Durable hydraulic cylinder

Abstract

This invention discloses a durable hydraulic cylinder, comprising a housing, within which a piston rod slides along the inner cavity of the housing; the housing includes a cylinder head, a cylinder barrel detachably connected to the cylinder head, a cylinder tail detachably connected to the cylinder barrel, and a cylinder body detachably connected to the cylinder tail; the center lines of the inner cavities of the cylinder head, cylinder barrel, cylinder tail, and cylinder body coincide; a cylinder tail lug is fixedly provided at the end of the cylinder body facing away from the cylinder tail; the piston rod includes a cylinder head lug and a front rod integrally formed with the cylinder head lug, a piston detachably connected to the front rod, the piston sliding along its own center line on the inner wall of the cylinder barrel, and a rear rod integrally formed on the piston; a front oil hole communicating with the inner cavity of the cylinder head and the inner cavity of the cylinder barrel is provided on the side of the cylinder head; a rear oil hole communicating with the inner cavity of the cylinder tail and the inner cavity of the cylinder barrel is provided on the side of the cylinder tail. This invention improves the structural strength of the connection between the cylinder head and the front rod of the hydraulic cylinder.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder technology, and in particular to a durable hydraulic cylinder. Background Technology

[0002] With the continuous expansion of the scale of new dry process cement production lines, the number of grate coolers used is also increasing. The grate cooler is an important main equipment in the clinker calcination system of cement plants. It is mainly used to cool and transport cement clinker; at the same time, it provides hot air for rotary kilns and decomposition furnaces, and is the main equipment for heat recovery in the calcination system.

[0003] In terms of transmission type for grate coolers, hydraulic transmission has advantages such as smooth transmission, convenient speed adjustment, good reliability, and high operating rate.

[0004] Chinese utility model patent with authorization announcement number CN2861625Y discloses a hydraulic transmission device for a grate cooler, including a circulating cooling and filtration system, an oil tank, a pump and valve control station, a hydraulic cylinder, and an electrical control section. The hydraulic cylinder moves to meet the working requirements of the main equipment by supplying pressure oil to the external system through a high-pressure pump, a proportional valve, and other auxiliary components.

[0005] Chinese utility model patent with authorization announcement number CN201128721Y discloses a hydraulic transmission connection structure for a grate cooler, including a transmission shaft connected to the grate cooler and a shaft head that is coaxially rotatably connected via rolling bearings, and a piston rod of a hydraulic cylinder that is connected to the shaft head radially along the transmission shaft via threads.

[0006] The existing technical solutions mentioned above have the following drawbacks: the cylinder head and the front rod of the hydraulic cylinder are connected by a threaded connection, which has low strength. During the use of the hydraulic cylinder, the connection between the cylinder head and the front rod often breaks. Summary of the Invention

[0007] The purpose of this invention is to provide a durable hydraulic cylinder that improves the structural strength of the connection between the cylinder head lug and the front rod, thereby extending its service life.

[0008] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0009] A durable hydraulic cylinder includes a housing, within which a piston rod is disposed that slides along the inner cavity of the housing;

[0010] The outer casing includes a cylinder head, a cylinder barrel detachably connected to the cylinder head, a cylinder tail detachably connected to the cylinder barrel, and a cylinder body detachably connected to the cylinder tail; the inner center lines of the cylinder head, cylinder barrel, cylinder tail, and cylinder body coincide, and the cylinder head, cylinder barrel, cylinder tail, and cylinder body are arranged in sequence.

[0011] A cylinder tail lug is fixedly provided at one end of the cylinder body facing away from the cylinder tail.

[0012] The piston rod includes a cylinder head lug and a front rod integrally formed with the cylinder head lug. A piston is detachably connected to the front rod. The piston slides along its own center line on the inner wall of the cylinder. A rear rod is integrally formed on the piston.

[0013] The front rod is fitted with a front sealing mechanism located inside the cylinder head, the piston is fitted with a middle sealing mechanism located inside the cylinder, and the rear rod is fitted with a rear sealing mechanism located inside the cylinder tail.

[0014] The cylinder head has a front oil hole on its side that communicates with the inner cavity of the cylinder head and the inner cavity of the cylinder barrel; the cylinder tail has a rear oil hole on its side that communicates with the inner cavity of the cylinder tail and the inner cavity of the cylinder barrel.

[0015] The present invention is further configured such that cylinder flanges are fixedly connected to both ends of the outer side of the cylinder along its axial direction;

[0016] The cylinder head is fitted with screws that press and connect the rear of the cylinder head and the cylinder flange near the cylinder head, thereby achieving a detachable connection between the cylinder and the cylinder head.

