Needle valve length detection device

Abstract

The invention relates to a needle valve length detection device which comprises a base, a needle valve conical surface positioning mechanism installed on the base, a V-shaped positioning mechanism installed on the base, a sliding rod adjusting mechanism arranged on the side face of the base and used for abutting against a needle valve, and a measuring mechanism arranged on the base. The needle valve conical surface positioning mechanism comprises a conical surface positioning seat, and a left rocker arm assembly and a right rocker arm assembly which are rotatably and adjustably mounted on the conical surface positioning seat; the needle valve is installed on the V-shaped positioning mechanism and abuts against the position between the left rocker arm assembly and the right rocker arm assembly through the sliding rod adjusting mechanism, and the length of the needle valve is detected through the measuring mechanism. According to the needle valve length detection device of the technical scheme, after the needle valve is installed on the V-shaped positioning mechanism, the needle valve is pushed by the sliding rod adjusting mechanism to abut against the needle valve conical surface positioning mechanism for detection, the length of the to-be-detected piece is rapidly detected through the measuring mechanism, the whole operation detection process is simple and rapid, and the product detection efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of marine needle valves, and more specifically to a needle valve length detection device. Background Technology

[0002] The fuel injection needle valve is a core component of the internal combustion engine's fuel injection system, and its performance directly affects the engine's combustion efficiency, power output, and emissions levels.

[0003] After the needle valve is precision machined, a conical structure is formed at the front end. The length of the conical surface cannot be accurately measured using ordinary measuring tools. A universal tool microscope is required to measure the angle of the conical surface, determine the opening size of the conical surface, and then measure the length from the conical surface to the end face. This method is time-consuming, and the operator must be able to operate the universal tool microscope, which requires high skills. The current inspection method is time-consuming, wastes a lot of time on inspection, and affects production efficiency.

[0004] Therefore, in order to solve the above problems, a needle valve length detection device is needed to solve the aforementioned technical issues. Summary of the Invention

[0005] The needle valve length detection device of this technical solution is implemented by installing the needle valve on the V-shaped positioning mechanism, and then pushing the needle valve against the needle valve cone surface positioning mechanism through the slide bar adjustment mechanism for detection. The length of the workpiece is quickly detected by the measuring mechanism. The entire operation and detection process is simple and fast, which greatly improves the product detection efficiency.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] A needle valve length detection device includes a base, a needle valve conical surface positioning mechanism mounted on the base, a V-shaped positioning mechanism mounted on the base, a slide bar adjustment mechanism disposed on the side of the base for pressing against the needle valve, and a measuring mechanism disposed on the base. The needle valve conical surface positioning mechanism includes a conical surface positioning seat, a left rocker arm assembly and a right rocker arm assembly rotatably and adjustablely mounted on the conical surface positioning seat. The needle valve is mounted on the V-shaped positioning mechanism and pressed against the left rocker arm assembly and the right rocker arm assembly by the slide bar adjustment mechanism, and its length is detected by the measuring mechanism.

[0008] Furthermore, the right rocker arm assembly includes a right rocker arm that is rotatably and adjustablely mounted on a conical positioning seat and a right positioning post that is fixedly mounted in conjunction with the right rocker arm. The left rocker arm assembly includes a left rocker arm that is rotatably and adjustablely mounted on a conical positioning seat and a left positioning post that is fixedly mounted in conjunction with the left rocker arm. The needle valve conical surface is installed between the right positioning post and the left positioning post.

[0009] Furthermore, the left rocker arm assembly and the right rocker arm assembly have the same structure. The right rocker arm has an overall L-shaped structure. The front end of the right rocker arm has a rocker arm mounting platform that is fixedly installed with the right positioning post. The right rocker arm is provided with a positioning post locking hole that is fixedly installed with the right positioning post.

