Large hydraulic oil cylinder of crane

Abstract

The utility model relates to the field of hydraulic oil cylinders, in particular to a large hydraulic oil cylinder of a crane. The large hydraulic oil cylinder of the crane comprises a cylinder barrel, a cylinder cover is fixedly mounted at the end of the cylinder barrel, a piston rod slidably connected with the cylinder barrel is inserted into the cylinder barrel, a dust scraping mechanism is mounted on the cylinder cover and comprises a plurality of L-shaped mounting plates distributed around the cylinder cover, and a plurality of connecting mechanisms distributed around the cylinder cover are mounted below the cylinder cover. And the L-shaped mounting plate is fixedly mounted on the cylinder cover through a connecting mechanism. Dust and impurities on the outer wall of the piston rod are scraped off through the plastic arc-shaped scraping plate when the piston rod retracts, the dust-proof ring of the hydraulic oil cylinder can be prevented from being damaged due to the fact that the dust-proof ring directly makes contact with the impurities such as the dust for a long time, and therefore the service life of the dust-proof ring is effectively prolonged. Hydraulic oil cylinder faults and maintenance cost caused by premature damage of the dustproof ring are reduced; and the L-shaped mounting plate can shield the dustproof ring, so that the dustproof ring is prevented from being directly irradiated by ultraviolet rays and is protected.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinders, and in particular to a large hydraulic cylinder for cranes. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. In crane operations, large hydraulic cylinders are key components, and their operating status directly affects the crane's performance and safety.

[0003] Dust seals on hydraulic cylinders are used to protect the piston rod from dust, preventing it from entering the cylinder. However, these seals are typically made of rubber. Some cranes are exposed to direct sunlight for extended periods, causing the seals to age and become brittle. Excessive dust and impurities also accelerate the damage to the seals. Once the seals are worn, aged, or damaged, their sealing performance is significantly reduced, making them unable to effectively prevent impurities from entering the cylinder and further accelerating the damage to internal cylinder components.

[0004] Therefore, it is necessary to provide a new type of large hydraulic cylinder for cranes to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a large hydraulic cylinder for cranes that can protect the dustproof ring and has a long service life.

[0006] The large hydraulic cylinder for cranes provided by this utility model includes a cylinder barrel, a cylinder cover fixedly installed at the end of the cylinder barrel, a piston rod slidably connected thereto inserted in the cylinder barrel, a dust scraping mechanism installed on the cylinder cover, the dust scraping mechanism including several L-shaped mounting plates distributed around the cylinder cover, several connecting mechanisms distributed around the cylinder cover installed below the cylinder cover, and the L-shaped mounting plates fixedly installed on the cylinder cover through the connecting mechanisms, each L-shaped mounting plate is equipped with a sliding mechanism, and an arc-shaped plate is slidably connected to the upper side wall of the L-shaped mounting plate through the sliding mechanism, the arc-shaped plate is inclined along the piston rod axis, and a detachable plastic arc-shaped scraper is inserted into the arc-shaped plate.

[0007] Preferably, the connecting mechanism includes an L-shaped retaining plate, which is installed below the cylinder head. Both the L-shaped retaining plate and the L-shaped mounting plate are fixedly mounted with lugs and are locked to the cylinder head by locking bolts.

[0008] Preferably, a hoop groove is provided on the outer side wall of each of the L-shaped card plates, and the hoop grooves on the L-shaped card plates form an annular card groove structure, and a clamp is fixedly installed in the annular card groove structure.

[0009] Preferably, the sliding mechanism includes a sliding plate, which is slidably installed in and slidably connected to a sliding cavity in an L-shaped mounting plate. An arc-shaped sealing plate for sealing the opening is installed in the arc-shaped outer wall of the L-shaped mounting plate. A spring is fixedly installed on one side wall of the arc-shaped sealing plate inside the sliding cavity, and the other end of the spring abuts against the inner wall of the sliding plate. A strip-shaped opening communicating with the sliding cavity is opened on the upper side wall of the L-shaped mounting plate. The sliding plate is fixedly connected to the arc-shaped plate through a connecting rod passing through the strip-shaped opening.