[0017] A cylinder flange is fixedly connected to the outer side of the cylinder body facing the cylinder head. Screws are installed on the cylinder flange, and the screws press and connect the cylinder flange, the cylinder tail, and the cylinder barrel flange away from the cylinder head, so as to realize the detachable connection between the cylinder barrel, the cylinder tail, and the cylinder body.

[0018] The present invention is further configured such that: a front guide sleeve located in the inner cavity of the cylinder head is sleeved on the outer side of the front rod, and a rear guide sleeve located in the inner cavity of the cylinder tail is sleeved on the outer side of the rear rod;

[0019] The piston has a first outer groove on its side, and a support ring that contacts the inner side of the cylinder is embedded in the first outer groove. When the piston moves along the cylinder axis, the support ring slides along the inner side of the cylinder.

[0020] The present invention is further configured such that: a front step groove is provided on the inner side of the end of the front guide sleeve facing the piston; the front sealing mechanism includes a front U-shaped rod sealing ring located in the front step groove; and a front sealing cap that presses against the front U-shaped rod sealing ring is pressed and connected to the end of the cylinder head facing away from the cylinder barrel.

[0021] The inner side of the front sealing cover is provided with an annular groove, and a sealing ring is embedded in the annular groove;

[0022] The rear sealing mechanism includes a rear U-shaped rod sealing ring sleeved on the outside of the rear rod, and a rear sealing cap that presses against the rear U-shaped rod sealing ring is pressed and connected to the cylinder tail end opposite to the cylinder barrel.

[0023] The present invention is further configured such that: two spaced-apart grooves are provided on the side of the piston, and a second outer groove is provided on the side of the piston located between the two first outer grooves; the sealing mechanism includes a Glyd ring embedded in the second outer groove.

[0024] The present invention is further configured such that: a connector is integrally provided at one end of the front rod facing away from the cylinder head lug, the connector has an external thread on its side, and a threaded hole is provided at one end of the piston facing away from the rear rod, and the connector is threadedly connected to the piston.

[0025] The present invention is further configured such that: a set screw hole communicating with a threaded hole is provided on the side of the piston, and a set screw is threadedly connected to the set screw hole and pressed against the side of the connector.

[0026] The present invention is further configured such that: a front detection hole communicating with the inner cavity of the cylinder head is provided on the side of the cylinder head; and a rear detection hole communicating with the inner cavity of the cylinder tail is provided on the side of the cylinder tail.

[0027] The present invention is further configured such that an air breathing hole communicating with the inner cavity of the cylinder is provided on the outer side of the cylinder body.

[0028] The present invention is further configured such that: a cylinder tail hole is provided on the cylinder tail lug, and a bearing is provided in the cylinder tail hole; a retaining ring is embedded in the cylinder tail hole to restrict the ball bearing within the cylinder tail hole, and the retaining ring is in contact with the end face of the bearing;

[0029] The cylinder head lug has a cylinder head hole, and a bearing is installed inside the cylinder head hole; a retaining ring is embedded in the cylinder head hole to confine the bearing inside the cylinder head hole, and the retaining ring is in contact with the end face of the bearing.

[0030] In summary, the beneficial effects of the present invention are as follows:

[0031] 1. The cylinder head lug and the front rod are integrated, resulting in high structural strength and resistance to breakage, thus extending the service life of the hydraulic cylinder. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the embodiment;

[0033] Figure 2 This is a cross-sectional structural diagram of the embodiment;

[0034] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0035] Figure 4 yes Figure 2 Enlarged view at point B in the middle;

[0036] Figure 5This is a schematic diagram of the piston rod connection structure in the embodiment;

[0037] Figure 6 This is a schematic cross-sectional view of the cylinder head in the embodiment;

[0038] Figure 7 This is a schematic diagram of the cross-sectional structure of the cylinder tail in the embodiment.

[0039] In the diagram, 1. Piston rod; 11. Cylinder head lug; 111. Cylinder head bore; 12. Front rod; 13. Connector; 14. Piston; 141. First outer groove; 142. Second outer groove; 143. Third outer groove; 144. Transition hole; 145. Inner connecting hole; 15. Rear rod; 16. Set screw; 17. Straight-through oil cup; 18. Radial spherical bearing; 19. Shaft retaining ring; 2. Front sealing mechanism; 21. Front sealing gland; 22. Front guide sleeve; 221. Front stepped groove; 222. Outer sealing groove; 23. Double lip seal; 24. Seal for front U-shaped rod; 3. Rear sealing mechanism; 31. Rear sealing gland; 32. Rear guide sleeve; 321. Rear stepped groove; 33. Seal for rear U-shaped rod; 4. Housing; 41. Cylinder head; 411. Front oil cup 412. Front inspection hole; 413. First groove; 414. Second groove; 415. Third groove; 416. First ring; 42. Cylinder; 421. Cylinder flange; 422. Fourth groove; 43. Cylinder tail; 431. Rear oil hole; 432. Rear inspection hole; 433. Fifth groove; 434. Sixth groove; 435. Seventh groove; 436. Eighth groove; 437. Ninth groove; 438. Tenth groove; 439. Inspection groove; 44. Cylinder block; 441. Cylinder block flange; 442. Air breather hole; 443. Air filter; 444. Clearance groove; 45. Pressure test connector; 5. Cylinder tail lug; 51. Cylinder tail hole; 6. Middle sealing mechanism; 61. Support ring; 62. Glyd ring; 621. O-ring; 622. PTFE ring; 7. Dust cover. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the accompanying drawings.

