A compression spring compression performance testing tool and method

Abstract

The application relates to the technical field of spring performance testing, and discloses a compression performance testing tool and method for compression springs; the tool comprises a first connecting piece, a pressure head, a sleeve and a second connecting piece which are sequentially arranged from top to bottom along the vertical direction; the first connecting piece is connected with an upper connecting seat of an electronic testing machine, the second connecting piece is connected with a lower connecting seat of the electronic testing machine, and a test cavity arranged in the sleeve provides a test space for the compression spring to be tested; meanwhile, the sleeve can effectively prevent the compression spring from flying out due to transverse bending and excessive load, and prevent safety hazards; and the pressure head and the sleeve for extruding the compression spring are detachably connected with the first connecting piece and the second connecting piece respectively, different specifications of the pressure head and the sleeve can be replaced according to the compression springs with different diameters, and the applicability is improved.

Description

Technical Field

[0001] This invention relates to the field of spring performance testing technology, and in particular to a tooling and method for testing the compression performance of a compression spring. Background Technology

[0002] A compression spring is a helical spring that withstands axial pressure. There is a certain gap between the coils of a compression spring. When subjected to an external load, the spring contracts and deforms, storing deformation energy; and when released, it converts the energy into mechanical work.

[0003] Before a compression spring can be put into service, its compression performance needs to be tested to assess whether the designed spring meets the usage requirements. Current compression performance testing typically involves applying an axial load to the compression spring using an electronic testing machine, and then determining the compression performance by observing the deformation of the spring under load and compression.

[0004] The length-to-diameter ratio (L / D ratio) of a compression spring refers to the ratio of its free length to its mean diameter. Generally, when designing springs, the L / D ratio should be between 0.8 and 4 to balance the requirements of stiffness, load-bearing capacity, and stability. In some space-constrained applications requiring large strokes, low force values, or dynamic responses, such as cardiovascular stent delivery systems, high-stroke keyboards, and nuclear reactor control rod drive mechanisms, a larger L / D ratio is necessary. However, an excessively large L / D ratio can cause lateral bending under load, leading to a sudden drop in stiffness or even failure. Existing spring compression performance testing equipment lacks structures to handle lateral bending, making it highly susceptible to spring ejection due to bending during testing, posing a safety hazard. Summary of the Invention

[0005] The purpose of this invention is to provide a tooling and method for testing the compression performance of compression springs, thereby solving the problem that existing spring compression performance testing devices lack a structure to cope with the lateral bending of the spring, which leads to safety hazards.

[0006] To achieve the above objectives, the present invention provides a compression performance testing fixture for a compression spring, which includes a first connecting member, a pressure head, a sleeve, and a second connecting member arranged sequentially from top to bottom in a vertical direction; The first connector is provided with a first through hole penetrating its two outer peripheral walls, and the first through hole is used for installation with the upper connecting seat of the electronic testing machine; The second connector is provided with a second through hole penetrating its two outer peripheral walls, and the second through hole is used for installation with the lower connecting seat of the electronic testing machine; The sleeve is provided with a test cavity extending through its upper and lower surfaces; the sleeve is detachably connected to the second connector; the top of the second connector has a placement surface for placing a compression spring, and the placement surface is located inside the test cavity; The pressure head is detachably connected to the first connector and can be movably inserted into the test chamber; The diameter of the pressure head is larger than the diameter of the compression spring.

[0007] Furthermore, the first connector includes a first adapter; The first adapter includes a first fixing part and a first adapter part connected sequentially from top to bottom, and the diameter of the first fixing part is smaller than the diameter of the first adapter part; The first through hole is provided in the first fixing part.

[0008] Furthermore, the first connector also includes a first fixing plate, which has a first fixing hole penetrating its upper and lower surfaces, and the first fixing hole is an internal thread hole; The first fixing part has an external thread on its outer peripheral wall below the first through hole, and the first fixing plate is sleeved on the outer periphery of the first fixing part and threadedly connected to the first fixing part. The diameter of the first fixing plate is larger than the diameter of the upper connecting seat of the electronic testing machine.

[0009] Furthermore, a first adapter hole is provided on the lower surface of the first adapter portion, and the first adapter hole is an internal thread hole; The top outer circumference of the pressure head is provided with an external thread, and the pressure head is threadedly connected to the first adapter hole.