[0010] Preferably, the arc-shaped sealing plate is equipped with fixing screws, and the arc-shaped sealing plate is fixed to the L-shaped mounting plate by fixing screws.

[0011] Preferably, the distance between the connecting rod and the innermost inner wall of the strip opening is less than the minimum distance between the arc plate and the piston rod.

[0012] Preferably, the upper end of the arc-shaped plate is provided with an arc-shaped groove with an L-shaped cross section, and a plastic arc-shaped scraper with the same L-shaped cross section is inserted into the arc-shaped groove.

[0013] Preferably, the ends of two adjacent plastic arc-shaped scrapers are fitted together.

[0014] Compared with related technologies, the large hydraulic cylinder for cranes provided by this utility model has the following beneficial effects:

[0015] 1. This utility model uses a plastic arc-shaped scraper to remove dust and impurities from the outer wall of the piston rod during retraction. This prevents the dust seal of the hydraulic cylinder from being damaged by prolonged direct contact with dust and other impurities, thus effectively extending the service life of the dust seal and reducing hydraulic cylinder failures and maintenance costs caused by premature damage to the dust seal. At the same time, the multiple L-shaped mounting plates arranged around the cylinder can shield the exposed dust seal of the hydraulic cylinder, preventing direct ultraviolet radiation and protecting the dust seal.

[0016] 2. The sliding mechanism in this utility model ensures that the upper end of the plastic arc-shaped scraper is always in close contact with the outer wall of the piston rod. The plastic arc-shaped scraper will experience frictional wear, but the sliding mechanism ensures that the end of the plastic arc-shaped scraper is always in close contact with the outer wall of the piston rod for dust and impurity removal. Attached Figure Description

[0017] Figure 1 A schematic diagram of a preferred embodiment of the large hydraulic cylinder for cranes provided by this utility model;

[0018] Figure 2 for Figure 1 The diagram shown is a structural schematic of the dust scraping mechanism.

[0019] Figure 3 for Figure 2The diagram shows the structure of the sliding mechanism.

[0020] Figure 4 for Figure 1 The diagram shows the structure of the connecting mechanism.

[0021] Figure 5 for Figure 1 The diagram shows the structure of the arc-shaped plate.

[0022] The following are the labels in the diagram: 1. Cylinder; 11. Cylinder head; 2. Piston rod; 3. Dust scraping mechanism; 31. L-shaped mounting plate; 32. Arc-shaped plate; 321. Arc-shaped groove; 33. Plastic arc-shaped scraper; 4. Connecting mechanism; 41. L-shaped clamping plate; 411. Hoop groove; 42. Ear plate; 43. Locking bolt; 5. Sliding mechanism; 51. Sliding cavity; 52. Slide plate; 53. Spring; 54. Strip opening; 55. Connecting rod; 56. Arc-shaped sealing plate; 561. Fixing screw; 6. Clamp. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0025] Please see Figures 1 to 5 This utility model provides a large hydraulic cylinder for a crane. The large hydraulic cylinder for a crane includes a cylinder barrel 1, a cylinder cover 11 fixedly installed at the end of the cylinder barrel 1, a piston rod 2 slidably connected to the cylinder barrel 1, a dust scraping mechanism 3 installed on the cylinder cover 11, the dust scraping mechanism 3 including several L-shaped mounting plates 31 distributed around the cylinder cover 11, several connecting mechanisms 4 distributed around the cylinder cover 11 installed below the cylinder cover 11, and the L-shaped mounting plates 31 are fixedly installed on the cylinder cover 11 through the connecting mechanisms 4. Each L-shaped mounting plate 31 is equipped with a sliding mechanism 5, and an arc plate 32 is slidably connected to the upper side wall of the L-shaped mounting plate 31 through the sliding mechanism 5. The arc plate 32 is inclined along the axis of the piston rod 2, and a detachable plastic arc scraper 33 is inserted on the arc plate 32.