[0041] Example 1

[0042] Reference Figure 1 The present invention discloses a durable hydraulic cylinder, including a housing 4, a piston rod 1 that moves along its axis is slidably connected to one end of the housing 4, and a cylinder tail lug 5 is welded to the end of the housing 4 facing away from the piston rod 1.

[0043] Reference Figure 2 and Figure 3The outer casing 4 includes a cylinder head 41, a cylinder barrel 42 detachably connected to the cylinder head 41, a cylinder tail 43 detachably connected to the cylinder barrel 42, and a cylinder body 44 detachably connected to the cylinder tail 43; the cylinder head 41, cylinder barrel 42, cylinder tail 43, and cylinder body 44 are all circular tubes with their center lines coincident, and the cylinder head 41, cylinder barrel 42, cylinder tail 43, and cylinder body 44 are detachably connected in sequence.

[0044] Reference Figure 2 , Figure 3 and Figure 6 The cylinder head 41 has a cylindrical tube structure. At its outer ends, an annular first groove 413 and an annular second groove 414 are respectively formed. The outer diameters of the first groove 413 and the second groove 414 are the same, while the inner diameter of the first groove 413 is larger than that of the second groove 414. The second groove 414 is located at the end of the cylinder head 41 closest to the cylinder barrel 42, and its inner diameter is the same as that of the cylinder barrel 42. A third groove 415, which is circular, is formed on the side of the second groove 414, and a static sealing ring is embedded within it. A first ring 416, with an inner diameter smaller than the cylinder head 41's diameter, is integrally formed on the inner side of the cylinder head 41. The first ring 416 is circular, and its outer diameter is the same as that of the cylinder head 41. The first ring 416 is located within the area between the first groove 413 and the second groove 414 along the axial direction of the cylinder head 41. A front oil hole 411 is provided on the outer side of the cylinder head 41. The front oil hole 411 includes a threaded hole on the outer side of the cylinder head 41. A through hole is provided on the bottom surface of the threaded hole, which passes through the first ring 416 and communicates with the inner cavity of the first ring 416.

[0045] Reference Figure 2 , Figure 3 and Figure 6 The cylinder head 41 has a front inspection hole 412 on its outer side. The front inspection hole 412 includes a threaded hole on the outer side of the cylinder head 41. The bottom surface of the threaded hole has a through hole that passes through the first ring 416 and communicates with the inner cavity of the first ring 416. The front inspection hole 412 and the front oil hole 411 are spaced apart around the cylinder head 41, and the axes of the front inspection hole 412 and the front oil hole 411 are along the radial direction of the cylinder head 41. The cylinder head 41 has a threaded hole on its end face where the first groove 413 is located. Eight threaded holes are evenly distributed around the cylinder head 41, and the axes of the threaded holes are along the axial direction of the cylinder head 41.

[0046] Reference Figure 3 The front oil hole 411 is used to connect to the hydraulic pipe connector. In this embodiment, the front detection hole 412 is threadedly connected to a pressure testing connector 45 that is in sealed communication with the inner cavity of its cylinder head 41. A plug connected to the front detection hole 412 can also be connected inside the front detection hole 412.

[0047] Reference Figure 2 , Figure 3 and Figure 6The cylinder head 41 has a through hole on the bottom surface of the first groove 413 that passes 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 apart along the circumference of the cylinder head 41. The through holes are staggered from the front oil hole 411 and the front detection hole 412. A screw is inserted in the through hole, and an elastic washer located in the first groove 413 is fitted on the screw.

[0048] Reference Figure 2 and Figure 3 The cylinder 42 is a round tube. Both ends of the outer side of the cylinder 42 are provided with external threads. Both ends of the cylinder 42 are threadedly connected to annular cylinder flanges 421. The outer diameter of the cylinder flanges 421 is the same as the outer diameter of the cylinder head 41. The inner side of the cylinder flanges 421 is provided with internal threads that mate with the external threads of the cylinder 42. The cylinder flanges 421 are provided with threaded holes that correspond to the screws on the cylinder head 41. The screws on the cylinder head 41 pass through the cylinder head 41 and are threadedly connected to the cylinder flange 421 closest to the cylinder head 41.

