CN112067269A - Hydraulic solenoid valve electromagnet position stroke detection device and detection method thereof - Google Patents
Hydraulic solenoid valve electromagnet position stroke detection device and detection method thereof Download PDFInfo
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- CN112067269A CN112067269A CN202010916367.3A CN202010916367A CN112067269A CN 112067269 A CN112067269 A CN 112067269A CN 202010916367 A CN202010916367 A CN 202010916367A CN 112067269 A CN112067269 A CN 112067269A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
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Abstract
The invention relates to the technical field of assembly and debugging of airplane hydraulic solenoid valves, in particular to a hydraulic solenoid valve electromagnet position stroke detection device and a detection method thereof, wherein the hydraulic solenoid valve electromagnet position stroke detection device comprises a positioning sleeve for sequentially mounting a first steel ball, a valve seat, a steel ball push rod, a second steel ball and a guide seat, a clamping sleeve for mounting the positioning sleeve, a bushing for sequentially mounting an armature, a stop block and an armature push rod, a sleeve for mounting the bushing, a thimble bolt arranged at the end of the sleeve far away from the bushing, and a thimble arranged at the center of the thimble bolt and used for pushing the first steel ball in the valve seat, and the detection method comprises the following specific steps: s1: the remaining stroke E of the armature push rod; s2: the remaining stroke L of the armature push rod; s3: and (3) working stroke S of the steel ball, namely, simulating an electromagnetic power-on working state by using a reverse pushing method and taking the state that the tail end of the armature push rod is flush with the bottom of the stop block as an initial position, and pushing a thimble of the measuring device or screwing a thimble bolt to reversely push out the stroke in a forward state, thereby designing a simple and convenient inspection method.
Description
Technical Field
The invention relates to the technical field of assembly and debugging of hydraulic electromagnetic valves of airplanes, in particular to a stroke detection device and a stroke detection method for an electromagnet part of a hydraulic electromagnetic valve.
Background
The hydraulic electromagnetic valve is used for an aircraft landing gear retraction system, a speed reduction plate retraction system and a protection device retraction system and controls the on-off of an oil path of the retraction actuator cylinder. The hydraulic electromagnetic valve is a three-position four-way electromagnetic valve, as shown in fig. 1, the electromagnet part of the hydraulic electromagnetic valve is a switch for controlling the connection or disconnection of a hydraulic oil circuit of an aircraft hydraulic system and loads 1 and 2, and the function is very critical, so that the execution of a flight task is influenced. Whether the electromagnet part works normally or not influences the normal work of the whole electromagnetic valve, and the working stroke value designed at the electromagnet part is small, so that the detection of partial stroke of the electromagnet is an important control item in the assembling and debugging process of the hydraulic electromagnetic valve, and whether the stroke detection is accurate or not directly influences the working performance of the electromagnetic valve to be qualified or not is detected.
In the detection of the stroke of the electromagnet part, the main working contents are the protrusion amount of the armature push rod, the residual stroke of the armature push rod and the working stroke of the steel ball. The protrusion amount of the armature push rod refers to the protrusion amount from the tail end of the armature push rod to the bottom of the stop block, namely L, when the steel ball close to one side of the filter screen abuts against the valve port sealed on the valve seat, as shown in fig. 2. The residual stroke of the armature push rod refers to the residual stroke from the tail end of the armature push rod to the bottom of the stop block, namely E, when the armature push rod is driven by the electromagnet to a stop position, as shown in figure 2, the working stroke of the steel ball refers to the state that the steel ball at one side is tightly attached to the valve port sealed by the valve seat, as shown in figure 3, the steel ball at the other side is pushed to be tightly attached to the valve port sealed at the same side on the valve seat, and at the moment, the steel ball originally tightly attached to the valve port of the valve seat moves under the action of.
