Shock-resistant riveting buffer structure

Abstract

The invention discloses an anti-impact riveting buffering structure. Comprising a riveting working head, a buffering mechanism and a riveting driving mechanism. A buffer mechanism is arranged at the rear end of the working head and is staggered with the driving mechanism; the buffer mechanism comprises a mounting seat, a buffer guide pipe, a mounting plate, a guide plate, a forward buffer ring, a reverse buffer ring, a front guide ring and a rear guide ring; the mounting seat is fixed on the driving mechanism and is fixedly provided with a mounting plate and a guide plate respectively; the mounting plate and the guide plate are provided with mounting holes which are coaxially arranged; the front end of the buffer guide pipe and the rear end of the working head are fixedly connected, are coaxially arranged and are mounted in the mounting hole of the guide plate through the front guide ring and the rear guide ring in sequence; and forward and reverse buffer rings are sleeved at the front and rear ends of the mounting plate mounting hole. Riveting work is driven by the screw, the driving oil cylinder and the hollow piston shaft, the driving oil cylinder and the hollow piston shaft are arranged in a staggered mode, the buffering mechanism is arranged at the rear end of the riveting work head, vibration of the riveting work head is effectively reduced, and the service life of the whole riveting device is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of riveting device design, and relates to a riveting device with strong impact resistance, specifically an impact-resistant riveting buffer structure. Background Art

[0002] An electric-hydraulic riveting gun is an efficient and portable riveting tool, which is widely used in various fields requiring riveting operations.

[0003] Chinese application CN115319009A discloses an electric-hydraulic riveting gun. In the electric-hydraulic riveting gun disclosed in this application, the riveting working head and the electric drive unit are in a front-back corresponding relationship, and the riveting working head is directly fixedly connected to the top surface of the hydraulic pump assembly, and the electric drive unit is directly fixedly connected to the back surface of the hydraulic pump assembly. When the riveting working head performs riveting work, vibrations in the front-back direction will be generated, and this vibration is easily transmitted to the hydraulic pump assembly and the electric drive unit, affecting the stability and airtightness of the connections on the hydraulic pump assembly and the electric drive unit, thereby affecting the overall service life of the riveting gun. Summary of the Invention

[0004] The purpose of the present invention is to provide an impact-resistant riveting buffer structure. The present invention uses a screw rod and a misaligned active oil cylinder and a hollow piston shaft to drive the riveting work, and a buffer mechanism is arranged at the rear end of the riveting working head to effectively reduce the vibration of the riveting working head and improve the overall service life of the riveting device.

[0005] The present invention adopts the following solutions:

[0006] An impact-resistant riveting buffer structure, characterized in that: it includes a riveting working head, a buffer mechanism and a riveting drive mechanism; the buffer mechanism is arranged at the rear end of the riveting working head and is misaligned and installed with the drive mechanism through the buffer mechanism;

[0007] The buffer mechanism includes: a mounting seat, a buffer guide tube, a mounting plate, a guide plate, a forward buffer ring, a reverse buffer ring, a front guide ring, and a rear guide ring;

[0008] The mounting seat is fixed to the drive mechanism, and the mounting seat is respectively fixedly provided with a mounting plate and a guide plate; the mounting plate and the guide plate have axially arranged mounting holes; the front end of the buffer guide tube is fixedly connected to the rear end of the riveting working head and is coaxially arranged, and the buffer guide tube is sequentially installed in the mounting hole of the mounting plate through the front guide ring and installed in the mounting hole of the guide plate through the rear guide ring; the buffer guide tube at the front and rear ends of the mounting hole of the mounting plate is respectively sleeved with a forward buffer ring or a reverse buffer ring.

[0009] Furthermore, the mounting base is fixedly arranged on the side of the axial driving structure of the driving mechanism. The mounting plate and the guiding plate are arranged perpendicular to the mounting base. After the buffer guiding tube is installed through the mounting holes of the mounting plate and the guiding plate, the axial working direction formed by the riveting working head is a misaligned structure with the driving mechanism.

[0010] Furthermore, the buffer guiding tube includes: a sealing plate with a flange structure at the front end. Bolt holes are evenly spaced on the sealing plate and are fixed to the rear end of the riveting working head by bolts; a rod portion in the middle that matches the front guiding ring and has a clearance fit; a rod portion at the rear end that matches the rear guiding ring and has a clearance fit.

[0011] Furthermore, the front guiding ring matches the mounting hole of the mounting plate and is connected and fixed to the mounting plate through the mounting holes on the ring surface of the front guiding ring; the axial length of the front guiding ring is greater than the axial length of the mounting hole of the mounting plate.

[0012] Furthermore, the forward buffer ring is arranged between the sealing plate of the buffer guiding tube and the front end face of the front guiding ring, and the reverse buffer ring is arranged on the rear end face of the front guiding ring.

[0013] Furthermore, a retaining ring assembly is arranged at the rear end of the reverse buffer ring; the retaining ring assembly includes an annular retaining ring and a shaft retaining ring. The inner diameter of the annular retaining ring is equal to the outer diameter of the buffer guiding tube, the inner diameter of the shaft retaining ring is smaller than the inner diameter of the annular retaining ring, and an annular groove for the annular retaining ring to be embedded is arranged on the buffer guiding tube.

[0014] Furthermore, the rear guiding ring matches the mounting hole of the guiding plate and is connected and fixed to the guiding plate through the mounting holes on the ring surface of the rear guiding ring; the axial length of the rear guiding ring is greater than the axial length of the mounting hole of the guiding plate.

[0015] Furthermore, an oil inlet and outlet hydraulic oil circuit connecting the riveting working head and the driving mechanism is arranged in the mounting base.

