An automated pressing and assembly platform for an engine exhaust butterfly valve

Abstract

The present invention discloses an automatic press-fitting and assembling platform for an engine exhaust butterfly valve, which mainly relates to the technical field of combined machining. It includes a pedestal, on which clamping units are symmetrically arranged on the left and right. The clamping unit includes a lifting table with a lifting stroke, and a clamping member with a telescopic stroke is installed on the lifting table, so that the valve seat is clamped between the two clamping members in a state where its valve stem hole is centered; a positioning tray and a shaft groove with corresponding heights are also fixed on the pedestal. The diameter of the positioning tray is not greater than the diameter of the valve disc. An arc groove adapted to the middle part of the valve disc is centered on the top surface of the positioning tray. The positioning tray and the arc groove are both centered relative to the clamping unit; the shaft groove is arranged in the same direction as the arc groove, one end of the shaft groove is close to the side of the positioning tray, and a push block is arranged in the shaft groove, and the push block has a linear stroke along the length direction of the shaft groove. The beneficial effect of the present invention is that it can achieve mechanical combined alignment and assembly, thereby improving the assembly accuracy and production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of combined processing, and specifically to an automated press-fitting and assembly platform for an engine exhaust butterfly valve. Background Art

[0002] In the production process of an engine exhaust butterfly valve, the precise alignment step of the valve stem with the disc and the valve seat has a crucial impact on the performance, quality, and reliability of the entire product. This link is not only the key guarantee for the sealing performance but also directly affects the service life, operating flexibility, product quality, and safety of the valve.

[0003] Firstly, the sealing performance is the core function of the butterfly valve, and the precise alignment of the valve stem with the disc and the valve seat is the basis for ensuring the sealing performance. If the alignment is inaccurate, it may lead to poor contact of the sealing surface and leakage problems. Secondly, precise alignment can effectively extend the service life of the valve. Inaccurate alignment will cause increased friction between components, especially at the connection between the valve stem and the disc, and fatigue fracture or deformation is likely to occur after long-term use. In addition, the alignment accuracy of the valve stem with the disc and the valve seat also directly affects the operating flexibility of the valve. It may increase the torque, resulting in increased energy loss of the engine.

[0004] In the production process, this step includes the installation of the bushing, the assembly of the disc and the valve seat, the assembly of the valve stem, etc. Since the operation of the valve stem passing through the disc and the valve seat needs to be completed in a limited space and also needs to cooperate with the positioning and installation of multiple components, and the process involves the collaborative assembly of multiple components, it is difficult to achieve the flexibility of space operation for automated equipment. Therefore, it usually relies on manual work. Some enterprises have tried to introduce automated equipment, but mainly focus on the processing and preliminary assembly stages of components. The key step of the valve stem passing through still relies on manual work. However, manual assembly is difficult to ensure the accuracy and consistency of each assembly, and problems such as poor sealing or inflexible rotation are likely to occur. It is difficult to stably control and guarantee the product quality. The production efficiency is also relatively low, the labor cost is high, and it is more restricted by human factors and there are more uncertain factors, becoming the bottleneck link restricting production. Summary of the Invention

[0005] The purpose of the present invention is to provide an automated press-fitting and assembly platform for an engine exhaust butterfly valve, which can achieve mechanical combined alignment and assembly, thereby improving the assembly accuracy and production efficiency.

[0006] To achieve the above object, the present invention is realized through the following technical solutions:

[0007] An automatic press-fit assembly platform for an engine exhaust butterfly valve comprises a pedestal, on which clamping units are symmetrically arranged, the clamping units comprise a lifting platform with a lifting stroke, on which a clamping member with a telescopic stroke is installed, and two clamping members are brought together or separated based on their respective telescopic strokes, so that the valve seat is clamped between the two clamping members in a state where the valve stem hole is centered;

[0008] A positioning tray and an axis groove of corresponding heights are also fixed on the base, the diameter of the positioning tray is not larger than the diameter of the valve plate, an arc groove adapted to the middle of the valve plate is centrally provided on the top surface of the positioning tray, and the positioning tray and the arc groove are centrally arranged relative to the clamping unit; the axis groove and the arc groove are arranged in the same direction, one end of the axis groove is close to the side of the positioning tray, a push block is provided in the axis groove, and the push block has a linear stroke along the length direction of the axis groove.

[0009] A guide ring is provided on the circumference of the positioning tray, the inner ring of the guide ring is adapted to the circumference of the valve plate, a trumpet-shaped guide opening is provided on the top side of the inner wall of the guide ring, a telescopic rod is provided on the circumference of the guide ring, a telescopic tube is provided at the lower part of the telescopic rod which is slidably and telescopically connected to the telescopic rod up and down, and a spring member is provided between the telescopic rod and the telescopic tube to keep the two apart.

[0010] An arcuate surface corresponding to the periphery of the valve seat is provided on the inner side adjacent to the clamping member, and the arcuate surface is set to an arc of 120 degrees. An annular baffle plate extending perpendicular to the arcuate surface and horizontally is provided on the top side of the clamping member, and the bottom surface of the annular baffle plate is used to contact the top surface of the valve seat.

