Disc spring mechanical curve testing structure

Abstract

The invention discloses a disc spring mechanical curve testing structure which is applied to a tension and compression testing machine, the tension and compression testing machine comprises a pressing block capable of moving up and down, the tension and compression testing machine can detect the displacement of the pressing block and the pressure applied outwards by the pressing block, and the disc spring mechanical curve testing structure comprises a structure base, a central column and a pressing part. The structural base is of a hollow cavity structure with at least the upper end open. The center column is of a hollow cavity structure with at least the upper end open, the center column is coaxially fixed into the structure base, a first mounting groove is formed in the edge of the top end of the center column in the circumferential direction of the center column, and the inner ring of the disc spring can be sleeved with the first mounting groove. The downward pressing part comprises a downward pressing column and a downward pressing cover, and the top end of the downward pressing column is connected to the bottom end of the pressing block. According to the invention, the accuracy of a disc spring pressure test curve tested by the tension and compression testing machine is improved, and the problem that the disc spring pressure test curve is inaccurate due to the use of a spherical loading pressure head in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of testing equipment, in particular to a disc spring mechanical curve testing structure. BACKGROUND

[0002] At present, the disc spring mechanical property test is usually carried out by using a microcomputer-controlled electronic universal testing machine in cooperation with a special tooling. Figure 1 As shown in the figure, the tooling includes a spherical loading indenter, a supporting circular table and an inner guide column. During the test, the lower end of the testing machine is fixed, and the upper end applies static load in a displacement control mode, and the loading speed is usually 1 mm / min. The small end of the disc spring is in contact with the spherical indenter, and the large end is in contact with the supporting circular table, and the inner guide column passes through the inner hole of the disc spring to play a guiding and anti-skid role. When pre-pressed to 1 mm (flat) or 2 mm (turned over), the testing machine collects displacement and force data, and draws a force-displacement curve to evaluate the elastic properties of the disc spring.

[0003] During the compression process, friction force is generated between the outer edge of the disc spring and the supporting circular table, which will undoubtedly interfere with the force measurement and affect the accuracy of the curve. Secondly, when the disc spring is turned over and deformed, the stress position changes from the contact between the outer edge and the supporting circular table to the contact between the edge of the groove and the edge of the groove, which causes the stress state to change suddenly, further introducing measurement error. In addition, the traditional sliding guide structure relies on lubrication, and the thickness change of the oil film may cause the stiffness data to drift, which cannot truly reflect the performance of the disc spring at high and low temperatures or after long-term use.

[0004] Therefore, there is a need for a new technical solution. SUMMARY

[0005] Therefore, the present application provides a disc spring mechanical curve testing structure to at least solve the problem that the use of a spherical star loading indenter in the prior art leads to inaccurate disc spring pressure test curve.

[0006] The present application provides the following technical solutions: The present application provides a disc spring mechanical curve testing structure, which is applied to a tensile testing machine. The tensile testing machine includes a compression block that can move up and down, and the tensile testing machine can detect the displacement of the compression block and the pressure applied by the compression block. The disc spring mechanical curve testing structure includes: A structure base, which is a hollow cavity structure with at least an open upper end; A center column, which is a hollow cavity structure with at least an open upper end, is coaxially fixed inside the structure base, and the top edge of the center column is provided with a first mounting groove along the circumferential direction of the center column, wherein the inner ring of the disc spring can be fitted into the first mounting groove; A lower pressing part, which includes a lower pressing column and a lower pressing cover, and the top end of the lower pressing column is connected to the bottom end of the compression block; Wherein, during the movement of the pressing block towards the direction of the center column, the lower pressing column is inserted into the hollow cavity of the center column, and the lower pressing cover presses the outer edge of the disc spring.

[0007] Preferably, the top end of the center column is lower than the top end of the structural base, and the outer diameter of the lower pressing cover is equal to or slightly smaller than the inner diameter of the structural base. Wherein, when the lower pressing column enters the hollow cavity of the center column, the lower pressing cover enters the structural base.

[0008] Preferably, the side wall of the structural base is also provided with an exhaust hole for balancing the air pressure in the hollow cavity of the structural base. The disc spring mechanical curve test structure further comprises: A temperature adjusting part is arranged around the side wall of the structural base and is arranged in a staggered manner with the exhaust hole, and is used to adjust the internal temperature of the hollow cavity of the structural base.