[0016] The beneficial effects of the present invention are as follows:

[0017] Through the arrangement of the mounting base and its buffer structure, when the riveting working head works, the vibrations in the front and rear directions first pass through the shock absorption of the buffer structure and then the vibrations are transmitted to the mounting base, and finally the mounting base transmits the vibrations to the driving devices such as the main oil cylinder of the driving mechanism. Since the spatial arrangement of the mounting base and the main oil cylinder of the driving mechanism is misaligned, the driving mechanism's main oil cylinder, etc. is perpendicular to the vibration direction generated by the riveting working head. During the process of the mounting base transmitting the vibration to the main oil cylinder, the vibration effect is further weakened, reducing the vibration received by the main oil cylinder and the driving device, and prolonging the overall service life of the riveting gun.

[0018] Both the forward buffer ring and the reverse buffer ring provided in the buffer structure of the present invention are made of elastic energy-absorbing materials. Through the arrangement of the forward buffer ring and the reverse buffer ring, the vibration in the front and back directions generated by the riveting working head can be absorbed and attenuated.

[0019] Through the arrangement of the front guide ring and the rear guide ring, the buffer structure of the present invention further improves the stability of the buffer guide tube, can play a guiding role in the axial movement of the guide tube, and further improves the energy absorption and shock absorption effects. Brief Description of the Drawings

[0020] Figure 1 is a schematic three-dimensional structure diagram of the riveting device according to an embodiment of the present invention;

[0021] Figure 2 is a schematic vertical sectional structure diagram of the riveting device according to an embodiment of the present invention passing through the axis of the driven screw;

[0022] Figure 3 is a schematic horizontal sectional structure diagram of the riveting device according to an embodiment of the present invention passing through the axis of the transition joint;

[0023] Figure 4 is a schematic vertical sectional structure diagram of the riveting device according to an embodiment of the present invention passing through the axis of the first oil passage;

[0024] Figure 5 is a schematic vertical sectional structure diagram of the riveting device according to an embodiment of the present invention passing through the axis of the second oil passage;

[0025] Figure 6 is a schematic cross-sectional structure diagram of the buffer structure of the riveting device according to an embodiment of the present invention;

[0026] Figure 7 is a schematic structure diagram of the buffer structure of the riveting device according to an embodiment of the present invention;

[0027] Figure 8 is a schematic structure diagram of the reverse buffer ring of the riveting device according to an embodiment of the present invention;

[0028] Figure 9 is a schematic structure diagram of the forward buffer ring of the riveting device according to an embodiment of the present invention;

[0029] Figure 10 is a schematic structure diagram of the front guide ring of the riveting device according to an embodiment of the present invention;

[0030] Figure 11 is a schematic structure diagram of the rear guide ring of the riveting device according to an embodiment of the present invention;

[0031] Figure 12 is a schematic structure diagram of the mounting seat and the mounting plate of the riveting device according to an embodiment of the present invention;

[0032] Figure 13Schematic cross-sectional structure diagram of the riveting device mounting seat and mounting plate according to an embodiment of the present invention;

[0033] Figure 14 Schematic structure diagram of the guiding tube of the riveting device according to an embodiment of the present invention;

[0034] Figure 15 Schematic structure diagram of the guiding plate of the riveting device according to an embodiment of the present invention;

[0035] Figure 16 Schematic structure diagram of the active oil cylinder housing of the riveting device according to an embodiment of the present invention;

[0036] Figure 17 Schematic structure diagram of the rear end cover of the riveting device according to an embodiment of the present invention;

[0037] Figure 18 Schematic structure diagram of the oil distribution plate of the riveting device according to an embodiment of the present invention;

[0038] Figure 19 Schematic structure diagram of the collar of the riveting device according to an embodiment of the present invention;

[0039] Figure 20 Schematic structure diagram of the transition joint of the riveting device according to an embodiment of the present invention.

[0040] Reference numerals: 1, cylinder block; 2, hollow piston shaft; 3, rear end cover; 4, driven hydraulic cavity; 5, first oil circuit; 6, second oil circuit; 7, mounting seat; 8, first infusion path; 9, second infusion path; 10, active oil cylinder; 11, active piston shaft; 12, active hydraulic cavity; 13, first active oil circuit; 14, second active oil circuit; 15, buffer guiding tube; 16, sealing plate; 17, mounting plate; 18, forward buffer ring; 19, reverse buffer ring; 20, annular retaining ring; 21, shaft circlip; 22, annular groove; 23, guiding plate; 24, front guiding ring; 25, rear guiding ring; 26, transition joint; 27, axial oil passage; 28, radial oil passage; 29, sealing groove; 30, oil distribution plate; 31, limiting outer edge; 32, limiting groove; 33, sealing cavity; 34, driving tube; 35, sealing joint; 36, driven screw; 37, driven gear; 38, driving gear; 39, reducer; 40, motor; 41, collar; 42, anti-rotation force arm; 43, roller; 44, movable groove; 45, position sensor; 46, prism segment; 47, receiving groove; 48, sealing groove; 49, quick lock; 50, gun body thread; 51, gun head thread; 52, oil filling port. Detailed implementation manners

[0041] The present invention will be further described below in conjunction with the specific implementation manners. The specific implementation manners are further explanations of the principles of the present invention and do not limit the present invention in any way. The same or similar technologies to the present invention do not exceed the protection scope of the present invention.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0043] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "provided with", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The anti-impact riveting device of the embodiment of the present invention will be described in detail below.