[0010] Furthermore, the second connector includes a second adapter; The second adapter includes a second fixing part and a second adapter part connected sequentially from bottom to top, and the diameter of the second fixing part is smaller than the diameter of the second adapter part; The second through hole is provided in the second fixing part.

[0011] Furthermore, the second connector also includes a second fixing plate, which has a second fixing hole penetrating its upper and lower surfaces, and the second fixing hole is an internal thread hole; The second fixing part has an external thread on its outer peripheral wall above the second through hole, and the second fixing plate is sleeved on the outer periphery of the second fixing part and threadedly connected to the second fixing part; The diameter of the second fixing plate is larger than the diameter of the lower connecting seat of the electronic testing machine.

[0012] Furthermore, the second connector also includes a connecting post; The upper surface of the second adapter is provided with a second adapter hole, which is an internal thread hole; The bottom inner circumferential wall of the sleeve is provided with internal threads; The upper and lower ends of the connecting column are provided with external threads on their outer peripheral walls; the upper and lower ends of the connecting column are respectively threaded to the sleeve and the second adapter hole; the upper surface of the connecting column is the placement surface, which is perpendicular to the vertical direction.

[0013] Furthermore, a protrusion is provided between the external threads at the upper and lower ends of the connecting column, and the protrusion is arranged around the outer peripheral wall of the connecting column and extends outward.

[0014] Furthermore, the outer peripheral wall of the protrusion has two opposing and parallel gripping surfaces.

[0015] This invention also provides a method for testing the compression performance of a compression spring, which uses the aforementioned compression performance testing fixture to perform the compression performance test, and includes the following steps: S1. Connect the first connector to the upper connector of the electronic testing machine; S2. Connect the second connector to the lower connector of the electronic testing machine; S3. Insert the compression spring to be tested into the sleeve and place it on the placement surface; S4. Zero the displacement and load of the electronic testing machine; S5. Use an electronic testing machine to drive the pressure head downwards, so that the pressure head abuts against the compression spring; S6. Using an electronic testing machine to apply constant speed loading, drive the pressure head to move downward; S7. Compress the compression spring to the predetermined deformation amount and stop the electronic testing machine from loading; The compression performance of the compression spring is determined based on the load and deformation of the electronic testing machine obtained from the test.

[0016] The compressibility testing fixture and method for compression springs provided by this invention have the following advantages compared with the prior art: This invention provides a compression performance testing fixture for compression springs, comprising a first connecting member, a pressure head, a sleeve, and a second connecting member arranged vertically from top to bottom. The first connecting member connects to the upper connecting seat of an electronic testing machine, and the second connecting member connects to the lower connecting seat of the same machine. The sleeve provides a testing space for the compression spring under test through a testing cavity, while effectively preventing lateral bending and excessive load that could cause the spring to fly out, thus preventing safety hazards. Furthermore, the pressure head and sleeve used to compress the compression spring are detachably connected to the first and second connecting members, respectively, allowing for the replacement of pressure heads and sleeves of different specifications for compression springs of different diameters, thus improving applicability.

[0017] The present invention provides a method for testing the compression performance of a compression spring. The compression performance test is performed using the above-mentioned compression performance test fixture. The compression spring is placed inside the sleeve and a load is applied to the compression spring through the indenter to complete the compression performance test. This method avoids the problem of the compression spring bending laterally or even popping out during the test, which could pose a safety hazard. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of a compression performance testing fixture for a compression spring according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a compression performance testing fixture for a compression spring according to an embodiment of the present invention; Figure 3 This is an exploded view of a compression performance testing fixture for a compression spring according to an embodiment of the present invention.

[0019] In the figure, 100 is a tooling for testing the compression performance of a compression spring; 1 is a first connecting piece; 10 is a first through hole; 11 is a first adapter; 111 is a first fixing part; 112 is a first adapter; 1120 is a first adapter hole; 12 is a first fixing plate; 120 is a first fixing hole; 2 is a pressure head; 3 is a sleeve; 30 is a test chamber; 4 is a second connecting piece; 40 is a second through hole; 401 is a placement surface; 41 is a second adapter; 411 is a second fixing part; 412 is a second adapter; 4120 is a second adapter hole; 42 is a second fixing plate; 420 is a second fixing hole; 43 is a second fixing plate; 431 is a protrusion; 4310 is a gripping surface; and 200 is a compression spring. Detailed Implementation

[0020] 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.

