Assembly tool for preventing pipe nozzle from biting and its use method

Abstract

The present invention provides a pipe nozzle anti-seizure assembly tool and a method of using the same, including a press, a horizontal clamp, a jacking tool and a verticality measuring instrument, wherein the horizontal clamp is installed on the press; the horizontal clamp is used to clamp the high-pressure solenoid valve, which is arranged below the pressure head of the press; the top of the jacking tool is used to overlap with the bottom of the pressure head, the bottom of the jacking tool is used to pass through the through hole in the middle of the pipe nozzle of the high-pressure solenoid valve, and overlap with the top of the valve assembly of the high-pressure solenoid valve, and the verticality measuring instrument is installed on one side of the jacking tool. The present invention has a simple structure and is easy to operate. A horizontal clamp, a jacking tool and a press are added to the original pipe nozzle tightening method, so that the valve assembly and the pipe nozzle are separated from each other during the assembly process, eliminating the risk of the pipe nozzle being skewed and seizure due to the valve assembly supporting the pipe nozzle.

Description

Technical Field

[0001] The present invention relates to the technical field of assembly tooling, and in particular to an assembly tooling for preventing a pipe nozzle from being stuck and a method of using the same, and in particular to an assembly tooling for preventing a pipe nozzle from being stuck and a method of using the same for a high-pressure solenoid valve on a space launch vehicle. Background Art

[0002] High-pressure solenoid valve is a key valve product on the new cryogenic launch vehicle. Its structure is as follows Figure 1 As shown, the nozzle of this product is directly screwed in manually during assembly, and the matching clearance between the guide section of the nozzle 11 and the guide section of the shell 13 is 0.005~0.013mm, which is extremely small. During the assembly of the nozzle 11, the spring force pushes out the valve assembly 15, and the nozzle 11 becomes skewed after being subjected to the pressure of the valve assembly 15, which can easily cause the guide section of the nozzle 11 and the shell 13 to be stuck together, causing the entire product to be scrapped and the production cost to be extremely high.

[0003] On this basis, it is urgent to develop an anti-seizure assembly tool and a method of using it to eliminate the risk of the nozzle and the shell being stuck. Summary of the invention

[0004] In view of the defects in the prior art, the object of the present invention is to provide a pipe nozzle anti-seizure assembly tool and a use method thereof.

[0005] The anti-seizure assembly tool for the pipe nozzle provided by the present invention comprises a press, a horizontal fixture, a jacking tool and a verticality measuring instrument, wherein the horizontal fixture is installed on the press;

[0006] The horizontal clamp is used to clamp a high-pressure solenoid valve, and the high-pressure solenoid valve is arranged below a pressure head of the press;

[0007] The top of the lifting tool is used to overlap with the bottom of the pressure head, and the bottom of the lifting tool is used to pass through the through hole in the middle of the nozzle of the high-pressure solenoid valve and overlap with the top of the valve assembly of the high-pressure solenoid valve. The verticality measuring instrument is installed on one side of the lifting tool.

[0008] Preferably, the verticality measuring instrument comprises a dial indicator, and the position between the dial indicator and the housing of the high-pressure solenoid valve is kept fixed;

[0009] The measuring head of the dial indicator is used to overlap with the outer cylindrical surface of the head of the jacking tool, and the dial indicator is in the vertical direction.

[0010] Preferably, the horizontal clamp comprises a flat-nose pliers, the flat-nose pliers are fixedly mounted on a base of the press, and the flat-nose pliers are arranged directly below the press head;

[0011] The flat-nose pliers include a flat jaw for clamping and fixing a housing of the high-pressure solenoid valve, and a handle is provided at a movable end of the flat jaw for serving as a counter torque during a fixed torque tightening process of a nozzle of the high-pressure solenoid valve;

[0012] When the high-pressure solenoid valve is clamped in the flat-mouth pliers, the housing of the high-pressure solenoid valve and the pressure head are coaxially arranged.

[0013] Preferably, the press comprises a manual press, the manual press comprises a base, a bracket, a pressing head and a hand wheel, and the horizontal clamp and the bracket are both mounted on the base;

[0014] The pressure head is installed in the bracket and connected with the bracket through threaded cooperation. The top of the pressure head is fixedly connected with the hand wheel.

