Dynamic press-fitting method and press-fitting equipment for valve element of electromagnetic valve, electromagnetic valve and application

Abstract

The invention discloses an electromagnetic valve element dynamic press-fitting method, press-fitting equipment, an electromagnetic valve and application, and belongs to the field of electromagnetic valve element press-fitting. S2, pre-pressing is carried out; s4, judging: calculating K = K2-K1, judging whether K is greater than a minimum value of a set range, if so, executing a step S5, and if not, executing a step S6; s5, stroke fine adjustment is conducted, specifically, the upper pressing head continues to move downwards at the press-fitting speed, the static core is pressed downwards till the static core moves by a set distance, the upper pressing head stops moving downwards, the coil is powered on again, the movable core is driven to move upwards, the position K2 of the movable core at the moment is updated through an LVDT displacement sensor, and the updated K2 is input into the step S4 again; s6, remeasuring the stroke; and S7, discharging. By the adoption of the dynamic press-fitting method and device for the valve element of the electromagnetic valve, the electromagnetic valve and the application, the press-fitting precision is guaranteed through dynamic press-fitting of the static core.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valve spool press-fitting, and particularly relates to a dynamic press-fitting method for a solenoid valve spool, a press-fitting device, a solenoid valve and an application. Background Art

[0002] In order to ensure a precise fit between the spool and the valve body of a solenoid valve, avoid fluid leakage or movement jamming, and ensure its sealing performance under harsh working conditions such as high pressure and vacuum, it is necessary to accurately monitor and control the press-fitting stroke of the spool.

[0003] The existing press-fitting process for solenoid valves generally includes the following steps:

[0004] 1. High-speed pre-press stage: The servo press drives the upper press head to move downward at a relatively high speed (e.g., 500 mm / s) to a preset point close to the target position of the spool (such as 1 mm away from the target position). The main purpose of this stage is to quickly position the upper press head close to the final press-fitting position and reduce the time for subsequent low-speed press-in.

[0005] 2. Low-speed fine-press stage: When the upper press head reaches the preset position, the system switches to the low-speed mode (e.g., 50 mm / s) to complete the initial press-in of the spool at a lower speed. This low-speed operation helps to ensure the accuracy during the press-fitting process and avoid impacts and damages caused by too high a speed.

[0006] It can be seen that the existing press-fitting process essentially belongs to a static press-fitting method, that is, the press-fitting is completed at a fixed speed and path. This method has the following potential problems:

[0007] 1. Deviations caused by inconsistent models: Solenoid valves of different models may have different structural dimensions, resulting in differences in actual press-fitting results even under the same set conditions, which makes it difficult to accurately control the actual position of the spool.

[0008] 2. Influence of material properties: Different hardness, elastic modulus and other factors of the spool and valve body materials will affect the degree of deformation during the press-fitting process. If the material properties change, the same press-fitting parameters may lead to different final position deviations.

[0009] Due to the above reasons, when there is a deviation in the position of the stationary spool (the fixed part in the valve body), the relative stroke between the moving spool (the moving part) that cooperates with it in motion will not reach the expected value, thus affecting the overall performance and even possibly leading to seal failure or mechanical failures. Summary of the Invention

[0010] The purpose of the present invention is to provide a dynamic press-fitting method for a solenoid valve spool, a press-fitting device, a solenoid valve and an application, so as to solve the above technical problems.

[0011] To achieve the above object, the present invention provides a dynamic press-fitting method for a solenoid valve spool, comprising the following steps:

[0012] S1. Loading: Place the movable core of the solenoid valve to be press-fitted on the lower pressing head of the press-fitting device. At this time, the static core of the solenoid valve to be press-fitted is aligned with the upper pressing head of the press-fitting device;

[0013] S2. Pre-pressing: The upper pressing head of the press-fitting device descends at a downward speed until it contacts the static core of the solenoid valve to be press-fitted, and then descends at a pre-pressing speed until the static core is press-fitted to the first preset position, and then descends at a press-fitting speed until the second preset position. The upper pressing head stops descending, and the original position K1 of the movable core is collected by the LVDT displacement sensor;