[0021] In the description of this invention, it should be understood that the term "electronic testing machine" used in this invention refers to a mechanical property testing device for non-metallic materials such as tapes, rubber, and plastics, as well as metal wires, foils, and sheets. The structure and principle of loading are mature existing technologies and will not be described in detail here.

[0022] like Figures 1-3 As shown, an embodiment of the present invention provides a compression performance testing fixture 100 for a compression spring, which includes a first connecting member 1, a pressure head 2, a sleeve 3, and a second connecting member 4 arranged sequentially from top to bottom in the vertical direction; The first connector 1 is provided with a first through hole 10 penetrating its two outer peripheral walls, and the first through hole 10 is used for installation with the upper connecting seat of the electronic testing machine; The second connector 4 is provided with a second through hole 40 penetrating its two outer peripheral walls. The second through hole 40 is used for installation with the lower connecting seat of the electronic testing machine. The sleeve 3 is provided with a test cavity 30 extending through its upper and lower surfaces; the sleeve 3 is detachably connected to the second connecting member 4; the top of the second connecting member 4 has a placement surface 401 for placing the compression spring 200, and the placement surface is located inside the test cavity 30. The pressure head 2 is detachably connected to the first connector 1 and is movably inserted into the test chamber 30; The diameter of the pressure head 2 is larger than the diameter of the compression spring 200.

[0023] Based on the above technical solution, the upper connecting seat of the electronic testing machine is connected through the first connecting member 1, and the lower connecting seat of the electronic testing machine is connected through the second connecting member 4. The test cavity 30 set in the sleeve 3 provides a test space for the compression spring to be tested. At the same time, the sleeve 3 can effectively prevent the compression spring from bending laterally and flying out due to excessive load, thus preventing safety hazards. Furthermore, the pressure head 2 and the sleeve 3 used to compress the compression spring are detachably connected to the first connecting member 1 and the second connecting member 4, respectively. Different specifications of pressure head 2 and sleeve 3 can be replaced according to the compression spring of different diameters, thereby improving applicability.

[0024] Furthermore, such as Figures 1-3 As shown, the first connector 1 includes a first adapter 11; The first adapter 11 includes a first fixing part 111 and a first adapter part 112 connected sequentially from top to bottom, and the diameter of the first fixing part 111 is smaller than the diameter of the first adapter part 112; the first through hole 10 is provided in the first fixing part 111.

[0025] It is understood that the first adapter 11 is divided into two parts: a first fixing part 111 and a first adapter part 112. The first through hole 10 is provided in the first fixing part 111. The first fixing part 111 is used to insert into the upper connecting seat of the electronic testing machine, and the connection between the first fixing part 111 and the upper connecting seat is achieved by the pin passing through both the through hole of the upper connecting seat and the first through hole 10. Setting the diameter of the first adapter part 112 to be larger than the diameter of the first fixing part 111 can improve the overall stability of the first adapter 11.

[0026] Furthermore, such as Figures 1-3 As shown, the first connector 1 also includes a first fixing plate 12, the first fixing plate 12 having a first fixing hole 120 penetrating its upper and lower surfaces, the first fixing hole 120 being an internal threaded hole; The first fixing part 111 has an external thread on its outer peripheral wall below the first through hole 10, and the first fixing plate 12 is sleeved on the outer periphery of the first fixing part 111 and threadedly connected to the first fixing part 111. The diameter of the first fixing plate 12 is larger than the diameter of the upper connecting seat of the electronic testing machine.

[0027] It is understood that the first fixing plate 12 is threadedly connected to the external thread of the outer peripheral wall of the first fixing part 111, so that after the first fixing part 111 is connected to the upper connecting seat by a pin, the first fixing plate 12 can be screwed upward so that the first fixing plate 12 abuts against the upper connecting seat, thereby improving the stability and reliability of the connection between the first connecting member 1 and the upper connecting seat.

[0028] Furthermore, such as Figures 1-3 As shown, to specifically realize the connection between the first adapter part 112 and the pressure head 2, a first adapter hole 1120 is provided on the lower surface of the first adapter part 112, and the first adapter hole 1120 is an internal thread hole; The top outer periphery of the pressure head 2 is provided with an external thread, and the pressure head 2 is threadedly connected to the first adapter hole 1120.

