Double self-locking hydraulic cylinder

Abstract

The utility model provides a double self-locking hydraulic cylinder, which belongs to the technical field of hydraulic cylinders and comprises a cylinder body and a piston rod, the top of the cylinder body is fixedly connected with an annular lock cover sleeved outside the piston rod, the outer wall of the annular lock cover is fixedly connected with a support arranged at the top of the cylinder body, and an annular clamping seat is rotatably arranged in an inner cavity of the annular lock cover. A self-locking piece is fixedly installed on the circumferential inner wall of the annular clamping base, clamping grooves corresponding to the self-locking piece are evenly formed in the outer wall of the piston rod in the longitudinal direction, and a rotary clamping assembly for driving the annular clamping base to rotate is arranged in an inner cavity of the support. The annular clamping base is driven by the rotary clamping assembly to rotate in the circumferential direction of the inner cavity of the annular lock cover, so that the annular clamping base drives the self-locking piece to be clamped into the clamping groove in the corresponding position, the stability of the position where the piston rod is located after extension is guaranteed, and the position change is avoided by locking the position of the piston rod through the two sides.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a double self-locking hydraulic cylinder. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When it is used to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines. During operation, once the single lock structure is unlocked, the stability of the hydraulic cylinder will be affected.

[0003] A double self-locking hydraulic cylinder is disclosed in the related technology (publication number: CN218971554U), and the disclosed technical solution is: static locking is performed by the limiting rod on the left, and dynamic unlocking is performed by the acting block on the right. When unlocking is required, the pull ring is pulled to make the right end of the pull ring disengage from the I-shaped limiting groove. At the same time, the pull ring drives the limiting rod to release the restriction on the slot on the piston rod. Then the pull ring is rotated so that the right end of the pull ring is vertically pressed against the notch of the I-shaped limiting groove for restriction. When the hydraulic cylinder drives the piston rod, as the piston rod moves, the acting block is pushed out of the arc groove to complete the second unlocking, effectively preventing the staff from accidentally unlocking and affecting the operation of the hydraulic cylinder.

[0004] In the above-mentioned disclosed technical solution, the following problems were found in the related technology: during the power output of the hydraulic cylinder, the extended length of the piston rod is adapted to the working environment, so there is uncertainty in the length of the piston rod protruding from the cylinder body. For this reason, a multi-point locking method is required when locking the hydraulic cylinder to ensure the stability of the hydraulic cylinder working process. For this reason, we propose a new double self-locking hydraulic cylinder.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background technology section of this application, and therefore may include prior art information that does not constitute known to ordinary technicians in the field. Utility Model Content

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology. In order to solve the self-locking problem of the hydraulic cylinder in the prior art, the utility model provides a double self-locking hydraulic cylinder, which adopts a pre-locking structure combined with a double locking structure to ensure the stable operation of the hydraulic cylinder. The specific technical solution is as follows:

[0007] A double self-locking hydraulic cylinder comprises a cylinder body and a piston rod, the top of the cylinder body is fixedly connected to an annular lock cover sleeved on the outside of the piston rod, the outer wall of the annular lock cover is fixedly connected to a support arranged on the top of the cylinder body, the inner cavity of the annular lock cover is rotatably provided with an annular clamping seat, the circumferential inner wall of the annular clamping seat is fixedly installed with a self-locking piece, the outer wall of the piston rod is longitudinally uniformly provided with clamping grooves corresponding to the self-locking piece, and the inner cavity of the support is provided with a rotating clamping assembly that drives the annular clamping seat to rotate.

[0008] In the above technical solution, the rotating clamping assembly includes a driving gear rotatably arranged in the inner cavity of the support, a gear ring is arranged at the bottom of the annular clamping seat, a through groove is opened on the outer wall of the annular lock cover, and the driving gear passes through the through groove and meshes with the gear ring.

[0009] An annular sliding seat is circumferentially arranged on the outer wall of the annular clamping seat, an annular guide groove is circumferentially opened on the inner wall of the annular lock cover, and the annular sliding seat is slidably arranged inside the annular guide groove.

[0010] A positioning contact is fixedly connected to the inner wall of the annular card seat, and a movable contact corresponding to the positioning contact is arranged on the outer wall of the annular card seat. The positioning contact is connected to the power supply through a wire. An indicator is arranged on the top of the support, and the indicator is electrically connected to the movable contact through a wire.