[0009] Preferably, the outer side wall of the center column is provided with a first supporting part along the circumferential direction of the center column. The structural base further comprises: A second supporting part is arranged in the hollow cavity of the structural base along the circumferential direction of the structural base, a receiving space for inserting the center column is formed in the middle of the second supporting part, and the gas in the hollow cavity of the structural base can bypass / penetrate the second supporting part and be discharged from the exhaust hole. Wherein, after the center column is inserted into the receiving space, the second supporting part supports the first supporting part.

[0010] Preferably, the second supporting part is in the form of a ring structure and is arranged on the inner side wall of the structural base, and the inner hole of the second supporting part forms the receiving space. A first gas flow channel is vertically arranged on the second supporting part, and the first gas flow channel respectively communicates with the hollow cavity of the structural base and the exhaust hole.

[0011] Preferably, a second gas flow channel is formed between the inner wall of the center column and the lower pressing column, and when the lower pressing column is inserted into the hollow cavity of the center column, the gas inside the center column can flow out from the second gas flow channel into the hollow cavity of the structural base to balance the air pressure inside the center column.

[0012] Preferably, the disc spring mechanical curve test structure further comprises: A first open loop structure is arranged in the first mounting groove to support the inner ring of the disc spring from the inner side edge.

[0013] Preferably, the inner wall end of the bottom end of the lower pressing cover is provided with a second installation groove along the circumference thereof; Preferably, the disc spring mechanical curve test structure further comprises: A second open ring structure is embedded in the second installation groove, the lowest point of the second open ring structure corresponds to the inner side of the outer edge of the disc spring, and the bottom surface of the second open ring is provided in an arc structure.

[0014] Preferably, the disc spring mechanical curve test structure further comprises: A first protruding part is provided above the first open ring structure along the circumference of the center column and is arranged towards the inner wall of the disc spring, and there is a gap between the inner wall of the disc spring and the outer wall of the first protruding part.

[0015] Preferably, the lower pressing cover comprises a lower pressing plate and a lower pressing ring. The lower pressing plate is coaxially connected to the middle part of the lower pressing column, the lower pressing ring is in an annular structure and is arranged at the outer edge of the lower pressing plate along the circumference of the lower pressing plate, and the inner wall of the end of the lower pressing ring is provided with the second installation groove.

[0016] On the basis of common knowledge in the art, the preferred conditions can be combined arbitrarily, that is, the preferred embodiments of the present application are obtained.

[0017] Compared with the prior art, the above-mentioned at least one technical scheme adopted by the embodiments of the present application can achieve the beneficial effects at least including: The disc spring mechanical curve test structure of the present application sets a lower pressing column and a lower pressing cover at the bottom end of the pressure block of a tensile testing machine, sets a structure base and a center column below the lower pressing column and the lower pressing cover, so that when the disc spring is reversely sleeved on the center column, the outer edge of the disc spring is higher than the inner edge of the disc spring, the lower pressing column enters the hollow cavity of the center column when the pressure block goes down, the lower pressing cover presses the outer edge of the disc spring, so that the disc spring does not generate frictional force with the supporting base, and when the disc spring is deformed by being pressed, the stress position is always the outer edge of the disc spring, and the stress state does not change suddenly, thereby improving the accuracy of the disc spring pressure test curve tested by the tensile testing machine and solving the problem of inaccurate disc spring pressure test curve caused by the ball star loading pressure head in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1A side sectional view of a disc spring mechanical curve test structure according to an embodiment of the present application Figure 2 A partial sectional view according to an embodiment of the present application Figure 1 ; Figure 3 A partial sectional view according to an embodiment of the present application Figure 2 .

[0020] Reference signs of the present application are as follows: 1, structure base; 11, exhaust hole; 12, second support part; 121, first air flow channel; 2, center column; 21, first mounting groove; 22, first support part; 23, second air flow channel; 3, disc spring; 4, pressing part; 41, pressing column; 42, pressing cover; 421, second mounting groove; 422, pressing plate; 423, pressing ring; 5, temperature adjusting part; 6, first open loop structure; 7, second open loop structure; 8, first protruding part. DETAILED DESCRIPTION

[0021] The embodiments of the present application will be described in detail below with reference to the drawings.

[0022] The above embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. The present application can also be implemented or applied through other different specific embodiments, and each detail in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0023] It should be noted that the various aspects described below are within the scope of the embodiments claimed. It should be apparent that the aspects described herein can be embodied in a wide variety of forms and that any specific structure and / or function described herein is merely illustrative. Based on the teachings herein one skilled in the art should appreciate that an aspect described herein can be implemented independently of any other aspects and that an aspect can be implemented both as any number of software and / or hardware structures and as any number of combinations of software and / or hardware structures. For example, an apparatus can be implemented as any number and combination of the aspects described herein. Additionally, the features described herein can be implemented as part of one or more separate devices or components, or as part of an application-specific computer system.

