A multiple crimping tool for EGR valve assembly

Abstract

The invention discloses a multiple crimping tool for EGR valve assembly, which relates to the technical field of valve seat assembly. Its main technical scheme includes: a base, a support column and a switching mechanism, wherein a second mounting groove is provided on the base; the support column is provided in the second mounting groove; when the support column is in the first state, the support column is used to stack the valve seat and the valve body in sequence, and the support column is also used to press the valve seat into the first mounting groove when the valve body moves downward; when the support column is in the second state, the support column can move along the notch of the second mounting groove toward the bottom of the second mounting groove until the valve body fits the upper end surface of the base; the base is used to bend the lower end of the valve body toward the direction of the first mounting groove when the valve body moves downward; the switching mechanism is used to switch the support column from the first state to the second state. The purpose of enhancing the connection strength between the valve seat and the valve body and thereby reducing the risk of the valve seat falling off from the valve body during the long-term use of the EGR valve is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of valve seat assembly, and in particular to a multiple crimping tool for EGR valve assembly. Background Art

[0002] The EGR (Exhaust Gas Recirculation) valve is a mechatronic product installed on a gasoline engine to control the amount of exhaust gas recirculation fed back to the intake system.

[0003] At present, when assembling the EGR valve, the valve seat is usually pressed into the valve body by a press-fitting device to achieve an interference fit between the valve seat and the valve body. This press-fitting method greatly increases the risk of the valve seat falling off the valve body when the EGR valve is used for a long time. Summary of the invention

[0004] The purpose of the present invention is to provide a multiple crimping tool for EGR valve assembly, which solves the problem of a high risk of valve seat falling off from the valve body in the existing press-fitting method.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The valve body is pressed against the bottom of the valve body and the valve seat is pressed against the bottom of the valve body to press the valve seat against the bottom of the valve body. The valve body is pressed against the bottom of the valve body and the valve seat is pressed against the bottom of the valve body to press the valve seat against the bottom of the valve body. The valve body is pressed against the bottom of the valve body and the valve seat is pressed against the bottom of the valve body. The valve body is pressed against the bottom of the valve body and the valve seat is pressed against the bottom of the valve body.

[0007] A further solution is that the depth of the first mounting groove is greater than the height of the valve seat.

[0008] A further solution is that the inner diameter of the second installation groove is smaller than the inner diameter of the first installation groove.

[0009] A further solution is: the side wall of the support column gradually moves away from the axis of the support column along the direction from the upper end of the support column to the lower end of the support column; the side wall of the support column is used to form a receiving groove with the lower end surface of the valve seat; the receiving groove is used to form an abutment portion on the side wall of the first mounting groove when the lower end of the valve body bends in the direction of the first mounting groove; wherein the abutment portion is used to fit against the lower end surface of the valve seat.

[0010] A further solution is: the multiple crimping tool also includes a rivet column; the rivet column is arranged on the upper end surface of the base; the upper end surface of the rivet column is used to fit with the valve body; the number of the rivet columns is set to be several, and the several rivet columns are evenly arranged around the second mounting groove.

[0011] A further solution is: the multiple crimping tool also includes an elastic member; the elastic member is arranged at the bottom of the second mounting groove; the elastic member extends along the bottom of the second mounting groove toward the direction of the second mounting groove opening, and the upper end of the elastic member is connected to the support column.

[0012] A further solution is: a through hole is provided at the lower end of the side wall of the base; the through hole is connected to the second mounting groove; the switching mechanism includes a telescopic member and a limit plate; the limit plate is inserted into the through hole; the telescopic member is connected to one end of the limit plate away from the second mounting groove; when the telescopic member drives the limit plate to move to the first position along the through hole toward the second mounting groove, the support column is in the first state; wherein, when the limit plate is in the first position, there is an overlapping area between the projection of the limit plate on the bottom of the second mounting groove and the projection of the support column on the bottom of the second mounting groove, and the limit plate is attached to the lower end surface of the support column; when the telescopic member drives the limit plate to move to the second position along the second mounting groove toward the through hole, the support column is in the second state; wherein, when the limit plate is in the second position, there is no overlapping area between the projection of the limit plate on the bottom of the second mounting groove and the projection of the support column on the bottom of the second mounting groove.

[0013] A further solution is: a limiting groove is opened at the lower end of the side wall of the second mounting groove; a limiting block is arranged at the lower end of the side wall of the support column; the limiting block is slidably arranged in the limiting groove; wherein, when the limiting block slides upward to the maximum position, the upper end surface of the limiting block abuts against the upper groove bottom of the limiting groove, and the limiting plate can move along the through hole in the direction of the second mounting groove to the first position.