[0015] Preferably, the lifting tool comprises a pressing portion and a push rod portion arranged in sequence from top to bottom, the pressing portion is a disc structure, the top of the disc structure is used to overlap with the bottom of the pressure head, and the diameter of the disc structure is greater than the diameter of the pressure head;

[0016] The push rod portion is a cylindrical structure, which is used to pass through the through hole in the middle of the nozzle of the high-pressure solenoid valve and overlap with the top of the valve assembly. The diameter of the cylindrical structure is smaller than the diameter of the through hole in the middle of the nozzle.

[0017] Preferably, a gap is provided between the outer circle of the ejector rod portion of the ejection tool and the inner wall of the through hole in the middle of the nozzle.

[0018] Preferably, the length of the push rod portion of the lifting tool is greater than the sum of the length of the nozzle and the stroke of the bottom spring of the valve assembly.

[0019] According to the method for using the anti-seizure assembly tool for the pipe nozzle provided by the present invention, the anti-seizure assembly tool for the pipe nozzle is used, and the following steps are included:

[0020] Step 1: Screw the nozzle into the housing. Stop screwing when the nozzle hits the valve assembly or when the nozzle encounters resistance.

[0021] Step 2: Place the flat-nose pliers on the press, place the nozzle upward on the flat-nose pliers, and clamp it with the flat-nose pliers, aligning the center of the nozzle with the center of the press head;

[0022] Step 3: Place the lifting tool into the nozzle from top to bottom, with the lower end of the lifting tool against the center of the valve assembly, and the side wall of the lifting tool not in contact with the nozzle;

[0023] Step 4: Lower the pressure head and hold the lifting tool. When the lifting tool moves downward, the pressure head stops moving.

[0024] Step 5: Place the dial indicator pin on the lower edge of the jacking tool head and return the dial indicator to zero;

[0025] Step 6: Control the pressure head to descend, and lift the valve assembly downwards through the lifting tool. When the valve assembly is lifted to the lower limit, stop the action;

[0026] Step 7: After the valve assembly is lifted up to the position, screw the nozzle down again to the limit and tighten it with a fixed torque. During the tightening process, the handle of the flat-nose pliers provides a counter-torque.

[0027] Preferably, in step 6, during the descent of the pressure head, the dial indicator value is read throughout the entire process, and the skew range of the jacking tooling is measured by the dial indicator value;

[0028] If the skew range exceeds the preset range, remove the lifting tooling, adjust the position of the lifting tooling and jump to step 3. If the skew range is within the preset range, execute step 7.

[0029] Among them, the preset range is 0-0.3mm.

[0030] Preferably, in step 3, the outer diameter of the lifting tool is 3-4 mm smaller than the inner diameter of the nozzle, and the outer circumference of the lifting rod is wrapped with tape;

[0031] Before the lifting tool performs the lifting action, light and observe the gap between the ejector rod and the inner wall of the nozzle, slowly press it in by adjusting the position of the press and the ejector rod, and finally, the lower end plane of the lifting tool is against the center plane of the valve assembly.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention has a simple structure and is easy to operate. A horizontal clamp, a lifting tool and a press are added to the original method for tightening the nozzle, so that the valve assembly and the nozzle are separated from each other during the assembly process, eliminating the risk of the nozzle being skewed and stuck because the valve assembly presses against the nozzle.

[0034] 2. The present invention provides a method for using a dial indicator to measure whether the jacking tool is skewed, thereby eliminating the tangential force caused by improper operation of the tool, ensuring that the pipe nozzle can be freely screwed in without force and tightened with a fixed torque, eliminating the risk of the pipe nozzle and the shell being stuck. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0036] Figure 1 It is a structural schematic diagram of the high-pressure solenoid valve in the present invention;

[0037] Figure 2 It is a structural schematic diagram of the high-pressure solenoid valve in the present invention in a preliminary assembly state;

[0038] Figure 3 It is a schematic diagram of the overall structure of the present invention;

[0039] Figure 4 for Figure 3 A partial enlarged schematic diagram of the middle A part;

[0040] Figure 5 It is a structural schematic diagram of the present invention when the valve assembly is pressed to the limit position;

[0041] Figure 6 It is a schematic diagram of the structure when the pipe nozzle is tightened with a fixed torque in the present invention.