[0010] Furthermore, the right rocker arm is provided with a vertical positioning hole along the vertical direction to cooperate with the conical positioning seat for fixed installation, and both the right and left rocker arms are provided with rocker arm spacing adjustment holes to cooperate with the two for spacing adjustment.

[0011] Furthermore, a positioning boss is formed on the conical positioning seat, and a rocker arm push rod for pushing the right rocker arm assembly and the left rocker arm assembly to rotate and adjust is provided on the positioning boss.

[0012] Furthermore, the slide bar adjustment mechanism includes a slide bar mounting seat mounted on the base, a guide sleeve mounted in conjunction with the slide bar mounting seat, a slide bar assembly slidably mounted in the guide sleeve, and a measuring push rod assembly mounted in conjunction with the slide bar assembly; the measuring push rod assembly is mounted at the end of the slide bar assembly and is used to push the needle valve against the needle valve conical surface positioning mechanism.

[0013] Furthermore, the slide rod assembly includes a slide rod that is slidably and adjustablely installed in the guide sleeve, a limiting block installed in the guide sleeve for limiting the sliding of the slide rod, a measuring positioning post fixedly installed at the front end of the slide rod, and a return spring installed in the slide rod; the slide rod is a hollow tubular structure with an oblong groove, the limiting block passing through the oblong groove, and the return spring installed between the measuring positioning post and the limiting block.

[0014] Furthermore, the measuring push rod assembly includes a push rod fixedly installed at the end of the slide rod, a locking member that cooperates with the slide rod to fix and lock the slide rod, and a push handle provided at the end of the slide rod. The push handle forms a vertical pushing surface for pushing the needle valve to move axially and a receiving surface.

[0015] Furthermore, the V-shaped positioning mechanism includes a V-shaped positioning seat mounted on a base and a gantry fixedly mounted on the V-shaped positioning seat. A locking rod for locking the needle valve to the V-shaped positioning seat in the vertical direction is mounted on the gantry.

[0016] Furthermore, the measuring mechanism includes a measuring base mounted on a base and a measuring device, wherein the measuring base has a measuring base mounting hole for locking and mounting the measuring device.

[0017] The beneficial effects of this technical solution are:

[0018] The needle valve length detection device of this technical solution detects the length of the workpiece by installing the needle valve on the V-shaped positioning mechanism and pushing the needle valve against the needle valve cone surface positioning mechanism through the slide bar adjustment mechanism. The length of the workpiece is quickly detected by the measuring mechanism. The entire operation and detection process is simple and fast, which greatly improves the product detection efficiency.

[0019] Compared to using a traditional universal tool microscope for inspection, the testing device of this technical solution significantly reduces the skill requirements for the operator. When testing different models of needle valves, only the needle valve cone positioning mechanism needs to be adjusted to meet the requirements of different models, thus improving the versatility of the product. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is an isometric schematic diagram of the slide bar adjustment mechanism of the present invention;

[0022] Figure 3 This is a side view of the slide bar adjustment mechanism of the present invention;

[0023] Figure 4 For the present invention Figure 3 Schematic diagram of the CC section;

[0024] Figure 5 This is a schematic diagram of the installation of the measuring push rod assembly of the present invention;

[0025] Figure 6 This is a schematic diagram of the V-shaped positioning mechanism of the present invention;

[0026] Figure 7 This is an isometric schematic diagram of the needle valve conical surface positioning mechanism of the present invention;

[0027] Figure 8 This is a schematic diagram of the internal installation of the needle valve conical surface positioning mechanism of the present invention;

[0028] Figure 9 This is a schematic diagram of the installation of the positioning column of the present invention;

[0029] Figure 10 This is a schematic diagram of the needle valve of the present invention (L is the length to be detected).

