Plunger type oil cylinder for large planogrinder workbench

Abstract

The utility model provides a plunger type oil cylinder for a working table of a large planogrinder, which is provided with an oil cylinder outer barrel body, the oil cylinder outer barrel body comprises a first outer barrel section, a second outer barrel section and a third outer barrel section, and the first outer barrel section, the second outer barrel section and the third outer barrel section are axially and fixedly connected in sequence. A piston rod sliding cavity is formed in the first outer cylinder section, the second outer cylinder section and the third outer cylinder section, and a piston rod is arranged in the piston rod sliding cavity and can slide front and back along the piston rod sliding cavity. The hydraulic oil cylinder solves the problem that an existing hydraulic oil cylinder cannot be applied to a workbench of a super-heavy and super-long planogrinder due to the limitation of the stroke distance and the output pressure of the existing hydraulic oil cylinder. The workbench moving device can be widely applied to moving of workbenches of large planogrinders.

Description

Technical Field

[0001] The utility model relates to a gantry grinder, in particular to a plunger type oil cylinder for a working table of a large gantry grinder. Background Art

[0002] A surface grinder is a machine tool specially used for high-precision surface grinding. It has a wide range of uses and can be used to grind various hard materials such as metal, ceramics, glass, etc. Its main structure is composed of a bed, a beam, a column, a worktable, a grinding wheel spindle and a feed shaft.

[0003] Among them, the movement of the workbench is driven by a hydraulic cylinder to realize movement in the X-axis direction. However, due to the limitations of the stroke distance and output pressure of the existing hydraulic cylinder, it cannot be applied to super-heavy and super-long gantry grinders. The moving speed of the workbench of such gantry grinders usually needs to reach a minimum standard of 25 meters / minute. Therefore, there is an urgent need for a driving cylinder that can be applied to super-heavy and super-long gantry grinders. The driving cylinder should have the characteristics of long driving stroke, high driving pressure, good stability, good sealing and long service life. Utility Model Content

[0004] In view of the above technical problems, the utility model provides a plunger type oil cylinder for a large gantry grinder worktable. The plunger type oil cylinder for a large gantry grinder worktable can be applied to super-heavy and super-long gantry grinders, can achieve a long-distance and high-speed driving stroke, has a large driving pressure, and can smoothly drive the worktable to move. The whole has good stability and sealing performance and a long service life.

[0005] To this end, the technical solution of the utility model is a plunger-type oil cylinder for a large gantry grinder worktable, provided with an oil cylinder outer cylinder body, the oil cylinder outer cylinder body comprising a first outer cylinder section, a second outer cylinder section, and a third outer cylinder section, the outer surface of the first outer cylinder section is fixedly provided with a first outer cylinder section front end fixing flange near the front end, the outer surface of the first outer cylinder section is fixedly provided with a first outer cylinder section rear end fixing flange near the rear end, the outer surface of the second outer cylinder section is fixedly provided with a second outer cylinder section front end fixing flange near the front end, the outer surface of the second outer cylinder section is fixedly provided with a second outer cylinder section rear end fixing flange near the rear end, the outer surface of the third outer cylinder section is fixedly provided with a third outer cylinder section front end fixing flange near the front end, and the outer surface of the third outer cylinder section is fixedly provided with a third outer cylinder section rear end fixing flange near the rear end;

[0006] An external connecting sleeve is provided on the outer circumference of the first outer cylinder section and the second outer cylinder section at a position between the front end fixing flange of the first outer cylinder section and the rear end fixing flange of the second outer cylinder section, threaded holes are provided on the axial end faces of the external connecting sleeve, axial through holes are provided on the front end fixing flange of the first outer cylinder section and the rear end fixing flange of the second outer cylinder section, the front end fixing flange of the first outer cylinder section and the rear end fixing flange of the second outer cylinder section are axially threadedly connected through locking screws respectively passing through the through holes on the front end fixing flange of the first outer cylinder section, the rear end fixing flange of the second outer cylinder section and the threaded hole on the external connecting sleeve, after the front end fixing flange of the first outer cylinder section and the rear end fixing flange of the second outer cylinder section are axially connected to the external connecting sleeve respectively, the front end part of the first outer cylinder section and the rear end part of the second outer cylinder section are axially fixed and locked;

[0007] An oil sealing ring is provided between the rear end position of the inner surface of the external connection sleeve and the outer surface of the first outer cylinder section, and the rear end position of the inner surface of the external connection sleeve and the outer surface of the first outer cylinder section are sealed and fixedly connected by the oil sealing ring; an oil sealing ring is provided between the front end position of the inner surface of the external connection sleeve and the outer surface of the second outer cylinder section, and the front end position of the inner surface of the external connection sleeve and the outer surface of the second outer cylinder section are sealed and fixedly connected by the oil sealing ring;

[0008] An external connecting sleeve is provided on the outer circumference of the second outer cylinder section and the third outer cylinder section at a position between the front end fixing flange of the second outer cylinder section and the rear end fixing flange of the third outer cylinder section, threaded holes are provided on the axial end faces of the external connecting sleeve, axial through holes are provided on the front end fixing flange of the second outer cylinder section and the rear end fixing flange of the third outer cylinder section, the front end fixing flange of the second outer cylinder section and the rear end fixing flange of the third outer cylinder section are axially threadedly connected through the through holes on the front end fixing flange of the second outer cylinder section and the rear end fixing flange of the third outer cylinder section and the threaded holes on the external connecting sleeve respectively through locking screws, after the front end fixing flange of the second outer cylinder section and the rear end fixing flange of the third outer cylinder section are axially connected to the external connecting sleeve respectively, the front end part of the second outer cylinder section and the rear end part of the third outer cylinder section are axially fixed and locked;

[0009] An oil sealing ring is provided between the rear end position of the inner surface of the external connection sleeve and the outer surface of the second outer cylinder segment, and the rear end position of the inner surface of the external connection sleeve and the outer surface of the second outer cylinder segment are sealed and fixedly connected by the oil sealing ring; an oil sealing ring is provided between the front end position of the inner surface of the external connection sleeve and the outer surface of the third outer cylinder segment, and the front end position of the inner surface of the external connection sleeve and the outer surface of the third outer cylinder segment are sealed and fixedly connected by the oil sealing ring;

[0010] After the first outer cylinder section, the second outer cylinder section and the third outer cylinder section are axially fixedly connected, a piston rod sliding cavity is formed inside the first outer cylinder section, the second outer cylinder section and the third outer cylinder section, a piston rod is arranged in the piston rod sliding cavity, the piston rod can slide back and forth along the piston rod sliding cavity, a piston rod middle connecting section is arranged in the middle position of the piston rod, a piston rod front end fixing section is fixedly arranged at the front end of the piston rod middle connecting section, a piston rod rear end fixing section is fixedly arranged at the rear end of the piston rod middle connecting section, and a piston rod positioning column accommodating groove is arranged in the middle position of the axial rear end of the piston rod rear end fixing section;

