Sealing device of hydraulic hand riveter

Abstract

The invention discloses a sealing device of a hydraulic hand riveter. The hydraulic hand riveter comprises a piston, a pressing ring and a cylinder body. The piston is contained in the cylinder body in a sliding mode, the pressing ring is contained at one end of the cylinder body and arranged on the piston in a sleeving mode, and an oil cavity capable of containing hydraulic oil is formed between the piston and the pressing ring. The sealing device comprises at least two sealing assemblies. The at least two sets of sealing assemblies comprise the first sealing assembly and the second sealing assembly. The first sealing assembly is arranged between the piston and the cylinder body, the piston is fixedly sleeved with the first sealing assembly, the first sealing assembly abuts against the cylinder body, and first radial sealing between the piston and the cylinder body is formed. The second sealing assembly is arranged between the pressing ring and the piston, and the second sealing assembly is fixedly embedded in the pressing ring and abuts against the piston to form second radial sealing between the pressing ring and the piston. Radial sealing between the piston and the cylinder body and between the piston and the pressing ring can be formed, so that the sealing performance of the hydraulic cylinder body is guaranteed, hydraulic oil leakage is prevented, and waste of the hydraulic oil is reduced.

Description

Technical Field

[0001] The invention relates to the field of rivet guns, and in particular to a sealing device of a hydraulic rivet gun. Background Art

[0002] Rivet guns are used for fastening and riveting of various metal plates, pipes and other manufacturing industries. They are widely used in the riveting of electromechanical and light industrial products such as elevators, switches, instruments, furniture, and decorations. They can rivet products that do not require tapping of internal threads or welding of nuts.

[0003] According to the power source, rivet guns are divided into manual rivet guns, pneumatic hydraulic rivet guns, hydraulic rivet guns, electric rivet guns, etc. Among them, hydraulic rivet guns use hydraulic oil to flow inside the rivet gun to make the piston and the cylinder body move relative to each other. In order to ensure that the hydraulic oil does not leak in the gun body, a sealing assembly consisting of an O-ring is usually set between the piston and the cylinder body. However, due to the high-speed reciprocating motion between the piston and the cylinder body, the sealing assembly causes certain friction and wear. After wear, the gap between the sealing assembly and the piston and the cylinder body becomes larger, and the sealing performance is also reduced, which leads to leakage of hydraulic oil. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a sealing device for a hydraulic rivet gun, which can ensure the sealing performance between the piston and the cylinder body and between the piston and the pressure ring, thereby preventing hydraulic oil leakage and reducing the waste of hydraulic oil.

[0005] The present invention is achieved through the following technical solutions:

[0006] A sealing device for a hydraulic rivet gun, the hydraulic rivet gun comprises a piston, a pressure ring, and a cylinder body, the piston is slidably accommodated in the cylinder body, the pressure ring is accommodated at one end of the cylinder body and is sleeved on the piston, an oil chamber for accommodating hydraulic oil is formed between the piston and the pressure ring, the sealing device comprises at least two groups of sealing components, the at least two groups of sealing components comprise a first sealing component and a second sealing component, the first sealing component is arranged between the piston and the cylinder body, the first sealing component is fixedly sleeved on the piston and abuts against the cylinder body, forming a first radial seal between the piston and the cylinder body; the second sealing component is arranged between the pressure ring and the piston, the second sealing component is fixedly embedded in the pressure ring and abuts against the piston, forming a second radial seal between the pressure ring and the piston.

[0007] Furthermore, the first sealing assembly includes a first main seal, which is a step seal ring. A first groove is opened on the outer wall of the piston. The first main seal is accommodated in the first groove and simultaneously abuts against the inner wall of the first groove and the inner wall of the cylinder body to seal the high-pressure hydraulic oil.

[0008] Furthermore, the first sealing assembly also includes a first secondary seal, which is a YX-type sealing ring. A second groove is also provided on the outer wall of the piston. The first secondary seal is accommodated in the second groove and simultaneously abuts against the inner wall of the second groove and the inner wall of the cylinder body to seal the low-pressure hydraulic oil.

[0009] Furthermore, the first sealing assembly also includes a third sealing member. A third groove is also provided on the outer wall of the piston. The third sealing member is accommodated in the third groove and simultaneously abuts against the inner wall of the third groove and the inner wall of the cylinder body to seal the gas.