[0011] A locking cover is provided at the top of the outer wall of the cylinder body, a self-locking bayonet located in the inner cavity of the locking cover is opened on the outer wall of the cylinder body, a movable rod extending to the inner cavity of the self-locking bayonet is slidably provided at the bottom of the inner wall of the locking cover, a pre-locking piece is provided at the end of the movable rod located in the inner cavity of the self-locking bayonet, pre-locking grooves corresponding to the pre-locking piece are evenly opened in the longitudinal direction on the outer wall of the piston rod, and an end of the movable rod away from the pre-locking groove is connected to the inner wall of the locking cover by an elastic piece.

[0012] The slot is formed by opening in the circumferential direction.

[0013] A sealing plug is fixedly connected to the bottom of the piston rod, and the position of the self-locking bayonet is higher than the position of the sealing plug when the piston rod is fully extended out of the cylinder body.

[0014] The bottom of the cylinder body and the top of the piston rod are both provided with mounting parts.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the double self-locking hydraulic cylinder:

[0016] 1. When the piston rod is extended to the corresponding position, the annular clamping seat is driven to rotate circumferentially in the inner cavity of the annular lock cover by rotating the clamping assembly, so that the annular clamping seat drives the self-locking part to be clamped into the clamping groove at the corresponding position, thereby ensuring the stability of the position of the piston rod after extension. By locking the position of the piston rod on both sides, position changes are avoided, thereby ensuring the working effect of the hydraulic cylinder.

[0017] Second, multiple card slots from top to bottom form multiple card points, so that the piston rod can be locked at different extension positions, thereby improving the adaptability of the hydraulic cylinder's working environment and ensuring the stability of the hydraulic cylinder during use.

[0018] Third, the annular slide seat slides in close contact with the inner wall of the annular guide groove, thereby ensuring the stability of the annular clamping seat during rotation, avoiding the position deviation of the self-locking member, and further ensuring the accuracy of the engagement between the self-locking member and the clamping groove.

[0019] 4. After the self-locking part rotates to the inside of the slot along with the annular clamping seat, the movable contact contacts with the positioning contact along with the annular clamping seat. After the positioning contact contacts the movable contact, the indicator is connected to the power supply, thereby prompting the relevant personnel, making it easier for the relevant personnel to operate and ensuring the accuracy of the self-locking position of the hydraulic cylinder.

[0020] 5. During the extension of the piston rod, the elastic deformation of the elastic part allows the pre-locking part to slide through the pre-locking groove on the outer wall of the piston rod in sequence, so that the piston rod can be locked at each point. Then, the stability of the piston rod position is further improved through the clamping cooperation between the self-locking part and the clamping groove, and the stability of the hydraulic cylinder during operation is ensured by double self-locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of a double self-locking hydraulic cylinder of the utility model;

[0022] Figure 2 This is a structural cross-sectional view of a double self-locking hydraulic cylinder of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the piston rod and the annular lock cover of the utility model;

[0024] Figure 4 This is a cross-sectional view of the structure of the annular lock cover of the utility model Figure Ⅰ ;

[0025] Figure 5 This is a cross-sectional view of the structure of the annular lock cover of the utility model Figure II ;

[0026] Figure 6 for Figure 2 A local enlarged view of point A;

[0027] in, Figures 1 to 6 The corresponding relationship between the figure numbers and the component names is: 1-cylinder body, 2-piston rod, 3-annular lock cover, 4-locking cover, 5-support, 6-self-locking bayonet, 7-pre-locking member, 8-movable rod, 9-elastic member, 10-pre-locking groove, 11-slot, 12-connecting seat, 13-support seat, 14-sealing plug, 15-indicator, 16-positioning contact, 17-movable contact, 18-annular guide groove, 19-gear ring, 20-annular clamping seat, 21-self-locking member, 22-through groove, 23-annular slide seat, 24-driving gear. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The following is a combination of specific implementation cases and attached Figure 1 -Attached Figure 6 The present invention is further described below, but the present invention is not limited to these embodiments.

