Automatic press-fit assembly platform for engine exhaust butterfly valve

Abstract

The invention discloses an automatic press-fit assembly platform for an engine exhaust butterfly valve, and mainly relates to the technical field of combined machining. Comprising a pedestal, clamping units are arranged on the pedestal in a bilateral symmetry mode, each clamping unit comprises a lifting table with a lifting stroke, clamping pieces with telescopic strokes are installed on the lifting tables, and a valve seat is clamped between the two clamping pieces in the state that a valve rod hole of the valve seat is centered; a positioning tray and a shaft groove which correspond to each other in height are further fixed to the pedestal, the diameter of the positioning tray is not larger than that of the valve plate, an arc-shaped groove matched with the middle of the valve plate is formed in the center of the top face of the positioning tray, and the positioning tray and the arc-shaped groove are both arranged in the center relative to the clamping unit. The shaft groove and the arc-shaped groove are arranged in the same direction, 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 has a linear stroke in the length direction of the shaft groove. The machine has the beneficial effects that mechanical combination alignment and assembly can be realized, so that the assembly precision and the production efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of combined processing, in particular to an automatic pressing and assembling platform for an engine exhaust butterfly valve. Background Art

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

[0003] First of all, sealing 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 cause poor contact between the sealing surfaces and leakage problems. Secondly, precise alignment can effectively extend the service life of the valve. Inaccurate alignment will lead to increased friction between components, especially at the connection between the valve stem and the disc, which is prone to fatigue fracture or deformation 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 and increase the energy loss of the engine.

[0004] In the production process, this step includes the installation of the sleeve, the assembly of the disc and the valve seat, the assembly of the valve stem, etc. Since the operation of the valve stem penetrating the disc and the valve seat needs to be completed in a limited space, it is also necessary to cooperate with the positioning and installation of multiple parts. The process also involves the coordinated assembly of multiple parts. It is difficult for automated equipment to achieve spatial operation flexibility, so it usually relies on manual work. Some companies have tried to introduce automated equipment, but they mainly focus on the processing and preliminary assembly stages of parts, and the key valve stem penetration step still relies on manual work. However, manual assembly is difficult to ensure the accuracy and consistency of each assembly, and it is easy to have problems such as poor sealing or inflexible rotation. It makes it difficult to stably control and guarantee product quality. The production efficiency is also relatively low, the labor cost is high, and it is more restricted by manual factors and has many uncertain factors, which has become a link in the end plate that restricts production. Summary of the invention

[0005] The object of the present invention is to provide an automatic pressing and assembling platform for an engine exhaust butterfly valve, which can realize mechanical combination alignment and assembly, thereby improving assembly accuracy and production efficiency.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions: 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; 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.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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; Two lifting rails are installed on the lifting frame, and the lifting rails are matched with lifting sliders connected to the lifting rails for sliding up and down, and the lifting sliders are fixed on the lifting platform. A lifting cylinder is also fixed on the lifting frame, and a lifting cylinder rod that is telescopically matched with the lifting cylinder is provided at the bottom end of the lifting cylinder, and a first connecting frame that fixedly connects the bottom end of the lifting cylinder rod and the lifting platform is provided between the two. The inner end of the lifting platform close to the center of the base is provided with two sets of sliding sleeves, and the sliding sleeves are penetrated by telescopic guide rails that slide and cooperate with each other. A telescopic cylinder body is also fixed in the middle of the lifting platform, and the inner end of the telescopic cylinder body is provided with a telescopic cylinder rod that telescopically cooperates with the telescopic cylinder body, and the inner end of the telescopic cylinder rod and the inner end of the telescopic guide rail are both fixed on the clamping member.

[0012] 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 centrally arranged in the center of two clamping members, the bottom end of the auxiliary cylinder rod is provided with a mounting seat, both sides of the mounting seat are symmetrically provided with an inserted shaft, the inserted shaft is arranged in the same direction relative to the arc groove, the outer diameter of the inserted shaft corresponds to the inner diameter of the sleeve, and the inner end of the inserted shaft close to the mounting seat is provided with a circular pad, the diameter of the pad corresponds to the diameter of the valve stem.

