An automatic positioning and pressing device and positioning method for EGR valve assembly

Abstract

The present application relates to the field of EGR valve assembly, in particular to an automatic positioning and pressing device and positioning method for EGR valve assembly, which comprises a tool support, a fixing mechanism for fixing the EGR valve is arranged on the tool support, and an assembling mechanism for assembling the EGR valve is also arranged, the fixing mechanism comprises a positioning seat for limiting the position of the EGR valve, and further comprises a clamping cylinder for clamping the EGR valve, the assembling mechanism comprises an upgoing cylinder for pushing the valve rod assembly to press, and a downgoing cylinder for pushing the EGR valve positioning block, and the fixing mechanism and the assembling mechanism are connected with a PLC control system. By arranging the fixing mechanism for fixing the EGR valve and the assembling mechanism for assembling the EGR valve, the assembling position and angle of each component of the EGR valve are fixed and clamped, and then the assembling of the EGR valve is carried out by the precise control of the fixing mechanism and the assembling mechanism by the PLC, so as to better solve the problem of inaccurate length and size tolerance precision of the assembly of each component of the EGR valve.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of EGR valve assembly, in particular to an automatic positioning and pressing device for EGR valve assembly and a positioning method. BACKGROUND

[0002] EGR valve, i.e. exhaust gas recirculation valve, is a mechatronic product that can be installed on a gasoline engine to control the amount of exhaust gas recirculation fed back to the intake system. Installing EGR valve on gasoline engine can effectively reduce combustion chamber temperature, improve engine efficiency, improve combustion environment, reduce engine load and prolong the service life of each part. The main structure of EGR valve includes valve body, valve stem, cone valve, spring, positioning block and motor transmission assembly.

[0003] In the structure of EGR valve body, the line connecting the center of the positioning block at the motion conversion position and the center of the motor transmission assembly mounting hole has an angle requirement with the horizontal line, which is generally 45 degrees. When assembling the EGR valve, the length and size tolerances of the valve body, valve stem, cone valve and positioning block are generally controlled, and the EGR valve is assembled by using pressure equipment and tooling parts. The assembly process needs to rely on manual operation, so it is easily affected by human factors, such as improper operation and assembly error, which leads to unstable precision and quality of the final product. Secondly, the assembly process involves the cooperation and connection of multiple parts, and if there are errors or deviations in the size and shape between the parts, it will also affect the precision and quality of the final product. This method of installing multiple devices and tooling cannot guarantee the final angle size, which affects the performance parameters of the product; at the same time, it will also increase the manufacturing precision requirements and cost of the parts. Therefore, an automatic positioning and pressing device for EGR valve assembly is needed to solve the problem of inaccurate length and size tolerance precision of EGR valve assembly. SUMMARY

[0004] The present application aims to overcome the problem of inaccurate length and size tolerance precision of EGR valve assembly in the prior art, and provides an automatic positioning and pressing device for EGR valve assembly. The pressing device is provided with a fixing mechanism for fixing the EGR valve, and also provided with an assembly mechanism for assembling the EGR valve. The fixing and clamping of each part of the EGR valve are performed according to the assembly position and angle of each part of the EGR valve, and then the assembly of the EGR valve is performed by PLC precise control of the operation of the fixing mechanism and the assembly mechanism, so as to better solve the problem of inaccurate length and size tolerance precision of EGR valve assembly.

[0005] In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions:

[0006] The application discloses an automatic positioning and pressing device for assembling an EGR valve, which comprises a tool support, a fixing mechanism for fixing the EGR valve and an assembling mechanism for assembling the EGR valve, wherein the fixing mechanism comprises a positioning seat for limiting the position of the EGR valve and a clamping cylinder for clamping the EGR valve, and the assembling mechanism comprises an upgoing cylinder for pushing the valve rod assembly to be pressed and a downgoing cylinder for pushing the positioning block of the EGR valve; and the fixing mechanism and the assembling mechanism are connected with a PLC control system.