[0045] The anti-impact riveting device includes a riveting working head. The riveting working head includes a cylinder block 1, a hollow piston shaft 2, and a rear end cover 3. The cylinder block 1 and the rear end cover 3 form a driven hydraulic chamber 4 for the hollow piston shaft 2 to move. A first oil passage 5 connected to the front end of the driven hydraulic chamber 4 and a second oil passage 6 connected to the rear end of the driven hydraulic chamber 4 are provided inside the cylinder block 1. An installation seat 7 is connected to the rear end of the cylinder block 1. A first infusion passage 8 connected to the first oil passage 5 and a second infusion passage 9 connected to the second oil passage 6 are provided inside the installation seat 7. A main cylinder 10 located outside the side of the riveting working head is provided below the installation seat 7. The axis of the riveting working head is arranged parallel to the main cylinder 10. A main piston shaft 11 and a main hydraulic chamber 12 for the main piston shaft 11 to move are provided inside the main cylinder 10. A first main oil passage 13 connected to the first infusion passage 8 and a second main oil passage 14 connected to the second infusion passage 9 are communicated and provided inside the main cylinder 10. The main piston shaft 11 is connected with a driving device, and a buffer structure is provided between the installation seat 7 and the cylinder block 1.

[0046] The opening of the first main oil passage 13 in the main hydraulic chamber 12 is located at the rear end of the main hydraulic chamber 12, and the opening of the second main oil passage 14 in the main hydraulic chamber 12 is located at the front end of the main hydraulic chamber 12.

[0047] Through the setting of the mounting seat 7 and the buffer structure, when the riveting working head works, the vibration in the front-back direction is first absorbed by the buffer structure and then transmitted to the mounting seat 7, and finally transmitted to the main cylinder 10 by the mounting seat 7. Since the spatial arrangement direction of the mounting seat 7 and the main cylinder 10 is perpendicular to the vibration direction generated by the riveting working head, during the process of the mounting seat 7 transmitting the vibration to the main cylinder 10, the vibration effect is further weakened, thereby reducing the vibration received by the main cylinder 10 and the driving device and prolonging the overall service life of the riveting gun. Through the setting of the first liquid delivery path 8, the second liquid delivery path 9, the first main oil path 13, and the second main oil path 14, when the piston in the main cylinder 10 moves, the oil in the main hydraulic chamber 12 can enter and exit the driven hydraulic chamber 4, thereby driving the hollow piston shaft 2 to move back and forth. Through hydraulic power transmission, the vibration generated during the riveting process can be effectively isolated, avoiding a large impact on the driving device.

[0048] The cross-sectional area of the driven hydraulic chamber 4 is larger than that of the main hydraulic chamber 12. Through the design of the dimensional relationship between the cross-sectional area of the driven hydraulic chamber 4 and the cross-sectional area of the main hydraulic chamber 12, the axial force of the driving device on the main piston shaft 11 can be reduced.

[0049] In this embodiment, a buffer guide tube 15 is provided to support the riveting working head and provide sliding guidance for the riveting working head in the axial direction of the riveting working head. A sealing plate 16 for sealing the rear end of the rear end cover 3 is provided on the outer wall of the buffer guide tube 15. The mounting seat 7 includes a mounting plate 17 for the buffer guide tube 15 to pass through. In the state where the buffer guide tube 15 passes through the mounting plate 17, a retaining ring assembly is provided on the side of the buffer guide tube 15 facing away from the cylinder block 1 on the mounting plate 17. The buffer structure includes a forward buffer ring 18 between the mounting plate 17 and the sealing plate 16 and a reverse buffer ring 19 between the mounting plate 17 and the retaining ring assembly. The oil distribution plate 30 is provided with a sealing groove 48 for placing the sealing plate 16 on the side facing the cylinder block. The materials of the forward buffer ring 18 and the reverse buffer ring 19 are both elastic energy-absorbing materials. Through the setting of the forward buffer ring 18 and the reverse buffer ring 19, the vibration in the front-back direction generated by the riveting working head can be absorbed and weakened.

[0050] The retaining ring assembly includes an annular retaining ring 20 and a shaft circlip 21. The inner diameter of the annular retaining ring 20 is equal to the outer diameter of the buffer guide tube 15, that is, in the state where the buffer guide tube 15 is fixed on the mounting plate 17, the outer diameter of the section of the buffer guide tube 15 where the annular retaining ring 20 is located. The outer diameter of the annular retaining ring 20 is greater than the outer diameter of the reverse buffer ring 18. The inner diameter of the shaft circlip 21 is smaller than the inner diameter of the annular retaining ring 20, and the outer diameter of the shaft circlip 21 is greater than the inner diameter of the annular retaining ring 20. An annular groove 22 for the annular retaining ring 20 to be embedded is provided on the buffer guide tube 15. The shaft circlip 21 is in the shape of a major arc. Through the setting of the annular groove 22, the shaft circlip 21 can be embedded, thereby playing a blocking role on the annular retaining ring 20; through the setting of the annular retaining ring 20, it can play a blocking role on the reverse buffer ring 19.

[0051] The mounting seat 7 is installed and fixed with a mounting plate 17 and a guide plate 23 for the buffer guide tube 15 to pass through. The mounting plate 17 is arranged between the cylinder block 1 and the guide plate 23. A front guide ring 24 for the buffer guide tube 15 to pass through is provided on the mounting plate 17. The inner diameter of the front guide ring 24 is equal to the outer diameter of the buffer guide tube 15, that is, in the state where the buffer guide tube 15 is fixed on the mounting plate 17, the outer diameter of the section where the front guide ring 24 is located. The thickness of the front guide ring 24 is greater than the thickness of the mounting plate 17; a rear guide ring 25 for the buffer guide tube 15 to pass through is provided on the guide plate 23. The inner diameter of the rear guide ring 25 is equal to the outer diameter of the buffer guide tube 15, that is, in the state where the buffer guide tube 15 is fixed on the guide plate 23, the outer diameter of the section where the rear guide ring 25 is located. The thickness of the rear guide ring 25 is greater than the thickness of the guide plate 23. The guide plate 23 is connected to the mounting seat 7 by bolts, the front guide ring 24 is connected to the mounting plate 17 by bolts, and the rear guide ring 25 is connected to the guide plate 23 by bolts. Through the setting of the front guide ring 24 and the rear guide ring 25, it can play a guiding role in the axial movement of the buffer guide tube 15.

