A kind of pad selection device and pad selection method of fuel injector

Abstract

The present invention provides a gasket selection device and a gasket selection method for a fuel injector, the device comprising: a fuel injector, a first measuring device, a second measuring device and a pop-up device; the fuel injector comprises a body, a needle valve, a target gasket and a sealing part; the body is sleeved outside the needle valve; the end face of the body extends outward from the end face of the needle valve; the end face of the body contacts the first end face of the target gasket; the sealing part is placed inside the target gasket; the first end face of the sealing part contacts the position of the end face of the needle valve close to the needle valve, and the second end face of the sealing part is flush with the second end face of the target gasket; the first measuring device is used to measure the relative height value between the end face of the body and the end face of the needle valve; the second measuring device is used to measure the sealing height value of the sealing part; the pop-up device is used to pop out the target gasket according to the assembly relationship of the fuel injector, the gap setting value of the fuel injector, the relative height value between the end face of the body and the end face of the needle valve and the sealing height value of the sealing part. The present invention can select gaskets efficiently, conveniently and accurately.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel injectors, and in particular relates to a gasket selection device and a gasket selection method for a fuel injector. Background Art

[0002] The existing pad selection measuring device is not applied in the field of fuel injector technology, but is generally only applied to gearboxes and reducers. However, due to the obvious differences between the types of gearboxes and reducers and fuel injectors, the processing logic of the measurement points and measurement dimensions of the pad selection device of the gearbox and reducer cannot be applied to the pad selection measuring device of the fuel injector. Summary of the invention

[0003] The object of the present invention is to provide a fuel injector gasket selection device and a fuel injector gasket selection method in view of the deficiencies in the prior art.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions: a gasket selection device for an injector, comprising: an injector, a first measuring device, a second measuring device and a pop-up device; the injector comprises a body, a needle valve, a target gasket and a sealing portion; the body is sleeved on the outside of the needle valve; the end surface of the body extends outward from the end surface of the needle valve; the end surface of the body contacts the first end surface of the target gasket; the sealing portion is placed inside the target gasket; the first end surface of the sealing portion contacts the position of the needle valve close to the end surface of the needle valve, and the second end surface of the sealing portion is flush with the second end surface of the target gasket; the first measuring device is used to measure the relative height value between the end surface of the body and the end surface of the needle valve; the second measuring device is used to measure the sealing height value of the sealing portion; the pop-up device is used to pop out the target gasket according to the assembly relationship of the injector, the gap setting value of the injector, the relative height value between the end surface of the body and the end surface of the needle valve, and the sealing height value of the sealing portion.

[0005] In a specific embodiment, the assembly relationship of the injector includes the sum of the relative height value of the end face of the body and the end face of the needle valve and the thickness value of the target gasket being equal to the sum of the clearance setting value of the injector and the sealing height value of the sealing portion.

[0006] In a specific embodiment, the clearance setting value of the injectors of the same model is a constant value.

[0007] In a specific embodiment, the first measuring device includes: a first bracket part, a first lower mechanism, a first upper mechanism and a controller; the first lower mechanism is arranged at the lower part of the first bracket part; the first lower mechanism includes a first support part, a rotatable clamp part and a first retractable part; the first support part is fixedly connected to the first bracket part; the rotatable clamp part and the first support part are rotatably connected together; the rotatable clamp part is used to place and clamp the body and the needle valve; the first retractable part is arranged below the first support part and is fixedly connected to the first bracket part; the extended end of the first retractable part is used to reciprocate left and right and push the rotatable clamp part to rotate when moving in a direction close to the rotatable clamp part, so that the rotatable clamp part and the body and the needle valve in the rotatable clamp part are all arranged vertically; the first upper mechanism is arranged at the upper part of the first bracket part and is located above the rotatable clamp part; the first upper mechanism includes a second retractable part, a first position detection part, a first displacement detection part, a first detection head and a first outer sleeve; the second retractable The retractable portion is fixedly connected to the first bracket portion; the extended end of the second retractable portion is fixedly connected to the first displacement detection portion, the first detection head portion and the first outer sleeve portion and is used for reciprocating up and down; the first position detection portion is arranged on the second retractable portion and is used for detecting the position of the body and the needle valve located in the rotatable clamp portion; the second retractable portion, the first displacement detection portion, the first detection head portion and the first outer sleeve portion are all arranged vertically; the first detection head portion and the first outer sleeve portion are both connected to the first displacement detection portion through a first connecting portion; the first end face of the first detection head portion is used for contacting the end face of the needle valve; the first outer sleeve portion is sleeved on the outside of the first detection head portion; the first end face of the first outer sleeve portion is used for contacting the end face of the body; the first displacement detection portion is used to measure the relative height value of the end face of the body and the end face of the needle valve through the relative displacement value of the first detection head portion; the first retractable portion, the second retractable portion, the first position detection portion and the first displacement detection portion are all electrically connected to the controller.

[0008] In a specific embodiment, the rotatable clamp part includes: a rotatable plate, a first clamp and a second clamp; the rotatable plate is rotatably connected to the first supporting part; the first clamp is fixedly connected to the rotatable plate; a first accommodating cavity is provided inside the first clamp; the second clamp is movably provided in the first accommodating cavity and is used to clamp the body and the needle valve located in the second clamp.

[0009] In a specific embodiment, the first connecting part includes: a first clamping block, a first linear axis, a first guide seat and a first mounting head; the first clamping block, the first linear axis, the first guide seat and the first mounting head are all arranged vertically; the first clamping block is sleeved on the outside of the lower part of the first displacement detecting part and is used to fix the first displacement detecting part; the bottom of the first clamping block is fixedly connected to the top of the first guide seat; the first linear axis is slidably arranged in the first guide seat; the first end of the first linear axis contacts the detection head of the first displacement detecting part, and the second end of the first linear axis is connected to the second end of the first detection head through the first mounting head; the first guide seat is fixedly connected to the second telescopic part; the second end of the first outer sleeve is fixedly connected to the first guide seat.

[0010] In a specific embodiment, the axial outer wall of the first linear shaft is connected to the axial inner wall of the first guide seat through a first bearing portion and a first spacer portion.

[0011] In a specific embodiment, the first bearing portion includes a plurality of first bearings, and the first spacer portion is disposed between two adjacent first bearings.

[0012] In a specific embodiment, the first position detection unit includes a position sensor, the first displacement detection unit includes a displacement sensor, and the first detection head includes a spherical detection head.

[0013] In a specific embodiment, the first telescopic part and the second telescopic part both include a slide cylinder.

[0014] In a specific embodiment, the rotatable plate is connected to the top of the first fixture via a guide key.

[0015] In a specific embodiment, the extended end of the first retractable portion is used to push the rotatable clamp portion to rotate by contacting with the bottom of the first clamp when moving in a direction close to the rotatable clamp portion.

[0016] In a specific embodiment, the second retractable portion is connected to the first bracket portion through a first pad.

[0017] In a specific embodiment, a first rib plate is provided on a side of the first bracket portion facing away from the first pad, and a bottom of the first rib plate is fixedly connected to the first supporting portion.

[0018] In a specific embodiment, the first bracket portion includes a first vertical plate disposed vertically, and the first support portion includes a first bottom plate disposed horizontally.

[0019] In a specific embodiment, the second measuring device includes: a second bracket part, a second lower mechanism, a second upper mechanism and the controller; the second lower mechanism is arranged at the lower part of the second bracket part; the second lower mechanism includes a second support part and a support block arranged in the second support part; a boss for placing and supporting the sealing part is arranged on the top of the support block; the second end surface of the sealing part is in contact with the top surface of the boss; the second upper mechanism is arranged at the upper part of the second bracket part and is located above the support block; the second upper mechanism includes a third retractable part, a second position detection part, a second displacement detection part and a second detection head; the third retractable part is fixedly connected to the second bracket part; the extension of the third retractable part The output end is fixedly connected to the second displacement detection part and the second detection head and is used for reciprocating up and down; the second position detection part is arranged on the third telescopic part and is used for detecting the position of the sealing part located on the boss; the third telescopic part, the second displacement detection part and the second detection head are all arranged vertically; the first end of the second detection head is connected to the second displacement detection part through the second connecting part; the second end of the second detection head is used for contacting with the groove surface of the sealing part; the second displacement detection part is used for measuring the sealing height value of the sealing part through the relative displacement value of the second detection head; the third telescopic part, the second position detection part and the second displacement detection part are all electrically connected to the controller.

