EGR (Exhaust Gas Recirculation) high-precision bolt positioning and mounting device and use method

Abstract

The invention provides an EGR high-precision bolt positioning and mounting device and a using method. The EGR high-precision bolt positioning and mounting device is characterized in that U-shaped handles are connected to the left side and the right side of a datum plate through bolts; eGR locking modules are connected to the left side and the right side of the top end of the datum plate through bolts; the supporting block is arranged at the top end of the datum plate through bolt connection and located between a first air cylinder installation frame and a second air cylinder installation frame in the EGR locking module. The EGR top or bottom bolt positioning module is arranged at the top end of the datum plate through bolt connection; according to the device, the datum plate, the EGR locking module, the supporting block, the EGR top or bottom bolt positioning module and the EGR peripheral side wall bolt positioning module are adopted, the installation process is simple, the efficiency is high, the positioning precision is high in the installation process, and the reliability is high. And during installation, the nut is more stable in position during installation, and the consistency of the torsion range is also ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bolt positioning and installation, in particular to the technical field of bolt positioning and installation, and more particularly to an EGR high-precision bolt positioning and installation device and a use method thereof. BACKGROUND

[0002] In the existing assembly process of EGR, bolts and nuts need to be installed. In order to ensure the position accuracy of bolt installation and the stability during torqueing, the torque range needs to be set during torqueing. The traditional manual positioning is easily affected by visual errors and operation shaking, and the torque is not uniformly applied, which leads to bolt hole deviation and affects the sealing surface fit. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide an EGR high-precision bolt positioning and installation device and a use method thereof, which solves the difficulties of the prior art.

[0004] To achieve the above-mentioned purpose and other related purposes, the present application provides an EGR high-precision bolt positioning and installation device and a use method thereof, which comprises:

[0005] A reference plate 1 is provided with a U-shaped handle 11 on the left and right sides through bolt connection;

[0006] An EGR locking module 2 is arranged on the left and right sides of the top end of the reference plate 1 through bolt connection;

[0007] A support block 3 is arranged between a No. 1 cylinder mounting bracket 21 and a No. 2 cylinder mounting bracket 22 of the EGR locking module 2 on the top end of the reference plate 1 through bolt connection;

[0008] An EGR top or bottom bolt positioning module 4 is arranged on the top end of the reference plate 1 through bolt connection;

[0009] An EGR four-around-side-wall bolt positioning module 5 is arranged on the top end of the reference plate 1 through bolt connection.

[0010] According to the preferred scheme, the EGR locking module 2 comprises:

[0011] A No. 1 cylinder mounting bracket 21 is arranged on the left or right side of the top end of the reference plate 1 through bolt connection;

[0012] A No. 2 cylinder mounting bracket 22 is arranged on the side away from the No. 1 cylinder mounting bracket 21 of the top end of the reference plate 1 through bolt connection;

[0013] Pushing cylinder 23, which is centrally threaded through the top of No. 1 cylinder mounting frame 21 by bolt connection, has cylinder rod 24 threaded centrally, which extends to the direction of No. 2 cylinder mounting frame 22 through No. 1 cylinder mounting frame 21 at the top, and has bolts threaded around the top end of cylinder rod 24;

[0014] Air outlet flange positioning block 25 is arranged on the side of No. 1 cylinder mounting frame 21 close to No. 2 cylinder mounting frame 22, and is connected to the cylinder rod in pushing cylinder 23 on one side by bolts;

[0015] Sliding bearing 26 is arranged on the top of No. 1 cylinder mounting frame 21 on the left and right sides of cylinder rod 24 by bolt connection;

[0016] Synchronous rod 27 is threaded centrally in sliding bearing 26, and is connected to air outlet flange positioning block 25 on one side by bolts;

[0017] Air inlet flange profiling groove 28 is centrally opened on the top end of No. 2 cylinder mounting frame 22 close to No. 1 cylinder mounting frame 21;

[0018] Pressing rod cylinder 29 is threaded on the top of No. 2 cylinder mounting frame 22 on the left and right sides of air inlet flange profiling groove 28, has pressing rod 210 threaded centrally, and has positioning hole clamping block 211 threaded on the top close to the side of air inlet flange profiling groove 28.

