Hydraulic oil cylinder structure for engineering machinery

Abstract

The utility model discloses a hydraulic oil cylinder structure for engineering machinery, which comprises a cylinder body, a piston and a piston rod, the outer wall of the cylinder body is connected with a sliding piece in a sliding manner, one end of the sliding piece is fixed on the piston rod to realize synchronous sliding of the sliding piece and the piston rod, and a lug block corresponding to a guide rod is fixed on the side wall of the sliding piece. A plurality of guide rods are axially arrayed on the outer wall of the cylinder body, one end of each guide rod is fixed to the end, away from the extending end of the piston rod, of the cylinder body, and the other end of each guide rod penetrates through the corresponding lug block and is fixedly connected with a limiting block. When the lug block abuts against the limiting block in a contact mode, the sliding stroke of the sliding piece on the cylinder body is limited under the cooperation of the lug block and the limiting block, and the situation that the sealing performance and the stability of the hydraulic oil cylinder are affected due to the fact that the matching precision between the piston rod and the sealing piece is reduced due to the fact that the piston rod extends too long is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery equipment, in particular to a hydraulic oil cylinder structure for engineering machinery. Background Art

[0002] In practical applications, the piston rod often encounters some problems during the extension process.

[0003] If the piston rod is extended, a series of problems may occur if its stroke cannot be effectively controlled. For example, if the piston rod is extended too long, the extended telescopic rod is prone to deflection, making it difficult to maintain coaxial state with the cylinder body, and reducing the matching accuracy between it and the seal, thus affecting the sealing performance of the entire system, causing leakage of the hydraulic cylinder or other performance problems.

[0004] Secondly, the piston rod is also susceptible to external environmental contamination during the extension process. For example, when the piston rod is exposed to the air, impurities such as dust and moisture in the air may adhere to the surface of the piston rod, forming a layer of dirt, causing the piston rod to bring contaminants into the cylinder during the retraction process, aggravating the degree of contamination. Therefore, a hydraulic cylinder structure for construction machinery is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a hydraulic cylinder structure for engineering machinery to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hydraulic oil cylinder structure for engineering machinery, comprising a cylinder body, a piston and a piston rod, the cylinder body is slidably connected with a piston, the piston is connected with a piston rod, one end of the piston rod extends out of the cylinder body, a sliding member is slidably connected with the outer wall of the cylinder body, and one end of the sliding member is fixed on the piston rod to achieve synchronous sliding of the sliding member and the piston rod, the sliding member is fixed at a position close to the end of the piston rod to ensure that the piston rod can be retracted into the cylinder body, and an ear block corresponding to the guide rod is fixed on the side wall of the sliding member;

[0007] There are multiple guide rods arranged in an axial array on the outer wall of the cylinder body, the center line of each guide rod is parallel to the center line of the cylinder body, and there is a spacing between the guide rod and the cylinder body so that the sliding part can slide on the outer wall of the cylinder body, one end of the guide rod is fixed to the end of the cylinder body away from the protruding end of the piston rod, and the other end of the guide rod passes through the ear block and is fixedly connected to the limit block.

[0008] Preferably, an external thread is provided on the outer wall of the guide rod, and the limit block is meshedly connected to the external thread of the guide rod. The limit block can be slid along the guide rod by rotating the limit block, and then the position of the limit block on the guide rod is adjusted to adjust the maximum sliding stroke of the piston rod in the cylinder body.

[0009] Preferably, the sliding member is in a cylindrical structure, the sliding member is slidably sleeved on the cylinder body, and one end of the sliding member is fixedly sleeved on the piston rod. The sliding member can cover the protruding part of the piston rod to separate the piston rod from the outside, effectively preventing impurities from adhering to the surface of the piston rod.

[0010] Preferably, a plurality of ribs are axially arranged on the outer wall of the cylinder body, a groove is opened on the inner wall of the sliding member, the ribs are slidably connected inside the grooves, and the sliding cooperation between the ribs and the grooves provides a guiding effect for the sliding member, ensuring the stability of the sliding member during axial movement.

[0011] Preferably, the convex rib is provided with a first oil port and a second oil port, and the first oil port and the second oil port are respectively connected to the rod chamber and the rodless chamber of the cylinder body.

[0012] Preferably, the tail of the cylinder body and the outer end of the piston rod are both fixed with connecting pieces.