[0020] In a specific embodiment, the second connecting part includes: a second clamping block, a second linear shaft, a second guide seat and a second mounting head; the second clamping block, the second linear shaft, the second guide seat and the second mounting head are all arranged vertically; the second clamping block is sleeved on the outside of the lower part of the second displacement detecting part and is used to fix the second displacement detecting part; the bottom of the second clamping block is fixedly connected to the top of the second guide seat; the second linear shaft is slidably arranged in the second guide seat; the first end of the second linear shaft contacts the detection head of the second displacement detecting part, and the second end of the second linear shaft is connected to the first end of the second detection head through the second mounting head; the second guide seat is fixedly connected to the third telescopic part.

[0021] In a specific embodiment, the second measuring device further includes a second outer sleeve, a first end of the second outer sleeve is fixedly connected to the bottom of the second guide seat, and a second end of the second outer sleeve is used to be sleeved on the outside of the second mounting head and / or the second detection head.

[0022] In a specific embodiment, the axial outer wall of the second linear shaft is connected to the axial inner wall of the second guide seat through a second bearing portion and a second spacer portion.

[0023] In a specific embodiment, the second bearing portion includes a plurality of second bearings, and the second spacer portion is disposed between two adjacent second bearings.

[0024] In a specific embodiment, two spaced-apart support ribs are provided on the support portion near the top of the support block, and two opposite side surfaces of the two support ribs are arc-shaped surfaces, and a cylindrical space is formed between the two opposite side surfaces for placing the sealing portion, and the boss is arranged in the cylindrical space.

[0025] In a specific embodiment, the second position detection portion includes a position sensor, the second displacement detection portion includes a displacement sensor, and the second detection head includes a spherical detection head.

[0026] In a specific embodiment, the third retractable portion includes a slide cylinder.

[0027] In a specific embodiment, the third retractable portion is connected to the second bracket portion via a second pad.

[0028] In a specific embodiment, a second rib plate is provided on a side of the second bracket portion facing away from the second pad, and a bottom of the second rib plate is fixedly connected to the second supporting portion.

[0029] In a specific embodiment, the second bracket portion includes a second vertical plate disposed vertically, and the second support portion includes a second bottom plate disposed horizontally.

[0030] In a specific embodiment, the pop-up device includes: a plurality of fourth retractable parts, a plurality of guide rails, a third support part, a third bracket part, a plurality of material holding parts and the controller; the plurality of fourth retractable parts are electrically connected to the controller; the extended end of each fourth retractable part is fixedly connected to the first end of a guide rail and is used to drive the guide rail to reciprocate forward and backward; a plurality of slideways are arranged on the third support part in the left and right directions; each of the slideways passes through the front and rear end surfaces of the third support part; the second end of each guide rail can be slidably arranged in one of the slideways; the bottom of the third bracket part The part is fixedly connected to the top of the third supporting part; a plurality of the material holding parts are arranged on the third bracket part along the left-right direction; each of the material holding parts is vertically arranged in the third bracket part and correspondingly arranged above one of the slides; a plurality of the material holding parts are used to place a plurality of gasket groups of different thicknesses; each of the material holding parts is used to place a gasket group of the same thickness; an opening is provided at the bottom of each of the material holding parts for the gaskets in the gasket group to fall into the corresponding slide; the target gasket falling into the slide is pushed out of the slide when the second end of the corresponding guide rail moves forward.

[0031] In a specific embodiment, the ejection device includes a baffle portion disposed at the front side of the third support portion, and the target pad is pushed out of the slideway by the second end of the guide rail and enters the baffle portion.

[0032] In a specific embodiment, the pop-up device further includes a supporting platform, and the third retractable portion, the third supporting portion, and the baffle portion are all arranged on the supporting platform.

[0033] In a specific embodiment, the support platform includes: a vertically arranged support plate and a horizontally arranged third bottom plate, and the top of the support plate is fixedly connected to the bottom of the third bottom plate.

[0034] In a specific embodiment, there are multiple support plates, and the multiple support plates are arranged at intervals.

[0035] In a specific embodiment, each of the fourth retractable parts is connected to the third base plate via a mounting plate.

[0036] In a specific embodiment, the fourth retractable portion includes a slide cylinder, the material holding portion includes a barrel, and the third supporting portion includes a supporting plate.

[0037] In a specific embodiment, the controller includes: at least one processor; and a memory connected to the processor; wherein the memory stores calculation value program instructions that can be executed by the processor, and when the instructions are executed by the processor, the processor performs corresponding operations to drive the extension end of the first retractable part, the extension end of the second retractable part, the extension end of the third retractable part and / or the extension end of the fourth retractable part to move.

[0038] A gasket selection method for an injector is applied to the gasket selection device; the injector comprises a body, a needle valve, a target gasket and a sealing part; the body is sleeved on the outside of the needle valve; the end face of the body extends outward from the end face of the needle valve; the end face of the body contacts the first end face of the target gasket; the sealing part is placed inside the target gasket; the first end face of the sealing part contacts the position of the needle valve close to the end face of the needle valve, and the second end face of the sealing part is flush with the second end face of the target gasket; the method comprises the following steps: determining the assembly relationship of the injector; measuring the relative height value between the end face of the body and the end face of the needle valve by a first measuring device; measuring the sealing height value of the sealing part by a second measuring device; and popping out the target gasket by a pop-up device according to the assembly relationship of the injector, the gap setting value of the injector, the relative height value between the end face of the body and the end face of the needle valve, and the sealing height value of the sealing part.

[0039] In a specific embodiment, the assembly relationship of the injector includes the sum of the relative height value of the end face of the body and the end face of the needle valve and the thickness value of the target gasket being equal to the sum of the clearance setting value of the injector and the sealing height value of the sealing portion.

[0040] In a specific embodiment, the clearance setting value of the injectors of the same model is a constant value.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. The injector pad selection device of the present invention has a high degree of automation and intelligence, which can make the pad selection process more efficient and convenient, and the pad selection result more accurate.

[0043] 2. The fuel injector gasket selection device of the present invention has a simple structure, is easy to use, and has good stability and reliability.

[0044] 3. The fuel injector selection device of the present invention can save manpower and material resources, has good economy and safety.

[0045] 4. The gasket selection process of the fuel injector gasket selection method of the present invention is simple and efficient, with high accuracy and good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A structural schematic diagram showing a specific embodiment of the assembly relationship of the fuel injector of the present invention;

[0047] Figure 2 A schematic structural diagram showing a specific embodiment of a first measuring device of a fuel injector selection device of the present invention;

[0048] Figure 3 A cross-sectional schematic diagram showing a specific embodiment of a first measuring device of a fuel injector pad selection device of the present invention;

[0049] Figure 4 A schematic diagram of the three-dimensional structure of a specific embodiment of the second measuring device of the fuel injector selection device of the present invention is shown;

[0050] Figure 5 A schematic structural diagram showing a specific embodiment of a second measuring device of a fuel injector selection device of the present invention;

[0051] Figure 6 A cross-sectional schematic diagram showing a specific embodiment of a second measuring device of a fuel injector selection device of the present invention;

[0052] Figure 7 A schematic three-dimensional structure diagram showing a specific embodiment of an ejection device of a gasket selection device of an injector of the present invention;

[0053] Figure 8 A schematic structural diagram showing a specific embodiment of an ejection device of a fuel injector selection device of the present invention;

[0054] Fig. 9 Shows Figure 8 A schematic cross-sectional view along the AA direction;

[0055] Fig.10 A schematic flow chart of a specific embodiment of the method for selecting a gasket for a fuel injector of the present invention is shown.