[0019] According to the preferred scheme, EGR top or bottom bolt positioning module 4 comprises:

[0020] Extension mounting base 41 is arranged on the top end of reference plate 1 by bolt connection;

[0021] Bearing mounting sleeve 42 is longitudinally threaded on the top of extension mounting base 41 by bolt connection, and has No. 1 linear bearing 43 threaded on the side close to support block 3;

[0022] No. 1 rotating rod 44 is transitionally threaded centrally in No. 1 linear bearing 43;

[0023] Side wall positioning reference block 45 is arranged directly below bearing mounting sleeve 42, and is connected to the side wall on the side close to support block 3 of extension mounting base 41 on one side by bolts.

[0024] According to the preferred scheme, EGR four-around side wall bolt positioning module 5 comprises:

[0025] A bearing mounting seat 51 is arranged at the top end of the reference plate 1 by bolt connection, and the bearing mounting seat 51 is provided with several;

[0026] A second linear bearing 52 is transversely arranged at the top of the bearing mounting seat 51.

[0027] A second rotating rod 53 is transitionally arranged in the second linear bearing 52.

[0028] According to the preferred embodiment, the first rotating rod 44 and the second rotating rod 53 are integrally provided with a torque wrench joint 6 on the side away from the support block 3, and the first rotating rod 44 and the second rotating rod 53 are provided with a bolt mounting head 61 on the side close to the support block 3 by bolt connection, the bolt mounting head 61 is provided with a clearance hole in the middle, the bolt mounting head 61 is provided with a threaded clamping hole 62 at the top, the bolt mounting head 61 is provided with a bolt head profiling groove 63 at the bottom, the clearance hole, the threaded clamping hole 62 and the bolt head profiling groove 63 are communicated, the minimum inner diameter of the bolt head profiling groove 63 is greater than the hole diameter of the clearance hole, and the hole diameter of the clearance hole is greater than the hole diameter of the threaded clamping hole 62.

[0029] According to the preferred embodiment, a first weight-reducing groove 12 is arranged at the top end of the reference plate 1 between the support block 3 and the first cylinder mounting frame 21 and the second cylinder mounting frame 22.

[0030] According to the preferred embodiment, a second weight-reducing groove 54 is arranged in the middle of the bearing mounting seat 51.

[0031] According to the preferred embodiment, a profiling groove 31 is arranged at the top end of the support block 3.

[0032] The use process includes:

[0033] S1: the bottom of the first rotating rod 44 and the second rotating rod 53 in the EGR top or bottom bolt positioning module 4 and the EGR four-side wall bolt positioning module 5 is equipped with the corresponding bolt mounting head 61;

[0034] S2: when in use, the side of the EGR to be installed without screwing the bolt is abutted against the side wall positioning reference block 45;

[0035] S3: the EGR is clamped into the support block 3, the EGR exhaust end is sleeved into the exhaust flange positioning block 25, the EGR inlet flange is clamped into the inlet flange profiling groove 28, and the preliminary positioning of the EGR is completed;

[0036] S4: the push cylinder 23 and the pressure rod cylinder 29 in the EGR locking module 2 are driven to lock and limit the EGR;

[0037] S5: the corresponding specification bolt is clamped into the bolt head profiling groove 63 in the bolt mounting head 61.

[0038] S6: Lower the first rotating rod 44 and the second rotating rod 53 to make the bottom of the bolt to be installed abut against the threaded hole orifice on the EGR outer wall;

[0039] S7: After the torque wrench is set to the required torque, it is sleeved outside the torque wrench joint 6, and the bolt is rotated and installed into the corresponding bolt hole;

[0040] S8: Lift the first rotating rod 44 and the second rotating rod 53, reset the control push cylinder 23 and the push rod cylinder 29, and remove the EGR with the installed bolt.

[0041] The application adopts the reference plate, the EGR locking module, the support block 3 EGR top or bottom bolt positioning module and the EGR four surrounding side wall bolt positioning module, the installation process is simple and efficient, and the positioning accuracy is high during installation, the nut is not shaken during installation, the position is more stable during installation, and the consistency of the torque range is also ensured.

