A spring pressure testing machine with a core shaft positioning mechanism

Abstract

The present invention relates to the technical field of spring pressure testing machines, and specifically to a spring pressure testing machine with a core shaft positioning mechanism, which solves the problem that when the spring pressure testing machine is in use, there is no way to position the axis of the spring being tested, which may cause the spring to be ejected from the equipment due to bending during the test, posing a great threat to the personal safety of the staff operating the equipment. A spring pressure testing machine with a core shaft positioning mechanism comprises a base, a spring placement plate is fixed to the upper surface of the base, an axis positioning mechanism is placed above the spring placement plate, and the axis positioning mechanism comprises a plurality of assembled circular plates. The present invention positions the axis of the spring through a guide rod, an inner positioning plate, a reset rod, and an outer positioning plate, thereby ensuring that the spring will not be displaced or bent in the middle during the pressure test, and preventing the spring from being ejected to the surroundings due to bending, thereby ensuring the personal safety of the staff operating the spring pressure testing machine.

Description

Technical Field

[0001] The invention relates to the technical field of spring pressure testing machines, in particular to a spring pressure testing machine with a core shaft positioning mechanism. Background Art

[0002] A spring is a mechanical part that uses elasticity to work. A part made of elastic material deforms under external force and returns to its original shape after the external force is removed. It is generally made of spring steel. There are many types of springs. According to their shapes, they mainly include helical springs, scroll springs, leaf springs, special-shaped springs, etc.

[0003] After the production of springs, the elastic limit of the springs needs to be tested. There are generally two types of spring tests, one is the tensile limit test of the spring, and the other is the compression limit test of the spring. The tensile test of the spring is carried out by a spring tensile testing machine, and the compression test of the spring is carried out by a spring pressure testing machine. Spring tensile testing machines and spring pressure testing machines are collectively referred to as spring tension and compression testing machines. Spring tension and compression testing machines are special instruments for testing the deformation and load relationship characteristics of tensile and compression springs. They are suitable for testing the working load of tensile and compression springs at a certain working length, and can also be used for elastic load testing of elastic devices such as rubber and reeds.

[0004] However, when the spring pressure testing machine is in use, there is no way to locate the axis of the spring being tested, which may cause the spring to pop out of the equipment due to bending during the test, posing a great threat to the personal safety of the staff operating the equipment; therefore, it does not meet the existing needs, and we have proposed a spring pressure testing machine with a core shaft positioning mechanism. Summary of the invention

[0005] The object of the present invention is to provide a spring pressure testing machine with a core shaft positioning mechanism to solve the problem that the spring pressure testing machine proposed in the above background technology cannot locate the axis of the spring being tested during use, resulting in the spring being bent and popped out of the equipment during the test, posing a great threat to the personal safety of the staff operating the equipment.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a spring pressure testing machine with a core shaft positioning mechanism, comprising a base, a spring placement plate is fixed on the upper surface of the base, an axis positioning mechanism is placed above the spring placement plate, the axis positioning mechanism comprises a plurality of assembly circular plates, the plurality of assembly circular plates are evenly spaced up and down, a magnet is fixedly embedded on the bottom surface of the assembly circular plate at the bottom, the assembly circular plate is fixed by magnetic adsorption to the spring placement plate by the magnet, a spring positioning block is fixed on the bottom of the assembly circular plate at the top and the upper surface of the assembly circular plate at the bottom, spring positioning blocks are fixed on the upper and lower surfaces of the remaining assembly circular plates, two connecting rings are installed between two upper and lower adjacent assembly circular plates, the connecting rings are fixed to the contacting assembly circular plates, a connecting rod is slidably installed between the two connecting rings, a supporting spring is installed on the inner side of the connecting ring, and two ends of the supporting spring are in contact with the two upper and lower adjacent assembly circular plates and cover the spring positioning blocks;

[0007] An adjusting motor and a rotating seat are fixed inside the assembling circular plate, the axis of the rotating seat coincides with the axis of the assembling circular plate, an adjusting gear is fixed to the outside of the bottom end of the rotating seat, a transmission gear is fixed to the output shaft end of the adjusting motor, the transmission gear is meshed with the adjusting gear, a plurality of fixing rods are fixed to the outer circular array of the assembling seat, an adjusting connecting plate is fixed to the outer end of the fixing rod, a guide rod is connected to the other end of the adjusting connecting plate, the guide rod passes through the side wall of the assembling circular plate and is slidably connected to the assembling circular plate, an inner positioning plate is fixed to the end of the guide rod located outside the assembling circular plate.