[0056] Among them, 1-injector; 11-body; 12-needle valve; 13-target gasket; 14-sealing part; 141-first end surface of the sealing part 14; 142-second end surface of the sealing part 14; 143-groove surface; 2-first measuring device; 20-first bracket part; 21-first supporting part; 22-rotatable clamp part; 221-rotatable plate; 222-first clamp; 223-second clamp; 224-guide key; 23-first telescopic part; 24-second telescopic portion; 25-first position detection portion; 26-first displacement detection portion; 27-first detection head; 271-first end surface of the first detection head 27; 28-first outer sleeve; 281-first end surface of the first outer sleeve 28; 29-first connecting portion; 291-first clamping block; 292-first linear axis; 293-first guide seat; 294-first mounting head; 295-first bearing portion; 2951-first bearing; 296 - first spacer; 3- second measuring device; 30- second bracket; 31- second support; 311- support rib; 3111- side; 32- support block; 321- boss; 33- third telescopic part; 34- second position detection part; 35- second displacement detection part; 36- second detection head; 37- second connecting part; 371- second clamping block; 372- second linear axis; 373- second guide seat; 374- second mounting head; 375 -second bearing portion; 3751-second bearing; 376-second spacer portion; 38-second outer sleeve portion; 4-pop-up device; 41-fourth telescopic portion; 42-guide rail; 43-third support portion; 431-slideway; 44-third bracket portion; 45-material holding portion; 451-opening; 46-baffle portion; 47-support platform; 471-support plate; 472-third bottom plate; 48-mounting plate; 5-first pad; 6-first rib plate; 7-second rib plate. DETAILED DESCRIPTION

[0057] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0058] Directional terms such as "inside", "outside", "left", "right", "front", "rear", "upper", "lower", "vertical", etc. mentioned in the present invention are only used to refer to the attached drawings. Therefore, the directional terms used are used to explain and understand the present invention, but not to limit the present invention.

[0059] like Figures 1 to 9 As shown, the fuel injector pad selection device of the present invention comprises: a fuel injector 1, a first measuring device 2, a second measuring device 3 and an ejecting device 4.

[0060] The fuel injector 1 includes a body 11 , a needle valve 12 , a target gasket 13 and a sealing portion 14 .

[0061] The body 11 is sleeved on the outside of the needle valve 12. The end surface of the body 11 extends outward from the end surface of the needle valve 12. The end surface of the body 11 contacts the first end surface of the target gasket 13. The sealing portion 14 is placed inside the target gasket 13. The first end surface 141 of the sealing portion 14 contacts the position of the needle valve 12 close to the end surface of the needle valve 12. The second end surface 142 of the sealing portion 14 is flush with the second end surface of the target gasket 13.

[0062] The first measuring device 2 is used to measure the relative height value between the end surface of the body 11 and the end surface of the needle valve 12 .

[0063] The second measuring device 3 is used to measure the sealing height value of the sealing portion 14 .

[0064] The ejection device 4 is used to eject the target gasket 13 according to the assembly relationship of the injector 1, the clearance setting value of the injector 1, the relative height value between the end surface of the body 11 and the end surface of the needle valve 12, and the sealing height value of the sealing part 14.

[0065] When in use, the assembly relationship of the injector 1 is determined. The relative height value between the end face of the body 11 and the end face of the needle valve 12 is measured by the first measuring device 2, and the sealing height value of the sealing portion 14 is measured by the second measuring device 3. The pop-up device 4 can automatically calculate the thickness value of the target gasket 13 and automatically pop out the target gasket 13 according to the assembly relationship of the injector 1, the clearance setting value of the injector 1 (a known fixed value), the relative height value between the end face of the body 11 and the end face of the needle valve 12, and the sealing height value of the sealing portion 14. It has a high degree of automation and intelligence, a simple and efficient gasket selection process, high accuracy, and good reliability.

[0066] In a specific embodiment, Figure 1 As shown, the assembly relationship of the injector 1 includes that the sum of the relative height value between the end face of the body 11 and the end face of the needle valve 12 and the thickness value of the target gasket 13 is equal to the sum of the gap setting value of the injector 1 and the sealing height value of the sealing portion 14. Specifically, the gap setting value of the injector 1 is defined as Plunger Stroke, the relative height value between the end face of the body 11 and the end face of the needle valve 12 is defined as M1, the thickness value of the target gasket 13 is defined as M2, and the sealing height value of the sealing portion 14 is defined as M3. According to the conversion relationship of "Plunger Stroke = M1 + M2-M3", M2 = Plungerstroke + M3-M1 is obtained. Since the gap setting value of the same type of injector 1 is a fixed value, the thickness value of the target gasket 13 can be quickly obtained according to the measured relative height value between the end face of the body 11 and the end face of the needle valve 12 and the sealing height value of the sealing portion 14.

[0067] In a specific embodiment, Figure 2 , Figure 3As shown, the first measuring device 2 includes: a first bracket portion 20, a first lower mechanism, a first upper mechanism and a controller.

[0068] The first lower mechanism is disposed at the lower portion of the first bracket portion 20. The first lower mechanism includes a first supporting portion 21, a rotatable clamp portion 22 and a first retractable portion 23.

[0069] The first supporting portion 21 is fixedly connected to the first bracket portion 20 .

[0070] The rotatable clamping part 22 is rotatably connected to the first supporting part 21 . The rotatable clamping part 22 is used to place and clamp the body 11 and the needle valve 12 .

[0071] The first telescopic portion 23 is disposed below the first supporting portion 21 and is fixedly connected to the first bracket portion 20. The extended end of the first telescopic portion 23 is used to reciprocate left and right and push the rotatable clamp portion 22 to rotate when moving toward the direction close to the rotatable clamp portion 22, so that the rotatable clamp portion 22 and the body 11 and the needle valve 12 in the rotatable clamp portion 22 are all arranged vertically.

[0072] The first upper mechanism is disposed on the upper portion of the first bracket portion 20 and is located above the rotatable clamp portion 22. The first upper mechanism includes a second telescopic portion 24, a first position detection portion 25, a first displacement detection portion 26, a first detection head portion 27 and a first outer sleeve portion 28.

[0073] The second telescopic portion 24 is fixedly connected to the first bracket portion 20. The extended end of the second telescopic portion 24 is fixedly connected to the first displacement detection portion 26, the first detection head portion 27 and the first outer sleeve portion 28 and is used for reciprocating up and down movement.

[0074] The first position detecting portion 25 is disposed on the second retractable portion 24 and is used to detect the positions of the body 11 and the needle valve 12 located within the rotatable clamp portion 22 .

[0075] The second telescopic portion 24 , the first displacement detecting portion 26 , the first detecting head portion 27 and the first outer sleeve portion 28 are all arranged vertically.

[0076] The first detection head portion 27 and the first outer sleeve portion 28 are both connected to the first displacement detection portion 26 via the first connection portion 29 .

[0077] The first end surface 271 of the first detection head 27 is used to contact the end surface of the needle valve 12;

[0078] The first outer sleeve 28 is sleeved on the outside of the first detection head 27. The first end surface 281 of the first outer sleeve 28 is used to contact with the end surface of the body 11.

[0079] The first displacement detection portion 26 is used to measure the relative height value between the end surface of the body 11 and the end surface of the needle valve 12 through the relative displacement value of the first detection head 27 .

[0080] The first retractable portion 23 , the second retractable portion 24 , the first position detecting portion 25 , and the first displacement detecting portion 26 are all electrically connected to the controller.