[0030] A double self-locking hydraulic cylinder includes a cylinder body 1 and a piston rod 2. The two important components of the hydraulic cylinder are the cylinder body 1 and the piston rod 2. The piston rod 2 slides in the cylinder body 1 through hydraulic power, and the power output is performed through the expansion and contraction changes of the piston rod 2 when it protrudes out of the cylinder body 1. The top of the cylinder body 1 is fixedly connected with an annular lock cover 3 sleeved on the outside of the piston rod 2, and the outer wall of the annular lock cover 3 is fixedly connected with a support 5 arranged on the top of the cylinder body 1. The annular lock cover 3 is movably sleeved on the outside of the piston rod 2 through the through hole in the center, so that the piston rod 2 can be telescopically moved in the center of the annular lock cover 3. Supports 5 are fixedly installed on both sides of the outer wall of the annular lock cover 3, and the two supports 5 are symmetrically fixedly installed at the top edge of the cylinder body 1, and the inner cavity of the support 5 is connected with the inner cavity of the annular lock cover 3, and the annular lock cover 3 is fixed on the cylinder body 1 through the support 5.

[0031] The inner cavity of the annular lock cover 3 is rotatably provided with an annular holder 20, and the circumferential inner wall of the annular holder 20 is fixedly installed with a self-locking member 21. The circumferential shape of the annular holder 20 corresponds to the annular lock cover 3, so that the annular holder 20 rotates circumferentially in the inner cavity of the annular lock cover 3, and the self-locking members 21 are symmetrically fixedly installed on the inner walls on both sides of the annular holder 20, and multiple rectangular slots 11 are opened successively from top to bottom on the outer walls on the left and right sides of the piston rod 2, and the slots 11 are opened circumferentially. The shape of the slots 11 corresponds to the shape of the self-locking member 21, so that the self-locking member 21 is clamped inside the slots 11 after the annular holder 20 rotates. Multiple clamping points are formed by multiple slots 11 from top to bottom, so that the piston rod 2 can be locked at different extended positions. Thereby, the adaptability of the working environment of the hydraulic cylinder is improved, and the stability of the hydraulic cylinder when in use is ensured.

[0032] The outer wall of the piston rod 2 is uniformly provided with slots 11 corresponding to the self-locking member 21 in the longitudinal direction, and the inner cavity of the support 5 is provided with a rotating clamping assembly that drives the annular clamping seat 20 to rotate. When the hydraulic cylinder is in use, after the piston rod 2 is extended to the corresponding position, the annular clamping seat 20 is driven to rotate circumferentially in the inner cavity of the annular lock cover 3 by the rotating clamping assembly, so that the annular clamping seat 20 drives the self-locking member 21 to be clamped into the slot 11 at the corresponding position, thereby ensuring the stability of the position of the piston rod 2 after extension, and preventing the position change by locking the position of the piston rod 2 on both sides, thereby ensuring the working effect of the hydraulic cylinder.

[0033] The rotating clamping assembly includes a driving gear 24 rotatably arranged in the inner cavity of the support 5, a gear ring 19 is arranged at the bottom of the annular clamping seat 20, and a through slot 22 is provided on the outer wall of the annular lock cover 3. The driving gear 24 passes through the through slot 22 and meshes with the gear ring 19. The motor is fixedly installed in the inner cavity of the support 5, and the driving gear 24 is fixedly sleeved on the outside of the motor output shaft through the mounting hole provided in the center, so that the driving gear 24 rotates in the inner cavity of the annular lock cover 3. The gear ring 19 is fixedly fixed at the bottom of the annular clamping seat 20, and the driving gear 24 passes through the through slot 22 and meshes with the gear ring 19.

[0034] When the piston rod 2 is locked, the motor of the driving gear 24 is connected to a power source through a wire, so that the ring gear 19 meshing with the driving gear 24 drives the annular holder 20 to rotate, so that the self-locking member 21 on the annular holder 20 is engaged in the inside of the slot 11.

[0035] It is worth noting that an annular slide seat 23 is circumferentially arranged on the outer wall of the annular holder 20 , an annular guide groove 18 is circumferentially opened on the inner wall of the annular lock cover 3 , and the annular slide seat 23 is slidably arranged inside the annular guide groove 18 .

[0036] An annular guide groove 18 is formed on the inner wall of the annular lock cover 3, and an annular slide seat 23 is fixedly sleeved on the circumferential outer wall of the annular clamping seat 20, so that the annular slide seat 23 slides on the inner wall of the annular guide groove 18, thereby ensuring the stability of the rotation process of the annular clamping seat 20, avoiding the position deviation of the self-locking member 21, and further ensuring the accuracy of the engagement between the self-locking member 21 and the clamping groove 11.

