Precise matching positioning sleeve for piston and cylinder barrel of hydrostatic servo cylinder

Abstract

The utility model relates to positioning sleeve technical field especially for the precision fit positioning sleeve of static pressure servo cylinder piston and cylinder barrel, including outer cylinder, its characterized in that: the one side of outer cylinder is installed with servo motor, and the one end of servo motor is driven to have the shaft coupling, and the inside of shaft coupling one end is installed with screw rod, and the surface of screw rod is connected with piston positioning sleeve, and the one end of piston positioning sleeve is inserted with piston rod, and the surface of piston positioning sleeve is equipped with a plurality of locating slots, and the inner wall of outer cylinder is welded with a plurality of slide rails, and the both sides of piston positioning sleeve one end are welded with the boss, and the other two sides of piston positioning sleeve one end are equipped with the opening, and the one side of opening inner wall is installed with return spring. The device simplifies the connecting mode of piston rod and positioning sleeve, does not need to use multiple locking screws and additional tools to disassemble, reduces the complexity and labor intensity of operation, improves the disassembly replacement efficiency.

Description

Technical Field

[0001] This utility model relates to the field of positioning sleeve technology, specifically to a precision positioning sleeve for the piston and cylinder of a hydrostatic servo cylinder. Background Technology

[0002] Positioning sleeves, a technology in itself, provide positioning and alignment functions to ensure that components maintain accurate relative positions during movement. In hydrostatic servo cylinders, piston positioning sleeves are used for the relative fit between the piston and cylinder barrel, ensuring a perfect connection between the two, reducing friction and clearance, and helping to improve the stability of piston rod extension and retraction.

[0003] During the design process of this utility model, the following problems were discovered in the existing technology: Currently, common servo cylinder piston rods typically use multiple locking screws to fix one end of the piston rod inside the piston positioning sleeve. When it is necessary to disassemble and replace the piston rod, additional tools are required, and each locking screw must be manually turned. The operation is laborious and cumbersome, reducing replacement efficiency and making it impractical. Utility Model Content

[0004] The purpose of this invention is to provide a precision-fitting positioning sleeve for the piston and cylinder of a hydrostatic servo cylinder, so as to solve the problem mentioned in the background art that the piston rod needs to be disassembled and replaced by manually rotating each locking screw with additional tools.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a precision-fit positioning sleeve for a hydrostatic servo cylinder piston and cylinder barrel, including an outer cylinder barrel, a servo motor is installed on one side of the outer cylinder barrel, a coupling is driven at one end of the servo motor, a screw is installed inside one end of the coupling, a piston positioning sleeve is threadedly connected to the surface of the screw, and a piston rod is inserted into one end of the piston positioning sleeve. The piston positioning sleeve has openings on both sides of one end, a return spring is installed on one side of the inner wall of the opening, and a retaining pin is installed on one side of the return spring. Through holes are provided on both sides of one end of the inner wall of the piston rod. A pressing rod is slidably connected inside the through hole, and a pressing plate is installed at the bottom of the pressing rod.

[0006] The beneficial effects of this utility model are as follows: By simultaneously pressing the two pressing rods inward, the piston rod installation and fixation can be canceled, and the piston rod can be pulled outward to disassemble and remove it. Then, align the two slots opened on one side of the new piston rod with the protrusion of the piston positioning sleeve, press the two locking pins inward slightly, and push the piston rod to be fully inserted into one end of the piston positioning sleeve. This completes the disassembly and replacement of the piston rod, simplifies the connection method between the piston rod and the positioning sleeve, eliminates the need for multiple locking screws and additional tools for disassembly, reduces the complexity of operation and labor intensity, and improves the efficiency of disassembly and replacement.

[0007] To enable the piston rod to extend and retract via a servo motor: The piston rod is further configured such that its surface is slidably mounted on one end of the inner wall of the outer cylinder, and the piston positioning sleeve forms a transmission structure with the servo motor via a screw.