[0013] Preferably, a sealing ring is provided between the cylinder body and the piston rod.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model uses the sliding member and the piston rod to slide synchronously. During the sliding process of the sliding member, the ear block on the sliding member slides on the guide rod. When the ear block contacts and abuts against the limit block, the ear block and the limit block cooperate to limit the sliding stroke of the sliding member on the cylinder body, thereby preventing the piston rod from extending too long, resulting in a reduction in the matching accuracy between the piston rod and the seal, thereby affecting the sealing performance and the stability of the hydraulic cylinder;

[0016] 2. When the piston rod of the utility model is extended, the piston rod slides with the sliding member, and the sliding member covers the extended portion of the piston rod, which can separate the piston rod from the outside and effectively prevent impurities from adhering to the surface of the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a cross-sectional view of the overall structure of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the cylinder body, sliding member, guide rod and limit block of the utility model;

[0020] Figure 4 It is a cross-sectional exploded view of the cylinder body, sliding member, guide rod and limit block of the utility model.

[0021] In the figure: 1, cylinder body, 2, piston, 3, piston rod, 4, sliding part, 401, ear block, 5, guide rod, 6, limit block, 7, rib, 8, groove, 9, first oil port, 10, second oil port, 11, connecting part, 12, sealing ring. DETAILED DESCRIPTION

[0022] 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.

[0023] See also Figure 1-4 The utility model provides a technical solution: a hydraulic cylinder structure for engineering machinery, including a cylinder body 1, a piston 2 and a piston rod 3, the cylinder body 1 is slidably connected with the piston 2, the piston 2 is connected with the piston rod 3, one end of the piston rod 3 extends out of the cylinder body 1, a sliding member 4 is slidably connected to the outer wall of the cylinder body 1, and one end of the sliding member 4 is fixed on the piston rod 3 to achieve synchronous sliding of the sliding member 4 and the piston rod 3, the sliding member 4 is fixed at a position close to the end of the piston rod 3 to ensure that the piston rod 3 can be retracted into the cylinder body 1, and an ear block 401 corresponding to the guide rod 5 is fixed on the side wall of the sliding member 4;

[0024] A plurality of guide rods 5 are arranged in an axial array on the outer wall of the cylinder body 1, the center line of each guide rod 5 is parallel to the center line of the cylinder body 1, and there is a distance between the guide rod 5 and the cylinder body 1 so that the sliding member 4 can slide on the outer wall of the cylinder body 1, one end of the guide rod 5 is fixed to the end of the cylinder body 1 away from the protruding end of the piston rod 3, and the other end of the guide rod 5 passes through the ear block 401 and is fixedly connected to the limit block 6;

[0025] Working process: When the piston 2 and the piston rod 3 slide in the cylinder body 1, causing the piston rod 3 to extend from the cylinder body 1, the sliding member 4 can slide synchronously with the piston rod 3. During the sliding process of the sliding member 4, the ear block 401 on the sliding member 4 slides on the guide rod 5. When the ear block 401 contacts and abuts against the limit block 6, the ear block 401 cooperates with the limit block 6 to limit the sliding stroke of the sliding member 4 on the cylinder body 1, thereby preventing the piston rod 3 from extending too long, resulting in a reduction in the matching accuracy between it and the seal, thereby affecting the sealing performance and the stability of the hydraulic cylinder.

[0026] like Figure 1 , Figure 3As shown, in order to be able to adjust the position of the limit block 6 on the guide rod 5 so as to adjust the maximum sliding stroke of the piston rod 3 in the cylinder body 1, specifically, an external thread is provided on the outer wall of the guide rod 5, and the limit block 6 is meshedly connected to the external thread of the guide rod 5. By rotating the limit block 6, the limit block 6 can slide along the guide rod 5, and then the position of the limit block 6 on the guide rod 5 is adjusted, and then the maximum sliding stroke of the piston rod 3 in the cylinder body 1 is adjusted.

[0027] like Figure 3 , Figure 4 As shown, in order to prevent dust from being applied to the extended piston rod 3 and to prevent foreign matter from adhering to the surface of the piston rod 3, specifically, the sliding member 4 is in a tubular structure, the sliding member 4 is slidably sleeved on the cylinder body 1, and one end of the sliding member 4 is fixedly sleeved on the piston rod 3. When the piston rod 3 is extended, the piston rod 3 slides with the sliding member 4. At this time, the sliding member 4 covers the extended portion of the piston rod 3, which can separate the piston rod 3 from the outside, and effectively prevent foreign matter from adhering to the surface of the piston rod 3.