[0007] The pressing device is provided with the fixing mechanism for fixing the EGR valve and the assembling mechanism for assembling the EGR valve, the components of the EGR valve are fixed and clamped according to the assembling position and angle of the components, and the assembling of the EGR valve is carried out through the accurate control of the fixing mechanism and the assembling mechanism by the PLC, so that the problem of the length tolerance and size tolerance inaccuracy of the components of the EGR valve is better solved, the control of the pressing device is accurate, the reliability is high, the maintenance is convenient and the labor cost is reduced.

[0008] As a preferred scheme of the application, the positioning seat comprises a protrusion and a limiting cylinder, the limiting cylinder is provided with a limiting block at the telescopic end for limiting the position of the positioning block of the EGR valve, and the limiting block passes through the protrusion. When the valve body assembly of the EGR valve is installed on the positioning seat, the motor driving assembly mounting hole of the EGR valve is first installed on the protrusion of the positioning seat, thereby playing a role of simply fixing the valve body, the limiting block passes through the protrusion to save space and make the structure compact, and the limiting block is inserted into the positioning block of the EGR valve when being extended to play a limiting role.

[0009] As a preferred scheme of the application, the angle between the line connecting the center of the limiting block and the center of the protrusion and the horizontal line is 45 degrees. The angle of 45 degrees can provide a suitable leverage ratio, so that the motor driving assembly can more easily overcome the friction and other resistance generated in the movement of the valve rod. At the same time, the angle also helps to reduce the deflection and swing of the valve rod in the vertical direction, thereby ensuring that the opening and closing actions of the EGR valve are more accurate and timely.

[0010] As a preferred scheme of the application, the protrusion is matched with the motor driving assembly mounting hole of the EGR valve, and the limiting block is matched with the positioning hole of the positioning block of the EGR valve, so that the installation is smooth and the installation error is reduced, and the assembling precision is improved.

[0011] As a preferred scheme of the application, the telescopic end of the clamping cylinder is provided with a pressing head corresponding to the valve body, and the pressing head is matched with the valve body. The pressing head and the protrusion stably clamp the valve body, so that the installation is smooth and the installation error is reduced, and the assembling precision is improved.

[0012] As a preferred scheme of the present application, the clamping cylinder is a rotary telescopic cylinder structure, so that the pressing head can rotate and press, and the clamping cylinder does not interfere with the installation and operation of other components before the clamping cylinder works, and the clamping cylinder rotates to a position matched with the valve body when the clamping cylinder works, and the EGR valve body is fixed by cooperating with the positioning seat.

[0013] As a preferred scheme of the present application, the telescopic end of the upgoing cylinder is provided with an upgoing pressing head matched with the cone valve corresponding to the valve rod assembly. The upgoing pressing head cooperates with the upgoing cylinder to run upward, pushes the cone valve of the EGR valve rod assembly upward, drives the valve rod to be inserted into the positioning block mounting hole, and makes the assembly position of the EGR valve rod assembly accurate.

[0014] As a preferred scheme of the present application, the telescopic end of the downgoing cylinder is provided with a positioning block clamp head matched with the EGR valve positioning block. The positioning block clamp head is sized to be suitable for the size of the positioning block, the positioning block is manually put into the positioning block clamp head, the downgoing cylinder drives the positioning block clamp head to run downward to the limiting position of the positioning block, and the assembly position of the positioning block is accurate.

[0015] As a preferred scheme of the present application, the downgoing cylinder is a double-piston cylinder structure, which can reduce the impact in the process of assembling the EGR valve positioning block, make the work of the cylinder more stable, and be beneficial to the stable installation of the EGR valve positioning block.

[0016] The automatic positioning method of the present application comprises the following steps:

[0017] A. installing the valve body assembly on the positioning seat and installing the part positioning block in the positioning block clamp head;

[0018] B. starting the PLC control system to drive the clamping cylinder to rotate and press the valve body by the pressing head;

[0019] C. controlling the downgoing cylinder to drive the positioning block clamp head, and driving the positioning block clamp head to drive the positioning block to move downward to the position matched with the limiting block;

[0020] D. controlling the limiting cylinder to drive the limiting block to run forward, and driving the limiting block to extend into the positioning hole of the positioning block;

[0021] E. controlling the upgoing cylinder to drive the upgoing pressing head and the valve rod assembly to move upward, driving the valve rod assembly to be inserted into the positioning block mounting hole of the positioning block in the guide sleeve, and completing the press fitting;

[0022] F. after the press fitting is completed, the upgoing cylinder and the upgoing pressing head are retracted, the downgoing cylinder and the positioning block clamp head are retracted, the clamping cylinder and the pressing head are loosened, and then the product is taken down, and the assembly of the second product can be performed.