[0081] When in use, when the body 11 and the needle valve 12 are assembled and placed in the rotatable clamp part 22, the start button of the pad selection device is activated, and the controller controls the operation of the extended end of the first telescopic part 23, and pushes the rotatable clamp part 22 to rotate when moving in the direction close to the rotatable clamp part 22, so that the rotatable clamp part 22 and the body 11 and the needle valve 12 in the rotatable clamp part 22 are all arranged vertically, thereby completing the loading action of the first lower mechanism. When the first lower mechanism completes the loading action, the first position detection part 25 performs position sensing and sends the position information of the body 11 and the needle valve 12 in the rotatable clamp part 22 to the controller, and the controller controls the operation of the extended end of the second telescopic part 24, thereby driving the first displacement detection part 26, the first detection head 27 and the first outer sleeve 28 to move downward to the target position for contact measurement. Before the contact measurement is performed, the first detection head 27 is reset to zero, so that the first end face 271 of the first detection head 27 and the first end face 281 of the first outer cover 28 are at the same height, and the displacement value of the first displacement detection part 26 when the first end face 271 of the first detection head 27 naturally extends downward (due to its own gravity) and is at the lowest position is obtained. When the contact measurement is performed, the first end face 281 of the first outer cover 28 contacts the end face of the body 11, and the first end face 271 of the first detection head 27 contacts the end face of the needle valve 12. At this time, the first detection head 27 moves upward, driving the first displacement detection part 26 to move upward. The relative displacement value of the first detection head 27 is measured according to the displacement signal of the first displacement detection part 26, so as to obtain the relative height value of the end face of the measuring body 11 and the end face of the needle valve 12, and the relative height value is stored in the controller. The process is simple and efficient, with high automation and intelligence, high accuracy and good reliability. At the same time, the first detection head 27 can be used to quickly and accurately find the lowest point of measurement.

[0082] In a specific embodiment, Figure 2 , Figure 3 As shown, the rotatable clamp portion 22 includes a rotatable plate 221 , a first clamp 222 and a second clamp 223 .

[0083] The rotatable plate 221 is rotatably connected to the first supporting portion 21 .

[0084] The first clamp 222 is fixedly connected to the rotatable plate 221. The first clamp 222 is provided with a first accommodating cavity therein.

[0085] The second clamp 223 is movably disposed in the first accommodating cavity and is used to clamp the body 11 and the needle valve 12 located in the second clamp 223 .

[0086] When in use, the second clamp 223 can be withdrawn, so that it can be replaced according to needs and wear conditions, and can improve the stability and reliability of the clamping of the body 11 and the needle valve 12. At the same time, the rotatable plate 221 is rotatably connected to the first support part 21, which can facilitate the placement of the body 11 and the needle valve 12 in the second clamp 223, and the removal of the body 11 and the needle valve 12 placed in the second clamp 223, which is convenient and quick.

[0087] In a specific embodiment, Figure 2 , Figure 3 As shown, the first connecting portion 29 includes: a first clamping block 291 , a first linear shaft 292 , a first guide seat 293 and a first mounting head 294 .

[0088] The first clamping block 291 , the first linear axis 292 , the first guide seat 293 and the first mounting head 294 are all arranged vertically.

[0089] The first clamping block 291 is sleeved on the outside of the lower part of the first displacement detecting part 26 and is used to fix the first displacement detecting part 26. The bottom of the first clamping block 291 is fixedly connected to the top of the first guide seat 293.

[0090] The first linear shaft 292 is slidably disposed in the first guide seat 293. The first end of the first linear shaft 292 contacts the detection head of the first displacement detection unit 26. The second end of the first linear shaft 292 is connected to the second end of the first detection head 27 through the first mounting head 294.

[0091] The first guide seat 293 is fixedly connected to the second telescopic portion 24;

[0092] The second end of the first outer sleeve 28 is fixedly connected to the first guide seat 293 .

[0093] When in use, the first clamping block 291 can be used to fix the first displacement detection unit 26 and improve the stability and reliability of the movement of the first displacement detection unit 26. The first linear shaft 292 can be used to extend the measuring length of the first detection head 27. The sliding cooperation between the first linear shaft 292 and the first guide seat 293 can improve the flexibility, stability and reliability of the operation of the first linear shaft 292. When performing contact measurement, the first detection head 27 moves upward through the first linear shaft 292, thereby driving the detection head of the first displacement detection unit 26 to move upward, which has good stability and reliability, and can improve the accuracy of the detection of the first displacement detection unit 26.

[0094] In a specific embodiment, Figure 3 As shown, the axial outer wall of the first linear shaft 292 is connected to the axial inner wall of the first guide seat 293 through the first bearing portion 295 and the first spacer portion 296, which can further improve the stability and reliability of the movement of the first linear shaft 292.

[0095] In a specific embodiment, Figure 3 As shown, the first bearing portion 295 includes a plurality of first bearings 2951 , and the first spacer portion 296 is disposed between two adjacent first bearings 2951 , which can further improve the stability and reliability of the movement of the first linear shaft 292 .

[0096] In a specific embodiment, Figure 2 , Figure 3 As shown, the first position detection unit 25 includes a position sensor with high measurement accuracy, simple structure and easy use.

[0097] In a specific embodiment, Figure 2 , Figure 3 As shown, the first displacement detection unit 26 includes a displacement sensor, which has high measurement accuracy, simple structure, and is easy to use.

[0098] In a specific embodiment, Figure 2 , Figure 3 As shown, the first detection head 27 includes a spherical detection head, which has a simple structure, is easy to use, and can improve measurement accuracy.

[0099] In a specific embodiment, Figure 2 , Figure 3 As shown, the first telescopic part 23 and the second telescopic part 24 both include a slide cylinder, which can improve the stability and reliability of the operation of the extended end of the first telescopic part 23 and the extended end of the second telescopic part 24.

[0100] In a specific embodiment, Figure 2 , Figure 3As shown, the rotatable plate 221 is connected to the top of the first clamp 222 via the guide key 224, so that the rotatable plate 221 can drive the first clamp 222 to rotate.

[0101] In a specific embodiment, Figure 2 , Figure 3 As shown, the extended end of the first retractable portion 23 is used to push the rotatable clamp portion 22 to rotate by contacting the bottom of the first clamp 222 when moving in the direction close to the rotatable clamp portion 22, which can facilitate the rotatable clamp portion 22 to rotate to a vertical arrangement state, which is simple and efficient.

[0102] In a specific embodiment, Figure 3 As shown, the second telescopic portion 24 is connected to the first bracket portion 20 via the first pad 5, which can facilitate adjustment of the position of the second telescopic portion 24 so that the second telescopic portion 24 is in a vertical arrangement state.

[0103] In a specific embodiment, Figure 3 As shown, a first rib plate 6 is provided on the side of the first bracket portion 20 facing away from the first pad 5 , and the bottom of the first rib plate 6 is fixedly connected to the first support portion 21 , which can improve the stability and reliability of the first measuring device.

[0104] In a specific embodiment, Figure 2 , Figure 3 As shown, the first bracket portion 20 includes a first vertically arranged vertical plate, which has a simple structure, is easy to use, and has good stability and reliability.

[0105] In a specific embodiment, Figure 3 As shown, the first supporting portion 21 includes a first bottom plate arranged horizontally, which has a simple structure, is easy to use, and has good stability and reliability.

[0106] In a specific embodiment, Figures 4 to 6 As shown, the second measuring device 3 includes: a second bracket portion 30, a second lower mechanism, a second upper mechanism and a controller.

[0107] The second lower mechanism is disposed at the lower part of the second bracket part 30. The second lower mechanism includes a second support part 31 and a support block 32 disposed in the second support part 31. A boss 321 for placing and supporting the sealing part 14 is disposed on the top of the support block 32. The second end surface 142 of the sealing part 14 contacts the top surface of the boss 321.

[0108] The second upper mechanism is disposed on the upper portion of the second bracket portion 30 and is located above the support block 32. The second upper mechanism includes a third retractable portion 33, a second position detection portion 34, a second displacement detection portion 35 and a second detection head portion 36.

[0109] The third telescopic portion 33 is connected to the second bracket portion 30. The extended end of the third telescopic portion 33 is connected to the second displacement detection portion 35 and the second detection head portion 36 and is used for reciprocating up and down.

