Jacking oil cylinder structure and tower crane

Abstract

The utility model provides a jacking oil cylinder structure and a tower crane. A threaded cartridge valve, a rodless cavity exhaust device and a rod cavity exhaust device are mounted at the bottom of an oil cylinder; the rodless cavity exhaust device and the rod cavity exhaust device are each composed of an exhaust screw and a steel ball. The threaded cartridge valve is located on a rodless cavity oil way of the oil cylinder, and a valve hole used for installing the threaded cartridge valve is located on the center line of the cylinder bottom. The threaded cartridge valve is of a three-oil-port structure and comprises an oil inlet, an oil outlet and a control port, and the three oil ports are separated into different areas by a valve body outer circle sealing ring and comprise the control port area, the oil inlet area and the oil outlet area. According to the tower crane jacking oil cylinder, the functions of descending heavy load balance, rodless cavity exhaust and rod cavity exhaust are integrated, and the problem that the hydraulic valve, the oil pipe and the pressure measuring exhaust device possibly collide in the installation and transportation process of the tower crane jacking oil cylinder, and consequently the quality problem of the oil cylinder is caused can be effectively solved.

Description

Technical Field

[0001] The utility model relates to a jacking oil cylinder structure, in particular to a high-reliability tower crane jacking oil cylinder structure which prevents hydraulic valves and oil pipes from colliding during installation and transportation, and belongs to the technical field of hydraulic oil cylinders. Background Art

[0002] Currently, heavy-duty lifting cylinders in China generally use balancing valves or hydraulic locks to achieve heavy-load lowering or stopping at any position. Plate-type valves are often used, with valve seats machined on the outside of the cylinder for installation and connection. This occupies a large amount of external space, resulting in a non-compact structure and increasingly failing to meet the trend towards more compact and lightweight mainframes.

[0003] The existing patent discloses a compact tower crane lifting cylinder using a plug-in balancing valve (201922127414.1). This technology has the following shortcomings:

[0004] The article mentions that "the balancing valve is directly installed at any position on the bottom of the cylinder at the rear end of the cylinder body." The standardization level of the cylinder structure is not high, and the center position of the cylinder bottom cross-section is not fully utilized (Note: this position has the largest installation space and can ensure that the threaded cartridge valve is not exposed or is exposed to the minimum). The structure is not compact enough and does not have universal promotion significance. It is easy to bump into things during the transportation, installation, and maintenance of the cylinder. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the utility model provides a high-reliability tower crane lifting cylinder structure which can prevent hydraulic valves and oil pipes from colliding during installation and transportation.

[0006] The utility model is implemented according to the following technical solutions:

[0007] In the first aspect, the utility model provides a lifting cylinder structure, on which a threaded cartridge valve, a rodless chamber exhaust device and a rod chamber exhaust device are installed on the bottom of the cylinder; the rodless chamber exhaust device and the rod chamber exhaust device are both composed of an exhaust screw and a steel ball; the threaded cartridge valve is located in the rodless chamber oil circuit of the cylinder, and the valve hole for installing the threaded cartridge valve is located on the center line of the cylinder bottom; the threaded cartridge valve is a three-oil port structure, namely, an oil inlet, an oil outlet and a control port, and the three oil ports are respectively isolated into different areas by the outer circular sealing ring of the valve body, namely, a control port area, an oil inlet area and an oil outlet area.

[0008] In some embodiments, the rodless chamber exhaust device is composed of an exhaust screw II and a steel ball II; the rod chamber exhaust device is composed of an exhaust screw I and a steel ball I.

[0009] In some embodiments, the exhaust screw I and the exhaust screw II are both processed with a damping hole I and a damping hole II.

[0010] In some embodiments, a joint body I is welded on the bottom of the cylinder, and a coaxial stepped hole and a threaded hole are processed on the joint body I for installing the exhaust screw I and the steel ball I; the joint body I is also provided with an oil channel 1 and an oil channel 2 leading to the rod chamber of the cylinder.

[0011] In some embodiments, the joint body I is welded to the oil pipe, and the oil pipe is welded to the joint body II, and the oil pipe and the joint body II respectively contain oil passages leading to the rod chamber; the interior of the cylinder bottom contains oil passages 4, 5, 6, 7, 8, 9, 10, and 11; the oil passages 9 and 10 are orthogonal to the oil passage 7, the oil passage 8 is oblique to the oil passage 7, and the angle between the oil passage 8 and the oil passage 9 is A; the angle between the rodless chamber exhaust device and the horizontal direction of the cylinder bottom is B.

[0012] In some embodiments, the oil is parallel to the cartridge valve hole on the cylinder bottom; the connector I, oil pipe, connector body II, and oil channel 7 are in the same direction; the oil inlet of the threaded cartridge valve is located at the center position in the height direction of the cylinder bottom.

[0013] In some embodiments, the joint body I, the oil pipe and the joint body II are all arranged in a protective cover.

[0014] In some embodiments, a screw plug is installed at the end of the exhaust screw II, the oil inlet of the rodless chamber, and the oil inlet of the rod chamber.