[0010] Furthermore, the second sealing assembly includes a second main seal, which is a step seal ring. A fourth groove is opened on the inner side of the pressure ring. The second main seal is accommodated in the fourth groove and simultaneously abuts against the inner wall of the fourth groove and the inner wall of the connecting rod to seal the high-pressure hydraulic oil.

[0011] Furthermore, the second sealing assembly also includes a second auxiliary seal, which is a YX-type sealing ring. A fifth groove is also provided on the inner side of the pressure ring. The second auxiliary seal is accommodated in the fifth groove and simultaneously abuts against the inner wall of the fifth groove and the inner wall of the connecting rod to seal the high-pressure hydraulic oil.

[0012] Furthermore, at least two sets of sealing assemblies also include a third sealing assembly, which is arranged between the pressure ring and the cylinder body. The third sealing assembly is fixedly sleeved on the pressure ring and abuts against the cylinder body to form a third radial seal between the pressure ring and the cylinder body.

[0013] Furthermore, the third sealing assembly includes a first static seal and a second static seal, and a sixth groove and a seventh groove are opened on the outer side of the pressure ring. The first static seal is accommodated in the sixth groove and abuts against the inner wall of the sixth groove and the inner wall of the cylinder body at the same time, and the second static seal is accommodated in the seventh groove and abuts against the inner wall of the seventh groove and the inner wall of the cylinder body at the same time.

[0014] Furthermore, the pressure ring comprises a body, an outer wall of the body abuts against an inner wall of the cylinder body, and an inner wall of the body abuts against an outer wall of the piston.

[0015] Furthermore, the pressure ring also includes a second boss protruding outward relative to the body, and the second boss is fixedly connected to the bottom of the cylinder body.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. By setting the first main seal on the first outside of the piston and connected to the cylinder body and the second main seal on the inner side of the pressure ring and connected to the piston, it can withstand high pressure when dealing with the impact of high-pressure oil, and the pressure resistance level is increased from 25MPa to 40MPa, and plays a major sealing role with good sealing effect.

[0018] 2. A first secondary seal disposed on the first outer portion of the piston and connected to the cylinder body and a second secondary seal disposed on the inner side of the pressure ring and connected to the piston can provide a good sealing effect when dealing with low pressure.

[0019] 3. By providing a third seal on the first outer portion of the piston and connected to the cylinder body, gas sealing can be performed and dust prevention can be achieved.

[0020] 4. Each sealing assembly includes multiple sealing elements, which effectively seal 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 layer by layer, thereby extending the life of each sealing element, reducing the replacement frequency of the sealing element, and improving the sealing, stability and durability of the entire sealing device.

[0021] 5. By arranging the first main seal at the end surface close to the piston, and arranging the second main seal and the first static seal at the top end close to the pressure ring, the sealing is more timely and effective.

[0022] 6. By arranging guide elements between the piston and the cylinder body and between the piston and the pressure ring, friction between the piston and the cylinder body and between the piston and the pressure ring is prevented, and the cylinder body, the piston and the pressure ring are protected from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a left side view of a hydraulic rivet gun of the present invention;

[0024] Figure 2 for Figure 1 Sectional view along AA;

[0025] Figure 3 for Figure 2 Enlarged view of middle B;

[0026] Figure 4 An exploded view of the sealing device;

[0027] Figure 5 for Figure 2 Another enlarged view of middle B;

[0028] Figure 6 An exploded view of the stabilization device;

[0029] Figure 7 The assembly drawing of the buffer device;

[0030] Figure 8 for Figure 2 Enlarged view of middle C;

[0031] Fig. 9 This is an exploded view of the buffer device.