[0011] The width of the shaft groove is adapted to the diameter of the valve stem, and a guide sleeve which is cocircular with the bottom of the shaft groove is provided at one end of the shaft groove close to the clamping position; a slide groove which passes through the shaft groove is provided in the center of the bottom of the shaft groove, and a slide bar which slides and cooperates with the shaft groove is provided in the slide groove; the push block is cylindrical and fixed on the top of the slide bar; a pressing cylinder body fixed on a base is provided below the shaft groove, and a pressing cylinder rod which telescopically cooperates with the pressing cylinder rod is provided at one end of the pressing cylinder body which is away from the clamping module, and a second connecting frame which fixedly connects the pressing cylinder rod and the slide bar is provided between the pressing cylinder rod and the slide bar.

[0012] The clamping unit comprises a lifting frame, the lifting slide is installed on the lifting frame in a liftable manner, and the lifting frame has a translation stroke along the length direction of the arc groove.

[0013] A translation slider is fixed at the bottom of the lifting frame, and a translation track is installed on the base in a left-right symmetrical manner. The translation slider and the translation track are slidably matched. A translation cylinder body is also fixedly installed on the base, and a translation cylinder rod that telescopes with the translation cylinder body is provided at one end of the translation cylinder body close to the lifting frame, and the end of the translation cylinder rod is fixed to the lifting frame;

[0014] Two lifting tracks are installed on the lifting frame. A lifting slider is slidably connected to the lifting track in an up-and-down manner. The lifting slider is fixed to the lifting platform. A lifting cylinder body is also fixed to the lifting frame. The bottom end of the lifting cylinder body is provided with a lifting cylinder rod that telescopically cooperates with it. A first connecting frame for fixedly connecting the bottom end of the lifting cylinder rod and the lifting platform is provided between them.

[0015] Two sets of sliding sleeves are provided at the inner end of the lifting platform close to the center of the pedestal. A telescopic guide rail that slidably cooperates with the sliding sleeve penetrates through the sliding sleeve. A telescopic cylinder body is also fixed to the middle of the lifting platform. The inner end of the telescopic cylinder body is provided with a telescopic cylinder rod that telescopically cooperates with it. The inner ends of the telescopic cylinder rod and the telescopic guide rail are both fixed to the clamping member.

[0016] An auxiliary module located above the pedestal is further included. The auxiliary module includes a fixed auxiliary cylinder body. The bottom end of the auxiliary cylinder body is provided with an auxiliary cylinder rod that telescopically moves up and down. The auxiliary cylinder rod is centrally arranged between the two clamping members. An installation seat is provided at the bottom end of the auxiliary cylinder rod. Inner insertion shafts are symmetrically provided on both sides of the installation seat respectively. The inner insertion shafts are arranged in the same direction relative to the arc-shaped groove. The outer diameter of the inner insertion shaft corresponds to the inner diameter of the shaft sleeve. A circular cushion block is provided at the inner end of the inner insertion shaft close to the installation seat. The diameter of the cushion block corresponds to the diameter of the valve rod.

[0017] When the auxiliary cylinder rod is at the top of its stroke, material grooves with inner insertion shafts arranged in the same direction are provided on both sides of the installation seat. A notch is provided at the top of the material groove. The width of the notch is adapted to the diameter of the shaft sleeve. The shaft sleeve in the notch is coaxial with the inner insertion shafts on both sides of the installation seat after rising. A blanking cylinder is fixedly installed above the notch. The cross-section of the blanking cylinder is adapted to a single shaft sleeve. A top column is provided at the outer end of the material groove away from the auxiliary cylinder body. A pushing cylinder body is provided at the lower end of the material groove. The outer end of the pushing cylinder body is provided with a pushing cylinder rod that telescopically cooperates with it. The pushing cylinder rod is fixedly connected to the outer end of the top column, so that the top column has a horizontal reciprocating stroke in the length direction of the material groove, and the stroke length of the reciprocating stroke corresponds to the thickness of a shaft sleeve.

[0018] A positioning cylinder body is fixedly provided on the pedestal. The positioning cylinder body is arranged in the same direction relative to the shaft groove. A positioning cylinder rod is provided at one end of the positioning cylinder body close to the clamping block. When the lifting platform is at the upper end of its stroke, the valve rod hole of the clamped valve seat is coaxial with the positioning lever. A positioning member that is coaxially inserted and matched with the outer end of the upper valve rod hole is provided at the end of the positioning cylinder rod.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The assembly of the valve seat, valve disc, and valve stem through this platform realizes the automation of the assembly method and actions. Through stroke setting and mechanical positioning, the consistency of multiple components in position, especially in the valve stem assembly position, can be maintained, greatly reducing the inevitable errors in manual assembly, reducing the defective rate caused by assembly errors, and enhancing the overall reliability of the product. High-precision, high-efficiency, and highly integrated automated assembly is achieved, ensuring the high quality and high performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the overall schematic diagram of the present invention.

[0022] Figure 2 is the front-end schematic diagram of the present invention.

[0023] Figure 3 is the top view of the present invention.

[0024] Figure 4 is the side view of the present invention.

[0025] Figure 5 is the sectional view A-A of the present invention.

[0026] Figure 6 is the schematic diagram of the partial component structure of the sectional view A-A of the present invention.

