Buffering device of hydraulic hand riveter

Abstract

The utility model discloses a buffer device of a hydraulic hand riveter, the hydraulic hand riveter comprises a driver and a connecting rod, the buffer device comprises a riveting screw rod and an elastic piece, one end of the elastic piece is connected with the connecting rod, the other end of the elastic piece is connected with the riveting screw rod, and the driver drives the connecting rod to rotate so as to drive the elastic piece to rotate. And the elastic piece drives the riveting screw rod to slide up and down. The rotating speed of the connecting rod can be buffered, the riveting quality is guaranteed, and the structure is simple.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of pull riveter, especially relates to a buffer device of hydraulic pull riveter. BACKGROUND

[0002] The pull riveter is used for fastening riveting of various metal plates, pipe materials and other manufacturing industries, and is widely used in the riveting of electromechanical and light industrial products such as elevators, switches, instruments, furniture and decoration, and can rivet the pull rivet products without needing to attack internal threads and weld nuts.

[0003] The pull riveter usually comprises a driver, a connecting rod and a pull rivet screw rod, the driver is connected with the connecting rod, and the connecting rod is connected with the pull rivet screw rod. The driver drives the connecting rod to rotate at high speed, so as to drive the pull rivet screw rod to rotate and complete the operations of nailing, pull riveting and rivet withdrawing. However, the faster the rotation speed is, the greater the riveting tension is, when the riveting tension exceeds the preset tension, the rivet will be pulled out and quality problems will be caused. A speed reducer is usually arranged between the connecting rod and the pull rivet nut to match the preset tension, but this speed reducing mode leads to the complex structure of the pull riveter, the convenience of maintenance and the increase of the weight of the pull riveter. SUMMARY

[0004] In view of the defects in the prior art, the utility model provides a buffer device of hydraulic pull riveter, which buffers the rotating speed of the connecting rod and guarantees the quality of pull riveting.

[0005] The utility model discloses the following technical scheme:

[0006] A buffer device of hydraulic pull riveter, wherein the hydraulic pull riveter comprises a driver and a connecting rod, the buffer device comprises a pull rivet screw rod and an elastic piece, one end of the elastic piece is connected with the connecting rod, the other end is connected with the pull rivet screw rod, the driver drives the connecting rod to rotate, so as to drive the elastic piece to rotate, and the elastic piece drives the pull rivet screw rod to slide up and down.

[0007] Further, one end of the connecting rod close to the buffer device is provided with a third boss, one end of the elastic piece is connected with the third boss, and the other end is connected with the upper end face of the pull rivet screw rod.

[0008] Further, the bottom of the connecting rod is fixedly connected with a bolt, the third boss is installed on the bolt, and the upper end of the elastic piece is connected between the third boss and the lower end face of the connecting rod.

[0009] Further, the buffer device further comprises a connecting sleeve, the elastic piece is accommodated in the connecting sleeve, one end of the connecting sleeve is rotatably sleeved on the connecting rod, the other end is slidably sleeved on the pull rivet screw rod, and the third boss is accommodated in the connecting sleeve.

[0010] Further, the third boss is in the shape of a strip, and the two ends of the third boss are provided with arc faces, and the arc faces abut against the inner wall of the connecting sleeve.

[0011] Further, the buffer device further comprises a pin rod, the pull rivet screw is provided with a first through hole, the connecting sleeve is provided with a pair of waist-shaped through holes which are symmetrical along the axis of the pull rivet screw, and the pin rod is accommodated in the first through hole and the two ends of the pin rod are accommodated in the pair of waist-shaped through holes respectively.

[0012] Further, the pin rod is in clearance fit with the pull rivet screw.

[0013] Further, the buffer device further comprises a snap spring, the snap spring is sleeved on the connecting sleeve and is in clamping connection with the pin rod.

[0014] Further, the two ends of the pin rod are provided with arc-shaped grooves respectively, and the snap spring is detachably clamped in the arc-shaped grooves.

[0015] Further, the snap spring is made of spring steel and is provided with a notch for dismounting.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] 1. By arranging the elastic element between the connecting rod and the pull rivet screw, the high-speed rotation of the connecting rod driven by the driver is buffered, so that the speed is reduced, the quality of the pull riveting is ensured, and the elastic element is arranged to replace the speed reducer, so that the structure is simple, and the weight of the hydraulic pull riveting gun is reduced.

[0018] 2. When the rivet on the pull riveting gun rotates, a downward pressure is applied to the rivet, the pin rod is inserted in the pull rivet screw, the two ends of the pin rod are accommodated in the waist-shaped through holes of the connecting sleeve, and the pin rod abuts against the waist-shaped through holes, so that the downward pressure of the pull rivet screw is ensured.