[0011] An oil inlet fixing seat is provided at the rear end of the first outer cylinder section, a first positioning groove is provided along the circumferential direction at the front end of the oil inlet fixing seat near the outer circumference, an axial threaded hole is provided at the outer end surface of the first positioning groove at the front end of the oil inlet fixing seat, an axial through hole is provided on the fixing flange at the rear end of the first outer cylinder section, the fixing flange at the rear end of the first outer cylinder section is axially threadedly connected through the through hole on the fixing flange at the rear end of the first outer cylinder section and the threaded hole on the oil inlet fixing seat by a locking screw, so that the oil inlet fixing seat and the rear end surface of the first outer cylinder section are axially fixed and locked;

[0012] An oil sealing ring is fixedly arranged between the axial groove surface of the first positioning groove and the rear end surface of the first outer cylinder section, and the axial groove surface of the first positioning groove and the rear end surface of the first outer cylinder section are sealed and fixedly connected through the oil sealing ring; an oil sealing ring is fixedly arranged between the radial groove surface of the first positioning groove and the outer surface of the first outer cylinder section, and the radial groove surface of the first positioning groove and the outer surface of the first outer cylinder section are sealed and fixedly connected through the oil sealing ring;

[0013] A piston rod positioning column is provided at the radial middle position of the oil inlet fixing seat, the front end of which is located inside the first outer cylinder section, an axially penetrating oil flow through hole is provided between the piston rod positioning column and the first positioning groove, and the oil flow through hole and the piston rod sliding cavity are communicated with each other;

[0014] The rear end face of the oil inlet fixing seat is located at the outer position of the oil flow through hole, and an oil inlet sleeve is provided. An oil sealing ring is fixedly provided between the oil inlet sleeve and the oil inlet fixing seat. The rear end face of the oil inlet fixing seat is located at the outer position of the piston rod sliding cavity and is axially sealed and fixedly connected with the front end face of the oil inlet sleeve through the oil sealing ring. The rear end face of the oil inlet sleeve is provided with a sleeve end cover. An oil sealing ring is fixedly provided between the sleeve end cover and the rear end face of the oil inlet sleeve. The sleeve end cover and the rear end face of the oil inlet sleeve are axially sealed and fixedly connected through the oil sealing ring. An oil inner cavity is provided inside the oil inlet sleeve, and the oil inner cavity, the oil flow through hole and the piston rod sliding cavity are connected with each other.

[0015] An exhaust channel is provided on the oil inlet sleeve, the inner channel opening of the exhaust channel and the oil inner cavity are communicated with each other, the outer channel opening of the exhaust channel is fixedly provided with a second exhaust channel hole and a first exhaust channel hole, the outer channel opening of the exhaust channel, the second exhaust channel hole and the first exhaust channel hole are communicated with each other, the second exhaust channel hole and the first exhaust channel hole respectively penetrate to the outer surface of the oil inlet sleeve, a sealing ball is provided at the outer channel opening of the exhaust channel, a threaded top screw is provided in the first exhaust channel hole, the threaded top screw is tightened inwardly, and the sealing ball is pressed to seal the outer channel opening of the exhaust channel;

[0016] The oil inlet sleeve is provided with a sleeve oil inlet hole, and the sleeve oil inlet hole and the oil inner cavity are communicated with each other;

[0017] A support flange is provided at the front end of the third outer cylinder section, a second positioning groove is provided on the outer surface of the support flange near the rear end, a third positioning groove is provided on the outer surface of the support flange near the front end, and a fourth positioning groove is provided on the inner surface of the support flange near the front end;

[0018] An external connecting sleeve is provided on the outer surface of the third outer cylinder segment and the outer surface of the supporting flange at a position between the front end fixing flange of the third outer cylinder segment and the axial groove surface of the second positioning groove, and an axial threaded hole is respectively provided on the front end face and the rear end face of the external connecting sleeve, and an axial through hole is provided at a position between the axial groove surface of the second positioning groove and the axial groove surface of the third positioning groove, and the supporting flange is threadedly locked by passing a locking screw through the through hole and the threaded hole on the front end face of the supporting flange, so that the supporting flange and the external connecting sleeve are axially fixed and locked, and an axial through hole is provided on the front end fixing flange of the third outer cylinder segment, and the front end fixing flange of the third outer cylinder segment is threadedly locked by passing a locking screw through the through hole and the threaded hole on the rear end face of the supporting flange, so that the third outer cylinder segment and the supporting flange are axially fixed and locked;

[0019] A locking sealing nut is provided at the rear end of the supporting flange, and a fifth positioning groove is provided inside the middle position of the locking sealing nut, and a combined sealing ring fixing sleeve is fixedly provided on the axial groove surface of the fifth positioning groove and the axial groove surface of the fourth positioning groove, respectively, and a combined sealing ring is fixedly provided between the two combined sealing ring fixing sleeves, and an internal threaded tooth is provided on the inner surface at the rear end position of the locking sealing nut, and an external threaded tooth is provided on the outer surface of the radial groove surface of the third positioning groove, and the internal threaded tooth and the external threaded tooth are thread-locked with each other to axially fix and lock the supporting flange and the locking sealing nut, and at the same time of axially fixing and locking the supporting flange and the locking sealing nut, the fifth positioning groove, the combined sealing ring fixing sleeve and the combined sealing ring are axially locked with each other, the inner surface of the combined sealing ring exceeds the inner surface position of the combined sealing ring fixing sleeve, the combined sealing ring and the outer surface of the piston rod are slidingly sealed and connected, and the inner surface of the front end of the locking sealing nut and the outer surface of the piston rod are slidingly fixedly connected;

[0020] A sixth positioning groove is provided at the front end position of the outer surface of the front end fixing section of the piston rod, and a machine tool worktable fixing seat is fixed on the radial groove surface of the sixth positioning groove. The machine tool worktable fixing seat and the axial groove surface of the sixth positioning groove are axially fixedly connected, and the front end of the machine tool worktable fixing seat is located on the radial groove surface of the sixth positioning groove and is connected to a locking nut, and external thread teeth are provided on the radial groove surface of the sixth positioning groove. The locking nut and the radial groove surface of the sixth positioning groove are threadedly locked, so that the locking nut, the machine tool worktable fixing seat and the axial groove surface of the sixth positioning groove are axially locked and fixed to each other.