[0049] Reference Figure 2 and Figure 4 The cylinder 42 has a fourth groove 422 on the end face away from the cylinder head 41. 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, and the inner diameter of the fourth groove 422 is greater than the inner diameter of the cylinder 42.

[0050] Reference Figure 2 , Figure 4 and Figure 7 The cylinder barrel 42, facing away from the cylinder head 41, is connected to the cylinder tail 43 by screws. The cylinder tail 43 is a circular tube. A fifth groove 433, an annular groove, is formed on the end of the cylinder tail 43 facing away from the cylinder barrel 42. The outer diameter of the fifth groove 433 is the same as the outer diameter of the cylinder tail 43, and its inner diameter is smaller than the outer diameter of the cylinder body 44 but larger than its inner diameter. A sixth groove 434, also an annular groove, is formed on the end of the cylinder tail 43 facing away from the cylinder barrel 42. The inner diameter of the sixth groove 434 is the same as the inner diameter of the cylinder tail 43, and its outer diameter is smaller than the inner diameter of the fifth groove 433. Eight threaded holes, evenly spaced along the circumference of the cylinder tail 43, are formed on the end face of the cylinder tail 43 facing away from the cylinder barrel 42. The annulus containing these eight threaded holes is located between the outer diameter of the sixth groove 434 and the inner diameter of the fifth groove 433.

[0051] Reference Figure 2 , Figure 4 and Figure 7A seventh groove 435 is formed on the end face of the cylinder tail 43 facing the cylinder barrel 42. The seventh groove 435 is an annular groove, and its inner diameter is the same as that of the cylinder tail 43. The outer diameter of the seventh groove 435 is equal to the inner diameter of the fourth groove 422. An eighth groove 436 is formed on the side of the seventh groove 435. The eighth groove 436 is an annular groove, and a static sealing ring is embedded in the eighth groove 436. A ninth groove 437 is formed on the bottom surface of the eighth groove 436. The ninth groove 437 is a fan-shaped groove, and its axis is coaxial with the axis of the eighth groove 436 and coincides with the axis of the cylinder tail 43. The outer diameter of the ninth groove 437 is smaller than that of the eighth groove 436, and its inner diameter is equal to that of the cylinder tail 43. The bottom surface of the eighth groove 436 has a tenth groove 438, which is an annular groove. The inner diameter of the tenth groove 438 is the same as the inner diameter of the cylinder tail 43, and the outer diameter of the tenth groove 438 is smaller than the outer diameter of the eighth groove 436. A detection groove 439 is formed on the inner side of the cylinder tail 43, located between the seventh groove 435 and the sixth groove 434. The detection groove 439 is an annular groove and communicates with the ninth groove 437. The inner diameter of the detection groove 439 is equal to the inner diameter of the cylinder tail 43, and 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 has eleven through holes arranged circumferentially around the cylinder tail 43, with the axis of the through holes parallel to the axis of the cylinder tail 43.

[0052] Reference Figure 2 , Figure 4 and Figure 7 A rear oil hole 431 is provided on the outer side of the cylinder tail 43. The rear oil hole 431 includes a threaded hole on the outer side of the cylinder tail 43, and a through hole communicating with the inner cavity of the ninth groove 437 is provided on the bottom surface of the threaded hole. A rear inspection hole 432 is provided on the outer side of the cylinder tail 43. The rear inspection hole 432 includes a threaded hole on the outer side of the cylinder tail 43, and a through hole communicating with the inner cavity of the cylinder tail 43 is provided on the bottom surface of the threaded hole. The rear inspection hole 432 and the rear oil hole 431 are spaced apart circumferentially along the cylinder head 41, and the axes of the rear inspection hole 432 and the rear oil hole 431 are along the radial direction of the cylinder tail 43.

[0053] Reference Figure 4 The rear oil hole 431 is used to connect to the hydraulic pipe connector, and the rear inspection hole 432 in this embodiment is threadedly connected to a pressure testing connector 45 that is in sealed communication with the inner cavity of the cylinder tail 43. A plug can also be connected to the rear inspection hole 432 to seal it.