[0019] 3. By arranging the snap spring, the pin rod is prevented from being thrown out of the pull rivet screw when the pull rivet screw rotates, and the smooth pull riveting work is ensured. DRAWINGS

[0020] Figure 1 It is a left view of the utility model hydraulic pull riveting gun;

[0021] Figure 2 It is Figure 1 It is a sectional view along A-A;

[0022] Figure 3 It is Figure 2 It is an enlarged view of B;

[0023] Figure 4 It is an explosion view of the sealing device;

[0024] Figure 5 It is Figure 2 It is another enlarged view of B;

[0025] Figure 6Assembly view of the buffer device

[0026] Figure 7 Assembly view of the buffer device

[0027] Figure 8 For Figure 2 Enlarged view of the middle C

[0028] Figure 9 Assembly view of the buffer device

[0029] In the figure: 1, first sealing assembly; 10, first main sealing piece; 11, first auxiliary sealing piece; 12, third sealing piece; 2, second sealing assembly; 20, second main sealing piece; 21, second auxiliary sealing piece; 3, third sealing assembly; 30, first static sealing piece; 31, second static sealing piece; 4, piston; 40, first outer part; 41, second outer part; 43, first bearing groove; 44, second bearing groove; 45, third bearing groove; 450, first groove surface; 48, second accommodating cavity; 49, second ring groove; 5, pressure ring; 52, body; 53, second boss; 6, cylinder; 60, first inner wall; 61, second inner wall; 68, first accommodating cavity; 69, first ring groove; 70, first guide element; 71, second guide element; 72, dustproof element; 80, hydraulic oil pipe; 800, oil cavity; 81, driver; 82, connecting rod; 820, first outer wall; 821, second outer wall; 822, first end surface; 823, second end surface; 825, first boss; 826, third ring groove; 83, pull rivet screw; 830, connecting sleeve; 831, pin rod; 832, clamping spring; 833, elastic element; 834, first through hole; 835, waist-shaped through hole; 836, arc-shaped groove; 837, third boss; 838, notch; 839, third accommodating cavity; 84, first bearing; 840, first inner ring; 841, first outer ring; 845, arc-shaped surface; 846, bolt; 85, second bearing; 850, second inner ring; 851, second outer ring; 86, third bearing; 860, third inner ring; 861, third outer ring; 87, grommet; 870, fourth boss; 88, limiting element; 89, locking element; G, radial; 90, first recess; 91, second recess; 92, third recess; 93, fourth recess; 94, fifth recess; 95, sixth recess; 96, seventh recess; 97, eighth recess; 98, ninth recess; 99, tenth recess. DETAILED DESCRIPTION

[0030] The following detailed, non-limiting description of the utility model's technical solution, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0031] like Figure 1 and Figure 2 As shown, a hydraulic riveting gun according to an embodiment of the present invention includes a piston 4, a pressure ring 5, a cylinder 6, a hydraulic oil pipe 80, a driver 81, a connecting rod 82, and a riveting screw 83. The connecting rod 82 is housed within the piston 4, with one end connected to the driver 81 and the other end connected to the riveting screw 83. The pressure ring 5 is sleeved on the piston 4 and housed within the cylinder 6. An oil passage (not shown) is provided on the cylinder 6, communicating with the gap between the piston 4 and the pressure ring 5. The hydraulic oil pipe 80 is installed in the oil passage. The piston 4 is slidably housed within the cylinder 6, and the pressure ring 5 is housed at one end of the cylinder 6 and sleeved on the piston 4, forming an oil cavity 800 for accommodating hydraulic oil between the piston 4 and the pressure ring 5. The piston 4 is slidably sleeved on the connecting rod 82, which is fixedly connected to the riveting screw 83. The driver 81 drives the connecting rod 82 to rotate within the piston 4, thereby rotating the riveting screw 83 to complete the riveting process.

[0032] The pressure ring 5 includes a body 52, the outer wall of which abuts against the inner wall of the cylinder 6, and the inner wall of the body 52 abuts against the outer wall of the piston 4. The pressure ring 5 also includes a second boss 53 that protrudes outward relative to the body 52, and the second boss 53 is fixedly connected to the bottom of the cylinder 6.

[0033] Specifically, the first accommodating cavity 68 is formed in the cylinder body 6, the piston 4 is accommodated in the first accommodating cavity 68 and abuts against the first inner wall 60 of the first accommodating cavity 68. The first inner wall 60 of the first accommodating cavity 68 is provided with the first annular groove 69, and the outer wall of the piston 4 is provided with the second annular groove 49. The body 52 is accommodated in the first annular groove 69 and the second annular groove 49, and the inner wall of the body 52 abuts against the outer wall of the piston 4 and the second inner wall 61 of the first annular groove 69. The second boss 53 is fixedly connected with the bottom of the cylinder body 6 by a screw. The second accommodating cavity 48 is formed in the piston 4, and the connecting rod 82 is accommodated in the second accommodating cavity 48, and the outer wall of the connecting rod 82 abuts against the inner wall of the second accommodating cavity 48.

