Hydraulic telescopic rotary cylinder

Abstract

The present application relates to the technical fields of rotary oil cylinder, and discloses a hydraulic telescopic rotary oil cylinder, which comprises a hydraulic oil cylinder, and further comprises: a shaft core coaxially and fixedly installed on the hydraulic oil cylinder, and oil paths one and two are formed in the shaft core and used for feeding and discharging oil into the hydraulic oil cylinder; a rotating sleeve is arranged outside the shaft core, a rotation-stopping shaft for limiting rotation of the rotating sleeve is fixed on the rotating sleeve, two annular grooves in communication with the oil paths one and two are formed in the inner wall of the rotating sleeve, and an oil hole in communication with the oil paths one and two is further formed in the interior of the rotating sleeve; the shaft core and the rotating sleeve are gap-fitted, and a sealing oil film is formed in the gap. The present application can further reduce the thick degree of hydraulic oil after long-time use by arranging a filter in the oil return channel, thereby prolonging the service life of the hydraulic oil, and the change of the thick degree of the hydraulic oil can be monitored.

Description

Technical Field

[0001] This invention relates to the field of rotary cylinder technology, specifically to a hydraulic telescopic rotary cylinder. Background Technology

[0002] A hydraulic rotary cylinder is a tightly assembled component that uses hydraulics to generate very high torque in a small space and can be easily and precisely controlled. Therefore, rotary cylinders have been successfully applied in almost all fields that require limited rotational motion and high torque.

[0003] Currently, in the rolling process of hot-rolled coilers for strip steel, the expansion and contraction of the sector plate is usually accomplished by rotating hydraulic cylinders pushing and pulling the coil mandrel, driving the inclined slide, connecting plate, and other parts. The rotation is usually achieved by a reducer driving the coil mandrel to rotate, thus completing the rolling process of the hot-rolled coiler.

[0004] For example, Chinese Patent Publication No. CN213144941U discloses a rotary cylinder for a hot rolling coiler. The rotary cylinder uses a clearance fit between the bushing and the rotating shaft to form a high-pressure oil film with sealing capability between the hydraulic oil under oil pressure. However, since impurities or wear particles may be mixed in during the circulation of hydraulic oil due to the external environment or wear, it is necessary to ensure the cleanliness of the oil. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic telescopic rotary cylinder to solve at least one technical problem existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A hydraulic telescopic rotary cylinder includes a hydraulic cylinder and further includes:

[0008] A shaft core is coaxially fixedly mounted on a hydraulic cylinder, and the shaft core is provided with an oil passage one and an oil passage two for oil to enter and exit the hydraulic cylinder;

[0009] A rotating cylinder is sleeved outside the shaft core. A stop shaft is fixed on the rotating cylinder to limit its rotation. Two annular grooves are opened on the inner wall of the rotating cylinder, which are respectively connected to oil passage one and oil passage two. An oil hole is also opened inside the rotating cylinder, which is connected to oil passage one and oil passage two.

[0010] The shaft and the rotating drum are fitted with a clearance, and a sealing oil film is formed in the clearance. The rotating drum is also provided with an oil return channel, and the outer wall of the rotating drum is provided with an oil return hole that communicates with the oil return channel. The oil return channel is connected to the clearance and forms a circulating oil circuit with the outside through the oil return hole.

[0011] A filter element installed in the return oil channel, which can filter the return hydraulic oil in the return oil channel.

[0012] Preferably, the filter element includes a sleeve and a tube that are inserted into each other, and a spring is installed between the sleeve and the tube. The sleeve is fixedly installed on the inner wall of the oil return channel by a sealing ring. The tube has a second chamber and a first chamber, and the second chamber and the first chamber are connected by a spiral flow channel. A through hole is provided at the partition between the second chamber and the first chamber, and a mandrel is rotatably installed in the through hole. A finned wheel is fixed at one end of the mandrel that extends into the second chamber. The hydraulic oil flowing out of the spiral flow channel can impact the fins of the finned wheel in the same rotational direction. A filter screen is installed at the opening of the first chamber. A through hole is provided in the middle of the filter screen. A scraper is installed at one end of the mandrel that passes through the through hole, and the scraper is in contact with the plane of the filter screen.

