[0041] Example one
[0042] Reference figure 1 This invention discloses a durable hydraulic cylinder, which includes a casing 4, one end of the casing 4 is slidably connected with a piston rod 1 moving along its axis, and the end of the casing 4 facing away from the piston rod 1 is welded with a cylinder tail earring 5.
[0043] Reference figure 2 with image 3 , The housing 4 includes a cylinder head 41, a cylinder tube 42 is detachably connected to the cylinder head 41, a cylinder tail 43 is detachably connected to the cylinder tube 42, and a cylinder body 44 is detachably connected to the cylinder tail 43; the cylinder head 41, the cylinder tube 42. Both the cylinder tail 43 and the cylinder body 44 are round pipes whose center lines coincide. The cylinder head 41, the cylinder tube 42, the cylinder tail 43, and the cylinder body 44 are detachably connected in sequence.
[0044] Reference figure 2 , image 3 with Image 6 The structure of the cylinder head 41 is a circular tube. The outer ends of the cylinder head 41 are respectively provided with an annular first groove 413 and an annular second groove 414. The outer diameters of the first groove 413 and the second groove 414 are the same. The inner diameter of the groove 413 is greater than the inner diameter of the second groove 414. The second groove 414 is located at the end of the cylinder head 41 close to the cylinder 42. The inner diameter of the second groove 414 is the same as the inner diameter of the cylinder 42. There are three grooves 415, the third groove 415 is a round groove, and the third groove 415 is embedded with a static seal ring. The inside of the cylinder head 41 is integrally provided with a first ring 416 with an inner diameter smaller than the diameter of the cylinder head 41. The first ring 416 is a circular ring. The outer diameter of the first ring 416 is the same as the inner diameter of the cylinder head 41. The groove 413 and the second groove 414 are in the area between the axial direction of the cylinder head 41. The outer surface of the cylinder head 41 is provided with a front oil hole 411. The front oil hole 411 includes a threaded hole opened on the outside of the cylinder head 41. The bottom surface of the threaded hole is provided with a through hole passing through the first ring 416 and communicating with the inner cavity of the first ring 416 .
[0045] Reference figure 2 , image 3 with Image 6 A front detection hole 412 is provided on the outer side of the cylinder head 41. The front detection hole 412 includes a threaded hole opened on the outer side of the cylinder head 41. The bottom surface of the threaded hole is provided with a through hole that passes through the first ring 416 and communicates with the inner cavity of the first ring 416. The front detection hole 412 and the front oil hole 411 are arranged at intervals along the circumference of the cylinder head 41, and the axes of the front detection hole 412 and the front oil hole 411 are along the radial direction of the cylinder head 41. The end surface of the cylinder head 41 with the first groove 413 is provided with threaded holes, 8 threaded holes are evenly distributed along the circumferential direction of the cylinder head 41, and the axis of the threaded holes is along the axis direction of the cylinder head 41.
[0046] Reference image 3 The front oil hole 411 is used to connect with the hydraulic pipe joint. In this embodiment, the front detection hole 412 is threadedly connected with a pressure measuring joint 45 that is in sealed communication with the inner cavity of the cylinder head 41. The front detection hole 412 can also be connected with the front detection Hole 412 is connected to the plug.
[0047] Reference figure 2 , image 3 with Image 6 The cylinder head 41 is located on the bottom surface of the first groove 413 and is provided with a through hole passing through the bottom surface of the second groove 414. The axis of the through hole is parallel to the axis of the cylinder head 41. There are 11 through holes spaced along the circumference of the cylinder head 41. The front oil hole 411 and the front detection hole 412 are mutually staggered, a screw is inserted in the through hole, and an elastic washer in the first groove 413 is sleeved on the screw.