[0054] Reference Figure 2 and Figure 4 The cylinder block 44 has a cylindrical tube structure. A relief groove 444 is provided on the end face of the cylinder block 44 facing the cylinder tail 43. The relief groove 444 is an annular groove, with its inner diameter equal to the inner diameter of the cylinder block 44, and its outer diameter equal to the inner diameter of the fifth groove 433 (see reference). Figure 7The cylinder body 44 has an external thread on the outer side of its end facing the cylinder tail 43. A cylinder flange 441 is threaded to this end of the cylinder body 44. The cylinder flange 441 is annular in structure and has 12 through holes spaced circumferentially along the axis of the cylinder body 44. Eleven screws pass through the cylinder flange 441, through the cylinder tail 43, and then threadedly connected to the cylinder barrel flange 421 near the cylinder tail 43, thus achieving a detachable connection between the cylinder body 44, cylinder tail 43, and cylinder barrel 42. An air vent 442 communicating with the inner cavity of the cylinder body 44 is provided on its side. The air vent is a threaded hole with its axis along the radial direction of the cylinder body 44. An air filter 443 is threaded to the side of the cylinder body 44 through the air vent 442. In this embodiment, a C-type air filter 443 is used.

[0055] Reference Figure 2 A cylinder tail lug 5 is welded to one end of the cylinder body 44 facing away from the cylinder tail 43. The cylinder tail lug 5 includes a disc with the same diameter as the outer diameter of the cylinder body 44. A ring is integrally provided on the end face of the disc facing the cylinder body 44. The outer diameter of the ring is the same as the inner diameter of the cylinder body 44. A square plate is integrally provided on the end face of the disc facing away from the cylinder body 44. A semi-circular disc is integrally provided on one end of the square plate facing away from the disc. A cylinder tail hole 51 is provided on the square plate and the semi-circular disc. The axis of the cylinder tail hole 51 is perpendicular to the axis of the cylinder body 44.

[0056] Reference Figure 2 Two intermittently spaced connecting grooves are provided inside the cylinder tail bore 51. The connecting grooves are annular grooves whose axes coincide with the axis of the cylinder tail bore 51. Each of the two connecting grooves is provided with a shaft elastic retaining ring 19, and a radial spherical bearing 18 is provided between the two shaft elastic retaining rings 19. A lubrication hole is provided on the side of the square plate. The lubrication hole is a threaded hole, and the port of the lubrication hole extending into the cylinder tail bore 51 is located between the two connecting grooves. A straight-through oil cup 17 is threadedly connected inside the lubrication hole.

[0057] Reference Figure 2 and Figure 5 The piston rod 1 includes a cylinder head lug 11. A front rod 12 is integrally provided at the end of the cylinder head lug 11 facing the cylinder head 41. A connector 13 coaxial with the front rod 12 is integrally provided at the end of the front rod 12 facing away from the cylinder head lug 11. A piston 14 coaxial with the connector 13 is detachably connected to the connector 13. A rear rod 15 coaxial with the piston 14 is integrally provided on the piston 14.

[0058] Reference Figure 2 The cylinder head lip 11 includes a semi-circular disc. A trapezoidal plate is integrally formed on the flat end of the semi-circular disc, and the lower base of the trapezoidal plate is connected to the semi-circular disc. A circular disc is integrally formed on the end of the trapezoidal plate facing away from the semi-circular disc. The axis of the circular disc is along the axis of the cylinder head 41, and the inner diameter of the circular 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 formed on the semi-circular disc.

[0059] Reference Figure 2 Two spaced connecting grooves are provided on the inner side of the cylinder head bore 111. The connecting grooves are annular grooves whose axes coincide with the axis of the cylinder head bore 111. Shaft elastic retaining rings 19 are provided in the connecting grooves respectively, and a radial spherical bearing 18 is provided between the two shaft elastic retaining rings 19. A lubrication hole is provided on the side of the square plate. The lubrication hole is a threaded hole. The port of the lubrication hole extending into the cylinder head bore 111 is located between the two connecting grooves. A straight-through oil cup 17 is threadedly connected to the lubrication hole.

[0060] Reference Figure 2 and Figure 5 The front rod 12 is a round rod integrally formed with the disc on the cylinder head lug 11, and the outer diameter of the round rod is equal to the inner diameter of the first ring 416. The connector 13 includes a transition rod integrally formed 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. The connector 13 includes a screw integrally formed on the end of the transition rod away from the front rod 12. The outer side of the screw is provided with external threads, and the outer diameter of the screw is smaller than that of the transition rod.