[0032] In the figure: 1, first sealing assembly; 10, first main sealing member; 11, first secondary sealing member; 12, third sealing member; 2, second sealing assembly; 20, second main sealing member; 21, second secondary sealing member; 3, third sealing assembly; 30, first static sealing member; 31, second static sealing member; 4, piston; 40, first outer portion; 41, second outer portion; 43, first bearing groove; 44, second bearing groove; 45, third bearing groove; 450, first groove surface; 46 8, second accommodating chamber; 49, second annular groove; 5, pressure ring; 52, body; 53, second boss; 6, cylinder body; 60, first inner wall; 61, second inner wall; 68, first accommodating chamber; 69, first annular groove; 70, first guide element; 71, second guide element; 72, dustproof element; 80, hydraulic oil pipe; 800, oil chamber; 81, driver; 82, connecting rod; 820, first outer wall; 821, second outer wall; 822, first end face; 8 23, second end face; 825, first boss; 826, third annular groove; 83, rivet screw; 830, connecting sleeve; 831, pin; 832, retaining spring; 833, elastic member; 834, first through hole; 835, waist-shaped through hole; 836, arc groove; 837, third boss; 838, notch; 839, third accommodating cavity; 84, first bearing; 840, first inner ring; 841, first outer ring; 845, arc surface; 85, second bearing; 850, second inner ring; 851, second outer ring; 86, third bearing; 860, third inner ring; 861, third outer ring; 87, gasket; 870, fourth boss; 88, limiter; 89, locking member; G, radial; 90, first groove; 91, second groove; 92, third groove; 93, fourth groove; 94, fifth groove; 95, sixth groove; 96, seventh groove; 97, eighth groove; 98, ninth groove; 99, tenth groove. DETAILED DESCRIPTION

[0033] The following is a further non-restrictive detailed description of the technical solution of the invention in conjunction with the preferred embodiments and the accompanying drawings. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and cannot be understood as limitations on the present invention.

[0034] like Figure 1 and Figure 2 As shown, a hydraulic rivet gun according to an embodiment of the present invention comprises a piston 4, a pressure ring 5, a cylinder body 6, a hydraulic oil pipe 80, a driver 81, a connecting rod 82 and a rivet screw 83. The connecting rod 82 is accommodated in the piston 4, and one end is connected to the driver 81, and the other end is connected to the rivet screw 83. The pressure ring 5 is sleeved on the piston 4 and accommodated in the cylinder body 6 together with the piston 4. An oil circuit (not shown) is provided on the cylinder body 6, and the oil circuit is connected to the gap between the piston 4 and the pressure ring 5, and the hydraulic oil pipe 80 is installed in the oil circuit. The piston 4 can be slidably accommodated in the cylinder body 6, and the pressure ring 5 is accommodated at one end of the cylinder body 6 and sleeved on the piston 4, and an oil chamber 800 that can accommodate hydraulic oil is formed between the piston 4 and the pressure ring 5. The piston 4 is slidably sleeved on the connecting rod 82, and the connecting rod 82 is fixedly connected to the rivet screw 83. The driver 81 drives the connecting rod 82 to rotate in the piston 4, thereby driving the rivet screw 83 to rotate, and completing the rivet.

[0035] The pressure ring 5 includes a body 52, the outer wall of the body 52 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 protruding outward relative to the body 52, and the second boss 53 is fixedly connected to the bottom of the cylinder 6.

[0036] Specifically, the cylinder body 6 is penetrated and formed with a first accommodating chamber 68, and the piston 4 is accommodated in the first accommodating chamber 68 and abuts against the first inner wall 60 of the first accommodating chamber 68. The first inner wall 60 of the first accommodating chamber 68 is provided with a first annular groove 69, and the outer wall of the piston 4 is provided with a second annular groove 49. The body 52 is accommodated in both 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 inner wall of the body 52 abuts against the second inner wall 61 of the first annular groove 69. The second boss 52 is fixedly connected to the bottom of the cylinder body 6 by screws. The piston 4 is penetrated and formed with a second accommodating chamber 48, and the connecting rod 82 is accommodated in the second accommodating chamber 48, and the outer wall of the connecting rod 82 abuts against the inner wall of the second accommodating chamber 48.

[0037] The sealing device includes at least two sets of sealing components, and the at least two sets of sealing components include a first sealing component 1 and a second sealing component 2. The first sealing component 1 is arranged between the piston 4 and the cylinder body 6, and the first sealing component 1 is fixedly sleeved on the piston 4 and abuts against the cylinder body 6 to form a first radial seal between the piston 4 and the cylinder body 6; the second sealing component 2 is arranged between the pressure ring 5 and the piston 4, and the second sealing component 2 is fixedly embedded in the pressure ring 5 and abuts against the piston 4 to form a second radial seal between the pressure ring 5 and the piston 4. At least two sets of sealing components also include a third sealing component 3, and the third sealing component 3 is arranged between the pressure ring 5 and the cylinder body 6, and the third sealing component 3 is fixedly sleeved on the pressure ring 5 and abuts against the cylinder body 6 to form a third radial seal between the pressure ring 5 and the cylinder body 6.

