A kind of hydraulic mechanism piston rod automatic turning auxiliary device

Abstract

The utility model belongs to the field of piston rod finish machining, disclose a kind of auxiliary device of hydraulic mechanism piston rod automatic turning, including guide seat, tailstock support, guide column, center frame, follow cutter stop block and chip cleaner, auxiliary device is fixed in operation platform, guide column connects guide seat and tailstock support, piston rod one end is connected with machine tool spindle by clamping assembly and bearing, other end is by tailstock centre top and is tightly in the center hole of tailstock support, center frame is sleeved on guide column and is supported piston rod by spacing limit, follow cutter stop block cooperation cutter moves to drive center frame sliding, chip cleaner is arranged in center frame one side.Using the device can effectively solve the problem of processing deformation and vibration cutter, ensure that the size precision and surface roughness of part meet the requirements, greatly reduce rework operation and raw material loss;Eliminate the surface scratch and scrap risk caused by entangling scrap, avoid the additional cost and process interruption of manual dechipping;Realize full-automatic continuous production, improve production line operation efficiency and stability.

Description

Technical Field

[0001] This utility model belongs to the field of piston rod precision turning technology, specifically relating to an auxiliary device for automatic turning of piston rods in hydraulic mechanisms. Background Technology

[0002] As a core transmission component in hydraulic transmission and pneumatic control, the piston rod's machining precision directly determines the stability, sealing performance, and service life of the equipment, playing an irreplaceable role in industries such as construction machinery, automobile manufacturing, and industrial automation equipment. Currently, the manufacturing industry is comprehensively promoting industrial automation upgrades, replacing traditional manual operations with intelligent equipment and continuous production lines to improve production efficiency, optimize cost control, and enhance product quality stability. Among these processes, piston rod precision machining is a key step, and its process adaptability and automation compatibility are crucial factors affecting the overall success of the production line upgrade. Therefore, process improvements are urgently needed to meet the demands of automated production for continuous machining, consistent precision, and minimal human intervention.

[0003] However, there are many technological problems in the existing piston rod precision turning process that urgently need to be solved: First, the workpiece is prone to deformation during turning, which makes the part's accuracy unable to meet the design requirements, requiring frequent rework. This not only increases the consumption of raw materials and labor costs, but also makes it difficult to integrate into automated production processes because the rework process relies on manual judgment and operation. Second, there is obvious vibration during the machining process. This phenomenon is caused by the insufficient rigidity of the workpiece itself, which causes vibration under the action of cutting force, directly affecting the surface roughness of the part. This leads to the need to increase the grinding allowance in the subsequent grinding process to correct the surface quality, which not only prolongs the machining cycle, but also increases the cost of consumables such as grinding wheels. Third, the chips generated during the cutting process are long and strip-shaped, which are easy to wrap around the workpiece surface and form tangled chips. This not only scratches the machined surface and causes the part to be scrapped, but also requires a dedicated person to manually remove them, which increases labor costs. At the same time, the manual chip removal process interrupts the continuity of machining and hinders the smooth operation of automated production lines.

[0004] It is evident that in existing piston rod precision turning operations, there are problems such as machining deformation, vibrating cutter, and chip entanglement leading to poor piston rod machining accuracy. Utility Model Content

[0005] This utility model provides an auxiliary device for automatic turning of a hydraulic mechanism piston rod. The auxiliary device can effectively solve the problem of poor piston rod machining accuracy caused by machining deformation, vibration and chip entanglement, and improve the machining accuracy of the piston rod.