[0048] Reference figure 2 with image 3 The structure of the cylinder 42 is a round tube. The outer ends of the cylinder 42 are respectively provided with external threads. The two ends of the cylinder 42 are respectively screwed with a circular cylinder flange 421. The diameter is the same as the outer diameter of the cylinder head 41. The inner side of the cylinder flange 421 is provided with an internal thread that matches the external thread of the cylinder 42. The cylinder flange 421 is provided with a threaded hole corresponding to the screw of the cylinder head 41. The screw on the head 41 passes through the cylinder head 41 and is threadedly connected with the cylinder flange 421 of the two cylinder flanges 421 which is close to the cylinder head 41.
[0049] Reference figure 2 with Figure 4 The end surface of the cylinder barrel 42 facing away from the cylinder head 41 is provided with a fourth groove 422. The fourth groove 422 is an annular groove. The outer diameter of the fourth groove 422 is equal to the outer diameter of the cylinder 42. The inner diameter of the fourth groove 422 is larger than that of the cylinder. The inner diameter of the barrel 42.
[0050] Reference figure 2 , Figure 4 with Figure 7 , The end of the cylinder tube 42 facing away from the cylinder head 41 is connected with a cylinder tail 43 using screws. The structure of the cylinder tail 43 is a round tube. The end of the cylinder tube 42 facing away from the cylinder tube 42 is provided with a fifth groove 433. The fifth groove 433 is An annular groove, the outer diameter of the fifth groove 433 is the same as the outer diameter of the cylinder tail 43, and the inner diameter of the fifth groove 433 is smaller than the outer diameter of the cylinder 44 and larger than the inner diameter of the cylinder 44. The end of the cylinder tail 43 facing away from the cylinder tube 42 is provided with a sixth groove 434. The sixth groove 434 is an annular groove. The inner diameter of the sixth groove 434 is the same as that of the cylinder tail 43. The outer diameter of the sixth groove 434 is smaller than that of the fifth groove. The inner diameter of 433. The end surface of the cylinder tail 43 facing away from the cylinder tube 42 is provided with eight threaded holes evenly spaced along the circumference of the cylinder tail 43. The ring where the eight threaded holes are located is between the outer diameter of the sixth groove 434 and the inner diameter of the fifth groove 433. between.
[0051] Reference figure 2 , Figure 4 with Figure 7 The end surface of the cylinder tail 43 facing the cylinder tube 42 is provided with a seventh groove 435. The seventh groove 435 is an annular groove. The inner diameter of the seventh groove 435 is the same as that of the cylinder tail 43. The outer diameter of the seventh groove 435 is equal to the fourth The inner diameter of the groove 422. The side of the seventh groove 435 is provided with an eighth groove 436, the eighth groove 436 is an annular groove, and the eighth groove 436 is embedded with a static seal ring. The bottom surface of the eighth groove 436 is provided with a ninth groove 437. The ninth groove 437 is a fan-shaped groove. The axis of the ninth groove 437 is coaxial with the axis of the eighth groove 436 and coincides with the axis of the cylinder tail 43. The diameter is smaller than the outer diameter of the eighth groove 436, and the inner diameter of the ninth groove 437 is equal to the inner diameter of the cylinder tail 43. The bottom surface of the eighth groove 436 is provided with a tenth groove 438. The tenth groove 438 is an annular groove. The inner diameter of the tenth groove 438 is the same as the inner diameter of the cylinder tail 43. The outer diameter of the tenth groove 438 is smaller than the outer diameter of the eighth groove 436. path. The inner surface of the cylinder tail 43 is provided with a detection groove 439. The detection groove 439 is located between the seventh groove 435 and the sixth groove 434. The detection groove 439 is an annular groove. The detection groove 439 communicates with the ninth groove 437. The inner diameter of the detection groove 439 Equal to the inner diameter of the cylinder tail 43, the outer diameter of the detection groove 439 is smaller than the outer diameter of the tenth groove 438. The bottom surface of the fifth groove 433 is provided with through holes arranged in the circumferential direction of the cylinder tail 43. Eleven through holes are provided, and the axis of the through hole is parallel to the axis of the cylinder tail 43.