[0008] Preferably, the length dimension of the connecting rod is the sum of the thickness dimensions of the two connecting rings, and the inner positioning plate is arc-shaped and the center of the circle coincides with the axis of the assembled circular plate.

[0009] Preferably, the end of the guide rod located inside the assembling circular plate is provided with a docking groove, and the end of the adjusting connecting plate connected to the guide rod is slidably engaged in the docking groove.

[0010] Preferably, an adjustment slot is provided between the upper surface and the lower surface of the adjustment connecting plate, a sliding positioning rod is installed on the inner side of the adjustment slot, and the sliding positioning rod is fixed on the inner side of the docking groove.

[0011] Preferably, four outer positioning mechanisms are installed around the spring placement plate, and the four outer positioning mechanisms are distributed in a circular array around the axis of the spring placement plate.

[0012] Preferably, the outer positioning mechanism includes a fixed vertical plate, which is fixed to the surface of the base, and the surface of the fixed vertical plate is provided with a plurality of plug-in holes evenly spaced up and down, a reset rod is slidably inserted into the inner side of the plug-in hole, an outer positioning plate is fixed to the end of the reset rod pointing to the assembly circular plate, and a limiting plate is fixed to the other end of the fixed vertical plate.

[0013] Preferably, the upper end and the bottom end of the outer positioning plate are bent toward the fixed vertical plate, and the two ends of the outer positioning plate are bent into a V shape.

[0014] Preferably, a reset plate is fixed to the outside of the end portion of the reset rod connected to the outer positioning plate, a positioning spring is installed between the reset plate and the fixed vertical plate, and the positioning spring is sleeved on the outside of the reset rod.

[0015] Preferably, two symmetrical columns are fixed to the upper surface of the base, guide grooves are provided on the inner sides of the two columns, top plates are detachably installed on the top ends of the two columns, a lifting screw rod is installed on the inner side of the guide groove, the bottom end of the lifting screw rod is rotatably connected to the base, and the top end of the lifting screw rod passes through the top plate and is rotatably connected to the top plate.

[0016] Preferably, two motor fixing brackets are fixed to the upper surface of the top plate, a driving motor is fixed to the inner side of the motor fixing bracket, the output shaft end of the driving motor is fixed to the top end of the lifting screw rod, a lifting beam is slidably installed between the two columns, both ends of the lifting beam are penetrated by two lifting screw rods and are connected to the lifting screw rods by threads, and a downward pressure test plate is fixed to the bottom surface of the lifting beam.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention surrounds the assembly circular plate by placing the spring on the outside of the assembly circular plate, and drives the adjustment gear and the transmission gear to rotate after the adjustment motor is powered on, so that the rotating seat drives the fixed rod and the adjustment connecting plate to rotate counterclockwise. When the adjustment connecting plate rotates, it pushes the docking groove and the guide rod, so that the guide rod extends from the inside of the assembly circular plate, pushes the inner positioning plate and contacts the inner wall of the spring, until all the inner positioning plates are in contact with the spring. At this time, the guide rod and the inner positioning plate support the spring from the inside, and the axis of the spring coincides with the axis of the assembly circular plate and the spring placement plate, so as to realize the axial positioning of the spring, ensure that the spring will not be offset or bent in the middle during the pressure test, avoid the spring from being ejected to the surroundings due to bending, and ensure the personal safety of the staff operating the spring pressure testing machine;

[0019] 2. The present invention utilizes an adjusting motor to drive the transmission gear to rotate so that the adjusting gear drives the rotating seat to rotate, so that the rotating seat drives the adjusting connecting plate to rotate around the axis of the rotating seat through the fixed rod, and the position of the sliding positioning rod is adjusted by the rotating adjusting connecting plate, so that the guide rod is extended into the inside of the assembly circular plate or extended from the inside of the assembly circular plate, and the position of the inner positioning plate is changed, thereby axial positioning of springs with different diameters is performed;

[0020] 3. The present invention applies elastic force directed toward the assembled circular plate to the reset plate and the reset rod through the positioning spring, and squeezes the outer positioning plate against the outside of the spring positioned from the inside by the inner positioning plate, thereby fixing the position of the spring from the outside, further avoiding position displacement or bending of the spring during the pressure test, and ensuring safety during the pressure test. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the axis positioning mechanism of the present invention;

[0023] Figure 3 An exploded view of the structure of the assembled circular plate and the connecting ring of the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the assembled circular plate of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the adjusting connecting plate of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the rotating seat of the present invention;

[0027] Figure 7 A top view of the structure of the base of the present invention;

[0028] Figure 8 It is a structural schematic diagram of the outer positioning mechanism of the present invention;

[0029] Fig. 9 It is a structural cross-sectional view of the fixed vertical plate of the present invention.

