Tool and method for setting the center of diesel engine SCR parts on gantry milling machine

Abstract

A tool and method for setting the center of a diesel engine SCR part on a gantry milling machine, the tool includes a rivet, a base part, an end cover, a moving rod, a limit device, a dial indicator device and a spring, the rivet is installed on the base part, and the rivet is tightened with a machine tool claw; the moving rod is installed on the base part, the end cover is fixed to the bottom end of the base part, the limit device is fixed to the base part, and the dial indicator device is installed and fixed to the first position or the second position of the limit device during precise measurement; the method for setting the center includes: first, installing a tool for setting the center on the spindle of the machine tool power accessory, second, making the front side of the base part parallel to the X-axis of the machine tool, and recording the spindle angle, third, aligning the center of the large end and the small end of the SCR part, fourth, correcting the center of the large end and the small end, and fifth, centering and determining the coordinate system. The present invention simplifies the process steps and operations, realizes direct centering of the SCR part on the gantry milling machine, improves the operating efficiency and positioning accuracy, and stabilizes the product quality.

Description

Technical Field

[0001] The invention relates to a processing technology for a metal workpiece, in particular to a tool and a method for setting the center of a diesel engine SCR part on a gantry milling machine, and belongs to the technical field of mechanical processing. Background Art

[0002] SCR (Selective Catalytic Reduction) technology is a new technology for treating diesel engine exhaust. First, it solves the problem of diesel engine particulate emissions by optimizing in-cylinder combustion and reducing oil consumption, and then uses SCR treatment devices to reduce engine NOx emissions. Therefore, the SCR system is an important device for marine low-speed diesel engines to optimize emissions and reduce pollution. Figure 1 The SCR part shown in the figure is a component of the SCR system. It is a large part with an irregular shape. Its structural characteristics are that the two ends of the middle shaft are provided with a cylinder with a large diameter, and the arc diameters of the two ends are inconsistent. The SCR part is generally processed using a gantry milling machine, and the SCR part needs to be clamped and centered on the workbench of the gantry milling machine. The prior art is to first use a scribing platform to mark the large end and the small end of the SCR part, and then determine the center of the part based on the scribing. Since the workpiece is large, a scribing platform needs to be built at the actual production site, and large scribing tools need to be used at the same time, which will increase labor costs and unsafe factors during operation; in addition, certain errors will be generated, part of which is the error caused by the use of conventional tools during the scribing process, and the other part is the secondary error of the gantry milling machine setting the center according to the scribing itself. Therefore, the current method of setting the center using conventional tools is not only of low accuracy, but also very cumbersome manual operation. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a tool and method for setting the center of diesel engine SCR parts on a gantry milling machine, so as to reduce positioning errors, simplify operating steps, improve operating efficiency and stabilize product quality.

[0004] The present invention adopts the following technical solutions to solve the technical problems:

[0005] A tool for setting the center of a diesel engine SCR part on a gantry milling machine, wherein the SCR part comprises a middle shaft portion and a large end and a small end at both ends thereof; the tool is characterized in that the tool comprises a pull nail, a base member, an end cover, a moving rod, a limit device, a dial indicator device and a spring;

[0006] The base part is connected to the main shaft of the power accessory of the machine tool through the rivet, and is provided with a cone body on the upper part to cooperate with the tapered hole of the power accessory of the machine tool, a limiting groove on the lower part, and waist-shaped straight grooves on both sides. The center line of the base part coincides with the center line of the power accessory of the machine tool, and the front side is parallel to the X-axis of the gantry milling machine;

[0007] The moving rod is a fork-shaped component, which is installed in the waist-shaped straight groove of the base component and can slide upward along the center line of the base component in the waist-shaped straight groove. The moving rod includes a central axis, a central ring, two clamping claws and two measuring rods. The central axis is horizontally inserted into the center of the central ring, and both ends are respectively embedded in the waist-shaped straight groove of the base component. The two clamping claws are symmetrically fixedly connected to the lower part of the central ring and extend out from the bottom of the base component. The two clamping claws form a fixed angle and the center line of the angle coincides with the center line of the base component. The two measuring rods are symmetrically fixedly connected to the upper part of the central ring and accommodated in the limiting groove of the base component. The inner groove wall of the limiting groove is in contact with the front and rear side surfaces of the central ring to limit the moving rod.