[0110] The second position detection portion 34 is disposed on the third retractable portion 33 and is used to detect the position of the sealing portion 14 located on the support block 32 .

[0111] The third retractable portion 33 , the second displacement detecting portion 35 and the second detecting head portion 36 are all arranged vertically.

[0112] The first end of the second detection head 36 is connected to the second displacement detection part 35 via the second connection part 37. The second end of the second detection head 36 is used to contact the groove surface 143 of the sealing part 14.

[0113] The second displacement detection unit 35 is used to measure the sealing height value of the sealing portion 14 through the relative displacement of the second detection head 36 .

[0114] The third retractable portion 33 , the second position detecting portion 34 , and the second displacement detecting portion 35 are all electrically connected to the controller.

[0115] When in use, when the sealing part 14 is placed on the boss 321, and the second end surface 142 of the sealing part 14 contacts the top surface of the boss 321, the second position detection part 34 performs position sensing and sends the position information of the sealing part 14 on the boss 321 to the controller, and the controller controls the operation of the extended end of the third telescopic part 33, thereby driving the second displacement detection part 35 and the second detection head 36 to move downward to the target position for contact measurement. Before the contact measurement, the second end of the second detection head 36 is first contacted with the top surface of the boss 321 to be zeroed. When the contact measurement is performed, the second end of the second detection head 36 contacts the groove surface 143 of the sealing part 14, and the second detection head 36 moves upward, thereby driving the second displacement detection part 35 to move upward, and the relative displacement value of the second detection head 36 is measured according to the displacement signal of the second displacement detection part 35, thereby obtaining the sealing height value of the sealing part 14, and the sealing height value is stored in the controller. The process is simple and efficient, with high automation and intelligence, high accuracy and good reliability.

[0116] In a specific embodiment, Figures 4 to 6 As shown, the second connecting portion 37 includes: a second clamping block 371 , a second linear shaft 372 , a second guide seat 373 and a second mounting head 374 .

[0117] The second clamping block 371 , the second linear shaft 372 , the second guide seat 373 and the second mounting head 374 are all arranged vertically.

[0118] The second clamping block 371 is sleeved on the outside of the lower part of the second displacement detecting part 35 and is used to fix the second displacement detecting part 35. The bottom of the second clamping block 371 is fixedly connected to the top of the second guide seat 373.

[0119] The second linear shaft 372 is slidably disposed in the second guide seat 373. The first end of the second linear shaft 372 contacts the detection head of the second displacement detection unit 35. The second end of the second linear shaft 372 is connected to the first end of the second detection head 36 through the second mounting head 374.

[0120] The second guide seat 373 is fixedly connected to the third telescopic portion 33 .

[0121] When in use, the second clamping block 371 can be used to fix the second displacement detection unit 35 and improve the stability and reliability of the movement of the second displacement detection unit 35. The second linear shaft 372 can be used to extend the measuring length of the second detection head 36. The sliding cooperation between the second linear shaft 372 and the second guide seat 373 can improve the flexibility, stability and reliability of the operation of the second linear shaft 372. When performing contact measurement, the second detection head 36 moves upward through the second linear shaft 372, thereby driving the detection head of the second displacement detection unit 35 to move upward, which has good stability and reliability, and can improve the accuracy of the detection of the second displacement detection unit 35.

[0122] In a specific embodiment, Figures 4 to 6 As shown, the second measuring device further includes a second outer sleeve 38. The first end of the second outer sleeve 38 is fixedly connected to the bottom of the second guide seat 373, and the second end of the second outer sleeve 38 is used to be sleeved on the outside of the second mounting head 374 and / or the second detection head 36 to play a protective role.

[0123] In a specific embodiment, Figure 6 As shown, the axial outer wall of the second linear shaft 372 is connected to the axial inner wall of the second guide seat 373 through the second bearing portion 375 and the second spacer portion 376, which can further improve the stability and reliability of the movement of the second linear shaft 372.

[0124] In a specific embodiment, Figure 6 As shown, the second bearing portion 375 includes a plurality of second bearings 3751 , and the second spacer portion 376 is disposed between two adjacent second bearings 3751 , which can further improve the stability and reliability of the movement of the second linear shaft 372 .

[0125] In a specific embodiment, two spaced support ribs 311 are provided on the support portion 31 near the top of the support block 32, and the two opposite side surfaces 3111 of the two support ribs 311 are both arc-shaped surfaces. A cylindrical space is formed between the two opposite side surfaces 3111 for placing the sealing portion 14. The boss 321 is arranged in the cylindrical space. When in use, the cylindrical space formed between the two opposite side surfaces 3111 of the two support ribs 311 can facilitate the placement of the sealing portion 14 on the boss 321, and facilitate the alignment of the sealing portion 14 with the second detection head 36.

[0126] In a specific embodiment, Figures 4 to 6 As shown, the second position detection unit 34 includes a position sensor with high measurement accuracy, simple structure and easy use.

[0127] In a specific embodiment, Figures 4 to 6 As shown, the second displacement detection unit 35 includes a displacement sensor, which has high measurement accuracy, simple structure, and is easy to use.

[0128] In a specific embodiment, Figures 4 to 6 As shown, the second detection head 36 includes a spherical detection head, which has a simple structure, is easy to use, and can improve measurement accuracy.

[0129] In a specific embodiment, Figures 4 to 6 As shown, the third telescopic portion 33 includes a slide cylinder, which can improve the stability and reliability of the operation of the extended end of the third telescopic portion 33.

[0130] In a specific embodiment, the third retractable portion 33 is connected to the second bracket portion 30 via a second pad, which can facilitate adjustment of the position of the third retractable portion 33 so that the third retractable portion 33 is in a vertical arrangement state.

[0131] In a specific embodiment, Figure 4 , Figure 6 As shown, a second rib plate 7 is provided on the side of the second bracket portion 30 facing away from the second pad, and the bottom of the second rib plate 7 is fixedly connected to the second support portion 31, which can improve the stability and reliability of the first measuring device.

[0132] In a specific embodiment, Figures 4 to 6 As shown, the second bracket portion 30 includes a second vertically arranged vertical plate, which has a simple structure, is easy to use, and has good stability and reliability.

[0133] In a specific embodiment, Figures 4 to 6 As shown, the second supporting portion 31 includes a second bottom plate arranged horizontally, which has a simple structure, is easy to use, and has good stability and reliability.

[0134] In a specific embodiment, Figures 7 to 9 As shown, the pop-up device 4 includes: a plurality of fourth retractable parts 41, a plurality of guide rails 42, a third support part 43, a third bracket part 44, a plurality of material holding parts 45 and a controller.

[0135] The plurality of fourth retractable parts 41 are all electrically connected to the controller. The extended end of each fourth retractable part 41 is fixedly connected to the first end of a guide rail 42 and is used to drive the guide rail 42 to reciprocate forward and backward.

[0136] A plurality of slideways 431 are disposed along the left-right direction on the third support portion 43. Each slideway 431 passes through the front and rear end surfaces of the third support portion 43. The second end of each guide rail 42 can be slidably disposed in one slideway 431.

[0137] The bottom of the third bracket part 44 is fixedly connected to the top of the third support part 43. A plurality of material receiving parts 45 are arranged on the third bracket part 44 along the left-right direction. Each material receiving part 45 is vertically arranged in the third bracket part 44 and correspondingly arranged above a slideway 431.

[0138] The plurality of material receiving parts 45 are used to place a plurality of gasket groups of different thicknesses. Each material receiving part 45 is used to place a gasket group of the same thickness. The bottom of each material receiving part 45 is provided with an opening 451 for the gaskets in the gasket group to fall into the corresponding slide 431. The target gasket 13 falling into the slide 431 is pushed out of the slide 431 when the second end of the corresponding guide rail 42 moves forward.