[0014] A further solution is: the multiple crimping tool also includes a positioning column; the positioning column is arranged on the upper end surface of the support column; the positioning column is used to fit in the valve seat and the first installation groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The secondary press-fitting process is used to slightly deform the lower end of the valve body and form an abutment portion on the lower end surface of the valve seat, thereby enhancing the connection strength between the valve seat and the valve body and reducing the risk of the valve seat falling off from the valve body during long-term use of the EGR valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a multiple crimping tool for EGR valve assembly in this embodiment;

[0018] Figure 2 This is a structural schematic diagram of an EGR valve assembly in this embodiment when a valve body is placed on a multiple crimping tool;

[0019] Figure 3 This is a structural schematic diagram of an EGR valve assembly in this embodiment, in which a valve body is placed on a multiple crimping tool, and a support column is in a first state;

[0020] Figure 4 for Figure 3 The enlarged structural diagram at A in the middle;

[0021] Figure 5 It is a structural schematic diagram of an EGR valve assembly in this embodiment, in which a valve body is placed on a multiple crimping tool, and the support column is in a second state;

[0022] Figure 6 This is a structural schematic diagram of an EGR valve assembly in this embodiment, in which a valve body is placed on a multiple crimping tool and the valve body is attached to the upper end of the base;

[0023] Figure 7 for Figure 6 Schematic diagram of the enlarged structure at point B.

[0024] Marks and corresponding parts names in the attached drawings:

[0025] 1-valve seat; 2-valve body; 3-first mounting groove; 4-base; 5-second mounting groove; 6-support column;

[0026] 7-switching mechanism; 71-telescopic member; 72-limiting plate;

[0027] 8-accommodating groove; 9-riveting column; 10-elastic member; 11-through hole; 12-limiting groove; 13-limiting block; 14-positioning column;

[0028] 15- Gap. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Embodiment 1: This embodiment provides a multiple crimping tool for EGR valve assembly, such as Figure 1-Figure 7 As shown, the multiple crimping tool is used to assemble the valve seat 1 in the first installation groove 3 on the valve body 2. The multiple crimping tool includes a base 4, a support column 6 and a switching mechanism 7. The upper end surface of the base 4 is provided with a second installation groove 5; the support column 6 is arranged in the second installation groove 5; when the support column 6 is in the first state, the distance between the upper end surface of the support column 6 and the upper end surface of the base 4 is greater than or equal to the difference between the depth of the first installation groove 3 and the height of the valve seat 1; the support column 6 is used to stack the valve seat 1 and the valve body 2 in sequence, and the support The column 6 is also used to press the valve seat 1 into the first mounting groove 3 when the valve body 2 moves downward; when the support column 6 is in the second state, the support column 6 can move along the notch of the second mounting groove 5 toward the bottom of the second mounting groove 5 until the valve body 2 is attached to the upper end surface of the base 4; wherein the base 4 is used to bend the lower end of the valve body 2 toward the direction of the first mounting groove 3 when the valve body 2 moves downward; the switching mechanism 7 is used to switch the support column 6 from the first state to the second state when the valve seat 1 is adapted in the first mounting groove 3.

[0031] Exemplarily, during implementation, a second mounting groove 5 is formed on the base 4 , and the second mounting groove 5 extends from the upper end surface of the base 4 toward the lower end surface of the base 4 .

[0032] The support column 6 is disposed in the second installation groove 5 , and the support column 6 can move along the direction from the groove opening of the second installation groove 5 to the groove bottom of the second installation groove 5 / along the direction from the groove bottom of the second installation groove 5 to the groove opening of the second installation groove 5 .

[0033] The switching mechanism 7 is disposed on the base 4 .

[0034] When in use, during the initial press-fitting process: when the valve seat 1 and the valve body 2 need to be installed, first place the EGR valve assembly under the press-fitting equipment using a multiple crimping tool, and move the support column 6 along the bottom of the second mounting groove 5 toward the notch of the second mounting groove 5. When the distance between the upper end face of the support column 6 and the upper end face of the base 4 is greater than or equal to the difference between the depth of the first mounting groove 3 and the height of the valve seat 1, operate the switching mechanism 7 to make the switching mechanism 7 abut against the support column 6. At this time, the distance between the upper end face of the support column 6 and the upper end face of the base 4 is always greater than or equal to the difference between the depth of the first mounting groove 3 and the height of the valve seat 1, and the support column 6 is in the first state. Next, place the valve seat 1 on the upper end face of the support column 6, place the valve body 2 above the valve seat 1, and align the notch of the first mounting groove 3 on the lower end face of the valve seat 1 and the valve body 2. At this time, the first operation of the press-fitting device is to move downward. The press-fitting device first contacts the upper end of the valve body 2, and gradually drives the valve body 2 to move downward until the valve seat 1 is pressed into the first installation groove 3 at the lower end of the valve body 2 under the support force of the support column 6 and the extrusion force of the valve body 2. It is expected to achieve the purpose of installing the valve seat 1 in the first installation groove 3, performing initial positioning, and then facilitating the secondary press-fitting of the press-fitting device. At the same time, the distance between the upper end face of the support column 6 and the upper end face of the base 4 is greater than or equal to the difference between the depth of the first installation groove 3 and the height of the valve seat 1. When the support force of the support column 6 squeezes the valve seat 1 into the first installation groove 3, it is expected to reduce the risk of contact between the lower end face of the valve body 2 and the base 4, thereby reducing the risk of the valve seat 1 not being installed properly at the beginning.