[0034] The sealing device comprises at least two groups of sealing assemblies, including the first sealing assembly 1 and the second sealing assembly 2. The first sealing assembly 1 is arranged between the piston 4 and the cylinder body 6, is fixedly sleeved on the piston 4 and abuts against the cylinder body 6, and forms the first radial seal between the piston 4 and the cylinder body 6. The second sealing assembly 2 is arranged between the compression ring 5 and the piston 4, is fixedly embedded in the compression ring 5 and abuts against the piston 4, and forms the second radial seal between the compression ring 5 and the piston 4. The at least two groups of sealing assemblies further comprise the third sealing assembly 3, which is arranged between the compression ring 5 and the cylinder body 6, is fixedly sleeved on the compression ring 5 and abuts against the cylinder body 6, and forms the third radial seal between the compression ring 5 and the cylinder body 6.

[0035] Specifically, the first sealing assembly 1 is in interference fit with the piston 4 and the cylinder body 6, and the interference amount is 0.1-0.6 mm. The second sealing assembly 2 is in interference fit with the compression ring 5 and the piston 4, and the interference amount is 0.1-0.4 mm. The third sealing assembly 3 is in interference fit with the compression ring 5 and the cylinder body 6, and the interference amount is 0.1-0.3 mm. Each sealing assembly is composed of a plurality of sealing elements.

[0036] As Figures 3 to 4As shown, the first sealing assembly 1 comprises a first main sealing member 10, which is a Stoff seal ring. A first groove 90 is formed on the outer wall of the piston 4, and the first main sealing member 10 is accommodated in the first groove 90 and abuts against the inner wall of the first groove 90 and the inner wall of the cylinder body 6, for sealing high-pressure hydraulic oil. Specifically, the outer wall of the piston 4 comprises a first outer portion 40 and a second outer portion 41. The first groove 90 is located at the lower end of the first outer portion 40 and close to the oil cavity 800. The first main sealing member 10 is in interference fit with the inner wall of the first groove 90 with an interference amount of 0.6 mm. The first main sealing member 10 is in interference fit with the first inner wall 60 of the cylinder body 6 with an interference amount of 0.6 mm. The first main sealing member 10 is in interference fit with the first inner wall 60 of the cylinder body 6 with an interference amount of 0.6 mm. By arranging the first main sealing member 10 on the first outer portion 40 of the piston 4 and connecting it with the cylinder body 6, the hydraulic rivet gun can withstand high pressure when dealing with the impact of high-pressure oil, and the pressure bearing level is improved from 25 MPa to 40 MPa, which plays a main sealing role and improves the sealing effect. Moreover, the first main sealing member 10 is close to the oil cavity 800, which can quickly prevent the impact of hydraulic oil on the piston 4 and the cylinder body 6 during the rivet operation, so that the sealing is more timely and effective.

[0037] The first sealing assembly 1 further comprises a first auxiliary sealing member 11, which is a YX type sealing ring. A second groove 91 is formed on the outer wall of the piston 4, and the first auxiliary sealing member 11 is accommodated in the second groove 91 and abuts against the inner wall of the second groove 91 and the inner wall of the cylinder body 6, for sealing low-pressure hydraulic oil. Specifically, the second groove 91 is located above the first groove 90. The first auxiliary sealing member 11 is in interference fit with the inner wall of the second groove 91 with an interference amount of 0.3 mm. The first auxiliary sealing member 11 is in interference fit with the first inner wall 60 of the cylinder body 6 with an interference amount of 0.3 mm. By arranging the first auxiliary sealing member 11 on the first outer portion 40 of the piston 4 and connecting it with the cylinder body 6, the hydraulic rivet gun can achieve good sealing effect when dealing with low pressure.

[0038] The first sealing assembly 1 further comprises a third sealing member 12. A third groove 92 is formed on the outer wall of the piston 4, and the third sealing member 12 is accommodated in the third groove 92 and abuts against the inner wall of the third groove 92 and the inner wall of the cylinder body 6, for sealing gas. Specifically, the third groove 92 is located above the second groove 91. The third sealing member 12 is an O-ring. The third sealing member 12 is in interference fit with the third groove 92 with an interference amount of 0.1 mm. The third sealing member 12 is in interference fit with the first inner wall 60 of the cylinder body 6 with an interference amount of 0.1 mm. By arranging the third sealing member 12 on the first outer portion 40 of the piston 4 and connecting it with the cylinder body 6, the hydraulic oil can be effectively sealed while the gas can also be effectively sealed, and dustproof can be achieved.