[0052] Reference figure 2 , Figure 4 with Figure 7 A rear oil hole 431 is formed on the outer surface of the cylinder tail 43. The rear oil hole 431 includes a threaded hole opened on the outside of the cylinder tail 43. The bottom surface of the threaded hole is provided with a through hole communicating with the inner cavity of the ninth groove 437. The outer surface of the cylinder tail 43 is provided with a rear detection hole 432. The rear detection hole 432 includes a threaded hole opened on the outside of the cylinder tail 43. The bottom surface of the threaded hole is provided with a through hole communicating with the inner cavity of the cylinder tail 43. The rear detection hole 432 and the rear The oil holes 431 are arranged at intervals along the circumference of the cylinder head 41, and the axes of the rear detection holes 432 and the rear oil holes 431 are along the radial direction of the cylinder tail 43.
[0053] Reference Figure 4 , The rear oil hole 431 is used to connect with a hydraulic pipe joint. In this embodiment, the rear detection hole 432 is threadedly connected with a pressure measuring joint 45 that is in sealed communication with the inner cavity of the cylinder tail 43. A plug can also be connected in the rear detection hole 432 to close the rear detection hole 432.
[0054] Reference figure 2 with Figure 4 The structure of the cylinder body 44 is a circular tube structure. The cylinder body 44 is provided with a relief groove 444 facing the end surface of the cylinder tail 43. The relief groove 444 is an annular groove. The inner diameter of the relief groove 444 is equal to the inner diameter of the cylinder body 44. The outer diameter of the groove 444 is equal to the inner diameter of the fifth groove 433 (refer to Figure 7 ). The cylinder body 44 is provided with external threads on the outside of one end facing the cylinder tail 43. The cylinder body 44 is threadedly connected to the cylinder flange 441 at the end facing the cylinder tail 43. The structure of the cylinder flange 441 is a circular ring. Through holes along the axial direction of the cylinder 44 are opened, and 12 through holes are arranged at intervals along the circumference of the cylinder flange 441. The cylinder flange 441 is equipped with 11 screws. The screws pass through the cylinder flange 441 and then pass through the cylinder tail 43, and then threadedly connect with the cylinder flange 421 near the cylinder tail 43 to realize the cylinder block 44 and the cylinder tail. 43. The detachable connection between the cylinders 42. The side of the cylinder 44 is provided with an air breathing hole 442 communicating with its inner cavity. The air hole is a threaded hole with an axis along the radial direction of the cylinder 44. The side of the cylinder 44 is threadedly connected with an air filter 443 through the air breathing hole 442. In this embodiment, a C-type air filter 443 is used.
[0055] Reference figure 2 The end of the cylinder body 44 facing away from the cylinder tail 43 is welded with a cylinder tail earring 5, which includes a disc with the same diameter as the outer diameter of the cylinder body 44. The end face of the disc facing the cylinder body 44 is integrally provided with a ring. The outer diameter of the ring is the same as the inner diameter of the cylinder body 44. The end face of the disc facing away from the cylinder body 44 is integrally provided with a square plate, and one end of the square plate facing away from the disc is integrally provided with a semicircular disc. The square plate and the semicircular disc are provided There is a cylinder tail hole 51, and the axis of the cylinder tail hole 51 is perpendicular to the axis of the cylinder 44.
[0056] Reference figure 2 , The inner side of the cylinder tail hole 51 is provided with two spaced connecting grooves, the connecting groove is a circular groove whose axis coincides with the axis of the cylinder tail hole 51, and the two connecting grooves are respectively provided with a shaft elastic retaining ring 19, two shafts A radial joint bearing 18 is arranged between the elastic retaining rings 19. The side of the square plate is provided with a lubrication hole, the lubrication hole is a threaded hole, the port of the lubricating hole extending into the cylinder tail hole 51 is located between the two connecting grooves, and a straight-through oil cup 17 is threadedly connected to the lubricating hole.