[0027] Figure 7 is the schematic diagram of the sectional view B-B of the present invention.

[0028] Figure 8 is the schematic diagram of the clamping module, positioning module, and assembly module of the present invention (the clamping part is located at the clamping position).

[0029] Figure 9 is the schematic diagram of the positioning module and assembly module of the present invention.

[0030] Figure 10 is the schematic diagram of the auxiliary module of the present invention.

[0031] Reference numerals shown in the drawings:

[0032] 1. Base; 2. Translation track; 3. Translation cylinder block; 4. Lifting frame; 5. Lifting track; 6. Lifting platform; 7. Lifting cylinder block; 8. First connecting frame; 9. Sliding sleeve; 10. Telescopic guide rail; 11. Telescopic cylinder block; 12. Clamping piece; 13. Annular baffle; 14. Gantry bracket; 15. Positioning cylinder block; 16. Positioning cylinder rod; 17. Positioning piece; 18. Inner ejector rod; 19. Positioning tray; 20. Arc groove; 21. Guide ring; 22. Guide port; 23. Ear plate; 24. Expansion rod; 25. Expansion tube; 26. Shaft groove; 27. Pressing cylinder block; 28. Guide sleeve; 29. Slide groove; 30. Slide bar; 31. Pushing block; 32. Second connecting frame; 33. Pressing cylinder rod; 34. Hoisting frame; 35. Auxiliary cylinder block; 36. Auxiliary cylinder rod; 37. Mounting seat; 38. Inner insertion shaft; 39. Material groove; 40. Feeding cylinder; 41. Top column; 42. Pushing material cylinder block; 43. Pushing material cylinder rod. Detailed implementation manners

[0033] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by this application.

[0034] Embodiment 1: An automatic pressing and assembling platform for an engine exhaust butterfly valve

[0035] This platform can not only complete the automatic positioning and assembly of the disc, valve body (with sealing ring), and valve stem, but also take into account the automatic installation and positioning of the shaft sleeve, realizing the automation of the assembly of important components related to the sealing and rotating components.

[0036] The components to be pressed include:

[0037] Valve body (valve seat): The core housing part of the exhaust butterfly valve, and the sealing ring has been fitted into the valve body. It has an annular structure with an upper valve stem hole and a lower valve stem hole in a tubular structure. The upper valve stem hole is close to the actuator or controller end, and the lower valve stem hole is mainly used to support the valve stem and the butterfly plate to ensure the correct position and stable rotation of the butterfly plate in the valve body.

[0038] Disc (valve plate): Controls the opening and closing of the exhaust passage. It has a valve stem tube in the center for passing through the valve stem.

[0039] Valve stem: Connects the butterfly plate and the actuator, and is used to transmit power and control the rotation of the butterfly plate.

[0040] Shaft sleeve: An annular component that cooperates with the valve stem, usually installed at the lower end of the upper valve stem hole and the upper end of the lower valve stem hole, and some products are installed at both ends of the upper valve stem hole.

[0041] Based on the requirement that the above components need to be closely assembled and pressed in space, the main structure of this assembly platform includes a pedestal 1. The pedestal 1 has a smooth and flat tabletop on its top surface, thereby providing support for the installation of other components and an operating surface for operations.

[0042] On and above the pedestal 1, there are provided the following components belonging to this assembly platform: a clamping module, a positioning module, an assembly module, and an auxiliary module;

[0043] Clamping module

[0044] It includes two groups of clamping units arranged symmetrically. Each group of clamping units includes two translation tracks 2 fixedly installed on the pedestal 1. A translation slider slidably engaged with the translation tracks 2 is provided on the translation tracks 2. The top end of the translation slider is fixedly provided with a lifting frame 4 fixedly connected thereto. A translation cylinder body 3 is also fixedly installed on the pedestal 1. The translation cylinder body 3 is arranged parallel to the translation tracks 2. A translation cylinder rod telescopically engaged with the translation cylinder body 3 is provided at one end of the translation cylinder body 3 close to the lifting frame 4. The end of the translation cylinder rod is fixedly connected to one side of the bottom of the lifting frame 4 through a bolt member, realizing the driving and control of the translation position.

[0045] The lifting frame 4 adopts a U-shaped sheet metal metal frame structure with an installation position in the center. Two lifting tracks 5 are symmetrically installed on the left and right sides of the lifting frame 4 respectively. A lifting slider slidably connected with the lifting tracks 5 up and down is engaged with the lifting tracks 5. The four lifting sliders are all fixedly installed on a lifting platform 6 located inside the lifting frame 4. The lifting platform 6 also adopts a U-shaped sheet metal frame. The two sides of the lifting platform 6 are respectively fixedly connected to the two lifting sliders on the same side through bolt members, realizing the guiding of the lifting of the lifting platform 6. An installation platform is provided on one side of the lifting frame 4. A lifting cylinder body 7 is fixedly installed on the installation platform. A lifting cylinder rod telescopically engaged with the lifting cylinder body 7 is provided at the bottom end of the lifting cylinder body 7. A first connecting frame 8 fixedly connected thereto is provided at the bottom end of the lifting cylinder rod. The end of the first connecting frame 8 away from the lifting cylinder rod is fixedly installed at the bottom of the lifting platform 6, realizing the driving and control of the lifting stroke.