[0023] The automatic positioning method is quick and accurate, has high reliability, is convenient to maintain and reduces labor cost, the control of the pressing device is accurate by using PLC control, the pressing mechanism stably fixes the valve body, the assembling mechanism accurately controls the valve body components to complete the assembly, and the angle between the line connecting the center of the limiting block and the center of the protrusion and the horizontal line is 45 degrees.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] 1. The EGR valve is assembled quickly and conveniently, the pressing device is provided with a fixing mechanism for fixing the EGR valve and an assembling mechanism for assembling the EGR valve, the fixing mechanism and the assembling mechanism are fixed and clamped according to the assembling position and angle of each component of the EGR valve, and then the assembling of the EGR valve is carried out by accurately controlling the fixing mechanism and the assembling mechanism through PLC, so that the length and size tolerance precision error of the assembly of each component of the EGR valve is better solved, the control of the pressing device is accurate by using PLC control, the reliability is high, the maintenance is convenient, and the labor cost is reduced.

[0026] 2. When the EGR valve body assembly is installed on the positioning seat, the motor transmission assembly mounting hole of the EGR valve is first installed on the protrusion of the positioning seat to simply fix the EGR valve body, the limiting block passes through the protrusion to save space and make the structure compact, and the limiting block is inserted into the EGR valve limiting block to limit when it is extended.

[0027] 3. The angle between the line connecting the center of the limiting block and the center of the protrusion and the horizontal line is 45 degrees, the 45-degree angle can provide a suitable leverage ratio, so that the motor transmission assembly can more easily overcome the friction and other resistance generated in the movement of the valve rod. At the same time, this angle also helps to reduce the deflection and swing of the valve rod in the vertical direction, thereby ensuring that the opening and closing actions of the EGR valve are more accurate and timely.

[0028] 4. The protrusion is matched with the motor transmission assembly mounting hole of the EGR valve, and the limiting block is matched with the positioning hole of the EGR valve limiting block, so that the installation is smooth and the installation error is reduced, and the assembly precision is improved.

[0029] 5. The clamping cylinder extension end is provided with a pressing head corresponding to the valve body, and the pressing head is matched with the valve body. The pressing head and the protrusion stably clamp the valve body, which also makes the installation smooth and reduces the installation error, and improves the assembly precision.

[0030] 6. The clamping cylinder is a rotary telescopic cylinder structure, so that the pressing head can rotate and press tightly, so that the clamping cylinder does not interfere with the installation and operation of other components before work, and rotates to the position matched with the valve body when the clamping cylinder works, and fixes the EGR valve body together with the positioning seat.

[0031] 7. The extension end of the upward cylinder is equipped with an upward pressure head corresponding to the valve stem assembly, which is matched with the cone valve. The upward pressure head works with the upward cylinder to move upward, pushing the cone valve of the EGR valve stem assembly upward, causing the valve stem to be inserted into the positioning block mounting hole, so that the assembly position of the EGR valve stem assembly is accurate.

[0032] 8. The size of the positioning block chuck is suitable for the size of the positioning block. The positioning block is manually placed into the positioning block chuck, and the downward cylinder drives the positioning block chuck to move down to the limit position of the positioning block, so that the positioning block is assembled in a precise position.

[0033] 9. The downward cylinder has a double-piston cylinder structure, which can reduce the impact during the assembly of the EGR valve positioning block, making the cylinder work more smoothly and facilitating the stable installation of the EGR valve positioning block.

[0034] 10. This automatic positioning method is fast, accurate, highly reliable, easy to maintain and reduces labor costs. The PLC control makes the control of the pressing device precise, so that the pressing mechanism can firmly fix the valve body, and then accurately control the assembly mechanism to complete the assembly of the valve body components. At the same time, the angle between the line connecting the center of the limit block and the center of the protrusion and the horizontal line is 45 degrees. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the present invention;

[0036] Figure 2 This is an enlarged structural diagram of region B of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the EGR valve assembled in this invention;

[0038] Figure 4 This is a side sectional view of the EGR valve AA.