[0042] The figure shows:

[0043] The nozzle 11, the sealing gasket 12, the housing 13, the sealing assembly 14, the valve assembly 15, the spring 16, the press machine 20, the hand wheel 21, the pressure head 22, the dial indicator 30, the lifting tool 40, and the flat-nose pliers 50. DETAILED DESCRIPTION

[0044] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0045] The invention discloses an assembly tool for preventing a pipe nozzle from being stuck and a use method thereof. By adding a horizontal clamp, a lifting tool and a press machine to the original method for tightening the pipe nozzle, a valve assembly and the pipe nozzle are separated from each other during the assembly process, thereby eliminating the risk of the pipe nozzle being skewed and stuck due to the valve assembly supporting the pipe nozzle.

[0046] According to the pipe nozzle anti-seizure assembly tool provided by the present invention, Figure 3 As shown, it includes a press 20, a horizontal clamp, a lifting tool 40 and a verticality measuring instrument, wherein the horizontal clamp is installed on the press 20; the horizontal clamp is used to clamp the high-pressure solenoid valve, and the high-pressure solenoid valve is arranged below the pressure head 22 of the press 20; the top of the lifting tool 40 is used to overlap with the bottom of the pressure head 22, and the bottom of the lifting tool 40 is used to pass through the through hole in the middle of the nozzle 11 of the high-pressure solenoid valve and overlap with the top of the valve assembly 15 of the high-pressure solenoid valve, and the verticality measuring instrument is installed on one side of the lifting tool 40.

[0047] In a preferred example, the verticality measuring instrument includes a dial indicator 30, the position between the dial indicator 30 and the housing 13 of the high-pressure solenoid valve is kept fixed; the measuring head of the dial indicator 30 is used to overlap the outer cylindrical surface of the head of the jacking tool 40, and the dial indicator 30 is in the vertical direction. The dial indicator 30 measures whether the jacking tool 40 is skewed during the jacking action, prevents the nozzle 11 from being subjected to the radial force from the jacking tool 40, and eliminates the risk of the nozzle 11 being skewed due to the jacking tool 40.

[0048] In a preferred example, the horizontal clamp includes a flat-nose pliers 50, which are fixedly mounted on the base of the press 20 and are arranged directly below the pressure head 22; the flat-nose pliers 50 include flat jaws for clamping and fixing the housing 13 of the high-pressure solenoid valve, and the movable end of the flat jaws is provided with a handle for serving as a counter torque during the fixed torque tightening process of the pipe nozzle 11 of the high-pressure solenoid valve; when the high-pressure solenoid valve is clamped in the flat-nose pliers 50, the housing 13 of the high-pressure solenoid valve is coaxially arranged with the pressure head 22. The flat-nose pliers 50 fix the housing 13 and provide stable support to ensure that the housing 13 is in a vertical state, and at the same time, provide a counter torque when the pipe nozzle 11 is tightened with a fixed torque.

[0049] In a preferred example, the press 20 includes a manual press, which includes a base, a bracket, a pressing head 22 and a hand wheel 21, and the horizontal clamp and the bracket are both installed on the base; the pressing head 22 is installed in the bracket and connected to the bracket through threaded cooperation, and the top of the pressing head 22 is fixedly connected to the hand wheel 21. The manual press provides vertical downward force to press the lifting tool 40 downward, and after the lifting tool 40 is pressed downward, the valve assembly 15 is separated from the nozzle 11. Preferably, the manual press has a flat work surface with a surface roughness of Ra1.6 and a flatness of 0.05mm, and can provide vertical downward force.