[0042] The optimal embodiments for implementing the application will be described in more detail below with reference to the accompanying drawings, so that the features and advantages of the application can be easily understood. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 The application is shown as a schematic diagram of the three-dimensional structure;

[0044] Figure 2 The application is shown as a schematic diagram of the three-dimensional structure of one side of the first cylinder mounting frame of the EGR locking module;

[0045] Figure 3 The application is shown as a schematic diagram of the three-dimensional structure of one side of the second cylinder mounting frame of the EGR locking module;

[0046] Figure 4 The application is shown as an explosion view of the EGR top or bottom bolt positioning module;

[0047] Figure 5 The application is shown as a schematic diagram of the three-dimensional structure of the EGR four surrounding side wall bolt positioning module;

[0048] Figure 6 The application is shown as a schematic diagram of the three-dimensional structure of the bolt installation head of the torque wrench joint;

[0049] REFERENCE NUMERALS

[0050] 1, reference plate; 11, U-shaped handle; 12, first weight-reducing groove;

[0051] 2, EGR locking module; 21, No. 1 cylinder mounting frame; 22, No. 2 cylinder mounting frame; 23, push cylinder; 24, cylinder rod; 25, gas flange positioning block; 26, sliding bearing; 27, synchronization rod; 28, air inlet flange profiling groove; 29, pressure rod cylinder; 210, pressure rod; 211, positioning hole clamping block;

[0052] 3, support block; 31, profiling groove;

[0053] 4, EGR top or bottom bolt positioning module; 41, extension mounting seat; 42, bearing mounting sleeve; 43, No. 1 linear bearing; 44, No. 1 rotating rod; 45, side wall positioning reference block;

[0054] 5, EGR four-around side wall bolt positioning module; 51, bearing mounting seat; 52, No. 2 linear bearing; 53, No. 2 rotating rod; 54, No. 2 weight reduction groove;

[0055] 6, torque wrench joint; 61, bolt mounting head; 62, threaded clamping hole; 63, bolt head profiling groove. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical scheme and advantages of the technical scheme of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely in the following with reference to the drawings of the specific embodiments of the present application. The same reference signs in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0057] Compared with the embodiments shown in the drawings, the feasible implementation schemes within the scope of protection of the present application can have fewer components, have other components not shown in the drawings, have different components, have differently arranged components or have differently connected components, etc. In addition, two or more components in the drawings can be implemented in a single component, or a single component shown in the drawings can be implemented as a plurality of separate components.

[0058] Unless otherwise defined, technical terms or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "first", "second", and the like, as used herein do not have any specific meaning, and are used only to distinguish one element from another. Also, the terms "a" and "an" do not necessarily mean "one", and the terms "one or more" mean "one or more than one". The term "including" as used herein is meant to be equivalent to the term "comprising" and thus is used in the same way. The term "connected" or "coupled" as used herein is not limited to direct connections or couplings, but can also include indirect connections or couplings, and can also include electrical connections or couplings, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are used only to indicate relative positions, and can change when the absolute positions of the described objects change.

[0059] The present application provides an EGR high-precision bolt positioning installation device and a use method, which is used in the EGR assembly process. The type of EGR to be installed is not limited, but the reference plate 1, the EGR locking module 2, the support block 3, the EGR top or bottom bolt positioning module 4 and the EGR four surrounding side wall bolt positioning module 5 structure are particularly suitable for bolt positioning installation in the EGR assembly.

[0060] In general, the EGR high-precision bolt positioning installation device and the use method provided by the present application mainly include a reference plate 1, an EGR locking module 2, a support block 3, an EGR top or bottom bolt positioning module 4 and an EGR four surrounding side wall bolt positioning module 5. For details, please refer to Figure 1 which shows the arrangement relationship of the reference plate 1, the EGR locking module 2, the support block 3, the EGR top or bottom bolt positioning module 4 and the EGR four surrounding side wall bolt positioning module 5.