[0013] When the auxiliary cylinder rod is at the top of its stroke, both sides of the mounting seat are respectively provided with material troughs which are arranged in the same direction as the inserted shaft, and the top of the material trough is provided with a notch, the width of the notch is adapted to the diameter of the sleeve, the sleeve in the notch is coaxial with the inserted shaft on both sides of the mounting seat after lifting, and a lower material barrel fixedly mounted relative to it is provided above the notch, the cross-section of the lower material barrel is adapted to a single sleeve, and the outer end of the material trough away from the auxiliary cylinder body is provided with a push column, the lower end of the material trough is provided with a pushing cylinder body, the outer end of the pushing cylinder body is provided with a pushing cylinder rod which is telescopically matched with the pushing cylinder rod, and the pushing cylinder rod is fixedly connected to the outer end of the push column, so that the push column has a horizontal reciprocating stroke relative to the length direction of the material trough, and the stroke length of the reciprocating stroke corresponds to the thickness of a sleeve.

[0014] A positioning cylinder body is fixed on the base, and 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 located at the upper end of its stroke, the valve stem hole of the clamped valve seat is coaxial with the positioning lever, and the end of the positioning cylinder rod is provided with a positioning piece which is coaxially plugged with the outer end of the upper valve stem hole.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The platform is used to assemble the valve seat, valve plate, and valve stem, realizing the automation of assembly methods and actions. Through stroke setting and mechanical positioning, the positions of multiple components, especially the consistency of the valve stem assembly position, can be maintained, which greatly reduces the inevitable errors of manual assembly, reduces the defective rate caused by assembly errors, and improves the overall reliability of the product. It realizes high-precision, high-efficiency, and high-integration automated assembly to ensure the high quality and high performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an overall schematic diagram of the present invention.

[0017] Figure 2 It is a front-end schematic diagram of the present invention.

[0018] Figure 3 It is a top view of the present invention.

[0019] Figure 4 It is a side view of the present invention.

[0020] Figure 5 It is an AA cross-sectional view of the present invention.

[0021] Figure 6 It is a schematic diagram of the structure of some components of the present invention viewed along AA section.

[0022] Figure 7 It is a schematic structural diagram of the BB section of the present invention.

[0023] Figure 8 It is a schematic diagram of the clamping module and the positioning module assembly module of the present invention (the clamping member is located at the clamping position).

[0024] Fig. 9 It is a schematic diagram of the positioning module and the assembly module of the present invention.

[0025] Fig.10 Schematic diagram of the auxiliary module of the present invention.

[0026] Numbers shown in the accompanying drawings: 1. Base; 2. Translation track; 3. Translation cylinder; 4. Lifting frame; 5. Lifting track; 6. Lifting platform; 7. Lifting cylinder; 8. First connecting frame; 9. Sliding sleeve; 10. Telescopic guide rail; 11. Telescopic cylinder; 12. Clamping piece; 13. Annular baffle; 14. Door bracket; 15. Positioning cylinder; 16. Positioning cylinder rod; 17. Positioning piece; 18. Inner push rod; 19. Positioning tray; 20. Arc groove; 21. Guide ring; 22. Guide opening; 23, ear plate; 24, telescopic rod; 25, telescopic tube; 26, shaft groove; 27, pressing cylinder body; 28, guide sleeve; 29, slide groove; 30, slide bar; 31, push block; 32, second connecting frame; 33, pressing cylinder rod; 34, lifting frame; 35, auxiliary cylinder body; 36, auxiliary cylinder rod; 37, mounting seat; 38, inserted shaft; 39, material trough; 40, unloading barrel; 41, ejector column; 42, pushing cylinder body; 43, pushing cylinder rod. DETAILED DESCRIPTION

[0027] 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 are not intended 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 fall within the scope limited by the application equally.

