Two-stage mechanical locking oil cylinder with position detection function

Abstract

The utility model relates to the technical field of multi-stage oil cylinders, in particular to a two-stage mechanical locking oil cylinder with a position detection function, which comprises an outer cylinder barrel, a first-stage piston component, a second-stage piston component and a position detection mechanism, the first-stage piston component and the second-stage piston component are arranged in the outer cylinder barrel, and the position detection mechanism is arranged outside the outer cylinder barrel. The second-stage locking mechanism comprises a second steel ball and a second groove, the second steel ball is arranged on the peripheral edge of a second-stage piston of the second-stage piston assembly, the second groove is formed in a locking sleeve, and the locking sleeve is arranged on the inner wall of a first-stage piston rod of the first-stage piston assembly; the position detection mechanism comprises a displacement sensor and a telescopic rod assembly, the telescopic rod assembly comprises a second telescopic rod assembly and a first telescopic rod assembly, the output end of the displacement sensor is connected with a second piston of the second telescopic rod assembly, and the extending end of the second telescopic rod assembly is connected with the extending end of the second-stage piston assembly. Due to two-stage steel ball type locking, position keeping of two positions can be achieved; the stroke of the oil cylinder at any position can be detected; the structure is compact, lightweight design is achieved, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-stage oil cylinders, in particular to a two-stage mechanical locking oil cylinder with position detection. Background Technique

[0002] At present, military vehicles need to lift the array surface to two specific working positions and maintain long-term locking, with high precision requirements. Therefore, an oil cylinder solution that can achieve reliable locking at two positions is required. The common locking solutions on the market are as follows: (a) Conventional hydraulic locking methods, such as using a hydraulic control check valve, as Figure 1 shown; (b) Mechanical locking at any position, such as using an imported clamping device, as Figure 2 shown. For the conventional hydraulic locking method, displacement is inevitably generated due to its own leakage, and it is difficult to meet the requirements of long-term maintenance and high precision. Therefore, the locking effect cannot meet the actual use requirements. For mechanical locking at any position, although this solution can meet the use requirements, the disadvantage is that the control is too cumbersome. An unlocking oil circuit needs to be set separately. For movement at non-working positions, displacement can only be achieved after unlocking by passing oil, with high energy consumption, and the clamping device has a high cost and large weight, which does not meet the project indicators.

[0003] The patent with the publication number CN101625003A discloses a double-stage locking cylinder. There is a first-stage locking mechanism on the large piston rod assembly, which is composed of a large pressure ring at the right end of the large piston, a large annular groove on the large piston sleeve rod, and large steel balls on the large end cover. There is a second-stage locking mechanism composed of a small pressure ring, a small annular groove, and small steel balls on the small piston assembly. Such a two-stage locking mechanism is difficult to lock or has a high locking pressure, and the parts processing is complex. It is impossible to ensure the compactness in the length direction, resulting in a relatively large overall volume.

[0004] The patent with the publication number CN217080952U discloses a two-stage oil cylinder with sensors. A sensing oil cylinder is connected to the outside of the cylinder barrel, and a first sensor is arranged inside the rod head of the second-stage piston rod. The stroke of the oil cylinder is detected by two independent sensors, and the synchronization with the operation of the oil cylinder is poor. Summary of the Invention

[0005] The technical problem to be solved by the utility model is: to provide a two-stage mechanical locking oil cylinder with position detection in order to solve the problems existing in the prior art in the above-mentioned background technique.

[0006] The technical solution adopted by the utility model to solve its technical problem is: a two-stage mechanical locking oil cylinder with position detection, including an outer cylinder barrel, a first-stage piston assembly and a second-stage piston assembly arranged inside the outer cylinder barrel. There is a first-stage locking mechanism on the first-stage piston assembly,

[0007] A secondary locking mechanism is provided on the secondary piston assembly. The secondary locking mechanism includes a second steel ball and a second groove that houses and is adapted to the second steel ball. The second steel ball is disposed on the outer periphery of the secondary piston of the secondary piston assembly and is configured to be axially movable along the inner surface of the primary piston rod of the primary piston assembly. The second groove is formed on a locking sleeve, and the locking sleeve is disposed on the inner wall of the primary piston rod;

[0008] A position detection mechanism is provided outside the outer cylinder. The position detection mechanism includes a displacement sensor and a telescopic rod assembly. The telescopic rod assembly includes a second telescopic rod assembly and a first telescopic rod assembly that are nested inside and outside each other. The output end of the displacement sensor is connected to the second piston of the second telescopic rod assembly, and the extending end of the second telescopic assembly is connected to the extending end of the secondary piston assembly.