[0021] Preferably, a self-lubricating bearing is fixedly provided between the front end surface of the first outer cylinder section and the rear end surface of the second outer cylinder section, the self-lubricating bearing is fixedly connected to the inner surface of the external connecting sleeve, the inner surface of the self-lubricating bearing exceeds the inner surface position of the first outer cylinder section and the second outer cylinder section, and is slidably fixedly connected to the outer surface of the piston rod;

[0022] A self-lubricating bearing is fixedly arranged between the front end surface of the second outer cylinder segment and the rear end surface of the third outer cylinder segment, the self-lubricating bearing is fixedly connected to the inner surface of the external connecting sleeve, the inner surface of the self-lubricating bearing exceeds the inner surface position of the second outer cylinder segment and the third outer cylinder segment, and is slidably fixedly connected to the outer surface of the piston rod;

[0023] A self-lubricating bearing is fixedly provided between the front end face of the third outer cylinder section and the rear end face of the support flange. The self-lubricating bearing is fixedly connected to the inner surface of the external connecting sleeve. The inner surface of the self-lubricating bearing exceeds the inner surface position of the third outer cylinder section and the support flange, and is slidably fixedly connected to the outer surface of the piston rod.

[0024] Preferably, a spherical washer is fixed on the axial groove surface of the sixth positioning groove, a conical washer is fixed on the front end of the spherical washer, the front end of the conical washer is fixedly connected to the rear end of the machine tool worktable fixing seat, the front end of the machine tool worktable fixing seat is fixed with a conical washer, the front end of the conical washer is fixed with a spherical washer, the front end of the spherical washer is fixed with a locking nut, the locking nut and the radial groove surface of the sixth positioning groove are threadedly locked, and the locking nut, spherical washer, conical washer, machine tool worktable fixing seat and the axial groove surface of the sixth positioning groove are axially locked and fixed to each other.

[0025] Preferably, a dustproof sealing ring is provided between the inner surface of the front end of the locking sealing nut and the outer surface of the piston rod, and the inner surface of the front end of the locking sealing nut and the outer surface of the piston rod are slidingly sealed and connected via the dustproof sealing ring.

[0026] Preferably, the sleeve has multiple oil inlet holes.

[0027] Preferably, there are multiple locking nuts.

[0028] Preferably, a fixed support seat is fixedly provided on the outer surface of the first outer cylinder segment, a fixed support seat is fixedly provided on the outer surface of the second outer cylinder segment, a fixed support seat is fixedly provided on the outer surface of the third outer cylinder segment, and a fixed support seat is fixedly provided on the outer surface of the external connecting sleeve at the front end of the third outer cylinder segment.

[0029] The beneficial effects of the utility model are:

[0030] 1. The plunger type oil cylinder, the cylinder outer cylinder body and the piston rod are all of multi-segment assembly structure, which can be assembled in multiple sections according to the actual required moving length of the grinding machine worktable, so as to meet the large stroke requirements of the grinding machine worktable.

[0031] 2. By arranging multiple sleeve oil inlet holes on the oil inlet sleeve, hydraulic oil can be input into the cylinder through multiple sleeve oil inlet holes at the same time, ensuring that the oil pressure inside the cylinder is large enough, further increasing the sliding speed of the piston rod, and fully meeting the needs of high-speed movement of the worktable on the large gantry grinder.

[0032] 3. By arranging a self-lubricating bearing between the piston rod and the external connecting sleeve, when the piston rod moves, the outer surface of the piston rod and the inner surface of the self-lubricating bearing rub against each other, and the self-lubricating bearing lubricates the outer surface of the piston rod, greatly improving the smoothness and stability of the piston rod when sliding for a long time, extending the service life of the entire cylinder, and reducing the noise generated when the piston rod slides. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a three-dimensional diagram of the utility model;

[0034] Figure 2 It is another stereogram of the utility model;

[0035] Figure 3 It is the front view of the utility model;

[0036] Figure 4 This utility model Figure 3 Middle AA section view;

[0037] Figure 5 This utility model Figure 1 Enlarged view of point G in the middle;

[0038] Figure 6 This utility model Figure 2 Enlarged view of point B in the middle;

[0039] Figure 7 This utility model Figure 4 Enlarged view of point C in the middle;

[0040] Figure 8 This utility model Figure 4 Enlarged view of point D in the middle;

[0041] Fig. 9 This utility model Figure 4 Enlarged view of point E in the middle;

[0042] Fig.10 This utility model Figure 4 Enlarged view of point F in the middle;

[0043] Fig.11 This utility model Figure 3 Middle HH section view;

[0044] Fig.12 This utility model Figure 7 Enlarged view of J in the middle;

[0045] Fig.13 This is the front view of the oil inlet fixing seat of the utility model;

[0046] Fig.14 This utility model Fig.13 Middle LL section view;

[0047] Fig.15 This is the front view of the support flange of the utility model;

[0048] Fig.16 This utility model Fig.15 Middle KK section view;

[0049] Fig.17 This is the front view of the locking sealing nut of the utility model;

[0050] Fig.18 This utility model Fig.17 Middle MM section view;

[0051] Fig.19 It is a front view of the fixed section at the front end of the piston rod of the utility model.

[0052] Explanation of symbols in the figure:

[0053] 1. Oil inlet sleeve; 101. Second exhaust channel hole; 102. First exhaust channel hole; 103. Sleeve oil inlet hole; 104. Exhaust channel; 105. Oil inner cavity; 2. Sleeve end cover; 3. Fixed support seat; 4. Cylinder outer body; 401. First outer cylinder section; 40101. Front end fixing flange of first outer cylinder section; 40102. Rear end fixing flange of first outer cylinder section; 402. Second outer cylinder section; 40201. Front end fixing flange of second outer cylinder section; 40202. Rear end fixing flange of second outer cylinder section; 403. Third outer cylinder section; 40301. Front end fixing flange of third outer cylinder section; 40302. Rear end fixing flange of third outer cylinder section; 5. External connecting sleeve; 6. Through hole; 7. Piston rod; 701. Front end fixing section of piston rod; 70101. Sixth positioning groove; 702. Rear end fixing flange of piston rod Fixed section; 70201. Piston rod positioning column accommodating groove; 703. Piston rod middle connecting section; 8. Machine tool worktable fixing seat; 9. Locking nut; 10. Locking sealing nut; 1001. Fifth positioning groove; 1002. Internal threaded teeth; 11. Spherical washer; 12. Conical washer; 13. Oil sealing ring; 14. Oil inlet fixing seat; 1401. Oil flow through hole; 1402. Piston rod positioning column; 1403. First positioning groove; 15. Support flange; 1501. Second positioning groove; 1502. Third positioning groove; 1503. Fourth positioning groove; 1504. External threaded teeth; 16. Combined sealing ring; 17. Threaded hole; 18. Dustproof sealing pad; 19. Combined sealing ring fixing sleeve; 20. Sealing ball; 21. Self-lubricating bearing; 22. Threaded top screw; 23. Piston rod sliding chamber. DETAILED DESCRIPTION

[0054] The utility model is further described below in conjunction with embodiments.