[0028] Example 1: An automated press-fit assembly platform for engine exhaust butterfly valves The platform can complete the automatic positioning and assembly of the disc, valve body (with sealing ring), and valve stem, while also taking into account the automatic installation and positioning of the sleeve, automating the assembly of important components related to sealing and rotating components.

[0029] The components pressed together include: Valve body (valve seat): The core shell part of the exhaust butterfly valve, which has the sealing ring fitted in the valve body. The upper valve stem hole and the lower valve stem hole of the annular structure and the 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.

[0030] Disc (valve): controls the opening and closing of the exhaust passage. There is a valve stem tube in the center for the valve stem to pass through.

[0031] Valve stem: connects the butterfly plate and the actuator, used to transmit power and control the rotation of the butterfly plate.

[0032] Bushing: An annular component that matches 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. Some products are also installed at both ends of the upper valve stem hole.

[0033] Based on the requirement that the above components need to be closely matched in space for assembly and pressing, the main structure of the assembly platform includes a base 1, and the base 1 has a smooth and flat surface on the top, thereby providing support for the installation of other components and an operating surface for operation.

[0034] The pedestal 1 and the pedestal 1 are provided with the following components belonging to the assembly platform: a clamping module, a positioning module, an assembly module, and an auxiliary module; Clamping module

[0035] It includes two symmetrically arranged clamping units, each assembly unit includes two translation rails 2 fixedly mounted on a pedestal 1, the translation rails 2 are provided with a translation slider slidably matched therewith, a lifting frame 4 fixedly connected therewith is fixed to the top of the translation slider, and a translation cylinder body 3 is also fixed on the pedestal 1, the translation cylinder body 3 is arranged parallel to the translation rails 2, and one end of the translation cylinder body 3 close to the lifting frame 4 is provided with a translation cylinder rod telescopically matched therewith, and the end of the translation cylinder rod is fixed to one side of the bottom of the lifting frame 4 by a bolt to realize the driving and control of the translation position.

[0036] The lifting frame 4 adopts a U-shaped sheet metal frame structure with a mounting position in the center, and two lifting rails 5 are symmetrically installed on the left and right sides of the lifting frame 4, and the lifting rails 5 are equipped with lifting sliders connected to the lifting rails for sliding up and down. Four lifting sliders are fixed on the lifting platform 6 located in the lifting frame 4, and the lifting platform 6 also adopts a U-shaped sheet metal frame. The two sides of the lifting platform 6 are respectively fixed to the two lifting sliders on the same side by bolts to guide the lifting of the lifting platform 6. A mounting platform is provided on one side of the lifting frame 4, and a lifting cylinder body 7 is fixedly installed on the mounting platform. The bottom end of the lifting cylinder body 7 is provided with a lifting cylinder rod that cooperates with the lifting cylinder rod for telescopic cooperation, and the bottom end of the lifting cylinder rod is provided with a first connecting frame 8 fixedly connected to the lifting cylinder rod, and the end of the first connecting frame 8 away from the lifting cylinder rod is fixed to the bottom of the lifting platform 6 to drive and control the lifting stroke.

[0037] The inner end of the lifting platform 6 close to the center of the base 1 is provided with two groups of sliding sleeves 9, and the sliding sleeves 9 are penetrated by telescopic guide rails 10 that slide and cooperate with the lifting platform 6. A telescopic cylinder body 11 is also fixed in the middle of the lifting platform 6, and the inner end of the telescopic cylinder body 11 is provided with a telescopic cylinder rod that telescopically cooperates with the lifting platform 6. The inner end of the telescopic cylinder rod and the inner end of the telescopic guide rail 10 are both fixed on a clamping member 12. The clamping member 12 is an arc-shaped member. The clamping members 12 of the two clamping units are arranged opposite to each other, and the adjacent inner sides of the two clamping members 12 are provided with an arc-shaped surface corresponding to the peripheral side of the valve seat. The diameter of the arc-shaped surface corresponds to the outer diameter of the valve seat. The arc-shaped surface is set to an arc of 120, which can stably keep the workpiece from shifting when encountering resistance when moving horizontally to the left or right. This is not limited to this example, and arcs of other lengths can also be used. The top side of the clamping member 12 is provided with an annular baffle 13 which is perpendicular to the arc surface and extends horizontally. The bottom surface of the annular baffle 13 is used to contact the top annular end surface of the assembled valve seat. The annular baffle 13 is used to keep the workpiece from moving during downward pressing and assembly, thereby achieving a strong compaction assembly effect and improving assembly accuracy.