[0050] In a preferred example, the lifting tool 40 includes a pressing part and a push rod part arranged in sequence from top to bottom, the pressing part is a disc structure, the top of the disc structure is used to overlap with the bottom of the pressure head 22, and the diameter of the disc structure is larger than the diameter of the pressure head 22; the push rod part is a cylindrical structure, the cylindrical structure is used to pass through the through hole in the middle of the nozzle 11 of the high-pressure solenoid valve and overlap with the top of the valve assembly 15, and the diameter of the cylindrical structure is smaller than the diameter of the through hole in the middle of the nozzle 11. The lifting tool 40 lifts the valve assembly 15 during assembly, so that the valve assembly 15 is separated from the nozzle 11 during assembly, eliminating the force of the valve assembly 15 on the nozzle 11.

[0051] Preferably, there is a large gap between the outer circle of the lifting tool 40 and the inner wall of the nozzle 11, and this gap is used to avoid touching the nozzle 11 during the lifting action. The lifting tool 40 is made of polyimide, which is a high-hardness plastic material with small deformation under force and avoids damaging the valve assembly 15. The length of the lifting rod part of the lifting tool 40 is greater than the sum of the length of the nozzle 11 and the stroke of the spring 16 at the bottom of the valve assembly 15.

[0052] According to the method for using the anti-seizure assembly tool of the pipe nozzle provided by the present invention, flat-nose pliers 50, a lifting tool 40, a dial indicator 30 and a manual press 20 are added to the original pipe nozzle tightening method, so that the valve assembly 15 and the pipe nozzle 11 are separated from each other during the assembly process, eliminating the risk of the pipe nozzle 11 being skewed and seizure due to the valve assembly 15 supporting the pipe nozzle 11. At the same time, a method for using the dial indicator 30 to measure whether the lifting tool 40 is skewed is provided, eliminating the tangential force caused by improper tool operation, ensuring that the pipe nozzle 11 can be freely screwed in without force and tightened with a fixed torque, eliminating the risk of the pipe nozzle 11 and the housing 13 being seizure. Figure 4-Figure 6 As shown, an anti-seizure assembly method for a pipe nozzle provided in an embodiment of the present invention is aimed at assembling a pipe nozzle of a high-pressure solenoid valve of a space launch vehicle.

[0053] The specific operation method is as follows:

[0054] The first step, such as Figure 2 As shown, taking the housing 13 as a reference, the spring 16, the valve assembly 15, the sealing assembly 14 and the sealing gasket 12 are installed in sequence.

[0055] Step 2: Screw the filler nozzle 11 into the housing 13, and stop immediately when the filler nozzle 11 hits the valve assembly 15 or feels resistance during the screwing process.

[0056] Step 3: Figure 3 and Figure 4 As shown, a flat-nose pliers 50 is placed on the manual press 20 , and the nozzle 11 is placed upward on the flat-nose pliers 50 , and is clamped using the flat-nose pliers 50 , and the center of the nozzle 11 is aligned with the center of the pressing head 22 of the manual press 20 .

[0057] Step 4: Place the lifting tool 40 from top to bottom into the pipe nozzle 11. The lower end of the lifting tool 40 is against the center of the valve assembly 15, and the side wall does not touch the pipe nozzle 11. The outer diameter of the lifting tool 40 is designed to be 3-4mm smaller than the inner diameter of the pipe nozzle 11. At the same time, the structural strength of the tooling push rod is ensured, and 1-2 thin layers of soft tape are evenly wrapped around the outer circle of the push rod. Finally, the lower end plane of the lifting tool 40 is against the center plane of the valve assembly 15. Before the lifting action, the gap between the push rod and the inner wall of the pipe nozzle 11 is observed by naked eyes through lighting, and the press machine 20 is slowly pressed in by adjusting the position of the push rod. If the lifting tool rod is in contact with the inner wall of the pipe nozzle 11, the lifting tool 40 and the inner wall of the pipe nozzle 11 will rub against each other during the lifting action, resulting in a damping feeling of motion stagnation and friction. Finally, it is ensured that the side wall of the lifting tool 40 and the inner wall of the pipe nozzle 11 are prevented from scratching or touching.

[0058] Step 5: Rotate the hand wheel of the manual press 20 to lower the pressing head 22 and lightly push against the lifting fixture 40, that is, stop the movement when the lifting fixture 40 is felt to be displaced downward.