[0013] Preferably, the inner wall of the sleeve is provided with a sliding groove, the outer wall of the insertion tube is fixed with a slider that is slidably installed in the sliding groove, the inner wall of the sleeve is also provided with an installation hole, and a displacement sensor for monitoring the axial movement distance of the insertion tube is provided in the installation hole.

[0014] Preferably, a filter bag is connected to the filter screen through hole in the first chamber, and the filter bag has a through hole that allows the mandrel to pass through, and the plane of the filter screen is a concave conical surface.

[0015] Preferably, the chamber is a conical cavity, and the opening of the conical cavity faces the filter screen.

[0016] Preferably, the hydraulic cylinder includes a cylinder barrel and a piston rod. The two ends of the cylinder barrel are sealed and installed through a cylinder head and a cylinder bottom, and the shaft is coaxially and fixedly connected to the cylinder bottom. The piston rod passes through the cylinder head and the cylinder bottom and is sealed and slidably connected to the penetration point of the cylinder head and the cylinder bottom. A piston is fixed to the outer wall of the piston rod and slidably installed inside the cylinder barrel. The piston divides the cylinder barrel into two chambers. Oil passage one and oil passage two are respectively connected to the two chambers.

[0017] Preferably, the two ends of the rotating drum are respectively fixed with end caps and bottom caps, and both end caps and bottom caps are designed to be through-sealed with the shaft core.

[0018] Preferably, a rear rod end cap, a rear rod sleeve, and a rear rod bottom cap are rotatably mounted on the end of the piston rod extending from the shaft core, and the rear rod end cap, the rear rod sleeve, and the rear rod bottom cap are fixed to each other by bolts. The rear rod end cap has a guide hole, and a guide rod that slides with the guide hole is fixed on the outer wall of the bottom cap. A sensor cover is also fixed on the outer wall of the rear rod end cap, and a sensor sleeve for installing the sensor is fixed on the outer wall of the bottom cap. The sensor sleeve and the sensor cover are designed to slide with each other.

[0019] Preferably, the oil return channels and oil return holes are designed in multiple sets and are staggered.

[0020] Preferably, the diameter of the shaft is 140mm, and the fit error between the shaft and the rotating drum is 0.025-0.035mm.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] I. This invention filters the returning hydraulic oil by installing a filter element in the return oil channel, which can further reduce the viscosity of the hydraulic oil after long-term use, thereby extending its service life.

[0023] Second, this invention filters hydraulic oil while simultaneously using the flow of hydraulic oil to drive scrapers to clean the filter screen, thereby extending the service life of the filter screen and reducing the frequency of maintenance.

[0024] Third, this invention monitors the distance the insertion tube moves using a displacement sensor. When the distance exceeds a preset value, it indicates that the pressure difference caused by the change in hydraulic oil viscosity has also exceeded the preset value. This can remind maintenance personnel to replace the hydraulic oil, thus achieving the effect of monitoring changes in hydraulic oil viscosity. Furthermore, the cleaning effect of the scraper on the filter screen can further reduce the impact on the subsequent monitoring results of the pressure difference before and after the filter screen, making the monitoring results and data more accurate. Attached Figure Description

[0025] Figure 1 This is a front sectional view of the present invention;

[0026] Figure 2 For the present invention Figure 1 Enlarged view of point A in the image;

[0027] Figure 3 This is an enlarged perspective view of the filter element of the present invention;

[0028] Figure 4 Exploded three-dimensional representation of the filter element of the present invention Figure 1 ;

[0029] Figure 5 This is a front sectional view of the filter element of the present invention;

[0030] Figure 6 This is a cross-sectional view of the sleeve, spring, and insertion tube of the present invention;

[0031] Figure 7 For the present invention Figure 4 A sectional stereoscopic view from a specific perspective;

[0032] Figure 8 Exploded three-dimensional representation of the filter element of the present invention Figure 2 .