[0039] Figure 5 A schematic diagram showing the angle between the line connecting the center of the EGR valve positioning block and the center of the motor drive assembly mounting hole and the horizontal line.

[0040] Figure 6 This is a schematic diagram of the structure of the EGR valve when assembled in this invention.

[0041] The markings in the diagram are: 1-Upward cylinder, 1.1-Upward pressure head, 2-Clamping cylinder, 2.1-Pressure head, 3-Downward cylinder, 3.1-Positioning block chuck, 4-Positioning seat, 4.1-Limit cylinder, 4.2-Protrusion, 4.3-Limiting block, 5-Base plate, 6-Bracket, 7-EGR valve, 7.1-Positioning block, 7.1.1-Positioning hole, 7.1.2-Positioning block mounting hole, 7.2-Valve stem, 7.3-Guide sleeve, 7.4-Valve body, 7.5-Cone valve, 7.6-Valve seat, 7.7-Motor drive assembly mounting hole. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention. Example 1

[0043] like Figures 1-6 As shown, an automatic positioning and pressing device for EGR valve assembly in this embodiment includes a tooling bracket 6. The tooling bracket 6 is provided with a fixing mechanism for fixing the EGR valve and an assembly mechanism for assembling the EGR valve. The fixing mechanism includes a positioning seat 4 for limiting the position of the EGR valve and a clamping cylinder 2 for clamping the EGR valve. The assembly mechanism includes an upward cylinder 1 for pushing the valve stem assembly for pressing and a downward cylinder 3 for pushing the EGR valve positioning block 7.1. Both the fixing mechanism and the assembly mechanism are connected to a PLC control system.

[0044] This press-fitting device is equipped with a fixing mechanism for securing the EGR valve 7 and an assembly mechanism for assembling the EGR valve. Corresponding to the assembly positions and angles of each component of the EGR valve, it fixes and clamps each component of the EGR valve. Then, the operation of the fixing mechanism and the assembly mechanism is precisely controlled by PLC to assemble the EGR valve. This better solves the problem of inaccurate length and dimensional tolerances in the assembly of each component of the EGR valve. The use of PLC control makes the press-fitting device precise, reliable, easy to maintain, and reduces labor costs. Example 2

[0045] like Figures 1-6 As shown, according to Embodiment 1, an automatic positioning and pressing device for EGR valve assembly includes a positioning seat 4 comprising a protrusion 4.2 and a limiting cylinder 4.1. The telescopic end of the limiting cylinder 4.1 is provided with a limiting block 4.3 that limits the position of the EGR valve positioning block 7.1, and the limiting block 4.3 passes through the protrusion 4.2.

[0046] When the EGR valve body assembly is installed on the positioning seat 4, the motor drive assembly mounting hole 7.7 of the EGR valve is first installed on the protrusion 4.2 of the positioning seat 4, which serves to simply fix the EGR valve body 7.4. The limiting block 4.3 passes through the protrusion 4.2 to save space and make the structure compact. When it extends, it is inserted into the positioning block 7.1 of the EGR valve to play a limiting role. Example 3

[0047] like Figures 1-6 As shown, in an EGR valve assembly automatic positioning and pressing device according to Embodiment 2, the angle between the line connecting the center of the limiting block 4.3 and the center of the protrusion 4.2 and the horizontal line is 45 degrees.