[0052] The buffer structure of this embodiment further includes two transition joints 26. The front and rear ends of each transition joint 26 are respectively embedded into the cylinder block 1 and the mounting seat 7. The front and rear ends of one transition joint 26 are respectively communicated with the first oil passage 5 and the first infusion passage 8, and the front and rear ends of the other transition joint 26 are respectively communicated with the second oil passage 6 and the second infusion passage 9. Through the setting of the transition joint 26, the oil passage inside the cylinder block 1 can be communicated with the oil passage inside the mounting seat 7.

[0053] An axial oil passage 27 extending along the axis of the adapter joint 26 and a radial oil passage 28 extending along the radius of the adapter joint 26 are provided inside the adapter joint 26. The axial oil passage 27 is in communication with the radial oil passage 28. The axial oil passage 27 has an opening at one end facing the cylinder block 1, and the radial oil passage 28 has an opening at one end facing the side wall of the adapter joint 26. A plurality of radial oil passages 28 are provided around the axial oil passage. The axial oil passage 27 is used to communicate with the first oil passage 5 or the second oil passage 6, and the radial oil passage 28 is used to communicate with the first infusion passage 8 or the second infusion passage 9. Through the arrangement of the axial oil passage 27 and the radial oil passage 28, the axial oil passage 28 can be communicated with the first oil passage 5 or the second oil passage 6, and the radial oil passage 28 can be communicated with the first infusion passage 8 or the second infusion passage 9.

[0054] At the opening of the radial oil passage 27 on the side wall of the adapter joint 26, an annular sealing groove 29 for placing a sealing ring is provided on each of the front and rear sides along the axis of the adapter joint 26. Through the arrangement of the sealing groove 29, sealing rings can be provided on the front and rear sides of the opening of the radial oil passage 27 on the adapter joint 26, so that a sealed space is formed between the two sealing rings, avoiding oil leakage near the opening of the radial oil passage 27 on the adapter joint 26.

[0055] The rear end of the cylinder block 1 is sealingly connected to an oil distribution plate 30. The transition joint 26 is made of an elastic material. A limiting outer edge is provided on the end face of the transition joint 26 facing the cylinder block. A limiting groove 32 for placing the limiting outer edge 31 is provided on the side of the oil distribution plate 30 facing away from the mounting seat 7. A sealing cavity 33 for placing a sealing ring corresponding to the axial oil passage 28 is provided at one end of the rear end cover 3 facing the oil distribution plate 30. The outer diameter of the sealing ring is smaller than the outer diameter of the limiting outer edge 31. A receiving groove 47 for receiving the transition joint 26 is provided on the mounting seat 7. When the riveting working head is in the working state, the length of the transition joint 26 in the receiving groove 47 is always less than the depth of the receiving groove 47. The openings of the first infusion passage 8 or the second infusion passage 9 on the side wall of the receiving groove 47 are always located between the two sealing grooves 29 on the transition joint 26 in the receiving groove 47. The oil distribution plate 30 and the cylinder block 1 are connected by bolts. The mounting seat 7 is provided with a vent hole at the bottom end of the sealing groove 29 for communicating the two sealing grooves 29 with the outside of the mounting seat 7. Through the setting of the vent hole, it is possible to prevent the transition joint 26 from forming a sealed cavity with the bottom end of the sealing groove 29, thereby avoiding the phenomenon that the movement of the transition joint 26 into the receiving groove 47 is hindered due to excessive pressure in the receiving groove 47. Through the design of the oil distribution plate 30 and the limiting outer edge 31, the transition joint 26 can be fixed on the cylinder block 1. At the same time, through the setting of the length of the receiving groove 47, the transition joint 26 has a margin for further in-depth movement in the receiving groove 47. When the riveting working head generates vibrations in the front-rear direction, the transition joint 26 can move back and forth in the receiving groove 47, thereby preventing the vibrations transmitted from the riveting working head to the transition joint 26 from being transmitted to the receiving groove 47. Through the design of the spatial position relationship between the opening position of the first infusion passage 8 or the second infusion passage 9 on the side wall of the receiving groove 47 and the two sealing grooves 29 on the transition joint 26 in the receiving groove 47, when the transition joint 26 moves back and forth in the receiving groove 47, the radial oil passage 27 can always be kept in communication with the first infusion passage 8 or the second infusion passage 9.