[0061] Reference Figure 2 and Figure 5 The piston 14 has a round cap structure, with its opening facing the front rod 12. The outer diameter of the piston 14 is equal to the inner diameter of the cylinder 42. A transition hole 144 is provided at the end of the piston 14 facing the front rod 12. The diameter of the transition hole 144 is the same as the diameter of the transition rod, allowing the transition rod to be inserted into the transition hole 144. An inner connecting hole 145 is provided on the bottom surface of the transition hole 144. The inner connecting hole 145 is a threaded hole, and the connector 13 is screwed into the inner connecting hole 145 via a screw to achieve a detachable connection between the connector 13 and the piston 14. A third outer groove 143 is provided at the end of the piston 14 facing the front rod 12. The third outer groove 143 is an annular groove, with its outer diameter being the same as the outer diameter of the piston 14. The inner diameter of the third outer groove 143 is larger than the diameter of the transition hole 144. A set screw hole is provided on the side of the third outer groove 143, communicating with the inner cavity of the inner connecting hole 145. Two set screw holes are spaced apart along the circumference of the piston 14. The set screw 16 is threaded into the set screw hole. After the connector 13 is threadedly connected to the piston 14, the set screw 16 is rotated so that it passes through the inner connecting hole 145 and contacts and presses against the side of the connector 13.

[0062] Reference Figure 2 and Figure 5The piston 14 has a first outer groove 141 on its side. The first outer groove 141 is an annular groove. The first outer groove 141 has two grooves spaced apart along the axis of the piston 14. The piston 14 has a second outer groove 142 on its side. 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 inner diameter of the first outer groove 141 but larger than the inner diameter of the first outer groove 141.

[0063] Reference Figure 2 and Figure 5 The rear rod 15 is a round rod with the same diameter as the front rod 12. A relief groove is provided at the connection between the rear rod 15 and the piston 14. The outer side of the rear rod 15 facing away from the piston 14 is chamfered, and the inner side is provided with a process hole.

[0064] Reference Figure 2 A dust cover 7 is fitted on the cylinder head ear ring 11. One end of the dust cover 7 is connected to the cylinder head ear ring 11, and the other end is connected to the cylinder head 41. The dust cover 7 can extend and retract along the axis of the cylinder head 41.

[0065] Reference Figure 2 , Figure 4 and Figure 5 The piston 14 is provided with a central sealing mechanism 6, which includes a support ring 61 embedded in two first outer grooves 141. The support ring 61 is a guide ring for the piston and is made of copper alloy. The support ring 61 supports the piston 14 and improves the stability of the piston 14 during sliding. The central sealing mechanism 6 also includes a Glyd ring 62 embedded in a second outer groove 142. The Glyd ring 62 is a shaft Glyd ring 62. The Glyd ring 62 includes an O-ring 621 that contacts the inner side of the second outer groove 142 and a polytetrafluoroethylene (PTFE) ring 622 located outside the O-ring 621. The side of the PTFE ring 622 contacts and presses against the inner side of the cylinder 42 to maintain the seal between the piston 14 and the cylinder 42.

[0066] Reference Figure 2 , Figure 4 and Figure 7 A rear sealing mechanism 3 is provided on the outer side of the rear rod 15. The rear sealing mechanism 3 includes a rear guide sleeve 32 sleeved on the outer side of the rear rod 15. The rear guide sleeve 32 is a ring made of aluminum bronze. The inner diameter of the rear guide sleeve 32 is equal to the diameter of the rear rod 15, and 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 and abuts against the piston 14. A rear step groove 321 is opened on the outer side of the end of the rear guide sleeve 32 facing the piston 14. 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 4and Figure 7 The rear sealing mechanism 3 includes a rear sealing cap 31 bolted to the end of the cylinder tail 43 facing away from the cylinder barrel 42. The rear sealing cap 31 includes an outer ring, the inner diameter of which is the same as the diameter of the rear rod 15, and the outer diameter of which is the same as the outer diameter of the relief groove 444. The outer ring has through holes, and eight through holes are evenly distributed around the circumference of the outer ring. Eight screws are threaded through the through holes and threaded into the threaded holes on the cylinder tail 43, and elastic washers are fitted on the screws. An inner ring is integrally formed on the outer ring, the inner diameter of which 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 and Figure 7 The rear sealing mechanism 3 includes a rear U-shaped rod sealing ring 33 sleeved on the outside of the rear rod 15 and located between the rear sealing cover 31 and the rear guide sleeve 32. The rear U-shaped rod sealing ring 33 is a one-way sealing ring. The rear U-shaped rod sealing ring 33 is pressed against the rear guide sleeve 32 by the action of the rear sealing cover 31. The rear U-shaped rod sealing ring 33 restricts the liquid in the cylinder 42 from entering the cylinder body 44.

[0069] Reference Figure 2 , Figure 3 and Figure 6 A front sealing mechanism 2 is provided on the outer side of the front rod 12. The front sealing mechanism 2 includes a front guide sleeve 22 sleeved on the outer side of the front rod 12. The front guide sleeve 22 is a ring made of aluminum bronze. The inner diameter of the front guide sleeve 22 is equal to the diameter of the front rod 12, and 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. The end of the front guide sleeve 22 facing away from the cylinder head lug 11 abuts against the first ring 416. A front step groove 221 is provided on the inner side of the end of the front guide sleeve 22 facing the piston 14. The inner diameter of the front step groove 221 is equal to the diameter of the front rod 12. A front U-shaped rod sealing ring 24 sleeved on the outer side of the front rod 12 is provided in the front step groove 221. The front U-shaped rod sealing ring 24 has the same specifications as the rear U-shaped rod sealing ring 33. The outer side 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 achieves a seal between the front guide sleeve 22 and the inner side of the cylinder head 41.