[0024] It is also necessary to note that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and only show the components related to the present application in the drawings, not drawn according to the number, shape and size of the components in actual implementation. The actual implementation of each component type, number and proportion can be a random change, and the component layout type can be more complex.

[0025] In addition, in the following description, specific details are provided in order to facilitate a thorough understanding of the examples. However, one skilled in the art will understand that the practice can be practiced without these specific details.

[0026] The disc spring 3 is widely used in mechanical pressure switches as a key elastic element due to its high stiffness, small deformation, space utilization, and other advantages, directly determining the action pressure and reset pressure of the switch. The stress-deformation characteristic curve of the disc spring 3 is not only the core input parameter in the product design stage, but also the important basis for batch consistency evaluation, life test and fault tracing in the batch production process.

[0027] The single disc spring 3 is not large in size and mainly provides elastic force. In a mechanical pressure switch, if the disc spring 3 is designed and selected improperly, it will lead to insufficient pre-tightening force or plastic deformation of the disc spring 3 due to large load, thereby causing equipment failure. In order to better analyze and solve this problem, the existing technology uses a tool to test the disc spring 3 to study the influence of the thickness, inner diameter and other size parameters of the disc spring 3 on the elastic performance of the disc spring 3.

[0028] In the prior art, a microcomputer-controlled electronic universal testing machine can be used to perform compression tests on test pieces. According to the loading condition of the disc spring 3 in use, a spherical loading indenter, a supporting circular table, and an inner guide column are designed, and the inner guide column is connected with the spherical loading indenter. When the spherical loading indenter is in contact with the disc spring 3 during loading, the inner guide column passes through the inner diameter of the disc spring 3, thereby playing a guiding and anti-side-sliding role.

[0029] In the performance test of the disc spring 3, the lower end of the testing machine is fixed, the upper end is loaded, displacement control is adopted, and static load is applied. The loading speed of the testing machine is 1 mm / min, the outer end surface (small end) of the inner diameter d of the disc spring 3 is in contact with the spherical loading head during the test process, the outer end surface (large end) of the outer diameter D of the disc spring 3 is in contact with the supporting circular table (fixed), and the testing machine collects real-time input displacement and output force data when the pre-pressing displacement amount in the direction of the axis of the disc spring 3 is 1 mm (flat) and 2 mm (turnover), respectively. The relationship curve between the compression force and the displacement of the inner end surface (small end) of the disc spring 3 is obtained.

[0030] For the prior art scheme, during the pressure process of the disc spring 3, friction force is generated between the outer edge of the disc spring 3 and the supporting circular table, which affects the accuracy of the test result. Moreover, during the test, the stress position of the disc spring 3 is the position where the outer edge of the disc spring 3 abuts against the supporting circular table during the pressing process of the spherical pressure head on the disc spring 3. However, after the spherical pressure head presses the disc spring 3, the disc spring 3 is deformed into the opposite cylindrical groove, at this time, the stress position of the disc spring 3 changes to the position where the disc spring 3 abuts against the edge of the slot of the cylindrical groove. Since the stress position of the disc spring 3 changes, the data obtained by the test is also inaccurate.

[0031] Therefore, the inventor has found, through in-depth research and improvement exploration on the spring sheet shape, stress structure, and tensile testing machine, that: by sleeving the inner ring of the disc spring 3 in the first installation groove 21 of the center column 2, the center column 2 is used to horizontally limit the disc spring 3, and the first installation groove 21 is used to limit the disc spring 3 at the top end of the center column 2, and then the lower pressing part 4 installed on the pressing block of the tensile testing machine is used to press the outer edge of the disc spring 3, so that the tensile testing machine can detect the mechanical curve of the disc spring 3 through the displacement amount and stress of the pressing block.

[0032] Based on this, the embodiment of the present application provides a processing scheme: as shown in the Figure 1 The disc spring mechanical curve test structure of the present application comprises a lower pressing part 4 installed at the bottom of the pressing block of a tensile testing machine, the lower pressing part 4 comprises a lower pressing column 41 and a lower pressing cover 42, the disc spring 3 is sleeved in the first installation groove 21 of the center column 2 during the test, and the inner concave surface of the disc spring 3 faces the pressing block, when the lower pressing part 4 moves with the pressing block towards the disc spring 3, the lower pressing column 41 enters the center column 2, and the outer edge of the disc spring 3 is pressed by the lower pressing cover 42, during the pressing process of the lower pressing cover 42, the tensile testing machine can detect the displacement amount and stress curve of the disc spring 3 pressed by the pressing block and the lower pressing cover 42, so as to obtain the mechanical test curve of the disc spring 3.