[0057] Reference figure 2 with Figure 5 The piston rod 1 includes a cylinder head earring 11, the end of the cylinder head earring 11 facing the cylinder head 41 is integrally provided with a front rod 12, and the end of the front rod 12 facing away from the cylinder head earring 11 is integrally provided with a connector coaxial with the front rod 12 13. The connecting head 13 is detachably connected with a piston 14 coaxial with it, and the piston 14 is integrally provided with a rear rod 15 coaxial with it.
[0058] Reference figure 2 , The cylinder head earring 11 includes a semi-circular disc, the flat end of the semi-circular disc is integrally provided with a trapezoidal plate, the lower bottom of the trapezoidal plate is connected with the semi-circular disc, and the end of the trapezoidal plate facing away from the semi-circular disc is integrally provided with a disc. The axis of is along the axis direction of the cylinder head 41, and the inner diameter of the disc is larger than the inner diameter of the first ring 416. A cylinder head hole 111 with an axis perpendicular to the axis of the cylinder head 41 is opened on the semi-circular disk.
[0059] Reference figure 2 , The inner side of the cylinder head hole 111 is provided with two spaced connecting grooves. The connecting grooves are circular grooves whose axis coincides with the axis of the cylinder head hole 111. The connecting grooves are respectively provided with elastic retaining rings 19 for the shaft, and the two shafts are elastic A radial joint bearing 18 is provided between the retaining rings 19. The side of the square plate is provided with a lubrication hole, the lubrication hole is a threaded hole, the port of the lubricating hole extending into the cylinder head hole 111 is located between the two connecting grooves, and a straight-through oil cup 17 is threadedly connected to the lubricating hole.
[0060] Reference figure 2 with Figure 5 , The front rod 12 is a round rod integrally provided with the disc on the cylinder head earring 11, and the outer diameter of the round rod is equal to the inner diameter of the first ring 416. The connecting head 13 includes a transition rod integrated with the front rod 12. The transition rod is a round rod with a diameter smaller than that of the front rod 12. The transition rod and the front rod 12 are chamfered for transition, and the connecting head 13 includes a transition rod integrated on the back of the transition rod. The screw at one end of the rod 12 is provided with external threads on the outer surface of the screw, and the outer diameter of the screw is smaller than the outer diameter of the transition rod.
[0061] Reference figure 2 with Figure 5 , The structure of the piston 14 is a round cap, the opening of the piston 14 faces the front rod 12, the outer diameter of the piston 14 is equal to the inner diameter of the cylinder 42, and the end of the piston 14 facing the front rod 12 is provided with a transition hole 144. The diameter of the transition hole 144 is the same as The diameter of the transition rod is the same, and the transition rod can be inserted into the transition hole 144. The bottom surface of the transition hole 144 is provided with an inner connecting hole 145. The inner connecting hole 145 is a threaded hole. The connecting head 13 is screwed into the inner connecting hole 145 to realize the connecting head 13 and Removable connection of the piston 14. The end of the piston 14 facing the front rod 12 is provided with a third outer groove 143. The third outer groove 143 is an annular groove. The outer diameter of the third outer groove 143 is the same as the outer diameter of the piston 14, and the inner diameter of the third outer groove 143 is larger than the transition hole. With a diameter of 144, the side of the third outer groove 143 is provided with fastening screw holes, the fastening screw holes communicate with the inner cavity of the inner connecting hole 145, and two fastening screw holes are arranged along the circumference of the piston 14 at intervals. A set screw 16 is threadedly connected to the set screw hole. After the connecting head 13 and the piston 14 are threadedly connected, the set screw 16 is rotated so that the set screw 16 penetrates the inner connecting hole 145 and contacts the side surface of the connecting head 13 for compression.
[0062] Reference figure 2 with Figure 5 The side of the piston 14 is provided with a first outer groove 141, the first outer groove 141 is an annular groove, the first outer groove 141 is provided with two spaced apart along the axis of the piston 14, and the side of the piston 14 is provided with a second outer groove 142. The second outer groove 142 is an annular groove. The outer diameter of the second outer groove 142 is the same as the outer diameter of the piston 14. The inner diameter of the second outer groove 142 is smaller than the first outer groove 141 and larger than the inner diameter of the first outer groove 141.