[0037] In addition, a positioning contact 16 is fixedly connected to the inner wall of the annular card seat 20, and a movable contact 17 corresponding to the positioning contact 16 is arranged on the outer wall of the annular card seat 20, and the positioning contact 16 is connected to the power supply through a wire. The positioning contact 16 and the movable contact 17 are both metal conductors. When the movable contact 17 rotates with the annular card seat 20 to a position in contact with the positioning contact 16, the indicator 15 is connected to the power supply and works. The top of the support 5 is provided with an indicator 15, and the indicator 15 is electrically connected to the movable contact 17 through a wire.

[0038] When in use, the indicator 15 connected to the controller can be an indicator light or a speaker to prompt the self-locking function in time by contacting the positioning contact 16 and the movable contact 17. The annular card holder 20 is controlled to rotate forward and reverse within 180°, and the motor where the driving gear 24 is located has a forward and reverse adjustment function. The rotation range of the annular card holder 20 is adjusted by controlling the forward and reverse rotation of the driving gear 24 to avoid affecting the connecting wire of the movable contact 17.

[0039] After the self-locking member 21 rotates to the inside of the slot 11 along with the annular holder 20, the movable contact 17 contacts the positioning contact 16 along with the annular holder 20. After the positioning contact 16 contacts the movable contact 17, the indicator 15 is connected to the power supply, thereby providing a prompt to relevant personnel, facilitating their operation and ensuring the accuracy of the self-locking position of the hydraulic cylinder.

[0040] In addition, a lock cover 4 is provided on the top of the outer wall of the cylinder body 1, and a self-locking bayonet 6 is provided on the outer wall of the cylinder body 1 and is located in the inner cavity of the lock cover 4. Two self-locking bayonet 6 are symmetrically provided on both sides of the outer wall of the cylinder body 1 near the top, and the pre-locking member 7 extends to the inner cavity of the cylinder body 1 after passing through the self-locking bayonet 6. The pre-locking member 7 is conical, and the pre-locking groove 10 on the outer wall of the piston rod 2 is conical to match the pre-locking member 7.

[0041] A movable rod 8 extending to the inner cavity of the self-locking bayonet 6 is slidably provided at the bottom of the inner wall of the lock cover 4, and a pre-locking part 7 is provided at the end of the movable rod 8 located in the inner cavity of the self-locking bayonet 6. The outer wall of the piston rod 2 is longitudinally and evenly provided with pre-locking grooves 10 corresponding to the pre-locking part 7, and the end of the movable rod 8 away from the pre-locking groove 10 is connected to the inner wall of the lock cover 4 by an elastic part 9.

[0042] The stability of the piston rod 2 when it extends to each position is ensured by the pre-locking parts 7 on both sides. Each pre-locking groove 10 is located at the same height as each card groove 11. The elastic member 9 can be a compression spring, and a support seat 13 is fixedly installed at the bottom of the inner wall of the lock cover 4. The movable rod 8 passes through the inner cavity of the support seat 13, so that the movable rod 8 slides in the two support seats 13. One end of the movable rod 8 is fixedly connected to the pre-locking part 7, and the other end of the movable rod 8 is fixedly installed to the connecting seat 12. The two ends of the elastic member 9 are respectively fixed on the connecting seat 12 and the inner wall of the lock cover 4.

[0043] During the extension of the piston rod 2, the elastic deformation of the elastic member 9 allows the pre-locking member 7 to slide through the pre-locking groove 10 on the outer wall of the piston rod 2 in sequence, so that the piston rod 2 can be locked at each point. Thereafter, the stability of the position of the piston rod 2 is further improved through the clamping cooperation between the self-locking member 21 and the clamping groove 11, and the stability of the hydraulic cylinder during operation is ensured by double self-locking.

[0044] The slot 11 is formed by opening in the circumferential direction. Through the slot 11 opened in the circumferential direction, when the annular clamping seat 20 drives the self-locking member 21 to rotate and engage with the slot 11 on the piston rod 2, the self-locking member 21 is prevented from being interfered by the edge of the slot 11 during the rotation and engagement process, thereby ensuring the stability of the self-locking process of the hydraulic cylinder.

[0045] Furthermore, a sealing plug 14 is fixed to the bottom of the piston rod 2, and the position of the self-locking bayonet 6 is higher than the position of the sealing plug 14 when the piston rod 2 is fully extended out of the cylinder body 1, thereby ensuring the stability of the hydraulic cylinder power output process.