[0139] During use, since the body 11, the needle valve 12 and the sealing part 14 may fluctuate, in order to obtain a gap setting value as close as possible to the target, it is necessary to select a suitable target gasket 13 based on the relative height value of the body 11 and the needle valve 12 and the sealing height value of the sealing part 14. Based on the tolerance requirements of the gasket, multiple (for example, 10) gasket groups of different thicknesses are designed, and the sizes increase in sequence. The controller can quickly and accurately calculate the thickness value of the target gasket 13 based on the input assembly relationship formula of the injector 1, the gap setting value of the injector 1, and the stored relative height value of the body 11 and the needle valve 12 and the sealing height value of the sealing part 14. When the thickness value of the gasket group in a certain material holding part 45 of the multiple material holding parts 45 is the same as the thickness value of the target gasket 13, the controller makes a judgment and sends information to the corresponding fourth telescopic part 41, controls the extended end of the fourth telescopic part 41 to drive the corresponding guide rail 42 to move, and pushes out a gasket in the corresponding material holding part 45, thereby obtaining the target gasket 13.

[0140] In a specific embodiment, Figure 7 , Fig. 9As shown, the pop-up device includes a baffle portion 46 arranged on the front side of the third support portion 43. The target gasket 13 is pushed out of the slide 431 by the second end of the guide rail 42 and enters the baffle portion 46, so that the target gasket 13 can fall into the baffle portion 46 in an orderly manner and prevent the target gasket 13 from falling outside the target position.

[0141] In a specific embodiment, Figures 7 to 9 As shown, the pop-up device further includes a support platform 47. The fourth retractable portion 41, the third support portion 43 and the baffle portion 46 are all arranged on the support platform 47, which can make the pop-up device well-arranged and easy to use.

[0142] In a specific embodiment, Figures 7 to 9 As shown, the support platform 47 includes: a vertically arranged support plate 471 and a horizontally arranged third bottom plate 472. The top of the support plate 471 is fixedly connected to the bottom of the third bottom plate 472, which has good stability and reliability, and is simple in structure and easy to use.

[0143] In a specific embodiment, Figures 7 to 9 As shown, there are multiple support plates 471 , and the multiple support plates 471 are arranged at intervals, which can improve the stability and reliability of the support platform 47 .

[0144] In a specific embodiment, Figure 7 , Fig. 9 As shown, each fourth telescopic portion 41 is connected to the third bottom plate 472 via a mounting plate 48, and has good stability and reliability.

[0145] In a specific embodiment, Figure 7 , Fig. 9 As shown, the fourth telescopic portion 41 includes a slide cylinder, which can improve the stability and reliability of the operation of the extended end of the fourth telescopic portion 41.

[0146] In a specific embodiment, Figures 7 to 9 As shown, the material holding portion 45 includes a material barrel, which has a simple structure and is easy to use.

[0147] In a specific embodiment, Figures 7 to 9 As shown, the third support portion 43 includes a support plate, which has a simple structure and is easy to use.

[0148] In a specific embodiment, the controller includes: at least one processor; and a memory connected to the processor. The memory stores a calculation value program instruction that can be executed by the processor, and when the instruction is executed by the processor, the processor performs a corresponding operation to drive the extended end of the first retractable part 23, the extended end of the second retractable part 24, the third retractable part 33 and / or the extended end of the fourth retractable part 41 to move.

[0149] When the gasket selection device of the present invention is used, the first measuring device 2 is used to measure the relative height value between the end face of the body 11 and the end face of the needle valve 12, the second measuring device 3 is used to measure the sealing height value of the sealing portion 14, and the pop-up device 4 is used to automatically calculate the thickness value of the target gasket 13 and automatically pop up the target gasket 13 according to the assembly relationship of the injector 1, the clearance setting value of the injector 1, the relative height value between the end face of the body 11 and the end face of the needle valve 12, and the sealing height value of the sealing portion 14. The gasket selection process is simple and efficient, with a high degree of automation, a high degree of intelligence, high accuracy, and good reliability.

[0150] Based on the above embodiments, Figures 1 to 10 As shown, the present invention proposes a fuel injector pad selection method, which is applied to the above-mentioned pad selection device.

[0151] The fuel injector 1 includes a body 11 , a needle valve 12 , a target gasket 13 and a sealing portion 14 .

[0152] The body 11 is sleeved on the outside of the needle valve 12. The end surface of the body 11 extends outward from the end surface of the needle valve 12. The end surface of the body 11 contacts the first end surface of the gasket. The sealing portion 14 is placed inside the target gasket 13. The first end surface 141 of the sealing portion 14 contacts the position of the needle valve 12 close to the end surface of the needle valve 12. The second end surface 142 of the sealing portion 14 is flush with the second end surface of the target gasket 13.

[0153] The pad selection method includes the following steps:

[0154] Determine the assembly relationship of injector 1.

[0155] The relative height values ​​of the end surface of the body 11 and the end surface of the needle valve 12 are measured by the first measuring device 2 .

[0156] The sealing height value of the sealing portion 14 is measured by the second measuring device 3 .

[0157] The target gasket 13 is ejected by the ejection device 4 according to the assembly relationship of the injector 1, the clearance setting value of the injector 1, the relative height value between the end surface of the body 11 and the end surface of the needle valve 12, and the sealing height value of the sealing portion 14.

[0158] When in use, the assembly relationship of the injector 1 is determined. The relative height value between the end face of the body 11 and the end face of the needle valve 12 is measured by the first measuring device 2, and the sealing height value of the sealing portion 14 is measured by the second measuring device 3. The pop-up device 4 can automatically calculate the thickness value of the target gasket 13 and automatically pop out the target gasket 13 according to the assembly relationship of the injector 1, the clearance setting value of the injector 1, the relative height value between the end face of the body 11 and the end face of the needle valve 12, and the sealing height value of the sealing portion 14, with a high degree of automation and intelligence, a simple and efficient gasket selection process, high accuracy, and good reliability.

[0159] In a specific embodiment, Figure 1 As shown, the assembly relationship of the injector 1 includes that the sum of the relative height value between the end face of the body 11 and the end face of the needle valve 12 and the thickness value of the target gasket 13 is equal to the sum of the gap setting value of the injector 1 and the sealing height value of the sealing portion 14. Specifically, the gap setting value of the injector 1 is defined as Plunger Stroke, the relative height value between the end face of the body 11 and the end face of the needle valve 12 is defined as M1, the thickness value of the target gasket 13 is defined as M2, and the sealing height value of the sealing portion 14 is defined as M3. According to the conversion relationship of "Plunger Stroke = M1 + M2-M3", M2 = Plungerstroke + M3-M1 is obtained. Since the gap setting value of the same type of injector 1 is a fixed value, the thickness value of the target gasket 13 can be quickly obtained according to the measured relative height value between the end face of the body 11 and the end face of the needle valve 12 and the sealing height value of the sealing portion 14.

[0160] In a specific embodiment, the clearance setting value of the fuel injector 1 is 0.167-0.169 mm. Preferably, the clearance setting value of the fuel injector 1 is 0.168 mm.

[0161] The pad selection method of the present invention is simple, efficient, accurate and reliable. In addition, the pad selection method of the present invention has a high degree of automation, can save manpower and material resources, has good economy and safety.

[0162] The protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope and spirit of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these changes and modifications.

Claims

1. A fuel injector pad selection device, characterized in that: include: A fuel injector (1), a first measuring device (2), a second measuring device (3) and an ejection device (4); The fuel injector (1) comprises a body (11), a needle valve (12), a target gasket (13) and a sealing portion (14); The body (11) is sleeved on the outside of the needle valve (12); the end surface of the body (11) extends outward from the end surface of the needle valve (12); the end surface of the body (11) contacts the first end surface of the target gasket (13); the sealing portion (14) is placed inside the target gasket (13); the first end surface (141) of the sealing portion (14) contacts a position on the needle valve (12) close to the end surface of the needle valve (12), and the second end surface (142) of the sealing portion (14) is flush with the second end surface of the target gasket (13); The first measuring device (2) is used to measure the relative height value between the end surface of the body (11) and the end surface of the needle valve (12); The second measuring device (3) is used to measure the sealing height value of the sealing portion (14); The ejection device (4) is used to eject the target gasket (13) according to the assembly relationship of the injector (1), the clearance setting value of the injector (1), the relative height value between the end surface of the body (11) and the end surface of the needle valve (12), and the sealing height value of the sealing portion (14).