[0038] When the lifting platform 6 is located 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 annular end surface of the valve seat is in contact with the bottom surface of the annular baffle 13, the position of the valve seat 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.

[0039] Based on the above structure, the clamping piece 12 has a telescopic stroke. By bringing the armored unit clamping pieces 12 on both sides closer together, the valve seat between the two can be clamped and fixed. After clamping, the lifting platform 6 has a lifting stroke to realize positioning and changing the height position. The lifting frame 4 has a translation stroke to move the valve seat left and right. Positioning module

[0040] It includes a door-type bracket 14 fixedly installed relative to the pedestal 1, and the bottom side of the door-type bracket 14 is provided with a folding plate fixed to the pedestal 1 by bolts. A plurality of holes are preset on the folding plate for easy fixation. A positioning cylinder 15 is fixed on the top of the door-type bracket 14, and the length direction of the positioning cylinder 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 clamping units on both sides are symmetrically arranged along the width direction relative to the positioning cylinder 15, and the positioning cylinder 15 is staggered along its length direction relative to the clamping module.

[0041] When the valve seat is clamped between the clamping members 12 and when the lifting platform 6 is at the upper end of its stroke, the valve stem hole of the valve seat can coaxially correspond to the positioning cylinder rod 16. That is, the valve stem hole of the valve seat located at the clamping position should coaxially correspond to the positioning cylinder rod 16 and can be inserted by the positioning cylinder rod 16.

[0042] The end of the positioning cylinder rod 16 is provided with a positioning member 17 that matches the outer end of the upper valve stem hole. The positioning member 17 can be an insert type or a sleeve type: (1) When the positioning member 17 adopts an inserting structure, a coaxial positioning plug rod 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 stem hole, and the positioning of the valve seat center axis is achieved by inserting the upper end of the upper valve stem hole of the valve seat. In the specific operation, the auxiliary clamping mechanism completes the positioning function of the valve stem installation hole.

[0043] (2) When the positioning member 17 adopts a sleeve-type structure, the positioning member 17 is a sleeve arranged 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 stem hole. The sleeve is inserted into the upper end of the valve stem hole on the valve seat to achieve the alignment of the valve seat center axis. In the specific operation, the auxiliary clamping mechanism completes the positioning function of the valve stem installation hole.

[0044] The advantages of adopting mode (1) are that the structure is simple, it is convenient for workers to cooperate with the operation, and the insertion and assembly can be realized quickly; Mode (2) can cope with more complex assembly. For example, the design of the upper valve stem hole usually needs to consider the connection method with the actuator, while the lower valve stem hole only needs to pay attention to the strength and stability of the connection with the butterfly plate. Therefore, some products may need to install sleeves at the upper and lower ends of the upper valve stem hole. Therefore, in this mode, an inner push rod 18 is fixed in the center of the sleeve. The inner diameter of the inner push rod 18 is adapted to the inner diameter of the sleeve. A step structure can also be set at the root of the inner push rod 18 on the bottom surface of the sleeve according to the depth of assembly. The outer diameter of the step is smaller than the inner diameter of the outer valve stem hole. The height of the step structure is the same as the depth of the installed sleeve, which is used to locate the assembly position. During the specific processing, the sleeve is put on the inner push rod 18 and the upper sleeve is assembled by insertion. (Since this mode is relatively complex, the structure of this mode is shown in the figure.) Assembly module

[0045] The corresponding clamping module is used to clamp and control the valve seat, and the assembly module is used to position the disc and the valve stem.

[0046] The assembly module comprises a valve plate mechanism and a valve stem mechanism.