[0046] The bottom of the cylinder body 1 and the top of the piston rod 2 are both provided with mounting pieces. The mounting pieces at both ends make it more convenient to install the hydraulic cylinder.

[0047] The present embodiment is a double self-locking hydraulic cylinder, and its working principle is as follows: during the extension of the piston rod 2, the elastic member 9 is elastically deformed so that the pre-locking member 7 slides through the pre-locking groove 10 on the outer wall of the piston rod 2 in sequence, so that the piston rod 2 can be locked at each point.

[0048] Then, the motor of the driving gear 24 is connected to the power supply through the wire, so that the ring gear 19 meshing with the driving gear 24 drives the annular holder 20 to rotate, so that the self-locking member 21 on the annular holder 20 is engaged in the inside of the slot 11, thereby doubly locking the piston rod 2.

[0049] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0051] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double self-locking hydraulic cylinder, comprising a cylinder body (1) and a piston rod (2), characterized in that: The top of the cylinder body (1) is fixedly connected to an annular lock cover (3) sleeved on the outside of the piston rod (2); the outer wall of the annular lock cover (3) is fixedly connected to a support (5) arranged on the top of the cylinder body (1); the inner cavity of the annular lock cover (3) is rotatably provided with an annular clamping seat (20); a self-locking member (21) is fixedly installed on the circumferential inner wall of the annular clamping seat (20); the outer wall of the piston rod (2) is uniformly longitudinally provided with clamping grooves (11) corresponding to the self-locking member (21); and the inner cavity of the support (5) is provided with a rotating clamping assembly for driving the annular clamping seat (20) to rotate.

2. A double self-locking hydraulic cylinder according to claim 1, characterized in that: The rotary clamping assembly comprises a driving gear (24) rotatably arranged in the inner cavity of the support (5); a gear ring (19) is arranged at the bottom of the annular clamping seat (20); a through groove (22) is formed on the outer wall of the annular lock cover (3); and the driving gear (24) penetrates the through groove (22) and meshes with the gear ring (19).

3. A double self-locking hydraulic cylinder according to claim 1, characterized in that: An annular slide seat (23) is circumferentially arranged on the outer wall of the annular clamping seat (20), an annular guide groove (18) is circumferentially opened on the inner wall of the annular lock cover (3), and the annular slide seat (23) is slidably arranged inside the annular guide groove (18).

4. A double self-locking hydraulic cylinder according to claim 1, characterized in that: A positioning contact (16) is fixedly connected to the inner wall of the annular card seat (20), and a movable contact (17) corresponding to the positioning contact (16) is arranged on the outer wall of the annular card seat (20), and the positioning contact (16) is connected to a power supply through a wire. An indicator (15) is arranged on the top of the support (5), and the indicator (15) is electrically connected to the movable contact (17) through a wire.

5. A double self-locking hydraulic cylinder according to claim 1, characterized in that: A locking cover (4) is arranged at the top of the outer wall of the cylinder body (1); a self-locking bayonet (6) located in the inner cavity of the locking cover (4) is provided on the outer wall of the cylinder body (1); a movable rod (8) extending to the inner cavity of the self-locking bayonet (6) is slidably provided at the bottom of the inner wall of the locking cover (4); a pre-locking piece (7) is provided at the end of the movable rod (8) located in the inner cavity of the self-locking bayonet (6); a pre-locking groove (10) corresponding to the pre-locking piece (7) is uniformly provided on the outer wall of the piston rod (2) in the longitudinal direction; and an end of the movable rod (8) away from the pre-locking groove (10) is connected to the inner wall of the locking cover (4) via an elastic piece (9).

6. A double self-locking hydraulic cylinder according to claim 1, characterized in that: The clamping groove (11) is opened in the circumferential direction.

7. A double self-locking hydraulic cylinder according to claim 5, characterized in that: A sealing plug (14) is fixedly connected to the bottom of the piston rod (2), and the position of the self-locking bayonet (6) is higher than the position of the sealing plug (14) when the piston rod (2) is fully extended out of the cylinder body (1).

8. The double self-locking hydraulic cylinder according to claim 1, characterized in that: The bottom of the cylinder body (1) and the top of the piston rod (2) are both provided with mounting parts.

Images