[0008] The spring is installed in the waist-shaped straight groove, the upper end is connected to the base member, and the arc portion of the lower end is pressed on the central axis of the moving rod;

[0009] The end cover is fixed to the lower end of the base member and supports the central axis;

[0010] The limiting device is fixed on the front side of the base member, and includes two upper and lower horizontal limiting blocks and a sliding track vertically fixedly connected between the two limiting blocks, the limiting block is provided with a limiting groove for limiting the moving rod, and the sliding track is provided with a track surface, and is provided with an upper fixing hole as a first position and a lower fixing hole as a second position;

[0011] The dial indicator device is fixed at the first position or the second position and the dial indicator is in contact with the moving rod.

[0012] As a further improvement, a conical surface for positioning is provided on the cone of the base member, and a rivet screw hole for connecting the rivet is provided at the top.

[0013] As a further improvement, the two jaws, the center ring and the two measuring rods are in the same plane and perpendicular to the axis of the center shaft, and the plane is parallel to the two side surfaces of the base member and the Y axis or Z axis of the machine tool.

[0014] As a further improvement, reinforcing ribs are connected between the two clamping claws and between the two measuring rods.

[0015] As a further improvement, the dial indicator device includes a dial indicator and a dial indicator fixture. The dial indicator fixture is fixed on the sliding track of the limiting device and can slide up and down along the track surface to adjust the position. The dial indicator is connected to the dial indicator fixture.

[0016] Another technical solution of the present invention is:

[0017] A method for setting the center of a diesel engine SCR part on a gantry milling machine using the above tool comprises the following specific steps:

[0018] Step 1: Install the center setting tool on the spindle of the machine tool power accessory:

[0019] Connect the pull nail to the center setting tool through a thread, tighten it with the claws of the machine tool power accessory, so that the conical surface of the base part and the spindle conical hole of the machine tool power accessory are closely fitted, and ensure that the center line of the base part coincides with the center line of the spindle of the machine tool power accessory. The dial indicator device is not installed yet;

[0020] Step 2: Use conventional methods to horizontally flatten the front side of the base member so that the front side is parallel to the X-axis of the machine tool, record the spindle angle, and directly fix it at this angle next time;

[0021] Step 3: Align the center of the large end and the small end of the SCR part:

[0022] First, move the spindle of the power accessory of the machine tool, visually observe that the two claws of the moving rod are tangent to the arc of the large end or the small end of the SCR part, then move the spindle, visually observe that the two measuring rods of the moving rod are aligned with the side plane of the base part, and record the mechanical coordinate data of the machine tool;

[0023] Step 4: Correct the center of the large end and the small end of the SCR part:

[0024] Installing the dial indicator device at a first position on the front side of the base member, and adjusting the dial indicator to zero;

[0025] Then, the dial indicator device is installed at a second position on the front side of the base component, and the spindle is fine-tuned so that the two measuring rods of the moving rod are aligned with the side plane of the base component, and the dial indicator value is the same as the value at the first position, and the mechanical coordinate data of the machine tool is corrected;

[0026] Step 5: Centering and coordinate system determination:

[0027] The origin of the coordinate system is calculated and determined through the center data of the large end and the small end of the SCR part.

[0028] The differences and beneficial effects of the present invention and the prior art are as follows:

[0029] 1. The present invention realizes precise positioning without the need for a marking process, does not require multiple processing steps, saves the time used for process conversion and transportation, and saves time and labor.

[0030] 2. The tool described in the present invention can ensure that the center line of the jaw angle is consistent with the center line of the main shaft of the machine tool power accessory, thereby achieving precise positioning and improving processing accuracy.

