Valve spring assembly fixture and method

Abstract

The application discloses a valve spring assembly clamp, which comprises a base, a positioning seat and a guide mechanism, the base is provided with a groove, the first end of the positioning seat is in the groove, the bottom of the positioning seat and the side surface and the bottom surface of the groove form a sealed cavity for storing hydraulic oil, the base is provided with an oil supply hole in communication with the cavity, the oil supply hole is provided with a plugging body one, the second end of the positioning seat is provided with a positioning unit for positioning a valve plug, the guide mechanism is in interference fit at the end of the second end of the positioning seat, the guide mechanism is internally provided with a spring mounting head for spring positioning, one end of the spring mounting head is a conical structure, the conical angle of the conical structure is consistent with the spiral taper of the spring, the other end is provided with an elastic assembly, and the central axis of the spring mounting head is collinear with the central axis of the positioning unit. The application further discloses a valve spring assembly method. The application can solve the technical problem of difficult valve spring installation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine valve, in particular to a valve spring assembly clamp. Furthermore, the present application also relates to a method for using the valve spring assembly clamp. BACKGROUND

[0002] The aero-engine valve usually contains components such as spring and valve plug, and during the assembly process, the spring and the valve plug need to be assembled into one body (such as Figure 1 ). Among them, the spring is a spiral structure, one end of which has a larger diameter than the other end; and one end of the valve plug is a spherical surface, and the other end is a small cylindrical surface. Since the small end diameter of the spring is smaller than the installation cylindrical surface of the valve plug, an external force needs to be applied to deform the spring during installation, so that it is clamped on the small cylindrical surface of the valve to become one body, and in order to ensure the tightness of the interference fit between the two, the process requires a fixed pressure to be applied to the spring during installation and maintained for a period of time.

[0003] The difficulty of valve spring installation is that the valve and spring are very small, such as Figure 1 In the example, the outer circle of the valve plug is only 7mm, and the diameter of the installation cylindrical surface of the spring is only 3.3mm, and the height is only 1.5mm, so it is very difficult to use a clamp and other tools for manual operation; secondly, during the installation process, the pressure needs to be measured, and the use of a press for pressure assembly can meet this requirement, but due to the small size of the object parts, it is difficult to fix the position, and the spring is deformed under stress without being constrained, so it is very easy for the spring to deviate from the target. SUMMARY

[0004] The present application provides a valve spring assembly clamp and method to solve the technical problem of existing valve spring installation difficulty.

[0005] According to one aspect of the present application, a valve spring assembly clamp is provided for the assembly of a spring and a valve plug in a valve, comprising a base, a positioning seat and a guide mechanism, the base is provided with a groove, the first end of the positioning seat is in the groove, and the bottom of the positioning seat and the side and bottom surfaces of the groove form a sealed cavity for storing hydraulic oil, the base is provided with an oil supply hole communicating with the cavity, the oil supply hole is provided with a plugging body one, the second end of the positioning seat is provided with a positioning unit for positioning the valve plug, the guide mechanism is installed in interference fit at the end of the second end of the positioning seat, the positioning unit is arranged at the connection between the positioning seat and the guide mechanism, the guide mechanism is provided with a spring installation head inside for positioning the spring, one end of the spring installation head is a conical structure, the conical angle of the conical structure is consistent with the spiral taper of the spring, the other end is provided with an elastic assembly, and the center axis of the spring installation head is collinear with the center axis of the positioning unit.

[0006] Further, the guide mechanism comprises a guide sleeve and a guide column, one end of the guide sleeve is in interference fit with the positioning seat, the other end is provided with a placing hole, the guide column is in clearance fit in the placing hole, the guide column is provided with a through hole one for providing a spring mounting head conical structure movement space and a through hole two for providing an elastic component movement space, the spring mounting head conical structure end extends out of the through hole one and extends to the positioning unit, the non-conical structure end of the spring mounting head is in clearance fit in the through hole two, the spring sleeve is arranged on the conical structure of the spring mounting head, the large diameter end of the spring is close to the guide column, and the inner diameter of the large diameter end of the spring is larger than the inner diameter of the through hole one.