[0055] pass Figure 1-Figure 19 It can be seen that the plunger-type oil cylinder for the worktable of the large gantry grinder is provided with an oil cylinder outer cylinder body 4, and the oil cylinder outer cylinder body 4 includes a first outer cylinder section 401, a second outer cylinder section 402, and a third outer cylinder section 403. The outer surface of the first outer cylinder section 401 is fixedly provided with a first outer cylinder section front end fixing flange 40101 near the front end, the outer surface of the first outer cylinder section 401 is fixedly provided with a first outer cylinder section rear end fixing flange 40102 near the rear end, the outer surface of the second outer cylinder section 402 is fixedly provided with a second outer cylinder section front end fixing flange 40201 near the front end, the outer surface of the second outer cylinder section 402 is fixedly provided with a second outer cylinder section rear end fixing flange 40202 near the rear end, the outer surface of the third outer cylinder section 403 is fixedly provided with a third outer cylinder section front end fixing flange 40301 near the front end, and the outer surface of the third outer cylinder section 403 is fixedly provided with a third outer cylinder section rear end fixing flange 40302 near the rear end.

[0056] An external connecting sleeve 5 is provided on the outer circumference of the first outer cylinder section 401 and the second outer cylinder section 402, and a position between the front end fixing flange 40101 of the first outer cylinder section and the rear end fixing flange 40202 of the second outer cylinder section is provided. The axial end faces of the external connecting sleeve 5 are provided with threaded holes 17 on both sides. Axial through holes 6 are provided on the front end fixing flange 40101 of the first outer cylinder section and the rear end fixing flange 40202 of the second outer cylinder section. The front end fixing flange 40101 of the first outer cylinder section and the rear end fixing flange 40202 of the second outer cylinder section are axially threadedly connected through the through holes 6 on the front end fixing flange 40101 of the first outer cylinder section and the rear end fixing flange 40202 of the second outer cylinder section and the threaded hole 17 on the external connecting sleeve 5 by locking screws respectively. After the front end fixing flange 40101 of the first outer cylinder section and the rear end fixing flange 40202 of the second outer cylinder section are axially connected to the external connecting sleeve 5 respectively, the front end part of the first outer cylinder section 401 and the rear end part of the second outer cylinder section 402 are axially fixed and locked.

[0057] An oil sealing ring 13 is provided between the rear end position of the inner surface of the external connecting sleeve 5 and the outer surface of the first outer cylinder section 401, and the rear end position of the inner surface of the external connecting sleeve 5 and the outer surface of the first outer cylinder section 401 are sealed and fixedly connected through the oil sealing ring 13. An oil sealing ring 13 is provided between the front end position of the inner surface of the external connecting sleeve 5 and the outer surface of the second outer cylinder section 402, and the front end position of the inner surface of the external connecting sleeve 5 and the outer surface of the second outer cylinder section 402 are sealed and fixedly connected through the oil sealing ring 13. The oil sealing ring 13 can prevent the lubricating oil in the piston rod sliding cavity 23 from leaking outward along the external connecting sleeve 5 and the first outer cylinder section 401 and the second outer cylinder section 402.

[0058] An external connecting sleeve 5 is provided on the outer circumference of the second outer cylinder section 402 and the third outer cylinder section 403 between the front end fixing flange 40201 of the second outer cylinder section and the rear end fixing flange 40302 of the third outer cylinder section. Threaded holes 17 are provided on the axial end faces of the external connecting sleeve 5 on both sides. Axial through holes 6 are provided on the front end fixing flange 40201 of the second outer cylinder section and the rear end fixing flange 40302 of the third outer cylinder section. The front end fixing flange 40201 of the second outer cylinder section and the rear end fixing flange 40302 of the third outer cylinder section are axially threadedly connected through the through holes 6 on the front end fixing flange 40201 of the second outer cylinder section and the rear end fixing flange 40302 of the third outer cylinder section respectively through locking screws and the threaded holes 17 on the external connecting sleeve 5. After the front end fixing flange 40201 of the second outer cylinder section and the rear end fixing flange 40302 of the third outer cylinder section are axially connected to the external connecting sleeve 5 respectively, the front end part of the second outer cylinder section 402 and the rear end part of the third outer cylinder section 403 are axially fixed and locked.

[0059] An oil sealing ring 13 is provided between the rear end position of the inner surface of the external connecting sleeve 5 and the outer surface of the second outer cylinder section 402, and the rear end position of the inner surface of the external connecting sleeve 5 and the outer surface of the second outer cylinder section 402 are sealed and fixedly connected by the oil sealing ring 13. An oil sealing ring 13 is provided between the front end position of the inner surface of the external connecting sleeve 5 and the outer surface of the third outer cylinder section 403, and the front end position of the inner surface of the external connecting sleeve 5 and the outer surface of the third outer cylinder section 403 are sealed and fixedly connected by the oil sealing ring 13. The oil sealing ring 13 can prevent the lubricating oil in the piston rod sliding cavity 23 from leaking outward along the external connecting sleeve 5 and the second outer cylinder section 402 and the third outer cylinder section 403.

[0060] After the first outer cylinder section 401, the second outer cylinder section 402, and the third outer cylinder section 403 are axially fixedly connected, a piston rod sliding cavity 23 is formed inside the first outer cylinder section 401, the second outer cylinder section 402, and the third outer cylinder section 403. The piston rod 7 is arranged in the piston rod sliding cavity 23, and the piston rod 7 can slide back and forth along the piston rod sliding cavity 23.

[0061] A piston rod middle connecting section 703 is provided in the middle position of the piston rod 7, a piston rod front end fixing section 701 is fixedly provided at the front end of the piston rod middle connecting section 703, a piston rod rear end fixing section 702 is fixedly provided at the rear end of the piston rod middle connecting section 703, and a piston rod positioning column accommodating groove 70201 is provided in the middle position of the axial rear end of the piston rod rear end fixing section 702.

[0062] An oil inlet fixing seat 14 is provided at the rear end of the first outer cylinder section 401, and a first positioning groove 1403 arranged along the circumferential direction is provided at the front end of the oil inlet fixing seat 14 near the outer circumference, and an axial threaded hole 17 is provided on the outer end face of the first positioning groove 1403 at the front end of the oil inlet fixing seat 14, and an axial through hole 6 is provided on the fixing flange 40102 at the rear end of the first outer cylinder section. The fixing flange 40102 at the rear end of the first outer cylinder section is axially threadedly connected by a locking screw passing through the through hole 6 on the fixing flange 40102 at the rear end of the first outer cylinder section and the threaded hole 17 on the oil inlet fixing seat 14, so that the oil inlet fixing seat 14 and the rear end face of the first outer cylinder section 401 are axially fixed and locked.