[0048] A 45-degree angle provides a suitable leverage ratio, allowing the motor drive assembly to more easily overcome the friction and other resistance generated during the movement of the valve stem 7.2. Simultaneously, this angle also helps reduce the vertical deflection and oscillation of the valve stem 7.2, thereby ensuring more precise and timely opening and closing of the EGR valve. Example 4

[0049] like Figures 1-6 As shown, according to an embodiment 3, an automatic positioning and pressing device for EGR valve assembly has a protrusion 4.2 that matches the mounting hole 7.7 of the EGR valve motor drive assembly, and a limiting block 4.3 that matches the positioning hole 7.1.1 of the EGR valve positioning block 7.1, which makes the installation smooth and reduces the installation error, thereby improving the assembly accuracy. Example 5

[0050] like Figures 1-6 As shown, according to an embodiment 4, an automatic positioning and pressing device for EGR valve assembly is provided with a pressing head 2.1 corresponding to the valve body 7.4 at the telescopic end of the clamping cylinder 2. The pressing head 2.1 matches the valve body 7.4, so that the pressing head 2.1 and the protrusion 4.2 cooperate stably to clamp the valve body 7.4, which also makes the installation smooth and reduces the installation error, and improves the assembly accuracy. Example 6

[0051] like Figures 1-6 As shown, according to Embodiment 5, an automatic positioning and pressing device for EGR valve assembly has a clamping cylinder 2 as a rotary telescopic cylinder structure.

[0052] This allows the clamping head 2.1 to rotate and clamp, ensuring that the clamping cylinder 2 does not interfere with the installation and operation of other components before it starts working. When the clamping cylinder 2 starts working, it rotates to a position that matches the valve body 7.4, and the EGR valve body is fixed in place with the positioning seat 4. Example 7

[0053] like Figures 1-6 As shown, according to an EGR valve assembly automatic positioning and pressing device according to Embodiment 6, the telescopic end of the upward cylinder 1 is provided with an upward pressure head 1.1 corresponding to the valve stem assembly, and the upward pressure head 1.1 is matched with the cone valve 7.5.

[0054] The upward pressure head 1.1 moves upward in conjunction with the upward cylinder 1, pushing the cone valve 7.5 of the EGR valve stem assembly upward, causing the valve stem 7.2 to be inserted into the mounting hole of the positioning block 7.1, so that the assembly position of the EGR valve stem assembly is accurate. Example 8

[0055] like Figures 1-6As shown, according to an embodiment 7, an automatic positioning and pressing device for assembling an EGR valve is provided with a positioning block clamp 3.1 at the telescopic end of the downward cylinder 3, and the positioning block clamp 3.1 matches the positioning block 7.1 of the EGR valve.

[0056] The size of the positioning block chuck 3.1 is suitable for the size of the positioning block 7.1. The positioning block 7.1 is manually placed into the positioning block chuck 3.1, and the downward cylinder 3 drives the positioning block chuck 3.1 to move downward to the limit position of the positioning block 7.1, so that the positioning block 7.1 is assembled in a precise position. Example 9

[0057] like Figures 1-6 As shown, according to an EGR valve assembly automatic positioning and pressing device of embodiment 8, the downward cylinder 3 is a double piston cylinder structure, which can reduce the impact on the EGR valve positioning block 7.1 during assembly, making the cylinder work more smoothly and facilitating the stable installation of the EGR valve positioning block 7.1. Example 10

[0058] This embodiment of the automatic positioning method for EGR valve assembly includes any one of the automatic positioning and pressing devices for EGR valve assembly in embodiments 1-9. The automatic positioning method is as follows:

[0059] A. Install the valve body assembly onto the positioning seat 4, and install the part positioning block 7.1 into the positioning block chuck 3.1;

[0060] B. Start the PLC control system to make the clamping cylinder 2 drive the clamping head 2.1 to rotate and clamp the valve body 7.4;

[0061] C. Control the downward cylinder 3 to drive the positioning block chuck 3.1, so that the positioning block chuck 3.1 drives the positioning block 7.1 to move downward to match the limit block 4.3;

[0062] D. Control the limit cylinder 4.1 to push the limit block 4.3 forward, so that the limit block 4.3 extends into the positioning hole 7.1.1 of the positioning block 7.1;

[0063] E. Control the upward cylinder 1 to drive the upward pressure head 1.1 and valve stem assembly to move upward. The valve stem assembly is inserted upward into the positioning block mounting hole 7.1.2 of the positioning block 7.1 in the guide sleeve 7.3 to complete the press-fitting.

[0064] F. After pressing is completed, the upward cylinder 1 and the upward pressing head 1.1 retract, the downward cylinder 3 and the positioning block chuck 3.1 retract, the clamping cylinder 2 and the pressing head 2.1 are released, and after the product is removed, the assembly of the second product can be carried out.