[0035] Secondly, after the valve seat 1 is pressed against the first mounting groove 3 at the lower end of the valve body 2, the pressing device is operated to move upward to a suitable position, and the switching mechanism 7 is operated to release the abutment state between the switching mechanism 7 and the support column 6. At this time, the support column 6 is in the second state, and the support column 6 can move along the notch of the second mounting groove 5 toward the bottom of the second mounting groove 5.

[0036] During the secondary press-fitting process: the press-fitting equipment moves downward for the second operation. The press-fitting equipment first contacts the upper end of the valve body 2, and gradually drives the valve body 2, valve seat 1, and support seat to move downward synchronously until the lower end face of the valve body 2 fits with the upper end face of the base 4. As the press-fitting equipment continues to move downward, the lower end of the valve body 2 bends toward the first mounting groove 3 due to the support force of the base 4 and the extrusion force of the press-fitting equipment, and forms an abutment portion on the lower end face of the valve seat 1. The secondary press-fitting process is used to slightly deform the lower end of the valve body 2 and form an abutment portion on the lower end face of the valve seat 1. It is expected to enhance the connection strength between the valve seat 1 and the valve body 2, thereby reducing the risk of the valve seat 1 falling off from the valve body 2 during long-term use of the EGR valve.

[0037] An optional implementation method, during the initial press-fitting process: when the abutment state between the switching mechanism 7 and the support column 6 is released, the support column 6 can move along the notch of the second mounting groove 5 toward the bottom of the second mounting groove 5, and the support column 6 is in the second state. At this time, the support column 6 moves along the notch of the second mounting groove 5 toward the bottom of the second mounting groove 5 until the lower end surface of the valve body 2 is in contact with the upper end surface of the base 4. During the secondary press-fitting process: the press-fitting device is operated downward for the second time, and the press-fitting device first contacts with the upper end surface of the valve body 2. As the press-fitting device continues to move downward, the support force of the valve body 2 on the base 4 and the extrusion force of the press-fitting device act, and the lower end of the valve body 2 bends in the direction close to the first mounting groove 3, and forms an abutment portion on the lower end surface of the valve seat 1. Through this operation, the secondary press-fitting process can also be achieved, so that the lower end of the valve body 2 is slightly deformed, and an abutment portion is formed on the lower end surface of the valve seat 1. This is in the hope of increasing the connection strength between the valve seat 1 and the valve body 2 , thereby reducing the risk of the valve seat 1 falling off from the valve body 2 during long-term use of the EGR valve.

[0038] Embodiment 2: In order to facilitate the formation of abutment portion at the lower end of the valve body 2 that fits the lower end surface of the valve seat 1. Based on the above embodiment 1, in this embodiment, Figure 4 As shown, the depth of the first mounting groove 3 is greater than the height of the valve seat 1 .

[0039] Exemplarily, during implementation, the depth of the first mounting groove 3 is greater than the height of the valve seat 1 .

[0040] During use, during the initial press-fitting process: when the press-fitting device is operated to move downward for the first time, the valve seat 1 is pressed into the first mounting groove 3 at the lower end of the valve body 2, and the valve seat 1 fits against the bottom of the first mounting groove 3. At this time, because the depth of the first mounting groove 3 is greater than the height of the valve seat 1, there is a gap between the lower end face of the valve body 2 and the lower end face of the valve seat 1. In other words, the lower end of the side wall of the first mounting groove 3 is not filled with the valve seat 1. In this state, when the lower end face of the valve body 2 fits against the upper end face of the base 4, there is a gap between the lower end face of the valve seat 1 and the upper end face of the base 4 (the lower end face of the valve body 2). During the secondary press-fitting process: when the second operating press-fitting device continues to move downward, the lower end of the side wall of the first mounting groove 3 that is not filled with the valve seat 1 can be better bent toward the axial direction of the first mounting groove 3. The purpose is to facilitate forming an abutment portion on the lower end surface of the valve seat 1, thereby enhancing the connection strength between the valve seat 1 and the valve body 2, so as to reduce the risk of the valve seat 1 falling off from the valve body 2 during long-term use of the EGR valve.

[0041] Embodiment 3: In order to further achieve the purpose of forming a contact portion at the lower end of the valve body 2 that fits the lower end surface of the valve seat 1. Based on the above embodiment 2, in this embodiment, Figure 4 or Figure 5 As shown, the inner diameter of the second mounting groove 5 is smaller than the inner diameter of the first mounting groove 3 .

[0042] Exemplarily, in the implementation process, the inner diameter of the second installation groove 5 is smaller than the inner diameter of the first installation groove 3. In other words, the inner diameter of the first installation groove 3 is larger than the outer diameter of the support column 6.