[0009] Further, the secondary piston assembly includes a secondary piston, a secondary piston rod, a sliding seat, and a secondary spring. The secondary piston is connected to one end of the secondary piston rod. The sliding seat is disposed on the outer periphery of the secondary piston rod. A secondary spring is provided on one side of the sliding seat. The secondary spring is limited by a primary end cover located at the end of the primary piston rod, and the secondary spring is disposed between the sliding seat and the primary end cover. Radial through holes are provided on the outer periphery of the secondary piston, and the second steel balls are accommodated in the through holes and can move radially relative to the through holes.

[0010] Even further, a secondary oil passage is axially formed inside the secondary piston rod. One end of the secondary piston rod away from the secondary piston is connected to an upper support ear. A secondary rod chamber oil hole communicating with the secondary oil passage is provided on the upper support ear, and the secondary rod chamber oil hole communicates with the secondary oil passage.

[0011] Even further, the second telescopic rod assembly includes a second telescopic rod and a second piston connected to one end of the second telescopic rod. The output end of the displacement sensor has a locking buckle, and the locking buckle is connected to the second piston by a pin. The other end of the second telescopic rod is connected to the upper support ear through a second connecting plate.

[0012] Even further, the second connecting plate is L-shaped, and the end of the vertical section of the L-shaped second connecting plate is connected to the end of the second telescopic rod through a tightening nut.

[0013] Further, the displacement sensor is connected to a first connecting plate, and the first connecting plate is fixed to the outer cylinder. A protective cover is provided between the displacement sensor and the telescopic rod assembly.

[0014] Further, the first telescopic rod assembly includes a first telescopic rod, a first piston, and an end cover. The first piston is connected to one end of the first telescopic rod, and the end cover is disposed at the other end of the first telescopic rod.

[0015] Further, the primary piston assembly includes a primary piston rod, a connecting column, a gland, a primary piston, a primary first spring, and a primary second spring. One end of the primary piston rod is fixed with a connecting column. A primary piston and a gland are arranged on the outer periphery of the connecting column. A wire snap ring is arranged between the primary piston and the gland. The gland is limited by the protruding part of the connecting column and a primary first spring is arranged between the gland and the primary piston. A primary second spring is arranged at the other end of the primary piston. The primary second spring is connected to a nut, and the nut is sleeved on one end of the connecting column away from the gland.

[0016] Furthermore, one end of the outer cylinder is connected to a lower lug. An oil port for the rodless cavity is opened on the lower lug. A primary oil port for the rod cavity is opened at one end of the outer cylinder away from the lower lug. The cavity formed by the primary piston rod and the cylinder is communicated with the primary oil port for the rod cavity. A transition oil passage is axially opened in the connecting column.

[0017] Furthermore, the primary locking mechanism includes a first steel ball and a first groove for carrying and adapting to the first steel ball. The first steel ball is arranged on a guide sleeve and is configured to be able to axially move along the outer surface of the primary piston rod. The guide sleeve is arranged on the inner wall of the outer cylinder. The first groove is opened on the outer periphery of the connecting column.

[0018] The beneficial effects of the present utility model: Compared with the prior art,

[0019] In the secondary locking mechanism of the present utility model, the second steel ball is arranged on the outer edge of the secondary piston, and the second groove is opened on the locking sleeve. After the two cooperate, mechanical locking is achieved, and the position where the oil cylinder needs to extend can be maintained for a long time. The length direction is more compact, saving space; the processing of parts is easier to achieve and it is easier to lock;

[0020] The secondary locking mechanism and the primary locking mechanism form a two-stage steel ball type locking, which can achieve the position holding of two positions;

[0021] When each stage of the oil piston rod reaches the end of the stroke, it is automatically locked, and the control is simpler, more direct, and has high precision;

[0022] When unlocking, oil enters from the primary oil port for the rod cavity and is controlled separately, which can ensure the retraction sequence, that is, unlocking does not require a separate oil circuit control, simplifies the overall structure, is lighter in weight, and meets the requirements of lightweight design;

[0023] The position detection mechanism composed of a displacement sensor + a telescopic rod can realize the detection of any position, and the synchronization is effectively guaranteed. Description of the Drawings

[0024] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0025] Figure 1 It is a schematic structural diagram of a cylinder with conventional hydraulic locking in the prior art.

