressure plate 2 into the base limiting groove 101, and place the outer ring extrusion end 901 downward into the pressure plate clamping port 202. The guide tube passes through the inside of the outer ring 9 and is placed into the base 1. Rotate the adjusting bolt 6 until the guide tube meets the positioning requirements.

[0036] Step 2: Place the positioning ring 3 on the pressure plate 2, rotate the positioning ring 3 until the inside can be seen through the observation port 301, put the clamp 4 that fixes the tube sleeve 8 into the positioning ring 3, and use gravity to make the tube sleeve 8 and the outer ring 9 form a pre-connection.

[0037] Step 3: Place the positioning groove 501 of the pressure column into the positioning ring 3 and mate it with the main body 404 of the clamping plate. Adjust the pressure column 5 to ensure that the sleeve 8, outer ring 9 and guide tube are on the same axis. Then start the electronic universal testing machine to press the pressure column 5 vertically down. Observe the sight glass 301 through the positioning ring to judge the connection until the axial connection is completed and obtain the value of the axial compressive force.

[0038] Step 4: After the connection is completed, first remove the pressure column 5 and the positioning ring 3, then separate the clamping plate 4, and finally take out the connecting pipe and check it. If the outer ring 9 has been fully assembled onto the pipe sleeve 8, then the axial compressive force value is valid.

Claims

1. A test method for a test tool applying the axial compression connection force of a conduit, characterized in that: The specific testing steps are as follows: Step 1: Place the pressure plate into the limiting groove of the base, put the outer ring extrusion end downward into the pressure plate clamping port, and insert the guide tube through the inside of the outer ring into the base. Rotate the adjusting bolt until the guide tube meets the positioning requirements. Step 2: Place the positioning ring on the pressure plate, rotate the positioning ring until the inside can be seen through the observation port, put the clamp that fixes the tube sleeve into the positioning ring, and use gravity to make the tube sleeve and the outer ring form a pre-connection. Step 3: Place the positioning groove of the pressure column into the positioning ring, mate it with the main body of the clamping plate, adjust the pressure column to ensure that the sleeve, outer ring and guide tube are on the same axis, start the electronic universal testing machine, press the pressure column vertically down, observe the sight glass through the positioning ring to judge the connection status until the axial connection is completed, and obtain the value of the axial compressive force. Step 4: After the connection is completed, first remove the pressure column and positioning ring, then separate the clamping plate, and finally take out the connecting pipe fitting and inspect it. If the outer ring has been fully assembled onto the pipe sleeve, the axial compressive force value is valid. The test tool for the axial compression connection force of the conduit includes a base with a base limiting groove on the upper end face, an adjusting bolt, a pressure plate housed in the base limiting groove, a positioning ring axially inserted into the upper end face of the pressure plate, and a clamping plate and a pressure column housed in the positioning ring, with a portion of the pressure column extending out of the upper end face of the positioning ring. The base has a base limiting boss, and the inner surface of the base limiting boss has threads. The pressure plate has a positioning groove. The positioning ring has an observation port on the cylindrical side. The clamping plate is composed of two semi-cylinders, each of which has a concave limiting groove and a convex limiting platform on its side end face. The base limiting boss and the adjusting bolt are threaded together. The clamping opening diameter of the pressure plate matches the extrusion end of the outer ring; The clamping end diameter of the clamping plate matches the central groove of the sleeve. The two semi-cylinders cooperate through the concave limiting groove and the convex limiting platform. The upper end of the clamping plate can extend into the positioning groove of the pressure column, and the lower end has the same diameter as the outer surface of the positioning groove of the pressure column. Under the restriction of the positioning ring, the sleeve can be pressed down vertically.

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