[0038] Specifically, the first sealing component 1 is interference-fitted with the piston 4 and the cylinder body 6 at the same time, and the interference amount is 0.1 to 0.6 mm. The second sealing component 2 is interference-fitted with the pressure ring 5 and the piston 4 at the same time, and the interference amount is 0.1 to 0.4 mm. The third sealing component 3 is interference-fitted with the pressure ring 5 and the cylinder body 6 at the same time, and the interference amount is 0.1 to 0.3 mm. Among them, each sealing component is composed of multiple sealing elements.

[0039] like Figures 3 to 4As shown, the first sealing assembly 1 includes a first main seal 10, which is a step seal ring. A first groove 90 is provided on the outer wall of the piston 4. The first main seal 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 at the same time, so as to seal the high-pressure hydraulic oil. Specifically, the outer wall of the piston 4 includes 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 is close to the oil chamber 800. The first main seal 10 has an interference fit with the inner wall of the first groove 90, and the interference amount is 0.6 mm. The first main seal 10 has an interference fit with the first inner wall 60 of the cylinder body 6, and the interference amount is 0.6 mm. The first main seal 10 has an interference fit with the first inner wall 60 of the cylinder body 6, and the interference amount is 0.6 mm. By arranging the first main seal 10 at the first outer portion 40 of the piston 4 and connecting it to the cylinder 6, the hydraulic riveting gun can withstand high pressure when dealing with the impact of high-pressure oil, and the pressure resistance level is increased from 25MPa to 40MPa, and plays a major sealing role to improve the sealing effect. In addition, the first main seal 10 is located close to the oil chamber 800, which can quickly prevent the hydraulic oil from impacting the piston 4 and the cylinder 6 during the riveting action, making the sealing more timely and effective.

[0040] The first sealing assembly 1 also includes a first secondary seal 11, which is a YX-type sealing ring. A second groove 91 is also provided on the outer wall of the piston 4. The first secondary seal 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 at the same time, so as to seal the low-pressure hydraulic oil. Specifically, the second groove 91 is located above the first groove 90. The first secondary seal 11 has an interference fit with the inner wall of the second groove 91, and the interference amount is 0.3 mm. The first secondary seal 11 has an interference fit with the first inner wall 60 of the cylinder body 6, and the interference amount is 0.3 mm. By arranging the first secondary seal 11 on the first outer part 40 of the piston 4 and connecting it to the cylinder body 6, the hydraulic rivet gun can achieve a good sealing effect when dealing with low pressure.

[0041] The first sealing assembly 1 also includes a third sealing member 12. A third groove 92 is also provided on the outer wall of the piston 4. 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 at the same time, so as to seal the 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 has an interference fit with the third groove 92, and the interference amount is 0.1 mm. The third sealing member 12 has an interference fit with the first inner wall 60 of the cylinder body 6, and the interference amount is 0.1 mm. By arranging the third sealing member 12 on the first outer portion 40 of the piston 4 and connecting it to the cylinder body 6, the gas can be effectively sealed while the hydraulic oil is sealed, and dust prevention can be achieved.

[0042] The first sealing assembly 1 is a plurality of sealing elements which are sleeved on the first outer portion 40 of the piston 4 and are distributed at a certain distance between each other. The gap between the piston 4 and the cylinder body 6 can be effectively sealed layer by layer, thereby extending the life of each sealing element, reducing the frequency of replacing the sealing element, and improving the sealing, stability and durability of the sealing device.

[0043] like Figures 3 to 4 As shown, the second sealing assembly 2 includes a second main seal 20, which is a step seal ring. A fourth groove 93 is provided on the inner side of the pressure ring 5. The second main seal 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 at the same time, so as to seal the 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 chamber 800. The second main seal 20 has an interference fit with the inner wall of the fourth groove 93, and the interference amount is 0.4 mm. The second main seal 20 has an interference fit with the second outer portion 41 of the piston 4, and the interference amount is 0.4 mm. By arranging the second main seal 20 on the inner side of the pressure ring 5 and connecting it to the piston 4, the hydraulic rivet gun can withstand high pressure when dealing with the impact of high-pressure oil, and the pressure bearing level is increased from 25MPa to 40MPa, and plays a major sealing role, thereby improving the sealing effect. Furthermore, the second main seal 20 is located close to the oil chamber 800, which can quickly prevent the hydraulic oil from impacting the pressure ring 5 and the piston 4 during riveting, and the sealing is more timely and effective.