[0056] The drive device includes a drive pipe 34. The drive pipe 34 includes a sealing joint 35. The sealing joint 35 is sealingly connected to the active oil cylinder 10, and the active piston shaft 11 passes through the sealing joint 35. One end of the active piston shaft 11 facing the drive pipe 34 is connected with a driven screw 36. A driven gear 37 is coaxially thread-connected to the driven screw 36. One end of the driven screw 36 facing the active piston shaft 11 is provided with a prism section 46 whose outer surface is prism-shaped. A collar 41 is sleeved on the prism section 46. Anti-rotation force arms 42 extending radially along the collar 41 are provided on opposite sides of the collar 41. Rollers 43 are sleeved on the anti-rotation force arms 42. An activity groove 44 for placing the rollers 43 and extending along the axial direction of the drive pipe 34 is provided on the side wall of the drive pipe 34. The driven gear 37 is meshed and connected with a driving gear 38. A speed reducer 39 is coaxially connected to the driving gear 38, and a motor 40 is coaxially connected to the speed reducer 39. At least two sealing rings are provided between the sealing joint 35 and the active piston shaft 11. The driven screw 36 and the driven gear 37 are coaxially arranged. The inner through hole of the collar 41 is prism-shaped with a shape and size corresponding to the outer surface of the prism section 46. Through the settings of the motor 40, the speed reducer 39, the driving gear 38, the driven gear 37, the driven screw 36, the prism section 37, and the anti-rotation force arm 42, with the motor 40 as the power source, after being decelerated by the speed reducer 39, the driving gear 38 is driven to drive the driven gear 37 to rotate. Since the driven screw 36 is thread-connected to the driven gear 37, and the anti-rotation force arm 42 is provided on the driven screw 36, during the rotation of the driven gear 37 around the axis of the driven screw 36, the driven screw 36 does not rotate around the axis of the driven screw 37, but can only make a reciprocating motion along the axis of the driven screw 37, thereby driving the active piston shaft 11 to make a reciprocating motion along the axial direction of the driven screw 37, causing the oil pressure at the front and rear ends in the active hydraulic cavity 12 to change.

[0057] The driven screw 36 adopts a ball screw. Position sensors 45 are penetrated and arranged at the head and tail ends of the activity groove 44 on the drive pipe 34. The position sensors 45 are electrically connected to the motor 40. Through the setting of the position sensors 45, the position of the collar 41 in the drive pipe 34 can be detected. When the collar 41 reaches the end of the activity groove 44, the position sensors 45 transmit the in-place signal to the motor 40, avoiding the motor 40 from continuing to drive the driven screw 36 to move in the original direction and thus generating an ineffective load.

[0058] The mounting seat 7 is connected to the outer wall of the active oil cylinder 10 by bolts. Two oil filling ports 52 are provided on the mounting seat 7. One of the oil filling ports 52 is communicated with the first infusion line 8, and the other oil filling port 52 is communicated with the second infusion line 9. An oil filling plug is provided on each oil filling port 52. Through the setting of the oil filling ports 52, when the oil volume in the driven hydraulic cavity 4 or the active hydraulic cavity 12 is lost as the piston moves, the oil can be supplemented through the oil filling ports 52.

[0059] Embodiment 1

[0060] An impact-resistant riveting device in this embodiment, as Figure 1 、 Figure 2 shown, includes a riveting working head, which includes a cylinder block 1, a hollow piston shaft 2, and a rear end cover 3. The cylinder block 1 and the rear end cover 3 form a driven hydraulic cavity 4 for the hollow piston shaft 2 to move.

[0061] As Figure 3 shown, a first oil passage 5 communicating with the front end of the driven hydraulic cavity 4 and a second oil passage 6 communicating with the rear end of the driven hydraulic cavity 4 are arranged inside the cylinder block 1, and a mounting seat 7 is connected to the rear end of the cylinder block 1.

[0062] As Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 12 、 Figure 13 shown, a first liquid delivery passage 8 communicating with the first oil passage 5 and a second liquid delivery passage 9 communicating with the second oil passage 6 are arranged inside the mounting seat 7. A driving oil cylinder 10 is arranged below the mounting seat 7 and outside the side of the riveting working head. A driving piston shaft 11 and a driving hydraulic cavity 12 for the driving piston shaft 11 to move are arranged inside the driving oil cylinder 10; as Figure 4 、 Figure 5 shown, a first driving oil passage 13 communicating with the first liquid delivery passage 8 and a second driving oil passage 14 communicating with the second liquid delivery passage 9 are arranged inside the driving oil cylinder 10 in a communicating way. The driving piston shaft 11 is connected with a driving device, and a buffer structure is arranged between the mounting seat 7 and the cylinder block 1. The opening of the first driving oil passage 13 in the driving hydraulic cavity 12 is located at the rear end of the driving hydraulic cavity 12, and the opening of the second driving oil passage 14 in the driving hydraulic cavity 12 is located at the front end of the driving hydraulic cavity 12. The outer walls of the mounting seat 7 and the driving oil cylinder 10 are connected by bolts. As Figure 12 、 Figure 13 shown, two oil replenishing ports are arranged on the mounting seat 7. One oil replenishing port communicates with the first liquid delivery passage 8, and the other oil replenishing port communicates with the second liquid delivery passage 9. An oil replenishing plug is arranged on each oil replenishing port. Through the arrangement of the oil replenishing ports, when the oil quantity in the driven hydraulic cavity 4 or the driving hydraulic cavity 12 is lost as the piston moves, the oil can be replenished through the oil replenishing ports.

[0063] As Figure 6 、 Figure 7 、 Figure 12 、 Figure 13As shown, through the setting of the mounting base 7 and the buffer structure, when the riveting working head works, the vibration in the front-back direction generated is first absorbed by the buffer structure and then transmitted to the mounting base 7, and finally transmitted by the mounting base 7 to the driving oil cylinder 10. Since the spatial arrangement direction of the mounting base 7 and the driving oil cylinder 10 is perpendicular to the vibration direction generated by the riveting working head, during the process of the mounting base 7 transmitting the vibration to the driving oil cylinder 10, the vibration effect is further weakened, thereby reducing the vibration received by the driving oil cylinder 10 and the driving device, and prolonging the overall service life of the riveting gun; through the setting of the first liquid delivery path 8, the second liquid delivery path 9, the first active oil path 13, and the second active oil path 14, when the piston in the driving oil cylinder 10 moves, the oil in the active hydraulic cavity 12 can enter and exit the driven hydraulic cavity 4, thereby driving the hollow piston shaft 2 to move back and forth; through hydraulic power transmission, the vibration generated during the riveting process can be effectively isolated, avoiding a large impact on the driving device.