[0063] An oil sealing ring 13 is fixedly provided between the axial groove surface of the first positioning groove 1403 and the rear end end surface of the first outer cylinder section 401. The axial groove surface of the first positioning groove 1403 and the rear end end surface of the first outer cylinder section 401 are sealed and fixedly connected via the oil sealing ring 13. An oil sealing ring 13 is fixedly provided between the radial groove surface of the first positioning groove 1403 and the outer surface of the first outer cylinder section 401. The radial groove surface of the first positioning groove 1403 and the outer surface of the first outer cylinder section 401 are sealed and fixedly connected via the oil sealing ring 13. The oil sealing ring 13 can prevent the lubricating oil in the piston rod sliding cavity 23 or the oil inner cavity 105 from leaking outward along the oil inlet fixed seat 14 and the first outer cylinder section 401.

[0064] A piston rod positioning column 1402 is provided in the radial middle position of the oil inlet fixing seat 14, and the front end of the piston rod positioning column 1402 is located inside the first outer cylinder section 401. The outer diameter of the piston rod positioning column 1402 matches the inner diameter of the piston rod positioning column accommodating groove 70201. When the piston rod 7 slides backward, the piston rod positioning column 1402 can enter the interior of the piston rod positioning column accommodating groove 70201, which plays a certain limiting role on the piston rod 7 and prevents the piston rod 7 from shaking when sliding. An axially penetrating oil flow hole 1401 is provided between the piston rod positioning column 1402 and the first positioning groove 1403, and the oil flow hole 1401 and the piston rod sliding cavity 23 are connected to each other.

[0065] The rear end face of the oil inlet fixed seat 14 is located at the outer position of the oil flow through hole 1401, and an oil inlet sleeve 1 is provided. An oil sealing ring 13 is fixedly provided between the oil inlet sleeve 1 and the oil inlet fixed seat 14. The rear end face of the oil inlet fixed seat 14 is located at the outer position of the piston rod sliding cavity 23 and is axially sealed and fixedly connected with the front end face of the oil inlet sleeve 1 through the oil sealing ring 13. The rear end face of the oil inlet sleeve 1 is provided with a sleeve end cover 2. An oil sealing ring 13 is fixedly provided between the sleeve end cover 2 and the rear end face of the oil inlet sleeve 1. The sleeve end cover 2 and the rear end face of the oil inlet sleeve 1 are axially sealed and fixedly connected through the oil sealing ring 13. An oil inner cavity 105 is provided inside the oil inlet sleeve 1, and the oil inner cavity 105, the oil flow through hole 1401 and the piston rod sliding cavity 23 are interconnected.

[0066] An exhaust channel 104 is provided on the oil inlet sleeve 1, and the inner channel opening of the exhaust channel 104 and the oil inner cavity 105 are communicated with each other, and a second exhaust channel hole 101 and a first exhaust channel hole 102 are fixedly provided on the outer channel opening of the exhaust channel 104, and the outer channel opening of the exhaust channel 104, the second exhaust channel hole 101 and the first exhaust channel hole 102 are communicated with each other, and the second exhaust channel hole 101 and the first exhaust channel hole 102 respectively penetrate to the outer surface of the oil inlet sleeve 1, and a sealing ball 20 is provided at the outer channel opening of the exhaust channel 104, and a threaded top screw 22 is provided in the first exhaust channel hole 102, and the threaded top screw 22 is tightened inwardly and presses the sealing ball 20 to seal the outer channel opening of the exhaust channel 104, and a sleeve oil inlet hole 103 is provided on the oil inlet sleeve 1, and the sleeve oil inlet hole 103 and the oil inner cavity 105 are communicated with each other, and the hydraulic oil enters the oil inner cavity 105 from the sleeve oil inlet hole 103.

[0067] When the plunger-type oil cylinder is used for the first time or is used again after being disassembled and overhauled, air is inevitably present inside. At this time, the threaded top screw 22 is turned outward, and the threaded top screw 22 slowly moves away from the sealing ball 20. The internal pressure of the oil cavity 105 pushes the sealing ball 20 outward through the exhaust channel 104, and the air inside the oil cavity 105 is discharged outward through the exhaust channel 104 and the second exhaust channel hole 101 in turn. When the oil is discharged continuously, it means that the air in the oil cavity 105 has been discharged. At this time, tighten the threaded top screw 22, and the threaded top screw 22 pushes the sealing ball 20 to seal the exhaust channel 104, and the oil cylinder can operate normally.

[0068] A support flange 15 is provided at the front end of the third outer cylinder section 403, a second positioning groove 1501 is provided on the outer surface of the support flange 15 near the rear end, a third positioning groove 1502 is provided on the outer surface of the support flange 15 near the front end, and a fourth positioning groove 1503 is provided on the inner surface of the support flange 15 near the front end.

[0069] An external connecting sleeve 5 is provided on the outer surface of the third outer cylinder section 403 and the outer surface of the supporting flange 15, and a position between the front end fixing flange 40301 of the third outer cylinder section and the axial groove surface of the second positioning groove 1501 is provided with a external connecting sleeve 5, and an axial threaded hole 17 is provided on the front end face and the rear end face of the external connecting sleeve 5 respectively, and an axial through hole 6 is provided between the axial groove surface of the second positioning groove 1501 and the axial groove surface of the third positioning groove 1502, and the supporting flange 15 is threadedly locked by passing a locking screw through the through hole 6 and the threaded hole 17 on the front end face of the supporting flange 15, so that the supporting flange 15 and the external connecting sleeve 5 are axially fixed and locked, and an axial through hole 6 is provided on the front end fixing flange 40301 of the third outer cylinder section, and the front end fixing flange 40301 of the third outer cylinder section is threadedly locked by passing a locking screw through the through hole 6 and the threaded hole 17 on the rear end face of the supporting flange 15, so that the third outer cylinder section 403 and the supporting flange 15 are axially fixed and locked.

[0070] The rear end of the support flange 15 is provided with a locking sealing nut 10, and a fifth positioning groove 1001 is provided inside the middle position of the locking sealing nut 10, and a combined sealing ring fixing sleeve 19 is fixedly provided on the axial groove surface of the fifth positioning groove 1001 and the axial groove surface of the fourth positioning groove 1503, respectively, and a combined sealing ring 16 is fixedly provided between the two combined sealing ring fixing sleeves 19, and the inner surface of the rear end position of the locking sealing nut 10 is provided with internal thread teeth 1002, and the outer surface of the radial groove surface of the third positioning groove 1502 is provided with external thread teeth 1504, and the internal thread teeth 1002 are fixedly provided with the outer surface of the radial groove surface of the third positioning groove 1502. The external thread teeth 1504 are threadedly locked with each other, and the support flange 15 and the locking sealing nut 10 are axially fixed and locked. While the support flange 15 and the locking sealing nut 10 are axially fixed and locked, the fifth positioning groove 1001, the combined sealing ring fixing sleeve 19, and the combined sealing ring 16 are axially locked with each other. The inner surface of the combined sealing ring 16 exceeds the inner surface position of the combined sealing ring fixing sleeve 19. The combined sealing ring 16 and the outer surface of the piston rod 7 are slidingly sealed and connected. The inner surface of the front end of the locking sealing nut 10 and the outer surface of the piston rod 7 are slidingly fixed and connected.