[0015] In some embodiments, the threaded cartridge valve is a balancing valve or a hydraulic lock.

[0016] In a second aspect, the utility model provides a tower crane, comprising the above-mentioned jacking cylinder structure.

[0017] Beneficial effects of the utility model:

[0018] This new design integrates lowering heavy load balancing, rodless chamber exhaust, and rod chamber exhaust functions, effectively preventing collisions between the hydraulic valve, oil pipe, and pressure measurement and exhaust device during installation and transportation of the tower crane's lifting cylinder, which could lead to cylinder quality problems. This cylinder boasts a rational structure, comprehensive functionality, good manufacturability, and strong versatility, providing a valuable reference for the design of other similar products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are part of this utility model and are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be derived from these drawings without inventive effort.

[0020] In the attached figure:

[0021] Figure 1 This is the main view of the cylinder bottom of the utility model:

[0022] Figure 2 for Figure 1 Middle MM view;

[0023] Figure 3 for Figure 2 Middle LL view;

[0024] Figure 4 for Figure 2 Middle NN view;

[0025] Figure 5 for Figure 4 Enlarged view of point I in the middle.

[0026] Figure identification: 1. Cylinder bottom; 2. Exhaust screw I; 3. Steel ball I; 4. Connector body I; 5. Oil pipe; 6. Protective cover; 7. Connector body II; 8. Screw plug; 9. Exhaust screw II; 10. Steel ball II; 11. Threaded cartridge valve.

[0027] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0031] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 As shown, a lifting cylinder structure has a threaded cartridge valve 11, a rodless chamber exhaust device, and a rod chamber exhaust device installed on the cylinder base 1. Depending on the operating conditions, the threaded cartridge valve 11 can be a balancing valve or a hydraulic lock. It is located in the rodless chamber oil circuit of the cylinder and installed in the cartridge valve hole on the cylinder base 1. It is used for the working conditions of the cylinder lowering under load and stopping movement. The threaded cartridge valve 11 has a three-port structure, namely the oil inlet, oil outlet, and control port. The three oil ports are separated into different areas by the outer circular sealing ring of the valve body, namely the control port area, the oil inlet area, and the oil outlet area.

[0032] In a further embodiment, the rodless chamber exhaust system consists of an exhaust screw II9 and a steel ball II10, while the rod chamber exhaust system consists of an exhaust screw I2 and a steel ball I3. Damping orifices 1 and 2 are machined into exhaust screws I2 and II9. A screw plug 8 is installed at the ends of the exhaust screw II9, the rodless chamber oil inlet, and the rod chamber oil inlet.

[0033] The rodless chamber venting process is as follows: Tighten vent screw II9, compressing steel ball II10 to block oil passage 11 leading to the rodless chamber. When venting is required, loosen vent screw II9 and steel ball II10 by turning them counterclockwise 1-2 turns. This opens oil passage 11 leading to the rodless chamber, allowing the air in the cylinder's rodless chamber to be expelled. After venting, tighten vent screw II9 again. Damping orifices 1 and 2 prevent the cylinder's rodless chamber from excessively discharging hydraulic oil during the venting process, which could create a risk of rapid cylinder retraction. The principle behind venting the rodless chamber is the same as that for the rodless chamber.

[0034] Joint body I4 is welded to cylinder base 1. It features coaxial stepped and threaded holes for mounting bleed screw I2 and steel ball I3. It also contains oil passages 1 and 2, which lead to the rod chamber of the cylinder. Joint body I4 is welded to oil pipe 5, which is in turn welded to joint body II7. Each of these two passages provides access to the rod chamber. Cylinder base 1 internally contains oil passages 4, 5, 6, 7, 8, 9, 10, and 11. When the cylinder is extended, high-pressure oil first flows through the rodless chamber inlet to the threaded cartridge valve inlet area, then opens the threaded cartridge valve to the outlet area, and then enters the rodless chamber of the cylinder through oil channel 4, driving the cylinder to extend. When the cylinder is retracted, high-pressure oil first flows through oil channels 9, oil channels 7, and oil channels 10 to the threaded cartridge valve control port area, driving the threaded cartridge valve's pilot control piston to push open the internal poppet valve, controlling the opening of the rodless chamber oil channel of the test cylinder and ensuring normal oil return from the rodless chamber. Simultaneously, high-pressure oil enters the rod chamber of the cylinder through oil channels 8, oil channels 1, oil channels 2, and oil channels 3, driving the cylinder to retract. When neither the rod nor the rodless chamber inlets are receiving oil, threaded cartridge valve 11 locks the cylinder to prevent it from sliding down. Protective cover 6 prevents any collisions between connector body I4, oil pipe 5, and connector body II7 during installation.

[0035] The threaded cartridge valve hole on cylinder base 1 is located on the centerline of cylinder base 1, and oil passage 7 is parallel to the cartridge valve hole on cylinder base 1. Oil passages 9 and 10 are perpendicular to oil passage 7, and oil passage 8 is at an oblique angle to oil passage 7. The angle between oil passages 8 and 9 is A. Connector body I4, oil pipe 5, and connector body II7 are aligned with oil passage 7. The oil inlet of threaded cartridge valve 11 is located at the center of the cylinder base height. The angle between the rodless chamber exhaust device and the horizontal direction of cylinder base 1 is B.