[0039] The first sealing assembly 1 is a plurality of sealing elements sleeved on the first outer portion 40 of the piston 4, and the sealing elements are distributed at a certain distance from each other, so that the gap between the piston 4 and the cylinder body 6 can be effectively sealed layer by layer, thereby prolonging the service life of each sealing element, reducing the replacement frequency of the sealing element, and improving the sealing performance, stability and durability of the sealing device.

[0040] As shown in Figures 3 to 4 The second sealing assembly 2 comprises a second primary sealing element 20, which is a Stoff seal ring. The inner side of the pressing ring 5 is provided with a fourth groove 93, and the second primary sealing element 20 is accommodated in the fourth groove 93 and abuts against the inner wall of the fourth groove 93 and the inner wall of the connecting rod 82, and is used for sealing high-pressure hydraulic oil. Specifically, the fourth groove 93 is located at the upper end of the inner wall of the body 52 and is close to the oil cavity 800. The second primary sealing element 20 is in interference fit with the inner wall of the fourth groove 93, and the interference amount is 0.4 mm. The second primary sealing element 20 is in interference fit with the second outer portion 41 of the piston 4, and the interference amount is 0.4 mm. By arranging the second primary sealing element 20 on the inner side of the pressing ring 5 and connecting it with the piston 4, the hydraulic rivet gun can resist high pressure when it is impacted by high-pressure oil, and the pressure bearing level is increased from 25 MPa to 40 MPa, and it plays a main sealing role and improves the sealing effect. Moreover, the position of the second primary sealing element 20 is close to the oil cavity 800, so that the impact of hydraulic oil on the pressing ring 5 and the piston 4 can be quickly prevented during riveting, and the sealing is more timely and effective.

[0041] The second sealing assembly 2 further comprises a second secondary sealing element 21, which is a YX type sealing ring. The inner side of the pressing ring 5 is further provided with a fifth groove 94, and the second secondary sealing element 21 is accommodated in the fifth groove 94 and abuts against the inner wall of the fifth groove 94 and the inner wall of the connecting rod 82, and is used for sealing high-pressure hydraulic oil. Specifically, the fifth groove 94 is located below the fourth groove 93, and the second sealing assembly 2 is in interference fit with the piston 4, and the interference amount is 0.1-0.4 mm. The second secondary sealing element 21 is in interference fit with the second outer portion 41 of the piston 4, and the interference amount is 0.1 mm. By arranging the second secondary sealing element 21 on the inner side of the pressing ring 5 and connecting it with the piston 4, good sealing effect can be achieved when low pressure is encountered.

[0042] By embedding a plurality of sealing elements on the inner side of the pressing ring 5 and distributing the sealing elements at a certain distance from each other, the gap between the pressing ring 5 and the piston 4 can be effectively sealed layer by layer, thereby prolonging the service life of each sealing element, reducing the replacement frequency of the sealing element, and improving the sealing performance, stability and durability of the sealing device.

[0043] As shown in Figures 3 to 4As shown, the third sealing assembly 3 comprises a first static seal 30 and a second static seal 31, the outer side of the pressure ring 5 is provided with a sixth groove 95 and a seventh groove 96, the first static seal 30 is accommodated in the sixth groove 95 and abuts against the inner wall of the sixth groove 95 and the inner wall of the cylinder body 6 at the same time, and the second static seal 31 is accommodated in the seventh groove 96 and abuts against the inner wall of the seventh groove 96 and the inner wall of the cylinder body 6 at the same time. Specifically, the sixth groove 95 is located at the upper end of the outer wall of the body 52 and close to the oil cavity 800. The first static seal 30 is in interference fit with the inner wall of the sixth groove 95 with an interference of 0.3mm; the first static seal 30 is in interference fit with the second inner wall 61 of the cylinder body 6 with an interference of 0.3mm; the position of the first static seal 30 is close to the top end of the pressure ring 5, and the first static seal 30 can quickly prevent the impact of hydraulic oil on the pressure ring 5 and the cylinder body 6 during the pull riveting, and the sealing is more timely and effective. The seventh groove 96 is located below the sixth groove 95. The second static seal 31 is in interference fit with the seventh groove 96 with an interference of 0.1mm; the second static seal 31 is in interference fit with the second inner wall 61 of the cylinder body 6 with an interference of 0.1mm. Among them, the first static seal 30 and the second static seal 31 are O-rings. There is no relative movement between the pressure ring 5 and the cylinder body 6, by setting the first static seal 30 and the second static seal 31, the static sealing effect of the pressure ring 5 and the cylinder body 6 on the hydraulic oil is improved, and the structure is simple and easy to replace.