[0043] During the initial press-fitting process when in use: the first operation of the press-fitting device is to move downward, so that the valve seat 1 is pressed into the first mounting groove 3 at the lower end of the valve body 2, and the valve seat 1 fits the bottom of the first mounting groove 3. At this time, because the depth of the first mounting groove 3 is greater than the height of the valve seat 1, there is a gap between the lower end face of the valve body 2 and the lower end face of the valve seat 1. In other words, the lower end of the side wall of the first mounting groove 3 is not filled by the valve seat 1. In this state, when the lower end face of the valve body 2 fits the upper end face of the base 4, there is a gap between the lower end face of the valve seat 1 and the upper end face of the base 4 (the lower end face of the valve body 2). At this time, because the inner diameter of the second mounting groove 5 is smaller than the inner diameter of the first mounting groove 3 (the inner diameter of the first mounting groove 3 is larger than the outer diameter of the support column 6), a gap 15 is formed between the lower end of the side wall of the first mounting groove 3 and the side wall of the support column 6. During the secondary press-fitting process: when the second operation press-fitting device continues to move downward, the lower end of the side wall of the first installation groove 3 that is not filled by the valve seat 1 can be better bent toward the axis direction of the first installation groove 3, and an abutment portion is formed in the gap 15 between the lower end of the side wall of the first installation groove 3 and the side wall of the support column 6. It is expected to further facilitate the formation of the abutment portion on the lower end surface of the valve seat 1, thereby enhancing the connection strength between the valve seat 1 and the valve body 2, so as to reduce the risk of the valve seat 1 falling off from the valve body 2 during the long-term use of the EGR valve.

[0044] Embodiment 4: Based on the above embodiment 2 or embodiment 3, in this embodiment, as Figure 4 or Figure 5 As shown, the side wall of the support column 6 gradually moves away from the axis of the support column 6 along the direction from the upper end of the support column 6 to the lower end of the support column 6; the side wall of the support column 6 is used to form a receiving groove 8 with the lower end surface of the valve seat 1; the receiving groove 8 is used to form an abutment portion on the side wall of the first mounting groove 3 when the lower end of the valve body 2 bends in the direction of the first mounting groove 3; wherein, the abutment portion is used to fit against the lower end surface of the valve seat 1.

[0045] Exemplarily, during the implementation process, the side wall of the support column 6 gradually moves away from the axis of the support column 6 along the direction from the upper end of the support column 6 to the lower end of the support seat.

[0046] During use, after the valve seat 1 is pressed into the first mounting groove 3 at the lower end of the valve body 2, the valve seat 1 is attached to the support column 6. At this time, a receiving groove 8 is formed between the side wall of the support column 6 and the lower end surface of the valve seat 1.

[0047] In an optional implementation, during the secondary press-fitting process: when the second operation press-fitting device continues to move downward, the lower end of the side wall of the first installation groove 3 that is not filled by the valve seat 1 can be better bent toward the axis direction of the first installation groove 3, and form an abutment portion in the accommodating groove 8. It is expected to facilitate the formation of an abutment portion on the lower end surface of the valve seat 1, thereby enhancing the connection strength between the valve seat 1 and the valve body 2, so as to reduce the risk of the valve seat 1 falling off from the valve body 2 during the long-term use of the EGR valve.

[0048] Another optional implementation is that during the secondary press-fitting process: when the second operation press-fitting device continues to move downward, the lower end of the side wall of the first installation groove 3 that is not filled by the valve seat 1 can be better bent toward the axis direction of the first installation groove 3, and abutment portions are formed in the accommodating groove 8 and in the gap 15 between the lower end of the side wall of the first installation groove 3 and the side wall of the support column 6. It is expected to form multiple abutment portions to increase the thickness of the abutment portions, thereby enhancing the connection strength between the valve seat 1 and the valve body 2, so as to reduce the risk of the valve seat 1 falling off from the valve body 2 during the long-term use of the EGR valve.

[0049] Embodiment 5: Based on the above embodiment 4, in this embodiment, Figure 1 As shown, the multiple crimping tooling also includes a rivet column 9; the rivet column 9 is arranged on the upper end surface of the base 4; the upper end surface of the rivet column 9 is used to fit with the valve body 2; the number of the rivet columns 9 is set to be several, and the several rivet columns 9 are evenly arranged around the second mounting groove 5.

[0050] Exemplarily, during the implementation, the multiple crimping tool further includes a riveting column 9. The riveting column 9 is connected to the upper end surface of the base 4 by welding, screwing or integral molding, and the riveting column 9 is attached to the side wall of the support column 6. There are a plurality of riveting columns 9, and the plurality of riveting columns 9 are evenly arranged around the axis of the second mounting groove 5.

[0051] During use, during the secondary press-fitting process: when the valve body 2 moves downward, the lower end face of the valve body 2 first fits against the upper end face of the riveting column 9. As the press-fitting device drives the valve body 2 to continue to move downward, the portion of the lower end of the valve body 2 that is not filled by the valve seat 1 bends toward the axis of the first mounting groove 3 under the extrusion of the press-fitting device and the riveting column 9, and forms multiple abutments that are evenly distributed around the axis of the first mounting groove 3 and are spaced apart in the accommodating groove 8 (the accommodating groove 8, and the gap 15 between the lower end of the side wall of the first mounting groove 3 and the side wall of the support column 6). The abutments that are spaced apart can be subjected to independent stresses during use, thereby reducing stress concentration. It is hoped that when some abutments are damaged, the remaining abutments can still work normally, thereby reducing the risk of the valve seat 1 falling off from the valve body 2 during long-term use of the EGR valve.