[0006] To achieve the above objectives, the present invention adopts the following technical content: An auxiliary device for automatic turning of a hydraulic piston rod includes: a guide seat and a tailstock support; Both the guide seat and the tailstock bracket are fixed to the operating table; A guide post is inserted between the guide seat and the tailstock bracket; The guide seat has a bearing installed in the inner hole with an interference fit. A clamping assembly is fixed to the end of the bearing. The clamping assembly is used to connect to the machine tool spindle and clamp one end of the piston rod. The other end of the piston rod is inserted into the center hole of the tailstock bracket and is fixed by the tailstock tip of the machine tool; A central frame is fitted onto the guide column; A tool-following block is provided on the top side of the center frame. The tool-following block is used to cooperate with the outer diameter finishing tool of the turret. The tool-following block can drive the center frame to slide along the guide column axis by the movement of the outer diameter finishing tool. A chip scraper is provided on the opposite side of the follow-cut stop block, and the chip scraper is located on the top of the other side of the center frame; A limiting gap is provided in the middle of the central frame, and the piston rod overlaps the limiting gap.

[0007] Furthermore, the clamping assembly includes a chuck connected to the machine tool spindle; The chuck is axially fixed with a chuck seat; The bearing inner diameter is engaged and fixed with the chuck seat; The chuck end face is provided with multiple sets of grippers along the circumferential direction. All sets of grippers can slide towards the center of the chuck end face to clamp the piston rod. The machine tool spindle can drive the chuck, chuck seat, bearings, and piston rod to move synchronously.

[0008] Furthermore, a pneumatic mechanism is connected to the end of the gripper.

[0009] Furthermore, the chuck and the chuck seat are connected by bolts.

[0010] Furthermore, the follower block and the center frame are connected by welding or bolts.

[0011] Furthermore, the follower block and the guide post are arranged perpendicularly to each other.

[0012] Furthermore, the follow-cut stop has a groove, which is inserted into the outer diameter finishing tool. When the outer diameter finishing tool is inserted into the groove, the follow-cut stop and the center support can slide along the guide post by moving.

[0013] Furthermore, the upper end face of the scraper is provided with a scraping blade, and the side near the piston rod is provided with an arc-shaped surface; the arc-shaped surface cooperates with the piston rod to provide auxiliary support for the piston rod.

[0014] Furthermore, rollers are provided at the joint between the central frame and the piston rod, and a limiting gap is formed between the two rollers.

[0015] Furthermore, at least two guide posts are inserted between the guide seat and the tailstock bracket; the guide posts are arranged in parallel.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides an auxiliary device for automatic turning of a hydraulic piston rod, including a guide seat, a tailstock support, a guide column, a center rest, a follow-stop block, and a chip scraper. The auxiliary device is fixed to the operating table. The guide column connects the guide seat and the tailstock support. One end of the piston rod is connected to the machine tool spindle through a clamping assembly and a bearing, while the other end is pressed against the center hole of the tailstock support by the tailstock tip. The center rest is fitted onto the guide column and supports the piston rod through a limiting gap. The follow-stop block moves in conjunction with the cutting tool to drive the center rest to slide. The chip scraper is located on one side of the center rest. The guide column and center rest form a multi-point rigid support, constraining the axial degree of freedom of the piston rod, enhancing the overall rigidity of the workpiece, and effectively counteracting bending deformation caused by cutting forces. The follow-stop block slides synchronously with the cutting tool, providing dynamic support force, suppressing workpiece vibration sources, and reducing cutting vibration. The chip scraper automatically removes chips during processing, preventing long chips from entangled. This device can effectively solve the problems of machining deformation and vibrating knife, ensure that the dimensional accuracy and surface roughness of parts meet the requirements, and significantly reduce rework and raw material loss; eliminate the risk of surface scratches and scrap caused by chip entanglement, avoid the additional cost and process interruption of manual chip removal; realize fully automated continuous production, shorten the processing cycle, reduce labor and consumable costs, and improve the efficiency and stability of production line operation.

[0017] Preferably, in this invention, the chuck is directly connected to the spindle, and the piston rod is firmly clamped by the grippers, ensuring smooth rotation of the workpiece and reducing vibration and offset during processing; the fixed design of the chuck seat and bearing enhances transmission efficiency, improves overall rigidity, avoids precision loss due to unstable clamping, and thus reduces surface roughness problems.