[0031] The beneficial technical effects of the present invention are: simplifying the process steps and operations, and achieving direct centering by installing the tool on the gantry milling machine, thereby greatly improving the operating efficiency and positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of SCR parts.

[0033] Figure 2 It is a structural schematic diagram of the present invention.

[0034] Figure 3 It is a schematic diagram of the basic parts.

[0035] Figure 4 It is a schematic diagram of the structure of the moving rod.

[0036] Figure 5 is a schematic diagram of the limit device.

[0037] Figure 6 This is the installation position diagram of the dial indicator device.

[0038] Figure 7 This is a status diagram of the tool setting the center of the SCR part on the gantry milling machine.

[0039] Figure 8 This is a side centering diagram.

[0040] Fig. 9 This is a front centering diagram.

[0041] In the figure,

[0042] 1—SCR parts, 3—machine tool power accessories, 4—center setting tool, 6—pull nail, 7—cone, 8—base, 9—limit device, 10—dial gauge device, 11—hexagon socket screw, 12—moving rod, 13—end cover, 14—pin, 15—hexagon socket screw, 16—spring, 17—measuring rod, 18—claw, 19—reinforcement rib, 20—center shaft, 21—center ring, 22—limit block, 23—rail Road surface, 24—sliding track, 25—limiting groove, 26—threaded clearance hole, 27—pin hole, 28—upper fixing hole, 29—lower fixing hole, 30—conical surface, 31—pull nail screw hole, 32—front side surface, 33—threaded hole, 34—pin hole, 35—limiting groove, 36—waist-shaped straight groove, 37—center line of base part, 38—center line of straight groove, 39—arc part, A—large end, B—small end, C—first position, D—second position. DETAILED DESCRIPTION

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings, but the scope of protection claimed in the present invention shall not be limited thereby.

[0044] The present invention is used to set the center of the SCR parts of diesel engines on a gantry milling machine. Figure 1 The SCR part is a large part with irregular shape, including a middle shaft and cylinders at both ends: a large end A and a small end B.

[0045] See also Figure 2 The center setting tool 4 includes a pull nail 6, a base member 8, an end cover 13, a moving rod 12, a limit device 9, a dial indicator device 10 and a spring 16.

[0046] See also Figure 3 The base member 8 is a columnar component, which is connected to the machine tool spindle through the rivet 6. A cone 7 is provided on the upper part to cooperate with the tapered hole of the machine tool spindle for positioning. The cone 7 is provided with a conical surface 30 for positioning, and a rivet screw hole 31 for connecting the rivet 6 is provided at the top; a limiting groove 35 for limiting the moving rod 12 is provided at the lower part of the base member 8, and waist-shaped straight grooves 36 for installing the spring 16 are provided on both side surfaces, and the center line 38 of the waist-shaped straight groove 36 intersects with the center line 37 of the base member in the same plane; a threaded hole 33 and a pin hole 34 for fixing the limiting device 9 are provided on the front side 32 of the base member 8.

[0047] See also Figure 4The moving rod 12 is a fork-shaped member made of a lightweight and rigid material, and is installed on the base member 8; the moving rod 12 includes two claws 18, a central axis 20, a central ring 21 and two measuring rods 17. The central axis 20 is horizontally fixed and inserted into the center of the central ring 21, and its two ends are respectively inserted into the waist-shaped straight grooves 36 on both sides of the base member 8 and can slide up and down in the waist-shaped straight grooves 36. The two claws 18 are symmetrically fixedly connected to the lower part of the central ring 21, extending from the bottom of the base member 8, and are used to contact and measure the SCR parts; the two claws 18 are at a fixed angle, and a reinforcing rib 19 is connected between them to play a protective role. The reinforcing rib 19 adopts a movable solution to ensure maximum strength protection of the claws 18. The two measuring rods 17 are vertically and symmetrically fixedly connected to the upper part of the center ring 21 and are arranged in the limiting groove 35 of the base member 8. The measuring rods 17 are lightweight cylindrical to ensure that the contact surface is linear contact. A reinforcing rib 19 is connected between the two measuring rods 17 to play a protective role. The two clamping claws 18, the center ring 21 and the two measuring rods 17 are in the same plane and perpendicular to the axis of the center shaft 20. When the center line of the angle between the two clamping claws 18 coincides with the center line of the machine tool spindle (the center line 37 of the base member), the two measuring rods 17 are parallel to the two side surfaces of the base member 8.