[0044] The second sealing assembly 2 also includes a second secondary seal 21, which is a YX-type sealing ring. A fifth groove 94 is also provided on the inner side of the pressure ring 5. The second secondary seal 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 at the same time, so as to seal the high-pressure hydraulic oil. Specifically, the fifth groove 94 is located below the fourth groove 93, and the second sealing assembly 2 is interference-fitted with the piston 4 with an interference amount of 0.1 to 0.4 mm. The second secondary seal 21 is interference-fitted with the second outer portion 41 of the piston 4 with an interference amount of 0.1 mm. By arranging the second secondary seal 21 on the inner side of the pressure ring 5 and connecting it to the piston 4, a good sealing effect can be achieved when dealing with low pressure.

[0045] By embedding multiple sealing elements inside the pressure ring 5 and distributing the sealing elements at a certain distance between each other, the gap between the pressure ring 5 and the piston 4 can be effectively sealed layer by layer, thereby extending the life of each sealing element, reducing the frequency of replacing the sealing elements, and improving the sealing, stability and durability of the sealing device.

[0046] like Figures 3 to 4As shown, the third sealing assembly 3 includes 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. 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 chamber 800. The first static seal 30 has an interference fit with the inner wall of the sixth groove 95 and the interference amount is 0.3mm; the first static seal 30 has an interference fit with the second inner wall 61 of the cylinder body 6 and the interference amount is 0.3mm; the first static seal 30 is located close to the top of the pressure ring 5, which can quickly prevent the impact of hydraulic oil on the pressure ring 5 and the cylinder body 6 during 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 interference fit with the seventh groove 96 and the interference is 0.1mm; the second static seal 31 is interference fit with the second inner wall 61 of the cylinder body 6 and the interference is 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.

[0047] By arranging 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, thereby extending the life of each sealing element, reducing the replacement frequency of the sealing elements, and improving the sealing, stability and durability of the entire sealing device.

[0048] Further references Figure 3 and Figure 4 , a first guide element 70 is also provided between the piston 4 and the cylinder body 6, and a second guide element 71 is also provided between the piston 4 and the pressure ring 5, and both the first guide element 70 and the second guide element 71 are guide belts. Specifically, an eighth groove 97 is also provided on the first outer portion 40 of the piston 4, and the first guide 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, a clearance fit is formed between the first guide element 70 and the first inner wall 60 of the cylinder body 6. A ninth groove 98 is also provided on the inner side of the pressure ring 5, and the second guide 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, a clearance fit is formed between the second guide element 71 and the second outer portion 41 of the piston 4. By providing the first guide 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 can be extended. By providing the second guide 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 can be extended.

[0049] A dustproof element 72 is also provided between the piston 4 and the pressure ring 5. The dustproof element 72 is a dustproof ring. The dustproof element 72 is embedded in the pressure ring 5. A tenth groove 99 is provided on the inner side of the pressure ring 5. 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 providing the dustproof element 72 between the pressure ring 5 and the piston 4, dust can be effectively prevented from entering the cylinder body 6 and damaging the sealing element.

[0050] In addition, in order to ensure that the connecting rod does not swing when rotating at high speed during riveting, the hydraulic riveting gun of the present invention is also provided with a stabilizing device. Figure 5 and 6 As shown, the stabilizing device includes at least two bearings, and at least two bearings are arranged between the piston 4 and the connecting rod 82 , and at least two bearings are fixedly installed at both ends of the piston 4 and fixedly support the connecting rod 82 .

[0051] At least two bearings include a first bearing 84, which is a plane bearing and is accommodated at the upper end of the piston 4. The inner wall of the piston 4 is provided with a first bearing groove 43, and the first bearing 84 is accommodated in the first bearing groove 43, and the first inner ring 840 of the first bearing 84 fixedly supports the connecting rod 82, and is used to provide a pulling force for the connecting rod 82. Specifically, the 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 the first outer wall 820 of the connecting rod 82. By arranging the first bearing 84 between the piston 4 and the connecting rod 82, a pulling force can be provided to the connecting rod 82, so that the connecting rod 82 can maintain normal rotation while playing a shock absorbing function.

[0052] At least two bearings include a second bearing 85, which is a deep groove ball bearing and is accommodated at the upper end of the piston 4. The inner wall of the piston 4 is provided with a second bearing groove 44, in which the second bearing 85 is accommodated, and the second inner ring 850 of the second bearing 85 fixes and supports the connecting rod 82, so as to keep the connecting rod 82 stable and prevent it from swinging. The first bearing groove 43 is connected to 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 connected to the second bearing groove 44. The 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) 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 the high-speed rotation is smoother.