[0007] Further, the elastic component comprises an elastic body and a blocking body two for adjusting the pre-tightness of the elastic body, preferably, the blocking body two is arranged in the through hole two, the position of the blocking body two in the through hole two is adjustable, and the elastic body is arranged between the spring mounting head and the blocking body two.

[0008] Further, a fixing part one for preventing the guide column from rotating circumferentially is arranged between the guide sleeve and the guide column, a guide groove one for providing an end part movement space of the fixing part one is arranged on the right side of the guide column, one end of the fixing part one is fixed in the guide sleeve, and the other end is located in the guide groove one; or a guide groove two for providing an end part linear movement space of the fixing part one is arranged on the guide sleeve, and a hole or a groove for fixing the end part of the fixing part one is arranged on the guide column.

[0009] Further, a matching protrusion is arranged on the positioning seat, a matching groove is arranged on the guide sleeve, the matching groove is in communication with the placing hole, the center axis of the matching groove is collinear with the center axis of the placing hole, the diameter of the matching groove is larger than the diameter of the placing hole, and the matching groove is in interference fit connection with the matching protrusion.

[0010] Further, a plurality of groups of annular grooves are arranged on the outer peripheral wall of the positioning seat which is attached to the base, and a sealing part one is arranged in the annular groove.

[0011] Further, a mounting hole is arranged on the base, a hydraulic gauge extending into the cavity is arranged in the mounting hole, the hydraulic gauge is used to measure the pressure, during assembly, the oil pressure in the cavity can be measured by the hydraulic gauge to adjust the size of the installation pressure, so that the requirement of different numerical pressure required by the process can be met, a sealing part two is arranged outside the mounting hole, and a fixing part two for fixing the hydraulic gauge is arranged outside the sealing part two.

[0012] Further, the base is further provided with a mounting groove for fixing the base on a hydraulic press or a manual spinning press, so that the clamp can be used on the hydraulic press and the manual spinning press at the same time, and the clamp has strong universality.

[0013] Further, the positioning unit comprises a positioning groove, which is in consistent with the arc-shaped end face of the valve plug in shape and size.

[0014] According to another aspect of the present application, there is also provided a valve spring assembling method comprising the valve spring assembling jig described above, and specifically comprising the following steps:

[0015] S1, injecting hydraulic oil into the cavity through the oil supply hole;

[0016] S2, placing the valve plug at the positioning unit for centering;

[0017] S3, setting the spring sleeve outside the conical structure of the spring mounting head for centering;

[0018] S4, applying pressure to the end of the guide mechanism, the guide mechanism drives the elastic assembly and the positioning seat to move together and compresses the cavity to increase the oil pressure in the cavity, when the oil pressure in the cavity is greater than the pre-pressure of the elastic assembly, the pressure is continuously increased to make the guide mechanism continue to move and the elastic assembly is compressed, the end of the spring is always aligned with and in contact with the mounting surface of the valve plug, the end surface of the guide mechanism applies pressure to the large end of the spring diameter, and the mounting surface of the valve plug applies pressure to the small end of the spring diameter, so that the small end of the spring diameter is increased to be sleeved into the mounting surface of the valve plug, and the assembly of the spring and the valve plug is completed.

[0019] The present application has the following beneficial effects:

[0020] (1) The jig and method of the present application can position the valve plug through the positioning unit on the positioning seat, position the spring through the spring mounting head, and guide the spring through the guide mechanism, so as to ensure that the spring and the mounting surface of the valve plug are in the correct position and prevent deviation, and effectively solve the problem of difficult manual operation and difficult position fixing due to the small size of the object part in the prior art;

[0021] (2) The jig and method of the present application can make the spring mounting head move according to the guidance of the guide mechanism through the guidance of the guide mechanism, and further make the spring positioned on the spring mounting head be compressed in the movement direction of the guide mechanism, so as to effectively solve the problem of spring deviation caused by the unconstrained deformation of the spring under stress in the prior art;