[0033] The technical solutions provided by the embodiments of the present application are described below with reference to the accompanying drawings.

[0034] Embodiment 1 The disc spring mechanical curve test structure provided by the embodiment of the present application is applied to a tensile testing machine, the tensile testing machine comprises a pressing block that can be displaced up and down, and the tensile testing machine can detect the displacement amount of the pressing block and the pressure applied outward by the pressing block.

[0035] The tensile testing machine can draw a mechanical test curve between the displacement amount and the pressure by detecting the displacement amount and the pressure applied outward by the pressing block.

[0036] As shown in the Figure 1-2As shown, the disc spring mechanical curve test structure comprises a structure base 1, a center column 2 and a pressing part 4. The structure base 1 is a hollow cavity structure with at least an upper end opening; the center column 2 is a hollow cavity structure with at least an upper end opening, which is coaxially fixed inside the structure base 1, and the top edge of the center column 2 is provided with a first mounting groove 21 along the circumferential direction of the center column 2, wherein the inner ring of the disc spring 3 can be sleeved in the first mounting groove 21; the pressing part 4 comprises a pressing column 41 and a pressing cover 42, and the top end of the pressing column 41 is connected to the bottom end of the pressing block; wherein, in the process of moving the pressing block in the direction of the center column 2, the pressing column 41 is inserted into the hollow cavity of the center column 2, and the pressing cover 42 presses the outer edge of the disc spring 3.

[0037] The structure base 1 can be mounted on the base of the tensile testing machine to provide a stable installation environment and facilitate the up-and-down correspondence with the pressing block of the tensile testing machine. The structure base 1 can be a cylindrical structure with upper and lower openings, and the entire structure base 1 is a circular structure, and the internal cavity thereof is also a cylindrical structure to adapt to the circular disc spring 3.

[0038] For example, the structure base 1 comprises a cylinder part and a support part. The cylinder part is a cylindrical structure with upper and lower openings; and the support part is arranged around the bottom end of the cylinder part for being fixed to the base of the tensile testing machine by bolts.

[0039] Optionally, the structure base 1 is made of a metal heat-conducting material, such as stainless steel.

[0040] The center column 2 is a cylindrical structure, and it is a hollow cavity structure with both ends open, and the hollow cavity is a cylindrical structure. The first mounting groove 21 is formed on the top end sidewall of the center column 2, and the first mounting groove 21 is formed along the axial direction of the center column 2 to form a circular groove.

[0041] Specifically, the first mounting groove 21 comprises a horizontal sidewall and a vertical sidewall, and the disc spring 3 is sleeved on the vertical sidewall of the first mounting groove 21 and is supported by the horizontal sidewall.

[0042] The gap is between the disc spring 3 and the vertical sidewall of the first mounting groove 21.

[0043] In this application, since the pressing part 4 presses the disc spring 3 from top to bottom, the inner concave surface of the disc spring 3 faces the tensile testing machine during installation, that is, after the disc spring 3 is sleeved on the center column 2, the outer edge of the disc spring 3 is higher than the inner edge of the disc spring 3.

[0044] The pressing part 4 is used for moving up and down with the pressing block to press or release the disc spring 3. Specifically, the pressing column 41 of the pressing part 4 can be inserted into the center column 2 when moving downward; and the pressing cover 42 of the pressing part 4 can enter the structure base 1 when moving downward to press the disc spring 3.

[0045] Optionally, when the lower pressing cover 42 enters the structural base 1, the outer diameter of the lower pressing cover 42 and the inner diameter of the cavity of the structural base 1 are in sliding connection, so that the structural base 1 is used to limit the lower pressing cover 42, and displacement of the lower pressing cover 42 in the horizontal direction is avoided.

[0046] Preferably, the cavity structure of the lower pressing column 41 and the center column 2 is also in sliding connection, so that deviation of the center column 2 in the horizontal direction during the pressing process is avoided.

[0047] Specifically, the lower pressing cover 42 comprises a lower pressing plate 422 and a lower pressing ring 423; the lower pressing plate 422 is coaxially connected to the middle part of the lower pressing column 41; the lower pressing ring 423 is in an annular structure and is arranged at the outer edge of the lower pressing plate 422 along the circumference of the lower pressing plate 422, and is used to press the outer edge of the disc spring 3.