[0030] In the figure: 1, base; 2, column; 3, top plate; 4, axis positioning mechanism; 401, assembly circular plate; 402, inner positioning plate; 403, guide rod; 404, connecting ring; 405, support spring; 406, spring positioning block; 407, connecting rod; 408, rotating seat; 409, adjusting connecting plate; 410, docking groove; 411, fixing rod; 412, adjusting slide groove; 413, adjusting motor; 414, adjusting gear; 415, transmission gear; 416, sliding positioning rod; 5, outer positioning mechanism; 501, fixed vertical plate; 502, reset rod; 503, reset plate; 504, limit plate; 505, positioning spring; 506, outer positioning plate; 507, plug-in hole; 6, guide groove; 7, lifting screw; 8, driving motor; 9, motor fixing frame; 10, lifting beam; 11, pressing test plate; 12, spring placement plate. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] The regulating motor (model 32ZYN01A) and the driving motor (model 110BHH) mentioned in the present invention can be purchased from the market or obtained through private customization.

[0033] like Figure 1 As shown, a spring pressure testing machine with a core shaft positioning mechanism is shown, two symmetrical columns 2 are fixed on the upper surface of the base 1, and guide grooves 6 are provided on the inner sides of the two columns 2. A top plate 3 is detachably installed on the top of the two columns 2, and a lifting screw rod 7 is installed on the inner side of the guide groove 6. The bottom end of the lifting screw rod 7 is rotatably connected to the base 1, and the top end of the lifting screw rod 7 passes through the top plate 3 and is rotatably connected to the top plate 3. Two motor fixing frames 9 are fixed on the upper surface of the top plate 3, and a driving motor 8 is fixed on the inner side of the motor fixing frame 9. The output shaft end of the driving motor 8 is fixed to the top of the lifting screw rod 7. A lifting beam 10 is slidably installed between the two columns 2, and the two ends of the lifting beam 10 are penetrated by the two lifting screw rods 7 and are connected to the lifting screw rods 7 by threads. A downward pressure test plate 11 is fixed to the bottom surface of the lifting beam 10, and the driving motor 8 is used to drive the lifting screw rod 7 to rotate, and the lifting screw rod 7 is used to control the up and down movement of the lifting beam 10 and the downward pressure test plate 11, and the downward moving downward pressure test plate 11 is used to perform a pressure test on the positioned spring.

[0034] like Figures 1 to 6As shown, a spring placement plate 12 is fixed on the upper surface of the base 1, and an axis positioning mechanism 4 is placed above the spring placement plate 12. The axis positioning mechanism 4 includes a plurality of assembly circular plates 401, and the plurality of assembly circular plates 401 are evenly spaced up and down. A magnet is fixedly embedded on the bottom surface of the assembly circular plate 401 at the bottom, and the assembly circular plate 401 is fixed to the spring placement plate 12 by magnetic adsorption by the magnet. A spring positioning block 406 is fixed on the bottom of the assembly circular plate 401 at the top and on the upper surface of the assembly circular plate 401 at the bottom, and spring positioning blocks 406 are fixed on the upper and lower surfaces of the remaining assembly circular plates 401. The upper and lower surfaces of the two adjacent assembly circular plates 401 are fixed together. Two connecting rings 404 are installed between the assembled circular plates 401, and the connecting rings 404 are fixed to the contacted assembled circular plates 401, and a connecting rod 407 is slidably installed between the two connecting rings 404. A supporting spring 405 is installed on the inner side of the connecting ring 404, and both ends of the supporting spring 405 are in contact with the two upper and lower adjacent assembled circular plates 401 and cover the spring positioning block 406. The spring positioning block 406, the connecting ring 404 and the connecting rod 407 are used to isolate and support the two upper and lower adjacent assembled circular plates 401, and ensure that the assembled circular plates 401 can move downward and contract after being subjected to pressure, without affecting the normal pressure test of the spring.