[0022] (3) The clamp and method of the present application can facilitate the spring installation head driving the spring to move together by only pressing the guide mechanism, realize the effect of the guide mechanism pressing the large end of the spring diameter and the installation surface of the valve plug pressing the small end of the spring diameter at the same time, finally realize the deformation of the small end of the spring diameter, and then the purpose of sleeving into the installation surface of the valve plug, can be used with a hydraulic press or a manual spinning press, facilitates the realization of mass production and mechanized production process, and the clamp positioning of the present application is more accurate than manual operation and has higher operability;

[0023] (4) The clamp and method of the present application make the center axis of the spring installation head and the center axis of the positioning unit collinear, facilitate the center alignment of the small end of the spring diameter and the installation surface of the valve plug, and make the spring installation head drive the spring to maintain a straight motion state during compression, avoid the bending deformation of the spring along the center to cause the displacement of the spring and fail to install; in addition, when the spring and the valve plug are assembled, the pressure is applied to the small end of the spring diameter from both ends of the spring to make the small end of the spring diameter expand and deform, so that the spring is more easily assembled with interference, and has higher reliability and better stability.

[0024] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate embodiments of the application and assist in the explanation of the application. In the drawings:

[0026] Figure 1 is a structure schematic view of the valve of the preferred embodiment 1 (2) of the present application;

[0027] Figure 2 is a structure sectional view of the valve spring assembly clamp of the preferred embodiment 1 of the present application;

[0028] Figure 3 is a structure schematic view of the force process of the valve spring assembly clamp of the preferred embodiment 1 of the present application;

[0029] Figure 4 is a structure schematic view of the guide mechanism in the preferred embodiment 2 of the present application.

[0030] LEGEND:

[0031] 1. Spring; 2. Valve plug; 3. Base; 31. Groove; 32. Oil supply hole; 33. Sealing body one; 34. Mounting hole; 35. Seal two; 36. Fixing part two; 37. Mounting groove; 4. Positioning seat; 41. Positioning unit; 42. Mating protrusion; 43. Annular groove; 44. Seal one; 5. Guide mechanism; 51. Guide sleeve; 511. Placement hole; 512. Guide groove two; 513. Mating groove; 52. Guide post; 521. Through hole one; 522. Through hole two; 523. Guide groove one; 6. Cavity; 7. Spring mounting head; 8. Elastic component; 81. Elastic body; 82. Sealing body two; 9. Fixing part one; 10. Hydraulic gauge. Detailed Implementation

[0032] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0033] Example 1:

[0034] like Figures 1 to 4 As shown, this embodiment of a valve spring assembly fixture is used for assembling spring 1 and valve plug 2 in a valve. It includes a base 3, a positioning seat 4, and a guide mechanism 5. The base 3 has a groove 31, and the first end of the positioning seat 4 is located within the groove 31. The bottom of the positioning seat 4, together with the side and bottom surfaces of the groove 31, forms a sealed cavity 6 for storing hydraulic oil. The base 3 has an oil supply hole 32 communicating with the cavity 6. A sealing body 33 is provided inside the oil supply hole 32, allowing switching between the oil injection process and the sealing process of the oil supply hole 32. The second end of the positioning seat 4 is provided with a mechanism for the valve plug 2. The positioning unit 41 and the guide mechanism 5 are interference-fitted at the end of the second end of the positioning seat 4. The interference fit facilitates the quick placement of the spring 1 and the valve plug 2 in their respective positioning positions and the quick removal of the assembled valve from the fixture. The positioning unit 41 is located at the connection between the positioning seat 4 and the guide mechanism 5. The guide mechanism 5 has a spring mounting head 7 for positioning the spring 1 inside. One end of the spring mounting head 7 is a conical structure with the cone angle consistent with the helical taper of the spring 1. The other end is provided with an elastic component 8. The central axis of the spring mounting head 7 is collinear with the central axis of the positioning unit 41.

