Hydraulic oil cylinder capable of adjusting strokes at two ends

Abstract

The hydraulic oil cylinder comprises a cylinder barrel and a piston rod, the left end and the right end of the piston rod extend out of the cylinder barrel, the left end of the piston rod is a stroke length control end, the right end of the piston rod is an output end, and the left end of the piston rod is provided with a stroke length control mechanism controlled to reset through a spring. The right end of the piston rod is connected to the stroke position control mechanism, and the middle of the piston rod is connected with the piston driving mechanism. According to the hydraulic oil cylinder capable of adjusting the strokes at the two ends, the stroke length control mechanism designed at the left end can accurately adjust the stroke length, and the stroke position control mechanism designed at the right end can adjust the initial position of the stroke; especially, through the guide groove structure with the stroke extending effect, the stroke of the whole hydraulic oil cylinder can be amplified, and the driving speed of the hydraulic oil cylinder at the position of the arc-shaped groove is higher.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic control, in particular to a hydraulic oil cylinder with double-end adjustable stroke. Background Art

[0002] The commonly used hydraulic cylinder stroke fine-tuning process is through thread adjustment, but the adjustment range cannot be accurately known after adjustment; and the stroke position of the output end of the hydraulic cylinder is also fixed and generally cannot be adjusted. In other words, the stroke distance and position of the hydraulic cylinder will not be easily changed. In addition, the extension and retraction speed of the hydraulic cylinder during operation is determined by the hydraulic oil, and the hydraulic oil is a fluid, and the speed control of the fluid has its own limitations. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a hydraulic cylinder with double-end adjustable stroke to solve the problem of hydraulic cylinder stroke control.

[0004] In order to solve the above technical problems, the present invention provides a double-end adjustable stroke hydraulic cylinder, including a cylinder barrel and a piston rod, the left and right ends of the piston rod both extend from the cylinder barrel, wherein the left end of the piston rod is a stroke length control end, and the right end of the piston rod is an output end, the left end of the piston rod is provided with a stroke length control mechanism which is reset by a spring control, the right end of the piston rod is connected to the stroke position control mechanism, and the middle part of the piston rod is connected to the piston drive mechanism.

[0005] The stroke length control mechanism includes a base and a sleeve. The base is sleeved on the piston rod by a gap connection, and the sleeve is connected to the piston rod by a threaded connection. The left end face of the base is provided with a concave groove that can accommodate a spring, and the right center of the sleeve is provided with a boss that can enter the groove. The spring is located between the base and the sleeve and is pressed in the groove by the boss; the left side of the sleeve is connected to the piston rod by a locking nut.

[0006] An annular groove is formed around the boss and the inner wall of the sleeve, and the left end of the base is inserted into the annular groove, thereby determining the stroke length of the piston rod.

[0007] A transverse driving hole is provided on the side of the sleeve; a driving structure is provided on the left end of the piston rod; the driving structure can be a hexagonal screw hole or an elongated square nut.

[0008] Scales are respectively arranged on the outer surfaces of the connecting positions of the sleeve and the base, so as to determine the screwing distance of the sleeve relative to the base.

[0009] The stroke position control mechanism includes a fixed seat, a sliding sleeve, a connecting sleeve, a slider and a guide column, wherein the fixed seat is connected to the cylinder through the connecting sleeve, the sliding sleeve is installed inside the fixed seat, and the left end of the slider is connected to the right end of the piston rod through a thread; a guide groove is provided on the side wall of the slider, and the guide column is connected in the guide groove after passing through the fixed seat, thereby dividing the sliding sleeve into two left and right parts.

[0010] A threaded hole is arranged at the left end of the sliding block, and a larger accommodating cavity is arranged at the inner bottom of the threaded hole.

[0011] A bearing is installed at the end of the guide column; The guide groove is approximately in the shape of an obtuse triangle, including a straight side parallel to the axial direction and a hypotenuse forming an acute angle with the axial direction, and the direction of the hypotenuse is the same as the thread rotation direction of the right end of the piston rod.