[0026] It should be noted that the hydraulic cylinder in this invention is used in a crane. The L-shaped mounting plate 31 is fixed to the cylinder head 11 by the connecting mechanism 4. The sliding mechanism 5 applies elastic force to the plastic arc-shaped scraper 33 on the arc-shaped plate 32, so that the upper end of the plastic arc-shaped scraper 33 is attached to the piston rod 2. Multiple plastic arc-shaped scrapers 33 are arranged in a ring around the outer wall of the piston rod 2. During the retraction of the piston rod 2, the dust and impurities adhering to the outer wall of the piston rod 2 are scraped off. This invention uses the plastic arc-shaped scraper 33 to scrape off the dust and impurities on the outer wall of the piston rod 2 when it retracts, which can prevent the dustproof ring of the hydraulic cylinder itself from being damaged by prolonged direct contact with dust and other impurities. This effectively extends the service life of the dustproof ring and reduces hydraulic cylinder failure and maintenance costs caused by premature damage to the dustproof ring. At the same time, the multiple L-shaped mounting plates 31 arranged around the cylinder can shield the exposed dustproof ring of the hydraulic cylinder itself, preventing direct ultraviolet radiation and protecting the dustproof ring.

[0027] In the embodiments of this utility model, please refer to Figure 2 , Figure 3 and Figure 4 The connecting mechanism 4 includes an L-shaped clamping plate 41, which is installed below the cylinder head 11. Lugs 42 are fixedly installed on both the L-shaped clamping plate 41 and the L-shaped mounting plate 31 and are connected and locked to the cylinder head 11 by locking bolts 43.

[0028] It should be noted that during the installation of the device, the L-shaped mounting plate 31 is clamped on the outer wall of the cylinder head 11 near the piston rod 2, and the L-shaped clamping plate 41 is clamped on the outer wall of the cylinder head 11 near the cylinder barrel 1. The lugs 42 installed on both are connected and locked by the locking bolts 43, thus completing the installation of the arc plate 32. In this utility model, the L-shaped clamping plate 41 and the L-shaped mounting plate 31 are clamped from both sides of the cylinder head 11 respectively, and the lugs 42 are connected and fastened by the locking bolts 43. The connection is firm and stable, so that the dust scraping mechanism 3 remains stable when the hydraulic cylinder is working and will not loosen due to vibration or other external forces, thus ensuring the normal realization of the dust scraping function.

[0029] In the embodiments of this utility model, please refer to Figure 2 and Figure 4 A hoop groove 411 is provided on the outer side wall of several L-shaped card plates 41, and the hoop groove 411 on several L-shaped card plates 41 forms an annular card groove structure, and a clamp 6 is fixedly installed in the annular card groove structure.

[0030] It should be noted that: the clamp 6 is clamped in the clamp groove 411, which can tightly clamp multiple L-shaped clamps 41 together, so that multiple L-shaped clamps 41 can be firmly restricted on the cylinder head 11, preventing the L-shaped clamps 41 from shifting or shaking on the cylinder head 11; the clamp 6 can effectively enhance the stability of the connecting mechanism 4 and the dust scraping mechanism 3.

[0031] In the embodiments of this utility model, please refer to Figure 2 and Figure 3 The sliding mechanism 5 includes a sliding plate 52, which is slidably installed in the sliding cavity 51 of the L-shaped mounting plate 31 and slidably connected to the sliding cavity 51. An arc-shaped sealing plate 56 for sealing the opening is installed at the arc-shaped outer wall opening of the L-shaped mounting plate 31. A spring 53 is fixedly installed on one side wall of the arc-shaped sealing plate 56 inside the sliding cavity 51, and the other end of the spring 53 abuts against the inner wall of the sliding plate 52. A strip-shaped opening 54 communicating with the sliding cavity 51 is opened on the upper side wall of the L-shaped mounting plate 31. The sliding plate 52 is fixedly connected to the arc-shaped plate 32 through a connecting rod 55 passing through the strip-shaped opening 54.