[0008] By adopting the above technical solution, an external power source is connected, the servo motor is started, and the coupling and screw are driven to rotate. Then, the power is transmitted through the thread to drive the piston positioning sleeve to move, which in turn pushes the piston rod surface to slide along one end of the inner wall of the outer cylinder. Thus, by adjusting the forward and reverse rotation of the servo motor, the piston rod can be driven to perform extension and retraction operations.

[0009] To ensure that the piston positioning cylinder does not rotate with the screw when subjected to threaded power, and to guarantee the stable operation of the piston rod extension and retraction: Further configuration: the surface of the piston positioning sleeve is provided with several positioning grooves, the inner wall of the outer cylinder is welded with several slide rails, and the locking pin forms a buffer structure with the opening through the return spring.

[0010] By adopting the above technical solution, when the piston positioning sleeve is displaced by the rotation of the screw, the multiple positioning grooves opened on the surface of the piston positioning sleeve will be obstructed by the slide rail, thereby preventing the piston positioning cylinder from rotating with the screw. Furthermore, the positioning grooves can slide along the surface of the slide rail, thus making the extension and retraction of the piston rod more stable.

[0011] To ensure that when one end of the piston positioning sleeve is inserted into the piston rod, the retaining pin can automatically align with the through hole opened at one end of the piston rod's inner wall: Further configuration: protrusions are welded to both sides of one end of the piston positioning sleeve, slots are provided on both sides of one end of the piston rod inner wall, and one end of the locking pin is spherical.

[0012] By adopting the above technical solution, the two slots on one side of the piston rod are aligned with the position of the protrusion, and then the piston rod is inserted into one end of the piston positioning sleeve. At this time, the locking pin will move with the piston positioning sleeve until it reaches the preset through hole position, so that the locking pin can automatically align with the through hole opened on one end of the inner wall of the piston rod without additional adjustment.

[0013] To ensure that the top of the piston rod can automatically embed itself into the through hole after the locking pin is aligned with the through slot, preventing the protrusion from coming out of the slot, one end of the piston rod is fixedly mounted on the piston positioning sleeve. The positioning groove is further configured such that its internal dimensions are consistent with the external dimensions of the slide rail, the positioning groove and the slide rail form a sliding structure, and the positioning groove is distributed equidistantly in a ring on the surface of the piston positioning sleeve.

[0014] By adopting the above technical solution, the locking pins at both ends are pressed inward simultaneously, at which point the return spring will be compressed. Then, the aligned piston rod is inserted into one end of the piston positioning sleeve. During the insertion process, the top of the locking pin will be pressed against the inner wall of the piston rod, keeping the return spring compressed until the protrusion is fully inserted into the inner cavity of the slot. At this time, the locking pin is aligned with the through hole, and the locking pin is no longer pressed against the inner wall of the piston rod. Using the elastic force, the locking pin can be pushed into the through hole, thereby fixing one end of the piston rod on the piston positioning sleeve.

[0015] To ensure that the piston rod is not obstructed during insertion into one end of the piston locating sleeve, and that the piston rod can be easily removed from the piston locating sleeve afterwards: The protrusion is further configured such that its external dimensions match the internal dimensions of the slot, and the surface of the protrusion is inserted into the inner wall of the slot.

[0016] By adopting the above technical solution and utilizing the relatively smooth characteristics of the spherical surface, only a slight inward press of the locking pin is needed to align its spherical surface with the inner wall of the piston rod. This allows for easy insertion and placement of the piston rod, with the locking pin easily embedded into the inner cavity of the piston rod. This avoids the locking pin obstructing the insertion and placement operation. Furthermore, when replacing the piston rod later, simply press both pressing rods inward simultaneously to push the pressure plate to squeeze the locking pin, causing it to gradually disengage from the through hole. This removes the positioning lock on the piston rod, allowing it to be removed.