[0014] S3. Stroke determination: The coil in the upper pressing head is energized, and the movable core is driven to ascend under the action of electromagnetic force, compressing the spring between the static core and the movable core until the top end of the movable core fits with the bottom end of the static core. The position K2 of the movable core at this time is collected by the LVDT displacement sensor, and the coil is powered off. The movable core resets under the action of the spring restoring force and its own gravity;

[0015] S4. Judgment: Calculate △K = |K2 - K1|, and judge whether △K is greater than the minimum value of the set range. If so, execute step S5; otherwise, execute step S6;

[0016] S5. Stroke fine-tuning: The upper pressing head continues to descend at the press-fitting speed, pressing down the static core until the static core moves a set distance. The upper pressing head stops descending, the coil is energized again, driving the movable core to ascend until the top end of the movable core fits with the bottom end of the static core. The position K2 of the movable core at this time is updated by the LVDT displacement sensor, and the updated K2 is re-input into step S4. The coil is powered off, and the movable core resets under the action of the spring restoring force and its own gravity;

[0017] S6. Stroke re-measurement: The coil is energized, driving the movable core to ascend until the top end of the movable core fits with the bottom end of the static core. The position K2 of the movable core at this time is updated by the LVDT displacement sensor, and the updated K2 is re-input into step S4. Calculate △K', and further calculate whether △K' is greater than the minimum value of the set range. If so, execute step S5; otherwise, execute step S7;

[0018] S7. Unloading: The upper pressing head ascends and resets, and takes out the press-fitted solenoid valve.

[0019] Preferably, in step S2, the downward speed is 200 mm / s, the pre-pressing speed is 50 mm / s, and the press-fitting speed is 0.02 mm / s.

[0020] Preferably, in step S4, the minimum value of the set range is 0.02 mm.

[0021] Preferably, in step S5, the distance is set to be the median value of the press-fitting stroke.

[0022] A press-fitting device comprises a machine base, a lower press head fixed on the machine base, an upper press head arranged directly above the lower press head, and a hydraulic cylinder for driving the upper press head downward, wherein the bottom end of the lower press head is connected to the LVDT displacement sensor core via a detection needle, a positioning groove for clamping a press-fitting electromagnetic valve is provided at the top of the lower press head, a press column is arranged inside the upper press head at a position corresponding to the positioning groove, a coil is sleeved on the outside of the press column, the LVDT displacement sensor is connected to the input end of a controller, the output end of the controller is respectively connected to the hydraulic cylinder and the coil, and the controller is equipped with a control program for executing the electromagnetic valve core press-fitting method.

[0023] The solenoid valve obtained based on the solenoid valve core press-fitting method has a stroke accuracy of 0.01mm.

[0024] The application of solenoid valves obtained based on the solenoid valve core press-fit method in automobile braking.

[0025] Therefore, the present invention adopts the above-mentioned solenoid valve core dynamic press-fitting method, press-fitting equipment, solenoid valve and application, which has the following beneficial effects:

[0026] 1. Dynamic adjustment mechanism: By introducing the dynamic press-fitting method, the static core can be fine-tuned and re-measured during the press-fitting process to ensure that the press-fitting accuracy reaches 0.01mm, which significantly improves the manufacturing accuracy of the solenoid valve;

[0027] 2. By dynamically adjusting the pressing parameters, the influence of different material properties on the pressing results can be effectively dealt with, ensuring the stability of the pressing quality;

[0028] 3. Combination of pre-pressing and precision pressing: The pre-pressing stage approaches the target position at a faster speed to reduce the time for subsequent low-speed pressing; the precision pressing stage is carried out at a low speed to ensure the pressing accuracy and improve the overall pressing efficiency.

[0029] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of a solenoid valve core dynamic press-fitting method according to the present invention;

[0031] Figure 2 is an outline diagram of the press-fitting device of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the upper pressing head of the pressing device of the present invention;

[0033] Figure 4 It is a schematic diagram of the structure of the lower pressing head of the pressing device of the present invention;

[0034] Figure 5 This is a sectional view showing the cooperation between the upper punch and the lower punch of the press-fitting device according to the present invention.