[0071] Since the oil cylinder is used in a large gantry grinder, the piston rod 7 has a long moving stroke, a fast moving speed, and is subjected to a large pressure, and higher requirements are placed on the oil sealing performance at the front end of the outer cylinder body and the position where the piston rod is separated and connected. By providing a combined sealing ring 16 between the piston rod 7 and the supporting flange 15 at the front end of the outer cylinder body, the combined sealing ring 16 has a multi-layer sealing structure, which can prevent the hydraulic oil in the piston rod sliding chamber 23 from impacting the sealing structure at the front end of the outer cylinder body and the position where the piston rod is separated and connected under the dual effects of pressure and inertia when the piston rod 7 moves forward at high speed, thereby causing oil leakage.

[0072] A sixth positioning groove 70101 is provided at the front end position of the outer surface of the front end fixing section 701 of the piston rod, and a machine tool worktable fixing seat 8 is fixedly provided on the radial groove surface of the sixth positioning groove 70101, the machine tool worktable fixing seat 8 and the machine tool worktable are fixedly connected, the machine tool worktable fixing seat 8 and the axial groove surface of the sixth positioning groove 70101 are axially fixedly connected, the front end of the machine tool worktable fixing seat 8 is located on the radial groove surface of the sixth positioning groove 70101 and is connected to a locking nut 9, the radial groove surface of the sixth positioning groove 70101 is provided with external thread teeth, the locking nut 9 and the radial groove surface of the sixth positioning groove 70101 are threadedly locked, and the locking nut 9, the machine tool worktable fixing seat 8 and the axial groove surface of the sixth positioning groove 70101 are axially locked and fixed to each other.

[0073] A self-lubricating bearing 21 is fixedly provided between the front end face of the first outer cylinder section 401 and the rear end face of the second outer cylinder section 402, the self-lubricating bearing 21 is fixedly connected to the inner surface of the external connecting sleeve 5, the inner surface of the self-lubricating bearing 21 exceeds the inner surface position of the first outer cylinder section 401 and the second outer cylinder section 402, and is slidably fixedly connected to the outer surface of the piston rod 7, a self-lubricating bearing 21 is fixedly provided between the front end face of the second outer cylinder section 402 and the rear end face of the third outer cylinder section 403, the self-lubricating bearing 21 is fixedly connected to the inner surface of the external connecting sleeve 5, the inner surface of the self-lubricating bearing 21 exceeds the inner surface position of the second outer cylinder section 402 and the third outer cylinder section 403, and is slidably fixedly connected to the outer surface of the piston rod 7, the third outer cylinder section 40 A self-lubricating bearing 21 is fixedly provided between the front end face of the piston rod 3 and the rear end face of the support flange 15. The self-lubricating bearing 21 is fixedly connected to the inner surface of the external connecting sleeve 5. The inner surface of the self-lubricating bearing 21 exceeds the inner surface position of the third outer cylinder section 403 and the support flange 15, and is slidably fixedly connected to the outer surface of the piston rod 7. When the piston rod moves, the outer surface of the piston rod and the inner surface of the self-lubricating bearing contact each other. The self-lubricating bearing lubricates the outer surface of the piston rod, greatly improves the smoothness and stability of the piston rod when sliding for a long time, reduces the resistance of the piston rod 7 when moving, and can reduce the noise generated when the piston rod slides, reduce the cylinder temperature caused by the movement of the piston cylinder 7, and extend the overall service life of the cylinder.

[0074] A spherical washer 11 is fixed on the axial groove surface of the sixth positioning groove 70101, and a conical washer 12 is fixed on the front end of the spherical washer 11. The front end of the conical washer 12 is fixedly connected to the rear end of the machine tool worktable fixing seat 8. The front end of the machine tool worktable fixing seat 8 is fixed with a conical washer 12, and the front end of the conical washer 12 is fixed with a spherical washer 11. The front end of the spherical washer 11 is fixed with a locking nut 9. The locking nut 9 and the radial groove surface of the sixth positioning groove 70101 are threadedly locked, and the locking nut 9, the spherical washer 11, the conical washer 12, the machine tool worktable fixing seat 8, and the axial groove surfaces of the sixth positioning groove 70101 are axially locked and fixed to each other.

[0075] During installation, tighten the locking screw 9, and the spherical washers 11 and conical washers 12 on both sides of the machine tool worktable fixed seat 8 are tightened against each other, which can further ensure the firmness of the locking of the machine tool worktable fixed seat 8 and prevent the locking screw 9 from loosening during long-term high-speed movement of the piston rod 7, causing the machine tool worktable fixed seat 8 to shake or even fall off, which directly affects the normal movement of the machine tool worktable.

[0076] A dustproof sealing ring 18 is provided between the inner surface of the front end of the locking sealing nut 10 and the outer surface of the piston rod 7. The inner surface of the front end of the locking sealing nut 10 and the outer surface of the piston rod 7 are slidingly sealed and connected via the dustproof sealing ring 18. The dustproof sealing ring 18 can prevent foreign matter and impurities in the external environment from entering the interior of the cylinder, causing varying degrees of damage to the interior of the cylinder, thereby further extending the service life of the cylinder.

[0077] There are multiple sleeve oil inlet holes 103, and hydraulic oil can be input into the cylinder through multiple sleeve oil inlet holes 103 at the same time, ensuring that there is a sufficiently large oil pressure inside the cylinder, further increasing the sliding speed of the piston rod, and fully meeting the requirements of high-speed movement of the worktable on a large gantry grinder.

[0078] There are multiple locking nuts 9, which play a role of mutual locking between the locking nuts 9, further preventing the locking screws 9 from loosening due to the piston rod 7 moving at high speed for a long time, causing the machine tool worktable fixing seat 8 to shake or even fall off.

[0079] The outer surface of the first outer cylinder section 401 is fixedly provided with a fixed support seat 3, the outer surface of the second outer cylinder section 402 is fixedly provided with a fixed support seat 3, the outer surface of the third outer cylinder section 403 is fixedly provided with a fixed support seat 3, and the outer surface of the external connecting sleeve 5 at the front end of the third outer cylinder section 403 is fixedly provided with a fixed support seat 3. The outer cylinder body 4 is supported and fixed at multiple points, which can reduce the resonance generated by the piston rod 7 on the outer cylinder body 4 when the piston rod 7 moves at high speed, and can avoid the problem of oil leakage between the connected outer cylinder sections.

[0080] The plunger-type oil cylinder, whose outer cylinder body and piston rod both adopt a multi-segment assembly structure, can be assembled by splicing multiple segments according to the actual required moving length of the grinding machine worktable, so as to meet the large-stroke moving requirements of the grinding machine worktable.