[0035] In this embodiment, the valve spring assembly fixture can position the valve plug 2 through the positioning unit 41 on the positioning seat 4, position the spring 1 through the spring mounting head 7, and guide the spring 1 through the guide mechanism 5. This ensures that the mounting surfaces of the spring 1 and the valve plug 2 are in the correct positions and prevents deviation. It can effectively solve the problems in the prior art where manual operation is difficult and the position is difficult to fix due to the small size of the object parts.

[0036] The valve spring assembly clamp of the embodiment can effectively solve the problem that the spring 1 deviates from the target due to the force deformation of the spring 1 without constraint in the prior art, by the arrangement of the guide mechanism 5, the arrangement of the spring mounting head 7 in the guide mechanism 5, the movement of the spring mounting head 7 according to the guide of the guide mechanism 5, and the compression of the spring 1 in the movement direction of the guide mechanism 5.

[0037] The valve spring assembly clamp of the embodiment can effectively solve the problem that the spring 1 deviates from the target due to the force deformation of the spring 1 without constraint in the prior art, by the arrangement of the guide mechanism 5, the arrangement of the spring mounting head 7 in the guide mechanism 5, the movement of the spring mounting head 7 according to the guide of the guide mechanism 5, and the compression of the spring 1 in the movement direction of the guide mechanism 5.

[0038] The valve spring assembly clamp of the embodiment can effectively solve the problem that the spring 1 deviates from the target due to the force deformation of the spring 1 without constraint in the prior art, by the arrangement of the guide mechanism 5, the arrangement of the spring mounting head 7 in the guide mechanism 5, the movement of the spring mounting head 7 according to the guide of the guide mechanism 5, and the compression of the spring 1 in the movement direction of the guide mechanism 5.

[0039] In the embodiment, the guide mechanism 5 comprises a guide sleeve 51 and a guide column 52. One end of the guide sleeve 51 is in interference fit with the positioning seat 4, and the other end is provided with a placement hole 511. The guide column 52 is in clearance fit in the placement hole 511. The clearance fit ensures that the guide column 52 can slide up and down in the guide sleeve 51. The guide column 52 is provided with a through hole one 521 for providing a conical structure movement space of the spring mounting head 7 and a through hole two 522 for providing a movement space of the elastic assembly 8. The end of the spring mounting head 7 with the conical structure extends out of the through hole one 521 and extends to the positioning unit 41. The end of the spring mounting head 7 with the non-conical structure is in clearance fit in the through hole two 522. The clearance fit ensures that the end of the spring mounting head 7 with the non-conical structure can slide relative to the guide column 52. The spring 1 is sleeved on the conical structure of the spring mounting head 7. The lower end of the spring mounting head 7 has a conical angle consistent with the helical taper of the spring 1, which can effectively center the spring 1 and enable the spring 1 to move together with the spring mounting head 7. The large-diameter end of the spring 1 is close to the guide column 52. The inner diameter of the large-diameter end of the spring 1 is greater than the inner diameter of the through hole one 521, which ensures that the guide column 52 will contact the large-diameter end of the spring 1 and compress the spring 1 along the large-diameter end of the spring 1 during downward movement.

[0040] In the embodiment, the elastic assembly 8 comprises an elastic body 81 and a blocking body two 82 for adjusting the pre-tightness of the elastic body 81. The blocking body two 82 is arranged in the through hole two 522. The position of the blocking body two 82 in the through hole two 522 is adjustable. The blocking body two 82 prevents the elastic body 81 from being ejected by clamping the elastic body 81 in the through hole two 522. Preferably, the blocking body two 82 is threadedly connected in the through hole two 522. The pre-tightness of the elastic body 81 can be adjusted by adjusting the up-down position of the blocking body two 82 in the through hole two 522. Before formal work, the spring mounting head 7 is in the initial position at the lowermost end to realize the positioning effect on the spring 1. The elastic body 81 is arranged between the spring mounting head 7 and the blocking body two 82. The elastic body 81 can be any structure capable of storing elastic pressure in the prior art, such as a spring structure, a porous rubber structure, etc.