On the basis that the armature push rod and the steel ball push rod act together to output electromagnetic force in the electromagnet and push the steel ball, a passage between the steel ball on one side of the filter screen and the valve seat is opened, sealing between the steel ball on the other side of the filter screen and the valve seat is achieved, on the basis, high-pressure oil pushes the piston to open the valve core, and the joint is communicated with an oil passage to enable the high-pressure oil to execute components. The protruding amount, the residual stroke and the steel ball stroke of the armature push rod directly influence the initial state and the open state of the steel ball valve assembly of the electromagnet, the steel ball valve assembly is stably in the fully open state when the armature push rod reaches the stop position when the electromagnet is powered on, and the steel ball reliably resets to close an oil circuit when the electromagnet is powered off. The three values are set by adjusting the lengths of the repaired armature push rod and the steel ball push rod in the assembling process, and during the manufacturing and repairing of the electromagnetic valve, the assembling, debugging and detecting of partial stroke of the electromagnet are very important processes in the assembling process of the electromagnetic valve.
The device and the method for detecting the internal stroke of the electromagnet in a common aircraft electromagnetic valve product adopt a mode of respectively measuring the values, and measure through the on-off of the electromagnet, the electromagnet is repeatedly disassembled and assembled in the detection process, after the electromagnet works in an electrified mode, the rest idle stroke of the push rod at the stopping position and away from the bottom of the stop block cannot be directly measured, the measurement needs to be connected with a power supply, and the method is complicated and low in efficiency. Therefore, a detection device and a detection method which are visual, effective, concise and convenient need to be designed to meet the requirement of the solenoid position stroke of the solenoid valve.
Disclosure of Invention
In order to solve the above problems, the present invention provides a hydraulic solenoid valve electromagnet position stroke detection device and a detection method thereof.
The utility model provides a hydraulic solenoid valve electro-magnet position stroke detection device, is including the position sleeve that is used for installing steel ball one in proper order, valve seat, steel ball push rod, steel ball two, guide holder, the cutting ferrule that is used for installing the position sleeve, be used for installing armature, dog, the bush of armature push rod in proper order, be used for installing the sleeve of bush, set up the thimble bolt of keeping away from bush end at the sleeve, set up the thimble that is used for promoting valve seat internal steel ball one in thimble bolt center department.
The clamping sleeve and the sleeve are screwed and matched through threads until the positioning sleeve is pressed against the stop block.
And a dial indicator is locked on the end part of the sleeve far away from the sleeve by applying a certain pre-tightening amount and using a screw.
The aperture of the positioning sleeve is compared with the outer diameter of the valve seat, and the aperture of the lining sleeve is compared with the size of the inner cavity of the electromagnet.
The center of the thimble bolt is provided with a center hole for conveniently installing a thimble.
A detection method of a hydraulic solenoid valve electromagnet position stroke detection device comprises the following specific steps:
s1: residual stroke E of the armature push rod: the gap can be measured by pushing the valve seat to the guide seat in the forward direction, and the detection method comprises the following steps:
a: sequentially installing a positioning sleeve, a guide seat, a first steel ball, a valve seat, a steel ball push rod, a second steel ball and the guide seat into the clamping sleeve;
b: the bushing, the armature, the stop block and the armature push rod are arranged in the sleeve, and the clamping sleeve and the sleeve are screwed until the positioning sleeve and the stop block are pressed tightly;
c: the dial indicator is clamped into the other end of the sleeve, a certain pre-tightening amount is applied, the sleeve is locked by a screw, at the moment, the armature is pushed by the self elasticity of the dial indicator to push the armature push rod to the bottom of the stop block, and a gap is formed between the valve seat and the guide seat;
d: the dial indicator is calibrated, the thimble bolt is screwed in at the other end of the sleeve, the valve seat is pushed at the moment, when the valve seat is attached to the guide seat, namely, under the state that the thimble bolt is screwed, the dial indicator at the moment is read, and the indication value of the dial indicator is the residual stroke of the armature push rod;
s2: residual stroke L of the armature push rod: the detection method for the protrusion amount of the armature push rod is combined with consideration, a center hole is formed in the center of an ejector pin bolt, an ejector pin extends into the center hole, the ejector pin directly pushes a first steel ball in a valve seat, the steel ball pushes the valve seat again and again to push forwards, when the valve seat is attached to a guide seat, the amount of movement of the ejector pin is the protrusion amount of the armature push rod, and the detection method comprises the following steps:
a: after the residual stroke of the armature push rod is measured, loosening the ejector pin bolt to enable the dial indicator to return to zero, and extending an ejector pin into the center hole of the ejector pin bolt to push the steel ball II;
b: when the valve seat is attached to the guide seat, the thimble stops, the dial indicator at the moment is read, and the indication value of the dial indicator 11 is the projection L of the armature push rod;
s3: working stroke S of the steel ball: according to a formula, the protrusion amount L of the armature push rod is equal to the residual stroke E of the armature push rod and the working stroke of the steel ball, and the detection method comprises the following steps:
a: and screwing the thimble bolt, attaching the valve seat to the guide seat, resetting the dial indicator, extending the thimble 1 into the first steel ball to push, reading the indication value of the dial indicator when the thimble stops, and taking the indication value of the dial indicator as the working stroke S of the steel ball.