[0017] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0018] Figure 1 This is a front view schematic diagram of the present utility model; Figure 2 This is a schematic diagram of an explosion inside the outer cylinder of this utility model; Figure 3 This is a plan view of the piston positioning sleeve and piston rod of this utility model.

[0019] In the diagram: 1. Outer cylinder; 2. Servo motor; 3. Coupling; 4. Screw; 5. Piston positioning sleeve; 6. Piston rod; 7. Opening; 8. Return spring; 9. Locking pin; 10. Through hole; 11. Pressing rod; 12. Pressing plate; 13. Positioning groove; 14. Slide rail; 15. Protrusion; 16. Slot. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0021] See Figures 1 to 3 The precision-fit positioning sleeve for the piston and cylinder of the hydrostatic servo cylinder includes an outer cylinder 1. A servo motor 2 is installed on one side of the outer cylinder 1. A coupling 3 is driven at one end of the servo motor 2. A screw 4 is installed inside one end of the coupling 3. A piston positioning sleeve 5 is threadedly connected to the surface of the screw 4. A piston rod 6 is inserted into one end of the piston positioning sleeve 5.

[0022] The piston positioning sleeve 5 has openings 7 on both sides of one end. A return spring 8 is installed on one side of the inner wall of the opening 7, and a retaining pin 9 is installed on one side of the return spring 8.

[0023] Through holes 10 are provided on both sides of one end of the inner wall of the piston rod 6. A pressing rod 11 is slidably connected inside the through hole 10, and a pressing plate 12 is installed at the bottom of the pressing rod 11.

[0024] In this embodiment, as Figure 2 As shown, the piston rod 6 is slidably mounted on one end of the inner wall of the outer cylinder 1, and the piston positioning sleeve 5 forms a transmission structure with the servo motor 2 through the screw 4.

[0025] In this embodiment, as Figure 2 As shown, the piston positioning sleeve 5 has several positioning grooves 13 on its surface, and several slide rails 14 are welded to the inner wall of the outer cylinder 1. The locking pin 9 forms a buffer structure with the opening 7 through the return spring 8.

[0026] In this embodiment, as Figure 3 As shown, protrusions 15 are welded to both sides of one end of the piston positioning sleeve 5, slots 16 are opened on both sides of one end of the inner wall of the piston rod 6, and one end of the locking post 9 is spherical.

[0027] In this embodiment, as Figure 3 As shown, the internal dimensions of the positioning groove 13 are the same as the external dimensions of the slide rail 14. The positioning groove 13 and the slide rail 14 form a sliding structure. The positioning groove 13 is distributed equidistantly in a ring on the surface of the piston positioning sleeve 5.

[0028] In this embodiment, as Figure 3As shown, the external dimensions of the protrusion 15 are the same as the internal dimensions of the slot 16, and the surface of the protrusion 15 is inserted into the inner wall of the slot 16.

[0029] The computer software involved in the servo motor and other hardware carriers in the technical solution is software technology known to those skilled in the art. It is merely applied to the aforementioned hardware carriers. In other words, the computer software portion of the technical solution is an essential technical feature for solving the aforementioned technical problem, constituting a necessary technical feature for the technical problem solved by this application, but it is not a differentiating technical feature or a point of technical improvement. The applicant has not made any technical improvements to the computer software portion involved in the aforementioned related hardware carriers, nor is it a key technical point of the invention.