[0048] The bottom end of the lower pressing cover 42 is provided with the lower pressing ring 423, so that the middle part of the lower pressing cover 42 forms a cavity, so as to avoid the middle part of the lower pressing cover 42 pressing the disc spring 3. For example, the middle part of the lower pressing cover 42 does not press the higher position of the middle part of the disc spring 3 during the pressing process of the disc spring 3, so as to avoid inaccurate mechanical curve test.

[0049] The disc spring mechanical curve test structure of the embodiment of the present application can avoid interference of the disc spring 3 with the surrounding structure during the test, and can avoid insufficient test accuracy of the disc spring 3 caused by friction, so as to solve the problem of inaccurate pressure test curve caused by the spherical loading structure in the prior art, and improve the accuracy of the mechanical test curve.

[0050] In some embodiments, the top end of the center column 2 is lower than the top end of the structural base 1, and the outer diameter of the lower pressing cover 42 is equal to or slightly smaller than the inner diameter of the structural base 1; when the lower pressing column 41 enters the hollow cavity of the center column 2, the lower pressing cover 42 enters the structural base 1.

[0051] The top end of the center column 2 is arranged to be lower than the top end of the structural base 1, so that after the disc spring 3 is sleeved on the top end of the center column 2, the disc spring 3 is located in the structural base 1, and finally the lower pressing cover 42 enters the structural base 1 to press the disc spring 3, so that the structural base 1 can guide and limit the lower pressing cover 42.

[0052] Further, the side wall of the structural base 1 is also provided with an exhaust hole 11, which is used to balance the air pressure in the structural base 1, so as to avoid that the gas in the structural base 1 is compressed by the lower pressing cover 42, and the mechanical curve test of the disc spring 3 is inaccurate when the lower pressing cover 42 is pressed down.

[0053] Further, the disc spring mechanical curve test structure further comprises a temperature adjusting part 5, which is arranged on the side wall of the structure base 1 and is arranged in a staggered manner with the exhaust hole 11, and is used for adjusting the internal temperature of the hollow cavity of the structure base 1.

[0054] The temperature adjusting part 5 can be a heating structure or a refrigeration structure, so as to test the mechanical curve of the disc spring 3 under high temperature or low temperature.

[0055] Preferably, the temperature adjusting part 5 is a flexible heating wire or a heating sheet, so as to test the mechanical curve of the disc spring 3 under high temperature.

[0056] Specifically, when the high-temperature mechanical curve test is performed, the temperature adjusting part 5 is used to increase the temperature in the structure base 1, and since the lower pressing cover 42 enters the structure base 1 during the test, a closed space is formed between the lower pressing cover 42 and the structure base 1, so as to reduce heat loss and facilitate maintaining the temperature in the structure base 1 within a specified range.

[0057] After the temperature adjusting part 5 is arranged on the side wall of the structure base 1, the exhaust hole 11 is further used to balance the air pressure in the structure base 1, so as to avoid that the air pressure in the structure base 1 is increased due to temperature increase or is reduced due to temperature decrease, thereby reducing the accuracy of the mechanical curve of the disc spring 3.

[0058] In the embodiment of the present application, when the lower pressing cover 42 enters the structure base 1 to press the disc spring 3, a substantially closed space is formed between the structure base 1 and the lower pressing cover 42, so as to facilitate the temperature adjusting part 5 to adjust the temperature in the structure base 1, and at the same time, the pressure in the structure base 1 is adjusted through the exhaust hole 11, so as to realize that the tensile testing machine can test the mechanical curve of the disc spring 3 under different temperatures, and the test result is accurate and is not affected by the change of the pressure caused by the change of the temperature.

[0059] Further, the outer side wall of the center column 2 is provided with a first supporting part 22 along the circumferential direction of the center column 2, so as to facilitate the center column 2 to be supported and arranged in the structure base 1.

[0060] The structure base 1 further comprises a second supporting part 12, which is arranged in the hollow cavity of the structure base 1 along the circumferential direction of the structure base 1, a containing space for inserting the center column 2 is formed in the middle of the second supporting part 12, and the gas in the hollow cavity of the structure base 1 can bypass or pass through the second supporting part 12 and be discharged from the exhaust hole 11; wherein, after the center column 2 is inserted into the containing space, the second supporting part 12 supports the first supporting part 22.

[0061] The second support part 12 is used in cooperation with the first support part 22 to position the center column 2 inside the structural base 1. After the second support part 12 and the first support part 22 are connected in cooperation, the gas above the second support part 12 can still bypass or pass through the second support part 12 and be discharged from the exhaust hole 11 below. At this time, the exhaust hole 11 is located below the second support part 12.