[0032] It should be noted that the slide plate 52 can slide in the sliding cavity 51, and the spring 53 is always in a compressed state, applying a force toward the piston rod 2 to the arc plate 32 fixedly connected by the connecting rod 55, so that the upper end of the plastic arc scraper 33 can always be in close contact with the outer wall of the piston rod 2. The plastic arc scraper 33 will have frictional wear, and the sliding mechanism 5 can keep the end of the plastic arc scraper 33 in close contact with the outer wall of the piston rod 2 to remove dust and impurities.

[0033] In the embodiments of this utility model, please refer to Figure 2 , Figure 3 and Figure 5 The arc-shaped sealing plate 56 is equipped with fixing screws 561, and the arc-shaped sealing plate 56 is fixed to the L-shaped mounting plate 31 by fixing screws 561.

[0034] It should be noted that the elasticity of spring 53 will gradually weaken after long-term use and needs to be replaced regularly. The arc-shaped sealing plate 56 seals the opening of the slide cavity 51, and the detachable arc-shaped sealing plate 56 facilitates the replacement of spring 53.

[0035] The distance between the connecting rod 55 and the innermost wall of the strip opening 54 is less than the minimum distance between the arc plate 32 and the piston rod 2; that is, when the connecting rod 55 is moved to the closest point of the strip opening 54 to the piston rod 2, the arc plate 32 still maintains a distance from the piston rod 2 and will not come into contact with the piston rod 2. The arc plate 32 will never come into contact with the piston rod 2, that is, it will not affect the piston rod 2, nor will it affect the arc plate 32 itself.

[0036] In the embodiments of this utility model, please refer to Figure 2 , Figure 3 and Figure 5 The upper end of the arc plate 32 is provided with an arc groove 321 with an L-shaped cross section, and a plastic arc scraper 33 with the same L-shaped cross section is inserted into the arc groove 321.

[0037] It should be noted that the plastic arc-shaped scraper 33 is inserted laterally into the arc-shaped slot 321 port on the side of the arc-shaped plate 32, which limits the plastic arc-shaped scraper 33 and firmly clamps it onto the arc-shaped plate 32. At the same time, it facilitates the disassembly and replacement of the plastic arc-shaped scraper 33 without the need for complicated disassembly and installation of the entire dust scraping mechanism 3, which greatly reduces the difficulty and workload of maintenance.

[0038] The ends of two adjacent plastic arc-shaped scrapers 33 are fitted together, so that multiple plastic arc-shaped scrapers 33 can tightly form a ring plate, effectively removing dust and impurities from the piston rod 2.

[0039] The working principle of the large hydraulic cylinder for cranes provided by this utility model is as follows:

[0040] L-shaped mounting plate 31 is clipped onto the outer wall of cylinder head 11 near piston rod 2, and L-shaped clamping plate 41 is clipped onto the outer wall of cylinder head 11 near cylinder barrel 1. The lugs 42 installed on both are connected and locked by locking bolts 43, thus completing the installation of arc plate 32. Slide plate 52 can slide in slide cavity 51. Spring 53 is always in a compressed state, applying a force towards piston rod 2 to arc plate 32 fixedly connected by connecting rod 55, so that the upper end of plastic arc scraper 33 can always be in close contact with the outer wall of piston rod 2. Multiple plastic arc scrapers 33 are arranged in a ring around the outer wall of piston rod 2. During the retraction of piston rod 2, dust and impurities adhering to the outer wall of piston rod 2 are scraped off. This invention utilizes a plastic arc-shaped scraper 33 to remove dust and impurities from the outer wall of the piston rod 2 during retraction. This prevents the dust seal of the hydraulic cylinder from being damaged by prolonged direct contact with dust and other impurities, thus effectively extending the service life of the dust seal and reducing hydraulic cylinder malfunctions and maintenance costs caused by premature damage to the dust seal. Simultaneously, multiple L-shaped mounting plates 31 arranged around the cylinder can shield the exposed dust seal from direct ultraviolet radiation, protecting it. The spring 53's elasticity gradually weakens after prolonged use, requiring periodic replacement. The arc-shaped sealing plate 56 seals the opening of the slide cavity 51, and the detachable arc-shaped sealing plate 56 facilitates the replacement of the spring 53.