[0044] By setting multiple sealing elements, the gap between the piston and the cylinder body, the gap between the piston and the pressure ring, and the gap between the pressure ring and the cylinder body are effectively sealed layer by layer, the service life of each sealing element is prolonged, the replacement frequency of the sealing element is reduced, and the sealing performance, stability and durability of the entire sealing device are improved.

[0045] Further referring to Figure 3 and Figure 4 , the first guiding element 70 is further arranged between the piston 4 and the cylinder body 6, and the second guiding element 71 is further arranged between the piston 4 and the pressure ring 5, and the first guiding element 70 and the second guiding element 71 are both guiding belts. Specifically, the eighth groove 97 is further provided on the first outer portion 40 of the piston 4, the first guiding element 70 is accommodated in the eighth groove 97 and abuts against the inner wall of the eighth groove 97, and at the same time, the first guiding element 70 and the first inner wall 60 of the cylinder body 6 form a gap fit. The inner side of the pressure ring 5 is further provided with a ninth groove 98, the second guiding element 71 is accommodated in the ninth groove 98 and abuts against the inner wall of the ninth groove 98, and at the same time, the second guiding element 71 and the second outer portion 41 of the piston 4 form a gap fit. By arranging the first guiding element 70 between the piston 4 and the cylinder body 6, the friction between the piston 4 and the cylinder body 6 can be effectively reduced, and the service life is prolonged. By arranging the second guiding element 71 between the piston 4 and the pressure ring 5, the friction between the piston 4 and the pressure ring 5 can be effectively reduced, and the service life is prolonged.

[0046] A dustproof element 72 is further arranged between the piston 4 and the compression ring 5, and the dustproof element 72 is a dustproof ring. The dustproof element 72 is embedded in the compression ring 5. The inner side of the compression ring 5 is provided with a tenth groove 99, the dustproof element 72 is accommodated in the tenth groove 99, and is matched with the second outer portion 41 of the piston 4. By arranging the dustproof element 72 between the compression ring 5 and the piston 4, dust can be effectively prevented from entering the cylinder body 6 to damage the sealing element.

[0047] In addition, in order to ensure that the connecting rod does not swing during high-speed rotation during pull riveting, the hydraulic pull riveting gun further comprises a stabilizing device. Figure 5 and 6 As shown in the figures, the stabilizing device comprises at least two bearings, and the at least two bearings are arranged between the piston 4 and the connecting rod 82, and are fixedly installed at both ends of the piston 4 and fixedly support the connecting rod 82.

[0048] The at least two bearings comprise a first bearing 84, which is a plane bearing and is accommodated in the upper end of the piston 4. The inner wall of the piston 4 is provided with a first bearing groove 43, the first bearing 84 is accommodated in the first bearing groove 43, and a first inner ring 840 of the first bearing 84 fixedly supports the connecting rod 82, for providing tension to the connecting rod 82. Specifically, a first outer ring 841 of the first bearing 84 abuts against the side wall of the first bearing groove 43, and the first inner ring 840 abuts against a first outer wall 820 of the connecting rod 82. By arranging the first bearing 84 between the piston 4 and the connecting rod 82, tension can be provided to the connecting rod 82, so that the connecting rod 82 can rotate normally while damping.

[0049] The at least two bearings comprise a second bearing 85, which is a deep groove ball bearing and is accommodated in the upper end of the piston 4. The inner wall of the piston 4 is provided with a second bearing groove 44, the second bearing 85 is accommodated in the second bearing groove 44, and a second inner ring 850 of the second bearing 85 fixedly supports the connecting rod 82, for keeping the connecting rod 82 stable so that it does not swing. The first bearing groove 43 is in communication with the second bearing groove 44, and the first bearing 84 abuts against the second bearing 85. Specifically, the first bearing groove 43 is located above the second bearing groove 44 and is in communication with the second bearing groove 44. A second outer ring 851 of the second bearing 85 abuts against the side wall of the second bearing groove 44, and the second inner ring 850 of the second bearing 85 abuts against the first outer wall 820 of the connecting rod 82. The top of the second bearing 85 (not shown in the figure) abuts against the bottom of the first bearing 84. By arranging the second bearing 85 between the piston 4 and the connecting rod 82, it can be ensured that the connecting rod 82 does not swing, and high-speed rotation is smoother.