[0026] Figure 2 It is a schematic structural diagram of a cylinder with a clamping device in the prior art.

[0027] Figure 3 It is a schematic structural diagram of the present utility model.

[0028] Figure 4 It is Figure 3 an enlarged structural diagram of part I in

[0029] Figure 5 It is Figure 3 an enlarged structural diagram of part II in

[0030] Figure 6 It is a schematic structural diagram of the first-stage piston assembly of the present utility model extending.

[0031] Figure 7 It is a schematic structural diagram of the second-stage piston assembly of the present utility model extending.

[0032] In the figure: 1. outer cylinder barrel, 2. first-stage piston rod, 3. connecting column, 4. gland, 5. first-stage piston, 6. first-stage first spring, 7. first-stage second spring, 8. wire snap ring, 9. nut, 10. first steel ball, 11. first groove, 12. guide sleeve, 13. second-stage piston, 14. second-stage piston rod, 141. second-stage oil passage, 15. sliding seat, 16. second-stage spring, 17. first-stage end cover, 18. second steel ball, 19. second groove, 20. locking sleeve, 21. upper ear, 22. second-stage rod-end chamber oil hole, 23. lower ear, 24. rodless chamber oil port, 25. first-stage rod-end chamber oil port, 26. transition oil passage, 27. displacement sensor, 271. pull rope, 28. first telescopic rod, 29. first piston, 30. end cover, 31. second telescopic rod, 32. second piston, 33. second connecting plate, 34. jam nut, 35. first connecting plate, 36. protective cover, 37. pin. Detailed implementation manners

[0033] Now, the present utility model will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0034] As Figure 3 shown, a two-stage mechanical locking cylinder with position detection includes an outer cylinder barrel 1, a first-stage piston assembly, a second-stage piston assembly arranged inside the outer cylinder barrel 1, and a position detection mechanism arranged outside the outer cylinder barrel 1.

[0035] As Figure 3 andFigure 4 As shown in the figure, the first-stage piston assembly includes a first-stage piston rod 2, a connecting column 3, a gland 4, a first-stage piston 5, a first-stage first spring 6, and a first-stage second spring 7. One end of the first-stage piston rod 2 is fixed with a connecting column 3. A first-stage piston 5 and a gland 4 are provided on the outer periphery of the connecting column 3. A wire snap ring 8 is arranged between the first-stage piston 5 and the gland 4. The wire snap ring 8 can prevent the first-stage piston 5 from rotating during movement. The gland 4 is limited by the convex part of the connecting column 3, and a first-stage first spring 6 is arranged between the gland 4 and the first-stage piston 5. The other end of the first-stage piston 5 is provided with a first-stage second spring 7. The first-stage second spring 7 is connected to a nut 9. The nut 9 is sleeved on one end of the connecting column 3 away from the gland 4. A first-stage locking mechanism is provided on the first-stage piston assembly. The first-stage locking mechanism includes a first steel ball 10 and a first groove 11 that houses and is adapted to the first steel ball 10. The first steel ball 10 is arranged on a guide sleeve 12 and is configured to be able to axially move along the outer surface of the first-stage piston rod 2. The guide sleeve 12 is arranged on the inner wall of the outer cylinder 1. The first groove 11 is opened on the outer periphery of the connecting column 3. More specifically, the guide sleeve 12 is provided with a radial through hole. The first steel ball 10 is accommodated in the through hole and can radially move relative to the through hole.