[0064] As Figure 2 shown, the cross-sectional area of the driven hydraulic cavity 4 is larger than that of the active hydraulic cavity 12. Its function is that through the design of the dimensional relationship between the cross-sectional area of the driven hydraulic cavity 4 and the cross-sectional area of the active hydraulic cavity 12, the axial force of the driving device on the active piston shaft 11 can be reduced.

[0065] As Figure 2 , Figure 6 , Figure 7 , Figure 12 , Figure 13 , Figure 15 shown, the riveting working head includes a guiding tube 15 for supporting the riveting working head and providing sliding guidance for the riveting working head in the axial direction of the riveting working head. A sealing plate 16 for sealing the rear end of the rear end cover 3 is provided on the outer wall of the buffer guiding tube 15. The mounting base 7 includes a mounting plate 17 for the buffer guiding tube 15 to pass through. In the state where the buffer guiding tube 15 passes through the mounting plate 17, a retaining ring assembly is provided on the side of the buffer guiding tube 15 facing away from the cylinder block 1 and located on the mounting plate 17.

[0066] As Figure 8 , Figure 9 , Figure 12 , Figure 13 shown, the buffer structure includes a forward buffer ring 18 located between the mounting plate 17 and the sealing plate 16 and a reverse buffer ring 19 located between the mounting plate 17 and the retaining ring assembly. An oil distribution plate 30 is provided with a sealing groove 48 for placing the sealing plate 16 on the side facing the cylinder block 1. The materials of the forward buffer ring 18 and the reverse buffer ring 19 are both made of elastic energy-absorbing materials. Its function is that through the setting of the forward buffer ring 18 and the reverse buffer ring 19, the vibration in the front-back direction generated by the riveting working head can be absorbed and weakened.

[0067] As Figure 2As shown in the figure, the retaining ring assembly includes an annular retaining ring 20 and a shaft circlip 21; the inner diameter of the annular retaining ring 20 is equal to the outer diameter of the buffer guide tube 15, that is, in the state where the buffer guide tube 15 is fixed to the mounting seat 7, the outer diameter of the section of the guide tube 15 where the annular retaining ring 20 is located; the outer diameter of the annular retaining ring 20 is greater than the outer diameter of the reverse buffer ring 19, the inner diameter of the shaft circlip 21 is smaller than the inner diameter of the annular retaining ring 20, the outer diameter of the shaft circlip 21 is greater than the inner diameter of the annular retaining ring 20, and an annular groove 22 for embedding the annular retaining ring 20 is provided on the guide tube 15. The shaft circlip 21 is in the shape of a superior arc. Through the setting of the annular groove 22, the shaft circlip 21 can be embedded, so as to block the annular retaining ring 20; through the setting of the annular retaining ring 20, the reverse buffer ring 19 can be blocked.

[0068] As Figure 2 , Figure 10 , Figure 11 shown in the figure, the mounting seat 7 includes a guide plate 23 for the buffer guide tube 15 to pass through, a mounting plate 17 is arranged between the cylinder block 1 and the guide plate 23, and a front guide ring 24 for the buffer guide tube 15 to pass through is connected and arranged on the mounting plate 17. The inner diameter of the front guide ring 24 is equal to the outer diameter of the buffer guide tube 15, that is, in the state where the buffer guide tube 15 is fixed to the mounting seat 7, the outer diameter of the section where the front guide ring 24 is located, the thickness of the front guide ring 24 is greater than the thickness of the mounting plate 17, and a rear guide ring 25 for the buffer guide tube 15 to pass through is connected to the guide plate 23. The inner diameter of the rear guide ring 25 is equal to the outer diameter of the buffer guide tube 15, that is, in the state where the buffer guide tube 15 is fixed to the mounting seat 7, the outer diameter of the section where the rear guide ring 25 is located, and the thickness of the rear guide ring 25 is greater than the thickness of the guide plate 23. The guide plate 23 and the mounting seat 7 are connected by bolts, the front guide ring 24 and the mounting plate 17 are connected by bolts, and the rear guide ring 25 and the guide plate 23 are connected by bolts. Through the setting of the front guide ring 24 and the rear guide ring 25, the axial movement of the buffer guide tube 15 can be guided.

[0069] As Figure 2 , Figure 6 , Figure 7 shown in the figure, the buffer structure further includes two transition joints 26. The front and rear ends of each transition joint 26 are respectively embedded in the cylinder block 1 and the mounting seat 7. The front and rear ends of one transition joint 26 are respectively connected and communicated with the first oil passage 5 and the first infusion passage 8, and the front and rear ends of the other transition joint 26 are respectively connected and communicated with the second oil passage 6 and the second infusion passage 9. Its function is that through the setting of the transition oil passage, the oil passage inside the cylinder block 1 can be connected and communicated with the oil passage inside the mounting seat 7.

[0070] As Figure 20As shown, an axial oil passage 27 extending along the axis of the adapter 26 and a radial oil passage 28 extending along the radius of the adapter 26 are provided inside the adapter 26. The axial oil passage 27 communicates with the radial oil passage 28. One end of the axial oil passage 27 opens towards the cylinder block 1, and one end of the radial oil passage 28 opens towards the side wall of the adapter 26. A plurality of radial oil passages 28 are arranged around the axial oil passage 27. The axial oil passage 27 is used to communicate with the first oil passage 5 or the second oil passage 6, and the radial oil passage 28 is used to communicate with the first infusion passage 8 or the second infusion passage 9. Its function is that through the arrangement of the axial oil passage 27 and the radial oil passage 28, the axial oil passage 27 can communicate with the first oil passage 5 or the second oil passage 6, and the radial oil passage 28 can communicate with the first infusion passage 8 or the second infusion passage 9.