[0035] An adjusting motor 413 and a rotating seat 408 are fixed inside the assembly circular plate 401, and the axis of the rotating seat 408 coincides with the axis of the assembly circular plate 401. An adjusting gear 414 is fixed to the outer side of the bottom end of the rotating seat 408, and a transmission gear 415 is fixed to the output shaft end of the adjusting motor 413. The transmission gear 415 meshes with the adjusting gear 414. A plurality of fixing rods 411 are fixed to the outer circular array of the rotating seat 408, and an adjusting connecting plate 409 is fixed to the outer end of the fixing rod 411. The other end of the adjusting connecting plate 409 is connected to the guide rod 403. The guide rod 414 is fixed to the outer circular array of the rotating seat 408. 03 passes through the side wall of the assembling circular plate 401 and is slidably connected to the assembling circular plate 401. The end of the guide rod 403 located outside the assembling circular plate 401 is fixed with an inner positioning plate 402. The inner positioning plates 402 distributed in a circular array outside the assembling circular plate 401 are used to support and position the spring from the inside to ensure that the axis of the spring coincides with the axis of the downward pressure test plate 11 and the spring placement plate 12, to ensure that the spring does not bend during the pressure test, to prevent the spring from popping out from between the downward pressure test plate 11 and the spring placement plate 12 due to bending, and to ensure safety during the pressure test.

[0036] The length of the connecting rod 407 is the sum of the thicknesses of the two connecting rings 404. The inner positioning plate 402 is arc-shaped and the center of the circle coincides with the axis of the assembled circular plate 401, ensuring that the support spring 405 between the two assembled circular plates 401 will not be damaged due to the pressure of the two assembled circular plates 401 during contact, and ensuring that all the assembled circular plates 401 can be reset normally after the pressure test is completed.

[0037] The end of the guide rod 403 located inside the assembly circular plate 401 is provided with a docking groove 410, and the end of the adjusting connecting plate 409 connected to the guide rod 403 is slidably engaged in the docking groove 410, and an adjusting slide groove 412 is provided between the upper surface and the lower surface of the adjusting connecting plate 409, and a sliding positioning rod 416 is installed on the inner side of the adjusting slide groove 412, and the sliding positioning rod 416 is fixed on the inner side of the docking groove 410. The adjusting motor 413 is used to drive the rotating seat 408 to rotate, so that the rotating seat 408 drives the adjusting connecting plate 409 to rotate around the axis of the rotating seat 408 through the fixed rod 411, and the position of the sliding positioning rod 416 is adjusted by the rotating adjusting connecting plate 409, so that the guide rod 403 is retracted into the assembly circular plate 401 or extended from the assembly circular plate 401, thereby changing the position of the inner positioning plate 402, thereby axially positioning the springs of different diameters.

[0038] like Figure 1 , Figures 7 to 9 As shown, four outer positioning mechanisms 5 are installed around the spring placement plate 12, and the four outer positioning mechanisms 5 are distributed in a circular array around the axis of the spring placement plate 12. The outer positioning mechanism 5 includes a fixed vertical plate 501, and the angle between the fixed vertical plate 501 and the side of the lifting beam 10 is forty-five degrees. The fixed vertical plate 501 is fixed to the surface of the base 1, and the surface of the fixed vertical plate 501 is provided with a plurality of plug holes 507 distributed at equal intervals up and down, and a reset rod 502 is slidably inserted into the inner side of the plug hole 507. The end of the reset rod 502 pointing to the assembly circular plate 401 is fixed with an outer positioning plate 506, and the other end of the fixed vertical plate 501 is fixed with a limiting plate 504. The outer positioning plate 506 is used to position the spring to be tested from the outside, so as to further ensure that the spring remains stable and does not bend during the test.

[0039] The upper and lower ends of the outer positioning plate 506 are bent toward the fixed vertical plate 501, and the two ends of the outer positioning plate 506 are bent into a V-shape. When the outer positioning plate 506 with the V-shaped upper and lower ends is squeezed, the outer positioning plate 506 can move the reset rod 502 toward the fixed vertical plate 501, so that the object squeezing the outer positioning plate 506 can move downward smoothly, ensuring that the outer positioning plate 506 will not hinder the progress of the test.