[0070] Reference Figure 2 , Figure 3 and Figure 6The front sealing mechanism 2 includes a front sealing cap 21 bolted to the end of the cylinder head 41 facing away from the cylinder barrel 42. The front sealing cap 21 includes a large ring with an inner diameter the same as the diameter of the front rod 12 and an outer diameter the same as the inner diameter of the first groove 413. Eight through holes are evenly distributed around the circumference of the large ring. Eight screws, threaded through the through holes and connected to threaded holes on the cylinder head 41, are threaded onto the large ring. Elastic washers are fitted onto the screws. A small ring, coaxial with the cylinder head 41, is integrally formed on the outer ring facing the cylinder head 41. The outer diameter of the small ring is equal to the inner diameter of the cylinder head 41. After the front sealing cap 21 applies pressure to the front U-shaped rod sealing ring 24, the front U-shaped rod sealing ring 24 restricts the liquid in the cylinder barrel 42 from flowing out through the gap between the front sealing cap 21 and the front rod 12.

[0071] Reference Figure 2 A small inner ring groove is formed on the inner side of the end face of the front sealing gland 21 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. A large inner ring groove is formed on the bottom surface of the small inner ring groove. The inner diameter of the large inner ring groove is equal to the inner diameter of the front sealing gland 21. The outer diameter of the large inner ring groove is larger than the outer diameter of the small inner ring groove but smaller than the outer diameter of the small ring. A double-lip sealing ring 23 is embedded in the end face of the front sealing gland 21 facing away from the cylinder head 41, located in the small inner ring groove and the large inner ring groove.

[0072] The working process of the above embodiments is as follows:

[0073] After connecting the two hydraulic pipe fittings to the front oil port and the rear oil port respectively, when high-pressure hydraulic oil enters the rear oil port, the high-pressure oil in the cylinder flows out through the front oil port. The hydraulic oil pushes the piston to slide along the inner side of the cylinder. The piston drives the rear rod to slide along the inner side of the rear guide sleeve. The piston pushes the front rod, which is connected to the piston through the connector, to move. The front rod moves along the side of the front guide sleeve. The front rod drives the cylinder head lug to move away from the cylinder tail lug. When high-pressure oil enters the front oil port, the high-pressure oil in the cylinder flows out through the rear oil port. The hydraulic oil pushes the cylinder head lug to move towards the cylinder tail lug, thereby realizing the reciprocating movement between the cylinder head lug and the cylinder tail lug on the hydraulic cylinder.

[0074] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A heavy duty hydraulic cylinder characterized by: Including the shell (4), the piston rod (1) is arranged in the shell (4) and slides along the inner cavity of the shell (4); The shell (4) includes a cylinder head (41), a cylinder barrel (42) detachably connected to the cylinder head (41), a cylinder tail (43) detachably connected to the cylinder barrel (42), and a cylinder body (44) detachably connected to the cylinder tail (43); the inner cavity center lines of the cylinder head (41), the cylinder barrel (42), the cylinder tail (43) and the cylinder body (44) coincide, and the cylinder head (41), the cylinder barrel (42), the cylinder tail (43) and the cylinder body (44) are arranged in sequence; The cylinder tail ear ring (5) is fixedly arranged at one end of the cylinder body (44) away from the cylinder tail (43); The piston rod (1) includes a cylinder head ear ring (11) and a front rod (12) integrally arranged with the cylinder head ear ring (11), a piston (14) detachably connected to the front rod (12), the piston (14) sliding along the inner wall of the cylinder barrel (42) along the center line direction of the piston (14), and a rear rod (15) integrally arranged on the piston (14); The connecting head (13) includes a transition rod and a screw rod integrally arranged, and the outer thread is formed on the side surface of the screw rod, and the outer diameter of the screw rod is smaller than the outer diameter of the transition rod; The transition hole (144) is formed at one end of the piston (14) away from the rear rod (15), the diameter of the transition hole (144) is the same as the diameter of the transition rod, the transition rod can be inserted into the transition hole (144), and the inner connecting hole (145) is formed on the bottom surface of the transition hole (144), and the inner connecting hole (145) is threadedly connected with the screw rod; The front sealing mechanism (2) is arranged on the inner side of the cylinder head (41), the middle sealing mechanism (6) is arranged on the inner side of the cylinder barrel (42), and the rear sealing mechanism (3) is arranged on the inner side of the cylinder tail (43); The front oil hole (411) is formed on the side surface of the cylinder head (41) and communicates with the inner cavity of the cylinder head (41), and the front oil hole (411) communicates with the inner cavity of the cylinder barrel (42); the rear oil hole (431) is formed on the side surface of the cylinder tail (43) and communicates with the inner cavity of the cylinder tail (43), and the rear oil hole (431) communicates with the inner cavity of the cylinder barrel (42).