[0041] In the embodiment, a fixing member one 9 is arranged between the guide sleeve 51 and the guide column 52 to prevent the guide column 52 from rotating circumferentially. The right side of the guide column 52 is provided with a guide groove one 523 for providing a movement space for the end of the fixing member one 9. One end of the fixing member one 9 is fixed in the guide sleeve 51, and the other end is located in the guide groove one 523. When the guide column moves up and down, the guide groove one 523 moves up and down relative to the end of the fixing member one 9.

[0042] In the embodiment, the positioning seat 4 is provided with a matching protrusion 42, the guide sleeve 51 is provided with a matching groove 513, the matching groove 513 is communicated with the placing hole 511, the center axis of the matching groove 513 is collinear with the center axis of the placing hole 511, the diameter of the matching groove 513 is larger than the diameter of the placing hole 511, and the matching groove 513 is connected to the matching protrusion 42 in an interference fit, so as to ensure that the protrusion 42 cannot enter the placing hole 511.

[0043] In the embodiment, the outer peripheral wall of the positioning seat 4 that is attached to the base 3 is provided with two groups of annular grooves 43, and the annular grooves 43 are provided with sealing members one 44. The sealing members one 44 can be rubber sealing ring structures.

[0044] In the embodiment, the base 3 is provided with a mounting hole 34, and the mounting hole 34 is provided with a hydraulic gauge 10 that extends into the cavity 6. The hydraulic gauge 10 is used to measure pressure. During assembly, the oil pressure in the cavity 6 can be measured by the hydraulic gauge 10, so as to adjust the size of the installation pressure. The installation pressure can meet the requirements of different numerical values of pressure required by the process. The outside of the mounting hole 34 is provided with a sealing member two 35, which can be a rubber pad structure. The outside of the sealing member two 35 is provided with a fixing member two 36 for fixing the hydraulic gauge. The fixing member two 36 can be an outer hexagonal nut.

[0045] In the embodiment, the base 3 is further provided with a mounting groove 37 for fixing the base 3 on a hydraulic press or a manual spinning press. The clamp can be used on both the hydraulic press and the manual spinning press, and has strong versatility.

[0046] In the embodiment, the positioning unit 41 includes a positioning groove. The shape and size of the positioning groove are consistent with the arc-shaped end surface of the valve plug 2. Since the length of the cylindrical surface part (the mounting surface of the valve plug 2) of the valve plug 2 is very small, the arc-shaped end surface part of the valve plug 2 is placed in the positioning groove, and the cylindrical surface part of the valve plug 2 is vertically upward, so as to realize the positioning of the entire valve plug 2.

[0047] The specific working principle of the valve spring assembly clamp in the embodiment is as follows:

[0048] As Figure 4As shown, first, the valve plug 2 and the spring 1 are positioned and centered on the positioning groove and the spring mounting head 7 (the spring 1 is sleeved on the outside of the conical structure of the lower part of the spring mounting head 7) of the positioning seat 3 respectively, and then pressure is applied to the upper end surface of the guide column 52, the guide column 52, the elastic assembly 8 and the spring mounting head 7 move downward together, the lower end of the spring mounting head 7 and the small-diameter end of the spring 1 first contact the mounting surface of the valve plug 2, and then the positioning seat 4 moves downward together with the above-mentioned components under pressure and the oil pressure in the cavity 6 is increased. When the oil pressure in the cavity 6 is greater than the pre-pressure of the elastic assembly 8, the pressure is continuously increased to make the guide column 52 move downward alone, the lower end surface of the guide column 52 contacts the large-diameter end of the spring 1 and exerts pressure on the spring 1 to deform the spring 1. At this time, due to the action of the oil pressure, the mounting surface of the valve plug 2 also exerts pressure on the small-diameter end of the spring 1 to increase the diameter of the small-diameter end of the spring 1, so that the small-diameter end of the spring 1 is easily sleeved into the mounting surface of the valve plug 2. During the assembly process, the oil pressure in the cavity can be measured by the hydraulic pressure gauge 10 to adjust the size of the mounting pressure to meet the requirements of the press-fitting process.