[0035] Reference numerals

[0036] 1. Machine base; 2. Lower punch; 3. Upper punch; 31. Pressure column; 32. Coil; 4. Hydraulic cylinder; 5. Detection needle; 6. LVDT displacement sensor; 7. Solenoid valve to be press-fitted; 71. Stationary core; 72. Spring; 73. Moving core. Detailed implementation manners

[0037] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following further describes the embodiments of the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout.

[0038] It should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or server that includes a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0039] The following describes the embodiments of the present invention in detail with reference to the accompanying drawings.

[0040] As Figure 1 shown, a dynamic press-fitting method for a solenoid valve spool includes the following steps:

[0041] S1. Feeding: Place the moving core 73 of the solenoid valve 7 to be press-fitted on the lower punch 2 of the press-fitting device. At this time, the stationary core 71 of the solenoid valve 7 to be press-fitted is aligned with the upper punch 3 of the press-fitting device.

[0042] S2. Pre-pressing: The upper punch 3 of the press-fitting device descends at a downward speed until it contacts the stationary core 71 of the solenoid valve 7 to be press-fitted, and then descends at a pre-pressing speed until the stationary core 71 is press-fitted to the first preset position (the first preset position in this embodiment is the pre-pressing position), and then descends at a press-fitting speed until the second preset position (the second preset position is the limit press-fitting position). The upper punch 3 stops descending, and the LVDT displacement sensor 6 is used to collect the original position K1 of the moving core 73.

[0043] In step S2, the downward speed is 200 mm / s, the preloading speed is 50 mm / s, and the pressing speed is 0.02 mm / s.

[0044] S3. Stroke determination: The coil 32 inside the upper pressure head 3 is energized, and under the action of electromagnetic force, the moving core 73 is driven to move upward, compressing the spring 72 between the static core 71 and the moving core 73 until the top end of the moving core 73 fits against the bottom end of the static core 71. The position K2 of the moving core 73 is collected by the LVDT displacement sensor 6 at this time. Then the coil 32 is de-energized, and the moving core 73 resets under the restoring force of the spring 72 and its own gravity.

[0045] S4. Judgment: Calculate ΔK = |K2 - K1|, and determine whether ΔK is greater than the minimum value of the set range. If so, execute step S5; otherwise, execute step S6.

[0046] In step S4, the minimum value of the set range is 0.02 mm.

[0047] S5. Fine stroke adjustment: The upper pressure head 3 continues to move downward at the pressing speed, pressing down the static core 71 until the static core 71 moves a set distance. Then the upper pressure head 3 stops moving downward. The coil 32 is energized again, driving the moving core 73 to move upward until the top end of the moving core 73 fits against the bottom end of the static core 71. The LVDT displacement sensor 6 updates the position K2 of the moving core 73 at this time, and the updated K2 is re-input to step S4. Then the coil 32 is de-energized, and the moving core 73 resets under the restoring force of the spring 72 and its own gravity.

[0048] In step S5, the set distance is the median value of the pressing stroke.

[0049] S6. Stroke re-measurement: The coil 32 is energized, driving the moving core 73 to move upward until the top end of the moving core 73 fits against the bottom end of the static core 71. The LVDT displacement sensor 6 updates the position K2 of the moving core 73 at this time, and the updated K2 is re-input to step S4. Calculate ΔK', and further determine whether ΔK' is greater than the minimum value of the set range. If so, execute step S5; otherwise, execute step S7.

[0050] S7. Unloading: The upper pressure head 3 moves upward to reset, and the pressed solenoid valve is taken out.

[0051] As Figures 2 - 5As shown in the figure, a press-fitting device includes a machine base 1, a lower press head 2 fixed on the machine base 1, an upper press head 3 arranged directly above the lower press head 2, and a hydraulic cylinder 4 for driving the upper press head 3 to move downward. The bottom end of the lower press head 2 is connected to the iron core of an LVDT displacement sensor 6 through a detection needle 5. A positioning groove for clamping a solenoid valve core to be press-fitted 7 is provided at the top end of the lower press head 2. A pressure column 31 is arranged inside the upper press head 3 corresponding to the position of the positioning groove. A coil 32 is sleeved outside the pressure column 31. The LVDT displacement sensor 6 is connected to the input end of a controller. The output end of the controller is respectively connected to the hydraulic cylinder 4 and the coil 32. A control program for executing the solenoid valve core press-fitting method is loaded in the controller.