[0047] (1) Valve mechanism It includes a positioning tray 19, the outer diameter of which is slightly smaller than the diameter of the valve disc, and does not cause additional resistance to the assembly of the valve disc and the valve seat. The positioning tray 19 is centrally located 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 a support frame and other structures. The top surface of the positioning tray 19 is penetrated by an arc groove 20 along the axis, and the length direction of the arc groove 20 corresponds to the length direction of the translation track 2. The bottom of the arc groove 20 is arc-shaped, and the bottom curved surface of the arc groove 20 is adapted to the convex surface of the valve stem tube of the valve disc, and is used to adapt to and accommodate the convexity in the middle of the valve disc. Based on this structure, when the valve disc is placed on the positioning tray 19, the valve stem tube position of the valve disc can be automatically positioned and centered, so that it can be accurately positioned when inserted into the valve stem.

[0048] A guide ring 21 is provided on the circumference of the positioning tray 19 . The guide ring 21 is a vertically extending annular component. The inner ring of the guide ring 21 is adapted to the circumference of the valve plate and can align the valve plate relative to the clamping position.

[0049] A trumpet-shaped guide opening 22 is provided on the top side of the inner wall of the guide ring 21 , and the inner diameter of the guide opening 22 increases from bottom to top. When the valve plate is placed on the positioning tray 19 , the valve plate is guided and positioned through the guide opening 22 so that the valve plate falls centered on the positioning tray 19 .

[0050] A telescopic rod 24 is provided on the peripheral side of the guide ring 21. In order to improve stability, in this example, an outwardly protruding ear plate 23 is symmetrically provided on the outer wall of the guide ring 21. Two telescopic rods 24 are fixed on the ear plates 23 on the same side to provide stable support for the lifting and lowering of the guide ring 21. A telescopic tube 25 that cooperates 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. An upper spring seat is provided at the top end of the telescopic rod 24. A spring member (a coil spring is used, which 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 on the outside of the telescopic rod 24 and the telescopic tube 25. When not compressed, the spring member causes the guide ring 21 to sleeve on the outside of the positioning tray 19. When the lifting platform 6 descends as a whole, the bottom surface of the valve seat moves downward, and the valve plate is centered and motionless on the positioning tray 19, so that it is passively inserted into the valve seat. When the lifting platform 6 is at the lower end of its stroke, the valve stem hole of the valve seat corresponds coaxially with the valve stem tube of the valve plate, and the position is ready for assembly.

[0051] (2) Valve stem mechanism It includes an axial groove 26 and a pressing cylinder body 27 fixed relative to the base 1.

[0052] The shaft groove 26 and the pressing cylinder body 27 are arranged in the same direction below the positioning cylinder body 15 in the middle from top to bottom.

[0053] In order to facilitate the integration of the installation position, the shaft groove 26 penetrates and is fixed in the door-shaped bracket 14. The middle part of the door-shaped bracket 14 is provided with an inwardly protruding boss. The two sides of the shaft groove 26 are provided with fin plates. The fin plates are provided with mounting holes and are fixed to the bosses by bolts. Reasonable space layout and simplified installation are achieved.

[0054] The bottom of the shaft groove 26 is the bottom of a semicircular arc groove 20 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. The end of the shaft groove 26 close to the clamping position is provided with a guide sleeve 28 which is cocircular with the bottom of the shaft groove 26. The outer end surface 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.

[0055] The bottom of the shaft groove 26 is coaxial with the arc groove 20 of the positioning tray 19 .

[0056] The length of the shaft groove 26 is longer than the length of the valve stem. A slide groove 29 is provided in the center of the bottom of the shaft groove 26 and penetrates therethrough. A slide bar 30 is penetrated in the slide groove 29 and slides therewith. A cylindrical push block 31 is provided at the top of the slide 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 smaller than the diameter of the valve stem. A second connecting frame 32 is provided at the bottom of the slide bar 30.

