Gear rack oscillating cylinder with built-in oil path

Abstract

The utility model relates to the technical field of oscillating cylinders, in particular to an oil way built-in type gear rack oscillating cylinder which comprises a cylinder barrel, and a rack is arranged on the outer side wall of the cylinder barrel in the axial direction of the cylinder barrel; the shell is arranged outside the cylinder barrel in a covering manner; the piston rod penetrates through the cylinder barrel and is fixedly connected with the shell, and a piston is arranged on the piston rod and used for dividing the internal space of the cylinder barrel into two oil cavities; the gear is rotationally arranged in the shell and is meshed with the rack; the cylinder barrel can slide in the axial direction of the piston rod so as to drive the gear to rotate. According to the swing cylinder, the cylinder barrel is arranged in the shell, the piston rod and the cylinder barrel are arranged in a sealed mode, the cylinder barrel moves in the axial direction of the piston rod, an oil cylinder of the swing cylinder is arranged inside, oil leakage is prevented, the rack is arranged on the outer side wall of the cylinder barrel, and therefore a larger load can be provided under the same specification.

Description

Technical Field

[0001] This application relates to the field of swing cylinder technology, and more particularly to a hydraulically integrated gear and rack swing cylinder. Background Technology

[0002] There are many designs for mechanisms that convert linear motion to rotary motion in industrial equipment. Among them, the structure of the swing cylinder has been continuously improved, and the manufacturing process has become increasingly sophisticated. In particular, the variety of sealing materials has expanded, and their performance has improved. Due to their large swing angle, compact structure, high output torque, low starting pressure, high efficiency, long service life, and applicability to various working media, swing cylinders are increasingly being adopted by more and more equipment due to their outstanding advantages and good quality. Gear and rack swing cylinders are simple in structure, easy to seal, and have relatively smooth torque and angular velocity transmission. Their positional accuracy is easy to control, and the swing angle of the gear shaft is proportional to the length of the rack. Therefore, the swing angle of the gear shaft can be arbitrarily selected and can be greater than 360°. Therefore, gear and rack swing cylinders are widely used in steel, light industry, military, environmental protection, hydropower and other fields, such as the tilting swing cylinder of the ladle in the steel plant, the swing cylinder of the rotating arm in the wire rod mill, the swing cylinder for reducing the sway of the warship, the swing cylinder for the sweeper, and the swing cylinder for opening valves.

[0003] Current rack and pinion oscillating cylinders typically have two pistons inside the cylinder barrel, connected by a rack. A gear is positioned perpendicular to the rack, driving a rotating shaft that outputs rotational torque via bearings. This type of rack and pinion oscillating cylinder has the following disadvantages: 1. The sealing of the oil chamber and the cavity relies mainly on the sealing rings on the two pistons. Under the daily impact of high-pressure oil, oil can enter the cavity through the pistons. Therefore, to prevent oil leakage, the drain port of the cavity needs to be opened periodically for draining, making the operation cumbersome and the timing of oil cleaning unpredictable; 2. Because the rack and pinion are arranged between the two pistons, the overall gear... The length and width of the rack are limited, and the load output of the rack and pinion cylinder largely depends on the width of the gear and rack. Therefore, increasing the load requires increasing the oil pressure, but the pressure that the rack and pinion can bear is limited. Thus, the load of a rack and pinion cylinder cannot be increased without increasing the cylinder diameter, which limits its application range in some heavy-duty conditions. 3. Because the gears and racks in a rack and pinion cylinder are vertically distributed, they are generally quite large, especially when high torque is required. Therefore, it is crucial to reduce the overall size of the rack and pinion cylinder while maintaining the same output torque. In conclusion, developing a rack and pinion cylinder with reliable sealing, high load capacity, small size, and low cost is of paramount importance. Utility Model Content

[0004] This utility model aims to solve one of the problems in the background art.

[0005] To address these issues, this invention provides an oil circuit-integrated gear and rack swing cylinder to solve problems such as low load capacity and large installation space required for swing cylinders.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A hydraulically integrated gear and rack swing cylinder includes,

[0008] A cylinder barrel, wherein a rack is provided on the outer side wall of the cylinder barrel along its axial direction;

[0009] A housing, which covers the cylinder barrel;

[0010] A piston rod that passes through the cylinder and is fixedly connected to the housing, and a piston is provided on the piston rod to divide the internal space of the cylinder into two oil chambers;

[0011] Gear, which is rotatably disposed within the housing and meshes with a rack;

[0012] The cylinder can slide along the axial direction of the piston rod to drive the gear to rotate.

[0013] Furthermore, the piston rod is fixedly connected to the housing, and oil ports are provided at both ends of the piston rod. Two independent oil passages are provided at each end of the piston rod, namely oil passage A and oil passage B. Two sets of oil holes are provided on the side wall of the piston rod near the piston. One set of oil holes connects oil passage A and an oil chamber, and the other set of oil holes connects oil passage B and another oil chamber.