[0050] The at least two bearings include a third bearing 86 which is an angular contact ball bearing and is accommodated in the lower end of the piston 4. The inner wall of the piston 4 is provided with a third bearing groove 45, and the lower end of the connecting rod 82 is provided with a third ring groove 826, the third bearing 86 is accommodated in the third bearing groove 45 and the third ring groove 826 at the same time, and the third inner ring 860 of the third bearing 86 fixedly supports the connecting rod 82, for maintaining the tension of the connecting rod 82. The first groove surface 450 of the third bearing groove 45 is flush with the second end surface 823 of the third ring groove 826, and the third bearing 86 abuts against the first groove surface 450 and the second end surface 823 at the same time. Specifically, the third outer ring 861 of the third bearing 86 abuts against the inner wall of the third bearing groove 45 and the second outer wall 821 of the third ring groove 826 at the same time. The upper end surface of the third bearing 86 abuts against the first groove surface 450 and the second end surface 823 at the same time. By arranging the third bearing 86 between the piston 4 and the connecting rod 82, the phenomenon of swinging of the connecting rod 82 can be avoided, and the tension of the connecting rod 82 can be maintained.

[0051] The connecting rod 82 is provided with a first boss 825 at one end, and a spacer ring 87 is arranged between the first boss 825 and the first bearing 84, the spacer ring being sleeved on the connecting rod 82 and abutting against the first boss 825 at one end and abutting against the first bearing 84 at the other end. Specifically, the upper end of the connecting rod 82 is provided with the first boss 825, and the lower end of the spacer ring 87 is provided with a fourth boss 870. The fourth boss 870 abuts against the first inner ring 840 and the top of the first bearing 84 at the same time, and the upper end surface of the spacer ring 87 abuts against the first end surface 822 of the first boss 825. By using the spacer ring 87, the distance between the first bearing 84 and the connecting rod 82 is compensated, so that the relative movement between the piston 4 and the connecting rod 82 is more stable, and the sealing property is also improved, preventing oil leakage.

[0052] The stabilizing device further comprises a limiting piece 88 and a locking piece 89, the limiting piece 88 is fixedly connected with the locking piece 89, and the limiting piece 88 and the locking piece 89 are both sleeved on the connecting rod 82. Specifically, the limiting piece 88 and the locking piece 89 are both provided with internal threads, and the second outer wall 821 of the connecting rod 82 is provided with external threads, the limiting piece 88 is fixedly connected with the connecting rod 82 through threads and abuts against the third bottom 862 of the third bearing 86. The locking piece 89 is fixedly connected with the connecting rod 82 through threads, and the locking piece 89 is fixedly connected with the limiting piece 88 through a screw. The limiting piece 88 can limit the position of the third bearing 86, so that the third bearing 86 can work normally.

[0053] The hydraulic rivet gun also has a buffer device. Figures 7 to 9As shown, the buffer device comprises a pull rivet screw 83 and an elastic member 833, one end of the elastic member 833 is connected with the connecting rod 82, the other end is connected with the pull rivet screw 83, the driver 81 drives the connecting rod 82 to rotate, thereby driving the elastic member 833 to rotate, and the elastic member 833 drives the pull rivet screw 83 to slide up and down. By arranging the elastic member 833 between the connecting rod 82 and the pull rivet screw 83, the high-speed rotation of the driver 81 driving the connecting rod 82 is buffered, thereby achieving deceleration, ensuring the quality of the pull rivet, and by arranging the elastic member 833 instead of the speed reducer, the structure is simple, and the weight of the hydraulic pull rivet gun is reduced.

[0054] Wherein, the third boss 837 is arranged on one end of the connecting rod 82 close to the buffer device, one end of the elastic member 833 is clamped with the third boss 837, and the other end is fixedly connected with the upper end surface of the pull rivet screw 83. Wherein, the connecting rod 82 is fixedly connected with a bolt 846 at the bottom, the third boss 837 is installed on the bolt 846, and the upper end of the elastic member 833 is clamped between the third boss 837 and the lower end surface of the connecting rod 82. The buffer device further comprises a connecting sleeve 830, the elastic member 833 is accommodated in the connecting sleeve 830, one end of the connecting sleeve 830 is rotatably sleeved on the connecting rod 82, the other end is slidably sleeved on the pull rivet screw 83, and the third boss 837 is accommodated in the connecting sleeve 830. Specifically, the connecting sleeve 830 is internally through and forms a third accommodating cavity 839, and the elastic member 833 is accommodated in the third accommodating cavity 839. The third boss 837 is long strip-shaped, and the two ends thereof are provided with arc surfaces 845, and the arc surfaces 845 abut against the inner wall of the connecting sleeve 830.