[0040] A reset plate 503 is fixed to the outside of the end where the reset rod 502 is connected to the outer positioning plate 506, and a positioning spring 505 is installed between the reset plate 503 and the fixed vertical plate 501. The positioning spring 505 is sleeved on the outside of the reset rod 502. The elasticity of the positioning spring 505 is used to adjust the position of the reset rod 502 and the outer positioning plate 506, so that the outer positioning plate 506 is always in contact with the outside of the spring being pressure tested, and the spring being pressure tested is always positioned.

[0041] Working principle: Place the spring to be pressure tested on the surface of the spring placement plate 12, and ensure that the spring is sleeved on the outside of all the inner positioning plates 402, and then turn on the power of the adjusting motor 413 inside the assembly circular plate 401, so that the adjusting motor 413 drives the adjusting gear 414 and the transmission gear 415 to rotate, so that the adjusting gear 414 drives the rotating seat 408 to rotate counterclockwise, and the rotating seat 408 drives the adjusting connecting plate 409 to rotate through the fixed rod 411 during the rotation, and the adjusting connecting plate 409 generates a thrust on the docking groove 410 when rotating, so that the docking groove 410 drives the guide rod 403 to extend from the inside of the assembly circular plate 401, and makes the inner positioning plate 402 approach the inner wall of the spring until all the inner positioning plates 402 are in contact with the spring, at which time the axis of the spring supported from the inside by the adjusting slide groove 412 coincides with the axis of the assembly circular plate 401 and the spring placement plate 12;

[0042] Then, the outer positioning plate 506 is loosened, so that the positioning spring 505 between the reset plate 503 and the fixed vertical plate 501 is elastically reset, and the positioning spring 505 applies a force directed to the spring to the reset plate 503, the reset rod 502, and the outer positioning plate 506, so that the outer positioning plate 506 is squeezed to the outside of the spring, and the spring is fixed in position from the outside of the spring by using the outer positioning plate 506. Next, the drive motor 8 is energized and started. After the drive motor 8 is started, it drives the lifting screw 7 to rotate, and the Shudie lifting screw 7 drives the lifting beam 1 0. The downward pressure test plate 11 moves downward, so that the downward pressure test plate 11 contacts the top of the spring and presses the spring downward. After the spring is compressed, when the downward pressure test plate 11 contacts the assembly circular plate 401 and the inner positioning plate 402, the assembly circular plate 401 moves downward with the downward pressure test plate 11 and compresses the support spring 405 until the two connecting rings 404 between the upper and lower adjacent assembly circular plates 401 contact each other and cover the connecting rod 407. During this process, the inner positioning plate 402 always supports the spring from the inside.

[0043] When the downward pressure test plate 11 descends and contacts the outer positioning plate 506, since the upper and lower ends of the outer positioning plate 506 are bent toward the fixed vertical plate 501 and are V-shaped, when the downward pressure test plate 11 contacts the outer positioning plate 506, the outer positioning plate 506 moves toward the fixed vertical plate 501 due to the squeezing of the downward pressure test plate 11, so that the positioning spring 505 is compressed. At this time, the downward pressure test plate 11 smoothly passes through the outer positioning plate 506 and continues to move downward. The remaining outer positioning plates 506 continue to support the spring from the outside, and the axis of the spring is positioned by the guide rod 403, the inner positioning plate 402, the reset rod 502, and the outer positioning plate 506 to ensure that the spring will not be displaced or bent in the middle during the pressure test, to prevent the spring from being ejected to the surroundings due to bending, and to ensure the personal safety of the staff operating the spring pressure testing machine.