[0033] In the diagram: 1. Cylinder barrel; 2. Cylinder head; 3. Cylinder bottom; 4. Piston rod; 5. Piston; 6. Shaft core; 7. Rotary cylinder; 8. End cap; 9. Bottom cap; 10. Rear rod end cap; 11. Rear rod sleeve; 12. Rear rod bottom cap; 13. Guide rod; 14. Sensor sleeve; 15. Sensor cover; 16. Anti-rotation shaft; 17. Oil passage one; 18. Oil passage two; 19. Annular groove; 20. Oil hole; 21. Oil return channel; 23. Oil return hole; 24. Sleeve; 25. Insertion tube; 26. Spring; 27. Filter screen; 28. Spindle; 29. ​​Scraper; 30. Filter bag; 31. Displacement sensor; 32. Chamber one; 33. Chamber two; 34. Spiral flow channel; 35. Slide groove; 36. Slider; 37. Fin wheel. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1 to 8 The present invention provides a hydraulic telescopic rotary cylinder, which includes a hydraulic cylinder and further includes:

[0036] A shaft core 6 is coaxially fixedly mounted on a hydraulic cylinder, and an oil passage 17 and an oil passage 18 are provided inside the shaft core 6 for oil to enter and exit the hydraulic cylinder.

[0037] Rotary cylinder 7 is rotatably sleeved outside shaft core 6. Rotary cylinder 7 is fixed with anti-rotation shaft 16 to limit its rotation. The inner wall of rotary cylinder 7 is provided with two annular grooves 19 that are respectively connected to oil passage 17 and oil passage 28. The interior of rotary cylinder 7 is also provided with oil holes 20 that are connected to oil passage 17 and oil passage 28.

[0038] The shaft core 6 and the rotating drum 7 are in clearance fit, and a sealing oil film is formed in the clearance. The rotating drum 7 is also provided with an oil return channel 21, and the outer wall of the rotating drum 7 is provided with an oil return hole 23 that communicates with the oil return channel 21. The oil return channel 21 is connected to the clearance and forms a circulating oil circuit with the outside through the oil return hole 23.

[0039] A filter element is installed in the return oil channel 21, and the filter element can filter the return hydraulic oil in the return oil channel 21.

[0040] When this hydraulic telescopic rotary cylinder is used in a hot rolling coiler, the hydraulic cylinder is connected to the external oil circuit through the oil hole 20. Through the oil inlet and outlet of oil circuit 17 and oil circuit 28, the axial extension and retraction adjustment can be completed. At the same time, due to the rotational cooperation between the shaft core 6 and the rotating drum 7, it can not only achieve continuous rotation during operation, but also ensure the stable transmission of hydraulic oil in oil circuit 17 and oil circuit 28. Furthermore, the rotating drum 7 can be prevented from rotating under the action of the anti-rotation shaft 16, and the anti-rotation shaft 16 can be connected to other installation parts.

[0041] During use, due to the pressure in oil circuit 17 or oil circuit 18, hydraulic oil will be squeezed into the gap between shaft 6 and drum 7 to form a sealing oil film. Under the action of return oil channel 21 and return oil hole 23, a circulating oil circuit is formed. In this way, the sealing oil film can not only play a sealing role, but also the fluidity of the sealing oil film can carry away the heat generated by friction to play a certain cooling role.

[0042] Furthermore, after prolonged use, hydraulic oil is prone to mixing with foreign solid particles or fine debris generated by friction in the workshop environment. This not only causes the hydraulic oil to thicken but also affects the normal circulation of the oil circuit. Therefore, a filter is installed in the return oil channel 21 to filter the returned hydraulic oil, which can further reduce the viscosity of the hydraulic oil after prolonged use and thus extend its service life.

[0043] In one preferred embodiment, a preferred implementation of the filter element is provided;

[0044] The filter element includes a sleeve 24 and a tube 25 that are inserted into each other, and a spring 26 is installed between the sleeve 24 and the tube 25. The sleeve 24 is fixedly installed on the inner wall of the oil return channel 21 by a sealing ring. The tube 25 has a second chamber 33 and a first chamber 32, and the second chamber 33 and the first chamber 32 are connected by a spiral flow channel 34. A through hole is provided at the partition between the second chamber 33 and the first chamber 32, and a spindle 28 is rotatably installed in the through hole. A finned wheel 37 is fixed at one end of the spindle 28 that extends into the second chamber 33. The hydraulic oil flowing out of the spiral flow channel 34 can impact the fins of the finned wheel 37 in the same rotation direction. A filter screen 27 is installed at the opening of the first chamber 32. A through hole is provided in the middle of the filter screen 27. A scraper 29 is installed at one end of the spindle 28 that passes through the through hole, and the scraper 29 is in contact with the plane of the filter screen 27.