[0036] As Figure 3 and Figure 5 shown in the figure, the second-stage piston assembly includes a second-stage piston 13, a second-stage piston rod 14, a sliding seat 15, and a second-stage spring 16. The second-stage piston 13 is connected to one end of the second-stage piston rod 14. The sliding seat 15 is arranged on the outer periphery of the second-stage piston rod 14. A second-stage spring 16 is arranged on one side of the sliding seat 15. The second-stage spring 16 is limited by a first-stage end cover 17 located at the end of the first-stage piston rod 2. The second-stage spring 16 is arranged between the sliding seat 15 and the first-stage end cover 17. A second-stage locking mechanism is provided on the second-stage piston assembly. The second-stage locking mechanism includes a second steel ball 18 and a second groove 19 that houses and is adapted to the second steel ball 18. The second steel ball 18 is arranged on the outer periphery of the second-stage piston 13 and is configured to be able to axially move along the inner surface of the first-stage piston rod 2. The second groove 19 is opened on a locking sleeve 20. The locking sleeve 20 is arranged on the inner wall of the first-stage piston rod 2. More specifically, a radial through hole (not penetrating the second-stage piston 13) is provided on the outer periphery of the second-stage piston 13. The second steel ball 18 is accommodated in the through hole and can radially move relative to the through hole.

[0037] ​A secondary piston rod 14 is axially provided with a secondary oil passage 141 along its interior. One end of the secondary piston rod 14 away from the secondary piston 13 is connected to an upper support ear 21. An oil hole 22 for the secondary rod chamber communicating with the secondary oil passage 141 is arranged on the upper support ear 21, and the oil hole 22 for the secondary rod chamber communicates with the secondary oil passage 141. One end of the outer cylinder 1 away from the upper support ear 21 is connected to a lower support ear 23. An oil port 24 for the rodless chamber is opened on the lower support ear 23. An oil port 25 for the primary rod chamber is opened at one end of the outer cylinder 1 away from the lower support ear 23. The cavity formed by the primary piston rod 2 and the outer cylinder 1 communicates with the oil port 25 for the primary rod chamber. A transition oil passage 26 is axially arranged along the interior of the connecting column 3.

[0038] Locking process of the two-stage locking mechanism: When oil enters through the oil port 24 for the rodless chamber, the oil fluid pushes the connecting column 3 and the primary piston 5 to move axially, driving the primary piston rod 2 to extend first. The first steel ball 10 moves along the outer surface of the primary piston rod 2 in the direction opposite to the movement direction of the primary piston rod 2. When the primary piston rod 2 is about to extend to the end of the outer cylinder 1, the guide sleeve 12 and the first steel ball 10 abut against the gland 4 and push the gland 4 to compress the primary first spring 6 to the left. When moving a certain distance further, when the first steel ball 10 reaches the position of the first groove 11 on the connecting column 3, the gland 4 moves to the right under the action of the primary first spring 6 and presses the first steel ball 10 into the first groove 11, achieving primary mechanical locking; The oil fluid enters the secondary piston assembly through the transition oil passage 26 on the connecting column 3, pushing the secondary piston rod 14 to extend. The second steel ball 18 moves to the right together with the secondary piston 13. When the secondary piston 13 is about to move to the end of the primary piston rod 2, the secondary piston 13 and the second steel ball 18 abut against the sliding seat 15 and continue to move to the right against the elastic force of the secondary spring 16. When the second steel ball 18 falls into the second groove 19 of the locking sleeve 20, immediately the sliding seat 15 moves to the left under the restoring force of the secondary spring 16, locking the second steel ball 18 in the second groove 19, achieving two-stage mechanical locking;

[0039] The unlocking process of the two-stage locking mechanism: oil enters the oil port 25 of the first-stage rod chamber. Under the action of the oil, the first-stage piston 5 is pushed to move leftward. The first-stage piston 5 compresses the first-stage second spring 7. There is a wire retaining ring 8 between the pressure cover 4 and the first-stage piston 5. The wire retaining ring 8 ensures that the first-stage piston 5 drives the pressure cover 4 to move leftward together until the first steel ball 10 is not constrained by the pressure cover 4. The first steel ball 10 is separated from the first groove 11, and the locking state of the first-stage mechanical lock is released. The first-stage piston rod 2 can be retracted; oil enters the oil hole 22 of the second-stage rod chamber. The oil passes through After the secondary oil passage 141 enters the oil path in the secondary piston 13, it flows out from the oil port and enters the secondary piston assembly cavity. Under the action of the oil, the sliding seat 15 is pushed to move in the direction of the upper ear 21. The sliding seat 15 compresses the secondary spring 16. At the same time, the secondary piston 13 moves in the direction of the lower ear 23 until the second steel ball 18 is disengaged from the second groove 19, and the locking state of the secondary mechanical lock is released. The secondary piston rod 14 can be retracted. This form can ensure that the unlocking process does not interfere with each other and does not affect each other, and effectively ensures the sequence of retraction.