[0041] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A large hydraulic cylinder of a crane, comprising a cylinder barrel (1) having a cylinder cover (11) fixedly installed at an end thereof, and a piston rod (2) inserted into the cylinder barrel (1) and in sliding connection with the cylinder barrel (1), characterized in that: The cylinder cover (11) is provided with a dust scraping mechanism (3), the dust scraping mechanism (3) comprises a plurality of L-shaped mounting plates (31) distributed around the cylinder cover (11), a plurality of connecting mechanisms (4) are arranged below the cylinder cover (11) and distributed around the cylinder cover (11), the L-shaped mounting plates (31) are fixedly installed on the cylinder cover (11) through the connecting mechanisms (4), a sliding mechanism (5) is arranged on each L-shaped mounting plate (31), and an arc-shaped plate (32) is slidably connected to the upper side wall of the L-shaped mounting plate (31) through the sliding mechanism (5); the arc-shaped plate (32) is arranged in a tilt manner along the axis direction of the piston rod (2), and a detachable plastic arc-shaped scraper (33) is arranged on the arc-shaped plate (32).

2. The crane large hydraulic cylinder according to claim 1, characterized in that, The connecting mechanism (4) comprises an L-shaped clamping plate (41), the L-shaped clamping plate (41) is arranged below the cylinder cover (11), and the L-shaped clamping plate (41) and the L-shaped mounting plate (31) are both fixedly provided with an ear (42) and are locked on the cylinder cover (11) through a locking bolt (43).

3. The crane large hydraulic cylinder according to claim 2, characterized in that, A hoop groove (411) is formed in the outer side wall of each L-shaped clamping plate (41), and hoop grooves (411) on the plurality of L-shaped clamping plates (41) form an annular clamping groove structure, and a clamping hoop (6) is fixedly arranged in the annular clamping groove structure.

4. The crane large hydraulic cylinder according to claim 1, characterized in that, The sliding mechanism (5) comprises a sliding plate (52), the sliding plate (52) is slidably arranged in a sliding cavity (51) of the L-shaped mounting plate (31) and is slidably connected with the sliding cavity (51), an arc-shaped sealing plate (56) is arranged at the opening of the arc-shaped outer wall of the L-shaped mounting plate (31) and is used for sealing the opening, a spring (53) is fixedly arranged on one side wall of the sliding cavity (51), one end of the spring (53) abuts against the inner wall of the sliding plate (52), a strip-shaped opening (54) is formed in the upper side wall of the L-shaped mounting plate (31) and is in communication with the sliding cavity (51), and the sliding plate (52) is fixedly connected with the arc-shaped plate (32) through a connecting rod (55) penetrating through the strip-shaped opening (54).

5. The crane large hydraulic cylinder according to claim 4, characterized in that, The arc-shaped sealing plate (56) is fixedly arranged on the L-shaped mounting plate (31) through a fixing screw (561).

6. The crane large hydraulic cylinder according to claim 4, characterized in that, The distance between the connecting rod (55) and the inner wall of the strip-shaped opening (54) is smaller than the minimum distance between the arc-shaped plate (32) and the piston rod (2).

7. The crane large hydraulic cylinder according to claim 1, characterized by An arc-shaped clamping groove (321) with an L-shaped cross section is formed in the upper end of the arc-shaped plate (32), and a plastic arc-shaped scraper (33) with an L-shaped cross section is arranged in the arc-shaped clamping groove (321).

8. The crane large hydraulic cylinder according to claim 1, characterized in that, The end portions of two adjacent plastic arc-shaped scrapers (33) are attached to each other.

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