[0061] The application provides an EGR high-precision bolt positioning and mounting device and a use method. Before use, a first rotating rod 44 and a second rotating rod 53 at the bottom of an EGR top or bottom bolt positioning module 4 and an EGR four-side wall bolt positioning module 5 are provided with corresponding bolt mounting heads 61. When in use, the side of the EGR to be mounted without bolts is abutted against the side wall positioning reference block 45, the EGR bottom is clamped into the supporting block 3, the EGR gas outlet end is sleeved into the gas outlet flange positioning block 25, the EGR gas inlet end flange is clamped into the gas inlet flange profiling groove 28, after the preliminary positioning of the EGR is completed, the push cylinder 23 and the pressing rod cylinder 29 in the EGR locking module 2 are driven to lock and limit the EGR, the corresponding bolt is clamped into the bolt head profiling groove 63 in the bolt mounting head 61, the first rotating rod 44 and the second rotating rod 53 are pressed to make the bottom of the bolt to be mounted abut against the threaded hole orifice on the outer wall of the EGR, the torque wrench is sleeved outside the torque wrench joint 6 after the required torque is set, the torque wrench is rotated to screw the bolt into the corresponding bolt hole, the first rotating rod 44 and the second rotating rod 53 are lifted, the push cylinder 23 and the pressing rod cylinder 29 are reset, and then the EGR with the completed bolt mounting can be taken down. The whole mounting process is efficient, the positioning accuracy is high during installation, the nuts will not shake during installation, the position is more stable during nut installation, the consistency of the torque range is ensured, and the like.

[0062] The left and right sides of the reference plate 1 are provided with U-shaped handles 11 through bolt connection, the top end of the reference plate 1 is provided with a first weight reduction groove 12 between the supporting block 3 and the first cylinder mounting frame 21 and the second cylinder mounting frame 22, and the bearing mounting seat 51 is provided with a second weight reduction groove 54 in the middle, so that the overall portability of the device is improved.

[0063] The EGR locking module 2 is arranged on the left and right sides of the top end of the reference plate 1 by bolt connection, and comprises a No. 1 cylinder mounting frame 21, a No. 2 cylinder mounting frame 22, a push cylinder 23, an exhaust flange positioning block 25, a sliding bearing 26, a synchronous rod 27, an air inlet flange profiling groove 28 and a pressure rod cylinder 29. The No. 1 cylinder mounting frame 21 is arranged on the left or right side of the top end of the reference plate 1 by bolt connection, the No. 2 cylinder mounting frame 22 is arranged on the side of the top end of the reference plate 1 away from the No. 1 cylinder mounting frame 21 by bolt connection, the push cylinder 23 is arranged on the top center of the No. 1 cylinder mounting frame 21 by bolt connection, the push cylinder 23 is arranged with a cylinder rod 24 in the center, the cylinder rod 24 extends to the direction of the No. 2 cylinder mounting frame 22 through the No. 1 cylinder mounting frame 21 at the top, bolts are arranged around the top end of the cylinder rod 24, the exhaust flange positioning block 25 is arranged on the side of the No. 1 cylinder mounting frame 21 close to the No. 2 cylinder mounting frame 22, the side of the exhaust flange positioning block 25 is connected with the cylinder rod of the push cylinder 23 by bolt, the sliding bearings 26 are arranged on the left and right sides of the cylinder rod 24 on the top of the No. 1 cylinder mounting frame 21 by bolt connection, the synchronous rod 27 is arranged in the center of the sliding bearings 26, the side of the synchronous rod 27 is connected with the exhaust flange positioning block 25 by bolt, the air inlet flange profiling groove 28 is arranged on the side of the top center of the No. 2 cylinder mounting frame 22 close to the No. 1 cylinder mounting frame 21, the pressure rod cylinder 29 is arranged on the left and right sides of the air inlet flange profiling groove 28 on the top of the No. 2 cylinder mounting frame 22, the pressure rod cylinder 29 is arranged with a pressure rod 210 in the center, the top of the pressure rod 210 is arranged with a positioning hole clamping block 211 close to the side of the air inlet flange profiling groove 28, wherein the exhaust flange positioning block 25 and the air inlet flange profiling groove 28 can be flexibly adjusted according to the installation direction of the EGR, and are suitable for different models or layouts of the EGR, and each part can be independently and detachably arranged, so that the whole does not need to be replaced if a part is damaged, thereby reducing the maintenance cost.

[0064] The EGR top or bottom bolt positioning module 4 is arranged on the top end of the reference plate 1 by bolt connection, and comprises an extension mounting seat 41, a bearing mounting sleeve 42, a No. 1 rotating rod 44 and a side wall positioning reference block 45. The extension mounting seat 41 is arranged on the top end of the reference plate 1 by bolt connection, the bearing mounting sleeve 42 is arranged longitudinally through the top of the extension mounting seat 41 by bolt connection, the No. 1 linear bearing 43 is arranged on the side of the bearing mounting sleeve 42 close to the support block 3, the No. 1 rotating rod 44 is arranged in the center of the No. 1 linear bearing 43 by transition fit, and the side wall positioning reference block 45 is arranged directly below the bearing mounting sleeve 42, and the side of the side wall positioning reference block 45 is connected with the side wall on the side of the extension mounting seat 41 close to the support block 3 by bolt.