[0029] Furthermore, such as Figures 1-3 As shown, similar to the arrangement of the first adapter 11, the second connector 4 includes a second adapter 41; The second adapter 41 includes a second fixing part 411 and a second adapter part 412 connected sequentially from bottom to top, and the diameter of the second fixing part 411 is smaller than the diameter of the second adapter part 412; The second through hole 40 is provided in the second fixing part 411.

[0030] Furthermore, such as Figures 1-3 As shown, similar to the arrangement of the first fixing plate 12; the second connecting member 4 also includes a second fixing plate 42, the second fixing plate 42 having a second fixing hole 420 penetrating its upper and lower surfaces, the second fixing hole 420 being an internal thread hole; The second fixing part 411 has an external thread on its outer peripheral wall above the second through hole 40, and the second fixing plate 42 is sleeved on the outer periphery of the second fixing part 411 and threadedly connected to the second fixing part 411. The diameter of the second fixing plate 42 is larger than the diameter of the lower connecting seat of the electronic testing machine.

[0031] Furthermore, such as Figures 1-3 As shown, in order to place the placement surface 401 within the test cavity 30, the second connector 4 also includes a connecting post 43; The upper surface of the second adapter part 412 is provided with a second adapter hole 4120, which is an internal thread hole. The inner circumferential wall at the bottom of the sleeve 3 is provided with internal threads; The upper and lower ends of the connecting post 43 are provided with external threads on their outer peripheral walls; the upper and lower ends of the connecting post 43 are respectively threaded to the sleeve 3 and the second adapter hole 4120; the upper surface of the connecting post 43 is the placement surface 401, and the placement surface 401 is perpendicular to the vertical direction.

[0032] Furthermore, to facilitate the turning of the connecting post 43, a protrusion 431 is provided between the external threads at the upper and lower ends of the connecting post 43. The protrusion 431 is arranged around the outer peripheral wall of the connecting post 43 and extends outward.

[0033] Furthermore, such as Figures 1-3 As shown, to facilitate the user's gripping of the protrusion 431, the outer peripheral wall of the protrusion 431 has two opposing and parallel gripping surfaces 4310.

[0034] This invention also provides a method for testing the compression performance of a compression spring, which uses the aforementioned compression performance testing fixture to perform the compression performance test, and includes the following steps: S1. Connect the first connector 1 to the upper connector of the electronic testing machine; S2. Connect the second connector 4 to the lower connector of the electronic testing machine; S3. Insert the compression spring 200 to be tested into the sleeve 3 and place it on the placement surface 401; S4. Zero the displacement and load of the electronic testing machine; S5. Use an electronic testing machine to drive the pressure head downwards, so that the pressure head 2 abuts against the compression spring 200; S6. Using an electronic testing machine to apply constant speed loading, drive the pressure head to move downward; S7. Compress the compression spring 200 to the predetermined deformation amount and stop the electronic testing machine from loading; The compression performance of the compression spring is determined based on the load and deformation of the electronic testing machine obtained from the test.

[0035] Based on the above technical solution, by placing the compression spring 200 inside the sleeve 3 and applying a load to the compression spring through the pressure head 2 to complete the compression performance test, the problem of the compression spring bending laterally or even popping out during the test, which poses a safety hazard, is avoided.

[0036] In summary, this invention provides a compression performance testing fixture 100 for compression springs, comprising a first connecting member 1, a pressure head 2, a sleeve 3, and a second connecting member 4 arranged vertically from top to bottom. The first connecting member 1 connects to the upper connecting seat of an electronic testing machine, and the second connecting member 4 connects to the lower connecting seat of the electronic testing machine. The test cavity 30 provided within the sleeve 3 provides testing space for the compression spring to be tested, while the sleeve 3 effectively prevents the compression spring from bending laterally and flying out due to excessive load, thus preventing safety hazards. Furthermore, the pressure head 2 and sleeve 3 used to compress the compression spring are detachably connected to the first connecting member 1 and the second connecting member 4, respectively, allowing for the replacement of pressure heads 2 and sleeves 3 of different specifications according to compression springs of different diameters, thereby improving applicability.