2. The fuel injector selection device according to claim 1, characterized in that: The assembly relationship of the injector (1) includes that the sum of the relative height value between the end face of the body (11) and the end face of the needle valve (12) and the thickness value of the target gasket (13) is equal to the sum of the clearance setting value of the injector (1) and the sealing height value of the sealing portion (14).

3. The fuel injector selection device according to claim 1, characterized in that: The clearance setting value of the injectors (1) of the same model is a fixed value.

4. The fuel injector pad selection device according to claim 1, characterized in that: The first measuring device (2) comprises: a first bracket portion (20), a first lower mechanism, a first upper mechanism and a controller; The first lower mechanism is arranged at the lower part of the first bracket part (20); the first lower mechanism comprises a first supporting part (21), a rotatable clamp part (22) and a first retractable part (23); The first supporting portion (21) is fixedly connected to the first bracket portion (20); The rotatable clamping part (22) is rotatably connected to the first supporting part (21); the rotatable clamping part (22) is used to place and clamp the body (11) and the needle valve (12); The first telescopic portion (23) is arranged below the first supporting portion (21) and is fixedly connected to the first bracket portion (20); the extended end of the first telescopic portion (23) is used to move back and forth and push the rotatable clamp portion (22) to rotate when moving in a direction close to the rotatable clamp portion (22), so that the rotatable clamp portion (22) and the body (11) and the needle valve (12) in the rotatable clamp portion (22) are all arranged vertically; The first upper mechanism is arranged on the upper part of the first bracket part (20) and is located above the rotatable clamp part (22); the first upper mechanism comprises a second telescopic part (24), a first position detection part (25), a first displacement detection part (26), a first detection head part (27) and a first outer sleeve part (28); The second telescopic portion (24) is fixedly connected to the first bracket portion (20); the extended end of the second telescopic portion (24) is fixedly connected to the first displacement detection portion (26), the first detection head portion (27) and the first outer sleeve portion (28) and is used for reciprocating up and down movement; The first position detection portion (25) is disposed on the second telescopic portion (24) and is used to detect the positions of the body (11) and the needle valve (12) located in the rotatable clamp portion (22); The second telescopic portion (24), the first displacement detection portion (26), the first detection head portion (27) and the first outer sleeve portion (28) are all arranged vertically; The first detection head (27) and the first outer sleeve (28) are both connected to the first displacement detection portion (26) via a first connection portion (29); The first end surface of the first detection head (27) is used to contact the end surface of the needle valve (12); The first outer sleeve (28) is sleeved on the outside of the first detection head (27); the first end surface of the first outer sleeve (28) is used to contact the end surface of the body (11); The first displacement detection portion (26) is used to measure the relative height value between the end surface of the body (11) and the end surface of the needle valve (12) through the relative displacement value of the first detection head (27); The first retractable portion (23), the second retractable portion (24), the first position detection portion (25) and the first displacement detection portion (26) are all electrically connected to the controller.

5. The fuel injector pad selection device according to claim 4, characterized in that: The rotatable clamp part (22) comprises: a rotatable plate (221), a first clamp (222) and a second clamp (223); The rotatable plate (221) is rotatably connected to the first supporting portion (21); The first clamp (222) is fixedly connected to the rotatable plate (221); a first accommodating cavity is provided inside the first clamp (222); The second clamp (223) is movably disposed in the first accommodating cavity and is used to clamp the body (11) and the needle valve (12) located in the second clamp (223).

6. The fuel injector pad selection device according to claim 4, characterized in that: The first connecting portion (29) comprises: a first clamping block (291), a first linear axis (292), a first guide seat (293) and a first mounting head (294); The first clamping block (291), the first linear axis (292), the first guide seat (293) and the first mounting head (294) are all arranged vertically; The first clamping block (291) is sleeved on the outside of the lower part of the first displacement detecting part (26) and is used to fix the first displacement detecting part (26); the bottom of the first clamping block (291) is fixedly connected to the top of the first guide seat (293); The first linear shaft (292) is slidably disposed in the first guide seat (293); a first end of the first linear shaft (292) contacts the detection head of the first displacement detection unit (26), and a second end of the first linear shaft (292) is connected to a second end of the first detection head (27) via the first mounting head (294); The first guide seat (293) is fixedly connected to the second telescopic portion (24); The second end of the first outer sleeve (28) is fixedly connected to the first guide seat (293).

7. The fuel injector pad selection device according to claim 6, characterized in that: The axial outer wall of the first linear shaft (292) is connected to the axial inner wall of the first guide seat (293) through a first bearing portion (295) and a first spacer portion (296).

8. The fuel injector pad selection device according to claim 7, characterized in that: The first bearing portion (295) includes a plurality of first bearings (2951), and the first spacer portion (296) is disposed between two adjacent first bearings (2951).

9. The fuel injector pad selection device according to claim 4, characterized in that: The first position detection unit (25) includes a position sensor, the first displacement detection unit (26) includes a displacement sensor, and the first detection head (27) includes a spherical detection head.

10. The fuel injector pad selection device according to claim 4, characterized in that: The first telescopic part (23) and the second telescopic part (24) both include a slide cylinder.

11. The fuel injector pad selection device according to claim 5, characterized in that: The rotatable plate (221) is connected to the top of the first clamp (222) via a guide key (224).

12. The fuel injector pad selection device according to claim 5, characterized in that: The extended end of the first retractable portion (23) is used to push the rotatable clamp portion (22) to rotate by contacting the bottom of the first clamp (222) when moving in a direction close to the rotatable clamp portion (22).

13. The fuel injector pad selection device according to claim 4, characterized in that: The second telescopic portion (24) is connected to the first bracket portion (20) via a first pad (5).

14. The fuel injector pad selection device according to claim 13, characterized in that: A first rib plate (6) is provided on a side (5) of the first bracket portion (20) facing away from the first pad, and the bottom of the first rib plate (6) is fixedly connected to the first support portion (21).

15. The fuel injector pad selection device according to claim 4, characterized in that: The first bracket portion (20) comprises a first vertical plate arranged vertically, and the first support portion (21) comprises a first bottom plate arranged horizontally.

16. The fuel injector pad selection device according to claim 4, characterized in that: The second measuring device (3) comprises: a second bracket portion (30), a second lower mechanism, a second upper mechanism and the controller; The second lower mechanism is arranged at the lower part of the second bracket part (30); the second lower mechanism comprises a second supporting part (31) and a supporting block (32) arranged in the second supporting part (31); a boss (321) for placing and supporting the sealing part (14) is arranged on the top of the supporting block (32); the second end surface (142) of the sealing part (14) is in contact with the top surface of the boss (321); The second upper mechanism is arranged on the upper part of the second bracket part (30) and is located above the support block (32); the second upper mechanism comprises a third retractable part (33), a second position detection part (34), a second displacement detection part (35) and a second detection head (36); The third telescopic portion (33) is fixedly connected to the second bracket portion (30); the extended end of the third telescopic portion (33) is fixedly connected to the second displacement detection portion (35) and the second detection head portion (36) and is used for reciprocating up and down movement; The second position detection portion (34) is arranged on the third retractable portion (33) and is used to detect the position of the sealing portion (14) located on the boss (321); The third retractable portion (33), the second displacement detection portion (35) and the second detection head (36) are all arranged vertically; The first end of the second detection head (36) is connected to the second displacement detection part (35) via a second connection part (37); the second end of the second detection head (36) is used to contact the groove surface (143) of the sealing part (14); The second displacement detection portion (35) is used to measure the sealing height value of the sealing portion (14) through the relative displacement value of the second detection head (36); The third retractable portion (33), the second position detection portion (34) and the second displacement detection portion (35) are all electrically connected to the controller.