[0036] Generally speaking, whether a threaded cartridge valve 11 is a balancing valve or a hydraulic lock, the valve hole can be machined in the center of the cylinder base 1 (because this location maximizes available space). If the positions of the control port, oil inlet, and oil outlet areas vary due to the selected threaded cartridge valve 11, the hydraulic oil circuit connectivity requirements can be met by adjusting angles A and B, as well as the height difference between oil passages 10 and 11 and the horizontal axis of the cylinder base. This creates a standardized integrated cylinder-valve structure that integrates lowering heavy-load balancing, rodless chamber exhaust, and rod chamber exhaust functions.

[0037] In summary, the technical problem to be solved by this utility model is to provide a high-reliability tower crane lifting cylinder structure that prevents collisions between hydraulic valves and oil pipes during installation and transportation, in contrast to the existing technology. This structure integrates lowering heavy load balancing, rodless chamber exhaust, and rod chamber exhaust functions, effectively preventing collisions between hydraulic valves, oil pipes, and pressure measuring and exhaust devices during installation and transportation of the tower crane lifting cylinder, which could lead to cylinder quality problems. This cylinder has a reasonable structure, complete functions, good manufacturability, and strong versatility, providing a reference for the design of other similar products.

[0038] The tower crane provided by the present invention is described below. The tower crane described below and the jacking cylinder structure described above can be referred to each other.

[0039] The utility model provides a tower crane, which may include the jacking cylinder structure as described in any one of the above embodiments.

[0040] The beneficial effects achieved by the tower crane provided by the present invention are consistent with the beneficial effects achieved by the jacking cylinder structure provided by the present invention, and will not be described in detail here.

[0041] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0042] Furthermore, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are also intended to fall within the scope of protection of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art will be able to use them in combination based on the known technical solutions and the technical problems to be solved by this application.

[0043] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments using the above-mentioned technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A jacking cylinder structure, characterized in that: A threaded cartridge valve, a rodless cavity exhaust device and a rod cavity exhaust device are installed on the bottom of the oil cylinder; The rodless cavity exhaust device and the rod cavity exhaust device are both composed of an exhaust screw and a steel ball; The threaded cartridge valve is located in the rodless chamber oil circuit of the oil cylinder, and the valve hole for installing the threaded cartridge valve is located on the center line of the cylinder bottom; The threaded cartridge valve has a three-oil-port structure, namely, an oil inlet, an oil outlet and a control port. The three oil ports are separated into different areas by the outer circular sealing ring of the valve body, namely, the control port area, the oil inlet area and the oil outlet area.

2. A jacking cylinder structure according to claim 1, characterized in that: The rodless chamber exhaust device is composed of an exhaust screw II and a steel ball II; the rod chamber exhaust device is composed of an exhaust screw I and a steel ball I.

3. The jacking cylinder structure according to claim 2, characterized in that: The exhaust screw I and the exhaust screw II are both processed with a damping hole I and a damping hole II.

4. The jacking cylinder structure according to claim 2, characterized in that: A joint body I is welded on the bottom of the cylinder, and a coaxial stepped hole and a threaded hole are machined on the joint body I for installing an exhaust screw I and a steel ball I; oil passages 1 and 2 leading to the rod chamber of the cylinder are also provided in the joint body I.

5. The jacking cylinder structure according to claim 4, characterized in that: The joint body I is welded to the oil pipe, and the oil pipe is welded to the joint body II. The oil pipe and the joint body II respectively contain oil passages leading to the rod cavity. The interior of the cylinder bottom includes oil channels 4, 5, 6, 7, 8, 9, 10, and 11; the oil channels 9 and 10 are orthogonal to the oil channel 7, the oil channel 8 is at an oblique angle to the oil channel 7, and the angle between the oil channel 8 and the oil channel 9 is A; the angle between the rodless chamber exhaust device and the horizontal direction of the cylinder bottom is B.

6. The jacking cylinder structure according to claim 5, characterized in that: The oil is parallel to the cartridge valve hole on the cylinder bottom; the connector I, oil pipe, connector body II, and oil channel 7 are in the same direction; the oil inlet of the threaded cartridge valve is located at the center position in the height direction of the cylinder bottom.

7. The jacking cylinder structure according to claim 5, characterized in that: The joint body I, the oil pipe and the joint body II are all arranged in a protective cover.

8. The jacking cylinder structure according to claim 2, characterized in that: A screw plug is installed at the end of the exhaust screw II, the rodless chamber oil inlet, and the rod chamber oil inlet.

9. The jacking cylinder structure according to claim 1, characterized in that: The threaded cartridge valve is a balancing valve or a hydraulic lock.

10. A tower crane, characterized in that: It comprises the jacking cylinder structure according to any one of claims 1 to 9.

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