[0048] See also Figure 2 The spring 16 is respectively installed in the waist-shaped straight grooves 36 on both sides of the base member 8, the upper end is connected to the base member 8, and the lower end is provided with an arc portion 39, which is pressed on the central axis 20 of the moving rod 12, and the central axis 20 of the moving rod 12 is ensured to return to the starting position through elastic force.

[0049] See also Figure 2 The end cover 13 is fixed to the lower end of the base member 8 by means of a pin 14 and a hexagon socket screw 15 , and supports the center shaft 20 to position the starting position of the center shaft 20 .

[0050] See also Figure 2 The limiting device 9 is installed on the front side 32 of the base member 8 by means of a hexagon socket screw 11, and comprises two upper and lower horizontal limiting blocks 22 and a sliding track 24 vertically fixedly connected between the two limiting blocks 22. Figure 5The limit block 22 is provided with a limit groove 25, a threaded clearance hole 26 and a pin hole 27. The limit groove 25 is used to limit the range of motion of the moving rod 12. The limit block 22 is fixedly connected to the threaded hole 33 and the pin hole 34 on the front side 32 of the base member 8 by means of screws and round pins through the threaded clearance hole 26 and the pin hole 27. The sliding track 24 is provided with an upper fixing hole 28 and a lower fixing hole 29 for fixing the dial indicator device 10 and a track surface 23 for positioning the dial indicator device 10.

[0051] The dial gauge device 10 is fixed to the limiter device 9 by means of hexagon socket screws and includes a dial gauge and a dial gauge fixture. Figure 6 The dial gauge fixture is fixed to the first position C or the second position D of the position limiting device 9 through the upper fixing hole 28 and the lower fixing hole 29. The dial gauge fixture is positioned in cooperation with the track surface 23 on the sliding track 24 of the position limiting device 9 and can slide up and down along the track surface 23 to adjust the position. The dial gauge is connected to the dial gauge fixture and the gauge head contacts the moving rod 12.

[0052] The assembly relationship of the components of the tool 4 for setting the center is as follows. Figure 2-Figure 6 :

[0053] 1. Install the rivet 6 on the cone 7 on the upper part of the base 8 through the rivet screw hole 31, tighten the rivet 6 with the machine tool claws, so that the conical surface 30 of the cone 7 fits tightly with the conical hole of the machine tool spindle for positioning, and ensure that the center line 37 of the base coincides with the center line of the machine tool spindle.

[0054] 2. Install the moving rod 12 in the limiting groove 35 of the base member 8, and fit the front and rear sides of the center ring 21 against the inner groove wall of the limiting groove 35 for positioning. The two ends of the center shaft 20 are respectively inserted into the waist-shaped straight groove 36, and then the arc portion 39 at the lower end of the spring 16 is pressed onto the center shaft 20. Then, the end cover 13 is fixed to the lower end surface of the base member 8 by the pin 14 and the hexagon socket screw 15 to support the center shaft 20, so that the moving rod 12 moves up and down in the waist-shaped straight groove 36 of the base member 8 along the center line 37 of the base member, and ensure that the center line of the moving rod 12 (the center line of the angle between the two claws 18) coincides with the center line 37 of the base member.

[0055] 3. Fix the limit device 9 to the threaded hole 33 and the pin hole 34 on the front side surface 32 of the base member 8 through the hexagon socket screw 11, the threaded clearance hole 26 and the pin hole 27. When making precise measurements, the dial indicator device 10 is fixedly mounted on the upper fixing hole 28 (first position C) or the lower fixing hole 29 (second position D) of the sliding track 24 of the limit device 9 through the track surface 23 and the hexagon socket screw.