[0053] At least two bearings include a third bearing 86, which is an angular contact ball bearing and is accommodated at 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 annular groove 826. The third bearing 86 is accommodated in both the third bearing groove 45 and the third annular groove 826, and the third inner ring 860 of the third bearing 86 fixes and supports the connecting rod 82 to maintain 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 annular 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 annular 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 , it is possible to ensure that the connecting rod 82 does not swing, while ensuring the tension of the connecting rod 82 .

[0054] A first boss 825 is provided at one end of the connecting rod 82, and a gasket 87 is provided between the first boss 825 and the first bearing 84. The gasket is sleeved on the connecting rod 82 and one end of the gasket abuts against the first boss 825 and the other end abuts against the first bearing 84. Specifically, the first boss 825 is provided at the upper end of the connecting rod 82, and the fourth boss 870 is provided at the lower end of the gasket 87. 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 gasket 87 abuts against the first end surface 822 of the first boss 825. By using the gasket 87, the distance between the first bearing 84 and the connecting rod 82 is made up, so that the relative movement between the piston 4 and the connecting rod 82 is more stable, and the sealing is also improved to prevent oil leakage.

[0055] The stabilizing device also includes a limiter 88 and a locking member 89, the limiter 88 is fixedly connected to the locking member 89, and both the limiter 88 and the locking member 89 are sleeved on the connecting rod 82. Specifically, the limiter 88 and the locking member 89 are both provided with internal threads, and the corresponding second outer wall 821 of the connecting rod 82 is provided with external threads, and the limiter 88 is fixedly connected to the connecting rod 82 through threads and abuts against the third bottom 862 of the third bearing 86. The locking member 89 is fixedly connected to the connecting rod 82 through threads, and the locking member 89 is fixedly connected to the limiter 88 through screws. The limiter 88 can limit the position of the third bearing 86 to ensure that the third bearing 86 can work normally.

[0056] The hydraulic rivet gun of the present invention is also provided with a buffer device. Figures 7 to 9As shown, the buffer device includes a rivet screw 83 and an elastic member 833. One end of the elastic member 833 is connected to the connecting rod 82, and the other end is connected to 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. By arranging the elastic member 833 between the connecting rod 82 and the rivet screw 83, the high-speed rotation of the connecting rod 82 driven by the driver 81 is buffered, thereby achieving deceleration and ensuring the quality of the rivet. In addition, by arranging the elastic member 833 instead of the reducer, the structure is simple and the weight of the hydraulic rivet gun itself is reduced.

[0057] Among them, a third boss 837 is provided at 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 to the upper end surface of the rivet screw 83. Among them, a bolt 345 is fixedly connected to the bottom of the connecting rod 82, 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. The buffer device also includes a connecting sleeve 830, and 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 is slidably sleeved on the rivet screw 83, and the third boss 837 is accommodated in the connecting sleeve 830. Specifically, the interior of the connecting sleeve 830 is connected 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 in the shape of an elongated strip, and arcuate surfaces 845 are arranged at both ends thereof. The arcuate surfaces 845 abut against the inner wall of the connecting sleeve 830 .

[0058] The buffer device also includes a pin 831, a first through hole 834 is provided on the rivet screw 83, and a pair of waist-shaped through holes 835 symmetrical along the axis of the rivet screw 83 are provided on the connecting sleeve 830. The pin 831 is accommodated in the first through hole 834 and the two ends are accommodated in the pair of waist-shaped through holes 835 respectively. The pin 831 is clearance-matched with the rivet screw 83. When the elastic member 833 drives the rivet screw 83 to slide up and down in the connecting sleeve 830, the latch 831 can slide in the waist-shaped through hole 835 driven by the rivet screw 83, and the sliding distance of the rivet screw 83 in the connecting sleeve 830 is equal to the sliding distance of the latch 831 in the waist-shaped through hole 835. When the rivet screw 83 is withdrawn, the pin 831 and the 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 rivet screw 83 can be withdrawn more smoothly. At the same time, when the rivet gun rotates, there will be a downward pressure on the rivet. By inserting the pin rod 831 into the rivet screw 83, and accommodating the two ends of the pin rod 831 in the waist-shaped through hole 835 of the connecting sleeve 830, the pin rod 831 presses against the waist-shaped through hole 835, thereby ensuring the downward pressure of the rivet screw 83.