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 1-Base; 2-Baffle; 3-V-type positioning mechanism; 4-Slide rod adjustment mechanism; 5-Measuring mechanism; 6-Needle valve conical positioning mechanism; 7-Needle valve; 31-Gantry; 32-V-type positioning seat; 33-V-type positioning seat opening; 34-Gantry opening; 41-Measuring positioning column; 42-Slide rod mounting seat; 43-Guide sleeve; 44-Locking component; 45-Push rod; 46-Slide rod; 47-Limit block; 48-Return spring; 431 - Guide sleeve wing plate; 451 - Vertical pushing surface; 452 - Receiving surface; 461 - Waist-shaped slot; 462 - Push rod part; 51 - Measuring seat mounting hole; 61 - Conical positioning seat; 62 - Right rocker arm; 63 - Right positioning post; 64 - Left positioning post; 65 - Left rocker arm; 66 - Vertical bolt; 67 - Rocker arm spacing adjustment hole; 68 - Positioning post locking hole; 69 - Rocker arm top rod; 621 - Rocker arm hole; 641 - Positioning post mounting hole. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] like Figure 1As shown in the embodiment of this application, a needle valve length detection device includes a base 1, a needle valve conical surface positioning mechanism 6 mounted on the base 1, a V-shaped positioning mechanism 3 mounted on the base 1, a slide bar adjustment mechanism 4 disposed on the side of the base 1 for pressing against the needle valve 7, and a measuring mechanism 5 disposed on the base 1. The needle valve conical surface positioning mechanism 6 includes a conical surface positioning seat 61, a left rocker arm assembly and a right rocker arm assembly rotatably and adjustablely mounted on the conical surface positioning seat 61. The needle valve 7 is mounted on the V-shaped positioning mechanism 3 and pressed against the left rocker arm assembly and the right rocker arm assembly by the slide bar adjustment mechanism 4, and its length is detected by the measuring mechanism 5. A baffle 2 is installed at the end of the base 1 to ensure that the various mechanisms do not slide out of the base 1 when the position is adjusted.

[0037] The needle valve length detection device of this technical solution, after the needle valve 7 is installed on the V-shaped positioning mechanism 3, pushes the needle valve 7 against the needle valve cone surface positioning mechanism 6 through the slide bar adjustment mechanism 4 for detection, and quickly detects the length of the part to be tested through the measuring mechanism 5. The whole operation and detection process is simple and fast, which greatly improves the product detection efficiency.

[0038] In this embodiment, as Figure 7-8 As shown, the right rocker arm assembly includes a right rocker arm 62 rotatably and adjustablely mounted on a conical positioning seat 61 and a right positioning post 63 fixedly mounted in conjunction with the right rocker arm 62. The left rocker arm assembly includes a left rocker arm 65 rotatably and adjustablely mounted on a conical positioning seat 61 and a left positioning post 64 fixedly mounted in conjunction with the left rocker arm 65. The needle valve 7 is conically mounted between the right positioning post 63 and the left positioning post 64.

[0039] The conical positioning seat 61 is fixedly installed on the base 1, providing an integrated installation point for the rocker arm assembly. The left and right rocker arm assemblies adopt the same structure, both of which include rocker arms and positioning posts for fixed installation with the rocker arms. After the right rocker arm 62 and the left rocker arm 65 are fixedly installed, the right positioning post 63 and the left positioning post 64 form a spacing for use with the conical surface of the needle valve 7. That is, the conical end of the needle valve 7 is installed between the two positioning posts, forming a positioning installation position.

[0040] In this embodiment, as Figure 7-8 As shown, the left rocker arm assembly and the right rocker arm assembly have the same structure. The right rocker arm 62 has an overall L-shaped structure. The front end of the right rocker arm 62 has a rocker arm mounting platform that is fixedly installed with the right positioning post 63. The right rocker arm 62 is provided with a positioning post locking hole 68 that is fixedly installed with the right positioning post 63.