[0045] See Figure 2 Specifically, for the installation location of the filter element, please refer to [link / reference]. Figure 4-5When hydraulic oil flows back in the return oil channel 21, it first passes through the filter screen 27 and enters the chamber 32, then flows through the spiral flow channel 34 into the chamber 32, and finally flows out from the sleeve 24 and the return oil hole 23 to complete the return process.

[0046] The filter screen 27 can filter particulate impurities in the hydraulic oil, and when the hydraulic oil flows through the spiral channel 34, it impacts the fins of the finned wheel 37 in the same direction of rotation. (See details...) Figure 6-7 Therefore, the finned wheel 37 will drive the spindle 28 and scraper 29 to rotate, thereby using the scraper 29 to clean the surface of the filter screen 27 to prevent impurities from clogging the filter screen 27. In this way, while filtering the hydraulic oil, the flow of the hydraulic oil can also drive the scraper 29 to clean the filter screen 27, thereby extending the service life of the filter screen 27 and reducing the number of maintenance.

[0047] In one preferred embodiment, an implementation method for monitoring the viscosity of hydraulic oil is provided, as detailed in [reference needed]. Figure 5 , Figure 6 and Figure 8 ;

[0048] The inner wall of the sleeve 24 is provided with a sliding groove 35, and the outer wall of the insertion tube 25 is fixed with a slider 36 that is slidably installed in the sliding groove 35. The inner wall of the sleeve 24 is also provided with an installation hole, and a displacement sensor 31 for monitoring the axial movement distance of the insertion tube 25 is provided in the installation hole.

[0049] Because impurities can cause hydraulic oil to thicken during use, and oxidation, high-temperature decomposition, or emulsification caused by the introduction of water can also increase the thickening of hydraulic oil. Although the above-mentioned hydraulic oil filtration can avoid the influence of impurities on the hydraulic oil, after long-term use, the hydraulic oil still needs to be replaced when its viscosity exceeds the preset value. Therefore, it is necessary to monitor the change in hydraulic oil viscosity. In this embodiment, a detection method is mainly provided.

[0050] As the viscosity of the hydraulic oil increases, it will affect the filtration effect of the filter screen 27. That is, the pressure drop will increase when passing through the filter screen 27, resulting in an increase in the pressure difference before and after the filter screen 27 (i.e., the filter element). Therefore, under the pressure of the hydraulic oil, it will overcome the elastic force of the spring 26, thereby pushing the filter screen 27 (i.e., the insertion tube 25) to move axially. When the displacement sensor 31 detects that the distance moved by the insertion tube 25 exceeds the preset value, it indicates that the pressure difference caused by the change in the viscosity of the hydraulic oil has also exceeded the preset value. This can remind maintenance personnel to replace the hydraulic oil, thus achieving the effect of monitoring the change in the viscosity of the hydraulic oil.

[0051] The sliding fit between the groove 35 and the slider 36 can limit and guide the insertion tube 25.

[0052] Moreover, it is worth noting that the degree of clogging of filter 27 will affect the pressure difference before and after filter 27. That is, the higher the degree of clogging of filter 27, the greater the error of the pressure difference, and vice versa. Therefore, the self-cleaning process of filter 27 can further reduce the impact on the subsequent pressure difference monitoring results before and after filter 27, making the monitoring results and data more accurate.

[0053] In one preferred embodiment, a filter pocket 30 is connected to the through hole of the filter screen 27 located in the chamber 32, and the filter pocket 30 has a through hole through which the spindle 28 can pass. The plane of the filter screen 27 is a concave conical surface.

[0054] See Figure 4 and Figure 5 The filter bag 30 not only filters the hydraulic oil but also primarily collects particulate impurities. Due to the concave design of the filter screen 27, it guides the hydraulic oil towards the center. This allows the scraper 29 to remove impurities from the filter screen 27, which then flow along with the hydraulic oil into the filter bag 30, preventing further clogging of the filter screen 27. Subsequent maintenance simply requires replacing the filter bag 30. See also... Figure 3-4 The scraper 29 is set in a curved shape, so that during its rotation, it can further promote the flow of particulate impurities into the filter bag 30 and reduce the probability of them remaining at the filter screen 27.

[0055] Furthermore, the filter bag 30 is designed as a bag-shaped structure with a small opening and a large internal space, which can effectively prevent internal impurities from flowing back to the filter screen 27.