[0056] The main steps of centering an SCR part on a gantry milling machine using the centering tool are as follows:

[0057] Step 1: Install the center setting tool 4 on the spindle of the machine tool power accessory 3, see Figure 8 and Fig. 9 ;

[0058] Connect the pull nail 6 to the center setting tool 4 through a thread, and tighten the core shaft with the claws of the machine tool power accessory 3, so that the conical surface 30 fits tightly with the conical hole of the main shaft of the machine tool power accessory 3, ensuring that the center line 37 of the base part coincides with the center line of the main shaft of the machine tool; the dial indicator device 10 and the positioning pin are not installed yet.

[0059] See also Figure 7 , the figure shows three states of the tool 4 for setting the center, (1) and (2) indicate that the center line 37 of the base part does not coincide with the center line of the machine tool spindle, and (3) indicates that the center line 37 of the base part coincides with the center line of the machine tool spindle.

[0060] Step 2: Use conventional methods to horizontally flatten the front side surface 32 of the base member 8 so that the front side surface 32 is parallel to the X-axis of the machine tool, and make sure that the plane where the two claws 18 of the moving rod 12 are located is parallel to the Y or Z axis of the machine tool; record the spindle angle and use this fixed angle next time.

[0061] Step 3: Align the center of the large end A and the small end B of the SCR part 1;

[0062] First, move the spindle of the machine tool power accessory 3, visually check that the two claws 18 of the moving rod 12 are tangent to the arc of the large end A or the small end B of the SCR part 1, then move the spindle, visually check that the two measuring rods 17 of the moving rod 12 are aligned with the side plane of the base part 8, and record the mechanical coordinate data of the machine tool;

[0063] Step 4: Correct the center of the large end A and the small end B of SCR part 1;

[0064] Install the dial indicator device 10 and the positioning pin at the first position C of the front side surface 32 of the base member 8, and adjust the dial indicator to zero;

[0065] Then install the dial indicator device 10 and the positioning pin at the second position D of the front side surface 32 of the base member 8, fine-tune the spindle, align the two measuring rods 17 of the moving rod 12 with the side plane of the base member 8, and the dial indicator value is the same as the value of the first position C, and correct the mechanical coordinate data of the machine tool;

[0066] Step 5: Centering and determining the coordinate system;

[0067] Calculate and determine the origin of the coordinate system through the data of the center of the large end A and the small end B of the SCR part 1;

[0068] See also Figure 8 , is a schematic diagram of side centering, showing the center of the Y-axis on the side of the SCR part 1 on the gantry milling machine, (4) is a schematic diagram of the large end A, (5) is a side elevation view, and (6) is a schematic diagram of the small end B.

[0069] See also Fig. 9 , is a front centering diagram, showing the center of the front Z axis of SCR part 1 on the gantry milling machine. (7) is the centering view of the large end A, (8) is the front view of the end face, and (9) is the centering view of the small end B.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. The protection scope required by the present invention should also include obvious changes and alternatives to the present invention.