[0044] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A spring pressure testing machine with a core shaft positioning mechanism, comprising a base (1), characterized in that: A spring placement plate (12) is fixed to the upper surface of the base (1), an axis positioning mechanism (4) is placed above the spring placement plate (12), and the axis positioning mechanism (4) comprises a plurality of assembly circular plates (401), the plurality of assembly circular plates (401) are evenly spaced up and down, a magnet is fixedly embedded on the bottom surface of the assembly circular plate (401) at the bottom, the assembly circular plate (401) is fixed to the spring placement plate (12) by magnetic adsorption through the magnet, and a spring positioning block (401) is fixed to the bottom of the assembly circular plate (401) at the top and the upper surface of the assembly circular plate (401) at the bottom. 06), the upper and lower surfaces of the remaining assembly circular plates (401) are fixed with spring positioning blocks (406), two connecting rings (404) are installed between the two upper and lower adjacent assembly circular plates (401), the connecting rings (404) are fixed to the contacting assembly circular plates (401), a connecting rod (407) is slidably installed between the two connecting rings (404), a supporting spring (405) is installed on the inner side of the connecting ring (404), and both ends of the supporting spring (405) are in contact with the two upper and lower adjacent assembly circular plates (401) and cover the spring positioning blocks (406); An adjusting motor (413) and a rotating seat (408) are fixed inside the assembly circular plate (401), the axis of the rotating seat (408) coincides with the axis of the assembly circular plate (401), an adjusting gear (414) is fixed on the outside of the bottom end of the rotating seat (408), a transmission gear (415) is fixed on the output shaft end of the adjusting motor (413), and the transmission gear (415) meshes with the adjusting gear (414), a plurality of fixing rods (411) are fixed in a circular array on the outside of the rotating seat (408), an adjusting connecting plate (409) is fixed on the outer end of the fixing rod (411), the other end of the adjusting connecting plate (409) is connected to a guide rod (403), the guide rod (403) passes through the side wall of the assembly circular plate (401) and is slidably connected to the assembly circular plate (401), and an inner positioning plate (402) is fixed to the end of the guide rod (403) located outside the assembly circular plate (401); The length dimension of the connecting rod (407) is the sum of the thickness dimensions of the two connecting rings (404); the inner positioning plate (402) is arc-shaped and the center of the circle coincides with the axis of the assembled circular plate (401); The end of the guide rod (403) located inside the assembly circular plate (401) is provided with a docking groove (410), and the end of the adjustment connecting plate (409) connected to the guide rod (403) is slidably engaged in the docking groove (410); Four outer positioning mechanisms (5) are installed around the spring placement plate (12), and the outer positioning mechanism (5) includes a fixed vertical plate (501), the fixed vertical plate (501) is fixed to the surface of the base (1), and the surface of the fixed vertical plate (501) is provided with a plurality of plug holes (507) distributed at equal intervals up and down, and a reset rod (502) is slidably inserted into the inner side of the plug hole (507), and an outer positioning plate (506) is fixed to the end of the reset rod (502) pointing to the assembly circular plate (401), and a limit plate (504) is fixed to the other end of the fixed vertical plate (501); The upper end and the bottom end of the outer positioning plate (506) are both bent towards the fixed vertical plate (501), and the two ends of the outer positioning plate (506) are bent into a V shape.

2. A spring pressure testing machine with a core shaft positioning mechanism according to claim 1, characterized in that: An adjustment slot (412) is provided between the upper surface and the lower surface of the adjustment connecting plate (409), a sliding positioning rod (416) is installed on the inner side of the adjustment slot (412), and the sliding positioning rod (416) is fixed on the inner side of the docking groove (410).

3. A spring pressure testing machine with a core shaft positioning mechanism according to claim 1, characterized in that: The four outer positioning mechanisms (5) are distributed in a circular array around the axis of the spring placement plate (12).

4. A spring pressure testing machine with a core shaft positioning mechanism according to claim 1, characterized in that: A reset plate (503) is fixed to the outside of the end portion of the reset rod (502) connected to the outer positioning plate (506), a positioning spring (505) is installed between the reset plate (503) and the fixed vertical plate (501), and the positioning spring (505) is sleeved on the outside of the reset rod (502).

5. A spring pressure testing machine with a core shaft positioning mechanism according to claim 4, characterized in that: Two symmetrical columns (2) are also fixed on the upper surface of the base (1), the inner sides of the two columns (2) are provided with guide grooves (6), the top ends of the two columns (2) are detachably mounted with a top plate (3), the inner sides of the guide grooves (6) are mounted with a lifting screw rod (7), the bottom end of the lifting screw rod (7) is rotatably connected to the base (1), and the top end of the lifting screw rod (7) passes through the top plate (3) and is rotatably connected to the top plate (3).

6. A spring pressure testing machine with a core shaft positioning mechanism according to claim 5, characterized in that: Two motor fixing frames (9) are fixed on the upper surface of the top plate (3), a driving motor (8) is fixed on the inner side of the motor fixing frame (9), an output shaft end of the driving motor (8) is fixed to the top end of the lifting screw rod (7), a lifting beam (10) is slidably installed between the two uprights (2), two ends of the lifting beam (10) are penetrated by the two lifting screw rods (7) and are connected to the lifting screw rods (7) by threads, and a downward pressure test plate (11) is fixed to the bottom surface of the lifting beam (10).

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