[0056] In one preferred embodiment, chamber 32 is a conical cavity with the opening of the conical cavity facing the filter 27.

[0057] See Figure 5 The conical cavity of chamber 32 allows the hydraulic oil to flow faster through the spiral flow channel 34, thereby increasing the rotation speed of the fin wheel 37 and the rotation speed of the scraper 29, improving the cleaning efficiency and effect of the filter screen 27, and further reducing the impact on the subsequent hydraulic oil viscosity monitoring results.

[0058] In one preferred embodiment, the hydraulic cylinder includes a cylinder barrel 1 and a piston rod 4. The two ends of the cylinder barrel 1 are sealed and installed through a cylinder head 2 and a cylinder bottom 3, and the shaft core 6 is coaxially and fixedly connected to the cylinder bottom 3. The piston rod 4 passes through the cylinder head 2 and the cylinder bottom 3 and is sealed and slidably connected to the passage of the cylinder head 2 and the cylinder bottom 3. A piston 5 is fixedly installed on the outer wall of the piston rod 4 and slidably installed inside the cylinder barrel 1. The piston 5 divides the cylinder barrel 1 into two chambers, and oil passage 17 and oil passage 18 are respectively connected to the two chambers.

[0059] By controlling the oil inlet and outlet of the two chambers through oil passage 17 and oil passage 18, the piston 5 can be driven to move axially within the cylinder 1, thus ensuring its stable axial operation.

[0060] In one preferred embodiment, end caps 8 and bottom caps 9 are fixed at both ends of the rotating drum 7, and both end caps 8 and bottom caps 9 are designed to be through-sealed with the shaft core 6.

[0061] In one preferred embodiment, a rear rod end cap 10, a rear rod sleeve 11, and a rear rod bottom cap 12 are rotatably mounted on the end of the piston rod 4 extending from the shaft core 6. The rear rod end cap 10, the rear rod sleeve 11, and the rear rod bottom cap 12 are fixed to each other by bolts. A guide hole is provided on the rear rod end cap 10. A guide rod 13 that slides with the guide hole is fixed on the outer wall of the bottom cap 9. A sensor cover 15 is also fixed on the outer wall of the rear rod end cap 10. A sensor sleeve 14 for installing the sensor is fixed on the outer wall of the bottom cap 9. The sensor sleeve 14 and the sensor cover 15 are designed to slide with each other.

[0062] The sliding fit between the sensor sleeve 14 and the sensor cover 15 allows the sensor inside to monitor the position of the piston rod 4 in real time, which is beneficial for stable operation.

[0063] In one preferred embodiment, multiple sets of oil return channels 21 and oil return holes 23 are designed in a staggered manner.

[0064] See Figure 2 The design of multiple return oil channels 21 also allows for multiple sets of internal filter elements. Utilizing multiple sets of filter elements to monitor changes in hydraulic oil viscosity can make the test results more objective and accurate.

[0065] In one preferred embodiment, the diameter of the shaft core 6 is 140 mm, and the fit error between the shaft core 6 and the rotating drum 7 is 0.025-0.035 mm.