[0012] The fixing seat adopts a structure in which the upper and lower parts are connected to each other, and a hollow circular hole is formed inside; a ring-shaped protrusion is provided in the center of the circular hole to divide the sliding sleeve into two parts, wherein the first part of the sliding sleeve is located between the protrusion and the connecting sleeve on the left side, and the other part is located on the right side of the protrusion; wherein the height of the protrusion does not exceed the thickness of the sliding sleeve.

[0013] The piston drive mechanism consists of the cylinder and a piston sleeve connected in the cylinder. The inner wall of the cylinder is smooth, and the piston sleeve is installed in the cylinder by a sliding connection. The middle surface of the piston rod is smooth and is used for sliding connection with the piston rod hole of the cylinder. The piston sleeve is sleeved on the piston rod and is sealed with the piston rod, and the right end of the piston sleeve is limited by the step structure of the piston rod.

[0014] An oil hole is arranged on the side wall near the left end of the cylinder, an air hole is arranged on the side wall near the right end of the cylinder, and the piston head on the piston sleeve is located between the oil hole and the air hole.

[0015] A sealing support ring is also provided at the right end inside the cylinder, and the sealing support ring is located between the inner wall of the cylinder and the cylindrical surface of the piston sleeve, wherein the sealing support ring is fixedly connected to the inner wall of the cylinder and slidably connected to the cylindrical surface of the piston sleeve.

[0016] The double-end adjustable stroke hydraulic cylinder provided by the present invention has a stroke length control mechanism designed at the left end that can accurately adjust the stroke length, and a stroke position control mechanism designed at the right end that can adjust the starting position of its stroke; in particular, through the guide groove structure that has a range-extending effect, the stroke of the entire hydraulic cylinder can be amplified, and the driving speed of the hydraulic cylinder at the arc groove position can be made faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic structural diagram of a hydraulic cylinder with double-end adjustable stroke according to an embodiment of the present invention.

[0018] Figure 2 It is a schematic structural diagram of a hydraulic cylinder with double-end adjustable stroke according to an embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of the structure of the slider described in an embodiment of the present invention.

[0020] Figure 4 This is the unfolded plan view of the guide groove on the slider.

[0021] In the figure: 10-piston rod; 20-stroke length control mechanism; 21-base; 211-groove; 22-sleeve; 221-boss; 222-annular groove; 223-driving hole; 23-spring; 24-locking nut; 25-scale; 30-piston drive mechanism; 31-cylinder barrel; 32-piston sleeve; 33-sealing support ring; 40-stroke position control mechanism; 41-fixed seat; 42-sliding sleeve; 43-connecting sleeve; 44-sliding block; 441-guide groove; 441a-straight edge; 441c-bevel edge; 442-threaded hole; 45-guide column; 46-bearing. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0025] like Figure 1-2 As shown, the double-end adjustable stroke hydraulic cylinder provided by the present invention comprises a cylinder barrel 31 and a piston rod 10, the left and right ends of the piston rod 10 both extend from the cylinder barrel 31, wherein the left end of the piston rod 10 is a stroke length control end, and the right end of the piston rod 10 is an output end, the left end of the piston rod 10 is provided with a stroke length control mechanism 20 controlled by a spring 23 for reset, the right end of the piston rod 10 is connected to a stroke position control mechanism 40, and the middle part of the piston rod 10 is connected to a piston drive mechanism 30. The piston rod passes through the center of the cylinder barrel 31, and the stroke length of the entire hydraulic cylinder is determined by the stroke length control mechanism 20 at the left end, and the position of the stroke start end of the hydraulic cylinder is determined by the stroke position control device 40 at the right end, and the stroke length and stroke position are adjustable. The entire hydraulic cylinder uses a combination of hydraulic pressure and springs to control the operation of the piston rod 10.