[0018] Preferably, in this invention, a pneumatic mechanism is connected to the gripper, and the pneumatic drive enables the gripper to open and close quickly and automatically, simplifying the gripping process and improving production efficiency; reducing reliance on manual operation, supporting seamless integration into automated production lines, reducing labor costs, and ensuring uniform clamping force to prevent processing errors caused by workpiece loosening.

[0019] Preferably, in this invention, the chuck and chuck seat are connected by bolts. Bolted connections provide high-strength fixation, enhancing the overall rigidity and stability of the assembly; preventing loosening or displacement during processing, ensuring reliable clamping, reducing the risk of deformation due to connection failure, and improving processing consistency and part quality.

[0020] Preferably, in this invention, the follow-stop block and the center support are connected by welding or bolts. Welding or bolting ensures a firm and reliable connection, allowing the follow-stop block to stably follow the movement of the cutting tool; it provides consistent power transmission, optimizes dynamic support performance, effectively suppresses cutting vibration, and ensures the smoothness and continuity of the machining process.

[0021] Preferably, in this invention, the follow-cut stop and the guide post are arranged perpendicularly to each other. This vertical arrangement optimizes the force transmission direction, reduces sliding friction and resistance, ensures smooth movement of the center frame along the guide post axis, improves the response efficiency of the follow-cut stop, further reduces the risk of tool vibration, and enhances machining stability.

[0022] Preferably, in this invention, the follow-stop block has a groove to form an insertion fit with the cutting tool. The groove design enables precise linkage between the cutting tool and the follow-stop block, and the movement of the cutting tool directly drives the sliding of the support; it provides instantaneous dynamic response, enhances real-time support for the workpiece, effectively counteracts cutting forces, suppresses vibration, and improves machining accuracy and efficiency.

[0023] Preferably, in this invention, the chip scraper has a chip scraping blade and an arc-shaped surface. The chip scraping blade can efficiently remove chips, prevent long chips from entangled, and avoid scratching the workpiece surface; the arc-shaped surface fits the piston rod to provide auxiliary support, enhance the rigidity of the workpiece, reduce deformation, and at the same time protect the processed area and reduce the risk of scrap.

[0024] Preferably, in this invention, rollers are provided at the overlap of the central frame to form a limiting gap. The roller design reduces friction, allows the piston rod to rotate smoothly, and prevents surface scratches; the limiting gap provides precise support, maintains the stability of the workpiece position, reduces the probability of deformation, supports continuous processing, and improves the smoothness of automation.

[0025] Preferably, in this invention, there are at least two parallel guide pillars. Multiple guide pillars enhance the overall stability and rigidity of the device, providing a uniform support distribution; effectively dispersing cutting forces, further reducing the risk of workpiece deformation and vibration, and ensuring a reliable and efficient machining process. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of an auxiliary device for automatic turning of a hydraulic mechanism piston rod provided in an embodiment of this utility model; Figure 2 An exploded view of an auxiliary device for automatic turning of a hydraulic piston rod, provided in an embodiment of this utility model; Figure 3 This is a schematic diagram of the connection structure between the gripper and the chuck provided in an embodiment of the present utility model; Figure 4 A schematic diagram of the assembly cross-section between the guide seat, bearing, and chuck seat provided in an embodiment of this utility model; Figure 5 This is a schematic diagram showing the assembly of the center frame, the follow-cut stop block, and the chip scraper provided in an embodiment of the present invention.

[0027] Figure label: 1. Clamping jaws; 2. Chuck; 3. Piston rod; 4. External turning tool; 5. Chip scraper; 6. Tailstock support; 7. Tailstock center; 8. Roller; 9. Guide post; 10. Center rest; 11. Follow stop; 12. Guide seat; 13. Bearing; 14. Chuck seat; 15. Limit clearance. Detailed Implementation

[0028] To make the technical problem solved by this utility model, the technical solution, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of this utility model. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they 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.

[0033] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 according to the specific circumstances.