[0040] The position detection mechanism includes a displacement sensor 27 and a telescopic rod assembly. The displacement sensor 27 is connected to a first connecting plate 35. The first connecting plate 35 is fixed to the outer cylinder 1. A protective cover 36 is arranged between the displacement sensor 27 and the telescopic rod assembly. The protective cover 36 can prevent dust from entering the telescopic rod assembly through the connection between the displacement sensor 27 and the telescopic rod assembly, thereby affecting the movement effect of the telescopic rod assembly. The telescopic rod assembly includes a second telescopic rod assembly and a first telescopic rod assembly that are nested inside and outside. The first telescopic rod assembly includes a first telescopic rod 28, a first piston 29 and an end cover 30. The first piston 29 is connected to one end of the first telescopic rod 28, and the end cover 30 is arranged at the other end of the first telescopic rod 28. The second telescopic rod assembly includes a second telescopic rod 31 and a second piston 32 connected to one end of the second telescopic rod 31. The output end of the displacement sensor 27 has a lock (not shown in the figure). The lock is connected to the second piston 32 through a pin 37. The other end of the second telescopic rod 31 is connected to the upper lug 21 through a second connecting plate 33. The second connecting plate 33 is L-shaped, and the end of the vertical section of the L-shaped second connecting plate 33 is connected to the end of the second telescopic rod 31 through a tightening nut 34 .

[0041] Movement process of the position detection mechanism: when the upper support ear 21 moves, the second connecting plate 33 drives the second telescopic rod 31 to move, and the pull rope 271 of the displacement sensor 27 is pulled out accordingly. When the second telescopic rod 31 extends to the end of the first telescopic rod 28, the second piston 32 contacts the end cover 30, and the first telescopic rod 28 is pulled outward under the action of force, and the pull rope 271 continues to move. Therefore, the detection of any position in the full stroke can be satisfied as long as the total displacement length of the first telescopic rod 28 and the second telescopic rod 31 exceeds the total stroke of the secondary oil cylinder.

[0042] Based on the above inspiration from the ideal embodiments of the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A two-stage mechanical locking oil cylinder with position detection, comprising an outer cylinder barrel (1), a primary piston assembly and a secondary piston assembly arranged in the outer cylinder barrel (1), the primary piston assembly being provided with a primary locking mechanism, characterized in that: The secondary piston assembly is provided with a secondary locking mechanism, the secondary locking mechanism comprising a second steel ball (18) and a second groove (19) carrying the second steel ball (18) and matching the second steel ball (18), the second steel ball (18) being arranged on the outer peripheral edge of the secondary piston (13) of the secondary piston assembly and being configured to be able to move axially along the inner surface of the primary piston rod (2) of the primary piston assembly, the second groove (19) being formed on a locking sleeve (20), and the locking sleeve (20) being arranged on the inner wall of the primary piston rod (2); The outer cylinder (1) is provided with a position detection mechanism outside, the position detection mechanism comprising a displacement sensor (27) and a telescopic rod assembly, the telescopic rod assembly comprising a second telescopic rod assembly and a first telescopic rod assembly which are nested inside and outside, the output end of the displacement sensor (27) being connected to a second piston (32) of the second telescopic rod assembly, and the extended end of the second telescopic assembly being connected to the extended end of the secondary piston assembly.