[0014] Furthermore, a guide sleeve is provided at the end of the cylinder, and the piston rod passes through the guide sleeve.

[0015] Furthermore, a sealing ring assembly is provided between the guide sleeve and the piston rod.

[0016] Furthermore, a buffer copper sheet is provided inside the guide sleeve, and the buffer copper sheet is opposite to the end face of the piston.

[0017] Furthermore, a one-way valve is provided on the guide sleeve.

[0018] Furthermore, a planar bearing is provided between the cylinder and the housing.

[0019] Furthermore, the planar bearing and the rack are located on opposite sides of the cylinder.

[0020] Furthermore, a displacement sensor is provided on the side wall where the housing connects to the end of the piston rod.

[0021] Furthermore, the gear is rotatably connected to the housing via a gear shaft, the gear is located inside the housing, and a front cover and a rear cover are respectively connected between the two ends of the gear shaft and the housing.

[0022] The beneficial effects of this utility model are that, by placing the cylinder barrel inside the housing and sealing the piston rod with the cylinder barrel, the cylinder barrel moves axially along the piston rod, thus achieving an internally mounted swing cylinder, preventing oil leakage. This is particularly promising for the food processing industry or working environments where oil is not permitted. A good sealing environment enhances the sealing effect and significantly extends the service life of the sealing ring assembly, reducing costs.

[0023] Furthermore, by mounting the rack on the outer wall of the cylinder barrel, a greater load can be provided for the same specifications. While providing the same torque, this cylinder is smaller in size, and the housing can be made open according to customer requirements, saving material and installation space. This reduces the cylinder's starting pressure and impact, increasing its service life. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of the oil circuit built-in gear and rack swing cylinder in this utility model.

[0026] Figure 2 This is a schematic diagram of the gear installation structure in this utility model.

[0027] Figure 3 This is a schematic diagram of the installation position of the buffer copper sheet in this utility model.

[0028] In the diagram: 1. Housing; 2. Cylinder; 3. Piston rod; 4. Piston; 5. Gland; 6. Guide sleeve; 7. Rack; 8. Gear; 9. Buffer copper sheet; 10. Sealing ring assembly; 11. Oil port A; 12. Oil port B; 13. Oil chamber A; 14. Oil chamber B; 15. Oil passage A; 16. Oil passage B; 17. Oil hole; 18. Surface bearing; 19. Surface bearing housing; 20. Displacement sensor; 21. Front cover; 22. Rear cover; 23. Check valve; 24. Retaining ring. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] A hydraulically integrated gear and rack swing cylinder includes a housing 1, a cylinder barrel 2, a gear 8, and a piston rod 3.

[0033] The housing 1 has two mounting ports facing each other. Two pressure caps 5 are provided at the mounting ports on the housing 1. The piston rod 3 passes through the pressure caps 5 and is fixedly connected to the pressure caps 5. Both ends of the piston rod 3 are provided with oil ports, namely oil port A11 and oil port B12. The cylinder 2 is set inside the housing 1 and is sleeved on the piston rod 3. The piston 4 is provided on the piston rod 3. The piston 4 is sealed to the inner wall of the cylinder 2. The piston 4 divides the inside of the cylinder 2 into two oil chambers, namely oil chamber A13 and oil chamber B14. The piston rod 3 is provided with two sets of oil holes 17, which are connected to oil chamber A13 and oil chamber B14 respectively. Each set of oil holes 17 has multiple oil holes 17 arranged along the circumference of the piston rod 3. The piston rod 3 is provided with oil passages A15 and B16. Oil passage A15 is used to connect oil A and oil chamber A13, and oil passage B16 is used to connect oil port B12 and oil chamber B14.

[0034] It should be noted that a planar bearing seat 19 is provided on the housing 1, and a planar bearing 18 is provided between the planar bearing seat 19 and the outer wall of the cylinder 2, which facilitates the linear movement of the cylinder 2. A guide sleeve 6 is provided at each end of the cylinder 2, and the end of the piston rod 3 passes through the guide sleeve 6. A sealing ring assembly 10 is provided between the piston rod 3 and the guide sleeve 6. The sealing ring assembly 10 includes multiple sealing rings arranged axially along the piston rod 3. A buffer copper sheet 9 is provided on the side of the guide sleeve 6 near the piston 4. A receiving groove is provided on the guide sleeve 6 to accommodate the buffer copper sheet 9. A retaining ring 24 is provided at the opening of the receiving groove to limit the buffer copper sheet 9. Thus, when the guide sleeve 6 is close to the end face of the piston 4, the oil flow area can be reduced to achieve a buffering effect.

[0035] Gear 8 is rotatably connected to housing 1 via gear shaft. Gear 8 is located inside housing 1. Front cover 21 and rear cover 22 are respectively connected between the two ends of gear shaft and housing 1. Rack 7 is connected to the outer side wall of cylinder 2 along the axial direction of piston rod 3. Rack 7 and cylinder 2 can be integrally formed. Gear 8 and rack 7 mesh with each other.