[0049] The embodiment also provides a valve spring assembly method, which comprises the valve spring assembly clamp and specifically comprises the following steps.

[0050] S1, injecting a suitable volume of hydraulic oil into the cavity 6 through the oil supply hole 32;

[0051] S2, centering the valve plug 2 by placing it at the positioning unit 41;

[0052] S3, centering the spring 1 by sleeving it outside the conical structure of the spring mounting head 1;

[0053] S4, exerting pressure on the end of the guide mechanism 5, the guide mechanism 5 drives the elastic assembly 8 and the positioning seat 4 to move together and compresses the cavity 6 to increase the oil pressure in the cavity 6. When the oil pressure in the cavity 6 is greater than the pre-pressure of the elastic assembly 8, the pressure is continuously increased to make the guide mechanism 5 continue to move and the elastic assembly 8 be compressed, the end of the spring 1 is always aligned with and in contact with the mounting surface of the valve plug 2, the end surface of the guide mechanism 5 exerts pressure on the large-diameter end of the spring 1, and the mounting surface of the valve plug 2 exerts pressure on the small-diameter end of the spring 1 to increase the diameter of the small-diameter end of the spring 1 so that the small-diameter end of the spring 1 is sleeved into the mounting surface of the valve plug 2, and the assembly of the spring 1 and the valve plug 2 is completed.

[0054] Embodiment 2:

[0055] As Figure 4As shown, the difference between the present embodiment and embodiment 1 is that the guide sleeve 51 is provided with a guide groove two 512 for providing a linear motion space for the end of the first fixing member 9, and the guide column 52 is provided with a hole or a groove for fixing the end of the first fixing member 9. The first fixing member 9 can be a screw, when the first fixing member 9 is a screw, the hole on the guide column 52 is a threaded hole, in other embodiments, the first fixing member 9 can also be a pin, when the first fixing member 9 is a pin, the hole on the guide column 52 is a pin hole. One end of the first fixing member 9 is fixed in the guide column 52, and the other end is in the guide groove two 512, since there is enough space in the guide groove two 512 for the end of the first fixing member 9 to move up and down linearly, the first fixing member 9 prevents the guide column 52 from moving circumferentially while not affecting the independent up and down movement of the guide column 52. The rest is the same as embodiment 1.

[0056] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A valve spring assembly jig for the assembly of a spring (1) with a valve plug (2) in a valve, characterised in that, The base (3), the positioning seat (4) and the guide mechanism (5) are included, The base (3) is provided with a groove (31), the first end of the positioning seat (4) is in the groove (31), the bottom of the positioning seat (4) and the side and bottom of the groove (31) form a sealed cavity (6) for storing hydraulic oil, the base (3) is provided with an oil supply hole (32) communicating with the cavity (6), the oil supply hole (32) is provided with a blocking body (33), The second end of the positioning seat (4) is provided with a positioning unit (41) for positioning the valve plug (2), the guide mechanism (5) is interference fitted and installed at the end of the second end of the positioning seat (4), the positioning unit (41) is arranged at the connection between the positioning seat (4) and the guide mechanism (5), The guide mechanism (5) is internally provided with a spring mounting head (7) for positioning the spring (1), one end of the spring mounting head (7) is a conical structure, the conical angle of the conical structure is consistent with the spiral taper of the spring (1), the other end is provided with an elastic assembly (8), The center axis guide groove line of the spring mounting head (7) is collinear with the center axis of the positioning unit (41), The guide mechanism (5) includes a guide sleeve (51) and a guide column (52), One end of the guide sleeve (51) is interference fitted with the positioning seat (4), the other end is provided with a placing hole (511), the guide column (52) is gap fitted and arranged in the placing hole (511), The guide column (52) is internally provided with a through hole (521) for providing a conical structure movement space of the spring mounting head (7) and a through hole (522) for providing an elastic assembly (8) movement space, one end of the spring mounting head (7) with the conical structure extends out of the through hole (521) and extends to the positioning unit (41), the end of the non-conical structure end of the spring mounting head (7) is gap fitted and arranged in the through hole (522), The spring (1) is sleeved on the conical structure of the spring mounting head (7), the large diameter end of the spring (1) is close to the guide column (52), the inner diameter of the large diameter end of the spring (1) is greater than the inner diameter of the through hole (521).