[0052] Embodiment 6: In order to achieve the purpose of driving the support column 6 to move along the bottom of the second installation groove 5 toward the groove opening of the second installation groove 5. Based on the above embodiment 1, in this embodiment, Figure 3 or Figure 6 As shown, the multiple crimping tool also includes an elastic member 10; the elastic member 10 is arranged at the bottom of the second mounting groove 5; the elastic member 10 extends along the bottom of the second mounting groove 5 toward the groove opening of the second mounting groove 5, and the upper end of the elastic member 10 is connected to the support column 6.

[0053] Exemplarily, during the implementation process, the multiple crimping tool further includes an elastic member 10. The elastic member 10 can be a spring, rubber or other elastic structure. The elastic member 10 is arranged in the receiving groove 8, and the elastic member 10 extends along the bottom of the receiving groove 8 toward the notch of the receiving groove 8, and one end of the elastic member 10 is connected to the bottom of the second mounting groove 5 by welding, screwing, etc., and the other end of the elastic member 10 is connected to the lower end of the support column 6 by welding, screwing, etc.

[0054] During use, during the initial press-fitting process: when the abutment between the switching mechanism 7 and the support column 6 is released, the support column 6 can move along the notch of the second mounting groove 5 toward the bottom of the second mounting groove 5, but supported by the elastic force of the elastic member 10, the support column 6 will not slide downward under the action of its own weight. During the secondary press-fitting process: when the press-fitting device moves downward for the second time, the press-fitting device will first fit on the upper end face of the valve body 2. As the press-fitting device continues to move downward, the press-fitting device squeezes the valve body 2 downward, and the elastic member 10 is gradually compressed. The valve body 2, the valve seat 1, and the support seat move downward synchronously until the lower end face of the valve body 2 fits with the upper end face of the base 4. It is hoped that the purpose of reducing the risk of the valve body 2 and the valve seat 1 being displaced due to the downward movement of the support column 6 under its own gravity when the abutment between the switching mechanism 7 and the support column 6 is released is achieved. When the press-fitting device is operated to move upward, the elastic member 10 gradually recovers and drives the support column 6, the valve body 2, and the valve seat 1 to move upward synchronously until the distance between the upper end surface of the support column 6 and the upper end surface of the base 4 is greater than or equal to the difference between the depth of the first installation groove 3 and the height of the valve seat 1. It is expected to achieve the purpose of facilitating the automatic reset of the support column 6 and thus improving the convenience of operation.

[0055] Embodiment 7: Based on the above embodiment 1 or embodiment 6, in this embodiment, Figure 1As shown, a through hole 11 is formed at the lower end of the side wall of the base 4; the through hole 11 is connected to the second mounting groove 5; the switching mechanism 7 includes a telescopic member 71 and a limiting plate 72; the limiting plate 72 is inserted into the through hole 11; the telescopic member 71 is connected to the end of the limiting plate 72 away from the second mounting groove 5; when the telescopic member 71 drives the limiting plate 72 to move to the first position along the through hole 11 toward the second mounting groove 5, the support column 6 is in the first state; wherein, when the limiting plate 72 is in the first position, the There is an overlapping area between the projection of the limiting plate 72 on the bottom of the second mounting groove 5 and the projection of the support column 6 on the bottom of the second mounting groove 5, and the limiting plate 72 is attached to the lower end surface of the support column 6; when the telescopic member 71 drives the limiting plate 72 to move to the second position along the second mounting groove 5 toward the direction of the through hole 11, the support column 6 is in the second state; wherein, when the limiting plate 72 is in the second position, there is no overlapping area between the projection of the limiting plate 72 on the bottom of the second mounting groove 5 and the projection of the support column 6 on the bottom of the second mounting groove 5.

[0056] Exemplarily, during implementation, the switching mechanism 7 includes a telescopic member 71 and a limiting plate 72 .

[0057] The telescopic member 71 can be a telescopic structure such as an electric telescopic rod, a hydraulic telescopic rod, or a cylinder. The telescopic member 71 is connected to the side wall of the base 4 by welding, screwing, etc., and the telescopic end of the telescopic member 71 is located on the side of the telescopic member 71 close to the base 4.

[0058] The limiting plate 72 is connected to the telescopic end of the telescopic member 71 by welding, screwing, etc., so that the limiting plate 72 can move toward or away from the base 4 under the drive of the telescopic member 71.

[0059] A through hole 11 is provided at the lower end of the side wall of the base 4, and the through hole 11 is connected to the second mounting groove 5, and the through hole 11 corresponds to the limit plate 72, so that the limit plate 72 can be driven by the telescopic member 71 to approach the second mounting groove 5 along the through hole 11 toward the second mounting groove 5, or move away from the second mounting groove 5 along the direction of the through hole 11 toward the second mounting groove 5.