[0028] like Figure 4 As shown, in order to prevent the sliding member 4 from circumferentially moving on the cylinder body 1, specifically, a plurality of ribs 7 are axially arranged on the outer wall of the cylinder body 1, and a groove 8 is opened on the inner wall of the sliding member 4. The ribs 7 are slidably connected inside the grooves 8. The sliding fit between the ribs 7 and the grooves 8 provides a guiding effect for the sliding member 4, thereby ensuring the stability of the sliding member 4 during axial movement.

[0029] like Figure 1 , Figure 2 As shown, in order to drive the piston 2 and the piston rod 3 to slide in the cylinder body 1, specifically, the convex rib 7 is provided with a first oil port 9 and a second oil port 10, and the first oil port 9 and the second oil port 10 are respectively connected to the rod chamber and the rodless chamber of the cylinder body 1. In this way, the oil supply pipe and the oil return pipe can be conveniently connected to the first oil port 9 and the second oil port 10 on the convex rib 7, respectively, so as to realize the oil supply and oil discharge to the rod chamber and the rodless chamber.

[0030] like Figure 1 As shown, in order to facilitate the installation and connection of the cylinder body 1 and the piston rod 3, specifically, the tail of the cylinder body 1 and the outer end of the piston rod 3 are fixed with a connecting piece 11;

[0031] At the tail end of the cylinder body 1, the connector 11 can be fixed by means of threads, flanges or other fastening methods, so that the cylinder body 1 can be conveniently connected to other components or systems. Similarly, at the outer end of the piston rod 3, the connector 11 also adopts a similar fastening method to ensure that the piston rod 3 can be stably connected to the drive device or working mechanism.

[0032] like Figure 2As shown, in order to improve the sealing performance of the connection between the cylinder body 1 and the piston rod 3 , specifically, a sealing ring 12 is provided between the cylinder body 1 and the piston rod 3 .

[0033] 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 hydraulic cylinder structure for engineering machinery, comprising a cylinder body (1), a piston (2) and a piston rod (3), characterized in that: A sliding member (4) is slidably connected to the outer wall of the cylinder body (1), and one end of the sliding member (4) is fixed to the piston rod (3) to achieve synchronous sliding of the sliding member (4) and the piston rod (3), and an ear block (401) corresponding to the guide rod (5) is fixed to the side wall of the sliding member (4); A plurality of guide rods (5) are arranged in an axial array on the outer wall of the cylinder body (1), the center line of each guide rod (5) being parallel to the center line of the cylinder body (1), one end of the guide rod (5) being fixed to an end of the cylinder body (1) away from the protruding end of the piston rod (3), and the other end of the guide rod (5) passing through the ear block (401) and being fixedly connected to the limit block (6).

2. A hydraulic cylinder structure for construction machinery according to claim 1, characterized in that: An external thread is provided on the outer wall of the guide rod (5), and the limit block (6) is meshedly connected to the external thread of the guide rod (5).

3. The hydraulic cylinder structure for construction machinery according to claim 1, characterized in that: The sliding member (4) is in a cylindrical structure, and is slidably sleeved on the cylinder body (1), and one end of the sliding member (4) is fixedly sleeved on the piston rod (3).

4. The hydraulic cylinder structure for construction machinery according to claim 1, characterized in that: A plurality of convex ribs (7) are axially arranged on the outer wall of the cylinder body (1), a groove (8) is provided on the inner wall of the sliding member (4), and the convex rib (7) is slidably connected inside the groove (8).

5. A hydraulic cylinder structure for construction machinery according to claim 4, characterized in that: The convex rib (7) is provided with a first oil port (9) and a second oil port (10), and the first oil port (9) and the second oil port (10) are respectively connected to the rod chamber and the rodless chamber of the cylinder body (1).

6. The hydraulic cylinder structure for construction machinery according to claim 1, characterized in that: The tail of the cylinder body (1) and the outer end of the piston rod (3) are both fixed with a connecting piece (11).

7. The hydraulic cylinder structure for construction machinery according to claim 1, characterized in that: A sealing ring (12) is provided between the cylinder body (1) and the piston rod (3).

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