[0030] Therefore, the "servo motor" involved in this application is a physical functional module that combines existing computer software programs or protocols with the hardware carrier of this application. The computer software programs involved in this physical functional module are all technologies known to those skilled in the art and are not improvements of this application. The improvement of this application should be the interaction relationship between the various physical functional modules, that is, the improvement of the construction of this application in conjunction with the positioning sleeve, so as to solve the corresponding technical problems to be solved by this application. The precision-fit positioning sleeve between the piston and cylinder barrel of this hydrostatic servo cylinder operates as follows: First, when the piston rod 6 needs to be disassembled and replaced, the operator needs to press the two pressing rods 11 inward simultaneously, pushing the pressure plate 12 to squeeze the locking pin 9, causing it to disengage from the through hole 10, thus removing the installation and fixation of the piston rod 6. Then, pull the piston rod 6 outward to remove it from one end of the piston positioning sleeve 5. When installing the new piston rod 6, the two slots 16 on one side of the piston rod 6 need to be aligned with the protrusions 15 of the piston positioning sleeve 5, and the two locking pins 9 need to be pressed inward slightly to compress the return spring 8, so that the spherical surface of the locking pin 9 is aligned with the inner wall of the piston rod 6. Finally, the piston rod 6 can be pushed into the piston positioning sleeve 5. After one end of the positioning sleeve 5 is fully inserted, the elastic force will push the locking pin 9 into the inner cavity of the through hole 10, thereby positioning and locking the piston rod 6. This completes the disassembly and replacement of the piston rod 6 without the need for additional tools and avoids the manual rotation and disassembly of each locking screw. Then, an external power supply can be connected to start the servo motor 2, which drives the coupling 3 and the screw 4 to rotate. The screw transmission force will then drive the piston positioning sleeve 5 to move, thereby pushing the surface of the piston rod 6 to slide along one end of the inner wall of the outer cylinder 1. By adjusting the forward and reverse rotation of the servo motor 2, the piston rod 6 can be moved to extend or retract.

[0031] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A precision-fit positioning sleeve for the piston and cylinder barrel of a hydrostatic servo cylinder, including an outer cylinder barrel (1), characterized in that: A servo motor (2) is installed on one side of the outer cylinder (1). A coupling (3) is driven at one end of the servo motor (2). A screw (4) is installed inside one end of the coupling (3). A piston positioning sleeve (5) is threaded on the surface of the screw (4). A piston rod (6) is inserted into one end of the piston positioning sleeve (5). The piston positioning sleeve (5) has openings (7) on both sides of one end. A return spring (8) is installed on one side of the inner wall of the opening (7), and a locking pin (9) is installed on one side of the return spring (8). The piston rod (6) has through holes (10) on both sides of one end of its inner wall. A pressing rod (11) is slidably connected inside the through hole (10), and a pressing plate (12) is installed at the bottom of the pressing rod (11).

2. The precision-fit positioning sleeve for the piston and cylinder of the hydrostatic servo cylinder as described in claim 1, characterized in that: The piston rod (6) is slidably mounted on one end of the inner wall of the outer cylinder (1), and the piston positioning sleeve (5) forms a transmission structure with the servo motor (2) through the screw (4).

3. The precision-fit positioning sleeve for the piston and cylinder of the hydrostatic servo cylinder as described in claim 1, characterized in that: The piston positioning sleeve (5) has several positioning grooves (13) on its surface, and several slide rails (14) are welded to the inner wall of the outer cylinder (1). The locking pin (9) forms a buffer structure with the opening (7) through the return spring (8).

4. The precision-fit positioning sleeve for the piston and cylinder of the hydrostatic servo cylinder as described in claim 1, characterized in that: The piston positioning sleeve (5) has protrusions (15) welded on both sides of one end, and slots (16) are opened on both sides of one end of the inner wall of the piston rod (6), and one end of the locking post (9) is spherical.

5. The precision-fit positioning sleeve for the piston and cylinder of the hydrostatic servo cylinder as described in claim 3, characterized in that: The internal dimensions of the positioning groove (13) are consistent with the external dimensions of the slide rail (14). The positioning groove (13) and the slide rail (14) form a sliding structure. The positioning groove (13) is distributed circumferentially and equidistantly on the surface of the piston positioning sleeve (5).

6. The precision-fit positioning sleeve for the piston and cylinder of the hydrostatic servo cylinder as described in claim 4, characterized in that: The external dimensions of the protrusion (15) are consistent with the internal dimensions of the slot (16), and the surface of the protrusion (15) is inserted into the inner wall of the slot (16).

Images