[0081] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A plunger-type oil cylinder for a large gantry grinder worktable, characterized by: An oil cylinder outer cylinder body is provided, and the oil cylinder outer cylinder body includes a first outer cylinder section, a second outer cylinder section, and a third outer cylinder section. A first outer cylinder section front end fixing flange is fixedly provided on the outer surface of the first outer cylinder section near the front end, a first outer cylinder section rear end fixing flange is fixedly provided on the outer surface of the first outer cylinder section near the rear end, a second outer cylinder section front end fixing flange is fixedly provided on the outer surface of the second outer cylinder section near the front end, a second outer cylinder section rear end fixing flange is fixedly provided on the outer surface of the second outer cylinder section near the rear end, a third outer cylinder section front end fixing flange is fixedly provided on the outer surface of the third outer cylinder section near the front end, and a third outer cylinder section rear end fixing flange is fixedly provided on the outer surface of the third outer cylinder section near the rear end; An external connecting sleeve is provided on the outer circumference of the first outer cylinder section and the second outer cylinder section at a position between the front end fixing flange of the first outer cylinder section and the rear end fixing flange of the second outer cylinder section, threaded holes are provided on the axial end faces of both sides of the external connecting sleeve, axial through holes are provided on the front end fixing flange of the first outer cylinder section and the rear end fixing flange of the second outer cylinder section, the front end fixing flange of the first outer cylinder section and the rear end fixing flange of the second outer cylinder section are axially threadedly connected through locking screws respectively passing through the through holes on the front end fixing flange of the first outer cylinder section, the rear end fixing flange of the second outer cylinder section and the threaded hole on the external connecting sleeve, after the front end fixing flange of the first outer cylinder section and the rear end fixing flange of the second outer cylinder section are axially connected to the external connecting sleeve respectively, the front end part of the first outer cylinder section and the rear end part of the second outer cylinder section are axially fixed and locked; An oil sealing ring is provided between the rear end position of the inner surface of the external connection sleeve and the outer surface of the first outer cylinder section, and the rear end position of the inner surface of the external connection sleeve and the outer surface of the first outer cylinder section are sealed and fixedly connected via the oil sealing ring; an oil sealing ring is provided between the front end position of the inner surface of the external connection sleeve and the outer surface of the second outer cylinder section, and the front end position of the inner surface of the external connection sleeve and the outer surface of the second outer cylinder section are sealed and fixedly connected via the oil sealing ring; An external connecting sleeve is provided at a position on the outer circumference of the second outer cylinder section and the third outer cylinder section between the front end fixing flange of the second outer cylinder section and the rear end fixing flange of the third outer cylinder section, threaded holes are provided on the axial end faces of both sides of the external connecting sleeve, axial through holes are provided on the front end fixing flange of the second outer cylinder section and the rear end fixing flange of the third outer cylinder section, the front end fixing flange of the second outer cylinder section and the rear end fixing flange of the third outer cylinder section are axially threadedly connected through the through holes on the front end fixing flange of the second outer cylinder section and the rear end fixing flange of the third outer cylinder section and the threaded holes on the external connecting sleeve respectively through locking screws, after the front end fixing flange of the second outer cylinder section and the rear end fixing flange of the third outer cylinder section are axially connected to the external connecting sleeve respectively, the front end part of the second outer cylinder section and the rear end part of the third outer cylinder section are axially fixed and locked; An oil sealing ring is provided between the rear end position of the inner surface of the external connecting sleeve and the outer surface of the second outer cylinder segment, and the rear end position of the inner surface of the external connecting sleeve and the outer surface of the second outer cylinder segment are sealed and fixedly connected via the oil sealing ring; an oil sealing ring is provided between the front end position of the inner surface of the external connecting sleeve and the outer surface of the third outer cylinder segment, and the front end position of the inner surface of the external connecting sleeve and the outer surface of the third outer cylinder segment are sealed and fixedly connected via the oil sealing ring; After the first outer cylinder section, the second outer cylinder section and the third outer cylinder section are axially fixedly connected, a piston rod sliding cavity is formed inside the first outer cylinder section, the second outer cylinder section and the third outer cylinder section, a piston rod is arranged in the piston rod sliding cavity, and the piston rod can slide forward and backward along the piston rod sliding cavity, a piston rod intermediate connecting section is arranged in the middle position of the piston rod, a piston rod front end fixing section is fixedly arranged at the front end of the piston rod intermediate connecting section, a piston rod rear end fixing section is fixedly arranged at the rear end of the piston rod intermediate connecting section, and a piston rod positioning column accommodating groove is arranged in the middle position of the axial rear end of the piston rod rear end fixing section; An oil inlet fixing seat is provided at the rear end of the first outer cylinder section, a first positioning groove is provided along the circumferential direction at the front end of the oil inlet fixing seat near the outer circumference, an axial threaded hole is provided at the outer end surface of the first positioning groove at the front end of the oil inlet fixing seat, an axial through hole is provided on the fixing flange at the rear end of the first outer cylinder section, the fixing flange at the rear end of the first outer cylinder section is axially threadedly connected through the through hole on the fixing flange at the rear end of the first outer cylinder section and the threaded hole on the oil inlet fixing seat by a locking screw, so that the oil inlet fixing seat and the rear end surface of the first outer cylinder section are axially fixed and locked; An oil sealing ring is fixedly arranged between the axial groove surface of the first positioning groove and the rear end surface of the first outer cylinder segment, and the axial groove surface of the first positioning groove and the rear end surface of the first outer cylinder segment are sealed and fixedly connected via the oil sealing ring; an oil sealing ring is fixedly arranged between the radial groove surface of the first positioning groove and the outer surface of the first outer cylinder segment, and the radial groove surface of the first positioning groove and the outer surface of the first outer cylinder segment are sealed and fixedly connected via the oil sealing ring; A piston rod positioning column is provided at the radial middle position of the oil inlet fixing seat, the front end of which is located inside the first outer cylinder section, an axially penetrating oil flow through hole is provided between the piston rod positioning column and the first positioning groove, and the oil flow through hole and the piston rod sliding cavity are communicated with each other; The rear end face of the oil inlet fixing seat is located at the outer position of the oil flow through hole, and an oil inlet sleeve is provided. An oil sealing ring is fixedly provided between the oil inlet sleeve and the oil inlet fixing seat. The rear end face of the oil inlet fixing seat is located at the outer position of the piston rod sliding cavity and is axially sealed and fixedly connected with the front end face of the oil inlet sleeve through the oil sealing ring. The rear end face of the oil inlet sleeve is provided with a sleeve end cover, and an oil sealing ring is fixedly provided between the sleeve end cover and the rear end face of the oil inlet sleeve. The sleeve end cover and the rear end face of the oil inlet sleeve are axially sealed and fixedly connected through the oil sealing ring. An oil inner cavity is provided inside the oil inlet sleeve, and the oil inner cavity, the oil flow through hole and the piston rod sliding cavity are connected to each other. The oil inlet sleeve is provided with an exhaust channel, the inner channel opening of the exhaust channel and the oil inner cavity are communicated with each other, the outer channel opening of the exhaust channel is fixedly provided with a second exhaust channel hole and a first exhaust channel hole, the outer channel opening of the exhaust channel, the second exhaust channel hole and the first exhaust channel hole are communicated with each other, the second exhaust channel hole and the first exhaust channel hole respectively penetrate to the outer surface of the oil inlet sleeve, a sealing ball is provided at the outer channel opening of the exhaust channel, a threaded top screw is provided in the first exhaust channel hole, the threaded top screw is tightened inwardly, and the sealing ball is pressed to seal the outer channel opening of the exhaust channel; The oil inlet sleeve is provided with a sleeve oil inlet hole, and the sleeve oil inlet hole and the oil inner cavity are connected to each other; A support flange is provided at the front end of the third outer cylinder section, a second positioning groove is provided on the outer surface of the support flange near the rear end, a third positioning groove is provided on the outer surface of the support flange near the front end, and a fourth positioning groove is provided on the inner surface of the support flange near the front end; The outer surface of the third outer cylinder segment and the outer surface of the supporting flange are located between the front end fixing flange of the third outer cylinder segment and the axial groove surface of the second positioning groove, and an external connecting sleeve is provided. The front end face and the rear end face of the external connecting sleeve are respectively provided with axial threaded holes. The position between the axial groove surface of the second positioning groove and the axial groove surface of the third positioning groove is provided with an axially penetrating through hole. The supporting flange is threadedly locked by passing a locking screw through the through hole and the threaded hole on the front end face of the supporting flange, so that the supporting flange and the external connecting sleeve are axially fixed and locked. An axial through hole is provided on the front end fixing flange of the third outer cylinder segment. The front end fixing flange of the third outer cylinder segment is threadedly locked by passing a locking screw through the through hole and the threaded hole on the rear end face of the supporting flange, so that the third outer cylinder segment and the supporting flange are axially fixed and locked. A locking sealing nut is provided at the rear end of the supporting flange, a fifth positioning groove is provided inside the middle position of the locking sealing nut, a combined sealing ring fixing sleeve is fixedly provided on the axial groove surface of the fifth positioning groove and the axial groove surface of the fourth positioning groove, respectively, a combined sealing ring is fixedly provided between the two combined sealing ring fixing sleeves, an inner surface at the rear end position of the locking sealing nut is provided with internal threaded teeth, and an outer surface of the radial groove surface of the third positioning groove is provided with external threaded teeth, the internal threaded teeth and the external threaded teeth are thread-locked with each other, and the supporting flange and the locking sealing nut are axially fixed and locked, that is, the supporting flange and the locking sealing nut are axially fixed and locked, and at the same time, the fifth positioning groove, the combined sealing ring fixing sleeve and the combined sealing ring are axially locked with each other, the inner surface of the combined sealing ring exceeds the inner surface position of the combined sealing ring fixing sleeve, the combined sealing ring and the outer surface of the piston rod are slidingly sealed and connected, and the inner surface of the front end of the locking sealing nut and the outer surface of the piston rod are slidingly fixed and connected; A sixth positioning groove is provided at the front end position of the outer surface of the front end fixing section of the piston rod, a machine tool worktable fixing seat is fixedly provided on the radial groove surface of the sixth positioning groove, the machine tool worktable fixing seat and the axial groove surface of the sixth positioning groove are axially fixedly connected, the front end of the machine tool worktable fixing seat is located on the radial groove surface of the sixth positioning groove and is connected to a locking nut, the radial groove surface of the sixth positioning groove is provided with external thread teeth, the locking nut and the radial groove surface of the sixth positioning groove are threadedly locked, and the locking nut, the machine tool worktable fixing seat and the axial groove surface of the sixth positioning groove are axially locked and fixed to each other.