2. The two-stage mechanical locking cylinder with position detection according to claim 1 is characterized in that: The secondary piston assembly comprises a secondary piston (13), a secondary piston rod (14), a sliding seat (15) and a secondary spring (16); the secondary piston (13) is connected to one end of the secondary piston rod (14); the sliding seat (15) is arranged on the outer periphery of the secondary piston rod (14); a secondary spring (16) is arranged on one side of the sliding seat (15); the secondary spring (16) is limited by a primary end cover (17) located at the end of the primary piston rod (2); the secondary spring (16) is arranged between the sliding seat (15) and the primary end cover (17); a radial through hole is arranged along the outer periphery of the secondary piston (13); a second steel ball (18) is accommodated in the through hole and can move radially relative to the through hole.

3. The two-stage mechanical locking cylinder with position detection according to claim 2 is characterized in that: A secondary oil passage (141) is axially provided in the secondary piston rod (14); an end of the secondary piston rod (14) away from the secondary piston (13) is connected to an upper support ear (21); a secondary rod chamber oil hole (22) communicating with the secondary oil passage (141) is provided on the upper support ear (21); and the secondary rod chamber oil hole (22) is in communication with the secondary oil passage (141).

4. The two-stage mechanical locking cylinder with position detection according to claim 3 is characterized in that: The second telescopic rod assembly comprises a second telescopic rod (31) and a second piston (32) connected to one end of the second telescopic rod (31); the output end of the displacement sensor (27) has a lock, the lock is connected to the second piston (32) via a pin (37); the other end of the second telescopic rod (31) is connected to the upper support ear (21) via a second connecting plate (33).

5. The two-stage mechanical locking cylinder with position detection according to claim 4 is characterized in that: The second connecting plate (33) is L-shaped, and the end of the vertical section of the L-shaped second connecting plate (33) is connected to the end of the second telescopic rod (31) via a tightening nut (34).

6. The two-stage mechanical locking cylinder with position detection according to claim 1 is characterized in that: The displacement sensor (27) is connected to a first connecting plate (35), the first connecting plate (35) is fixed to the outer cylinder (1), and a protective cover (36) is provided between the displacement sensor (27) and the telescopic rod assembly.

7. The two-stage mechanical locking cylinder with position detection according to claim 1 is characterized in that: The first telescopic rod assembly comprises a first telescopic rod (28), a first piston (29) and an end cover (30), wherein the first piston (29) is connected to one end of the first telescopic rod (28), and the end cover (30) is arranged at the other end of the first telescopic rod (28).

8. The two-stage mechanical locking cylinder with position detection according to claim 1 is characterized in that: The primary piston assembly comprises a primary piston rod (2), a connecting column (3), a pressure cover (4), a primary piston (5), a primary first spring (6) and a primary second spring (7). The connecting column (3) is fixed to one end of the primary piston rod (2). The primary piston (5) and the pressure cover (4) are arranged on the outer circumference of the connecting column (3). A wire retaining ring (8) is arranged between the primary piston (5) and the pressure cover (4). The pressure cover (4) is limited by a raised portion of the connecting column (3) and a primary first spring (6) is arranged between the primary piston (5). The other end of the primary piston (5) is provided with a primary second spring (7). The primary second spring (7) is connected to a nut (9). The nut (9) is sleeved on one end of the connecting column (3) away from the pressure cover (4).

9. The two-stage mechanical locking cylinder with position detection according to claim 8 is characterized in that: One end of the outer cylinder barrel (1) is connected to the lower support ear (23), and a rodless chamber oil port (24) is provided on the lower support ear (23). A first-level rod chamber oil port (25) is provided at one end of the outer cylinder barrel (1) away from the lower support ear (23). The cavity enclosed by the first-level piston rod (2) and the cylinder barrel (1) is connected to the first-level rod chamber oil port (25), and a transition oil passage (26) is provided in the connecting column (3) along the axial direction.

10. The two-stage mechanical locking cylinder with position detection according to claim 9, characterized in that: The primary locking mechanism comprises a first steel ball (10) and a first groove (11) that carries the first steel ball (10) and is matched with the first steel ball (10); the first steel ball (10) is arranged on a guide sleeve (12) and is configured to be able to move axially along the outer surface of the primary piston rod (2); the guide sleeve (12) is arranged on the inner wall of the outer cylinder (1); the first groove (11) is opened on the outer periphery of the connecting column (3); the guide sleeve (12) is provided with a radial through hole, and the first steel ball (10) is accommodated and arranged in the through hole and can move radially relative to the through hole.

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