[0065] The EGR four-side wall bolt positioning module 5 is arranged on the top end of the reference plate 1 by bolt connection, and comprises a bearing mounting seat 51, a second linear bearing 52 and a second rotating rod 53. The bearing mounting seat 51 is arranged on the top end of the reference plate 1 by bolt connection, and a plurality of bearing mounting seats 51 are arranged. The second linear bearing 52 is transversely arranged on the top of the bearing mounting seat 51, and the second rotating rod 53 is transversely and tightly arranged in the second linear bearing 52.

[0066] The rotating rod in the EGR top or bottom bolt positioning module 4 and the EGR four-side wall bolt positioning module 5 is arranged in the linear bearing by transition fit, so that the rotating rod has damping feeling during up and down movement, and the rotating rod cannot be stuck during EGR positioning and locking installation, the straightness of the rotating rod during axial or radial movement is ensured, the positioning deviation caused by rotation hand pause during subsequent installation by a torque wrench is avoided, the precision of the bolt positioning point and the stability during installation are ensured.

[0067] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the present application should be covered by the claims of the present application.

Claims

1. An EGR high precision bolt positioning installation device and method of use, characterized in that, Include: The reference plate (1) is provided with a U-shaped handle (11) on the left and right sides by bolt connection; EGR locking module (2), the EGR locking module (2) is arranged on the left and right sides of the top end of the reference plate (1) by bolt connection; Support block (3), the support block (3) is arranged between the top end of the reference plate (1) and the No. 1 cylinder mounting bracket (21) and the No. 2 cylinder mounting bracket (22) in the EGR locking module (2) by bolt connection; EGR top or bottom bolt positioning module (4), the EGR top or bottom bolt positioning module (4) is arranged at the top end of the reference plate (1) by bolt connection; EGR four around the side wall bolt positioning module (5), the EGR four around the side wall bolt positioning module (5) is arranged at the top end of the reference plate (1) by bolt connection.

2. The EGR high precision bolt positioning mounting device and method of use of claim 1, wherein, The EGR locking module (2) comprises: No. 1 cylinder mounting bracket (21), the No. 1 cylinder mounting bracket (21) is arranged on the left or right side of the top end of the reference plate (1) by bolt connection; No. 2 cylinder mounting bracket (22), the No. 2 cylinder mounting bracket (22) is arranged on the side away from the No. 1 cylinder mounting bracket (21) of the top end of the reference plate (1) by bolt connection; Push cylinder (23), the push cylinder (23) is arranged in the middle of the top of the No. 1 cylinder mounting bracket (21) by bolt connection, the push cylinder (23) is arranged in the middle of the cylinder rod (24), the cylinder rod (24) extends to the direction of the No. 2 cylinder mounting bracket (22) through the top of the No. 1 cylinder mounting bracket (21), and the cylinder rod (24) is arranged in the middle of the top of the No. 1 cylinder mounting bracket (21) by bolt connection. Exhaust flange positioning block (25), the exhaust flange positioning block (25) is arranged on the side of the No. 1 cylinder mounting bracket (21) close to the No. 2 cylinder mounting bracket (22), and the exhaust flange positioning block (25) is connected with the cylinder rod in the push cylinder (23) on one side through a bolt; Sliding bearing (26), the sliding bearing (26) is arranged on the top of the No. 1 cylinder mounting bracket (21) on the left and right sides of the cylinder rod (24) by bolt connection; Synchronous rod (27), the synchronous rod (27) is arranged in the middle of the sliding bearing (26), and the synchronous rod (27) is connected with the exhaust flange positioning block (25) on one side through a bolt; Air inlet flange profiling groove (28), the air inlet flange profiling groove (28) is arranged in the middle of the top end of the No. 2 cylinder mounting bracket (22) on the side close to the No. 1 cylinder mounting bracket (21); Pressing rod cylinder (29), the pressing rod cylinder (29) is arranged on the top of the No. 2 cylinder mounting bracket (22) on the left and right sides of the air inlet flange profiling groove (28), and the pressing rod cylinder (29) is arranged in the middle of the pressing rod (210), and the pressing rod (210) is arranged in the middle of the top of the No. 1 cylinder mounting bracket (21) by bolt connection.