[0057] The pressing cylinder body 27 is arranged in parallel with the shaft groove 26 up and down, and the bottom of the pressing cylinder body 27 is fixed on the base 1 through a door-shaped supporting structure. The end of the pressing cylinder body 27 away from the clamping module is provided with a pressing cylinder rod 33 which is telescopically matched with it. The end of the pressing cylinder rod 33 is connected to the second connecting frame 32. The pressing cylinder body 27 drives the push block 31 to push the valve stem along the length direction of the shaft groove 26, so that the valve stem passes through the valve seat and valve plate located on the positioning tray 19. Auxiliary modules

[0058] It includes a hanging frame 34 which is hoisted and fixed above the pedestal 1, an auxiliary cylinder body 35 is fixed in the middle of the hanging frame 34, the bottom end of the auxiliary cylinder body 35 is provided with an auxiliary cylinder rod 36 which can be telescoped up and down, and the bottom end of the auxiliary cylinder rod 36 is provided with a mounting seat 37, and the mounting seat 37 is arranged in the center relative to the clamping position so that the mounting seat 37 is located in the center of the axis of the clamped valve seat.

[0059] An inserted shaft 38 is symmetrically provided on both sides of the mounting seat 37. The length direction of the inserted shaft 38 is arranged parallel to the positioning cylinder rod 16. The outer diameter of the inserted shaft 38 corresponds to the inner diameter of the installed sleeve. A circular pad is provided at the inner end of the inserted shaft 38 close to the mounting seat 37. The diameter of the pad corresponds to the diameter of the valve stem. The height of the pad corresponds to the thickness of the sealing ring installed in the valve seat, and is used to penetrate the sealing ring to press the sleeve into the valve stem hole.

[0060] When the auxiliary cylinder rod 36 extends downward to the bottom of its stroke, the inner plug shaft 38 is coaxially aligned with the positioning lever, so that the shaft sleeve on the inner plug shaft 38 also corresponds to the valve stem hole with the assembled valve seat, providing the positioning required for assembly.

[0061] The two sides of the lifting frame 34 are respectively provided with material troughs 39 fixedly installed relative thereto. The top side of the material trough 39 adopts an open structure and a notch is provided at the top. The bottom of the material trough 39 is a semicircular bottom corresponding to the shaft sleeve. The width of the notch corresponds to the diameter of the shaft sleeve, so that the shaft sleeves can be arranged in a row in the material trough 39 to prepare for loading.

[0062] When the auxiliary cylinder rod 36 is at the upper end of its stroke, the inserted shaft 38 is coaxial with the bottom of the trough 39, so that the inserted shaft 38 is coaxial with the sleeve located in the trough 39, and in this state, the adjacent inner ends of the troughs 39 on both sides are close to the outer ends of the inserted shaft 38.

[0063] A discharge barrel 40 is provided above the slot and fixedly mounted thereto. The cross section of the discharge barrel 40 is adapted to the projection area of ​​a sleeve in a horizontally placed state, so that the sleeves are arranged vertically in a row in the discharge barrel 40 to achieve automatic material replenishment based on gravity.

[0064] The outer end of the material trough 39 away from the auxiliary cylinder body 35 is provided with a push column 41, and the push column 41 is coaxially arranged with the bottom of the material trough 39. The lower end of the material trough 39 is provided with a pushing cylinder body 42, and the outer end of the pushing cylinder body 42 is provided with a pushing cylinder rod 43 which is telescopically matched with the pushing cylinder rod 43. The pushing cylinder rod 43 is fixedly connected to the outer end of the push column 41, so that the push column 41 has a horizontal reciprocating stroke relative to the length direction of the material trough 39, and the stroke length of the reciprocating stroke corresponds to the thickness of a sleeve, which can push the sleeves arranged in the material trough 39 toward the inner plug-in shaft 38, so that a sleeve is sleeved on the inner plug-in shaft 38 to complete the loading of the inner plug-in shaft 38. When the push column 41 is reset outward, the push column 41 makes room for the space below the lower barrel 40, and a sleeve in the lower barrel 40 falls down for replenishment.