[0026] The stroke length control mechanism 20 includes a base 21 and a sleeve 22. The base 21 is sleeved on the piston rod 10 by a gap connection, and the sleeve 22 is connected to the piston rod 10 by a threaded connection. The left end face of the base 21 is provided with a concave groove 211 that can accommodate a spring, and the right center of the sleeve 22 is provided with a boss 221 that can enter the groove 211. The spring is located between the base 21 and the sleeve 22, and is pressed in the groove 211 by the boss 221; the left side of the sleeve 22 is connected to the piston rod 10 by a locking nut 24.

[0027] An annular groove 222 is formed around the boss 221 and the inner wall of the sleeve 22, and the left end of the base 21 is inserted into the annular groove 222. The stroke length of the piston rod 10 is determined thereby. The mating surfaces between the sleeve 22 and the base 21 are both bodies of revolution (i.e., structures such as cylinders, truncated cones, and cones), and they are fitted with clearances. The base 21 is fixed at the left end of the hydraulic cylinder and does not move. They are usually connected to each other by screws, and the sleeve 22 can move axially relative to the base 21.

[0028] A transverse driving hole 223 is provided on the side of the sleeve 22; a driving structure is provided on the left end of the piston rod 10; the driving structure can be a hexagonal screw hole or an elongated square nut. When the position of the sleeve 22 on the piston rod 10 needs to be adjusted, the piston rod 10 needs to be fixed by a driving structure (such as a wrench), and then a pin is inserted into the driving hole 223 to control the sleeve 22 to rotate relative to the piston rod 10, thereby adjusting the position of the sleeve 22 on the piston rod 10, and then locking the end 10 of the piston rod 10 with a locking nut 24. After the position of the sleeve 22 on the piston rod 10 is adjusted to move to the right, the relative distance between the sleeve 22 and the base 21 changes, thereby achieving the adjustment of the stroke length determined by the relative distance between the two. Among them, the relative distance refers to the distance between the left end of the base 21 and the bottom of the annular groove 222. When the sleeve 22 moves to the right with the piston rod 10, it will collide with the left end of the base 21, thereby reaching the end of the stroke.

[0029] Scales 25 are respectively provided on the outer surfaces of the connecting positions of the sleeve 22 and the base 21 to determine the screwing distance of the sleeve 22 relative to the base 21.

[0030] The stroke position control mechanism 40 includes a fixed seat 41, a sleeve 42, a connecting sleeve 43, a slider 44 and a guide column 45, wherein the fixed seat 41 is connected to the cylinder 31 through the connecting sleeve 43, the sleeve 42 is installed inside the fixed seat 41, and the left end of the slider 44 is connected to the right end of the piston rod 10 through a thread; a guide groove 441 is provided on the side wall of the slider 44, and the guide column 45 passes through the fixed seat 41 and is connected to the guide groove 441, thereby dividing the sleeve 42 into two left and right parts.

[0031] The left end of the slider 44 is provided with a threaded hole 442, and a larger accommodating cavity is provided at the inner bottom of the threaded hole 442. The accommodating cavity can accommodate the portion of the right end of the piston rod 10 extending from the thread, so that the threaded connection area is reduced and the friction force is also reduced.