[0041] The left and right rocker arms have the same structure. Taking the right rocker arm 62 as an example, the right rocker arm 62 has an overall L-shaped structure. Its front end is machined to form a rocker arm mounting platform for fixed installation with the positioning column. The right rocker arm 62 has a positioning column locking hole 68, and the corresponding right positioning column 63 has a corresponding positioning column mounting hole 641. The locking bolt is fixedly installed by the positioning column locking hole 68 with the right positioning column 63. After the right rocker arm 62 is rotated and adjusted to a suitable position by the conical positioning seat 61, it is locked to determine the installation position of the right positioning column 63.

[0042] In this embodiment, as Figure 7-9 As shown, the right rocker arm 62 has a vertical positioning hole for fixing the conical positioning seat 61 along the vertical direction. Both the right rocker arm 62 and the left rocker arm 65 have rocker arm spacing adjustment holes 67 for adjusting the spacing between them.

[0043] The right rocker arm 62 has a conical vertical positioning hole in the vertical direction (i.e., the direction of the installation height of the right rocker arm), which is fixedly installed on the conical positioning seat 61 with the vertical bolt 66. A rocker arm spacing adjustment hole 67 is provided on the side of the rocker arm. After the two rocker arms are adjusted to the appropriate position, the spacing is locked by bolts passing through the two rocker arm spacing adjustment holes 67 (the rocker arm spacing adjustment holes 67 can be set as oblong holes, the adjustment distance of the rocker arm rotation is small and does not affect the normal use of the product). In the vertical direction, the two rocker arms are pressed tightly onto the conical positioning seat 61 by a pressure plate and locked by the vertical bolt 66, thus ensuring stable installation. To further improve the detection accuracy, the two positioning pins can be replaced with... Figure 9 The aforementioned triangular prism structure, when used with a conical surface for installation, provides more precise positioning and improves product testing accuracy.

[0044] In this embodiment, a positioning boss is formed on the conical positioning seat 61, and a rocker arm push rod 69 for pushing the right rocker arm assembly and the left rocker arm assembly to rotate and adjust is provided on the positioning boss.

[0045] The positioning seat boss has a mounting hole for mounting the rocker arm push rod 69. The corresponding rocker arm push rod 69 can be slidably and adjustablely installed in the corresponding hole. The right rocker arm has a rocker arm hole 621 for use with the rocker arm push rod 69. Pushing the rocker arm push rod 69 to slide can drive the rocker arm structure to make corresponding adjustments.

[0046] In this embodiment, as Figure 2-5 As shown, the slide bar adjustment mechanism 4 includes a slide bar mounting base 42 mounted on the base, a guide sleeve 43 mounted in conjunction with the slide bar mounting base 42, a slide bar assembly slidably mounted in the guide sleeve 43, and a measuring push rod assembly mounted in conjunction with the slide bar assembly; the measuring push rod assembly is mounted at the end of the slide bar assembly and is used to push the needle valve 7 against the needle valve conical surface positioning mechanism 6.

[0047] The slide rod mounting base 42 is fixedly installed on the base 1, serving as the basis for the integrated installation of other related components. The upper end of the slide rod mounting base 42 has a mounting hole. The guide sleeve 43 is fixedly installed on the slide rod mounting base 42. This technical solution uses a clamping pin 46 for installation. Of course, screw locking or other methods can also be used. The slide rod assembly can slide and adjust along the axial direction of the guide sleeve 43. The measuring push rod assembly is fixedly installed at the end of the slide rod assembly to cooperate with the tail end of the needle valve 7 (the other end opposite the conical end) for installation. The end of the guide sleeve 43 has a guide sleeve wing plate 431. The two guide sleeve wing plates 431 with the same structure are arranged parallel to each other to ensure that the slide rod assembly will not rotate during the sliding adjustment process.

[0048] In this embodiment, as Figure 2-5 As shown, the slide rod assembly includes a slide rod 46 that is slidably and adjustablely installed in the guide sleeve 43, a limiting block 47 installed in the guide sleeve 43 for sliding and limiting the slide rod 46, a measuring positioning post 41 fixedly installed at the front end of the slide rod, and a return spring 48 installed in the slide rod 46; the slide rod 46 is a hollow tubular structure, and a waist-shaped slot 461 is opened on the slide rod 46. The limiting block 47 passes through the waist-shaped slot 461, and the return spring 48 is installed between the measuring positioning post 41 and the limiting block 47.