2. The valve spring assembly clamp of claim 1, wherein, The elastic assembly (8) includes an elastic body (81) and a blocking body (82) for adjusting the pre-tightness of the elastic body (81), the blocking body (82) is arranged in the through hole (522), the position of the blocking body (82) in the through hole (522) is adjustable, and the elastic body (81) is arranged between the spring mounting head (7) and the blocking body (82).

3. The valve spring assembly clamp according to claim 1, wherein A fixing part (9) is arranged between the guide sleeve (51) and the guide column (52) to prevent the circumferential rotation of the guide column (52), A guide groove (523) is arranged on the right side of the guide column (52) to provide an end movement space for the fixing part (9), one end of the fixing part (9) is fixed in the guide sleeve (51), and the other end is located in the guide groove (523). Or, the guide sleeve (51) is provided with a guide groove two (512) for providing a linear motion space of one end of the fixing member one (9), one end of the fixing member one (9) is fixed in the guide column (52), the other end is located in the guide groove two (512), the guide column (52) is provided with a matched hole or groove for fixing the end of the fixing member one (9).

4. The valve spring assembly clamp of claim 1, wherein, The positioning seat (4) is provided with a matching protrusion (42), the guide sleeve (51) is provided with a matching groove (513), the matching groove (513) is communicated with the placement hole (511), the center axis of the matching groove (513) is collinear with the center axis of the placement hole (511), the diameter of the matching groove (513) is greater than the diameter of the placement hole (511), and the matching groove (513) is connected on the matching protrusion (42) in an interference fit.

5. The valve spring assembly fixture of any of claims 1-4, wherein, The outer peripheral wall of the positioning seat (4) abutting against the base (3) is provided with a plurality of groups of annular grooves (43), and the annular grooves (43) are provided with sealing members one (44).

6. The valve spring assembly fixture of any of claims 1-4, wherein, The base (3) is provided with a mounting hole (34), the mounting hole (34) is provided with a hydraulic gauge (10) extending into the cavity (6), the outside of the mounting hole (34) is provided with a sealing member two (35), and the outside of the sealing member two (35) is provided with a fixing member two (36) for fixing the hydraulic gauge (10).

7. The valve spring assembly fixture of any of claims 1-4, wherein, The base (3) is further provided with a mounting groove (37) for fixing the base (3) on a hydraulic press or a manual spinning press.

8. The valve spring assembly fixture of any of claims 1-4, wherein, The positioning unit (41) comprises a positioning groove, and the shape and size of the positioning groove are consistent with the arc-shaped end face of the valve plug (2).

9. A method of assembling a valve spring, characterized by, The valve spring assembly clamp of any one of claims 1-8 comprises the following steps: S1, injecting hydraulic oil into the cavity (6) through the oil supply hole (32); S2, placing the valve plug (2) at the positioning unit (41) for centering; S3, sleeving the spring (1) outside the conical structure of the spring mounting head (7) for centering; S4, applying pressure to the end of the guide mechanism (5), the guide mechanism (5) drives the elastic assembly (8) and the positioning seat (4) to move together and compress the cavity, so that the oil pressure in the cavity (6) rises, when the oil pressure in the cavity (6) is greater than the pre-pressure of the elastic assembly (8), continue to increase the pressure to make the guide mechanism (5) continue to move and make the elastic assembly (8) be compressed, keep the end of the spring (1) always aligning with and contacting the mounting surface of the valve plug (2), the end surface of the guide mechanism (5) applies pressure to the large end of the spring (1), and the mounting surface of the valve plug (2) applies pressure to the small end of the spring (1), so that the diameter of the small end of the spring (1) increases to be sleeved into the mounting surface of the valve plug (2), and the assembly of the spring (1) and the valve plug (2) is completed.

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