2. The plunger-type oil cylinder for a large gantry grinder worktable according to claim 1 is characterized in that: A self-lubricating bearing is fixedly arranged between the front end surface of the first outer cylinder section and the rear end surface of the second outer cylinder section, the self-lubricating bearing is fixedly connected to the inner surface of the external connecting sleeve, the inner surface of the self-lubricating bearing exceeds the inner surface position of the first outer cylinder section and the second outer cylinder section, and is slidably fixedly connected to the outer surface of the piston rod; A self-lubricating bearing is fixedly arranged between the front end surface of the second outer cylinder segment and the rear end surface of the third outer cylinder segment, the self-lubricating bearing is fixedly connected to the inner surface of the external connecting sleeve, the inner surface of the self-lubricating bearing exceeds the inner surface position of the second outer cylinder segment and the third outer cylinder segment, and is slidably fixedly connected to the outer surface of the piston rod; A self-lubricating bearing is fixedly provided between the front end face of the third outer cylinder section and the rear end face of the support flange, the self-lubricating bearing is fixedly connected to the inner surface of the external connecting sleeve, the inner surface of the self-lubricating bearing exceeds the inner surface position of the third outer cylinder section and the support flange, and is slidably fixedly connected to the outer surface of the piston rod.

3. The plunger-type oil cylinder for a large gantry grinder worktable according to claim 1, characterized in that: A spherical washer is fixed on the axial groove surface of the sixth positioning groove, a conical washer is fixed on the front end of the spherical washer, the front end of the conical washer is fixedly connected to the rear end of the machine tool worktable fixing seat, the front end of the machine tool worktable fixing seat is fixed with a conical washer, the front end of the conical washer is fixed with a spherical washer, the front end of the spherical washer is fixed with a locking nut, the locking nut and the radial groove surface of the sixth positioning groove are threadedly locked, and the locking nut, spherical washer, conical washer, machine tool worktable fixing seat and the axial groove surface of the sixth positioning groove are axially locked and fixed to each other.

4. The plunger-type oil cylinder for a large gantry grinder worktable according to claim 1, characterized in that: A dustproof sealing ring is provided between the inner surface of the front end of the locking sealing nut and the outer surface of the piston rod, and the inner surface of the front end of the locking sealing nut and the outer surface of the piston rod are slidingly sealed and connected via the dustproof sealing ring.

5. The plunger-type oil cylinder for a large gantry grinder worktable according to claim 1, characterized in that: The sleeve has a plurality of oil inlet holes.

6. The plunger type oil cylinder for a large gantry grinder worktable according to claim 1, characterized in that: The number of the locking nuts is multiple.

7. The plunger-type oil cylinder for a large gantry grinder worktable according to claim 1, characterized in that: A fixed support seat is fixedly provided on the outer surface of the first outer cylinder segment, a fixed support seat is fixedly provided on the outer surface of the second outer cylinder segment, a fixed support seat is fixedly provided on the outer surface of the third outer cylinder segment, and a fixed support seat is fixedly provided on the outer surface of the external connecting sleeve at the front end of the third outer cylinder segment.

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