[0049] The slide rod 46 is a hollow tubular structure, with its front end fixedly installed in conjunction with the measuring positioning post 41. Two parallel, waist-shaped grooves 461 are formed on the slide rod 46. A limiting block 47 is installed inside the guide sleeve 43 and passes through the two waist-shaped grooves 461, allowing the slide rod 46 to be limited during sliding adjustment via the waist-shaped grooves 461 and the limiting block 47. A return spring 48 is installed between the measuring positioning post 41 and the limiting block 47. Figure 4 In use, pull the slide bar 46 to the right. At this time, the return spring 46 begins to compress. After pulling to the maximum position, install the needle valve 7 onto the V-shaped positioning mechanism. Then release the slide bar 46. The slide bar 46 begins to return to its original position under the action of the return spring 48. The measuring push rod assembly pushes the needle valve 7 to press against the needle valve conical surface positioning mechanism 6, and the measurement can then be performed.

[0050] In this embodiment, the measuring push rod assembly includes a push rod 45 fixedly installed at the end of the slide rod 46, a locking member 44 that cooperates with the slide rod 46 to fix and lock the slide rod, and a push handle provided at the end of the slide rod 46. The push handle has a vertical pushing surface 451 and a receiving surface 452 for pushing the needle valve 7 to move axially.

[0051] The push rod 45 is fixedly installed in conjunction with the push rod part 462 at the tail end of the slide rod 46. After the two are inserted, they are fixedly installed by the locking part 44 (a locking bolt can be used). The end of the push rod 45 forms a push handle structure. The push handle forms a vertical pushing surface 451 and a receiving surface 452, which facilitates the axial movement of the needle valve 7 (i.e., the length direction of the needle valve 7) and abuts against the needle valve conical positioning mechanism 6.

[0052] In this embodiment, as Figure 6 As shown, the V-shaped positioning mechanism 3 includes a V-shaped positioning seat 32 mounted on the base 1 and a gantry 31 fixedly mounted on the V-shaped positioning seat 32. A locking rod for locking the needle valve 7 to the V-shaped positioning seat 32 in the vertical direction is mounted on the gantry 31.

[0053] The V-shaped positioning seat 32 has a V-shaped positioning seat opening 33, which is used to cooperate with the base 1 for fixed installation. The upper end of the gantry 31 has a gantry opening 34. After the needle valve is installed on the V-shaped positioning seat 32, the locking rod passes through the gantry opening 34 to lock the test piece vertically.

[0054] In this embodiment, as Figure 1 As shown, the measuring mechanism 5 includes a measuring base 5 mounted on the base 1 and a measuring instrument (using a dial indicator or micrometer, not shown in the figure). The measuring base 5 has a measuring base mounting hole 51 for locking and mounting the measuring instrument.

[0055] The dial indicator is inserted into the mounting hole 51 of the measuring base and locked in place by the locking bolt. During installation, ensure that the measuring end of the dial indicator is in contact with the measuring positioning column 41. When in use, first measure the standard workpiece to be measured and record the measurement value. Then, install the subsequent workpiece to be measured on the device for testing. The measurement value is used to compare with the measurement value of the standard workpiece to confirm whether the workpiece accuracy meets the processing requirements.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0057] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A needle valve length detection device characterized by: The utility model relates to a needle valve positioning device, including base (1), install on base (1) needle valve taper positioning mechanism (6), install on base (1) V type positioning mechanism (3), set up in base (1) side for the slide bar adjusting mechanism (4) of needle valve (7) and set up on base (1) measuring mechanism (5), needle valve taper positioning mechanism (6) including taper positioning seat (61), rotatable adjusting install on taper positioning seat (61) left rocker arm assembly and right rocker arm assembly, needle valve (7) install on V type positioning mechanism (3) through slide bar adjusting mechanism (4) and be tightly closed between left rocker arm assembly and right rocker arm assembly and through measuring mechanism (5) detect length.