[0071] As Figure 20 shown, at the opening of the radial oil passage 28 on the side wall of the adapter 26, an annular sealing groove 29 for placing a sealing ring is provided on each of the front and rear sides along the axis of the adapter 26. Its function is that through the arrangement of the sealing groove 29, sealing rings can be provided on the front and rear sides of the opening of the radial oil passage 28 on the adapter 26, so as to form a sealed space between the two sealing rings, avoiding oil leakage near the opening of the radial oil passage 28 on the adapter 26.

[0072] As Figure 2 、 Figure 18As shown, a distribution plate 30 is hermetically connected to the rear end of the cylinder block 1. The transition joint 26 is made of an elastic material. A limiting outer edge 31 is provided on the end face of the transition joint 26 facing the cylinder block 1. A limiting groove 32 for placing the limiting outer edge 31 is provided on the side of the distribution plate 30 facing away from the mounting seat 7. A sealing cavity 33 for placing a sealing ring corresponding to the axial oil passage 27 is provided at one end of the rear end cover 3 facing the distribution plate 30. The outer diameter of the sealing ring is smaller than the outer diameter of the limiting outer edge 31. A receiving groove 47 for accommodating the transition joint 26 is provided on the mounting seat 7. When the riveting working head is in the working state, the length of the transition joint 26 in the receiving groove 47 is always less than the depth of the receiving groove 47. The openings of the first infusion path 8 or the second infusion path 9 on the side wall of the receiving groove 47 are always located between the two sealing grooves 29 on the transition joint 26 in the receiving groove 47. The distribution plate 30 and the cylinder block 1 are connected by bolts. Its function is that through the design of the distribution plate 30 and the limiting outer edge 31, the transition joint 26 can be fixed on the cylinder block 1. At the same time, through the setting of the length of the receiving groove 47, the transition joint 26 has a margin for further in-depth movement in the receiving groove 47. When the riveting working head generates vibrations in the front-back direction, the transition joint 26 can move back and forth in the receiving groove 47, thereby preventing the vibrations transmitted from the riveting working head to the transition joint 26 from being transmitted to the receiving groove 47. Through the design of the spatial position relationship between the opening position of the first infusion path 8 or the second infusion path 9 on the side wall of the receiving groove 47 and the two sealing grooves 29 on the transition joint 26 in the receiving groove 47, when the transition joint 26 moves back and forth in the receiving groove 47, the radial oil passage 28 can always be kept in communication with the first infusion path 8 or the second infusion path 9.

[0073] As Figure 2 shown, the driving device includes a driving tube 34. The driving tube 34 includes a sealing joint 35. The sealing joint 35 is hermetically connected to the active oil cylinder 10 and the active piston shaft 11 passes through the sealing joint 35. A driven screw 36 is connected to one end of the active piston shaft 11 facing the driving tube 34. A driven gear 37 is coaxially thread-connected to the driven screw 36. A prismatic section 46 with a prismatic outer surface is provided at one end of the driven screw 36 facing the active piston shaft 11. A collar 41 is sleeved on the prismatic section 46. As Figure 7As shown, anti-rotation force arms 42 extending radially along the collar 41 are arranged on opposite sides of the collar 41. Rollers 43 are sleeved on the anti-rotation force arms 42. An activity groove 44 extending axially along the driving tube 34 for placing the rollers 43 is arranged on the side wall of the driving tube 34. The driven gear 37 is meshed and connected with a driving gear 38. A speed reducer 39 is coaxially connected to the driving gear 38. A motor 40 is coaxially connected to the speed reducer 39. Through the arrangement of the rollers 43, it is convenient for the anti-rotation force arms 42 on the collar 41 to move in the activity groove 44. At least two sealing rings are arranged between the sealing joint 35 and the active piston shaft 11. The driven screw 36 is coaxially arranged with the driven gear 37. The internal through hole of the collar 41 is prism-shaped with a shape and size corresponding to the outer surface of the prism section 46. The speed reducer 39 and the motor 40 are prior arts themselves and will not be elaborated. Their function is that with the motor 40 as the power source, after being decelerated by the speed reducer 39, the driving gear 38 is driven to drive the driven gear 37 to rotate. Since the driven screw 36 is threadedly connected with the driven gear 37 and the anti-rotation force arm 42 is arranged on the driven screw 36, during the rotation of the driven gear 37 around the axis of the driven screw 36, the driven screw 36 does not rotate around its own axis and can only make a reciprocating motion along the axis of the driven screw 36, thereby driving the active piston shaft 11 to make a reciprocating motion along the axis of the driven screw 36, so that the oil pressure at the front and rear ends in the active hydraulic chamber 12 changes.

[0074] As Figure 2 shown, the driven screw 36 is a ball screw. Position sensors 45 are arranged through the driving tube 34 at the head and tail ends of the activity groove 44. The position sensors 45 are electrically connected with the motor 40. Their function is that through the arrangement of the position sensors 45, the position of the collar 41 in the driving tube 34 can be detected. When the collar 41 reaches the end of the activity groove 44, the position sensors 45 transmit the in-place signal to the motor 40, preventing the motor 40 from continuing to drive the driven screw 36 to move in the original direction and thus generating an ineffective load.