[0032] The end of the guide column 45 is provided with a bearing 46; Figure 3-4As shown, the guide groove 441 is approximately in the shape of an obtuse triangle, the width of the guide groove 441 is the same as the diameter of the bearing 46, including a straight side 441a parallel to the axial direction and a hypotenuse 441c forming an acute angle with the axial direction, and the direction of the hypotenuse is the same as the thread rotation direction of the right end of the piston rod. The bearing 46 can roll along the edge of the guide groove 441, and the guide column 45 is connected to the fixed seat 41 in a longitudinally adjustable manner (for example, it can be connected to multiple mounting holes at different positions arranged longitudinally, or connected to a longitudinally arranged slide groove), so that the guide column 45 can be connected in the straight side or the hypotenuse. When the guide column is connected to the straight side 441a, the slider 44 will not rotate circumferentially with the extension and contraction; when the guide column is connected to the hypotenuse 441c, the slider 44 will rotate circumferentially while the piston rod is extended and contracted, and will produce relative movement with the piston rod while rotating, that is, it rotates with the thread rotation direction of the piston rod, so that the slider produces axial movement; Since the guide post 45 is fixed, the guide slot 441 makes the slider 44 rotate circumferentially under the action of the guide slot 441 during the guide driving process with the guide post 45, and the circumferential rotation can make the slider 44 rotate relative to the right end of the piston rod 10, so that the slider 44 moves axially relative to the piston rod 10. Since the slider is driven to telescope forward while rotating, the speed of the slider is changed. When the bevel 441c on the slider is the same as the thread rotation direction of the right end of the piston rod 10, the speed of the slider moving to the right will be amplified. It can be seen that through the coordinated design of the bevel 441c of the guide slot and the thread rotation direction of the piston rod, the speed and telescopic length of the slider can be adjusted at the same time, and the telescopic length determines the stroke length, thereby realizing the adjustment of the driving speed, stroke length and stroke position of the slider at the same time.

[0033] In an embodiment of the present invention, it is also possible to selectively design sliders 44 with different guide groove lengths and positions, and the inclinations of the beveled edges 441c in the slide grooves can also be made different, so that the position of the guide column is fixed. Replacing different sliders 44 can also achieve the coordination of the guide column with different guide grooves.

[0034] The fixing seat 41 adopts a structure in which the upper and lower parts are connected to each other, and a hollow circular hole is formed inside; an annular protrusion is provided in the center of the circular hole to divide the sliding sleeve 42 into two parts, wherein the first part of the sliding sleeve 42 is located between the protrusion and the connecting sleeve 43 on the left side, and the other part is located on the right side of the protrusion; wherein the height of the protrusion does not exceed the thickness of the sliding sleeve 42.

[0035] The piston drive mechanism 30 is composed of the cylinder 31 and a piston sleeve 32 connected to the cylinder 31. The inner wall of the cylinder 31 is smooth, and the piston sleeve 32 is installed in the cylinder 31 by a sliding connection. The middle surface of the piston rod 10 is smooth and is used for sliding connection with the piston rod 10 hole of the cylinder 31. The piston sleeve 32 is sleeved on the piston rod 10 and is sealed with the piston rod 10, and the right end of the piston sleeve 32 is limited by the step structure of the piston rod 10.

[0036] An oil hole is provided on the side wall near the left end of the cylinder 31 , and an air hole is provided on the side wall near the right end of the cylinder 31 . The piston head on the piston sleeve 32 is located between the oil hole and the air hole.

[0037] A sealing support ring 33 is also provided at the right end inside the cylinder 31. The sealing support ring 33 is located between the inner wall of the cylinder 31 and the cylindrical surface of the piston sleeve 32. The sealing support ring 33 is fixedly connected to the inner wall of the cylinder 31 and is slidably connected to the cylindrical surface of the piston sleeve 32.

[0038] The double-end adjustable stroke hydraulic cylinder provided by the present invention has a stroke length control mechanism 20 designed at the left end that can accurately adjust the stroke length, and a stroke position control mechanism 40 designed at the right end that can adjust the starting position of its stroke; in particular, through the guide groove 441 structure that has a range-extending effect, the stroke of the entire hydraulic cylinder can be amplified, and the driving speed of the hydraulic cylinder at the arc groove position can be made faster.

[0039] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. Double-end adjustable stroke hydraulic cylinder, characterized in that: It includes a cylinder and a piston rod, the left and right ends of the piston rod both extend from the cylinder, the left end of the piston rod is a stroke length control end, and the right end of the piston rod is an output end. The left end of the piston rod is provided with a stroke length control mechanism which is reset by a spring control, the right end of the piston rod is connected to the stroke position control mechanism, and the middle part of the piston rod is connected to the piston drive mechanism.