The invention has the beneficial effects that: the invention realizes the detection of the internal stroke of the electromagnet of the hydraulic electromagnetic valve by using a simple device without complicated operations of electrifying the electromagnet; simulating the thrust of an electromagnet by using the self elasticity of the dial indicator, applying a pre-tightening amount to keep the tail end of the armature push rod in a state of being flush with the bottom of the stop block, and simulating a power-on working state; by utilizing a reverse pushing method, the tail end of the armature push rod is flush with the bottom of the stop block to serve as an initial position, namely an electromagnetic power-on working state is simulated, and the stroke in a forward state is reversely pushed out by pushing a thimble of a measuring device or screwing a thimble bolt, so that a simple and convenient inspection method is designed; three kinds of stroke detection of the electromagnet part are integrated on one detection device, particularly the thimble and the screw-in thimble are nested and combined, the whole measurement can be realized by one-time installation, the detection operation is convenient and fast, and the detection method is visual and effective.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of a part of the structure of an electromagnet of a hydraulic solenoid valve of the present invention;
FIG. 2 is a first diagram illustrating the structure of the stroke of the electromagnet according to the present invention;
FIG. 3 is a second schematic diagram of the electromagnet position stroke structure of the present invention;
FIG. 4 is a schematic structural view of the present invention;
FIG. 5 is a schematic diagram of the residual stroke structure of the armature push rod of the present invention;
FIG. 6 is a schematic view of an armature tappet protrusion configuration of the present invention;
FIG. 7 is a schematic view of a thimble structure according to the present invention;
FIG. 8 is a structural diagram of a thimble bolt according to the present invention;
FIG. 9 is a schematic view of the structure of the positioning sleeve of the present invention;
FIG. 10 is a schematic view of the bushing configuration of the present invention;
the reference numbers are as follows:
1. a thimble; 2. a thimble bolt; 3. a card sleeve; 4. a first steel ball; 5. a positioning sleeve; 6. a second steel ball; 7. a bushing; 8. fixing a bracket; 9. a sleeve; 10. a bolt; 11. a dial indicator; 12. an armature; 13. an armature push rod; 14. a stopper; 15. a guide seat; 16. a valve seat 17 and a steel ball push rod; 18. a guide member; 19. a solenoid valve housing; 20. filtering with a screen; 21. a retention spring; 22. an electromagnet.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below.
As shown in fig. 1 to 10, a stroke detection device for a position of a hydraulic solenoid valve electromagnet comprises a positioning sleeve 5 for sequentially mounting a first steel ball 4, a valve seat 16, a steel ball push rod 17, a second steel ball 6 and a guide seat 15, a clamping sleeve 3 for mounting the positioning sleeve 5, a bushing 7 for sequentially mounting an armature 12, a stop 14 and an armature push rod 13, a sleeve 9 for mounting the bushing 7, an ejector pin bolt 2 arranged at the end of the sleeve 9 far away from the bushing 7, and an ejector pin 1 arranged at the center of the ejector pin bolt 2 and used for pushing the first steel ball 4 in the valve seat 16.