[0037] This invention also provides a method for testing the compression performance of a compression spring. The compression performance test is performed using the above-mentioned compression spring compression performance test fixture. The compression spring 200 is placed inside the sleeve 3, and a load is applied to the compression spring through the pressure head 2 to complete the compression performance test. This avoids the problem of the compression spring bending laterally or even popping out during the test, which could pose a safety hazard.

[0038] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A fixture for testing the compression performance of a compression spring, characterized in that, It includes a first connector, a pressure head, a sleeve, and a second connector arranged vertically from top to bottom; The first connector is provided with a first through hole penetrating its two outer peripheral walls, and the first through hole is used for installation with the upper connecting seat of the electronic testing machine; The second connector is provided with a second through hole penetrating its two outer peripheral walls, the second through hole being used for mounting to the lower connecting seat of the electronic testing machine; the second connector includes a second adapter. The second adapter includes a second fixing part and a second adapter part connected sequentially from bottom to top, and the diameter of the second fixing part is smaller than the diameter of the second adapter part; The second through hole is provided in the second fixing part; The second connector also includes a connecting post; The upper surface of the second adapter is provided with a second adapter hole, which is an internal thread hole; The bottom inner circumferential wall of the sleeve is provided with internal threads; The upper and lower ends of the connecting column are provided with external threads on their outer peripheral walls; the upper and lower ends of the connecting column are respectively threaded to the sleeve and the second adapter hole; the upper surface of the connecting column is a placement surface, which is perpendicular to the vertical direction. A protrusion is provided between the external threads at the upper and lower ends of the connecting column, and the protrusion is arranged around the outer peripheral wall of the connecting column and extends outward. The outer peripheral wall of the protrusion has two opposing and parallel gripping surfaces; The sleeve is provided with a test cavity extending through its upper and lower surfaces; the sleeve is detachably connected to the second connector; the top of the second connector has a placement surface for placing a compression spring, and the placement surface is located inside the test cavity; The pressure head is detachably connected to the first connector and can be movably inserted into the test chamber; The diameter of the pressure head is larger than the diameter of the compression spring.

2. The compression performance testing fixture for a compression spring as described in claim 1, characterized in that, The first connector includes a first adapter; The first adapter includes a first fixing part and a first adapter part connected sequentially from top to bottom, and the diameter of the first fixing part is smaller than the diameter of the first adapter part; The first through hole is provided in the first fixing part.

3. The compression performance testing fixture for compression springs as described in claim 2, characterized in that, The first connector also includes a first fixing plate, which has a first fixing hole penetrating its upper and lower surfaces. The first fixing hole is an internal threaded hole. The first fixing part has an external thread on its outer peripheral wall below the first through hole, and the first fixing plate is sleeved on the outer periphery of the first fixing part and threadedly connected to the first fixing part. The diameter of the first fixing plate is larger than the diameter of the upper connecting seat of the electronic testing machine.

4. The compression performance testing fixture for a compression spring as described in claim 2, characterized in that, The lower surface of the first adapter is provided with a first adapter hole, which is an internal thread hole; The top outer circumference of the pressure head is provided with an external thread, and the pressure head is threadedly connected to the first adapter hole.

5. The compression performance testing fixture for a compression spring as described in claim 1, characterized in that, The second connector also includes a second fixing plate, which has a second fixing hole penetrating its upper and lower surfaces. The second fixing hole is an internal threaded hole. The second fixing part has an external thread on its outer peripheral wall above the second through hole, and the second fixing plate is sleeved on the outer periphery of the second fixing part and threadedly connected to the second fixing part; The diameter of the second fixing plate is larger than the diameter of the lower connecting seat of the electronic testing machine.

6. A method for testing the compression performance of a compression spring, characterized in that, The compression performance test is performed using the compression performance test fixture of the compression spring as described in any one of claims 1-5, including the following steps: S1. Connect the first connector to the upper connector of the electronic testing machine; S2. Connect the second connector to the lower connector of the electronic testing machine; S3. Insert the compression spring to be tested into the sleeve and place it on the placement surface; S4. Zero the displacement and load of the electronic testing machine; S5. Use an electronic testing machine to drive the pressure head downwards, so that the pressure head abuts against the compression spring; S6. Using an electronic testing machine to apply constant speed loading, drive the pressure head to move downward; S7. Compress the compression spring to the predetermined deformation amount and stop the electronic testing machine from loading; S8. Based on the load and deformation of the compression spring obtained from the test, the compression performance of the compression spring is determined.

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