[0036] Oil enters piston rod 3 through oil port A11 and oil passage A15, and then enters oil chamber A13 through oil hole 17. During the high-pressure oil injection process, piston rod 3 remains stationary, while cylinder 2 and rack 7 move horizontally to the left under the action of oil thrust. This movement then drives gear 8 to rotate clockwise, completing one cycle. When oil enters oil chamber B14 through piston rod 3, cylinder 2 and rack 7 move horizontally to the right, driving gear 8 to rotate counterclockwise.

[0037] When gear 8 is under load, rack 7 is subjected to unidirectional force, that is, there is a downward force on rack 7. Therefore, a linear motion plane bearing 18 is installed below piston rod 3 to provide an upward support force when cylinder 2 and rack 7 are under force, so as to protect rack 7 so that it can move linearly better.

[0038] Meanwhile, to increase the load capacity of the swing cylinder, unlike the existing design where the cylinder 2 must be enlarged before the rack 7 can be enlarged, the rack 7 is directly incorporated into the cylinder 2, allowing for a greater increase in its size and providing more space for its installation. Furthermore, to address issues of excessive starting pressure and impact, multiple one-way valves 23 are installed on the guide sleeve 6, and a buffer copper sheet 9 is placed inside the guide sleeve 6 to reduce the oil flow area and achieve a buffering effect when the rack 7 approaches the piston rod 3 end face.

[0039] To achieve better sealing conditions and effects, this application replaces the traditional piston 4 seal with a piston rod 3 seal. Since the piston 4 cylinder undergoes electroplating and other processes after machining, the sealing ring assembly 10 has a good sealing environment, significantly reducing the risk of oil leakage. Because the oil flow is internal, the overall space occupied is very small; therefore, the housing 1 can be an open housing 1, saving materials and greatly reducing the overall volume of the cylinder. Simultaneously, a displacement sensor 20 is installed on the side wall connecting the housing 1 and the piston rod 3 end. A magnetic ring is installed inside the guide sleeve 6 at the end of the cylinder 2. During the horizontal movement of the cylinder 2 and rack 7, the guide sleeve 6 moves, which in turn moves the magnetic ring. The magnetic ring senses the displacement sensor 20, thereby precisely controlling the rotation angle of the gear 8.

[0040] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. A hydraulically integrated gear and rack swing cylinder, characterized in that, include, Cylinder (2), on the outer side wall of the cylinder (2) a rack (7) is provided along its axial direction; A housing (1) is provided to cover the cylinder (2); Piston rod (3), the piston rod (3) passes through the cylinder (2) and is fixedly connected to the housing (1), and a piston (4) is provided on the piston rod (3) to divide the internal space of the cylinder (2) into two oil chambers; Gear (8), which is rotatably disposed in housing (1) and meshes with rack (7); The cylinder (2) can slide along the axial direction of the piston rod (3) to drive the gear (8) to rotate.

2. The hydraulically integrated gear and rack swing cylinder according to claim 1, characterized in that, The piston rod (3) is fixedly connected to the housing (1). Both ends of the piston rod (3) are provided with oil ports. Both ends of the piston rod (3) are provided with two independent oil passages, namely oil passage A (15) and oil passage B (16). Two sets of oil holes (17) are provided on the side wall of the piston rod (3) near the piston (4). One set of oil holes (17) connects oil passage A (15) and an oil chamber, and the other set of oil holes (17) connects oil passage B (16) and another oil chamber.

3. The hydraulically integrated gear and rack swing cylinder according to claim 1, characterized in that, The cylinder (2) is provided with a guide sleeve (6) at its end, and the piston rod (3) passes through the guide sleeve (6).

4. The hydraulically integrated gear and rack swing cylinder according to claim 3, characterized in that, A sealing ring assembly (10) is provided between the guide sleeve (6) and the piston rod (3).

5. The hydraulically integrated gear and rack swing cylinder according to claim 4, characterized in that, A buffer copper sheet (9) is provided inside the guide sleeve (6), and the buffer copper sheet (9) is opposite to the end face of the piston (4).

6. The hydraulically integrated gear and rack swing cylinder according to claim 4, characterized in that, A one-way valve (23) is provided on the guide sleeve (6).

7. The hydraulically integrated gear and rack swing cylinder according to claim 1, characterized in that, A planar bearing (18) is provided between the cylinder (2) and the housing (1).

8. The hydraulically integrated gear and rack swing cylinder according to claim 7, characterized in that, The planar bearing (18) and the rack (7) are located on opposite sides of the cylinder (2).

9. The hydraulically integrated gear and rack swing cylinder according to claim 1, characterized in that, A displacement sensor (20) is provided on the side wall where the housing (1) and the piston rod (3) are connected.

10. The hydraulically integrated gear and rack swing cylinder according to claim 1, characterized in that, The gear (8) is rotatably connected to the housing (1) via a gear shaft. The gear (8) is located inside the housing (1). The two ends of the gear shaft are respectively connected to the housing (1) via a front cover (21) and a rear cover (22).

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