[0059] Step 6: Place the pin of the dial indicator 30 against the lower edge of the head of the lifting tool 40 and return the dial indicator 30 to zero.

[0060] Step 7: Figure 5 As shown, rotate the handwheel 21 of the manual press 20, lower the pressure head 22, slowly press in the lifting fixture 40, lift the valve assembly 15, and stop the action when the valve assembly 15 is lifted to the lower limit. During the pressing process, pay attention to the value of the dial indicator 30, measure and control the skew range of the lifting fixture 40. If it exceeds the required range, unscrew the handwheel 21 of the manual press 20, take out the lifting fixture 40, adjust the position of the lifting fixture 40, and then repeat the fourth to seventh steps.

[0061] from Figure 4It can be seen that there is a large gap between the rod of the lifting tool 40 and the inner wall of the nozzle 11. Even if the lifting tool 40 is tilted too much, it will not touch the nozzle 11, thereby improving operability. Therefore, the tilt range of the lifting tool 40 can be controlled within 0.3 mm. If the skew range exceeds the preset range of 0.3mm, the lifting fixture 40 will touch the filler nozzle 11 and cause the filler nozzle 11 to be subjected to radial force. The purpose of the present invention is to prevent the filler nozzle 11 from being subjected to the force of the spring 16 and the valve assembly 15 during assembly, and to avoid the additional force caused by the lifting fixture 40. Since the gap between the guide section of the filler nozzle 11 and the guide section of the shell is extremely small, when tightening, a slight skew of the filler nozzle 11 will cause the filler nozzle 11 and the shell to be stuck, and these forces will cause the filler nozzle 11 to be skewed, causing the product to be stuck and scrapped. Therefore, it is necessary to remove the lifting fixture 40, adjust the position of the lifting fixture 40, and then repeat the fourth to seventh steps. If the skew range is within the preset range of 0.3mm, execute the eighth step.

[0062] Step 8: Figure 6 As shown, after the valve assembly 15 is lifted up to the position, the nozzle 11 is screwed down again to the limit position, and a torque wrench is used to clamp the outer hexagon of the nozzle 11 and tighten it with a fixed torque, and the handle of the flat-nose pliers 50 provides a counter torque.

[0063] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0064] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A nozzle anti-seizure assembly tool, characterized in that: It comprises a press machine (20), a horizontal clamp, a jacking tool (40) and a verticality measuring instrument, wherein the horizontal clamp is installed on the press machine (20); The horizontal clamp is used to clamp a high-pressure solenoid valve, and the high-pressure solenoid valve is arranged below a pressure head (22) of the press machine (20); The top of the lifting tool (40) is used to overlap with the bottom of the pressure head (22), and the bottom of the lifting tool (40) is used to pass through the through hole in the middle of the nozzle (11) of the high-pressure solenoid valve and overlap with the top of the valve assembly (15) of the high-pressure solenoid valve, and the verticality measuring instrument is installed on one side of the lifting tool (40); The verticality measuring instrument comprises a dial indicator (30), and the position between the dial indicator (30) and a housing (13) of the high-pressure solenoid valve is kept fixed; The measuring head of the dial gauge (30) is used to overlap the outer cylindrical surface of the head of the jacking tool (40), and the dial gauge (30) is in the vertical direction; The horizontal clamp comprises a flat-nose pliers (50), the flat-nose pliers (50) being fixedly mounted on a base provided by the press machine (20), and the flat-nose pliers (50) being arranged directly below the press head (22); The press machine (20) comprises a base, a bracket and a pressing head (22), the flat-nose pliers (50) and the bracket are both mounted on the base, and the pressing head (22) is mounted in the bracket; The lifting tool (40) comprises a pressing portion and a push rod portion which are arranged in sequence from top to bottom, the pressing portion being a disc structure, the top of the disc structure being used to overlap the bottom of the pressing head (22), and the diameter of the disc structure being greater than the diameter of the pressing head (22); The push rod portion is a cylindrical structure, the cylindrical structure is used to pass through the through hole in the middle of the filling nozzle (11) of the high-pressure solenoid valve and overlap with the top of the valve assembly (15), and the diameter of the cylindrical structure is smaller than the diameter of the through hole in the middle of the filling nozzle (11).