[0035] like Figure 1 and Figure 2 As shown, this embodiment provides an auxiliary device for automatic turning of a hydraulic piston rod, including a basic support component guide seat 12 and a tailstock bracket 6; wherein, the guide seat 12 and the tailstock bracket 6 are both fixed to the machine tool operating table by bolts, and the two are arranged at intervals along the axial direction of the piston rod 3 to provide an installation reference for subsequent components and ensure the coaxiality of the overall structure.

[0036] For example, at least two guide posts 9 are inserted between the guide seat 12 and the tailstock bracket 6, and the guide posts 9 are parallel to each other. The guide posts 9 provide guidance for the axial sliding of the center frame 10, ensuring the straightness of the center frame 10 when it moves, thereby stabilizing the piston rod 3.

[0037] The inner hole of the guide seat 12 is fitted with an interference fit to install the bearing 13. The interference fit ensures that the bearing 13 is firmly installed in the guide seat 12, and avoids the bearing 13 from loosening during turning, which would affect the rotational accuracy of the piston rod 3.

[0038] like Figure 3 As shown, one end of the piston rod 3 is fixed by a clamping assembly, specifically including a chuck 2, a chuck seat 14, and multiple jaws 1; wherein, the chuck 2 is connected to the machine tool spindle, and the spindle provides the rotational power; the chuck seat 14 is axially fixed to the chuck 2 by bolts, the bolt connection facilitates disassembly and maintenance, and ensures the strength for synchronous rotation of the chuck 2 and the chuck seat 14; as shown Figure 4 As shown, the end of the chuck seat 14 engages within the inner diameter of the bearing 13 and rotates synchronously with the bearing 13. The end face of the chuck 2 is provided with multiple sets of jaws 1 along the circumferential direction, typically three jaws. The ends of the jaws 1 are connected to a pneumatic or hydraulic mechanism. The pneumatic mechanism drives the jaws 1 to slide towards the center of the chuck 2, thereby clamping the piston rod 3. The outer ring of the bearing 13 is fixed in the inner hole of the guide seat 12, achieving the cooperation between the rotating component chuck, the chuck seat, and the fixed component guide seat.

[0039] For example, the other end of the piston rod 3 is inserted into the center hole of the tailstock bracket 6 and is tightened and fixed by the tailstock tip 7 of the machine tool. The tightening action of the tailstock tip 7 prevents the piston rod 3 from moving axially, and cooperates with the clamping assembly to support both ends of the piston rod 3, thereby enhancing the overall rigidity. A bearing 13 can also be installed in the center hole of the tailstock bracket 6, through which the other end of the piston rod 3 passes and abuts against the tailstock tip 7 for tightening.

[0040] like Figure 5 As shown, a central frame 10 is fitted onto the guide column 9, and the central frame 10 can slide along the axial direction of the guide column 9. A limiting gap 15 is opened in the middle of the central frame 10, and the piston rod 3 overlaps on the limiting gap 15. To reduce friction, rollers 8 are provided at the overlap between the central frame 10 and the piston rod 3. The two rollers 8 form the limiting gap 15, so that the piston rod 3 rotates by rolling friction, reducing resistance and wear.

[0041] A follower block 11 is installed on the top side of one side of the center rest 10. The follower block 11 is connected to the center rest 10 by welding or bolts. The follower block 11 is arranged perpendicularly to the guide post 9 and has a groove. This groove forms an insertion fit with the outer diameter finishing tool 4 of the turret. Specifically, after the outer diameter finishing tool 4 is inserted into the groove, it can move itself to drive the follower block 11 and the center rest 10 to slide along the guide post 9, so that the center rest 10 always follows the turning part.

[0042] A chip scraper 5 is provided on the top of the other side of the center frame 10, opposite to the tool stop block 11. The upper side of the chip scraper 5 is provided with a chip scraping blade. Preferably, the side near the piston rod 3 is an arc-shaped surface. The arc-shaped surface cooperates with the piston rod 3 to both provide auxiliary support for the piston rod 3 and scrape off the chips generated during turning, avoiding chip entanglement that affects the machining process.