[0062] For example, the second support part 12 is a ring-shaped belt hole structure, and an inner ring of the ring-shaped belt hole structure forms an accommodation space; or the second support part 12 includes a plurality of protrusions arranged at intervals, and an accommodation space is formed between the plurality of protrusions.

[0063] Preferably, the second support part 12 is a ring-shaped structure and is arranged on the inner side wall of the structural base 1, and an inner hole of the second support part 12 forms an accommodation space; a first airflow channel 121 is vertically arranged on the second support part 12, and the first airflow channel 121 is respectively connected to the hollow cavity of the structural base 1 and the exhaust hole 11.

[0064] In some embodiments, when the first airflow channel 121 is one, the exhaust hole 11 is connected to the first airflow channel 121; when the first airflow channel 121 is a plurality, each first airflow channel 121 is connected to a corresponding exhaust hole 11 or a plurality of first airflow channels 121 are connected to the exhaust hole 11.

[0065] Therefore, the second support part 12 cooperates with the first support part 22 to support and fix the center column 2, so that the center column 2 can be stably positioned inside the structural base 1, and the second support part 12 and the first support part 22 can be detachably connected, so that different sizes of the center column 2 can be replaced, and different sizes of the disc spring 3 can be tested.

[0066] In some embodiments, a second airflow channel 23 is formed between the inner wall of the center column 2 and the lower pressing column 41, and when the lower pressing column 41 is inserted into the hollow cavity of the center column 2, the gas inside the center column 2 can flow out of the second airflow channel 23 into the hollow cavity of the structural base 1, so as to balance the air pressure inside the center column 2, avoid the air pressure of the center column 2 being compressed or changed by temperature, and thus avoid the air pressure being increased or decreased to exert an upward or downward force on the lower pressing column 41, thereby affecting the testing accuracy of the tensile testing machine.

[0067] Preferably, a gap is arranged between the inner wall of the center column 2 and the lower pressing column 41 to form the second airflow channel 23. In addition, a corresponding airflow channel can also be arranged on the inner wall of the center column 2 or the outer wall of the lower pressing column 41 to make the gas flow out to balance the air pressure inside the center column 2.

[0068] In some embodiments, the bottom end of the center column 2 is an open structure, so that the bottom end of the center column 2 is connected to the hollow cavity of the structural base 1.

[0069] The range of the tensile testing machine device of the embodiment of the present application can be 100N. During the testing of the disc spring 3, the base of the spring tensile testing machine is fixed, the upper end pressing block is attached with a tool lower pressing cover 42 for loading, and the disc spring 3 is loaded by controlling the displacement. The moving speed of the spring tensile testing machine pressing block can be 2mm / min. During the testing, the inner edge of the disc spring 3 is in contact with and fixed to the center column 2, the outer edge of the disc spring 3 is in contact with and downwardly displaced in the axial direction of the disc spring 3 with the lower pressing cover 42, and the spring tensile testing machine collects the pressure and the outer diameter displacement data of the disc spring 3 in real time during the process, and generates the corresponding mechanical curve.

[0070] The disc spring mechanical curve testing structure of the embodiment of the present application can accurately measure the mechanical curve of the disc spring 3 at different temperatures through the structure base 1, the center column 2, the lower pressing part 4, the temperature adjusting part 5, the exhaust hole 11 and the like, and the pressure receiving position of the disc spring 3 is always the outer edge of the disc spring 3, and the stress state of the disc spring 3 will not be suddenly changed, thereby improving the accuracy of the disc spring 3 pressure testing curve tested by the tensile testing machine, and solving the problem of inaccurate disc spring 3 pressure testing curve caused by the ball star loading pressure head in the prior art.

[0071] Embodiment 2 The embodiment of the present application is a variant of the embodiment 1, and the difference between the embodiment 1 and the embodiment 2 is that the disc spring mechanical curve testing structure further comprises a first open loop structure 6 and a second open loop structure 7.

[0072] The first open loop structure 6 is sleeved in the first mounting groove 21 to support the inner ring of the disc spring 3 from the inner side edge, and the surface of the first open loop structure 6 facing the disc spring 3 is an arc surface, so as to reduce the contact area between the first open loop structure 6 and the disc spring 3 and reduce the influence of the first open loop structure 6 on the disc spring 3.