The second steel ball 6 is clamped between the armature push rod 13 and the steel ball push rod 17, and hydraulic oil is prevented from entering the electromagnet 22.
Because the residual stroke of the electromagnet armature push rod 13 is difficult to detect by a common electromagnet energizing measurement mode, a reverse pushing method is adopted, the electromagnet is not energized, the pretightening quantity is applied by utilizing the self elasticity of a dial indicator, the armature 12 is directly pushed to be attached to the stop block 14, a clearance which is several times larger than the residual stroke E of the armature push rod 13 is left between parts on the right side at the moment, the armature 12 and the stop block 14 of the electromagnet can be ensured to be reliably attached in a measurement initial state, and corresponding measurement data can be obtained by reversely pushing the electromagnet steel ball valve component.
The invention realizes the detection of the internal stroke of the electromagnet of the hydraulic electromagnetic valve by using a simple device without complicated operations of electrifying the electromagnet; simulating the thrust of an electromagnet by using the self elasticity of the dial indicator 11, applying a pre-tightening amount to keep the tail end of the armature push rod 13 in a state of being flush with the bottom of the stop block 14, and simulating a power-on working state; the invention utilizes a reverse pushing method, takes the state that the tail end of the armature push rod 13 is flush with the bottom of the stop block 14 as an initial position, namely, simulates the electromagnetic power-on working state, and reversely pushes the stroke in the forward state by pushing the thimble 1 or screwing the thimble bolt 2 of the measuring device, thereby designing a simple and convenient inspection method; three kinds of stroke detection of the electromagnet part are integrated on one detection device, particularly the thimble 1 and the precession thimble 1 are in a nested combination design, the whole measurement can be realized by one-time installation, the detection operation is convenient and fast, and the detection method is visual and effective.
The cutting sleeve 3 and the sleeve 9 are screwed and matched through threads until the positioning sleeve 5 is pressed against the stop block 14.
And a dial indicator 11 is locked on the end part of the sleeve 9 far away from the sleeve 9 by applying a certain pre-tightening amount and using a screw.
The aperture of the positioning sleeve 5 is matched with the outer diameter of the valve seat 16, the aperture of the lining 7 is matched with the size of the inner cavity of the electromagnet 22, and the specific gap is matched with the size according to the product requirement.
The center of the thimble bolt 2 is provided with a center hole for conveniently installing the thimble 1.
According to the internal structure form of the electromagnet, the working principle is designed by fully considering the actual position of the movement of the armature push rod 13 in the electromagnet, the protruding amount of the armature push rod 13 and the detection of the working stroke of the steel ball are designed by combining the consideration, the influence of irrelevant parts in the electromagnet on the design of the detection device is removed, and the design of the detection device is simplified.