[0055] The buffer device further comprises a pin rod 831, the pull rivet screw 83 is provided with a first through hole 834, the connecting sleeve 830 is provided with a pair of waist-shaped through holes 835 symmetrical along the axis of the pull rivet screw 83, and the pin rod 831 is accommodated in the first through hole 834 and the two ends thereof are accommodated in the pair of waist-shaped through holes 835 respectively. The pin rod 831 is in clearance fit with the pull rivet screw 83. When the elastic member 833 drives the pull rivet screw 83 to slide up and down in the connecting sleeve 830, the pin rod 831 can slide in the waist-shaped through hole 835 under the drive of the pull rivet screw 83, and the sliding distance of the pull rivet screw 83 in the connecting sleeve 830 is equal to the sliding distance of the pin rod 831 in the waist-shaped through hole 835. When the pull rivet screw 83 is retracted, the pin rod 831 and the pull rivet screw 83 can move simultaneously under the action of the elastic member 833, which buffers the rapid movement of the driver 81 and the connecting rod 82, so that the pull rivet screw 83 retracts more smoothly. At the same time, when the pull rivet gun rotates, there is a downward pressure on the rivet, by inserting the pin rod 831 into the pull rivet screw 83, and the two ends of the pin rod 831 are accommodated in the waist-shaped through hole 835 of the connecting sleeve 830, the pin rod 831 abuts against the waist-shaped through hole 835, which ensures the downward pressure of the pull rivet screw 83.

[0056] The buffer device further comprises a clamping spring 832 sleeved on the connecting sleeve 830 and connected with the pin rod 831, wherein arc-shaped grooves 836 are formed at two ends of the pin rod 831 respectively, and the clamping spring 832 is detachably clamped in the arc-shaped grooves 836. The clamping spring 832 is made of spring steel and is provided with a gap 838 for disassembly. When any one end of the pin rod 831 is located in the gap 838, the clamping spring 832 can be detached from the pin rod 831. By arranging the clamping spring 832, the pin rod 831 can be prevented from being thrown out of the pull rivet screw rod 83 when the pull rivet screw rod 83 rotates, so that the pull rivet operation can be smoothly performed.

[0057] In operation, the driver 81 rotates at high speed to drive the connecting rod 82 to rotate, so that the pull rivet screw rod 83 rotates to enter a rivet (not shown in the figure), then the hydraulic oil is pressurized by a pressure booster (not shown in the figure) and rapidly injected into the hydraulic oil pipe 80, so that the piston 4 moves axially, and the piston 4 drives the connecting rod 82 and the pull rivet screw rod 83 to move axially, thereby completing the pull rivet process.

[0058] The first main sealing element 10 arranged on the first outer part 40 of the piston 4 and connected with the cylinder body 6 and the second main sealing element 20 arranged on the inner side of the compression ring 5 and connected with the piston 4 can resist high pressure when facing the impact of high-pressure oil, the pressure bearing level is improved from 25MPa to 40MPa, and the main sealing effect is good. The first auxiliary sealing element 11 arranged on the first outer part 40 of the piston 4 and connected with the cylinder body 6 and the second auxiliary sealing element 21 arranged on the inner side of the compression ring 5 and connected with the piston 4 can achieve good sealing effect when facing low pressure. The third sealing element 12 arranged on the first outer part 40 of the piston 4 and connected with the cylinder body 6 can simultaneously seal the hydraulic oil and the gas, and can also play a dustproof role. The first static sealing element 30 and the second static sealing element 31 arranged on the compression ring 5 and abutting against the cylinder body 6 improve the performance of the static sealing element of the compression ring 5 and the cylinder body 6, and the structure is simple and easy to replace. The first main sealing element 10, the second main sealing element 20 and the first static sealing element 30 are arranged close to the oil cavity 800, so that the sealing is more timely and effective. The multiple sealing elements effectively seal the gap between the piston and the cylinder body, the gap between the piston and the compression ring and the gap between the compression ring and the cylinder body, prolong the service life of each sealing element, reduce the replacement frequency of the sealing element, and improve the sealing performance, stability and durability of the entire sealing device. The first guide element 70 arranged between the piston 4 and the cylinder body 6 and the second guide element 71 arranged between the piston 4 and the compression ring 5 prevent the friction between the piston 4 and the cylinder body 6 and between the piston 4 and the compression ring 5, and protect the cylinder body 6, the piston 4 and the compression ring 5 from being damaged. The dustproof element 72 can prevent dust from entering the cylinder body, damaging the sealing element and prolonging the service life of the sealing element.

[0059] The utility model discloses still set up the second bearing 85 between piston 4 and connecting rod 82, can guarantee that connecting rod 82 does not appear the phenomenon of swing, high -speed rotation is more smooth. Set up the first bearing 84 between piston 4 and connecting rod 82, can provide the tension to connecting rod 82, make connecting rod 82 keep normal rotation, and can play the function of shock attenuation. Set up the third bearing 86 between piston 4 and connecting rod 82, can guarantee that connecting rod 82 does not appear the phenomenon of swing, guarantee the tension of connecting rod 82 simultaneously.