[0043] This embodiment also provides an assembly process for an auxiliary device for automatic turning of a hydraulic mechanism piston rod, the steps of which are as follows: First, fix the guide seat 12 and the tailstock bracket 6: fix the guide seat 12 and the tailstock bracket 6 on the machine tool operating table according to the design spacing, and ensure that their central axes are coaxial.

[0044] The bearing 13 is interference-fitted into the inner hole of the guide seat 12. Pay attention to the installation direction and position of the bearing 13 to ensure accurate engagement with the chuck seat 14 later.

[0045] Connect the clamping assembly and the guide seat: Fix the chuck 2 to the chuck seat 14 with bolts, and then engage the chuck seat 14 with the end of the bearing 13; then connect the chuck 2 to the machine tool spindle so that the spindle can drive the chuck 2 to rotate.

[0046] Insert two parallel guide posts 9 between the guide seat 12 and the tailstock bracket 6; fit the through hole at the bottom of the center frame 10 onto the guide posts 9, and adjust the position so that the piston rod 3 can overlap the roller 8; then install the follower block 11 on the top of the center frame 10 by welding or bolting and the chip scraper 5. The follower block 11 and the center frame 10 can be fixed in advance; ensure that the groove of the follower block 11 corresponds to the outer diameter finishing tool 4, and the arc surface of the chip scraper 5 faces the piston rod 3.

[0047] Place one end of the piston rod 3 between the jaws 1 of the chuck 2, and the pneumatic mechanism drives the jaws 1 to clamp the piston rod 3; then insert the other end of the piston rod 3 into the center hole of the tailstock bracket 6 and tighten it with the tailstock tip 7.

[0048] Insert the external diameter finishing tool 4 into the groove of the follower block 11 to ensure that the external diameter finishing tool 4 can drive the follower block 11 and the center rest 10 to slide.

[0049] This embodiment provides the working principle of an auxiliary device for automatic turning of a hydraulic mechanism piston rod, as detailed below: The machine tool spindle rotates, driving the chuck 2 to rotate; the chuck 2 drives the chuck seat 14 to rotate synchronously via bolts; the chuck seat 14 drives the inner ring of the bearing 13 to rotate, while the outer ring of the bearing 13 is fixed on the guide seat 12 and remains stationary; finally, the piston rod 3, clamped by the jaws 1, rotates synchronously with the spindle. At this time, the other end of the piston rod 3 is pressed against the tailstock tip 7, which also rotates stably around the spindle axis with the whole, providing rotational motion for turning.

[0050] The turret drives the external turning tool 4 to feed towards the piston rod 3 to be machined on the outer diameter, and moves along the axial direction of the piston rod 3, i.e., the axial direction of the guide post 9, to perform external turning. Since the external turning tool 4 is inserted into the groove of the follower block 11, when the external turning tool 4 moves axially, it will drive the follower block 11 to move; the follower block 11 then drives the center rest 10 to slide synchronously along the guide post 9.

[0051] In this way, during the turning process, the center rest 10 always follows the position of the external diameter finishing tool 4, and the roller 8 supports the area near the turning part of the piston rod 3, reducing the deflection deformation of the piston rod 3 due to its length, avoiding turning vibration or tool deflection, and ensuring the cylindricity and surface accuracy of the outer circle.

[0052] In addition, as the center frame 10 slides, the scraper 5 moves synchronously: The arc-shaped surface of the chip scraper 5 fits into the outer circle of the piston rod 3, further enhancing the rigidity of the piston rod in the turning area.

[0053] The chips produced by the external turning tool 4 are promptly scraped off by the chip scraper blade at the top of the chip scraper 5 to prevent the chips from wrapping around the piston rod 3 and scratching the surface, or from accumulating and affecting the cutting of the external turning tool 4, thus ensuring the continuity and quality of turning.