[0046] Two sets of sliding sleeves 9 are provided at the inner end of the lifting table 6 close to the center of the pedestal 1. A telescopic guide rail 10 that is slidably engaged with the sliding sleeves 9 penetrates through the sliding sleeves 9. A telescopic cylinder body 11 is also fixed in the middle of the lifting table 6. An inner end of the telescopic cylinder body 11 is provided with a telescopic cylinder rod that is telescopically engaged with the telescopic cylinder body 11. Inner ends of the telescopic cylinder rod and the telescopic guide rail 10 are both fixed to the clamping member 12. The clamping member 12 is an arc-shaped member. The clamping members 12 of the two clamping units are arranged oppositely, and an arc-shaped curved surface corresponding to the circumferential side of the valve seat is provided on the adjacent inner sides of the two clamping members 12. The diameter of the arc-shaped curved surface corresponds to the outer diameter of the valve seat. The arc-shaped curved surface is set to a radian of 120, which can stably keep the workpiece from shifting when there is resistance to lateral movement. Without being limited to this example, arcs of other lengths can also be used. A ring-shaped baffle 13 that is perpendicular to the arc-shaped curved surface and extends horizontally is provided on the top side of the clamping member 12. The bottom surface of the ring-shaped baffle 13 is used to contact the top-side annular end surface of the assembled valve seat. When the ring-shaped baffle 13 is used to press down during assembly, it can keep the workpiece from moving, achieving a strong compaction effect during assembly and improving the assembly accuracy.

[0047] When the lifting table 6 is at the upper end of its stroke and when the circumferential surface of the valve seat is clamped between the two clamping members 12 and the top-side annular end surface of the valve seat contacts the bottom surface of the ring-shaped baffle 13, the position where the valve seat is located is defined as the clamping position. The correct clamping state is that the valve stem hole of the valve seat is centered relative to the two clamping members 12.

[0048] Based on the above structure, the clamping member 12 has a telescopic stroke. By the mutual approach of the clamping members 12 of the two side armor units, the valve seat located between them can be clamped and fixed. After clamping, it has a lifting stroke through the lifting table 6 to achieve positioning and change of the height position, and has a translation stroke through the lifting frame 4 to move the valve seat left and right.

[0049] Positioning module

[0050] It includes a gantry bracket 14 fixedly installed relative to the pedestal 1. A folding plate that is bolted to the pedestal 1 is provided at the bottom side of the gantry bracket 14. Multiple hole positions are preset on the folding plate for convenient fixation. A positioning cylinder body 15 is fixed to the top of the gantry bracket 14. The length direction of the positioning cylinder body 15 is parallel to the length direction of the translation track 2. Based on the correspondence between the length directions of the translation track 2 and the pedestal 1, the two clamping units on both sides are symmetrically arranged along the width direction relative to the positioning cylinder body 15. The positioning cylinder body 15 is arranged in a dislocation manner along its length direction relative to the clamping module.

[0051] When the valve seat is clamped between the clamping members 12 and when the lifting table 6 is at the upper end of its stroke, the valve stem hole of the valve seat can be coaxially corresponding to the positioning cylinder rod 16. That is, for the valve seat located at the clamping position, its valve stem hole should be coaxially corresponding to the positioning cylinder rod 16 and can be inserted by the positioning cylinder rod 16.

[0052] A positioning member 17 is provided at the end of the positioning cylinder rod 16 and is adapted to the outer end of the upper valve rod hole. The positioning member 17 can be of an insertion type or a sleeve type:

[0053] (1) When the positioning member 17 adopts an insertion structure, a positioning plug rod coaxial with it can be provided at the end of the positioning cylinder rod 16. The positioning plug rod corresponds to the inner diameter of the upper valve rod hole, and the alignment of the central axis of the valve seat is achieved by inserting the upper end of the upper valve rod hole of the valve seat. In specific operations, the auxiliary clamping mechanism completes the positioning function of the valve rod installation hole position.

[0054] (2) When the positioning member 17 adopts a sleeve type structure, the positioning member 17 is a sleeve provided at the end of the cylinder rod and coaxially arranged. The inner diameter of the sleeve corresponds to the outer diameter of the upper end of the upper valve rod hole, and the alignment of the central axis of the valve seat is achieved by sleeving the upper end of the upper valve rod hole of the valve seat. In specific operations, the auxiliary clamping mechanism completes the positioning function of the valve rod installation hole position.

[0055] The advantage of adopting the (1) mode is that the structure is simple, convenient for workers to cooperate in operation, and can quickly achieve insertion combination;

[0056] Adopting the (2) mode can handle more complex assemblies. For example, for the lower valve rod hole, only the connection strength and stability with the butterfly plate need to be emphasized. The design of the upper valve rod hole usually needs to consider the connection method with the actuator. Therefore, for some products, bushings may need to be installed at the upper and lower ends of the upper valve rod hole respectively. In this mode, an inner ejector rod 18 is also fixedly centered inside the sleeve. The inner diameter of the inner ejector rod 18 is adapted to the inner diameter of the bushing. On the bottom surface of the sleeve, a stepped structure can also be provided at the root of the inner ejector rod 18 according to the assembly depth. The outer diameter of the step is smaller than the inner diameter of the outer valve rod hole, and the height of the stepped structure is the same as the depth of the installed bushing, which is used to locate the assembly position. During specific processing, the bushing is sleeved on the inner ejector rod 18, and the upper bushing is assembled by insertion. (Based on the complexity of this mode, the structure of this mode is shown in the figure.)