[0060] The utility model discloses a connecting rod 82 and pull rivet screw rod 83 between setting elastic part 833, the high -speed rotation of drive 81 drive connecting rod 82 is buffered to realize deceleration, guarantee the quality of pull rivet, and through setting elastic part 833 instead of decelerator structure is simple, and make the hydraulic pull riveter self -weight lightening. Through the pin rod 831 is inserted in pull rivet screw rod 83, and the both ends of pin rod 831 are accommodated in the waist -shaped through -hole 835 of connecting sleeve 830, and when pull rivet screw rod 83 unthreads, pin rod 831 and pull rivet screw rod 83 can move under the action of elastic part 833 simultaneously, buffer drive 81 and the fast motion of connecting rod 82, make pull rivet screw rod 83 unthread more smoothly. When the rivet of pull riveter rotates, there will be a downward pressure to rivet, through the pin rod 831 is inserted in pull rivet screw rod 83, and the both ends of pin rod 831 are accommodated in the waist -shaped through -hole 835 of connecting sleeve 830, and pin rod 831 is against the waist -shaped through -hole 835, guarantees the downward pressure of pull rivet screw rod 83. Through setting snap spring 832, can prevent pin rod 831 from being thrown out from pull rivet screw rod 83 when pull rivet screw rod 83 rotates, guarantee the smooth operation of pull rivet work.

[0061] The above embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but can not be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled person in the art, on the premise of not departing from the utility model concept, can make several deformation and improvement, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be the attached right claim.

Claims

1. A cushioning device for a hydraulic torque controlled nut runner, wherein, The hydraulic rivet gun comprises a driver (81) and a connecting rod (82), characterized in that the buffer device comprises a rivet screw (83) and an elastic member (833), one end of the elastic member (833) is connected with the connecting rod (82), the other end of the elastic member (833) is connected with the rivet screw (83), the driver (81) drives the connecting rod (82) to rotate, thereby driving the elastic member (833) to rotate, and the elastic member (833) drives the rivet screw (83) to slide up and down. The buffer device further comprises a connecting sleeve (830), the elastic member (833) is accommodated in the connecting sleeve (830), one end of the connecting sleeve (830) is rotatably sleeved on the connecting rod (82), and the other end of the connecting sleeve (830) is slidably sleeved on the rivet screw (83). The buffer device further comprises a pin rod (831), the rivet screw (83) is provided with a first through hole (834), the connecting sleeve (830) is provided with a pair of waist-shaped through holes (835) which are symmetrical along the axis of the rivet screw (83), and the pin rod (831) is accommodated in the first through hole (834) and has two ends respectively accommodated in the pair of waist-shaped through holes (835). The buffer device further comprises a clamping spring (832), the clamping spring (832) is sleeved on the connecting sleeve (830) and is clamped with the pin rod (831).

2. The cushioning device of a hydraulic pull rivet gun according to claim 1, characterized in that, One end of the connecting rod (82) close to the buffer device is provided with a third boss (837), one end of the elastic member (833) is clamped with the third boss (837), and the other end of the elastic member (833) is clamped with the upper end surface of the rivet screw (83).

3. The cushioning device of a hydraulic pull rivet gun according to claim 2, characterized in that, The bottom of the connecting rod (82) is fixedly connected with a bolt (345), the third boss (837) is installed on the bolt (345), and the upper end of the elastic member (833) is clamped between the third boss (837) and the lower end surface of the connecting rod (82).

4. The cushioning device of a hydraulic pull rivet gun according to claim 3, characterized in that, The third boss (837) is accommodated in the connecting sleeve (830).

5. The cushioning device of a hydraulic pull rivet gun according to claim 3, wherein The third boss (837) is in a strip shape, and the two ends of the third boss (837) are provided with arc-shaped surfaces (845), and the arc-shaped surfaces (845) abut against the inner wall of the connecting sleeve (830).

6. The cushioning device of a hydraulic pull rivet gun according to claim 1, wherein The pin rod (831) is in clearance fit with the rivet screw (83).

7. The cushioning device of a hydraulic pull rivet gun according to claim 1, wherein The two ends of the pin rod (831) are respectively provided with arc-shaped grooves (836), and the clamping spring (832) is detachably clamped in the arc-shaped grooves (836).

8. The cushioning device of a hydraulic pull rivet gun according to claim 7, characterized in that, The material of the clamping spring (832) is spring steel, and the clamping spring (832) is provided with a notch (838) for disassembly.

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