[0059] The buffer device also includes a retaining spring 832, which is sleeved on the connecting sleeve 830 and connected to the pin rod 831. The pin rod 831 has arc grooves 836 at both ends, and the retaining spring 832 is detachably engaged in the arc grooves 836. The retaining spring 832 is made of spring steel and has a notch 838 for disassembly. When either end of the pin rod 831 is located in the notch 838, the retaining spring 832 can be removed from the pin rod 831. By providing the retaining spring 832, the pin rod 831 can be prevented from being thrown out of the rivet screw rod 83 when the rivet screw rod 83 rotates, thereby ensuring the smooth progress of the rivet work.

[0060] During operation, the driver 81 and the connecting rod 82 rotate at high speed, driving the rivet screw 83 to rotate into the rivet (not shown in the figure), and then the hydraulic oil is pressurized by the supercharger (not shown in the figure) and quickly rushes into the hydraulic oil pipe 80, pushing the piston 4 to move axially, and the piston 4 drives the connecting rod 82 and the rivet screw 83 to move axially to complete the riveting process.

[0061] The present invention can withstand high pressure when dealing with the impact of high-pressure oil by providing a first main seal 10 disposed on the first outer portion 40 of the piston 4 and connected to the cylinder body 6 and a second main seal 20 disposed on the inner side of the pressure ring 5 and connected to the piston 4, and the pressure bearing level is increased from 25MPa to 40MPa, and plays a main sealing role with good sealing effect. By providing a first auxiliary seal 11 disposed on the first outer portion 40 of the piston 4 and connected to the cylinder body 6 and a second auxiliary seal 21 disposed on the inner side of the pressure ring 5 and connected to the piston 4, a good sealing effect can be achieved when dealing with low pressure. By providing a third seal 12 disposed on the first outer portion 40 of the piston 4 and connected to the cylinder body 6, hydraulic oil and gas can be sealed at the same time, and dustproof can be achieved. By providing a first static seal 30 and a second static seal 31 sleeved on the pressure ring 5 and abutting against the cylinder body 6, the static seal performance of the pressure ring 5 and the cylinder body 6 is improved, and the structure is simple and easy to replace. By providing the first main seal 10, the second main seal 20 and the first static seal 30 close to the oil chamber 800, the sealing is more timely and effective. By setting a plurality of 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 extended, the replacement frequency of the sealing element is reduced, and the sealing, stability and durability of the entire sealing device are improved. By setting a first guide element 70 between the piston 4 and the cylinder body 6, and a second guide element 71 between the piston 4 and the pressure ring 5, friction between the piston 4 and the cylinder body 6, and between the piston 4 and the pressure ring 5 is prevented, and the cylinder body 6, the piston 4 and the pressure ring 5 are protected from damage. By setting a dustproof element 72, dust can be prevented from entering the cylinder body and damaging the sealing element, thereby extending the service life of the sealing element.

[0062] The present invention also provides a second bearing 85 between the piston 4 and the connecting rod 82, which can ensure that the connecting rod 82 does not swing, and the high-speed rotation is smoother. By providing a first bearing 84 between the piston 4 and the connecting rod 82, a pulling force can be provided to the connecting rod 82, so that the connecting rod 82 can maintain normal rotation and can play a shock-absorbing function. By providing a third bearing 86 between the piston 4 and the connecting rod 82, it can ensure that the connecting rod 82 does not swing, and at the same time ensure the pulling force of the connecting rod 82.

[0063] The present invention provides an elastic member 833 between the connecting rod 82 and the rivet screw 83 to buffer the high-speed rotation of the connecting rod 82 driven by the driver 81, thereby achieving deceleration and ensuring the quality of the rivet. The elastic member 833 is provided to replace the reducer, and the structure is simple, and the weight of the hydraulic rivet gun itself is reduced. By inserting the pin 831 into the rivet screw 83, and accommodating both ends of the pin 831 in the waist-shaped through hole 835 of the connecting sleeve 830, when the rivet screw 83 is withdrawn, the pin 831 and the 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 rivet screw 83 can be withdrawn more smoothly. When the rivet gun is rotated, there is a downward pressure on the rivet. By inserting the pin 831 into the rivet screw 83, and accommodating the two ends of the pin 831 in the waist-shaped through hole 835 of the connecting sleeve 830, the pin 831 is against the waist-shaped through hole 835, thereby ensuring the downward pressure of the rivet screw 83. By providing the retaining spring 832, it is possible to prevent the pin 831 from being thrown out of the rivet screw 83 when the rivet screw 83 rotates, thereby ensuring the smooth progress of the rivet work.