Claims

1. A tool for setting the center of a diesel engine SCR part on a gantry milling machine, wherein the SCR part comprises a middle shaft portion and a large end and a small end at both ends; characterized in that: The center setting tool includes a pull nail, a base member, an end cover, a moving rod, a limit device, a dial indicator device and a spring; The base part is connected to the main shaft of the power accessory of the machine tool through the rivet, and is provided with a cone body on the upper part to cooperate with the tapered hole of the power accessory of the machine tool, a limiting groove on the lower part, and waist-shaped straight grooves on both sides. The center line of the base part coincides with the center line of the power accessory of the machine tool, and the front side is parallel to the X-axis of the gantry milling machine; The moving rod is a fork-shaped component, which is installed in the waist-shaped straight groove of the base component and can slide upward along the center line of the base component in the waist-shaped straight groove. The moving rod includes a central axis, a central ring, two clamping claws and two measuring rods. The central axis is horizontally inserted into the center of the central ring, and both ends are respectively embedded in the waist-shaped straight groove of the base component. The two clamping claws are symmetrically fixedly connected to the lower part of the central ring and extend out from the bottom of the base component. The two clamping claws form a fixed angle and the center line of the angle coincides with the center line of the base component. The two measuring rods are symmetrically fixedly connected to the upper part of the central ring and accommodated in the limiting groove of the base component. The inner groove wall of the limiting groove is in contact with the front and rear side surfaces of the central ring to limit the moving rod. The spring is installed in the waist-shaped straight groove, the upper end is connected to the base member, and the arc portion of the lower end is pressed on the central axis of the moving rod; The end cover is fixed to the lower end of the base member and supports the central axis; The limiting device is fixed on the front side of the base member, and includes two upper and lower horizontal limiting blocks and a sliding track vertically fixedly connected between the two limiting blocks, the limiting block is provided with a limiting groove for limiting the moving rod, and the sliding track is provided with a track surface, and is provided with an upper fixing hole as a first position and a lower fixing hole as a second position; The dial indicator device is fixed at the first position or the second position and the dial indicator is in contact with the moving rod.

2. The tool for setting the center of a diesel engine SCR part on a gantry milling machine according to claim 1, characterized in that: A conical surface for positioning is arranged on the cone of the base component, and a rivet screw hole for connecting the rivet is arranged on the top.

3. The tool for setting the center of a diesel engine SCR part on a gantry milling machine according to claim 1, characterized in that: The two clamping claws, the center ring and the two measuring rods are in the same plane and are perpendicular to the axis of the center shaft. The plane is parallel to the two side surfaces of the base component and the Y axis or Z axis of the machine tool.

4. The tool for setting the center of a diesel engine SCR part on a gantry milling machine according to claim 1, characterized in that: Reinforcing ribs are connected between the two clamping claws and between the two measuring rods.

5. The tool for setting the center of the SCR parts of a diesel engine on a gantry milling machine according to claim 1, characterized in that: The dial indicator device comprises a dial indicator and a dial indicator fixture. The dial indicator fixture is fixed on the sliding track of the limiting device and can slide up and down along the track surface to adjust the position. The dial indicator is connected to the dial indicator fixture.

6. A method for setting the center of a diesel engine SCR part on a gantry milling machine using the tool of claim 1, characterized in that: The method for setting the center includes the following specific steps: Step 1: Install the center setting tool on the spindle of the machine tool power accessory: Connect the pull nail to the center setting tool through a thread, tighten it with the claws of the machine tool power accessory, so that the conical surface of the base part and the spindle conical hole of the machine tool power accessory are closely fitted, and ensure that the center line of the base part coincides with the center line of the spindle of the machine tool power accessory. The dial indicator device is not installed yet; Step 2: Use conventional methods to horizontally flatten the front side of the base member so that the front side is parallel to the X-axis of the machine tool, record the spindle angle, and directly fix it at this angle next time; Step 3: Align the center of the large end and the small end of the SCR part: First, move the spindle of the power accessory of the machine tool, visually observe that the two claws of the moving rod are tangent to the arc of the large end or the small end of the SCR part, then move the spindle, visually observe that the two measuring rods of the moving rod are aligned with the side plane of the base part, and record the mechanical coordinate data of the machine tool; Step 4: Correct the center of the large end and the small end of the SCR part: Installing the dial indicator device at a first position on the front side of the base member, and adjusting the dial indicator to zero; Then, the dial indicator device is installed at a second position on the front side of the base component, and the spindle is fine-tuned so that the two measuring rods of the moving rod are aligned with the side plane of the base component, and the dial indicator value is the same as the value at the first position, and the mechanical coordinate data of the machine tool is corrected; Step 5: Centering and coordinate system determination: The origin of the coordinate system is calculated and determined through the center data of the large end and the small end of the SCR part.

Images