[0052] The solenoid valve obtained based on the solenoid valve core press-fitting method has a stroke accuracy of 0.01 mm.

[0053] Application of the solenoid valve obtained based on the solenoid valve core press-fitting method in automotive braking.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for dynamically pressing a solenoid valve core, characterized in that: The following steps are involved: S1, loading: Place the moving core of the solenoid valve to be press-fitted on the lower pressure head of the press-fitting equipment, and align the static core of the solenoid valve to be press-fitted with the upper pressure head of the press-fitting equipment; S2, pre-pressing: the upper pressure head of the press-fitting equipment moves downward at the downward speed until it contacts the static core of the solenoid valve to be press-fitted, and then moves downward at the pre-pressing speed until the static core is press-fitted to the first preset position, and then moves downward at the press-fitting speed until the second preset position, the upper pressure head stops moving downward, and the original position K1 of the dynamic core is collected by using the LVDT displacement sensor; S3, stroke determination: the coil in the upper pressure head is energized, and the moving core is driven upward by the electromagnetic force, compressing the spring between the static core and the moving core until the top of the moving core fits with the bottom of the static core. The position K2 of the moving core at this time is collected by the LVDT displacement sensor, and the coil is de-energized, and the moving core is reset by the spring restoring force and its own gravity; S4, judgment: calculate △K=|K2-K1|, and judge whether △K is greater than the minimum value of the set range, if so, execute step S5, otherwise execute step S6; S5, stroke fine adjustment: the upper pressure head continues to move downward at the press speed, pressing down the static core until the static core moves the set distance, the upper pressure head stops moving downward, the coil is energized again, driving the moving core upward until the top of the moving core fits the bottom of the static core, and the LVDT displacement sensor is used to update the position K2 of the moving core at this time, and the updated K2 is re-input into step S4, the coil is de-energized, and the moving core is reset under the action of the spring restoring force and its own gravity; S6, stroke retest: the coil is energized to drive the moving core upward until the top of the moving core is in contact with the bottom of the static core, and the position K2 of the moving core at this time is updated by the LVDT displacement sensor, and the updated K2 is re-input into step S4 to calculate △K′, and then calculate whether △K′ is greater than the minimum value of the set range. If so, execute step S5, otherwise execute step S7; S7, unloading: the upper pressure head moves upward and resets, and the pressed solenoid valve is taken out.

2. A solenoid valve core dynamic press-fitting method according to claim 1, characterized in that: In step S2, the downward speed is 200 mm / s, the pre-pressing speed is 50 mm / s, and the pressing speed is 0.02 mm / s.

3. A method for dynamically pressing a solenoid valve core according to claim 1, characterized in that: In step S4, the minimum value of the range is set to 0.02 mm.

4. A solenoid valve core dynamic press-fitting method according to claim 1, characterized in that: In step S5, the distance is set to the median value of the press-fitting stroke.

5. A press-fitting device, comprising a machine base, a lower press head fixed on the machine base, an upper press head arranged just above the lower press head, and a hydraulic cylinder for driving the upper press head downward, wherein the bottom end of the lower press head is connected to the LVDT displacement sensor core via a detection needle, a positioning groove for clamping a press-fitting electromagnetic valve is provided at the top of the lower press head, a pressure column is arranged inside the upper press head and at a position corresponding to the positioning groove, and a coil is sleeved on the outer side of the pressure column, characterized in that: The LVDT displacement sensor is connected to the input end of the controller, and the output end of the controller is connected to the hydraulic cylinder and the coil respectively. The controller is equipped with a control program for executing the electromagnetic valve core pressing method described in any one of claims 1 to 4.

6. A solenoid valve obtained by the solenoid valve core press-fitting method according to any one of claims 1 to 4, characterized in that: Its stroke accuracy is 0.01mm.

7. Application of the solenoid valve obtained by the solenoid valve core press-fitting method as described in claim 6 in automobile braking.

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