A detection method of a hydraulic solenoid valve electromagnet position stroke detection device comprises the following specific steps:
s1: residual stroke E of the armature tappet 13: the gap can be measured by pushing the valve seat 16 to the guide seat 15 in the forward direction, and the detection method comprises the following steps:
a: sequentially arranging a positioning sleeve 5, a guide seat 15, a first steel ball 4, a valve seat 16, a steel ball push rod 17, a second steel ball 6 and the guide seat 15 into the cutting sleeve 3;
b: the bushing 7, the armature 12, the stop block 14 and the armature push rod 13 are installed in the sleeve 9, and the cutting sleeve 3 and the sleeve 9 are screwed until the positioning sleeve 5 is tightly pressed against the stop block 14;
c: the dial indicator 11 is clamped into the other end of the sleeve 9, a certain pre-tightening amount is applied and the sleeve is locked by a screw, at the moment, the armature 12 is pushed by the self elasticity of the dial indicator 11 to push the armature push rod 13 to the bottom of the stop block 14, and a gap is generated between the valve seat 16 and the guide seat 15;
d: the dial indicator 11 is calibrated, the thimble bolt 2 is screwed into the other end of the cutting sleeve 3, the valve seat 16 is pushed at the moment, when the valve seat 16 is attached to the guide seat 15, namely, under the state that the thimble bolt 2 is screwed, the indicating number of the dial indicator 11 at the moment is read, and the indicating value of the dial indicator is the residual stroke of the armature push rod 13;
s2: remaining stroke L of armature tappet 13: considering the method for detecting the protrusion amount of the armature push rod 13 in a combined manner, a center hole is formed in the center of the ejector bolt 2 and extends into the ejector pin 1, the ejector pin 1 directly pushes a first steel ball 4 in the valve seat 16, the first steel ball 4 pushes against the valve seat 16 to push forwards, when the valve seat 16 is attached to the guide seat 15, the amount of movement of the ejector pin 1 is the protrusion amount of the armature push rod 13, and the detection method comprises the following steps:
a: after the residual stroke of the armature push rod 13 is measured, the thimble bolt 2 is unscrewed to return the dial indicator 11 to zero, and the thimble 1 is inserted into the center hole of the thimble bolt 2 to push the second steel ball 6;
b: when the valve seat 16 is attached to the guide seat 15, the thimble 1 stops, the number of the dial indicator 11 at the moment is read, and the indication value of the dial indicator 11 is the projection L of the armature push rod 13;
s3: working stroke S of the steel ball: according to the formula, the protrusion amount L of the armature push rod 13 is equal to the residual stroke E of the armature push rod 13 and the working stroke S of the steel ball, and the detection method comprises the following steps:
a: and (3) screwing the thimble bolt 2, attaching the valve seat 16 to the guide seat 15, resetting the dial indicator 11, extending the thimble 1 into the push steel ball 4, reading the indication number of the dial indicator 11 when the thimble 1 stops, and taking the indication value of the dial indicator 11 as the working stroke S of the steel ball.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides a hydraulic solenoid valve electro-magnet position stroke detection device which characterized in that: the steel ball pushing device comprises a positioning sleeve (5) used for sequentially mounting a first steel ball (4), a valve seat (16), a steel ball push rod (17), a second steel ball (6), a guide seat (15), a clamping sleeve (3) used for mounting the positioning sleeve (5), a bushing (7) used for sequentially mounting an armature (12), a stop block (14) and an armature push rod (13), a sleeve (9) used for mounting the bushing (7), an ejector pin bolt (2) arranged at the end, far away from the bushing (7), of the sleeve (9), and an ejector pin (1) arranged at the center of the ejector pin bolt (2) and used for pushing the first steel ball (4) in the valve seat (16).
2. The apparatus according to claim 1, wherein: the clamping sleeve (3) is tightly screwed and matched with the sleeve (9) through threads until the positioning sleeve (5) is tightly pressed with the stop block (14).
3. The apparatus according to claim 1, wherein: and a dial indicator (11) is locked on the end part of the sleeve (9) far away from the sleeve (9) by applying a certain pre-tightening amount and using a screw.
4. The apparatus according to claim 1, wherein: the aperture of the positioning sleeve (5) is compared with the outer diameter of the valve seat (16), and the aperture of the lining (7) is compared with the size of the inner cavity of the electromagnet (22).
5. The apparatus according to claim 1, wherein: the center of the thimble bolt (2) is provided with a center hole for conveniently installing the thimble (1).