2. The needle valve length detection apparatus according to claim 1, characterized by: Right rocker arm assembly includes rotatable adjusting install on taper positioning seat (61) right rocker arm (62) and cooperate right rocker arm (62) fixed installation right positioning column (63), left rocker arm assembly includes rotatable adjusting install on taper positioning seat (61) left rocker arm (65) and cooperate left rocker arm (65) fixed installation left positioning column 64, needle valve (7) taper install between right positioning column (63) and left positioning column (64).

3. The needle valve length detection apparatus according to claim 2, characterized by: Left rocker arm assembly and right rocker arm assembly structure are same, right rocker arm (62) whole presents L type structure, right rocker arm (62) front end forms the rocker arm installation mesa of cooperation right positioning column (64) fixed installation, right rocker arm (62) is provided with the positioning column locking hole (68) of cooperation right positioning column (64) fixed installation on.

4. The needle valve length detection apparatus according to claim 2, characterized by: Right rocker arm (62) is provided with taper vertical positioning hole on along the vertical direction cooperation taper positioning seat (61) fixed installation, right rocker arm (62) and left rocker arm (65) are all provided with rocker arm spacing adjusting hole (67) of cooperation two spacing adjustment.

5. The needle valve length detection apparatus according to claim 2, characterized by: Taper positioning seat (61) is formed with positioning seat boss on the protrusion, positioning seat boss is provided with rocker arm top rod (69) for pushing right rocker arm assembly and left rocker arm assembly to carry out rotatable adjustment on the penetration.

6. The needle valve length detection apparatus according to claim 1, characterized by: Slide bar adjusting mechanism (4) includes slide bar mounting seat (42) installed on base (1), guide sleeve (43) installed in cooperation with slide bar mounting seat (42), slide bar assembly slidably installed in guide sleeve (43) and measurement push rod assembly installed in cooperation with slide bar assembly, measurement push rod assembly is installed on the end of slide bar assembly and is used to push needle valve (7) to be tightly closed to needle valve taper positioning mechanism (6).

7. The needle valve length detection apparatus according to claim 6, characterized by: Slide bar assembly includes slide bar (46) slidably installed in guide sleeve, limiting block (47) installed in guide sleeve (43) and used for slide limiting slide bar (46), measurement positioning column (41) fixedly installed on the front end of slide bar (46) and return spring (48) installed in slide bar (46), slide bar (46) is hollow tubular structure, slide bar (46) is provided with waist type slot (461), limiting block (47) is penetrated in waist type slot (461), return spring (48) is installed between measurement positioning column (41) and limiting block (47).

8. The needle valve length detection apparatus according to claim 7, characterized by: The measuring push rod assembly comprises a push rod fixedly installed at the end of the slide rod (46), a locking piece (44) fixedly installed in cooperation with the slide rod (46) and locking the slide rod (46), and a push handle provided at the end of the slide rod (46), wherein the push handle is formed with a vertical pushing surface (451) for pushing the needle valve to move axially and a receiving surface (452).

9. The needle valve length detection apparatus according to claim 1, characterized by: The V-shaped positioning mechanism (3) comprises a V-shaped positioning seat (32) installed on the base (1) and a portal frame (31) fixedly installed on the V-shaped positioning seat (32), wherein the portal frame (31) is installed with a locking rod for locking the needle valve (7) in the V-shaped positioning seat (32) in the vertical direction.

10. The needle valve length detection apparatus according to claim 1, characterized by: The measuring mechanism (5) comprises a measuring seat (5) installed on the base (1) and a measuring device, wherein the measuring seat (1) is provided with a measuring seat mounting hole (51) for locking and mounting the measuring device.

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