[0057] Assembly module

[0058] The corresponding clamping module is used to clamp and fix the valve seat, and the assembly module is used to position the disc and the valve rod.

[0059] The assembly module includes a valve plate mechanism and a valve rod mechanism.

[0060] (1) Valve plate mechanism

[0061] It includes a positioning tray 19. The outer diameter of the positioning tray 19 is slightly smaller than the diameter of the valve disc, which does not cause additional resistance to the assembly of the valve disc and the valve seat. The positioning tray 19 is centered below the clamping position, and the bottom of the positioning tray 19 is fixedly installed relative to the top surface of the pedestal 1, and is fixed by adding structures such as a support frame. An arc-shaped groove 20 runs through the top surface of the positioning tray 19 along the axis. The length direction of the arc-shaped groove 20 corresponds to the length direction of the translation track 2. The bottom of the arc-shaped groove 20 is arc-shaped, and the curved surface at the bottom of the arc-shaped groove 20 is adapted to the protrusion on the circumferential surface of the valve stem tube of the valve disc, and is used to adapt to and accommodate the protrusion in the middle of the valve disc. Based on this structure, when the valve disc is placed on the positioning tray 19, the position of the valve stem tube of the valve disc can be automatically positioned in the center, making the positioning accurate when it is inserted into the valve stem.

[0062] A guide ring 21 is provided on the circumferential side of the positioning tray 19. The guide ring 21 is a vertically extending annular assembly. The inner ring of the guide ring 21 is adapted to the circumferential side of the valve disc, and can align the valve disc vertically relative to the clamping position.

[0063] A horn-shaped guide port 22 is provided on the top side of the inner wall of the guide ring 21. The inner diameter of the guide port 22 increases from bottom to top. When the valve disc is placed on the positioning tray 19, the valve disc is guided and positioned through the guide port 22, so that the valve disc falls in the center on the positioning tray 19.

[0064] A telescopic rod 24 is provided on the circumferential side of the guide ring 21. To improve stability, in this example, outwardly protruding ear plates 23 are symmetrically provided on the outer wall of the guide ring 21, and two telescopic rods 24 are fixed on the same side of the ear plates 23 to stably support the lifting and guiding of the guide ring 21. A telescopic tube 25 that is telescopically matched with the telescopic rod 24 is fixed on the pedestal 1. The top of the telescopic tube 25 is inserted by the telescopic rod 24. A lower spring seat is provided at the bottom end of the telescopic tube 25, and an upper spring seat is provided at the top end of the telescopic rod 24. A spring member (a spiral spring is used, and it is not shown in the drawings to reflect the telescopic structure) is provided between the upper spring seat and the lower spring seat. The spring member is sleeved outside the telescopic rod 24 and the telescopic tube 25. In the non-compressed state, the spring member makes the guide ring 21 sleeved outside the positioning tray 19. When the entire lifting table 6 descends, the bottom surface of the valve seat follows downward, and the valve disc remains centered on the positioning tray 19 and is thus passively sleeved into the valve seat. When the lifting table 6 is at the lower end of its stroke, the valve stem hole of the valve seat corresponds coaxially to the valve stem tube of the valve disc, making preparations for the assembly position.

[0065] (2) Valve stem mechanism

[0066] It includes a shaft groove 26 and a pressing cylinder body 27 that are fixed relative to the pedestal 1.

[0067] The shaft groove 26 and the pressing cylinder body 27 are arranged concentrically and in the same direction from top to bottom below the positioning cylinder body 15.

[0068] To facilitate the integrated installation position, the shaft groove 26 penetrates and is fixed within the portal bracket 14. A boss protruding inwards is provided in the middle of the portal bracket 14. Wings are provided on both sides of the shaft groove 26, and mounting holes are provided on the wings and fixed to the boss by bolt members. This realizes a reasonable layout of space and simplifies the installation.

[0069] The bottom of the shaft groove 26 is a semi-circular arc groove bottom corresponding to the circumferential surface of the valve stem. The width of the shaft groove 26 is adapted to the diameter of the valve stem. A guide sleeve 28 coaxial with the bottom of the shaft groove 26 is provided at one end of the shaft groove 26 close to the clamping position. The outer end face of the guide sleeve 28 is close to the outer end of the upper valve stem hole of the valve seat located at the positioning tray 19.

[0070] The bottom of the shaft groove 26 is coaxial with the arc groove 20 of the positioning tray 19.

[0071] The length of the shaft groove 26 is longer than the length of the valve stem. A sliding groove 29 penetrating it is provided in the middle of the bottom of the shaft groove 26. A sliding bar 30 slidably cooperating with it penetrates the sliding groove 29. A cylindrical push block 31 is provided at the top of the sliding bar 30. The push block 31 is coaxial with the bottom of the shaft groove 26. The diameter of the push block 31 corresponds to or is less than the diameter of the valve stem. A second connecting frame 32 is provided at the bottom end of the sliding bar 30.