6. The detection method using the device for detecting the position stroke of the hydraulic solenoid valve electromagnet according to any one of claims 1 to 5, characterized in that: the method comprises the following specific steps:
s1: residual stroke E of the armature push rod (13): the gap can be measured by pushing the valve seat (16) to the guide seat (15) in the positive direction, and the detection method comprises the following steps:
a: sequentially arranging a positioning sleeve (5), a guide seat (15), a first steel ball (4), a valve seat (16), a steel ball push rod (17), a second steel ball (6) and the guide seat (15) into the cutting sleeve (3);
b: the bushing (7), the armature (12), the stop block (14) and the armature push rod (13) are installed in the sleeve (9), and the clamping sleeve (3) and the sleeve (9) are screwed until the positioning sleeve (5) and the stop block (14) are pressed tightly;
c: the dial indicator (11) is clamped into the other end of the sleeve (9), a certain pre-tightening amount is applied and locked by a screw, at the moment, the armature (12) is pushed by the self elasticity of the dial indicator (11) to push the armature push rod (13) to the bottom of the stop block (14), and a gap is formed between the valve seat (16) and the guide seat (15);
d: zero calibration is carried out on the dial indicator (11), the ejector pin bolt (2) is screwed into the other end of the clamping sleeve (3), the valve seat (16) is pushed at the moment, when the valve seat (16) is attached to the guide seat (15), namely, the ejector pin bolt (2) is in a screwed state, the indication number of the dial indicator (11) at the moment is read, and the indication value of the dial indicator is the residual stroke of the armature push rod (13);
s2: projection amount L of armature tappet (13): the method for detecting the protrusion amount of the armature push rod (13) is considered in a combined manner, a center hole is formed in the center of a thimble bolt (2) and extends into a thimble (1), the thimble (1) directly pushes a first steel ball (4) in a valve seat (16), the first steel ball (4) abuts against the valve seat (16) to be pushed forwards, when the valve seat (16) is attached to a guide seat (15), the movement amount of the thimble (1) is the protrusion amount of the armature push rod (13), and the detection method comprises the following steps:
a: after the residual stroke of the armature push rod (13) is measured, the thimble bolt (2) is unscrewed to return the dial indicator (11) to zero, and then the center hole of the thimble bolt (2) extends into the thimble (1) to push the steel ball II (6);
b: when the valve seat (16) is attached to the guide seat (15), the thimble (1) stops, the number of the dial indicator (11) at the moment is read, and the indication value of the dial indicator (11) is the protrusion L of the armature push rod (13);
s3: working stroke S of the steel ball: according to a formula, the protrusion L of the armature push rod (13) is equal to the residual stroke E of the armature push rod (13) plus the working stroke S of the steel ball, and the detection method comprises the following steps:
a: the thimble bolt (2) is screwed, the valve seat (16) is attached to the guide seat (15), the dial indicator (11) is re-calibrated, the thimble (1) is stretched into the first push steel ball (4), the indication number of the dial indicator (11) at the moment is read out when the thimble (1) stops, and the indication value of the dial indicator (11) is the working stroke S of the steel ball.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010916367.3A CN112067269A (en) | 2020-09-03 | 2020-09-03 | Hydraulic solenoid valve electromagnet position stroke detection device and detection method thereof |
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| CN202010916367.3A CN112067269A (en) | 2020-09-03 | 2020-09-03 | Hydraulic solenoid valve electromagnet position stroke detection device and detection method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112643275A (en) * | 2020-12-29 | 2021-04-13 | 贵州天义电器有限责任公司 | Electromagnetic drive assembly welding position device |
| CN112762796A (en) * | 2021-02-04 | 2021-05-07 | 菏泽广信船配油嘴油泵有限公司 | Special device for precisely measuring lengths of various needle valves |
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2020
- 2020-09-03 CN CN202010916367.3A patent/CN112067269A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112643275A (en) * | 2020-12-29 | 2021-04-13 | 贵州天义电器有限责任公司 | Electromagnetic drive assembly welding position device |
| CN112643275B (en) * | 2020-12-29 | 2023-01-13 | 贵州天义电器有限责任公司 | Electromagnetic drive assembly welding position device |
| CN112762796A (en) * | 2021-02-04 | 2021-05-07 | 菏泽广信船配油嘴油泵有限公司 | Special device for precisely measuring lengths of various needle valves |
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