[0073] The first open loop structure 6 supports the inner ring of the disc spring 3 and reduces the contact area with the disc spring 3, so as to avoid the inner ring of the disc spring 3 abutting or abutting against the horizontal side wall of the first mounting groove 21 after the disc spring 3 is pressed, that is, to avoid the side surface of the disc spring 3 close to the inner ring abutting against the horizontal side wall of the first mounting groove 21, so as to improve the accuracy of the disc spring mechanical curve testing.

[0074] The inner diameter of the first open loop structure 6 in the normal state is smaller than the outer diameter of the vertical side wall of the first mounting groove 21, so as to be interference-fitted on the vertical side wall of the first mounting groove 21, and to ensure that the first open loop structure 6 will not be separated during pressing the disc spring 3.

[0075] Further, the bottom inner side wall end of the lower pressing cover 42 is provided with a second mounting groove 421 along the circumferential direction thereof; the second open loop structure 7 is embedded in the second mounting groove 421, and preferably, the lowest point of the second open loop structure 7 is located below the bottom surface of the lower pressing cover 42.

[0076] The second mounting groove 421 is formed on the inner ring of the lower pressing ring 423 .

[0077] Among them, the second open-loop structure 7 is used to reduce the contact area between the outer edge of the disc spring 3 and the bottom surface of the lower pressure cover 42, so as to avoid the large contact area between the disc spring 3 and the bottom surface of the lower pressure cover 42 after the disc spring 3 is compressed, resulting in a large friction force, thereby affecting the accuracy of the mechanical curve.

[0078] Preferably, the lowest point of the second open-loop structure 7 corresponds to the inner side of the outer edge of the disc spring 3, and the bottom surface of the second open-loop structure 7 is set to an arc structure to further reduce the contact area between the second open-loop structure 7 and the outer edge of the disc spring 3.

[0079] Among them, the inner diameter of the second open-loop structure 7 in the normal state is larger than the outer diameter of the vertical side wall of the second mounting groove 421. The second open-loop structure 7 is embedded in the second mounting groove 421 by extrusion to ensure that the second open-loop structure 7 will not detach during the process of pressing the disc spring 3.

[0080] Furthermore, if Figure 3 As shown, the disc spring mechanical curve test structure also includes a first protrusion 8, which is arranged above the first open-loop structure 6 along the circumference of the center column 2 and toward the inner wall of the disc spring 3, and there is a gap between the inner wall of the disc spring 3 and the outer wall of the first protrusion 8. On the one hand, the first protrusion 8 can limit the first open-loop structure 6 from above to avoid displacement of the first open-loop structure 6. On the other hand, the first protrusion 8 can reduce the gap between the inner wall of the disc spring 3 and the vertical inner wall of the first mounting groove 21, thereby ensuring that the inner edge area of ​​the disc spring 3 remains in contact with the center position of the first open-loop structure 6, avoiding the displacement of the force position during the compression process of the disc spring 3, and improving the test accuracy.

[0081] The embodiment of the present invention respectively provides a first open-loop structure 6 and a second open-loop structure 7 on the inner ring of the lower pressure cover 42 and the outer ring of the center column 2, so as to contact the outer edge and inner edge of the disc spring 3, thereby ensuring that the disc spring 3 remains in contact with the first open-loop structure 6 and the second open-loop structure 7 during the pressing process of the lower pressure cover 42, thereby avoiding the occurrence of force position displacement and affecting the test accuracy; in addition, during the pressing process of the lower pressure cover 42, the disc spring 3 contacts the arc surfaces of the first open-loop structure 6 and the second open-loop structure 7, which also reduces the friction during the pressing process and further improves the accuracy of the test.

[0082] The disc spring mechanical curve testing structure of the present invention has low cost and high adaptability, and the disc spring 3 is tested by a small-range spring tension and compression testing machine, which improves its resolution and avoids the problem of inaccurate measurement of large equipment under small range; in addition, the lower pressure cover 42 directly drives the displacement of the outer edge of the disc spring 3, and the center column 2 fixes the pentagon. The displacement sensor reading is the actual compression amount of the disc spring 3, so there is no need for flexibility correction, and the displacement measurement is more accurate and direct.

[0083] The disc spring mechanical curve test structure of the present application fixes the small diameter (inner edge) of the disc spring 3 through the center column 2, replaces the traditional inner guide column and lubricated sliding guide, completely eliminates the interference of guide friction on force value measurement, and also avoids the stiffness data drift caused by the change of oil film thickness; and the lower pressing cover 42 only axially restricts the large diameter of the disc spring 3, allows radial free deformation, and accurately reproduces the elastic boundary condition in actual installation (especially the large end lifting behavior in the pressure turning stage).