[0065] The automatic positioning method is quick and accurate, has high reliability, is convenient to maintain and reduces labor cost. The use of PLC control makes the control of the pressing device accurate, the pressing mechanism stably fixes the valve body 7.4, the assembly mechanism accurately controls the assembly of the valve body parts, and the angle between the line connecting the center of the limiting block 4.3 and the center of the convex 4.2 and the horizontal line is 45 degrees.

Claims

1. An automatic positioning and pressing device for EGR valve assembly, comprising a tooling bracket (6), characterized in that, The tooling bracket (6) is provided with a fixing mechanism for fixing the EGR valve and an assembly mechanism for assembling the EGR valve (7). The fixing mechanism includes a positioning seat (4) for limiting the position of the EGR valve and a clamping cylinder (2) for clamping the EGR valve. The assembly mechanism includes an upward cylinder (1) for pushing the valve stem assembly for press-fitting and a downward cylinder (3) for pushing the EGR valve positioning block (7.1). Both the fixing mechanism and the assembly mechanism are connected to the PLC control system. The positioning seat (4) includes a protrusion (4.2) and a limiting cylinder (4.1). The telescopic end of the limiting cylinder (4.1) is provided with a limiting block (4.3) for limiting the position of the EGR valve positioning block (7.1). The limiting block (4.3) extends from the protrusion (4.2). The line connecting the center of the limiting block (4.3) and the center of the protrusion (4.2) is at an angle of 45 degrees to the horizontal line; the protrusion (4.2) matches the mounting hole (7.7) of the EGR valve motor drive assembly, and the limiting block (4.3) matches the positioning hole (7.1.1) of the EGR valve positioning block (7.1); the extension end of the upward cylinder (1) is provided with an upward pressure head (1.1) corresponding to the valve stem assembly, and the upward pressure head (1.1) matches the cone valve (7.5); the upward cylinder (1) drives the valve stem to insert into the positioning block mounting hole of the EGR valve positioning block; the extension end of the downward cylinder (3) is provided with a positioning block chuck (3.1), and the positioning block chuck (3.1) matches the EGR valve positioning block (7.1).

2. The automatic positioning and pressing device for EGR valve assembly according to claim 1, characterized in that, The clamping cylinder (2) has a clamping head (2.1) on its telescopic end corresponding to the valve body (7.4), and the clamping head (2.1) is matched with the valve body (7.4).

3. The automatic positioning and pressing device for EGR valve assembly according to claim 2, characterized in that, The clamping cylinder (2) is a rotary telescopic cylinder structure.

4. The automatic positioning and pressing device for EGR valve assembly according to claim 3, characterized in that, The downward cylinder (3) is a double piston cylinder structure.

5. An automatic positioning method for EGR valve assembly, characterized in that, The automatic positioning and pressing device for EGR valve assembly as described in claim 4 includes the following steps: A. Install the valve body (7.4) assembly onto the positioning seat (4), and install the EGR valve positioning block (7.1) into the positioning block chuck (3.1); B. Start the PLC control system to make the clamping cylinder (2) drive the clamping head (2.1) to rotate and clamp the valve body (7.4); C. Control the downward cylinder (3) to drive the positioning block chuck (3.1), so that the positioning block chuck (3.1) drives the EGR valve positioning block (7.1) to move downward to match the limit block (4.3); D. Control the limit cylinder (4.1) to push the limit block (4.3) forward, so that the limit block (4.3) extends into the positioning hole (7.1.1) of the EGR valve positioning block (7.1); E. Control the upward cylinder (1) to drive the upward pressure head (1.1) and valve stem (7.2) assembly to move upward. The valve stem (7.2) assembly is inserted upward into the positioning block mounting hole (7.1.2) of the EGR valve positioning block (7.1) in the guide sleeve (7.3) to complete the press-fitting. F. After the pressing is completed, the upward cylinder (1) and the upward pressing head (1.1) retract, the downward cylinder (3) and the positioning block chuck (3.1) retract, the clamping cylinder (2) and the pressing head (2.1) are released, and after the product is removed, the assembly of the second product can be carried out.

Images