2. The heavy duty hydraulic cylinder of claim 1, wherein: The cylinder barrel flanges (421) are fixedly connected to the two ends of the cylinder barrel (42) along the axial direction of the cylinder barrel (42); The screw is arranged on the cylinder head (41), the cylinder head (41) and the cylinder barrel flange (421) close to the cylinder head (41) are tightly connected by the screw, and the detachable connection between the cylinder barrel (42) and the cylinder head (41) is realized; The cylinder body flange (441) is fixedly connected to one end of the cylinder body (44) facing the cylinder head (41), the screw is arranged on the cylinder body flange (441), the cylinder body flange (441), the cylinder tail (43) and the cylinder barrel flange (421) away from the cylinder head (41) are tightly connected by the screw, and the detachable connection between the cylinder barrel (42), the cylinder tail (43) and the cylinder body (44) is realized.

3. The heavy duty hydraulic cylinder of claim 1, wherein: The front rod (12) is sleeved with a front guide sleeve (22) in the inner cavity of the cylinder head (41), and the rear rod (15) is sleeved with a rear guide sleeve (32) in the inner cavity of the cylinder tail (43); The first outer groove (141) is arranged on the side surface of the piston (14), and the support ring (61) is arranged in the first outer groove (141) and in contact with the side surface of the inner cavity of the cylinder barrel (42); when the piston (14) moves along the axis direction of the cylinder barrel (42), the support ring (61) slides along the inner side surface of the cylinder barrel (42).

4. The heavy duty hydraulic cylinder of claim 3, wherein: The front guide sleeve (22) is provided with a front step groove (221) in the inner side of one end of the piston (14), the front sealing mechanism (2) comprises a front U-shaped rod sealing ring (24) arranged in the front step groove (221), and the cylinder head (41) is connected in a pressing manner at one end away from the cylinder barrel (42) and is provided with a front sealing gland (21) in abutting pressure with the front U-shaped rod sealing ring (24). The inner side surface of the front sealing gland (21) is provided with an annular groove, and the annular groove is embedded with a sealing ring. The rear sealing mechanism (3) comprises a rear U-shaped rod sealing ring (33) sleeved on the outer side of the rear rod (15), and the cylinder tail (43) is connected in a pressing manner at one end away from the cylinder barrel (42) and is provided with a rear sealing gland (31) in abutting pressure with the rear U-shaped rod sealing ring (33).

5. The heavy duty hydraulic cylinder of claim 3, wherein: The first outer groove (141) is arranged on the side surface of the piston (14) in a spaced manner, and the second outer groove (142) is arranged on the side surface of the piston (14) between the two first outer grooves (141); the middle sealing mechanism (6) comprises a Glay ring (62) embedded in the second outer groove (142).

6. The heavy duty hydraulic cylinder of claim 1, wherein: The side surface of the piston (14) is provided with a tight fixing screw hole in communication with the threaded hole, and the tight fixing screw (16) is threadedly connected in the tight fixing screw hole and in contact with the side surface of the connecting head (13) in a pressing manner.

7. The heavy duty hydraulic cylinder of claim 1, wherein: The side surface of the cylinder head (41) is provided with a front detection hole (412) in communication with the inner cavity of the cylinder head (41); and the side surface of the cylinder tail (43) is provided with a rear detection hole (432) in communication with the inner cavity thereof.

8. The heavy duty hydraulic cylinder of claim 1, wherein: The outer side surface of the cylinder body (44) is provided with an air breathing hole (442) in communication with the inner cavity of the cylinder body (44).

9. The heavy duty hydraulic cylinder of claim 1, wherein: The cylinder tail hole (51) is arranged in the cylinder tail ear ring (5) and is provided with a bearing; the cylinder tail hole (51) is embedded with a retaining ring for limiting the ball bearing in the cylinder tail hole (51), and the retaining ring is in contact with the end surface of the bearing; The cylinder head hole (111) is arranged in the cylinder head ear ring (11) and is provided with a bearing; the cylinder head hole (111) is embedded with a retaining ring for limiting the bearing in the cylinder head hole (111), and the retaining ring is in contact with the end surface of the bearing.

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