[0060] When in use, during the initial press-fitting process: when the support column 6 moves to the point where the distance between the upper end face of the support column 6 and the upper end face of the base 4 is greater than or equal to the difference between the depth of the first mounting groove 3 on the valve body 2 and the height of the valve seat 1, operate the telescopic member 71 to drive the limit plate 72 to move along the through hole 11 in the direction of the second mounting groove 5 to just below the support column 6 (i.e., there is an overlap between the projection of the limit plate 72 on the bottom of the second mounting groove 5 and the projection of the support column 6 on the bottom of the second mounting groove 5), and abut against the lower end face of the support column 6. At this time, the limit plate 72 is in the first position, the distance between the upper end face of the support column 6 and the upper end face of the base 4 is always greater than or equal to the difference between the depth of the first mounting groove 3 and the height of the valve seat 1, and the support column 6 is in the first state. It is hoped that the risk of the support column 6 sliding down due to gravity or other factors, which may cause the valve seat 1 to not be pressed into place, can be reduced.

[0061] After the valve seat 1 is pressed against the first mounting groove 3 at the lower end of the valve body 2, the pressing device is operated to move upward to a suitable position, and the telescopic member 71 is operated to drive the limit plate 72 to move along the second mounting groove 5 in the direction of the through hole 11 to the lower side of the support column 6 (that is, there is no overlap between the projection of the limit plate 72 on the bottom of the second mounting groove 5 and the projection of the support column 6 on the bottom of the second mounting groove 5). At this time, the limit plate 72 is in the second position, and the abutment between the limit plate 72 and the support column 6 is released, so that the support column 6 can move along the notch of the second mounting groove 5 toward the bottom of the second mounting groove 5 as needed. At this time, the support column 6 is in the second state. Through the cooperation of the telescopic member 71 and the limit plate 72, it is expected to achieve the purpose of accurately controlling the state conversion of the support column 6.

[0062] Embodiment 8: Based on the above embodiment 7, in this embodiment, Figure 3 or Figure 6 As shown, a limiting groove 12 is provided at the lower end of the side wall of the second mounting groove 5; a limiting block 13 is provided at the lower end of the side wall of the support column 6; the limiting block 13 is slidably provided in the limiting groove 12; wherein, when the limiting block 13 slides upward to the maximum position, the upper end surface of the limiting block 13 abuts against the upper groove bottom of the limiting groove 12, and the limiting plate 72 can be moved along the through hole 11 in the direction of the second mounting groove 5 to the first position.

[0063] Exemplarily, in the implementation process, a limiting groove 12 is provided at the lower end of the side wall of the second mounting groove 5, and a limiting block 13 is provided at the lower end of the side wall of the support column 6 by welding, screwing or integral molding, and the limiting block 13 is slidably provided in the limiting groove 12. When the support column 6 moves upward / downward along the second mounting groove 5, the limiting block 13 moves upward / downward synchronously with the limiting groove 12.

[0064] During use, when the limit block 13 moves upward along the limit slot 12 to the maximum position, the upper end surface of the limit block 13 abuts against the upper groove bottom of the limit slot 12. At this time, the limit plate 72 can be driven by the telescopic member 71, and can move along the through hole 11 in the direction of the second mounting slot 5 to the right below the support column 6 (that is, there is an overlap between the projection of the limit plate 72 on the groove bottom of the second mounting slot 5 and the projection of the support column 6 on the groove bottom of the second mounting slot 5), and abut against the lower end surface of the support column 6, that is, the first position of the limit plate 72. Through the cooperation of the limit slot 12 and the limit block 13, it is expected that the upward sliding position of the support column 6 can be accurately controlled, thereby ensuring that the support column 6 can accurately reach the predetermined position each time it moves upward, so as to improve the accuracy and consistency of the assembly process.

[0065] Embodiment 9: Based on the above embodiment 1, in this embodiment, Figure 3 or Figure 6 As shown, the multiple crimping tool further includes a positioning column 14 ; the positioning column 14 is arranged on the upper end surface of the support column 6 ; the positioning column 14 is used to fit in the valve seat 1 and the first mounting groove 3 .

[0066] Exemplarily, during the implementation, the multiple crimping tool further includes a positioning column 14. The positioning column 14 is connected to the upper end surface of the support column 6 by welding, screwing or integral molding, and the positioning column 14 is used to fit in the valve seat 1 and the first mounting groove 3, that is, the size and shape of the positioning column 14 can be closely matched with the corresponding parts in the valve seat 1 and the first mounting groove 3.

[0067] When in use, during the initial press-fitting process: first, the valve seat 1 is sleeved on the positioning post 14 from the upper end of the positioning post 14, and the valve seat 1 is fitted on the upper end surface of the support post 6. Then, the valve body 2 is sleeved on the positioning post 14 from the upper side of the positioning post 14 through the first installation groove 3, so that the valve body 2 is located on the valve seat 1, and the notch of the first installation groove 3 on the lower end surface of the valve body 2 is aligned with the valve seat 1. It is expected to achieve the purpose of reducing the risk of deviation between the first installation groove 3 of the valve body 2 and the valve body 2.