[0065] Based on the cooperation of the above auxiliary modules, when the inner plug shaft 38 is raised to the position of the material slot 39, the shaft sleeve is automatically put on the inner plug shaft 38, and then the inner plug shaft 38 drops to the center of the valve seat, and then the valve seat is clamped by the clamping mechanism and translated back and forth, while the inner plug shaft 38 remains stationary, so that the shaft sleeve is inserted into the valve stem hole of the valve seat to realize the assembly of the shaft sleeve. Thus, the auxiliary components are connected to the valve plate and valve stem, and all mechanical positioning and mechanical pressing assembly are completed.

[0066] Based on this assembly platform, the butterfly valve assembly process is performed, and the steps include: 1) Workpiece preparation: Check the valve model and prepare the parts to be assembled, including the valve seat (if there is a sealing ring, assemble it), valve plate, valve stem, and shaft sleeve; ensure that the workpiece surface is free of impurities and dirt and meets the quality requirements and design requirements.

[0067] Corresponding to this assembly platform, the sleeve is loaded into the lower barrel 40; Loading the valve stem into the shaft groove 26; Loading valve sheets onto the positioning tray 19; The above-mentioned loading is not limited to the loading method, and can be supplemented manually or combined with automated equipment, such as robotic arms, positioning and conveying equipment, piece-counting silos, etc.

[0068] 2) Valve seat positioning 2.1) Place the valve seat in the clamping position. In the loading part of the clamping module, materials can be loaded manually or automatically by a robotic arm.

[0069] 2.2) The positioning cylinder rod 16 extends out, and the positioning member 17 is inserted into the upper valve stem hole of the valve seat at the clamping position to achieve high-precision positioning of the valve seat, so that after being clamped, the valve seat can be assembled with other components to improve the axis and position accuracy; 2.3) The lifting platform 6 is located at the upper end of its lifting stroke, and the clamping members 12 on both sides are relatively close together to clamp and fix the valve seat in the middle, and 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 members 12. The top side annular end surface of the valve seat contacts the bottom surface of the annular baffle 13.

[0070] 3) Upper sleeve 3.1) When the two inner plug shafts 38 are at the same height as the material trough 39, the two plug shafts are respectively covered with two shaft sleeves; 3.2) The two interpolated shafts 38 fall to the center of the clamping position and remain stopped; 3.3) The lifting frames 4 on both sides start the forward and backward translation stroke synchronously. 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 inserted shafts 38, and the shaft sleeves are left in the valve stem holes, completing the installation of the two shaft sleeves of the inner ring of the valve seat; 3.4) After the sleeve is installed once, the inner rod rises and resets to the same height as the trough 39. The sleeve is automatically pushed inward by the top columns 41 on both sides, and the inner rod is installed. Repeat steps 3.1-3.4) for the next installation.

[0071] In rare cases, when it is necessary to install a sleeve at the outer end of the upper valve stem hole, the sleeve can be pressed in by positioning the front end of the cylinder rod 16 in coordination with the translation stroke of the lifting frame 4.

[0072] 4) Valve sleeve The lifting platform 6 starts the downward stroke, during which the valve seat is clamped downward and the guide ring 21 is pressed downward to give way, until the lifting platform 6 moves downward to the lower end of its lifting stroke and the valve plate is located in the center of the valve seat; 5) Press-fit assembly The valve stem is located in the shaft groove 26. The push block 31 is driven to push the valve stem outward by the extension and contraction of the compression cylinder rod 33 until the valve stem is inserted into the valve plate and the valve seat. During the pushing process, the valve stem is restrained and guided by the guide sleeve 28 so that the axis of the valve stem, the valve seat and the valve plate are kept consistent under pressure.

[0073] The push block 31 is reset to the outer end of the shaft groove 26, and the clamping modules on both sides release the valve seat, so that the assembled valve seat can be removed.

[0074] The above assembly platform realizes the automation of assembly methods and actions. Through stroke setting and mechanical positioning, the positions of multiple components, especially the consistency of valve stem assembly positions, can be maintained, which greatly reduces the inevitable errors of manual assembly, reduces the defective rate caused by assembly errors, and improves the overall reliability of the product. It realizes high-precision, high-efficiency, and high-integration automated assembly to ensure high quality and high performance of the product.