[0084] In the specification, the same or similar parts among various embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments. Especially, for the product embodiment described later, since it is corresponding to the method, the description is relatively simple, and the related parts can be referred to the part of the system embodiment.

[0085] The above merely describes the specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A disc spring mechanical curve testing structure, applied to a tension and compression testing machine, the tension and compression testing machine including a compression block that can move up and down, and the tension and compression testing machine can detect the displacement of the compression block and the pressure applied by the compression block, characterized in that: The disc spring mechanical curve test structure includes: A structural base, wherein the structural base is a hollow cavity structure with at least an upper end open; A center column, the center column being a hollow cavity structure with at least an upper end open, coaxially fixed to the interior of the structural base, and having a first mounting groove defined along its circumference on a top edge of the center column, wherein the inner ring of the disc spring can be sleeved within the first mounting groove; A pressing portion, comprising a pressing column and a pressing cover, wherein the top end of the pressing column is connected to the bottom end of the pressing block; Wherein, when the pressure block moves toward the direction where the central column is located, the lower pressure column is inserted into the hollow cavity of the central column, and the lower pressure cover presses the outer edge of the disc spring.

2. The disc spring mechanical curve testing structure according to claim 1, characterized in that: The top of the central column is lower than the top of the structural base, and the outer diameter of the lower gland is equal to or slightly smaller than the inner diameter of the structural base; Wherein, when the lower pressure column enters the hollow cavity of the central column, the lower pressure cover enters the structural base.

3. The disc spring mechanical curve testing structure according to claim 2, characterized in that: An exhaust hole is also provided on the side wall of the structural base, and the exhaust hole is used to balance the air pressure in the structural base; The disc spring mechanical curve testing structure further includes: The temperature regulating portion is arranged around the side wall of the structural base and is staggered with the exhaust hole, and is used to regulate the internal temperature of the hollow cavity of the structural base.

4. The disc spring mechanical curve testing structure according to claim 3, characterized in that: The outer side wall of the central column is provided with a first support portion along its circumference; The structural base also includes: a second supporting portion, the second supporting portion being arranged in the hollow cavity of the structural base along the circumference of the structural base, the middle portion of the second supporting portion forming an accommodating space for inserting the central column, and the gas in the hollow cavity of the structural base being able to bypass / pass through the second supporting portion and be discharged from the exhaust hole; Wherein, after the central column is inserted into the accommodating space, the second supporting portion supports the first supporting portion.

5. The disc spring mechanical curve testing structure according to claim 4, characterized in that: The second supporting portion is an annular structure and is arranged on the inner side wall of the structural base, and the inner hole of the second supporting portion forms the accommodating space; A first air flow channel is vertically opened on the second supporting portion, and the first air flow channel is connected to the hollow cavity of the structural base and the exhaust hole respectively.

6. The disc spring mechanical curve testing structure according to claim 3, characterized in that: A second air flow channel is formed between the inner wall of the central column and the lower pressure column. When the lower pressure column is inserted into the hollow cavity of the central column, the gas inside the central column can flow out from the second air flow channel into the hollow cavity of the structural base to balance the air pressure inside the central column.

7. The disc spring mechanical curve testing structure according to any one of claims 1 to 6, characterized in that: Also includes: A first open-loop structure is sleeved in the first mounting groove to support the inner ring of the disc spring by the inner edge.

8. The disc spring mechanical curve testing structure according to claim 7, characterized in that: The inner side wall end of the bottom end of the lower gland is provided with a second mounting groove along its circumference. The disc spring mechanical curve testing structure further includes: The second open-loop structure is embedded in the second mounting groove, the lowest point of the second open-loop structure corresponds to the inner side of the outer edge of the disc spring, and the bottom surface of the second open loop is set to an arc structure.

9. The disc spring mechanical curve testing structure according to claim 7, characterized in that: Also includes: A first protrusion is arranged above the first open-loop structure along the circumference of the center column and toward the inner wall of the disc spring, and there is a gap between the inner wall of the disc spring and the outer wall of the first protrusion.

10. The disc spring mechanical curve testing structure according to claim 8, characterized in that: The lower pressure cover includes a lower pressure plate and a lower pressure ring; The lower pressure plate is coaxially connected to the middle part of the lower pressure column; the lower pressure ring is an annular structure and is arranged on the outer edge of the lower pressure plate along the circumference of the lower pressure plate, and the inner side wall of the end of the lower pressure ring is provided with the second mounting groove.

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