[0072] The pressing cylinder body 27 is arranged side by side with the shaft groove 26 vertically. The bottom of the pressing cylinder body 27 is fixed to the pedestal 1 by a portal-shaped support structure. A pressing cylinder rod 33 telescopically cooperating with it is provided at one end of the pressing cylinder body 27 away from the clamping module. The end of the pressing cylinder rod 33 is connected to the second connecting frame 32. The push block 31 is driven by the pressing cylinder body 27 to push the valve stem along the length direction of the shaft groove 26, and the valve stem penetrates the valve seat and the valve plate located on the positioning tray 19.

[0073] Auxiliary module

[0074] It includes a lifting frame 34 hoisted and fixed above the pedestal 1. An auxiliary cylinder body 35 is fixed in the middle of the lifting frame 34. An auxiliary cylinder rod 36 that moves up and down is provided at the bottom end of the auxiliary cylinder body 35. An installation seat 37 is provided at the bottom end of the auxiliary cylinder rod 36. The installation seat 37 is arranged symmetrically relative to the clamping position, so that the installation seat 37 is located at the center of the axis of the clamped valve seat.

[0075] On both sides of the mounting base 37, there are symmetrically arranged inner insertion shafts 38. The length direction of the inner insertion shafts 38 is parallel to that of the positioning cylinder rod 16. The outer diameter of the inner insertion shafts 38 corresponds to the inner diameter of the installed bushings. At the inner end of the inner insertion shafts 38 close to the mounting base 37, there are circular cushion blocks. The diameter of the cushion blocks corresponds to the diameter of the valve stem, and the height of the cushion blocks corresponds to the thickness of the sealing ring installed in the valve seat, which is used to penetrate the sealing ring and press the bushing into the valve stem hole.

[0076] When the auxiliary cylinder rod 36 extends downward to the bottom end of its stroke, the inner insertion shafts 38 are coaxially aligned with the positioning levers, so that the bushings sleeved on the inner insertion shafts 38 also correspond to the valve stem holes of the valve seats to be assembled, providing the positioning required for assembly.

[0077] On both sides of the lifting frame 34, there are respectively fixedly installed material troughs 39 relative to it. The top side of the material troughs 39 is of an open structure and there is a notch at the top. The bottom of the material troughs 39 is a semi-circular bottom corresponding to the bushing. The width of the notch corresponds to the diameter of the bushing, so that the bushings can be arranged in a row in the material troughs 39 to prepare for feeding.

[0078] When the auxiliary cylinder rod 36 is at the upper end of its stroke, the inner insertion shafts 38 are coaxial with the bottom of the material troughs 39, so that the inner insertion shafts 38 are coaxial with the bushings located in the material troughs 39. And in this state, the adjacent inner ends of the two material troughs 39 on both sides are close to the outer ends of the inner insertion shafts 38.

[0079] Above the notch, there is a blanking cylinder 40 fixedly installed relative to it. The cross-section of the blanking cylinder 40 is adapted to the projection area of a bushing in a horizontally placed state, so that the bushings are vertically arranged in a column in the blanking cylinder 40, and automatic replenishment of materials is realized based on gravity.

[0080] At the outer end of the material trough 39 away from the auxiliary cylinder body 35, there is a top column 41. The top column 41 is coaxially arranged with the bottom of the material trough 39. At the lower end of the material trough 39, there is a pushing cylinder body 42. At the outer end of the pushing cylinder body 42, there is a pushing cylinder rod 43 that is telescopically matched with it. The pushing cylinder rod 43 is fixedly connected to the outer end of the top column 41, so that the top column 41 has a horizontal reciprocating stroke in the length direction of the material trough 39, and the stroke length of this reciprocating stroke corresponds to the thickness of a bushing, and can push the bushings arranged in the material trough 39 towards the inner insertion shafts 38, so that a bushing is sleeved on the inner insertion shafts 38 to complete the feeding of the inner insertion shafts 38. When the top column 41 returns outward, the top column 41 vacates the space below the blanking cylinder 40, and a bushing in the blanking cylinder 40 drops to replenish.

[0081] Based on the cooperation of the above auxiliary modules, when the interpolation shaft 38 rises to the position of the material trough 39, the shaft sleeve is automatically sleeved on the interpolation shaft 38, and then the interpolation shaft 38 descends to the center of the valve seat. Then, the valve seat is clamped by the clamping mechanism and translated back and forth, while the interpolation shaft 38 remains stationary, so as to realize the insertion of the shaft sleeve into the valve stem hole of the valve seat and complete the assembly of the shaft sleeve. Thus, together with the auxiliary components, to the valve disc valve stem, all mechanical positioning and mechanical press-fitting assembly are completed.

[0082] Based on this assembly platform, the butterfly valve assembly process includes the following steps:

[0083] 1) Workpiece preparation: Check the model of the valve, and prepare the parts to be assembled, including the valve seat (if there is a sealing ring, assemble it), valve disc, valve stem, shaft sleeve; ensure that the surface of the workpiece has no impurities and dirt, and meets the quality requirements and design requirements.

[0084] Corresponding to this assembly platform, the shaft sleeve is loaded into the blanking cylinder 40.