2. The hydraulic cylinder according to claim 1, characterized in that: The stroke length control mechanism includes a base and a sleeve. The base is sleeved on the piston rod by a gap connection, and the sleeve is connected to the piston rod by a threaded connection. The left end face of the base is provided with a concave groove that can accommodate a spring, and the right center of the sleeve is provided with a boss that can enter the groove. The spring is located between the base and the sleeve and is pressed in the groove by the boss; the left side of the sleeve is connected to the piston rod by a locking nut.

3. The hydraulic cylinder according to claim 2, characterized in that: An annular groove is formed around the boss and the inner wall of the sleeve, and the left end of the base is inserted into the annular groove, thereby determining the stroke length of the piston rod.

4. The hydraulic cylinder according to claim 3, characterized in that: A transverse driving hole is provided on the side of the sleeve; a driving structure is provided on the left end of the piston rod; the driving structure can be a hexagonal screw hole or an elongated square nut; Scales are respectively arranged on the outer surfaces of the connecting positions of the sleeve and the base, so as to determine the screwing distance of the sleeve relative to the base.

5. The hydraulic cylinder according to claim 1, characterized in that: The stroke position control mechanism includes a fixed seat, a sliding sleeve, a connecting sleeve, a slider and a guide column, wherein the fixed seat is connected to the cylinder through the connecting sleeve, the sliding sleeve is installed inside the fixed seat, and the left end of the slider is connected to the right end of the piston rod through a thread; a guide groove is provided on the side wall of the slider, and the guide column is connected in the guide groove after passing through the fixed seat, thereby dividing the sliding sleeve into two left and right parts.

6. The hydraulic cylinder according to claim 5, characterized in that: A threaded hole is provided at the left end of the slider, and a larger accommodating cavity is provided at the inner bottom of the threaded hole; A bearing is installed at the end of the guide column; The guide groove is approximately in the shape of an obtuse triangle, including a straight side parallel to the axial direction and a hypotenuse forming an acute angle with the axial direction, and the direction of the hypotenuse is the same as the thread direction of the right end of the piston rod; the bearing can roll along the edge of the guide groove, and the guide column is connected to the fixed seat in a longitudinally adjustable manner, so that the guide column can be connected in the straight side or the hypotenuse.

7. The hydraulic cylinder according to claim 6, characterized in that: The fixing seat adopts a structure in which the upper and lower parts are connected to each other, and a hollow circular hole is formed inside; a circular protrusion is provided in the center of the circular hole to divide the sliding sleeve into two parts, wherein the first part of the sliding sleeve is located between the protrusion and the connecting sleeve on the left side, and the other part is located on the right side of the protrusion; The height of the protrusion does not exceed the thickness of the sliding sleeve.

8. The hydraulic cylinder according to claim 1, characterized in that: The piston drive mechanism consists of the cylinder and a piston sleeve connected in the cylinder. The inner wall of the cylinder is smooth, and the piston sleeve is installed in the cylinder by a sliding connection. The middle surface of the piston rod is smooth and is used for sliding connection with the piston rod hole of the cylinder. The piston sleeve is sleeved on the piston rod and is sealed with the piston rod, and the right end of the piston sleeve is limited by the step structure of the piston rod.

9. The hydraulic cylinder according to claim 8, characterized in that: An oil hole is arranged on the side wall near the left end of the cylinder, an air hole is arranged on the side wall near the right end of the cylinder, and the piston head on the piston sleeve is located between the oil hole and the air hole.

10. The hydraulic cylinder according to claim 8, characterized in that: A sealing support ring is also provided at the right end inside the cylinder, and the sealing support ring is located between the inner wall of the cylinder and the cylindrical surface of the piston sleeve, wherein the sealing support ring is fixedly connected to the inner wall of the cylinder and slidably connected to the cylindrical surface of the piston sleeve.

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