[0068] When the press-fitting device is operated downward for the first time, the valve body 2 is driven to move downward along the positioning column 14 from above the valve body 2, so that the valve seat 1 is pressed into the first installation groove 3 at the lower end of the valve body 2 under the support force of the support column 6 and the extrusion force of the valve body 2. In this process, the positioning column 14 limits the valve body 2 and the valve seat 1 laterally, so as to achieve the purpose of improving the assembly accuracy between the valve seat 1 and the valve body 2.

[0069] During the secondary press-fitting process: when the valve body 2 and the valve seat 1 move downward, the positioning column 14 limits the valve body 2 and the valve seat 1 laterally, so as to improve the uniformity of each bending part when the lower end of the valve body 2 bends toward the first installation groove 3.

[0070] In a preferred embodiment, in order to facilitate the sleeve arrangement of the valve seat 1 and the valve body 2 on the positioning column 14, the cross-sectional area of ​​the positioning column 14 gradually increases from top to bottom.

[0071] The working process of a multiple crimping tool for EGR valve assembly in this embodiment is as follows:

[0072] Initial press-fitting process: the elastic member 10 is in a compressed state / initial state, and the limit block 13 is in the maximum upward position under the elastic force of the elastic member 10. At this time, the upper end surface of the limit block 13 is in contact with the upper groove bottom of the limit groove 12, and the distance between the upper end surface of the support column 6 and the upper end surface of the riveting column 9 is greater than or equal to the difference between the depth of the first installation groove 3 and the height of the valve seat 1.

[0073] The telescopic member 71 is operated to drive the limiting plate 72 to move along the through hole 11 toward the second mounting groove 5 until the limiting plate 72 moves to the right below the support column 6 (i.e., there is an overlap between the projection of the limiting plate 72 on the bottom of the second mounting groove 5 and the projection of the support column 6 on the bottom of the second mounting groove 5), and abuts against the lower end surface of the support column 6. At this time, the limiting plate 72 is in the first position, and the support column 6 is in the first state.

[0074] The upper end of the valve seat 1 is mounted on the positioning column 14 from the upper end of the positioning column 14, and the valve seat 1 is fitted on the upper end surface of the support column 6. The upper end surface of the valve body 2 is mounted on the positioning column 14 from the upper end surface of the positioning column 14, and the notch of the first mounting groove 3 on the lower end surface of the valve body 2 is aligned with the valve seat 1.

[0075] The press-fitting device is operated for the first time, and moves downward from the initial position for the first time. During the first downward movement of the press-fitting device, the press-fitting device first fits against the upper end of the valve body 2. As the press-fitting device continues to move downward, the valve seat 1 is gradually squeezed into the first installation groove 3 on the lower end surface of the valve body 2 until the valve seat 1 fits against the bottom of the first installation groove 3.

[0076] When the press-fitting device presses the valve seat 1 into the first mounting groove 3 on the valve body 2 and fits against the bottom of the first mounting groove 3 , the press-fitting device moves upward to the initial position.

[0077] Secondary press-fitting process: Operate the telescopic member 71 to drive the limit plate 72 to move along the second mounting groove 5 in the direction of the through hole 11, until the limit plate 72 moves to the lower side of the support column 6 (i.e., there is no overlap between the projection of the limit plate 72 on the bottom of the second mounting groove 5 and the projection of the support column 6 on the bottom of the second mounting groove 5). At this time, the limit plate 72 is in the second position, the abutment between the limit plate 72 and the support column 6 is released, and the support column 6 can move along the notch of the second mounting groove 5 in the direction of the notch of the second mounting groove 5, and the support column 6 is in the second state.

[0078] The second operation of the press-fitting device causes the press-fitting device to move downward from the initial position for the second time. During the second downward movement of the press-fitting device, the press-fitting device first fits against the upper end of the valve body 2. As the press-fitting device continues to move downward, the valve seat 1, the valve body 2, and the support portion move downward synchronously, and the elastic member 10 is gradually compressed until the lower end surface of the valve body 2 fits against the upper end surface of the riveted column 9. At this time, the press-fitting device continues to move downward, so that the lower end of the valve body 2, which is not filled by the valve seat 1, is bent toward the axis of the first mounting groove 3 under the extrusion of the press-fitting device and the riveted column 9, and multiple abutment portions are formed that are evenly distributed around the axis of the first mounting groove 3 and spaced apart in the accommodating groove 8 and the gap 15 between the lower end of the side wall of the first mounting groove 3 and the side wall of the support column 6.

[0079] After the abutment portion is formed, the press-fitting device moves upward to the initial position. During this process, the elastic member 10 gradually stretches and drives the support column 6 (the valve seat 1 and the valve body 2 move synchronously) to move along the bottom of the second installation groove 5 toward the notch of the second installation groove 5 until the upper end surface of the limit block 13 is attached to the upper bottom of the limit groove 12.