[0075] The working principle of this embodiment is described as follows: In this embodiment, the motor 40 is used as the power source to drive the active piston shaft 11 to reciprocate. During the process that the forward rotation of the motor 40 drives the active piston shaft 11 to move away from the driven gear 37 in the active hydraulic chamber 12, the hydraulic oil at the front end of the active hydraulic chamber 12 sequentially passes through the second active oil passage 14, the second liquid delivery passage 9, the radial oil passage 28, the axial oil passage 27, and the second oil passage 6 and enters the rear end of the driven hydraulic chamber 4, pushing the hollow piston shaft 2 to move forward. The hydraulic oil at the front end of the driven hydraulic chamber 4 is extruded by the hollow piston shaft 2 and sequentially passes through the first oil passage 5, the axial oil passage 27, the radial oil passage 28, the first liquid delivery passage 8, and the first active oil passage 13 and enters the rear end of the active hydraulic chamber 12. During the process that the reverse rotation of the motor 40 drives the active piston shaft 11 to move towards the driven gear 37 in the active hydraulic chamber 12, the moving route of the hydraulic oil is opposite to the above route.

[0076] This embodiment eliminates the piston pump composed of an oil suction check valve, a pressure oil check valve, and a pressure oil plunger in the conventional hydraulic system, does not require a directional control valve with a complex structure and high cost, and can also eliminate the pressure limiting valve of the hydraulic system, making the structure of the power part simpler;

[0077] Since components sensitive to hydraulic oil such as the directional control valve are removed from the hydraulic power part, the requirements for the quality and viscosity of the hydraulic oil are reduced, and it can be applied under a wider ambient temperature condition. While for the conventional hydraulic system, the viscosity of the hydraulic oil at high temperature and the oil suction capacity of the piston pump at low temperature must be considered. For this kind of structure, as long as the hydraulic oil still has good fluidity, it can work normally; when the oil volume in the cavity is sufficient, complex maintenance work such as replacing the hydraulic oil does not need to be considered, and only replenishment is needed after the hydraulic oil is consumed;

[0078] Due to the use of the equal volume principle, it is not necessary to supply oil to the fuel tank additionally during each stroke. At the same time, for this kind of equal volume structure, the hydraulic oil only moves in the connected cavities along their respective pipelines, generating less heat, and there is no need to specially dissipate heat from the hydraulic system.

Claims

1. An impact-resistant riveting buffer structure, characterized in that: It includes a riveting working head, a buffer mechanism, and a riveting driving mechanism; a buffer mechanism is arranged at the rear end of the riveting working head, and is installed in a misaligned manner with the driving mechanism through the buffer mechanism; The buffer mechanism includes: a mounting seat (7), a buffer guide tube (15), a mounting plate (17), a guide plate (23), a forward buffer ring (18), a reverse buffer ring (19), a front guide ring (24), and a rear guide ring (25); The mounting seat (7) is fixed on the driving mechanism, and the mounting seat (7) is respectively fixedly provided with a mounting plate (17) and a guide plate (23); the mounting plate (17) and the guide plate (23) have coaxially arranged mounting holes; the front end of the buffer guide tube (15) is fixedly connected to the rear end of the riveting working head and is coaxially arranged. The buffer guide tube (15) is sequentially installed in the mounting hole of the mounting plate (17) through the front guide ring (24) and in the mounting hole of the guide plate (23) through the rear guide ring (25); the buffer guide tube (15) at the front and rear ends of the mounting hole of the mounting plate (17) is respectively sleeved with a forward buffer ring (18) or a reverse buffer ring (19).

2. The anti-impact riveting buffer structure according to claim 1, wherein: The mounting seat (7) is fixedly arranged on the side of the axial driving structure of the driving mechanism. The mounting plate (17) and the guide plate (23) are perpendicular to the mounting seat (7). After the buffer guide tube (15) is installed through the mounting holes of the mounting plate (17) and the guide plate (23), the axial working direction formed with the riveting working head is a misaligned structure with the driving mechanism.

3. The anti-impact riveting buffer structure according to claim 2, wherein: The buffer guide tube (15) includes: a sealing plate (16) with a flange structure at the front end. The sealing plate (16) is evenly spaced with bolt holes and is fixed to the rear end of the riveting working head by bolts; the middle part has a rod portion matching the front guide ring (24) and is in clearance fit; the rear end has a rod portion matching the rear guide ring (25) and is in clearance fit.

4. The anti-impact riveting buffer structure according to claim 3, characterized in that: The front guide ring (24) matches the mounting hole of the mounting plate (17) and is fixedly connected to the mounting plate (17) through the mounting hole on the ring surface of the front guide ring (24); the axial length of the front guide ring (24) is greater than the axial length of the mounting hole of the mounting plate (17).

5. The anti-impact riveting buffer structure according to claim 4, characterized in that: The forward buffer ring (18) is arranged between the sealing plate (16) of the buffer guide tube (15) and the front end face of the front guide ring (24), and the reverse buffer ring (19) is arranged at the rear end face of the front guide ring (24).

6. The anti-impact riveting buffer structure according to claim 5, characterized in that: A retaining ring assembly is arranged at the rear end of the reverse buffer ring (19); the retaining ring assembly includes an annular retaining ring (20) and a shaft-use elastic retaining ring (21). The inner diameter of the annular retaining ring (20) is equal to the outer diameter of the buffer guide tube (15), and the inner diameter of the shaft-use elastic retaining ring (21) is smaller than the inner diameter of the annular retaining ring (20). An annular groove (22) for embedding the annular retaining ring (20) is arranged on the buffer guide tube (15).

7. The anti-impact riveting buffer structure according to claim 3, characterized in that: The rear guide ring (25) matches the mounting hole of the guide plate (23) and is fixedly connected to the guide plate (23) through the mounting hole on the ring surface of the rear guide ring (25); the axial length of the rear guide ring (25) is greater than the axial length of the mounting hole of the guide plate (23).

8. The anti-impact riveting buffer structure according to claim 3, wherein: Hydraulic oil inlet and outlet oil paths connecting the riveting working head and the driving mechanism are arranged in the mounting seat (7).

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