17. The fuel injector pad selection device according to claim 16, characterized in that: The second connecting portion (37) comprises: a second clamping block (371), a second linear axis (372), a second guide seat (373) and a second mounting head (374); The second clamping block (371), the second linear axis (372), the second guide seat (373) and the second mounting head (374) are all arranged vertically; The second clamping block (371) is sleeved on the outside of the lower part of the second displacement detecting part (35) and is used to fix the second displacement detecting part (35); the bottom of the second clamping block (371) is fixedly connected to the top of the second guide seat (373); The second linear shaft (372) is slidably disposed in the second guide seat (373); the first end of the second linear shaft (372) contacts the detection head of the second displacement detection unit (35), and the second end of the second linear shaft (372) is connected to the first end of the second detection head (36) via the second mounting head (374); The second guide seat (373) is fixedly connected to the third telescopic portion (33).

18. The fuel injector pad selection device according to claim 17, characterized in that: The second measuring device (3) further comprises a second outer sleeve (38), a first end of the second outer sleeve (38) being fixedly connected to the bottom of the second guide seat (373), and a second end of the second outer sleeve (38) being used for being sleeved on the outside of the second mounting head (374) and / or the second detection head (36).

19. The fuel injector pad selection device according to claim 17, characterized in that: The axial outer wall of the second linear shaft (372) is connected to the axial inner wall of the second guide seat (373) through a second bearing portion (375) and a second spacer portion (376).

20. The fuel injector pad selection device according to claim 19, characterized in that: The second bearing portion (375) includes a plurality of second bearings (3751), and the second spacer portion (376) is disposed between two adjacent second bearings (3751).

21. The fuel injector pad selection device according to claim 16, characterized in that: Two spaced apart support ribs (311) are provided on the support portion (31) near the top of the support block (32); two opposite side surfaces (3111) of the two support ribs (311) are both arc-shaped surfaces; a cylindrical space is formed between the two opposite side surfaces (3111) for accommodating the sealing portion (14); and the boss (321) is arranged in the cylindrical space.

22. The fuel injector pad selection device according to claim 16, characterized in that: The second position detection unit (34) includes a position sensor, the second displacement detection unit (35) includes a displacement sensor, and the second detection head includes a spherical detection head.

23. The fuel injector pad selection device according to claim 16, characterized in that: The third telescopic part (33) comprises a slide cylinder.

24. The fuel injector pad selection device according to claim 16, characterized in that: The third telescopic portion (33) is connected to the second bracket portion (30) via a second pad.

25. The fuel injector pad selection device according to claim 24, characterized in that: A second rib plate (7) is provided on the side of the second bracket portion (30) facing away from the second pad, and the bottom of the second rib plate (7) is fixedly connected to the second support portion (31).

26. The fuel injector pad selection device according to claim 16, characterized in that: The second bracket portion (30) comprises a second vertical plate arranged vertically, and the second support portion (31) comprises a second bottom plate arranged horizontally.

27. The fuel injector pad selection device according to claim 16, characterized in that: The ejection device (4) comprises: a plurality of fourth retractable parts (41), a plurality of guide rails (42), a third support part (43), a third bracket part (44), a plurality of material holding parts (45) and the controller; The plurality of fourth retractable parts (41) are electrically connected to the controller; the extended end of each of the fourth retractable parts (41) is fixedly connected to the first end of a guide rail (42) and is used to drive the guide rail (42) to reciprocate forward and backward; A plurality of slideways (431) are arranged on the third support portion (43) along the left-right direction; each of the slideways (431) passes through the front and rear end surfaces of the third support portion (43); and the second end of each of the guide rails (42) can be slidably arranged in one of the slideways (431); The bottom of the third bracket part (44) is fixedly connected to the top of the third support part (43); a plurality of the material holding parts (45) are arranged on the third bracket part (44) along the left-right direction; each of the material holding parts (45) is vertically arranged in the third bracket part (44) and correspondingly arranged above one of the slideways (431); The plurality of material receiving sections (45) are used to place a plurality of gasket groups of different thicknesses; each of the material receiving sections (45) is used to place a gasket group of the same thickness; an opening (451) is provided at the bottom of each of the material receiving sections (45) for allowing the gaskets in the gasket group to fall into the corresponding slideway (431); the target gasket (13) that falls into the slideway (431) is pushed out of the slideway (431) when the second end of the corresponding guide rail (42) moves forward.

28. The fuel injector pad selection device according to claim 27, characterized in that: The ejection device (4) comprises a baffle portion (46) arranged on the front side of the third support portion (43), and the target pad (13) is pushed out of the slideway (431) from the second end of the guide rail (42) and enters the baffle portion (46).

29. The fuel injector pad selection device according to claim 28, characterized in that: The pop-up device (4) further comprises a supporting platform (47), and the fourth telescopic portion (41), the third supporting portion (43) and the baffle portion (46) are all arranged on the supporting platform (47).

30. The fuel injector pad selection device according to claim 29, characterized in that: The support platform (47) comprises: a vertically arranged support plate (471) and a horizontally arranged third bottom plate (472), and the top of the support plate (471) is fixedly connected to the bottom of the third bottom plate (472).

31. The fuel injector pad selection device according to claim 30, characterized in that: The number of the support plates (471) is multiple, and the multiple support plates (471) are arranged at intervals.

32. The fuel injector pad selection device according to claim 30, characterized in that: Each of the fourth telescopic parts (41) is connected to the third bottom plate (472) via a mounting plate (48).

33. The fuel injector pad selection device according to claim 27, characterized in that: The fourth telescopic portion (41) comprises a slide cylinder, the material containing portion (45) comprises a material barrel, and the third supporting portion (43) comprises a supporting plate.

34. The fuel injector pad selection device according to claim 27, characterized in that: The controller includes: at least one processor; and a memory connected to the processor; wherein the memory stores calculation value program instructions that can be executed by the processor, and when the instructions are executed by the processor, the processor performs corresponding operations to drive the extension end of the first retractable part, the extension end of the second retractable part, the extension end of the third retractable part and / or the extension end of the fourth retractable part to move.

35. A method for selecting a fuel injector pad, applied to the pad selection device according to any one of claims 1 to 34; characterized in that: The fuel injector (1) comprises a body (11), a needle valve (12), a target gasket (13) and a sealing portion (14); The body (11) is sleeved on the outside of the needle valve (12); the end surface of the body (11) extends outward from the end surface of the needle valve (12); the end surface of the body (11) contacts the first end surface of the target gasket (13); the sealing portion (14) is placed inside the target gasket (13); the first end surface of the sealing portion (14) contacts a position on the needle valve (12) close to the end surface of the needle valve (12), and the second end surface of the sealing portion (14) is flush with the second end surface of the target gasket (13); The method comprises the following steps: Determining the assembly relationship of the fuel injector (1); Using a first measuring device (2) to measure the relative height value between the end surface of the body (11) and the end surface of the needle valve (12); Using a second measuring device (3) to measure the sealing height value of the sealing portion (14); The target gasket (13) is ejected using an ejection device (4) according to the assembly relationship of the injector (1), the clearance setting value of the injector (1), the relative height value between the end surface of the body (11) and the end surface of the needle valve (12), and the sealing height value of the sealing portion (14).

36. The method for selecting a gasket for a fuel injector according to claim 35, characterized in that: The assembly relationship of the injector (1) includes that the sum of the relative height value between the end face of the body (11) and the end face of the needle valve (12) and the thickness value of the target gasket (13) is equal to the sum of the clearance setting value of the injector (1) and the sealing height value of the sealing portion (14).

37. The method for selecting a gasket for a fuel injector according to claim 35, characterized in that: The clearance setting value of the fuel injectors (1) of the same model is a fixed value.

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