[0080] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and improvements may be made to the components and / or layout of the subject combination layout. In addition to variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A multiple crimping tool for EGR valve assembly, characterized in that: The multiple crimping tool is used to assemble the valve seat (1) into the first mounting groove (3) on the valve body (2), and the multiple crimping tool comprises: A base (4), wherein the upper end surface of the base (4) is provided with a second mounting groove (5); A support column (6), wherein the support column (6) is arranged in the second mounting groove (5); When the support column (6) is in the first state, the distance between the upper end surface of the support column (6) and the upper end surface of the base (4) is greater than or equal to the difference between the depth of the first mounting groove (3) and the height of the valve seat (1); the support column (6) is used to stack the valve seat (1) and the valve body (2) in sequence, and the support column (6) is also used to press the valve seat (1) into the first mounting groove (3) when the valve body (2) moves downward; When the support column (6) is in the second state, the support column (6) can move along the notch of the second installation groove (5) toward the bottom of the second installation groove (5) until the valve body (2) is in contact with the upper end surface of the base (4); wherein the base (4) is used to bend the lower end of the valve body (2) toward the direction of the first installation groove (3) when the valve body (2) moves downward; A switching mechanism (7), wherein the switching mechanism (7) is used to switch the support column (6) from a first state to a second state when the valve seat (1) is adapted in the first installation groove (3).

2. The multiple crimping tool according to claim 1, characterized in that: The depth of the first mounting groove (3) is greater than the height of the valve seat (1).

3. The multiple crimping tool according to claim 2, characterized in that: The inner diameter of the second mounting groove (5) is smaller than the inner diameter of the first mounting groove (3).

4. The multiple crimping tool according to claim 2 or 3, characterized in that: The side wall of the support column (6) gradually moves away from the axis of the support column (6) along the direction from the upper end of the support column (6) to the lower end of the support column (6); The side wall of the support column (6) is used to form a receiving groove (8) with the lower end surface of the valve seat (1); The accommodating groove (8) is used to form an abutment portion on the side wall of the first installation groove (3) when the lower end of the valve body (2) is bent in the direction of the first installation groove (3); Wherein, the abutment portion is used to fit against the lower end surface of the valve seat (1).

5. The multiple crimping tool according to claim 4, characterized in that: Also includes a riveting post (9); The riveting column (9) is arranged on the upper end surface of the base (4); The upper end surface of the riveted column (9) is used to fit with the valve body (2); The number of the riveted columns (9) is set to be a plurality, and the plurality of the riveted columns (9) are evenly arranged around the second mounting groove (5).

6. The multiple crimping tool according to claim 1, characterized in that: Also includes an elastic member (10); The elastic member (10) is arranged at the bottom of the second mounting groove (5); The elastic member (10) extends along the bottom of the second mounting groove (5) towards the groove opening of the second mounting groove (5), and the upper end of the elastic member (10) is connected to the support column (6).

7. The multiple crimping tool according to claim 1 or 6, characterized in that: A through hole (11) is formed at the lower end of the side wall of the base (4); The through hole (11) is in communication with the second mounting groove (5); The switching mechanism (7) comprises a telescopic member (71) and a limiting plate (72); The limiting plate (72) is inserted into the through hole (11); The telescopic member (71) is connected to an end of the limiting plate (72) away from the second mounting groove (5); When the telescopic member (71) drives the limiting plate (72) to move to the first position along the through hole (11) in the direction of the second mounting groove (5), the support column (6) is in the first state; wherein, when the limiting plate (72) is in the first position, there is an overlapping area between the projection of the limiting plate (72) on the bottom of the second mounting groove (5) and the projection of the support column (6) on the bottom of the second mounting groove (5), and the limiting plate (72) is attached to the lower end surface of the support column (6); When the telescopic member (71) drives the limiting plate (72) to move to a second position along the second mounting groove (5) in the direction of the through hole (11), the support column (6) is in a second state; wherein, when the limiting plate (72) is in the second position, there is no overlapping area between the projection of the limiting plate (72) on the bottom of the second mounting groove (5) and the projection of the support column (6) on the bottom of the second mounting groove (5).

8. The multiple crimping tool according to claim 7, characterized in that: A limiting groove (12) is provided at the lower end of the side wall of the second installation groove (5); A limiting block (13) is provided at the lower end of the side wall of the support column (6); The limiting block (13) is slidably disposed in the limiting groove (12); When the limit block (13) slides upward to the maximum position, the upper end surface of the limit block (13) abuts against the upper bottom of the limit groove (12), and the limit plate (72) can move along the through hole (11) in the direction of the second mounting groove (5) to the first position.

9. The multiple crimping tool according to claim 1, characterized in that: Also includes a positioning column (14); The positioning column (14) is arranged on the upper end surface of the supporting column (6); The positioning column (14) is used to fit in the valve seat (1) and the first installation groove (3).

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