Claims

1. An automated press-fit assembly platform for engine exhaust butterfly valves, characterized in that: The invention comprises a pedestal, on which a clamping unit is symmetrically arranged, wherein the clamping unit comprises a lifting platform with a lifting stroke, and a clamping member with a telescopic stroke is installed on the lifting platform, and 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 in a state where the valve stem hole thereof is centered; 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.

2. According to claim 1, an automatic press-fit assembly platform for engine exhaust butterfly valves, characterized in that: 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.

3. According to claim 1, an automatic pressing and assembling platform for engine exhaust butterfly valves, characterized in that: 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.

4. According to claim 1, an automatic pressing and assembling platform for engine exhaust butterfly valves, characterized in that: 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.

5. According to claim 1, an automatic pressing and assembling platform for engine exhaust butterfly valves, characterized in that: 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.

6. The automatic press-fit assembly platform for engine exhaust butterfly valves according to claim 5, characterized in that: 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; Two lifting rails are installed on the lifting frame, and the lifting rails are matched with lifting sliders connected to the lifting rails for sliding up and down, and the lifting sliders are fixed on the lifting platform. A lifting cylinder is also fixed on the lifting frame, and a lifting cylinder rod that is telescopically matched with the lifting cylinder is provided at the bottom end of the lifting cylinder, and a first connecting frame that fixedly connects the bottom end of the lifting cylinder rod and the lifting platform is provided between the two. The inner end of the lifting platform close to the center of the base is provided with two sets of sliding sleeves, and the sliding sleeves are penetrated by telescopic guide rails that slide and cooperate with each other. A telescopic cylinder body is also fixed in the middle of the lifting platform, and the inner end of the telescopic cylinder body is provided with a telescopic cylinder rod that telescopically cooperates with the telescopic cylinder body, and the inner end of the telescopic cylinder rod and the inner end of the telescopic guide rail are both fixed on the clamping member.

7. The automatic press-fit assembly platform for engine exhaust butterfly valves according to claim 5, characterized in that: 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 centrally arranged in the center of two clamping members, the bottom end of the auxiliary cylinder rod is provided with a mounting seat, both sides of the mounting seat are symmetrically provided with an inserted shaft, the inserted shaft is arranged in the same direction relative to the arc groove, the outer diameter of the inserted shaft corresponds to the inner diameter of the sleeve, and the inner end of the inserted shaft close to the mounting seat is provided with a circular pad, the diameter of the pad corresponds to the diameter of the valve stem.

8. The automatic press-fit assembly platform for engine exhaust butterfly valves according to claim 7, characterized in that: When the auxiliary cylinder rod is at the top of its stroke, both sides of the mounting seat are respectively provided with material troughs which are arranged in the same direction as the inserted shaft, and the top of the material trough is provided with a notch, the width of the notch is adapted to the diameter of the sleeve, the sleeve in the notch is coaxial with the inserted shaft on both sides of the mounting seat after lifting, and a lower material barrel fixedly mounted relative to it is provided above the notch, the cross-section of the lower material barrel is adapted to a single sleeve, and the outer end of the material trough away from the auxiliary cylinder body is provided with a push column, the lower end of the material trough is provided with a pushing cylinder body, the outer end of the pushing cylinder body is provided with a pushing cylinder rod which is telescopically matched with the pushing cylinder rod, and the pushing cylinder rod is fixedly connected to the outer end of the push column, so that the push column has a horizontal reciprocating stroke relative to the length direction of the material trough, and the stroke length of the reciprocating stroke corresponds to the thickness of a sleeve.

9. The automatic press-fit assembly platform for engine exhaust butterfly valves according to claim 1, characterized in that: A positioning cylinder body is fixed on the base, and 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 located at the upper end of its stroke, the valve stem hole of the clamped valve seat is coaxial with the positioning lever, and the end of the positioning cylinder rod is provided with a positioning piece which is coaxially plugged with the outer end of the upper valve stem hole.

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