[0063] Reference figure 2 with Figure 5 The structure of the rear rod 15 is a round rod with the same diameter as the front rod 12, and a relief groove is provided at the connection between the rear rod 15 and the piston 14. The rear rod 15 is provided with a chamfer on the outer side of one end facing away from the piston 14 and a process hole is provided on the inner side.
[0064] Reference figure 2 , The cylinder head earring 11 is sleeved with a dust cover 7, one end of the dust cover 7 is connected with the cylinder head earring 11, and the other end is connected with the cylinder head 41. The dust cover 7 can be along the axis of the cylinder head 41 The direction stretches.
[0065] Reference figure 2 , Figure 4 with Figure 5 , The piston 14 is provided with a middle sealing mechanism 6, which includes a support ring 61 embedded in two first outer grooves 141, respectively, the support ring 61 is a guide ring for the piston, the support ring 61 is a copper alloy ring, the support ring 61 can support the piston 14 and improve the stability of the piston 14 when sliding. The middle sealing mechanism 6 includes a Gly ring 62 embedded in the second outer groove 142, and the Gly ring 62 is a Gly ring 62 for shaft. The Gly ring 62 includes an O-ring 621 in contact with the inner surface of the second outer groove 142 and a PTFE ring 622 located outside the O-ring 621. The side of the PTFE ring 622 is in contact with the inner surface of the cylinder 42 The compression maintains the seal between the piston 14 and the cylinder 42.
[0066] Reference figure 2 , Figure 4 with Figure 7 A rear sealing mechanism 3 is provided on the outside of the rear rod 15. The rear sealing mechanism 3 includes a rear guide sleeve 32 sleeved on the outside of the rear rod 15. The rear guide sleeve 32 is a circular ring made of aluminum bronze, and the rear guide sleeve 32 The inner diameter of the rear rod 15 is equal to the diameter of the rear rod 15, the outer diameter of the rear guide sleeve 32 is equal to the outer diameter of the sixth groove 434, the rear guide sleeve 32 is located inside the cylinder tail 43, the rear guide sleeve 32 abuts against the piston 14, the rear guide sleeve 32 faces the piston A rear step groove 321 is opened on the outer side of one end of the rear step groove 321. The outer diameter of the rear step groove 321 is equal to the outer diameter of the rear guide sleeve 32, and the inner diameter of the rear step groove 321 is equal to the inner diameter of the cylinder tail 43.
[0067] Reference figure 2 , Figure 4 with Figure 7 The rear sealing mechanism 3 includes a rear sealing gland 31 that is bolted to the end of the cylinder tail 43 facing away from the cylinder tube 42. The rear sealing gland 31 includes an outer ring whose inner diameter is the same as the diameter of the rear rod 15. The outer diameter is the same as the outer diameter of the relief groove 444. The outer ring is provided with through holes, and 8 through holes are evenly spaced along the outer ring circumferential direction. The outer ring is provided with through holes passing through the cylinder tail 43. 8 screws connected by threaded holes, and elastic washers are sleeved on the screws. An inner ring is integrally provided on the outer ring, the inner diameter of the inner ring is the same as the inner diameter of the outer ring, and the outer diameter of the inner ring is equal to the outer diameter of the sixth groove 434.
[0068] Reference figure 2 , Figure 4 with Figure 7 The rear sealing mechanism 3 includes a rear U-shaped rod sealing ring 33 sleeved outside the rear rod 15 and located between the rear sealing gland 31 and the rear guide sleeve 32, and the rear U-shaped rod sealing ring 33 is a one-way sealing ring The rear U-shaped rod sealing ring 33 is pressed by the rear sealing gland 31 and the rear guide sleeve 32, and the rear U-shaped rod sealing ring 33 restricts the liquid in the cylinder 42 from entering the cylinder 44.