2. The anti-seizure assembly tool for the pipe nozzle according to claim 1, characterized in that: The flat-nose pliers (50) comprise a flat jaw for clamping and fixing a housing (13) of the high-pressure solenoid valve, and a handle is provided at a movable end of the flat jaw for serving as a counter torque during a fixed-torque tightening process of a nozzle (11) of the high-pressure solenoid valve; When the high-pressure solenoid valve is clamped in the flat-nose pliers (50), the housing (13) of the high-pressure solenoid valve and the pressure head (22) are coaxially arranged.

3. The anti-seizure assembly tool for the pipe nozzle according to claim 1, characterized in that: The press machine (20) is a manual press machine, the press head (22) is installed in a bracket and connected to the bracket via a threaded fit, and a hand wheel (21) is fixedly connected to the top of the press head (22).

4. The anti-seizure assembly tool for the pipe nozzle according to claim 1, characterized in that: A gap is provided between the outer circle of the push rod portion of the lifting tool (40) and the inner wall of the middle through hole of the nozzle (11).

5. The anti-seizure assembly tool for the pipe nozzle according to claim 1, characterized in that: The length of the push rod portion of the lifting tool (40) is greater than the sum of the length of the nozzle (11) and the stroke of the bottom spring (16) of the valve assembly (15).

6. A method for using a nozzle anti-seizure assembly tool, characterized in that: The anti-seizure assembly tool for the pipe nozzle according to any one of claims 1 to 5 comprises the following steps: Step 1: Screw the filler nozzle (11) into the housing (13), and stop screwing when the filler nozzle (11) hits the valve assembly (15) or when the filler nozzle (11) encounters resistance; Step 2: Place the flat-nose pliers (50) on the press (20), place the nozzle (11) on the flat-nose pliers (50) with the nozzle facing upward, and clamp it with the flat-nose pliers (50), aligning the center of the nozzle (11) with the center of the pressure head (22) of the press (20); Step 3: Place the lifting tool (40) into the nozzle (11) from top to bottom, with the lower end of the lifting tool (40) supporting the center of the valve assembly (15), and the side wall of the lifting tool (40) not in contact with the nozzle (11); Step 4: lower the pressure head (22) to support the lifting tool (40), and when the lifting tool (40) moves downward, the pressure head (22) stops moving; Step 5: Place the pin of the dial indicator (30) against the lower edge of the head of the lifting tool (40), and return the dial indicator (30) to zero; Step 6: Control the pressure head (22) to descend, and lift the valve assembly (15) downwards by means of the lifting tool (40), and stop the action when the valve assembly (15) is lifted to the lower limit position; Step 7: After the valve assembly (15) is lifted up to the position, the nozzle (11) is screwed down again to the limit position and the nozzle (11) is tightened with a fixed torque. During the tightening process, the handle of the flat-nose pliers (50) provides a counter torque.

7. The method for using the nozzle anti-seizure assembly tool according to claim 6 is characterized in that: In step 6, during the descent of the pressure head (22), the value of the dial indicator (30) is read throughout the entire process, and the skew range of the jacking tool (40) is measured by the value of the dial indicator (30); If the skew range exceeds the preset range, the lifting tool (40) is removed, and the position of the lifting tool (40) is adjusted, and then the process jumps to step 3; if the skew range is within the preset range, step 7 is executed; Among them, the preset range is 0-0.3mm.

8. The method for using the nozzle anti-seizure assembly tool according to claim 6, characterized in that: In step 3, the outer diameter of the lifting tool (40) is 3-4 mm smaller than the inner diameter of the nozzle (11), and the outer circumference of the lifting rod is wrapped with tape; Before the lifting tool (40) performs the lifting action, the clearance between the push rod portion and the inner wall of the nozzle (11) is observed by lighting, and the push rod portion is slowly pressed in by adjusting the position of the press machine (20) and the push rod portion, and finally the lower end plane of the lifting tool (40) is pressed against the center plane of the valve assembly (15).

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