[0064] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A sealing device for a hydraulic rivet gun, the hydraulic rivet gun comprising a piston (4), a pressure ring (5), and a cylinder (6), the piston (4) being slidably accommodated in the cylinder (6), the pressure ring (5) being accommodated at one end of the cylinder (6) and sleeved on the piston (4), an oil chamber (800) for accommodating hydraulic oil being formed between the piston (4) and the pressure ring (5), characterized in that: The sealing device comprises at least two groups of sealing components, and the at least two groups of sealing components comprise a first sealing component (1) and a second sealing component (2). The first sealing component (1) is arranged between the piston (4) and the cylinder body (6), and the first sealing component (1) is fixedly sleeved on the piston (4) and abuts against the cylinder body (6), thereby forming a first radial seal between the piston (4) and the cylinder body (6); the second sealing component (2) is arranged between the pressure ring (5) and the piston (4), and the second sealing component (2) is fixedly embedded in the pressure ring (5) and abuts against the piston (4), thereby forming a second radial seal between the pressure ring (5) and the piston (4).

2. The sealing device of the hydraulic rivet gun according to claim 1, characterized in that: The first sealing assembly (1) comprises a first main seal (10), which is a step seal ring. A first groove (90) is provided on the outer wall of the piston (4). The first main seal (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) to seal the high-pressure hydraulic oil.

3. The sealing device of the hydraulic rivet gun according to claim 2, characterized in that: The first sealing assembly (1) also includes a first secondary sealing member (11), which is a YX-type sealing ring. A second groove (91) is also provided on the outer wall of the piston (4). The first secondary sealing member (11) is accommodated in the second groove (91) and simultaneously abuts against the inner wall of the second groove (91) and the inner wall of the cylinder body (6) for sealing the low-pressure hydraulic oil.

4. The sealing device of the hydraulic rivet gun according to claim 2, characterized in that: The first sealing assembly (1) also includes a third sealing member (12). A third groove (92) is also provided on the outer wall of the piston (4). The third sealing member (12) is accommodated in the third groove (92) and simultaneously abuts against the inner wall of the third groove (92) and the inner wall of the cylinder body (6) for sealing the gas.

5. The sealing device of the hydraulic rivet gun according to claim 1, characterized in that: The second sealing assembly (2) includes a second main seal (20), which is a step seal ring. A fourth groove (93) is provided on the inner side of the pressure ring (5). The second main seal (20) is accommodated in the fourth groove (93) and is in contact with the inner wall of the fourth groove (93) and the inner wall of the connecting rod (82) to seal the high-pressure hydraulic oil.

6. The sealing device of the hydraulic riveting gun according to claim 5, characterized in that: The second sealing assembly (2) also includes a second secondary seal (21), which is a YX-type sealing ring. A fifth groove (94) is also provided on the inner side of the pressure ring (5). The second secondary seal (21) is accommodated in the fifth groove (94) and is simultaneously in contact with the inner wall of the fifth groove (94) and the inner wall of the connecting rod (82) for sealing the high-pressure hydraulic oil.

7. The sealing device of the hydraulic riveting gun according to claim 1, characterized in that: The at least two sets of sealing components also include a third sealing component (3), which is arranged between the pressure ring (5) and the cylinder body (6). The third sealing component (3) is fixedly sleeved on the pressure ring (5) and abuts against the cylinder body (6) to form a third radial seal between the pressure ring (5) and the cylinder body (6).

8. The sealing device of the hydraulic riveting gun according to claim 7, characterized in that: The third sealing assembly (3) includes a first static seal (30) and a second static seal (31). A sixth groove (95) and a seventh groove (96) are provided on the outer side of the pressure ring (5). 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). 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).

9. The sealing device of the hydraulic riveting gun according to claim 8, characterized in that: The pressure ring (5) comprises a body (52), the outer wall of the body (52) abuts against the inner wall of the cylinder (66), and the inner wall of the body (52) abuts against the outer wall of the piston (4).

10. The sealing device of the hydraulic riveting gun according to claim 9, characterized in that: The pressure ring (5) further comprises a second boss (53) which is formed to protrude outward relative to the body (52), and the second boss (53) is fixedly connected to the bottom of the cylinder body (6).

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