[0085] The valve stem is loaded into the shaft groove 26.

[0086] The valve disc is loaded onto the positioning tray 19.

[0087] The above loading methods are not limited to the loading method, and can be supplemented manually or completed in combination with automated equipment, such as robotic arms, positioning and conveying equipment, piece-counting bins, etc.

[0088] 2) Valve seat positioning

[0089] 2.1) Place the valve seat in the position of the clamping position.

[0090] For the feeding part of the clamping module, it can be fed manually or automatically by a robotic arm.

[0091] 2.2) The positioning cylinder rod 16 extends, and the upper valve stem hole of the valve seat located in the clamping position is inserted and positioned through the positioning part 17, so as to realize the high-precision positioning of the valve seat, so that after being clamped, it can improve the shaft and alignment accuracy with other components during assembly.

[0092] 2.3) The lifting table 6 is located at the upper end of its lifting stroke, and the clamping parts 12 on both sides are relatively closed together to clamp and fix the valve seat in the middle. The valve seat is in a clamped state, that is: the valve stem hole of the valve seat is centered relative to the two clamping parts 12. The top-side annular end face of the valve seat is in contact with the bottom face of the annular baffle 13.

[0093] 3) Install the shaft sleeve

[0094] 3.1) When the two interpolation shafts 38 are at the same height as the material trough 39, the two interpolation shafts are respectively sleeved with two shaft sleeves.

[0095] 3.2) The two interpolation shafts 38 drop to the central position of the clamping position and remain stationary;

[0096] 3.3) The lifting frames 4 on both sides are synchronously started for the forward and backward translation strokes. Through the forward and backward translation, the upper valve stem hole and the lower valve stem hole of the valve seat are alternately inserted by the two interpolation shafts 38, and the bushings are left in the valve stem holes, completing the installation of the two bushings on the inner ring of the valve seat;

[0097] 3.4) After completing one action of the upper bushing, the interpolation rod rises and resets to the same height as the chute 39. Through the automatic inward pushing of the ejector pins 41 on both sides, the bushing is sleeved on the interpolation rod, and steps 3.1 - 3.4) are repeated during the next installation.

[0098] In a few cases, when it is necessary to additionally install a bushing at the outer end of the upper valve stem hole, it can cooperate with the translation stroke of the lifting frame 4, and the front end of the positioning cylinder rod 16 helps to press the bushing in.

[0099] 4) Sleeve the valve disc

[0100] The lifting table 6 starts the downward stroke. During this process, the clamping valve seat moves downward, pressing the guide ring 21 downward to make way until the lifting table 6 moves downward to the lower end of its lifting stroke, and the valve disc is located at the center of the valve seat;

[0101] 5) Press-fit assembly

[0102] The valve stem is located in the shaft groove 26. Through the expansion and contraction of the press-fit cylinder rod 33, the push block 31 is driven to push the valve stem outwards until the valve stem is inserted into the valve disc and the valve seat. During the pushing process, the valve stem is additionally constrained and guided by the guide sleeve 28, so that the axis of the valve stem during pushing is kept consistent with that of the valve seat and the valve disc under pressure.

[0103] The push block 31 resets to the outer end of the shaft groove 26, and the clamping modules on both sides release the valve seat, and then the assembled valve seat can be removed.

[0104] Through the above assembly platform, the automation of the assembly method and actions is realized. Through stroke setting and mechanical positioning, the consistency of multiple components in position, especially the assembly position of the valve stem, can be maintained, greatly reducing the inevitable errors in manual assembly, reducing the defective rate caused by assembly errors, and improving the overall reliability of the product. High-precision, high-efficiency, and highly integrated automated assembly is achieved, ensuring the high quality and high performance of the product.

Claims

1. An automated press-fitting and assembly platform for an engine exhaust butterfly valve, characterized in that, It includes a pedestal, on which clamping units are symmetrically arranged left and right. The clamping unit includes a lifting frame and a lifting table. The lifting table is installed on the lifting frame in a liftable manner, and a clamping member with a telescopic stroke is installed on the lifting table. The two clamping members are brought together or separated based on their respective telescopic strokes, so that the valve seat of the butterfly valve is clamped between the two clamping members with its valve stem hole centered. A positioning tray and a shaft groove with corresponding heights are also fixed on the pedestal. The diameter of the positioning tray is not greater than the diameter of the valve disc. An arc groove adapted to the middle part of the valve disc is provided in the center of the top surface of the positioning tray. The positioning tray and the arc groove are both arranged centered relative to the clamping unit. The shaft groove is arranged in the same direction as the arc groove. One end of the shaft groove is close to the side of the positioning tray. A push block is provided in the shaft groove. The push block has a linear stroke along the length direction of the shaft groove. The lifting frame has a translation stroke along the length direction of the arc groove. It also includes an auxiliary module located above the pedestal. The auxiliary module includes a fixed auxiliary cylinder body. The bottom end of the auxiliary cylinder body is provided with an auxiliary cylinder rod that can be telescoped up and down. The auxiliary cylinder rod is arranged centered between the two clamping members. An installation seat is provided at the bottom end of the auxiliary cylinder rod. Inner insertion shafts are symmetrically arranged on both sides of the installation seat respectively. The inner insertion shafts are arranged in the same direction as the arc groove. The outer diameter of the inner insertion shaft corresponds to the inner diameter of the shaft sleeve. A circular cushion block is provided at the inner end of the inner insertion shaft close to the installation seat. The diameter of the cushion block corresponds to the diameter of the valve stem.