[0069] Reference figure 2 , image 3 with Image 6 A front sealing mechanism 2 is provided on the outside of the front rod 12. The front sealing mechanism 2 includes a front guide sleeve 22 sleeved on the outside of the front rod 12. The front guide sleeve 22 is a circular ring made of aluminum bronze. The front guide sleeve 22 Before the inner diameter is equal to the diameter of the front rod 12, the outer diameter of the front guide sleeve 22 is equal to the inner diameter of the cylinder head 41, the front guide sleeve 22 is located inside the cylinder head 41, and the end of the front guide sleeve 22 facing away from the cylinder head earring 11 abuts against the first Ring 416, the front guide sleeve 22 is provided with a front step groove 221 toward the inner side of one end of the piston 14. The inner diameter of the front step groove 221 is equal to the diameter of the front rod 12, and the front step groove 221 is provided with a front U sleeved outside the front rod 12 The seal ring 24 for the shaped rod, the seal ring 24 for the front U-shaped rod and the seal ring 33 for the rear U-shaped rod have the same specifications. The outer surface of the front guide sleeve 22 is provided with an outer sealing groove 222, and a static sealing ring is embedded in the outer sealing groove 222. The static sealing ring realizes a tight seal between the front guide sleeve 22 and the inner surface of the cylinder head 41.
[0070] Reference figure 2 , image 3 with Image 6 The front sealing mechanism 2 includes a front sealing gland 21 bolted to one end of the cylinder head 41 facing away from the cylinder tube 42. The front sealing gland 21 includes a large ring whose inner diameter is the same as that of the front rod 12. The outer diameter is the same as the inner diameter of the first groove 413, the large ring is provided with through holes, and the through holes are evenly distributed along the circumference of the large ring. The large ring is provided with threads passing through the through holes and the cylinder head 41. 8 screws connected by threaded holes, and elastic washers are sleeved on the screws. One end of the outer ring facing the cylinder head 41 is integrally provided with a small ring coaxial therewith, and the outer diameter of the small ring is equal to the inner diameter of the cylinder head 41. After the front sealing gland 21 exerts a pressing action on the front U-shaped rod sealing ring 24, the front U-shaped rod sealing ring 24 restricts the liquid in the cylinder 42 from flowing out of the gap between the front sealing gland 21 and the front rod 12. .
[0071] Reference figure 2 , The front sealing gland 21 is provided with a small inner ring groove on the inner side of the end surface facing away from the cylinder head 41, the inner diameter of the small inner ring groove is equal to the inner diameter of the front sealing gland 21, and the bottom surface of the small inner ring groove is provided with a large inner ring groove. The inner diameter of the inner ring groove is equal to the inner diameter of the front sealing gland 21, and the outer diameter of the large inner ring groove is larger than the outer diameter of the small inner ring groove and smaller than the outer diameter of the small ring. The end surface of the front sealing gland 21 facing away from the cylinder head 41 is embedded with a double-lip seal ring 23 located in the small inner ring groove and the large inner ring groove.
[0072] The working process of the above embodiment is:
[0073] After connecting the two hydraulic pipe joints with the front oil hole and the rear oil hole, when the high pressure hydraulic oil enters the rear oil hole, the high pressure oil in the cylinder barrel flows out through the front oil hole, and the hydraulic oil pushes the piston along the cylinder barrel The inner side slides, the piston drives the rear rod to slide along the inner side of the rear guide sleeve, the piston pushes the front rod connected with the piston through the connector to move, the front rod moves along the side of the front guide sleeve, and the front rod drives the cylinder head earring back to the cylinder tail earring direction Move; when the current oil hole enters the high-pressure oil, the high-pressure oil in the cylinder barrel is cleaned and the oil hole flows out, and the hydraulic oil pushes the cylinder head earring to move toward the cylinder end earring, thereby realizing the difference between the upper cylinder head earring and the cylinder end earring of the hydraulic cylinder Reciprocating movement between.