[0066] The standard parts used in this embodiment can be purchased directly from the market, while the non-standard structural parts described in the specification and drawings can be processed directly based on existing technical knowledge without any doubt. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0067] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic telescopic rotary cylinder comprising a hydraulic cylinder, characterized in that: Also include: The shaft core (6) is coaxially fixedly installed on the hydraulic oil cylinder, and oil paths one (17) and two (18) for oil in and out of the hydraulic oil cylinder are arranged in the shaft core (6); The rotating sleeve is arranged outside the shaft core (6), the rotating sleeve (7) is fixed with a rotation stopping shaft (16) for limiting the rotation thereof, the inner wall of the rotating sleeve (7) is provided with two annular grooves (19) respectively communicating with the oil paths one (17) and two (18), and the inside of the rotating sleeve (7) is further provided with an oil hole (20) communicating with the oil paths one (17) and two (18); The shaft core (6) and the rotating sleeve (7) are gap-fitted, a sealed oil film is formed in the gap, the rotating sleeve (7) is further provided with an oil return channel (21), the outer wall of the rotating sleeve (7) is provided with an oil return hole (23) communicating with the oil return channel (21), the oil return channel (21) communicates with the gap and forms a circulating oil path with the outside through the oil return hole (23); The filter is installed in the oil return channel (21), and the filter can filter the returned hydraulic oil in the oil return channel (21); The filter includes a sleeve (24) and a plug (25) which are inserted into each other, a spring (26) is installed between the sleeve (24) and the plug (25), the sleeve (24) is fixedly installed on the inner wall of the oil return channel (21) through a sealing ring, the plug (25) is provided with a chamber two (33) and a chamber one (32), the chamber two (33) and the chamber one (32) communicate through a spiral flow channel (34), a through hole is arranged at the partition between the chamber two (33) and the chamber one (32), a mandrel (28) is rotatably installed in the through hole, the end of the mandrel (28) extending into the chamber two (33) is fixed with a fin wheel (37), the hydraulic oil flowing out of the spiral flow channel (34) can impact the fins of the fin wheel (37) in the same rotation direction, a filter screen (27) is installed at the opening of the chamber one (32), a through hole is arranged in the middle of the filter screen (27), a scraping piece (29) is installed at the end of the mandrel (28) penetrating through the through hole, and the scraping piece (29) is attached to the plane of the filter screen (27); The inner wall of the sleeve (24) is provided with a sliding groove (35), the outer wall of the plug (25) is fixed with a sliding block (36) slidingly installed in the sliding groove (35), the inner wall of the sleeve (24) is further provided with a mounting hole, and a displacement sensor (31) for monitoring the axial movement distance of the plug (25) is arranged in the mounting hole.

2. The hydraulic telescopic rotary cylinder according to claim 1, characterized in that: The filter screen (27) is further connected with a filter bag (30) at the through hole in the chamber one (32), the inside of the filter bag (30) is provided with a through hole for the mandrel (28) to pass through, and the plane of the filter screen (27) is designed as a concave conical surface.

3. The hydraulic retracting rotary cylinder according to claim 1, characterized in that: The chamber one (32) is designed as a conical cavity, and the opening direction of the conical cavity is towards the filter screen (27).

4. The hydraulic retracting rotary cylinder according to claim 1, characterized in that: The hydraulic cylinder comprises a cylinder barrel (1) and a piston rod (4), both ends of the cylinder barrel (1) are sealingly installed through a cylinder head (2) and a cylinder bottom (3), and the shaft core (6) is coaxially and fixedly connected with the cylinder bottom (3); the piston rod (4) penetrates through the cylinder head (2) and the cylinder bottom (3) and is sealingly and slidingly connected with the penetration positions of the cylinder head (2) and the cylinder bottom (3); the outer wall of the piston rod (4) is fixedly connected with a piston (5) which is slidingly installed in the cylinder barrel (1); the piston (5) divides the cylinder barrel (1) into two chambers; and the oil passage one (17) and the oil passage two (18) are respectively communicated with the two chambers.

5. The hydraulic retracting rotary cylinder according to claim 4, characterized in that: Both ends of the rotating drum (7) are fixedly connected with an end cover (8) and a bottom cover (9), and the end cover (8) and the bottom cover (9) are penetratingly and sealingly designed with the shaft core (6).

6. The hydraulic retracting rotary cylinder according to claim 5, characterized in that: The end portion of the piston rod (4) extending out of the shaft core (6) is rotationally installed with a rear rod end cover (10), a rear rod sleeve (11) and a rear rod bottom cover (12) which are sequentially arranged, and the rear rod end cover (10), the rear rod sleeve (11) and the rear rod bottom cover (12) are fixedly connected with each other through bolts; a guide hole is formed in the rear rod end cover (10); the outer wall of the bottom cover (9) is fixedly connected with a guide rod (13) which is slidingly matched with the guide hole; the outer wall of the rear rod end cover (10) is further fixedly connected with a sensor shroud (15); the outer wall of the bottom cover (9) is fixedly connected with a sensor sleeve (14) which is used for installing a sensor; and the sensor sleeve (14) is slidingly matched with the sensor shroud (15).

7. The hydraulic telescopic rotary cylinder according to any of claims 1-6, characterized in that: The oil return channel (21) and the oil return hole (23) are designed with multiple groups and are designed to be staggered.

8. The hydraulic telescopic rotary cylinder according to any of claims 1-6, characterized in that: The diameter of the shaft core (6) is 140mm, and the matching error between the shaft core (6) and the rotating drum (7) is 0.025-0.035mm.

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