3. The EGR high precision bolt positioning mounting device and method of use of claim 2, wherein, The EGR top or bottom bolt positioning module (4) comprises: Extension mounting seat (41), the extension mounting seat (41) is arranged at the top end of the reference plate (1) by bolt connection; Bearing mounting sleeve (42), the bearing mounting sleeve (42) is longitudinally threaded in the top of the extended mounting base (41) by bolt connection, the bearing mounting sleeve (42) is threaded with a linear bearing (43) near the side of the support block (3); A number of transition fitting transition rods (44) are threaded in the middle of the linear bearing (43); The side wall positioning reference block (45) is arranged below the bearing mounting sleeve (42), and the side wall positioning reference block (45) is connected with the side wall near the support block (3) side of the extended mounting base (41) by bolts.

4. The EGR high precision bolt positioning mounting device and method of use of claim 3, wherein, The EGR four around side wall bolt positioning module (5) comprises: The bearing mounting base (51) is arranged at the top end of the reference plate (1) by bolt connection, and the bearing mounting base (51) is provided with a plurality of; The second linear bearing (52) is transversely threaded in the top of the bearing mounting base (51); the second transition rod (53) is transitionally threaded in the middle of the second linear bearing (52).

5. The EGR high precision bolt positioning mounting device and method of use of claim 4, wherein, The one transition rod (44) and the second transition rod (53) are integrally provided with a torque wrench joint (6) away from the side of the support block (3), and the one transition rod (44) and the second transition rod (53) are provided with a bolt mounting head (61) near the side of the support block (3) by bolt connection, the bolt mounting head (61) is provided with a clearance hole in the middle, the bolt mounting head (61) is provided with a threaded clamping hole (62) at the top, and the bolt mounting head (61) is provided with a bolt head profiling groove (63) at the bottom, the clearance hole, the threaded clamping hole (62) and the bolt head profiling groove (63) are communicated, the minimum inner diameter of the bolt head profiling groove (63) is greater than the hole diameter of the clearance hole, and the hole diameter of the clearance hole is greater than the hole diameter of the threaded clamping hole (62).

6. The EGR high precision bolt positioning mounting device and method of use of claim 5, wherein, A first weight reduction groove (12) is arranged at the top end of the reference plate (1) between the support block (3) and the first and second cylinder mounting racks (21) and (22).

7. The EGR high precision bolt positioning mounting device and method of use of claim 6, wherein, The bearing mounting base (51) is provided with a second weight reduction groove (54) in the middle.

8. The EGR high precision bolt positioning mounting device and method of use of claim 7, wherein, The top end of the support block (3) is provided with a profiling groove (31).

9. The EGR high-precision bolt positioning installation device and the using method according to claim 8, wherein the specific steps comprise: S1: the bolt mounting head (61) is mounted on the bottom of the one transition rod (44) and the second transition rod (53) in the EGR top or bottom bolt positioning module (4) and the EGR four around side wall bolt positioning module (5); S2: when used, the side of the EGR to be installed without screwing the bolt is abutted against the side wall positioning reference block (45); S3: the EGR is clamped into the support block (3), the EGR exhaust end is sleeved into the exhaust flange positioning block (25), the EGR inlet end flange is clamped into the inlet flange profiling groove (28), and the preliminary positioning of the EGR is completed; S4: the push cylinder (23) and the pressure rod cylinder (29) in the EGR locking module (2) are driven to lock and limit the EGR. S5: in the bolt installation head (61) bolt head profiled groove (63) in the corresponding specification of the bolt; S6: down the first lever (44) and the second lever (53) to be installed bolt bottom against the EGR outer wall on the thread hole orifice; S7: the torque wrench set the required torque after the torque wrench joint (6) outside, rotating the torque wrench bolt into the corresponding bolt hole; S8: up the first lever (44) and the second lever (53), control push cylinder (23) and pressure rod cylinder (29) reset, remove the completed bolt installation of EGR.

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