2. The automated press-fitting and assembly platform for an engine exhaust butterfly valve according to claim 1, wherein A guide ring is provided on the periphery of the positioning tray. The inner ring of the guide ring is adapted to the periphery of the valve disc. A horn-shaped guide opening is provided on the top side of the inner wall of the guide ring. A telescopic rod is provided on the periphery of the guide ring. The lower part of the telescopic rod is fitted with a telescopic tube that is slidably connected to it up and down. A spring member is provided between the telescopic rod and the telescopic tube to make them move away from each other.

3. The automated press-fitting and assembly platform for an engine exhaust butterfly valve according to claim 1, wherein An arc-shaped curved surface corresponding to the periphery of the valve seat is provided on the adjacent inner side of the clamping member. A circular baffle perpendicular to the arc-shaped curved surface and extending horizontally is provided on the top side of the clamping member. The bottom surface of the circular baffle is used to contact the top surface of the valve seat.

4. The automated press-fitting and assembly platform for an engine exhaust butterfly valve according to claim 1, characterized in that, The width of the shaft groove corresponds to the diameter of the valve stem. A guide sleeve coaxial with the bottom of the shaft groove is provided at one end of the shaft groove close to the clamping position. A chute penetrating through the center of the bottom of the shaft groove is provided at the bottom of the shaft groove. A slide bar slidably fitted with the chute is penetrated in the chute. The push block is cylindrical and fixed on the top of the slide bar. A pressing cylinder body fixed on the pedestal is provided below the shaft groove. A pressing cylinder rod telescopically fitted with the pressing cylinder body is provided at one end of the pressing cylinder body away from the clamping module. A second connecting frame for fixedly connecting the pressing cylinder rod and the slide bar is provided between the pressing cylinder rod and the slide bar.

5. The automated press-fitting and assembly platform for an engine exhaust butterfly valve according to claim 1, characterized in that, A translation slider is fixed at the bottom of the lifting frame. Translation tracks are symmetrically installed left and right on the pedestal. The translation slider is slidably fitted with the translation track. A translation cylinder body is also fixedly installed on the pedestal. A translation cylinder rod telescopically fitted with the translation cylinder body is provided at one end of the translation cylinder body close to the lifting frame. The end of the translation cylinder rod is fixed to the lifting frame. Two lifting rails are installed on the lifting frame. A lifting slider is fitted on the lifting rail and is slidably connected to the lifting rail up and down. The lifting slider is fixed on the lifting platform. A lifting cylinder body is also fixed on the lifting frame. A lifting cylinder rod that telescopically cooperates with the lifting cylinder body is provided at the bottom end of the lifting cylinder body. A first connecting frame that fixedly connects the bottom end of the lifting cylinder rod and the lifting platform is provided between the bottom end of the lifting cylinder rod and the lifting platform. Two sets of sliding sleeves are provided at the inner end of the lifting platform close to the center of the pedestal. A telescopic guide rail that slidably cooperates with the sliding sleeve is penetrated through the sliding sleeve. A telescopic cylinder body is also fixed in the middle of the lifting platform. A telescopic cylinder rod that telescopically cooperates with the telescopic cylinder body is provided at the inner end of the telescopic cylinder body. The inner ends of the telescopic cylinder rod and the telescopic guide rail are both fixed on the clamping member.

6. The automated press-fitting and assembly platform for an engine exhaust butterfly valve according to claim 1, characterized in that When the auxiliary cylinder rod is at the top end of its stroke, material grooves with the inner insertion shafts arranged in the same direction are respectively provided on both sides of the mounting seat. A notch is provided at the top of the material groove. The width of the notch is adapted to the diameter of the shaft sleeve. The shaft sleeve in the notch is coaxial with the inner insertion shafts on both sides of the mounting seat after it is lifted. A blanking cylinder is fixedly installed relative to the notch above the notch. The cross section of the blanking cylinder is adapted to a single shaft sleeve. A top column is provided at the outer end of the material groove away from the auxiliary cylinder body. A pushing cylinder body is provided at the lower end of the material groove. A pushing cylinder rod that telescopically cooperates with the pushing cylinder body is provided at the outer end of the pushing cylinder body. The pushing cylinder rod is fixedly connected to the outer end of the top column, so that the top column has a horizontal reciprocating stroke in the length direction of the material groove, and the stroke length of the reciprocating stroke corresponds to the thickness of a shaft sleeve.

7. The automated press-fitting and assembly platform for an engine exhaust butterfly valve according to claim 1, wherein A positioning cylinder body is fixedly provided on the pedestal. The positioning cylinder body is arranged in the same direction as the shaft groove. A positioning cylinder rod is provided at one end of the positioning cylinder body close to the clamping block. When the lifting platform is at the upper end of its stroke, the valve rod hole of the valve seat is coaxial with the positioning cylinder rod. A positioning member that is coaxially inserted and fitted with the outer end of the upper valve rod hole is provided at the end of the positioning cylinder rod.

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