[0054] After turning is completed, the external finishing tool 4 continues to move along the axial direction until the entire outer cylindrical surface of the piston rod 3 is turned. Then, the machine spindle stops rotating, the tailstock center 7 retracts, the chuck 1 releases, and the machined piston rod 3 is removed, completing one turning cycle.

[0055] The above embodiments are merely one of the implementation methods to achieve the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model.

Claims

1. An auxiliary device for automatic turning of a hydraulic piston rod, characterized in that, include: Guide seat (12) and tail frame bracket (6); The guide seat (12) and the tailstock bracket (6) are both fixed on the operating table; A guide post (9) is inserted between the guide seat (12) and the tail frame bracket (6). The guide seat (12) is fitted with a bearing (13) in the inner hole; The bearing (13) is fixed with a clamping assembly at its end. The clamping assembly is used to connect to the machine tool spindle and clamp one end of the piston rod (3). The other end of the piston rod (3) is inserted into the center hole of the tailstock bracket (6) and is fixed by the tailstock tip (7) of the machine tool; A central frame (10) is fitted onto the guide column (9); A tool follower block (11) is provided on the top of one side of the central frame (10). The tool follower block (11) is used to cooperate with the outer diameter finishing tool (4) of the turret. The tool follower block (11) can drive the central frame (10) to slide along the guide column (9) axially through the movement of the outer diameter finishing tool (4). A chip scraper (5) is provided on the opposite side of the follow-cut stop (11), and the chip scraper (5) is located on the top of the other side of the center frame (10); The center frame (10) has a limiting gap (15) in the middle, and the piston rod (3) overlaps on the limiting gap (15).

2. The auxiliary device for automatic turning of a hydraulic piston rod according to claim 1, characterized in that, The clamping assembly includes a chuck (2) connected to the machine tool spindle; The chuck (2) is axially fixed with a chuck seat (14). The inner diameter of the bearing (13) is engaged and fixed with the chuck seat (14); The chuck (2) end face is provided with multiple sets of jaws (1) in the circumferential direction. All sets of jaws (1) can slide towards the center of the chuck (2) end face to clamp the piston rod (3). The machine tool spindle can drive the chuck (2), chuck seat (14), bearing (13), and piston rod (3) to move synchronously.

3. The auxiliary device for automatic turning of a hydraulic piston rod according to claim 2, characterized in that, The end of the gripper (1) is connected to a pneumatic mechanism.

4. The auxiliary device for automatic turning of a hydraulic piston rod according to claim 2, characterized in that, The chuck (2) is connected to the chuck seat (14) by bolts.

5. The auxiliary device for automatic turning of a hydraulic piston rod according to claim 1, characterized in that, The follower block (11) is connected to the center frame (10) by welding or bolts.

6. The auxiliary device for automatic turning of a hydraulic piston rod according to claim 1, characterized in that, The follower block (11) and the guide post (9) are arranged perpendicularly to each other.

7. The auxiliary device for automatic turning of a hydraulic piston rod according to claim 1, characterized in that, The follower block (11) has a groove, which is inserted into the outer diameter finishing tool (4). When the outer diameter finishing tool (4) is inserted into the groove, the follower block (11) and the center frame (10) can slide along the guide post (9) by moving.

8. The auxiliary device for automatic turning of a hydraulic piston rod according to claim 1, characterized in that, The scraper (5) has a scraping blade on the upper side and an arc-shaped surface on the side near the piston rod (3). The arc-shaped surface cooperates with the piston rod (3) to provide auxiliary support for the piston rod (3).

9. The auxiliary device for automatic turning of a hydraulic piston rod according to claim 1, characterized in that, Rollers (8) are provided at the joint between the center frame (10) and the piston rod (3), and a limiting gap (15) is formed between the two rollers (8).

10. An auxiliary device for automatic turning of a hydraulic piston rod according to claim 1, characterized in that, At least two guide posts (9) are inserted between the guide seat (12) and the tail frame bracket (6); the guide posts (9) are arranged in parallel.

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